AGC hydraulic cylinder with external sensor

Abstract

The utility model provides an automatic gain control (AGC) hydraulic cylinder with an external sensor, which relates to the field of rolling mill hydraulic AGC systems, and comprises a cylinder body, a displacement sensor, a connecting plate, a sensor lower cavity, a dust cover, a sensor upper cavity, a communicating cavity and a G1 / 2 screwed plug, the top of the cylinder body is fixedly connected with a cylinder cover, and a piston is arranged between the cylinder body and an inner cavity of the cylinder cover. The top of the piston is detachably connected with a cover plate through a screw. According to the utility model, the displacement sensor is arranged and is installed below the connecting plate through the M18 threads, so that the displacement sensor is convenient to disassemble, the displacement sensor is a main element for detecting and feeding back position signals in the AGC system, and the sensor protection cover is also convenient to disassemble and assemble due to the fact that the connection mode of the sensor protection cover is also a screw; the rubber pad is arranged between the sensor protection cover and the connecting plate and can be used for preventing water vapor and dirt from entering the sensor protection cover, and the solid drying agent is placed in the sensor protection cover and can remove water vapor in air.

Description

Technical Field

[0001] The utility model belongs to the field of hydraulic AGC systems of rolling mills, in particular to an AGC hydraulic cylinder with an external sensor. Background Art

[0002] In the metallurgical industry, with the high-precision hydraulic AGC control system being used more and more widely in steel rolling production lines, the application of hydraulic AGC control technology has attracted more and more attention. The hydraulic thickness control system (AGC) is the core system of modern large-scale plate and strip rolling mills, and the rolling mill servo hydraulic cylinder is the direct actuator in the AGC, working in the closed loop of the AGC system, and is a key link in the loop. Its performance index directly affects the accuracy and dynamic and static quality of the system;

[0003] The AGC hydraulic cylinder of the rolling mill is installed between the bearing seat of the upper support roller and the rolling mill frame. Usually, a displacement sensor is installed on the AGC hydraulic cylinder to provide real-time feedback on the pressure of the AGC hydraulic cylinder and form a closed-loop control with the electro-hydraulic system. The reliability of the AGC hydraulic cylinder directly affects the rolling accuracy of the plate and strip rolling mill. According to the sensor installation method, the AGC hydraulic cylinder can be divided into an AGC hydraulic cylinder with a built-in sensor and an AGC hydraulic cylinder with an external sensor. The built-in sensor is generally installed at the bottom of the cylinder body of the hydraulic cylinder, such as the MTS displacement sensor, which can directly measure the displacement of the piston and convert it into an electrical signal to feed back to the control system. The external sensor is generally installed on the outer surface of the cylinder body, and there are two external sensors on an AGC hydraulic cylinder. The external sensors are arranged symmetrically along the center of the hydraulic cylinder. Compared with the built-in sensor, the installation and maintenance of the external sensor are more convenient, but because it is in an open space and the use occasions of the AGC hydraulic cylinder are usually harsh, this leads to relatively poor reliability of the external sensor, which affects the effective service life of the AGC hydraulic cylinder.

[0004] In summary, the present invention provides an AGC hydraulic cylinder with an external sensor to solve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] An AGC hydraulic cylinder with an external sensor comprises a cylinder body, a displacement sensor, a connecting plate, a sensor lower cavity, a dust cover, a sensor upper cavity, a connecting cavity and a G1 / 2 plug, wherein a cylinder head is fixedly connected to the top of the cylinder body, a piston is arranged between the inner cavities of the cylinder body and the cylinder head, a cover plate is detachably connected to the top of the piston by screws, a pressure plate is detachably connected to the top of the cover plate by screws, external sensor devices are arranged on both sides of the surface of the cylinder body, a sensor protection cover is arranged in the stop below the connecting plate, an M14 bolt is arranged on the surface of the external sensor device, the external sensor device is mounted on the surface of the cylinder body by the M14 bolts, and two external sensor devices are symmetrically distributed along the center line of the cylinder body, the displacement sensor is mounted below the connecting plate by an M18 thread, a mounting key is arranged between the cylinder body and the connecting plate, and is fixed to the external sensor device by the M14 bolt.

[0007] Furthermore, in the utility model, the surface of the sensor protection cover is provided with M6 screws, and the sensor protection cover is installed in the stopper below the connecting plate through the M6 ​​screws, the bottom of the cover plate is installed with a top cap through an M16 screw buckle, the bottom of the top cap is provided with a ball head top cap, the top of the ball head top cap is fixedly connected with a disc spring, the top of the ball head top cap is fixedly connected with a convex spherical pad, the bottom of the convex spherical pad is provided with a concave spherical pad, one side of the convex spherical pad extends to the inner cavity of the concave spherical pad, the bottom of the concave spherical pad is provided with a clamping cover, one side of the clamping cover is provided with an M8 screw, and the clamping cover is installed on the bottom of the cover plate through the M8 screws.

[0008] Furthermore, in the utility model, the bottom of the ball head cap is connected to a movable rod through an M12 thread, the top of the ball head cap is provided with a movable rod, the end of the movable rod away from the ball head cap is connected to a guide sleeve through an M30 thread, the bottom of the movable rod is provided with an M3 copper screw, a thin aluminum pad, a cover plate and a thick aluminum pad, and the thin aluminum pad, the magnetic ring and the thick aluminum pad are installed under the movable rod through the M3 copper screw, the inner cavity of the movable rod is provided with a accommodating hole, the displacement sensor is located in the inner cavity of the accommodating hole, the surface of the movable rod is provided with a shell, and the movable rod is slidably connected to the inner cavity of the shell, the stopper on the upper end of the connecting plate is provided with an M10 screw, the shell is installed in the stopper on the upper end of the connecting plate through the M10 screw, the bottom of the shell is provided with a guide sleeve, the guide sleeve and the surface of the shell are clearance-fitted, and the material of the guide sleeve is aluminum bronze.

[0009] Furthermore, in the utility model, a sealing sleeve is connected to the top of the shell through an M50 thread, a static sealing groove is provided at the upper end of the shell, and a square ring is placed in the static sealing groove, the square ring forms an end face seal with the shell and the sealing sleeve, the inner cavity of the sealing sleeve is provided with a dustproof groove and a sealing groove, and a skeleton dustproof is installed in the dustproof groove, and a Y-ring is installed in the sealing groove, a static sealing groove is provided at the bottom of the shell, and an O-ring is provided in the static sealing groove, and the shell, the sealing sleeve and the connecting plate form a sealed space under the action of the Y-ring, the skeleton dustproof and the connecting plate respectively.

[0010] Furthermore, in the utility model, a rubber pad is arranged between the sensor protection cover and the connecting plate, a protrusion is arranged at the lower end of the sensor protection cover, a G1 / 2 internal thread is arranged at the protrusion, and a pagoda joint is connected to the G1 / 2 thread, a rubber protection tube is installed on the serrated side of the pagoda joint, a protrusion is arranged on the outer side of the sensor protection cover, a G1 / 2 internal thread is arranged at the protrusion, and a G1 / 2 plug is connected to the side of the sensor protection cover through the G1 / 2 thread.

[0011] Furthermore, in the utility model, a Φ50 throat clamp is provided on the upper end of the dust cover, and the dust cover is installed on the outside of the clamping cover through the Φ50 throat clamp, and a Φ60 throat clamp is provided on the lower side of the dust cover, and is installed on the outside of the sealing sleeve through the Φ60 throat clamp.

[0012] Beneficial effects: The utility model has the following beneficial effects:

[0013] The utility model is used to form a device body by arranging a cylinder body, a cylinder head, a piston, a cover plate, a pressure plate, an external sensor device, a sensor protection cover, a displacement sensor, a connecting plate and a mounting key. The displacement sensor is installed below the connecting plate through an M18 thread, so it is convenient to disassemble. The displacement sensor is a main component for detecting and feeding back position signals in the AGC system. The connection method of the sensor protection cover is also screws, so it is also convenient to disassemble and install. Since a rubber pad is provided between the sensor protection cover and the connecting plate, it can be used to prevent water vapor and dirt from entering the interior of the sensor protection cover, and a solid desiccant is placed inside the sensor protection cover to remove water vapor in the air in the space. A rubber protection tube is installed on the serrated side of the pagoda joint to protect the cable of the displacement sensor. While ensuring convenient disassembly and maintenance, it can work reliably in complex and harsh working conditions and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a main schematic diagram of the utility model;

[0015] Figure 2 It is a top view schematic diagram of the utility model;

[0016] Figure 3It is a cross-sectional view of the external sensor of the utility model;

[0017] Figure 4 It is the front view of the external sensor of the utility model.

[0018] In the figure:

[0019] 1. Cylinder body; 2. Cylinder head; 3. Piston; 4. Cover plate; 5. Pressure plate; 6. External sensor device; 7. Sensor protection cover; 8. Displacement sensor; 9. Connecting plate; 10. M14 bolt; 11. Mounting key; 12. M3 copper screw; 13. Thin aluminum pad; 14. Magnetic ring; 15. Thick aluminum pad; 16. Guide sleeve; 17. Shell; 18. Active rod; 19. Sealing sleeve; 20. Y-ring; 21. Frame dustproof; 22. Ball head cap; 23. Concave spherical surface Gasket; 24, convex spherical gasket; 25, pagoda joint; 26, M6 screw; 27, rubber gasket; 28, O-ring; 29, sensor lower chamber; 30, connecting pipe; 31, square ring; 32, Φ60 throat clamp; 33, dust cover; 34, Φ50 throat clamp; 35, disc spring; 36, clamping cover; 37, sensor upper chamber; 38, M8 screw; 39, top cap; 40, connecting chamber; 41, G1 / 2 plug; 42, M10 screw; 43, G1 / 4 plug. DETAILED DESCRIPTION

[0020] In order to better understand the technical content of the utility model, specific embodiments are cited and described as follows in conjunction with the accompanying drawings. In this disclosure, various aspects of the utility model are described with reference to the accompanying drawings, and many illustrative embodiments are shown in the accompanying drawings. The embodiments of the present disclosure are not necessarily defined to include all aspects of the utility model. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the utility model are not limited to any implementation method. In addition, some aspects disclosed in the utility model can be used alone, or used in any appropriate combination with other aspects disclosed in the utility model.

[0021] Example 1

[0022] like Figure 1-4As shown, it is the first embodiment of the utility model, which provides an AGC hydraulic cylinder with an external sensor, including a cylinder body 1, a displacement sensor 8, a connecting plate 9, a sensor lower chamber 29, a dust cover 33, a sensor upper chamber 37, a connecting chamber 40 and a G1 / 2 plug 41. The top of the cylinder body 1 is fixedly connected to a cylinder head 2, a piston 3 is arranged between the inner chambers of the cylinder body 1 and the cylinder head 2, the top of the piston 3 is detachably connected to a cover plate 4 by screws, and the top of the cover plate 4 is detachably connected to a pressure plate 5 by screws. The surface of the cylinder body 1 External sensor devices 6 are provided on both sides of the surface, a sensor protection cover 7 is provided in the stopper below the connecting plate 9, an M14 bolt 10 is provided on the surface of the external sensor device 6, the external sensor device 6 is installed on the surface of the cylinder body 1 through the M14 bolt 10, and the two external sensor devices 6 are symmetrically distributed along the center line of the cylinder body 1, the displacement sensor 8 is installed below the connecting plate 9 through an M18 thread, and an installation key 11 is provided between the cylinder body 1 and the connecting plate 9, and is fixed to the external sensor device 6 through the M14 bolt.

[0023] like Figure 1-4 As shown, the cylinder body 1, the cylinder head 2, the piston 3, the cover plate 4, the pressure plate 5, the external sensor device 6, the sensor protection cover 7, the displacement sensor 8, the connecting plate 9 and the installation key 11 are used to constitute the main body of the equipment. The displacement sensor 8 is installed under the connecting plate 9 through the M18 thread, so it is relatively convenient to disassemble. The displacement sensor 8 is the main component for detecting and feeding back the position signal in the AGC system. The connection method of the sensor protection cover 7 is also screws, so it is also convenient to disassemble and install. Since a rubber pad 27 is provided between the sensor protection cover 7 and the connecting plate 9, it can be used to prevent water vapor and dirt from entering the interior of the sensor protection cover 7, and a solid desiccant is placed inside the sensor protection cover 7, which can be used to remove water vapor in the air in the space. A rubber protective tube is installed on the serrated side of the pagoda joint 25 to protect the cable of the displacement sensor 8. While ensuring easy disassembly and maintenance, it can work reliably in complex and harsh working conditions and has a long service life.

[0024] Example 2

[0025] Reference Figure 3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0026] In this embodiment, the surface of the sensor protection cover 7 is provided with M6 screws 26, and the sensor protection cover 7 is installed in the stopper below the connecting plate 9 through the M6 ​​screws 26, and the bottom of the cover plate 4 is installed with a top cap 39 through an M16 screw buckle, and the bottom of the top cap 39 is provided with a ball head top cap 22, and the top of the ball head top cap 22 is fixedly connected with a disc spring 35, and the top of the ball head top cap 22 is fixedly connected with a convex spherical pad 24, and the bottom of the convex spherical pad 24 is provided with a concave spherical pad 23, and one side of the convex spherical pad 24 extends to the inner cavity of the concave spherical pad 23, and the bottom of the concave spherical pad 23 is provided with a clamping cover 36, and one side of the clamping cover 36 is provided with an M8 screw 38, and the clamping cover 36 is installed on the bottom of the cover plate 4 through the M8 screw 38.

[0027] The bottom of the ball head cap 22 is connected to the movable rod 18 through an M12 thread, the top of the ball head cap 22 is provided with the movable rod 18, the end of the movable rod 18 away from the ball head cap 22 is connected to the guide sleeve 16 through an M30 thread, the bottom of the movable rod 18 is provided with an M3 copper screw 12, a thin aluminum pad 13, a cover plate 4 and a thick aluminum pad 15, and the thin aluminum pad 13, the magnetic ring 14 and the thick aluminum pad 15 are installed below the movable rod 18 through the M3 copper screw 12, and the inner cavity of the movable rod 18 An accommodating hole is opened, and the displacement sensor 8 is located in the inner cavity of the accommodating hole. A shell 17 is arranged on the surface of the movable rod 18, and the movable rod 18 is slidably connected to the inner cavity of the shell 17. An M10 screw 42 is arranged in the stopper at the upper end of the connecting plate 9, and the shell 17 is installed in the stopper at the upper end of the connecting plate 9 through the M10 screw 42. A guide sleeve 16 is arranged at the bottom of the shell 17, and a clearance fit is adopted between the guide sleeve 16 and the surface of the shell 17, and the material of the guide sleeve 16 is aluminum bronze.

[0028] like Figure 2 As shown, the inner and outer surfaces of the housing 17 are processed by QPQ process, and the inner surface finish is less than 0.8um. ​​The ball head cap 22 is connected to the movable rod 18 by M12 thread. The movable rod 18 extends or retracts with the ball head cap 22, so the installation and disassembly of the movable rod 18 are relatively convenient. The M3 copper screw 12 is used to install the thin aluminum pad 13, the magnetic ring 14 and the thick aluminum pad 15 under the movable rod 18.

[0029] Example 3

[0030] Reference Figure 3 , which is the third embodiment of the utility model, and this embodiment is based on the previous two embodiments.

[0031] In this embodiment, the top of the outer shell 17 is connected to the sealing sleeve 19 through an M50 thread, the upper end of the outer shell 17 is provided with a static sealing groove, and a square ring 31 is placed in the static sealing groove, the square ring 31 forms an end face seal with the outer shell 17 and the sealing sleeve 19, the inner cavity of the sealing sleeve 19 is provided with a dustproof groove and a sealing groove, and the dustproof groove is provided with a skeleton dustproof 21, and the sealing groove is provided with a Y-ring 20, a static sealing groove is provided at the bottom of the outer shell 17, and an O-ring 28 is provided in the static sealing groove, and the outer shell 17, the sealing sleeve 19 and the connecting plate 9 respectively form a sealed space under the action of the Y-ring 20, the skeleton dustproof 21 and the connecting plate 9.

[0032] A rubber pad 27 is arranged between the sensor protection cover 7 and the connecting plate 9, a protrusion is arranged at the lower end of the sensor protection cover 7, a G1 / 2 internal thread is arranged at the protrusion, and a pagoda joint 25 is connected to the G1 / 2 thread, a rubber protection tube is installed on the serrated side of the pagoda joint 25, a protrusion is arranged on the outer side of the sensor protection cover 7, a G1 / 2 internal thread is arranged at the protrusion, and a G1 / 2 wire plug is connected to the side of the sensor protection cover 7 through the G1 / 2 thread.

[0033] A Φ50 throat hoop 34 is provided at the upper end of the dust cover 33, and the dust cover 33 is installed on the outside of the clamping cover 36 through the Φ50 throat hoop 34. A Φ60 throat hoop 32 is provided on the lower side of the dust cover 33, and is installed on the outside of the sealing sleeve 19 through the Φ60 throat hoop 32.

[0034] like Figure 3 As shown, the square ring 31 forms an end face seal with the housing 17 and the sealing sleeve 19 to prevent water vapor and oxidized slag from entering the internal cavity of the sensor. The skeleton dustproof 21 is used to scrape off the dirt on the outer surface of the movable rod 18 and prevent the dirt from invading the interior of the sensor device. The Y-ring 20 is used to seal the internal cavity of the sensor. The O-ring 28 is used to prevent water vapor and oxidized slag from entering the sensor cavity along the bottom of the housing 17, while ensuring that the hydraulic oil in the sensor cavity does not flow out. The housing 17 and the sealing sleeve 19 and the connecting plate 9 form a sealed space under the action of the Y-ring 20, the square ring 31 and the connecting plate 9, respectively, and the hydraulic oil is injected into the sealed space through the G1 / 4 oil port. After the hydraulic oil fills the entire sealed space, use a G1 / 4 wire plug 43 to block the oil port to prevent water vapor from entering. The sealed space is composed of a sensor lower chamber 29, a sensor upper chamber 37 and a connecting chamber 40. When the movable rod 18 is extended, the hydraulic oil enters the sensor lower chamber 29 from the sensor upper chamber 37 through the connecting chamber 40. When the movable rod 18 is retracted, the hydraulic oil flows from the sensor lower chamber 29 through the connecting chamber 40 into the sensor upper chamber 37. Filling the internal space of the external sensor device 6 with hydraulic oil can effectively ensure the lubrication performance of the internal sliding parts, while removing the air inside the external sensor device 6 to ensure that there is no water vapor inside the external sensor device 6.

[0035] When in use, the cylinder body 1, the cylinder head 2, the piston 3, the cover plate 4, the pressure plate 5, the external sensor device 6, the sensor protection cover 7, the displacement sensor 8, the connecting plate 9 and the installation key 11 constitute the main body of the equipment. The displacement sensor 8 is the main component for detecting and feeding back the position signal in the AGC system. The displacement sensor 8 is installed under the connecting plate 9 through the M18 thread, so it is easy to disassemble. The connection method of the sensor protection cover 7 is also screws, so it is also easy to disassemble and install. Since a rubber pad 27 is provided between the sensor protection cover 7 and the connecting plate 9, it can be used to prevent water vapor and dirt from entering the sensor protection cover. The inside of the cover 7, and the inside of the sensor protection cover 7 is provided with a solid desiccant, which can be used to remove water vapor in the air in the space. The serrated side of the pagoda joint 25 is provided with a rubber protection tube to protect the cable of the displacement sensor 8. The ball head cap 22 is connected to the movable rod 18 through an M12 thread. The movable rod 18 moves with the extension or retraction of the ball head cap 22, so the installation and removal of the movable rod 18 are relatively convenient. The M3 copper screw 12 is used to install the thin aluminum pad 13, the magnetic ring 14 and the thick aluminum pad 15 under the movable rod 18. The square ring 31 forms an end face seal with the housing 17 and the sealing sleeve 19 to prevent water vapor and oxygen. The skeleton dustproof 21 is used to scrape off the dirt on the outer surface of the movable rod 18 and prevent dirt from invading the interior of the sensor device. The Y-ring 20 is used to seal the internal cavity of the sensor. The O-ring 28 is used to prevent water vapor and oxide slag from entering the sensor cavity along the bottom of the shell 17, while ensuring that the hydraulic oil in the sensor cavity does not flow out. The shell 17, the sealing sleeve 19 and the connecting plate 9 form a sealed space under the action of the Y-ring 20, the square ring 31 and the connecting plate 9 respectively. The hydraulic oil is injected into the sealed space through the G1 / 4 oil port. After the hydraulic oil fills the entire sealed space, use The G1 / 4 thread plug 43 blocks the oil port to prevent water vapor from entering. The sealed space is composed of the sensor lower chamber 29, the sensor upper chamber 37 and the connecting chamber 40. When the movable rod 18 is extended, the hydraulic oil enters the sensor lower chamber 29 from the sensor upper chamber 37 through the connecting chamber 40. When the movable rod 18 is retracted, the hydraulic oil flows from the sensor lower chamber 29 through the connecting chamber 40 into the sensor upper chamber 37. Filling the internal space of the external sensor device 6 with hydraulic oil can effectively ensure the lubrication performance of the internal sliding parts, while at the same time eliminating the air inside the external sensor device 6 to ensure that there is no water vapor inside the external sensor device 6.

[0036] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented through simple programming by technicians in this field, which is common knowledge in the field. This application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0037] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An AGC hydraulic cylinder with an external sensor, comprising a cylinder body (1), a displacement sensor (8), a connecting plate (9), a sensor lower chamber (29), a dust cover (33), a sensor upper chamber (37), a connecting chamber (40) and a G1 / 2 plug (41), characterized in that: The top of the cylinder body (1) is fixedly connected to a cylinder head (2), a piston (3) is arranged between the inner cavities of the cylinder body (1) and the cylinder head (2), the top of the piston (3) is detachably connected to a cover plate (4) by screws, the top of the cover plate (4) is detachably connected to a pressure plate (5) by screws, both sides of the surface of the cylinder body (1) are provided with external sensor devices (6), a sensor protection cover (7) is arranged in a stopper below the connecting plate (9), an M14 bolt (10) is arranged on the surface of the external sensor device (6), the external sensor device (6) is mounted on the surface of the cylinder body (1) by the M14 bolt (10), and the two external sensor devices (6) are symmetrically distributed along the center line of the cylinder body (1), the displacement sensor (8) is mounted below the connecting plate (9) by an M18 thread, and a mounting key (11) is arranged between the cylinder body (1) and the connecting plate (9) and is fixed to the external sensor device (6) by the M14 bolt.

2. The AGC hydraulic cylinder with an external sensor as claimed in claim 1, characterized in that: The surface of the sensor protection cover (7) is provided with M6 screws (26), and the sensor protection cover (7) is installed in the stopper below the connecting plate (9) through the M6 ​​screws (26); the bottom of the cover plate (4) is installed with a top cap (39) through an M16 screw; the bottom of the top cap (39) is provided with a ball head top cap (22); the top of the ball head top cap (22) is fixedly connected to a disc spring (35); the top of the ball head top cap (22) is fixedly connected to a convex spherical pad (24); the bottom of the convex spherical pad (24) is provided with a concave spherical pad (23); one side of the convex spherical pad (24) extends to the inner cavity of the concave spherical pad (23); the bottom of the concave spherical pad (23) is provided with a clamping cover (36); one side of the clamping cover (36) is provided with an M8 screw (38); the clamping cover (36) is installed on the bottom of the cover plate (4) through the M8 screw (38).

3. The AGC hydraulic cylinder with an external sensor as claimed in claim 2, characterized in that: The bottom of the ball head cap (22) is connected to a movable rod (18) via an M12 thread, the top of the ball head cap (22) is provided with a movable rod (18), one end of the movable rod (18) away from the ball head cap (22) is connected to a guide sleeve (16) via an M30 thread, the bottom of the movable rod (18) is provided with an M3 copper screw (12), a thin aluminum washer (13), a cover plate (4) and a thick aluminum washer (15), and the thin aluminum washer (13), the magnetic ring (14) and the thick aluminum washer (15) are installed below the movable rod (18) via the M3 copper screw (12), and the inner portion of the movable rod (18) is provided with a guide sleeve (16) via an M30 thread. The cavity is provided with a receiving hole, the displacement sensor (8) is located in the inner cavity of the receiving hole, the surface of the movable rod (18) is provided with a shell (17), and the movable rod (18) is slidably connected to the inner cavity of the shell (17), an M10 screw (42) is provided in the stopper at the upper end of the connecting plate (9), and the shell (17) is installed in the stopper at the upper end of the connecting plate (9) through the M10 screw (42), and a guide sleeve (16) is provided at the bottom of the shell (17), and a clearance fit is adopted between the guide sleeve (16) and the surface of the shell (17), and the material of the guide sleeve (16) is aluminum bronze.

4. The AGC hydraulic cylinder with an external sensor as claimed in claim 3, characterized in that: The top of the housing (17) is connected to a sealing sleeve (19) via an M50 thread. A static sealing groove is provided at the upper end of the housing (17), and a square ring (31) is placed in the static sealing groove. The square ring (31) forms an end face seal with the housing (17) and the sealing sleeve (19). The inner cavity of the sealing sleeve (19) is provided with a dustproof groove and a sealing groove, and a skeleton dustproof (21) is installed in the dustproof groove, and a Y-shaped ring (20) is installed in the sealing groove. A static sealing groove is provided at the bottom of the housing (17), and an O-shaped ring (28) is arranged in the static sealing groove. The housing (17), the sealing sleeve (19) and the connecting plate (9) form a sealed space under the action of the Y-shaped ring (20), the skeleton dustproof (21) and the connecting plate (9), respectively.

5. The AGC hydraulic cylinder with an external sensor as claimed in claim 1, characterized in that: A rubber pad (27) is provided between the sensor protection cover (7) and the connecting plate (9); a protrusion is provided at the lower end of the sensor protection cover (7); a G1 / 2 internal thread is provided at the protrusion; and a pagoda connector (25) is connected to the G1 / 2 thread; a rubber protection tube is provided on the serrated side of the pagoda connector (25); a protrusion is provided on the outer side surface of the sensor protection cover (7); and a G1 / 2 internal thread is provided at the protrusion; and a G1 / 2 plug is connected to the side surface of the sensor protection cover (7) through the G1 / 2 thread.

6. The AGC hydraulic cylinder with an external sensor as claimed in claim 1, characterized in that: A Φ50 throat hoop (34) is provided at the upper end of the dust cover (33), and the dust cover (33) is installed on the outer side of the clamping cover (36) through the Φ50 throat hoop (34); a Φ60 throat hoop (32) is provided on the lower side of the dust cover (33), and the dust cover (33) is installed on the outer side of the sealing sleeve (19) through the Φ60 throat hoop (32).

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