Built-in hydraulic cylinder of bidirectional buffer sensor
By incorporating magnetostrictive displacement sensor and bidirectional buffer sleeve in the hydraulic cylinder, the problem of insufficient buffering effect of traditional hydraulic cylinders under high speed or heavy load conditions is solved, and a more stable and high-precision hydraulic cylinder operation is achieved.
Patent Information
- Application Number
- CN202421369600.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-17
AI Technical Summary
Traditional hydraulic cylinders cannot provide sufficient bidirectional buffering effect under high speed or heavy load conditions, resulting in large impact and vibration, affecting service life and working stability. At the same time, the external displacement sensor is easily disturbed by external environment, and has a complex structure and is difficult to install and maintain.
A two-way buffer sensor is designed with a built-in hydraulic cylinder, which adopts a built-in magnetostrictive displacement sensor, which can precisely adjust the buffer pressure through a two-way buffer sleeve, reduce impact and vibration, and prevent dust and high-temperature seals from burning through dust covers and exhaust screws.
It realizes stable operation of hydraulic cylinders under high speed or heavy load conditions, reduces impact and vibration, extends service life, and avoids external environmental interference through built-in sensors, improves measurement accuracy and long life of sensors.
Smart Images
Figure CN222863734U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a built-in bidirectional buffer sensor. Background Art
[0002] In the modern industrial field, hydraulic cylinders are important actuators that convert hydraulic energy into mechanical energy. They have a very wide range of applications. With their simple structure, reliable operation, and smooth movement, hydraulic cylinders have become indispensable power components in machine tools, metallurgy, mining, shipbuilding and other industries. However, with the continuous improvement of the level of industrial automation, the performance requirements for hydraulic cylinders are becoming increasingly stringent, especially in terms of the accuracy and speed of data transmission, as well as the stability and safety of equipment.
[0003] In the prior art, the design of traditional hydraulic cylinders adopts simple buffer structures for bidirectional buffering. These structures often cannot provide sufficient buffering effect when dealing with high-speed or heavy-load conditions, resulting in large impact and vibration, which in turn affects the service life and working stability of the hydraulic cylinder. At the same time, the external displacement sensor is easily affected by mechanical friction, collision, and external environmental factors such as temperature and humidity. Not only is the structure complex, installation and maintenance difficult, but also there are disadvantages such as difficulty in ensuring measurement accuracy and easy damage. Utility Model Content
[0004] The purpose of the utility model is to solve the problem in the prior art that the design of traditional hydraulic cylinders adopts simple buffer structures in bidirectional buffering. These structures often cannot provide sufficient buffering effect when dealing with high-speed or heavy-load conditions, resulting in large impact and vibration, which in turn affects the service life and working stability of the hydraulic cylinder. At the same time, the external displacement sensor is easily disturbed by mechanical friction, collision, and external environmental factors such as temperature and humidity. Not only is the structure complex, installation and maintenance difficult, but also there are shortcomings such as difficulty in ensuring measurement accuracy and easy damage. A bidirectional buffer sensor is proposed with a built-in hydraulic cylinder.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a bidirectional buffer sensor with a built-in hydraulic cylinder, including a piston rod, a cylinder head is provided on the outer surface of the piston rod, a cylinder assembly is provided on the outer surface of the cylinder head, a first buffer sleeve is provided on the outer surface of the piston rod, a piston is provided on the outer surface of the first buffer sleeve, a first cylindrical pin is provided on the outer surface of the piston, a second buffer sleeve is provided on the inner surface wall of the piston rod, a supporting positioning nut is provided on the outer surface of the second buffer sleeve, a second cylindrical pin is provided on the outer surface of the second buffer sleeve, a cylinder bottom is provided on the outer surface of the cylinder head, and a hexagon socket screw is provided on the outer surface of the cylinder bottom.
[0006] Preferably, a dust cover is provided on the outer surface of the magnetostrictive displacement sensor, a fastening screw is provided on the outer surface of the dust cover, a cable is provided on the inner surface wall of the outer surface of the dust cover, and a cap is provided on the outer surface of the dust cover.
[0007] Preferably, a magnetostrictive displacement sensor is provided on the inner surface wall of the dust cover, an O-ring is provided on the outer surface of the magnetostrictive displacement sensor, and an elastic retaining ring for a hole is provided on the outer surface of the O-ring.
[0008] Preferably, the outer surface of the hole elastic retaining ring is provided with a magnetic isolation sleeve, and the outer surface of the magnetic isolation sleeve is provided with a magnetic ring.
[0009] Preferably, a first O-ring is disposed on the outer surface of the magnetic ring, a steel ball is disposed on the outer surface of the first O-ring, and an exhaust screw is disposed on the inner surface wall of the steel ball.
[0010] Preferably, a valve seat is provided on the inner surface wall of the steel ball, and a valve needle is provided on the inner surface wall of the valve seat.
[0011] Preferably, a polytetrafluoroethylene retaining ring is disposed on the outer surface of the valve needle, and a second O-ring is disposed on the outer surface of the polytetrafluoroethylene retaining ring.
[0012] Compared with the prior art, the advantages and positive effects of the utility model are:
[0013] 1. In the utility model, the rod chamber and the rodless chamber of the hydraulic cylinder adopt bidirectional buffering to precisely adjust the buffering pressure, without buffering impact vibration, the buffering structure is simple, and it is convenient to process and install. In addition, the piston rod adopts a built-in magnetostrictive digital measurement displacement sensor. There is no friction and collision during installation and use. The structure is simple. Through the non-contact displacement sensor, accurate measurement can be made, the displacement can be adjusted as needed, and the service life is long.
[0014] 2. In the utility model, both the rod chamber and the rodless chamber of the oil cylinder adopt exhaust valves to exhaust the air in the oil cylinder to prevent the high-temperature seal from burning during movement. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A partial structural diagram of a bidirectional buffer sensor with a built-in hydraulic cylinder is provided for the utility model;
[0016] Figure 2 A schematic diagram of a bidirectional buffer sensor with a built-in hydraulic cylinder is provided for the utility model;
[0017] Figure 3 Another structural schematic diagram of a bidirectional buffer sensor with a built-in hydraulic cylinder is provided for the utility model;
[0018] Figure 4The utility model provides a structural enlarged diagram of a bidirectional buffer sensor with a built-in hydraulic cylinder.
[0019] Legend: 1. Piston rod; 2. Cylinder head; 3. Cylinder assembly; 4. First buffer sleeve; 5. Piston; 6. First cylindrical pin; 7. Second buffer sleeve; 8. Support positioning nut; 9. Second cylindrical pin; 10. Cylinder bottom; 11. Hexagon socket screw; 12. Dust cover; 13. Fastening screw; 14. Cable; 15. Cap; 16. Magnetostrictive displacement sensor; 17. O-ring; 18. Elastic retaining ring for hole; 19. Magnetic isolation sleeve; 20. Magnetic ring; 21. First O-ring; 22. Steel ball; 23. Exhaust screw; 24. Valve seat; 25. Valve needle; 26. PTFE retaining ring; 27. Second O-ring. DETAILED DESCRIPTION
[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.
[0022] Embodiment 1, as Figure 1-Figure 4 As shown, the utility model provides a bidirectional buffer sensor built-in hydraulic cylinder, including a piston rod 1, a cylinder head 2 is provided on the outer surface of the piston rod 1, a cylinder assembly 3 is provided on the outer surface of the cylinder head 2, a first buffer sleeve 4 is provided on the outer surface of the piston rod 1, a piston 5 is provided on the outer surface of the first buffer sleeve 4, a first cylindrical pin 6 is provided on the outer surface of the first buffer sleeve 4, a second buffer sleeve 7 is provided on the outer surface of the piston rod 1, a supporting positioning nut 8 is provided on the outer surface of the second buffer sleeve 7, a second cylindrical pin 9 is provided on the outer surface of the second buffer sleeve 7, a cylinder bottom 10 is provided on the outer surface of the cylinder head 2, and a cylinder bottom 10 is provided on the outer surface of the cylinder head 2. 0 is provided with a hexagon socket screw 11 on the outer surface of the cylinder head 2, a dust cover 12 is provided with a fastening screw 13 on the outer surface of the dust cover 12, a cable 14 is provided on the inner surface wall of the outer surface of the dust cover 12, a cap 15 is provided on the outer surface of the dust cover 12, a magnetostrictive displacement sensor 16 is provided on the inner surface wall of the dust cover 12, an O-ring 17 is provided on the outer surface of the magnetostrictive displacement sensor 16, a hole elastic retaining ring 18 is provided on the outer surface of the O-ring 17, a magnetic isolation sleeve 19 is provided on the outer surface of the magnetic isolation sleeve 19, and a magnetic ring 20 is provided on the outer surface of the magnetic isolation sleeve 19.
[0023] The effects achieved by the entire embodiment 1 are as follows: first, the cylinder assembly 3 realizes bidirectional buffer precision adjustment of the rod chamber and the rodless chamber of the hydraulic cylinder through the first buffer sleeve 4 and the second buffer sleeve 7. The two buffer sleeves are respectively located on both sides of the rod chamber and the rodless chamber. By accurately adjusting the pressure and flow of the buffer medium in the buffer sleeve, the hydraulic cylinder can significantly reduce impact and vibration during the extension and retraction process, thereby extending the service life of the hydraulic cylinder, which not only simplifies the processing and installation process, but also improves the overall performance and reliability of the system. Secondly, a built-in magnetostrictive displacement sensor 16 is installed inside the piston rod 1. The sensor is composed of key components such as a magnetic ring 20, a magnetic isolation sleeve 19, and a steel ball 22. It adopts a non-contact measurement method to collect magnetic field signals in real time and convert them into accurate displacement data. The built-in design avoids direct contact between the sensor and the external environment, eliminates the possibility of mechanical friction and collision, thereby ensuring high measurement accuracy and long sensor life. In addition, during the assembly process, the cylinder bottom 10 is tightly connected to the cylinder assembly 3 by threading the O-ring seal. A sealed cylinder is formed. At the same time, the dust cover 12 and the exhaust screw 23 arranged on the cylinder bottom 10 effectively prevent dust from entering the cylinder and exhaust the internal gas, ensuring the stable operation of the hydraulic cylinder. The piston 5 is firmly connected to the piston rod 1 through the first cylindrical pin 6 and the second cylindrical pin 9, ensuring the stable movement of the piston 5 in the cylinder. In order to improve the sealing performance and working efficiency of the hydraulic cylinder, seals such as O-rings 17 and first O-rings 21 are arranged inside the cylinder assembly 3. The design of these seals not only effectively prevents oil leakage, but also improves the overall performance and stability of the hydraulic cylinder. The piston rod 1 adopts a hollow structure, a position magnet is installed inside, and is isolated by a non-magnetic gasket. The magnetostrictive digital measurement displacement sensor installed on the cylinder bottom 10 contains a displacement sensing rod. When the piston rod 1 moves, the sensing rod moves relative to the magnet to generate a non-contact position signal, so that the position change of the piston rod 1 can be monitored in real time and accurately, and the data is transmitted to the control system through the cable 14 of the displacement sensor, thereby realizing precise control of the hydraulic cylinder.
[0024] Embodiment 2, as Figure 1-Figure 4 As shown, a first O-ring 21 is provided on the outer surface of the magnetic ring 20, a steel ball 22 is provided on the outer surface of the first O-ring 21, an exhaust screw 23 is provided on the inner surface wall of the steel ball 22, a valve seat 24 is provided on the inner surface wall of the cylinder bottom 10, a valve needle 25 is provided on the inner surface wall of the valve seat 24, a polytetrafluoroethylene retaining ring 26 is provided on the outer surface of the valve needle 25, and a second O-ring 27 is provided on the outer surface of the polytetrafluoroethylene retaining ring 26.
[0025] The effect achieved by the entire embodiment 2 is that the rodless chamber of the hydraulic cylinder adopts a support positioning nut 8 to tighten the positioning buffer sleeve with a cylindrical pin to prevent loosening, and the buffer sleeve with a ground outer circle floats and self-centers into the diamond rolling inner hole of the cylinder bottom 10, and cooperates with the valve needle 25 type throttle valve at the cylinder bottom 10. During the rodless chamber buffering process, the valve needle 25 presses against the sealing surface of the valve seat 24, and the buffering pressure is precisely adjusted to achieve precise buffering without impact vibration. During the extension of the cylinder reversing piston rod 1, the rodless chamber enters the oil, and the hydraulic oil is separated from the valve seat 24 through the valve needle 25, and flows out through the gap between the two, quickly opening the hydraulic cylinder, and the piston rod 1 is quickly extended. The rodless chamber is equipped with an exhaust valve to exhaust the air in the oil cylinder to prevent the high-temperature seal from burning during the movement.
[0026] Working principle: First, the cylinder assembly 3 realizes two-way buffer adjustment of the rod chamber and the rodless chamber of the hydraulic cylinder through the first buffer sleeve 4 and the second buffer sleeve 7, by accurately adjusting the pressure and flow of the buffer medium in the buffer sleeve. Secondly, a built-in magnetostrictive displacement sensor 16 is installed inside the piston rod 1. The sensor is composed of key components such as a magnetic ring 20 and a magnetic isolation sleeve 19. It adopts a non-contact measurement method to collect magnetic field signals in real time and convert them into displacement data. The built-in design avoids direct contact between the sensor and the external environment. In addition, during the assembly process, the cylinder bottom 10 is tightly connected to the cylinder assembly 3 through a threaded O-ring seal to form a sealed cylinder body. At the same time, the dust cover 12 and the exhaust screw 23 provided on the cylinder head 2 effectively prevent dust from entering the cylinder body and discharge the internal gas. The piston 5 is firmly connected to the piston rod 1 through the first cylindrical pin 6 and the second cylindrical pin 9, which ensures the stable movement of the piston 5 in the cylinder. 3 is provided with sealing parts such as O-ring 17 and first O-ring 21 inside, piston rod 1 adopts hollow structure, magnetostrictive digital measurement displacement sensor installed at cylinder bottom 10 contains displacement sensing rod, when piston rod 1 moves, sensing rod moves relative to magnet, generates non-contact position signal, makes it possible to monitor position change of piston rod 1 in real time, and transmit data to control system through cable 14 of displacement sensor, rodless cavity of hydraulic cylinder adopts support positioning nut 8 to tighten positioning buffer sleeve, the buffer sleeve with grinding outer circle floats and self-centers into diamond rolling inner hole of cylinder bottom 10, cooperates with valve needle 25 type throttle valve at cylinder bottom 10, during rodless cavity buffering process, valve needle 25 presses valve seat 24 sealing surface, precisely adjusts buffering pressure, during reversing piston rod 1 extension process of oil cylinder, rodless cavity enters oil, hydraulic oil separates from valve seat 24 through valve needle 25, flows out through gap between them, hydraulic cylinder is opened quickly, piston rod 1 is extended quickly, exhaust valve is installed in rodless cavity, exhausts air in oil cylinder.
[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A bidirectional buffer sensor built-in hydraulic cylinder, comprising a piston rod (1), characterized in that: The outer surface of the piston rod (1) is provided with a cylinder head (2), the outer surface of the cylinder head (2) is provided with a cylinder assembly (3), the inner surface wall of the piston rod (1) is provided with a first buffer sleeve (4), the outer surface of the first buffer sleeve (4) is provided with a piston (5), the outer surface of the first buffer sleeve (4) is provided with a first cylindrical pin (6), the inner surface wall of the piston rod (1) is provided with a second buffer sleeve (7), the outer surface of the second buffer sleeve (7) is provided with a supporting positioning nut (8), the outer surface of the second buffer sleeve (7) is provided with a second cylindrical pin (9), the outer surface of the cylinder head (2) is provided with a cylinder bottom (10), and the outer surface of the cylinder bottom (10) is provided with a hexagon socket screw (11).
2. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 1, characterized in that: The outer surface of the cylinder head (2) is provided with a dust cover (12), the outer surface of the dust cover (12) is provided with a fastening screw (13), the inner surface wall of the outer surface of the dust cover (12) is provided with a cable (14), and the outer surface of the dust cover (12) is provided with a cover cap (15).
3. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 2, characterized in that: A magnetostrictive displacement sensor (16) is arranged on the inner surface wall of the dust cover (12), an O-ring (17) is arranged on the outer surface of the magnetostrictive displacement sensor (16), and a hole elastic retaining ring (18) is arranged on the outer surface of the O-ring (17).
4. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 3, characterized in that: The outer surface of the hole elastic retaining ring (18) is provided with a magnetic isolation sleeve (19), and the outer surface of the magnetic isolation sleeve (19) is provided with a magnetic ring (20).
5. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 4, characterized in that: The outer surface of the magnetic ring (20) is provided with a first O-ring (21), the outer surface of the first O-ring (21) is provided with a steel ball (22), and the inner surface wall of the steel ball (22) is provided with an exhaust screw (23).
6. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 5, characterized in that: The inner surface wall of the steel ball (22) is provided with a valve seat (24), and the inner surface wall of the valve seat (24) is provided with a valve needle (25).
7. The bidirectional buffer sensor built-in hydraulic cylinder according to claim 6, characterized in that: The outer surface of the valve needle (25) is provided with a polytetrafluoroethylene retaining ring (26), and the outer surface of the polytetrafluoroethylene retaining ring (26) is provided with a second O-ring (27).