Equal-force oil cylinder

Abstract

The utility model discloses an equal-force oil cylinder which comprises a cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod and a retraction oil opening formed in the axial rear side of the guide sleeve, and the front end of the piston rod penetrates through the guide sleeve in a sliding mode. An axially-positioned sleeve is arranged in the cylinder barrel, the rear end of the piston rod penetrates through the sleeve in a sliding mode, and a sealing piece is arranged on the inner circle of the sleeve. A front piston and a rear piston which are connected are fixedly arranged in the middle of the piston rod on the front side of the sleeve, an extending oil port is formed in the cylinder barrel on the front side of the sleeve, sealing rings are arranged on the outer circles of the front piston and the rear piston, the outer diameters of the piston rods on the two axial sides of the front piston and the rear piston are equal, and the radial cross sectional areas of the front piston and the rear piston are equal. The utility model discloses can realize piston rod extension and retraction push force and pull force equal, can be used for specific working condition, need not to carry out other adjustment, convenient to use.

Description

Technical Field

[0001] The utility model relates to an isoforce oil cylinder, in particular to an isoforce torsion oil cylinder. Background Art

[0002] Existing oil cylinders all include a connected cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod, a piston, and an extension oil port and a retraction oil port arranged in the cylinder barrel on both sides of the piston; due to the presence of the piston rod, the cross-sectional area of ​​the extension chamber is larger than the cross-sectional area of ​​the retraction chamber, resulting in the thrust of the piston rod extending being larger than the pulling force when retracting. For some working conditions that require equal thrust and pulling force, such as the torsion oil cylinder for a shield machine, the oil pressure needs to be adjusted to achieve this, which is inconvenient to use. Summary of the invention

[0003] The purpose of the utility model is to provide an equal force oil cylinder in view of the above-mentioned deficiencies in the prior art, which can achieve equal thrust and pull when the piston rod is extended and retracted, can be used in specific working conditions without other adjustments, and is easy to use.

[0004] To achieve the above-mentioned purpose, the utility model provides an equal-force oil cylinder, comprising a connected cylinder bottom, a cylinder barrel and a guide sleeve, a piston rod, a retraction oil port arranged on the axial rear side of the guide sleeve, and the front end of the piston rod slides through the guide sleeve; it is characterized in that an axially positioned sleeve is arranged in the cylinder barrel, the rear end of the piston rod slides through the sleeve, and a sealing member is arranged on the inner circle of the sleeve; a connected front piston and a rear piston are fixedly arranged in the middle of the piston rod on the front side of the sleeve, an extension oil port is arranged in the cylinder barrel on the front side of the sleeve, sealing rings are arranged on the outer circles of the front piston and the rear piston, the outer diameters of the piston rods on both axial sides of the front piston and the rear piston are equal, and the radial cross-sectional areas of the front piston and the rear piston are equal.

[0005] When in use, when the oil port is extended to inlet oil, the oil pressure cannot enter the sleeve and act on the rear end of the piston rod, but can only act on the rear piston. The outer diameters of the piston rods on both sides of the axial direction of the front piston and the rear piston are equal, and the radial cross-sectional areas of the front piston and the rear piston are equal, so that the thrust and pull of the piston rod extension and retraction are equal. It can be used in specific working conditions without the need for oil pressure adjustment, and is easy to use;

[0006] As a further improvement of the utility model, a ring groove is provided in the middle of the piston rod, a key is provided in the ring groove, and the radial inner ends of the front piston and the rear piston are clamped on both sides of the key and fixedly connected by several screws; it is convenient to install and fix the front piston and the rear piston;

[0007] As a further improvement of the utility model, the sleeve is provided with a limiting ring groove, the cylinder is connected with a plurality of radial set screws, and the inner ends of the set screws are placed in the limiting ring groove; the axial positioning of the sleeve can be conveniently realized;

[0008] As a further improvement of the utility model, the inner circle of the sleeve at the axial rear side of the seal is provided with a degassing groove, the sleeve and the cylinder are provided with an exhaust hole communicated with the degassing groove, and a breathable valve is provided in the exhaust hole; this can ensure the smooth movement of the piston rod and prevent impurities from entering the cylinder;

[0009] In summary, the utility model can achieve equal thrust and pull forces when the piston rod is extended and retracted, can be used in specific working conditions without other adjustments, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the front view of the embodiment of the utility model. DETAILED DESCRIPTION

[0011] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0012] like Figure 1 As shown, an equal force oil cylinder of this embodiment comprises a connected cylinder bottom 1, a cylinder barrel 2 and a guide sleeve 3, a piston rod 4, and a retracting oil port 5 arranged at the axial rear side of the guide sleeve, and the front end of the piston rod 4 slides through the guide sleeve 3; a sleeve 7 is arranged at the rear part of the cylinder barrel 2, and the sleeve 7 is provided with a limiting ring groove, and the cylinder barrel 2 is connected to a plurality of radial set screws 8 through threads, and the inner ends of the set screws 8 are placed in the limiting ring grooves, so as to realize the axial positioning of the sleeve 7;

[0013] The rear end of the piston rod 4 slides through the sleeve 7, and a sealing component 9 is provided on the inner circle of the sleeve 7. The inner circle of the sleeve on the axial rear side of the sealing component 9 is provided with a degassing groove 10, and the sleeve 7 and the cylinder barrel 2 are provided with an exhaust hole 11 communicated with the degassing groove 10, and a breathable valve 12 is provided in the exhaust hole 11; an annular groove is provided in the middle of the piston rod 4 on the front side of the sleeve 7, and a key 13 is provided in the annular groove. The radial inner ends of the front piston 14 and the rear piston 15 are clamped on both sides of the key 13 through the notch and are fixedly connected by a number of screws 16, and an oil extension port 6 is provided in the cylinder barrel 2 on the front side of the sleeve 7. Sealing rings 17 are provided on the outer circles of the front piston 14 and the rear piston 15. The outer diameters of the piston rods on both sides of the axial direction of the front piston 14 and the rear piston 15 are equal, and the radial cross-sectional areas of the front piston 14 and the rear piston 15 are equal.

[0014] When in use, when oil is introduced through the extended oil port 6, the oil pressure cannot enter the sleeve 7 and act on the rear end of the piston rod 4, and can only act on the rear piston 15. When oil is introduced through the retracted oil port 5, it can only act on the front piston 14. The outer diameters of the piston rod 4 are equal and the radial cross-sectional areas of the front piston 14 and the rear piston 15 are equal, so that the thrust and pulling forces of extending and retracting the piston rod 4 are equal. It can be used in specific working conditions without the need for oil pressure adjustment, and is easy to use. The key 13 facilitates the installation and fixation of the front piston 14 and the rear piston 15. The air release groove 10 and the exhaust hole 11 can ensure smooth movement of the piston rod, and the air vent 12 can prevent impurities from entering the cylinder 2.

Claims

1. An isobaric oil cylinder, comprising a connected cylinder bottom, a cylinder barrel and a guide sleeve, a piston rod, and a retracting oil port arranged on the axial rear side of the guide sleeve, wherein the front end of the piston rod slides through the guide sleeve; characterized in that An axially positioned sleeve is provided in the cylinder barrel, the rear end of the piston rod slides through the sleeve, and a seal is provided on the inner circle of the sleeve; a connected front piston and a rear piston are fixedly provided in the middle of the piston rod on the front side of the sleeve, an oil extension port is provided in the cylinder barrel on the front side of the sleeve, and sealing rings are provided on the outer circles of the front piston and the rear piston, the outer diameters of the piston rods on both axial sides of the front piston and the rear piston are equal, and the radial cross-sectional areas of the front piston and the rear piston are equal.

2. The isotropic cylinder according to claim 1, characterized in that An annular groove is arranged in the middle of the piston rod, a clamping key is arranged in the annular groove, and the radial inner ends of the front piston and the rear piston are clamped on both sides of the clamping key and are fixedly connected by a plurality of screws.

3. An isotropic cylinder as claimed in claim 1 or 2, characterized in that The sleeve is provided with a limiting ring groove, and the cylinder is connected with a plurality of radial fixing screws, and the inner ends of the fixing screws are placed in the limiting ring groove.

4. An isotropic cylinder as claimed in claim 3, characterized in that The inner circle of the sleeve at the axial rear side of the sealing member is provided with a degassing groove, the sleeve and the cylinder are provided with an exhaust hole communicated with the degassing groove, and a breathable valve is provided in the exhaust hole.

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