Multi-piston jack

Abstract

A multi-piston jack comprises a cylinder body, and the cylinder body is a steel cylinder provided with a plurality of cylinder holes distributed in the circumferential direction and a center cylinder hole. The jack further comprises a cylinder bottom, a cylinder cover, a piston and a piston rod. The jack is provided with a structure of a plurality of pistons, has the advantages of being low in body height, light in weight, good in integrity, convenient to connect and install and reasonable in stress point distribution, and can control the number of the working pistons through the valves connected to the oil ways of the cylinder holes to achieve conversion of different thrust.

Description

Technical Field

[0001] The invention relates to a jack, in particular to a multi-piston jack. Background Art

[0002] The existing jacks are single-cylinder and single-piston structures. Since the tonnage of the jack is determined by the inner diameter of the oil cylinder, that is, the diameter of the piston, under the condition of a certain system working pressure, the thrust of a single jack can only be increased by increasing the inner diameter of the oil cylinder and the diameter of the piston. The larger the inner diameter of the oil cylinder, the thicker the cylinder wall, the heavier the weight of the single unit, the more difficult it is to process, and the higher the manufacturing cost. At the same time, in order to ensure the stability of the jack, the guide length required must also be increased accordingly, and the height of the jack body will also increase accordingly. In addition, a single jack means a single point of force, which is not conducive to the improvement of mechanical strength. In order to meet the needs of huge thrust in engineering practice, sometimes a working mode of multiple jacks of the same model with relatively small thrust in parallel is adopted. Although this parallel working mode of multiple jacks of the same model can compensate to a certain extent for the shortcomings of using a single jack, such as high manufacturing cost, excessive height of the body, and difficulty in improving mechanical strength, it also has some shortcomings: 1. The connection and installation of multiple jacks are cumbersome and not suitable for occasions that require repeated disassembly and installation; 2. The integrity is poor, the structure is not compact enough, and the stress points are too dispersed. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention proposes a multi-piston jack. The present invention has a low body height, compact structure, and light weight. One jack has multiple pistons, which not only avoids the cumbersome connection and installation procedures of multiple jacks, but also prevents the force points from being too dispersed. In addition, the present invention can control the number of working pistons through the oil circuit valves connected to each cylinder hole to achieve the conversion of different thrusts.

[0004] In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions: A multi-piston jack has multiple pistons. The jack comprises a cylinder body, which is a steel cylinder with multiple cylinder holes distributed along the circumference and a central cylinder hole. The jack also comprises a cylinder bottom, a cylinder cover, a piston and a piston rod.

[0005] The beneficial effects of the present invention are: 1) The jack of the present invention has multiple pistons, a low body height, a compact structure, a light weight, is easy to install and use, and has a reasonable distribution of force points.

[0006] 2) The present invention can control the number of working pistons through valves connected to the oil circuits of each cylinder hole to achieve conversion of different thrusts. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 is a schematic diagram of the full cross-sectional structure of the present invention. Figure 2 for Figure 1 Top view The meanings of the marks in the figure are as follows: 1- cylinder bottom 2- cylinder body 3- piston 4- cylinder head 5- piston rod Implementation

[0008] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0009] like Figures 1-2 As shown, a multi-piston jack includes a cylinder body 2, which is a steel cylinder with multiple cylinder holes distributed along the circumferential direction and a central cylinder hole. The jack also includes a cylinder bottom 1, a piston 3, a cylinder cover 4 and a piston rod 5.

[0010] The working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0011] like Figure 1 As shown, when the jack is working, hydraulic oil is input to the bottom of each cylinder hole to make the piston 3 rise. When the piston rod 5 reaches the force application point, the oil pressure increases and the thrust increases. When the piston 3 needs to be retracted, hydraulic oil is input to the top of each cylinder hole. The number of working pistons 3 is controlled by the oil circuit valve connected to each cylinder hole to achieve the conversion of different thrusts.

Claims

1. A multi-piston jack, characterized in that: The jack comprises a cylinder body (2), wherein the cylinder body (2) is a steel cylinder having a plurality of cylinder holes distributed along the circumferential direction and a central cylinder hole; the jack also comprises a cylinder bottom (1), a cylinder cover (4), a piston (3) and a piston rod (5).

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