Mesh belt type pasteurization machine

Abstract

The utility model relates to the technical field of pasteurization machines, in particular to a mesh belt type pasteurization machine, which is characterized in that mesh belts are folded into multiple layers, so that the length of a sterilization tank is shortened, the occupied area of equipment is reduced, the arrangement of a small-sized production workshop is facilitated, and the practicability is good. Comprising a sterilization box and a heater, the device comprises a rack, a plurality of first chain wheels, a plurality of second chain wheels, a mesh belt, first chains, second chains and a plurality of material baskets, the first chain wheels and the second chain wheels are rotationally arranged on the rack, the material baskets are evenly arranged on the outer wall of the mesh belt, the first chains and the second chains are arranged on the two sides of the mesh belt, the first chain wheels are meshed with the two first chains, and the second chain wheels are meshed with the second chains. The plurality of chain wheels I and the plurality of chain wheels II are matched to enable the right part of the mesh belt to form a plurality of layers of horizontal conveying channels I which are arranged up and down in the cavity of the sterilization box, and meanwhile, the plurality of chain wheels I and the plurality of chain wheels II are matched to enable the left part of the mesh belt to form a vertically arranged conveying channel II in the cavity of the sterilization box.

Description

Technical Field

[0001] The utility model relates to the technical field of pasteurizers, in particular to a mesh-belt pasteurizer. Background Art

[0002] A mesh-belt pasteurizer uses a mesh belt to convey products, allowing them to enter high-temperature hot water for immersion and sterilization. Various mesh-belt pasteurizers have been proposed in the prior art, including a new pasteurizer disclosed in Chinese Utility Model Patent Publication No. CN216983467U. This pasteurizer replaces the upper anti-drifting net with an upper conveyor mesh belt equipped with conveying scrapers. Driven by an independent drive unit, this mesh belt performs both anti-drifting and conveying functions, and operates synchronously with the lower conveyor mesh belt in the same direction. This allows any product missed by the lower conveyor mesh belt to be transported by the upper conveyor mesh belt at the same time, eliminating the problem of product retention and product jamming due to insufficient clearance, thereby ensuring product quality.

[0003] However, the above-mentioned existing conveyor belt is set straight. Since pasteurization requires a sufficient amount of time and the conveyor belt does not stop, a very long sterilization water tank is required, resulting in a large area occupied by the equipment, which is not conducive to the layout of a small production workshop. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a mesh belt pasteurizer with good practicality, which shortens the length of the sterilization box slot and reduces the floor space of the equipment by folding the mesh belt in multiple layers, is conducive to the layout of small production workshops, and is convenient for use.

[0005] The utility model is a mesh-belt pasteurizer, comprising a sterilization box and a heater, wherein a chamber is arranged inside the sterilization box, and the heater is installed in the chamber; the utility model also comprises a frame, a plurality of sprockets 1, a plurality of sprockets 2, a mesh belt, a chain 1, a chain 2 and a plurality of material baskets, an inlet and an outlet are arranged on the upper part of the left end face of the sterilization box, the inlet and the outlet are communicated with the chamber, the frame is installed outside the sterilization box, a plurality of sprockets 1 and a plurality of sprockets 2 are rotatably arranged on the frame, a plurality of material baskets are evenly arranged on the outer wall of the mesh belt, and the left and right sides of the mesh belt are provided with a plurality of material baskets. Chain 1 and chain 2 are arranged on both sides, multiple sprockets 1 are engaged with the two chain 1s, multiple sprockets 1 support and guide the mesh belt from the inside and make one end of the mesh belt extend out of the left side of the sterilizer through the inlet and outlet, multiple sprockets 2 are engaged with the two chain 2s, multiple sprockets 2 support and guide the mesh belt from the outside, multiple sprockets 1 and multiple sprockets 2 cooperate to make the right part of the mesh belt form a multi-layer horizontal conveying channel 1 arranged up and down in the chamber of the sterilizer, and at the same time, multiple sprockets 1 and multiple sprockets 2 cooperate to make the left part of the mesh belt in the sterilizer The second vertical conveying channel is formed in the chamber; when working, sterilizing water is added to the chamber of the sterilization box, and the heater heats the sterilizing water to the temperature required for bus sterilization, and the products to be sterilized are placed from the left outside of the sterilization box into the material basket at the left end of the mesh belt. The multiple sprockets 1 and sprockets 2 drive the mesh belt to rotate clockwise, so that the mesh belt drives the multiple material baskets to enter the chamber through the inlet and outlet of the sterilization box, and move horizontally layer by layer along the conveying channel 1 under the drive of the right part of the mesh belt and move downward, so that the material basket gradually sinks into the sterilizing water and is soaked in the sterilizing water for a long enough time. The material basket reaches the left part of the mesh belt and rises through the vertical conveying channel 2 and outputs the left outside of the sterilization box through the inlet and outlet of the sterilization box. The material basket is opened to discharge the sterilized products and prepare for the next loading. Compared with the folded multi-layer setting of the right part of the mesh belt in the prior art, the length of the site occupied by the sterilization box is effectively shortened, thereby reducing the floor space of the equipment, which is conducive to the layout of a small production workshop and has good practicality.

[0006] Preferably, it also includes multiple partitions, which are horizontally installed in the chamber of the sterilization box. The multiple partitions divide the chamber of the sterilization box into multiple sterilization chambers, and heaters are provided in the multiple sterilization chambers. After the multiple partitions divide the chamber of the sterilization box into multiple sterilization chambers, the multiple heaters in the sterilization chambers heat the sterilization water therein respectively, so that the water temperature in the multiple sterilization chambers is different, thereby achieving a comprehensive sterilization effect.

[0007] Preferably, it also includes multiple temperature probes, which are installed on the outer wall of the sterilization box, and the probes of the multiple temperature probes are respectively extended into the multiple sterilization chambers in the cavity of the sterilization box, and the multiple temperature probes are respectively electrically connected to the controllers of the multiple heaters; the multiple temperature probes respectively detect the temperature of the sterilization water in the multiple sterilization chambers in the cavity of the sterilization box, and control the power of the multiple heaters according to the detected water temperature to keep the water temperature at the set temperature, thereby improving the sterilization efficiency.

[0008] Preferably, it also includes a water pump, a water pipe and multiple nozzles. The water pump is installed outside the sterilization box, the water inlet pipe of the water pump extends into the bottom of the chamber of the sterilization box, the water outlet of the water pump is connected to the lower end of the water pipe, and multiple nozzles are set at the upper end of the water pipe. The multiple nozzles are located at the top of the chamber of the sterilization box; the multiple nozzles are located above the liquid level of the sterilization water in the chamber of the sterilization box, the water pump draws out the sterilization water in the chamber of the sterilization box and transports it to the multiple nozzles through the water pipe, and the multiple nozzles spray the sterilization water to rinse and preheat the material basket on the upper part of the mesh belt.

[0009] Preferably, a hot air blower is also included, which is installed below the inlet and outlet of the sterilization box, with the air outlet of the hot air blower facing the left part of the mesh belt; the hot air blower blows out hot air to dry the material basket output from the left part of the mesh belt, so as to prevent the mesh belt and the material basket from bringing out the sterilization water and causing external contamination of the sterilization box.

[0010] The two rotating plates are respectively rotatably connected to the two rotating shafts, and baffles are respectively provided at the inner ends of the two rotating plates, which press the right ends of the basket cover against the right ends of the basket cover. When the basket brings the products that have been sterilized out of the sterilization box, the opening of the basket faces downward, and the two rotating plates are rotated to separate the two baffles from the basket cover, and the basket cover is opened, so that the products fall out, thereby realizing rapid unloading.

[0011] Preferably, it also includes two torsion springs, two shift rods and two baffle rods, the two rotating plates are elastically connected to the two rotating shafts through the two torsion springs, two shift rods are provided at the outer ends of the two rotating plates, the two baffle rods are respectively installed below the front and rear sides of the left end of the frame, the two baffle rods are located outside the sterilization box, and the two baffle rods respectively block the outer ends of the two shift rods; when the basket body moves out of the inlet and outlet of the sterilization box, the outer ends of the two shift rods are respectively blocked by the two baffle rods, thereby driving the two rotating plates to rotate around the two rotating shafts, so that the two baffles are disengaged from the basket cover, realizing automatic opening and automatic unloading of the basket cover, and when the two shift rods are disengaged from the two baffle rods, the elastic force of the two torsion springs causes the two rotating plates to rotate and reset, which has good practicality.

[0012] Compared with the prior art, the beneficial effects of the present invention are: compared with the prior art, the right part of the mesh belt is folded in multiple layers, thereby effectively shortening the length of the site occupied by the sterilization box, thereby reducing the floor space of the equipment, which is conducive to the layout of small production workshops and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is an axonometric structural diagram of the present utility model;

[0015] Figure 3 This is a schematic diagram of the axonometric structure of the present invention when viewed from above;

[0016] Figure 4 It is a structural diagram of the material basket;

[0017] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure at B in the middle;

[0018] Figure 6 yes Figure 3 Schematic diagram of the locally enlarged structure at point A in the middle.

[0019] Markings in the accompanying drawings: 1. Sterilizer; 2. Heater; 3. Frame; 4. Sprocket 1; 5. Sprocket 2; 6. Mesh belt; 7. Chain 1; 8. Chain 2; 9. Partition; 10. Temperature probe; 11. Water pump; 12. Water pipe; 13. Nozzle; 14. Hot air blower; 15. Basket; 16. Basket cover; 17. Rotating shaft; 18. Rotating plate; 19. Baffle; 20. Torsion spring; 21. Lever; 22. Baffle. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention. Example 1

[0021] like Figures 1 to 3As shown, a mesh-belt pasteurizer includes a sterilization box 1 and a heater 2. A chamber is set inside the sterilization box 1, and the heater 2 is installed in the chamber; it also includes a frame 3, multiple sprockets 1 4, multiple sprockets 2 5, a mesh belt 6, a chain 1 7, a chain 2 8 and multiple material baskets. An inlet and outlet are set on the upper part of the left end surface of the sterilization box 1, and the inlet and outlet are connected to the chamber. The frame 3 is installed outside the sterilization box 1. Multiple sprockets 1 4 and multiple sprockets 2 5 are rotatably set on the frame 3. Multiple material baskets are evenly arranged on the outer wall of the mesh belt 6. Chains 1 7 and chains 2 8 are set on the left and right sides of the mesh belt 6. Multiple sprockets 1 4 are engaged with two chains 1 7. Multiple sprockets 1 4 support and guide the mesh belt 6 from the inside and make one end of the mesh belt 6 extend out of the left side of the sterilization box 1 through the inlet and outlet. Multiple sprockets 2 5 are engaged with two chains 2 8. Multiple sprockets 2 5 support the guide mesh belt 6 from the outside, and multiple sprockets 1 4 and multiple sprockets 2 5 cooperate to make the right part of the mesh belt 6 form a multi-layer horizontal conveying channel 1 arranged up and down in the chamber of the sterilization box 1, and at the same time, multiple sprockets 1 4 and multiple sprockets 2 5 cooperate to make the left part of the mesh belt 6 form a vertically arranged conveying channel 2 in the chamber of the sterilization box 1; it also includes multiple partitions 9, multiple partitions 9 are horizontally installed in the chamber of the sterilization box 1, and multiple partitions 9 divide the chamber of the sterilization box 1 into multiple sterilization chambers, and heaters 2 are provided in the multiple sterilization chambers; it also includes multiple temperature probes 10, multiple temperature probes 10 are installed on the outer wall of the sterilization box 1, and the probes of the multiple temperature probes 10 are respectively extended into the multiple sterilization chambers of the chamber of the sterilization box 1, and the multiple temperature probes 10 are respectively electrically connected to the controllers of the multiple heaters 2.

[0022] During operation, sterilization water is added to the chamber of the sterilization box 1. After the multiple partitions 9 divide the chamber of the sterilization box 1 into multiple sterilization chambers, the multiple heaters 2 in the sterilization chamber heat the sterilization water respectively, so that the water temperature in the multiple sterilization chambers is different, achieving a comprehensive sterilization effect. The multiple temperature probes 10 respectively detect the temperature of the sterilization water in the multiple sterilization chambers of the chamber of the sterilization box 1, and control the power of the multiple heaters 2 according to the detected water temperature to keep the water temperature at the set temperature. The products to be sterilized are placed from the left side of the sterilization box 1 into the material basket at the left end of the mesh belt 6. The multiple sprockets 1 4 and the multiple sprockets 2 5 drive the mesh belt 6 to rotate clockwise, so that the mesh belt 6 drives Multiple material baskets enter the chamber through the inlet and outlet of the sterilization box 1, and are driven by the right part of the mesh belt 6 to move horizontally and downward layer by layer along the conveying channel 1, so that the material baskets gradually sink into the sterilization water and are soaked in the sterilization water for a sufficiently long time. The material baskets reach the left part of the mesh belt 6 and rise through the vertical conveying channel 2 and are output to the outside of the left side of the sterilization box 1 through the inlet and outlet of the sterilization box 1. The material baskets are opened to discharge the sterilized products and prepare for the next loading. Compared with the prior art, the right part of the mesh belt 6 is folded in multiple layers, thereby effectively shortening the length of the site occupied by the sterilization box 1, thereby reducing the floor space of the equipment, which is conducive to the layout of small production workshops. Example 2

[0023] like Figures 1 to 3 As shown, on the basis of Example 1, it also includes a water pump 11, a water pipe 12 and a plurality of nozzles 13. The water pump 11 is installed outside the sterilization box 1, and the water inlet pipe of the water pump 11 extends into the bottom of the chamber of the sterilization box 1. The water outlet of the water pump 11 is connected to the lower end of the water pipe 12, and a plurality of nozzles 13 are set at the upper end of the water pipe 12. The plurality of nozzles 13 are located at the top of the chamber of the sterilization box 1; it also includes a hot air blower 14, which is installed below the inlet and outlet of the sterilization box 1, and the air outlet of the hot air blower 14 faces the left part of the mesh belt 6.

[0024] Multiple nozzles 13 are located above the liquid level of the sterilizing water in the chamber of the sterilization box 1. The water pump 11 draws the sterilizing water out of the chamber of the sterilization box 1 and transports it to the multiple nozzles 13 through the water pipe 12. The multiple nozzles 13 spray the sterilizing water to rinse and preheat the material basket on the upper part of the mesh belt 6. The hot air blower 14 blows out hot air to dry the material basket output from the left part of the mesh belt 6 to prevent the mesh belt 6 and the material basket from bringing out the sterilizing water and causing external contamination of the sterilization box 1. Example 3

[0025] like Figures 4 to 6 As shown, on the basis of Example 1, the material basket includes a basket body 15, a basket cover 16, two rotating shafts 17, two rotating plates 18 and two baffles 19. The top of the basket body 15 is provided with an opening, the left side of the basket cover 16 is hinged to the left side of the top of the basket body 15, and the right side of the basket cover 16 is openably connected to the top of the basket body 15. The basket cover 16 closes the opening of the basket body 15. The basket body 15 and the basket cover 16 are both composed of strip materials arranged horizontally and vertically. The two rotating shafts 17 are respectively provided at the front and rear parts of the right side of the basket body 15, and the two rotating plates 18 are respectively connected to the two baffles 19. The rotating shaft 17 is rotatably connected, and baffles 19 are provided at the inner ends of the two rotating plates 18. The two baffles 19 respectively press the right end of the basket cover 16; it also includes two torsion springs 20, two levers 21 and two baffles 22. The two rotating plates 18 are elastically connected to the two rotating shafts 17 through the two torsion springs 20. Two levers 21 are provided at the outer ends of the two rotating plates 18. The two baffles 22 are respectively installed below the front and rear sides of the left end of the frame 3. The two baffles 22 are located outside the sterilization box 1, and the two baffles 22 respectively block the outer ends of the two levers 21.

[0026] Open the basket cover 16 and place the product into the basket body 15. Use the basket cover 16 to close the opening of the basket body 15, so that the two rotating plates 18 rotate around the two rotating shafts 17, so that the two baffles 19 respectively press the right end of the basket cover 16 against the right end of the basket body 15. When the basket body 15 brings the products that have been sterilized out of the sterilization box 1, the opening of the basket body 15 faces downward. When the basket body 15 moves out of the entrance and exit of the sterilization box 1, the outer ends of the two driving rods 21 are respectively blocked by the two baffles 22, thereby driving the two rotating plates 18 to rotate around the two rotating shafts 17, so that the two baffles 19 are disengaged from the basket cover 16, realizing automatic opening of the basket cover 16 and automatic and rapid unloading. When the two driving rods 21 are disengaged from the two baffles 22, the elastic force of the two torsion springs 20 causes the two rotating plates 18 to rotate and reset.

[0027] like Figures 1 to 6 As shown, a mesh belt pasteurizer of the present invention, when working, first adds sterilizing water into the chamber of the sterilization box 1, and multiple heaters 2 heat the sterilizing water in multiple sterilization chambers to the temperature required for pasteurization, and puts the products to be sterilized from the left side of the sterilization box 1 into the basket 15 at the left end of the mesh belt 6, and uses the basket cover 16 to close the opening of the basket 15, so that the two rotating plates 18 rotate around the two rotating shafts 17, so that the two baffles 19 respectively press the right end of the basket cover 16 onto the right end of the basket 15, and then multiple sprockets 4 and multiple sprockets 5 drive the mesh belt 6 to rotate clockwise, so that the mesh belt 6 drives multiple baskets 15 to enter the chamber through the inlet and outlet of the sterilization box 1, and multiple nozzles 13 spray sterilizing water to rinse and preheat the material baskets on the upper part of the mesh belt 6, and on the right side of the mesh belt 6 Driven by the upper and lower parts, the basket 15 moves horizontally and downward layer by layer along the conveying channel 1, so that the basket 15 gradually sinks into the sterilization water and is soaked in the sterilization water for a sufficiently long time. Then the basket 15 reaches the left part of the mesh belt 6 and rises through the vertical conveying channel 2 and is output to the outside of the left side of the sterilization box 1 through the inlet and outlet of the sterilization box 1. The hot air blower 14 blows out hot air to dry the material basket output from the left part of the mesh belt 6. The outer ends of the two driving rods 21 are respectively blocked by the two baffles 22, thereby driving the two rotating plates 18 to rotate around the two rotating shafts 17, so that the two baffles 19 are disengaged from the basket cover 16, realizing automatic opening and automatic unloading of the basket cover 16. Finally, when the two driving rods 21 are disengaged from the two baffles 22, the elastic force of the two torsion springs 20 causes the two rotating plates 18 to rotate and reset, preparing for the next loading.

[0028] The main functions achieved by this utility model are:

[0029] 1. Through the multi-layer folding mesh belt setting, the length of the sterilization box tank is shortened, the floor space of the equipment is reduced, which is conducive to the layout of small production workshops;

[0030] 2. Use multiple sterilization chambers and control the water temperature separately to achieve comprehensive sterilization;

[0031] 3. The basket cover can be opened automatically for automatic unloading.

[0032] The mesh-belt pasteurizer of the present invention has common mechanical installation, connection or setting methods, and any method that can achieve its beneficial effects can be implemented. The sterilization box 1, heater 2, sprocket 1 4, sprocket 2 5, sprocket 2 5, chain 1 7, chain 2 8, temperature probe 10, water pump 11, water pipe 12, nozzle 13, hot air blower 14 and torsion spring 20 of the mesh-belt pasteurizer of the present invention are purchased on the market. Technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for creative work by technicians in this field.

[0033] All technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mesh-belt pasteurizer, comprising a sterilization box (1) and a heater (2), wherein a chamber is provided inside the sterilization box (1), and the heater (2) is installed in the chamber; characterized in that: The invention also includes a frame (3), a plurality of sprockets 1 (4), a plurality of sprockets 2 (5), a mesh belt (6), a chain 1 (7), a chain 2 (8) and a plurality of material baskets. An inlet and outlet are provided on the upper portion of the left end face of the sterilization box (1), and the inlet and outlet are communicated with the chamber. The frame (3) is installed outside the sterilization box (1). A plurality of sprockets 1 (4) and a plurality of sprockets 2 (5) are rotatably provided on the frame (3). A plurality of material baskets are evenly provided on the outer wall of the mesh belt (6). Chains 1 (7) and chain 2 (8) are provided on the left and right sides of the mesh belt (6). The plurality of sprockets 1 (4) are meshed with the two chain 1s (7). The plurality of sprockets 1 (4) are meshed with the two chain 1s (7). One (4) supports the guide mesh belt (6) from the inside and makes one end of the mesh belt (6) extend to the outside of the left side of the sterilization box (1) through the inlet and outlet, and multiple sprockets (5) are engaged with two chains (8). Multiple sprockets (5) support the guide mesh belt (6) from the outside. Multiple sprockets (4) and multiple sprockets (5) cooperate to make the right part of the mesh belt (6) form a multi-layer horizontal conveying channel one arranged up and down in the chamber of the sterilization box (1). At the same time, multiple sprockets (4) and multiple sprockets (5) cooperate to make the left part of the mesh belt (6) form a vertically arranged conveying channel two in the chamber of the sterilization box (1).

2. A mesh-belt pasteurizer according to claim 1, characterized in that: It also includes a plurality of partitions (9), which are horizontally installed in the chamber of the sterilization box (1). The plurality of partitions (9) divide the chamber of the sterilization box (1) into a plurality of sterilization chambers, and heaters (2) are provided in each of the plurality of sterilization chambers.

3. A mesh-belt pasteurizer according to claim 2, characterized in that: The apparatus further comprises a plurality of temperature probes (10), the plurality of temperature probes (10) being mounted on the outer wall of the sterilization box (1), the probes of the plurality of temperature probes (10) respectively extending into the plurality of sterilization chambers of the cavity of the sterilization box (1), and the plurality of temperature probes (10) being electrically connected to the controllers of the plurality of heaters (2).

4. The mesh-belt pasteurizer according to claim 1, characterized in that: The sterilizer further comprises a water pump (11), a water pipe (12) and a plurality of nozzles (13), wherein the water pump (11) is installed outside the sterilizer (1), the water inlet pipe of the water pump (11) extends into the bottom of the chamber of the sterilizer (1), the water outlet of the water pump (11) is connected to the lower end of the water pipe (12), and the upper end of the water pipe (12) is provided with a plurality of nozzles (13), and the plurality of nozzles (13) are located at the top of the chamber of the sterilizer (1).

5. The mesh-belt pasteurizer according to claim 1, characterized in that: It also includes a hot air blower (14), which is installed below the inlet and outlet of the sterilization box (1), and the air outlet of the hot air blower (14) faces the left part of the mesh belt (6).

6. The mesh-belt pasteurizer according to claim 1, characterized in that: The material basket includes a basket body (15), a basket cover (16), two rotating shafts (17), two rotating plates (18) and two baffles (19). The top of the basket body (15) is provided with an opening. The left side of the basket cover (16) is hinged to the left side of the top of the basket body (15). The right side of the basket cover (16) is openably connected to the top of the basket body (15). The basket cover (16) closes the opening of the basket body (15). The basket body (15) and the basket cover (16) are both composed of strip materials arranged horizontally and vertically. The two rotating shafts (17) are respectively provided at the front and rear parts of the right side of the basket body (15). The two rotating plates (18) are respectively rotatably connected to the two rotating shafts (17). The inner ends of the two rotating plates (18) are provided with baffles (19). The two baffles (19) respectively press the right ends of the basket cover (16).

7. The mesh-belt pasteurizer according to claim 6, characterized in that: The invention also includes two torsion springs (20), two shifting rods (21) and two blocking rods (22). The two rotating plates (18) are elastically connected to the two rotating shafts (17) through the two torsion springs (20). Two shifting rods (21) are provided at the outer ends of the two rotating plates (18). The two blocking rods (22) are respectively installed below the front and rear sides of the left end of the frame (3). The two blocking rods (22) are located outside the sterilization box (1). The two blocking rods (22) respectively block the outer ends of the two shifting rods (21).

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