Built-in transmission cover plate assembling and disassembling device

Abstract

The utility model discloses a built-in transmission cover plate assembling and disassembling device which comprises a rail support, an orifice mounting structure is arranged on the rail support, a main sleeve assembly moving in the axial direction is arranged in the rail support, the front portion of the main sleeve assembly is hinged to a first hinge point of a rotating arm assembly, and a transmission connecting rod assembly moving in the axial direction is arranged in the main sleeve assembly. The front portion of the transmission connecting rod assembly is hinged to a transition connecting rod, the transition connecting rod is hinged to a second hinge point of the rotating arm assembly, and a cover plate installation structure is arranged on the rotating arm assembly. The device has the beneficial effects that the device is light and handy, the whole device is built-in, so that the device is convenient to use, time-saving and labor-saving to operate, the tasks of assembling and disassembling the manhole cover plate and replacing the gasket can be easily completed by only one person, a dragging system does not need to be provided externally, and the required operation space is small; the operation process is simple, manpower and material resources are saved, and the manhole cover plate is easy to install in place.

Description

Technical Field

[0001] This application belongs to the technical field of operation supporting for pressure vessels, and particularly relates to an internal transmission cover plate loading and unloading device. Background Art

[0002] For some pressure vessels, such as high-pressure feedwater heaters with a single-head tube sheet structure and other types of shell-and-tube heat exchangers, due to the small internal maintenance space in the tube sheet, the manhole structure on the tube sheet is usually designed as an internally pressurized self-tightening seal elliptical manhole structure where the manhole cover plate can be taken out from the manhole door of the tube sheet. Since the tube-side pressure is as high as 20 - 40 MPa, the designed thickness of the elliptical manhole cover plate reaches more than 100 mm and weighs more than one hundred kilograms. It is impossible to complete the installation and disassembly of the manhole cover plate by human strength alone.

[0003] In order to achieve the loading and unloading of the manhole cover plate, a traditional elliptical manhole cover plate loading and unloading fixture is generally used. It is a device whose main movement rotates around a certain fulcrum outside the manhole to load or unload the manhole cover plate. Although this device can achieve the loading and unloading of the manhole cover plate, it is bulky, has complex operations, requires a large operating space, cannot complete the loading and unloading task of the manhole cover plate by one person's strength, needs to rely on an external dragging system, and requires multiple people to cooperate to complete the loading and unloading task.

[0004] It is also possible to adopt a more advanced loading and unloading structure (Patent Invention 200910305719.5). This device can conveniently achieve the loading and unloading of the manhole cover plate in the horizontal operating state of horizontal equipment, but it is only applicable to horizontal equipment and cannot be generally applicable to the loading and unloading of manhole cover plates in various other position operating states. At the same time, this device has relatively more external components, occupies a large space volume, is not conducive to on-site operations, and is an external pulling and flipping operation method, which is not conducive to use in narrow spaces.

[0005] In order to solve the problems of loading and unloading of manhole cover plates in the vertical position operating state, inclined position operating state and other arbitrary position operating states, as well as the problems of facilitating on-site operations and optimizing device operations, it is necessary to invent a new structure to meet the actual operation needs. Content of the Utility Model

[0006] The object of the present application is to provide an internal transmission cover plate loading and unloading device, whose main movement is to displace along the axis of the manhole to load or unload the manhole cover plate. It is an improvement on the original invention patent "Loading and Unloading Device for Elliptical Manhole Cover of Pressure Vessel" (Patent No.: 200910305719.5). The main improvement lies in the transmission mode of the device's displacement movement along the axis of the manhole, changing the original manual pushing or dragging transmission mode to a lead screw transmission mode. At the same time, the overall structure is built-in, leaving space for convenient operation by personnel. And the transmission lever assembly flips the cover through internal pushing, reserving space in advance for the removal of the cover plate at the rear, and solving the problem that the original invention patent can only be used for horizontal position operation of horizontal vessels and cannot be used for other position operations, providing a solution for the loading and unloading of elliptical manhole covers in vertical position operation state, inclined position operation state and other arbitrary position operation states except the horizontal position operation state.

[0007] The object of the present application is achieved by the following technical solutions:

[0008] An internal transmission cover plate loading and unloading device, including a track bracket, on which there is an orifice mounting structure, and inside the track bracket there is a main sleeve assembly moving axially. The front part of the main sleeve assembly is hinged to the first hinge point of the swing arm assembly. Inside the main sleeve assembly there is a transmission link assembly moving axially. The front part of the transmission link assembly is hinged to a transition link, and the transition link is hinged to the second hinge point of the swing arm assembly. On the swing arm assembly there is a cover plate mounting structure.

[0009] Further, the first hinge point of the swing arm assembly is closer to the center of the swing arm assembly than the second hinge point.

[0010] Further, the swing arm assembly includes a swing arm and a swing arm base plate. There is a swing arm on the swing arm base plate. The first hinge point is set at the root of the swing arm, and the second hinge point is set at the bent end of the swing arm.

[0011] Further, the swing arm assembly further includes a swing arm bushing, a swing arm locking nut and a connecting sleeve as the orifice mounting structure. There is a swing arm bushing at the perforation of the swing arm base plate. There is a swing arm locking nut at the rear opening of the swing arm bushing. A connecting sleeve moving axially is sleeved on the swing arm bushing. The front edge of the connecting sleeve is clamped and matched with the rear edge of the swing arm bushing, and the connecting sleeve is connected to the swing arm locking nut.

[0012] Further, the swing arm assembly further includes a positioning member. There is a positioning member on the swing arm base plate. The positioning member includes a locking pin with an elastic tendency forward.

[0013] Further, the main sleeve assembly includes a connecting bushing, a lead screw, and a supporting ear plate. The lead screw is inserted into the track bracket 5, and the lead screw is in threaded engagement with a lead screw drive nut that rotates on the track bracket. The drive connection assembly is inserted inside the lead screw. The rear end of the lead screw is connected to the connecting bushing, and the connecting bushing acts on the drive link assembly. A supporting ear plate is provided inside the front end of the lead screw, and the supporting ear plate is hinged to the first hinge point of the swing arm assembly.

[0014] Further, the drive link assembly includes a drive link and a link drive nut. The drive link is inserted into the main sleeve assembly. The front end of the drive link is hinged to a transition link. The threaded section of the drive link is in threaded engagement with the link drive nut, and the link drive nut rotates and acts on the main sleeve assembly.

[0015] Further, a rotation fitting section is provided at the front end of the link drive nut. A drive locking nut located in front of the rotation fitting section is screwed onto the link drive nut. A first handle is provided at the rear end of the link drive nut.

[0016] Further, the track bracket includes a bracket body, a bracket sleeve, and a lead screw drive nut. A hole mounting structure is provided on the bracket body. A bracket sleeve is provided on the bracket body. The main sleeve assembly is inserted into the bracket sleeve. A rotating lead screw drive nut is provided on the bracket sleeve, and the lead screw drive nut is in threaded engagement with the main sleeve assembly.

[0017] Further, the track bracket further includes a rotating sleeve, a rolling bearing, and a second handle. The bracket sleeve is provided with a rotating sleeve through the rolling bearing. The rotating sleeve is connected to the lead screw drive nut. The front edge of the rotating sleeve is in clamping fit with the rolling bearing. The rear part of the rotating sleeve is in clamping fit with the lead screw drive nut through the second handle.

[0018] Further, the bracket body includes a bracket cross plate and a bracket base plate. Bolts serving as hole mounting structures are inserted through the bracket base plate. The bracket base plate is perpendicularly connected to the bracket cross plate. A connecting plate is provided between the bracket base plate and the bracket cross plate. The bracket sleeve is provided on the bracket cross plate.

[0019] Further, the front part of the bracket body is hinged to the front part of the bracket sleeve. An adjusting base plate is provided at the rear part of the bracket body. A rotating adjusting nut is provided on the adjusting base plate. The adjusting nut is in threaded engagement with the outer end of a stud. The inner end of the stud passes through a bent plate and is in threaded engagement with a height adjustment locking nut. The bent plate is provided at the rear part of the bracket sleeve.

[0020] Advantages of the present application:

[0021] 1. The device is lightweight and integrally built-in, making it convenient to use, time-saving and labor-saving in operation. It can easily complete the tasks of loading and unloading the manhole cover and replacing the gasket with only one person's effort, without the need for an external dragging system, and requires a small operating space.

[0022] 2. The operation process is simple, saving manpower and material resources, and it is easy to install and position the manhole cover.

[0023] 3. In the original invention patent, the manhole cover is sent into or taken out of the manhole door by a manual pushing or dragging transmission method, which is only applicable to the horizontal state operation. It is too laborious to be done manually for other position state operations; this application solves the problem that the original invention patent can only be used for the horizontal position operation of horizontal containers and is not applicable to other position operations, and provides a loading and unloading device for the screw-driven elliptical manhole cover that is generally applicable to all position states.

[0024] The main solution of this application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are the solutions that can be adopted and claimed in this application; and in this application, (each non-conflicting option) can also be freely combined between options and with other options. Those skilled in the art can understand that there are various combinations based on the prior art and common general knowledge after understanding this solution, all of which are the technical solutions to be protected in this application, and will not be exhaustively listed here. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of this application.

[0026] Figure 2 It is a schematic structural diagram of the swing arm assembly of this application.

[0027] Figure 3 It is a schematic structural diagram of the main sleeve assembly of this application.

[0028] Figure 4 It is a schematic structural diagram of the transmission connecting rod assembly of this application.

[0029] Figure 5 It is a schematic structural diagram of the track bracket of this application.

[0030] Figure 6 It is a schematic diagram of each connection position of this application.

[0031] Figure 7 It is a schematic diagram of the operation process of this application.

[0032] Figure 8 It is a schematic diagram of each operation position state of this application.

[0033] In the figure: 1. Swing arm assembly, 2. Main sleeve assembly, 3. Transmission connecting rod assembly, 4. Bolt, 5. Track bracket, 6. Shaft Ⅰ, 7. Shaft Ⅱ, 8. Transition connecting rod, 9. Key; 1-1. Swing arm, 1-2 Swing arm base plate, 1-3. Swing arm bushing, 1-4. Swing arm locking nut, 1-5. Connecting sleeve, 1-6. Positioning member, 1-6-1. Lock pin, 1-6-2. Pull ring; 2-1. Connecting bushing, 2-2. Lead screw, 2-3. Support ear plate; 3-1. Transmission connecting rod, 3-2. Transmission locking nut, 3-3. Link transmission screw sleeve, 3-4. First handle; 5-1. Bracket sleeve, 5-2. Rotating sleeve, 5-3. Rolling bearing, 5-4. Connecting plate, 5-5. Lead screw transmission screw sleeve, 5-6. Second handle, 5-7. Limit pin, 5-8. Height adjustment locking nut, 5-9. Stud, 5-10. Bent plate, 5-11. Adjusting nut, 5-12. Adjusting base plate, 5-13. Bracket cross plate, 5-14. Adjusting ear plate, 5-15. Bracket base plate, 5-16. Shaft Ⅲ; 100. Manhole nipple, 200. Cover plate, 201. Core shaft. Detailed implementation mode

[0034] The present application will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0035] Refer to Figures 1 to 8 As shown, an internal transmission cover plate loading and unloading device includes a swing arm assembly 1, a main sleeve assembly 2, a transmission connecting rod assembly 3, a bolt 4, a track bracket 5, a shaft Ⅰ 6, a shaft Ⅱ 7, a transition connecting rod 8 and a key 9.

[0036] The track bracket 5 is a basic framework for supporting the operation of the entire device. The track bracket 5 is provided with an orifice mounting structure to fix the track bracket 5 on the manhole nipple 100. The swing arm assembly 1 is provided with a cover plate mounting structure to directly fix the swing arm assembly 1 on the cover plate 200 and realize the rotation of the cover plate 200 along the axial line as the axis. The swing arm assembly 1 is used for the transition of the acting force, and the acting forces of the main sleeve assembly 2 and the transmission connecting rod assembly 3 act on the swing arm assembly 2 first. Through the action of the swing arm assembly 2, the cover plate 200 is driven to move axially or flip together.

[0037] The main sleeve assembly 2 that moves axially is arranged inside the track bracket 5. The front part of the main sleeve assembly 2 is hinged to the first hinge point of the swing arm assembly 1. The axial movement of the main sleeve assembly 2 is used to drive the swing arm assembly 1, the transmission connecting rod assembly 3 and the cover plate 200 to move axially together, so as to realize the adjustment of the front and rear positions of the cover plate 200. At the same time, the swing arm assembly 1 and the cover plate 200 can also flip along the first hinge point.

[0038] Inside the main sleeve assembly 2, there is a drive link assembly 3 that moves axially. The front part of the drive link assembly 3 is hinged to the transition link 8, and the transition link 8 is hinged to the second hinge point of the swing arm assembly 1. The axial movement of the drive link assembly 3 is used to drive the transition link 8 to move. The transition link 8 moves relative to the main sleeve assembly 2, and the transition link 8 acts on the second hinge point at a position different from the first hinge point, so as to be able to provide a moment for the swing arm assembly 1 and realize the flipping of the swing arm assembly 1 and the cover plate 200.

[0039] The cover plate 200 is oval. In order to take out the disassembled cover plate 200 from the manhole, it is necessary to first rotate the cover plate 200 90° along the axial direction (the axis of the mandrel) as the axis, and then flip it 90° along the horizontal axis perpendicular to the axial direction (the axis of the first hinge point), so as to take out the oval cover plate 200 in a vertical state from the oval manhole. During the flipping process, since the position near the outer side of the hole (the position of the inner wall) is occupied by each component, it is preferably that the flipping direction of the cover plate 200 is to flip backward at the center, so that the flipped cover plate 200 is located at the center of the manhole.

[0040] The first hinge point of the swing arm assembly 1 is closer to the center of the swing arm assembly 1 than the second hinge point. Then, only when the drive link assembly 3 moves forward to push the transition link 8 can the flipping of the swing arm assembly 1 and the cover plate 200 be realized. At this time, the drive link assembly 3 moves forward relative to the main sleeve assembly 2, and the overall length (the rear end) of the device is shortened due to the factor of the drive link assembly 3. When taking out the cover plate 200 subsequently, the occupation of the device space can be reduced, so as to be applicable to a narrower space.

[0041] The swing arm assembly 1 includes a swing arm 1-1, a swing arm base plate 1-2, a swing arm bushing 1-3, a swing arm locking nut 1-4, a connecting sleeve 1-5 and a positioning member 1-6. The swing arm base plate 1-2 is a flat plate structure. The front end face can be attached to the cover plate 200, and the rear end face is used for the placement of other structures. A swing arm 1-1 is welded on the outer side of the rear end face of the swing arm base plate 1-2. The swing arm 1-1 is a bent arm that bends outward. The first hinge point is provided at the root of the swing arm 1-1, and the second hinge point is provided at the head of the bent arm of the swing arm 1-1.

[0042] The swing arm bushing 1-3, the swing arm locking nut 1-4 and the connecting sleeve 1-5 are used as the hole installation structure. The swing arm bushing 1-3 is welded at the central perforation of the rear end face of the swing arm base plate 1-2. The swing arm locking nut 1-4 is provided at the rear opening of the swing arm bushing 1-3. When connecting and fixing the cover plate 200, the mandrel 201 of the cover plate 200 is inserted into the swing arm bushing 1-3, and then tightened on the mandrel 201 through the thread of the swing arm locking nut 1-4 to realize the fixation of the two. At this time, the cover plate 200 can rotate along the mandrel 201.

[0043] A connecting sleeve 1-5 that moves axially is sleeved on the swivel arm bushing 1-3. The front edge of the connecting sleeve 1-5 is clamped and fitted with the rear edge of the swivel arm bushing 1-3. The connecting sleeve 1-5 is welded to the swivel arm locking nut 1-4. Thus, due to the limiting effect of the connecting sleeve 1-5, the swivel arm locking nut 1-4 cannot be detached from the bushing, but it can rotate axially around its own axis, without affecting the function of screwing or unscrewing.

[0044] A positioning member 1-6 is provided on the rear end face of the swivel arm base plate 1-2. The swivel arm 1-1 and the positioning member 1-6 are arranged relatively to avoid mutual interference. The positioning member 1-6 includes a locking pin 1-6-1 that has an elastic tendency forward. After the cover plate 200 rotates 90°, the locking pin 1-6-1 is snapped into the groove of the cover plate 200 to achieve the positioning of the cover plate 200 after the first rotation. A pull ring 1-6-2 is provided at the rear end of the locking pin 1-6-1, and the pull ring 1-6-2 facilitates pulling the locking pin 1-6-1.

[0045] The main sleeve assembly 2 includes a connecting sleeve 2-1, a lead screw 2-2, and a support ear plate 2-3. The lead screw 2-2 is inserted into the bracket sleeve 5-1 of the track bracket 5, and a key 9 is used to restrict the rotation of the lead screw 2-2 in the sleeve. The lead screw 2-2 is in threaded cooperation with the lead screw drive nut 5-5 that rotates on the track bracket 5. By rotating the lead screw drive nut 5-5 axially around its own axis, the forward or backward movement of the lead screw 2-2 is realized, completing the removal and installation actions of the cover plate 200, replacing manual or dragging actions with lead screw drive, and reducing the operation difficulty. The drive connection assembly 3 is inserted into the interior of the lead screw 2-2 to realize the internal placement of the device structure, avoiding the situation that the drive link assembly is located at the hole center and affecting the operation of the swivel arm assembly 1 or the cover plate 200.

[0046] The rear end of the lead screw 2-2 is welded to the connecting sleeve 2-1, and the connecting sleeve 2-1 acts with the drive link assembly 3, that is, the drive link assembly 3 is based on the connecting sleeve 2-1 to realize its own forward or backward movement. A support ear plate 2-3 is welded to the inner side of the front end of the lead screw 2-2, and the support ear plate 2-3 is hinged to the first hinge point of the swivel arm 1-1 through shaft Ⅰ6. At the same time, a notch is also provided on the inner side of the front end of the lead screw 2-2 so that the swivel arm 1-1 can extend into the interior of the lead screw 2-2.

[0047] The drive link assembly 3 includes a drive link 3-1, a drive locking nut 3-2, a link drive nut 3-3, and a first handle 3-4. The drive link 3-1 is inserted into the lead screw 2-2 of the main sleeve assembly 2. The front end ear plate of the drive link 3-1 is hinged to the transition link 8 through shaft Ⅱ7, and the transition link 8 is hinged to the second hinge point of the swivel arm 1-1 through shaft Ⅱ7. Then, when the drive link 3-1 moves forward and backward, it acts on the swivel arm 1-1 through the transition link 8.

[0048] The threaded section of the transmission connecting rod 3-1 is in threaded fit with the connecting rod transmission screw sleeve 3-3. The rotation of the connecting rod transmission screw sleeve 3-3 acts on the connecting shaft sleeve 2-1 of the main sleeve assembly 2. By rotating the connecting rod transmission screw sleeve 3-3 along the axial direction as the axis, the transmission connecting rod 3-1 can be extended or retracted relative to the lead screw 2-2 by using the thread, thus completing the flipping action of the cover plate 200. The front end of the connecting rod transmission screw sleeve 3-3 is provided with a rotation fit section. A transmission locking nut 3-2 is screwed on the connecting rod transmission screw sleeve 3-3 in front of the rotation fit section. The transmission locking nut 3-2 is used to realize the axial limit of the connecting rod transmission screw sleeve 3-3 on the connecting shaft sleeve 2-1. At the same time, the rotation fit section is located in the opening of the connecting shaft sleeve 2-1 to realize the rotation of the connecting rod transmission screw sleeve 3-3 itself. A first handle 3-4 is welded to the rear end of the connecting rod transmission screw sleeve 3-3, which is convenient for operating the first handle 3-4 to realize the rotation of the connecting rod transmission screw sleeve 3-3.

[0049] The track bracket 5 includes a bracket main body, a bracket sleeve 5-1, a rotating sleeve 5-2, a rolling bearing 5-3, a lead screw transmission screw sleeve 5-5 and a second handle 5-6. The bracket main body is provided with a hole mounting structure to realize its own fixation on the manhole nipple 100, and the bracket main body is also used for the placement of other structures. A bracket sleeve 5-1 is provided on the bracket main body, and the lead screw 2-2 of the main sleeve assembly 2 is arranged in the bracket sleeve 5-1. A rotating lead screw transmission screw sleeve 5-5 is provided on the bracket sleeve 5-1, and the lead screw transmission screw sleeve 5-5 is in threaded fit with the main sleeve assembly 2. A notch is opened on the inner side of the front end of the bracket sleeve 5-1 so that the cantilever 1-1 can extend into the sleeve.

[0050] The bracket sleeve 5-1 is provided with a rotating sleeve 5-2 through a rolling bearing 5-3. The rotating sleeve 5-2 can rotate along the axial direction as the axis. The rear end of the rotating sleeve 5-2 is welded to the lead screw transmission screw sleeve 5-5, so as to realize the rotational placement of the lead screw transmission screw sleeve 5-5 on the bracket sleeve 5-1. The front edge of the rotating sleeve 5-2 is in clamping fit with the rolling bearing 5-3, and the rear part of the rotating sleeve 5-2 is in clamping fit with the lead screw transmission screw sleeve 5-5 through the second handle 5-6, realizing the axial limit of the rotating sleeve 5-2 and the lead screw transmission screw sleeve 5-5. The second handle 5-6 is convenient for operating the rotation of the lead screw transmission screw sleeve 5-5. A limit pin 5-7 is also clamped between the rear part of the rotating sleeve 5-2 and the lead screw transmission screw sleeve 5-5. The limit pin 5-7 does not protrude from the outer end face of the rotating sleeve 5-2, reserving space for the disassembly and assembly of the cover plate 200.

[0051] The support body includes a connecting plate 5-4, a height-adjusting lock nut 5-8, a stud 5-9, a bent plate 5-10, an adjusting nut 5-11, an adjusting base plate 5-12, a support cross plate 5-13, an adjusting ear plate 5-14, and a support base plate 5-15. Both the support cross plate 5-13 and the support base plate 5-15 are flat plates. The front end face of the support base plate 5-15 is fitted to the manhole nipple 100. A bolt 4 serving as an orifice mounting structure is passed through the support base plate 5-15 to fix the support body to the manhole nipple. The support base plate 5-15 is perpendicularly welded to the support cross plate 5-13 to form a firm integral body. A connecting plate 5-4 is welded between the support base plate 5-15 and the support cross plate 5-13 to strengthen the overall structure.

[0052] A support sleeve 5-1 is provided on the support cross plate 5-13. The front part of the support cross plate 5-13 is hinged to the adjusting ear plate 5-14 on the outer side of the front part of the support sleeve 5-1 through a shaft III 5-16. The pitching adjustment of the support sleeve 5-1 can change its own level. The rear part of the support cross plate 5-13 is welded with an adjusting base plate 5-12. A rotatable adjusting nut 5-11 is provided on the adjusting base plate 5-12. The adjusting nut 5-11 is in threaded cooperation with the outer end of the stud 5-9. The inner end of the stud 5-9 passes through the bent plate 5-10 and is in threaded cooperation with the height-adjusting lock nut 5-8. The bent plate 5-10 is welded to the rear part of the support sleeve 5-1. Specifically, by rotating the adjusting nut 5-11, the height of the rear end of the support sleeve 5-1 can be changed, and its front end also rotates relative to the shaft III, thereby adjusting its own level.

[0053] Reference Figure 7 As shown, when performing the loading and unloading operation of the elliptical manhole cover, first connect and fix the track support 5 to the manhole nipple through the bolt 4, then rotate the lead screw to drive the screw sleeve to move the main sleeve assembly 2, the swivel arm assembly 1, and the transmission link assembly 3, and let the core shaft of the manhole cover be sleeved into the bushing of the swivel arm assembly 1 and locked with the swivel arm lock nut, thus completing the clamping work of the manhole cover.

[0054] The action process for disassembling the manhole cover is as follows:

[0055] Action 1: Hold the second handles extending from both sides of the lead screw drive screw sleeve with both hands and rotate the lead screw drive screw sleeve clockwise to move the main sleeve assembly in the direction of the arrow, so that the swivel arm, the main sleeve, the transmission link assembly, and the manhole cover move horizontally to the left by a certain distance together, and reach into the manhole door to rotate the manhole cover 90° in the vertical plane and position it with the positioning member.

[0056] Action 2: Hold the first handle of the connecting rod transmission screw sleeve with both hands, and rotate the connecting rod transmission screw sleeve clockwise, so that the transmission connecting rod moves leftward in the connecting rod transmission screw sleeve, pushing the swing arm assembly to rotate clockwise around the rotating shaft Ⅰ, and driving the manhole cover plate to change from the vertical position to the horizontal position. Only when the manhole cover plate changes to the horizontal position or is close to the horizontal position can the manhole cover plate pass through the manhole door smoothly.

[0057] Action 3: Hold the second handles extending from both sides of the lead screw transmission screw sleeve with both hands, and rotate the lead screw transmission screw sleeve counterclockwise, move the main sleeve assembly along the arrow direction, so that the swing arm, the main sleeve, the transmission connecting rod assembly and the manhole cover plate move horizontally to the right together until they move out of the manhole door.

[0058] Action 4: Loosen the swing arm locking nut and remove the manhole cover plate. For convenient operation, Action 2 can be performed in the reverse direction to lift the manhole cover by a certain angle, which is convenient for screwing the locking nut.

[0059] To realize the action process of installing the manhole cover plate, just operate according to the reverse order and action direction of the above actions, and the in-place installation of the manhole cover plate can be successfully completed.

[0060] Main motion characteristics: The main sleeve assembly makes a displacement motion along the axis of the manhole under the support of the track bracket, and its function is to push the manhole cover plate into or pull it out of the manhole door. The displacement motion adopts a screw drive method, which saves manpower and enables this device to be generally applicable to various position states for operation. Secondary motion characteristics: The swing arm assembly makes a rotational motion around the rotating shaft Ⅰ under the traction of the transmission connecting rod assembly, and its function is to change the position state and the center height of the manhole cover plate, so that the manhole cover plate changes between the vertical and horizontal position states, which is convenient for taking out and installing the manhole cover plate in place.

[0061] The basic example of the present application and its various further selection examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in the present application. In the solution of the present application, each selection example can be arbitrarily combined with any basic example and selection example.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A built-in transmission cover loading and unloading device, comprising a track bracket (5), the track bracket (5) being provided with an orifice mounting structure, characterized in that: The rail bracket (5) is provided with a main sleeve assembly (2) that moves along the axial direction, the front part of the main sleeve assembly (2) is hinged to the first hinge point of the swing arm assembly (1), the main sleeve assembly (2) is provided with a transmission connecting rod assembly (3) that moves along the axial direction, the front part of the transmission connecting rod assembly (3) is hinged to the transition connecting rod (8), the transition connecting rod (8) is hinged to the second hinge point of the swing arm assembly (1), and a cover plate mounting structure is provided on the swing arm assembly (1).

2. The built-in transmission cover loading and unloading device according to claim 1, characterized in that: The first hinge point of the rotating arm assembly (1) is closer to the center of the rotating arm assembly (1) than the second hinge point.

3. The built-in transmission cover loading and unloading device according to claim 1 or 2, characterized in that: The rotating arm assembly (1) comprises a rotating arm (1-1) and a rotating arm base plate (1-2); the rotating arm (1-1) is arranged on the rotating arm base plate (1-2); a first hinge point is arranged at the arm root of the rotating arm (1-1); and a second hinge point is arranged at the bent arm head of the rotating arm (1-1).

4. The built-in transmission cover loading and unloading device according to claim 3, characterized in that: The swing arm assembly (1) further comprises a swing arm sleeve (1-3) as an orifice mounting structure, a swing arm locking nut (1-4) and a connecting sleeve (1-5); a swing arm sleeve (1-3) is provided at a perforation of the swing arm base plate (1-2); a swing arm locking nut (1-4) is provided at a rear opening of the swing arm sleeve (1-3); a connecting sleeve (1-5) movable in the axial direction is sleeved on the swing arm sleeve (1-3); a front edge of the connecting sleeve (1-5) is engaged with a rear edge of the swing arm sleeve (1-3); and the connecting sleeve (1-5) is connected to the swing arm locking nut (1-4); The swing arm assembly (1) further comprises a positioning component (1-6). The swing arm base plate (1-2) is provided with the positioning component (1-6). The positioning component (1-6) comprises a locking pin (1-6-1) with an elastic tendency to move forward.

5. The built-in transmission cover loading and unloading device according to claim 1, characterized in that: The main sleeve assembly (2) comprises a connecting sleeve (2-1), a lead screw (2-2) and a supporting ear plate (2-3); the lead screw (2-2) is inserted into the track bracket (5); the lead screw (2-2) is threadedly matched with a lead screw transmission screw sleeve (5-5) rotating on the track bracket (5); the transmission connection assembly (3) is inserted into the lead screw (2-2); the rear end of the lead screw (2-2) is connected to the connecting sleeve (2-1); the connecting sleeve (2-1) and the transmission connecting rod assembly (3) are interacted; a supporting ear plate (2-3) is arranged on the inner side of the front end of the lead screw (2-2); the supporting ear plate (2-3) is hinged to the first hinge point of the rotating arm assembly (1).

6. The built-in transmission cover loading and unloading device according to claim 1 or 5, characterized in that: The transmission connecting rod assembly (3) comprises a transmission connecting rod (3-1) and a connecting rod transmission screw sleeve (3-3). The transmission connecting rod (3-1) is inserted into the main sleeve assembly (2). The front end of the transmission connecting rod (3-1) is hinged to the transition connecting rod (8). The threaded section of the transmission connecting rod (3-1) is threadedly matched with the connecting rod transmission screw sleeve (3-3). The connecting rod transmission screw sleeve (3-3) rotates on the main sleeve assembly (2).

7. The built-in transmission cover plate loading and unloading device according to claim 6, characterized in that: The front end of the connecting rod transmission screw sleeve (3-3) is provided with a rotational fitting section, a transmission locking nut (3-2) located in front of the rotational fitting section is threadedly connected to the connecting rod transmission screw sleeve (3-3), and the rear end of the connecting rod transmission screw sleeve (3-3) is provided with a first handle (3-4).

8. The built-in transmission cover plate loading and unloading device according to claim 1 or 5, characterized in that: The rail bracket (5) comprises a bracket body, a bracket sleeve (5-1) and a screw transmission screw sleeve (5-5); the bracket body is provided with an orifice mounting structure; the bracket body is provided with a bracket sleeve (5-1); the main sleeve assembly (2) is inserted into the bracket sleeve (5-1); the bracket sleeve (5-1) is provided with a rotatable screw transmission screw sleeve (5-5); the screw transmission screw sleeve (5-5) is threadedly matched with the main sleeve assembly (2).

9. The built-in transmission cover plate loading and unloading device according to claim 8, characterized in that: The track bracket (5) further comprises a rotating sleeve (5-2), a rolling bearing (5-3) and a second handle (5-6); the bracket sleeve (5-1) is provided with a rotating sleeve (5-2) via the rolling bearing (5-3); the rotating sleeve (5-2) is connected to the screw drive screw sleeve (5-5); the front edge of the rotating sleeve (5-2) is engaged with the rolling bearing (5-3); the rear portion of the rotating sleeve (5-2) is engaged with the screw drive screw sleeve (5-5) via the second handle (5-6).

10. The built-in transmission cover plate loading and unloading device according to claim 8, characterized in that: The support body comprises a support cross plate (5-13) and a support base plate (5-15), a bolt (4) serving as an orifice mounting structure is passed through the support base plate (5-15), the support base plate (5-15) is vertically connected to the support cross plate (5-13), a connecting plate (5-4) is provided between the support base plate (5-15) and the support cross plate (5-13), and a support sleeve (5-1) is provided on the support cross plate (5-13); The front part of the bracket body is hinged with the front part of the bracket sleeve (5-1), and the rear part of the bracket body is provided with an adjustment base plate (5-12). The adjustment base plate (5-12) is provided with a rotatable adjustment nut (5-11). The adjustment nut (5-11) is threadedly matched with the outer end of the stud (5-9). The inner end of the stud (5-9) passes through the bent plate (5-10) and is threadedly matched with the height adjustment locking nut (5-8). The bent plate (5-10) is provided at the rear part of the bracket sleeve (5-1).

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