Buffering nitrogen cylinder of hydraulic machine

Abstract

The utility model discloses a buffer nitrogen cylinder of a hydraulic machine, which comprises at least two air cylinders, the air cylinders are used for buffering the gliding process of a sliding block, the air cylinders are filled with nitrogen, each air cylinder comprises a cylinder body, a piston and a piston rod, the piston is arranged in the cylinder body, the piston is fixedly connected with the piston rod, and the piston rod is arranged in the cylinder body. An air inlet is formed in the bottom side wall of the cylinder body. The hydraulic machine buffer system can completely replace an existing hydraulic machine buffer system, does not need an external pipeline, does not need to consume electric energy, saves energy, reduces emission and is more environment-friendly. Due to the fact that the nitrogen cylinder is filled with nitrogen, internal oxidation of devices and aging of sealing rings can be prevented according to inertia of the nitrogen, and the service life of parts is prolonged. Due to the characteristic of the nitrogen cylinder (the compressed nitrogen pressure intensity is larger), the internal pressure can be higher, compared with a common air balance cylinder, the part is smaller in appearance (the inner diameter can be smaller), and the part manufacturing cost can be reduced.

Description

Technical Field

[0001] The utility model is a buffer nitrogen cylinder for a hydraulic press. Background Art

[0002] A hydraulic press (also known as an oil press) utilizes the static pressure of liquid to process products such as metal, plastic, rubber, wood, and powders. It is commonly used in pressing and forming processes such as forging, stamping, cold extrusion, straightening, bending, flanging, sheet metal drawing, powder metallurgy, and press fitting. Based on Pascal's law, these machines utilize liquid pressure to transmit the force. There are many different types of hydraulic presses, and their applications vary greatly depending on the specific needs. For example, they can be categorized into two main types: oil presses and water presses, depending on the type of liquid used to transmit the pressure.

[0003] Existing hydraulic presses generally use single-layer cylinders to reduce vibration of machine tools during blanking processing. The pressure used for large-tonnage presses is high, and the cylinder diameter is relatively large, requiring a larger installation space. As a result, the space and machine tools must be relatively larger, and manufacturing costs increase. Utility Model Content

[0004] The purpose of the utility model is to solve the above deficiencies in the prior art and to provide a hydraulic press nitrogen buffer cylinder.

[0005] A hydraulic press nitrogen buffer cylinder includes at least two cylinders. The cylinders are used to buffer the sliding process of a slider. The gas filled in the cylinders is nitrogen. The cylinders include a cylinder body, a piston, and a piston rod. The cylinder body is provided with a piston, which is fixedly connected to the piston rod. An air inlet is provided on the bottom side wall of the cylinder body.

[0006] Preferably, the cylinder body includes a cylinder wall, a base, and an upper cover. The cylinder wall is a cylindrical structure, and the upper end opening of the cylinder wall is embedded with the upper cover. The upper opening of the inner wall of the cylinder wall is provided with an annular groove for installing the upper cover. The upper end surface of the base is provided with a positioning protrusion, which is inserted into the lower end opening of the cylinder wall.

[0007] Preferably, one end of the piston rod is inserted into the piston, and a U-shaped seal and a sealing ring are provided between the inner wall of the piston and the outer wall of the piston rod.

[0008] Preferably, the piston rod is movably inserted into the upper cover, and a wear-resistant ring and a U-shaped sealing member are provided between the outer side wall of the piston rod and the inner side wall of the upper cover.

[0009] Beneficial Effects: Compared with existing technologies, the present invention can completely replace the current hydraulic press buffer system, eliminating the need for external piping and electricity consumption, saving energy and reducing emissions, and being more environmentally friendly. Because the nitrogen cylinder is filled with nitrogen, its inertness prevents internal oxidation of components and aging of seals, thereby increasing the service life of components. Due to the characteristics of the nitrogen cylinder (compressed nitrogen has a higher pressure), the internal pressure can be increased, and the component can be manufactured smaller (with a smaller inner diameter) than conventional air balance cylinders, reducing component manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the assembly of a hydraulic press buffer nitrogen cylinder on a hydraulic press;

[0011] Figure 2 It is a schematic diagram of a hydraulic press buffer nitrogen cylinder;

[0012] 1. Slider, 2. Cylinder, 3. Cylinder wall, 4. Upper cover, 5. Piston rod, 6. Piston, 7. Wear ring, 8. U-shaped seal, 9. Sealing ring, 10. Base, 11. Positioning protrusion.

[0013] In the figure, DETAILED DESCRIPTION

[0014] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0015] like Figure 1-2 As shown, the slider 1, the cylinder 2, the cylinder wall 3, the upper cover 4, the piston rod 5, the piston 6, the wear ring 7, the U-shaped seal 8, the sealing ring 9, the base 10, and the positioning protrusion 11;

[0016] A hydraulic press buffer nitrogen cylinder includes two cylinders 2. The cylinders 2 are used to buffer the sliding process of a slider 1. The gas filled in the cylinders 2 is nitrogen. The cylinders 2 include a cylinder body, a piston 6, and a piston rod 5. The cylinder body is provided with a piston 6, which is fixedly connected to the piston rod 5. An air inlet is provided on the bottom side wall of the cylinder body.

[0017] Preferably, the cylinder body includes a cylinder wall 3, a base 10, and an upper cover 4. The cylinder wall 3 is a cylindrical structure. The upper end opening of the cylinder wall 3 is embedded with the upper cover 4. The upper opening of the inner wall of the cylinder wall 3 is provided with an annular groove for installing the upper cover 4. The upper end surface of the base 10 is provided with a positioning protrusion 11, which is inserted into the lower end opening of the cylinder wall 3. It should be noted that the base 10 is fixed to the press by bolts.

[0018] Preferably, one end of the piston rod 5 is passed through the piston 6, and a U-shaped seal 8 and a sealing ring 9 are provided between the inner wall of the piston 6 and the outer wall of the piston rod 5. It should be noted that the piston rod is passed through the center of the piston, and limiting nuts for fixing are provided above and below the piston respectively.

[0019] Preferably, the piston rod 5 is movably inserted into the upper cover 4 , and a wear-resistant ring 7 and a U-shaped seal 8 are provided between the outer wall of the piston rod 5 and the inner wall of the upper cover 4 .

[0020] Instructions for use: When in use, the air tightness of the nitrogen balance system must be ensured (no air leakage). After calculation, fill it with nitrogen at a certain pressure. Of course, the nitrogen pressure is related to the weight of the slider and the lower mold installed under the slider. (Pre-calculated) The pushing force of the two nitrogen cylinders is exactly equal to the sum of the weight of the slider and the lower mold, which is equivalent to a force equal to the gravity of the slider that keeps pushing the slider to achieve a horizontal position.

[0021] Example of nitrogen pressure calculation: According to the pressure formula F=PS, S is the pressure area, which here refers to the cross-sectional area of the nitrogen cylinder piston; P is the pressure, which here refers to the pressure of the nitrogen filling; F is the pressure, which here refers to the gravity of the slider and the lower mold, and also refers to the top force of the nitrogen cylinder 2.

[0022] Assumptions: The piston diameter of the nitrogen cylinder is 80 mm, the weight of the press slide and lower die is 1200 kg, and the nitrogen pressure of two nitrogen cylinders is calculated.

[0023] 1200kg is equivalent to 1200×9.8=11760 Newtons (1kg is equivalent to 9.8 Newtons).

[0024] Two nitrogen cylinders pushing force: F = 11760 N

[0025] Pressure area: S = 40 × 40 × 3.14 × 2 = 10048 mm 2 .

[0026] According to P=F / S, P=11760 / 10048=1.17N / mm 2 , that is 1.17MPa.

[0027] The nitrogen pressure filled into a single nitrogen cylinder is 1.17MPa, which is generally multiplied by a safety factor of about 1.2, 1.17×1.2≈1.4MPa.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic press nitrogen buffer cylinder, characterized in that: It includes at least two cylinders, which are used to cushion the sliding process of the slider. The gas filled in the cylinder is nitrogen. The cylinder includes a cylinder body, a piston, and a piston rod. The cylinder body is provided with a piston, which is fixedly connected to the piston rod. The bottom side wall of the cylinder body is provided with an air inlet hole.

2. A hydraulic press nitrogen buffer cylinder according to claim 1, characterized in that: The cylinder body includes a cylinder wall, a base, and an upper cover. The cylinder wall is a cylindrical structure, and the upper end opening of the cylinder wall is embedded with the upper cover. The upper opening of the inner wall of the cylinder wall is provided with an annular groove for installing the upper cover. The upper end surface of the base is provided with a positioning protrusion, which is inserted into the lower end opening of the cylinder wall.

3. A hydraulic press nitrogen buffer cylinder according to claim 2, characterized in that: One end of the piston rod is inserted into the piston, and a U-shaped sealing member and a sealing ring are provided between the inner wall of the piston and the outer wall of the piston rod.

4. The hydraulic press nitrogen buffer cylinder according to claim 2, characterized in that: The piston rod is movably arranged in the upper cover, and a wear-resistant ring and a U-shaped sealing member are arranged between the outer wall of the piston rod and the inner wall of the upper cover.

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