Three-position deflection oil cylinder

Abstract

The three-position deflection oil cylinder comprises a large piston rod and a small piston rod, the top end of the large piston rod is connected with a large piston through threads, the top end of the small piston rod is connected with a small piston through threads, the large piston and the small piston are located in a cylinder body, and an oil cylinder upper base and an oil cylinder lower base are arranged at the two ends of the cylinder body respectively. The small piston rod is sleeved with the oil cylinder upper base, the large piston rod is sleeved with the oil cylinder lower base, a first oil inlet is formed in the center of the top of the oil cylinder upper base, a third oil inlet is formed in the center of the top of the oil cylinder lower base, and a second oil inlet is formed in the center of the top of the surface of the cylinder body. In the moving process of the oil cylinder, balance and stability can be achieved, the structure is simpler, machining is more convenient, accurate control over multiple strokes can be achieved, the structure is safer, intercommunication oil mixing and pressure relief of a middle-position oil port in the oil cylinder can be well prevented through the adopted sealing mode, and the function failure of the oil cylinder after oil mixing is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a three-position tilt oil cylinder. Background Art

[0002] The three-position control cylinder is an important development trend nowadays. It can realize the control action of three positions with a single hydraulic cylinder and is simpler in structure. However, the three-port cylinders commonly used in the market now have problems such as complex structure, uncontrollable control method and displacement. For this reason, the utility model provides a three-position yaw cylinder with simple structure, high controllability and simple control. Utility Model Content

[0003] The purpose of the utility model is to provide a three-position tilting oil cylinder to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a three-position sway oil cylinder, comprising a large piston rod and a small piston rod, the top end of the large piston rod is connected to the large piston by a thread, the top end of the small piston rod is connected to the small piston by a thread, the large piston and the small piston are located inside the cylinder body, and the two ends of the cylinder body are respectively provided with an oil cylinder upper seat and an oil cylinder lower seat, the oil cylinder upper seat is sleeved at the small piston rod, and the oil cylinder lower seat is sleeved at the large piston rod, second fastening bolts are provided at both ends of the outer surface of the oil cylinder upper seat, the second fastening bolts fix the oil cylinder upper seat to one side of the cylinder body, first fastening bolts are provided at both ends of the outer surface of the oil cylinder lower seat, the first fastening bolts fix the oil cylinder lower seat to the other side of the cylinder body, a first oil inlet is opened at the top center of the oil cylinder upper seat, a third oil inlet is opened at the top center of the oil cylinder lower seat, and a second oil inlet is opened at the top center of the surface of the cylinder body.

[0005] Preferably, a second elastic retaining spring is provided on the inner side surface of the large piston, and the second elastic retaining spring is sleeved on the large piston rod.

[0006] Preferably, a first elastic retaining ring is provided on the inner side surface of the small piston, and the first elastic retaining ring is sleeved on the small piston rod.

[0007] Preferably, a plurality of sealing rings are sleeved on the outer surfaces of the large piston and the small piston.

[0008] Preferably, the large piston rod and the small piston rod are sleeved with a plurality of sealing rings located on the cylinder body, the upper seat of the oil cylinder and the lower seat of the oil cylinder.

[0009] Preferably, the large piston rod is sleeved with a first locking nut and a second locking nut on the outer side of the lower seat of the oil cylinder, and the first locking nut and the second locking nut are in close contact with each other.

[0010] Preferably, the small piston rod is sleeved with a third locking nut on the outer side of the oil cylinder upper seat.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The three-position tilting oil cylinder of the utility model can strictly control the oil cylinder stroke, can achieve balance and stability during the movement of the oil cylinder, has a simpler structure, is more convenient to process, and can realize precise control of multiple strokes.

[0013] The three-position tilting oil cylinder of the utility model is safer in structure, and the adopted sealing method can well prevent oil from being communicated with each other in the oil cylinder, and the middle oil port is depressurized, which effectively prevents the oil cylinder from malfunctioning due to oil being communicated with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side structural schematic diagram of the utility model;

[0015] Figure 2 Another side structural diagram of the utility model;

[0016] Figure 3 It is a cross-sectional view of the utility model.

[0017] In the figure: 1. cylinder body; 2. large piston; 3. small piston; 4. lower seat of oil cylinder; 5. upper seat of oil cylinder; 6. first locking nut; 7. second locking nut; 8. third locking nut; 9. large piston rod; 10. small piston rod; 11. first elastic retaining spring; 12. second elastic retaining spring; 13. first oil inlet; 14. second oil inlet; 15. third oil inlet; 16. first fastening bolt; 17. second fastening bolt. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1-3 The utility model provides a technical solution: a three-position sway oil cylinder, comprising a large piston rod 9 and a small piston rod 10, the top of the large piston rod 9 is connected to a large piston 2 by a thread, the top of the small piston rod 10 is connected to a small piston 3 by a thread, the large piston 2 and the small piston 3 are located inside a cylinder body 1, and an oil cylinder upper seat 5 and an oil cylinder lower seat 4 are respectively provided at two ends of the cylinder body 1, the oil cylinder upper seat 5 is sleeved on the small piston rod 10, and the oil cylinder lower seat 4 is sleeved on the large piston rod 9, and second fastening bolts 17 are provided at both ends of the outer surface of the oil cylinder upper seat 5, and the second fastening bolts 17 fix the oil cylinder upper seat 5 to one side of the cylinder body 1, and first fastening bolts 16 are provided at both ends of the outer surface of the oil cylinder lower seat 4, and the first fastening bolts 16 fix the oil cylinder lower seat 4 to the other side of the cylinder body 1, and a first oil inlet 13 is provided at the top center of the oil cylinder upper seat 5, a third oil inlet 15 is provided at the top center of the oil cylinder lower seat 4, and a second oil inlet 14 is provided at the top center of the surface of the cylinder body 1.

[0022] Furthermore, a second elastic retaining spring 12 is provided on the inner side surface of the large piston 2 , and the second elastic retaining spring 12 is sleeved on the large piston rod 9 .

[0023] Furthermore, a first elastic retaining spring 11 is provided on the inner side surface of the small piston 3 , and the first elastic retaining spring 11 is sleeved on the small piston rod 10 .

[0024] Furthermore, a plurality of sealing rings are sleeved on the outer surfaces of the large piston 2 and the small piston 3 .

[0025] Furthermore, the large piston rod 9 and the small piston rod 10 are partially sleeved with a plurality of sealing rings located on the cylinder body 1, the oil cylinder upper seat 5, and the oil cylinder lower seat 4.

[0026] Specifically, sealing rings are arranged at the large piston 2, the small piston 3, the large piston rod 9, and the small piston rod 10, which can effectively prevent oil from flowing into the oil cylinder and relieve pressure at the middle oil port, effectively preventing the oil cylinder from malfunctioning due to oil flowing.

[0027] Furthermore, the large piston rod 9 is sleeved with a first locking nut 6 and a second locking nut 7 on the outer side of the oil cylinder lower seat 4, and the first locking nut 6 and the second locking nut 7 are in close contact with each other.

[0028] Furthermore, the small piston rod 10 is sleeved with a third locking nut 8 on the outer side of the oil cylinder upper seat 5 .

[0029] Working principle: when the large piston 2 needs to work, hydraulic oil is poured into the third oil inlet 15, and the hydraulic oil will reach the large piston 2 from the third oil inlet 15. The large piston 2 is provided with an oil inlet groove, and the hydraulic oil will enter the oil inlet groove, so that the pressure on the piston is uniform at all places during movement, and the large piston 2 can move smoothly. A limit step is provided inside the cylinder body 1, which can strictly control the stroke of the large piston 2, and the staff can change the shape of the limit step according to the requirements of the stroke.

[0030] A second oil inlet 14 is provided at the cylinder body 1. When hydraulic oil is poured into the second oil inlet 14, the large piston 2 and the small piston 3 will return to their initial positions, and the stroke of this position is strictly controlled by the cylinder lower seat 4 and the cylinder upper seat 5.

[0031] Hydraulic oil is poured into the first oil inlet 13 and the same hydraulic oil is poured into the third oil inlet 15 at the same time. The large piston 3 will act as a limiter to ensure the stroke of the large piston 2 and the small piston 3. When hydraulic oil is only poured into the first oil inlet 13, the small piston 3 will push the large piston 2 against the lower seat 4 of the cylinder to form a second control position, which can meet the demand for variable stroke.

[0032] It should be noted that the connection between the large piston 2 and the large piston rod 9 and the small piston 3 and the small piston rod 10 are both threaded connections. The threaded connection is the simplest mode among the current mainstream connection methods, but the traditional threaded connection will appear continuous loosening during operation. Common methods of loosening include welding, bushings, etc., but in the actual processing process, there are more processing sequences and it is more complicated. The utility model is based on the threaded connection and is provided with a second elastic retaining spring 12 on the inner side of the large piston 2, and the second elastic retaining spring 12 is sleeved on the large piston rod 9. The inner side of the small piston 3 is provided with a first elastic retaining spring 11, and the first elastic retaining spring 11 is sleeved on the small piston rod 10. The thread ensures strength, and the retaining spring is used to prevent loosening. The structure is simple and the processing method is relatively simple. At the same time, the components used are all standard parts, which are more competitive in cost.

[0033] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-position tilting oil cylinder, comprising a large piston rod (9) and a small piston rod (10), characterized in that: The top end of the large piston rod (9) is connected to the large piston (2) via a thread, and the top end of the small piston rod (10) is connected to the small piston (3) via a thread. The large piston (2) and the small piston (3) are located inside the cylinder body (1). The two ends of the cylinder body (1) are respectively provided with an upper cylinder seat (5) and a lower cylinder seat (4). The upper cylinder seat (5) is sleeved on the small piston rod (10), and the lower cylinder seat (4) is sleeved on the large piston rod (9). Second fastening bolts ( 17), the second fastening bolt (17) fixes the upper seat (5) of the oil cylinder to one side of the cylinder body (1), the first fastening bolts (16) are arranged at both ends of the outer surface of the lower seat (4) of the oil cylinder, the first fastening bolts (16) fix the lower seat (4) of the oil cylinder to the other side of the cylinder body (1), the top center of the upper seat (5) of the oil cylinder is provided with a first oil inlet (13), the top center of the lower seat (4) of the oil cylinder is provided with a third oil inlet (15), and the top center of the surface of the cylinder body (1) is provided with a second oil inlet (14).

2. A three-position tilt cylinder according to claim 1, characterized in that: A second elastic retaining spring (12) is provided on the inner side surface of the large piston (2), and the second elastic retaining spring (12) is sleeved on the large piston rod (9).

3. The three-position tilting cylinder according to claim 1, characterized in that: The inner side surface of the small piston (3) is provided with a first elastic retaining spring (11), and the first elastic retaining spring (11) is sleeved on the small piston rod (10).

4. The three-position tilting cylinder according to claim 1, characterized in that: The outer surfaces of the large piston (2) and the small piston (3) are sleeved with a plurality of sealing rings.

5. The three-position tilt cylinder according to claim 1, characterized in that: The large piston rod (9) and the small piston rod (10) are partially sleeved and provided with a plurality of sealing rings located on the cylinder body (1), the oil cylinder upper seat (5) and the oil cylinder lower seat (4).

6. The three-position tilt cylinder according to claim 1, characterized in that: The large piston rod (9) is sleeved with a first locking nut (6) and a second locking nut (7) on the outer side of the oil cylinder lower seat (4), and the first locking nut (6) and the second locking nut (7) are in close contact with each other.

7. The three-position tilting cylinder according to claim 1, characterized in that: The small piston rod (10) is sleeved with a third locking nut (8) on the outer side of the oil cylinder upper seat (5).

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