A high-precision, impact-resistant hydraulic cylinder

Abstract

This utility model provides a high-precision, impact-resistant hydraulic cylinder, including a cylinder barrel with a detachable front end cover and a rear end cover at both ends. A piston rod is disposed inside the cylinder barrel, extending through the front end cover to the outside. A piston head is located at one end of the piston rod inside the cylinder barrel, and a first damping spring is built into the piston head. A compression part is bolted to the inner side of the rear end cover, and a second damping spring is built into the compression part. The piston head includes a contraction head and a flat top head. A piston plate is provided on the outer peripheral wall of the flat top head, and the piston plate divides the inside of the cylinder barrel into two independent oil chambers: a first oil chamber and a second oil chamber. The second oil chamber compresses the contraction head of the first oil chamber, causing it to move towards the compression part. Oil enters through a second oil port and exits through a first oil port, creating a pressure difference that drives the piston head to move, causing the contraction head to continuously approach the compression part. When the contraction head touches the compression part, the first and second damping springs compress relative to each other, reducing the impact force.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and in particular to a high-precision, impact-resistant hydraulic cylinder. Background Technology

[0002] In modern industrial production and machinery manufacturing, hydraulic cylinders are widely used in various applications due to their efficient power transmission and excellent force control performance. A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, has no transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] A hydraulic cylinder buffer structure with Chinese patent application number CN201620583819.X is currently disclosed. It includes a cylinder body and a cylinder head. A piston is housed within the cylinder body, and a sealing ring is installed between the piston and the cylinder body. One end of the piston is connected to a piston rod, and the other end of the piston is connected to a buffer chamber located within the cylinder head. The other end of the buffer chamber is connected to an oil port. A throttle valve is also installed on the cylinder body, connected to the inner cavity of the cylinder body through a throttle orifice. The upper end of the throttle valve is connected to the buffer chamber via an oil pipe assembly. This utility model has a reasonable structural design. By using the reverse impact of hydraulic oil, it slows down the piston's movement speed, resulting in a significant buffering effect. Furthermore, the buffer structure provides a stable and reliable buffering effect, has low manufacturing costs, is simple to process, and is easy to maintain.

[0004] However, the aforementioned patent has certain drawbacks in its application. Due to the small throttling area during the initial buffering stage, the hydraulic cylinder typically needs to reciprocate continuously during operation, leading to frequent opening and closing of the throttling valve. Over time, this can cause accelerated wear on the throttling valve, affecting the overall performance and service life of the hydraulic cylinder. To address these issues, a high-precision, impact-resistant hydraulic cylinder is proposed. Utility Model Content

[0005] In order to overcome the shortcomings of existing technologies where the continuous reciprocating motion of hydraulic cylinders leads to increased wear and reduced stability, this utility model provides a high-precision, impact-resistant hydraulic cylinder.

[0006] This utility model is achieved using the following technical solution: A high-precision impact-resistant hydraulic cylinder includes a cylinder barrel with a front end cover and a rear end cover detachably provided at both ends. A piston rod is provided inside the cylinder barrel, extending through the front end cover to the outside. A piston head is provided at one end of the piston rod inside the cylinder barrel. A first damping spring is built into the piston head. A pressing part is bolted to the inside of the rear end cover, and a second damping spring is built into the pressing part. The piston head includes a contraction head and a flat top head. A piston plate is provided on the outer peripheral wall of the flat top head. The piston plate divides the inside of the cylinder into a first oil chamber and a second oil chamber that are independent of each other. The second oil chamber squeezes the contraction head of the first oil chamber to move towards the extrusion section.

[0007] As a preferred embodiment of this utility model, a slider is provided on the outer peripheral wall of the piston plate, and a sliding groove is provided on the inner wall of the cylinder to cooperate with the slider. The slider slides in the sliding groove, and a sealing and pressing element is provided on the outer peripheral wall of the piston plate and the flat top.

[0008] In a preferred embodiment of this utility model, the front end cover is connected to the cylinder by a first bolt, and the rear end cover is connected to the cylinder by a second bolt.

[0009] In a preferred embodiment of this utility model, the piston rod is provided with an upper connection at the end away from the piston head, and the rear end cover is provided with a lower connection on the outside.

[0010] As a preferred embodiment of the present invention, a first oil port is installed on one side of the cylinder, the first oil port is connected to a first oil chamber, and a second oil port is installed on the side of the cylinder away from the first oil port, the second oil port is connected to a second oil chamber.

[0011] As a preferred embodiment of this utility model, the outer peripheral wall of the piston plate is symmetrically provided with a first sealing ring around the slider, and the first sealing ring is in close contact with the inner wall of the cylinder.

[0012] As a preferred embodiment of this utility model, a second sealing ring is provided on the outer peripheral wall of the front end cover and a second sealing ring is provided on the outer peripheral wall of the rear end cover, and the second sealing rings are both tightly attached to the inner wall of the cylinder.

[0013] Compared with existing technologies, the advantages of this utility model are: 1. By setting a piston head at one end of the piston rod inside the cylinder, the piston head is divided into two parts: a contraction head and a flat top head. In actual operation, oil enters through the second oil port and exits through the first oil port, forming a pressure difference that drives the piston head to move. This causes the contraction head to continuously move closer to the extrusion section. When the contraction head touches the extrusion section, the first damping spring built into the piston head and the second damping spring built into the extrusion section compress against each other, reducing the impact force and ensuring balanced pressure inside the cylinder.

[0014] 2. In actual operation, the slider on the outer peripheral wall of the piston plate slides smoothly in the groove on the inner wall of the cylinder, effectively preventing the piston plate from deviating and ensuring the accuracy of the piston. The sealing and clamping parts effectively isolate the first oil chamber from the second oil chamber to prevent oil leakage.

[0015] 3. The front cover and the rear cover are firmly connected by the first bolt and the second bolt, which facilitates maintenance. During installation, simply align the position and align the slider with the slide groove to complete the installation of the piston head without complicated adjustments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the main body of the arc-correcting machine of this utility model; Figure 2 This is a structural diagram of the motor on one side of the main body of the arc straightening machine of this utility model; Figure 3 This is an exploded structural diagram of the arc-correcting device and bending device of this utility model; Figure 4 This is a structural diagram of the bending device of this utility model; Figure 5 This is a structural diagram of the arc-correcting device of this utility model; In the diagram: 1. Cylinder; 11. Front end cover; 12. Rear end cover; 13. First bolt; 14. Second bolt; 15. Lower connection; 2. Piston rod; 21. Upper connection; 3. Piston head; 31. First damping spring; 32. Piston plate; 33. Contraction head; 34. Flat top head; 4. Extrusion section; 41. Second damping spring; 5. Slider; 51. Slide groove; 52. Sealing clamp; 53. First sealing ring; 6. First oil port; 600. First oil chamber; 7. Second oil port; 700. Second oil chamber; 8. Second sealing ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] Example: Please see Figures 1-5 A high-precision, impact-resistant hydraulic cylinder includes a cylinder barrel 1. A front end cover 11 and a rear end cover 12 are detachably provided at both ends of the cylinder barrel 1. A piston rod 2 is provided inside the cylinder barrel 1. The piston rod 2 extends through the front end cover 11 to the outside. A piston head 3 is provided at one end of the piston rod 2 inside the cylinder barrel 1. A first damping spring 31 is built into the piston head 3. A pressing part 4 is bolted to the inner side of the rear end cover 12. A second damping spring 41 is built into the pressing part 4.

[0019] In this embodiment, a front end cover 11 and a rear end cover 12 are respectively provided at both ends of the cylinder 1. The front end cover 11 and the rear end cover 12 are detachably installed at both ends of the cylinder 1. After the front end cover 11 and the rear end cover 12 are installed, a sealed space is formed inside the cylinder 1. The piston rod 2 reciprocates inside the cylinder 1. One end of the piston rod 2 is connected to the piston head 3, which is located inside the cylinder 1. The other end of the piston rod 2 extends to the outside of the cylinder 1. The first damping spring 31 built into the piston head 3 provides buffering when the piston moves. The pressing part 4 is fixed to the inside of the rear end cover 12 by bolts. At the same time, the pressing part 4 is located inside the cylinder 1, and the pressing part 4 is opposite to the piston head 3.

[0020] The piston head 3 includes a contraction head 33 and a flat top head 34. A piston plate 32 is provided on the outer peripheral wall of the flat top head 34. The piston plate 32 divides the inside of the cylinder 1 into a first oil chamber 600 and a second oil chamber 700 that are independent of each other. The second oil chamber 700 squeezes the contraction head 33 of the first oil chamber 600 to move towards the compression part 4.

[0021] In this embodiment, the piston head 3 includes a contraction head 33 and a flat top head 34. The flat top head 34 is connected to the piston rod 2. The contraction head 33 is the end portion, closer to the extrusion part 4. A piston plate 32 is provided on the outer peripheral wall of the flat top head 34. The piston plate 32 is in close contact with the inner peripheral wall of the cylinder 1. The piston plate 32 divides the sealed space inside the cylinder 1 into a first oil chamber 600 and a second oil chamber 700. The contraction head 33 and the extrusion part 4 are both located in the first oil chamber 600. During the movement, the piston plate 32 is in close contact with the inner wall of the cylinder 1. When the pressure in the second oil chamber 700 increases, the piston plate 32 moves towards the first oil chamber 600, causing the contraction head 33 at the end of the piston head 3 to gradually move closer to the extrusion part 4. The volume of the first oil chamber 600 decreases. When the contraction head 33 touches the extrusion part 4, the first damping spring 31 built into the piston head 3 and the second damping spring 41 built into the extrusion part 4 compress relative to each other, reducing the impact force, ensuring the pressure balance inside the cylinder 1, and maintaining the stable operation of the system.

[0022] As a preferred embodiment of this utility model, a slider 5 is provided on the outer peripheral wall of the piston plate 32, and a sliding groove 51 that cooperates with the slider 5 is provided on the inner wall of the cylinder 1. The slider 5 slides in the sliding groove 51, and a sealing and pressing member 52 is provided on the outer peripheral wall of the piston plate 32 and the flat top head 34.

[0023] In this embodiment, the slider 5 on the outer peripheral wall of the piston plate 32 is used to guide the movement trajectory of the piston head 3 and the piston plate 32. The slider 5 slides smoothly in the groove 51 on the inner wall of the cylinder 1, effectively preventing the piston plate 32 from deviating. The slider 5 is a protruding structure on the outer peripheral wall of the piston plate 32. The groove 51 that cooperates with the slider 5 is provided inside the cylinder 1. The groove 51 extends between the first oil chamber 600 and the second oil chamber 700. The slider 5 is precisely guided in the groove 51 to ensure that the piston plate 32 operates stably under high pressure. A notch is provided close to the piston plate 32 and the flat top head 34. A sealing clamping member 52 is embedded in the notch. The sealing clamping member 52 effectively isolates the first oil chamber 600 and the second oil chamber 700 to prevent oil leakage.

[0024] In a preferred embodiment of this utility model, the front end cover 11 is connected to the cylinder 1 by a first bolt 13, and the rear end cover 12 is connected to the cylinder 1 by a second bolt 14.

[0025] In this embodiment, the front cover 11 is fixed to the front end of the cylinder 1 by the first bolt 13, and the rear cover 12 is fixed to the rear end of the cylinder 1 by the second bolt 14. The detachable connection between the front cover 11 and the rear cover 12 facilitates maintenance and installation.

[0026] As a preferred embodiment of this utility model, the piston rod 2 is provided with an upper connection 21 at the end away from the piston head 3, and the rear end cover 12 is provided with a lower connection 15 on the outer side.

[0027] In this embodiment, an upper connection 21 is provided at the front end of the piston rod 2, specifically located at the end of the piston rod 2 away from the piston head 3. A lower connection 15 is provided on the outer side of the rear end cover 12. The function of the upper connection 21 and the lower connection 15 is to realize a stable connection between the piston rod 2 and the external equipment, ensuring efficient and stable power transmission.

[0028] As a preferred embodiment of the present invention, a first oil port 6 is installed on one side of the cylinder 1, and the first oil port 6 communicates with the first oil chamber 600. A second oil port 7 is installed on the side of the cylinder 1 away from the first oil port 6, and the second oil port 7 communicates with the second oil chamber 700.

[0029] In this embodiment, a first oil port 6 is installed on one side of the cylinder 1, and a second oil port 7 is installed on the other side of the cylinder 1. The first oil port 6 is connected to the first oil chamber 600, and the second oil port 7 is connected to the second oil chamber 700. When oil enters through the first oil port 6, the pressure in the first oil chamber 600 increases, pushing the piston plate 32 to move towards the second oil chamber 700, and the second oil port 7 discharges oil. The principle of oil entering through the second oil port 7 is the opposite, and will not be elaborated further. When oil enters through the second oil port 7 and oil exits through the first oil port 6, a pressure difference is formed, which drives the piston head 3 to move, causing the contraction head 33 to continuously approach the extrusion section 4. When the contraction head 33 touches the extrusion section 4, the first damping spring 31 built into the piston head 3 and the second damping spring 41 built into the extrusion section 4 compress against each other, reducing the impact force and ensuring that the pressure inside the cylinder 1 is balanced.

[0030] As a preferred embodiment of this utility model, the outer peripheral wall of the piston plate 32 is symmetrically provided with a first sealing ring 53 around the slider 5, and the first sealing ring 53 is in close contact with the inner wall of the cylinder 1.

[0031] In this embodiment, there are two first sealing rings 53, which are respectively installed on the outer peripheral wall of the piston plate 32. The first sealing rings 53 are in close contact with the inner peripheral wall of the cylinder 1. The two first sealing rings 53 are respectively located at the junction of the first oil chamber 600 and the second oil chamber 700, effectively separating the oil chambers and preventing oil from flowing between them.

[0032] As a preferred embodiment of this utility model, a second sealing ring 8 is provided on the outer peripheral wall of the front end cover 11 and a second sealing ring 8 is provided on the outer peripheral wall of the rear end cover 12, and the second sealing ring 8 is in close contact with the inner wall of the cylinder 1.

[0033] In this embodiment, the outer peripheral walls of the front cover 11 and the rear cover 12 are provided with a second sealing ring 8. The second sealing ring 8 is in close contact with the inner peripheral wall of the cylinder 1. The function of the second sealing ring 8 is to prevent oil from leaking from the connection between the front cover 11 and the rear cover 12, and to ensure that the oil circulates in the cylinder 1.

[0034] The principle of this utility model is as follows: When oil enters through the second oil port 7, the pressure in the second oil chamber 700 increases, the pressure in the first oil chamber 600 decreases, and the oil in the second oil chamber 700 is discharged from the second oil port 7. During this process, the piston head 3 is driven to move, causing the contraction head 33 located in the first oil chamber 600 to continuously approach the extrusion part 4. When the contraction head 33 touches the extrusion part 4, the first damping spring 31 built into the piston head 3 is compressed, and at the same time, the second damping spring 41 located in the extrusion part 4 also begins to compress. The two work together to effectively absorb the impact force and ensure the stability of the internal pressure of the cylinder 1. During the movement of the piston plate 32, the slider 5 set on the outer peripheral wall of the piston plate 32 slides smoothly in the groove 51 on the inner wall of the cylinder 1, effectively preventing the piston plate 32 from deviating and ensuring the accuracy of the piston.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A high-precision, impact-resistant hydraulic cylinder, comprising a cylinder barrel (1), with a front end cap (11) and a rear end cap (12) detachably disposed at both ends of the cylinder barrel (1), and a piston rod (2) disposed inside the cylinder barrel (1), the piston rod (2) extending through the front end cap (11) to the outside, characterized in that: The piston rod (2) is located inside the cylinder (1) and has a piston head (3) at one end. The piston head (3) has a first damping spring (31) built in it. The inner side of the rear end cover (12) is bolted to a pressing part (4), and the pressing part (4) has a second damping spring (41) built in it. The piston head (3) includes a contraction head (33) and a flat top head (34). The outer peripheral wall of the flat top head (34) is provided with a piston plate (32). The piston plate (32) divides the inside of the cylinder (1) into a first oil chamber (600) and a second oil chamber (700) that are independent of each other. The second oil chamber (700) squeezes the contraction head (33) of the first oil chamber (600) to move towards the extrusion part (4).

2. The high-precision impact-resistant hydraulic cylinder according to claim 1, characterized in that: A slider (5) is provided on the outer peripheral wall of the piston plate (32), and a sliding groove (51) is provided on the inner wall of the cylinder (1) to cooperate with the slider (5). The slider (5) slides in the sliding groove (51), and a sealing and pressing element (52) is provided on the outer peripheral wall of the piston plate (32) and the flat top head (34).

3. The high-precision impact-resistant hydraulic cylinder of claim 1, wherein: The front end cover (11) is connected to the cylinder (1) by a first bolt (13), and the rear end cover (12) is connected to the cylinder (1) by a second bolt (14).

4. The high-precision impact-resistant hydraulic cylinder of claim 1, wherein: The piston rod (2) is provided with an upper connection (21) at the end away from the piston head (3), and the rear end cover (12) is provided with a lower connection (15) on the outside.

5. The high-precision impact-resistant hydraulic cylinder of claim 1, wherein: A first oil port (6) is installed on one side of the cylinder (1), and the first oil port (6) is connected to the first oil chamber (600). A second oil port (7) is installed on the side of the cylinder (1) away from the first oil port (6), and the second oil port (7) is connected to the second oil chamber (700).

6. The high-precision impact-resistant hydraulic cylinder of claim 2, wherein: The piston plate (32) has a first sealing ring (53) symmetrically arranged on the outer peripheral wall with the slider (5) as the center. The first sealing ring (53) is in close contact with the inner wall of the cylinder (1).

7. The high-precision impact-resistant hydraulic cylinder of claim 1, wherein: A second sealing ring (8) is provided on the outer peripheral wall of the front end cover (11) and a second sealing ring (8) is provided on the outer peripheral wall of the rear end cover (12). The second sealing rings (8) are both in close contact with the inner wall of the cylinder (1).

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