Tea concentrated solution freezing extraction device

Abstract

The utility model belongs to the technical field of tea concentrated solution freezing extraction, and discloses a tea concentrated solution freezing extraction device. The device comprises a freezing box, the top of the freezing box communicates with a liquid inlet pipe, two mounting boxes are symmetrically and fixedly connected to the inner bottom wall of the freezing box, freezing equipment is arranged in the mounting boxes, an auxiliary disinfection assembly is arranged in the freezing box, and an arc-shaped first guide plate is fixedly connected between the front inner side wall and the rear inner side wall of the freezing box; the left end of the first guide plate is low, the right end of the first guide plate is high, a cooling assembly is connected to the bottom of the first guide plate, and through the arranged auxiliary disinfection assembly, a tea concentrated solution can make more sufficient contact with ultraviolet light emitted by multiple rows of ultraviolet disinfection lamps installed at the bottoms of the first installation plate and the second installation plate in the flowing and freezing process in the freezing box; therefore, bacteria, viruses and other microorganisms harmful to the human body contained in the tea concentrated solution can be killed more thoroughly, and the sanitary quality and quality of the tea product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tea concentrate freezing extraction technical field, especially in kind of tea concentrate freezing extraction device. BACKGROUND

[0002] Freezing extraction is a kind of commonly used processing technology in tea processing process, and its principle is: tea concentrate is frozen to minus 40 DEG C, then in the vacuum environment, the water in frozen solid will directly sublimate into water vapor, thereby obtaining porous wafer instant tea product.

[0003] In order to ensure that the hygiene quality of instant tea product extracted by freezing reaches the standard, the tea concentrate is effectively and sufficiently disinfected to kill bacteria and viruses and other microorganisms harmful to human body in the tea concentrate during the freezing extraction of the tea concentrate.

[0004] In the Chinese utility model patent with publication number CN202023237617.5, a tea concentrate freezing extraction device is disclosed, which is provided with a fixed support, and the fixed support is provided with an ultraviolet disinfection lamp, which disinfects the tea concentrate flowing out of the discharge nozzles through the ultraviolet disinfection lamp.

[0005] According to the related technology in the above, the inventors believe that the following defects exist: after the concentrate flows out of the discharge nozzle, it directly falls on the metal filter screen on the fiber groove, and then passes through the metal filter screen into the cooling channel for freezing, which limits the time of concentrate receiving ultraviolet lamp irradiation, so it cannot ensure that the bacteria and viruses and other microorganisms in the concentrate are completely killed, resulting in poor disinfection effect. UTILITY MODEL CONTENT

[0006] In order to solve the above problems, the utility model provides a tea concentrate freezing extraction device.

[0007] The above technical purpose of the utility model is realized by the following technical scheme: a tea concentrate freezing extraction device, comprising a freezing box, the top of the freezing box is communicated with a liquid inlet pipe, two installation boxes are fixedly connected on the inner bottom wall of the freezing box in symmetry, a freezing equipment is arranged in the installation box, an auxiliary disinfection assembly is arranged in the freezing box, an arc-shaped first guide plate is fixedly connected between the front and rear inner side walls of the freezing box, the left end of the first guide plate is lower than the right end, a cooling assembly is connected to the bottom of the first guide plate, a first mounting plate and a second mounting plate are fixedly connected between the front and rear inner side walls of the freezing box, a plurality of ultraviolet disinfection lamps are installed on the bottom of the first mounting plate and the second mounting plate, and a vacuum extraction pipe is communicated with the back of the freezing box.

[0008] The auxiliary disinfection assembly can make the tea concentrate more fully contact with the ultraviolet light emitted by the ultraviolet disinfection lamp.

[0009] By adopting the technical scheme, the auxiliary disinfection assembly can make the tea concentrate in the freezing tank flow and freeze more fully and sufficiently contact the multiple rows of ultraviolet disinfection lamps installed at the bottom of the first mounting plate and the second mounting plate, so that the bacteria and viruses in the tea concentrate can be more thoroughly killed, and the health quality and quality of the tea product are improved.

[0010] Further, the auxiliary disinfection assembly comprises a second guide plate fixedly connected between the front and rear inner side walls of the freezing tank, the second guide plate is a slope with the left end higher than the right end and is located directly above the first guide plate, multiple guide pipes are fixedly connected at the top of the second guide plate from front to back, liquid inlets are formed at the top of the left end of the guide pipes, the number of the liquid inlets is equal to the number of the guide pipes and the liquid inlets are located directly above the guide pipes, the height of the guide pipes gradually decreases from left to right, and the width of the guide pipes gradually increases from left to right.

[0011] By adopting the technical scheme, the tea concentrate can be evenly spread on the top surface of the second guide plate after flowing through the guide pipes, so that the contact area of the concentrate and the ultraviolet light emitted by the multiple rows of ultraviolet disinfection lamps at the bottom of the first mounting plate is increased, the sterilization effect on the tea concentrate is ensured, and the reliability of the device is effectively improved.

[0012] Further, the auxiliary disinfection assembly further comprises multiple rows of protrusions fixedly connected at the top surface of the first guide plate from front to back, the front-to-back thickness of the protrusions gradually increases from top to bottom, the height of the protrusions gradually increases from the left and right sides to the middle, the number of the liquid outlet ends of the liquid pipes is equal to the number of the rows of protrusions, and the liquid outlet ends of the liquid pipes are respectively aligned with the right side surfaces of the rightmost protrusions in the rows of protrusions.

[0013] By adopting the technical scheme, the multiple rows of protrusions can make the tea concentrate flowing from the right end to the left end of the first guide plate flow through the outer surfaces of the protrusions, so as to further increase the spreading area of the tea concentrate, make the tea concentrate more fully contact the ultraviolet light emitted by the multiple rows of ultraviolet disinfection lamps at the bottom of the second mounting plate, and further improve the sterilization effect on the tea concentrate.

[0014] Further, the number of the protrusions in each row is multiple, the spacing of the multiple protrusions in each row gradually increases from right to left, and the highest height of the multiple protrusions in each row gradually decreases from right to left.

[0015] By adopting the technical scheme, the spacing of the plurality of protrusions in each row gradually increases from right to left, so that the tea concentrate has a longer energy storage time when flowing from right to left to improve the flowing speed of the tea concentrate after flowing down from the previous protrusion, so that the tea concentrate can flow smoothly to the outer surface of the protrusion close to the left side, ensure that the flowing area of the tea concentrate is expanded, increase the contact area of the ultraviolet light and the tea concentrate, and greatly improve the sterilization effect on the tea concentrate.

[0016] Further, the cooling assembly comprises a rectangular partition layer fixedly connected to the bottom surface of the first guide plate, the bottom of the rectangular partition layer is fixedly connected with a third guide plate, the third guide plate has the same shape as the first guide plate and is located directly below the first guide plate, and the cooling assembly comprises a medium inflow pipe and a medium outflow pipe which are respectively communicated with the front and rear side surfaces of the freezing box and penetrate through the rectangular partition layer and are fixedly inserted into the side wall of the rectangular partition layer.

[0017] By adopting the technical scheme, the cooling medium is sent into the internal space of the rectangular partition layer through the medium inflow pipe, and then the cooling medium and the tea concentrate flowing through the top of the first guide plate exchange heat and are discharged from the medium outflow pipe, so that the cooling medium can circulate and exchange heat, and the cooling effect on the tea concentrate is improved.

[0018] The application also discloses a tea concentrate freezing and extracting device, the freezing box is provided with an auxiliary cooling assembly, the auxiliary cooling assembly comprises a plurality of rows of through cavities which are equally and forwardly arranged on the bottom of the first guide plate, the auxiliary cooling assembly further comprises a plurality of grooves which are arranged on the bottom of the protrusion, the grooves have the same shape as the protrusion, the bottom ends of the plurality of rows of grooves are respectively communicated with the plurality of rows of through cavities, the auxiliary cooling assembly further comprises a plurality of rows of insertion blocks which are fixedly connected to the top of the third guide plate from front to back, the plurality of rows of insertion blocks are respectively inserted into the plurality of rows of grooves and gaps are left between the outer side surfaces of the insertion blocks and the inner side walls of the grooves, and the insertion blocks and the grooves are matched in shape.

[0019] By adopting the technical scheme, the insertion blocks are inserted into the grooves, the insertion blocks and the grooves are matched in shape, and gaps are left between the outer side surfaces of the insertion blocks and the inner side walls of the grooves, so that the cooling medium can be in more sufficient contact with the inner side walls of the grooves, thereby better cooling the tea concentrate flowing through the outer surface of the protrusion, so that the contact area of the cooling medium and the tea concentrate is larger, the cooling effect on the tea concentrate is enhanced, and the freezing and extracting efficiency of the device is improved.

[0020] In summary, the utility model has the following beneficial effects:

[0021] 1、The auxiliary disinfection assembly can make the tea concentrate in the freezing box flow more fully and contact the ultraviolet light emitted by the multiple rows of ultraviolet disinfection lamps installed at the bottom of the first mounting plate and the second mounting plate, so that the bacteria and viruses contained in the tea concentrate can be more thoroughly killed, and the health quality and quality of the tea product are improved.

[0022] 2、The multiple rows of protrusions arranged at the top of the first guide plate can make the tea concentrate have a longer energy storage time when flowing from right to left, so as to improve the flow speed of the tea concentrate after flowing down from the previous protrusion, so that the tea concentrate can smoothly flow to the outer surface of the protrusion close to the left side, the flow area of the tea concentrate is ensured to be expanded, the contact area between the ultraviolet light and the tea concentrate is increased, and the disinfection effect on the tea concentrate is greatly improved.

[0023] 3、The auxiliary cooling assembly can make the contact area between the cooling medium and the tea concentrate larger, so as to enhance the cooling effect on the tea concentrate and improve the freezing extraction efficiency of the device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a first structural schematic view of an embodiment of the utility model;

[0025] Figure 2 is a second structural schematic view of an embodiment of the utility model;

[0026] Figure 3 is a sectional view structural schematic view of an embodiment of the utility model;

[0027] Figure 4 is a first local structural schematic view of an embodiment of the utility model;

[0028] Figure 5 is a second local structural schematic view of an embodiment of the utility model;

[0029] Figure 6 is an A place enlarged schematic view in Figure 3 of an embodiment of the utility model.

[0030] In the drawing: 1, freezing box; 101, liquid inlet pipe; 102, sealing door; 2, mounting box; 3, auxiliary disinfection assembly; 31, second guide plate; 32, guide pipe; 33, liquid falling pipe; 34, protrusion; 4, first guide plate; 41, through hole; 5, cooling assembly; 51, rectangular partition layer; 52, third guide plate; 53, medium inflow pipe; 54, medium outflow pipe; 6, first mounting plate; 7, second mounting plate; 8, ultraviolet disinfection lamp; 9, auxiliary cooling assembly; 91, through cavity; 92, groove; 93, plug; 10, vacuumizing pipe. Detailed Implementation

[0031] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] like Figures 1-6 As shown in the embodiment of this application, a frozen extraction device for tea concentrate is disclosed, including a freezing box 1. The top of the freezing box 1 is connected to a liquid inlet pipe 101. Two mounting boxes 2 are symmetrically fixedly connected to the bottom wall of the freezing box 1. The mounting boxes 2 are equipped with freezing equipment. The freezing box 1 is equipped with an auxiliary disinfection component 3. An arc-shaped first guide plate 4 is fixedly connected between the front and rear inner side walls of the freezing box 1. Several through holes 41 are opened on the left side of the first guide plate 4. The bottom of the several through holes 41 penetrates the bottom surface of the first guide plate 4. The left end of the first guide plate 4 is lower than the right end. A cooling component 5 is connected to the bottom of the first guide plate 4. A first mounting plate 6 and a second mounting plate 7 are fixedly connected between the front and rear inner side walls of the freezing box 1. Multiple rows of ultraviolet disinfection lamps 8 are installed at the bottom of the first mounting plate 6 and the second mounting plate 7. A vacuum tube 10 is connected to the back of the freezing box 1.

[0033] The freezer 1 has a hinged sealing door 102 on the front, which makes it easy for staff to take out the tea products after freezing and extraction.

[0034] The auxiliary disinfection component 3 allows the tea concentrate to come into more complete contact with the ultraviolet light emitted by the ultraviolet disinfection lamp 8.

[0035] By adopting the above technical solution, the auxiliary disinfection component 3 enables the tea concentrate to come into more thorough contact with the multi-row ultraviolet disinfection lamps 8 installed at the bottom of the first mounting plate 6 and the second mounting plate 7 during the flow freezing process in the freezer 1. This allows for a more thorough elimination of harmful microorganisms such as bacteria and viruses contained in the tea concentrate, thereby improving the hygiene and quality of the tea product.

[0036] refer to Figures 3-5The auxiliary disinfection assembly 3 comprises a second guide plate 31 fixedly connected between the front and rear inner side walls of the freezer 1, the second guide plate 31 is a slope with the left end being higher than the right end and is located directly above the first guide plate 4, the top of the second guide plate 31 is fixedly connected with a plurality of guide pipes 32 from front to back at equal intervals, the left end of the top of the guide pipe 32 is provided with a liquid inlet, the number of the liquid inlet pipe 101 is equal to the number of the guide pipe 32 and is located directly above the liquid inlet of the top of the guide pipe 32, the height of the guide pipe 32 gradually decreases from left to right, the width of the guide pipe 32 gradually increases from left to right, and the bottom surface of the left side of the second guide plate 31 is communicated with a plurality of liquid falling pipes 33 from front to back, and the liquid outlet of the liquid falling pipe 33 is aligned with the top surface of the first guide plate 4.

[0037] By adopting the above technical scheme, the tea concentrate can be evenly spread on the top surface of the second guide plate 31 after flowing through the guide pipe 32, thereby increasing the contact area of the concentrate and the ultraviolet light emitted by the plurality of ultraviolet disinfection lamps 8 on the bottom of the first mounting plate 6, ensuring the sterilization effect of the tea concentrate, and effectively improving the reliability of the device.

[0038] Reference Figures 3-6 The auxiliary disinfection assembly 3 further comprises a plurality of rows of protrusions 34 fixedly connected on the top surface of the first guide plate 4 from front to back at equal intervals, the front and rear thicknesses of the protrusion 34 gradually increase from top to bottom, the height of the protrusion 34 gradually increases from the left and right sides to the middle, the number of the liquid falling pipe 33 is equal to the number of rows of the protrusion 34, and the liquid outlet of the liquid falling pipe 33 is respectively aligned with the right side surface of the rightmost protrusion 34 in the plurality of rows of protrusions 34.

[0039] By adopting the above technical scheme, the plurality of rows of protrusions 34 can make the tea concentrate flowing from the right end to the left end of the first guide plate 4 flow through the outer surface of the protrusion 34, thereby further increasing the spreading area of the tea concentrate, making the tea concentrate more fully contact with the ultraviolet light emitted by the plurality of ultraviolet disinfection lamps 8 on the bottom of the second mounting plate 7, and further improving the sterilization effect of the tea concentrate.

[0040] Reference Figures 3-5 The number of each row of protrusions 34 is a plurality, the spacing of each row of a plurality of protrusions 34 gradually increases from right to left, and the highest height of each row of a plurality of protrusions 34 gradually decreases from right to left.

[0041] By adopting the above technical scheme, the spacing of each row of a plurality of protrusions 34 gradually increases from right to left, which can make the tea concentrate have a longer energy storage time when flowing from right to left to improve the flowing speed of the tea concentrate after flowing down from the previous protrusion 34, so that the tea concentrate can flow smoothly to the outer surface of the protrusion 34 close to the left side, ensuring that the flowing area of the tea concentrate is expanded, increasing the contact area of the ultraviolet light and the tea concentrate, and greatly improving the disinfection effect of the tea concentrate.

[0042] ReferenceFigure 3 and Figure 6 The cooling assembly 5 comprises a rectangular partition 51 fixedly connected to the bottom surface of the first guide plate 4, the bottom of the rectangular partition 51 is fixedly connected with a third guide plate 52, the third guide plate 52 is identical in shape with the first guide plate 4 and is located directly below the first guide plate 4, the cooling assembly 5 comprises a medium inflow pipe 53 and a medium outflow pipe 54 respectively connected to the front and rear side surfaces of the freezer 1, the medium inflow pipe 53 and the medium outflow pipe 54 both penetrate through the rectangular partition 51 and are fixedly plugged into the side wall of the rectangular partition 51, the cooling assembly 5 can only preliminarily cool the tea concentrate, and cannot make the tea concentrate be frozen into solid state.

[0043] By using the above technical scheme, the cooling medium is sent into the internal space of the rectangular partition 51 through the medium inflow pipe 53, then the cooling medium exchanges heat with the tea concentrate flowing through the top of the first guide plate 4 and is discharged from the medium outflow pipe 54, so that the cooling medium can circulate and exchange heat, thereby improving the cooling effect on the tea concentrate.

[0044] The use principle of the tea concentrate freezing and extracting device in the embodiment is that the tea concentrate to be frozen and extracted is respectively sent into the plurality of guide pipes 32 through the plurality of liquid inlet pipes 101, the tea concentrate is fully laid on the top surface of the second guide plate 31 under the constraint of the shape of the guide pipe 32 when flowing through the guide pipe 32, so that the contact area between the tea concentrate flowing through the top surface of the second guide plate 31 and the ultraviolet light emitted by the ultraviolet disinfection lamp 8 at the bottom of the first mounting plate 6 is increased, and the disinfection effect on the tea concentrate is enhanced.

[0045] At the same time, the cooling medium is sent into the internal space of the rectangular partition 51 through the medium inflow pipe 53, then the cooling medium exchanges heat with the tea concentrate flowing through the top of the first guide plate 4 and is discharged from the medium outflow pipe 54, so that the cooling medium can circulate and exchange heat, thereby improving the cooling effect on the tea concentrate.

[0046] Then the tea concentrate flows to the first guide plate 4 through the liquid falling pipe 33, and the tea concentrate flows through the plurality of rows of protrusions 34 when flowing along the first guide plate 4 to the left, so that the contact area between the tea concentrate and the ultraviolet light emitted by the ultraviolet disinfection lamp 8 at the bottom of the second mounting plate 7 is further increased, and the disinfection effect on the tea concentrate is greatly enhanced.

[0047] At the same time, the inside of the freezer 1 is vacuumized through the vacuumizing pipe 10, then the tea concentrate falls into the bottom of the freezer 1 through the through hole 41 in the first guide plate 4, and then the freezing and extracting work of the tea is completed under the freezing action of the freezing equipment, finally the sealing door 102 is opened to take out the frozen and extracted tea product, and the extracting work is completed.

[0048] The tea concentrate freezing extraction device is characterized in that the freezing box 1 is internally provided with an auxiliary cooling assembly 9, the auxiliary cooling assembly 9 comprises a plurality of rows of through cavities 91 which are equidistantly arranged on the bottom of the first guide plate 4 from front to back, the auxiliary cooling assembly 9 further comprises a plurality of grooves 92 which are arranged on the bottom of the protruding block 34, the shape of the groove 92 is the same as that of the protruding block 34, the bottom ends of the plurality of grooves 92 are respectively connected with the plurality of rows of through cavities 91, the auxiliary cooling assembly 9 further comprises a plurality of rows of insertion blocks 93 which are equidistantly and fixedly connected on the top of the third guide plate 52 from front to back, the plurality of rows of insertion blocks 93 are respectively inserted into the plurality of grooves 92 and a gap is left between the outer side surface of the insertion block 93 and the inner side wall of the groove 92, and the shape of the insertion block 93 is matched with that of the groove 92.

[0049] By adopting the above technical scheme, the insertion block 93 is inserted into the groove 92, the shape of the insertion block 93 is matched with that of the groove 92, and a gap is left between the outer side surface of the insertion block 93 and the inner side wall of the groove 92, so that the cooling medium can be more fully contacted with the inner side wall of the groove 92, thereby better cooling the tea concentrate flowing through the outer surface of the protruding block 34, so that the contact area of the cooling medium and the tea concentrate is larger, the cooling effect of the tea concentrate is enhanced, and the freezing extraction efficiency of the device is improved.

[0050] The preferred embodiments of the present application have been described above, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical scheme falling within the idea of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application can also be considered as the protection scope of the present application.

Claims

1. A tea leaf concentrate freeze extraction apparatus comprising a freeze tank (1) characterised by: The utility model provides a refrigeration box (1) top communication has the liquid inlet pipe (101), two installation boxes (2) are fixedly connected to the inside bottom wall in the refrigeration box (1) symmetry, be equipped with refrigeration equipment in the installation box (2), be equipped with auxiliary sterilization subassembly (3) in the refrigeration box (1), the first guide plate (4) of arc is fixedly connected between the inside side wall of refrigeration box (1) front and rear, the first guide plate (4) left end is low right end high, the cooling subassembly (5) is connected to the first guide plate (4) bottom, first mounting plate (6) and second mounting plate (7) are fixedly connected between the inside side wall of refrigeration box (1) front and rear, the first mounting plate (6) and second mounting plate (7) bottom are all installed with multiple rows ultraviolet disinfection lamp (8), The auxiliary sterilization subassembly (3) can make tea concentrate more fully contact with ultraviolet light emitted by the ultraviolet disinfection lamp (8).

2. The tea concentrate freeze extraction apparatus of claim 1, wherein: The auxiliary sterilization subassembly (3) includes the second guide plate (31) fixedly connected between the inside side wall of refrigeration box (1) front and rear, the second guide plate (31) is the inclined plane of left end high right end low and is located the just above of first guide plate (4), the top of second guide plate (31) is fixedly connected with multiple guide pipes (32) from front to back, the left end top of guide pipe (32) is provided with liquid inlet, the number of liquid inlet pipe (101) and guide pipe (32) is equal and respectively located the just above of multiple guide pipe (32) top liquid inlet, the height of guide pipe (32) gradually reduces from left to right, the width of guide pipe (32) gradually increases from left to right, the bottom surface left side of second guide plate (31) is communicated with multiple liquid falling pipes (33) from front to back, the liquid outlet end of multiple liquid falling pipes (33) is aligned with the top surface of first guide plate (4).

3. The tea concentrate freeze extraction apparatus of claim 2, wherein: The auxiliary sterilization subassembly (3) further includes multiple rows of protrusions (34) fixedly connected on the top surface of first guide plate (4) from front to back, the front and back thickness of protrusion (34) gradually increases from top to bottom, the height of protrusion (34) gradually increases from left and right sides to the middle, the number of liquid falling pipe (33) and the number of rows of protrusions (34) are equal, and the liquid outlet end of liquid falling pipe (33) is aligned with the right side surface of the rightmost protrusion (34) in the multiple rows of protrusions (34).

4. The tea concentrate freeze extraction apparatus of claim 3, wherein: The number of protrusions (34) in each row is multiple, the spacing of the multiple protrusions (34) in each row gradually increases from right to left, and the highest height of the multiple protrusions (34) in each row gradually decreases from right to left.

5. A device for the cold extraction of tea concentrate according to claim 4, characterised in that: The cooling subassembly (5) includes a rectangular partition layer (51) fixedly connected to the bottom surface of the first guide plate (4), a third guide plate (52) fixedly connected to the bottom of the rectangular partition layer (51), the third guide plate (52) has the same shape as the first guide plate (4) and is located just below the first guide plate (4), and the cooling subassembly (5) includes a medium inflow pipe (53) and a medium outflow pipe (54) communicated on the front and rear side surfaces of the refrigeration box (1), respectively, the medium inflow pipe (53) and the medium outflow pipe (54) penetrate through the rectangular partition layer (51) and are fixedly inserted into the side walls of the rectangular partition layer (51).

6. The tea concentrate freeze extraction apparatus of any one of claims 1 or 5, wherein: The freezing box (1) is internally provided with an auxiliary cooling assembly (9), the auxiliary cooling assembly (9) includes multiple rows of through cavities (91) equidistantly opened in the bottom of the first guide plate (4) from front to back, the auxiliary cooling assembly (9) further includes recesses (92) opened in the bottom of the protrusions (34), the recesses (92) are identical in shape with the protrusions (34), the bottom ends of the multiple rows of recesses (92) are respectively connected with the multiple rows of through cavities (91), the auxiliary cooling assembly (9) further includes multiple rows of plug blocks (93) fixedly connected on the top of the third guide plate (52) from front to back, the multiple rows of plug blocks (93) are respectively inserted into the multiple rows of recesses (92) and a gap is left between the outer side of the plug block (93) and the inner side wall of the recess (92), the plug block (93) and the recess (92) are matched in shape.

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