High-precision mechanical electric locking oil cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a high-precision mechanical electric locking oil cylinder which comprises a cylinder barrel and a piston rod, the piston rod is inserted into the cylinder barrel and is in sliding fit with the cylinder barrel in the axial direction of the cylinder barrel, and the piston rod is hollow; the nut is connected to the end, located in the cylinder barrel, of the piston rod. The screw rod is inserted into the piston rod, the screw rod is in running fit with the nut, and the screw rod is hollow; the rocker is rotationally arranged in the cylinder barrel, and the rocker is inserted in the screw rod and is in sliding fit with the screw rod in the axial direction of the cylinder barrel; the driving device is arranged at the bottom of the cylinder barrel and used for driving the rocker to rotate; and the sensor assembly is used for oil pressure of the rodless cavity in the cylinder barrel, and the sensor assembly is electrically connected with the driving device. When a hydraulic system loses efficacy, the oil cylinder can automatically carry out mechanical pressure maintaining by monitoring the pressure change of the cavity in real time, and therefore it is guaranteed that the whole filter pressing period is completely carried out.

Description

Technical Field

[0001] This application relates to the field of hydraulic cylinder technology, and in particular to a high-precision mechanical-electric locking cylinder. Background Technology

[0002] A filter press is a device that separates a solid-liquid mixture by passing it through diaphragms such as filter plates, filter elements, and filter screens. It is widely used in industrial filtration sectors such as mining, municipal and rural wastewater treatment, and medical, food, brewing, and scientific research industries. Conventional filter presses typically use hydraulic cylinders and other power components to continuously provide sufficient thrust and maintain pressure within a certain range to compress the filter plates and achieve solid-liquid separation. While conventional pressure maintenance can be achieved through continuous oil supply, the presence of sealing rings and a permissible internal leakage range in the hydraulic cylinder prevents complete pressure loss. Therefore, timely oil filling and pressure maintenance by the hydraulic cylinder is necessary. For absolute safety, a mechanical pressure maintenance mechanism is required to ensure the smooth completion of one cycle of the filtration process in the event of hydraulic system failure. This necessitates a more reliable mechanical pressure maintenance safety lock while maintaining hydraulic pressure.

[0003] Existing hydraulic cylinders with safety locks utilize internally spiraled trapezoidal threads machined in the piston rod's inner bore and externally spiraled trapezoidal threads on the matching screw. When the piston rod extends, it drives the screw to extend simultaneously. Once the preload of the designated filter plate is reached, the cylinder begins to hold pressure. If the hydraulic system fails, a rocker arm is manually operated. The rocker arm and screw are connected by a key. Driven by the trapezoidal threads, the screw slowly contacts the bottom of the cylinder. Upon contact, even if the hydraulic system fails, the trapezoidal threads can withstand the axial force, preventing the piston rod from retracting and ensuring the cylinder can provide the designated thrust without pressure leakage. However, this design has the following drawbacks: 1. Lack of support, resulting in discontinuous operation; When the piston rod extends, its gravity causes a downward horizontal deflection. This can lead to jamming or even seizing when the rocker arm is turned, as the trapezoidal threads are tightly engaged without gaps. 2. Trapezoidal transmission suffers from low transmission efficiency, high processing difficulty, and low precision and lifespan. Mechanical pressure holding requires a rapid response, demanding high transmission efficiency and precision. Furthermore, trapezoidal threads cannot be repaired promptly and on-site when problems occur. 3. The cylinder carries the risk of external leakage and rusting of the cylinder wall and rolling bearings. The filter press is primarily for solid-liquid separation, and water splashing onto the cylinder is unavoidable. This design lacks waterproofing and carries the risk of cylinder leakage. 4. The real-time and rapid nature of mechanical pressure holding cannot be guaranteed. Mechanical pressure holding only activates when the hydraulic system fails. This design uses a manual crank for mechanical pressure holding. When a failure occurs, it's impossible to guarantee a staff member is present, leading to an inability to react promptly. Manual cranking is also physically demanding, resulting in delayed reactions. The crank's rotation distance cannot be accurately determined; it's only known when the crank reaches its bottom, as precise feedback is not always available. Over time, repeated impacts can damage the cylinder bottom. Therefore, it is particularly important to develop a locking cylinder that is reliable, timely, easy to maintain, and highly precise in mechanical pressure holding. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing locking cylinders do not respond in time when the hydraulic system fails, the hydraulic pressure holding and mechanical pressure holding cannot be linked, and the intelligence is not high.

[0005] Therefore, this utility model provides a high-precision mechanical electric locking cylinder. When the hydraulic system fails, this cylinder can automatically maintain mechanical pressure by monitoring the changes in chamber pressure in real time, thereby ensuring the integrity of the entire filter press cycle.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A high-precision mechanical-electric locking cylinder includes,

[0008] Cylinder, and

[0009] A piston rod is inserted into the cylinder and slides along the cylinder axis, and the piston rod is hollow.

[0010] A nut, which is attached to the end of the piston rod located inside the cylinder;

[0011] A screw, which is inserted into the piston rod and rotates with a nut; the screw is hollow.

[0012] A rocker arm is rotatably disposed inside the cylinder and is inserted into the screw and slides along the cylinder axis with the screw.

[0013] A drive unit, which is located at the bottom of the cylinder and is used to drive the rocker arm to rotate;

[0014] A sensor assembly for measuring oil pressure in the rodless chamber of the cylinder, the sensor assembly being electrically connected to the drive unit.

[0015] Furthermore, the cylinder is provided with an oil inlet, which is connected to the rodless chamber, and the sensor assembly includes a pressure measuring connector, which is electrically connected to the drive device.

[0016] Furthermore, the cylinder barrel has a cylinder bottom, and a limiting sleeve is connected to the cylinder bottom. The limiting sleeve is fitted on the outside of the rocker arm, and the rocker arm and the limiting sleeve are rotatably engaged. The sensor assembly includes a pressure sensor, which is used to monitor the position of the screw and is electrically connected to the drive device.

[0017] Furthermore, a through hole is provided on the bottom of the cylinder for the rocker arm to pass through. The rocker arm passes through the through hole and is rotatably connected to the bottom of the cylinder through two bearings. A rotary sealing ring is also provided between the two bearings. The rotary sealing ring is located between the rocker arm and the inner wall of the through hole.

[0018] Furthermore, the inner wall of the through hole is provided with a mounting groove for mounting the bearing, and the limiting sleeve is provided with a limiting boss. The limiting boss is embedded in the mounting groove provided near the inside of the cylinder to axially limit the bearing. A limiting nut is provided on the side of the cylinder bottom away from the inside of the cylinder. The limiting nut is also provided with a limiting boss. The limiting boss on the limiting nut is embedded in the mounting groove provided away from the inside of the cylinder to axially limit the bearing.

[0019] Furthermore, a flange is provided on the inner side of the end of the screw near the bottom of the cylinder, and the rocker arm is inserted into the screw through the flange. A limiting surface is provided on the outer side wall of the rocker arm near the bottom of the cylinder, and the rocker arm slides with the flange along the cylinder axial direction through the limiting surface.

[0020] Furthermore, the flange is connected to the screw via a cylindrical pin.

[0021] Furthermore, a first support ring is provided on the outer side of the screw near the bottom of the cylinder, and the first support ring slides in conjunction with the inner side wall of the cylinder.

[0022] Furthermore, a second support ring is fixedly sleeved on the end of the screw away from the cylinder bottom, and the second support ring slides in conjunction with the inner wall of the piston rod.

[0023] Furthermore, a third support ring is fixedly sleeved on one end of the rocker arm inserted into the screw, and the third support ring slides in conjunction with the inner wall of the screw.

[0024] Furthermore, the surfaces of the support rings are all subjected to copper overlay welding and spraying processes.

[0025] Furthermore, lubrication grooves are machined on the outer side wall of the support ring. The lubrication grooves include intersecting and interconnected annular grooves and longitudinal grooves. The annular grooves are arranged in a ring, and multiple annular grooves are arranged along the axial direction of the cylinder. The longitudinal grooves are arranged along the axial direction of the cylinder, and multiple longitudinal grooves are arranged circumferentially along the support ring.

[0026] Furthermore, a hole sealing ring and a guide ring are provided between the piston and the cylinder. The hole sealing rings are respectively located at both ends near the piston, and the guide rings are located between the hole sealing rings. The hole sealing rings located at both ends of the piston are installed back to back.

[0027] The beneficial effects of this utility model are:

[0028] To address reliability issues such as untimely mechanical pressure holding, this application employs a drive device to precisely drive the rocker arm and screw. When the pressure in the large chamber of the hydraulic cylinder begins to drop, the sensor assembly sends an electrical signal to the servo motor, enabling a precise and timely response. When the hydraulic system recovers, the screw can be reversed to return to its initial state, releasing the mechanical pressure holding and initiating hydraulic pressure holding.

[0029] To address the issues of jamming and stuckness caused by deflection, this application minimizes the impact of screw deflection by adding a support ring and a lubrication groove on it. Furthermore, the support ring surface is treated with copper overlay welding and spraying processes to significantly reduce the impact of friction on stable operation.

[0030] To address the risks of hydraulic cylinder leakage and rust, this application introduces a new waterproof ring sealing configuration that, while ensuring hydraulic stability, also perfectly avoids the impact of moisture and other foreign matter on the hydraulic cylinder. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the structure of the high-precision mechanical electric locking cylinder of this utility model.

[0033] Figure 2 yes Figure 1 Enlarged view of part A of the sealing structure between the piston and the cylinder.

[0034] Figure 3 yes Figure 1 Enlarged view of part B of the rocker arm mounting structure.

[0035] Figure 4 yes Figure 1 Enlarged view of section C of the central support ring structure.

[0036] Figure 5 This is a schematic diagram of the lubrication groove in this utility model.

[0037] Figure 6 This is a schematic diagram of the structure of the oil cylinder in the oil-filling output and pressure-holding state in this utility model.

[0038] Figure 7 This is a schematic diagram of the structure in which the servo motor locks the hydraulic cylinder in this utility model.

[0039] In the diagram: 1. Cylinder; 2. Piston rod; 3. Piston; 4. Screw; 5. Rocker arm; 6. Nut; 7. Cylinder bottom; 8. Guide sleeve; 9. Hole sealing ring; 10. Guide ring; 11. First support ring; 12. Second support ring; 13. Third support ring; 14. Drive unit; 15. Flange; 16. Cylindrical pin; 17. Limiting sleeve; 18. Pressure sensor; 19. Bearing; 20. Rotary sealing ring; 21. Limiting nut; 22. Waterproof ring; 23. Oil inlet; 24. Lubrication groove; 25. Annular groove; 26. Longitudinal groove. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0041] 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," "radial," and "circumferential," etc., indicating 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. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0043] Reference Figure 1 A high-precision mechanical electric locking cylinder includes a cylinder barrel 1, a piston rod 2, a screw 4, a nut 6, a piston 3, a rocker arm 5, a guide sleeve 8, and a drive device 14.

[0044] The cylinder 1 has a cylinder bottom 7 at its bottom. A guide sleeve 8 is fixedly connected to the opening of the cylinder 1. The piston rod 2 passes through the guide sleeve 8 and is inserted into the cylinder 1, coaxially arranged with the cylinder 1. The piston rod 2 slides with the cylinder 1 along its axial direction. A nut 6 is coaxially connected to the end of the piston rod 2 facing the cylinder bottom 7. The nut 6 is annular and has internal threads. The piston 3 is coaxially fitted onto the outside of the nut 6. The piston 3 is located between the nut 6 and the inner wall of the cylinder 1, and slides with the cylinder 1 along its axial direction.

[0045] Reference Figure 2 A hole sealing ring 9 and a guide ring 10 are provided between the piston 3 and the cylinder 1. The hole sealing ring 9 is located at both ends close to the piston 3, and the guide ring 10 is located between the hole sealing rings 9. The hole sealing rings 9 at both ends of the piston 3 are installed back to back.

[0046] The piston rod 2 is hollow, and the screw 4 is coaxially disposed inside the piston rod 2. The screw 4 is threadedly engaged with the nut 6. Furthermore, a ball screw structure can be formed between the screw 4 and the nut 6, and a helical raceway is provided between the screw 4 and the nut 6. Steel balls are placed in the helical raceway to improve the smoothness of the movement of the screw 4.

[0047] The rocker arm 5 is coaxially mounted inside the cylinder 1. A through hole is provided on the cylinder bottom 7 for the rocker arm 5 to pass through. The rocker arm 5 passes through the cylinder bottom 7 and is rotatably connected to the cylinder bottom 7 via a bearing 19. The inner wall of the through hole has a mounting groove for installing the bearing 19. A double bearing 19 support structure exists between the rocker arm 5 and the cylinder bottom 7. Figure 3 As shown, a rotary seal ring 20 is also provided between the two bearings 19 between the rocker arm 5 and the cylinder bottom 7. The bearings 19 can be thrust ball bearings 19.

[0048] The screw 4 is hollow. A flange 15 is provided on the inner side of the end of the screw 4 near the cylinder bottom 7. The flange 15 is connected to the screw 4 through a cylindrical pin 16. The rocker arm 5 is inserted into the screw 4 through the flange 15. The outer wall of the rocker arm 5 near the cylinder bottom 7 is milled on all four sides, so that multiple planes are provided on the outer wall of the rocker arm 5 near the cylinder bottom 7. The rocker arm 5 and the flange 15 are connected by a rectangular fit. The rocker arm 5 and the screw 4 slide along the cylinder 1 axis through the flange 15, so that the two cannot rotate relative to each other.

[0049] It should be noted that, referring to Figure 3 A limiting sleeve 17 is connected to the base. The limiting sleeve 17 is sleeved on the outside of the rocker arm 5. The rocker arm 5 and the limiting sleeve 17 rotate and cooperate, and the rocker arm 5 is restricted to move axially along the cylinder barrel 1. A pressure sensor 18 is provided on the limiting sleeve 17. The pressure sensor 18 is electrically connected to the drive device 14. A limiting boss is provided on the limiting sleeve 17. The limiting boss is embedded in the mounting groove provided near the inside of the cylinder barrel 1 to axially limit the bearing 19. A limiting nut 21 is provided on the side of the cylinder bottom 7 away from the inside of the cylinder barrel 1. A limiting boss is also provided on the limiting nut 21. The limiting boss is embedded in the mounting groove provided away from the inside of the cylinder barrel 1 to axially limit the bearing 19. A waterproof ring 22 is provided between the limiting nut 21 and the cylinder bottom 7.

[0050] The drive device 14 is located on the bottom of the cylinder 7 outside the cylinder barrel 1. The drive device 14 can be a servo motor. The output end of the drive device 14 is connected to the rocker arm 5 to drive the rocker arm 5 to rotate. The rocker arm 5 is inserted into the screw 4, and the rocker arm 5 and the screw 4 slide together along the axial direction of the cylinder barrel 1.

[0051] Furthermore, a sliding ring is fixedly sleeved on one end of the screw 4 near the cylinder bottom 7, and a first support ring 11 is provided on the outside of the sliding ring. The first support ring 11 slides with the inner side wall of the cylinder 1, and a rodless cavity is formed between the sliding ring and the cylinder bottom 7. An oil inlet 23 is provided on the cylinder 1, and the oil inlet 23 communicates with the rodless cavity. A pressure tester can be provided at the oil inlet 23, and the pressure tester can be electrically connected to the drive device 14.

[0052] A second support ring 12 is fixedly sleeved on the end of the screw 4 away from the cylinder bottom 7. The second support ring 12 is slidably engaged with the inner wall of the piston rod 2. A third support ring 13 is fixedly sleeved on the end of the rocker arm 5 inserted into the screw 4. The third support ring 13 is slidably engaged with the inner wall of the screw 4.

[0053] The implementation principle of this application is as follows:

[0054] When the rodless chamber is pressurized, piston rod 2 drives piston 3 and screw 4 to move horizontally to the left. Piston 3 is tightly connected to piston rod 2 via nut 6. A groove is arranged between piston rod 2 and screw 4 to allow rolling steel balls to move, similar to a ball screw. This ensures that while they rotate relative to each other, they cannot move axially. Simultaneously, the rolling steel balls are completely immersed in oil, which lubricates them for smoother rolling. Piston rod 2, piston 3, and screw 4 move synchronously, and the hydraulic cylinder begins to provide thrust. Once the hydraulic cylinder thrust reaches the specified preload of the filter plate, the cylinder begins to fill with oil and maintain pressure, ensuring a stable output of a certain thrust. At this point, the hydraulic cylinder is in a certain state. Figure 6 This is under normal conditions for the hydraulic system;

[0055] When the hydraulic system begins to malfunction, the pressure test connector connected to the rodless chamber begins to depressurize. At this time, an electrical signal is fed back to the servo motor, synchronously driving the rocker arm 5 to rotate. The servo motor and rocker arm 5 are connected by a keyway, preventing them from rotating relative to each other. The rocker arm 5 synchronously drives the screw 4 to rotate. Under the action of the rolling steel balls, the screw 4 begins to move horizontally to the right in a straight line. When the screw 4 reaches the bottom and contacts the limit sleeve 17, the pressure sensor 18 on the limit sleeve 17, which had been at a constant value before contacting the screw 4, begins to fluctuate under the pressure of the right end face of the screw 4. When the pressure sensor 18 exceeds the original set pressure value, it begins to feed back an electrical signal to the servo motor, giving feedback that the screw 4 has reached the bottom. At this time, the servo motor stops rotating. Because the piston rod 2 and the stud are connected by rolling steel balls, the piston rod 2 cannot move backward or horizontally to the right under their action. The state of the cylinder at this time is as follows: Figure 7 As shown, at this time the hydraulic cylinder can provide a stable thrust and maintain this state for a period of time until the filter pressing process ends;

[0056] After the filtration process is complete, the servo motor begins to rotate in the opposite direction, driving screw 4 to move horizontally to the left. When screw 4 contacts piston rod 2, as... Figure 6 Once the hydraulic system is in a stable state, the servo motor can be shut off. After the hydraulic system recovers, pressure can be applied to move piston rod 2 to the right to restore its original state. Figure 1 One filter press cycle is complete.

[0057] To solve the problem of screw 4 in Figure 6 The deflection is affected by the state, at which point the screw 4 and rocker arm 5 have the greatest deflection, and it is also the most difficult time to turn the rocker arm 5. At this time, the servo motor needs to output a large torque to achieve the desired result. Therefore, a first support ring 11, a second support ring 12, and a third support ring 13 are installed at the top of the screw 4 and rocker arm 5 to greatly reduce the deflection. The three support rings mainly perform sliding and rotation. The surface of the support rings is made of copper overlay and spraying process, and lubrication grooves 24 are also machined along the axial direction of the cylinder barrel 1. (Refer to...) Figure 4 , 5 The lubrication groove 24 includes interlocking and interconnected annular grooves 25 and longitudinal grooves 26. The annular grooves 25 are arranged in a ring, and multiple annular grooves 25 are arranged along the axial direction of the cylinder. The longitudinal grooves 26 are arranged along the axial direction of the cylinder, and multiple longitudinal grooves 26 are arranged circumferentially along the support ring. Under the premise of surface-to-surface contact and support, the friction coefficient is greatly reduced, and smooth sliding is ensured while solving the deflection problem. To ensure convenient maintenance, the screw 4 and the flange 15 are connected by a cylindrical pin 16, which greatly reduces the processing and assembly difficulty compared to the conventional flat key connection.

[0058] In terms of sealing configuration, the sealing ring 9 on the piston 3 uses a sealing ring with good pressure holding effect, and is arranged in a back-to-back installation method to ensure that both the large and small chambers can achieve hydraulic pressure holding. At the same time, two thrust ball bearings 19 are arranged on the rocker arm 5 to prevent the rocker arm 5 from rubbing against the cylinder bottom 7, reducing the coefficient of friction and greatly ensuring the smooth operation of the rocker arm 5. A rotary sealing ring 20 is arranged between the two thrust ball bearings 19 to ensure that the oil cylinder will not leak and to prevent foreign objects from entering the oil cylinder. A waterproof ring 22 is arranged on the cylinder bottom 7 to ensure that moisture cannot enter the thrust ball bearings 19 and the oil cylinder, thereby preventing corrosion.

[0059] In summary, this application uses the drive device 14 to precisely drive the rocker arm 5 and the screw 4. When the pressure in the large chamber of the oil cylinder begins to drop, the sensor assembly starts to feed back to the servo motor through an electrical signal, making a precise and timely response. When the hydraulic system recovers, it can also promptly reverse the screw 4 to return to the initial state, releasing the mechanical pressure holding and starting the hydraulic pressure holding.

[0060] This application minimizes the impact of screw 4 deflection by adding a support ring and a lubrication groove 24 on it, and the support ring surface is treated with copper overlay and spraying processes to greatly reduce the impact of friction on smooth operation.

[0061] The newly added waterproof ring 22 sealing configuration in this application not only ensures hydraulic sealing but also perfectly avoids the influence of moisture and other foreign objects on the hydraulic cylinder.

[0062] By setting steel balls between the screw 4 and nut 6 to form a ball screw structure, the transmission efficiency and transmission accuracy are improved, the transmission is more stable, the service life is longer, and the ball screw structure is easy to replace as a whole, making maintenance simple. At the same time, there is no seizing state, so it can well meet the needs of mechanical pressure holding transmission.

[0063] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A high-precision mechanical-electric locking cylinder, characterized in that, include, Cylinder (1), and Piston rod (2), the piston rod (2) is inserted into the cylinder (1) and slides in cooperation with the cylinder (1) along the axial direction of the cylinder (1), the piston rod (2) is hollow; Nut (6), said nut (6) is connected to one end of piston rod (2) located inside cylinder (1); Screw (4), the screw (4) is inserted into the piston rod (2), the screw (4) is rotatably engaged with the nut (6), and the screw (4) is hollow; A rocker arm (5) is rotatably disposed inside a cylinder (1) and is inserted into a screw (4) and slides along the cylinder (1) axially with the screw (4). A drive device (14) is provided at the bottom of the cylinder (1) for driving the rocker arm (5) to rotate; A sensor assembly is used to monitor the oil pressure in the rodless chamber of the cylinder (1), and the sensor assembly is electrically connected to the drive unit (14).

2. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, The cylinder (1) is provided with an oil inlet (23), which is connected to the rodless chamber. The sensor assembly includes a pressure measuring connector, which is electrically connected to the drive device (14).

3. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, The cylinder (1) has a cylinder bottom (7) at the bottom, and a limiting sleeve (17) is connected to the cylinder bottom (7). The limiting sleeve (17) is sleeved on the outside of the rocker arm (5). The rocker arm (5) and the limiting sleeve (17) are rotatably engaged. The sensor assembly includes a pressure sensor (18). The pressure sensor (18) is used to monitor the position of the screw (4). The pressure sensor (18) is electrically connected to the drive device (14).

4. The high-precision mechanical-electric locking cylinder according to claim 3, characterized in that, The cylinder bottom (7) is provided with a through hole for the rocker arm (5) to pass through. The rocker arm (5) passes through the cylinder bottom (7) through the through hole and is rotatably connected to the cylinder bottom (7) through two bearings (19). A rotary sealing ring (20) is also provided between the two bearings (19). The rotary sealing ring (20) is located between the rocker arm (5) and the inner wall of the through hole.

5. The high-precision mechanical-electric locking cylinder according to claim 4, characterized in that, The inner wall of the through hole is provided with a mounting groove for mounting the bearing (19). The limiting sleeve (17) is provided with a limiting boss. The limiting boss is embedded in the mounting groove provided near the inside of the cylinder (1) to axially limit the bearing (19). The bottom of the cylinder (7) is provided with a limiting nut (21) on the side away from the inside of the cylinder (1). The limiting nut (21) is also provided with a limiting boss. The limiting boss on the limiting nut (21) is embedded in the mounting groove provided away from the inside of the cylinder (1) to axially limit the bearing (19).

6. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, A flange (15) is provided on the inner side of the end of the screw (4) near the bottom of the cylinder (7). The rocker arm (5) is inserted into the screw (4) through the flange (15). A limiting surface is provided on the outer side wall of the rocker arm (5) near the bottom of the cylinder (7). The rocker arm (5) slides along the cylinder (1) axially with the flange (15) through the limiting surface.

7. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, A first support ring (11) is provided on the outside of one end of the screw (4) near the bottom of the cylinder (7), and the first support ring (11) slides with the inner side wall of the cylinder (1).

8. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, The screw (4) is externally fixed with a second support ring (12) at one end away from the cylinder bottom (7), and the second support ring (12) slides with the inner wall of the piston rod (2).

9. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, The rocker arm (5) is inserted into the screw (4) and a third support ring (13) is fixedly sleeved on one end. The third support ring (13) slides with the inner wall of the screw (4).

10. The high-precision mechanical-electric locking cylinder according to any one of claims 7-9, characterized in that, The surfaces of the support rings are all treated with copper overlay welding and spraying processes.

11. The high-precision mechanical-electric locking cylinder according to any one of claims 7-9, characterized in that, The outer side wall of the support ring is machined with lubrication grooves (24). The lubrication grooves (24) include intersecting and interconnecting annular grooves (25) and longitudinal grooves (26). The annular grooves (25) are arranged in a ring, and multiple annular grooves (25) are arranged along the axial direction of the cylinder. The longitudinal grooves (26) are arranged along the axial direction of the cylinder, and multiple longitudinal grooves (26) are arranged along the circumference of the support ring.

12. The high-precision mechanical-electric locking cylinder according to claim 1, characterized in that, A hole sealing ring (9) and a guide ring (10) are provided between the piston (3) and the cylinder (1). The hole sealing ring (9) is located at both ends close to the piston (3), and the guide ring (10) is located between the hole sealing rings (9). The hole sealing rings (9) at both ends of the piston (3) are installed back to back.

Images