Commercial refrigerator airtightness detection equipment

Abstract

The application discloses a kind of commercial refrigerator airtightness detection equipment, it is related to airtightness detection technical field, including frame body, bottom plate, unwinding assembly, traction assembly;The unwinding assembly is installed at the top of frame body, for releasing and winding sealing film, including unwinding roller and fixing piece, the central shaft of unwinding roller is rotatably connected with fixing piece, and the inner end of coil spring is fixedly connected on main shaft, and the outer end of coil spring is fixedly connected with fixing piece;The traction assembly includes lifting mechanism installed on the top of frame body and lifting frame installed on the movable end of lifting mechanism.The application indirectly detects the airtightness of cabinet door and cabinet body by setting alternative means, specifically by forming airtight space with the cabinet door through the sealing film and vacuumizing, the overall airtightness of refrigerator can be indirectly reflected, without plugging the complex channel inside the refrigerator, greatly simplifying the operation process, without stopping or disassembling parts, without affecting the normal refrigeration and goods storage of refrigerator, meet the needs of commercial refrigerator maintenance without stopping.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air tightness detection, and particularly relates to a commercial refrigerator air tightness detection device. BACKGROUND

[0002] The air tightness of a commercial refrigerator, as one of its core technical indicators, has a decisive influence on the overall performance and actual application value of the equipment: it is not only the key to ensuring the stability of the refrigeration and cold preservation effect and prolonging the service life of the equipment, but also directly related to the quality safety and shelf life of the stored goods. Specifically, the advantages and disadvantages of air tightness will directly affect the stability of the temperature and humidity inside the refrigerator. If the air tightness is poor, the cold air is easy to leak, causing the temperature and humidity in the warehouse to fluctuate beyond the safe range, and then accelerating the deterioration of fresh food, beverages and other goods, causing economic losses. Therefore, whether in the production and manufacturing link or in the daily maintenance process, the air tightness detection of a commercial refrigerator is an indispensable key link, especially in the production line scene, it is necessary to avoid the problem of cold air leakage caused by sealing defects through strict detection to ensure that the equipment has qualified use performance when it leaves the factory.

[0003] The current conventional detection methods for the air tightness of a commercial refrigerator mainly include three types of differential pressure method, leak detector method and colored smoke method. Among them, the differential pressure method and the leak detector method both take pressure change as the core judgment basis: by monitoring the rising and falling trend of the pressure inside the refrigerator, it can be preliminarily judged whether there is a sealing defect, but both methods have the same limitation - only qualitative judgment of "whether there is leakage" can be achieved, and the specific leakage position cannot be directly located, which brings inconvenience to subsequent fault troubleshooting and repair. In comparison, the colored smoke method has more advantages in detection function, which can not only judge whether the air tightness is qualified, but also determine the leakage point through visual means. Its typical detection process is: first, seal the air outlet of the refrigerator, then inject colored gas into the interior of the refrigerator through the air inlet, and finally observe whether the gas leaks from the surface of the equipment and record the leakage position. However, this method still has obvious shortcomings in actual operation: the air inlet of the refrigerator is usually arranged on the outer surface of the equipment, and is mostly in the form of a strip-shaped air inlet grille structure. This design makes it difficult for the detection pipeline to be tightly connected with the air inlet, and the injected colored gas is easy to leak from the joint gap, directly interfering with the accuracy of the detection result and affecting the reliability of the air tightness judgment.

[0004] To solve the above-mentioned docking problem of colored smoke method, the Chinese invention patent with publication number CN118408695B discloses a commercial refrigerator airtightness detection equipment, which is recorded as: "including a connecting box connected to the air inlet of the refrigerator, the connecting box is provided with an airtightness detector, further including a mounting mechanism and a connecting mechanism. The invention sets up the mounting mechanism and the connecting mechanism, inserts the columnar block into the air inlet, rotates the block to move the columnar block, and clamps the side wall of the air inlet from the inside and outside by the clamping plate and the connecting box. Since the connecting box is pressed against the outer wall of the refrigerator, the sealing ring tightly contacts the surrounding outer wall of the air inlet at this time, which can realize the sealing installation of the connecting box and the commercial refrigerator; then the connecting mechanism is used to connect the connecting port and the connecting pipe; when detecting, the connecting pipe injects colored gas into the connecting box through the connecting port, and the air pressure is detected by the airtightness detector to determine whether leakage occurs, which is convenient for installing the connecting box at the air inlet and convenient for airtightness detection of the refrigerator". But this scheme still has significant deficiencies in practical application: first, commercial refrigerators usually have multiple functional channels (such as drain holes or pressure balance holes for easy opening) connected to the external environment, and the connecting ports of different types of refrigerators have obvious differences in position and size, which requires the channels to be sealed one by one before detection. The operator not only has to spend extra time finding the positions of the channels, but some channels may be hidden in the dead angle area of the refrigerator, further increasing the difficulty and time consumption of the sealing operation; secondly, this scheme cannot carry out detection under normal working condition of the refrigerator, if the refrigerator has airtightness related fault during operation, it needs to be stopped for channel sealing and detection operation, and there are goods in the refrigerator, which need to be cleared one by one to create space for detection, which cannot meet the demand of fault diagnosis of the equipment during operation, and the application scene has obvious limitations. SUMMARY

[0005] The purpose of the present application is to provide a commercial refrigerator airtightness detection equipment to solve the problem that the prior art cannot detect during the operation of the refrigerator.

[0006] To solve the above-mentioned technical problems, the technical scheme adopted by the present application is:

[0007] The utility model provides a kind of commercial refrigerator airtightness detection equipment, including frame body;Further include: bottom plate;Unwinding assembly, is installed to the top of frame body, for releasing and winding sealing film, including unwinding roller and fixed part, the central axis of unwinding roller is rotatably connected with fixed part, and the inner end of coil spring is fixedly connected on main shaft, and the outer end of coil spring is fixedly connected with fixed part;Traction assembly, including lifting mechanism installed on the top of frame body and lifting frame installed on the movable end of lifting mechanism, one side of lifting frame is fixedly connected with positioning mechanism, and positioning mechanism is used to fix the head of sealing film;Lifting frame one side is fixedly connected with pressing plate, and connecting head is detachably connected on pressing plate;Steering assembly, including roller frame and steering roller rotatably connected in the inner side of roller frame, the side of steering roller away from unwinding assembly is flush with one side of positioning mechanism;Vacuumizing device is used to vacuumize connecting head;Adapter assembly is detachably connected on pressing plate and is connected with connecting head, and the airtightness of the surface of commercial refrigerator is detected by forming airtight space with the surface of commercial refrigerator;Mounting assembly, frame body is connected on the top of bottom plate by mounting assembly, and mounting assembly is used to control the activity of frame body, and sealing film is fixed with commercial refrigerator.

[0008] Adopt the technical scheme, can focus on the core influence part of commercial refrigerator airtightness accurately, i.e. the door and the sealing strip around the door, form airtight space with the door through sealing film and detect by vacuumizing, can indirectly reflect the overall airtightness of refrigerator, without blocking the complex channel in the refrigerator, greatly simplify the operation process;At the same time, in the unwinding process of sealing film, it can be straightened by relying on the coil spring of unwinding assembly, and after detection, it can also be wound back to its original position, by controlling the unwinding amount of sealing film to adapt to different sizes of refrigerator, without customizing detection tooling for single refrigerator, and support detection under working condition, without stopping or disassembling parts, without affecting normal refrigeration and goods storage, meet the needs of commercial refrigerator maintenance without stopping.

[0009] Further improvements of the technical scheme of the present application are as follows: the adapter assembly comprises a docking plate, one side of the docking plate is fixedly connected with a docking head, the side away from the docking head is fixedly connected with a rotary joint, the rotary joint is communicated with the docking head through a pipeline, one end of the rotary joint away from the docking plate is fixedly connected with a Z-shaped pipe, one end of the Z-shaped pipe away from the rotary joint is fixedly connected with a suction head, one side of the suction head away from the Z-shaped pipe is fixedly connected with a sealing gasket forming a rectangular closed loop, and a plurality of suction holes communicating with the inside of the suction head are formed on the side, and the Z-shaped pipe communicates with the inside of the suction head; a motor is fixedly installed at the bottom of the docking plate, the output end of the motor is fixedly connected with a driving gear, a driven gear is fixedly connected to the outer wall of one end of the rotary joint close to the Z-shaped pipe, the driving gear is engagedly connected with the driven gear, and a sealing ring is fixedly connected to the side of the docking head away from the docking plate; the docking plate is detachably connected with the pressing plate through the clamping mechanism.

[0010] By adopting the above technical scheme, the smoothness of the refrigerator itself can be detected by setting the adapter assembly, and through the detection, the cooperation degree of the refrigerator itself and the sealing strip can be reflected, and the problem of affecting the evaluation result of the sealing strip caused by the surface defects of the refrigerator can be reduced; the rectangular closed loop sealing gasket of the suction head cooperates with the suction hole to accurately form a local closed space, the smoothness of the refrigerator surface can be judged by observing the adsorption state through vacuumizing, and then the air tightness cooperating with the sealing strip can be reflected, the detection precision is high, and the overall structure can adapt to the detection needs of different models of refrigerators without additional adjustment to cover the key areas such as the corners and edges of the door.

[0011] Further improvements of the technical scheme of the present application are as follows: the positioning mechanism comprises a second screw rod symmetrically and rotatably connected to the side wall of the pressing plate, a pressing piece is threadedly connected to the outside of the second screw rod, the pressing piece is L-shaped, and a rubber pad is attached to the head portion; the connecting head comprises a docking portion and a locking portion, a through hole is formed in the pressing plate, the locking portion passes through the through hole and is threadedly connected with a locking cap, a sealing ring is fixedly connected to the side of the locking cap close to the pressing plate, and a sealing ring is also arranged on the side of the docking portion close to the pressing plate; the top of the pressing plate is provided as a circular arc, and the blocking film is provided with an opening at a position opposite to the through hole; one end of the locking portion is detachably connected with a tee joint, one end of the tee joint is connected with a pressure gauge, and the other end is communicated with the vacuumizing device through a pipeline.

[0012] By adopting the above technical scheme, the positioning mechanism is provided, and the design of driving the pressing piece by the second screw rod can stably fix the blocking film through the rubber pad and quickly unlock to realize replacement of the blocking film, so that the detection error caused by wear of the blocking film is avoided, the accuracy of long-term detection is ensured, the locking cap of the connecting head cooperates with the sealing ring to ensure that the vacuumizing channel is sealed reliably, the tee joint integrates the pressure gauge and the vacuumizing interface to simplify the equipment connection process without additional external instruments, the replacement mode of the blocking film is flexible, the wear section can be cut as needed or the whole roll can be replaced, the cost of consumables is reduced, and the blocking film can be adapted to different thicknesses of soft PVC film.

[0013] Further improvement of the technical scheme of the present application is that the lifting mechanism comprises first lifting cylinders fixedly connected symmetrically on the top of the frame body, first piston plates slidingly connected between the inner walls of the first lifting cylinders, second lifting cylinders fixedly connected on the top of the first piston plates, second piston plates slidingly connected between the inner walls of the second lifting cylinders, top rods fixedly connected on the top of the second piston plates, the top of the top rods being fixedly connected with the lifting frame, guide holes being formed in the middle of the first piston plates, two first lifting cylinders being communicated through a through pipe, the through pipe being communicated with an external air source through an input pipe, a one-way valve being arranged in the input pipe, limit rings being fixedly connected on the top of the first lifting cylinders and the second lifting cylinders, two air release pipes being symmetrically arranged on the bottom of the through pipe, electromagnetic valves being arranged in the middle of the air release pipes, and one-way valves being arranged in the air release pipes.

[0014] By adopting the above technical scheme, the lifting structure with multiple pistons can realize a large lifting stroke, adapt to the detection requirements of refrigerators of different heights, shrink in volume during transfer, facilitate equipment transportation and storage, save transportation and storage space, and is especially suitable for on-site detection or multi-site circulation use. The symmetrically distributed first lifting cylinders ensure that the lifting frame is uniformly stressed, avoid misalignment of the sealing film caused by tilting, the limit rings prevent the piston plates from coming out, and the one-way valves ensure that the lifting frame is stable when the air source is interrupted, thereby improving the safety of the equipment in use.

[0015] Further improvement of the technical scheme of the present application is that the steering assembly further comprises a portal frame fixedly connected on the top of the frame body, a third screw threadedly connected on the top of the portal frame, a lifting plate rotatably connected on the bottom of the third screw extending below the portal frame, two guide rods symmetrically slidingly connected on the top of the portal frame, the bottom of the two guide rods extending below the portal frame and being fixedly connected with the lifting plate, and a roller frame fixedly connected on one side of the lifting plate.

[0016] By adopting the above technical scheme, the steering assembly is provided as a height-adjustable structure, the position of the steering roller can be accurately adjusted through cooperation of the screw and the guide rod, the height of the door of the refrigerator of different sizes can be adapted, and the height of the lower part of the door plate is not the same due to the size difference of the refrigerator, so as to ensure the flatness and sealing performance of the film during detection. By rotating the third screw, the lifting plate rotatably connected on the bottom is driven to slide along the guide rod, and the guide rod prevents the lifting plate from rotating and deviating. The roller frame fixed on one side of the lifting plate rises and falls synchronously with the lifting plate, thereby adjusting the height of the steering roller until the steering roller corresponds to the position of the sealing strip below the door, so that the sealing film can be perfectly attached to the sealing strip of the door in the subsequent attachment process.

[0017] Further improvement of the technical scheme of the present application is that two air blowers are symmetrically arranged on one side of the frame body and are communicated with the air outlet pipe; two horizontal frames are symmetrically fixed on one side of the gantry frame, and a cleaning roller is rotatably connected between the two sides of the two horizontal frames; a plurality of cleaning cloths are radially and equidistantly arranged on the outer part of the cleaning roller; and the central shaft of the cleaning roller is drivingly connected with the central shaft of the unwinding roller through a belt and a belt pulley.

[0018] The above technical scheme provides double protection through the pre-cleaning of the air blower and the wiping cleaning of the cleaning roller, and completely removes the impurities on the surface of the sealing film.

[0019] Further improvement of the technical scheme of the present application is that an electromagnetic latch is fixedly installed on the side of the docking plate close to the rotary joint, and four insertion holes are equidistantly formed in the driven gear, and the electromagnetic latch is used in cooperation with the insertion holes.

[0020] The above technical scheme can realize the precise positioning of the suction head at the key angle through the cooperation of the electromagnetic latch and the insertion holes of the driven gear, can release the locking state of the motor output shaft during detection, avoids damage caused by continuous load when the motor stops, resists vibration interference during the operation of the refrigerator, avoids detection errors caused by angle deviation, and ensures the consistency of the detection position.

[0021] Further improvement of the technical scheme of the present application is that the mounting assembly comprises two cylindrical grooves symmetrically formed on one side of the bottom plate, two communication grooves symmetrically formed on the other side of the bottom plate and communicated with the cylindrical grooves, a columnar block with the same shape as the end face of the cylindrical groove arranged in the cylindrical groove, the columnar block abutting the inner wall of the cylindrical groove, a square rod fixedly connected to one side of the columnar block, the square rod extending to the outside of the bottom plate through the communication groove and fixedly connected with a swing rod, two synchronous wheels rotatably connected to one side of the bottom plate, the two synchronous wheels drivingly connected through a synchronous belt, a square groove penetrating through both ends formed on the central shaft of each of the two synchronous wheels, and the square rod slidingly connected with the square groove; a plurality of clamping grooves are formed in the four side walls of the square rod, a spring latch structure is arranged on the bottom plate and used in cooperation with the clamping grooves; a strip-shaped groove is formed in the top of the bottom plate, a fourth screw rod is rotatably connected in the strip-shaped groove, an adjusting block is threadedly connected to the outer part of the fourth screw rod, the adjusting block slidingly connected with the strip-shaped groove, the top of the adjusting block fixedly connected with the frame body, and one end of the fourth screw rod extending to the outside of the bottom plate and fixedly connected with a handle.

[0022] The above technical scheme can simply fix the frame body and the freezer door through the positioning mechanism, form a basic limit for the sealing film, and thus restrain the sealing film, so as to avoid the problem that the sealing film cannot be adsorbed due to the gap between the sealing film and the door during the detection process.

[0023] The further improvement of the technical scheme of the present application is that the sealing film is a soft PVC film with a thickness of 2-5 mm.

[0024] By adopting the above technical scheme, the balance between flexibility and strength of the 2-5 mm soft PVC film is adopted, which can closely fit the shape of the cabinet door of different types of refrigerators and resist the negative pressure deformation during vacuumizing, thereby ensuring the sealing property of the sealed space and improving the detection accuracy.

[0025] Due to the adoption of the above technical scheme, the present application has the following technical effects compared with the prior art:

[0026] 1. The present application provides a commercial refrigerator air tightness detection device, which indirectly detects the air tightness of the cabinet door and the cabinet body by setting a replacement means, specifically forms a sealed space with the cabinet door by the sealing film and performs vacuumizing, thereby indirectly reflecting the overall air tightness of the refrigerator, without the need to seal the complex channels inside the refrigerator, greatly simplifying the operation process, without the need to stop the machine or disassemble the parts, without affecting the normal refrigeration and product storage of the refrigerator, and meeting the needs of non-stop maintenance of the commercial refrigerator; during detection, whether the air tightness is qualified can be quickly judged through the change of negative pressure, the leakage point can be accurately located by combining the soapy water or colored smoke, and the surface smoothness of the joint part of the cabinet door and the sealing strip can be detected through the adapter assembly, so that the function is flexible and comprehensive, and the reliability and practicality of the detection result can be effectively guaranteed.

[0027] 2. The present application provides a commercial refrigerator air tightness detection device, which controls the unwinding amount of the unwinding assembly to adapt to different sizes of refrigerators, without the need to customize detection tools for a single refrigerator, thereby improving the universality of the detection device, the unwinding assembly of the device comprises an unwinding roller and a fixing piece, the unwinding roller is rotatably connected to the fixing piece by means of a center shaft, and the inner end and the outer end of the coil spring are fixed on the main shaft and stably connected to the fixing piece, so that the unwinding length can be flexibly adjusted according to the size of the cabinet door of the refrigerator, and the complete coverage of the detection area by the fitting film is ensured in cooperation with the steering assembly; compared with the traditional detection method which needs to customize tools for different refrigerators, there is no need to additionally reserve multiple specifications of accessories, thereby simplifying the operation and greatly improving the adaptation range.

[0028] 3. The present application sets a positioning mechanism and utilizes the design of the second screw driving the pressing piece, which can stably fix the sealing film by the rubber pad and quickly unlock to realize the replacement of the sealing film, so that the operation is convenient, the detection error caused by the wear of the sealing film is avoided, and the accuracy of long-term detection is ensured; the locking cap of the connecting head cooperates with the sealing ring to ensure the reliable sealing of the vacuumizing channel, the three-way pipe joint integrates the pressure gauge and the vacuumizing interface, thereby simplifying the connection process of the equipment and without the need to externally connect the instrument; the replacement mode of the sealing film is flexible, which can cut off the worn section or replace the whole coil as needed, thereby reducing the cost of consumables and also adapting to different thicknesses of soft PVC films.

[0029] 4. The application can realize larger lifting stroke, adapt to the detection needs of refrigerators of different heights, shrink in volume during transfer, facilitate equipment transportation and storage, save transportation and storage space, and is especially suitable for on-site detection or multi-site circulation.

[0030] 5. The application forms double protection through the pre-cleaning of the air blowing nozzle and the wiping cleaning of the cleaning roller, completely removes the impurities on the surface of the blocking film, and the air blowing nozzle is communicated with the air exhaust pipe, so that when the electromagnetic valve is turned on (when the lifting mechanism is lowered), the air discharged from the air blowing nozzle is blown out, thereby blowing off the dust on the blocking film. BRIEF DESCRIPTION OF DRAWINGS

[0031] The application will be further described below with reference to the accompanying drawings.

[0032] Figure 1 is a schematic diagram of the overall first perspective structure of the application;

[0033] Figure 2 is a schematic diagram of the first perspective structure during the detection process of the application;

[0034] Figure 3 is a schematic diagram of the second perspective structure during the detection process of the application;

[0035] Figure 4 is a schematic diagram of the overall second perspective structure of the application;

[0036] Figure 5 is a schematic diagram of the overall structure of the application in the state of installing the adapter assembly;

[0037] Figure 6 is a schematic diagram of the cross-sectional structure of the overall lifting mechanism of the application;

[0038] Figure 7 is a schematic diagram of the structure of the frame body and the unwinding assembly of the application;

[0039] Figure 8 is a schematic diagram of the external structure of the bottom plate of the application;

[0040] Figure 9 is a schematic diagram of the cross-sectional structure of the bottom plate of the application;

[0041] Figure 10 is a schematic diagram of the split structure of the connector of the application;

[0042] Figure 11 is a schematic diagram of the structure of the adapter assembly and the connector in the state of docking of the application;

[0043] Figure 12 is a schematic diagram of the first perspective structure of the adapter assembly of the application;

[0044] Figure 13 Figure 2 is a structural schematic diagram of the second perspective view of the docking assembly of the present application.

[0045] In the figure: 1, base plate; 2, frame body; 301, first lifting cylinder; 302, first piston plate; 303, second lifting cylinder; 304, guide hole; 305, second piston plate; 306, top rod; 307, through pipe; 308, lifting frame; 309, pressing plate; 310, input pipe; 311, air release pipe; 401, second screw rod; 402, pressing member; 501, fixing member; 502, unwinding roller; 503, winding spring; 601, gantry frame; 602, third screw rod; 603, lifting plate; 604, turning roller; 605, guide rod; 701, docking plate; 702, docking head; 703, rotary joint; 704, Z-shaped pipe; 705, suction head; 706, suction hole; 707, sealing gasket; 708, motor; 709, driving gear; 710, driven gear; 711, insertion hole; 712, electromagnetic bolt; 713, bearing block; 714, first screw rod; 715, sliding block; 716, chuck; 717, socket; 801, through hole; 802, locking cap; 81, connecting head; 811, docking portion; 812, locking portion; 901, cylindrical groove; 902, square rod; 903, columnar block; 904, swing rod; 905, synchronous wheel; 906, clamping groove; 907, spring bolt structure; 908, strip-shaped groove; 909, fourth screw rod; 910, adjusting block; 10, three-way pipe joint; 11, pressure gauge; 12, air blowing nozzle; 13, cleaning roller; 14, cleaning cloth; 15, horizontal frame. DETAILED DESCRIPTION

[0046] The present application will be further described in detail below with reference to examples.

[0047] Example 1

[0048] As Figures 1-13As shown, the present application provides a commercial refrigerator airtightness detection equipment, comprising a frame body 2; further comprising: a bottom plate 1; a unwinding assembly installed at the top of the frame body 2 for releasing and winding the sealing film, comprising a unwinding roller 502 and a fixing piece 501, the central shaft of the unwinding roller 502 is rotatably connected with the fixing piece 501, and the main shaft is fixedly connected with the inner end of the coil spring 503, and the outer end of the coil spring 503 is fixedly connected with the fixing piece 501; a traction assembly comprising a lifting mechanism installed at the top of the frame body 2 and a lifting frame 308 installed at the movable end of the lifting mechanism, one side of the lifting frame 308 is fixedly connected with a positioning mechanism, and the positioning mechanism is used for fixing the head of the sealing film; one side of the lifting frame 308 is fixedly connected with a pressing plate 309, and the pressing plate 309 is detachably connected with a connector 81; a steering assembly comprising a roller frame and a steering roller 604 rotatably connected to the inner side of the roller frame, the side of the steering roller 604 away from the unwinding assembly is flush with one side of the positioning mechanism; a vacuum pump for pumping the connector 81; an adapter assembly detachably connected to the pressing plate 309 and connected with the connector 81, forming a closed space with the surface of the commercial refrigerator to detect the airtightness of the surface of the commercial refrigerator; an installation assembly, the frame body 2 is connected to the top of the bottom plate 1 through the installation assembly, and the installation assembly is used for controlling the movement of the frame body 2 and fixing the frame body 2 with the commercial refrigerator.

[0049] The present application can accurately focus on the core influencing part of the airtightness of the commercial refrigerator, that is, the door and the sealing strip around the door, and can indirectly reflect the overall airtightness of the refrigerator by forming a closed space with the door through the sealing film and pumping to detect, without blocking the complex channel inside the refrigerator, greatly simplifying the operation process; at the same time, in the unwinding process of the sealing film, the coil spring 503 of the unwinding assembly can be relied on to straighten it, and after the detection is completed, it can also be used for winding and resetting, the unwinding amount of the sealing film is controlled to adapt to different sizes of refrigerators, without customizing detection tools for a single refrigerator, and supporting detection under the working state of the refrigerator, without stopping or disassembling parts, without affecting the normal refrigeration and product storage of the refrigerator, meeting the needs of non-stop maintenance of commercial refrigerators; during detection, whether the airtightness is qualified can be quickly judged through the change of negative pressure, the leakage point can be accurately positioned by combining soap water or colored smoke, and the surface smoothness of the bonding part of the door and the sealing strip can also be detected through the adapter assembly, which is flexible and comprehensive in function, and can effectively guarantee the reliability and practicality of the detection result.

[0050] Since one of the main influencing factors of the airtightness of the refrigerator is the door of the refrigerator, and the airtightness is mainly reflected on the sealing strip around the door, the airtightness of the door can indirectly reflect the airtightness of the refrigerator by detecting the airtightness of the door;

[0051] In operation, the door of the commercial refrigerator is opened, the frame 2 is preliminarily closed to the door, and the frame 2 is moved to a position opposite to the door, but is not fixed by the installation assembly temporarily; the unwinding roller 502 is rotationally connected to the fixing member 501 through a center shaft, and the main shaft of the unwinding roller 502 is fixed to the inner end of the coil spring 503, and the outer end of the coil spring 503 is connected to the fixing member 501; when the traction assembly pulls the blocking film, the unwinding roller 502 rotates to release the blocking film against the elastic force of the coil spring 503, and the blocking film changes direction through the deflection roller 604 rotationally connected to the inner side of the roller frame (because the side of the deflection roller 604 away from the unwinding assembly is flush with the positioning mechanism, the blocking film between the deflection roller 604 and the positioning mechanism remains in a vertical state), wherein the coil spring 503 can straighten the blocking film, thereby avoiding leakage; after the lifting mechanism of the traction assembly drives the lifting frame 308 to a height suitable for the door of the commercial refrigerator, the preparation work before detection is completed. The specific detection process is as follows:

[0052] Detection of one side of the door: by attaching the blocking film to the door (using the installation assembly to move the frame 2), the sealing strips around the door are in close contact with the blocking film, forming a sealed space between the door and the blocking film, then the frame 2 is fixed to the door using the installation assembly, and then the space between the door and the blocking film is evacuated, thereby firmly adsorbing the blocking film on the door on the one hand, and entering the detection state on the other hand, and stopping the evacuation when the pressure in the space reaches a certain value. Under this condition, if the negative pressure in the space continues to decrease after a period of time, it indicates that the door has a problem with air tightness; if the negative pressure in the space remains constant, it indicates that the door has good air tightness. In addition, when there is a problem with air tightness, further operation is performed to detect the specific leakage position. In the case of ensuring the size of the negative pressure in the space, the detection method can be to apply a layer of soapy water to the door gap position, or to move a colored smoke source around the door. When the colored smoke is in the "sucked away" state at a certain position, it indicates that there is a leak at that position.

[0053] Although the main influencing factor of air tightness is the door of the refrigerator (the sealing strip part), the smoothness of the part attached to the sealing strip on the refrigerator is also one of the main factors affecting the sealing performance, and directly affects the sealing effect of the sealing strip, so it is necessary to detect the smoothness of the side of the door of the refrigerator.

[0054] The detection method is as follows: the adapter assembly is installed on the pressing plate 309 and is connected to the end of the connecting head 81 away from the vacuumizing device, at this time the adapter assembly can be used to detect the air tightness of the side of the door of the refrigerator space. Specifically, the connecting head 81 itself has a semi-closed structure composed of multiple sealing pads 707 (only one side is connected to the outside), and forms a closed space with the surface of the commercial refrigerator. At this time, by external vacuumizing, the adsorption condition can reflect the smoothness of the surface (reflecting the air tightness when cooperating with the sealing strip).

[0055] The vacuumizing device can be an electrically controlled vacuum pump or a manually operated vacuum pump, and the specific type can be determined according to the actual use (the former is more efficient, and the latter is more portable).

[0056] Four universal wheels are mounted at the bottom of the base plate 1 to facilitate the movement of the device as a whole, including the transfer in the non-working state and the position adjustment in the working state.

[0057] Example 2

[0058] As shown in Figure 11 , Figure 12 and Figure 13 , based on example 1, the application provides a technical solution: preferably, the adapter assembly includes a docking plate 701, one side of the docking plate 701 is fixedly connected with a docking head 702, the side away from the docking head 702 is fixedly connected with a rotary joint 703, the rotary joint 703 and the docking head 702 are communicated through a pipeline, one end of the rotary joint 703 away from the docking plate 701 is fixedly connected with a Z-shaped pipe 704, one end of the Z-shaped pipe 704 away from the rotary joint 703 is fixedly connected with a suction head 705, one side of the suction head 705 away from the Z-shaped pipe 704 is fixedly connected with a rectangular closed loop sealing gasket 707, and a plurality of suction holes 706 communicating with the inside of the suction head 705 are formed on the side, the Z-shaped pipe 704 and the suction head 705 are communicated; a motor 708 is fixedly installed at the bottom of the docking plate 701, the output end of the motor 708 is fixedly connected with a driving gear 709, a driven gear 710 is fixedly connected on the outer wall of one end of the rotary joint 703 close to the Z-shaped pipe 704, the driving gear 709 and the driven gear 710 are meshed and connected, and a sealing ring is fixedly connected on the side of the docking head 702 away from the docking plate 701; the docking plate 701 is detachably connected with the pressing plate 309 through the clamping mechanism, and the sealing gasket 707 and the universal sealing strip are made of the same material.

[0059] In this embodiment, by setting the adapter assembly, the smoothness of the refrigerator itself can be detected, through which the cooperation degree of the refrigerator itself and the sealing strip can be reflected, reducing the problem of affecting the judgment result of the sealing strip caused by the surface defects of the refrigerator; the rectangular closed loop sealing gasket 707 of the suction head 705 cooperates with the suction hole 706 to accurately form a local closed space, and the smoothness of the refrigerator surface can be judged by observing the adsorption state through vacuumizing, and then the air tightness of the cooperation with the sealing strip is reflected, the detection precision is high, and the overall structure can adapt to the detection needs of different models of refrigerators without additional adjustment to cover the key areas such as the corners and edges of the door.

[0060] The scheme can carry out detection in the scene that the refrigerator is normally working and the goods are stored inside. The suction head 705 is small in size and can be adjusted in angle through the gear transmission driven by the motor 708. The goods inside the refrigerator need not be moved or taken out during detection, so that the transfer loss and deterioration of the goods are avoided, and the actual demand of full load operation of the commercial refrigerator is met.

[0061] The clamping mechanism includes a bearing block 713 fixedly connected with the butt joint plate 701. A strip-shaped groove 908 is formed in the bearing block 713. A first screw rod 714 is rotatably connected inside the strip-shaped groove 908. A sliding block 715 is threadedly connected outside the first screw rod 714. The sliding block 715 is slidably connected with the inner wall of the strip-shaped groove 908. A chuck 716 is fixedly connected to one side of the sliding block 715. A socket 717 is fixedly connected to one side of the pressing plate 309 close to the lifting frame 308. A slot is formed in one side of the socket 717 away from the pressing plate 309. The slot is matched in shape with the chuck 716.

[0062] When it is needed to detect the smoothness of one side surface of the refrigerator door according to the above scheme, the adapter assembly is first fixed with the pressing plate 309 through the clamping mechanism. Specifically, the butt joint 702 is butted with the connecting head 81. The first screw rod 714 in the strip-shaped groove 908 of the bearing block 713 is rotated to drive the sliding block 715 threadedly connected outside to slide along the strip-shaped groove 908, so that the chuck 716 on one side of the sliding block 715 is inserted into the slot of the socket 717 on the pressing plate 309 (the chuck 716 is matched in shape with the slot), until the sealing ring between the butt joint 702 and the connecting head 81 is compressed tightly, and the detachable fixing of the butt joint plate 701 and the pressing plate 309 is completed. The side of the connecting head 81 away from the butt joint 702 is butted with the vacuumizing device, and the detection can be started.

[0063] During detection, the sealing gasket 707 on the suction head 705 is attached to one side surface of the commercial refrigerator with the door, so that the sealing gasket 707 and the commercial refrigerator form a sealed space. Then the external vacuumizing device is used to vacuumize, so that negative pressure is generated in the above space. The suction state of the suction head 705 (such as whether it is stably attached or the pressure is constant) is observed, so that the smoothness of the surface of the refrigerator (insufficient smoothness will lead to sealing failure and pressure drop) can be reflected. If there is a problem with the sealing performance of this part, the above negative pressure will be automatically released after a period of time, which indicates that there is a problem with the attachment degree of the surface of the refrigerator to the sealing gasket 707, and there is a problem with the air tightness. After the detection is completed, the position of the suction head 705 is changed until the detection of all positions of the refrigerator door contacting the door sealing strip is completed.

[0064] When the suction head 705 changes position, the motor 708 at the bottom of the docking plate 701 is started, the output end of the motor 708 drives the driving gear 709 to rotate, the driving gear 709 is engaged with the driven gear 710 on the outer wall of the rotary joint 703, the rotary joint 703 is driven to rotate, and then the Z-shaped pipe 704 fixed at one end of the rotary joint 703 and the suction head 705 are synchronously adjusted in angle, so that the suction head 705 is away from the rectangular closed loop sealing gasket 707 on the side of the Z-shaped pipe 704 and is attached to the surface of the refrigerator door.

[0065] Embodiment 3

[0066] As shown in Figure 1 、 Figure 2 and Figure 11 on the basis of embodiment 2, the application provides a technical solution: preferably, the positioning mechanism comprises a second screw rod 401 symmetrically and rotationally connected to the side wall of the pressing plate 309, and the second screw rod 401 is externally threadedly connected with a pressing part 402, the pressing part 402 is L-shaped, and a rubber pad is attached to the head portion; as shown in Figure 4 、 Figure 10 and Figure 11 , the connecting head 81 comprises a docking portion 811 and a locking portion 812, a through hole 801 is formed in the pressing plate 309, the locking portion 812 passes through the through hole 801 and is threadedly connected with a locking cap 802, the side of the locking cap 802 close to the pressing plate 309 is fixedly connected with a sealing ring, and the side of the above-mentioned docking portion 811 close to the pressing plate 309 is also provided with a sealing ring; the top of the pressing plate 309 is provided with a circular arc edge, the blocking film can pass the circular arc edge smoothly, and the position of the blocking film opposite to the through hole 801 is provided with an opening; one end of the locking portion 812 is detachably connected with a tee joint 10, one end of the tee joint 10 is connected with a pressure gauge 11, and the other end is in communication with the vacuumizing device through a pipeline.

[0067] When the blocking film is worn due to long-term use and affects the detection accuracy;

[0068] In the embodiment, by setting the positioning mechanism and using the design that the second screw rod 401 drives the pressing part 402, the blocking film can be stably fixed by the rubber pad, and the blocking film can be quickly unlocked and replaced, which is convenient to operate, avoids detection errors caused by wear of the blocking film, and ensures the accuracy of long-term detection; the locking cap 802 of the connecting head 81 cooperates with the sealing ring to ensure that the vacuumizing channel is reliably sealed, the tee joint 10 integrates the pressure gauge 11 and the vacuumizing interface, simplifies the equipment connection process, and does not need additional external instruments; the blocking film replacement mode is flexible, the worn section can be cut as needed or the whole roll can be replaced, the cost of consumables is reduced, and the blocking film can be adapted to different thicknesses of soft PVC film.

[0069] In operation, first rotate the second screw rod 401 on the side wall of the pressing plate 309 in the positioning mechanism to drive the externally threaded L-shaped pressing member 402 away from the blocking film to release the fixation of the head of the blocking film; if the wear section is short, the worn part of the head can be directly cut off, then pull the blocking film, the winding roller 502 overcomes the elastic force of the winding spring 503 to rotate to release the new blocking film section, after being guided by the turning roller 604, rotate the second screw rod 401 again to make the rubber pad at the head of the pressing member 402 adhere to the head of the blocking film to re-fix; if the whole blocking film is seriously worn, the fixing member 501 of the winding assembly can be disassembled, and after replacing the new blocking film roll, the fixing member 501 is reset; when installing the connecting head 81, pass the locking part 812 through the through hole 801 of the pressing plate 309, rotate the locking cap 802 to extrude the sealing ring to realize sealing and fixation, and the pre-set opening of the blocking film is aligned with the connecting head 81; then connect the pressure gauge 11 and the vacuumizing device through the tee joint 10, and the detection can be restored; during the detection process, the pressure gauge 11 monitors the negative pressure value of the sealed space in real time to ensure the detection accuracy.

[0070] The installation process of the blocking film needs to groove on the blocking film, the shape of the groove is not required, but it is required to ensure that the groove is smooth (similar to a circular or elliptical design), to avoid the blocking film being easily torn, but the size is limited, that is, less than the diameter of the sealing ring at this position, and greater than the diameter of the locking part 812.

[0071] Embodiment 4

[0072] As shown in Figure 6 and Figure 7 on the basis of embodiment 3, the application provides a technical solution: preferably, the lifting mechanism comprises first lifting cylinders 301 fixedly connected to the top of the frame body 2, first piston plates 302 slidably connected between the inner walls of the first lifting cylinders 301, second lifting cylinders 303 fixedly connected to the top of the first piston plates 302, second piston plates 305 slidably connected between the inner walls of the second lifting cylinders 303, top rods 306 fixedly connected to the top of the second piston plates 305, the top rods 306 being fixedly connected to the lifting frame 308, guide holes 304 being formed in the middle of the first piston plates 302, two first lifting cylinders 301 being communicated through a through pipe 307, the through pipe 307 being communicated with an external air source through an input pipe 310, a one-way valve being arranged in the input pipe 310, limit rings being fixedly connected to the top of the first lifting cylinders 301 and the second lifting cylinders 303, two air release pipes 311 being symmetrically arranged at the bottom of the through pipe 307, electromagnetic valves being arranged in the middle of the air release pipes 311, and one-way valves being arranged in the air release pipes 311.

[0073] In the embodiment, the lifting structure of multiple pistons can realize large lifting stroke, adapt to the detection needs of refrigerators of different heights, shrink in volume during transfer, facilitate equipment transportation and storage, save transportation and storage space, and is especially suitable for on-site detection or multi-site circulation use. The first lifting cylinders 301 are symmetrically distributed to ensure that the lifting frame 308 is uniformly stressed and avoids inclination to cause misalignment of the sealing film. The limiting ring prevents the piston plate from coming out, the one-way valve ensures that the lifting frame 308 is stable when the gas source is interrupted, and the safety of the equipment is improved.

[0074] The above-mentioned gas-driven lifting mode can fine-tune the height by controlling the gas source pressure, accurately align the refrigerator detection area, cooperate with the sealing film and the positioning mechanism, quickly complete the height adaptation under the working state of the refrigerator, and does not affect the detection efficiency.

[0075] When the equipment is in use, the external gas source supplies gas to the conducting pipe 307 through the input pipe 310 with a one-way valve, the gas is distributed to the two first lifting cylinders 301, the first piston plate 302 is pushed upward, at the same time, the gas enters the second lifting cylinder 303 through the guide hole 304 of the first piston plate 302, the second piston plate 305 and the top rod 306 are pushed upward, and the lifting frame 308 is adjusted to the height of the refrigerator door. When the equipment needs to be transferred or stored, the electromagnetic valve is opened to release the gas in the first lifting cylinder 301, the first piston plate 302 slides downward along the cylinder wall under the action of gravity, the second piston plate 305 synchronously descends, the top rod 306 drives the lifting frame 308 to shrink, and the first and second piston plates 305 abut against the limiting ring. At this time, the overall height of the lifting mechanism is greatly reduced, and the occupied volume of the equipment is reduced.

[0076] As shown in Figure 2 , Figure 4 and Figure 5 , preferably, the steering assembly further comprises a portal frame 601 fixedly connected to the top of the frame body 2, a third screw rod 602 is threadedly connected to the top of the portal frame 601, the bottom of the third screw rod 602 extends below the portal frame 601 and is rotatably connected with a lifting plate 603, two guide rods 605 are symmetrically and slidably connected to the top of the portal frame 601, the bottoms of the two guide rods 605 extend below the portal frame 601 and are fixedly connected with the lifting plate 603, and the roller frame is fixedly connected to one side of the lifting plate 603.

[0077] In the embodiment, the turning assembly is arranged as a height-adjustable structure, and the position of the turning roller 604 can be accurately adjusted through cooperation of the screw rod and the guide rod 605, so as to adapt to the door height of the refrigerator of different sizes, avoid the difference in the size of the refrigerator, and the difference in the height of the lower part of the door panel, and ensure the flatness and sealing property of the film during detection. The third screw rod 602 is rotated to drive the lifting plate 603 connected to the bottom to slide along the guide rod 605, and the guide rod 605 prevents the lifting plate 603 from rotating and deviating. The roller frame fixed on one side of the lifting plate 603 is lifted synchronously with the lifting plate 603, so as to adjust the height of the turning roller 604 until the turning roller 604 corresponds to the position of the sealing strip below the door, so that the sealing film can be perfectly matched with the sealing strip of the door in the subsequent matching process.

[0078] Embodiment 5

[0079] As shown in Figure 1 , Figure 5 and Figure 7 , on the basis of embodiment 4, the application provides a technical solution: preferably, two air blowing nozzles 12 are symmetrically arranged on one side of the frame 2, and the air blowing nozzles 12 are communicated with the air release pipe 311; two cross frames 15 are symmetrically fixedly connected on one side of the gantry 601, and a cleaning roller 13 is rotationally connected between the sides of the two cross frames 15 close to each other, and a plurality of cleaning cloths 14 are radially and equidistantly arranged outside the cleaning roller 13, and the central shaft of the cleaning roller 13 is drivingly connected with the central shaft of the unwinding roller 502 through a belt and a belt pulley.

[0080] In the embodiment, the pre-cleaning of the air blowing nozzles 12 and the wiping cleaning of the cleaning roller 13 form double protection, and the impurities on the surface of the sealing film are completely removed, and the air blowing nozzles 12 are communicated with the air release pipe 311, so that when the electromagnetic valve is turned on (when the lifting mechanism is lowered), the air discharged from the air blowing nozzles 12 is blown out, so as to blow off the dust on the sealing film.

[0081] Further, the cleaning roller 13 is linked with the unwinding roller 502, and no additional driving device is needed, so that the unwinding is realized simultaneously with the cleaning, the detection time is not increased, and the detection efficiency is improved; the cleaning cloths 14 are radially distributed, the wiping area is uniform, the surface of the film is not damaged, the sealing film can be repeatedly used, the consumable cost is reduced, the outer part is composed of the radial cloth strips, the cleaning cloths 14 are flung outwards by rotating the cleaning roller 13 during cleaning, so as to realize the cleaning of the sealing film, and the cleaning cloths 14 can still clean the sealing film to different degrees even after the turning roller 604 is adjusted; the overall cleaning structure can adapt to the height requirement of different models of refrigerators, and no adjustment is needed due to the size of the refrigerator, and the universality is high.

[0082] As shown in Figure 5 , Figure 8 and Figure 9As shown, preferably, the docking plate 701 is fixedly installed with an electromagnetic latch 712 on the side close to the rotary joint 703, and four insertion holes 711 are equidistantly opened on the driven gear 710. The electromagnetic latch 712 is used in cooperation with the insertion holes 711.

[0083] In the embodiment, by setting the electromagnetic latch 712 and the insertion holes 711 of the driven gear 710, the precise positioning of the suction head 705 at the critical angle can be realized. When detecting, the locking state of the output shaft of the motor 708 can be released, so as to avoid damage caused by continuous load when the motor 708 stops; resist the vibration interference during the operation of the refrigerator, avoid the detection error caused by the angle deviation, and ensure the consistency of the detection position.

[0084] When detecting the smoothness of the surface of the refrigerator, if it is necessary to adjust the angle of the suction head 705 to adapt to different areas of the refrigerator door, first, control the electromagnetic latch 712 to be powered off, so as to retract it from the insertion holes 711 of the driven gear 710, and release the angle locking; start the motor 708 at the bottom of the docking plate 701, and drive the driving gear 709 at the output end of the motor 708 to rotate. The driving gear 709 is engaged with the driven gear 710 on the outer wall of the rotary joint 703, so as to drive the rotary joint 703 and the suction head 705 to rotate synchronously, until the target angle is adjusted; then the electromagnetic latch 712 is powered on and extended, inserted into the corresponding insertion hole 711 of the driven gear 710, and the angle is relocked to prevent the suction head 705 from deviating due to the vibration of the refrigerator during the detection process.

[0085] As shown in Figure 3 , Figure 5 and Figure 9 , preferably, the installation assembly comprises two cylindrical grooves 901 symmetrically opened on one side of the bottom plate 1, two communication grooves symmetrically opened on the other side of the bottom plate 1 and communicating with the cylindrical grooves 901, a columnar block 903 provided inside the cylindrical groove 901 and having the same shape as the end face of the cylindrical groove 901, the columnar block 903 being attached to the inner wall of the cylindrical groove 901, a square rod 902 fixedly connected to one side of the columnar block 903, the square rod 902 extending to the outside of the bottom plate 1 through the communication grooves and being fixedly connected with a swing rod 904, two synchronous wheels 905 rotatably connected to one side of the bottom plate 1, the two synchronous wheels 905 being drivingly connected through a synchronous belt, the central shafts of the two synchronous wheels 905 each having a square groove penetrating through both ends, and the square rod 902 being slidingly connected with the square grooves; a plurality of clamping grooves 906 are opened on the four side walls of the square rod 902, a spring latch structure 907 is provided on the bottom plate 1, and the spring latch structure 907 is used in cooperation with the clamping grooves 906; a strip-shaped groove 908 is opened on the top of the bottom plate 1, a fourth screw rod 909 is rotatably connected inside the strip-shaped groove 908, an adjusting block 910 is threadedly connected to the outside of the fourth screw rod 909, the adjusting block 910 is slidingly connected with the strip-shaped groove 908, the adjusting block 910 is fixedly connected to the frame body 2, and one end of the fourth screw rod 909 extends to the outside of the bottom plate 1 and is fixedly connected with a handle.

[0086] Before detection, first move the base plate 1 to the position opposite the cabinet door (the cabinet door is opened and in the same plane as the commercial refrigerator), initially both swing rods 904 are in a horizontal state and are wholly accommodated on the base plate 1, correspondingly, the spring latch structure 907 is clamped with the clamping groove 906 on the square rod 902; when fixed with the commercial refrigerator door, first pull out the swing rod 904, this process ensures that the swing rod 904 does not contact the commercial refrigerator, if there is contact, it is necessary to swing the swing rod 904 to the other side in the empty position in advance, and the operation mode is also to pull out the swing rod 904 and then rotate it to realize synchronous swinging; when the swing rod 904 is pulled out to the stroke limit of the square rod 902, the swing rod 904 is turned over until it is in a vertical state, the spring latch is released to reset, and the swing rod 904 is fine-tuned until the spring latch is opposite the nearest clamping groove 906, the fixing is completed, the position of the base plate 1 is fine-tuned so that the swing rod 904 contacts the cabinet door; then the unwinding operation of the sealing film is performed again until the traction assembly is flush with the sealing strip on the upper part of the commercial refrigerator door, then the adjusting block 910 is moved by rotating the fourth screw rod 909, and the frame body 2 is moved towards the side close to the cabinet door until the sealing film contacts the sealing strip, in this state, the two sides of the cabinet door respectively contact the swing rod 904 and the sealing film, forming a basic limit for the sealing film, avoiding the gap between the sealing film and the sealing strip during the detection process to form a closed space.

[0087] Preferably, the sealing film is a soft PVC film with a thickness of 3 mm.

[0088] In this embodiment, the scheme adopts the balance between flexibility and strength of a 3 mm soft PVC film, which can closely fit the shape of the cabinet door of different models of refrigerators and resist deformation under negative pressure during vacuum extraction, ensuring the sealing performance of the closed space and improving the detection accuracy (for large refrigerators, a thicker sealing film is needed due to the larger closed surface); the smooth surface of the material is easy to clean, and can be reused multiple times with the cleaning assembly, reducing the cost of consumables, and the low-temperature resistance is suitable for the low-temperature environment during the operation of the refrigerator, and will not be hard and brittle due to temperature changes; the soft PVC film has low cost and good processing performance, and can be pre-punched according to the size of the cabinet door of different models of refrigerators without additional customization, which meets the detection needs of the equipment for different refrigerators, and has no odor and good chemical stability, even if food items are stored in the refrigerator, it will not cause pollution, meeting the hygiene requirements of commercial refrigerators.

[0089] The above describes the present application in detail in general, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the present application are within the scope of protection of the present application.

Claims

1. A commercial refrigerator airtightness detection device comprising a frame body (2); characterized in that, Also include: The bottom plate (1); Unwinding assembly, installed on the top of the frame (2), for releasing and winding the sealing film, comprising an unwinding roller (502) and a fixed part (501), the central axis of the unwinding roller (502) is rotatably connected with the fixed part (501), and the main shaft is fixedly connected with the inner end of the coil spring (503), and the outer end of the coil spring (503) is fixedly connected with the fixed part (501); Traction assembly, comprising a lifting mechanism installed on the top of the frame (2) and a lifting frame (308) installed on the movable end of the lifting mechanism, one side of the lifting frame (308) is fixedly connected with a positioning mechanism, and the positioning mechanism is used for fixing the head of the sealing film; One side of the lifting frame (308) is fixedly connected with a pressing plate (309), and the pressing plate (309) is detachably connected with a connecting head (81); The steering assembly comprises a roller frame and a steering roller (604) rotatably connected to the inner side of the roller frame, and the side of the steering roller (604) away from the unwinding assembly is flush with the side of the positioning mechanism close to the pressing plate (309); Vacuumizing device for vacuumizing the connecting head (81); Adapter assembly, which is detachably connected to the pressing plate (309) and is in butt joint with the connecting head (81), forms a closed space with the surface of the commercial refrigerator to detect the air tightness of the surface; The mounting assembly is used for controlling the movement of the frame (2) and fixing the frame (2) to the commercial refrigerator. The adapter assembly comprises a butt joint plate (701), one side of the butt joint plate (701) is fixedly connected with a butt joint (702), the side away from the butt joint (702) is fixedly connected with a rotary joint (703), the rotary joint (703) and the butt joint (702) are communicated through a pipeline, one end of the rotary joint (703) away from the butt joint plate (701) is fixedly connected with a Z-shaped pipe (704), one end of the Z-shaped pipe (704) away from the rotary joint (703) is fixedly connected with a suction head (705), one side of the suction head (705) away from the Z-shaped pipe (704) is fixedly connected with a sealing gasket (707) forming a rectangular closed loop, and a plurality of suction holes (706) communicating with the inside of the suction head (705) are formed on the side, the Z-shaped pipe (704) and the suction head (705) are communicated; The bottom of the butt joint plate (701) is fixedly installed with a motor (708), the output end of the motor (708) is fixedly connected with a driving gear (709), the outer wall of one end of the rotary joint (703) close to the Z-shaped pipe (704) is fixedly connected with a driven gear (710), the driving gear (709) and the driven gear (710) are meshed and connected, and the side of the butt joint (702) away from the butt joint plate (701) is fixedly connected with a sealing ring; The butt joint plate (701) is detachably connected with the pressing plate (309) through the clamping mechanism; The positioning mechanism comprises a second screw rod (401) symmetrically and rotatably connected to the side wall of the pressing plate (309), an external thread of the second screw rod (401) is connected with a pressing part (402), the pressing part (402) is L-shaped, and a head part is pasted with a rubber pad; the connecting head (81) comprises a butt joint part (811) and a locking part (812), the pressing plate (309) is provided with a through hole (801), the locking part (812) passes through the through hole (801) and is connected with a locking cap (802) through a thread, one side of the locking cap (802) close to the pressing plate (309) is fixedly connected with a sealing ring, and one side of the butt joint part (811) close to the pressing plate (309) is also provided with a sealing ring; the top of the pressing plate (309) is provided as a circular arc, the position of the through hole (801) opposite to the blocking film is provided with an opening, and one end of the locking part (812) is detachably connected with a tee pipe joint (10), one end of the tee pipe joint (10) is connected with a pressure gauge (11), and the other end is communicated with the vacuumizing device through a pipeline.

2. The commercial refrigerator airtightness detecting apparatus according to claim 1, wherein The lifting mechanism comprises first lifting cylinders (301) fixedly connected to the top of the frame body (2), first piston plates (302) slidably connected between the inner walls of the first lifting cylinders (301), second lifting cylinders (303) fixedly connected to the top of the first piston plates (302), second piston plates (305) slidably connected between the inner walls of the second lifting cylinders (303), top rods (306) fixedly connected to the top of the second piston plates (305), lifting frames (308) fixedly connected to the top of the top rods (306), guide holes (304) formed in the middle of the first piston plates (302), two first lifting cylinders (301) communicated through a through pipe (307), the through pipe (307) communicated with an external air source through an input pipe (310), a one-way valve arranged in the input pipe (310), limit rings fixedly connected to the top of the first lifting cylinders (301) and the second lifting cylinders (303), two air release pipes (311) symmetrically arranged at the bottom of the through pipe (307), electromagnetic valves arranged in the middle of the air release pipes (311), and one-way valves arranged in the air release pipes (311).

3. The commercial refrigerator airtightness detecting apparatus according to claim 2, wherein The steering assembly further comprises a portal frame (601) fixedly connected to the top of the frame body (2), a third screw rod (602) threadedly connected to the top of the portal frame (601), the third screw rod (602) rotatably connected with a lifting plate (603) extending below the portal frame (601), two guide rods (605) symmetrically and slidably connected to the top of the portal frame (601), the bottom of the two guide rods (605) extending below the portal frame (601) and fixedly connected with the lifting plate (603), and the roller frame fixedly connected to one side of the lifting plate (603).

4. The commercial refrigerator airtightness detecting apparatus according to claim 3, wherein Two air blowing nozzles (12) are symmetrically arranged on one side of the frame body (2), and the air blowing nozzles (12) are communicated with the air releasing pipe (311); two cross frames (15) are symmetrically and fixedly connected on one side of the portal frame (601), and a cleaning roller (13) is rotatably connected between the sides of the two cross frames (15) which are close to each other, a plurality of cleaning cloths (14) are radially and equidistantly arranged on the outside of the cleaning roller (13), and the central shaft of the cleaning roller (13) is drivingly connected with the central shaft of the unwinding roller (502) through a belt and a belt pulley.

5. The commercial refrigerator airtightness detection device according to claim 4, characterized in that, The docking plate (701) is fixedly installed with an electromagnetic latch (712) on the side close to the rotary joint (703), four insertion holes (711) are equidistantly formed in the driven gear (710), and the electromagnetic latch (712) is used in cooperation with the insertion holes (711).

6. The commercial refrigerator airtightness detecting apparatus according to claim 5, wherein The mounting assembly comprises two cylindrical grooves (901) symmetrically formed on one side of a bottom plate (1), two communication grooves symmetrically formed on the other side of the bottom plate (1) and communicated with the cylindrical grooves (901), a columnar block (903) with the same shape as the end face of the cylindrical groove (901) arranged in the cylindrical groove (901), the columnar block (903) abutting against the inner wall of the cylindrical groove (901), a square rod (902) fixedly connected to one side of the columnar block (903), the square rod (902) extending to the outside of the bottom plate (1) through the communication groove and fixedly connected with a swing rod (904), two synchronous wheels (905) rotatably connected to one side of the bottom plate (1), the two synchronous wheels (905) drivingly connected through a synchronous belt, square grooves penetrating through both ends formed on the central shafts of the two synchronous wheels (905), and the square rod (902) slidingly connected with the square grooves; a plurality of clamping grooves (906) are formed in the four side walls of the square rod (902), a spring latch structure (907) is arranged on the bottom plate (1), and the spring latch structure (907) is used in cooperation with the clamping grooves (906); a strip-shaped groove (908) is formed in the top of the bottom plate (1), a fourth screw rod (909) is rotatably connected in the strip-shaped groove (908), an adjusting block (910) is threadedly connected to the outside of the fourth screw rod (909), the adjusting block (910) slidingly connected with the strip-shaped groove (908), the top of the adjusting block (910) fixedly connected with a frame body (2), and one end of the fourth screw rod (909) extending to the outside of the bottom plate (1) and fixedly connected with a rotating handle.

7. The commercial refrigerator airtightness detecting apparatus according to claim 6, wherein The blocking film wound on the outside of the unwinding assembly is a soft PVC film with a thickness of 2-5 mm.

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