A hydraulic cylinder adjustable buffer device

Abstract

The utility model discloses a kind of adjustable hydraulic oil cylinder buffer devices, to provide a kind of adjustable hydraulic oil cylinder buffer device, which is not only good in buffering effect, buffering effect is stable, can effectively improve the buffering effect consistency of batch production oil cylinder;And can be adjusted according to actual needs to the buffering effect of oil cylinder, a kind of adjustable hydraulic oil cylinder buffer device. It includes buffer assembly, is located in the cylinder barrel end of hydraulic oil cylinder, and buffer assembly includes: oil hole and throttle hole, are located on the cylinder barrel side wall and are communicated with cylinder barrel inner chamber, throttle hole and cylinder end face are located at the same side of oil hole;Adjusting valve stem is screw-connected on hydraulic oil cylinder, adjusting valve stem and throttle hole coaxially distribute, adjusting valve stem one end surface is equipped with oil passing hole, at least one throttling gap is equipped on the inner wall of oil passing hole, throttling gap extends along adjusting valve stem axial direction and is communicated with the outside surface of adjusting valve stem, and the adjusting valve stem one end where oil passing hole is located extends into throttle hole.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder buffer technology, specifically to an adjustable buffer device for hydraulic cylinders. Background Technology

[0002] Currently, hydraulic cylinder buffers are generally clearance buffers, with a typical design clearance of 0.05mm. However, the design clearance of a hydraulic cylinder buffer is not fixed. In practical applications, the size of the buffer clearance needs to be comprehensively considered in the design, taking into account key parameters such as the cylinder diameter, rod diameter, and the force on the piston rod, as well as the required buffer time. For example, Chinese Patent Publication No. CN104074837A, a utility model invention entitled "Buffer Cylinder," includes a cylinder barrel, cylinder head, piston, and piston rod. A buffer sleeve is fitted on the piston rod, with a clearance fit between the buffer sleeve and the piston rod, and a clearance fit between the buffer sleeve and the buffer hole in the cylinder head.

[0003] The gap buffer currently used for hydraulic cylinder buffering has the following shortcomings. Firstly, the buffer clearance of the hydraulic cylinder requires very high machining precision. Due to machining precision issues, the actual size of the buffer clearance can vary greatly, resulting in poor consistency and significant fluctuations in the buffering effect. In the same batch of hydraulic cylinders, some have good buffering while others have no buffering at all. This not only affects the quality stability of the hydraulic cylinders but also increases the production difficulty of the hydraulic cylinders during mass production.

[0004] Secondly, the buffering effect of the hydraulic cylinder cannot be adjusted according to actual needs. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable buffer device for hydraulic cylinders that not only has a good and stable buffering effect, effectively improving the consistency of buffering effect in mass-produced hydraulic cylinders, but also allows for adjustment of the buffering effect of the hydraulic cylinder according to actual needs.

[0006] The technical solution of this utility model is: An adjustable buffer device for a hydraulic cylinder includes a buffer assembly disposed at the end of the cylinder barrel of the hydraulic cylinder. The buffer assembly includes: Both the oil passage hole and the throttle hole are located on the side wall of the cylinder and communicate with the inner cavity of the cylinder. The throttle hole and the end face of the cylinder are located on the same side as the oil passage hole. An adjusting valve stem, threadedly connected to a hydraulic cylinder, is coaxially distributed with a throttling orifice. One end face of the adjusting valve stem has an oil passage hole, and the inner wall of the oil passage hole has at least one throttling gap. The throttling gap extends axially along the adjusting valve stem and connects to the outer surface of the adjusting valve stem. The end of the adjusting valve stem containing the oil passage hole extends into the throttling orifice. The specific operation of an adjustable buffer device for a hydraulic cylinder according to this solution is as follows. During the piston movement of the hydraulic cylinder, as the piston approaches the cylinder end where the buffer assembly is located, the buffer assembly provides different buffering effects. When the oil passage and throttle orifice of the buffer assembly are on the same side of the piston (the oil passage is not blocked by the piston), the hydraulic fluid in the cylinder can flow out simultaneously through the oil passage, throttle orifice, and throttle gap, providing a buffering effect on the piston. During this process, the buffering damping is relatively small, providing initial buffering of the cylinder and initially reducing the piston speed. As the piston approaches the cylinder end, the oil passage is gradually blocked by the piston until it is completely blocked. During this process, the buffering damping of the cylinder gradually decreases, and the buffering effect gradually strengthens, gradually reducing the piston speed. After the piston completely blocks the oil passage, the hydraulic fluid in the cylinder only flows out through the throttle orifice and throttle gap. The buffering damping of the cylinder reaches its maximum, further reducing the piston speed. The buffering effect is significant and effective. Furthermore, when the piston starts, hydraulic fluid can enter through the throttle gap and throttle orifice, achieving rapid starting hydraulic fluid flow and preventing piston jamming.

[0007] On the other hand, the size of the throttling gap outside the throttling orifice can be adjusted by tightening or loosening the adjusting valve stem, thereby regulating the buffering effect of the hydraulic cylinder. The smaller the throttling gap outside the throttling orifice, the greater the buffering damping, and the stronger the corresponding buffering effect. Thus, before leaving the factory, the buffering effect of the hydraulic cylinder can be adjusted by adjusting the valve stem, ensuring that the buffering effect of the batch-produced cylinders is within a set range, thereby guaranteeing stable buffering effect and effectively improving the consistency of the buffering effect of batch-produced cylinders. Furthermore, the buffering effect of the cylinder can be adjusted by adjusting the valve stem according to actual needs to meet different buffering requirements.

[0008] Preferably, the buffer assembly also includes a connecting seat, which is sealed to the side wall of the cylinder. The connecting seat has a communicating oil groove and an external interface. The regulating valve stem is threaded onto the connecting seat, and both the oil passage hole and the throttle hole are connected to the communicating oil groove. This facilitates the actual production and manufacturing of the buffer assembly.

[0009] Preferably, the connecting oil groove is located on the side of the connecting seat facing the cylinder, and one end of the oil passage hole and the throttling hole is connected to the groove opening of the connecting oil groove. This facilitates the actual processing and manufacturing of the connecting oil groove.

[0010] Preferably, the buffer assembly also includes a valve stem nut, which is threaded onto the adjusting valve stem, locking the adjusting valve stem securely to the connecting seat. In this way, the adjusting valve stem can be locked and fixed to the connecting seat by the valve stem nut, thereby ensuring the stability of the adjusting valve stem position and preventing fluctuations in the buffering effect of the hydraulic cylinder caused by loosening of the adjusting valve stem.

[0011] Preferably, the piston of the hydraulic cylinder is equipped with a sealing ring and two piston rings. The sealing ring is located between the two piston rings. When the piston abuts against one end of the cylinder containing the buffer assembly, one piston ring is positioned between the oil passage and the throttle orifice of the buffer assembly, with the oil passage and the throttle orifice on the same side of the sealing ring. The piston ring prevents the piston from scoring the cylinder bore during movement and provides a certain degree of sealing. When the piston ring is positioned between the oil passage and the throttle orifice of the buffer assembly, the oil passage is blocked by the piston, and the hydraulic fluid in the cylinder flows out only through the throttle orifice and the throttle gap. The cylinder's buffering damping reaches its maximum, resulting in a significant and effective buffering effect, further reducing the piston speed.

[0012] Preferably, the two piston rings are symmetrically distributed on both sides of the sealing ring. This facilitates actual manufacturing.

[0013] Preferably, a clearance fit is used between the regulating valve stem and the throttling orifice, or a sliding seal fit is used between the regulating valve stem and the throttling orifice.

[0014] Preferably, there are multiple throttling gaps, and each throttling gap is evenly distributed around the circumference of the regulating valve stem.

[0015] Preferably, the cylinder is equipped with the aforementioned buffer components at both ends. This ensures a buffering effect as the piston moves to both ends of the hydraulic cylinder, achieving buffering in both chambers of the hydraulic cylinder (the chambers on either side of the piston).

[0016] The beneficial effects of this utility model are: Firstly, as the piston approaches the cylinder end where the buffer assembly is located, the buffer assembly can gradually enhance the buffering effect, resulting in a significant and effective buffering effect.

[0017] Secondly, by tightening or loosening the adjusting valve stem, the size of the throttling gap outside the throttling orifice can be adjusted, thereby regulating the buffering effect of the hydraulic cylinder. This allows the buffering effect of the hydraulic cylinder to be adjusted before leaving the factory, ensuring that the buffering effect of cylinders produced in batches is within a set range, thus guaranteeing stable buffering performance and effectively improving the consistency of buffering effect across batches. Furthermore, the buffering effect of the cylinder can be further adjusted by adjusting the valve stem according to actual needs.

[0018] Thirdly, when the piston starts, the oil can enter through the throttling gap and throttling orifice, achieving the purpose of rapid start-up. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional structural diagram of an adjustable buffer device for a hydraulic cylinder according to this utility model.

[0020] Figure 2 yes Figure 1A magnified view of a portion of point A in the middle.

[0021] In the picture: Buffer assembly 1, oil passage hole 1.1, throttle hole 1.2, regulating valve stem 1.3, connecting seat 1.4, external interface 1.5, connecting oil groove 1.6, valve stem nut 1.7, oil passage hole 1.8, throttle gap 1.9; Cylinder 2; Piston 3; Sealing ring 4; Piston ring 5. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, an adjustable buffer device for a hydraulic cylinder includes a buffer assembly 1. The buffer assembly 1 is located at the end of the cylinder barrel 2 of the hydraulic cylinder.

[0023] The buffer assembly 1 includes an oil passage 1.1, a throttle orifice 1.2, and a regulating valve stem 1.3. Both the oil passage 1.1 and the throttle orifice 1.2 are located on the side wall of the cylinder 2. Both the oil passage 1.1 and the throttle orifice 1.2 communicate with the inner cavity of the cylinder 2. The throttle orifice 1.2 and the end face of the cylinder 2 are located on the same side as the oil passage 1.1.

[0024] The regulating valve stem 1.3 is threaded onto the hydraulic cylinder. The regulating valve stem 1.3 is coaxially distributed with the throttle orifice 1.2. One end face of the regulating valve stem 1.3 has an oil passage hole 1.8. At least one throttle gap 1.9 is provided on the inner wall of the oil passage hole 1.8. The throttle gap 1.9 extends axially along the regulating valve stem 1.3 and connects to the outer surface of the regulating valve stem 1.3. One end of the regulating valve stem 1.3, where the oil passage hole 1.8 is located, extends into the throttle orifice 1.2.

[0025] The specific operation of the adjustable hydraulic cylinder buffer device in this embodiment is as follows: During the movement of piston 3 in the hydraulic cylinder, as piston 3 approaches the end of cylinder 2 where buffer assembly 1 is located, buffer assembly 1 can provide different buffering effects. Specifically, when the oil passage 1.1 and throttle orifice 1.2 of buffer assembly 1 are located on the same side of piston 3 (oil passage 1.1 is not blocked by piston 3), the hydraulic fluid in the cylinder can simultaneously flow out through oil passage 1.1, throttle orifice 1.2, and throttle gap 1.9, providing a buffering effect on piston 3. During this process, the buffering damping is relatively small, providing initial support to the hydraulic cylinder. The system initially reduces the speed of piston 3 by buffering. As piston 3 approaches the end of cylinder 2, the oil passage 1.1 is gradually blocked by piston 3 until it completely blocks the passage. During this process, the buffering damping of the cylinder gradually decreases, the buffering effect gradually strengthens, and the speed of piston 3 is gradually reduced. After piston 3 completely blocks the oil passage 1.1, the oil in the cylinder flows out only through the throttling orifice 1.2 and the throttling gap 1.9. The buffering damping of the cylinder reaches its maximum, further reducing the speed of piston 3. The buffering effect is significant and effective. In addition, when piston 3 starts, oil can enter through the throttling gap 1.9 and the throttling orifice 1.2, achieving the purpose of rapid starting oil and preventing piston jamming.

[0026] On the other hand, the size of the throttling gap 1.9 outside the throttling orifice 1.2 can be adjusted by tightening or loosening the adjusting valve stem 1.3, thereby adjusting the buffering effect of the hydraulic cylinder. The smaller the throttling gap 1.9 outside the throttling orifice 1.2, the greater the buffering damping, and the stronger the corresponding buffering effect. Thus, before leaving the factory, the buffering effect of the hydraulic cylinder can be adjusted by adjusting the valve stem 1.3 to ensure that the buffering effect of the batch-produced cylinders is within the set range, thereby ensuring stable buffering effect and effectively improving the consistency of buffering effect of batch-produced cylinders. In addition, the buffering effect of the cylinder can also be adjusted by adjusting the valve stem 1.3 according to actual needs to meet different buffering requirements.

[0027] Specific embodiment two, such as Figure 1 , Figure 2 As shown, an adjustable buffer device for a hydraulic cylinder includes a buffer assembly 1. The buffer assembly 1 is located at the end of the cylinder barrel 2 of the hydraulic cylinder.

[0028] The buffer assembly 1 includes an oil passage 1.1, a throttle orifice 1.2, an adjusting valve stem 1.3, and a connecting seat 1.4. Both the oil passage 1.1 and the throttle orifice 1.2 are located on the side wall of the cylinder 2. Both the oil passage 1.1 and the throttle orifice 1.2 communicate with the inner cavity of the cylinder 2. The throttle orifice 1.2 and the end face of the cylinder 2 are located on the same side as the oil passage 1.1.

[0029] The connecting seat 1.4 is sealed to the side wall of the cylinder 2. The connecting seat 1.4 has a connecting oil groove 1.6 and an external interface 1.5, which is located on the outer surface of the connecting seat 1.4 and connected to the connecting oil groove 1.6. The external interface 1.5 is used to connect external oil pipes. Both the oil passage hole 1.1 and the throttle hole 1.2 are connected to the connecting oil groove 1.6.

[0030] In one example, the connecting seat 1.4 is welded to the side wall of the cylinder 2. The edge of the connecting seat 1.4 is connected to the cylinder 2 by a fully welded circumferential weld, so that the connecting seat 1.4 is sealed to the side wall of the cylinder 2. The oil passage 1.1 and the throttle hole 1.2 are located within the circumferential weld.

[0031] In another example, the connecting seat 1.4 is bolted to the side wall of the cylinder 2, and an annular sealing ring is provided between the connecting seat 1.4 and the cylinder 2 to seal the connecting seat 1.4 to the side wall of the cylinder 2. The connecting oil groove 1.6 is located inside the annular sealing ring. The oil passage 1.1 and the throttle hole 1.2 are located inside the annular sealing ring.

[0032] The regulating valve stem 1.3 is threaded onto the hydraulic cylinder. In this embodiment, the regulating valve stem 1.3 is threaded onto the connecting seat 1.4. The regulating valve stem 1.3 is coaxially distributed with the throttling orifice 1.2. One end face of the regulating valve stem 1.3 is provided with an oil passage hole 1.8. At least one throttling gap 1.9 is provided on the inner wall of the oil passage hole 1.8. The throttling gap 1.9 extends axially along the regulating valve stem 1.3 and communicates with the outer surface of the regulating valve stem 1.3. One end of the regulating valve stem 1.3, where the oil passage hole 1.8 is located, extends into the throttling orifice 1.2.

[0033] The specific operation of the adjustable hydraulic cylinder buffer device in this embodiment is as follows: During the movement of piston 3 in the hydraulic cylinder, as piston 3 approaches the end of cylinder 2 where buffer assembly 1 is located, buffer assembly 1 can provide different buffering effects. Specifically, when the oil passage 1.1 and throttle orifice 1.2 of buffer assembly 1 are located on the same side of piston 3 (oil passage 1.1 is not blocked by piston 3), the hydraulic oil in the cylinder can simultaneously flow out through oil passage 1.1, throttle orifice 1.2, and throttle gap 1.9, and then flow out through connecting oil groove 1.6 and external interface 1.5, providing a buffering effect on piston 3. During this process, the buffering damping is relatively small, providing initial buffering for the hydraulic cylinder. The system initially reduces the speed of piston 3 by buffering. As piston 3 approaches the end of cylinder 2, the oil passage 1.1 is gradually blocked by piston 3 until it completely blocks the passage. During this process, the buffering damping of the cylinder gradually decreases, the buffering effect gradually strengthens, and the speed of piston 3 is gradually reduced. After piston 3 completely blocks the oil passage 1.1, the oil in the cylinder flows out only through the throttling orifice 1.2 and the throttling gap 1.9, and then flows out through the connecting oil groove 1.6 and the external interface 1.5. The buffering damping of the cylinder reaches its maximum, further reducing the speed of piston 3. The buffering effect is significant and effective. In addition, when piston 3 starts, oil can enter through the throttling gap 1.9 and the throttling orifice 1.2 to achieve the purpose of rapid starting oil operation without causing piston jamming.

[0034] On the other hand, the size of the throttling gap 1.9 outside the throttling orifice 1.2 can be adjusted by tightening or loosening the adjusting valve stem 1.3, thereby adjusting the buffering effect of the hydraulic cylinder. The smaller the throttling gap 1.9 outside the throttling orifice 1.2, the greater the buffering damping, and the stronger the corresponding buffering effect. Thus, before leaving the factory, the buffering effect of the hydraulic cylinder can be adjusted by adjusting the valve stem 1.3 to ensure that the buffering effect of the batch-produced cylinders is within the set range, thereby ensuring stable buffering effect and effectively improving the consistency of buffering effect of batch-produced cylinders. In addition, the buffering effect of the cylinder can also be adjusted by adjusting the valve stem 1.3 according to actual needs to meet different buffering requirements.

[0035] Specific embodiment three, such as Figure 1 , Figure 2 As shown, an adjustable buffer device for a hydraulic cylinder includes a buffer assembly 1. The buffer assembly 1 is located at the end of the cylinder barrel 2 of the hydraulic cylinder.

[0036] The buffer assembly 1 includes an oil passage 1.1, a throttle orifice 1.2, an adjusting valve stem 1.3, a valve stem nut 1.7, and a connecting seat 1.4. Both the oil passage 1.1 and the throttle orifice 1.2 are located on the side wall of the cylinder 2. Both the oil passage 1.1 and the throttle orifice 1.2 communicate with the inner cavity of the cylinder 2. The throttle orifice 1.2 and the end face of the cylinder 2 are located on the same side as the oil passage 1.1. In this embodiment, the oil passage 1.1 and the throttle orifice 1.2 are machined, for example, by reaming with a reamer, which can effectively ensure the tolerances of the oil passage 1.1 and the throttle orifice 1.2.

[0037] The connecting seat 1.4 is sealed to the side wall of the cylinder 2. The connecting seat 1.4 has a connecting oil groove 1.6 and an external interface 1.5. The external interface 1.5 is located on the outer side of the connecting seat 1.4 and is connected to the connecting oil groove 1.6. The external interface 1.5 is used to connect external oil pipes. The oil passage hole 1.1 and the throttle hole 1.2 are both connected to the connecting oil groove 1.6. In this embodiment, the connecting oil groove 1.6 is located on the side of the connecting seat 1.4 facing the cylinder 2. One end of the connecting oil groove 1.6 is closed, and the other end is connected to the external interface 1.5. One end of the oil passage hole 1.1 and the throttle hole 1.2 are connected to the opening of the connecting oil groove 1.6.

[0038] In one example, the connecting seat 1.4 is welded to the side wall of the cylinder 2, and the edge of the connecting seat 1.4 is connected to the cylinder 2 by a fully welded circumferential weld, so that the connecting seat 1.4 is sealed to the side wall of the cylinder 2. The oil passage 1.1 and the throttle orifice 1.2 are located within the circumferential weld.

[0039] In another example, the connecting seat 1.4 is bolted to the side wall of the cylinder 2, and an annular sealing ring is provided between the connecting seat 1.4 and the cylinder 2 to seal the connecting seat 1.4 to the side wall of the cylinder 2. The connecting oil groove 1.6 is located inside the annular sealing ring. The oil passage 1.1 and the throttle hole 1.2 are located inside the annular sealing ring.

[0040] The regulating valve stem 1.3 is threaded onto the hydraulic cylinder. In this embodiment, the regulating valve stem 1.3 is threaded onto the connecting seat 1.4. Specifically, the connecting seat 1.4 has a threaded hole that communicates with the connecting oil groove 1.6. The regulating valve stem 1.3 and the threaded hole are connected by a threaded seal. The regulating valve stem 1.3 and the throttle orifice 1.2 are coaxially distributed. One end face of the regulating valve stem 1.3 has an oil passage hole 1.8. The end of the regulating valve stem 1.3 with the oil passage hole 1.8 extends into the throttle orifice 1.2.

[0041] In one example, a clearance fit is used between the regulating valve stem 1.3 and the throttle orifice 1.2.

[0042] In another example, a sliding seal is used between the regulating valve stem 1.3 and the throttle orifice 1.2.

[0043] At least one throttling gap 1.9 is provided on the inner wall of the oil passage 1.8. The throttling gap 1.9 extends axially along the regulating valve stem 1.3 and communicates with the outer surface of the regulating valve stem 1.3. There are one or more throttling gaps 1.9. In this embodiment, there are multiple throttling gaps 1.9, for example, there are 2-4 throttling gaps 1.9, and each throttling gap 1.9 is evenly distributed around the regulating valve stem 1.3.

[0044] The valve stem nut 1.7 is threaded onto the regulating valve stem 1.3, locking the regulating valve stem 1.3 securely to the connecting seat 1.4. This secures the regulating valve stem 1.3 to the connecting seat 1.4, ensuring the stability of the regulating valve stem 1.3's position and preventing it from loosening, which could cause fluctuations in the cylinder's buffering effect.

[0045] In this embodiment, the buffer assembly 1 is provided at both ends of the cylinder 2. It can provide a buffering effect when the piston 3 moves to both ends of the hydraulic cylinder, so that both chambers of the hydraulic cylinder (the chambers on both sides of the piston 3) are buffered.

[0046] The piston 3 of the hydraulic cylinder is equipped with a sealing ring 4 and two piston rings 5. The sealing ring 4 is located between the two piston rings 5. In this embodiment, the two piston rings 5 ​​are symmetrically distributed on both sides of the sealing ring 4. When the piston 3 abuts against one end of the cylinder 2 where the buffer assembly 1 is located, one of the piston rings 5 ​​is located between the oil passage 1.1 and the throttle orifice 1.2 of the buffer assembly 1, and the oil passage 1.1 and the throttle orifice 1.2 of the buffer assembly 1 are located on the same side of the sealing ring 4. The piston ring 5 prevents the piston 3 from damaging the inner bore of the cylinder 2 when it moves, and also has a certain sealing effect. When the piston ring 5 is located between the oil passage 1.1 and the throttle orifice 1.2 of the buffer assembly 1, the oil passage 1.1 is blocked by the piston 3, and the oil in the cylinder flows out only through the throttle orifice 1.2 and the throttle gap 1.9. The buffer damping of the cylinder reaches its maximum, the buffering effect is obvious and good, and the piston speed is further reduced.

[0047] The specific operation of the adjustable hydraulic cylinder buffer device in this embodiment is as follows: During the movement of piston 3 in the hydraulic cylinder, as piston 3 approaches the end of cylinder 2 where buffer assembly 1 is located, buffer assembly 1 can provide different buffering effects. Specifically, when the oil passage 1.1 and throttle orifice 1.2 of buffer assembly 1 are located on the same side of piston 3 (oil passage 1.1 is not blocked by piston 3), the hydraulic oil in the cylinder can simultaneously flow out through oil passage 1.1, throttle orifice 1.2, and throttle gap 1.9, and then flow out through connecting oil groove 1.6 and external interface 1.5, providing a buffering effect on piston 3. During this process, the buffering damping is relatively small, providing initial buffering for the hydraulic cylinder. The system initially reduces the speed of piston 3 by buffering. As piston 3 approaches the end of cylinder 2, the oil passage 1.1 is gradually blocked by piston 3 until it completely blocks the passage. During this process, the buffering damping of the cylinder gradually decreases, the buffering effect gradually strengthens, and the speed of piston 3 is gradually reduced. After piston 3 completely blocks the oil passage 1.1, the oil in the cylinder flows out only through the throttling orifice 1.2 and the throttling gap 1.9, and then flows out through the connecting oil groove 1.6 and the external interface 1.5. The buffering damping of the cylinder reaches its maximum, further reducing the speed of piston 3. The buffering effect is significant and effective. In addition, when piston 3 starts, oil can enter through the throttling gap 1.9 and the throttling orifice 1.2 to achieve the purpose of rapid starting oil operation without causing piston jamming.

[0048] On the other hand, the size of the throttling gap 1.9 outside the throttling orifice 1.2 can be adjusted by tightening or loosening the adjusting valve stem 1.3, thereby adjusting the buffering effect of the hydraulic cylinder. The smaller the throttling gap 1.9 outside the throttling orifice 1.2, the greater the buffering damping, and the stronger the corresponding buffering effect. Thus, before leaving the factory, the buffering effect of the hydraulic cylinder can be adjusted by adjusting the valve stem 1.3 to ensure that the buffering effect of the batch-produced cylinders is within the set range, thereby ensuring stable buffering effect and effectively improving the consistency of buffering effect of batch-produced cylinders. In addition, the buffering effect of the cylinder can also be adjusted by adjusting the valve stem 1.3 according to actual needs to meet different buffering requirements.

[0049] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. An adjustable buffer device for a hydraulic cylinder, characterized in that, Includes a buffer assembly located at the end of the cylinder barrel of the hydraulic cylinder. The buffer assembly includes: Both the oil passage hole and the throttle hole are located on the side wall of the cylinder and communicate with the inner cavity of the cylinder. The throttle hole and the end face of the cylinder are located on the same side as the oil passage hole. The regulating valve stem is threaded onto the hydraulic cylinder. The regulating valve stem is coaxially distributed with the throttling orifice. One end face of the regulating valve stem is provided with an oil passage hole. The inner wall of the oil passage hole is provided with at least one throttling gap. The throttling gap extends axially along the regulating valve stem and connects to the outer side of the regulating valve stem. One end of the regulating valve stem where the oil passage hole is located extends into the throttling orifice.

2. The adjustable buffer device for a hydraulic cylinder according to claim 1, characterized in that, The buffer assembly also includes a connecting seat, which is sealed to the side wall of the cylinder. The connecting seat has a communicating oil groove and an external interface. The regulating valve stem is threaded to the connecting seat, and the oil passage hole and the throttle hole are both connected to the communicating oil groove.

3. The adjustable buffer device for a hydraulic cylinder according to claim 2, characterized in that, The connecting oil groove is located on the side of the connecting seat facing the cylinder, and one end of the oil passage hole and the throttle hole are connected to the groove opening of the connecting oil groove.

4. An adjustable buffer device for a hydraulic cylinder according to claim 2 or 3, characterized in that, The buffer assembly also includes a valve stem nut, which is threaded onto the regulating valve stem to lock and fix the regulating valve stem onto the connecting seat.

5. An adjustable buffer device for a hydraulic cylinder according to claim 1, 2, or 3, characterized in that, The piston of the hydraulic cylinder is equipped with a sealing ring and two piston rings. The sealing ring is located between the two piston rings. When the piston abuts against one end of the cylinder where the buffer assembly is located, one of the piston rings is located between the oil passage hole and the throttle hole of the buffer assembly, and the oil passage hole and the throttle hole of the buffer assembly are located on the same side of the sealing ring.

6. The adjustable buffer device for a hydraulic cylinder according to claim 5, characterized in that, The two piston rings are symmetrically distributed on both sides of the sealing ring.

7. An adjustable buffer device for a hydraulic cylinder according to claim 1, 2, or 3, characterized in that, The regulating valve stem and the throttling orifice are fitted with a clearance fit, or the regulating valve stem and the throttling orifice are fitted with a sliding seal fit.

8. An adjustable buffer device for a hydraulic cylinder according to claim 1, 2, or 3, characterized in that, There are multiple throttling gaps, and each throttling gap is evenly distributed around the circumference of the regulating valve stem.

9. An adjustable buffer device for a hydraulic cylinder according to claim 1, 2, or 3, characterized in that, The cylinder is equipped with the aforementioned buffer assembly at both ends.

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