Pretreatment device for canned grape production line

Abstract

A pretreatment device for a grape can production line comprises a brush device, the lower portion of the brush device is connected with a threshing device, the lower portion of the threshing device is connected with a branch removing device, and the lower portion of the branch removing device is connected with a peeling device; the peeling device comprises a peeling box body, a soaking solution added with alkali liquor for corrosion is arranged in the peeling box body, a feeding pipe is arranged on the upper portion of the peeling box body, the peeling device further comprises a rinsing device, the lower portion of the rinsing device is connected with a coring device, the lower portion of the coring device is connected with a conveying belt, and the conveying belt is connected with a conveying belt. One end of the conveying belt is connected with a hardening and soaking device, and a soaking solution added with a hardening agent and a color fixative is arranged in the hardening and soaking device; and the sterilization device is used for sterilizing the product. According to the method, the brush is used for washing, threshing and rotary loosening pulp, abrasion of branches to fruits is reduced, then the drum-type stemming machine is used, the fruit breaking rate is greatly reduced, and the hardening effect is improved by adopting the soaking solution of the hardening agent and the color fixative.

Description

Technical Field

[0001] The invention belongs to the technical field of canned grape production, and in particular relates to a pretreatment device for a canned grape production line. Background Art

[0002] The food processing industry has developed rapidly with the growing demand of consumers for healthy and convenient food. Among them, canned fruit, as a common ready-to-eat product, has also been continuously improving its production process. As a popular product type, the pretreatment process of canned grapes is particularly important because it is directly related to the quality and taste of the final product. Pretreatment usually includes multiple steps such as cleaning, debranching, threshing and hardening, each of which has an important impact on the quality of the final product. Traditional grape pretreatment methods mostly use manual operations or simple mechanical equipment. Although these methods are simple and easy to use, they have many shortcomings in practical applications. For example, in the process of debranching, the traditional debranching method is not only inefficient, but may also cause damage to the surface of the fruit, affecting the appearance; and the traditional drum-type stemming machine is easy to cause fruit damage when debranching soft grapes such as Kyoho grapes due to their high juice content. The fruit breakage rate of this method alone is as high as 30%, which seriously affects the qualified rate and final taste of the product.

[0003] In addition, hardening treatment is also a key link in the production of canned grapes. Hardening treatment is mainly to improve the texture of grapes. In the pretreatment stage, especially in hardening treatment, traditional canned grape production lines mostly use intermittent immersion hardening or no immersion hardening treatment at all, and only rely on the selection of raw materials with lower maturity to maintain a certain hardness. The former is inefficient and it is difficult to ensure that each batch of grapes can obtain a consistent hardening effect; the latter is limited by the selection of raw materials. Although grapes with lower maturity can maintain good hardness in the short term, their flavor and taste are relatively poor, and are not conducive to long-term storage. The canning sterilization conditions of the existing technology are 84-88℃, 15-20min, which easily leads to the deterioration of ordinary flavor and taste, and is not conducive to the hardening effect. Therefore, we propose a pretreatment device for canned grape production line. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a pretreatment device for a canned grape production line, which first uses a brush to wash and thresh the fruit, and then uses a rotary loose pulp to reduce the wear of the branches on the fruit. Then, a drum-type destemmer is used to greatly reduce the fruit breakage rate. The use of a soaking liquid containing a hardener and a color preservative improves the hardening effect.

[0005] The present invention is achieved in this way. A pretreatment device for a canned grape production line includes a brush device, a threshing device is connected to the lower part of the brush device, a debranching device is connected to the lower part of the threshing device, and a peeling device is connected to the lower part of the debranching device; the brush device includes an inverted trapezoidal box body, a first brush roller is rotatably connected to the upper side of the interior of the inverted trapezoidal box body, and a second brush roller is rotatably connected to the lower side of the interior of the inverted trapezoidal box body, the first brush roller and the second brush roller can drive the grapes to move in the inverted trapezoidal box body and rotate to loosen the pulp; the threshing device includes a first box body, a smooth roller and a threshing roller are rotatably connected to the interior of the first box body, and when the grapes pass through the gap between the smooth roller and the threshing roller, It can play a threshing role; the debranching device includes a first connecting box body, the right side of the first connecting box body is connected to the second box body, the interior of the second box body is provided with an annular separation net, and the interior of the annular separation net is provided with a debranching roller; the peeling device includes a peeling box body, the interior of the peeling box body is provided with a soaking liquid with added alkali corrosion, the upper part of the peeling box body is provided with a feeding pipe, and also includes a rinsing device, the lower part of the rinsing device is connected to a core removal device, the lower part of the core removal device is connected to a conveyor belt, one end of the conveyor belt is connected to a hardening soaking device, the interior of the hardening soaking device is provided with a soaking solution with added hardener and color preservative; it also includes a sterilization device for product sterilization.

[0006] Optionally, the right side of the inverted trapezoidal box is rotatably connected with a flap, and a spray device is installed on the flap. The spray device includes an oblique spray head and a longitudinal spray head, and the oblique spray head and the longitudinal spray head are connected through a first connecting pipe.

[0007] Optionally, the first connecting pipe is connected to a second connecting pipe for connecting multiple groups of oblique nozzles and longitudinal nozzles, the second connecting pipe is connected to a water distribution pipe, and both ends of the water distribution pipe are respectively connected to a water inlet pipe and an air inlet pipe.

[0008] Optionally, the upper portion of the inverted trapezoidal box body is connected with a flange, a magnet block is embedded on the flange, the flap is an iron cover plate, and the inverted trapezoidal box body is connected with a plurality of first motors.

[0009] Optionally, two second motors are connected to the first box body, and the second motors respectively drive the smooth roller and the threshing roller to rotate.

[0010] Optionally, the hardener is calcium ions, and the calcium ion concentration ranges from 0.03% to 0.2%. The color protecting agent is vitamin C, and the amount of vitamin C ranges from 0.03% to 0.15%.

[0011] Optionally, a leg is welded to the lower portion of the peeling box body, a discharge port is provided at the lower portion of the peeling box body, and a valve is connected to the discharge port.

[0012] Optionally, a third motor is connected to one side of the peeling box, and an output shaft of the third motor passes through the interior of the peeling box and is welded with a peeling roller.

[0013] Optionally, a second connecting box for connecting to a second box is welded to the upper portion of the peeling box, an inspection door is connected to the right side of the second box, and a fourth motor is connected to the inspection door.

[0014] Optionally, the output shaft of the fourth motor is drivingly connected to a debranching roller, a spiral conveying blade, a threshing blade and a separation rod are welded on the debranching roller, and a branch outlet is connected to the lower right side of the second box body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The first brush roller and the second brush roller in the brush device move in coordination with each other in the inverted trapezoidal box, so as to achieve the effect of rotary loosening of the grape pulp during the washing process. This step can not only effectively clean the stains on the surface of the grapes, but also reduce the wear of the branches on the fruits by rotating and loosening the pulp, thus protecting the integrity of the grapes and reducing the fruit breakage rate in the subsequent debranching and threshing process. Finally, the beneficial effects of reducing fruit damage and improving the yield rate are achieved.

[0017] 2. After brush washing and threshing, the grapes enter the threshing device and pass through the gap between the smooth roller and the threshing roller to achieve threshing. By setting up an annular separation net and a debranching roller, the grape branches are effectively separated. When the grapes pass through the annular separation net, their branches will be guided to the central area of ​​the separation net, and at this time, the spiral conveying blades, threshing blades and separation rods on the debranching roller will work together to further peel off the branches and transport them to the branch outlet. This design not only improves the efficiency of debranching, but also, due to the design of spiral conveying blades and threshing blades, the branches can be effectively separated from the fruit without damaging the fruit. In addition, the debranching roller is driven to rotate by the fourth motor, which ensures the continuity and stability of the debranching process and avoids the inconsistency and inefficiency that may occur in manual operation.

[0018] 3. After rinsing, peeling and pitting, the grapes are effectively hardened by adding specific concentrations of calcium ions and vitamin C in the hardening soaking device. Calcium ions, as a hardener, can increase the hardness of the grapes without affecting the original flavor, making the grapes less likely to soften during subsequent processing and storage; while vitamin C, as a color preservative, helps maintain the bright color of the grapes and prevents oxidation and discoloration. By precisely controlling the calcium ion concentration between 0.03% and 0.2% and the vitamin C dosage between 0.03% and 0.15%, the hardening effect is guaranteed and the adverse effects caused by excessive addition are avoided. In addition, the hardener and color preservative in the soaking liquid work together to not only improve the appearance quality of the canned grapes, but also extend the shelf life of the product, ultimately achieving the beneficial effects of improving product quality and extending the shelf life.

[0019] 4. Use low-temperature long-time sterilization (78-84℃, 15-25min). Low-temperature sterilization is more conducive to maintaining the flavor of the product. In addition, the overall processing speed of the product is fast, which is conducive to controlling the initial microorganisms of canned products and making low-temperature sterilization possible. In addition, low-temperature long-time sterilization further improves calcium ion penetration, avoids excessive temperature and softening of the meat, and is conducive to the hardening effect.

[0020] 5. Use process adjustment to shorten processing time: Normally, it takes 4-6 hours to produce canned grape products. Through process adjustment, continuous production only takes 1.5-2.5 hours. Due to the reduction of the initial value of microorganisms, the sterilization water temperature can be reduced. The product temperature is controlled at 75°C, which is 3 degrees lower than the normal 78 degrees.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the first viewing angle structure provided by the present invention;

[0023] Figure 2 is a second viewing angle schematic diagram provided by the present invention;

[0024] Figure 3 It is a schematic diagram of a delimbing device provided by the present invention;

[0025] Figure 4 It is a schematic diagram of an inverted trapezoidal box provided by the present invention;

[0026] Figure 5 It is a schematic diagram of the interior of the inverted trapezoidal box provided by the present invention;

[0027] Figure 6 is a schematic diagram of a spray device provided by the present invention;

[0028] Figure 7It is a schematic diagram of the annular separation network provided by the present invention;

[0029] Figure 8 is a schematic diagram of a delimbing roller provided by the present invention;

[0030] Fig. 9 It is a schematic diagram of the hardening immersion device provided by the present invention.

[0031] In the figure: 1, flap; 2, spray device; 21, longitudinal nozzle; 22, oblique nozzle; 23, first connecting pipe; 24, second connecting pipe; 25, water distribution pipe; 26, water inlet pipe; 27, air inlet pipe; 3, brush device; 31, flange; 32, magnet block; 33, first brush roller; 34, second brush roller; 35, first motor; 36, inverted trapezoidal box; 4, threshing device; 41, second motor; 42, first box; 43, smooth roller; 44, threshing roller; 5, delimbing device; 51 , branch outlet; 52, fourth motor; 53, inspection door; 54, first connecting box; 55, second box; 56, annular separation net; 57, debranching roller; 58, spiral conveying blade; 59, threshing blade; 510, separation rod; 6, peeling device; 61, peeling box; 62, supporting legs; 63, discharge port; 64, third motor; 65, second connecting box; 7, feeding pipe; 8, rinsing device; 9, core removal device; 10, conveyor belt; 11, sterilization device; 12, hardening and soaking device. DETAILED DESCRIPTION

[0032] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0033] Embodiment 1:

[0034] like Figure 1 , 2 , 3, 4, 7, 8, and 9 show a pretreatment device for a canned grape production line provided by an embodiment of the present invention.

[0035] The lower part of the brush device 3 is connected to the threshing device 4, the lower part of the threshing device 4 is connected to the debranching device 5, and the lower part of the debranching device 5 is connected to the hardening soaking device 12; the brush device 3 includes an inverted trapezoidal box 36, the upper side of the inner part of the inverted trapezoidal box 36 is rotatably connected to the first brush roller 33, and the lower side of the inner part of the inverted trapezoidal box 36 is rotatably connected to the second brush roller 34, the first brush roller 33 and the second brush roller 34 can drive the grapes to move in the inverted trapezoidal box 36 and rotate to loosen the pulp; the threshing device 4 includes a first box 42, the first box 42 The smooth roller 43 and the threshing roller 44 are rotatably connected inside, and the grapes can be threshed when passing through the gap between the smooth roller 43 and the threshing roller 44; the debranching device 5 includes a first connection box body 54, and the right side of the first connection box body 54 is connected to a second box body 55, and the interior of the second box body 55 is provided with an annular separation net 56, and the interior of the annular separation net 56 is provided with a debranching roller 57; the peeling device 6 includes a peeling box body 61, and the interior of the peeling box body 61 is provided with a solution added with alkali corrosion, and the upper part of the peeling box body 61 is provided with a feeding pipe 7;

[0036] It also includes a rinsing device 8, the lower part of which is connected to a core removal device 9, the lower part of which is connected to a conveyor belt 10, one end of which is connected to a hardening and soaking device 12, the interior of which is provided with a soaking solution to which a hardener and a color preservative are added; it also includes a sterilization device 11, which is used for product sterilization, and the hardening and soaking takes 30 minutes.

[0037] It is worth noting that the sterilization of the prior art: general sterilization conditions are 84-88 degrees, and the medium temperature is 78 degrees. Due to the high sterilization temperature and short time, the high temperature has a greater impact on the crispness of the pulp;

[0038] Adjustment of the internal sterilization process of sterilization device 11: sugar water plus calcium combined with relatively low temperature and long-term sterilization is conducive to the secondary penetration of calcium ions. The sterilization temperature is 78-84°C, the time is 15 to 25 minutes, and the product temperature is 75°C, which plays a sterilization role.

[0039] The precise ratio of calcium ions and vitamin C can effectively improve the texture and color of grapes, ensuring the hardening effect while also ensuring the beauty and flavor of the grapes. This formula can not only improve the hardness of grapes, but also maintain their bright color, increasing the market competitiveness of the product.

[0040] The hardener is calcium ion, and the calcium ion concentration ranges from 0.03% to 0.2%. The color preservative is vitamin C, and the amount of vitamin C ranges from 0.03% to 0.15%.

[0041] The upper part of the inverted trapezoidal box body 36 is connected with a flange 31 , and a magnet block 32 is embedded on the flange 31 . The flip cover 1 is an iron cover plate, and a plurality of first motors 35 are connected to the inverted trapezoidal box body 36 .

[0042] The magnet block 32 is designed to absorb the iron plate, and the iron cover plate can be firmly fixed by the magnet block 32 to prevent the flip cover from sliding off during cleaning; and the first motor 35 is responsible for driving the brush device 3 to operate to ensure the cleaning effect. This design not only facilitates daily operation, but also improves the safety and reliability of the equipment.

[0043] Two second motors 41 are connected to the first box body 42 , and the second motors 41 drive the smooth roller 43 and the threshing roller 44 to rotate respectively.

[0044] By setting two independent second motors 41, the speeds of the smooth roller 43 and the threshing roller 44 can be controlled respectively, ensuring the controllability and efficiency of the threshing process. This independent drive design allows the equipment to adjust the speed according to the different characteristics of the grapes, thereby achieving the best threshing effect.

[0045] A leg 62 is welded to the lower portion of the peeling box 61 , and a discharge port 63 is provided at the lower portion of the peeling box 61 , to which a valve is connected.

[0046] The design of the legs 62 ensures the stability of the peeling box 61, and the discharge port 63 with a valve facilitates the discharge of the grapes after the soaking is completed, and can also control the discharge of the soaking liquid for easy recycling. This design not only improves the stability of the equipment, but also increases environmental benefits.

[0047] A third motor 64 is connected to one side of the peeling box 61 , and an output shaft of the third motor 64 passes through the interior of the peeling box 61 and is welded with a peeling roller.

[0048] The stirring blades driven by the third motor 64 can ensure that the soaking liquid is evenly distributed, promote the full absorption of calcium ions and vitamin C, and improve the uniformity and effect of hardening. This design allows the grapes to be evenly exposed to the hardener and color retainer during the soaking process, thereby improving the quality and efficiency of hardening.

[0049] A second connecting box 65 for connecting to the second box 55 is welded to the upper part of the peeling box 61 , and an inspection door 53 is connected to the right side of the second box 55 , and a fourth motor 52 is connected to the inspection door 53 .

[0050] The design of the inspection door 53 facilitates regular inspection and maintenance of the equipment to ensure its normal operation; the fourth motor 52 is responsible for driving the delimbing roller 57 to ensure the efficient delimbing process. This design not only simplifies the maintenance process, but also improves the reliability and production efficiency of the equipment.

[0051] The output shaft of the fourth motor 52 is drivingly connected to the debranching roller 57 , on which a spiral conveying blade 58 , a threshing blade 59 and a separating rod 510 are welded. The lower right side of the second box body 55 is connected to a branch outlet 51 .

[0052] This design makes the debranching process more efficient. Through the coordinated work of the spiral conveying blades 58, the threshing blades 59 and the separation rod 510, the effective separation of branches and fruits is achieved. At the same time, the design of the branch outlet 51 facilitates the discharge of branches, ensuring the thoroughness and continuity of debranching.

[0053] When in use, grapes are placed inside the inverted trapezoidal box 36, and the first brush roller 33 and the second brush roller 34 can drive the grapes to move inside the inverted trapezoidal box 36, and rotate to loosen the pulp, thereby loosening the branches and grapes. After loosening, it is convenient for the next step of threshing to reduce the scratching of the pulp by the branches. Then the grapes fall into the threshing device 4, and the grapes can be threshed when passing through the gap between the light roller 43 and the threshing roller 44. Then the branches and grapes enter the debranching device 5, and the interior of the second box 55 is provided with an annular separation net 56, and the interior of the annular separation net 56 is provided with a debranching roller 57, which can be rotated. The pulp and branches are transported and separated to play a processing role. Then the grapes enter the peeling box 61. The interior of the peeling box 61 is provided with a solution with added alkali corrosion, and the peeling drum is driven by the third motor 64 to move to achieve peeling. Then the peeled grapes are manually scooped and poured into the rinsing device 8. After rinsing in the rinsing device 8, the grapes enter the pitting device 9. The pitted grapes enter through the valve at the bottom of the pitting device 9, the conveyor belt 10, one end of the conveyor belt 10 is connected to the hardening soaking device 12, the interior of the hardening soaking device 12 is provided with a soaking solution with added hardener and color preservative, and the hardening soaking takes 30 minutes.

[0054] After the grapes are hardened, they need to be canned, added with soup, sealed, and then enter the sterilization device 11. The soup is added with a specific concentration of calcium ions and vitamin C, which realizes the effective synergistic hardening treatment of the grape pulp during the low-temperature and long-term heating process.

[0055] The sterilization device 11 adopts low-temperature long-time sterilization (78-84°C, 15-25min). Low-temperature sterilization is more conducive to maintaining the flavor of the product. In addition, the overall processing speed of the product is fast (time 1.5-2.5h), which is conducive to controlling the initial microorganisms of the canned product, making low-temperature sterilization possible. In addition, low-temperature long-time sterilization further improves the penetration of calcium ions, avoids the softening of the meat due to excessive temperature, and is conducive to the hardening effect. Calcium ions, as a hardener, can increase the hardness of the grapes without affecting the original flavor of the grapes, making the grapes less likely to soften during subsequent processing and storage; and vitamin C, as a color preservative, helps to maintain the bright color of the grapes and prevent oxidation and discoloration.

[0056] Embodiment 2:

[0057] like Figures 1 to 8 As shown, a pretreatment device for a canned grape production line is provided in an embodiment of the present invention.

[0058] The lower part of the brush device 3 is connected to the threshing device 4, the lower part of the threshing device 4 is connected to the debranching device 5, and the lower part of the debranching device 5 is connected to the hardening soaking device 12; the brush device 3 includes an inverted trapezoidal box 36, the upper side of the inner part of the inverted trapezoidal box 36 is rotatably connected to the first brush roller 33, and the lower side of the inner part of the inverted trapezoidal box 36 is rotatably connected to the second brush roller 34, the first brush roller 33 and the second brush roller 34 can drive the grapes to move in the inverted trapezoidal box 36 and rotate to loosen the pulp; the threshing device 4 includes a first box 42, the inner part of the first box 42 is rotatably connected to the light roller 43 and the threshing roller 44, and the grapes can be threshed when passing through the gap between the light roller 43 and the threshing roller 44; the debranching device 5 includes a first connection A box body 54, a second box body 55 is connected to the right side of the first connecting box body 54, an annular separation net 56 is provided inside the second box body 55, and a debranching roller 57 is provided inside the annular separation net 56; the peeling device 6 includes a peeling box body 61, the interior of the peeling box body 61 is provided with a solution with added alkali corrosion, and the upper part of the peeling box body 61 is provided with a feeding pipe 7; it also includes a rinsing device 8, the lower part of the rinsing device 8 is connected to a core removal device 9, the lower part of the core removal device 9 is connected to a conveyor belt 10, one end of the conveyor belt 10 is connected to a hardening soaking device 12, the interior of the hardening soaking device 12 is provided with a soaking solution with added hardener and color preservative; it also includes a sterilization device 11 for product sterilization.

[0059] The right side of the inverted trapezoidal box 36 is rotatably connected with a flip cover 1 , on which a spray device 2 is mounted. The spray device 2 includes an oblique spray head 22 and a longitudinal spray head 21 , and the oblique spray head 22 and the longitudinal spray head 21 are connected via a first connecting pipe 23 .

[0060] This design ensures that the grapes are fully sprayed during the cleaning process. The oblique nozzle 22 can effectively remove impurities attached to the surface of the grapes, while the longitudinal nozzle 21 can penetrate into the gaps between the grapes for cleaning, thereby improving the efficiency and thoroughness of cleaning.

[0061] The first connecting pipe 23 is connected to a second connecting pipe 24 for connecting a plurality of groups of oblique nozzles 22 and the longitudinal nozzles 21 . The second connecting pipe 24 is connected to a water distribution pipe 25 . The two ends of the water distribution pipe 25 are respectively connected to a water inlet pipe 26 and an air inlet pipe 27 .

[0062] Through such an arrangement, the spray system can not only provide a stable and uniform water flow, but also introduce gas to produce a spray effect, thereby enhancing the cleaning ability. At the same time, the design of multiple groups of nozzles ensures the uniform distribution of water flow, further improving the cleaning effect.

[0063] This embodiment adds a spray device 2 on the basis of the first embodiment. Through the oblique spray head 22 and the longitudinal spray head 21 embedded in the flip cover 1, it plays the role of spraying water at multiple angles, and can spray and clean the grapes while they enter the inverted trapezoidal box 36 to loosen the pulp. The two ends of the water distribution pipe 25 are respectively connected to the water inlet pipe 26 and the air inlet pipe 27, which can be connected to tap water and compressed air at the same time, so as to increase the spray pressure and make the cleaning more thorough.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for a canned grape production line, comprising a brush device (3), characterized in that: The lower part of the brush device (3) is connected to a threshing device (4), the lower part of the threshing device (4) is connected to a debranching device (5), and the lower part of the debranching device (5) is connected to a peeling device (6); The brush device (3) comprises an inverted trapezoidal box (36), the upper side of the inner part of the inverted trapezoidal box (36) is rotatably connected to a first brush roller (33), and the lower side of the inner part of the inverted trapezoidal box (36) is rotatably connected to a second brush roller (34), the first brush roller (33) and the second brush roller (34) can drive the grapes to move in the inverted trapezoidal box (36) and rotate to loosen the pulp; The threshing device (4) comprises a first housing (42), wherein a smooth roller (43) and a threshing roller (44) are rotatably connected inside the first housing (42), and the grapes can be threshed when passing through the gap between the smooth roller (43) and the threshing roller (44); The debranching device (5) comprises a first connecting box (54), the right side of which is connected to a second box (55), an annular separation net (56) is provided inside the second box (55), and a debranching roller (57) is provided inside the annular separation net (56); The peeling device (6) comprises a peeling box (61), the interior of the peeling box (61) is provided with a solution added with alkali corrosion, and the upper part of the peeling box (61) is provided with a feeding pipe (7); The invention also comprises a rinsing device (8), the lower part of which is connected to a core removal device (9), the lower part of which is connected to a conveyor belt (10), one end of which is connected to a hardening and soaking device (12), the interior of which is provided with a soaking solution to which a hardener and a color retaining agent are added; and a sterilizing device (11) for sterilizing the product.

2. A pretreatment device for a canned grape production line according to claim 1, characterized in that: The right side of the inverted trapezoidal box (36) is rotatably connected to a flip cover (1), and a spray device (2) is installed on the flip cover (1). The spray device (2) comprises an oblique spray head (22) and a longitudinal spray head (21), and the oblique spray head (22) and the longitudinal spray head (21) are connected via a first connecting pipe (23).

3. The pretreatment device for a canned grape production line according to claim 2, characterized in that: The first connecting pipe (23) is connected to a second connecting pipe (24) for connecting a plurality of groups of oblique nozzles (22) and longitudinal nozzles (21); the second connecting pipe (24) is connected to a water distribution pipe (25); and the two ends of the water distribution pipe (25) are respectively connected to a water inlet pipe (26) and an air inlet pipe (27).

4. The pretreatment device for a canned grape production line according to claim 2, characterized in that: The upper part of the inverted trapezoidal box body (36) is connected to a flange (31), a magnet block (32) is embedded on the flange (31), the flip cover (1) is an iron cover plate, and the inverted trapezoidal box body (36) is connected to a plurality of first motors (35).

5. The pretreatment device for a canned grape production line according to claim 1, characterized in that: The first box body (42) is connected to two second motors (41), and the second motors (41) respectively drive the smooth roller (43) and the threshing roller (44) to rotate.

6. The pretreatment device for a canned grape production line according to claim 1, characterized in that: The hardener is calcium ion, and the concentration of calcium ion is in the range of 0.03%-0.2%. The color protecting agent is vitamin C, and the dosage of vitamin C is in the range of 0.03%-0.15%.

7. The pretreatment device for a canned grape production line according to claim 1, characterized in that: A leg (62) is welded to the lower part of the peeling box (61), and a discharge port (63) is provided at the lower part of the peeling box (61), and a valve is connected to the discharge port (63).

8. The pretreatment device for a canned grape production line according to claim 1, characterized in that: A third motor (64) is connected to one side of the peeling box (61), and an output shaft of the third motor (64) passes through the interior of the peeling box (61) and is welded with a peeling roller.

9. The pretreatment device for a canned grape production line according to claim 1, characterized in that: A second connecting box (65) for connecting to a second box (55) is welded to the upper part of the peeling box (61); an inspection door (53) is connected to the right side of the second box (55); and a fourth motor (52) is connected to the inspection door (53).

10. The pretreatment device for canned grape production line according to claim 9, characterized in that: The output shaft of the fourth motor (52) is drivingly connected to a debranching roller (57), a spiral conveying blade (58), a threshing blade (59) and a separation rod (510) are welded to the debranching roller (57), and a branch outlet (51) is connected to the lower right side of the second box body (55).

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