A protection device and protection method for a refrigerated vehicle compartment

Abstract

The application discloses a kind of protective devices and protection methods for refrigerated car, it is related to car protective device and protection method technical field, including box, the door of box is rotatably connected on the door frame of box, two The side of the door opposite is provided with door strip assembly, the sealing property of two door strip assemblies is increased when mutual contact, the outside of the door is connected with door lock catch seat, the lock tongue is rotatably connected on the door lock catch seat, the rotating rod extending into the inside of door is connected on the lock tongue, the one end of the rotating rod in the box is connected with push-pull assembly, the push-pull assembly is connected with door strip assembly, push-pull assembly drives door strip assembly to act, the inside of the push-pull assembly is provided with locking assembly. Play the role of closing the gap between two doors, solve the problem that only rely on adhesive tape to fit in the middle of door, vertical gap is easy to leak cold, improve the sealing reliability and heat preservation of the butt joint area between door.

Description

Technical Field

[0001] This invention relates to the technical field of protective devices and methods for refrigerated truck compartments, and more specifically to a protective device and method for refrigerated truck compartments. Background Technology

[0002] Refrigerated truck compartments are the core carriers of cold chain transportation, widely used in the transport of temperature-sensitive goods such as fresh produce, pharmaceuticals, and food. The sealing performance of a refrigerated truck compartment directly determines the stability of the internal temperature and the energy consumption level of the refrigeration unit, making it a key factor in ensuring cargo quality and reducing transportation costs. Currently, refrigerated truck compartments typically have sealing strips installed around the doors, utilizing the elastic deformation of these strips to fill the gaps between the door and the door frame, thereby achieving a seal.

[0003] The following problems still exist in the use of refrigerated trucks: 1. Refrigerated truck compartments mostly use a double-door structure. When the two doors are closed, a vertical seam is formed in the middle. The existing sealing method relies solely on the rubber strips on the edges of the doors to seal this seam. However, due to the limited elasticity of the rubber strips, coupled with deformation and wear after long-term use, it is difficult to form a reliable seal between the two doors, which easily leads to cold leakage and affects the insulation capacity. Sealing failure not only significantly increases the energy consumption of the refrigeration unit and transportation costs, but may also lead to uneven temperature distribution inside the compartment, resulting in spoilage of the goods.

[0004] 2. Refrigerated trucks experience varying degrees of road bumps and vibrations during transportation, which increases the inherent assembly gap between the door and the frame. Furthermore, impacts from frequent opening and closing of the door, or slight deformation of the truck body after prolonged use, can lead to insufficient contact pressure between the sealing strip and the frame, making it difficult to maintain a proper seal.

[0005] 3. Refrigerated truck compartments are in a low-temperature and high-humidity environment for a long time, and the sealing surfaces between the compartment doors and the door frames are prone to freezing, making the compartment doors difficult to open.

[0006] Therefore, it is necessary to propose a protective device and method for refrigerated truck compartments to solve the above problems. Summary of the Invention

[0007] In view of the above situation and to overcome the defects of the prior art, the present invention provides a protective device and method for refrigerated truck compartments to solve the problems mentioned in the background art.

[0008] The technical solution is as follows: The present invention includes a box body and a box door rotatably connected to the box body door frame. A door strip assembly is provided on one side of the two box doors facing each other. When the two door strip assemblies are in contact with each other, the sealing performance of the box door is increased. A door lock seat is connected to the outside of the box door. A lock tongue is rotatably connected to the door lock seat. A rotating rod extending into the box door is connected to the lock tongue. A push-pull assembly is connected to one end of the rotating rod inside the box body. The push-pull assembly is connected to the door strip assembly. The push-pull assembly drives the door strip assembly to move. A locking assembly is provided inside the push-pull assembly. The locking assembly restricts the push-pull assembly. A sealing ring plate is connected to the inner ring surface of the box door frame. A sealing component that moves toward the sealing ring plate is slidably connected inside the box door. The sealing component that contacts the sealing ring plate increases the overall sealing performance. A rotating rod seat is installed on the outer side of the box door. A locking rod is rotatably connected inside the rotating rod seat. A linkage component that drives the sealing component to move is provided outside the locking rod.

[0009] Preferably, the door strip assembly includes a strip frame, a first sealing strip connected to one side of the strip frame, a strip plate slidably connected inside the strip frame, the strip plate and the strip frame being connected by a spring, and the two doors being sealed by sealing strips extending in opposite directions.

[0010] Preferably, the housing is internally connected to a guide seat, and an optical axis is slidably connected inside the guide seat. One end of the optical axis is connected to a strip plate, and the guide seat and the strip plate are connected by a spring. One end of the optical axis is externally connected to a telescopic drive device that pushes the optical axis to move.

[0011] Preferably, the push-pull assembly includes a gear connected to one end of the rotating rod, one end of one of the optical shafts is connected to a rack that meshes with the gear, the door lock seat is provided with a limiting plate that limits the rotation angle of the lock tongue, and a support frame that supports the gear is connected inside the housing.

[0012] Preferably, the gear has a cavity on the side near the door lock seat, the rotating rod has an external spline on the end near the gear, the rotating rod spline is connected to the inside of the gear, the outside of the rotating rod is connected to a movable disk located in the cavity, the movable disk and the cavity are connected by a spring, the door lock seat has a positioning pin installed on the side near the movable disk, and the movable disk has a positioning hole corresponding to the positioning pin.

[0013] Preferably, a U-shaped frame is installed inside the door, and symmetrically arranged L-shaped plates are slidably connected inside the U-shaped frame. The sealing assembly includes a second sealing strip connected to one side of the L-shaped plate. The L-shaped plate and the U-shaped frame are connected by a spring. The second sealing strip increases the sealing performance after contacting the sealing ring plate.

[0014] Preferably, a driven plate is slidably connected inside the U-shaped frame, and a symmetrically arranged drive plate is slidably connected inside the box door. The two drive plates move towards each other. An equally spaced inclined groove is opened on the side of the driven plate facing the drive plate. A conical block corresponding to the inclined groove is connected to the drive plate. A telescopic structure that drives the driven plate to move is connected to one side of the driven plate.

[0015] Preferably, the linkage assembly includes a movable sleeve sleeved outside the locking rod, an oblique groove is formed on the outer wall of the locking rod, a sliding pin located in the oblique groove is connected to the inner annular surface of the movable sleeve, a partition plate is connected inside the housing, a connecting rod is rotatably connected to the partition plate, the short rod of the connecting rod is slidably connected to the drive plate, a strip groove is formed at the long rod of the connecting rod, and a movable pin located in the strip groove is connected to the outer wall of the movable sleeve.

[0016] Preferably, the sealing ring plate has a recessed portion on the side near the second sealing strip, a protrusion is provided in the recessed portion, an electric heating wire is installed in the protrusion, the second sealing strip is a hollow air bag, and an insulation plate that wraps the electric heating wire is connected to one side of the sealing ring plate.

[0017] As having the same inventive concept as the above-mentioned technical solution, this invention also claims protection for a protective method for refrigerated truck compartments, which, using the aforementioned protective device for refrigerated truck compartments, includes the following steps: S1. Loading: After the goods are placed in the container, close the container door. Rotate the locking lever using the outer handle to close the container door. The second sealing strip on one side of the container door will then come into contact with the sealing ring plate.

[0018] S2. Increase protection between the door and the cabinet: When the outer handle is rotated into the door lock seat, the linkage component on the outer wall of the lock rod causes the driven plate to move. The compressed spring increases the contact between the second sealing strip and the sealing ring plate, thus increasing the sealing performance.

[0019] S3. Increase protection between cabinet doors: Rotate the latch to align it with the door lock seat. The latch, through the locking component, causes the door strip assembly to extend outward. The door strip assemblies of the two cabinet doors extend into each other and contact each other, increasing the sealing between the cabinet doors.

[0020] S4. Unlocking: When unloading, activate the heating element to prevent the door from freezing to the body. Then rotate the latch to release the restriction on the outside handle. The rotating latch causes the door strip assembly to retract into the door, allowing the door to be opened and the unloading process to complete.

[0021] Compared with existing known technologies, the technical solution provided by this invention has the following significant advantages: 1. Through the coordinated arrangement of the cabinet door, door strip assembly, latch, rotating rod, gear and rack, after the cabinet door is closed, rotating the latch will drive the first sealing strip to extend from the side of the cabinet door through gear and rack transmission, so that the vertical joint gap between the two cabinet doors is filled and sealed, which can seal the gap between the two doors, solve the problem of the vertical gap being easily leaked due to the cabinet door being only glued together by the rubber strip, and improve the sealing reliability and heat preservation of the joint area between the cabinet doors.

[0022] 2. By coordinating the housing, door, locking rod, moving sleeve, connecting rod, drive plate, driven plate, and second sealing strip, the compression of the compression spring can be increased, and the contact pressure between the second sealing strip and the sealing ring plate can be increased. This effectively enhances the door frame seal synchronously with the door locking action, solving the problem of weakened sealing force between the door and the door frame after vehicle bumps or door panel deformation, and improving the sealing stability and anti-leakage capability of the door.

[0023] 3. Through the cooperative arrangement between the locking component and the push-pull component, after the lock tongue rotates to the correct position, the positioning hole on the moving plate automatically aligns and engages with the positioning pin, forming a mechanical lock on the extended state of the gear and door strip assembly. At the same time, the limiting plate restricts the unidirectional rotation of the lock tongue, thus locking the lock tongue and gear and preventing back-and-forth swinging that would affect use. In addition, it can lock the door strip assembly, keeping it inside the cabinet door, thus improving the convenience of use.

[0024] 4. Through the coordinated arrangement of the sealing ring plate, the second sealing strip, the recessed part, the raised part, and the heating wire, the second sealing strip, acting as an air bladder, deforms inward when it comes into contact with the raised part, forming multiple sealing barriers. At the same time, the heating wire is embedded in the raised part and wrapped by the insulation plate. Before unloading, it can be heated by electricity to locally and quickly thaw the frozen sealing contact surface, solving the problem that the door and door frame are difficult to open due to freezing in low-temperature environments, thus improving the convenience of opening the door and the efficiency of thawing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the box body located on the vehicle body in this invention; Figure 2 This is a schematic diagram of the box door and rotating rod seat structure in this invention; Figure 3 This is a schematic diagram of the structure of the second sealing strip and sealing ring plate in this invention; Figure 4 This is a schematic diagram of the inner structure of the box door in this invention; Figure 5 This is a schematic diagram of the gear and movable disk structure in this invention; Figure 6 This is a schematic diagram of the connecting rod and drive plate structure in this invention; Figure 7This is a schematic diagram of the locking rod and movable sleeve structure in this invention.

[0026] Figure label: 101. Box body; 102. Box door; 103. Door lock seat; 104. Lock tongue; 105. Rotating rod; 106. Sealing ring plate; 107. Rotating rod seat; 108. Locking rod; 109. Outer handle; 201. Strip frame; 202. First sealing strip; 203. Strip plate; 204. Guide seat; 205. Optical shaft; 206. Gear; 207. Rack; 208. Limiting plate; 209. Support frame; 210. Cavity; 211. 212. Moving plate; 301. Positioning pin; 302. U-shaped frame; 303. L-shaped plate; 304. Second sealing strip; 305. Drive plate; 306. Inclined groove; 307. Conical block; 401. Moving sleeve; 402. Inclined slide groove; 403. Divider plate; 404. Connecting rod; 405. Strip groove; 501. Recess; 502. Protrusion; 503. Heating wire; 504. Insulation board; 505. Sealing sleeve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] The conventional components and key load-bearing components in this case are selected in accordance with standards in terms of material selection, heat treatment process and structural dimensions to ensure that they have sufficient strength, stiffness and fatigue resistance under rated load and expected working conditions. These are all conventional design considerations well known to those skilled in the art.

[0029] Depend on Figures 1 to 7The device includes a housing 101 and doors 102 rotatably connected to the door frame of the housing 101. The housing 101 is mounted on a vehicle body and moved by the vehicle body. Door strip assemblies are provided on opposite sides of the two doors 102. These door strip assemblies can extend outwards. When the doors 102 are closed, the two door strip assemblies contact each other, increasing the sealing of the doors 102. A door lock seat 103 is connected to the outer side of each door 102. A latch 104 is rotatably connected to the door lock seat 103. The latch 104 engages with the door lock seat 103 to restrict the external handle 109. The door lock seat 103 and the latch 104 can be installed together using a lock to prevent accidental opening of the doors 102. Furthermore, the latch 104 and the door lock seat 103 have through holes for lock use; this is a mature existing structure and will not be described in detail here. A rotating rod 105 extending into the interior of the door 102 is connected to the latch 104. One end of the rotating rod 105, located inside the body 101, is connected to a push-pull assembly. This push-pull assembly is connected to the door strip assembly, which drives the door strip assembly. A locking component is located inside the push-pull assembly, restricting both the push-pull assembly and the latch 104 to prevent its back-and-forth movement from affecting usability. Ordinary refrigerated truck doors only have a single rubber strip attached to the door frame, creating a vertical gap between the two doors, which can easily lead to cold leakage. When the two doors 102 are closed, the mutually extending door strip assemblies enhance the stability and sealing of the doors 102.

[0030] The conventional enclosure 101 is sealed by a sealing strip on the door edge to prevent internal cold air leakage. However, due to its weak protective capability, cold air leakage is prone to occur. The following structure enhances the sealing: a sealing ring plate 106 is connected to the inner circumference of the door frame of enclosure 101. A sealing assembly that slides towards the sealing ring plate 106 is slidably connected inside the door 102. The sealing assembly in contact with the sealing ring plate 106 increases the overall sealing performance. A rotating rod seat 107 is installed on the outer side of the door 102. A locking rod 108 is rotatably connected inside the rotating rod seat 107. The rotating rod seat 107 supports the locking rod 108. An external handle 109 is installed on the locking rod 108, facilitating rotation of the locking rod 108. A linkage component is provided outside the locking rod 108 to drive the sealing assembly. When the locking rod 108 is rotated via the external handle 109, the locking rod 108 drives the sealing assembly to move through the linkage component.

[0031] Ordinary refrigerated truck doors have adhesive strips that adhere to the door frame, creating a vertical gap between the two doors. While the adhesive strips can block airflow, cold air leakage is still possible. The following structure improves the sealing between the two doors 102: Specifically, the door strip assembly includes a strip frame 201 and a first sealing strip 202 connected to one side of the strip frame 201. A strip plate 203 is slidably connected inside the strip frame 201 and fixedly connected to the inside of the door 102. The strip plate 203 and the strip frame 201 are connected by a spring. When the two doors 102 are closed, the door strip assembly between them moves towards each other, sealing the gap and reducing cold air leakage. Furthermore, the spring between the strip plate 203 and the strip frame 201 compresses the two first sealing strips 202, further enhancing the sealing performance.

[0032] Because the first sealing strip 202 extends outward under the action of the spring, it will undoubtedly increase the width of the box door 102, which will not only affect the handling of goods, but also easily cause damage to the first sealing strip 202. The following provides a structure for protecting the first sealing strip 202: Specifically, the strip plate 203 is movable inside the box door 102. A guide seat 204 is connected inside the box body 101, and an optical shaft 205 is slidably connected inside the guide seat 204. One end of the optical shaft 205 is connected to the strip plate 203. In one embodiment, the optical shaft 205 is a guide rail structure, which, like the optical shaft 205, guides the strip plate 203. The guide seat 204 and the strip plate 203 are connected by a spring, and one end of the optical shaft 205 is externally connected to a telescopic drive device that pushes the optical shaft 205 to move. When the door 102 is closed, the telescopic drive device is activated, extending the strip plate 203 outward via the optical axis 205. At this time, the first sealing strip 202 extends from one side of the door 102 to seal the gap between the two doors 102. When the door 102 is opened, the telescopic drive device retracts, causing the door strip assembly to retract into the door 102, reducing the width of the door 102.

[0033] Since the door 102 is connected to the box body 101 via a hinge, and there is no circuit structure inside the door 102, it is not convenient to install an electrically controlled telescopic drive device inside the door 102. The following provides a structure where the optical shaft 205 is manually driven to move after the door 102 is closed: Specifically, the push-pull assembly includes a gear 206 connected to one end of the rotating rod 105. When the latch 104 rotates, the rotating rod 105 drives the gear 206 to rotate. One end of one of the optical shafts 205 is connected to a rack 207 that meshes with the gear 206. When the gear 206 rotates, it drives the optical shaft 205 to move axially through meshing with the rack 207. The door lock latch seat 103 is provided with a limiting plate 208 that restricts the rotation angle of the latch 104. The limiting plate 208 restricts the latch 104, allowing it to rotate only in one direction. (Reference) Figure 1 In the enlarged view, the outer handle 109 of the left door 102 is located inside the door lock seat 103. When it is necessary to unlock the locking lever 108, the locking tongue 104 is rotated counterclockwise. The locking tongue 104 drives the gear 206 inside the door 102 to rotate clockwise via the rotating rod 105. The rotating gear 206 causes the optical axis 205 to move inward toward the box body 101 via the rack 207. At this time, the door strip assembly retracts into the box body 101, and the limiting plate 208 restricts the locking tongue 104, allowing it to rotate only counterclockwise. The right door 102 is the opposite of the left. A support frame 209 is connected inside the box body 101 to support the gear 206.

[0034] The rotation of the latch 104 drives the gear 206 to rotate. Since the optical shaft 205 has a spring structure, the door strip assembly is in the extended state when not under force. Therefore, a structure is needed to restrict the gear 206 to prevent the door strip assembly from being extended by the spring and causing the latch 104 to rotate when the door 102 is opened. The following provides a result of restricting the gear 206: Specifically, a cavity 210 is formed on the side of the gear 206 near the door lock seat 103. An external spline is formed on the end of the rotating rod 105 near the gear 206. The rotating rod 105 is splined and connected to the inside of the gear 206. A support frame 209 supports the gear 206. A movable disk 211 located within the cavity 210 is connected to the outside of the rotating rod 105. The movable disk 211 and the cavity 210 are connected by a spring. The rotating rod 105 is slidably connected within the door lock seat 103. The locking lever 105 and the movable disk 211 can be axially moved within the gear 206 by pressing the latch 104, thereby unlocking the door. A positioning pin 212 is installed on the side of the door lock seat 103 near the movable disk 211, and the movable disk 211 has a positioning hole corresponding to the positioning pin 212. When unlocking the locking lever 108, rotating the latch 104 allows the outer handle 109 to be removed from the door lock seat 103, thus unlocking the locking lever 108. When the latch 104 rotates, the positioning hole on the movable disk 211 aligns with the positioning pin 212. Under the action of the spring, the movable disk 211 fits against the door lock seat 103, and the positioning pin 212 is inserted into the positioning hole to position the movable disk 211. Simultaneously, the gear 206 restricts movement, ensuring the door strip assembly remains inside the door 102. When unlocking, press the latch 104. At this time, the movable disc 211 will disengage from the door lock seat 103, and the positioning pin 212 will come out from the positioning hole. At this time, the latch 104 and the movable disc 211 will lose their restraining effect and can be rotated.

[0035] There is an assembly gap between the door 102 and the door frame of the box body 101. Vehicle vibrations and slight deformation of the door panel can widen this gap, affecting the overall sealing performance. Especially during transport on bumpy roads, the vibration of the door 102 increases, further impacting the sealing effect. Specifically, a U-shaped frame 301 is installed inside the door 102. The U-shaped frames 301 of the two doors 102 are arranged facing each other, meaning the opening of the U-shaped frame 301 faces the other door 102, corresponding to the door frame. When the two doors 102 are closed, the two U-shaped frames 301 correspond to the sealing ring plate 106. Symmetrically arranged L-shaped plates 302 are slidably connected inside the U-shaped frame 301, and the two L-shaped plates 302 are horizontally symmetrical. The sealing assembly includes a second sealing strip 303 connected to one side of the L-shaped plate 302. The L-shaped plate 302 and the U-shaped frame 301 are connected by a spring. When the door 102 is closed, the second sealing strip 303 contacts the sealing ring plate 106, thereby increasing the sealing performance. The sealing ring plate 106 forms a water-proof step, and the second sealing strip 303 forms a sealed water-proof layer after pressing against the edge. Even if rainwater or car wash water passes through the outer surface gaps, it will be blocked by the second sealing strip 303 and cannot seep into the cargo area. At the same time, it isolates humid air, preventing condensation and moisture on the inner walls and cargo. Furthermore, it blocks the inflow of external hot air and the leakage of cold air from the compartment, reducing cold loss, stabilizing the temperature control inside the compartment, and reducing refrigeration energy consumption.

[0036] When the door 102 is closed, the second sealing strip 303 is pressed against the sealing ring plate 106 by the spring inside the U-shaped frame 301. When the vehicle shakes, the spring force weakens, affecting the sealing performance. The following provides a structure to increase the clamping force when the door 102 is closed: Specifically, a driven plate 304 is slidably connected inside the U-shaped frame 301, and the driven plate 304 and the L-shaped plate 302 move in the same direction. Symmetrically arranged drive plates 305 are slidably connected inside the door 102, and the drive plates 305 move vertically. Two drive plates 305 move towards each other. The driven plate 304 has equally spaced inclined grooves 306 on its side facing the drive plate 305. A conical block 307 corresponding to the inclined groove 306 is connected to the drive plate 305. When the drive plate 305 moves towards the L-shaped plate 302, the conical block 307 on the drive plate 305 contacts the inclined groove 306, causing the driven plate 304 to slide within the U-shaped frame 301. At this time, the spring between the L-shaped plate 302 and the driven plate 304 is compressed, increasing the pressure when the second sealing strip 303 contacts the sealing ring plate 106, thus improving the sealing capability. A telescopic structure is connected to one side of the driven plate 304 to drive its movement. This telescopic structure drives the two drive plates 305 to move in opposite directions.

[0037] refer to Figure 6 and Figure 7When the telescopic structure drives the drive plate 305 to move upward, the conical block 307 on the drive plate 305 contacts the inclined groove 306, causing the driven plate 304 to move within the U-shaped frame 301, increasing the compression of the spring between the L-shaped plate 302 and the driven plate 304.

[0038] Since there is no wiring structure inside the door 102, it is inconvenient to install a telescopic structure to drive the two drive plates 305 to move. The following provides a structure that does not require electricity to drive the two drive plates 305 to move: Specifically, the linkage component includes a movable sleeve 401 sleeved outside the locking rod 108. The movable sleeve 401 is located inside the rotating rod seat 107, which guides and protects the movable sleeve 401. An oblique groove 402 is formed on the outer wall of the locking rod 108. A sliding pin located within the oblique groove 402 is connected to the inner annular surface of the movable sleeve 401. When the locking rod 108 rotates, the movable sleeve 401 within the rotating rod seat 107 moves up and down. A partition plate 403 is connected inside the housing 101, separating the push-pull component and the linkage component. A connecting rod 404 is rotatably connected to the partition plate 403. The connecting rod 404 has a long end and a short end, and the rotation axis is located at the bend. The short rod of the connecting rod 404 is slidably connected to the drive plate 305, and a strip groove 405 is formed on the long rod of the connecting rod 404. A movable pin located in the strip groove 405 is connected to the outer wall of the movable sleeve 401. When the movable sleeve 401 moves up and down, the connecting rod 404 rotates through the sliding pin located in the strip groove 405. Through the lever-saving structure, the short end of the connecting rod 404 pushes the drive plate 305 upward. The outer side of the door 102 is provided with symmetrically arranged rotating rod seats 107 and linkage components, thereby driving the symmetrically arranged drive plates 305 to move.

[0039] After prolonged use at low temperatures, the low-temperature gas inside the enclosure 101 can easily freeze the door 102 and door frame. The conventional method of thawing is to pour boiling water, which is not only inefficient but also makes it difficult to reach inside for thawing. The following structure facilitates thawing: Specifically, the sealing ring plate 106 has a recess 501 on the side near the second sealing strip 303. A protrusion 502 is located within the recess 501. The second sealing strip 303 is a hollow airbag. When the second sealing strip 303 contacts the protrusion 502, it creates an inward indentation, reducing gas leakage and increasing overall sealing. A heating wire 503 is installed inside the protrusion 502. The heating wire 503 is connected to an external power supply device. Since the heating wire 503 is located on the enclosure 101, it is easy to connect an external power supply device via cable. An insulation plate 504, which wraps around the heating wire 503, is connected to one side of the sealing ring plate 106. When it is necessary to defrost the connection between the door 102 and the body 101, the heating wire 503 is activated to heat the connection between the door 102 and the body 101, thereby defrosting and making it easier to open the door.

[0040] The outer ring surface of the box door 102 is also fitted with a sealing sleeve 505 to increase the sealing performance. This is an existing and mature structure, and will not be described in detail here.

[0041] When using this invention, goods are placed inside the box 101, and then the box door 102 is closed. The locking rod 108 is rotated, and the lock heads at both ends of the locking rod 108 will contact the lock seat, thereby completing the closure of the box door 102. The second sealing strip 303 on one side of the box door 102 contacts the sealing ring plate 106 to increase the sealing performance.

[0042] When the outer handle 109 is rotated into the door lock seat 103, the lock rod 108 causes the moving sleeve 401 to move axially through the inclined slide groove 402. The moving sleeve 401 drives the connecting rod 404 to rotate. The rotating connecting rod 404 causes the drive plate 305 to move towards the driven plate 304. At this time, the spring between the driven plate 304 and the L-shaped plate 302 is compressed, increasing the contact between the second sealing strip 303 and the sealing ring plate 106.

[0043] Rotate the latch 104 so that it corresponds to the door lock seat 103. The latch 104 drives the gear 206 to rotate through the rotating rod 105. The gear 206 causes the door strip assembly to extend outward through the rack 207. The door strip assemblies of the two boxes 102 extend into each other and contact each other, which increases the sealing between the boxes 102.

[0044] During unloading, the heating element 503 is activated to prevent the connection between the second sealing strip 303 and the sealing ring plate 106 from freezing. Then, the locking tongue 104 is rotated to release the restriction on the external handle 109. The rotation of the locking tongue 104 causes the door strip assembly to retract into the box door 102. After opening the box door 102, the unloading operation is completed.

[0045] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A protective device for a refrigerated truck compartment, comprising a compartment body (101) and a door (102) rotatably connected to the door frame of the compartment body (101), characterized in that: Door strip assemblies are provided on opposite sides of the two cabinet doors (102). When the two door strip assemblies come into contact with each other, the sealing performance of the cabinet doors (102) is increased. A door lock seat (103) is connected to the outside of the cabinet doors (102). A lock tongue (104) is rotatably connected to the door lock seat (103). A rotating rod (105) extending into the cabinet door (102) is connected to the lock tongue (104). A push-pull assembly is connected to one end of the rotating rod (105) inside the cabinet body (101). The push-pull assembly is connected to the door strip assembly. The push-pull assembly drives the door strip assembly to move. A locking assembly is provided inside the push-pull assembly. The locking assembly restricts the push-pull assembly. A sealing ring plate (106) is connected to the inner ring surface of the door frame of the box body (101). A sealing component that moves toward the sealing ring plate (106) is slidably connected inside the box door (102). The sealing component that contacts the sealing ring plate (106) increases the overall sealing performance. A rotating rod seat (107) is installed on the outside of the box door (102). A locking rod (108) is rotatably connected inside the rotating rod seat (107). A linkage component that drives the sealing component to move is provided outside the locking rod (108).

2. The protective device for refrigerated truck compartments according to claim 1, characterized in that: The door strip assembly includes a strip frame (201) and a first sealing strip (202) connected to one side of the strip frame (201). A strip plate (203) is slidably connected inside the strip frame (201). The strip plate (203) and the strip frame (201) are connected by a spring. The two door panels (102) are sealed by sealing strips extending in opposite directions.

3. The protective device for refrigerated truck compartments according to claim 2, characterized in that: The housing (101) is internally connected to a guide seat (204), and an optical shaft (205) is slidably connected inside the guide seat (204). One end of the optical shaft (205) is connected to a strip plate (203). The guide seat (204) and the strip plate (203) are connected by a spring. One end of the optical shaft (205) is externally connected to a telescopic drive device that pushes the optical shaft (205) to move.

4. The protective device for refrigerated truck compartments according to claim 3, characterized in that: The push-pull assembly includes a gear (206) connected to one end of a rotating rod (105), one end of one of the optical shafts (205) is connected to a rack (207) that meshes with the gear (206), a limiting plate (208) is provided on the door lock seat (103) to limit the rotation angle of the lock tongue (104), and a support frame (209) for supporting the gear (206) is connected inside the housing (101).

5. The protective device for refrigerated truck compartments according to claim 4, characterized in that: The gear (206) has a cavity (210) on the side near the door lock seat (103). The rotating rod (105) has an external spline on the end near the gear (206). The rotating rod (105) is splined and connected to the inside of the gear (206). The rotating rod (105) is connected to a movable disk (211) located in the cavity (210). The movable disk (211) and the cavity (210) are connected by a spring. The door lock seat (103) has a positioning pin (212) installed on the side near the movable disk (211). The movable disk (211) has a positioning hole corresponding to the positioning pin (212).

6. The protective device for refrigerated truck compartments according to claim 1, characterized in that: The box door (102) is equipped with a U-shaped frame (301) inside, and symmetrically arranged L-shaped plates (302) are slidably connected inside the U-shaped frame (301). The sealing assembly includes a second sealing strip (303) connected to one side of the L-shaped plate (302). The L-shaped plate (302) and the U-shaped frame (301) are connected by a spring. The second sealing strip (303) increases the sealing performance after contacting the sealing ring plate (106).

7. The protective device for refrigerated truck compartments according to claim 6, characterized in that: A driven plate (304) is slidably connected inside the U-shaped frame (301), and a symmetrically arranged drive plate (305) is slidably connected inside the box door (102). The two drive plates (305) move towards each other. An equally spaced inclined groove (306) is opened on the side of the driven plate (304) facing the drive plate (305). A conical block (307) corresponding to the inclined groove (306) is connected on the drive plate (305). A telescopic structure that drives the driven plate (304) to move is connected to one side of the driven plate (304).

8. The protective device for refrigerated truck compartments according to claim 7, characterized in that: The linkage assembly includes a movable sleeve (401) sleeved outside the locking rod (108). An oblique groove (402) is provided on the outer wall of the locking rod (108). A sliding pin located in the oblique groove (402) is connected to the inner ring surface of the movable sleeve (401). A partition plate (403) is connected inside the housing (101). A connecting rod (404) is rotatably connected to the partition plate (403). The short rod of the connecting rod (404) is slidably connected to the drive plate (305). A strip groove (405) is provided at the long rod of the connecting rod (404). A movable pin located in the strip groove (405) is connected to the outer wall of the movable sleeve (401).

9. The protective device for refrigerated truck compartments according to claim 1, characterized in that: The sealing ring plate (106) has a recess (501) on the side near the second sealing strip (303), and a protrusion (502) is provided in the recess (501). An electric heating wire (503) is installed in the protrusion (502). The second sealing strip (303) is a hollow air bag. A heat insulation plate (504) that wraps the electric heating wire (503) is connected to one side of the sealing ring plate (106).

10. A protective method for refrigerated truck compartments, characterized in that, Using a protective device for a refrigerated truck compartment according to any one of claims 1 to 9 includes the following steps: S1. Loading: After the goods are placed into the box (101), close the box door (102). Rotate the locking rod (108) through the outer handle (109) to complete the closing of the box door (102). The second sealing strip (303) on one side of the box door (102) comes into contact with the sealing ring plate (106). S2. Increase protection between the door (102) and the box body (101): When the outer handle (109) is rotated into the door lock seat (103), the linkage component on the outer wall of the lock rod (108) causes the driven plate (304) to move. The compressed spring increases the contact between the second sealing strip (303) and the sealing ring plate (106), thereby increasing the sealing performance. S3. Increase protection between the cabinet doors (102): Rotate the latch (104) so ​​that it corresponds to the door lock seat (103). The latch (104) causes the door strip assembly to extend outward through the locking component. The door strip assemblies of the two cabinet doors (102) extend into each other and contact each other, which increases the sealing between the cabinet doors (102). S4. Unlocking: When unloading, start the heating wire (503) to prevent the door (102) from freezing to the box body (101). Then rotate the locking tongue (104) to release the restriction on the external handle (109). The rotating locking tongue (104) causes the door strip assembly to retract into the door (102). After opening the door, the unloading action is completed.

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