Hydraulic cylinder with bidirectional position detection function
By setting up position detection devices and buffer components in the rod-side cavity and rod-less cavity of the hydraulic cylinder, the problem of unilateral detection of traditional hydraulic cylinders is solved, and the two-way precise control of the hydraulic cylinder is achieved, which reduces impact force and mechanical wear, and improves working accuracy and stability.
Patent Information
- Application Number
- CN202422234728.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-11
AI Technical Summary
Traditional hydraulic cylinders can only perform single-side position detection, resulting in a long-stroke hydraulic cylinder that produces impact force when the piston reaches its limit position, affecting wear of mechanical components, and cannot achieve bidirectional precise position control in the die-casting process.
Position detection devices are respectively set up in the rod-with and rod-free chambers of the hydraulic cylinder, and are equipped with front buffer components and rear buffer components. By detecting the limit position of the piston, the piston speed is slowed down and the two-way precise control is achieved.
The bidirectional position detection of the hydraulic cylinder is realized, which reduces the impact force during piston impact, improves control accuracy and service life of mechanical components, and reduces noise and vibration.
Smart Images
Figure CN223075901U_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 two-way position detection function. Background Art
[0002] In the applications of long-stroke hydraulic cylinders and die-casting machines, traditional hydraulic cylinders face many challenges. For long-stroke hydraulic cylinders, the reciprocating movement of the piston over a long distance is likely to generate a large impact force. Especially when the piston reaches the extreme position, without an effective buffering mechanism, it will cause serious wear to the hydraulic cylinder and related mechanical components.
[0003] In the die-casting process, the hydraulic cylinder needs to have high-precision position control capabilities to ensure the accuracy of mold closing and opening, which is crucial for ensuring the quality of die-cast parts. The position detection devices of traditional hydraulic cylinders usually can only perform position detection on one side, which is insufficient in the die-casting process that requires two-way precise control. Summary of the Utility Model
[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a hydraulic cylinder with a two-way position detection function, which is used to solve the problem of insufficient control accuracy due to only one-sided position detection of the hydraulic cylinder in the prior art.
[0005] To achieve the above purpose and other related purposes, the present utility model provides the following technical solutions:
[0006] A hydraulic cylinder with a two-way position detection function includes a cylinder block and a piston assembly disposed inside the cylinder block. The piston assembly includes a piston rod and a piston sleeved on the piston rod. The piston divides the interior of the cylinder block into a rod chamber and a rodless chamber. A first position detection device is provided in the rod chamber, and a second position detection device is provided in the rodless chamber; a front buffer assembly located in the rod chamber and a rear buffer assembly located in the rodless chamber are provided on the piston rod.
[0007] Implementing the above technical solution, during the movement of the piston, the first position detection device and the second position detection device can detect the extreme positions reached by the piston, and thus feedback to the control system to stop the hydraulic system from supplying oil or change the direction; the setting of the front buffer assembly and the rear buffer assembly can slow down the speed of the piston, thereby reducing the impact force when the piston hits the end of the cylinder block, playing a buffering role; by providing position detection devices at both ends of the hydraulic cylinder, two-way precise control of the piston position can be achieved, improving the working accuracy of the hydraulic cylinder.
[0008] In an embodiment of the present utility model, a rear cover is provided at one end of the cylinder block, a flange is provided at the other end of the cylinder block, a guide sleeve for the piston rod to pass through is embedded in the flange, and a front cover is provided between the flange and the cylinder block.
[0009] To achieve the above technical solution, front and rear covers are respectively provided at both ends of the cylinder block of the hydraulic cylinder. This structural design closes both ends of the cylinder block and forms two independent chambers, namely the rod chamber and the non-rod chamber, through the piston; the guide sleeve embedded in the flange is used to guide the linear movement of the piston rod, ensuring the straightness and stability of the piston rod during movement, and preventing deflection and shaking; the first position detection device and the second position detection device can monitor the position of the piston in real time. Whether the piston rod extends or retracts, the stroke information of the piston can be accurately fed back.
[0010] In an embodiment of the present utility model, the first position detection device includes a first switch seat provided on the front cover, a first protective sleeve provided on the first switch seat, and a first proximity switch located in the first protective sleeve, passing through the first switch seat and the front cover and extending into the rod chamber.
[0011] To achieve the above technical solution, the first switch seat is installed on the front cover, providing a fixed and supporting platform for the first proximity switch and being protected by the first protective sleeve to prevent damage to the first proximity switch caused by the external environment; when the piston moves to a position close to the first proximity switch, the first proximity switch can detect the position of the piston and transmit a signal to the control system. The control system decides whether to stop oil supply or change the direction of the hydraulic oil according to the received signal, thereby achieving precise control of the piston position.
[0012] In an embodiment of the present utility model, the second position detection device includes a second switch seat provided on the rear cover, a second protective sleeve provided on the second switch seat, and a second proximity switch located in the second protective sleeve, passing through the second switch seat and the rear cover and extending into the non-rod chamber.
[0013] To achieve the above technical solution, the second switch seat is installed on the rear cover, providing a stable fixed platform for the second proximity switch, ensuring the stability and reliability of the second switch during operation; the design of the second protective sleeve protects the second proximity switch from external factors, improving the durability and reliability of the second proximity switch. The combined design of the second switch seat and the second protective sleeve makes the installation and disassembly of the second proximity switch simple, facilitating daily inspection and maintenance work. Since the second proximity switch is protected and the impact of the piston is reduced through precise position detection, mechanical wear is reduced.
[0014] In an embodiment of the present utility model, the rear buffer assembly includes a rear buffer seat sleeved on the piston rod, and a rear buffer sleeve nested on the outer wall of the rear buffer seat and abutting against the piston.
[0015] To achieve the above technical solution, the rear buffer assembly is composed of a rear buffer seat and a rear buffer sleeve. This structural design is used to absorb the impact force when the piston moves to the end of the stroke on the rodless cavity side, reducing damage to the cylinder block and the piston; through the absorption of the rear buffer assembly, the vibration and noise during the operation of the hydraulic cylinder can be reduced, improving the smoothness of the system and the comfort of the working environment.
[0016] In an embodiment of the present utility model, the front buffer assembly includes a stop tube sleeved on the piston rod and abutting against the piston, a front buffer seat nested in the outer wall of the piston rod and abutting against the stop tube, and a front buffer sleeve nested in the outer wall of the front buffer seat and abutting against the stop tube.
[0017] To achieve the above technical solution, the stop tube is sleeved on the piston rod and abuts against the piston, mainly used to prevent the piston from moving on the piston rod. The front buffer seat is nested in the outer wall of the piston rod and abuts against the stop tube, used to fix the position of the stop tube and provide support; both the front buffer sleeve and the rear buffer sleeve are made of ductile iron. Ductile iron has high strength and good wear resistance, can withstand large impact forces, is suitable for key components such as buffer sleeves, and extends the service life of the hydraulic cylinder.
[0018] In an embodiment of the present utility model, sealing rings are provided between the piston and the cylinder block, and between the guide sleeve and the piston rod.
[0019] To achieve the above technical solution, a sealing ring is provided between the piston and the cylinder block, used to prevent hydraulic oil from leaking through the gap between the piston and the cylinder block, ensuring the normal working pressure of the hydraulic cylinder and the effective stroke of the piston; a sealing ring is provided between the guide sleeve and the piston rod, used to prevent hydraulic oil from leaking through the gap between the guide sleeve and the piston rod, enhancing the reliability and stability of the hydraulic cylinder.
[0020] In an embodiment of the present utility model, clearance fits are provided between the rear buffer seat and the rear buffer sleeve, and between the front buffer seat and the front buffer sleeve.
[0021] To implement the above technical solution, there is a 0.5mm matching clearance between the rear buffer seat and the rear buffer sleeve, and between the front buffer seat and the front buffer sleeve. Due to the existence of the clearance, the buffer sleeve can move in a small range in the buffer seat, thereby achieving self-adjustment. This design reduces the requirements for the concentricity of the front buffer assembly and the rear buffer assembly, so that even when there is a slight offset between the piston rod and the cylinder body, the buffer assembly can still effectively absorb the impact force, ensuring the efficient operation of the hydraulic cylinder. At the same time, this design reduces the difficulty of processing and maintenance costs.
[0022] As described above, the hydraulic cylinder with bidirectional position detection function of the utility model has the following beneficial effects:
[0023] 1. Bidirectional position control: By setting position detection devices in the rod chamber and rodless chamber of the hydraulic cylinder, the bidirectional precise control of the piston position is realized. The first position detection device and the second position detection device can monitor the position of the piston in real time and feed back the signal to the control system, so that the control system can adjust the flow direction of the hydraulic oil or stop the oil supply in time, thereby avoiding the piston from being over-positioned and improving the control accuracy and reliability of the hydraulic cylinder.
[0024] 2. Enhanced buffering performance: The design of the front buffer assembly and the rear buffer assembly effectively slows down the impact speed of the piston at the end of the stroke, reduces the impact force, thereby reducing mechanical noise and vibration, and improving the service life and operational safety of the hydraulic cylinder.
[0025] 3. Structural optimization: The design of the front and rear covers at both ends of the cylinder body and the embedding of the guide sleeve ensure the linear motion and stability of the piston rod, reducing the error caused by the deflection or shaking of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 Shown is a schematic diagram of the structure of the utility model.
[0027] Figure 2 Display as Figure 1 A partial enlarged view of point A in the middle.
[0028] Figure 3 Display as Figure 1 A partial enlarged view of point B in the middle.
[0029] Component number description
[0030] 1. Cylinder block; 2. Piston rod; 3. Piston; 4. Rod chamber; 5. Rodless chamber; 6. Rear cover; 7. Flange; 8. Guide sleeve; 9. Front cover; 10. First switch seat; 11. First protective sleeve; 12. First proximity switch; 13. Second switch seat; 14. Second protective sleeve; 15. Second proximity switch; 16. Rear buffer seat; 17. Rear buffer sleeve; 18. Stop tube; 19. Front buffer seat; 20. Front buffer sleeve; 21. Sealing ring. Detailed implementation manners
[0031] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0032] Please refer to Figures 1 to 3 , the present invention provides a hydraulic cylinder with a bidirectional position detection function, including a cylinder block 1, a piston 3 assembly arranged inside the cylinder block 1, the piston 3 assembly includes a piston rod 2 and a piston 3 sleeved on the piston rod 2, the piston 3 divides the interior of the cylinder block 1 into a rod chamber 4 and a rodless chamber 5, a first position detection device is arranged in the rod chamber 4, and a second position detection device is arranged in the rodless chamber 5; a front buffer assembly located in the rod chamber 4 and a rear buffer assembly located in the rodless chamber 5 are arranged on the piston rod 2.
[0033] During the movement of the piston 3, the first position detection device and the second position detection device can detect the limit positions reached by the piston 3, and then feedback to the control system to stop the hydraulic system from supplying oil or change the direction; the arrangement of the front buffer assembly and the rear buffer assembly can slow down the speed of the piston 3, thereby reducing the impact force when the piston 3 hits the end of the cylinder block 1 and playing a buffering role; by arranging position detection devices at both ends of the hydraulic cylinder, bidirectional precise control of the position of the piston 3 can be achieved, and the working precision of the hydraulic cylinder can be improved.
[0034] A rear cover 6 is arranged at one end of the cylinder block 1, a flange 7 is arranged at the other end of the cylinder block 1, a guide sleeve 8 for the piston rod 2 to pass through is embedded in the flange 7, and a front cover 9 is arranged between the flange 7 and the cylinder block 1. The front cover 9 and the rear cover 6 are respectively arranged at both ends of the cylinder block 1 of the hydraulic cylinder. This structural design makes both ends of the cylinder block 1 closed, and two independent chambers, namely the rod chamber 4 and the rodless chamber 5, are formed through the piston 3; the guide sleeve 8 embedded in the flange 7 is used to guide the linear movement of the piston rod 2, ensuring the straightness and stability of the piston rod 2 during the movement, and preventing deviation and shaking; the first position detection device and the second position detection device can monitor the position of the piston 3 in real time, and can accurately feedback the stroke information of the piston 3 whether the piston rod 2 extends or retracts.
[0035] The first position detection device includes a first switch base 10 provided on the front cover 9, a first protective sleeve 11 provided on the first switch base 10, and a first proximity switch 12 located in the first protective sleeve 11, passing through the first switch base 10 and the front cover 9 and extending into the rod chamber 4. The first switch base 10 is installed on the front cover 9, providing a fixed and supporting platform for the first proximity switch 12 and being protected by the first protective sleeve 11 to prevent the external environment from damaging the first proximity switch 12. When the piston 3 moves to a position close to the first proximity switch 12, the first proximity switch 12 can detect the position of the piston 3 and transmit a signal to the control system. The control system decides whether to stop fuel supply or change the direction of the hydraulic oil according to the received signal, thereby achieving precise control of the position of the piston 3.
[0036] The second position detection device includes a second switch base 13 provided on the rear cover 6, a second protective sleeve 14 provided on the second switch base 13, and a second proximity switch 15 located in the second protective sleeve 14, passing through the second switch base 13 and the rear cover 6 and extending into the rodless chamber 5. The second switch base 13 is installed on the rear cover 6, providing a stable fixed platform for the second proximity switch 15 to ensure the stability and reliability of the second switch during operation. The design of the second protective sleeve 14 protects the second proximity switch 15 from external factors, improving the durability and reliability of the second proximity switch 15. The combined design of the second switch base 13 and the second protective sleeve 14 makes the installation and disassembly of the second proximity switch 15 simple, facilitating daily inspection and maintenance work. Since the second proximity switch 15 is protected and the impact on the piston 3 is reduced through precise position detection, mechanical wear is reduced.
[0037] The rear buffer assembly includes a rear buffer seat 16 sleeved on the piston rod 2 and a rear buffer sleeve 17 nested on the outer wall of the rear buffer seat 16 and abutting against the piston 3. The rear buffer assembly is composed of the rear buffer seat 16 and the rear buffer sleeve 17. This structural design is used to absorb the impact force when the piston 3 moves to the end of the stroke on the rodless chamber 5 side, reducing damage to the cylinder block 1 and the piston 3. Through the absorption of the rear buffer assembly, the vibration and noise during the operation of the hydraulic cylinder can be reduced, improving the smoothness of the system and the comfort of the working environment.
[0038] The front buffer assembly includes a stop tube 18 sleeved on the piston rod 2 and abutted against the piston 3, a front buffer seat 19 nested in the outer wall of the piston rod 2 and abutted against the stop tube 18, and a front buffer sleeve 20 nested in the outer wall of the front buffer seat 19 and abutted against the stop tube 18. The stop tube 18 is sleeved on the piston rod 2 and abutted against the piston 3, mainly used to prevent the piston 3 from moving on the piston rod 2. The front buffer seat 19 is nested in the outer wall of the piston rod 2 and abuts against the stop tube 18, used to fix the position of the stop tube 18 and provide support. Both the front buffer sleeve 20 and the rear buffer sleeve 17 are made of ductile iron. Ductile iron has high strength and good wear resistance, can withstand large impact forces, is suitable for key components such as buffer sleeves, and extends the service life of the hydraulic cylinder.
[0039] Sealing rings 21 are provided between the piston 3 and the cylinder block 1, and between the guide sleeve 8 and the piston rod 2. The sealing ring 21 is provided between the piston 3 and the cylinder block 1 to prevent hydraulic oil from leaking from the gap between the piston 3 and the cylinder block 1, ensuring the normal working pressure of the hydraulic cylinder and the effective stroke of the piston 3. The sealing ring 21 is provided between the guide sleeve 8 and the piston rod 2 to prevent hydraulic oil from leaking from the gap between the guide sleeve 8 and the piston rod 2, enhancing the reliability and stability of the hydraulic cylinder.
[0040] There is a clearance fit between the rear buffer seat 16 and the rear buffer sleeve 17, and between the front buffer seat 19 and the front buffer sleeve 20. There is a 0.5 mm fit clearance between the rear buffer seat 16 and the rear buffer sleeve 17, and between the front buffer seat 19 and the front buffer sleeve 20. Due to the existence of the clearance, the buffer sleeve can move within a small range in the buffer seat, thus realizing self-adjustment. This design reduces the requirement for the concentricity of the front buffer assembly and the rear buffer assembly, so that even when there is a slight offset between the piston rod 2 and the cylinder block 1, the buffer assembly can still effectively absorb the impact force, ensuring the efficient operation of the hydraulic cylinder. At the same time, this design reduces the processing difficulty and maintenance cost.
[0041] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. All equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.
Claims
1. A hydraulic cylinder with a two-way position detection function, comprising a cylinder block and a piston assembly disposed inside the cylinder block. The piston assembly includes a piston rod and a piston sleeved on the piston rod. The piston divides the interior of the cylinder block into a rod chamber and a rodless chamber, and is characterized in that: A first position detection device is provided in the rod chamber, and a second position detection device is provided in the rodless chamber; A front buffer assembly located in the rod chamber and a rear buffer assembly located in the rodless chamber are provided on the piston rod.
2. The hydraulic cylinder with a two-way position detection function according to claim 1, characterized in that: A rear cover is provided at one end of the cylinder block, a flange is provided at the other end of the cylinder block, a guide sleeve for the piston rod to pass through is embedded in the flange, and a front cover is provided between the flange and the cylinder block.
3. The hydraulic cylinder with a two-way position detection function according to claim 2, characterized in that: The first position detection device includes a first switch seat provided on the front cover, a first protective sleeve provided on the first switch seat, and a first proximity switch located in the first protective sleeve, passing through the first switch seat and the front cover and extending into the rod chamber.
4. The hydraulic cylinder with a two-way position detection function according to claim 2, wherein: The second position detection device includes a second switch seat provided on the rear cover, a second protective sleeve provided on the second switch seat, and a second proximity switch located in the second protective sleeve, passing through the second switch seat and the rear cover and extending into the rodless chamber.
5. The hydraulic cylinder with a two-way position detection function according to claim 1, wherein: The rear buffer assembly includes a rear buffer seat sleeved on the piston rod and a rear buffer sleeve nested on the outer wall of the rear buffer seat and abutting against the piston.
6. The hydraulic cylinder with a two-way position detection function according to claim 5, characterized in that: The front buffer assembly includes a stop tube sleeved on the piston rod and abutting against the piston, a front buffer seat nested in the outer wall of the piston rod and abutting against the stop tube, and a front buffer sleeve nested in the outer wall of the front buffer seat and abutting against the stop tube.
7. The hydraulic cylinder with a bidirectional position detection function according to claim 2, wherein: Sealing rings are provided between the piston and the cylinder block and between the guide sleeve and the piston rod.
8. The hydraulic cylinder with a two-way position detection function according to claim 6, characterized in that: A clearance fit is provided between the rear buffer seat and the rear buffer sleeve and between the front buffer seat and the front buffer sleeve.