Anti-loose hinge structure

Abstract

The utility model discloses an anti-loose hinge structure which comprises a supporting piece and a hinge body, a lug seat is arranged on the supporting piece, the end portion of the hinge body is connected with the lug seat through a bolt, a nut is screwed on the end portion of the bolt, and an anti-loose sleeve is sleeved on the outer side of the nut. And the risk that parts of the unit fall off due to vibration can be reduced, so that the maintenance cost and the downtime are reduced, the ultra-high water head giant impact type unit can be ensured to safely and stably operate in a severe environment, and the safety of personnel and equipment is ensured. The stability of the door body can be maintained, and the accurate position of the door in the opening and closing process can be ensured.

Description

Technical Field

[0001] This utility model relates to an anti-loosening hinge structure and belongs to the technical field of water turbine inlet valves. Background Technology

[0002] The ultra-high head giant impulse turbine unit has a safety access door inside the expansion joint of its inlet ball valve. This door, typically 600mm or 800mm in diameter, is normally closed and serves only as an access passage for maintenance of the impulse turbine and water supply system. Therefore, the door's location dictates that it must withstand the extremely high upstream pressure and the increased pressure within the expansion joint when the unit sheds its load. Compared to conventional hydropower stations, impulse turbines typically have 4, 6, or 8 nozzles in their distribution ring. During year-round operation, single-nozzle and multi-nozzle special operating modes are used as the flow rate changes to efficiently utilize the limited flow for power generation. Under normal operation, the water pressure P in the expansion joint is approximately equal to the upstream water supply system pressure. When switching operating modes, for the safety of the power plant equipment and personnel, the inlet valve on the flange side of the expansion joint is usually closed. When the inlet valve is fully closed, the water pressure P in the expansion joint drops to zero, and the amplitude of the ΔP change equals the value of P. When frequently switching operating modes, the telescopic pipe, safety access door assembly, and safety access door seat will be subjected to long-term alternating stress, posing a risk of fatigue failure. Therefore, the opening type of the access door and the reliability of its safety access door assembly and safety access door seat are directly related to the safety of the entire power plant. Once they fail, they can easily cause a major safety accident of flooding the power plant, and therefore have always been highly valued by power plants.

[0003] For the reasons mentioned above, loose hinges may lead to an unstable connection between the door and the frame. Under high water pressure, the door may deform or be damaged, and in severe cases, it may detach. High-pressure water may rapidly flood the surrounding area, threatening personnel safety and potentially causing equipment damage or facility malfunctions. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems by providing an anti-loosening hinge structure. This structure reduces the risk of components detaching due to vibration, thereby lowering maintenance costs and downtime. It ensures the safe and stable operation of ultra-high head giant impulse turbine units in harsh environments, thus protecting personnel and equipment safety. It also helps maintain the stability of the door, ensuring precise positioning during opening and closing.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A non-loosening hinge structure includes a support member and a hinge body. The support member is provided with an ear seat. The end of the hinge body is connected to the ear seat by a bolt. The end of the bolt is screwed with a nut. A non-loosening sleeve is fitted on the outside of the nut.

[0007] Alternatively, the inner shape of the locking sleeve corresponds to the outer shape of the nut.

[0008] Alternatively, the anti-loosening sleeve contacts the ear seat and is connected to the ear seat by spot welding.

[0009] Alternatively, both ends of the hinge body may be provided with a double-ear plate structure.

[0010] Alternatively, the movable end of the hinge body may have a bearing within its double-ear plate structure.

[0011] Alternatively, the bolt may include multiple segments of shaft diameter with progressively narrower dimensions.

[0012] Alternatively, the ear seat may include two ear seats arranged vertically; the end of the hinge body is also fixedly connected to a sleeve, which is fitted onto the hinge and positioned between the two ear seats.

[0013] Alternatively, a first bushing may be provided between the sleeve and the bolt; and a second bushing may be provided between the bolt and the lug.

[0014] Alternatively, a first thrust bearing may be provided between the first bushing and the second bushing; and a second thrust bearing may be provided between the nut and the second sleeve.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. The anti-loosening hinge structure provided by this utility model ensures a firm connection between the door body and the door frame. Even under long-term exposure to high water pressure and vibration, the door body can remain stable and is not prone to deformation or displacement.

[0017] 2. The anti-loosening hinge structure provided by this utility model features bolts with a gradient variation to facilitate assembly and disassembly; the bushings serve to lubricate rotation and prevent rust, ensuring flexible rotation and convenient disassembly; the anti-loosening sleeve at the bottom of the bolt utilizes a small-clearance fit between the hexagonal nut and the anti-loosening limiting sleeve, reinforced with spot welding on the outer side to ensure safe operation of the power station; each bushing contact point is equipped with a thrust copper bearing to prevent axial movement, jamming, and rusting of the bushing. The outer hinge and the access door are equipped with crank-shaped bearings and measures are taken to prevent axial movement and circumferential rotation, making the hinge and the access door form a rigid body. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the usage state of this utility model.

[0019] Figure 2 This is a structural diagram of the bolt area.

[0020] The markings in the diagram are: 1-support component, 2-entry door body, 3-hinge body, 4-double ear plate structure, 5-ear seat, 6-bolt, 7-nut, 8-anti-loosening sleeve, 9-sleeve, 10-first bushing, 11-second bushing, 12-first thrust bearing, 13-second thrust bearing. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] A type of anti-loosening hinge structure, such as Figure 1-2 As shown, it includes a support member 1 and a hinge body 3. The support member 1 is provided with an ear seat 5. The end of the hinge body 3 is connected to the ear seat 5 by a bolt 6. The end of the bolt 6 is screwed with a nut 7. The outer side of the nut 7 is fitted with an anti-loosening sleeve 8.

[0024] Specifically, the support member 1 is fixed to the telescopic tube or the component where the entrance door 2 is located, providing support and fixing points for the hinge body 3. Further, in this design, the support member 1 can be an entrance door seat. The hinge body 3 is the key part connecting the support member 1 and the entrance door 2, driving the entrance door 2 to rotate within a certain range to achieve the opening and closing of the entrance door 2. In this design, the hinge body 3 is a curved rod to avoid the entrance door seat during rotation, obtaining a larger range of rotation. The lug 5 is a part of the support member 1, used to connect to the end of the hinge body 3. It has one or more holes for the bolt 6 to pass through. The bolt 6 is used to connect the end of the hinge body 3 to the lug 5 and acts as a pivot. The nut 7 is used to fix the bolt 6, preventing it from moving or falling out of the lug 5. The anti-loosening sleeve 8 can effectively prevent the nut 7 from loosening due to vibration, temperature changes, or long-term use. Due to the presence of the anti-loosening sleeve 8, this hinge structure can maintain the tightness of its connection during long-term use, thereby increasing the overall durability of the structure.

[0025] In another specific embodiment, the inner shape of the anti-loosening sleeve 8 corresponds to the outer shape of the nut 7. When the nut 7 is tightened, the inner shape of the anti-loosening sleeve 8 fits tightly with the outer shape of the nut 7, forming a locking effect, which can effectively prevent the nut 7 from loosening due to vibration or torque.

[0026] In another specific implementation, the anti-loosening sleeve 8 contacts the ear seat 5 and is connected to the ear seat 5 by spot welding. The spot welding of the anti-loosening sleeve 8 to the ear seat 5 forms a robust locking mechanism. This ensures that the anti-loosening sleeve 8 will not loosen during normal use, thus providing a long-term guarantee of fastening. Although spot welding provides permanent fixation, the locking can be released by removing the weld when maintenance or hinge replacement is required. This effectively balances the reliability of the connection with the ease of disassembly.

[0027] In another specific embodiment, both ends of the hinge body 3 are provided with double ear plate structures 4. The double ear plate structure 4 provides two connection points, which, compared to a single ear plate structure, can more evenly distribute and bear the force from the entrance door 2, thereby improving the stability and reliability of the connection and enabling it to withstand greater loads. This helps reduce possible displacement of the entrance door 2 during use, maintaining its alignment and balance. Specifically, one end of the hinge body 3 is provided with two symmetrical ear plates, each ear plate having bolt holes 6 for connection to the ear seat 5 on the support member 1.

[0028] In another specific embodiment, a bearing is provided inside the double-ear plate structure 4 at the movable end of the hinge body. Since the movable end of the hinge body needs to be connected to the entrance door 2, the bearing can prevent axial movement between the connecting pin and the double-ear plate structure 4.

[0029] In another specific embodiment, the bolt 6 comprises multiple segments of shaft diameter that taper sequentially. During disassembly, one can begin from the side with the larger shaft diameter, as this provides a larger contact area, making it easier for disassembly tools to apply torque and to grip and rotate the bolt 6. Furthermore, since the diameter of the bolt 6 decreases at the ends, the corresponding nut 7 can be designed to be smaller, thus reducing the space occupied by the nut 7 in the installation location.

[0030] In another specific embodiment, the ear seat 5 includes two arranged vertically; the end of the hinge body 3 is also fixedly connected to a sleeve 9, which is sleeved on the hinge and located between the two ear seats 5. The sleeve 9 increases lateral support, further enhances the stability of the hinge, and ensures the stability of the hinge in the vertical direction. It can also precisely align the hinge body 3, reducing gaps and unnecessary wear.

[0031] In another specific embodiment, a first bushing 10 is provided between the sleeve 9 and the bolt 6; a second bushing 11 is provided between the bolt 6 and the lug 5. This serves to prevent rust and also withstand sliding, reducing friction and thus lowering energy loss. Furthermore, since the bolt 6 has multiple segments, the bushings also have multiple diameters matching those of the bolt 6.

[0032] In another specific embodiment, a first thrust bearing 12 is provided between the first bushing 10 and the second bushing 11; a second thrust bearing 13 is provided between the nut 7 and the second sleeve 9. This facilitates assembly and disassembly while preventing the bushings from jamming.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. The present utility model extends to any new features or combinations disclosed in this specification, and any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model. It is obvious to those skilled in the art that the present utility model is not limited to the details of the above exemplary embodiments, and that detailed technical features not disclosed in this embodiment, such as specific structures and connection methods, can be obtained by those skilled in the art from the prior art; the present disclosure does not specifically limit these aspects.

Claims

1. A non-loosening hinge structure, characterized in that: It includes a support member (1) and a hinge body (3). The support member (1) is provided with an ear seat (5). The end of the hinge body (3) is connected to the ear seat (5) by a bolt (6). The end of the bolt (6) is screwed with a nut (7). The outer side of the nut (7) is fitted with an anti-loosening sleeve (8).

2. The anti-loosening hinge structure as described in claim 1, characterized in that: The inside of the anti-loosening sleeve (8) corresponds to the shape of the outside of the nut (7).

3. The anti-loosening hinge structure as described in claim 1, characterized in that: The anti-loosening sleeve (8) contacts the ear seat (5) and is connected to the ear seat (5) by spot welding.

4. The anti-loosening hinge structure as described in claim 1, characterized in that: Both ends of the hinge body (3) are provided with double ear plate structures (4).

5. The anti-loosening hinge structure as described in claim 4, characterized in that: The hinge body (3) has a bearing inside the double ear plate structure (4) at the movable end.

6. The anti-loosening hinge structure as described in claim 1, characterized in that: The bolt (6) comprises multiple shaft diameters with progressively narrower dimensions.

7. The anti-loosening hinge structure as described in claim 1, characterized in that: The ear seat (5) includes two arranged vertically; the end of the hinge body (3) is also fixedly connected to a sleeve (9), which is sleeved on the hinge and located between the two ear seats (5).

8. The anti-loosening hinge structure as described in claim 7, characterized in that: A first bushing (10) is provided between the sleeve (9) and the bolt (6); a second bushing (11) is provided between the bolt (6) and the lug (5).

9. The anti-loosening hinge structure as described in claim 8, characterized in that: A first thrust bearing (12) is provided between the first bushing (10) and the second bushing (11); a second thrust bearing (13) is provided between the nut (7) and the second bushing (11).

Images