A tail water access door shaft anti-drop device

Abstract

The utility model relates to the technical field of water and electricity station valve anti -drop fastening device discloses a tail water maintenance door shaft anti -drop device, including the force link, and with the cam screw of force link both ends connection, the cam screw top surface covers the elastic gasket, and the cam screw periphery inserts a plurality of clamping pins for fixing the elastic gasket. The device passes through the force link rotation force link to drive both sides cam screw conversion synchronous reverse axial telescopic movement, make the elastic gasket resist to the door shaft on outside. The gasket of the device provides the sustained elasticity, the self -adaptation compensation tiny displacement or vibration sustainedly resist the door shaft, and its applied constraint force can reliably maintain to the door shaft, can prevent its from leaving the predetermined position, ensures the safe operation.

Description

Technical Field

[0001] This utility model relates to the technical field of valve anti-detachment fastening devices for hydropower stations, and in particular to an anti-detachment device for tailrace maintenance gate shafts. Background Technology

[0002] Tailwater maintenance doors are typically opened and closed via a hinged connection to a support. During vertical lifting, the hinges are prone to loosening and frequent slippage. Current anti-loosening methods, such as adding spring washers or double nuts, have limited effectiveness under existing operating conditions, still requiring frequent tightening by maintenance personnel, increasing workload. Therefore, there is an urgent need for a door hinge anti-loosening device that can automatically compensate for vibration and wear, reliably prevent loosening, and is easy to operate. Utility Model Content

[0003] The purpose of this utility model is to provide a tailwater maintenance gate shaft anti-detachment device to address the above-mentioned problems.

[0004] This utility model is achieved through the following solution: A tailrace maintenance gate shaft anti-detachment device includes a support rod, a through hole in the middle of the rod body, and internal threads with opposite directions at both ends of the support rod; Two cam screws are respectively connected to both ends of the load-bearing rod; each cam screw includes an integral bearing boss and a screw section extending from the bearing boss, and the screw section is respectively engaged with the internal thread; The force-applying rod is inserted into the through hole of the load-bearing rod during use to drive the load-bearing rod to rotate around its own central axis. Elastic gaskets are installed on the end face of the bearing boss to adaptively compensate for displacement or vibration; A circumferential locking assembly is distributed circumferentially along the bearing boss and fixes the elastic gasket to the end face of the bearing boss; In this process, the force-bearing rod is rotated by the force-applying rod, thereby driving the cam screws on both sides to convert into synchronous reverse axial extension and retraction motion, so that the elastic pad is pressed against the external door hinge.

[0005] Furthermore, the end face of the pressure-bearing boss is provided with a recessed receiving cavity.

[0006] Furthermore, the elastic gasket is at least partially housed within the receiving cavity opened on the end face of the pressure-bearing boss, and protrudes beyond the end face of the pressure-bearing boss.

[0007] Furthermore, the base of the elastic gasket is locked within the receiving cavity by a circumferential locking assembly to prevent the elastic gasket from loosening.

[0008] Furthermore, the resilient gasket includes a positioning flange and an end face gasket.

[0009] Furthermore, the positioning flange is fitted into the receiving cavity; the end face gasket extends outward from the positioning flange and covers the end face of the pressure-bearing boss for contact with the outside.

[0010] Furthermore, the circumferential locking assembly includes multiple locking pins, each pin including a top plate and a fastening screw. The pressure-bearing boss is provided with a screw hole in the circumferential direction, and the fastening screw passes through the screw hole and presses to fix the elastic gasket.

[0011] Furthermore, there are four locking pins, which are arranged in four directions relative to the plane of the bearing boss.

[0012] Furthermore, the internal thread includes a first internal thread and a second internal thread with the opposite direction of rotation to the first internal thread; the cam screw includes a first cam screw and a second cam screw, the first screw section of the first cam screw is provided with an external thread that matches the first internal thread; the second screw section of the second cam screw is provided with an external thread that matches the second internal thread.

[0013] Furthermore, it includes a pre-tensioning band, which tensions the first cam screw and the second cam screw together, i.e., both ends are tightly attached to the pins at both ends of the load-bearing rod, and is used to apply pre-tensioning force to the load-bearing rod to prevent loosening.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The rotating rod can drive the two cam screws to move synchronously in opposite directions or in opposite directions, which is simple to operate and easy to install and adjust.

[0015] 2. The elastic rubber gasket provides continuous elasticity, adaptively compensating for minor displacements and vibrations during the opening and closing of the tailrace maintenance gate, and always maintaining effective constraint on the gate hinge. 3. The locking pins secure the elastic washers to the belt to prevent the threads from loosening, forming a double locking mechanism. Attached image description: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the load-bearing rod of this utility model; Figure 3 This is a schematic diagram of the cam screw of this utility model; Figure 4 This is a schematic diagram of the elastic gasket of this utility model; Figure 5 This is a schematic diagram of the locking pin of this utility model; Figure 6 This is a schematic diagram of the pretensioner belt loading of this utility model; Figure 7 This is a schematic diagram of the installation state of this utility model.

[0016] Figure label: 1-Bearing rod; 11-Through hole; 2-Force application rod; 21-First internal thread; 22-Second internal thread; 3-Cam screw; 31-Pressure-bearing boss; 32-Screw section; 33-Accommodation cavity; 301-First cam screw; 302-Second cam screw; 34-Screw hole; 4-Elastic washer; 41-Positioning flange; 42-End face washer; 5-Snap pin; 51-Fasting screw; 52-Top plate; 6-Pre-tension band. Detailed Implementation

[0017] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0018] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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 this utility model.

[0020] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0021] like Figure 1 As shown, a tailwater maintenance gate shaft anti-detachment device is provided, including a support rod 1 and cam screws 3 connected to both ends of the support rod 1; the support rod 1 has a through hole 11 in the middle of the rod body, and the two ends of the rod body are respectively provided with internal threads with opposite directions of rotation, and the parts of the cam screws 3 at both ends that are connected to the support rod 1 are respectively provided with external threads corresponding to the internal threads, the top surface of the cam screw 3 is covered with an elastic washer 4, and multiple locking pins 5 are inserted circumferentially into the cam screw 3 for fixing the elastic washer 4.

[0022] In use, the force-applying rod 2 is inserted into the through hole 11 in the vertical direction relative to the load-bearing rod 1, which can drive the load-bearing rod 1 to rotate around its own central axis, and the axes of the cam screws 3 at both ends extend outward or retract inward.

[0023] Due to the above structure, the load-bearing rod 1 is rotated and installed by the force-applying rod 2. During installation, the cam screws 3 on both sides first abut against the outer door shaft. At this time, the cam screws 3 cannot rotate radially due to external friction. Thus, the cam screws 3 can be converted into synchronous and opposite axial extension and retraction motion, which can eventually make the elastic pad 4 abut against the outer door shaft. like Figure 2 As shown, specifically, the support rod 1 is a double-headed irregular threaded support rod 1, with a first internal thread 21 and a second internal thread 22 with opposite directions of rotation at both ends of the rod body. Preferably, the first internal thread 21 is a left-handed internal thread and the second internal thread 22 is a right-handed internal thread. The screw section 32 of the first cam screw 301 is provided with a first external thread that matches the first internal thread 21. The screw section 32 of the second cam screw 302 is provided with a second external thread that matches the second internal thread 22. The first cam screw 301 and the second cam screw 302 are respectively connected to the two ends of the double-headed irregular threaded support rod 1 through external threads. Since the first telescopic screw and the second telescopic screw are restricted from rotating by the frictional force of contact with the door hinge, when the support rod 1 rotates in the forward direction, the first and second telescopic screws can extend outward synchronously. When the support rod 1 rotates in the reverse direction, the first and second telescopic screws retract inward synchronously.

[0024] like Figure 3 As shown, the cam screw 3 includes an integral bearing boss 31 and a screw section 32 extending from the bearing boss 31. The screw section 32 is engaged with the internal thread of the bearing rod 1. The end face of the bearing boss 31 is provided with a concave accommodating cavity 33. The bearing boss 31 is provided with a screw hole 34 in the circumferential direction. The screw hole 34 is oriented from the outside to the inside of the accommodating cavity 33. like Figure 4 As shown, the elastic gasket 4 includes a positioning flange 41 and an end face gasket 42. The positioning flange 41 is embedded in the receiving cavity 33. The end face gasket 42 extends outward from the positioning flange 41 and covers the end face of the pressure-bearing boss 31. In the compressed state, it fits tightly against the external door hinge surface to adaptively compensate for displacement or vibration. like Figure 5 As shown, the pressure-bearing boss 31 is circumferentially connected with multiple locking pins 5. Each locking pin 5 includes a top plate 52 and a fastening screw 51. The fastening screw 51 passes through the screw hole 34 on the pressure-bearing boss 31 and enters the receiving cavity 33. After the locking pin 5 is tightened, the head of the fastening screw 51 protrudes out of the receiving cavity 33. In this way, the positioning flange 41 is locked in the receiving cavity 33 by the locking pin 5 to prevent the elastic gasket 4 from loosening.

[0025] like Figure 6As shown, there are four locking pins 5 at each end of the device. The locking pins 5 at both ends are in the same orientation relative to each other, and are all in the four cardinal directions of up, down, left, and right relative to the plane of the bearing boss 31. The pre-tensioning belt 6 is preferably a belt. The belt is straddled and tensioned between the bearing bosses 31 at both ends. The two ends of the belt are tightly hung on the locking pins 5 at the same orientation at both ends, applying a pre-tensioning force to the bearing rod 1 to prevent the threads from loosening. The fastening screws 51 of the locking pins 5 are subjected to the tension of the belt, and the top plate 52 restricts the belt from falling off.

[0026] In this way, the locking pin 5 not only locks the elastic washer 4, but also works with the belt to tighten the load-bearing rod 1, thus playing a dual role in preventing loosening.

[0027] The device is detachably secured between the two gate hinges. The anti-detachment device is also detachably secured between the two gate hinges of the tailrace valve, with its elastic rubber gasket making surface contact with the outer circumference of the gate hinge, providing load-bearing capacity and anti-loosening performance. This device applies a restraining force to prevent the gate hinges from accidentally slipping during the entire opening and closing process of the tailrace valve.

[0028] Its working mechanism is as follows: The device body is placed between the two door hinges. During operation, the rotating central force-applying rod 2 drives the connected double-headed irregular threaded support rod 1 to rotate synchronously. The two ends of the support rod 1 are respectively engaged with the cam screws 3 on the left and right sides through reverse threads. Therefore, the rotational motion of the force-applying rod 2 can be converted into the synchronous axial extension and retraction displacement of the cam screws 3 on both sides. An elastic rubber pad is provided on the end face of the boss structure of the cam screw 3. When the screw extends outward, the boss applies an initial radial preload to the door hinges on both sides through the rubber pad, realizing the initial positioning and constraint of the device. After the force-applying rod 2 rotates to apply the final clamping force, the locking pins 5 distributed around the boss (usually in four directions) are further manually tightened. These locking pins 5 firmly lock the rubber pad base to prevent it from loosening in subsequent operations. At the same time, 2 to 4 belts are selected to connect the locking pins 5 on both sides through the belts. The preload applied by the belts to the double-headed irregular threaded support rod 1 is applied to prevent the threads from loosening during operation.

[0029] Even during the subsequent opening and closing of the tailrace inspection gate, the constraint force applied by the device can still be reliably maintained due to the continuous elasticity provided by the compressed elastic rubber gasket. This elasticity can adaptively compensate for minor displacements or vibrations, thereby continuously pressing against the gate hinge and fundamentally preventing it from dislodging from the predetermined position, ensuring operational safety.

[0030] 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 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.

Claims

1. A tailrace maintenance gate hinge anti-detachment device, characterized in that, include The support rod (1) has a through hole (11) in the middle of its body, and the two ends of the support rod are respectively provided with internal threads with opposite directions of rotation; Two cam screws (3) are respectively connected to the two ends of the support rod (1); each cam screw (3) includes an integral bearing boss (31) and a screw section (32) extending from the bearing boss (31), and the screw section (32) respectively meshes with the internal thread; The force-applying rod (2) is inserted into the through hole (11) of the load-bearing rod (1) during use, and is used to drive the load-bearing rod (1) to rotate around its own central axis; An elastic gasket (4) is provided on the end face of the bearing boss (31) for adaptive compensation of displacement or vibration; A circumferential locking assembly is distributed circumferentially along the bearing boss (31) and fixes the elastic gasket (4) to the end face of the bearing boss (31); In this process, the force-bearing rod (1) is rotated by the force-applying rod (2), thereby driving the cam screws (3) on both sides to convert into synchronous reverse axial extension and retraction motion, so that the elastic pad (4) is pressed against the external door hinge.

2. The tailrace maintenance gate shaft anti-detachment device as described in claim 1, characterized in that, The end face of the pressure-bearing boss (31) is provided with a recessed receiving cavity (33).

3. The tailrace maintenance gate hinge anti-detachment device as described in claim 2, characterized in that, The elastic gasket (4) is at least partially housed in the receiving cavity (33) opened on the end face of the pressure-bearing boss (31), and protrudes from the end face of the pressure-bearing boss (31).

4. The tailrace maintenance gate hinge anti-detachment device as described in claim 3, characterized in that, The base of the elastic pad (4) is locked in the receiving cavity (33) by the circumferential locking assembly to prevent the elastic pad (4) from loosening.

5. The tailrace maintenance gate shaft anti-detachment device according to claim 3, characterized in that, The elastic gasket (4) includes a positioning flange (41) and an end face gasket (42).

6. The tailrace maintenance gate shaft anti-detachment device according to claim 5, characterized in that, The positioning flange (41) is fitted into the accommodating cavity (33); the end face gasket (42) extends outward from the positioning flange (41) and covers the end face of the pressure-bearing boss (31) for contact with the outside.

7. The tailrace maintenance gate hinge anti-detachment device as described in claim 1, characterized in that, The circumferential locking assembly includes multiple locking pins (5), each locking pin (5) includes a top plate (52) and a fastening screw (51). The pressure-bearing boss (31) is provided with a screw hole (34) in the circumferential direction. After the fastening screw (51) passes through the screw hole (34), it presses and fixes the elastic gasket (4).

8. The tailrace maintenance gate hinge anti-detachment device as described in claim 7, characterized in that, The number of the locking pins (5) is four, and they are arranged in the four directions connected to the plane of the pressure-bearing boss.

9. The tailrace maintenance gate shaft anti-detachment device as described in claim 7, characterized in that, The internal thread includes a first internal thread (21) and a second internal thread (22) with the opposite direction of the first internal thread (21); the cam screw (3) includes a first cam screw (301) and a second cam screw (302), the first screw section (32) of the first cam screw (301) is provided with an external thread that matches the first internal thread (21); the second screw section (32) of the second cam screw (302) is provided with an external thread that matches the second internal thread (22).

10. The tailrace maintenance gate shaft anti-detachment device as described in claim 7, characterized in that, Includes a pretensioning band (6), which tensions the first cam screw (301) and the second cam screw (302) together, that is, the two ends are respectively tightly attached to the pins (5) at both ends of the load-bearing rod (1), and is used to apply a pretensioning force to the load-bearing rod (1) to prevent loosening.

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