A cushioned oil cylinder

Abstract

A buffer oil cylinder, which comprises a cylinder body, a piston cavity is arranged in the cylinder body, a rear cylinder cover is arranged at the rear end of the cylinder body, and a buffer cavity is arranged in the rear cylinder cover; a piston rod, a piston and a buffer column are arranged in the piston cavity; the piston is fixedly sleeved on the piston rod; the front end of the buffer column is connected with the rear end surface of the piston rod, and the rear end of the buffer column can extend into the buffer cavity when the piston rod moves to the rear cylinder cover; a valve core cavity is arranged in the buffer column, the front end of the valve core cavity is sealed, the rear end of the valve core cavity is opened, a cavity cover is arranged at the rear end opening of the valve core cavity; an oil hole one is arranged in the cavity cover; an oil hole two is arranged in the buffer column, and the oil hole two is close to the front end of the buffer column; a valve core is arranged in the valve core cavity, and an oil passing channel is arranged in the valve core; the side wall of the valve core is in contact with the side wall of the valve core cavity, and the front end of the oil hole one is sealed by the rear end of the valve core when the rear end of the valve core is in contact with the front end of the cavity cover. The oil cylinder can not only maintain the buffering effect when the piston rod retreats, but also ensure that the piston rod quickly extends forward.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and in particular to a buffer hydraulic cylinder. Background Technology

[0002] High-speed hydraulic cylinders generate significant impact and noise due to their short operating time and high pressure. To address this issue, a buffer hydraulic cylinder has been designed.

[0003] Existing buffer cylinders such as Figure 1 As shown, the rear end of the piston rod 8 is equipped with a buffer column 6, while the rear cylinder head 4 integrates a buffer chamber 5 and an oil passage 3. When the piston rod 8 moves backward, the rear end of the buffer column 6 can enter the buffer chamber 5. During this process, the hydraulic oil in the piston chamber 7 does not directly flow into the buffer chamber 5 and the oil passage 3, but is restricted to slowly flowing out through the narrow gap between the buffer column 6 and the buffer chamber 5, thereby slowing down the flow rate of the hydraulic oil. This design causes the pressure at the rear end of the piston chamber 7 to gradually accumulate, effectively slowing down the backward movement of the piston rod 8, achieving a buffering effect, and significantly reducing the collision impact between the piston rod 8 and the rear end of the piston chamber 7 and the resulting noise.

[0004] However, the limitations of the existing design become apparent when the piston rod needs to move forward. Hydraulic oil enters through the oil passage, and because the hydraulic oil can initially only act directly on the rear end of the buffer column, the forward momentum of the piston rod is limited, resulting in a slow starting speed and difficulty in matching the performance requirements of high-speed cylinders.

[0005] In view of the above shortcomings, designing a new type of buffer cylinder that can both maintain the buffering effect when the piston rod retracts and ensure that the piston rod extends forward quickly has become an urgent technical problem to be solved. Utility Model Content

[0006] The purpose of this utility model is to provide a buffer cylinder that addresses the aforementioned problems. This cylinder can maintain the buffering effect when the piston rod retracts while ensuring that the piston rod extends forward quickly.

[0007] The technical solution adopted in this utility model is as follows: A buffer cylinder includes a cylinder body, a piston chamber inside the cylinder body, a rear cylinder cover at the rear end of the cylinder body, a buffer chamber on the rear cylinder cover, the buffer chamber being open at the front end and sealed at the rear end, the front end of the buffer chamber communicating with the rear end of the piston chamber; an oil passage is provided on the rear cylinder cover, and the rear end of the buffer chamber communicating with the external space of the rear cylinder cover through the oil passage. The piston chamber is provided with a piston rod, a piston, and a buffer column; The piston is fixedly sleeved on the piston rod, and the side wall of the piston contacts the side wall of the piston cavity, and can move back and forth within the piston cavity; The front end of the buffer column is connected to the rear end face of the piston rod. When the piston rod moves toward the rear cylinder head, the rear end of the buffer column can extend into the buffer cavity. The buffer column has a valve core cavity, the front end of the valve core cavity is sealed and the rear end is open, and a cavity cover is provided at the rear end opening of the valve core cavity; The cavity cover is provided with an oil hole, which allows the buffer cavity to communicate with the valve core cavity through the oil hole. The buffer column is provided with an oil hole two, which is located near the front end of the buffer column, so that the piston chamber can communicate with the valve core chamber through the oil hole two. The valve core cavity is provided with a valve core, and an oil passage is opened on the valve core. The oil hole one and the oil hole two can be connected through the oil passage. The sidewall of the valve core contacts the sidewall of the valve core cavity and can move back and forth within the valve core cavity. When the rear end of the valve core contacts the front end of the cavity cover, the front end of the oil hole is sealed by the rear end of the valve core.

[0008] Furthermore, the oil passage is located at the edge of the valve core, and the extension direction of the oil passage is consistent with the length direction of the valve core; the first oil hole is opened at the center of the cavity cover; when the rear end of the valve core contacts the front end of the cavity cover, the rear end of the oil passage is sealed by the edge of the front end of the cavity cover, and the front end of the first oil hole is sealed by the middle area of ​​the rear end of the valve core.

[0009] Furthermore, the oil passage is an oil hole opened at the edge of the valve core; the oil hole is a through hole.

[0010] Furthermore, the oil passage is an oil groove formed on the side wall of the valve core; the oil groove is a through groove.

[0011] Furthermore, the second oil hole is opened on the side wall of the buffer column and penetrates the side wall of the valve core cavity; the diameter of the front end of the valve core is smaller than the diameter of the rear end of the valve core. When the front end of the valve core is located at the front end of the valve core cavity, there is a connecting cavity between the side wall of the front end of the valve core and the side wall of the valve core cavity, so that the second oil hole can communicate with the oil passage through the connecting cavity.

[0012] Furthermore, the valve core includes a columnar valve core front section and a valve core rear section. The diameter of the valve core front section is smaller than the diameter of the valve core rear section. The sidewall of the valve core rear section contacts the sidewall of the valve core cavity. The oil passage is opened at the edge of the valve core rear section and extends through the front and rear ends of the valve core rear section.

[0013] Furthermore, the front end face of the valve core cavity is a plane, while the front end face of the valve core front section is a spherical surface.

[0014] Furthermore, when the front end face of the valve core contacts the front end face of the valve core cavity, the position of the second oil hole is within the length range of the front end of the valve core.

[0015] Furthermore, the front end of the buffer cavity is chamfered, which makes the front end opening of the buffer cavity open outward.

[0016] Furthermore, when all the buffer columns are located inside the buffer cavity, the second oil hole is located at the chamfer at the front end of the buffer cavity.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: Compared with the prior art, the hydraulic oil in the prior art can only act on the rear end of the buffer column, resulting in a slow forward extension speed of the piston rod. In this invention, the hydraulic oil can act quickly on the rear end of the piston rod and piston. Since the area of ​​the piston rod and the rear end of the piston is larger than that of the buffer column, it can be subjected to a greater thrust, thereby ensuring that the piston rod extends outward quickly. Attached Figure Description

[0018] Figure 1 Diagram of existing technology structure; Figure 2 A structural diagram showing the insertion of the buffer column into the buffer cavity; Figure 3 A structural diagram showing the entire buffer column inserted into the buffer cavity; Figure 4 This is a diagram of the internal structure of the buffer column; Figure 5 This is a structural diagram of the valve core. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figures 2-4 As shown, this utility model discloses a buffer cylinder, which includes a cylinder body 1, a piston chamber 7 inside the cylinder body 1, a rear cylinder cover 4 at the rear end of the cylinder body 1, a buffer chamber 5 on the rear cylinder cover 4, the buffer chamber 5 being open at the front end and sealed at the rear end, and the front end of the buffer chamber 5 communicating with the rear end of the piston chamber 7; an oil passage 3 is provided on the rear cylinder cover 4, and the rear end of the buffer chamber 5 communicating with the external space of the rear cylinder cover 4 through the oil passage 3; The piston chamber 7 is provided with a piston rod 8, a piston 2 and a buffer column 6; The piston 2 is fixedly sleeved on the piston rod 8, and the side wall of the piston 2 contacts the side wall of the piston cavity 7 and can move back and forth within the piston cavity 7. The front end of the buffer column 6 is connected to the rear end face of the piston rod 8. When the piston rod 8 moves toward the rear cylinder head 4, the rear end of the buffer column 6 can extend into the buffer cavity 5. The buffer column 6 has a valve core cavity 606 inside. The front end of the valve core cavity 606 is sealed and the rear end is open. A cavity cover 603 is provided at the rear end opening of the valve core cavity 606. The cavity cover 603 is provided with an oil hole 604, so that the buffer cavity 5 can communicate with the valve core cavity 606 through the oil hole 604. The buffer column 6 has an oil hole 601, which is located near the front end of the buffer column 6, so that the piston chamber 7 can communicate with the valve core chamber 606 through the oil hole 601. A valve core 602 is provided inside the valve core cavity 606. An oil passage 605 is provided on the valve core 602. The first oil hole 604 and the second oil hole 601 can be connected through the oil passage 605. The sidewall of the valve core 602 contacts the sidewall of the valve core cavity 606 and can move back and forth within the valve core cavity 606. When the rear end of the valve core 602 contacts the front end of the cavity cover 603, the front end of the oil hole 604 is sealed by the rear end of the valve core 602.

[0026] Due to the above structure, when the piston rod 8 moves backward and the rear end of the buffer column 6 extends into the buffer chamber 5, the hydraulic oil at the rear end of the piston chamber 7 can enter the front end of the valve core chamber 606 through the oil hole 2 601 under the push of the piston rod 8 and the piston 2. Then, it pushes the valve core 602 to move backward, so that the valve core 602 blocks the oil hole 1 604, so that the hydraulic oil can only flow into the oil passage 3 through the gap between the buffer column 6 and the buffer chamber 5, thereby achieving the buffering effect when the piston rod 8 moves backward. When the piston rod 8 needs to move forward, the hydraulic oil enters the buffer chamber 5 from the oil passage 3, and then the hydraulic oil enters the valve core chamber 606 from the oil hole 1 604, pushing the valve core 602 to move forward. At the same time, the hydraulic oil flows into the piston chamber 7 through the oil passage 605 and the oil hole 2 601, and then applies pressure to the piston 2 and the rear end of the piston rod 8, pushing the piston rod 8 to extend forward quickly.

[0027] Compared with the prior art, the hydraulic oil in the prior art can only act on the rear end of the buffer column 6, resulting in a slow forward extension speed of the piston rod 8. In this invention, the hydraulic oil can act quickly on the rear end of the piston rod 8 and the piston 2. Since the rear end area of ​​the piston rod 8 and the piston 2 is larger than that of the buffer column 6, they can be subjected to greater thrust, thereby ensuring that the piston rod 8 extends outward quickly.

[0028] like Figure 2 , 3 As shown, the central axes of the piston chamber 7, buffer chamber 5, piston rod 8, buffer column 6, valve core 602, valve core chamber 606, and oil hole 604 coincide.

[0029] Furthermore, such as Figure 4As shown, the oil passage 605 is located at the edge of the valve core 602, and the extension direction of the oil passage 605 is consistent with the length direction of the valve core 602; the oil hole 604 is located at the center of the cavity cover 603; when the rear end of the valve core 602 contacts the front end of the cavity cover 603, the rear end of the oil passage 605 is sealed by the edge of the front end of the cavity cover 603, and the front end of the oil hole 604 is sealed by the middle area of ​​the rear end of the valve core 602.

[0030] like Figure 4 As shown, one or more oil passages 605 can be provided. The diameter of the oil passage 605 should be smaller than the diameter of the valve core 602. The oil passage 605 should be as small as possible to ensure that the hydraulic oil entering through oil hole 1 604 or oil hole 2 601 can push the valve core 602 forward or backward. If the oil passage 605 is too large, most of the hydraulic oil may pass directly through the oil passage 605 and then flow directly out through oil hole 1 604 or oil hole 2 601, and the valve core 602 may not be able to move, resulting in the rear end of the valve core 602 not being able to seal oil hole 1 604.

[0031] Furthermore, the oil passage 605 can be an oil passage hole formed at the edge of the valve core 602; the oil passage hole is a through hole. Or as... Figure 4 As shown, the oil passage 605 can be an oil groove formed on the side wall of the valve core 602; the oil groove is a through groove.

[0032] Furthermore, the second oil hole 601 is formed on the side wall of the buffer column 6 and penetrates the side wall of the valve core cavity 606; the diameter of the front end of the valve core 602 is smaller than the diameter of the rear end of the valve core 602. When the front end of the valve core 602 is located at the front end of the valve core cavity 606, a connecting cavity exists between the side wall of the front end of the valve core 602 and the side wall of the valve core cavity 606, so that the second oil hole 601 can communicate with the oil passage 605 through the connecting cavity.

[0033] Because the diameter of the front end of the valve core 602 is smaller than the diameter of the rear end of the valve core 602, it can prevent the oil hole 601 from being blocked by the front end of the valve core 602 when the valve core 602 is located at the front end of the valve core cavity 606. This ensures that when the hydraulic oil enters from the oil hole 601, the valve core 602 can move backward smoothly. At the same time, it ensures that when the hydraulic oil enters from the oil hole 604, it can smoothly pass through the oil passage 605 and the oil hole 601 to enter the piston cavity 7.

[0034] Furthermore, such as Figure 4 , 5As shown, the valve core 602 includes a columnar valve core front section 6021 and a valve core rear section 6022. The diameter of the valve core front section 6021 is smaller than the diameter of the valve core rear section 6022. The sidewall of the valve core rear section 6022 contacts the sidewall of the valve core cavity 606. The oil passage 605 is opened at the edge of the valve core rear section 6022 and passes through the front and rear ends of the valve core rear section 6022.

[0035] Furthermore, such as Figure 4 , 5 As shown, the front end face of the valve core cavity 606 is a plane, and the front end face of the valve core front section 6021 is a spherical surface.

[0036] If the front end face of the valve core 6021 is flat, when the valve core 602 is located at the front end of the valve core cavity 606, the front end face of the valve core cavity 606 will be in contact with the front end face of the valve core 6021. The hydraulic oil entering through the second oil hole 601 will only act on the front end face of the rear valve core 6022, and will not contribute to the rearward movement of the valve core 602. However, when the front end face of the valve core 6021 is spherical, the hydraulic oil can act on the spherical surface, allowing the hydraulic oil to act on both the front end face and the rear end face of the valve core 602, thus facilitating the rearward movement of the valve core 602.

[0037] Furthermore, the second oil hole 601 is formed on the side wall of the buffer column 6 and penetrates the side wall of the valve core cavity 606; when the front end face of the valve core front section 6021 contacts the front end face of the valve core cavity 606, the position of the second oil hole 601 is within the length range of the valve core front section 6021. This allows oil to enter the communicating cavity and prevents the second oil hole 601 from being blocked by the valve core 602.

[0038] Furthermore, the front end of the buffer cavity 5 is chamfered, which makes the front end opening of the buffer cavity 5 open outward.

[0039] Furthermore, when all the buffer pillars 6 are located within the buffer cavity 5, the second oil hole 601 is located at the chamfered end of the buffer cavity 5. The chamfer prevents the buffer cavity 5 from blocking the second oil hole 601.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A buffer cylinder, characterized in that: It includes a cylinder body (1), a piston chamber (7) is provided inside the cylinder body (1), a rear cylinder head (4) is provided at the rear end of the cylinder body (1), a buffer chamber (5) is provided on the rear cylinder head (4), the front end of the buffer chamber (5) is open and the rear end is sealed, and the front end of the buffer chamber (5) is connected to the rear end of the piston chamber (7); an oil passage (3) is provided on the rear cylinder head (4), and the rear end of the buffer chamber (5) is connected to the external space of the rear cylinder head (4) through the oil passage (3); The piston chamber (7) is provided with a piston rod (8), a piston (2) and a buffer column (6). The piston (2) is fixedly sleeved on the piston rod (8), and the side wall of the piston (2) contacts the side wall of the piston cavity (7) and can move back and forth in the piston cavity (7); The front end of the buffer column (6) is connected to the rear end face of the piston rod (8). When the piston rod (8) moves toward the rear cylinder head (4), the rear end of the buffer column (6) can extend into the buffer cavity (5). The buffer column (6) has a valve core cavity (606) inside. The front end of the valve core cavity (606) is sealed and the rear end is open. A cavity cover (603) is provided at the rear end opening of the valve core cavity (606). The cavity cover (603) is provided with an oil hole (604) so ​​that the buffer cavity (5) can communicate with the valve core cavity (606) through the oil hole (604); The buffer column (6) is provided with an oil hole 2 (601), which is close to the front end of the buffer column (6), so that the piston chamber (7) can communicate with the valve core chamber (606) through the oil hole 2 (601); The valve core cavity (606) is provided with a valve core (602), and an oil passage (605) is provided on the valve core (602). The first oil hole (604) and the second oil hole (601) can be connected through the oil passage (605). The sidewall of the valve core (602) contacts the sidewall of the valve core cavity (606) and can move back and forth in the valve core cavity (606). When the rear end of the valve core (602) contacts the front end of the cavity cover (603), the front end of the oil hole (604) is sealed by the rear end of the valve core (602).

2. The buffer cylinder according to claim 1, characterized in that: The oil passage (605) is located at the edge of the valve core (602), and the extension direction of the oil passage (605) is consistent with the length direction of the valve core (602); the first oil hole (604) is located at the center of the cavity cover (603); when the rear end of the valve core (602) contacts the front end of the cavity cover (603), the rear end of the oil passage (605) is sealed by the edge of the front end of the cavity cover (603), and the front end of the first oil hole (604) is sealed by the middle area of ​​the rear end of the valve core (602).

3. The buffer cylinder according to claim 2, characterized in that: The oil passage (605) is an oil passage hole opened at the edge of the valve core (602); the oil passage hole is a through hole.

4. The buffer cylinder according to claim 2, characterized in that: The oil passage (605) is an oil groove formed on the side wall of the valve core (602); the oil groove is a through groove.

5. The buffer cylinder according to claim 2, characterized in that: The second oil hole (601) is opened on the side wall of the buffer column (6) and penetrates the side wall of the valve core cavity (606); the diameter of the front end of the valve core (602) is smaller than the diameter of the rear end of the valve core (602). When the front end of the valve core (602) is located at the front end of the valve core cavity (606), there is a connecting cavity between the side wall of the front end of the valve core (602) and the side wall of the valve core cavity (606), so that the second oil hole (601) can be connected to the oil passage (605) through the connecting cavity.

6. The buffer cylinder according to claim 5, characterized in that: The valve core (602) includes a columnar valve core front section (6021) and a valve core rear section (6022). The diameter of the valve core front section (6021) is smaller than the diameter of the valve core rear section (6022). The sidewall of the valve core rear section (6022) contacts the sidewall of the valve core cavity (606). The oil passage (605) is opened at the edge of the valve core rear section (6022) and passes through the front and rear ends of the valve core rear section (6022).

7. The buffer cylinder according to claim 6, characterized in that: The front end face of the valve core cavity (606) is a plane, and the front end face of the valve core front section (6021) is a spherical surface.

8. The buffer cylinder according to claim 6, characterized in that: When the front end face of the valve core front section (6021) contacts the front end face of the valve core cavity (606), the position of the second oil hole (601) is within the length range of the valve core front section (6021).

9. The buffer cylinder according to claim 8, characterized in that: The front end of the buffer cavity (5) is chamfered, and the chamfer makes the front end opening of the buffer cavity (5) open outward.

10. The buffer cylinder according to claim 9, characterized in that: When all the buffer columns (6) are located inside the buffer cavity (5), the second oil hole (601) is located at the chamfer at the front end of the buffer cavity (5).

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