Pasteurization methods for packaged meat products

Abstract

The present invention discloses a pasteurization method for meat packaged food, comprising the following steps: injecting water into a chassis, heating the water in the chassis, so that the water temperature in the chassis is within the temperature range to be reached by the material to be pasteurized; lifting a placement rack filled with material trays of various layers by a sling and placing it into the chassis; closing the top opening of the chassis with cover A and cover B; the hot water sprayed from the liquid spray pipe enters the liquid return tank from the liquid return hole after passing through the food, enters the circulating liquid return pipe through the liquid return branch pipe, and heats the water in the circulating liquid inlet pipe through the heat exchange sleeve; when the placement rack is placed in the chassis for a required time, the placement rack is lifted by the sling and turned over to cool. From the above process, it can be seen that the pasteurization method for meat packaged food of the present invention enables the food material placed in the chassis to be immediately placed in water within the pasteurization temperature range, thereby starting pasteurization, thereby performing pasteurization as soon as possible, and improving the sterilization efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of pasteurization equipment, in particular to a pasteurization method for packaged meat food. Background Art

[0002] With the development of food processing, more and more food processing has been automated. In order to match the automated and intelligent production process, the original food processing equipment needs to be improved.

[0003] In the food processing industry, packaged food needs to be sterilized to extend the shelf life of packaged food. At present, there are generally two ways to sterilize packaged food in food production companies. One is high-temperature sterilization and the other is low-temperature sterilization. Although high-temperature sterilization can sterilize more thoroughly, it will also destroy the nutrients in the food and even affect the taste of the food, and the energy consumption is relatively high. Low-temperature sterilization can maintain the original properties of the food while sterilizing, and will not destroy the vitamins, minerals and other nutrients in the food, thereby retaining the nutritional value of the food, and will not damage or deteriorate the taste of the food. It is particularly suitable for some temperature-sensitive foods.

[0004] In actual production, many manufacturers generally choose low-temperature sterilization to reduce their energy consumption. However, low-temperature sterilization also has a disadvantage, which is that the time required for low-temperature sterilization is generally relatively long. This may affect the production rhythm of the company.

[0005] At present, the most commonly used low-temperature sterilization is pasteurization. Pasteurization usually uses heat below 100°C for sterilization, and then uses low temperature for storage. Depending on the sterilization object, the temperature range of pasteurization is not necessarily the same. Basically, its temperature range can be between 62 degrees Celsius and 90 degrees Celsius.

[0006] Enterprises generally adopt a tunnel structure. Depending on the food to be sterilized, the temperature in the tunnel is adjusted to a matching pasteurization temperature range. The food materials to be sterilized are then conveyed through the tunnel, and the conveying speed is controlled so that the time the food to be sterilized stays in the tunnel is greater than or equal to the time required for pasteurization.

[0007] This results in a relatively slow transmission speed, and the tunnel structure requires a large amount of site area. In addition, the two ends of the tunnel structure are generally open structures to facilitate the entry and exit of trolleys loaded with materials into the tunnel, which leads to a large temperature loss in the tunnel. In order to maintain the temperature in the tunnel, a certain amount of energy consumption is required to ensure that the temperature in the tunnel is always within the pasteurization temperature range. Moreover, the opening of the two ends of the tunnel will inevitably cause the temperature at both ends of the tunnel to be lower than the temperature in the middle, which leads to uneven temperature, and then causes air flow in the tunnel to form wind, which further leads to a decrease in the temperature in the tunnel, resulting in adverse effects on the sterilization effect of the materials in the tunnel. It is necessary to provide additional heating devices to ensure that the temperature in the tunnel can be stabilized within the pasteurization temperature. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pasteurization method for packaged meat food, so that the food material placed in the box is immediately placed in water within the pasteurization temperature range, thereby starting pasteurization, thereby performing pasteurization as quickly as possible and improving the sterilization efficiency.

[0009] The technical solution adopted by the present invention is: A method for pasteurizing packaged meat products, comprising the following steps: 1) Before placing the material into the chassis, move cover A and cover B to the two ends of the chassis respectively, so that cover A and cover B close the top opening of the chassis; 2) Then water is added to the chassis through the liquid adding pipe. When the water volume in the chassis meets the following conditions, the liquid adding pipe stops adding water: after one placement rack is fixed in the chassis, after two placement racks are fixed in the chassis, the liquid level in the chassis is lower than or equal to the bottom pipe opening of the overflow pipe; 3) The processor controls the circulation pump to start, and increases the temperature of the heat source and the water in the circulating liquid inlet pipe passing through the heat exchange sleeve through the heat source inlet pipe, and then heats the water in the chassis through the water in the circulating liquid inlet pipe heated by the heat exchange sleeve, so that the water temperature in the chassis is within the temperature range to be reached by the material to be pasteurized; 4) When the temperature sensor detects that the water temperature in the chassis reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, cover plate A is moved to the maximum stroke facing cover plate B or cover plate B is moved to the maximum stroke facing cover plate A. At this time, the chassis is located at the top opening on one side of the spray pipe. The placement rack filled with material trays of each layer from top to bottom to be pasteurized is lifted by the lifting device and placed into the chassis from the opening. The supporting legs at the bottom of the placement rack are placed on the top surface of the placement block respectively, so as to ensure that the placement rack can be stably placed in the chassis, and then the lifting tool of the lifting device is separated from the placement rack; 5) After the placement rack is placed and fixed in the chassis, cover A and cover B are moved to the two ends of the chassis again, so that cover A and cover B close the top opening of the chassis; 6) The materials in the material trays of each layer of the rack are immersed in the water in the chassis, so they can reach the pasteurization temperature immediately. At the same time, the water temperature in the chassis of the rack will also be reduced due to the heat exchange with the material trays of each layer of the rack and the materials. The hot water heated by the heat exchange sleeve is sprayed horizontally to the materials of the material trays of each layer of the rack through each spray pipe to continue to transfer heat. After passing through the materials of the corresponding side material tray, the sprayed hot water will enter the return liquid tank on the corresponding side of the chassis through the return liquid hole, and then enter the circulating return liquid pipe through the return liquid branch pipe, and then enter the circulating liquid inlet pipe again through the circulating pump, and pass through the heat exchange sleeve again to heat the water in the circulating liquid inlet pipe. After being heated, the water in the circulating liquid inlet pipe enters the spray pipe again, and is sprayed to the materials of the corresponding layer of the material tray through the spray pipe again, so that the water temperature around the material is still within the pasteurization temperature range; 7) When the placement rack has been placed in the chassis for the time required for pasteurization, cover A is moved to the maximum stroke facing cover B or cover B is moved to the maximum stroke facing cover A. At this time, the top of the side where the pasteurized placement rack is placed in the chassis is open. The pasteurized placement rack is lifted by a lifting device and lifted out of the chassis from the open part, and then transferred to the cooling equipment to quickly cool the placement rack and the materials on each layer of the material tray fixed to the placement rack, thereby finally achieving pasteurization of the materials.

[0010] A further improvement of the present invention is that in step 2), the circulation pump is turned on at the same time to allow the water in the chassis to fill the circulation pipeline including the circulation liquid inlet pipe and the circulation liquid return pipe. When the circulation pipeline is full of water, the circulation pump is turned off.

[0011] A further improvement of the present invention is that in step 2), after the water in the chassis overflows from the overflow pipe, the height of the liquid level in the chassis is located at the lower edge of the pipe opening of the overflow pipe.

[0012] A further improvement of the present invention is that in the step 3), when the temperature sensor detects that the temperature of the water in the case is much lower than the lower limit of the temperature to be reached by the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe connected to one end of the circulating liquid inlet pipe flowing into the heat exchange sleeve to open, and the valve of the other heat source outlet branch pipe connected to the middle part of the side wall of the heat exchange sleeve to close, and then the heat source and the water temperature in the circulating liquid inlet pipe passing through the heat exchange sleeve are increased through the heat source inlet pipe, and the water in the case is continuously circulated through the circulating pump, so that the machine The water temperature in the box rises rapidly; when the temperature sensor detects that the water temperature in the box reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe connected to one end of the circulating liquid inlet pipe flowing into the heat exchange sleeve to close, and the valve of the other heat source outlet branch pipe connected to the middle part of the side wall of the heat exchange sleeve to open, and then the heat source and the water temperature in the circulating liquid inlet pipe passing through the heat exchange sleeve are increased through the heat source inlet pipe, and the water in the box is continuously circulated through the circulating pump, so that the water temperature in the box is accurately raised.

[0013] A further improvement of the present invention is that in the step 2), the filling pipe fills water into the chassis until the liquid level is flush with the bottom pipe opening of the overflow pipe and the water filling is stopped. In the step 5), during the process of placing the placement rack into the chassis, the liquid level in the chassis, which was originally flush with the bottom pipe edge of the overflow pipe, rises due to the placement rack. When the liquid level rises, the water in the chassis will flow out of the chassis through the overflow pipe again.

[0014] A further improvement of the present invention is that in the step 6), the pasteurization temperature range of the material to be pasteurized is divided into a lower temperature range, an intermediate temperature range and an upper temperature range in order from low to high temperatures; when the temperature sensor detects that the water temperature in the case is within the pasteurization temperature range close to the lower temperature range, the heat source flow rate into the heat source pipe is increased to improve the heat exchange efficiency of the heat exchange sleeve, thereby preventing the water temperature in the case from being lower than the pasteurization temperature range, and returning the water temperature in the case to the intermediate temperature range of the pasteurization temperature range; when the temperature sensor detects that the water temperature in the case is within the pasteurization temperature range close to the lower temperature range, the heat source flow rate into the heat source pipe is increased to improve the heat exchange efficiency of the heat exchange sleeve, thereby preventing the water temperature in the case from being lower than the pasteurization temperature range, and returning the water temperature in the case to the intermediate temperature range of the pasteurization temperature range; When the water temperature in the chassis is in the middle temperature area of ​​the pasteurization temperature range, the heat source flow rate entering the heat source pipe is reduced to return the heat exchange efficiency of the heat exchange sleeve to the initial state, thereby stabilizing the water temperature in the chassis within the middle temperature area of ​​the pasteurization temperature range; when the temperature sensor detects that the water temperature in the chassis is within the pasteurization temperature range close to the upper limit temperature area, the heat source flow rate entering the heat source pipe is increased to improve the heat exchange efficiency of the heat exchange sleeve, thereby avoiding the water temperature in the chassis from being higher than the pasteurization temperature range and returning the water temperature in the chassis to the middle temperature area of ​​the pasteurization temperature range.

[0015] A further improvement of the present invention is that, when the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is greater than or equal to 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is 3 degrees Celsius higher than the lower temperature limit, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is 2 degrees Celsius lower than the upper temperature limit; when the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is less than 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is the sum of the lower temperature limit and 40% of the temperature difference between the upper and lower limits, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is the difference between the upper temperature limit and 20% of the temperature difference between the upper and lower limits.

[0016] The beneficial effects of the present invention are: First, the pasteurization method of packaged meat food of the present invention allows the food materials placed in the cabinet to be immediately placed in water within the pasteurization temperature range, thereby starting pasteurization, thereby performing pasteurization as quickly as possible and improving the sterilization efficiency.

[0017] Second, the pasteurization method of packaged meat food of the present invention uses a circulating heating method so that the amount of water in the cabinet will not change, so that the materials on the shelf are always within the pasteurization temperature range, and the pasteurization effect is always guaranteed.

[0018] Third, the pasteurization method of packaged meat food of the present invention can change the heat exchange effect by using different flow rates and heat exchange degrees of the heat source according to the change of water temperature in the chassis, thereby providing different heating effects on the packaged product materials under different conditions.

[0019] Fourth, in the pasteurization method of packaged meat food of the present invention, when the food material is in different temperature ranges of pasteurization, the heat source heats the water in the circulating liquid inlet pipe to different degrees through different heat exchange effects, so that the water entering the chassis always meets the pasteurization requirements.

[0020] Fifth, the pasteurization method of packaged meat food of the present invention ensures that there is enough space between the top of the placement rack and the liquid surface by injecting water into the chassis to the bottom of the overflow pipe, thereby avoiding that the top of the placement rack is close to the liquid surface, causing the water temperature of the corresponding area where the material on the top is located to decrease due to the large contact area with the outside world, thereby affecting the pasteurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional schematic diagram of the present application located on the side where the pipeline is located.

[0022] Figure 2 This is a three-dimensional schematic diagram of the present application located on the side facing away from the pipeline.

[0023] Figure 3 The top view schematic diagram of the top cover A and the top cover B is hidden for this application.

[0024] Figure 4 A three-dimensional schematic diagram at one end with top cover A and top cover B hidden for the purpose of this application.

[0025] Figure 5 For this application, the top view schematic diagram is shown with the top cover A and the top cover B hidden after the material rack is placed. DETAILED DESCRIPTION

[0026] Combination Figure 1~Figure 5 It can be seen that the pasteurizer for multi-layer material trays includes a chassis 1 with an open top, and a middle part of the chassis 1 is provided with multiple layers of spray pipes 6 respectively connected to the circulating liquid inlet pipe 13 from bottom to top, and the liquid sprayed by the spray pipe 6 is sprayed horizontally to the side walls of the chassis 1 at both ends at the same time, and the side walls at both ends of the chassis 1 are respectively provided with liquid return devices connected to the circulating liquid return pipe 14, and the liquid return devices are respectively provided with a plurality of liquid return holes 9 corresponding to each spray pipe 6. The liquid in the circulating liquid return pipe 14 enters the circulating liquid inlet pipe 13 through the circulating pump 12, and the part of the circulating liquid inlet pipe 13 located outside the chassis 1 passes through the heating device. The placement racks 27 with multiple layers of materials are placed respectively at the position between the spray pipe 6 and the side wall of the chassis 1, and the liquid sprayed horizontally by the spray pipe 6 corresponds to the materials of each layer of material tray 28 placed on the placement rack 27. The upper part of the side wall of the chassis 1 is also provided with a temperature sensor 23, and the temperature sensor 23 is lower than the liquid level in the chassis 1.

[0027] Each liquid spray pipe 6 is provided with two groups of liquid spray nozzles 7, which spray liquid toward the materials in the corresponding material trays 28 on both sides of the liquid spray pipe 6 respectively; each group of liquid spray nozzles 7 is provided with multiple ones, which are distributed along the extension direction of the liquid spray pipe 6.

[0028] The return liquid holes 9 are provided in multiple groups corresponding to the positions of the liquid sprayed from each spray pipe 6, each group of return liquid holes 9 is provided with multiple rows along the extension direction perpendicular to the spray pipe 6, and each row of return liquid holes 9 is evenly provided with multiple return liquid holes 9 along the extension direction parallel to the spray pipe 6.

[0029] The liquid return device includes a liquid return groove 8 fixed to the side wall of the end where the chassis 1 is located. The groove of the liquid return groove faces away from the liquid spray pipe 6 and is sealed and fixed to the chassis 1. The liquid return hole 9 is arranged at the bottom of the liquid return groove 8. The circulating liquid return pipe 14 is connected with the liquid return branch pipe 15 through a tee. The liquid return branch pipe 15 passes through the bottom plate 4 and the bottom groove wall of the liquid return groove 8 from the bottom plate 4 of the chassis 1 and the position corresponding to the liquid return device, and then communicates with the inside of the liquid return groove 8.

[0030] The portion of the liquid return branch pipe 15 located in the liquid return tank is connected to a plurality of liquid return branch pipes from bottom to top, the number and position of the liquid return branch pipes respectively correspond to each liquid spray pipe 6, and a strip hole is provided on one side of the liquid return branch pipe facing the liquid return hole 9 of the liquid return tank along the extension direction of the liquid return branch pipe.

[0031] The heating device includes a heat exchange sleeve 19 coaxially wrapped and fixed to the outer wall of the circulating liquid inlet pipe 13, the circulating liquid inlet pipe 13 corresponds to a tube bundle formed by a plurality of parallel thin unit tubes in the heat exchange sleeve 19, and connectors are provided at both ends of the tube bundle, and the connectors seal and connect the corresponding ends of each thin unit tube with the circulating liquid inlet pipe 13, and the side wall of the heat exchange sleeve 19 is located at the end where the circulating liquid inlet pipe 13 flows out of the heat exchange sleeve 19 and is connected with a heat inlet pipe 20, and the side wall of the heat exchange sleeve 19 is also connected with a heat outlet pipe 21, and the heat outlet pipe 21 is respectively connected with two heat outlet branch pipes 22, one of which is connected to the end of the side wall of the heat exchange sleeve 19 where the circulating liquid inlet pipe 13 flows into the heat exchange sleeve 19, and the other heat outlet branch pipe 22 is connected to the middle part of the side wall of the heat exchange sleeve 19.

[0032] The thin unit tube is a spiral tube, and the spiral axis of the spiral tube is coaxially arranged with the circulating liquid inlet pipe 13 connected to the two ends of the heat exchange sleeve 19.

[0033] The top of the side wall of the chassis 1 is connected to a liquid adding pipe 18, the bottom plate 4 at the bottom of the chassis 1 is connected to a liquid drain pipe 16, and the upper part of the side wall of the chassis 1 is connected to an overflow pipe 31, and the height of the overflow pipe 31 is higher than the material at the top of the placement rack 27 placed in the chassis 1.

[0034] The bottom plate 4 is tilted downward from both sides to the middle to form a "V"-shaped structure. The drain pipe 16 is located at the bottom of the "V"-shaped structure. A filtering device 17 is provided at the connection between the drain pipe 16 and the bottom plate 4.

[0035] The liquid adding pipe 18 , the liquid discharging pipe 16 and the overflow pipe 31 are all connected to the water storage device respectively.

[0036] The top of the bottom plate 4 is provided with a positioning block 26 for placing the supporting legs of the connecting placement frame 27, and the top surfaces of the positioning blocks 26 located on the same side of the liquid spraying pipe 6 are flush and horizontal.

[0037] The liquid spraying pipes 6 are respectively communicated with the connecting risers 5 , and the circulating liquid inlet pipes 13 extend into the chassis 1 and communicate with the connecting risers 5 .

[0038] The top surface area of ​​the placement block 26 is larger than the bottom surface area of ​​the support legs of the placement rack 27 .

[0039] A connecting horizontal plate 10 is fixed to the top of the chassis 1, and both ends of the connecting horizontal plate 10 are fixedly connected to the side walls of the chassis 1 on both sides. A connecting vertical plate 11 is fixed to the bottom of the connecting horizontal plate 10, and the spray pipes 6 are fixed to the connecting vertical plates 11 respectively.

[0040] The top of the chassis 1 is also provided with a cover A2 and a cover B3 that slide back and forth along the top edges of the side walls on both sides of the chassis 1. The cover B3 is located on the outside of the cover A2. When the cover A2 and the cover B3 are respectively moved to two different ends of the chassis 1, the edge of the cover A2 facing the cover B3 is located within the range of the cover B3. When the cover A2 and the cover B3 are respectively moved to the same end of the chassis 1, the placement rack 27 placed in the chassis 1 away from the cover A2 and the cover B3 is located within the open range of the chassis 1.

[0041] The top of the two side walls of the chassis 1 are symmetrically provided with tracks 24 along the extension direction of the side walls, and the tracks 24 include inner tracks and outer tracks. The bottom of the two side edges of the cover A2 reciprocates along the inner tracks, and the bottom of the two side edges of the cover B3 reciprocates along the outer tracks.

[0042] The outer sides of the top edges of the two side walls of the chassis 1 are symmetrically provided with guide longitudinal rods 25 arranged parallel to the extending direction of the side walls, and the cover plate B3 is slidably connected to the guide longitudinal rods 25 via sliders.

[0043] The bottom and sides of the material tray 28 are evenly provided with liquid holes.

[0044] The overflow pipe 31 is communicated with a water storage device connected to the liquid adding pipe 18 .

[0045] It also includes a processor, and the temperature sensor 23, the heat source pump and the circulation pump are electrically connected to the processor respectively.

[0046] Each liquid spray pipe corresponds to the liquid return hole of the liquid return tank, so that the liquid sprayed by the liquid spray pipe can enter the liquid return tank from the liquid return hole at the corresponding position for circulation after being sprayed horizontally, and the amount of liquid sprayed is exactly equal to the amount of liquid circulating in the liquid return tank through the liquid return hole, which will not affect the total amount of liquid in the chassis, thereby forming a laminar flow phenomenon, and multiple layers are arranged from top to bottom, and the amount of liquid sprayed on each layer is equal to the amount of liquid circulating in the liquid return tank, so that the materials on each layer of the material tray of the entire placement rack can effectively maintain the temperature of the surrounding water area through the liquid sprayed by the corresponding liquid spray pipe, so that they can be effectively kept in the required temperature range for a long time, thereby achieving the effect of pasteurization.

[0047] Through the function of the liquid return groove and the liquid return hole, the influence of the liquid return pipe connected to the circulation pump on the surrounding water when it generates negative pressure water absorption in the chassis can be weakened as much as possible, so that only the liquid sprayed by the liquid spray pipe that is spraying liquid is affected, so that the liquid sprayed by the liquid spray pipe can only effectively act on the material on the corresponding layer of the material tray of the placement rack. When the power of the circulation pump is constant, the circulation efficiency and water circulation rate can be effectively improved, and when the water circulation rate is constant, the power of the circulation pump can be effectively reduced.

[0048] By setting two heat source branch pipes at different connection positions of the heat exchange sleeve, two connection modes with different heat exchange degrees can be provided according to the water temperature heating requirements in the chassis under the condition that the heat source flow rate remains unchanged. This can not only improve the heating speed when the temperature in the chassis is lower than the lower limit of the pasteurization temperature, but also improve the temperature regulation accuracy when the temperature in the chassis reaches the pasteurization temperature range.

[0049] Through the structure of the circulating liquid inlet pipe at the position of the heat exchange sleeve, the heat source in the heat exchange sleeve can fully contact and exchange heat with the circulating liquid inlet pipe, further effectively improving the heat exchange efficiency of the heat exchange sleeve to the circulating liquid inlet pipe.

[0050] Through the structure of the chassis bottom plate and the connection position of the drain pipe and the bottom plate, the water in the chassis can be drained as much as possible. The bottom plate structure can also allow impurities in the water in the chassis to settle at the bottom of the chassis and there is a distance between the impurities and the material tray at the bottom of the rack placed in the chassis, thereby preventing impurities from contaminating the materials in the material tray.

[0051] The filter device provided in the drain pipe can prevent the drain pipe from discharging impurities into the water storage device.

[0052] Through the positioning and placement blocks provided on the bottom plate, not only can the placement rack be accurately placed between the liquid spray pipe and the liquid return tank, but the positioning and placement blocks can also improve the supporting performance, avoid deformation of the chassis bottom plate, and ensure the stability of the placement rack after placement, and the height of each layer of material tray matches the liquid return hole of the corresponding liquid spray pipe and liquid return tank.

[0053] The connection height between the overflow pipe and the chassis ensures that the materials in the material trays of each layer of the placement rack in the chassis are below the liquid level in the chassis, ensuring that the materials can be pasteurized.

[0054] Through the connection structure between cover A and cover B and the chassis, the rack can remain closed except when the chassis is placed in or taken out, thereby minimizing heat loss caused by heat dissipation from the water temperature in the chassis to the outside and preventing the water in the chassis from being contaminated by the outside air.

[0055] Combination Figure 1~Figure 5 It can be seen that the pasteurization method of packaged meat food includes the following steps: 1) Before placing the material into the chassis 1, first move the cover A2 and the cover B3 to the two ends of the chassis 1 respectively, so that the cover A2 and the cover B3 close the top opening of the chassis 1; 2) Then water is injected into the chassis 1 through the liquid injection pipe 18. When the amount of water in the chassis 1 meets the following conditions, the liquid injection pipe 18 stops injecting water: after one placement rack 27 is fixed in the chassis 1, after two placement racks 27 are fixed in the chassis 1, the liquid level in the chassis 1 is lower than or equal to the bottom pipe opening of the overflow pipe 31; 3) The processor controls the circulation pump 12 to start, and increases the temperature of the heat source and the water in the circulation liquid inlet pipe 13 passing through the heat exchange sleeve 19 through the heat source inlet pipe 20, and then heats the water in the chassis 1 through the water in the circulation liquid inlet pipe 13 heated by the heat exchange sleeve 19, so that the water temperature in the chassis 1 is within the temperature range to be reached by the material to be pasteurized; 4) When the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, the cover plate A2 is moved to the maximum stroke position facing the cover plate B3 or the cover plate B3 is moved to the maximum stroke position facing the cover plate A2. At this time, the chassis 1 is located at the top opening on one side of the spray pipe 6. The placement rack 27 filled with material trays 28 of various layers from top to bottom to be pasteurized is lifted by the lifting device and placed into the chassis 1 from the opening, and the supporting legs at the bottom of the placement rack 27 are placed on the top surface of the placement block 26 respectively, so as to ensure that the placement rack 27 can be stably placed in the chassis 1, and then the lifting tool of the lifting device is separated from the placement rack 27; 5) After the placement rack 27 is placed and fixed in the chassis 1, the cover A2 and the cover B3 are moved to the two ends of the chassis 1 again, so that the cover A2 and the cover B3 close the top opening of the chassis 1; 6) The materials in the material trays 28 of each layer of the rack 27 are immersed in the water in the chassis 1, so they can immediately reach the pasteurization temperature. At the same time, the water temperature in the chassis 1 of the rack 27 will also be reduced due to heat exchange with the material trays 28 of each layer of the rack 27 and the materials. The hot water heated by the heat exchange sleeve 19 is sprayed horizontally to the materials of the material trays 28 of each layer of the rack 27 through each spray pipe 6 and continues to transfer heat. The sprayed hot water passes through the corresponding side The material in the material tray 28 will enter the liquid return tank 8 on the corresponding side of the chassis 1 through the liquid return hole 9, and then enter the circulating liquid return pipe 14 through the liquid return branch pipe 15, and then enter the circulating liquid inlet pipe 13 again through the circulating pump 12, and pass through the heat exchange sleeve 19 again to heat the water in the circulating liquid inlet pipe 13. After being heated, the water in the circulating liquid inlet pipe 13 will enter the liquid spray pipe 6 again, and will be sprayed to the material in the corresponding layer of the material tray 28 through the liquid spray pipe 6 again, so that the water temperature around the material is still within the pasteurization temperature range; 7) When the placement rack 27 has been placed in the chassis 1 for the time required for pasteurization, the cover A2 is moved to the maximum stroke facing the cover B3 or the cover B3 is moved to the maximum stroke facing the cover A2. At this time, the top of the side where the pasteurized placement rack 27 is placed in the chassis 1 is open. The pasteurized placement rack 27 is lifted by a lifting device and lifted away from the chassis 1 from the open part, and transferred to the cooling equipment to quickly cool the placement rack 27 and the materials on the material trays 28 on each layer fixed to the placement rack 27, thereby finally achieving pasteurization of the materials.

[0056] In step 2), the circulation pump 12 is turned on at the same time so that the water in the chassis 1 can fill the circulation pipeline including the circulation liquid inlet pipe 13 and the circulation liquid return pipe 14. When the circulation pipeline is full of water, the circulation pump 12 is turned off.

[0057] In the step 2), after the water in the chassis 1 overflows from the overflow pipe 31 , the height of the liquid level in the chassis 1 is located at the lower edge of the pipe opening of the overflow pipe 31 .

[0058] In the step 3), when the temperature sensor 23 detects that the temperature of the water in the chassis is much lower than the lower limit of the temperature to be reached by the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulating liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to open, and the valve of the other heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to close, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is rapidly increased. Temperature increase; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulating liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to close, and the valve of the other heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to open, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is accurately increased.

[0059] In the step 2), the filling pipe 18 fills water into the chassis 1 until the liquid level is flush with the bottom pipe opening of the overflow pipe 31, and the water filling is stopped. In the step 5), when the placement rack 27 is placed in the chassis 1, the liquid level in the chassis 1, which was originally flush with the bottom pipe edge of the overflow pipe 31, rises due to the placement rack 27. When the liquid level rises, the water in the chassis 1 will flow out of the chassis 1 through the overflow pipe 31 again.

[0060] In the step 6), the pasteurization temperature range of the material to be pasteurized is divided into a lower temperature range, an intermediate temperature range and an upper temperature range in order from low to high temperatures; when the water temperature in the chassis 1 detected by the temperature sensor 23 is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range, and returning the water temperature in the chassis 1 to the intermediate temperature range of the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range, and returning the water temperature in the chassis 1 to the intermediate temperature range of the pasteurization temperature range; When the water temperature in the chassis 1 detected by the temperature sensor 23 is in the middle temperature area within the pasteurization temperature range, the heat source flow rate entering the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby avoiding the water temperature in the chassis 1 from being higher than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area within the pasteurization temperature range.

[0061] When the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is greater than or equal to 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is 3 degrees Celsius higher than the lower temperature limit, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is 2 degrees Celsius lower than the upper temperature limit; when the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is less than 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is the sum of the lower temperature limit and 40% of the difference between the upper and lower temperatures, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is the difference between the upper temperature limit and 20% of the difference between the upper and lower temperatures.

[0062] The process used in the pasteurization method of the meat packaged food of this embodiment is as follows: Before placing the material into the chassis 1, the cover A2 and the cover B3 are respectively moved to the two ends of the chassis 1, so that the cover A2 and the cover B3 close the top opening of the chassis 1; then water is injected into the chassis 1 through the liquid adding pipe 18, and the circulation pump 12 is turned on at the same time, so that the water in the chassis 1 can fill the circulation pipeline including the circulation liquid inlet pipe 13 and the circulation liquid return pipe 14. When the circulation pipeline is full of water, the circulation pump 12 is turned off; when the water in the chassis 1 overflows from the overflow pipe 31, the liquid adding pipe 18 stops injecting water into the chassis 1, and the height of the liquid level in the chassis 1 is located at the lower edge of the pipe mouth of the overflow pipe 31; when the temperature sensor 23 detects that the temperature of the water in the chassis is much lower than the temperature to be reached by the material to be pasteurized Within a time limit, the processor controls the circulation pump 12 to start again, and controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulation liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to open, and the valve of another heat source outlet branch pipe 22 connected to the middle part of the side wall of the heat exchange sleeve 19 to close, and then the heat source and the water temperature in the circulation liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulation pump 12, so that the water temperature in the chassis is rapidly increased; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe 22 connected to one end of the circulation liquid inlet pipe 13 flowing into the heat exchange sleeve 19 to close. , the valve of another heat source outlet branch pipe 22 connected to the middle of the side wall of the heat exchange sleeve 19 is opened, and then the heat source and the water temperature in the circulating liquid inlet pipe 13 passing through the heat exchange sleeve 19 are increased through the heat source inlet pipe 20, and the water in the chassis 1 is continuously circulated through the circulating pump 12, so that the water temperature in the chassis is accurately increased; when the temperature sensor 23 detects that the water temperature in the chassis 1 reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, the cover plate A2 is moved to the maximum stroke facing the cover plate B3 or the cover plate B3 is moved to the maximum stroke facing the cover plate A2. At this time, the top of the chassis 1 is open on one side of the spray pipe 6, and the placement rack 27 filled with material trays 28 of each layer from top to bottom to be pasteurized is placed by a hanger. Lift it and put it into the case 1 from the open opening, and make the supporting legs at the bottom of the placement rack 27 correspond to the top surface of the placement block 26, so as to ensure that the placement rack 27 can be stably placed in the case 1, and then separate the lifting fixture of the lifting device from the placement rack 27; in the process of placing the placement rack 27 into the case 1, the bottom pipe edge of the case 1 that was originally flush with the overflow pipe 31, the liquid level in the case 1 rises due to the placement of the placement rack 27, and when the liquid level rises, the water in the case 1 will flow out of the case 1 through the overflow pipe 31 again, until the placement rack 27 is placed and fixed in the case 1, at this time, the cover plate A2 and the cover plate B3 are moved to the two ends of the case 1 again, so that the cover plate A2 and the cover plate B3 close the top opening of the case 1;When the placement rack 27 is placed in the chassis 1, the materials in the material trays 28 of each layer of the placement rack 27 can be immediately at the pasteurization temperature, and at the same time, the water temperature in the chassis 1 where the placement rack 27 is placed will also be slightly reduced. However, since each spray pipe 6 horizontally sprays the hot water heated by the heat exchange sleeve 19 to the materials of each layer of the material trays 28 of the placement rack 27, and the sprayed hot water passes through the materials of the corresponding side material trays 28 and then enters the return liquid tank 8 on the corresponding side of the chassis 1 through the return liquid hole 9, and then enters the circulation return liquid pipe 14 through the return liquid branch pipe 15, and finally enters the circulation liquid inlet pipe 13 again through the circulation pump 12, and passes through the heat exchange sleeve 19 again to heat the water in the circulation liquid inlet pipe 13. After being heated, the water in the circulation liquid inlet pipe 13 enters the spray pipe 6 again, and is sprayed to the materials of the corresponding layer of the material tray 28 through the spray pipe 6 again, so that the water temperature around the material is still within the pasteurization temperature range. When the water temperature in the chassis 1 detected by the temperature sensor 23 is in the pasteurization temperature range close to the lower limit temperature area, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being lower than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area of ​​the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is in the middle temperature area of ​​the pasteurization temperature range, the heat source flow rate of the heat source pipe 20 is reduced to return the heat exchange efficiency of the heat exchange sleeve 19 to the initial state, thereby stabilizing the water temperature in the chassis 1 within the middle temperature area of ​​the pasteurization temperature range; when the water temperature in the chassis 1 detected by the temperature sensor 23 is in the pasteurization temperature range close to the upper limit temperature area, the heat source flow rate of the heat source pipe 20 is increased to improve the heat exchange efficiency of the heat exchange sleeve 19, thereby preventing the water temperature in the chassis 1 from being higher than the pasteurization temperature range and returning the water temperature in the chassis 1 to the middle temperature area of ​​the pasteurization temperature range. When the placement rack 27 has been placed in the chassis 1 for the required time for pasteurization, the cover A2 is moved to the maximum stroke facing the cover B3 or the cover B3 is moved to the maximum stroke facing the cover A2. At this time, the top of the side where the pasteurized placement rack 27 is placed in the chassis 1 is open. The pasteurized placement rack 27 is lifted by the lifting device and lifted away from the chassis 1 from the open part. The placement rack 27 and the materials on the material trays 28 fixed to the placement rack 27 are transferred to the cooling equipment to quickly cool the materials, thereby finally achieving pasteurization of the materials. This facilitates refrigeration and cold chain transportation of materials. ;

[0063] After the placement racks 27 are placed on both sides of the liquid spraying pipe 6 in the chassis 1, the liquid level in the chassis 1 will also increase, causing the water in the chassis 1 to overflow from the overflow pipe 31, and finally the height of the liquid level in the chassis 1 will remain at the lower edge of the pipe mouth of the overflow pipe 31; when the placement rack 27 on one side of the chassis 1 is lifted off the chassis 1, the liquid level in the chassis 1 will drop. When the liquid level in the chassis 1 is stable, the height of the liquid level in the chassis 1 is still higher than the top height of the placement rack 27 placed in the chassis 1.

[0064] A liquid level sensor may also be provided in the chassis 1, and the liquid level sensor is electrically connected to the processor. When the liquid level after the liquid adding pipe 18 fills the chassis 1 with water reaches the liquid level sensor, the liquid adding pipe 18 stops filling the chassis 1 with water. At this time, the amount of water in the chassis 1 can make the liquid level in the chassis 1 lower than or equal to the bottom pipe opening of the overflow pipe 31 after one placement rack 27 is placed and fixed in the chassis 1 or two placement racks 27 are placed and fixed in the chassis 1.

Claims

1. A method for pasteurizing packaged meat food, characterized in that The following steps are involved: 1) Before placing the material into the chassis (1), the cover plate A (2) and the cover plate B (3) are respectively moved to the two ends of the chassis (1), so that the cover plate A (2) and the cover plate B (3) close the top opening of the chassis (1); 2) Then, water is injected into the chassis (1) through the liquid injection pipe (18), and the liquid injection pipe (18) stops injecting water when the amount of water in the chassis (1) satisfies the following conditions: after one placement rack (27) is placed and fixed in the chassis (1), after two placement racks (27) are placed and fixed in the chassis (1), the liquid level in the chassis (1) is lower than or equal to the bottom pipe opening of the overflow pipe (31); 3) the processor controls the circulation pump (12) to start, and increases the temperature of the heat source and the water in the circulation liquid inlet pipe (13) passing through the heat exchange sleeve (19) through the heat source inlet pipe (20), and then heats the water in the casing (1) with the water in the circulation liquid inlet pipe (13) heated by the heat exchange sleeve (19), so that the water temperature in the casing (1) is within the temperature range to be reached by the material to be pasteurized; 4) When the temperature sensor (23) detects that the water temperature in the case (1) reaches the upper limit of the pasteurization temperature range of the material to be pasteurized, the cover plate A (2) is moved to the maximum stroke position facing the cover plate B (3) or the cover plate B (3) is moved to the maximum stroke position facing the cover plate A (2). At this time, the top of the case (1) is open on one side of the liquid spraying pipe (6). The placement rack (27) to be pasteurized and filled with material trays (28) in layers from top to bottom is lifted by a lifting device and placed into the case (1) from the opening, and the supporting legs at the bottom of the placement rack (27) are placed correspondingly on the top surface of the placement block (26) respectively, so as to ensure that the placement rack (27) can be stably placed in the case (1). Then, the lifting tool of the lifting device is separated from the placement rack (27); 5) After the placement rack (27) is placed and fixed in the chassis (1), the cover plate A (2) and the cover plate B (3) are moved to the two ends of the chassis (1) respectively, so that the cover plate A (2) and the cover plate B (3) close the top opening of the chassis (1); 6) The placing rack (27) is placed in the case (1). The materials in the material trays (28) of each layer of the placing rack (27) are immersed in the water in the case (1) and can immediately reach the pasteurization temperature. At the same time, the water temperature in the case (1) of the placing rack (27) is also reduced due to heat exchange with the material trays (28) of each layer of the placing rack (27) and the materials. The hot water heated by the heat exchange sleeve (19) is sprayed horizontally to the materials of the material trays (28) of each layer of the placing rack (27) through each spray pipe (6) and continues to transfer heat. The sprayed hot water passes through the corresponding side material trays (28) and is heated by the heat exchange sleeve (19). The material on the material tray (28) enters the liquid return tank (8) on the corresponding side of the chassis (1) through the liquid return hole (9), then enters the circulating liquid return pipe (14) through the liquid return branch pipe (15), then enters the circulating liquid inlet pipe (13) again through the circulating pump (12), and again passes through the heat exchange sleeve (19) to heat the water in the circulating liquid inlet pipe (13). After being heated, the water in the circulating liquid inlet pipe (13) enters the liquid spray pipe (6) again, and is sprayed toward the material on the corresponding layer of the material tray (28) through the liquid spray pipe (6) again, so that the water temperature around the material is still within the pasteurization temperature range; 7) When the placement rack (27) has been placed in the chassis (1) for a period of time required for pasteurization, the cover plate A (2) is moved to the maximum stroke position facing the cover plate B (3) or the cover plate B (3) is moved to the maximum stroke position facing the cover plate A (2). At this time, the top of the side of the chassis (1) where the pasteurized placement rack (27) is placed is opened. The pasteurized placement rack (27) is lifted by a lifting device and lifted away from the chassis (1) from the opening, and then transferred to a cooling device to quickly cool the placement rack (27) and the materials on the material trays (28) on each layer fixed to the placement rack (27), thereby finally achieving pasteurization of the materials.

2. The pasteurization method of packaged meat food according to claim 1, characterized in that: In the step 2), the circulation pump (12) is turned on at the same time so that the water in the chassis (1) can fill the circulation pipeline including the circulation liquid inlet pipe (13) and the circulation liquid return pipe (14). When the circulation pipeline is full of water, the circulation pump (12) is turned off.

3. The pasteurization method of packaged meat food according to claim 1, characterized in that: In the step 2), after the water in the chassis (1) overflows from the overflow pipe (31), the height of the liquid level in the chassis (1) is located at the lower edge of the pipe opening of the overflow pipe (31).

4. The pasteurization method of packaged meat food according to claim 1, characterized in that: In the step 3), when the temperature sensor (23) detects that the temperature of the water in the chassis is much lower than the lower limit of the temperature to be reached by the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe (22) connected to one end of the circulating liquid inlet pipe (13) flowing into the heat exchange sleeve (19) to open, and the valve of the other heat source outlet branch pipe (22) connected to the middle part of the side wall of the heat exchange sleeve (19) to close, and then the heat source and the water temperature in the circulating liquid inlet pipe (13) passing through the heat exchange sleeve (19) are increased through the heat source inlet pipe (20), and the water in the chassis (1) is continuously circulated through the circulating pump (12), so that the water temperature in the chassis is rapidly increased. temperature; when the temperature sensor (23) detects that the water temperature in the chassis (1) reaches the lower limit of the pasteurization temperature range of the material to be pasteurized, the processor controls the valve of the heat source outlet branch pipe (22) connected to one end of the circulating liquid inlet pipe (13) flowing into the heat exchange sleeve (19) to close, and the valve of the other heat source outlet branch pipe (22) connected to the middle part of the side wall of the heat exchange sleeve (19) to open, and then the heat source and the water temperature in the circulating liquid inlet pipe (13) passing through the heat exchange sleeve (19) are increased through the heat source inlet pipe (20), and the water in the chassis (1) is continuously circulated through the circulating pump (12), so that the water temperature in the chassis is accurately increased.

5. The pasteurization method of packaged meat food according to claim 1, characterized in that: In the step 2), the liquid adding pipe (18) injects water into the chassis (1) until the liquid level is flush with the bottom pipe opening of the overflow pipe (31), and the water injection is stopped. In the step 5), during the process of placing the placement rack (27) into the chassis (1), the liquid level in the chassis (1) which was originally flush with the bottom pipe edge of the overflow pipe (31) rises due to the placement of the placement rack (27). When the liquid level rises, the water in the chassis (1) flows out of the chassis (1) again through the overflow pipe (31).

6. The pasteurization method of packaged meat food according to claim 1, characterized in that: In the step 6), the pasteurization temperature range of the material to be pasteurized is divided into a lower temperature range, an intermediate temperature range and an upper temperature range in order from low to high temperatures; when the water temperature in the chassis (1) detected by the temperature sensor (23) is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe (20) is increased to improve the heat exchange efficiency of the heat exchange sleeve (19), thereby preventing the water temperature in the chassis (1) from being lower than the pasteurization temperature range and returning the water temperature in the chassis (1) to the intermediate temperature range of the pasteurization temperature range; when the water temperature in the chassis (1) detected by the temperature sensor (23) is within the pasteurization temperature range and close to the lower temperature range, the heat source flow rate of the heat source pipe (20) is increased to improve the heat exchange efficiency of the heat exchange sleeve (19), thereby preventing the water temperature in the chassis (1) from being lower than the pasteurization temperature range and returning the water temperature in the chassis (1) to the intermediate temperature range of the pasteurization temperature range; When the temperature of the water in the chassis (1) is in the middle temperature region of the pasteurization temperature range, the heat source flow rate entering the heat source pipe (20) is reduced so that the heat exchange efficiency of the heat exchange sleeve (19) returns to the initial state, thereby stabilizing the water temperature in the chassis (1) within the middle temperature region of the pasteurization temperature range; when the water temperature in the chassis (1) detected by the temperature sensor (23) is in the upper temperature region of the pasteurization temperature range, the heat source flow rate entering the heat source pipe (20) is increased so that the heat exchange efficiency of the heat exchange sleeve (19) is increased, thereby preventing the water temperature in the chassis (1) from being higher than the pasteurization temperature range, and returning the water temperature in the chassis (1) to the middle temperature region of the pasteurization temperature range.

7. The pasteurization method of packaged meat food according to claim 6, characterized in that: When the difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is greater than or equal to 6 degrees Celsius, the boundary temperature value A between the lower limit temperature region and the middle temperature region is 3 degrees Celsius higher than the lower limit temperature value, and the boundary temperature value B between the upper limit temperature region and the middle temperature region is 2 degrees Celsius lower than the upper limit temperature value; When the temperature difference between the upper and lower limits of the pasteurization temperature range of the material to be pasteurized is less than 6 degrees Celsius, the boundary temperature value A between the lower temperature limit area and the middle temperature area is the sum of the lower temperature limit value and 40% of the temperature difference between the upper and lower limits, and the boundary temperature value B between the upper temperature limit area and the middle temperature area is the difference between the upper temperature limit value and 20% of the temperature difference between the upper and lower limits.

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