Heavy hammer balance type large-span arbitrary long equipment hoisting port

Abstract

A heavy hammer balance type large-span arbitrary length equipment hoisting port comprises a frame, a plurality of sets of split cover plates and a plurality of sets of cover plate support beam mechanisms. The split cover plate comprises a first cover plate and a second cover plate, and the first cover plate and the second cover plate are respectively rotationally connected with a first side and a second side of the frame. The cover plate support beam mechanism comprises a support beam and a support part, and the support part is arranged on the first side of the frame. The support beam comprises a fixed beam and a movable beam, and the movable beam is located in front of the fixed beam; one end of the fixed beam is connected with the second side of the frame and is provided with a pair of first guide rails; one end of the movable beam is connected with a mounting bracket mounted on the second side of the frame in a rotatable manner up and down, and the movable beam is provided with a pair of second guide rails. The second cover plate is a folding cover plate, when the second cover plate is rotated upward and is switched from an unfolded state to a folded state, the rollers on both sides of the second cover plate are moved from the guide rails of the movable beam to the guide rails of the fixed beam. The cover plate of the present application has strong load bearing capacity, and is convenient for hoisting objects into and out of the hoisting port.

Description

TECHNICAL FIELD

[0001] The present application relates to a hoistway for a building. BACKGROUND

[0002] A hoistway is usually provided on a building floor of a power plant or the like for hoisting in or out of equipment, and a hoistway is provided at the hoistway. The conventional hoistway is composed of a frame, a cover plate, a wavy guardrail and a cover plate opening and closing mechanism, and when not in use, the hoistway is covered with a cover plate, and when the hoistway is needed, the cover plate is opened by the cover plate opening and closing mechanism by the operator, and the wavy guardrail is erected, thereby forming a stable and safe fence structure around the entire hoistway.

[0003] For a long hoistway (e.g. the length of the hoistway is greater than 8 meters), the hoistway is provided with multiple sets of split cover plates along the length direction of the hoistway. In order to meet the load bearing requirements of the cover plates, each two adjacent sets of split cover plates are effectively supported by a cover plate support beam mechanism, please refer to the patent application No. 202220482132.2 filed on March 7, 2022. The hoistway uses the cover plate support beam mechanism to effectively support the cover plates of the long hoistway, thereby greatly improving the load bearing capacity of the cover plates, but it still has certain deficiencies for the hoistway with large span (e.g. the width of the hoistway is greater than 4 meters), the main reason is that the cover plates of the hoistway are composed of a whole plate body alone and cannot be folded, when the size of the hoistway is large, the size of the cover plate will also be correspondingly large, resulting in a relatively high height of the cover plate when it is erected, not only causing the workers to have difficulty in observing the internal working conditions of the hoistway from the periphery of the cover plate, but also affecting the hoisting and transferring of the objects, and even causing the cover plate to collide with the hoisted objects, thereby affecting the operation safety. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a hoistway suitable for a long and large-span hoistway, which has strong cover plate load bearing capacity and is convenient for hoisting objects into and out of the hoistway, easy to operate and safe to use.

[0005] An embodiment of the present invention provides a lifting port, comprising a frame, multiple sets of split-type cover plates, and several sets of cover plate support beam mechanisms. The frame has a first side and a second side facing each other. Each set of split-type cover plates includes a first cover plate and a second cover plate, each cover plate having a first end and a second end facing each other. The first end of the first cover plate is rotatably connected to the first side of the frame, and the first end of the second cover plate is rotatably connected to the second side of the frame. Each set of cover plate support beam mechanisms includes a support beam and a support portion. The support beam supports two adjacent sets of split-type cover plates, and the support portion is located on the first side of the frame. The support beam includes a fixed beam and a movable beam, with the movable beam located directly in front of the fixed beam. One end of the fixed beam is connected to the second side of the frame, and the fixed beam has a pair of first guide rails extending along the longitudinal direction of the fixed beam. One end of the movable beam is rotatably connected to a mounting bracket installed on the second side of the frame to switch between a cover plate support position and a retracted position. When the movable beam is in the cover plate support position, the other end of the movable beam presses against the support portion. When the mounting bracket rotates upward, the movable beam switches from the cover plate support position to the retracted position. The movable beam is equipped with a pair of second guide rails extending longitudinally along the movable beam. The first cover plate can switch between a closed position and an open position. When the first cover plate is in the closed position, it is supported on the movable beams located on both sides of the first cover plate. When the first end of the first cover plate rotates upward relative to the first side of the frame, the first cover plate switches from the closed position to the open position. The second cover plate is a folding cover plate with an unfolded state and a folded state. Rollers are provided on both sides of the second end of the second cover plate. When the second cover plate is in the unfolded state, it is supported on the fixed beams and movable beams located on both sides of the second cover plate. The rollers on both sides of the second cover plate stop on the guide rails of the movable beams located on both sides of the second cover plate. When the first end of the second cover plate rotates upward relative to the second side of the frame, the second cover plate switches from the unfolded state to the folded state. The rollers on both sides of the second cover plate move from the guide rails of the movable beams located on both sides of the second cover plate to the guide rails of the fixed beams located on both sides of the second cover plate.

[0006] This invention has at least the following advantages and features:

[0007] 1. The split cover plate of the present invention can obtain strong support from the cover plate support beam mechanism when closed, so the cover plate of the lifting port can withstand a large load;

[0008] 2. The embodiments of the present invention use a foldable cover plate. Compared with all cover plates that use a non-foldable cover plate structure, the height of the cover plate after being erected is smaller. This not only makes it easier for workers to observe the internal working conditions of the hoisting opening from the outside of the cover plate, but also facilitates the lifting and transfer of objects, reducing the probability of the cover plate colliding with the hoisted object.

[0009] 3. The folding cover plate of the embodiment of the present application can be supported by the guide rail in both the unfolded state and the folded state, and is safe to use.

[0010] 4. After the split cover plate is opened, the movable beam can be turned upward to the retracted position, without affecting the lifting of the object from the lifting opening. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A top view of a long-span lifting opening according to an embodiment of the present application is shown, in which the movable beams of the cover plate support beam mechanisms are in the cover plate support position, and all the split cover plates are in the closed state.

[0012] Figure 2 A schematic view of a set of split cover plates according to an embodiment of the present application is shown, in which the first cover plate is in the closed position, the second cover plate is in the unfolded state, and the movable beam is in the cover plate support position.

[0013] Figure 3 A sectional view of a movable beam according to an embodiment of the present application is shown, in which the movable beam is in the cover plate support position.

[0014] Figure 4 And Figure 5 Schematic views of a single movable beam according to an embodiment of the present application are shown from different angles, respectively, in the retracted position.

[0015] Figure 6 A schematic view of all movable beams according to an embodiment of the present application is shown in the retracted position.

[0016] Figure 7 And Figure 8 Schematic views of a latch according to an embodiment of the present application are shown from different angles, respectively, when it is locked to the cover plate.

[0017] Figure 9 And Figure 10 Schematic views of a latch according to an embodiment of the present application are shown from different angles, respectively, when it is locked to the cover plate. DETAILED DESCRIPTION

[0018] The present application will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0019] Please refer to Figures 1 to Figure 6 The lifting opening according to an embodiment of the present application includes a frame 1, a plurality of sets of split cover plates, a plurality of sets of cover plate support beam mechanisms, and two sets of retractable guardrails 5.

[0020] The frame 1 is rectangular, having a first side 11, a second side 12, a third side 13 and a fourth side 14. The first side 11 and the second side 12 are opposite to each other, and the third side 13 and the fourth side 14 are opposite to each other. The frame 1 is installed around the hoisting hole of the building floor 6.

[0021] Figure 1 Three sets of split cover plates are shown in the middle. Each set of split cover plates includes a first cover plate 21 and a second cover plate 22, each cover plate having opposite first and second ends, the first end of the first cover plate 21 being connected to the first side 11 of the frame 1 in a vertically rotatable manner, and the first end of the second cover plate 22 being connected to the second side 12 of the frame 1 in a vertically rotatable manner. In a specific embodiment, the first end of the first cover plate 21 and the first end of the second cover plate 22 are connected to the first side 11 of the frame 1 and the second side 12 of the frame 1 respectively through a plurality of gear transmission mechanisms 8, each gear transmission mechanism 8 being a gravity balance type gear transmission mechanism having an upper balance arm 85 and a lower gravity arm 86 with a counterweight 87. The specific structure of the gear transmission mechanism is prior art, which has been disclosed in some patent applications (for example, the patent application with the application date of April 27, 2022 and the application number of 202221073578.6), which will not be described here.

[0022] The bottoms of the two sets of undulating guardrails 5 are connected to the third side 13 and the fourth side 14 of the frame 1 respectively. When the plurality of sets of split cover plates and the two sets of undulating guardrails 5 are all erected, a fence structure can be formed. Specifically, the undulating guardrails 5 are detachably connected to the erected cover plates through the first movable bolt 51 when they are erected.

[0023] The meaning of "several sets" is one or more sets. The number of cover plate support beam mechanisms is related to the number of split cover plates. When the number of split cover plates is two sets, only one set of cover plate support beam mechanisms is needed, when the number of split cover plates is three sets, two sets of cover plate support beam mechanisms are needed, and so on.

[0024] Each set of cover plate support beam mechanisms includes a support beam 3a for supporting two adjacent sets of split cover plates and a support part 3b provided on the first side 11 of the frame 1, which can be a corbel welded to the frame 1. The support beam 3a includes a fixed beam 31 and a movable beam 32 located directly in front of the fixed beam 31.

[0025] One end of the fixed beam 31 is connected to the second side 12 of the frame 1, and the fixed beam 31 is provided with a pair of first guide rails 33 extending in the longitudinal direction of the fixed beam; one end of the movable beam 32 is connected to the mounting bracket 4 mounted on the second side 12 of the frame 1 and can rotate up and down to switch between the cover plate supporting position and the retracted position, and when the movable beam 32 is in the cover plate supporting position, the other end of the movable beam 32 is pressed on the support part 3b, and when the one end of the movable beam 32 rotates upward relative to the mounting bracket 4, the movable beam 32 is switched from the cover plate supporting position to the retracted position. The movable beam 32 is provided with a pair of second guide rails 34 extending in the longitudinal direction of the movable beam, and the top surface of the second guide rail 34 is flush with the top surface of the first guide rail 33. Preferably, when the movable beam 32 is in the cover plate supporting position, the gap g between the one end of the movable beam 32 and the other end of the fixed beam 31 is 2mm-5mm.

[0026] In this embodiment, the fixed beam 31 and the movable beam 32 have the same structure and both include an I-beam, which will be described below only with the movable beam as an example. Please refer to Figure 3 The I-beam 35 includes a top plate 351, a bottom plate 352 and a web 353, the top end and the bottom end of the web 353 are connected to the top plate 351 and the bottom plate 352 respectively; the top surface of the top plate 351 is used to support the cover plate, and the two sides of the web 353 are respectively provided with a guide rail support structure to support the second guide rail 34. The guide rail support structure includes a plurality of L-shaped rib plates 36, which are distributed along the length direction of the second guide rail, each L-shaped rib plate 36 is arranged between the top plate 351 and the bottom plate 352 of the I-beam and is welded to the top plate 351, the bottom plate 352 and the web 353 of the I-beam respectively. At least a part of the horizontal edge part 361 of each L-shaped rib plate 36 extends to the outside of the I-beam 35, and the second guide rail 34 is connected to the horizontal edge part 361 of the plurality of L-shaped rib plates. Optionally, each first guide rail 33 and each second guide rail 34 is composed of an angle steel.

[0027] In this embodiment, the mounting bracket 4 includes a pair of gear transmission racks 4a, which are respectively located on the two sides of the movable beam 32. Each gear transmission rack 4a includes a gear bracket 40, a first gear shaft 41, a second gear shaft 42, a first gear 43, a second gear 44, an upper balance arm 45 and a lower weight arm 46.

[0028] The gear support 40 is connected to the second side of the frame 12, and the connection manner includes but is not limited to bolt connection and the like. The first gear shaft 41 and the second gear shaft 42 are respectively arranged in the gear support 40, and the first gear shaft 41 is located above the second gear shaft 42. The first gear 43 and the second gear 44 are respectively sleeved outside the first gear shaft 41 and the second gear shaft 42, and the first gear 43 and the second gear 44 are engaged with each other. One end of the upper balance arm 45 is connected with the first gear 43 to rotate synchronously with the first gear 43, and the other end of the upper balance arm 45 is connected with the movable beam 32 (for example, in a bolt connection manner). One end of the lower weight arm 46 is connected with the second gear 44 to rotate synchronously with the second gear 44, and the other end of the lower weight arm 46 is provided with the counterweight 47. Among them, the first gear shafts 41 of the pair of gear transmission frames 4a are connected into one, forming a through shaft 41a, and the through shaft 41a penetrates the upper balance arms 45 and the movable beams 32 of the pair of gear transmission frames.

[0029] In a specific embodiment, the upper balance arm 45 and the lower weight arm 46 are respectively composed of a pair of first connecting plates 451 and a pair of second connecting plates 461, and the first gear 43 is located between the pair of first connecting plates 451, and the two sides of the first gear 43 are respectively connected with the pair of connecting plates 451.

[0030] In the embodiment, the first cover plate 21 is a non-folding cover plate, which can be switched between a closed position and an open position. When the first cover plate 21 is in the closed position, the first cover plate 21 is supported on the movable beams 32 located on both sides of the first cover plate. When the first end of the first cover plate 21 rotates upward relative to the first side 11 of the frame 1, the first cover plate 21 is switched from the closed position to the open position.

[0031] In the embodiment, the second cover plate 22 is a folding cover plate, which has an unfolded state and a folded state. In the example shown in the figure, the second cover plate 22 is a two-fold cover plate, which is connected by two sub-cover plates 221, and the adjacent ends of the two sub-cover plates 221 are rotatably connected with each other through a plurality of synchronous rotation connection assemblies 23. For the specific structure of the synchronous rotation connection assembly 23, please refer to the patent application No. 202221073578.6, entitled "Heavy Hammer Balanced Folding Labor-saving Cover Plate Mechanism and Hoisting Port". In other embodiments, the second cover plate 22 can also be connected by more than three sub-cover plates 221 through the above-mentioned synchronous rotation connection assembly 23.

[0032] Two sides of the second end of the second cover plate 22 are respectively provided with a roller 24; when the second cover plate 22 is in the unfolded state, the second cover plate 22 is supported on the fixed beam 31 and the movable beam 32 located on both sides of the second cover plate, and the rollers 24 on both sides of the second cover plate 22 are respectively stopped on the second guide rail 34 of the movable beam 32 located on both sides of the second cover plate; when the first end of the second cover plate 22 is turned upward relative to the second side 12 of the frame 1, the second cover plate 22 is switched from the unfolded state to the folded state, and the rollers 24 on both sides of the second cover plate 22 are moved from the second guide rail 34 of the movable beam 32 located on both sides of the second cover plate to the first guide rail 33 of the fixed beam 31 located on both sides of the second cover plate.

[0033] The folding cover plate is adopted in the embodiment, and compared with the structure that all cover plates are unable to be folded, the height of the cover plate after being erected is smaller, so that not only the internal working condition of the hoisting opening can be observed by the staff from the periphery of the cover plate, but also the hoisting and transferring of the object is facilitated, and the probability of collision between the cover plate and the hoisted object is reduced. Preferably, when the first cover plate 21 is in the open position, the vertical distance between the top end 21a of the first cover plate 21 in the height direction and the plane where the top surface 1a of the frame 1 is located is less than 1.5 meters; when the second cover plate 22 is in the folded state, the vertical distance between the top end 22a of the second cover plate 22 in the height direction and the plane where the top surface 1a of the frame 1 is located is less than 1.5 meters.

[0034] Further, each first cover plate 21 is detachably connected with the first side 11 of the frame 1 through the first locking structure when the first cover plate 21 is in the open position, and each second cover plate 22 is detachably connected with the second side 12 of the frame 1 through the second locking structure when the second cover plate 22 is in the folded state.

[0035] In the embodiment, the first locking structure and the second locking structure are the same in structure, and only the first locking structure will be described below. Please refer to Figures 7 to 10The first locking structure comprises a latch 71, a spring 72, a latch holder 73 and a latch locking plate 74. The latch 71 comprises a shank 711, a handle 712 and a locking pin 713. The shank 711 is provided with a stopper 714 on the side surface. The handle 712 and the locking pin 713 are vertically connected to the top and bottom of the shank 711 respectively, and the handle 712 and the locking pin 713 are staggered by 90° in the horizontal direction. The latch holder 73 is connected to the bottom of the first cover plate 21. The latch holder 73 is provided with an upper positioning tube 75 and a lower positioning tube 76. The top of the latch holder 73 is provided with a positioning notch 732 matched with the handle 712. The spring 72 is sleeved on the shank 711. The top end and the bottom end of the spring 72 abut against the stopper 714 and the top end of the lower positioning tube 76 respectively. The latch locking plate 74 is connected to the frame 1. One side of the latch locking plate 74 is provided with a locking groove 743 matched with the locking pin 713. When the locking pin 713 is embedded in the locking groove 743, the first cover plate 21 and the frame 1 are detachably connected. When the handle 712 is embedded in the positioning notch, the latch 71 is locked on the first cover plate 21. Optionally, the latch holder 73 is composed of an angle steel.

[0036] In the unlocked state, the handle 712 of the latch 71 is embedded in the positioning notch 732 at the top end of the latch holder 73. When it is necessary to lock the cover plate, the handle 712 is taken out of the positioning notch 732 and rotated by 90°. The latch is pressed downward to the position of the upper positioning tube. At this time, the spring 72 is in the compressed state. Then, the upper handle 712 is continuously rotated by 90°. At this time, the locking pin 713 at the lower part of the latch is embedded in the locking groove 743 of the latch locking plate. The latch 71 is locked. When unlocking, the upper handle 712 of the latch is rotated by 90°. At this time, the lower locking pin 713 is moved out of the 743 of the latch locking plate 74. The elastic force of the spring 72 is released. The latch is automatically lifted up. Then, the latch is rotated by 90°. The upper handle 712 is embedded in the positioning notch 732 for fixation.

[0037] Further, when the movable beam 32 is in the retracted position, the movable beam 32 is detachably connected with the second cover plate 22 located behind the movable beam and in the folded state. Specifically, the second cover plate 22 is provided with a second movable latch 228. The movable beam 32 is provided with a plug hole 328 matched with the second movable latch 228. The second movable latch 228 is inserted into the plug hole 328, so that the movable beam 32 and the second cover plate 22 are detachably connected together.

[0038] In actual work, when the lifting opening is to be opened, the first sub-cover plate 221 near the second side of the frame in the second cover plate 22 is pulled upward, and under the driving of the synchronous rotating connecting assembly 23, the other sub-cover plate 221 is folded downward, and under the driving of the roller 24, the other sub-cover plate 221 rolls and slides on the second guide rail 34 of the movable beam 32 in the direction close to the first sub-cover plate 221 until it stops above the first guide rail 33 of the fixed beam 31. At this time, the folding cover plate has been opened, and the opposite first cover plate 21 is turned 90° to the open position. After all the cover plates are opened, the movable beam is pulled up to the retracted position by the pull rod chain 321 on the movable beam 32, and then the movable beam is locked by using the movable bolt 228 at the bottom of the second cover plate.

[0039] The heavy hammer balanced large-span arbitrary length equipment lifting opening of the embodiment is suitable for large-span (greater than 4 meters) arbitrary length lifting hole, and the split cover plate and the movable beam in the heavy hammer balanced structure are used. The first cover plate and the second cover plate use the heavy hammer balance principle, so that the weight moment of the cover plate and the moment generated by the heavy hammer below the cover plate reach a balanced state. In the whole process of opening or closing the folding cover plate, the cover plate moves along a pair of guide rails, eliminating the hidden danger of personnel and tools falling. Since the cover plate is supported by the cover plate support beam mechanism, the cover plate of the lifting opening can bear a large load, and heavy objects, forklifts and the like can be placed. The cover plate is folded and opened in the width direction by using the heavy hammer balance, and the movable beam arranged in the middle can be rotated upward by 90° to be opened, without affecting the upward and downward lifting of large objects.

[0040] The above description is further explanation of the present application in combination with specific embodiments and drawings. However, the present application can obviously be implemented in various other methods different from the description, and those skilled in the art can generalize and deduce according to actual use without departing from the content of the present application, so the content of the above specific embodiments should not limit the protection scope of the present application.

Claims

1. A lifting port, comprising a frame, multiple sets of split cover plates, and several sets of cover plate support beam mechanisms; the frame having a first side and a second side opposite to each other; each set of split cover plates includes a first cover plate and a second cover plate, each cover plate having a first end and a second end opposite to each other, the first end of the first cover plate being rotatably connected to a first side of the frame, and the first end of the second cover plate being rotatably connected to a second side of the frame; each set of cover plate support beam mechanisms includes a support beam and a support portion, the support beam being used to support two adjacent sets of split cover plates, and the support portion being disposed on the first side of the frame; characterized in that, The support beam includes a fixed beam and a movable beam, with the movable beam located directly in front of the fixed beam. One end of the fixed beam is connected to the second side of the frame, and the fixed beam is provided with a pair of first guide rails extending along the longitudinal direction of the fixed beam. One end of the movable beam is rotatably connected to a mounting bracket installed on the second side of the frame to switch between a cover plate support position and a retracted position. When the movable beam is in the cover plate support position, the other end of the movable beam presses against the support. When one end of the movable beam rotates upward relative to the mounting bracket, the movable beam switches from the cover plate support position to the retracted position. The movable beam is provided with a pair of second guide rails extending along the longitudinal direction of the movable beam. The first cover plate can be switched between a closed position and an open position. When the first cover plate is in the closed position, the first cover plate is supported on movable beams located on both sides of the first cover plate. When the first end of the first cover plate rotates upward relative to the first side of the frame, the first cover plate switches from the closed position to the open position. The second cover plate is a folding cover plate, which has an unfolded state and a folded state. Rollers are provided on both sides of the second end of the second cover plate. When the second cover plate is in the unfolded state, the second cover plate is supported on the fixed beam and the movable beam located on both sides of the second cover plate. The rollers on both sides of the second cover plate stop on the guide rails of the movable beam located on both sides of the second cover plate. When the first end of the second cover plate rotates upward relative to the second side of the frame, the second cover plate switches from the unfolded state to the folded state. The rollers on both sides of the second cover plate move from the guide rails of the movable beam located on both sides of the second cover plate to the guide rails of the fixed beam located on both sides of the second cover plate. When each of the first cover plates is in the open position, it is detachably connected to the first side of the frame via a first locking structure; when each of the second cover plates is in the folded state, it is detachably connected to the second side of the frame via a second locking structure; both the first locking structure and the second locking structure include a pin, a spring, a pin holder, and a pin locking plate. The pin includes a rod, a handle, and a locking pin. A stop is provided on the side of the rod. The handle and the locking pin are vertically connected to the top and bottom of the rod, respectively, and are horizontally offset by 90°. The pin holder is connected to the bottom of the cover plate and includes an upper positioning tube and a lower positioning tube. A positioning notch that mates with the handle is opened at the top of the pin holder. The spring is sleeved on the outside of the rod, with its top and bottom abutting against the stop and the top of the lower positioning tube, respectively. The pin locking plate is connected to the frame, and a locking groove that mates with the locking pin is opened on one side of the pin locking plate. When the locking pin is inserted into the locking groove, the cover plate and the frame are detachably connected; when the handle is inserted into the positioning notch, the pin is locked to the cover plate.

2. The lifting port according to claim 1, characterized in that, The mounting bracket includes a pair of gear transmission frames, which are located on both sides of the movable beam. Each gear transmission frame includes a gear bracket, a first gear shaft, a second gear shaft, a first gear, a second gear, an upper balance arm, and a lower counterweight arm. The gear bracket is connected to the second side of the frame. The first gear shaft and the second gear shaft are respectively disposed on the gear bracket, with the first gear shaft located above the second gear shaft. The first gear and the second gear are respectively sleeved on the first gear shaft and the second gear shaft, and the first gear and the second gear mesh with each other. One end of the upper balance arm is connected to the first gear to rotate synchronously with the first gear, and the other end of the upper balance arm is connected to the movable beam. One end of the lower counterweight arm is connected to the second gear to rotate synchronously with the second gear, and the other end of the lower counterweight arm is provided with a counterweight. The first gear shafts of the pair of gear transmission frames are connected as one unit to form a through shaft, which passes through the upper balance arm and the movable beam of the pair of gear transmission frames.

3. The lifting port according to claim 1, characterized in that, When the movable beam is in the retracted position, the movable beam is detachably connected to a second cover plate located behind the movable beam and in a folded state.

4. The lifting port according to claim 1, characterized in that, The fixed beam and the movable beam have the same structure, both including I-beams; the I-beam includes a top plate, a bottom plate and a web, the top and bottom ends of the web are connected to the top plate and the bottom plate respectively; the top surface of the top plate is used to support the cover plate, and the two sides of the web are respectively provided with guide rail support structures to support the guide rails.

5. The lifting port according to claim 4, characterized in that, The guide rail support structure includes multiple L-shaped stiffeners, which are spaced apart along the length of the guide rail. Each L-shaped stiffener is located between the top and bottom plates of the I-beam and is connected to the top, bottom, and web plates of the I-beam, respectively. At least a portion of the transverse side of each L-shaped stiffener extends to the outside of the I-beam, and the guide rail is connected to the transverse side of the multiple L-shaped stiffeners.

6. The lifting port as described in claim 1, characterized in that, The folding cover plate includes multiple sub-cover plates, and the adjacent ends of two adjacent sub-cover plates are rotatably connected to each other through multiple synchronous rotational connecting components.

7. The lifting port as described in claim 1, characterized in that, When the movable beam is in the position supported by the cover plate, the gap between one end of the movable beam and the other end of the fixed beam is 2mm to 5mm.

8. The lifting port as described in claim 1, characterized in that, When the first cover plate is in the open position, the vertical distance from the top of the first cover plate in the height direction to the plane containing the top surface of the frame is less than 1.5 meters; When the second cover plate is in the folded state, the vertical distance from the top of the second cover plate in the height direction to the plane where the top surface of the frame is located is less than 1.5 meters.

Images