A manhole cover assist device
By precisely adjusting the torsion spring assist device, the problem of difficult-to-open manhole covers on pressure vessels is solved, providing a low-cost and safe assist effect to meet different usage needs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HIMILE MECHANICAL MFG
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-03
AI Technical Summary
The manhole covers of existing pressure vessels are difficult to open manually, and the existing assistive devices are costly, pose safety hazards, and the spring torque cannot be precisely adjusted, affecting the performance.
A torsion spring assist device is adopted. By rotating the gear plate in both forward and reverse directions and cooperating with the end cover and the second shaft lug, the torsion spring assist is precisely adjusted to ensure that the flange cover has the best assist effect when closed and provides assistance by utilizing the elastic deformation of the torsion spring without the need for additional torque when opening.
It achieves a low-cost and safe torque boosting effect, can be precisely adjusted according to needs, avoids the danger of electric sparks, and adapts to different usage requirements.
Smart Images
Figure CN224453652U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure vessel equipment technology, specifically to a manhole cover assist device. Background Technology
[0002] When manhole covers on pressure vessels are opened upwards, they are often difficult to open manually due to gravity and friction, thus requiring the use of assistive devices. Existing assistive devices generally adopt hydraulic, pneumatic, or electric solutions, which are costly. In addition, manhole covers are not used frequently, and the assistive devices are idle for a long time. Furthermore, for pressure vessels with explosion-proof requirements, the operation of the electrical contacts of the above-mentioned types of assistive devices can increase safety hazards.
[0003] In existing technologies, springs are also used as assistive devices. The elastic force of the spring overcomes part of the weight of the manhole cover. When the manhole cover is closed, the spring acts as a damper, thereby reducing the impact. However, the manhole cover of a pressure vessel needs to be adjusted for frictional changes during assembly or after a period of use. The torque of existing springs cannot be adjusted precisely, making it difficult to ensure that the assistive device is always in optimal condition when the manhole cover is in use.
[0004] Therefore, developing and designing a manhole cover assist device that can precisely adjust the spring torque, ensure the assist effect, and eliminate the risk of electric spark hazards is an urgent problem to be solved at this stage. Summary of the Invention
[0005] To address the problems existing in the prior art, this utility model provides a manhole cover assist device. When adjusting the assist of the torsion spring, the gear disc is first rotated forward to fix one end of the torsion spring to the adjacent first adjustment part, which is equivalent to the second lug rotating forward. Then loosen the end cap from the second lug, allowing the second lug to rotate in the opposite direction. Then, the end cap and the second lug are re-fixed via the second adjustment section, so that the second lug finally rotates only a few degrees. In this case, the assistance generated by the torsion spring when the flange cover is opened and closed is precisely adjusted, where the forward and reverse directions are one of clockwise and counterclockwise, respectively. Since the flange cover's rotation range is usually only 90°, the first adjustment part on the gear plate and the second adjustment part on the end cover work together to ensure that the flange cover has the best assistance effect when closed, while the torsion spring can be in a natural state without generating torque when the flange cover is open. Only a small amount of manual force is needed to open or close the cover.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] This utility model provides a manhole cover assist device, comprising:
[0008] Manhole flange, wherein two first lugs are provided on one side of the manhole flange;
[0009] A flange cover, wherein two second lugs are provided on one side of the flange cover, and two first lugs are located between the two second lugs;
[0010] A rotating shaft passes through two first axle lugs and two second axle lugs, and is rotatable relative to the first axle lugs about its axis. A geared disc is fitted onto the portion of the rotating shaft located between the two first axle lugs. The geared disc has several first adjustment parts distributed circumferentially along its axis, and adjacent first adjustment parts are set at an angle based on the included angle of the geared disc's axis. ;
[0011] A torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixed to the first shaft lug, and the other end of the torsion spring is fixed to a first adjusting part;
[0012] Two end caps are fixedly connected to one end of the rotating shaft. Each end cap has m second adjustment parts distributed circumferentially along the rotating shaft. The end caps are detachably connected to the second shaft lugs through the second adjustment parts. Both m and n are positive integers, and m and n are coprime.
[0013] As a preferred technical solution, the first adjustment part is configured as a groove located at the outer edge of the gear plate.
[0014] As a preferred technical solution, the torsion spring includes two sections distributed on both sides of the first adjusting part, and the two sections of the torsion spring rotate in opposite directions.
[0015] As a preferred technical solution, an intermediate section is provided between the two torsion springs, and the intermediate section is embedded in the slot.
[0016] As a preferred technical solution, a locking part capable of positioning the gear disk is provided between the gear disk and the rotating shaft; the locking part includes a locking threaded through hole provided on the gear disk and extending radially along the gear disk, and a locking screw threadedly connected thereto is provided in the locking threaded through hole.
[0017] As a preferred technical solution, the rotating shaft is provided with a pin hole corresponding to the set screw through hole, and the set screw extends into the pin hole;
[0018] And / or, the gear disc is provided with adjustment holes on both sides of the set thread through hole.
[0019] As a preferred technical solution, the second adjustment part is provided as a connecting hole, and the second lug is provided with a threaded hole that matches the connecting hole. A connecting screw is provided in the connecting hole, and the connecting screw passes through the connecting hole and is threadedly connected to the threaded hole to fix the end cover to the second lug.
[0020] As a preferred technical solution, the end cap is provided with a groove that matches the shape of the end of the shaft, and one end of the shaft is embedded in the end cap.
[0021] As a preferred technical solution, the end of the rotating shaft is square, and the groove is a square groove that matches the shape of the end of the rotating shaft;
[0022] And / or, a spline is embedded between the groove and the end of the shaft.
[0023] As a preferred technical solution, when the flange cover is closed, the flange cover is horizontally positioned and the torsion spring is in a tightened state; when the flange cover is open, the flange cover is vertically positioned and the torsion spring is in a relaxed state; a limiting block is provided on the first shaft lug, and a limiting surface matching the limiting block is provided on the second shaft lug. When the flange cover is opened, the limiting block abuts against the limiting surface, which can prevent the flange cover from continuing to swing away from the manhole flange.
[0024] The beneficial effects of this utility model are as follows:
[0025] 1. In adjusting the assist of the torsion spring, this utility model first rotates the gear disc forward to fix one end of the torsion spring to the adjacent first adjustment part, which is equivalent to rotating the second lug forward. Then loosen the end cap from the second lug, allowing the second lug to rotate in the opposite direction. Then, the end cap and the second lug are re-fixed via the second adjustment section, so that the second lug finally rotates only a few degrees. In this case, the assistance generated by the torsion spring when the flange cover is opened and closed is precisely adjusted, where the forward and reverse directions are one of clockwise and counterclockwise, respectively. Since the flange cover's rotation range is usually only 90°, the first adjustment part on the gear plate and the second adjustment part on the end cover work together to ensure that the flange cover has the best assistance effect when closed, while the torsion spring can be in a natural state without generating torque when the flange cover is open. Only a small amount of manual force is needed to open or close the cover.
[0026] 2. This utility model relies on a torsion spring to generate assistance, requiring no other energy source, eliminating the risk of electrical sparks, further ensuring production safety, and is also low-cost, low-carbon, energy-saving, and environmentally friendly.
[0027] 3. The torsion spring of this utility model can be set to two sections or one section according to actual production needs, and the stiffness coefficient of the torsion spring can be increased or decreased by multiple accordingly to adapt to different assistance requirements; in addition, the amount of assistance generated by the torsion spring of this utility model can be adjusted during assembly and use, effectively meeting production needs. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the manhole cover assist device of this utility model;
[0029] Figure 2 for Figure 1 Top view;
[0030] Figure 3 for Figure 1 The main view;
[0031] Figure 4 for Figure 1 A schematic diagram of the structure of the pivot, torsion spring and end cap;
[0032] Figure 5 for Figure 4 A sectional view;
[0033] Figure 6 for Figure 4 The main view;
[0034] Figure 7 for Figure 4 A schematic diagram of the toothed disc structure in the diagram;
[0035] Figure 8 for Figure 4 A schematic diagram of the torsion spring in the diagram.
[0036] In the diagram: 1-Manhole flange, 11-First lug, 12-Limit block, 2-Flange cover, 21-Second lug, 22-Limit surface, 3-Rotating shaft, 31-Pin hole, 4-Gear disc, 41-Slot, 42-Setting thread through hole, 43-Setting screw, 44-Adjusting hole, 5-Torsion spring, 51-Intermediate section, 6-End cover, 61-Connecting hole, 62-Connecting screw. Detailed Implementation
[0037] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.
[0038] Please refer to Figures 1-8This invention provides an embodiment of a manhole cover assist device, comprising a manhole flange 1, a flange cover 2, a rotating shaft 3, a torsion spring 5, and two end caps 6. The manhole flange 1 has two first lugs 11 on one side, and the flange cover 2 has two second lugs 21 on one side. The two first lugs 11 are located between the two second lugs 21. The rotating shaft 3 passes through the two first lugs 11 and the two second lugs 21, and is capable of rotating relative to the first lugs 11 around its axis. A gear plate 4 is fitted on the portion between the two first lugs 11. The gear plate 4 has five first adjustment parts distributed circumferentially along its axis. The first adjustment parts are slots 41 located on the outer edge of the gear plate 4. A torsion spring 5 is fitted on the rotating shaft 3. One end of the torsion spring 5 is fixed to the first lug 11, and the other end of the torsion spring 5 is fixed to a slot 41. When the flange cover 2 swings relative to the manhole flange 1 with the rotating shaft 3 as the axis, the torque generated by the torsion spring 5 is the assist when the flange cover 2 is opened and closed.
[0039] The included angle α between adjacent slots 41 based on the axis of the gear disk 4 is: At this time, n=7. When the gear disk 4 is rotated so that one end of the torsion spring 5 is fixed to the adjacent slot 41, the second shaft lug 21 rotates at an angle of about 51.3°.
[0040] Meanwhile, the two end caps 6 are fixedly connected to both ends of the rotating shaft 3, and the end caps 6 are provided with eight (m=8) second adjustment parts distributed circumferentially along the rotating shaft 3. The second adjustment parts are configured as connecting holes 61. The end caps 6 are detachably connected to the second shaft lugs 21 through the connecting holes 61 and connecting screws 62. At this time, the included angle β between adjacent connecting holes 61 based on the axis of the rotating shaft 3 is... After removing the end cover 6 from the second lug 21, rotate the second lug 21 by an integer multiple of the included angle β, and then fix the end cover 6 to the second lug 21 to adjust the opening degree of the flange cover 2 relative to the manhole flange 1.
[0041] In actual production, the gear 4 is first rotated forward to fix one end of the torsion spring 5 onto the adjacent slot 41, which is equivalent to the second lug 21 rotating forward by about 51.3°. Then, the end cover 6 is loosened from the second lug 21, the second lug 21 is rotated counterclockwise by 45°, and then the end cover 6 is re-fixed to the second lug 21. This allows the second lug 21 to adjust the assistance generated by the torsion spring 5 when the flange cover 2 is opened and closed with only about 6.3° of rotation, greatly improving accuracy. Here, forward and counterclockwise are one of the clockwise and counterclockwise directions, respectively. Furthermore, if the above process cannot adjust the assistance to the ideal state, the above process can be repeated multiple times until the assistance of the flange cover 2 is adjusted to the ideal state. Furthermore, the rotation angle of the gear 4 can also be multiple times the included angle α, and the rotation angle of the second lug 21 can also be multiple times the included angle β, with the two working together to ensure that the second lug 21 can accurately adjust the assistance when the final rotation angle is small.
[0042] It should be noted that m and n are both positive integers, and m and n are coprime, to ensure that the angle difference will not be zero after the gear 4 rotates in the forward direction and the second shaft lug 21 rotates in the reverse direction; more preferably, in actual production, for the convenience of processing and operation, m and n should not be greater than 8.
[0043] In other embodiments, the first adjustment part may also be a positioning hole that matches one end of the torsion spring 5, so as to stably position one end of the torsion spring 5 and facilitate the engagement of one end of the torsion spring 5 with other first adjustment parts.
[0044] It should be noted that the end cap 6 should be provided with a groove that matches the shape of the end of the rotating shaft 3, and one end of the rotating shaft 3 is embedded in the end cap 6; in order to ensure that the rotating shaft 3 and the end cap 6 rotate synchronously, the end of the rotating shaft 3 is preferably square, and the groove is a square groove that matches the shape of the end of the rotating shaft 3; and / or, the groove and the end of the rotating shaft 3 can also be fixed by inlaying splines to improve the fixing effect.
[0045] For details, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6When the flange cover 2 is closed, it is horizontally positioned, and the torsion spring 5 is in a tightened state. The torque generated by the torsion spring 5 is just enough to balance the weight of the flange cover 2. When the flange cover 2 is fully open, it is vertically positioned and does not require assistance. At this time, the torsion spring 5 is in a natural state. In order to limit the maximum opening angle of the flange cover 2 to 90°, a limiting block 12 is provided on the first lug 11, and a limiting surface 22 matching the limiting block 12 is provided on the second lug 21. When the flange cover 2 is opened, the limiting block 12 abuts against the limiting surface 22, which can prevent the flange cover 2 from continuing to swing away from the manhole flange 1.
[0046] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8 The torsion spring 5 includes two segments distributed on both sides of the first adjustment part. The two segments of the torsion spring 5 rotate in opposite directions. When the flange cover 2 is opened or closed, the two segments of the torsion spring 5 generate elastic deformation accordingly to provide assistance. The stiffness coefficient of the two segments of the torsion spring 5 increases relative to the single segment of the torsion spring 5, which can adapt to different assistance requirements. In other embodiments, the number of segments of the torsion spring 5 can also be set to only one segment, with its two ends respectively set on the first shaft lug 11 and a slot 41, so as to be able to apply stable assistance to the flange cover 2.
[0047] Further, please refer to Figure 8 An intermediate section 51 is provided between the two torsion springs 5. The intermediate section 51 is embedded in the slot 41, which can simultaneously realize the positioning between the two springs and the slot 41. It can also adjust one end of the two springs to the other slot 41 when the gear plate 4 rotates.
[0048] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 7 A locking part is provided between the gear disk 4 and the rotating shaft 3 to position the gear disk 4. The locking part includes a locking threaded through hole 42 provided on the gear disk 4 and extending radially along the gear disk 4. A locking screw 43 is provided in the locking threaded through hole 42 and threadedly connected thereto. A pin hole 31 is provided on the rotating shaft 3 corresponding to the locking threaded through hole 42. The locking screw 43 extends into the pin hole 31, thereby fixing the gear disk 4 and the rotating shaft 3. Specifically, a pin can be provided at one end of the locking screw 43 near the pin hole 31. The size of the pin matches the pin hole 31, which can achieve a better fixing effect on the gear disk 4 and the rotating shaft 3.
[0049] Further, please refer to Figure 7The gear 4 is provided with adjustment holes 44 on both sides of the set thread through hole 42. By inserting the tool into the adjustment hole 44, the gear 4 can be driven to rotate more easily by using the lever principle.
[0050] In this embodiment, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 6 The second lug 21 should have a threaded hole that matches the connecting hole 61. The connecting screw 62 in the connecting hole 61 passes through the connecting hole 61 and is threadedly connected to the threaded hole to fix the end cover 6 to the second lug 21.
[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A manhole cover assist device, characterized by, include: Manhole flange (1), wherein two first lugs (11) are provided on one side of the manhole flange (1). Flange cover (2), one side of which is provided with two second lugs (21), and two first lugs (11) are located between the two second lugs (21); A rotating shaft (3) passes through two first lugs (11) and two second lugs (21), and the rotating shaft (3) is rotatable about its axis relative to the first lugs (11); a gear disk (4) is fitted on the portion of the rotating shaft (3) located between the two first lugs (11), and the gear disk (4) is provided with a plurality of first adjustment parts distributed circumferentially along its axis, the angle between adjacent first adjustment parts being set based on the included angle of the axis of the gear disk (4). ; Torsion spring (5), the torsion spring (5) is sleeved on the rotating shaft (3), one end of the torsion spring (5) is fixed on the first shaft lug (11), and the other end of the torsion spring (5) is fixed on a first adjusting part; Two end caps (6) are fixedly connected to one end of the rotating shaft (3). The end caps (6) are provided with m second adjustment parts distributed circumferentially along the rotating shaft (3). The end caps (6) are detachably connected to the second shaft lugs (21) through the second adjustment parts. m and n are both positive integers, and m and n are coprime.
2. The manhole cover assist device according to claim 1, characterized in that, The first adjustment part is configured as a slot (41) located at the outer edge of the toothed disc (4).
3. A manhole cover assist device according to claim 2, wherein, The torsion spring (5) includes two sections distributed on both sides of the first adjustment part, and the two sections of the torsion spring (5) rotate in opposite directions.
4. A manhole cover assist device according to claim 3, wherein An intermediate section (51) is provided between the two torsion springs (5), and the intermediate section (51) is embedded in the slot (41).
5. A manhole cover assist device according to claim 1, wherein, A locking part is provided between the gear disk (4) and the rotating shaft (3) to position the gear disk (4); the locking part includes a locking thread through hole (42) provided on the gear disk (4) and extending radially along the gear disk (4), and a locking screw (43) is provided in the locking thread through hole (42) and threadedly connected thereto.
6. A manhole cover assist device according to claim 5, wherein, The rotating shaft (3) is provided with a pin hole (31) corresponding to the set screw thread through hole (42), and the set screw (43) extends into the pin hole (31); And / or, the gear disc (4) is provided with adjustment holes (44) on both sides of the set thread through hole (42).
7. A manhole cover assist device as claimed in claim 1, wherein, The second adjustment part is provided as a connecting hole (61), and the second lug (21) is provided with a threaded hole that matches the connecting hole (61). A connecting screw (62) is provided in the connecting hole (61). The connecting screw (62) passes through the connecting hole (61) and is threadedly connected to the threaded hole to fix the end cap (6) and the second lug (21).
8. A manhole cover assist device according to claim 1, wherein, The end cap (6) is provided with a groove that matches the shape of the end of the shaft (3), and one end of the shaft (3) is embedded in the end cap (6).
9. A manhole cover assist device according to claim 8, wherein, The end of the rotating shaft (3) is square, and the groove is a square groove that matches the shape of the end of the rotating shaft (3); And / or, a spline is embedded between the groove and the end of the shaft (3).
10. A manhole cover assist device according to claim 1, wherein, When the flange cover (2) is closed, the flange cover (2) is horizontally positioned and the torsion spring (5) is in a tightened state; when the flange cover (2) is open, the flange cover (2) is vertically positioned and the torsion spring (5) is in a natural state; a limiting block (12) is provided on the first shaft lug (11) and a limiting surface (22) matching the limiting block (12) is provided on the second shaft lug (21). When the flange cover (2) is opened, the limiting block (12) abuts against the limiting surface (22), which can prevent the flange cover (2) from continuing to swing away from the manhole flange (1).