Constant-temperature fermentation vat for pickling salt-free treading pickled Chinese cabbages and fermentation method

Abstract

The constant-temperature fermentation vat comprises a bottom plate, a vat body is arranged at the upper end of the bottom plate, an empty groove is formed in the side wall of the vat body, a temperature adjusting structure is arranged on one side of the vat body, an inserting groove is formed in the lower end of a sealing cover, the edge of the upper end of the vat body is inserted into the inserting groove, and a cam graduator is located in the center of the upper end of the sealing cover. The extrusion structure comprises a threaded rod, the upper end of the threaded rod is in threaded connection with a threaded sleeve, and the net barrel is located in the cylinder body. The air outlet structure comprises a box body which is fixedly connected to the upper end of the sealing cover, a rotary lifting structure which is located on one side of the cylinder body, and a liquid drainage cylinder which is fixedly connected to the lower end of the cylinder body. Compared with the prior art, the device has the advantages that the extrusion structure is used for replacing manual treading to extrude air, preparation work before fermentation can be shortened, the interior of the cylinder body can be in a constant-temperature state, and pickled Chinese cabbages can be taken out conveniently and fermentation water can be cleaned conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of sauerkraut fermentation, in particular to a constant temperature fermentation tank for salt-free sauerkraut pickling and a fermentation method. Background Art

[0002] Sauerkraut generally refers to all kinds of sauerkraut made from green vegetables or cabbage. Sauerkraut is made through multiple processes, including removing dead leaves from the outside, washing, soaking in boiling water, fermenting in a jar, and can be eaten after a week. However, a large amount of salt needs to be added during the processing of sauerkraut, and after a long period of fermentation, nitrite will be produced. Frequent consumption of nitrite will affect human health. Therefore, salt-free sauerkraut has gradually come into everyone's view. Salt-free sauerkraut has the flavor of general sauerkraut and is healthier to eat.

[0003] However, before the fermentation of sauerkraut in white water, people need to wear special shoe covers to press the sauerkraut. Each jar of sauerkraut usually requires 2-3 people to press it to expel the air inside the sauerkraut, which results in high labor costs and low efficiency. At the same time, it is not convenient to adjust the temperature of traditional fermentation jars, and they need to be moved to a cool place during sealed fermentation to avoid affecting the fermentation of the sauerkraut. The fermentation jar is relatively deep, making it inconvenient to take out the sauerkraut after the fermentation is completed.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the invention and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a constant temperature fermentation tank and fermentation method for pickling salt-free sauerkraut. An extrusion structure is used instead of manual pressing to squeeze out air, which can shorten the preparation work before fermentation and keep the inside of the tank in a constant temperature state, making it convenient to take out the sauerkraut and clean up the fermentation water.

[0006] In order to solve the above problems, the technical solution of the present invention is: a constant temperature fermentation cylinder for pickling salt-free sauerkraut, comprising a bottom plate, a cylinder body is provided at the upper end of the bottom plate, an empty groove is provided inside the side wall of the cylinder body, a temperature regulating structure is provided on one side of the cylinder body, the temperature regulating structure comprises a water tank with a semiconductor refrigeration heat sheet, a water pump is provided at the upper end of the water tank with the semiconductor refrigeration heat sheet, a water pipe is provided at the upper end of the water pump, the other end of the water pipe is connected to the water tank with the semiconductor refrigeration heat sheet, and the water pipe is spirally coiled inside the empty groove;

[0007] A sealing cover, wherein a slot is provided at the lower end of the sealing cover, the upper edge of the cylinder body is inserted into the slot, a sealing ring is provided inside the slot, a spring telescopic rod is provided between the sealing ring and the sealing cover, and a rotatable threaded sleeve is provided at the center of the sealing cover;

[0008] A cam indexer, the cam indexer is located at the center of the upper end of the sealing cover, and the output end of the cam indexer is fixedly connected to the threaded sleeve;

[0009] An extrusion structure, the extrusion structure comprises a threaded rod, the upper end of the threaded rod is threadedly connected to a threaded sleeve, the lower end of the threaded rod is provided with a connecting plate, the lower end of the connecting plate is provided with an electric telescopic rod, the lower end of the electric telescopic rod is provided with a sleeve, a spring is provided inside the sleeve, the lower end of the sleeve is provided with an extrusion plate, and the surface of the extrusion plate is provided with a through hole;

[0010] A net barrel, wherein the net barrel is located inside the cylinder body;

[0011] An air outlet structure, the air outlet structure comprises a box body, a liquid is arranged inside the box body, the box body is fixedly connected to the upper end of the sealing cover, a connecting pipe is arranged at the lower end of the box body, an air outlet pipe is arranged at the upper end of the box body, the lower end of the connecting pipe is located inside the cylinder body, and the other end of the connecting pipe is located below the upper surface of the liquid;

[0012] A rotary lifting structure, the rotary lifting structure is located on one side of the cylinder body, the rotary lifting structure includes a shell, a motor 1, a guide plate, and a motor 2. A slidable lifting rod is provided inside the shell, a connecting plate is provided at the upper end of the lifting rod, the connecting plate is fixedly connected to the sealing cover, a plurality of groups of annular teeth are provided on the surface of the lifting rod, the motor 1 is fixedly connected to the inner wall of the shell, a gear is provided at the output end of the motor 1, the gear teeth are meshed and connected with the annular teeth, the guide plate is fixedly connected to the inside of the shell, the lower end of the lifting rod is plugged into the guide plate, the motor 2 is fixedly connected to the bottom end of the shell, a rotating shaft is provided at the output end of the upper end of the motor 2, limiting convex ribs are provided at both ends of the outer surface of the rotating shaft, the lifting rod is sleeved with the rotating shaft, and a groove matching the limiting convex rib is provided inside the lifting rod;

[0013] A liquid discharge cylinder is fixedly connected to the lower end of the cylinder body.

[0014] Furthermore, a sliding baffle is provided at the upper end of the drainage cylinder, a filter disc is provided inside the drainage cylinder, a baffle 1 is provided at the upper end of the filter disc, a rotating rod is rotatably provided inside one side of the baffle 1, a motor 3 is provided at the upper end of the rotating rod, a scraper is provided on the surface of the rotating rod, a baffle 2 is provided at the lower end of the filter disc, a receiving plate is provided under the baffle 1, a drainage pipe is provided at the lower end of the drainage cylinder, and a sliding door is provided at one side of the outer end of the drainage cylinder.

[0015] Furthermore, there are three groups of electric telescopic rods, and the three groups of electric telescopic rods are irregularly installed at the lower end of the connecting plate. The three extrusion plates have different sizes, and the through holes opened in each extrusion plate have different sizes.

[0016] Furthermore, the baffle plate 1, the scraper plate and the baffle plate 2 are all provided with through hole arcs, the baffle plate 1 is provided with a slot at one end, the motor 3 is provided with a bracket connected to the baffle plate 1 at one end, the filter plate is provided with a fan-shaped opening at one end, the baffle plate 2 has two baffle plates, the two baffle plates 2 are located at the lower end of the filter plate opening, the receiving plate is located between the two baffle plates 2, the side wall of the drainage cylinder is provided with a sliding groove for sliding the sliding door, and the sliding door is provided with a handle at one end.

[0017] Furthermore, the cam indexer includes a motor four and a turntable. The output end of the motor four is provided with a cam pair. A threaded sleeve is fixedly connected to the center of the lower end of the turntable. The circumferential surface of the turntable is provided with a cam roller used in conjunction with the cam pair.

[0018] Furthermore, a connecting block is provided on the inner side of the lower end of the sealing cover, and a cross bar for hanging objects is provided on the lower end of the connecting block.

[0019] Furthermore, an electric push rod is provided at one end of the sliding baffle, and the sliding baffle and the electric push rod are located inside the bottom wall of the cylinder body.

[0020] A fermentation method of a constant temperature fermentation tank for pickling salt-free sauerkraut, characterized in that it comprises the following steps:

[0021] Step 1: Prepare the raw materials for salt-free sauerkraut, including vegetables and fermentation water;

[0022] Step 2: Put the raw material into the cylinder body, move the sealing cover to the top of the cylinder body by rotating the lifting structure, and discharge the air inside the raw material through the cam indexer and the extrusion structure;

[0023] Step 3: The sealing cover and the cylinder body are sealed by rotating the lifting structure to carry out fermentation, and the temperature inside the cylinder body is kept constant by the temperature regulating structure, and the gas generated during fermentation is discharged through the gas outlet structure;

[0024] Step 4: After fermentation is completed, use the optional lifting structure to open the sealing cover and use the net bucket to take out the sauerkraut, leaving the fermented water inside the cylinder.

[0025] Step 5: If the fermentation water needs to be replaced, open the sliding baffle, and the fermentation water will be filtered out through the drain tube, leaving the remaining sauerkraut residue.

[0026] The advantages of the present invention compared with the prior art are:

[0027] (1) The present invention installs a cam indexer and an extrusion structure to replace manual extrusion of air from the inside of the sauerkraut, thereby shortening the pre-fermentation treatment time and saving manpower, and the extrusion area is constantly changed to improve the extrusion effect;

[0028] (2) The present invention can conveniently drive the opening and closing of the sealing cover by installing a rotating lifting structure, thereby ensuring the sealing of the cylinder body and facilitating the removal of sauerkraut. By installing a drain cylinder, the fermentation liquid can be conveniently replaced and the inside of the cylinder body can be cleaned;

[0029] (3) The present invention can ensure a constant temperature inside the cylinder by installing a temperature regulating structure, and can prevent external air from entering the fermentation cylinder by installing an air outlet structure. At the same time, the gas generated during fermentation can be discharged from the cylinder to avoid excessive pressure in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a three-dimensional Figure 1 .

[0031] Figure 2 The present invention is a three-dimensional Figure 2 .

[0032] Figure 3 The present invention is a three-dimensional Figure 3 .

[0033] Figure 4 It is a cutaway perspective view of the present invention.

[0034] Figure 5 It is an internal stereogram of the rotary lifting structure of the present invention.

[0035] Figure 6 It is an enlarged view of point A of the present invention.

[0036] Figure 7 It is an enlarged view of B of the present invention.

[0037] Figure 8 It is an enlarged view of C of the present invention.

[0038] Fig. 9 It is a diagram of the internal structure of the gas outlet structure of the present invention.

[0039] Fig.10 It is the internal structure diagram of the cylinder bottom end of the present invention.

[0040] As shown in the figure: 1. Bottom plate;

[0041] 2. Cylinder body; 201. Empty slot;

[0042] 3. Temperature regulating structure; 301. Water tank with semiconductor cooling heat sheet; 302. Water pump; 303. Water pipe;

[0043] 4. Sealing cover; 401. Slot; 402. Sealing ring; 403. Spring telescopic rod; 404. Threaded sleeve; 405. Connecting block;

[0044] 5. Cam indexer; 501. Rotating plate; 502. Cam roller; 503. Cam pair; 504. Motor 4;

[0045] 6. Extrusion structure; 601. Threaded rod; 602. Connecting plate; 603. Electric telescopic rod; 604. Sleeve; 605. Extrusion plate; 606. Through hole;

[0046] 7. Net bucket;

[0047] 8. air outlet structure; 801. box body; 802. connecting pipe; 803. liquid; 804. air outlet pipe;

[0048] 9. Rotating lifting structure; 901. Shell; 902. Lifting rod; 903. Connecting plate; 904. Ring gear; 905. Motor 1; 906. Gear; 907. Guide plate; 908. Motor 2; 909. Rotating shaft; 910. Position limiting rib;

[0049] 10. Drain cylinder; 1001. Sliding baffle; 10011. Electric push rod; 1002. Filter plate; 1003. Baffle one; 1004. Motor three; 1005. Rotating rod; 1006. Scraper; 1007. Baffle two; 1008. Receiving plate; 1009. Sliding door; 1010. Drain pipe. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0051] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0052] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0053] Embodiment 1

[0054] like Figures 1 to 10As shown, a constant temperature fermentation cylinder for salt-free sauerkraut pickling comprises a bottom plate 1, a cylinder body 2 is mounted on the upper end of the bottom plate 1, an empty groove 201 is provided inside the side wall of the cylinder body 2, a temperature regulating structure 3 is provided on one side of the cylinder body 2, the temperature regulating structure 3 comprises a water tank 301 with a semiconductor refrigeration heat sheet, the water tank 301 with a semiconductor refrigeration heat sheet is mounted on the upper end of the bottom plate 1, a water pump 302 is mounted on the upper end of the water tank 301 with a semiconductor refrigeration heat sheet, a water pipe 303 is mounted on the upper end of the water pump 302, the other end of the water pipe 303 is connected to one side of the water tank 301 with a semiconductor refrigeration heat sheet, the water pipe 303 is spirally coiled inside the empty groove 201, the water tank 301 with a semiconductor refrigeration heat sheet can heat or cool water, water flows in the empty groove 201 through the water pipe 303, the temperature inside the cylinder body 2 can be regulated by heat exchange, and the temperature inside the cylinder body 2 can be controlled to be constant by using a temperature sensor.

[0055] The cam indexer 5 is located at the center of the upper end of the sealing cover 4. A threaded sleeve 404 is installed at the output end of the cam indexer 5. The threaded sleeve 404 is rotatably installed inside the sealing cover 4. The cam indexer 5 can drive the threaded sleeve to rotate. The threaded sleeve 404 and the sealing cover 4 are connected through a bearing with good sealing performance.

[0056] The cam indexer 5 includes a motor 504, a cam pair 503 is installed at the output end of the motor 504, and the motor 504 can drive the cam pair 503 to rotate. The center of the lower end of the turntable 501 is connected to the threaded sleeve 404, and a cam roller 502 used in conjunction with the cam pair 503 is installed on the circumferential surface of the turntable 501. The rotation of the cam pair 503 drives the turntable 501 to rotate intermittently through the cam roller 502, thereby driving the threaded sleeve 404 to rotate intermittently.

[0057] The squeezing structure 6 includes a threaded rod 601, the upper end of the threaded rod 601 is threadedly connected to the threaded sleeve 404, and the squeezing structure 6 can be disassembled and installed. A connecting plate 602 is installed at the lower end of the threaded rod 601, and an electric telescopic rod 603 is installed at the lower end of the connecting plate 602. A sleeve 604 is installed at the lower end of the electric telescopic rod 603, and a spring is installed inside the sleeve 604. An squeezing plate 605 is installed at the lower end of the sleeve 604, and a through hole 606 is provided on the surface of the squeezing plate 605. When sauerkraut and water used for pickling sauerkraut are put into the cylinder body 2, the sealing cover 4 is placed above the cylinder body 2 without forming a seal with the cylinder body 2. The electric telescopic rod 603 is extended, and the sauerkraut is squeezed through the squeezing plate 605, so that the air inside the sauerkraut is discharged as much as possible. The sleeve 604 and the spring play a certain buffering role to prevent the squeezing plate 605 from damaging the sauerkraut.

[0058] There are three groups of electric telescopic rods 603, and the three groups of electric telescopic rods 603 are irregularly installed at the lower end of the connecting plate 602. The three extrusion plates 605 are of different sizes, and the through holes 606 opened in each extrusion plate 605 are of different sizes. When the electric telescopic rod 603 is extended, the cam indexer 5 is started synchronously to drive the threaded sleeve 404 to rotate, thereby driving the three groups of electric telescopic rods 603 to rotate through the threaded rod 601, and the number of cam rollers 502 of the cam indexer 5 is not a multiple of 3, so that the three groups of extrusion plates 605 can squeeze the sauerkraut at different positions inside the cylinder body 2.

[0059] A slot 401 is provided at the lower end of the sealing cover 4, and the upper edge of the cylinder body 2 is inserted into the slot 401. A sealing ring 402 is installed inside the slot 401, and a spring telescopic rod 403 is installed between the sealing ring 402 and the sealing cover 4. When the sealing cover 4 is clamped on the upper end of the cylinder body 2, the sealing ring 402 is located at the upper edge of the cylinder body 2, and the spring telescopic rod 403 is compressed, so that the sealing ring 402 fits tightly to the upper end of the cylinder body 2 to prevent external air from entering the cylinder body 2.

[0060] The gas outlet structure 8 includes a box body 801, which is fixedly mounted on the upper end of the sealing cover 4. The box body 801 is made of a transparent material. Liquid 803 is contained in the box body 801. A connecting pipe 802 is installed at the lower end of the box body 801, and an air outlet pipe 804 is installed at the upper end of the box body 801. The lower end of the connecting pipe 802 is located inside the cylinder body 2, and the other end of the connecting pipe 802 is located below the upper surface of the liquid 803. Salt-free sauerkraut is placed inside the cylinder body 2 to ferment and produce gas. The liquid 803 chooses not to react with the produced gas. When the gas enters the box body 801 through the connecting pipe 802, the gas is passed into the liquid 803, and then bubbles are generated and flow out through the air outlet pipe 804. Since one end of the connecting pipe 802 located inside the liquid 803 opens downward, the liquid 803 will not flow into the cylinder body 2 through the connecting pipe 802. The box body 801 is equipped with a valve for replacing the liquid 803. When replacing, the liquid can be injected into the box body 801 through the air outlet pipe 804.

[0061] The rotary lifting structure 9 is located at one side of the cylinder body 2 and is installed at the upper end of the bottom plate 1. The rotary lifting structure 9 is used for opening and closing the sealing cover 4. The rotary lifting structure 9 includes a shell 901. A slidable lifting rod 902 is installed inside the shell 901. A guide plate 907 is installed near the lower end of the shell 901. The lifting rod 902 slides up and down inside the guide plate 907. The upper end of the lifting rod 902 passes through the shell 901. A connecting plate 903 is installed at the upper end of the lifting rod 902. The connecting plate 903 is fixedly connected to the sealing cover 4. The lifting rod 902 moves up and down to drive the sealing cover 4 to move up and down. When the sealing cover 4 seals the cylinder body 2, the spring telescopic rod 403 is compressed, and the elastic force of the spring telescopic rod 403 reacts on the sealing ring 402 to achieve the sealing of the cylinder body 2. After the pickling and fermentation are completed, the lifting rod 902 moves upward to open the sealing cover 4 without manual operation.

[0062] Specifically, a plurality of groups of annular teeth 904 are installed on the surface of the lifting rod 902, and the annular teeth 904 are evenly spaced longitudinally. A motor 905 is fixedly installed on the inner wall of the shell 901, and a gear 906 is installed on the output end of the motor 905. The motor 905 can drive the gear 906 to rotate, and the teeth of the gear 906 are meshed and connected with the annular teeth 904. When the motor 905 rotates, the lifting rod 902 can be driven to move up and down through the annular teeth 904.

[0063] Motor 2 908 is fixedly installed at the bottom end of the shell 901, and a rotating shaft 909 is installed at the output end of the upper end of motor 2 908. Motor 2 908 can drive the rotating shaft 909 to rotate. Limiting ribs 910 are installed at both ends of the outer surface of the rotating shaft 909. The lifting rod 902 is sleeved on the rotating shaft 909. A groove matching the limiting rib is installed inside the lifting rod 902. When the rotating shaft 909 rotates, the lifting rod 902 can be driven to rotate through the limiting rib 910. In the process of rotation of the lifting rod 902, the annular teeth 904 rotate along with it, and the rotation of the annular teeth 904 will not interfere with the meshing gear 906.

[0064] The rotation of the lifting rod 902 can drive the sealing cover 4 to rotate, so that the sealing cover 4 is not above the cylinder body 2, which is convenient for people to put in and take out the sauerkraut. A net bucket 7 is placed inside the cylinder body 2. When the sauerkraut needs to be taken out, the net bucket only needs to be lifted out of the cylinder body 2, and the fermentation water can be filtered and retained inside the cylinder body 2. A connecting block 405 is installed on the inner side of the lower end of the sealing cover 4, and a cross bar for hanging objects is installed at the lower end of the connecting block 405. One end of the hook can be hung on the cross bar of the connecting block 405, and the other end of the hook can be used to hang the net bucket 7. The rising rotation of the lifting rod 902 drives the sealing cover 4 to rise and rotate, thereby taking out the net bucket 7, and the sauerkraut can be conveniently taken out.

[0065] A drain cylinder 10 is installed at the lower end of the cylinder body 2 to drain the fermentation water. The fermentation water can be replaced or reused according to actual conditions. If the fermentation water is replaced, clean water can be poured into the cylinder body 2 to rinse the inside of the cylinder body 2.

[0066] Embodiment 2

[0067] Described on the basis of Example 1, a sliding baffle 1001 is installed on the upper end of the liquid discharge cylinder 10, and an electric push rod 10011 is installed at one end of the sliding baffle 1001. The sliding baffle 1001 and the electric push rod 10011 are located inside the bottom wall of the cylinder body 2. The electric push rod 1001 controls the opening and closing of the sliding baffle 1001, and can be opened or closed between the cylinder body 2 and the liquid discharge cylinder 10.

[0068] A filter disc 1002 is installed inside the drain cylinder 10. When the fermented water flows to the filter disc 1002, the sauerkraut residue remains above the filter disc 1002. A drain pipe 1010 is installed at the lower end of the drain cylinder 10, and the fermented water flows out through the drain pipe 1010. A baffle plate 1003 is installed at the upper end of the filter disc 1002. A slot is provided at one end of the baffle plate 1003. A rotating rod 1005 is rotatably installed at the slot of the baffle plate 1003. A scraper 1006 is installed on the surface of the rotating rod 1005. A motor 3 1004 is installed at the upper end of the rotating rod 1005. The motor 3 1004 is installed on the baffle plate 1003 through a bracket. A waterproof cover is installed at the outer end of the motor 3 1004 for protection. When the motor 3 1004 is started, the scraper 1006 is driven to rotate through the rotating rod 1005, so that the salt-free sauerkraut remaining on the filter disc 1002 can be driven to move, thereby avoiding clogging of the filter disc 1002.

[0069] A fan-shaped opening is provided at one end of the filter disc 1002, and a baffle plate 1007 is installed at the lower end of the filter disc 1002. There are two baffle plates 1007, and the two baffle plates 1007 are located at the lower end of the opening of the filter disc 1002. A receiving plate 1008 is installed below the baffle plate 1003, and the receiving plate 1008 is located between the two baffle plates 1007. The scraper 1006 scrapes the residue of the salt-free pickled cabbage onto the receiving plate 1008. The baffle plate 1003, the scraper 1006, and the baffle plate 1007 are all provided with through holes to avoid blocking the formation of The flow of fermented water, of course, a small part of the fermented water will flow directly between the two baffles 1007, and the fermented water will flow out through the through holes of the baffle 1007, and the residue of salt-free sauerkraut will remain on the receiving plate 1008. A sliding door 1009 is installed on one side of the outer end of the drain cylinder 10, and a sliding groove for the sliding door 1009 is installed inside the side wall of the drain cylinder 10. A handle is installed at one end of the sliding door 1009, and the handle can be pulled upward to move the sliding door 1009 upward, so that the salt-free sauerkraut residue on the receiving plate 1008 can be cleaned.

[0070] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A constant temperature fermentation tank for pickling sauerkraut without salt, characterized in that: include: A bottom plate (1), wherein a cylinder body (2) is provided at the upper end of the bottom plate (1), a hollow groove (201) is provided inside the side wall of the cylinder body (2), a temperature adjustment structure (3) is provided on one side of the cylinder body (2), the temperature adjustment structure (3) comprises a water tank (301) with a semiconductor cooling fin, a water pump (302) is provided at the upper end of the water tank (301) with a semiconductor cooling fin, a water pipe (303) is provided at the upper end of the water pump (302), the other end of the water pipe (303) is connected to the water tank (301) with a semiconductor cooling fin, and the water pipe (303) is spirally coiled inside the hollow groove (201); A sealing cover (4), wherein a slot (401) is provided at the lower end of the sealing cover (4), the upper edge of the cylinder body (2) is plugged into the slot (401), a sealing ring (402) is provided inside the slot (401), a spring telescopic rod (403) is provided between the sealing ring (402) and the sealing cover (4), and a rotatable threaded sleeve (404) is provided at the center of the sealing cover (4); A cam indexer (5), the cam indexer (5) being located at the center of the upper end of the sealing cover (4), and the output end of the cam indexer (5) being fixedly connected to the threaded sleeve (404); An extrusion structure (6), the extrusion structure (6) comprising a threaded rod (601), the upper end of the threaded rod (601) being threadedly connected to a threaded sleeve (404), the lower end of the threaded rod (601) being provided with a connecting plate (602), the lower end of the connecting plate (602) being provided with an electric telescopic rod (603), the lower end of the electric telescopic rod (603) being provided with a sleeve (604), the interior of the sleeve (604) being provided with a spring, the lower end of the sleeve (604) being provided with an extrusion plate (605), the surface of the extrusion plate (605) being provided with a through hole (606); A net barrel (7), wherein the net barrel (7) is located inside the cylinder body (2); An air outlet structure (8), the air outlet structure (8) comprising a box body (801), a liquid (803) being arranged inside the box body (801), the box body (801) being fixedly connected to the upper end of the sealing cover (4), a connecting pipe (802) being arranged at the lower end of the box body (801), an air outlet pipe (804) being arranged at the upper end of the box body (801), the lower end of the connecting pipe (802) being located inside the cylinder body (2), and the other end of the connecting pipe (802) being located below the upper surface of the liquid (803); A rotary lifting structure (9), the rotary lifting structure (9) is located on one side of the cylinder body (2), the rotary lifting structure (9) comprises a shell (901), a motor 1 (905), a guide plate (907), and a motor 2 (908), a slidable lifting rod (902) is provided inside the shell (901), a connecting plate (903) is provided at the upper end of the lifting rod (902), the connecting plate (903) is fixedly connected to the sealing cover (4), a plurality of groups of annular teeth (904) are provided on the surface of the lifting rod (902), the motor 1 (905) is fixedly connected to the inner wall of the shell (901), and the motor 1 (905) is fixedly connected to the inner wall of the shell (901). ) an output end is provided with a gear (906), the gear (906) tooth portion is meshedly connected to the annular gear (904), the guide plate (907) is fixedly connected to the inside of the housing (901), the lower end of the lifting rod (902) is plugged into the guide plate (907), the motor 2 (908) is fixedly connected to the bottom end of the housing (901), the upper output end of the motor 2 (908) is provided with a rotating shaft (909), the outer surface of the rotating shaft (909) is provided with limiting convex ribs (910) at both ends, the lifting rod (902) is sleeved with the rotating shaft (909), and the lifting rod (902) is provided with a groove matching the limiting convex rib; A liquid discharge cylinder (10), wherein the liquid discharge cylinder (10) is fixedly connected to the lower end of the cylinder body (2).

2. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: The upper end of the liquid discharge cylinder (10) is provided with a sliding baffle (1001), a filter disc (1002) is provided inside the liquid discharge cylinder (10), a baffle plate 1 (1003) is provided at the upper end of the filter disc (1002), a rotating rod (1005) is rotatably provided inside one side of the baffle plate 1 (1003), a motor 3 (1004) is provided at the upper end of the rotating rod (1005), a scraper (1006) is sleeved on the surface of the rotating rod (1005), a baffle plate 2 (1007) is provided at the lower end of the filter disc (1002), a receiving plate (1008) is provided below the baffle plate 1 (1003), a liquid discharge pipe (1010) is provided at the lower end of the liquid discharge cylinder (10), and a sliding door (1009) is provided at one side of the outer end of the liquid discharge cylinder (10).

3. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: There are three groups of electric telescopic rods (603), and the three groups of electric telescopic rods (603) are irregularly installed at the lower end of the connecting plate (602). The three extrusion plates (605) have different sizes, and the through holes (606) opened in each extrusion plate (605) have different sizes.

4. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: The baffle plate 1 (1003), the scraper plate (1006), and the baffle plate 2 (1007) are all provided with through-hole arcs; one end of the baffle plate 1 (1003) is provided with a slot; one end of the motor 3 (1004) is provided with a bracket connected to the baffle plate 1 (1003); one end of the filter plate (1002) is provided with a fan-shaped opening; there are two baffle plates 2 (1007); the two baffle plates 2 (1007) are located at the lower end of the opening of the filter plate (1002); the receiving plate (1008) is located between the two baffle plates 2 (1007); a sliding groove for sliding a sliding door (1009) is provided inside the side wall of the liquid discharge cylinder (10); and a handle is provided at one end of the sliding door (1009).

5. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: The cam indexer (5) comprises a motor four (504) and a rotating disk (501); a cam pair (503) is provided at the output end of the motor four (504); a threaded sleeve (404) is fixedly connected to the center of the lower end of the rotating disk (501); and a cam roller (502) used in conjunction with the cam pair (503) is provided on the circumferential surface of the rotating disk (501).

6. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: A connecting block (405) is provided on the inner side of the lower end of the sealing cover (4), and a cross bar for hanging articles is provided on the lower end of the connecting block (405).

7. The constant temperature fermentation tank for pickling sauerkraut without salt according to claim 1, characterized in that: An electric push rod (10011) is provided at one end of the sliding baffle (1001), and the sliding baffle (1001) and the electric push rod (10011) are located inside the bottom wall of the cylinder body (2).

8. The fermentation method of a constant temperature fermentation tank for pickling salt-free sauerkraut according to claim 1, characterized in that: The following steps are involved: Step 1: Prepare the raw materials for salt-free sauerkraut, including vegetables and fermentation water; Step 2: Put the raw material into the cylinder body (2), move the sealing cover (4) to the top of the cylinder body (2) by rotating the lifting structure (9), and discharge the air inside the raw material by the cam indexer (5) and the extrusion structure (6); Step 3: The sealing cover (4) and the cylinder body (2) are sealed by rotating the lifting structure (9) to carry out fermentation. The temperature inside the cylinder body (2) is kept constant by the temperature regulating structure (3), and the gas generated during fermentation is discharged through the gas outlet structure; Step 4: After fermentation is completed, use the optional lifting structure (9) to open the sealing cover and cooperate with the net bucket (7) to take out the sauerkraut, and the fermented water remains in the cylinder (2); Step 5: If the fermentation water needs to be replaced, open the sliding baffle (1001), and the fermentation water is filtered and discharged through the drainage cylinder (10), leaving the remaining sauerkraut residue.

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