Piston rod for forklift oil cylinder

Abstract

The utility model relates to the technical field of piston rods, in particular to a piston rod for a forklift oil cylinder, which comprises a piston rod main body and a piston head, a containing groove is arranged on the piston head, a sealing cushion is fixedly arranged in the containing groove, and an upper fixing plate is fixedly sleeved on the piston rod main body. The piston rod body is movably sleeved with a lower fixing plate, and a fixing mechanism used for fixing and limiting the piston head is arranged between the upper fixing plate and the lower fixing plate. The threaded part is in threaded connection with the fixing piece, the piston head can be fixedly installed through the upper fixing plate and the lower fixing plate through the fixing piece, the upper fixing plate and the lower fixing plate extrude the upper end and the lower end of the piston head to achieve metal hard sealing, and the piston head is matched with the sealing soft cushion arranged in the containing groove. And the piston rod is connected with the piston head through the upper fixing plate and the lower fixing plate, so that the stress area of the piston rod and the piston head is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of piston rods, in particular to a piston rod for a forklift oil cylinder. Background Art

[0002] The loader's excavation and loading and unloading operations are achieved through the movement of its working device. The loader's working device consists of a bucket, boom, connecting rod, rocker arm, bucket cylinder, boom cylinder, etc., and the piston rod on the cylinder needs to bear a large force during operation.

[0003] The piston rod material of the prior art is relatively brittle. Under long-term high frequency and high load conditions, the piston rod is very likely to suffer fatigue fracture inside the cylinder, and the sealing ring is also very likely to wear when the piston rod is performing high frequency operation, affecting the sealing between the piston and the cylinder. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the piston rod and the sealing ring are very easy to wear under long-term high frequency and large load conditions, and proposes a piston rod for a forklift oil cylinder.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A piston rod for a forklift oil cylinder comprises a piston rod body and a piston head, wherein a receiving groove is provided on the piston head, a sealing cushion is fixedly arranged in the receiving groove, an upper fixing plate is fixedly sleeved on the piston rod body, and a lower fixing plate is movably sleeved on the piston rod body;

[0007] A fixing mechanism for fixing and limiting the position of the piston head is arranged between the upper fixing plate and the lower fixing plate.

[0008] Preferably, the piston rod body is a cylindrical structure, the piston head is a disc-shaped structure, and the corners of the piston head are all rounded.

[0009] Preferably, the receiving groove is an annular structure, and a movable through hole for movably fitting the piston rod body is provided on the lower fixing plate, and the lower fixing plate and the upper fixing plate are arranged correspondingly up and down.

[0010] Preferably, the fixing mechanism comprises a limiting rod fixedly connected to the lower fixing plate, the upper end of the limiting rod is integrally provided with a threaded portion, the threaded portion is matched with a fixing piece, and the fixing piece is fixedly connected to the driving rod.

[0011] Preferably, the lower fixed plate is provided with a first guide through hole for a movable set limiting rod, and the piston head is provided with a second guide through hole for a movable set limiting rod.

[0012] Preferably, the fixing member is provided with an internal thread corresponding to the external thread of the threaded portion, and the driving rod is a cylindrical structure.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model uses a threaded connection between a threaded portion and a fixing piece, and the fixing piece can realize fixed installation of a piston head through an upper fixing plate and a lower fixing plate. The upper fixing plate and the lower fixing plate realize metal hard sealing by squeezing the upper and lower ends of the piston head, and cooperate with a sealing cushion arranged in the storage groove, which helps to ensure the sealing of the piston rod during operation. The piston rod is connected to the piston head through the upper fixing plate and the lower fixing plate, which helps to increase the force-bearing area of ​​the piston rod and the piston head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a piston rod for a forklift oil cylinder proposed by the utility model;

[0016] Figure 2 For this utility model Figure 1 Middle A is a schematic diagram of a partially enlarged structure;

[0017] Figure 3 A top view of a piston rod for a forklift oil cylinder proposed by the utility model;

[0018] Figure 4 The utility model is a bottom view of a piston rod for a forklift oil cylinder.

[0019] In the figure: 1. Piston rod body; 2. Piston head; 3. Storage groove; 4. Sealing cushion; 5. Upper fixing plate; 6. Lower fixing plate; 7. Limit rod; 8. Threaded part; 9. Fixing piece; 10. Driving rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-Figure 4 A piston rod for a forklift oil cylinder includes a piston rod body 1 and a piston head 2. The piston rod body 1 is a cylindrical structure. The diameter of the piston rod body 1 is 1.5 times the diameter of the existing piston rod body. By thickening the piston rod body 1, the cross-sectional area of ​​the piston rod body 1 is increased, which helps to improve the force strength of the piston rod body 1. The piston head 2 is a disc-shaped structure. The corners of the piston head 2 are all rounded. The rounded corner design can avoid excessive stress concentration;

[0022] The outer circle roughness Ra value of the piston rod body 1 and the piston head 2 is set to 0.25μm, so that the piston rod body 1 and the piston head 2 can form an oil film. The surface of the piston rod body 1 and the piston head 2 needs to be chrome-plated with a thickness of 0.05mm, which helps to improve the wear resistance and rust resistance of the piston rod body 1 and the piston head 2;

[0023] The piston head 2 is provided with a receiving groove 3, which is an annular structure, in which a sealing cushion 4 is fixedly arranged, and the installation method of the sealing cushion 4 and the receiving groove 3 is the existing technology;

[0024] An upper fixing plate 5 is fixedly mounted on the piston rod body 1, and a lower fixing plate 6 is movably mounted on the piston rod body 1. The lower fixing plate 6 is provided with a movable through hole for movably mounting the piston rod body 1. The lower fixing plate 6 and the upper fixing plate 5 are arranged correspondingly up and down.

[0025] A fixing mechanism for fixing and limiting the piston head 2 is provided between the upper fixing plate 5 and the lower fixing plate 6. The fixing mechanism can ensure the stability of the piston head 2 and realize metal hard sealing of the piston head 2 by extrusion fixing.

[0026] It is further explained that the fixing mechanism includes a limit rod 7 fixedly connected to the lower fixing plate 6, a first guide through hole for movably fitting the limit rod 7 is opened on the lower fixing plate 6, and a second guide through hole for movably fitting the limit rod 7 is opened on the piston head 2, and a movable space can be provided for the limit rod 7 through the first guide through hole and the second guide through hole;

[0027] The upper end of the limiting rod 7 is integrally provided with a threaded portion 8, and the threaded portion 8 is matched with a fixing member 9, and the fixing member 9 is provided with an internal thread corresponding to the external thread of the threaded portion 8. By rotating the fixing member 9, the piston head 2 can be squeezed and fixed through the upper fixing plate 5 and the lower fixing plate 6;

[0028] The fixing member 9 is fixedly connected with a driving rod 10, which is a cylindrical structure. Through the arrangement of the driving rod 10, the fixing member 9 can be directly disassembled manually when the staff has no auxiliary tools, which helps to improve the convenience of the staff at work.

[0029] The functional principle of the utility model can be explained through the following operation modes:

[0030] The sealing cushion 4 is fixedly installed in the receiving groove 3 on the piston head 2, and the piston head 2 is mounted on the lower end of the piston rod body 1, so that the upper end surface of the piston head 2 and the upper fixing plate 5 are movably abutted against each other, and then the lower fixing plate 6 is mounted on the lower end of the piston rod body 1, and the limiting rod 7 enters the first guide through hole and the second guide through hole, so that the lower end surface of the piston head 2 and the lower fixing plate 6 are movably abutted against each other;

[0031] The fixing member 9 is mounted on the threaded portion 8 on the limiting rod 7 , and the driving rod 10 is rotated to make the fixing member 9 rotate on the threaded portion 8 , so that the fixing member 9 and the upper fixing plate 5 are movably opposed to each other, thereby completing the fixing operation of the piston head 2 .

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A piston rod for a forklift oil cylinder, comprising a piston rod body (1) and a piston head (2), characterized in that: The piston head (2) is provided with a receiving groove (3), a sealing cushion (4) is fixedly arranged in the receiving groove (3), an upper fixing plate (5) is fixedly sleeved on the piston rod body (1), and a lower fixing plate (6) is movably sleeved on the piston rod body (1); A fixing mechanism for fixing and limiting the position of the piston head (2) is provided between the upper fixing plate (5) and the lower fixing plate (6).

2. The piston rod for a forklift cylinder according to claim 1, characterized in that: The piston rod body (1) is a cylindrical structure, the piston head (2) is a disc-shaped structure, and the corners of the piston head (2) are all rounded.

3. The piston rod for a forklift cylinder according to claim 1, characterized in that: The receiving groove (3) is an annular structure, and a movable through hole for movably fitting the piston rod body (1) is provided on the lower fixing plate (6). The lower fixing plate (6) and the upper fixing plate (5) are arranged correspondingly up and down.

4. The piston rod for a forklift cylinder according to claim 1, characterized in that: The fixing mechanism comprises a limiting rod (7) fixedly connected to the lower fixing plate (6); a threaded portion (8) is integrally provided at the upper end of the limiting rod (7); a fixing piece (9) is matched with the threaded portion (8); and a driving rod (10) is fixedly connected to the fixing piece (9).

5. The piston rod for a forklift cylinder according to claim 4, characterized in that: The lower fixed plate (6) is provided with a first guide through hole for a movable set limiting rod (7), and the piston head (2) is provided with a second guide through hole for a movable set limiting rod (7).

6. The piston rod for a forklift cylinder according to claim 4, characterized in that: The fixing member (9) is provided with an internal thread corresponding to the external thread of the threaded portion (8). The driving rod (10) is a cylindrical structure.

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