A single-container pre-pack sterilization device

Abstract

A single container pre-packaging sterilization device, including sterilization frame and at least two sterilization mechanism arranged on the sterilization frame, the sterilization mechanism includes sterilization shell, the sterilization shell is installed in the sterilization frame, the rotary table is arranged in the sterilization shell, the rotary table positioning mechanism and sterilization medium introduction seat are arranged on the sterilization shell, and the bottom end of the sterilization shell is container outlet. Sterilization medium enters the sterilization shell through sterilization medium introduction seat, and the disposable container is fully sterilized in the slow descending process after entering the sterilization shell. The utility model is arranged in the input and packaging link of disposable container, sterilization is realized in the container packaging process, and through multi-station sterilization, the production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of container packaging technology, specifically relating to sterilization packaging equipment for disposable containers. Background Technology

[0002] The packaging process is a crucial step in the production of disposable paper cups, plastic cups, fast food containers, yogurt cups, ice cream cups, sauce cups, self-heating food containers, fresh food packaging boxes, takeaway soup / porridge buckets, baking / dessert containers, and other similar containers (collectively referred to as "disposable containers"). This process is completed by packaging equipment. Current packaging equipment generally lacks a sterilization step during packaging, which can easily lead to bacterial residues and a shortened shelf life. Since disposable containers come into direct contact with drinking water, beverages, and food, microbial contamination can directly endanger the health of users, posing a health hazard.

[0003] Oversights in multiple stages of the disposable container production environment can become entry points for microbial contamination. These can be broadly categorized into five main factors: air, equipment, personnel, raw materials, and cleaning and disinfection.

[0004] 1. Air environment factors Airborne microorganisms are the most easily overlooked source of pollution, and they can settle directly onto the surface of disposable containers.

[0005] Air cleanliness is not up to standard: The production workshop has not carried out air purification treatment, or the clean area level is not high enough (such as not reaching Class 10,000 or Class 100,000), and bacteria and mold spores in the air will spread with the airflow.

[0006] Ventilation system problems: If the vents are not equipped with filters, the filters are not replaced for a long time, or the airflow direction is unreasonable (such as flowing from the contaminated area to the clean area), microorganisms will be carried into the core production area.

[0007] Excessive dust in the workshop: Dust is a "carrier" for microorganisms. If paper dust generated during paper cutting and disposable container molding is not cleaned up in time, it will attach to microorganisms and settle on the products.

[0008] 2. Production equipment factors Equipment is a critical link that comes into direct contact with disposable containers, and inadequate surface cleaning can lead to continuous contamination.

[0009] Residual dirt on equipment surfaces: If paper fibers, oil stains, or debris from previous batches remain in the gaps of equipment such as conveyor belts, molds, and packaging machines, bacteria will grow and transfer to newly produced disposable containers.

[0010] Untimely equipment maintenance: After prolonged operation, the seals may age, parts may rust, or all contact points (such as corners and interfaces) may not be covered during cleaning and disinfection, creating breeding grounds for microorganisms.

[0011] Cooling water / lubricant contamination: Some equipment requires the use of cooling water or lubricants. If these media themselves have excessive microbial levels, or if a leak occurs and comes into contact with disposable containers, it will directly cause contamination.

[0012] 3. Operator factors People are dynamic sources of pollution in the production environment, and their hygiene habits directly affect product safety.

[0013] Inadequate hand cleaning: If operators do not wash and disinfect their hands as required, or if their gloves are damaged or not replaced in time, bacteria on their hands (such as Escherichia coli and Staphylococcus aureus) can be transferred to disposable containers through contact.

[0014] Inadequate personal protective equipment: Failure to wear clean work clothes, caps, and masks allows microorganisms from hair, dander, and clothing to detach and contaminate products; eating and smoking in the workshop can also introduce exogenous microorganisms.

[0015] Improper personnel movement control: Non-production personnel may enter the clean area at will, or production personnel may enter the clean area directly from contaminated areas (such as raw material warehouses or restrooms), which may bring external microorganisms into the core production process.

[0016] 4. Raw material and auxiliary material factors If the raw materials themselves carry bacteria, it is difficult to completely remove them during subsequent processing, which will become a source of pollution.

[0017] Excessive microorganisms in the base paper / PE film: If the base paper (such as food-grade white cardboard) or the PE film on the inner wall of disposable containers gets damp during production, storage, and transportation (such as excessive humidity in the warehouse), mold will grow; damaged packaging can also lead to microbial invasion.

[0018] Adhesive / Ink Contamination: Some disposable containers require adhesives for molding or ink for external printing. If these auxiliary materials themselves fail to meet microbial standards or are contaminated during use, it will indirectly affect the hygiene of disposable containers.

[0019] 5. Cleaning and disinfection factors Improper cleaning and disinfection procedures can lead to the continuous accumulation of microorganisms in the production environment.

[0020] Incomplete cleaning: If only the surface of the workshop floor, walls, countertops, and auxiliary tools such as turnover baskets and pallets are cleaned without thoroughly cleaning the gaps and corners, microorganisms will remain and gradually multiply.

[0021] Improper disinfection frequency / method: Disinfection intervals that are too long (such as disinfecting only once a day, which cannot control the rate of microbial reproduction), or the use of insufficient concentration or unsuitable type of disinfectant (such as being ineffective against mold) will result in poor disinfection effects.

[0022] Secondary contamination after disinfection: If disinfected equipment and tools are not dried in time, or if they come into contact with unsterilized cloths or containers, they will be contaminated again by microorganisms.

[0023] During the molding, stacking, and packaging processes, disposable containers easily come into contact with equipment surfaces, operators' hands, and the air, potentially harboring bacteria, mold, and other microorganisms. These microorganisms can multiply during storage, especially in humid environments where the risk of mold growth is extremely high. By omitting the sterilization process, bacteria persist throughout the entire process from production to storage, ultimately reaching the end user. The specific hazards can be summarized in three points: 1. Storage Stage: Accelerated Deterioration and Significantly Shortened Shelf Life. Bacteria carried by containers during packaging (such as E. coli and mold spores from the production environment) will multiply rapidly under suitable temperature and humidity conditions (such as a humid warehouse and a temperature above 25°C). For example, disposable containers may develop mold, plastic cups may develop odors, and the inner walls of fast food boxes may become sticky. The original shelf life of 6 months may be shortened to 2-3 months, directly causing inventory losses.

[0024] 2. Usage Stage: Directly Threatens User Health. These multiplied bacteria can enter the human body through beverages and food that come into contact with the container. If the bacterial count exceeds the standard (e.g., E. coli exceeds the national standard), it may cause gastrointestinal discomfort, such as diarrhea and abdominal pain; if mold grows, it may also produce mycotoxins that are harmful to the human body, which are difficult to completely remove even with heating.

[0025] 3. Brand and compliance risks: Enterprises face double losses. Products without sterilization processes are considered substandard. If discovered by market regulators during random inspections, enterprises will face fines and production suspension for rectification. At the same time, if consumers experience health problems due to product use, it will lead to complaints and negative reviews, seriously damaging brand reputation and even causing market loss.

[0026] There is an urgent need in the market for a device that can sterilize products before packaging. Summary of the Invention

[0027] In view of the shortcomings of existing single-use container packaging technology, this utility model provides a sterilization device for single-container packaging that can sterilize before packaging and is highly efficient.

[0028] The sterilization device for single-container packaging of this utility model adopts the following technical solution.

[0029] The device includes a sterilization rack and at least two sterilization mechanisms mounted on the sterilization rack. Each sterilization mechanism includes a sterilization shell, which is installed in the sterilization rack. A turntable is installed inside the sterilization shell. A turntable positioning mechanism, a sterilization medium inlet seat, and a servo motor are mounted on the sterilization shell. The bottom end of the sterilization shell is an outlet. The turntables are distributed from top to bottom inside the sterilization shell, and the turntables are equipped with claws. The turntables are installed in the sterilization shell via a rotating shaft. The end face of the turntable is provided with a positioning hole that cooperates with the positioning pin in the turntable positioning mechanism (the turntable is positioned by inserting the positioning pin in the turntable positioning mechanism into the positioning hole).

[0030] The turntable has at least three evenly distributed claws. When the number of claws is even, the length of one claw in two opposing claws is greater than the length of the other claw (corresponding to the cross-section of the center hole), and the vertical center line of the rotating shaft is staggered (does not coincide) with the line connecting the center of the rotating shaft and the center of the positioning pin, forming a certain angle. This angle cannot be an integer multiple of 360 degrees divided by twice the number of claws (360 / 2 * number of claws). Each turntable can hold multiple disposable containers, which are stacked together as a packaging unit. The number of disposable containers in each packaging unit is set according to the packaging requirements, and the axial dimension of the turntable is also set according to the number of disposable containers that each packaging unit needs to hold.

[0031] Adjacent turntables are installed overlapping each other, meaning the center distance between adjacent turntables is less than the sum of the lengths of their two short claws. This creates an active and passive relationship between the turntables; one turntable is active relative to the other, and its rotation drives the other. Disposable containers can rotate and fall alternately on different turntables. Multiple turntables can extend the residence time of disposable containers within the sterilization shell, achieving thorough sterilization. The number of turntables should be determined based on the sterilization time of the disposable containers. A servo motor can be connected to any of the rotating shafts and is mounted on the sterilization shell.

[0032] The inner wall of the sterilization shell is equipped with an elastic damping plate, the end of which is arc-shaped. The arc shape allows the disposable container to be thrown along the tangent of the arc. The container is first lifted and rotated before falling freely, slowing its descent, ensuring thorough sterilization, increasing sterilization time, and limiting its trajectory. If the lower end is a turntable, the disposable container will fall onto the next turntable. If it is an elastic damping plate, the falling container will fall onto the next elastic damping plate until it reaches the bottom. The material selection, end arc angle (shape), and number of elastic damping plates are determined based on the sterilization time requirements and the properties of the disposable container (if the disposable container has low plasticity, it is easily damaged if the descent speed is fast or a collision occurs, requiring a smaller end arc angle, a material elasticity that matches this, and a higher arrangement density for the elastic damping plates).

[0033] The turntable positioning mechanism includes a positioning cylinder and a positioning pin. The positioning mechanism is installed on the sterilization shell (generally at the corresponding position of the first turntable). The positioning pin is connected to the piston rod of the positioning cylinder. The piston rod of the positioning cylinder drives the positioning pin to extend and retract, thereby locking or unlocking the turntable in the sterilization mechanism. When locked, the turntable cannot rotate.

[0034] The sterilization medium inlet seat has a sterilization medium inlet and a sterilization medium outlet on the inlet substrate. The sterilization medium inlet is connected to an external sterilization medium delivery pipe, and the sterilization medium outlet is connected to the inside of the sterilization shell.

[0035] After the disposable container enters the sterilization shell, the sterilization medium enters the sterilization shell through the sterilization medium inlet seat, and the disposable container is fully sterilized during the slow descent.

[0036] This invention achieves sterilization during the input and stacking process of disposable containers. Through the combined action of multiple turntables and elastic damping plates, disposable containers can be thoroughly sterilized. It is suitable for sterilizing disposable containers with low plasticity. At the same time, by optimizing the arrangement of the multi-station sterilization device, production efficiency is greatly improved. Attached Figure Description

[0037] Figure 1 This is a schematic diagram illustrating the application of the sterilization device before single-container packaging according to this utility model.

[0038] Figure 2 This is a schematic diagram of the sterilization device before single-container packaging according to this utility model.

[0039] Figure 3 This is a schematic diagram of the sterilization mechanism in a sterilization device.

[0040] Figure 4 This is a schematic diagram of the rotating positioning mechanism in the sterilization device.

[0041] Figure 5 This is a schematic diagram of the sterilization shell in the sterilization mechanism.

[0042] Figure 6 This is a schematic diagram of the rotating disc in the sterilization mechanism.

[0043] Figure 7 This is a schematic diagram of the sterilization process of the sterilization unit.

[0044] Figure 8 This is a schematic diagram of the sterilization medium inlet seat in the sterilization device.

[0045] In the diagram: 1. Sterilization device, 2. Input device, 3. Packaging device, 4. Frame, 5. Transmission device; 11. Rear mounting plate; 12. Side mounting bracket; 13. Turntable positioning mechanism; 14. Sterilization mechanism; 15. Sterilization medium inlet seat; 16. Front mounting plate; 17. Servo motor. 141. Sterilization shell; 142. Turntable; 143. Rotating shaft; 144. Elastic damping plate; 1411. Disposable container outlet; 131. Positioning cylinder; 132. Positioning pin; 141. Sterilization shell; 1411. Shaft hole; 1412. Locating pin hole; 1413. Rotary positioning mechanism mounting hole; 1414. Vertical center line of shaft hole; 1415. Line connecting the center of shaft hole and locating pin hole. 1421. Long claw, 1422. Long claw, 1423. Positioning hole, 1424. Short claw, 1425. Center hole, 1426. Short claw; 146. Disposable containers. Detailed Implementation

[0046] The sterilization device for single-container packaging of this utility model is specifically applied to, for example... Figure 1 The packaging equipment shown includes a frame 4, an input device 2, a sterilization device 1, and a sealing device 3. In this invention, the sterilization device 1 is positioned between the input device 2 and the sealing device 3, both mounted on the frame 4. Disposable containers enter the sterilization device 1 through the input device 2 for sterilization, and are then sealed by the sealing device 3. The sealed disposable containers are then transported out on the conveyor device 5.

[0047] Figure 2 This invention provides a sterilization device for single-container packaging. Figure 1 The sterilization device 1) in the middle has a structure including a sterilization rack, a sterilization mechanism 14, a turntable positioning mechanism 13, a sterilization medium inlet seat 15, a front mounting plate 16, a servo motor 17, and a rear mounting plate 11. Multiple sterilization mechanisms 14 ( Figure 2 Five sets of components are installed in the sterilization rack 12. The sterilization rack is a frame formed by connecting the left and right side mounting racks 12, the front mounting plate 16, and the rear mounting plate 11. The front mounting plate 16 has two parts, upper and lower, and is connected to the side mounting racks 12 along with the rear mounting plate 11. A servo motor 17 is installed on the rear mounting plate 11. The servo motor 17 is connected to one end of the rotating shaft 143 via a coupling for active compensation and precise locking. The sterilization mechanism 14 is equipped with a turntable positioning mechanism 13 and a sterilization medium inlet seat 15.

[0048] Figure 3 The structure of the sterilization mechanism 14 is shown, including a sterilization shell 141, and rotating disks 142 distributed from top to bottom inside the sterilization shell 141 (see...). Figure 7The turntable 142 is installed in the sterilization shell 141 via the rotating shaft 143. The bottom end of the sterilization shell 141 is the disposable container outlet 1411. Figure 4 The structure of the turntable positioning mechanism 13 is shown, including a positioning cylinder 131 and a positioning pin 132. The positioning cylinder 131 is mounted on the sterilization housing 141, and the positioning pin 132 is connected to the piston rod of the positioning cylinder 131. The piston rod of the positioning cylinder drives the positioning pin 132 to extend or retract, thereby locking or unlocking the sterilization mechanism.

[0049] The structure of the sterilization shell 141 is as follows Figure 5 As shown, the side of the sterilization housing 141 is provided with a shaft hole 1411, a turntable positioning mechanism mounting hole 1413, and a positioning pin hole 1412. The shaft hole 1411 is used to install the rotating shaft 143, the turntable positioning mechanism mounting hole 1413 is used to install the positioning cylinder 131 in the turntable positioning mechanism, and the positioning pin hole 1412 is used for the positioning pin 132 to extend into the sterilization housing 141 so as to be inserted into the positioning hole 1423 on the end face of the turntable 142. The angle between the vertical center line 1414 of the shaft hole and the line 1415 connecting the center of the shaft hole and the positioning pin hole is 40 degrees (the angle cannot be an integer multiple of 360 degrees divided by 2 times the number of claws (360 / 2 * number of claws). If the angle is 45 degrees or an integer multiple of 45 degrees, an equilibrium point may occur, and the turntable 142 may stop at this angle and cannot rotate automatically. The angle can only be any other angle). The structure of the turntable 142 is as follows. Figure 6 As shown, a central hole 1425 is provided at the center of the turntable 142, and adjacent long claws 1421, 1422, 1424, and 1426 are evenly distributed around its circumference. Long claws 1421 and 1424 are opposite each other (with an angle of 180 degrees), and long claws 1422 and 1426 are opposite each other (with an angle of 180 degrees). A positioning hole 1423 is provided on the end face of the turntable 142, and the turntable 142 is positioned by inserting a positioning pin 132 into the positioning hole 1423. An elastic damping plate 144 is provided on the inner wall of the sterilization shell 141. The end of the elastic damping plate 144 is arc-shaped. The arc shape allows the disposable container 146 to be thrown out along the arc tangent. The disposable container 146 is first lifted and rotated, and then falls freely, which slows down the falling speed of the disposable container 146, increases the sterilization time, limits its falling trajectory, and sterilizes without dead angles. If there are multiple elastic damping plates 144, the falling disposable container 146 will land on the next elastic damping plate 144 until it reaches the bottom. The material selection, end arc angle (shape), and number of elastic damping plates 144 are determined based on the sterilization time requirements and the properties of the disposable container 146 (if the disposable container 146 has low plasticity, it is easily damaged if the falling speed is fast or if it is hit by a collision, then the end arc angle of the elastic damping plate 144 should be small, the material elasticity should be matched, and the arrangement density should be high).

[0050] The elastic damping plate 144 serves two purposes: firstly, it absorbs the potential energy of the disposable container as it falls. Simultaneously, the absorbed potential energy is converted into elastic potential energy through its own elastic deformation, which in turn acts on the container, causing it to bounce back. Secondly, the design of the angle at the end of the elastic damping plate ensures the container is thrown tangentially. Based on the Bernoulli effect and the Magnus force principle, the container moves along an arc. Combined with its own gravity, it falls while rotating. The arc, speed, and trajectory of this rotation can be designed through the selection of the elastic damping plate material, the angle of elevation, and the arrangement of the plates. As the potential energy of the container is continuously absorbed by the elastic damping plate, it eventually falls when its potential energy approaches zero. During rotation, the container not only achieves thorough sterilization but also disturbs the sterilization medium, creating turbulence and maximizing its performance, thus improving its utilization efficiency.

[0051] See Figure 7 After the disposable container 146 enters the sterilization shell 141, it is installed at a 40-degree angle with the vertical center line 1414 of the shaft hole and the line 1415 connecting the center of the shaft hole and the center of the positioning pin hole (e.g. Figure 5 As shown), the center of gravity of turntable 142 will not coincide with the vertical center line 1414 of the shaft hole, thus naturally generating the incentive for clockwise rotation (the locating pin 13 is installed on the left side of the vertical center line 1411). Furthermore, due to the difference in length between the long claw 1421 and the short claw 1424, and between the long claw 1422 and the short claw 1426, a mass difference is generated, which, under the action of gravity, generates a self-driving force (such as...). Figure 7 (As shown). When the disposable container 146 enters the sterilization shell 141, its mass increases, correspondingly strengthening the rotational self-driving force. Whether the turntable 142 can rotate depends on whether the positioning pin 132 is in the positioning hole 1423 of the turntable 142. When the positioning pin 132 is in the positioning hole 1423 of the turntable 142, the turntable 142 is locked and cannot rotate. Conversely, it is not locked and can rotate freely.

[0052] When the input of disposable container 146 reaches the set value, the piston rod of positioning cylinder 131 retracts, causing positioning pin 132 to be pulled out of positioning hole 1423. Turntable 142 then rotates clockwise, and disposable container 146 detaches from turntable 142. After the disposable container 146 detaches from turntable 142, turntable 142 continues to rotate under inertial force. When positioning hole 1423 rotates to the position corresponding to positioning pin 132, the piston rod of positioning cylinder 131 extends, driving positioning pin 132 into positioning hole 1423, locking turntable 142 in place. If turntable 142 cannot rotate to the self-locking position under inertial force, active compensation is performed by servo motor 17 for precise locking. In this way, turntable 142 operates cyclically.

[0053] Adjacent turntables 142 are installed overlapping each other, meaning the center distance between adjacent turntables 142 is less than the sum of the lengths of short claws 1424 and 1426. This creates an active and passive relationship between adjacent turntables 142; one turntable 142 is active relative to the other. When one turntable 142 rotates, its claws drive the claws of the other turntable 142 to rotate, causing the disposable container 146 to rotate and fall on the turntables 142 in succession. The arrangement of multiple turntables can extend the residence time of the disposable container 146 within the sterilization shell 141, achieving thorough sterilization. The number of turntables 142 is determined based on the sterilization time of the disposable container 146.

[0054] The structure of the sterilization medium inlet seat 155 is as follows: Figure 8 As shown, the inlet substrate 1551 is provided with a sterilization medium inlet 1552, a sterilization medium outlet 1553, and a mounting hole 1554. The mounting hole 1554 is used to mount the inlet substrate 1551 onto the sterilization shell 141. The sterilization medium inlet 1552 is connected to an external sterilization medium delivery pipe, and the sterilization medium outlet 1553 communicates with the interior of the sterilization shell 141.

[0055] The operation process of the above-mentioned device is as follows.

[0056] Disposable containers 146 enter the corresponding turntable 142 in the sterilization shell 141, where they are stacked. Sterilization media (such as chlorine dioxide) enters the sterilization shell 141 through the sterilization media inlet 155 to sterilize the disposable containers 146. When the number of disposable containers 146 input onto the turntable 142 reaches a set quantity, no more disposable containers 146 can enter the corresponding turntable 142 in the sterilization shell 141. The positioning pin 132, responsible for locking the turntable 142, is pulled out of the positioning hole 1423 of the turntable 142 under the action of the positioning cylinder 131, and the turntable 142 automatically rotates (because the positioning mechanism 15 is installed on the left side of the vertical center line 14101 of the shaft hole, such as...). Figure 5As shown, turntable 142 rotates clockwise. Disposable container 146 detaches from the claws of turntable 142. Through the combined action of multiple turntables and elastic damping plates, the disposable container is thoroughly sterilized. Its trajectory is thrown along the end of elastic damping plate 144 (first lifted, then falling), continuously contacting subsequent turntables 142 and elastic damping plates 144 during the falling process. If the lower end is turntable 142, the disposable container 146 will fall onto the next turntable 142. If multiple elastic damping plates 144 exist, it will fall onto the elastic damping plates 144 again until the disposable container 146 leaves the sterilization mechanism 14 through the disposable container outlet 1411. After the disposable container 146 detaches from the claws of turntable 142, turntable 142 rotates to a predetermined position and is locked. Then the gate valve opens, and the disposable container 146 re-enters the corresponding turntable 142 in the sterilization shell 141, thus completing the cycle.

Claims

1. A sterilization device for single-container packaging, characterized in that, It includes a sterilization rack and at least two sterilization mechanisms mounted on the sterilization rack. Each sterilization mechanism includes a sterilization shell, which is installed in the sterilization rack. A turntable is installed inside the sterilization shell. A turntable positioning mechanism and a sterilization medium inlet seat are installed on the sterilization shell. The bottom end of the sterilization shell is a container outlet.

2. The sterilization device before single-container packaging according to claim 1, characterized in that, The turntables are distributed from top to bottom inside the sterilization shell, and the turntables are equipped with claws. The turntables are installed in the sterilization shell via a rotating shaft, and the end face of the turntables is provided with positioning holes that cooperate with the positioning pins in the turntable positioning mechanism.

3. The sterilization device before single-container packaging according to claim 2, characterized in that, The turntable has at least three claws, which are evenly distributed. When the number of claws is even, the length of one claw is greater than the length of the other claw in two opposite claws, and the vertical center line of the rotating shaft is staggered from the line connecting the center of the rotating shaft and the center of the positioning pin.

4. The sterilization device before single-container packaging according to claim 2, characterized in that, In the turntable, adjacent turntables are in a master-slave relationship, and one end of the shaft of one of the turntables is connected to a servo motor, which is mounted on the sterilization shell.

5. The sterilization device before single-container packaging according to claim 3, characterized in that, The angle between the vertical center line of the rotating shaft and the line connecting the center of the rotating shaft and the center of the locating pin cannot be an integer multiple of 360 degrees divided by twice the number of claws.

6. The sterilization device before single-container packaging according to claim 1, characterized in that, An elastic damping plate is provided on the inner wall of the sterilization shell, and the end of the elastic damping plate is arc-shaped.

7. The sterilization device before single-container packaging according to claim 1, characterized in that, The turntable positioning mechanism includes a positioning cylinder and a positioning pin. The positioning cylinder is mounted on the sterilization shell, and the positioning pin is connected to the piston rod of the positioning cylinder.

8. The sterilization device before single-container packaging according to claim 1, characterized in that, The sterilization medium inlet seat has a sterilization medium inlet and a sterilization medium outlet on the inlet substrate. The sterilization medium inlet is connected to an external sterilization medium delivery pipe, and the sterilization medium outlet is connected to the inside of the sterilization shell.

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