Piston and piston rod combined structure, oil cylinder and operation machine

Abstract

The utility model provides a combined structure of a piston and a piston rod, an oil cylinder and an operation machine. The combined structure of the piston and the piston rod comprises the piston rod. The piston is connected to the periphery of one end of the piston rod; the annular plate is arranged at the end of the piston rod, and the axis of the annular plate coincides with the axis of the piston rod; the conical groove is formed in the piston, and the small end of the conical groove is close to the annular plate; the number of the clamping grooves is at least two, the clamping grooves are distributed in the conical groove, and the corresponding positions of the annular plates are clamped into the clamping grooves. According to the piston and piston rod combined structure, the piston is connected to the periphery of one end of the piston, the annular plate is arranged at the end of the piston rod, the axis of the annular plate coincides with the axis of the piston rod, the conical groove is formed in the piston, the small end of the conical groove is close to the annular plate, and the clamping grooves are distributed in the conical groove. And the corresponding position of the annular plate is clamped into the clamping groove through knocking, so that looseness prevention can be achieved, the length of the piston is reduced, and the structure is compact.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder processing, in particular to a piston-rod combination structure, an oil cylinder and a working machine. Background Technique

[0002] The piston rod is one of the important parts in the oil cylinder. The stability of the piston rod, the fitting with the piston, and the connection stability with the oil cylinder all directly affect the service life of the oil cylinder. For traditional piston rods, most of them use set screws to prevent loosening, or use nuts and set screws to prevent loosening between the piston rod and the piston.

[0003] However, most of the above connection methods have the disadvantage of large occupied space and are not suitable for oil cylinders with a compact structure. Summary of the Utility Model

[0004] The utility model provides a piston-rod combination structure, an oil cylinder and a working machine, which are used to solve the defect that the connection method of the piston rod and the piston in the prior art occupies a large space and is not suitable for oil cylinders with a compact structure, and realizes fixation and anti-loosening, and has a compact structure.

[0005] The utility model provides a piston-rod combination structure, including:

[0006] A piston rod;

[0007] A piston, connected to the outer periphery of one end of the piston rod;

[0008] An annular plate, arranged at the end of the piston rod, and the axis of the annular plate coincides with the axis of the piston rod;

[0009] A tapered groove, opened on the piston, and the small head end of the tapered groove is close to the annular plate;

[0010] At least two clamping grooves, distributed on the tapered groove, and the corresponding positions of the annular plate are clamped into the clamping grooves.

[0011] According to a piston-rod combination structure provided by the utility model, the clamping grooves are multiple, and the multiple clamping grooves are symmetrically arranged along the axis of the piston rod.

[0012] According to a piston-rod combination structure provided by the utility model, the thickness of the annular plate is 1-2 mm.

[0013] According to a piston-rod combination structure provided by the utility model, an external thread is arranged on the outer periphery of the piston rod, an internal thread is arranged on the piston, and the piston rod and the piston are in threaded connection.

[0014] According to a piston and piston rod combination structure provided by the present utility model, one end of the piston rod facing the conical groove is provided with a frustum-shaped structure, the annular plate is connected to the large head end of the frustum-shaped structure, and the end of the small head end of the frustum-shaped structure is flush with the outer end of the annular plate.

[0015] According to a piston and piston rod combination structure provided by the present utility model, the annular plate is integrally connected to the frustum-shaped structure.

[0016] According to a piston and piston rod combination structure provided by the present utility model, at least two wrench holes are provided at the end of the piston facing away from the piston rod.

[0017] According to a piston and piston rod combination structure provided by the present utility model, the piston includes a metal piston.

[0018] In the second aspect of the present utility model, an oil cylinder is provided, which includes the piston and piston rod combination structure described in any one of the above.

[0019] In the third aspect of the present utility model, a working machine is provided, which includes the piston and piston rod combination structure described in any one of the above, or the oil cylinder described above.

[0020] The piston and piston rod combination structure provided by the present utility model is connected to the outer periphery of one end of the piston. The annular plate is arranged at the end of the piston rod, and the axis of the annular plate coincides with the axis of the piston rod. The conical groove is opened on the piston, and the small head end of the conical groove is close to the annular plate. There are at least two clamping grooves, which are distributed on the conical groove, and the corresponding position of the annular plate is clamped into the clamping groove by knocking, which can not only achieve anti-loosening, but also reduce the length of the piston, and at the same time the piston can be disassembled.

[0021] The present utility model also provides an oil cylinder and a working machine. Since it includes the piston and piston rod combination structure described above, it has various advantages described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of the piston and piston rod combination structure provided by the present utility model.

[0024] Figure 2 is a cross-sectional view of the piston and piston rod combination structure provided by the present utility model.

[0025] Figure 3 This is a schematic end face structure diagram of the piston and piston rod combination structure provided by the present utility model.

[0026] Reference numerals:

[0027] 1. Piston rod; 2. Piston; 3. Annular plate; 4. Conical groove; 5. Card slot; 6. Frustum-shaped structure; 7. Wrench hole. Specific embodiments

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0030] The following combines Figures 1 - 3 to describe the piston and piston rod combination structure of the present utility model.

[0031] As Figure 1 , Figure 2 and Figure 3 shown, a piston and piston rod combination structure of the present utility model includes a piston rod 1, a piston 2, and an annular plate 3.

[0032] The piston rod 1, as the main transmission component, has its outer periphery at one end for mounting the piston 2.

[0033] The piston 2 is connected to the outer periphery of one end of the piston rod 1 and is used for reciprocating motion within the cylinder block.

[0034] The annular plate 3 is arranged at the end of the piston rod 1, and the axis of the annular plate 3 coincides with the axis of the piston rod 1 to ensure the coaxiality of the connection. The annular plate 3, as a connecting member, plays a key locking role. The annular plate 3 adopts a thin-edge structure and can be deformed under the knocking of a sharp tool.

[0035] The conical groove 4 is formed on the piston 2, and the small-end of the conical groove 4 is close to the annular plate 3; the design of the conical groove 4 enables the annular plate 3 to pass through smoothly during the assembly process, forming sufficient operating space for subsequent deformation and loosening prevention.

[0036] There are at least two clamping grooves 5, which are distributed on the conical groove 4, and the corresponding positions of the annular plate 3 are clamped into the clamping grooves 5, so as to realize the firm connection between the piston 2 and the piston rod 1.

[0037] For the combined structure of the piston and the piston rod provided by the present utility model, the annular plate 3 is initially in a regular state, and the end can be deformed by knocking and pressed into the conical groove 4, which can realize the fastening connection between the piston 2 and the piston rod 1, and further realize locking and loosening prevention. Moreover, the length of the piston can be reduced, which is suitable for a compact structure, and at the same time the piston can be disassembled.

[0038] During the assembly process, first, the piston 2 and the piston rod 1 are tightened by threads. The annular plate 3 is deformed by knocking and embedded into the conical groove 4. At this time, a firm and reliable connection is formed between the piston 2 and the piston rod 1, which can withstand large pressures and impacts.

[0039] In a feasible embodiment of the present utility model, there are multiple clamping grooves 5, and the multiple clamping grooves 5 are symmetrically arranged along the axis of the piston rod 1. When the annular plate 3 is pushed into the conical groove 4 and clamped into the clamping groove 5, the piston 2 will be subjected to a radial resistance, restricting the axial rotation freedom of the piston. The symmetrical design of the clamping grooves enables the piston to maintain better stability when rotating or receiving lateral forces. Even when encountering unstable forces or vibrations during operation, due to the symmetrical layout of the clamping grooves, the piston is not likely to shift or loosen.

[0040] In a feasible embodiment of the present utility model, the thickness of the annular plate 3 is 1-2 mm. As a key component connecting the piston and the piston rod, the thickness of the annular plate directly affects the strength and stability of the connection. The thickness of 1-2 mm ensures sufficient strength while avoiding material waste and difficult knocking deformation caused by excessive thickness.

[0041] In a feasible embodiment of the present utility model, an external thread is provided on the outer periphery of the piston rod 1, and an internal thread is provided on the piston 2. The piston rod 1 and the piston 2 are threadedly connected. The threaded connection forms a tight combination between the piston rod 1 and the piston 2 through the screwing action of the threads, with high connection strength and stability. This connection method can withstand large pushing and pulling forces, ensuring that the piston will not fall off or loosen during reciprocating motion. Due to the tight screwing of the threads and the good sealing performance provided by the static seal. In occasions where it is necessary to prevent medium leakage, this connection method is particularly important. By selecting appropriate sealing materials and thread designs, the sealing effect can be further improved.

[0042] In a feasible embodiment of the present utility model, one end of the piston rod 1 facing the conical groove 4 is provided with a frustum-shaped structure 6. The frustum-shaped structure 6 serves as a transition part between the piston rod 1 and the annular plate 3, and its shape enables a more stable connection. This design helps to reduce stress concentration and improve the strength and durability of the connection. The annular plate 3 is connected to the large end of the frustum-shaped structure 6, and the end of the small head of the frustum-shaped structure is flush with the outer end of the annular plate 3, making the combined structure of the piston and piston rod more compact. Additionally, since the end of the small head of the frustum-shaped structure is flush with the outer end of the annular plate 3, this provides an accurate positioning reference for the installation of the annular plate 3. During the installation process, it is easier to ensure the alignment and fastening of the annular plate 3 and the piston rod 1, thereby improving the accuracy and stability of the connection.

[0043] In a feasible embodiment of the present utility model, the annular plate 3 and the frustum-shaped structure 6 are integrally connected. This enhances the integrity and rigidity of the entire connection structure. This design reduces the performance degradation caused by loosening or wear between the connecting parts and improves the stability and durability of the entire structure. The integrally connected design simplifies the processing process, reduces the processing steps and assembly difficulty. During the manufacturing process, the two can be firmly connected together through one-time machining or by using processes such as welding and casting, thereby improving the production efficiency and processing accuracy.

[0044] In a feasible embodiment of the present utility model, at least two wrench holes 7 are provided at the end of the piston 2 facing away from the piston rod 1. The wrench holes 7 are used to provide a force application point for tightening the piston. The shape and size of the wrench holes 7 should be carefully designed to ensure that it can provide sufficient strength to ensure the tightening of the thread without being too large to prevent loss of the piston's strength and excessive machining.

[0045] In a feasible embodiment of the present utility model, the piston 2 includes a metal piston. The metal material has high strength and can stably support the oil cylinder guide ring and seal, effectively preventing medium leakage. This is particularly important for systems that require high pressure, high temperature, or corrosive media.

[0046] An embodiment of the second aspect of the present utility model lies in providing an oil cylinder, including the piston and piston rod combined structure as described in any one of the above embodiments.

[0047] The oil cylinder provided by the present utility model, due to including the piston and piston rod combined structure as described above, realizes deformation and anti-loosening by knocking the annular plate 3 into the clamping groove 5 of the piston 2, reduces the size of the piston 2, and makes the oil cylinder structure more compact; moreover, the piston 2 can be disassembled, facilitating maintenance and replacement, with high reliability, and multi-point knocking deformation, resulting in a good anti-loosening effect.

[0048] An embodiment of the third aspect of the present utility model lies in providing a working machine, including the piston and piston rod combined structure as described in any one of the above embodiments, or the oil cylinder as described in any one of the above embodiments.

[0049] Since the working machine provided by the present utility model includes the piston and piston rod combination structure or the oil cylinder as described above, it has various advantages as described above, which will not be elaborated here.

[0050] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0051] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or modes. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A piston-rod combination structure, characterized in that: include: Piston rod (1); A piston (2) connected to the outer periphery of one end of the piston rod (1); An annular plate (3) is arranged at the end of the piston rod (1), and the axis of the annular plate (3) coincides with the axis of the piston rod (1); A conical groove (4) is formed on the piston (2), and a small end of the conical groove (4) is close to the annular plate (3); There are at least two clamping grooves (5) distributed on the conical groove (4), and corresponding positions of the annular plate (3) are clamped into the clamping grooves (5).

2. The piston-rod combination structure according to claim 1, characterized in that: There are a plurality of the clamping grooves (5), and the plurality of the clamping grooves (5) are symmetrically arranged along the axis of the piston rod (1).

3. The piston-rod combination structure according to claim 1, characterized in that: The thickness of the annular plate (3) is 1-2 mm.

4. The piston-rod combination structure according to claim 1, characterized in that: The outer circumference of the piston rod (1) is provided with an external thread, the piston (2) is provided with an internal thread, and the piston rod (1) and the piston (2) are threadedly connected.

5. The piston-rod combination structure according to claim 1, characterized in that: One end of the piston rod (1) facing the conical groove (4) is provided as a truncated cone structure (6), the annular plate (3) is connected to the large end of the truncated cone structure (6), and the end of the small end of the truncated cone structure is flush with the outer end of the annular plate (3).

6. The piston-rod combination structure according to claim 5, characterized in that: The annular plate (3) is integrally connected to the truncated cone-shaped structure (6).

7. The piston-rod combination structure according to claim 1, characterized in that: At least two wrench holes (7) are provided at the end of the piston (2) facing away from the piston rod (1).

8. The piston-rod combination structure according to claim 1, characterized in that: The piston (2) comprises a metal piston.

9. An oil cylinder, characterized in that: A piston-rod combination structure comprising the piston-rod combination structure according to any one of claims 1 to 8.

10. A working machine, characterized in that: It comprises the piston-piston-rod combination structure according to any one of claims 1 to 8, or the oil cylinder according to claim 9.

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