Amplitude modulation door seal and door seal adjustment method

Abstract

The present invention relates to an amplitude-modulated door seal, which is suitable for warehouses with high requirements for thermal insulation and sealing of warehouse loading and unloading ports, comprising: two side enclosure insulation panels and a top enclosure insulation panel arranged on the periphery of the warehouse door frame; a top sealing curtain arranged below the top enclosure insulation panel, and two side shrinkage sealing components arranged on the two side enclosure insulation panels that can move laterally and parallely. By adjusting the height and width of the sealing curtain of the door seal, the sealing curtain can be tightly connected to the top and both sides of the van body, thereby forming a closed loading and unloading passage. When the van is unloading at the warehouse door, the height and width of the sealing curtain of the door seal can be adjusted by the amplitude-modulated door seal to be tightly connected to the top and both sides of the van body, thereby forming a closed loading and unloading passage, preventing indoor and outdoor communication, avoiding pollution of the warehouse by the external environment, and reducing the heat exchange inside and outside the warehouse.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics warehousing loading and unloading passages, and more specifically, to an amplitude-modulated door seal suitable for cold chain logistics warehouses, constant temperature warehouses, cold storages, food and medicine systems, or warehouses with special requirements for the sealing of warehouse inlets and outlets, as well as a door seal adjustment method. Background Art

[0002] There are three traditional methods for sealing warehouse cargo loading and unloading doors and the rear of vans: sponge pad door seals, mechanical door seals, and inflatable door seals. However, all of them have some shortcomings: (1) The sponge pad door seal has a fixed width and cannot be adjusted, so it is only suitable for a relatively single type of vehicle; (2) The mechanical door seal cannot be adjusted and has poor sealing performance; (3) The airbag of the inflatable door seal is easily scratched by the vehicle, and the airbag needs to be continuously inflated during operation, which consumes a lot of energy.

[0003] Due to the poor sealing around the doors of traditional products during loading and unloading operations, which leads to indoor and outdoor heat exchange or the high energy consumption of the equipment itself, the interior of the warehouse is affected by the outdoor environment and cannot meet the cleanliness requirements, which increases its operating and management costs. Summary of the Invention

[0004] The purpose of the present invention is to provide an amplitude-modulated door seal. When a van is unloading at the warehouse door, the height and width of the door seal can be adjusted by the amplitude-modulated door seal to connect with the van body, thereby forming a closed loading and unloading channel, preventing the indoor and outdoor from communicating, avoiding pollution of the warehouse by the external environment, and reducing the heat exchange inside and outside the warehouse.

[0005] Another object of the present invention is to provide a method for adjusting a door seal.

[0006] The object of the present invention is achieved like this:

[0007] A modulated door seal is suitable for warehouses with high requirements for thermal insulation and sealing at the warehouse loading and unloading ports. It includes: an outer frame structure of an enclosing insulation board, a top sealing curtain and two side contraction sealing components. The top sealing curtain and the two side contraction sealing components are linked by a rolling curtain mechanism.

[0008] The outer frame structure of the enclosure insulation board includes: two side enclosure insulation boards and a top enclosure insulation board arranged on the periphery of the warehouse door frame. A translation slide rail with a horizontal track is provided under the top enclosure insulation board, and a translation pulley is provided inside the translation slide rail.

[0009] The top sealing curtain, the upper end of which is fixed below a rolling curtain mechanism and is arranged below the top enclosure insulation board, the rolling curtain mechanism includes: a roller, two-end bearings, a support plate and a fixing frame, the support plate is located below the roller, the two-end bearings are fixed on the support plate, the upper end of the top sealing curtain is fixed on both sides of the support plate, a belt is provided inside the top sealing curtain, one end of the belt is fixed on the roller, the other end of the belt passes through the support plate and is fixed on a counterweight structure, the counterweight structure is fixed below the top sealing curtain, the rolling curtain mechanism is connected to the belt of the top sealing curtain and realizes the rising and falling adjustment of the top sealing curtain by controlling the winding and releasing of the belt, the rolling curtain mechanism is electrically connected to the electric system and the travel switch, the electric system is used to provide kinetic energy to the rolling curtain mechanism, and the travel switch is arranged below the counterweight structure to locate the required height for lifting and lowering the top sealing curtain.

[0010] The side retraction sealing components, each of the side retraction sealing components includes: a side sealing plate, a translation vertical rail, a side counterweight system and a side retraction curtain that can change between a retracted state and an expanded state. The translation vertical rail and the side counterweight system are arranged in the side retraction curtain, one side of the translation vertical rail is connected to the side sealing plate and the other side is connected to its corresponding side enclosure insulation board. The two sides of the side retraction curtain are respectively connected to the side sealing plate and the side enclosure insulation board to form an integral closed surface structure. The top end of the translation vertical rail is connected to the translation pulley arranged in the translation slide rail so that the translation vertical rail can move laterally parallel to the plane where the periphery of the warehouse door frame is located, thereby driving the side retraction curtain to retract or expand laterally parallel to the plane where the periphery of the warehouse door frame is located.

[0011] Wherein, each of the side counterweight systems includes: a counterweight steel plate, a pulley group, a support rod, a counterweight steel cable and a buffer tension spring, the pulley group includes an upper pulley group and a lower pulley group respectively installed at the upper and lower ends of the counterweight steel plate, the upper pulley group and the lower pulley group are respectively installed in the translation vertical rail, one end of the support rod is movably connected to the counterweight steel plate and the other end is movably connected to the side enclosure insulation board on the same side, one end of the counterweight steel cable is connected to the rolling curtain mechanism and the other end is connected to the rolling curtain mechanism through a fixed pulley arranged on the counterweight steel plate on the same side. The buffer tension spring is connected so that the excess counterweight steel cable is in a tensioned state when the top sealing curtain drops to the lowest position. A positioning nylon block is provided at the position where the counterweight steel cable is located above the buffer tension spring to ensure that the retractable curtains and sealing plates on both sides are retracted or released accordingly when the top sealing curtain rises or falls. The bottom of the buffer tension spring is fixed at the lower position in the translation vertical rail; when the counterweight steel cable is released by the rolling curtain mechanism, the side counterweight system is released so that the translation vertical rail is translated laterally inward under the drive of the side counterweight system.

[0012] When the equipment is in the initial state, the roller shutter mechanism tightens the belt of the top sealing curtain so that the top sealing curtain is folded in the highest position. At this time, the counterweight steel cable is tightened so that the sealing plates on both sides and the top sealing curtain are tightened. At this time, the amplitude modulation door sealing entrance is opened to the maximum size; the van is correctly reversed into the loading and unloading position and stopped steadily; the roller shutter mechanism can be rotated electrically or manually through an electric switch or a manual switch to make the top sealing curtain drop and release the counterweight steel cable connected to the roller shutter mechanism at the same time. The counterweight system falls freely under the action of gravity, causing the translation vertical rail to automatically move laterally to the middle, and the sealing plates on both sides are close to the car body; at the same time, the top roller shutter mechanism continues to pull the top The top sealing curtain is lowered to the top of the car body to form a closed loading and unloading channel. Two independent counterweight systems and buffer springs can ensure that the sealing plates connected to the vertical rails on both sides are close to the car body when they are attached to the side body of the truck. The side sealing plates are free squeeze-type seals on the side body of the truck, and loading and unloading operations can be carried out at this time; after the loading and unloading operations are completed, the roller shutter mechanism can be rotated electrically or manually in reverse through the electric open or manual switch to pull the top sealing curtain to the highest position, and the counterweight steel cable is tightened before the top sealing curtain is pulled to the highest position, so that the sealing plates on both sides and the top sealing curtain are tightened, the amplitude modulation door sealing entrance is opened to the maximum size, and the equipment returns to its initial state.

[0013] The amplitude-modulating door seal proposed by the present invention, due to the adoption of the above-mentioned technical solution, can be used to adjust the height and width of the door seal to connect with the van body when the van is unloading at the warehouse door, thereby forming a closed loading and unloading channel, preventing the indoor and outdoor from communicating, avoiding pollution of the warehouse by the external environment, and reducing the heat exchange inside and outside the warehouse. The difference between the lateral translation stroke of the sealing plates on both sides and the adjustment stroke of the top sealing curtain, as well as the distance deviation generated when the van is docked, can be adjusted in a free extrusion manner by two independent counterweight systems and buffer springs. Alternatively, this can be achieved by lengthening the free stroke of the counterweight steel cable. The buffer spring, in conjunction with the lengthened free stroke of the counterweight steel cable, ensures that the side sealing plates are tightened synchronously when the top sealing curtain is tightened, and the counterweight steel cables of the sealing plates on both sides are released synchronously when the top rolling curtain mechanism releases the top sealing curtain, thereby automatically adjusting the parking position deviation and the size deviation of the van. The amplitude modulation door seal proposed by the present invention has a wide adjustable range of sealing plates on both sides, which can be used to seal vans of different sizes. At the same time, the side sealing plates and the translational vertical rails are flexibly connected by the side retractable curtains, which will not be easily damaged, have a long service life, and save energy and reduce consumption.

[0014] Preferably, steel cable reels are provided at both ends of the rolling shutter mechanism; one end of each counterweight steel cable is connected to its corresponding steel cable reel of the rolling shutter mechanism, and the other end is connected to the buffer tension spring through the fixed pulley on the counterweight steel plate; the rolling shutter mechanism is connected to an electric switch and / or a manual switch, and the rolling shutter mechanism can be rotated electrically or manually through the electric switch or manual switch to release or tighten the counterweight steel cable. When the rolling shutter mechanism rotates, the counterweight system in the translation vertical rail is tightened or released at the same time, thereby realizing the linkage between the top sealing curtain and the retracted sealing components on both sides.

[0015] Wherein, the side retractable curtain is connected to the corresponding side enclosure insulation board through a bidirectional spring hinge.

[0016] Furthermore, a curtain windproof cover is provided at the upper portion of the top sealing curtain. When the top sealing curtain is in a retracted state, the curtain windproof cover can be used to shield the top sealing curtain in the retracted state.

[0017] A method for adjusting the size of the door opening of a specific warehouse, wherein the specific warehouse is a warehouse with high requirements for thermal insulation and sealing of the warehouse loading and unloading port. The method comprises: installing the amplitude-modulated door seal as described above at the door of the specific warehouse; and further comprising: adjusting the distance deviation between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the corresponding side of the parked van by forming free extrusion between the side end face of the side sealing plate and the side of the van through the gravity of the side counterweight system.

[0018] A method for adjusting the opening size of a door of a specific warehouse, wherein the specific warehouse is a warehouse with high requirements for thermal insulation and sealing of the warehouse loading and unloading port, the method comprising: installing the amplitude-modulated door seal as described above at the door of the specific warehouse; further comprising: the distance deviation between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the corresponding side of the parked van is adjusted by the gravity action of the side counterweight system to form free extrusion between the side end face of the side sealing plate and the side of the van; and / or the stroke difference between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the lifting stroke of the top sealing curtain is adjusted by adjusting the diameter size of the reel of the rolling curtain mechanism and the steel cable reel and / or the extension and contraction stroke of the buffer tension spring.

[0019] Specifically, when the top sealing curtain descends more than one circle of the reel, the buffer spring is released from the travel required for the side sealing plates to move inward. At this time, the amplitude-modulated door seal can reach the minimum width, and the sealing plates on both sides are close to the truck body. When they continue to descend to the lowest position, the excess counterweight steel cable is contracted by the buffer spring and remains in a tensioned state; when the top sealing curtain rises, the buffer spring is stretched to the highest position, which just tightens the side sealing plates, and the amplitude-modulated door seal reaches the maximum width.

[0020] In actual application, the maximum distance between the sealing plates on both sides can be designed to be 2900 mm, and the distance between the sealing plates on both sides can be configured to be adjustable between 1700 mm and 2900 mm.

[0021] In actual application, the distance between the top sealing curtain and the warehouse platform floor can be designed to be 3250 mm, and the distance between the top sealing curtain and the warehouse platform floor can be configured to be adjustable between 1300 mm and 3250 mm.

[0022] In actual applications, the door opening dimensions of warehouses with high requirements for thermal insulation and sealing at the warehouse loading and unloading openings are typically set at 2800mm wide and 3000mm high. In this case, the top enclosure insulation panels are preferably installed 600mm from the top wall of the warehouse door frame, and the side enclosure insulation panels are preferably installed 400mm from the side walls of the warehouse door frame.

[0023] Among them, when the two side sealing plates and the top sealing curtain are tightly attached to the vehicle body to form a closed loading and unloading passage, the top sealing curtain is tightly attached to the two side sealing plates and is located in front of the side sealing plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other advantages and features of the present invention are illustrated by the following description of an embodiment of the present invention in conjunction with the accompanying drawings, which are given by way of example but are not limited thereto, in which:

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of a preferred embodiment of the amplitude-modulated door seal of the present invention. Only a partial top sealing curtain is shown in the figure to better illustrate the structure of the side contraction sealing component.

[0026] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the embodiment shown in .

[0027] Figure 3 for Figure 1 The front structural diagram of the embodiment shown in FIG, at this time the device is in the initial state.

[0028] Figure 4 for Figure 1 The front structural diagram of the embodiment shown in , at this time the device is in a changing state.

[0029] Figure 5 for Figure 1 , the front structural diagram of the embodiment is shown in , at this time the device is in the retracted state, that is, the initial state of the device, the distance between the sealing plates on both sides is the largest, and the top sealing curtain is retracted to the highest point.

[0030] Figure 6 for Figure 1 The front structural diagram of the embodiment shown in the figure shows that the equipment is in a fully expanded state, the distance between the sealing plates on both sides is 1700mm, and the distance between the top sealing curtain and the platform floor is 1300mm. DETAILED DESCRIPTION

[0031] A modulated door seal is suitable for warehouses with high requirements for thermal insulation and sealing at the warehouse loading and unloading ports. It includes: an outer frame structure of an enclosing insulation board, a top sealing curtain and two side contraction sealing components. The top sealing curtain and the two side contraction sealing components are linked by a rolling curtain mechanism.

[0032] The following combination Figure 1-6 To describe the specific structure of a preferred embodiment of the amplitude modulation door seal proposed in the present invention.

[0033] The outer frame structure of the enclosure insulation board includes: two side enclosure insulation boards 1 and a top enclosure insulation board 2 arranged on the periphery of the warehouse door frame. A translation slide rail 10 with a horizontal track is provided below the top enclosure insulation board 2, and a translation pulley 11 is provided inside the translation slide rail 10.

[0034] The upper end of the top sealing curtain 5 is fixed under a rolling curtain mechanism 6 and is arranged under the top enclosure insulation board 2 and fixed to the enclosure insulation boards 1 on both sides. The rolling curtain mechanism 6 includes: a reel and a support plate. The support plate is located under the reel, and the bearings at both ends of the reel are fixed on the support plate. Steel cable reels 20 are respectively provided at both ends of the rolling curtain mechanism 6. The upper end of the top sealing curtain 5 is fixed to both sides of the support plate, and the fixing frames at both ends of the support plate are fixed to the maintenance insulation boards 1 on both sides. A belt 21 is provided inside the top sealing curtain 5. One end of the belt 21 is fixed to the reel, and the other end passes through the support plate and is fixed to the counterweight structure under the top sealing curtain 5. The rolling curtain mechanism 6 is connected to the belt 21 of the top sealing curtain 5 and realizes the rising and falling adjustment of the top sealing curtain 5 by controlling the winding and releasing of the belt 21 on the reel. The rolling curtain mechanism 6 is electrically connected to an electric switch and / or manual switch 18, an electronic control system 19, and a limit switch 15. The electronic control system 19 is used to provide kinetic energy to the rolling curtain mechanism 6, and the limit switch 15 is used to determine the required height for raising and lowering the top sealing curtain 5. A curtain windproof cover 16 is also provided at the top of the top sealing curtain 5.

[0035] Each of the two-side retractable sealing assemblies includes: a side sealing plate 4, a translatable vertical rail 8, a side counterweight system 9, and a side retractable curtain 3 that can change between a retracted state and an expanded state. The translatable vertical rail 8 and the side counterweight system 9 are disposed within the side retractable curtain 3. One side of the translatable vertical rail 8 is connected to the side sealing plate 4, while the other side is connected to its corresponding side enclosure insulation board 1. The side retractable curtain 3 is wrapped around the exterior of the translatable vertical rail 8 and the counterweight system 9. The two sides of the side retractable curtain 3 are respectively connected to the side sealing plate 4 and the side enclosure insulation board 1 to form an integral closed surface structure. The top end of the translatable vertical rail 8 is connected to a translatable pulley 11 disposed within a translatable slide rail 10, allowing the translatable vertical rail 8 to move laterally parallel to the plane where the warehouse door frame is located, thereby driving the side retractable curtain 3 to retract or expand laterally parallel to the plane where the warehouse door frame is located.

[0036] The counterweight system 9 on each side includes: a counterweight steel plate, a pulley group, a support rod, a counterweight steel cable 12 and a buffer tension spring 14. The pulley group includes an upper pulley group and a lower pulley group respectively installed at the upper and lower ends of the counterweight steel plate. The upper pulley group and the lower pulley group are respectively installed in the translation vertical rail 8. One end of the support rod is connected to the counterweight steel plate through a two-way spring hinge 7, and the other end is connected to the side enclosure insulation board 1 on the same side through a two-way spring hinge 7. One end of the counterweight steel cable 12 is connected to the cable reel 20 of the rolling shutter mechanism 6, and the other end is connected to the counterweight steel plate on the same side through a The fixed pulley is connected to the buffer tension spring 14, so that the excess counterweight steel cable 12 is in a tensioned state when the top sealing curtain 5 drops to the lowest position. A positioning nylon block 25 is provided above the counterweight steel cable 12 above the buffer tension spring 14 to ensure that the retractable curtains 3 and the sealing plates 4 on both sides are retracted or released accordingly when the top sealing curtain 5 rises or falls. The bottom of the buffer tension spring 14 is fixed at the lower position in the translation vertical rail 8; when the counterweight steel cable 12 is released by the rolling curtain mechanism 6, the side counterweight system 9 is released, so that the translation vertical rail 8 is translated laterally inward under the drive of the side counterweight system 9.

[0037] In the initial state of the equipment, the roller shutter mechanism 6 tightens the belt 21 of the top sealing curtain 5, so that the top sealing curtain 5 is folded at the highest position. At this time, the counterweight steel cable 12 is tightened, so that the sealing plates 4 on both sides and the top sealing curtain 5 are tightened. At this time, the amplitude modulation door sealing entrance is opened to the maximum size; the van is correctly reversed into the loading and unloading position and stopped steadily; the roller shutter mechanism 6 can be rotated electrically or manually through the electric switch or manual switch 18, so that the top sealing curtain 5 descends, and at the same time, the counterweight steel cable 12 connected to the roller shutter mechanism 6 is released, and the counterweight system 9 falls freely under the action of gravity, causing the side of the horizontal vertical rail 8 to fall. It automatically moves horizontally toward the middle, and the sealing plates 4 on both sides are close to the car body. At the same time, the top roller shutter mechanism 6 continues to lower the top sealing curtain 5 to the top of the car body, thereby forming a closed loading and unloading channel, and loading and unloading operations can be carried out at this time; after the loading and unloading operations are completed, the roller shutter mechanism 6 can be electrically or manually rotated in reverse through the electric or manual switch 18 to pull the top sealing curtain 5 to the highest position. Before the top sealing curtain 5 is pulled to the highest position, the counterweight steel cable 12 is tightened to tighten the sealing plates 4 on both sides and the top sealing curtain 5, the amplitude modulation door sealing entrance is opened to the maximum size, and the equipment returns to the initial state.

[0038] The rolling shutter mechanism 6 can be rotated electrically or manually through the electric open or manual switch 18 to release or tighten the counterweight steel cable 12. When the rolling shutter mechanism 6 rotates, the counterweight system 9 in the translation vertical rail is tightened or released at the same time, thereby realizing the linkage between the top sealing curtain 5 and the retractable sealing components on both sides.

[0039] Among them, the distance deviation between the lateral translation stroke of the side sealing plate 4 in the lateral parallel movement along the plane where the outer periphery of the warehouse door frame is located and the corresponding side of the parked van is adjusted by the gravity action of the side counterweight system 9 to form free extrusion between the side end face of the side sealing plate 4 and the side of the van; the stroke difference between the lateral translation stroke of the side sealing plate 4 in the lateral parallel movement along the plane where the outer periphery of the warehouse door frame is located and the lifting stroke of the top sealing curtain 5 is adjusted by adjusting the diameter size of the reel of the rolling curtain mechanism 6 and the steel cable reel 20 and / or the extension and contraction stroke of the buffer tension spring 14.

[0040] Specifically, when the top sealing curtain 5 descends by more than one circle of the reel, the buffer spring 14 is released from the travel required for the side sealing plates 4 to move inward. At this time, the amplitude-modulated door seal can reach the minimum width, and the sealing plates 4 on both sides are close to the truck body. When they continue to descend to the lowest position, the excess counterweight steel cable is contracted by the buffer spring 14 and remains in a tensioned state; when the top sealing curtain 5 rises, the buffer spring 14 is stretched to the highest position, which just tightens the side sealing plates 4, and the amplitude-modulated door seal reaches the maximum width.

[0041] The maximum distance between the sealing panels 4 on both sides can be designed to be 2900mm, and the distance between the sealing panels 4 on both sides can be adjusted between 1700mm and 2900mm. The distance between the top sealing curtain 5 and the warehouse platform floor can be designed to be 3250mm, and the distance between the top sealing curtain 5 and the warehouse platform floor can be adjusted between 1300mm and 3250mm.

[0042] The door opening size of the warehouse is usually set to 2800mm wide and 3000mm high. In this case, it is preferred to set the top enclosure insulation board 2 at 600mm from the top wall of the warehouse door frame, and the side enclosure insulation board 1 is preferably set at 400mm from the side wall of the warehouse door frame.

[0043] When the side sealing plates 4 and the top sealing curtain 5 are in close contact with the carriage body to form a closed loading and unloading passage, the top sealing curtain 5 is in close contact with the side sealing plates 4 and is located in front of the side sealing plates 4 .

[0044] Although the present invention has been described above based on preferred embodiments, this does not mean that the scope of the present invention is limited to the above-described structure. As long as a person skilled in the art can easily develop an equivalent alternative structure after reading the above description, any equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included in the patent scope of the present invention.

Claims

1. A modulated door seal, suitable for warehouses with high requirements for thermal insulation and sealing of warehouse loading and unloading ports, characterized by: include: An outer frame structure of an enclosure and insulation board, comprising: two side enclosure and insulation boards arranged on the periphery of the warehouse door frame and a top enclosure and insulation board, a translation slide rail with a horizontal track is provided below the top enclosure and insulation board, and a translation pulley is provided inside the translation slide rail; The top sealing curtain is fixed with a roller shutter mechanism and is arranged below the top enclosure insulation board, and the roller shutter mechanism comprises: a roller shaft, bearings at both ends, a supporting plate and a fixing frame, and the supporting plate is located below the roller shaft, and the bearings at both ends are fixed on the supporting plate, and the upper end of the top sealing curtain is fixed on both sides of the supporting plate, and a belt is provided inside the top sealing curtain, one end of the belt is fixed on the roller shaft, and the other end of the belt passes through the supporting plate and is fixed on a counterweight structure, and the counterweight structure is fixed below the top sealing curtain, and the roller shutter mechanism is connected to the belt of the top sealing curtain and realizes the rising and falling adjustment of the top sealing curtain by controlling the winding and releasing of the belt, and the roller shutter mechanism is electrically connected to an electric system and a travel switch, and the electric system is used to provide kinetic energy to the roller shutter mechanism, and the travel switch is arranged below the counterweight structure and is used to locate the required height for lifting and lowering the top sealing curtain; The side retraction sealing components are each composed of: a side sealing plate, a translation vertical rail, a side counterweight system and a side retraction curtain that can change between a retracted state and an expanded state, the translation vertical rail and the side counterweight system being arranged in the side retraction curtain, one side of the translation vertical rail being connected to the side sealing plate and the other side being connected to its corresponding side enclosure insulation plate, the two sides of the side retraction curtain being respectively connected to the side sealing plate and the side enclosure insulation plate to form an integral closed surface structure, the top end of the translation vertical rail being connected to the translation pulley arranged in the translation slide rail so that the translation vertical rail can move laterally parallel to the plane where the outer periphery of the warehouse door frame is located, thereby driving the side retraction curtain to retract or expand laterally parallel to the plane where the outer periphery of the warehouse door frame is located; each side counterweight system comprises: a counterweight steel plate, a pulley group, a support rod, a counterweight steel cable and a buffer tension spring, the pulley group comprises a pair of rollers respectively installed at the upper and lower ends of the counterweight steel plate The top end face of said sliding arm is fixed with a wheel hub, and the bottom end face of said wheel hub is connected with a wheel hub, and the wheel hub is connected with a up-down knob. The top sealing curtain and the two-side contraction sealing components are linked together through the rolling curtain mechanism.

2. The amplitude modulation door seal according to claim 1, characterized in that: Steel cable reels are provided at both ends of the rolling shutter mechanism; one end of each counterweight steel cable is connected to its corresponding steel cable reel of the rolling shutter mechanism, and the other end is connected to the buffer tension spring through the fixed pulley on the counterweight steel plate; the rolling shutter mechanism is connected to an electric switch and / or a manual switch, and the rolling shutter mechanism can be rotated electrically or manually through the electric switch or manual switch to release or tighten the counterweight steel cable.

3. The amplitude modulation door seal according to claim 1, characterized in that: The support rod is connected to the corresponding side enclosure insulation board through a bidirectional spring hinge.

4. The amplitude modulation door seal according to claim 1, characterized in that: A curtain windproof cover is also provided on the upper portion of the top sealing curtain.

5. A method for adjusting the door opening size of a specific warehouse, wherein the specific warehouse is a warehouse with high requirements for thermal insulation and sealing of the warehouse loading and unloading opening, characterized in that: The method includes: installing the amplitude-modulated door seal as described in claim 1 at the door of the specific warehouse; and also includes: the distance deviation between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the corresponding side of the parked van is adjusted by the gravity of the side counterweight system to form free extrusion between the side end face of the side sealing plate and the side of the van.

6. A method for adjusting the door opening size of a specific warehouse, wherein the specific warehouse is a warehouse with high requirements for thermal insulation and sealing of the warehouse loading and unloading opening, characterized in that: The method comprises: installing the amplitude-modulated door seal according to any one of claims 2 to 4 at the door of the specific warehouse; and further comprising: The distance deviation between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the corresponding side of the parked van is adjusted by the free extrusion between the side end surface of the side sealing plate and the side of the van formed by the gravity of the side counterweight system; and / or The difference in stroke between the lateral translation stroke of the side sealing plate in the lateral parallel movement along the plane where the periphery of the warehouse door frame is located and the lifting stroke of the top sealing curtain is adjusted by adjusting the diameter size of the reel of the rolling curtain mechanism and the steel cable reel and / or the extension and contraction stroke of the buffer tension spring.

7. The method according to claim 5 or 6, wherein: When the top sealing curtain descends more than one circle of the reel, the buffer tension spring is released from the travel required for the side sealing plates to move inward. At this time, the amplitude-modulated door seal can reach the minimum width, and the sealing plates on both sides are close to the truck body. When the seal continues to descend to the lowest position, the redundant counterweight steel cable is contracted by the buffer tension spring and remains in a tensioned state. When the top sealing curtain rises, the buffer tension spring is stretched to the highest position, which just tightens the side sealing plates, and the amplitude-modulated door seal reaches the maximum width.

8. The method according to claim 5 or 6, wherein: The distance between the sealing plates on both sides can be adjusted between 1700 mm and 2900 mm.

9. The method according to claim 5 or 6, wherein: The distance between the top sealing curtain and the warehouse platform floor can be adjusted between 1300mm and 3250mm.

10. The method according to claim 5 or 6, wherein: When the two side sealing plates and the top sealing curtain are in close contact with the vehicle body to form a closed loading and unloading passage, the top sealing curtain is in close contact with the two side sealing plates and is located in front of the side sealing plates.

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