Double-section output oil cylinder

Abstract

A double-section output oil cylinder comprises a cylinder barrel, an oil inlet and outlet, a plunger rod, a piston and a wear-resisting positioning piece, the cylinder barrel is in a hollow cylinder shape with an opening in the upper end, and the oil inlet and outlet is formed in the side wall of the cylinder barrel and communicated with the interior of the cylinder barrel; the wear-resistant positioning piece is fixedly connected to the opening of the cylinder barrel, and a through hole is formed in the wear-resistant positioning piece; the piston is arranged in the cylinder barrel, the communicating position of the oil inlet and outlet and the interior of the cylinder barrel is located below the piston, the piston is provided with a channel, the plunger rod penetrates through the channel of the piston and is supported by the piston, and the outer diameter of the piston is larger than the inner diameter of the through hole. The double-section output oil cylinder disclosed by the utility model is provided with the wear-resistant positioning piece, so that the piston and the plunger rod can rise to do work in stages, and the effects of providing higher pressure for equipment in a starting stage and providing higher jacking speed after starting are achieved.

Description

Technical Field

[0001] The utility model relates to a hydraulic oil cylinder, in particular to a double-stage output oil cylinder. Background Art

[0002] In actual production work, some equipment requires greater power during the startup phase and requires a faster jacking speed after startup. The power that the hydraulic system of the existing hydraulic cylinder can provide is limited and cannot meet the needs of different stages at the same time.

[0003] Therefore, a dual-stage output cylinder is needed that can generate different thrusts and speeds in two different jacking stages to meet specific work requirements. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to design a dual-stage output oil cylinder. By arranging a plunger rod, a wear-resistant positioning part and a piston, when the piston rises to the wear-resistant positioning part, the plunger rod continues to rise, and different thrusts and speeds can be generated in two different jacking stages.

[0005] To achieve the above-mentioned purpose, the utility model provides a two-stage output oil cylinder, including a cylinder barrel, an oil inlet and outlet, a plunger rod, a piston and a wear-resistant positioning piece. The cylinder barrel is a hollow cylindrical shape with an opening at the upper end, and the oil inlet and outlet are opened on the side wall of the cylinder barrel and connected with the interior of the cylinder barrel; the wear-resistant positioning piece is fixedly connected to the opening of the cylinder barrel, and the wear-resistant positioning piece is provided with a through hole; the piston is arranged inside the cylinder barrel, and the connection between the oil inlet and outlet and the interior of the cylinder barrel is located below the piston, and the piston is provided with a channel, and the plunger rod is provided with a first column and a second column with a cross-sectional area smaller than the first column, the first column moves through the through hole of the wear-resistant positioning piece, the second column moves through the channel of the piston and the piston supports the first column, and the outer diameter of the piston is larger than the inner diameter of the through hole.

[0006] Furthermore, the cylinder is provided with a first cavity and a second cavity from top to bottom, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, and the outer diameter of the piston is smaller than the inner diameter of the first cavity and larger than the inner diameter of the second cavity.

[0007] Furthermore, the outer diameter of the piston is smaller than or equal to the inner diameter of the first cavity, and the outer diameter of the piston is larger than the inner diameter of the second cavity.

[0008] Furthermore, oil seals are embedded on both the outer and inner surfaces of the piston.

[0009] Furthermore, a plurality of oil seals arranged at intervals up and down are embedded on both the outer and inner surfaces of the piston.

[0010] Further, the inner wall of the channel of the piston is provided with a wear-resistant ring.

[0011] Further, the wear-resistant rings are arranged in multiple layers.

[0012] After the technical scheme is adopted, the beneficial effects of the utility model are as follows: the double-stage output oil cylinder of the utility model can realize the stage-by-stage ascending work of the piston and the plunger rod due to the wear-resistant positioning member, so that the effect of providing large pressure for the equipment in the starting stage and providing fast jacking speed after starting can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 FIG. 1 is a schematic view of the double-stage output oil cylinder according to the utility model;

[0014] Figure 2 FIG. 2 is a schematic view of the double-stage output oil cylinder in the first stage according to the utility model;

[0015] Figure 3 FIG. 3 is a schematic view of the double-stage output oil cylinder in the second stage according to the utility model.

[0016] The reference signs are as follows: 1, oil inlet and outlet; 2, cylinder barrel; 3, plunger rod; 4, piston; 5, wear-resistant positioning member; 6, oil seal; 7, hydraulic oil; 8, wear-resistant ring. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be further described below through embodiments:

[0018] The utility model provides a kind of double-stage output oil cylinder, as shown in FIG. Figure 1 It includes cylinder barrel 2, oil inlet and outlet 1, plunger rod 3, piston 4 and wear-resistant positioning member 5. Cylinder barrel 2 is hollow cylindrical with upper end opening. Oil inlet and outlet 1 is arranged on the side wall of cylinder barrel 2 and communicates with the inside of cylinder barrel 2, and wear-resistant positioning member 5 is arranged at the opening of cylinder barrel 2, and wear-resistant positioning member 5 is provided with through hole. Piston 4 is arranged in the inside of cylinder barrel, and the communication between oil inlet and outlet 1 and the inside of cylinder barrel 2 is below piston 4, and piston 4 is provided with channel, plunger rod 3 is provided with first cylinder and second cylinder with smaller cross-sectional area, first cylinder passes through the through hole of wear-resistant positioning member 5, second cylinder passes through the channel of piston 4 and piston supports first cylinder, and the outer diameter of piston 4 is larger than the inner diameter of the through hole.

[0019] In the embodiment, plunger rod 3 is composed of two coaxial cylinders, and the radius of first cylinder is larger than that of second cylinder, and correspondingly, piston 4 is provided with cylindrical channel, and the radius of first cylinder is larger than that of channel, and in other embodiments, plunger rod 3 can also have other shapes as long as it can achieve the effect of double-stage output.

[0020] Preferably, a wear-resistant ring 8 is arranged on the inner wall of the channel of the piston 4, so that the plunger rod 3 can slide along the piston 4 in the channel of the piston 4 in the axial direction of the piston 4, reducing the influence of resistance on the plunger rod 3.

[0021] Specifically, the cylinder barrel 2 is sequentially provided with a first cavity and a second cavity from the opening downward, the inner diameter of the first cavity is greater than the inner diameter of the second cavity, the outer diameter of the piston 4 is less than or equal to the inner diameter of the first cavity, and the outer diameter of the piston 4 is greater than the inner diameter of the second cavity, so as to ensure that the piston 4 does not block the inlet and outlet oil port 1, thereby ensuring the flow rate of the hydraulic oil 7 entering the cylinder barrel 2.

[0022] Specifically, the outer surface and the inner surface of the piston 4 are both embedded with oil seals 6. In this embodiment, the outer wall and the inner wall of the piston 4 are both embedded with two oil seals 6 arranged in an up-down spacing manner.

[0023] In actual application, in combination with Figures 2-3 As shown in the figure, the first stage: inject hydraulic oil 7 through the inlet and outlet oil port, the piston 4 will push the plunger rod 3 to lift, because the outer diameter of the piston 4 is larger than that of the plunger rod 3, so at this time the lifting force of the oil cylinder outward is large, when the piston 4 reaches the position of the wear-resistant positioning member 5, the piston 4 is stopped and no longer continues to lift outward. The second stage: the plunger rod 3 continues to lift outward, because the cross-sectional area of the plunger rod 3 is smaller than that of the piston 4, so at this time the lifting force of the oil cylinder outward is smaller, but the lifting speed becomes faster.

Claims

1. A double-stroke oil cylinder comprising a cylinder tube, an inlet and outlet port, a plunger rod, a piston and a wear-resistant positioning member, characterized in that: The cylinder is a hollow cylinder with an open upper end, the inlet and outlet port is arranged on the side wall of the cylinder and communicates with the inside of the cylinder; the wear-resistant positioning member is fixedly connected at the opening of the cylinder, the wear-resistant positioning member is provided with a through hole; the piston is arranged in the inside of the cylinder, the communication position of the inlet and outlet port with the inside of the cylinder is below the piston, the piston is provided with a channel, the plunger rod is provided with a first column and a second column with a smaller cross-sectional area, the first column passes through the through hole of the wear-resistant positioning member, the second column passes through the channel of the piston and supports the first column, the outer diameter of the piston is larger than the inner diameter of the through hole.

2. A dual output ram as defined in claim 1, wherein: The cylinder is sequentially provided with a first cavity and a second cavity from top to bottom, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, the outer diameter of the piston is smaller than the inner diameter of the first cavity and larger than the inner diameter of the second cavity.

3. The dual output cylinder of claim 1, wherein: The outer side surface and the inner side surface of the piston are both embedded with oil seals.

4. A dual output ram as defined in claim 3 wherein: The outer side surface and the inner side surface of the piston are both embedded with a plurality of oil seals arranged in an up-down spacing manner.

5. The dual output cylinder of claim 1 wherein: The channel inner wall of the piston is provided with a wear-resistant ring.

6. A dual output ram as defined in claim 5 wherein: There are a plurality of wear-resistant rings arranged in an up-down spacing manner.

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