Plunger type cylinder one-way buffering structure

Abstract

The utility model discloses a one-way buffer structure of a plunger cylinder, which comprises a cylinder barrel, a cylinder bottom and a guide sleeve are respectively mounted at two ends of the cylinder barrel, a plunger assembly is fittingly arranged in the cylinder barrel, and when driven by external force, the plunger assembly moves relative to the cylinder barrel and is connected with a plunger rod. The plunger assembly comprises a plunger body and a valve hole formed in the plunger body, an oil supplementing hole is further formed in the surface of the plunger body and communicated with the cylinder barrel and the valve hole, a throttling valve is arranged on the opening side, close to the cylinder bottom, of the valve hole, a throttling hole is formed in the throttling valve and penetrates through the two sides of the throttling valve, and a steel ball is arranged in the valve hole. The plunger piston is simple in structure, the steel ball and the throttling valve are integrally designed in the plunger piston body, the space compactness of the structure is achieved, the assembling process is simplified, the assembling efficiency is improved, it is ensured that the response speed of the device is higher, and the plunger piston can rapidly adapt to the change of the working state.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a one-way buffer structure for a piston cylinder. Background Technology

[0002] Hydraulic cylinders, as key actuators widely used in industrial production and engineering machinery, directly affect the overall working efficiency and safety of equipment. In actual use, due to the working characteristics of hydraulic cylinders—rapid piston extension or retraction—at the end of the stroke, the piston or piston rod comes into direct mechanical contact with components such as the cylinder guide sleeve and cylinder bottom, generating significant impact loads. This impact not only causes strong vibrations and noise, severely affecting the operator's working environment, but can also damage the cylinder itself, reducing its service life, or even causing complete cylinder malfunction.

[0003] To address the aforementioned issues, traditional hydraulic cylinders typically incorporate buffer devices in their design to reduce or absorb impact energy. In traditional buffer device designs, the throttle orifice and check valve are separate components. Specifically, the throttle orifice is located on the piston rod, while the check valve is integrated inside the piston, achieved through a steel ball, spring, and valve hole on the piston. However, this design has significant drawbacks: firstly, due to the long and large diameter of the piston rod, precise machining of the throttle orifice is difficult and complex, resulting in low production efficiency and high manufacturing costs; secondly, the integrated design of the check valve requires additional valve hole machining on the piston, which also presents challenges in machining difficulty and cost. Moreover, to meet specific design requirements, specialized machining tools are often needed. Therefore, a piston cylinder one-way buffer structure is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a one-way buffer structure for a plunger cylinder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a one-way buffer structure for a plunger cylinder, comprising a cylinder barrel, with a cylinder bottom and a guide sleeve respectively installed at both ends of the cylinder barrel. A plunger assembly is fitted inside the cylinder barrel. When driven by an external force, the plunger assembly moves relative to the cylinder barrel. The plunger assembly is connected to a plunger rod. The plunger assembly includes a plunger body and a valve hole opened inside the plunger body. The surface of the plunger body is also provided with an oil filling hole, which connects the cylinder barrel and the valve hole. A throttle valve is provided on the opening side of the valve hole near the cylinder bottom. A throttle orifice is opened on the throttle valve, and the throttle orifice passes through both sides of the throttle valve. A steel ball is provided inside the valve hole.

[0006] As a further embodiment of this utility model: an oil inlet hole is provided on the bottom of the cylinder, and the oil inlet hole is connected to the inside of the cylinder barrel.

[0007] As a further embodiment of this utility model, a fixing seat is installed on the outer circumferential surface of the cylinder.

[0008] As a further embodiment of this utility model: the plunger body has an annular groove along its outer circumferential surface, and a sealing ring is provided inside the annular groove.

[0009] As a further embodiment of this utility model: an oil cavity is provided at the end of the plunger rod near the plunger body, and an oil hole communicating with the oil cavity is provided on the surface of the plunger rod.

[0010] As a further embodiment of this utility model: the plunger body and the plunger rod are connected by threads, and a set screw is installed on the surface of the plunger rod.

[0011] As a further embodiment of this utility model: the inner diameter of the guide sleeve matches the outer diameter of the plunger rod, and the guide sleeve is threadedly connected and installed at the end of the cylinder.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This application achieves a compact structure by integrating the steel ball and throttle valve inside the plunger body. This not only simplifies the assembly process and improves assembly efficiency but also ensures a faster response speed, enabling rapid adaptation to changes in operating conditions. Furthermore, this design provides reliable cushioning, effectively reducing impacts and vibrations caused by high-speed movement, significantly improving the operating environment and enhancing the stability and safety of the equipment. Secondly, the throttle orifice is integrated into the throttle valve using a modular design. Compared to directly machining the throttle orifice onto the piston rod or piston, this design offers higher dimensional consistency and stability, ensuring uniformity and reliability of the throttling effect and avoiding performance fluctuations caused by machining errors. Simultaneously, this design simplifies the manufacturing process, reduces manufacturing costs, and improves production efficiency, making it more suitable for large-scale production and application. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the plunger cylinder assembly structure of this utility model;

[0015] Figure 2 This is a cross-sectional schematic diagram of the cylinder bottom, cylinder barrel and plunger assembly of this utility model;

[0016] Figure 3 This is a cross-sectional schematic diagram of the plunger assembly of this utility model;

[0017] Figure 4This is a schematic diagram of the cylinder bottom of this utility model;

[0018] Figure 5 This is a schematic diagram of the plunger assembly of this utility model;

[0019] Figure 6 This is a schematic diagram of the inside of the valve hole of this utility model;

[0020] Figure 7 This is a schematic diagram of the throttle valve and steel ball assembly of this utility model;

[0021] In the diagram: 1. Cylinder barrel; 2. Cylinder bottom; 3. Oil inlet; 4. Fixed seat; 5. Guide sleeve; 6. Plunger assembly; 6-1. Plunger body; 6-2. Sealing ring; 6-3. Oil replenishment hole; 6-4. Valve hole; 6-5. Throttle valve; 6-6. Steel ball; 7. Plunger rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-7In this embodiment of the present invention, a one-way buffer structure for a plunger cylinder includes a cylinder barrel 1. A cylinder bottom 2 and a guide sleeve 5 are respectively installed at both ends of the cylinder barrel 1. An oil inlet hole 3 is provided on the cylinder bottom 2, which is connected to the interior of the cylinder barrel 1. The end of the cylinder bottom 2 is welded to the end of the cylinder barrel 1. The inner diameter of the guide sleeve 5 matches the outer diameter of the plunger rod 7, and the guide sleeve 5 is threadedly installed at the end of the cylinder barrel 1, effectively preventing oil leakage from the two open sides of the cylinder barrel 1 and achieving a better sealing effect. A plunger assembly 6 is fitted inside the cylinder barrel 1. When driven by external force, the plunger assembly 6 moves relative to the cylinder barrel 1. When oil enters the interior of the cylinder barrel 1, it can push the plunger assembly 6 to move to the other side. The plunger assembly 6 is connected to the plunger rod 7, and the plunger assembly 6 can drive the plunger rod 7 while moving. The piston assembly 6 moves synchronously and includes a piston body 6-1 and a valve hole 6-4 inside the piston body 6-1. The piston body 6-1 has a through cavity along its axial direction. The two opening sides of the through cavity are connected to the oil inlet hole 3 and the oil chamber of the piston rod 7, respectively. The surface of the piston body 6-1 is also provided with an oil replenishment hole 6-3, which connects the cylinder 1 and the valve hole 6-4. There are two oil replenishment holes 6-3. The diameter of a single hole of the oil replenishment hole 6-3 is smaller than that of the steel ball 6-6. This increases the oil flow and solves the problem that the steel ball 6-6 blocks the oil replenishment hole 6-3 and cannot replenish oil. A throttle valve 6-5 is provided on the opening side of the valve hole 6-4 near the bottom of the cylinder 2. A throttle orifice is provided on the throttle valve 6-5, which connects both sides of the throttle valve 6-5. A steel ball 6-6 is provided inside the valve hole 6-4.

[0024] Please see Figure 1 In one embodiment, preferably, a fixing seat 4 is installed on the outer peripheral surface of the cylinder 1. Furthermore, the fixing seat 4 facilitates the stable installation of the cylinder 1 on the forklift.

[0025] Please see Figure 3 In one embodiment, preferably, the plunger body 6-1 has an annular groove along its outer circumferential surface, and a sealing ring 6-2 is provided inside the annular groove. Furthermore, the sealing ring 6-2 is made of rubber. By fitting the sealing ring 6-2 into the annular groove, the sealing ring 6-2 can be fixed. In addition, the presence of the sealing ring 6-2 can effectively prevent oil from flowing to the other side of the sealing ring 6-2.

[0026] Please see Figure 3 In one embodiment, preferably, the plunger rod 7 has an oil cavity at the end near the plunger body 6-1, and the surface of the plunger rod 7 has an oil hole that communicates with the oil cavity. When the plunger rod 7 extends outward, the oil enters the interior of the oil cavity and then enters the interior of the cylinder 1 through the oil hole.

[0027] Please see Figure 5-6In one embodiment, preferably, the plunger body 6-1 and the plunger rod 7 are connected by threads. A set screw is installed on the surface of the plunger rod 7. Furthermore, after the plunger rod 7 is threadedly connected to the plunger body 6-1, the two are fixed together. However, when the plunger rod rotates along its axial direction, it may fall off the plunger body 6-1. Therefore, under the action of the set screw, the axial direction of the plunger rod 7 is locked, ensuring the stability between the plunger body 6-1 and the plunger rod 7.

[0028] The working principle and usage process of this utility model are as follows: When the hydraulic cylinder needs to extend, the oil first enters the interior of the through cavity and the oil chamber through the oil inlet 3 in sequence; then, the oil enters the interior of the cylinder 1 through the oil hole on the plunger rod 7; at the end of the extension stroke, the oil port on the plunger rod 7 enters the interior of the guide sleeve 5. Since the sealing ring 6-2 is installed on the plunger body 6-1, the oil in the cylinder 1 is forced to enter the interior of the valve hole 6-4 through the oil replenishment hole 6-3; at this time, the return oil resistance increases, forming a buffer back pressure; this back pressure pushes the steel ball 6-6 to contact and seal with the throttle valve 6-5, so that the oil in the buffer zone can only return through the throttle hole, thereby achieving the effect of deceleration and buffering, effectively reducing the impact and vibration when the piston reaches the end of the stroke; when the cylinder needs to descend, the return oil back pressure will push the steel ball 6-6 away, and the oil can be quickly replenished through the large hole in the middle of the throttle valve 6-5, thereby achieving a smooth descent and avoiding the flow fluctuation and shaking phenomenon caused by sudden acceleration.

[0029] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0030] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A one-way buffer structure for a plunger cylinder, comprising a cylinder barrel (1), wherein a cylinder bottom (2) and a guide sleeve (5) are respectively installed at both ends of the cylinder barrel (1), characterized in that, A plunger assembly (6) is fitted inside the cylinder (1). When driven by an external force, the plunger assembly (6) moves relative to the cylinder (1). The plunger assembly (6) is connected to the plunger rod (7). The plunger assembly (6) includes a plunger body (6-1) and a valve hole (6-4) opened inside the plunger body (6-1). The surface of the plunger body (6-1) is also provided with an oil filling hole (6-3), which connects the cylinder (1) and the valve hole (6-4). A throttle valve (6-5) is provided on the opening side of the valve hole (6-4) near the bottom of the cylinder (2). A throttle hole is opened on the throttle valve (6-5), which passes through both sides of the throttle valve (6-5). A steel ball (6-6) is provided inside the valve hole (6-4).

2. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, An oil inlet hole (3) is provided on the bottom of the cylinder (2), and the oil inlet hole (3) is connected to the inside of the cylinder barrel (1).

3. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, A mounting base (4) is installed on the outer circumferential surface of the cylinder (1).

4. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, The plunger body (6-1) has an annular groove along its outer circumference, and a sealing ring (6-2) is provided inside the annular groove.

5. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, The plunger rod (7) has an oil cavity at the end near the plunger body (6-1), and the surface of the plunger rod (7) has an oil hole that communicates with the oil cavity.

6. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, The plunger body (6-1) and the plunger rod (7) are connected by threads, and a set screw is installed on the surface of the plunger rod (7).

7. The unidirectional buffer structure for a plunger cylinder according to claim 1, characterized in that, The inner diameter of the guide sleeve (5) matches the outer diameter of the plunger rod (7), and the guide sleeve (5) is threadedly installed at the end of the cylinder (1).

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