Manhole cover opening balancer

Abstract

The invention relates to the technical field of manhole structures, and provides a manhole cover opening balancer aiming at the situation that a traditional manhole cover is inconvenient to open, the manhole cover opening balancer comprises a manhole flange seat, a manhole cover and a balance mechanism, and the manhole cover is located above the manhole flange seat; the balance mechanism comprises a lower connecting block and an upper connecting block, the lower connecting block and the upper connecting block are connected to the outer side of the manhole flange base and the outer side of the manhole cover respectively, and the lower connecting block and the upper connecting block are oppositely arranged. The end, away from the manhole cover, of the upper connecting block is hinged to the end, away from the manhole flange base, of the lower connecting block, a balance air cylinder is arranged on the lower connecting block, and the two ends of the balance air cylinder are hinged to the upper connecting block and the lower connecting block respectively. And the axial direction of the rotating shafts at the two ends of the balance cylinder pipe is parallel to the axial direction of the hinged end of the upper connecting block. The manhole cover has the effect of reducing the opening difficulty of the manhole cover.

Description

Technical Field

[0001] The present application relates to the field of manhole structures, and in particular to a manhole cover opening balancer. Background Art

[0002] During long-term operation, the internal components of large chemical equipment such as reactors will inevitably wear out or be damaged, requiring maintenance personnel to enter the reactor to perform repairs and replacements.

[0003] In order to facilitate the subsequent maintenance personnel to enter and exit the reactor, a manhole is opened on the top of the reactor cover and a manhole flange seat is installed. At the same time, a manhole cover for blocking the manhole seat is installed on the top of the manhole flange seat. The manhole cover is hinged on the outside of the manhole flange seat, and the manhole cover and the manhole flange seat are connected and fixed by bolts and nuts. When subsequent maintenance personnel need to enter and exit the reactor through the manhole, they remove the bolts and nuts connecting the manhole cover and the manhole flange seat, and lift the manhole cover from the manhole flange seat to open the manhole.

[0004] With regard to the above-mentioned related technologies, during the maintenance of the reactor, maintenance personnel are required to frequently lift and swing the manhole cover to open the manhole. However, the manhole cover is currently usually made of stainless steel and is relatively heavy. It is relatively difficult to lift and lower the manhole cover by hand, which makes it inconvenient to open the manhole cover. Therefore, there is room for improvement. Summary of the invention

[0005] In order to reduce the difficulty of opening a manhole cover, the present application provides a manhole cover opening balancer.

[0006] The present application provides a manhole cover opening balancer, which adopts the following technical solution: A manhole cover opening balancer comprises a manhole flange seat, a manhole cover and a balancing mechanism, wherein the manhole cover is located above the manhole flange seat; the balancing mechanism comprises a lower connecting block and an upper connecting block, wherein the lower connecting block and the upper connecting block are respectively connected to the outer side of the manhole flange seat and the outer side of the manhole cover, and the lower connecting block and the upper connecting block are arranged opposite to each other, and one end of the upper connecting block away from the manhole cover is hinged to one end of the lower connecting block away from the manhole flange seat, and the lower connecting block is provided with a balancing cylinder, and two ends of the balancing cylinder are respectively hinged to the upper connecting block and the lower connecting block, and the axial direction of the rotating axis at both ends of the balancing cylinder tube is arranged parallel to the axial direction of the hinged end of the upper connecting block.

[0007] By adopting the above technical solution, during the process of opening the manhole cover, the weight of the manhole cover can be balanced by the balancing cylinder, so that the manhole cover can be driven to swing to any angle and the manhole cover can be immediately supported and fixed. Compared with the traditional method of manually lifting and swinging the manhole cover by maintenance personnel, the difficulty of opening the manhole cover is effectively reduced.

[0008] Preferably, a support air bag is provided on a side of the upper connecting block facing the lower connecting block, and the support air bag is connected to an air source.

[0009] By adopting the above technical scheme, when the balancing cylinder drives the upper connecting block to drive the manhole cover to swing in the direction away from the manhole flange seat, gas is filled into the supporting airbag through the air source to expand the supporting airbag. On the one hand, the supporting airbag can assist the balancing cylinder to lift the upper connecting block, and on the other hand, the expanded supporting airbag can assist in supporting the upper connecting block, which is beneficial to improving the stress condition of the balancing cylinder; when the balancing cylinder drives the upper connecting block to drive the manhole cover to swing in the direction close to the manhole flange seat, the gas in the supporting airbag is gradually extracted through the air source, so that the supporting airbag can be used to assist in controlling the downward swinging speed of the manhole cover, which is beneficial to the smooth swinging of the manhole cover.

[0010] Preferably, a hinge shaft is supported at one end of the lower connecting block away from the manhole flange seat, and a plurality of ear plates are supported on the upper connecting block corresponding to the hinge shaft, and the ear plates are rotatably connected to the hinge shaft through bearings.

[0011] By adopting the above technical solution, the upper connecting block can be firmly hinged to the lower connecting block; the setting of the bearing is conducive to reducing the friction between the ear plate and the hinge shaft, reducing the wear of the ear plate and the intersection when the ear plate rotates around the hinge shaft, so that the subsequent swing of the manhole cover is more stable and smooth.

[0012] Preferably, a clamping portion is also supported on the upper connecting block, and the clamping portion is arranged toward the hinge shaft. The upper connecting block also supports a sliding drive member corresponding to the clamping portion, and the sliding drive member is drivingly connected to the clamping portion, and the sliding drive member is used to drive the clamping portion to move toward or away from the hinge shaft.

[0013] By adopting the above technical solution, when the balancing cylinder drives the upper connecting block to drive the manhole cover to swing to any angle, the sliding drive part can drive the clamping part to move in the direction close to the hinge axis until the clamping part is clamped against the outer periphery of the hinge axis. The clamping part is used to assist in limiting the rotation of the upper connecting block around the hinge axis, which is beneficial to improving the overall force condition of the balancing cylinder.

[0014] Preferably, an annular mounting groove is provided on the outer periphery of one side of the manhole cover facing the manhole flange seat, an annular top supporting airbag is embedded in the annular mounting groove, and the annular top supporting airbag is connected to an air source.

[0015] By adopting the above technical solution, when the manhole flange needs to be opened later, the annular top support airbag can be inflated through the air source to expand the annular top support airbag, and the annular top support airbag can be used to push the manhole cover away from the top end of the manhole flange seat to reduce the initial load of the balancing cylinder, which is conducive to the balancing cylinder to more easily drive the upper connecting block to drive the manhole cover to swing upward.

[0016] Preferably, a support block is protruded from the side of the manhole flange seat away from the lower connecting block; an abutment block is protruded from the side of the manhole cover away from the upper connecting block; a top support assembly is provided on the support block, and the top support assembly is arranged opposite to the abutment block, and the top support assembly includes a support sleeve, the top end of the support sleeve is slidably connected to a top support block, and the bottom end of the top support block is connected to a plurality of support springs, and the support springs are used to drive the top support block to extend out of the top end of the support sleeve.

[0017] By adopting the above technical solution, on the one hand, when opening the manhole cover, the support spring in the support sleeve can cooperate with the support block to assist in pushing the manhole cover upward and away from the manhole flange seat, which is beneficial to reducing the initial load of the balancing cylinder, making it easier for the balancing cylinder to drive the manhole cover to swing upward; on the other hand, when closing the manhole cover subsequently, the support block can cooperate with the support spring to assist in supporting and cushioning the manhole cover that swings downward, thereby reducing the manhole cover from directly impacting the top of the manhole flange cover.

[0018] Preferably, a locking piece is further provided on the supporting sleeve, and the locking piece is used to limit the sliding of the supporting block along the supporting sleeve.

[0019] By adopting the above technical solution and setting the locking piece, the balancing cylinder subsequently drives the manhole cover to swing downward to fit the top of the manhole flange seat, and then the locking piece is used to limit the sliding of the top support block to limit the upward movement of the top support block under the action of the supporting spring, causing the manhole cover to be pushed away from the manhole flange seat, affecting the manhole cover closing the manhole flange seat.

[0020] Preferably, the locking member comprises a locking bolt, the locking bolt is threadedly disposed on the outer circumference of the support sleeve, and one end of the locking bolt extends into the inner cavity of the support sleeve.

[0021] By adopting the above technical solution, the locking bolt is turned until the locking bolt is tightly against the outer periphery of the top support block, so as to achieve the limit fixation of the top support block. The locking bolt is loosened until the locking bolt is separated from the top support block, so as to release the limit fixation of the top support block.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the setting of the balancing mechanism, when the manhole cover needs to be opened later, the weight of the manhole cover can be balanced by the balancing cylinder, and the manhole cover can be driven to swing upward to open the manhole. At the same time, the manhole cover can be driven to swing to any desired angle by controlling the extension and contraction amount of the balancing cylinder piston rod, and the opened manhole cover can be supported and fixed by the balancing cylinder to limit the swing of the manhole cover and reduce the situation where the manhole cover is accidentally closed due to accidental touch.

[0023] 2. By supporting a support air bag on one side of the upper connecting block toward the lower connecting block, on the one hand, when the manhole cover is subsequently opened, the upper connecting block can be lifted upward by inflating the support air bag, which is beneficial to reduce the initial load of the balancing cylinder and makes it easier for the balancing cylinder to drive the upper connecting block and the manhole cover to swing upward.

[0024] 3. By setting a locking piece on the connecting sleeve, after the balancing cylinder drives the manhole cover to swing to fit the top of the manhole flange seat, the locking piece is used to limit the upward movement of the support block under the operation of the support spring to reduce the situation where the manhole cover is pushed away from the top of the manhole flange seat by the support block, resulting in the manhole cover being unable to close the manhole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the manhole cover opening balancer used in the embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the structure after the applicant's manhole cover is opened.

[0027] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0028] Figure 4 yes Figure 2 Enlarged schematic diagram of part B in the middle.

[0029] Figure 5 It is a structural schematic diagram used to illustrate the balancing mechanism in an embodiment of the present application.

[0030] Figure 6 yes Figure 5 Enlarged schematic diagram of part C in the middle.

[0031] Description of reference numerals: 1. Manhole flange seat; 11. Support block; 2. Manhole cover; 21. Abutment block; 22. Annular mounting groove; 23. Annular top support airbag; 3. Balancing mechanism; 31. Lower connecting block; 311. Articulated shaft; 32. Upper connecting block; 321. Ear plate; 322. Support groove; 323. Support airbag; 33. Balancing cylinder; 34. Abutment portion; 341. Support plate; 342. Rubber block; 35. Sliding cylinder; 4. Top support assembly; 41. Support sleeve; 42. Top support block; 43. Support spring; 44. Locking bolt. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-6 This application is described in further detail.

[0033] The present application embodiment discloses a manhole cover opening balancer, referring to Figure 1 and Figure 2, including a manhole flange seat 1, a manhole cover 2 and a balancing mechanism 3. The manhole cover 2 is supported on the top of the manhole flange and fits on the end surface of the top of the manhole flange to block the manhole flange seat 1; the balancing mechanism 3 includes a lower connecting block 31 connected to the outer peripheral side of the manhole flange seat 1 and an upper connecting block 32 connected to the outer peripheral side of the manhole cover 2. The lower connecting block 31 and the upper connecting block 32 are arranged opposite to each other, and one end of the upper connecting block 32 away from the manhole cover 2 is hinged to the end of the lower connecting block 31 away from the manhole flange seat 1; balancing cylinders 33 are supported on opposite sides of the lower connecting block 31, and two ends of the balancing cylinder 33 are respectively hinged to the upper connecting block 32 and the lower connecting block 31, and the rotating axes at both ends of the balancing cylinder 33 are arranged parallel to the rotating axes of the hinged ends of the upper connecting block 32.

[0034] The manhole cover 2 and the manhole flange seat 1 are connected and fixed at their outer circumferences by a number of bolts and nuts (not shown in the figure) to facilitate the manhole cover 2 to firmly seal the manhole flange seat 1. Both the manhole cover 2 and the manhole flange seat 1 are provided with connecting through holes on their outer circumferences for the bolts to pass through.

[0035] When the manhole cover 2 needs to be opened later, after the bolts and nuts connecting the manhole cover 2 and the manhole flange seat 1 are removed, the gravity of the manhole cover 2 can be balanced by two balancing cylinders 33 to drive the manhole cover 2 to swing upward, thereby realizing the opening of the manhole cover 2.

[0036] Reference Figure 2 and Figure 3 , an annular mounting groove 22 is provided around the outer periphery of the manhole cover 2 facing the manhole flange seat 1, and an annular top support airbag 23 is installed in the annular mounting groove 22, and the annular top support airbag 23 is connected to the air source through an air pipe. Through the above arrangement, on the one hand, when the manhole cover 2 is subsequently opened, the annular top support airbag 23 can be inflated through the air source, so that the manhole cover 2 is lifted from the top end face of the manhole flange seat 1 by the expanded annular top support airbag 23, which is conducive to reducing the initial load of the two balancing cylinders 33, so that the two balancing cylinders 33 can more easily drive the manhole cover 2 to swing upward. On the other hand, after the manhole cover 2 and the manhole flange seat 1 are connected by bolts and nuts, the annular top support airbag 23 can be inflated to expand the annular top support airbag 23 and press against the top end face of the manhole flange seat 1, so as to achieve the sealing of the gap at the connection between the manhole cover 2 and the manhole flange seat 1.

[0037] Reference Figure 2 and Figure 4, a support block 11 is also convexly provided on the periphery of the manhole flange seat 1, and the support block 11 is located on the side of the manhole flange seat 1 away from the lower connecting block 31; an abutment block 21 is convexly provided on the periphery of the manhole cover 2, and the abutment block 21 is located on the side of the manhole cover 2 away from the upper connecting block 32. When the manhole cover 2 is attached to the top end face of the manhole flange seat 1, the support block 11 and the abutment block 21 are opposite to each other and a gap is left. A top support assembly 4 is provided on the support block 11, and the top support assembly 4 includes a support sleeve 41, a top support block 42 and a plurality of support springs 43. The bottom end of the support sleeve 41 is fixed on the support block 11, and the top support block 42 is slidably inserted into the top end of the support sleeve 41. The support spring 43 is located in the inner cavity of the support sleeve 41, and the two ends of the support spring 43 are respectively connected to the top support block 42 and the bottom wall of the inner cavity of the support sleeve 41, and the support spring 43 is used to drive the top support block 42 to extend upward from the support sleeve 41.

[0038] By setting the supporting assembly 4, on the one hand, when the manhole cover 2 is subsequently opened, the side of the manhole cover 2 away from the upper connecting block 32 can be lifted upward by the supporting spring 43 in cooperation with the supporting block 42, which is conducive to further reducing the initial load of the two balancing cylinders 33, so that the balancing cylinder 33 drives the manhole cover 2 to swing upward. On the other hand, when the balancing cylinder 33 drives the manhole cover 2 to swing downward to block the top end face of the manhole flange seat 1, the supporting block 42 can be used to assist in buffering the manhole cover 2 that swings downward, so as to limit the manhole cover 2 from directly impacting the manhole flange seat 1.

[0039] The support sleeve 41 is also provided with a locking member for limiting the sliding of the supporting block 42 along the support sleeve 41, and the locking member includes a locking bolt 44, which is threadedly arranged on the top of the outer side of the support sleeve 41 and one end of the locking bolt 44 extends to the inner cavity of the support sleeve 41. Through the setting of the locking member, after the manhole cover 2 is driven by the balancing cylinder 33 to swing downward until the manhole cover 2 fits the top of the manhole flange seat 1, the locking bolt 44 is screwed until the locking bolt 44 is pressed against the outer side of the supporting block 42 located in the support sleeve 41 at this time, so as to limit the supporting block 42 from sliding upward out of the support sleeve 41 by the locking bolt 44, thereby reducing the situation in which the connection and fixation of the bolts and nuts between the manhole cover 2 and the manhole flange seat 1 are affected due to the supporting block 42 lifting the manhole cover 2.

[0040] Reference Figure 1 and Figure 3, the connection between the balancing cylinder 33 and the lower connecting block 31 is located at one end of the lower connecting block 31 close to the manhole flange seat 1. The connection between the balancing cylinder 33 and the upper connecting block 32 is located at one end of the upper connecting block 32 close to the manhole cover 2. A hinge shaft 311 is horizontally supported at one end of the lower connecting block 31 away from the manhole flange seat 1, and both ends of the hinge shaft 311 are mounted on the lower connecting block 31 through supports. Two ear plates 321 are protruded on the side of the upper connecting block 32 facing the lower connecting block 31 corresponding to the hinge shaft 311, and the two ear plates 321 are respectively rotatably connected to the hinge shaft 311 through bearings. Through the above settings, the upper connecting block 32 is firmly hinged to the lower connecting block 31. At the same time, the setting of the bearing effectively reduces the friction between the ear plate 321 and the hinge shaft 311, which is conducive to limiting the wear of the ear plate 321 and the hinge shaft 311 during the subsequent rotation of the ear plate 321 around the hinge shaft 311.

[0041] Reference Figure 5 and Figure 6 The upper connecting block 32 is also provided with a clamping portion 34 on one side facing the lower connecting block 31. The clamping portion 34 is located between the two ear plates 321 and is arranged toward the hinge shaft 311. The clamping portion 34 includes a support plate 341. A rubber block 342 is fixed to the side of the support plate 341 close to the hinge shaft 311. The upper connecting block 32 is also provided with a sliding drive member corresponding to the clamping portion 34. The sliding drive member is drivingly connected to the clamping portion 34 and is used to drive the clamping portion 34 to move toward or away from the hinge shaft 311. Specifically, the sliding drive member includes a sliding cylinder 35. The sliding cylinder 35 is supported and installed on the side of the upper connecting block 32 away from the lower connecting block 31 and is arranged toward the hinge shaft 311. The piston rod of the sliding cylinder 35 is penetrated through the upper connecting block 32 and is connected to the support plate 341, so that the sliding drive member is driven and connected to the clamping portion 34.

[0042] By setting the clamping part 34 and the sliding drive component, after the balancing cylinder 33 drives the manhole cover 2 to swing to any angle, the sliding cylinder 35 drives the support plate 341 of the clamping part 34 to drive the rubber block 342 to swing towards the direction close to the hinge shaft 311, until the rubber block 342 on the support plate 341 is pressed against the outer periphery of the hinge shaft 311. The sliding drive component cooperates with the clamping part 34 to assist the two balancing cylinders 33 to limit the swing of the upper connecting block 32 around the hinge shaft 311, which is beneficial to improve the force condition of the two balancing cylinders 33 at this time. At the same time, when the balancing cylinder 33 fails, the swing of the upper connecting block 32 can continue to be limited to reduce the situation of accidental closing of the manhole cover 2.

[0043] Reference Figure 2, a support groove 322 is recessed on one side of the upper connection toward the lower connection block 31, a support airbag 323 is installed in the support groove 322, and the support airbag 323 is connected to the air source through an air pipe. When the manhole cover 2 is subsequently opened by the balancing cylinder 33, air is inflated into the support airbag 323 through the air source, and the expanded support airbag 323 is used to assist in pushing the upper connection block 32 away from the lower connection block 31, so as to further improve the initial load of the two balancing cylinders 33. At the same time, when the balancing cylinder 33 fails due to a fault or other reasons, the expanded support airbag 323 can be used to limit the manhole cover 2 and the upper connection block 32 from swinging downward, so as to limit the manhole cover 2 from falling directly and impacting the manhole flange seat 1. When the manhole cover 2 is subsequently closed by the balancing cylinder 33, the gas in the support airbag 323 is gradually extracted through the air source, so that while the balancing cylinder 33 drives the manhole cover 2 to swing downward, the support airbag 323 is used to buffer the manhole cover 2 swinging downward, which is conducive to the stable swing of the manhole cover 2.

[0044] The implementation principle of the embodiment of the present application is that when opening the manhole cover 2 on the manhole flange seat 1, after removing the bolts and nuts connecting the manhole cover 2 and the manhole flange seat 1, loosen the locking bolts 44 on the outer periphery of the support sleeve 41 to separate the locking bolts 44 from the top support block 42, and inflate the annular top support airbag 23 and the support airbag 323 from the air source, and at the same time, the two balancing air rods drive the manhole cover 2 to swing upward to realize the opening of the manhole cover 2. The balancing cylinder 33 drives the manhole cover 2 to swing to any angle and the balancing cylinder 33 can support and fix the manhole cover 2, which is conducive to reducing the difficulty of opening the manhole cover 2.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A manhole cover opening balancer, characterized in that: The invention comprises a manhole flange seat (1), a manhole cover (2) and a balancing mechanism (3), wherein the manhole cover (2) is located above the manhole flange seat (1); the balancing mechanism (3) comprises a lower connecting block (31) and an upper connecting block (32), wherein the lower connecting block (31) and the upper connecting block (32) are respectively connected to the outer side of the manhole flange seat (1) and the outer side of the manhole cover (2), and the lower connecting block (31) and the upper connecting block (32) are arranged opposite to each other, and one end of the upper connecting block (32) away from the manhole cover (2) is hinged to one end of the lower connecting block (31) away from the manhole flange seat (1), and the lower connecting block (31) is provided with a balancing cylinder (33), and two ends of the balancing cylinder (33) are respectively hinged to the upper connecting block (32) and the lower connecting block (31), and the axial direction of the rotating axis at both ends of the balancing cylinder (33) tube is arranged parallel to the axial direction of the hinged end of the upper connecting block (32).

2. A manhole cover opening balancer according to claim 1, characterized in that: A support air bag (323) is provided on one side of the upper connection block (32) facing the lower connection block (31), and the support air bag (323) is connected to an air source.

3. A manhole cover opening balancer according to any one of claims 1-2, characterized in that: A hinge shaft (311) is supported at one end of the lower connection block (31) away from the manhole flange seat (1), and a plurality of ear plates (321) are supported on the upper connection block (32) corresponding to the hinge shaft (311), and the ear plates (321) are rotatably connected to the hinge shaft (311) via bearings.

4. A manhole cover opening balancer according to claim 3, characterized in that: The upper connecting block (32) is also provided with a pressing portion (34), and the pressing portion (34) is arranged toward the hinge shaft (311). The upper connecting block (32) is also provided with a sliding drive member corresponding to the pressing portion (34), and the sliding drive member is drivingly connected to the pressing portion (34), and the sliding drive member is used to drive the pressing portion (34) to move in a direction close to or away from the hinge shaft (311).

5. The manhole cover opening balancer according to claim 1, characterized in that: An annular mounting groove (22) is provided on the outer periphery of one side of the manhole cover (2) facing the manhole flange seat (1), an annular top supporting air bag (23) is embedded in the annular mounting groove (22), and the annular top supporting air bag (23) is connected to an air source.

6. A manhole cover opening balancer according to claim 5, characterized in that: A support block (11) is protrudingly provided on the side of the manhole flange seat (1) away from the lower connecting block (31); a contact block (21) is protrudingly provided on the side of the manhole cover (2) away from the upper connecting block (32); a top support assembly (4) is provided on the support block (11), the top support assembly (4) and the contact block (21) are arranged opposite to each other, the top support assembly (4) comprises a support sleeve (41), the top end of the support sleeve (41) is slidably connected to a top support block (42), the bottom end of the top support block (42) is connected to a plurality of support springs (43), the support springs (43) are used to drive the top support block (42) to extend out of the top end of the support sleeve (41).

7. A manhole cover opening balancer according to claim 6, characterized in that: The support sleeve (41) is also provided with a locking piece, and the locking piece is used to limit the sliding of the supporting block (42) along the support sleeve (41).

8. A manhole cover opening balancer according to claim 7, characterized in that: The locking member comprises a locking bolt (44), wherein the locking bolt (44) is threadedly disposed on the outer periphery of the supporting sleeve (41), and one end of the locking bolt (44) extends into the inner cavity of the supporting sleeve (41).

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