Method for producing watermelon juice by using ultrahigh pressure technology

Abstract

The invention discloses a method for producing watermelon juice by using an ultrahigh pressure technology, and relates to the field of food production. The invention relates to a method for producing watermelon juice by using an ultrahigh pressure technology. The method mainly comprises the following steps: step 1, preparing materials and equipment: selecting fresh watermelons, juicing equipment and a filter, and carrying out ultrahigh pressure sterilization treatment on HPP; step 2, washing the watermelons: washing the watermelons with clear water, and removing dirt and impurities on the surfaces of the watermelons; according to the watermelon juice squeezing device, watermelon juice is filtered, watermelon seeds and watermelon pulp residues remaining in the watermelon juice are removed, so that the quality of the watermelon juice is improved, the watermelon pulp residues are squeezed through the expansion air bag, juice remaining in watermelon pulp is extracted, the squeezing effect on the watermelon juice is improved, and the watermelon juice squeezing effect is improved. When watermelon pulp residues are pressed, the air bag has elasticity, so that watermelon seeds cannot be damaged by expanding the air bag, and the situation that the taste of watermelon juice is affected by damage of the watermelon seeds is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of food production, and in particular relates to a method for producing watermelon juice by utilizing ultrahigh pressure technology. Background Art

[0002] Antioxidants such as lycopene and vitamin C in watermelon juice help lower blood cholesterol levels and reduce the effects of atherosclerosis. Watermelon juice is a juice drink made from watermelon through physical methods such as pressing, centrifugation, and extraction.

[0003] At present, when producing watermelon juice, the watermelon needs to be rinsed with clean water, then peeled and cut into pieces, and then put into a juice extraction device to extract the juice. After the juice is extracted, it needs to be filtered through a filter or a filter to remove impurities. After the filtration is completed, it is filled, and then placed in an HPP ultra-high pressure sterilization device for sterilization. After the sterilization is completed, the filling bottle is labeled and coded, and the labeled and coded products are packed and stored in a cold storage.

[0004] However, currently when the cut watermelon pieces are put into a juice extractor for juicing, the watermelon seeds are easily broken, so that the components in the broken watermelon seeds will affect the taste of the watermelon juice after mixing with the watermelon juice. In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for producing watermelon juice using ultrahigh pressure technology, which can overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A method for producing watermelon juice by using ultrahigh pressure technology mainly comprises the following steps: step 1, preparing materials and equipment: selecting fresh watermelon, juice extraction equipment, filter, and HPP ultrahigh pressure sterilization treatment; step 2, washing watermelon: rinsing the watermelon with clean water to remove dirt and impurities on the surface; step 3, peeling and cutting: peeling the watermelon and cutting it into blocks of appropriate size for easy juice extraction; step 4, juice extraction: putting the cut watermelon blocks into the juice extraction equipment to extract the juice; step 5, filtering: filtering the squeezed watermelon juice through a filter or The filter is used to filter to remove the residue and watermelon seeds in the watermelon juice; Step 6, filling: the filtered watermelon juice is degassed and then filled; Step 7, HPP ultra-high pressure sterilization: the filled products are transferred to the ultra-high pressure sterilization workshop, and then the products are placed in the HPP ultra-high pressure container for sterilization. The sterilization conditions are 400-600MPa, 5-10min. After sterilization, labeling and coding are performed on the filled bottles; Step 8: Warehousing and refrigeration: the labeled and coded products are packed and stored in warehouses and refrigerated at 0-8℃.

[0008] The juice extraction device includes a squeezing tank and a rotating shaft rotatably connected to the squeezing tank, a crushing rod is fixedly connected to the rotating shaft, wherein the filtering device includes a filter box, the filter box is connected to the squeezing tank through a reflux pipe, and a filter plate is arranged in the filter box; a liquid pump is fixedly installed on the side wall of the filter box and is used to suck the watermelon juice in the squeezing tank and pump it into the filter box; a piston plate is lifted and connected to the filter box and is located above the filter plate; an expansion airbag is arranged on the piston plate.

[0009] In order to facilitate the addition of watermelon pulp into the squeezing tank, the top of the squeezing tank is further arranged to be open, the top of the squeezing tank is detachably connected with a cover plate by fixing bolts, and the inner wall of the lower end of the squeezing tank is arranged to be conical.

[0010] In order to drive the rotating shaft to rotate, further, the rotating shaft is rotatably connected to the cover plate, a motor is fixedly installed on the cover plate, a gear one is fixedly connected to the output end of the motor, a gear two is fixedly connected to the rotating shaft, and the gear two is meshingly connected to the gear one.

[0011] In order to facilitate the pumping of the squeezed watermelon juice into the filter box for filtration, further, a hollow cavity is opened at the axis center of the rotating shaft, and the input end of the liquid pump is fixedly connected to an infusion tube, and the end of the infusion tube away from the liquid pump is connected to the hollow cavity through a rotating joint, and the rotating joint is arranged on the rotating shaft, and the output end of the liquid pump is connected to the filter box.

[0012] In order to control the opening or closing of the reflux pipe, further, a plurality of branch pipes are equidistantly arranged around the circumference near the upper end of the squeezing tank, one end of the branch pipe is connected to the reflux pipe, and the other end passes through the squeezing tank, and a solenoid valve is arranged on the reflux pipe.

[0013] In order to drive the piston plate to move so that the piston plate can rise or fall in the filter box, further, a cylinder is fixedly mounted on the filter box, and the piston plate is fixedly connected to the output end of the cylinder.

[0014] In order to be able to clean the watermelon seeds and residues blocked on the filter plate, the filter box is further provided with a slag discharge port, a chute, and an air supply cavity. A T-shaped plate for closing the slag discharge port is slidably connected in the chute. An air nozzle is provided on the inner wall of the filter box, and the air nozzle is connected to the air supply cavity. The air nozzle corresponds to the slag discharge port. An air storage cavity is provided above the piston plate in the filter box. An air supply pipe 1 and an air supply pipe 2 connected to the air storage cavity are provided on the filter box, and the air supply pipe 2 is connected to the air supply cavity.

[0015] In order to be able to dredge the filter holes of the filter plate to keep the filter plate unobstructed, it further includes an air pipe three, one end of which is connected to the air pipe two, and the other end is connected to the filter box, the end of the air pipe two connected to the filter box is located below the filter plate, a spring is fixedly connected between the T-plate and the inner wall of the slide groove, the filter box is provided with a guide sleeve which is respectively connected to the slide groove and the air pipe three, a sliding disk is slidably connected in the air pipe three, a through hole is opened on the sliding disk, and a pull rope is provided in the guide sleeve, one end of the pull rope is fixedly connected to the T-plate, and the other end is fixedly connected to the sliding disk.

[0016] In order to facilitate the discharge of the watermelon juice from which the residues and watermelon seeds are removed from the squeezing tank, further, a juice discharge pipe is fixedly connected to the bottom of the squeezing tank, and a valve switch is arranged on the juice discharge pipe.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention filters the watermelon juice to remove the watermelon seeds and watermelon pulp residues remaining in the watermelon juice, thereby improving the quality of the watermelon juice. When filtering the watermelon juice, the watermelon juice is circulated in the extraction tank to promote uniform distribution of various components in the watermelon juice, thereby ensuring the taste of the watermelon juice. The watermelon pulp residue is squeezed to extract the juice remaining in the watermelon pulp residue, thereby improving the squeezing effect of the watermelon juice. When the watermelon pulp residue is pressed by the inflatable airbag, the inflatable airbag has elasticity and therefore will not damage the watermelon seeds, thereby preventing the damage of the watermelon seeds from affecting the taste of the watermelon juice. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the extraction tank and the filter box of the present invention;

[0020] Figure 2 The structure of the present invention is schematically shown in FIG. Figure 1 ;

[0021] Figure 3 The structure of the present invention is schematically shown in FIG. Figure 2 ;

[0022] Figure 4 It is a cross-sectional view of the extraction tank, the cover plate, the filter box and the filter plate of the present invention.

[0023] Figure 5 is a cross-sectional view of the squeezing tank of the present invention;

[0024] Figure 6 It is a cross-sectional view of the filter box and the gas transmission pipe 3 of the present invention;

[0025] Figure 7 The present invention Figure 1 A magnified view of part A;

[0026] Figure 8 The present invention Figure 1 A magnified view of part B;

[0027] Fig. 9 The present invention Figure 4 Enlarged view of part C;

[0028] Fig.10 The present invention Figure 6 Enlarged view of part D.

[0029] In the figure: 1. extraction tank; 101. cover plate; 102. fixing bolt; 103. juice discharge pipe; 2. rotating shaft; 201. breaking rod; 202. motor; 203. gear one; 204. gear two; 3. filter box; 301. filter plate; 302. return pipe; 303. branch pipe; 4. liquid pump; 401. liquid delivery pipe; 402. rotary joint; 403. hollow cavity; 5. cylinder; 501. piston plate; 502. expansion airbag; 6. slag discharge port; 601. T-plate; 602. slideway; 603. spring; 604. gas delivery pipe one; 605. gas delivery pipe two; 606. gas delivery cavity; 607. air nozzle; 608. gas delivery pipe three; 609. sliding plate; 610. pull rope; 611. guide sleeve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] Embodiment 1:

[0032] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 A method for producing watermelon juice using ultra-high pressure technology, the juice extraction equipment includes a squeezing tank 1 and a rotating shaft 2 rotatably connected to the squeezing tank 1, a crushing rod 201 is fixedly connected to the rotating shaft 2, wherein the filtering equipment includes a filter box 3, the filter box 3 is connected to the squeezing tank 1 through a reflux pipe 302, and a filter plate 301 is arranged in the filter box 3; a liquid pump 4 is fixedly installed on the side wall of the filter box 3 and is used to suck the watermelon juice in the squeezing tank 1 and pump it into the filter box 3; a piston plate 501 is lifted and connected in the filter box 3 and is located above the filter plate 301; an expansion airbag 502 is arranged on the piston plate 501.

[0033] The rotating shaft 2 is rotatably connected to the cover plate 101 , a motor 202 is fixedly mounted on the cover plate 101 , a gear 1 203 is fixedly connected to the output end of the motor 202 , a gear 2 204 is fixedly connected to the rotating shaft 2 , and the gear 2 204 is meshedly connected to the gear 1 203 .

[0034] The top of the squeezing tank 1 is open, and a cover plate 101 is detachably connected to the top of the squeezing tank 1 via fixing bolts 102. The inner wall of the lower end of the squeezing tank 1 is conical.

[0035] A hollow cavity 403 is opened at the axis center of the rotating shaft 2, and the input end of the liquid pump 4 is fixedly connected to an infusion tube 401. The end of the infusion tube 401 away from the liquid pump 4 is connected to the hollow cavity 403 through a rotating joint 402. The rotating joint 402 is set on the rotating shaft 2, and the output end of the liquid pump 4 is connected to the filter box 3.

[0036] A plurality of branch pipes 303 are equidistantly arranged around the upper end of the squeezing tank 1 . One end of the branch pipe 303 is connected to the return pipe 302 , and the other end runs through the squeezing tank 1 . The return pipe 302 is provided with a solenoid valve.

[0037] When in use, firstly, the washed watermelon is peeled, and then cut into blocks of appropriate size, and then the cut watermelon blocks are placed in the squeezing tank 1 to squeeze the juice, and after the watermelon blocks are placed, the operator can cover the squeezing tank 1 with the cover plate 101 to seal the squeezing tank 1, so as to avoid the watermelon juice splashing out of the squeezing tank 1 and causing waste during the juicing process, and then the fixing bolts 102 for limiting and fixing the cover plate 101 are screwed on, so as to improve the stability of the cover plate 101 covering the squeezing tank 1;

[0038] When the juice is squeezed, the motor 202 is started, and the motor 202 drives the rotating shaft 2 to rotate through the meshing connection of the gear 1 203 and the gear 2 204, and the rotating shaft 2 drives the crushing rod 201 to rotate, so that the crushing rod 201 can crush the watermelon pulp when rotating, and then squeeze out the juice in the watermelon pulp. In the specific implementation, in order to prevent the rotating crushing rod 201 from damaging the watermelon seeds, the crushing rod 201 can use an elastic silicone rod, and the rotating crushing rod 201 can also stir and mix the squeezed juice, so as to ensure that the various components in the watermelon juice are evenly distributed, thereby ensuring the taste of the watermelon juice;

[0039] After the watermelon pulp is crushed, the watermelon pulp residue that is not fully crushed will be mixed in the juice, and the watermelon seeds will naturally sink in the watermelon juice because the density is greater than that of the watermelon juice, and then sink to the bottom of the extraction tank 1, and then the liquid pump 4 is started. When the liquid pump 4 extracts the watermelon juice in the extraction tank 1, it is transported into the filter box 3 through the hollow cavity 403 and the infusion tube 401. At the same time, the watermelon seeds precipitated at the bottom of the extraction tank 1 and the watermelon pulp residue mixed in the watermelon juice are transported into the filter box 3 together with the watermelon juice, and the infusion tube 401 is used to filter the watermelon juice. A one-way valve is arranged on 01, and at this time, the watermelon juice flows to the bottom of the filter box 3 through the filter holes of the filter plate 301, while the watermelon seeds and watermelon pulp residues transported into the filter box 3 along with the watermelon juice are blocked on the filter plate 301, thereby filtering the watermelon juice, and then removing the watermelon seeds and watermelon pulp residues remaining in the watermelon juice, thereby improving the quality of the watermelon juice, and then the filtered watermelon juice flows back into the extraction tank 1 through the reflux pipe 302 and the branch pipe 303 to form a circulation, which promotes the uniform distribution of various components in the watermelon juice, and further ensures the taste of the watermelon juice;

[0040] When the watermelon juice in the squeezing tank 1 is filtered, the inner wall of the lower end of the squeezing tank 1 is tapered (such as Figure 1 , Figure 4As shown), the watermelon seeds that sink to the bottom of the squeezing tank 1 can gather toward the axis of the squeezing tank 1, which is beneficial for the watermelon seeds to be drawn into the filter box 3 along with the watermelon juice for filtration and separation. At the same time, the watermelon juice generates a rotating flow under the stirring of the breaking rod 201, thereby forming a vortex, so that the vortex can make the watermelon seeds that sink to the bottom of the squeezing tank 1 gather toward the axis of the squeezing tank 1, which is beneficial for the watermelon seeds to be drawn into the filter box 3 along with the watermelon juice for filtration and separation.

[0041] It should be noted that by setting the cover plate 101 to be detachable, it is convenient for the operator to clean the inside of the squeezing tank 1 after squeezing the watermelon juice.

[0042] It should be additionally explained that the infusion tube 401 is a stretchable and shrinkable hose, so the infusion tube 401 will not interfere with the disassembly and assembly of the cover plate 101.

[0043] Embodiment 2:

[0044] Reference Figure 1 , Figure 2 , Figure 4 A method for producing watermelon juice using ultrahigh pressure technology is basically the same as Example 1. Furthermore, a cylinder 5 is fixedly installed on the filter box 3, and a piston plate 501 is fixedly connected to the output end of the cylinder 5.

[0045] In the process of crushing the watermelon pulp and squeezing the juice, when a proper amount of watermelon pulp residue is blocked on the filter plate 301, the cylinder 5 is started, and the cylinder 5 drives the piston plate 501 to move up and down in the filter box 3, and the piston plate 501 drives the expansion airbag 502 to move synchronously. When the piston plate 501 drives the expansion airbag 502 to move downward in the filter box 3, the expansion airbag 502 can be squeezed to extract the juice remaining in the watermelon pulp residue, and then the extracted juice passes through the filter plate 301 and flows into the bottom of the filter box 3, and then is discharged back to the squeezing tank 1 through the reflux pipe 302 and the branch pipe 303, so as to improve the squeezing effect of the watermelon juice;

[0046] When the watermelon pulp residue is compressed by the inflatable airbag 502, since the airbag is elastic, the inflatable airbag 502 will not damage the watermelon seeds blocked on the filter plate 301, thereby preventing the damaged watermelon seeds from affecting the taste of the watermelon juice.

[0047] Embodiment 3:

[0048] Reference Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 8 , Fig. 9 , Fig.10A method for producing watermelon juice using ultrahigh pressure technology is basically the same as that of Example 1. Furthermore, a slag discharge port 6, a chute 602, and an air supply cavity 606 are provided on the filter box 3. A T-shaped plate 601 for closing the slag discharge port 6 is slidably connected in the chute 602. An air nozzle 607 is provided on the inner wall of the filter box 3. The air nozzle 607 is connected to the air supply cavity 606. The air nozzle 607 corresponds to the slag discharge port 6. An air storage cavity is provided above the piston plate 501 in the filter box 3. An air supply pipe 1 604 and an air supply pipe 2 605 connected to the air storage cavity are provided on the filter box 3. The air supply pipe 2 605 is connected to the air supply cavity 606.

[0049] It also includes an air supply pipe three 608, one end of which is connected to the air supply pipe two 605, and the other end is connected to the filter box 3. The end of the air supply pipe two 605 connected to the filter box 3 is located below the filter plate 301, and a spring 603 is fixedly connected between the T-plate 601 and the inner wall of the slide groove 602. The filter box 3 is provided with a guide sleeve 611 which is respectively connected to the slide groove 602 and the air supply pipe three 608. A sliding disk 609 is slidably connected in the air supply pipe three 608, and a through hole is opened on the sliding disk 609. A pull rope 610 is provided in the guide sleeve 611, and one end of the pull rope 610 is fixedly connected to the T-plate 601, and the other end is fixedly connected to the sliding disk 609.

[0050] When the cylinder 5 drives the piston plate 501 to move downward in the filter box 3, external gas can be sucked into the gas storage cavity through the gas pipe 1 604, and then when the cylinder 5 drives the piston plate 501 to move upward in the filter box 3, the gas can be discharged from the gas storage cavity through the gas pipe 2 605 under the pressure of the piston plate 501. One-way valves are provided on the gas pipe 1 604 and the gas pipe 2 605. Then the gas is transported into the gas cavity 606 through the gas pipe 2 605, and finally ejected through the air nozzle 607, so that the watermelon seeds blocked on the filter plate 301 and the squeezed and shrunken residue can be blown to the slag discharge port 6. When the slag discharge port 6 is opened, the watermelon seeds and the squeezed and shrunken residue can be discharged from the filter box 3 through the slag discharge port 6.

[0051] In the specific implementation, in order to ensure that the gas ejected by the air nozzle 607 can blow the watermelon seeds and the squeezed and shriveled residues to the residue discharge port 6, an external booster pump can be connected to the gas pipe 2 605;

[0052] At the same time, when the gas passes through the gas delivery pipe 2 605, part of the gas can also be filled into the filter box 3 located below the filter plate 301 through the gas delivery pipe 3 608 (such as Figure 4As shown), it can reversely clean the filter holes of the filter plate 301, so as to achieve the purpose of dredging the filter holes of the filter plate 301. A one-way valve is arranged on the gas transmission pipe 3 608. At the same time, when the filter holes of the filter plate 301 are dredged, the gas will be discharged through the filter holes of the filter plate 301, so that it can reduce the adhesion of the watermelon seeds and the squeezed and shriveled residues on the surface of the filter plate 301, which is conducive to the gas ejected by the air nozzle 607 to blow the watermelon seeds and the squeezed and shriveled residues to the residue discharge port 6, thereby improving the cleaning effect of the watermelon seeds and the squeezed and shriveled residues;

[0053] At the same time, when the gas passes through the gas pipe 3 608, it can push the sliding plate 609 to slide downward in the gas pipe 3 608. At the same time, when the sliding plate 609 moves downward, it can also pull the T-shaped plate 601 to move downward in the slide groove 602 through the pull rope 610 (such as Figure 6 As shown), and compress the spring 603 to open the slag discharge port 6, at which time the watermelon seeds and the squeezed shriveled residue can be discharged from the filter box 3 through the slag discharge port 6;

[0054] When the gas in the gas storage chamber is completely discharged and no gas passes through the gas pipe three 608, the compressed spring 603 will automatically reset under its own elastic potential energy, thereby pushing the T-shaped plate 601 to slide upward in the slide groove 602 to close the slag discharge port 6. At the same time, when the T-shaped plate 601 slides upward, it can also pull the sliding plate 609 to slide upward in the gas pipe three 608 through the pull rope 610 to reset.

[0055] Embodiment 4:

[0056] Reference Figure 1 , Figure 4 A method for producing watermelon juice using ultrahigh pressure technology is basically the same as that of Example 1, and further, a juice discharge pipe 103 is fixedly connected to the bottom of the squeezing tank 1, and a valve switch is provided on the juice discharge pipe 103; after the watermelon juice with the residue and watermelon seeds removed is evenly mixed in the squeezing tank 1, the watermelon juice can be discharged from the squeezing tank 1 through the juice discharge pipe 103 by opening the valve switch on the juice discharge pipe 103, and then the watermelon juice discharged from the squeezing tank 1 can be filled.

[0057] Embodiment 5:

[0058] A method for producing watermelon juice using ultrahigh pressure technology mainly comprises the following steps:

[0059] Step 1. Prepare materials and equipment: select fresh watermelon, juice extraction equipment, filter, HPP ultra-high pressure sterilization treatment;

[0060] Step 2: Wash the watermelon: Rinse the watermelon with clean water to remove dirt and impurities on the surface;

[0061] Step 3: Peel and cut into pieces: Peel the watermelon and cut into pieces of appropriate size to facilitate juicing;

[0062] Step 4: Juicing: Put the cut watermelon pieces into the juicing equipment to squeeze the juice;

[0063] Step 5, filtering: filtering the squeezed watermelon juice through a strainer or filter to remove the residue and watermelon seeds in the watermelon juice;

[0064] Step 6: Filling: Degas the filtered watermelon juice and then fill it;

[0065] Step 7: HPP ultra-high pressure sterilization treatment: transfer the filled products to the ultra-high pressure sterilization workshop, and then put the products into the HPP ultra-high pressure container for sterilization. The sterilization conditions are 400-600MPa for 5-10min. After the sterilization is completed, label and code the filled bottles.

[0066] Step 8: Refrigerated storage: After labeling and coding, the products are packed and stored in warehouses and refrigerated at 0-8℃.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention.

Claims

1. A method for producing watermelon juice using ultrahigh pressure technology, characterized in that: The main steps include: Step 1. Prepare materials and equipment: select fresh watermelon, juice extraction equipment, filter, HPP ultra-high pressure sterilization treatment; Step 2: Wash the watermelon: Rinse the watermelon with clean water to remove dirt and impurities on the surface; Step 3: Peel and cut into pieces: Peel the watermelon and cut into pieces of appropriate size to facilitate juicing; Step 4: Juicing: Put the cut watermelon pieces into the juicing equipment to squeeze the juice; Step 5, filtering: filtering the squeezed watermelon juice through a strainer or filter to remove the residue and watermelon seeds in the watermelon juice; Step 6: Filling: Degas the filtered watermelon juice and then fill it; Step 7: HPP ultra-high pressure sterilization treatment: transfer the filled products to the ultra-high pressure sterilization workshop, and then put the products into the HPP ultra-high pressure container for sterilization. The sterilization conditions are 400-600MPa for 5-10min. After the sterilization is completed, label and code the filled bottles. Step 8: Refrigerated storage: After labeling and coding, the products are packed and stored in warehouses and refrigerated at 0-8℃.

2. The method for producing watermelon juice using ultrahigh pressure technology according to claim 1, characterized in that: The juice extraction device comprises a juice extraction tank (1) and a rotating shaft (2) rotatably connected to the juice extraction tank (1), wherein a crushing rod (201) is fixedly connected to the rotating shaft (2). The filtering device comprises a filtering box (3), the filtering box (3) is connected to the squeezing tank (1) via a return pipe (302), and a filtering plate (301) is arranged in the filtering box (3); A liquid pump (4) is fixedly mounted on the side wall of the filter box (3) and is used to suck the watermelon juice in the extraction tank (1) and pump it into the filter box (3); A piston plate (501) is connected in a lifting manner in the filter box (3) and is located above the filter plate (301); The expansion airbag (502) is arranged on the piston plate (501).

3. The method for producing watermelon juice using ultrahigh pressure technology according to claim 2, characterized in that: The top of the squeezing tank (1) is open, the top of the squeezing tank (1) is detachably connected to a cover plate (101) via fixing bolts (102), and the inner wall of the lower end of the squeezing tank (1) is conical.

4. The method for producing watermelon juice using ultrahigh pressure technology according to claim 3, characterized in that: The rotating shaft (2) is rotatably connected to the cover plate (101), a motor (202) is fixedly mounted on the cover plate (101), an output end of the motor (202) is fixedly connected to a gear 1 (203), a gear 2 (204) is fixedly connected to the rotating shaft (2), and the gear 2 (204) is meshingly connected to the gear 1 (203).

5. The method for producing watermelon juice using ultrahigh pressure technology according to claim 2, characterized in that: A hollow cavity (403) is formed at the axis of the rotating shaft (2); the input end of the liquid pump (4) is fixedly connected to a liquid infusion tube (401); the end of the liquid infusion tube (401) away from the liquid pump (4) is connected to the hollow cavity (403) via a rotating joint (402); the rotating joint (402) is arranged on the rotating shaft (2); and the output end of the liquid pump (4) is connected to the filter box (3).

6. The method for producing watermelon juice using ultrahigh pressure technology according to claim 5, characterized in that: A plurality of branch pipes (303) are equidistantly arranged around the circumference of the extraction tank (1) near the upper end thereof. One end of the branch pipe (303) is connected to the return pipe (302), and the other end thereof passes through the extraction tank (1). A solenoid valve is arranged on the return pipe (302).

7. The method for producing watermelon juice using ultrahigh pressure technology according to claim 2, characterized in that: The filter box (3) is fixedly mounted with a cylinder (5), and the piston plate (501) is fixedly connected to the output end of the cylinder (5).

8. The method for producing watermelon juice using ultrahigh pressure technology according to claim 7, characterized in that: The filter box (3) is provided with a slag discharge port (6), a chute (602), and an air delivery cavity (606); a T-shaped plate (601) for closing the slag discharge port (6) is slidably connected in the chute (602); an air nozzle (607) is provided on the inner wall of the filter box (3); the air nozzle (607) is connected to the air delivery cavity (606); the air nozzle (607) corresponds to the slag discharge port (6); an air storage cavity is provided above the piston plate (501) in the filter box (3); an air delivery pipe 1 (604) and an air delivery pipe 2 (605) connected to the air storage cavity are provided on the filter box (3); the air delivery pipe 2 (605) is connected to the air delivery cavity (606).

9. The method for producing watermelon juice using ultrahigh pressure technology according to claim 8, characterized in that: The invention also comprises an air supply pipe (608), one end of which is connected to the air supply pipe (605), and the other end of which is connected to the filter box (3). The end of the air supply pipe (605) connected to the filter box (3) is located below the filter plate (301). A spring (603) is fixedly connected between the T-shaped plate (601) and the inner wall of the slide groove (602). The filter box (3) is provided with a guide sleeve (611) which is respectively connected to the slide groove (602) and the air supply pipe (608). A sliding plate (609) is slidably connected inside the air supply pipe (608). A through hole is provided on the sliding plate (609). A pull rope (610) is provided in the guide sleeve (611). One end of the pull rope (610) is fixedly connected to the T-shaped plate (601), and the other end is fixedly connected to the sliding plate (609).

10. The method for producing watermelon juice using ultrahigh pressure technology according to claim 2, characterized in that: The bottom of the squeezing tank (1) is fixedly connected to a juice drain pipe (103), and a valve switch is provided on the juice drain pipe (103).

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