Compact small-size floating plunger buffer structure

Abstract

The utility model relates to a compact type small-size floating plunger buffering structure which comprises a cylinder body, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod and a piston rod, the piston is sleeved with the cylinder body in a sliding mode in the length direction of the cylinder body, and the piston is provided with a through hole from one end to the other end; the piston rod is screwed into the internal thread arranged in the through hole of the piston from one end of the piston in a threaded mode; one end of the buffer column is limited in the through hole of the piston, and the other end of the buffer column extends out of the end face of the other end of the piston and points to the bottom of the cylinder body; the buffer column can slide in the length direction of the piston. And oil is filled between the bottom of the cylinder body and the piston. The buffer device is high in flexibility, buffer devices of different schemes can be prepared in advance according to requirements of clients, field disassembly and debugging are achieved, and the debugging period is short. Disassembly and installation are convenient, and after the buffering device is abraded, only abraded parts need to be replaced independently; the machining process is simple, assembling is convenient, and production efficiency is high.

Description

Technical Field

[0001] This utility model relates to the technical field of buffer equipment in engineering machinery, and in particular to a compact, small-sized floating plunger buffer structure. Background Technology

[0002] In today's rapidly developing technological society, construction machinery has become an important tool, and hydraulic cylinders are a crucial actuator within it. Among these, buffer devices are designed to cushion the impact of high-speed operation. During high-speed operation, construction machinery inevitably experiences significant impact forces at the end of its stroke; buffer devices are needed to mitigate this impact and prevent wear and damage.

[0003] The comfort of using construction machinery largely depends on the cushioning effect of the buffer device. Different manufacturers have different requirements for cushioning time and effect. Currently, there are rodless chamber buffers, piston-type buffers, and floating buffers. The above buffer structures have the following disadvantages: 1. The buffer device is not detachable, requiring replacement of the piston rod assembly, resulting in high maintenance costs and difficult maintenance; 2. Poor flexibility, as it cannot be replaced and adjusted on-site and must be returned to the factory for adjustment; 3. The buffer structure requires a large space, which cannot meet the cushioning needs of small-sized hydraulic cylinders. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a compact, small-sized floating plunger buffer structure to address the above-mentioned shortcomings.

[0005] This utility model is achieved through the following technical solution:

[0006] A compact, small-sized floating plunger buffer structure, the buffer structure comprising:

[0007] The cylinder has a cavity inside and is open at one end;

[0008] A piston, which is slidably fitted into the cylinder along the length of the cylinder body, and has a through hole from one end to the other.

[0009] A piston rod, threaded from one end of the piston into an internal thread provided in the through hole of the piston; and

[0010] A buffer post, one end of which is confined within the through hole of the piston, and the other end of which extends from the other end face of the piston and points towards the bottom of the cylinder; the buffer post can slide along the length of the piston;

[0011] The bottom of the cylinder is filled with oil between it and the piston.

[0012] Furthermore, in the aforementioned compact small-sized floating plunger buffer structure, the cavity of the cylinder body includes an opening, a rodless cavity, a transition cavity, and a bottom cavity that are sequentially connected.

[0013] Furthermore, in the aforementioned compact small-sized floating plunger buffer structure, the diameter of the bottom cavity is smaller than that of the transition cavity, and the diameter of the transition cavity is smaller than that of the rodless cavity; the piston can slide along the length of the cylinder so that its other end enters the transition cavity and abuts against the bottom of the rodless cavity.

[0014] Furthermore, in the aforementioned compact small-size floating plunger buffer structure, the cavity of the cylinder body further includes a three-way T-shaped cavity and an oil inlet cavity;

[0015] The two ends of the oil inlet chamber are respectively connected to the oil tank and the bottom chamber;

[0016] The three-way T-shaped cavity includes a first cavity, a second cavity, and a third cavity that are interconnected. The first cavity is connected to the bottom cavity, the second cavity is connected to the transition cavity, and the third cavity is connected to the outside of the cylinder body. The third cavity is blocked from the outside of the cylinder body, and the steel ball is blocked at the end of the first cavity by the action of a spring disposed in the third cavity.

[0017] Furthermore, in the aforementioned compact, small-sized floating plunger buffer structure, the diameters of the first and second cavities are smaller than the diameter of the third cavity.

[0018] Furthermore, in the aforementioned compact, small-sized floating plunger buffer structure, a sealing ring is provided between the cylinder and the piston.

[0019] Furthermore, in the aforementioned compact small-sized floating plunger buffer structure, the through hole of the piston includes a large opening, an outer cavity, a piston rod cavity with internal threads, a buffer column cavity, and a small opening connected in sequence; the diameter of the large opening is the same as that of the outer cavity, the diameter of the piston rod cavity is smaller than that of the outer cavity, the diameter of the buffer column cavity is the same as that of the piston rod cavity, and the diameter of the small opening is smaller than that of the buffer column cavity.

[0020] Furthermore, in the compact small-sized floating plunger buffer structure, the buffer plunger includes a limiting portion confined within the buffer plunger cavity and a buffer portion extending outward along the limiting portion with a diameter smaller than the limiting portion; the buffer portion extends from the small opening and points towards the bottom of the cylinder.

[0021] Furthermore, in the aforementioned compact small-sized floating plunger buffer structure, there is a gap between one end face of the buffer plunger and the piston rod.

[0022] Furthermore, in the aforementioned compact small-sized floating plunger buffer structure, the cylinder body includes a cylindrical body having the rodless cavity and a bottom body partially sleeved within the cylindrical body, the bottom body having the transition cavity and the bottom cavity.

[0023] The advantages and effects of this utility model are:

[0024] 1. This utility model provides a compact, small-sized floating plunger buffer structure that achieves floating buffering under conditions of limited space and long working stroke. The floating plunger buffer structure includes a detachable cylinder, piston, piston rod, and buffer column, offering high flexibility. Different buffer devices can be prepared in advance according to customer requirements, allowing for on-site disassembly and adjustment with a short adjustment cycle. Furthermore, disassembly and installation are convenient, and after the buffer device wears out, only the worn parts need to be replaced individually.

[0025] 2. The compact, small-sized floating plunger buffer structure provided by this utility model features simple processing of each component, convenient assembly, and high production efficiency. Its compact structure makes it suitable for products with limited space and long working strokes. The buffer device is small in size and has high machining precision, making it suitable for small-sized hydraulic cylinders. Different materials can be used according to customer requirements to extend its service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the initial state of the floating plunger buffer structure provided by this utility model;

[0027] Figure 2 This invention provides a schematic diagram of the cylinder body of a floating plunger buffer structure.

[0028] Figure 3 This invention provides a schematic diagram of the piston structure of the floating plunger buffer structure.

[0029] Figure 4 This invention provides a schematic diagram of the combined structure of the piston, piston rod, and buffer column of the floating plunger buffer structure.

[0030] Figure 5 This diagram illustrates the buffer state of the floating plunger buffer structure provided by this invention.

[0031] Explanation of reference numerals in the attached drawings: 1-Cylinder body, 11-Cylindrical body, 12-Bottom body, 13-Opening, 14-Rodless chamber, 15-Transition chamber, 16-Bottom chamber, 17-Oil inlet chamber, 18-T-shaped chamber, 181-First chamber, 182-Second chamber, 183-Third chamber, 19-Steel ball, 2-Piston, 21-Large opening, 22-Outer chamber, 23-Piston rod chamber, 24-Buffer column chamber, 25-Small opening, 3-Piston rod, 4-Buffer column, 41-Limiting part, 42-Buffer part, 5-Sealing ring. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. The described embodiments are only some, not all, of the embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings:

[0033] In the description of this utility model, it should be understood that, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, as fixed connections, detachable connections, or integral connections; they can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] Figure 1This diagram illustrates the initial state of the floating plunger buffer structure provided by this invention. The floating plunger buffer structure includes a cylinder 1, a piston 2, a piston rod 3, and a buffer column 4. The cylinder 1 has a cavity, open at one end and closed at the other, forming the bottom. The piston 2 is disposed in this cavity and slidably fitted within the cylinder 1 along its length. The piston 2 has a through hole from one end to the other. Specifically, a sealing ring 5 is provided between the cylinder 1 and the piston 2. The piston rod 3 is threaded into the through hole of the piston 2 from one end. Specifically, the piston rod 3 has an external thread, and the through hole of the piston 2 has segmented internal threads. The external thread of the piston rod 3 mates with the internal thread of the piston 2, fixing the piston rod 3 within the piston 2. One end of the buffer column 4 is confined within the through hole of the piston 2, and the other end extends from the other end face of the piston 2, pointing towards the bottom of the cylinder 1. The buffer column 4 can slide along the length of the piston 2. Oil is filled between the bottom of the cylinder 1 and the piston 2.

[0035] One end of piston 2, piston rod 3 and buffer column 4 refers to the end of cylinder 1 in the opening direction (left side of the figure), and the other end of piston 2, piston rod 3 and buffer column 4 refers to the end of cylinder 1 in the bottom direction (right side of the figure).

[0036] When one end of the piston rod 3 retracts under pressure, the piston rod 3 drives the piston 2 and the buffer column 4 to gradually move towards the bottom of the cylinder 1. Figure 5 As shown, the other end of the buffer column 4 enters the bottom of the cylinder 1, reducing the oil flow area and increasing the oil pressure between the bottom of the cylinder 1 and the piston 2. This slows down the movement speed of the piston rod 3, reducing or preventing the impact between the piston 2 and the bottom of the cylinder 1 when it reaches the end of its stroke. The buffer column 4 is made of a material with high hardness, which can prevent surface scratches. The cylinder 1, piston 2, piston rod 3, and buffer column 4 are detachable. The piston rod 3 can be unscrewed out of the through hole of the piston 2 for easy replacement of the easily damaged buffer column 4.

[0037] Furthermore, such as Figure 2 As shown, the cavity of cylinder 1 includes an opening 13, a rodless cavity 14, a transition cavity 15, and a bottom cavity 16 connected in sequence. The diameter of the bottom cavity 16 is smaller than that of the transition cavity 15, and the diameter of the transition cavity 15 is smaller than that of the rodless cavity 14. Specifically, there is also a gap cavity between the bottom cavity 16 and the transition cavity 15, with a diameter smaller than that of the bottom cavity 16. The diameter of the gap cavity matches the diameter of the other end of the piston rod 3. When the other end of the piston rod 3 enters the bottom cavity 16 through the gap cavity, there is a gap between the other end of the piston rod 3 and the side wall of the gap cavity, which allows oil to pass into the transition cavity 15 and the rodless cavity 14. The piston 2 can slide along the length of cylinder 1 until its other end enters the transition cavity 15 and abuts against the bottom of the rodless cavity 14. That is, the shape of the other end face of the piston 2 matches the shape of the side wall of the transition cavity 15 transitioning to the rodless cavity 14.

[0038] like Figure 3As shown, the through hole of piston 2 includes a large opening 21, an outer cavity 22, a piston rod cavity 23 with internal threads, a buffer column cavity 24, and a small opening 25 connected in sequence. The diameter of the large opening 21 is the same as that of the outer cavity 22, the diameter of the piston rod cavity 23 is smaller than that of the outer cavity 22, the diameter of the buffer column cavity 24 is the same as that of the piston rod cavity 23, and the diameter of the small opening 25 is smaller than that of the buffer column cavity 24. The external thread of piston rod 3 engages with the internal thread of piston rod cavity 23, fixing piston rod 3 in the position of piston rod cavity 23 inside piston 2.

[0039] like Figure 4 As shown, the buffer column 4 includes a limiting portion 41 confined within the buffer column cavity 24 and a buffer portion 42 extending outward along the limiting portion 41 with a diameter smaller than that of the limiting portion 41. The diameter of the buffer portion 42 matches that of the small opening 25, and the buffer portion 42 extends outward from the small opening 25 and points towards the bottom of the cylinder body 1. There is a gap between one end face of the buffer column 4 and the piston rod 3.

[0040] When one end of the piston rod 3 retracts under pressure, the piston rod 3 drives the piston 2 and the buffer column 4 to gradually move towards the bottom of the cylinder 1. Figure 5 As shown, the buffer part 42 of the buffer column 4 enters the bottom cavity 16. Oil can only enter the transition cavity 15 and the rodless cavity 14 through the annular gap formed by the gap cavity and the buffer part 42 of the buffer column 4, which reduces the oil passage area, increases the oil pressure between the bottom of the cylinder 1 and the piston 2, and slows down the movement speed of the piston rod 3, thereby reducing or avoiding the impact between the piston 2 and the bottom of the cylinder 1 when the piston reaches the end of its stroke.

[0041] like Figure 1 , 2 As shown, the cavity of cylinder 1 also includes a T-shaped cavity 18 and an oil inlet cavity 17. The two ends of the oil inlet cavity 17 are connected to the oil tank and the bottom cavity 16, respectively, and oil from the oil tank can enter the bottom cavity 16 through a valve. The T-shaped cavity 18 includes a first cavity 181, a second cavity 182, and a third cavity 183 that are interconnected. Specifically, the connection point of the first cavity 181, the second cavity 182, and the third cavity 183 is the junction of their ends. The first cavity 181 connects to the bottom cavity 16, the second cavity 182 connects to the transition cavity 15, and the third cavity 183 connects to the outside of cylinder 1. The third cavity 183 is sealed from the outside of cylinder 1, and the steel ball 19, under the action of a spring located in the third cavity 183, seals the end of the first cavity 181. The diameters of the first cavity 181 and the second cavity 182 are smaller than the diameter of the third cavity 183. The diameter of the steel ball 19 matches that of the third cavity 183, allowing it to enter the third cavity 183 but not the first cavity 181 or the second cavity 182.

[0042] When piston rod 3 needs to extend, oil enters from the oil tank to the bottom chamber 16, where the pressure increases. The oil overcomes the spring force of spring 19 through the first chamber 181, pushing steel ball 5 open. Steel ball 5 enters the third chamber 183, and oil enters the transition chamber 15 through the first chamber 181 and the second chamber 182, acting on the other end face of piston 2 to generate a force that drives piston rod 3 to extend.

[0043] Furthermore, such as Figure 1 , 2 As shown, the cylinder body 1 includes a cylindrical body 11 with a rodless cavity 14 and a bottom body 12 partially fitted inside the cylindrical body 11, facilitating disassembly and maintenance of internal components when necessary. The bottom body 12 has a transition cavity 15 and a bottom cavity 16. A sealing ring is provided between the cylindrical body 11 and the bottom body 12.

[0044] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of implementation of this utility model. Any equivalent changes and modifications made within the protection scope of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A compact, small-sized floating plunger buffer structure, characterized in that, The floating plunger buffer structure includes: The cylinder (1) has a cavity inside and is open at one end; The piston (2) is slidably fitted inside the cylinder (1) along the length of the cylinder (1) and has a through hole from one end to the other. The piston rod (3) is threaded from one end of the piston (2) into the through hole of the piston (2) by an internal thread; and The buffer column (4) has one end confined within the through hole of the piston (2) and the other end protruding from the other end face of the piston (2) and pointing towards the bottom of the cylinder (1); the buffer column (4) can slide along the length direction of the piston (2); The bottom of the cylinder (1) is filled with oil between the piston (2).

2. The compact, small-sized floating plunger buffer structure according to claim 1, characterized in that, The cavity of the cylinder (1) includes the opening (13), rodless cavity (14), transition cavity (15) and bottom cavity (16) of the cylinder (1) connected in sequence.

3. The compact, small-sized floating plunger buffer structure according to claim 2, characterized in that, The diameter of the bottom cavity (16) is smaller than that of the transition cavity (15), and the diameter of the transition cavity (15) is smaller than that of the rodless cavity (14); the piston (2) can slide along the length of the cylinder (1) until its other end enters the transition cavity (15) and abuts against the bottom of the rodless cavity (14).

4. The compact, small-sized floating plunger buffer structure according to claim 2, characterized in that, The cavity of the cylinder (1) further includes a three-way T-shaped cavity (18) and an oil inlet cavity (17); The two ends of the oil inlet chamber (17) are respectively connected to the oil tank and the bottom chamber (16); The three-way T-shaped cavity (18) includes a first cavity (181), a second cavity (182), and a third cavity (183) that are interconnected. The first cavity (181) is connected to the bottom cavity (16), the second cavity (182) is connected to the transition cavity (15), and the third cavity (183) is connected to the outside of the cylinder (1). The third cavity (183) is blocked from the outside of the cylinder (1). The steel ball (19) is blocked at the end of the first cavity (181) by the action of the spring set in the third cavity (183).

5. A compact, small-sized floating plunger buffer structure according to claim 4, characterized in that, The diameters of the first lumen (181) and the second lumen (182) are smaller than the diameter of the third lumen (183).

6. A compact, small-sized floating plunger buffer structure according to any one of claims 1 to 5, characterized in that, A sealing ring (5) is provided between the cylinder (1) and the piston (2).

7. The compact, small-sized floating plunger buffer structure according to claim 1, characterized in that, The through hole of the piston (2) includes a large opening (21), an outer cavity (22), a piston rod cavity (23) with internal threads, a buffer column cavity (24), and a small opening (25) connected in sequence; the diameter of the large opening (21) is the same as that of the outer cavity (22), the diameter of the piston rod cavity (23) is smaller than that of the outer cavity (22), the diameter of the buffer column cavity (24) is the same as that of the piston rod cavity (23), and the diameter of the small opening (25) is smaller than that of the buffer column cavity (24).

8. A compact, small-sized floating plunger buffer structure according to claim 7, characterized in that, The buffer column (4) includes a limiting part (41) confined within the buffer column cavity (24) and a buffer part (42) extending outward along the limiting part (41) and having a diameter smaller than the limiting part (41); the buffer part (32) extends out from the small opening (25) and points towards the bottom of the cylinder (1).

9. A compact, small-sized floating plunger buffer structure according to any one of claims 1 to 5, characterized in that, There is a gap between one end face of the buffer column (4) and the piston rod (3).

10. A compact, small-sized floating plunger buffer structure according to any one of claims 2 to 5, characterized in that, The cylinder (1) includes a cylindrical body (11) having the rodless cavity (14) and a bottom body (12) partially fitted inside the cylindrical body (11), the bottom body (12) having the transition cavity (15) and the bottom cavity (16).

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