Double-acting integrated hydraulic nut and hydraulic nut system

Abstract

The utility model discloses a double-acting integrated hydraulic nut and a hydraulic nut system. The double-acting integrated hydraulic nut comprises a cylinder body, a piston, a cylinder cover, a locking nut, an outer hexagon head bolt and a locking sleeve. A mounting plane attached to a workpiece is arranged at the bottom of the cylinder body, and the piston is arranged in an inner cavity of the cylinder body in an axial sliding mode. The outer hexagonal head bolt sequentially penetrates through the axial through hole of the piston and the bottom of the cylinder body, and the threaded end of the outer hexagonal head bolt is meshed with a workpiece in a threaded mode. The cylinder cover is arranged at the top of the cylinder body; the locking nut is in threaded connection with the piston rod and is in contact with the top surface of the cylinder cover; a pressurizing oil port connected with a hydraulic pump station is formed in the side wall of the cylinder body. The hexagonal head of the outer hexagonal head bolt is sleeved with the locking sleeve which is in driving connection with the electric wrench. According to the utility model, as the bearing seat bolts are compact in layout and the requirement on pretightening force of the bolts is high, the experiment platform can be quickly assembled and disassembled, and the working time and cost are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic nut technology, specifically to a double-acting integrated hydraulic nut and hydraulic nut system. Background Technology

[0002] Currently, most large wind turbine bearing housing loading test platforms use single-cylinder hydraulic nuts for bolt tightening. However, this method has significant drawbacks under conditions of high preload and compact layout. The single-cylinder structure has insufficient output to meet high preload requirements, and the need for multiple additional cylinders leads to bulky equipment and large space occupation. Disassembly and assembly require repeated adjustments to the cylinder positions, making the operation cumbersome and time-consuming. Furthermore, traditional hydraulic nuts rely on manual tightening of the locking nuts, resulting in inconsistent preload and a tendency for bolt loosening or overload failures, affecting experimental accuracy and equipment reliability.

[0003] In existing technologies, hydraulic nuts generally adopt a split design, with the cylinder and locking mechanism separate, resulting in a loose overall structure that cannot adapt to scenarios with densely packed bolt holes in wind turbine bearing housings. During frequent disassembly and assembly experiments, traditional hydraulic systems lack sufficient pressure control precision, making it difficult to achieve accurate axial force control and leading to high maintenance costs. To address these issues, there is an urgent need for a highly integrated, high-output, and easily precisely controlled hydraulic nut to meet the dual requirements of efficient disassembly and assembly and high preload loading in compact layouts. Utility Model Content

[0004] In view of the above-mentioned technical problems in related technologies, this utility model proposes a double-acting integrated hydraulic nut and hydraulic nut system, which can overcome the above-mentioned shortcomings of the prior art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows:

[0006] Firstly, this utility model provides a dual-acting integrated hydraulic nut;

[0007] This double-acting integrated hydraulic nut includes a cylinder body, piston, cylinder head, locking nut, external hexagonal head bolt, and locking sleeve. The bottom of the cylinder body has an mounting surface that fits against the workpiece, and the piston is axially slidably disposed in the inner cavity of the cylinder body. The external hexagonal head bolt passes through the axial through hole of the piston and the bottom of the cylinder body in sequence, and the threaded end of the external hexagonal head bolt engages with the thread of the workpiece. The cylinder head is disposed on the top of the cylinder body, and the locking nut is threadedly connected to the rod of the piston and contacts the top surface of the cylinder head. The side wall of the cylinder body has a pressurized oil port connected to a double-acting tensile hydraulic pump station, and the locking sleeve is fitted onto the hexagonal head of the external hexagonal head bolt and is driven by an electric wrench.

[0008] Furthermore, an axial positioning structure is provided between the locking sleeve and the bottom surface of the cylinder body, and the inner hole of the locking sleeve is provided with a hexagonal cavity that forms an anti-rotation fit with the head of the external hexagonal head bolt.

[0009] Furthermore, a seal is provided between the piston and the cylinder, and the seal is disposed between the outer peripheral wall of the piston and the inner wall of the cylinder.

[0010] Furthermore, the pressurization port of the cylinder is connected to a double-acting tensile hydraulic pump station via a quick-connect coupling. The pressure control system of the double-acting tensile hydraulic pump station includes a proportional relief valve and a digital pressure sensor.

[0011] Furthermore, the inner hole of the locking sleeve is provided with a hexagonal cavity that cooperates with the anti-rotation mechanism of the bolt head, and an axial positioning structure is provided between the locking sleeve and the bottom surface of the cylinder body.

[0012] Furthermore, the inner contour of the locking sleeve matches the outer hexagonal contour of the locking nut, and the electric wrench transmits torque to the locking nut by driving the locking sleeve to rotate.

[0013] Furthermore, the piston working area of ​​the cylinder is 7000-7100mm², the maximum working pressure of the hydraulic system is 200MPa, and the effective stroke of the piston is 15-25mm.

[0014] Secondly, this utility model provides a hydraulic nut system;

[0015] The hydraulic nut system includes the aforementioned double-acting integrated hydraulic nut and double-acting tension hydraulic pump station. The hydraulic pump station is connected to the pressurization port of the cylinder via a quick-connect coupling. The pressure control system of the hydraulic pump station includes a proportional relief valve and a digital display pressure sensor. The hydraulic pump station is configured to supply oil to the hydraulic oil chamber in both directions to control the extension and retraction of the piston.

[0016] Furthermore, the double-acting tension hydraulic pump station includes an electro-hydraulic proportional directional valve and a high-pressure accumulator; the electro-hydraulic proportional directional valve is linked with the proportional relief valve to achieve stepless adjustment of the piston extension / retraction speed; the high-pressure accumulator is connected to the pump station's oil outlet pipeline to stabilize system pressure fluctuations.

[0017] Furthermore, the hydraulic pump station's oil circuit system adopts a parallel dual oil circuit design, wherein the first oil circuit is connected to the pressurized oil chamber to control the piston extension, and the second oil circuit is connected to the retraction oil chamber to control the piston retraction; both oil circuits are equipped with independent pressure sensors and safety pressure relief valves.

[0018] The beneficial effects of this utility model are as follows: Through the structural optimization and improvement design of the double-acting integrated hydraulic nut, the integrated cylinder body and double-acting oil chamber layout effectively reduce the axial installation space, break through the bottleneck of traditional single oil cylinder output, and achieve precise control of preload; the synchronous displacement mechanism of piston linkage tensioning bolt combined with linear control of hydraulic pressure ensures the consistency of axial loading force and reduces the risk of equipment eccentricity; the quick disassembly and assembly of locking sleeve and electric wrench further improve the disassembly and assembly efficiency of experimental platform bolt group, and significantly reduce overall working time and cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view of the overall structure of a dual-acting integrated hydraulic nut according to an embodiment of the present utility model;

[0021] Figure 2 This is a top view of the overall structure of a dual-acting integrated hydraulic nut according to an embodiment of the present utility model;

[0022] Figure 3 This is a high-pressure oil inlet locking principle diagram of a double-acting integrated hydraulic nut according to an embodiment of the present utility model;

[0023] Figure 4 This is a diagram illustrating the locking principle of an electric wrench for locking a dual-acting integrated hydraulic nut according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram illustrating the high-pressure oil inlet state loosening principle of a dual-acting integrated hydraulic nut according to an embodiment of this utility model.

[0025] Figure 6 This is a schematic diagram illustrating the loosening principle of an electric wrench for a dual-acting integrated hydraulic nut according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram illustrating the piston reset state loosening principle of a dual-acting integrated hydraulic nut according to an embodiment of this utility model.

[0027] Figure 8 This is a schematic diagram of the installation of a double-acting integrated hydraulic nut applied to a fan bearing housing according to an embodiment of the present utility model;

[0028] In the diagram: 1. Cylinder block; 2. Piston; 3. Cylinder head; 4. Locking nut; 5. External hex head bolt; 6. Locking sleeve; 7. Electric wrench. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0030] It should be understood that in the description of the embodiments of this utility model, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0031] like Figure 1-6 As shown in the embodiment of this utility model, a double-acting integrated hydraulic nut includes a cylinder body 1, a piston 2, a cylinder head 3, a locking nut 4, an external hexagonal head bolt 5, and a locking sleeve 6. The bottom of the cylinder body 1 is provided with an installation plane that fits against the workpiece. The piston 2 is axially slidably disposed in the inner cavity of the cylinder body 1. The external hexagonal head bolt 5 passes through the axial through hole of the piston 2 and the bottom of the cylinder body 1 in sequence, and the threaded end of the external hexagonal head bolt 5 engages with the thread of the workpiece. The cylinder head 3 is disposed on the top of the cylinder body 1. The locking nut 4 is threadedly connected to the rod of the piston 2 and contacts the top surface of the cylinder head 3. The side wall of the cylinder body 1 is provided with a pressurized oil port connected to a double-acting tensile hydraulic pump station. The locking sleeve 6 is sleeved on the hexagonal head of the external hexagonal head bolt 5 and drivenly connected to an electric wrench 7.

[0032] According to an embodiment of the present invention, a double-acting integrated hydraulic nut is provided, in a specific embodiment, an axial positioning structure is provided between the locking sleeve 6 and the bottom surface of the cylinder body 1, and the inner hole of the locking sleeve 6 is provided with a hexagonal cavity that forms an anti-rotation fit with the head of the external hexagonal head bolt 5.

[0033] According to an embodiment of the present invention, a double-acting integrated hydraulic nut is provided between the piston 2 and the cylinder 1 in a specific embodiment. The sealing element is disposed between the outer peripheral wall of the piston 2 and the inner wall of the cylinder 1.

[0034] According to an embodiment of the present invention, in a specific embodiment of a double-acting integrated hydraulic nut, the pressurization port of the cylinder 1 is connected to a double-acting tensile hydraulic pump station via a quick-connect coupling. The pressure control system of the double-acting tensile hydraulic pump station includes a proportional relief valve and a digital display pressure sensor.

[0035] According to an embodiment of the present invention, a double-acting integrated hydraulic nut is provided. In a specific embodiment, the inner hole of the locking sleeve 6 is provided with a hexagonal cavity that cooperates with the anti-rotation of the bolt head, and an axial positioning structure is provided between the locking sleeve 6 and the bottom surface of the cylinder 1.

[0036] According to an embodiment of the present invention, in a specific embodiment of a dual-acting integrated hydraulic nut, the inner contour of the locking sleeve 6 matches the outer hexagonal contour of the locking nut 4, and the electric wrench 7 transmits torque to the locking nut 4 by driving the locking sleeve 6 to rotate.

[0037] According to an embodiment of the present invention, in a specific embodiment of a double-acting integrated hydraulic nut, the piston working area of ​​the cylinder 1 is 7000-7100mm², the maximum working pressure of the hydraulic system is 200MPa, and the effective stroke of the piston 2 is 15-25mm.

[0038] In addition, such as Figure 7 As shown, the hydraulic nut system of this utility model includes the above-mentioned double-acting integrated hydraulic nut and double-acting tension hydraulic pump station. The hydraulic pump station is connected to the pressurization port of the cylinder 1 through a quick-connect coupling. The pressure control system of the hydraulic pump station includes a proportional relief valve and a digital display pressure sensor. The hydraulic pump station is configured to supply oil to the hydraulic oil chamber in both directions to control the extension and retraction of the piston 2.

[0039] According to an embodiment of the present invention, a hydraulic nut system is provided. In a specific embodiment, the double-acting tension hydraulic pump station includes an electro-hydraulic proportional directional valve and a high-pressure accumulator. The electro-hydraulic proportional directional valve is linked with the proportional relief valve to achieve stepless adjustment of the piston 2 extension / retraction speed. The high-pressure accumulator is connected to the pump station's oil outlet pipeline to stabilize system pressure fluctuations.

[0040] According to an embodiment of the present invention, a hydraulic nut system is provided. In a specific embodiment, the hydraulic pump station's oil circuit system adopts a parallel dual oil circuit design, wherein the first oil circuit is connected to the pressurized oil chamber to control the piston 2 to extend, and the second oil circuit is connected to the retraction oil chamber to control the piston 2 to retract; both oil circuits are equipped with independent pressure sensors and safety relief valves.

[0041] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.

[0042] According to the present invention, a double-acting integrated hydraulic nut is provided. The hydraulic cylinder consists of a cylinder body 1, a piston 2, a cylinder head 3, a seal, and a locking nut 4. The bottom surface of the cylinder is in contact with the workpiece. The external hexagonal head bolt 5 passes through the piston 2 and engages with the workpiece thread. The external hexagonal head bolt 5 can move synchronously with the piston 2. After hydraulic oil is added through the filling port, the piston 2 and the external hexagonal head bolt 5 are forced to move outward and upward, while pressing the workpiece. When the tension reaches the required level, the locking nut 4 is locked to release the pressure.

[0043] The compatible double-acting tension hydraulic pump station, with its mature technology system, ensures stable system operation and is not prone to failure. It can be quickly disassembled and installed. Moreover, thanks to its simple design and mature technology, daily maintenance does not require complicated procedures and is easy to learn.

[0044] The specific implementation method of this utility model is as follows:

[0045] 1. Position the bottom of the hydraulic cylinder at the location of the bearing seat bolt hole.

[0046] 2. Select a hexagonal head bolt 5 as the tensioning screw, pass it through the inner hole of piston 2, align it with the threaded hole of the workpiece, and tighten it.

[0047] 3. After tightening all tension screws, do not connect the oil pipes yet, and set the tension pump station pressure value.

[0048] 4. After completing the preparations, connect the hydraulic pump station to the integrated tooling using oil pipes to perform the stretching operation.

[0049] 5. When hydraulic oil from the pump station is injected into the hydraulic cylinder, piston 2 pushes the tension screw outward under the action of the hydraulic oil, and the workpiece is pressed by pressure.

[0050] 6. When the required tension is reached, use the electric wrench 7 to lock the locking nut 4 to release the pressure.

[0051] Specifically, in actual use, first align the mounting plane at the bottom of the hydraulic nut cylinder with the bearing seat bolt hole, select an external hexagonal head bolt and pass it through the axial through hole of the piston and the bottom of the cylinder in sequence, screw it into the workpiece thread hole and tighten it initially.

[0052] The double-acting tensile hydraulic pump station is then connected to the pressurization port on the cylinder sidewall via a quick-connect coupling. The target value of the pump station pressure control system is set (precisely controlled by a proportional relief valve and a digital pressure sensor). After starting the pump station, hydraulic oil is injected into the pressurization chamber through the first oil circuit, pushing the piston to slide axially upwards along the inner cavity of the cylinder. Simultaneously, the external hexagonal head bolt passing through the cylinder moves outwards, generating axial tensile force on the bolt and clamping the workpiece. When the digital pressure sensor detects that the preload has reached the set value, the operator immediately activates the electric wrench. This wrench drives the locking sleeve fitted on the hexagonal head of the bolt to rotate. The inner contour of the sleeve engages with the outer hexagonal contour of the locking nut, thereby transmitting torque to the locking nut and tightening it against the piston top surface. Finally, the oil pressure is released to complete the installation.

[0053] During disassembly, the pump station supplies oil to the retraction oil chamber through the second oil circuit to drive the piston downward to reset. At the same time, the preload can be released by loosening the locking nut with an electric wrench.

[0054] Its working principle lies in the combination of double-acting hydraulic linkage and mechanical locking. The hydraulic system achieves bidirectional control through a parallel dual-oil circuit design: when oil enters the pressurized oil circuit, the piston overcomes the bolt resistance and moves upward under the action of hydraulic thrust (maximum 200MPa pressure acting on a 7000-7100mm² piston area), precisely stretching the bolt to generate a preset axial preload; at this time, the locking sleeve and the hexagonal cavity of the bolt head anti-rotation fit ensure that the bolt does not rotate, while the seal between the piston and the cylinder maintains oil pressure sealing. After the preload is established, the electric wrench achieves mechanized and rapid tightening of the locking nut through the contour matching of the sleeve and the nut, converting the tensile displacement into mechanical locking force. When oil enters the retraction oil circuit, it drives the piston to move in the opposite direction to reset. In the pump station, the electro-hydraulic proportional directional valve and the proportional relief valve are linked to achieve stepless adjustment of the piston speed, the high-pressure accumulator suppresses pressure fluctuations, and the dual-oil circuit independent safety relief valve ensures system safety, ultimately achieving integrated control of high preload precise loading and efficient disassembly and assembly.

[0055] In summary, by utilizing the above-mentioned technical solution of this utility model, through the structural optimization and improvement design of the double-acting integrated hydraulic nut, and by adopting an integrated cylinder body and double-acting oil chamber layout, the axial installation space is effectively reduced, breaking through the bottleneck of traditional single-cylinder output and achieving precise control of preload; the synchronous displacement mechanism of the piston linkage tensioning bolt combined with the linear control of hydraulic pressure ensures the consistency of axial loading force and reduces the risk of equipment off-center loading; the quick disassembly and assembly of the locking sleeve and the electric wrench further improves the disassembly and assembly efficiency of the experimental platform bolt group, and significantly reduces the overall working time and cost.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-acting integrated hydraulic nut, characterized by, The cylinder includes a cylinder body (1), a piston (2), a cylinder head (3), a locking nut (4), an external hexagonal head bolt (5), and a locking sleeve (6). The bottom of the cylinder body (1) is provided with an installation plane that fits against the workpiece. The piston (2) is axially slidably disposed in the inner cavity of the cylinder body (1). The external hexagonal head bolt (5) passes through the axial through hole of the piston (2) and the bottom of the cylinder body (1) in sequence. The threaded end of the external hexagonal head bolt (5) is threaded with the workpiece. The cylinder head (3) is disposed on the top of the cylinder body (1). The locking nut (4) is threadedly connected to the rod of the piston (2) and contacts the top surface of the cylinder head (3). The side wall of the cylinder body (1) is provided with a pressurized oil port connected to a double-acting tensile hydraulic pump station. The locking sleeve (6) is sleeved on the hexagonal head of the external hexagonal head bolt (5) and driven by an electric wrench (7).

2. A dual acting integrated hydraulic nut according to claim 1, wherein, An axial positioning structure is provided between the locking sleeve (6) and the bottom surface of the cylinder (1), and the inner hole of the locking sleeve (6) is provided with a hexagonal cavity that forms an anti-rotation fit with the head of the external hexagonal head bolt (5).

3. A dual acting integrated hydraulic nut according to claim 1, wherein, A seal is provided between the piston (2) and the cylinder (1), and the seal is disposed between the outer peripheral wall of the piston (2) and the inner wall of the cylinder (1).

4. A dual acting integrated hydraulic nut according to claim 1, wherein, The pressurized oil port of the cylinder (1) is connected to the double-acting tensile hydraulic pump station through a quick-connect coupling. The pressure control system of the double-acting tensile hydraulic pump station includes a proportional relief valve and a digital display pressure sensor.

5. A dual acting integrated hydraulic nut as claimed in claim 1, wherein, The inner hole of the locking sleeve (6) is provided with a hexagonal cavity that cooperates with the anti-rotation of the bolt head, and an axial positioning structure is provided between the locking sleeve (6) and the bottom surface of the cylinder (1).

6. A dual acting integrated hydraulic nut as claimed in claim 1, wherein, The inner contour of the locking sleeve (6) matches the outer hexagonal contour of the locking nut (4), and the electric wrench (7) transmits torque to the locking nut (4) by driving the locking sleeve (6) to rotate.

7. A dual acting integrated hydraulic nut as claimed in claim 1, wherein, The piston working area of ​​the cylinder (1) is 7000-7100mm², the maximum working pressure of the hydraulic system is 200MPa, and the effective stroke of the piston (2) is 15-25mm.

8. A hydraulic nut system characterized in that, The invention includes the double-acting integrated hydraulic nut and double-acting tension hydraulic pump station as described in any one of claims 1-7, wherein the hydraulic pump station is connected to the pressurized oil port of the cylinder (1) via a quick-connect coupling; the pressure control system of the hydraulic pump station includes a proportional relief valve and a digital display pressure sensor; the hydraulic pump station is configured to supply oil to the hydraulic oil chamber in both directions to control the extension and retraction of the piston (2).

9. A hydraulic nut system according to claim 8, wherein, The double-acting stretching hydraulic pump station includes an electro-hydraulic proportional directional valve and a high-pressure accumulator; the electro-hydraulic proportional directional valve is linked with the proportional relief valve to achieve stepless adjustment of the piston (2) extension / retraction speed; the high-pressure accumulator is connected to the pump station's oil outlet pipeline to stabilize system pressure fluctuations.

10. A hydraulic nut system according to claim 8 or 9, characterized in that The hydraulic pump station's oil circuit system adopts a parallel dual oil circuit design, wherein the first oil circuit connects to the pressurized oil chamber to control the piston (2) to extend, and the second oil circuit connects to the retraction oil chamber to control the piston (2) to retract; both oil circuits are equipped with independent pressure sensors and safety relief valves.

Images