Universal hydraulic nut

Abstract

The universal hydraulic nut comprises a hydraulic cylinder, a piston and a locking nut, an oil cavity of the hydraulic cylinder is connected with an external pump station through a flow channel, the piston is located in the oil cavity of the hydraulic cylinder and connected with the hydraulic cylinder in a sliding mode, the piston is of an annular structure and provided with an internal thread and an external thread, and the piston is connected with a bolt through the internal thread. The piston is connected with the locking nut through external threads, a base is arranged below the hydraulic cylinder, the upper end face of the base is a concave spherical face, the lower end face of the hydraulic cylinder is a convex spherical face, the upper end face of the base is matched with the lower end face of the hydraulic cylinder, and the hydraulic cylinder is movably arranged on the base. According to the universal hydraulic nut, through the inwards-concave spherical surface arranged on the upper end face of the base and the outwards-convex spherical surface arranged on the lower end face of the hydraulic cylinder, the hydraulic cylinder and the piston can be matched with the angle of the bolt to move on the base, it is guaranteed that the bolt is evenly stressed, locking is reliable, and threads of the bolt and the hydraulic nut are prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic nut, especially points to a universal hydraulic nut. BACKGROUND

[0002] The hydraulic nut is used for the bolt which needs to be frequently disassembled, the pre-tightening of the oversize bolt, the locking of the large workpiece and the like occasions.

[0003] Because the working condition of the nuclear power engineering is compact, the space is limited, if the mechanical nut is used, then the disassembly and installation of the nut need a large space, leading to the pre-tightening difficulty, so the hydraulic nut is more suitable.

[0004] The hydraulic nut is mainly composed of three parts, including the hydraulic cylinder, the piston and the locking nut, the piston is located in the hydraulic cylinder and is in sliding connection with the hydraulic cylinder, the piston is provided with the internal thread and the external thread, is connected with the bolt through the internal thread and is connected with the locking nut through the external thread.

[0005] Step 1: the piston in the hydraulic cylinder is pushed by the superhigh pressure oil, directly applying the external force to the bolt, so that the bolt subjected to the force is stretched in the elastic deformation zone;

[0006] Step 2: the locking nut is screwed after the bolt is stretched, so that the bolt is locked in the stretched position by the locking nut, then the hydraulic cylinder is depressurized, and the hydraulic oil flows back to the pump station.

[0007] The hydraulic nut is placed on the plane of the fastening piece in the use process, so that the bottom surface of the hydraulic nut is parallel to the plane of the fastening piece, and the bolt hole in the hydraulic nut is perpendicular to the plane, but the bolt for connection cannot reach the absolutely perpendicular state with the plane. INVENTION CONTENTS

[0008] The utility model aims at the basis on the existing hydraulic nut, based on the demand of improving the locking effect of the hydraulic nut and making the force of the locked hydraulic nut and bolt even, a universal hydraulic nut is constructed.

[0009] The universal hydraulic nut comprises a hydraulic cylinder, a piston and a locking nut, an oil cavity of the hydraulic cylinder is connected with an external pump station through a flow channel, the piston is located in the oil cavity of the hydraulic cylinder and is in sliding connection with the hydraulic cylinder, the piston is in annular structure and is provided with an inner thread and an outer thread, the piston is connected with a bolt through the inner thread, and the piston is connected with the locking nut through the outer thread, characterized in that a base is arranged below the hydraulic cylinder, an upper end surface of the base is provided as an inner concave spherical surface, a lower end surface of the hydraulic cylinder is provided as an outer convex spherical surface, the upper end surface of the base and the lower end surface of the hydraulic cylinder are matched with each other, and the hydraulic cylinder is movably arranged on the base; a bias load of ±1° exists between the hydraulic cylinder and the base to ensure that the pressure load is perpendicular to the working condition axis.

[0010] The hydraulic cylinder and the piston can be moved on the base at the angle of the bolt to make the axis of the hydraulic nut coincide with that of the bolt, thereby ensuring that the bolt is uniformly stressed.

[0011] A through hole is arranged on the base, and the diameter of the through hole is greater than that of the bolt, and the through hole is located at the middle position of the base.

[0012] Further, an oil cavity and a linkage cavity are arranged on the hydraulic cylinder, the oil cavity is communicated with the linkage cavity, the oil cavity is located above the linkage cavity, and the diameter of the oil cavity is greater than that of the linkage cavity.

[0013] Further, the piston comprises an upper part and a lower part, the diameter of the upper part is greater than that of the lower part, a sliding piece is arranged on the outer side of the upper part of the piston, the sliding piece is in sliding connection with the inner wall of the oil cavity, the outer thread of the piston is arranged on the outer side of the upper part of the piston, the outer thread of the piston is located above the sliding piece, and the lower part of the piston is in sliding connection with the linkage cavity.

[0014] A connecting hole penetrating up and down is arranged in the middle of the piston, the inner thread is arranged on the hole wall of the connecting hole, and the diameter of the connecting hole is equal to that of the bolt.

[0015] A groove is arranged on the piston, and the groove is communicated with the flow channel.

[0016] Further, a sealing piece is arranged below the sliding piece, and the sealing piece is a V-shaped spring energy storage ring. Compared with a common O-shaped sealing ring, the V-shaped spring energy storage ring has better sealing effect and longer service life, and can ensure a service life of 50 years.

[0017] Further, a plurality of connecting holes for connecting a screwing tool are arranged on the locking nut.

[0018] Further, the hydraulic nut is made of non-magnetic material, which can ensure the mechanical performance of the hydraulic nut.

[0019] The utility model discloses a beneficial effect lies in: the universal hydraulic nut of one kind disclosed in the application can be through the spherical surface of the upper end face recessed of the base and the spherical surface of the lower end face convex of the hydraulic cylinder, make the angle of hydraulic cylinder and piston can cooperate bolt moves on the base, make the axial line of hydraulic nut and bolt coincide, ensure that bolt stress is even, ensure locking reliable, prevent the damage of bolt and the thread of hydraulic nut.

[0020] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, features and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are shown, and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments or prior art of the utility model, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor;

[0022] Figure 1 It is the overall structure schematic diagram of a specific example of the utility model hydraulic nut;

[0023] Figure 2 It is Figure 1 The cross-sectional structure schematic diagram of;

[0024] Figure 3 It is the structure schematic diagram of the hydraulic cylinder in a specific example of the utility model hydraulic nut;

[0025] Figure 4 It is Figure 2 The structure enlarged view of A in;

[0026] Figure 5 It is the structure schematic diagram of locking nut in a specific example of the utility model hydraulic nut;

[0027] Figure 6 It is the cross-sectional structure schematic diagram of base in a specific example of the utility model hydraulic nut;

[0028] In the drawing: 101, base;102, hydraulic cylinder;103, interface;104, piston;105, locking nut;106, connecting hole;107, through hole;109, linkage cavity;110, flow channel;111, oil cavity;115, sliding piece;117, connecting hole;120, annular groove;121, V-shaped spring energy storage ring. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0030] The utility model makes further description of the universal hydraulic nut in combination with the drawings.

[0031] As shown in Figure 1 and Figure 2 , the hydraulic nut described in the embodiment is made of non-magnetic material, which comprises a base 101, a hydraulic cylinder 102, a piston 104 and a locking nut 105, the hydraulic cylinder 102 is arranged above the base 101, the hydraulic cylinder 102 is connected with a hydraulic oil interface 103, and the hydraulic cylinder 102 is connected with an external pump station through the interface 103, the piston 104 is arranged in the hydraulic cylinder 102, and the piston 104 is slidably connected with the hydraulic cylinder 102, and the piston 104 is threadedly connected with the locking nut 105.

[0032] As shown in Figure 2 and Figure 3 , the hydraulic cylinder 102 is provided with an oil cavity 111 and a linkage cavity 109, the oil cavity 111 and the linkage cavity 109 are communicated, the diameter of the oil cavity 111 is larger than that of the linkage cavity 109, the oil cavity 111 is located above the linkage cavity 109, the hydraulic cylinder 102 is provided with a flow channel 110, the flow channel 110 comprises a horizontal section and a vertical section, the horizontal section of the flow channel 110 is connected with the interface 103, the vertical section of the flow channel 110 is communicated with the oil cavity 111, the horizontal section of the flow channel 110 and the vertical section of the flow channel 110 are communicated,

[0033] The lower end surface of the hydraulic cylinder 102 is a downwardly convex spherical surface.

[0034] As shown in Figure 2 and Figure 6 , the upper end surface of the base 101 is a downwardly concave spherical surface, the lower end surface of the hydraulic cylinder 102 corresponds to the shape of the upper end surface of the base 101 and is matched with the upper end surface of the base 101, the hydraulic cylinder 102 is movably arranged on the base 101, the middle part of the base 101 is provided with an upper and lower through hole 107, the diameter of the through hole 107 is larger than that of the bolt, and the through hole 107 is communicated with the linkage cavity 109.

[0035] As shown in Figure 2As shown in the drawings, the piston 104 comprises an upper part and a lower part, the diameter of the upper part is larger than that of the lower part, a connecting hole 106 is arranged in the middle of the piston 104 and penetrates the piston 104 from top to bottom, an inner thread is arranged on the hole wall of the connecting hole 106, the inner thread is used for connecting with a bolt, the diameter of the connecting hole 106 is equal to the diameter of the bolt, and an outer thread is arranged on the outer side of the upper part of the piston 104, the outer thread is used for connecting with a lock nut 105.

[0036] The lower part of the piston 104 is in sliding connection with the linkage cavity 109.

[0037] As shown in the drawings, the piston 104 comprises an upper part and a lower part, the diameter of the upper part is larger than that of the lower part, a connecting hole 106 is arranged in the middle of the piston 104 and penetrates the piston 104 from top to bottom, an inner thread is arranged on the hole wall of the connecting hole 106, the inner thread is used for connecting with a bolt, the diameter of the connecting hole 106 is equal to the diameter of the bolt, and an outer thread is arranged on the outer side of the upper part of the piston 104, the outer thread is used for connecting with a lock nut 105. Figure 2 Figure 4 As shown in the drawings, the piston 104 is provided with a sliding piece 115, the sliding piece 115 is in sliding connection with the inner wall of the oil cavity 111, the outer thread arranged on the piston 104 is located above the sliding piece 115, and a V-shaped spring energy storage ring 121 is arranged below the sliding piece 115.

[0038] The lower end surface of the upper part of the piston 104 is provided with an annular groove 120, and the annular groove 120 is in communication with the flow channel 110.

[0039] As shown in the drawings, the lock nut 105 is provided with six connecting holes 117 for connecting with a screwing tool. Figure 5

[0040] In the use of the hydraulic nut mounting bolt,

[0041] a. The hydraulic nut is connected with the bolt through the inner thread on the piston 104, the piston 104 in the hydraulic cylinder 102 is pushed by the ultra-high pressure oil, and the bolt subjected to the force is stretched in the elastic deformation zone of the bolt;

[0042] b. The lock nut 105 is screwed, so that the bolt is locked in the stretched position.

[0043] If the axis of the installed bolt is not perpendicular to the lower end surface of the hydraulic nut, the hydraulic cylinder 102 will move on the base 101, so that the axis of the piston 104 coincides with the axis of the bolt.

[0044] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the application concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.​​

Claims

1. A universal hydraulic nut, comprising a hydraulic cylinder, a piston and a locking nut, an oil cavity of the hydraulic cylinder is connected with an external pump station through a flow channel, the piston is located in the oil cavity of the hydraulic cylinder and is in sliding connection with the hydraulic cylinder, the piston is in ring structure and is provided with an inner thread and an outer thread, the piston is connected with a bolt through the inner thread, and the piston is connected with the locking nut through the outer thread, characterized in that, The hydraulic cylinder is movably arranged on the base.

2. The universal hydraulic nut of claim 1, wherein, The base is provided with a through hole, and the diameter of the through hole is larger than that of the bolt.

3. The universal hydraulic nut of claim 1, wherein, The hydraulic cylinder is provided with an oil cavity and a linkage cavity, the oil cavity is communicated with the linkage cavity, the oil cavity is above the linkage cavity, and the diameter of the oil cavity is larger than that of the linkage cavity.

4. The universal hydraulic nut of claim 1, wherein, The piston comprises an upper part and a lower part, the diameter of the upper part is larger than that of the lower part, the outer side of the upper part is provided with a sliding piece, the sliding piece is slidably connected with the inner wall of the oil cavity, the outer thread of the piston is arranged on the outer side of the upper part, the outer thread is above the sliding piece, and the lower part is slidably connected with the linkage cavity.

5. The universal hydraulic nut of claim 4, wherein, The middle part of the piston is provided with a connecting hole penetrating upward and downward, and the inner thread is arranged on the hole wall of the connecting hole.

6. The universal hydraulic nut of claim 1, wherein, The piston is provided with a groove, and the groove is communicated with the flow channel.

7. The universal hydraulic nut of claim 4, wherein, The lower side of the sliding piece is provided with a sealing piece, and the sealing piece is a V-shaped spring energy storage ring.

8. The universal hydraulic nut of claim 1, wherein, The locking nut is provided with a plurality of connecting holes for connecting the screwing tool.

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