A high-efficiency heat-preservation soybean milk heating device for yuba intelligent production line and a manufacturing and using method thereof

Abstract

The application discloses a kind of high-efficiency heat preservation soybean milk heating equipment for dried beancurd intelligent production line and manufacturing method for use, heating groove fixed support is installed on equipment support, heating groove is constituted by inner groove body and outer insulating layer covered in the outer portion of inner groove body, the open mouth portion of the top of inner groove body is provided with sunken step, and multiple soybean milk trays are mutually overlapped and closed to cover the open mouth portion of inner groove body by sunken step;Long straight heating pipe is arranged through inner groove body and immersed in the water in the inner cavity of inner groove body below soybean milk tray, and water is heated by heat exchange, so that hot gas is generated after water heating and uniformly heats the bottom of the soybean milk tray;Long straight heating pipe is used instead of traditional multiple bend coil pipe to convey steam, reduce steam flow resistance, avoid leakage and vibration problems caused by water hammer impact at elbow position;Heating groove body is constituted by inner groove body and outer insulating layer with whole structure to form broken bridge heat insulation structure, reduce heat bridge heat loss;It can adapt to the continuous production demand of dried beancurd intelligent production line.

Description

Technical Field

[0001] This invention belongs to the technical field of intelligent food production and processing equipment, and specifically discloses an efficient heat-preserving soy milk heating device for intelligent production line of dried bean curd sticks and its manufacturing and usage method. Background Technology

[0002] In the production of dried bean curd sticks, soybean milk needs to be continuously heated at a constant temperature to form a film on its surface, thus creating dried bean curd sticks. The soybean milk heating equipment is the core unit of the intelligent dried bean curd stick production line. In existing technologies, most devices used for heating soybean milk in intelligent dried bean curd stick production lines employ multi-bend coils to transport high-temperature steam for heating. This high-temperature steam easily produces condensate in the transport pipes, and the condensate at the bends of the multi-bend coils is prone to impact and vibration due to the water hammer effect. This not only causes loosening of coil joints and weld leaks, resulting in high operating noise, but also shortens the service life of the heating coils. Furthermore, the coil-type steam heating structure has many bends in the heat exchange pipeline, leading to high steam flow resistance and limited heat exchange efficiency.

[0003] Furthermore, the existing equipment has a simple tank insulation structure, generally using external insulation cotton wrapping. This insulation cotton is loosely assembled, easily becomes damp and fails, resulting in significant heat loss and high energy consumption. The soy milk carrying trays are mostly simple flat-plate structures with poor sealing between the trays, leading to substantial heat leakage during heating, poor temperature uniformity within the cavity, and the risk of scalding operators and supervisors near the production line, posing a safety hazard. Therefore, there is an urgent need to develop a high-efficiency insulated soy milk heating device with low heat exchange resistance, resistance to water hammer impact, excellent insulation performance, reliable sealing, and adaptability to continuous operation in intelligent tofu skin production lines. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the existing technology, the present invention aims to provide a high-efficiency heat preservation soy milk heating equipment and manufacturing and usage method for intelligent production line of dried bean curd sticks, which reduces steam flow resistance, avoids leakage and vibration problems caused by water hammer impact at the elbow, reduces thermal bridge heat conduction loss, and can adapt to the continuous production needs of intelligent production line of dried bean curd sticks.

[0005] The technical solution adopted in this invention is as follows: The first technical solution provides a high-efficiency heat-preserving soy milk heating device for a smart production line for dried bean curd sticks, including a heating tank, which is fixedly supported and installed on a device bracket; the heating tank includes... The inner tank and the outer insulation layer covering the outside of the inner tank; The inner tank is a box structure with an open top, and the open opening is provided with a recessed step, which is used to limit and support one or more soy milk trays; the space in the inner cavity of the inner tank below the soy milk tray is used to hold water. One or more long straight heating pipes are installed through the inner tank. The heating pipes are immersed in the water to achieve steam transport and heat the water through heat exchange, so that the heated water generates heated water vapor to evenly heat the bottom of the soy milk pan. Multiple soy milk trays are connected to each other to close and cover the open opening of the inner tank.

[0006] In some embodiments, the two ends of the heating tube extend through to the outside of the outer insulation layer, and the multiple heating tubes of the multiple heating tanks are connected in parallel and / or in series to the main steam delivery pipeline.

[0007] In some embodiments, an upper overlapping flange extending outward in a horizontal direction is provided around the opening of the inner tank. The outer insulation layer includes an outer groove, which is a top-opening groove structure adapted to the inner groove. The opening is provided with a lower overlapping flange extending inward in the horizontal direction around the opening. The outer groove is connected to the upper overlapping flange by overlapping and riveting. A heat-insulating silicone gasket is provided between the upper lap flange and the lower lap flange.

[0008] In some embodiments, the inner tank is an integral structure made of food-grade stainless steel material through a one-time stretching forming process. The outer tank is an assembled structure composed of food-grade stainless steel sheets through stamping and riveting processes. The outer tank is provided with several injection holes and venting / pressure relief holes. The space between the outer tank and the inner tank is filled with modified polyurethane, and the modified polyurethane is fixed and bonded into an integral structure through the foaming and solidification process of the modified polyurethane.

[0009] In some embodiments, the device support includes a top frame, which is surrounded by the outer groove body in the space between the outer groove body and the inner groove body. The outer groove body and the inner groove body are both solidified and bonded to the top frame by the modified polyurethane to form an integral structure.

[0010] In some embodiments, a longitudinal bottom rib is fixedly provided at the middle of the outer bottom surface of the inner groove; The top frame is provided with several transverse support beams, and each transverse support beam is provided with a limiting groove in the middle. The inner groove body is limited and locked onto the top frame by the cooperation of the longitudinal bottom rib and the limiting groove. A heat-insulating rubber pad is also provided between the longitudinal bottom rib and the limiting groove.

[0011] In some embodiments, the outer tank includes an outer bottom plate, a front side plate, a rear side plate, a left end plate, and a right end plate. The top ends of the front side plate, the rear side plate, the left end plate, and the right end plate are respectively provided with top flange edges extending inward in the horizontal direction, thereby forming a lower lap flange. The bottom ends of the front side plate, the rear side plate, the left end plate, and the right end plate are respectively provided with bottom flange edges extending inward in the horizontal direction. The front side plate, the rear side plate, the left end plate, and the right end plate are respectively riveted to the inner bottom surface of the outer bottom plate through the bottom flange edges. The left end plate and the right end plate are respectively provided with side flange edges on both sides, and the left end plate and the right end plate are respectively riveted to the inner side surfaces of the front side plate and the rear side plate through the side flange edges.

[0012] In some embodiments, the inner tank is provided with N vertical partitions, where N is a positive integer ≥1, dividing the inner cavity of the inner tank into N+1 heating chambers. A soy milk tray is provided above each heating chamber. Each soy milk tray has a limiting flange extending outward in the horizontal direction around its opening. Each soy milk tray is positioned on the vertical partition and the recessed step by the limiting flange around its opening, thereby sealing and covering the opening of the heating chamber. Alternatively, each of the soy milk trays has horizontally extending limiting flanges on its front and rear sides, and each soy milk tray is positioned on the sunken step by the limiting flanges; one end of each soy milk tray has a first end flange extending horizontally outward, and the other end has a second end flange, the second end flange has a Z-shaped step structure formed by a staggered bending process, and the bottom surface of the Z-shaped step of the second end flange and the top surface of the first end flange are at the same vertical height; multiple soy milk trays are connected end to end by the second end flange and the first end flange to achieve a closed cover of the open opening of the inner tank.

[0013] In some embodiments, the soy milk tray is an integral structure made of food-grade stainless steel through a one-time stretching forming process, and the surface of the soy milk tray is coated with a Teflon coating; the heating tank is equipped with a temperature control device, a soy milk level monitoring device, a soy milk replenishment device, a water level monitoring device, and a water replenishment device.

[0014] The second technical solution provides a method for manufacturing and using a high-efficiency heat-preserving soy milk heating device, used in the production of the high-efficiency heat-preserving soy milk heating device for the intelligent production line of dried bean curd sticks described in the first technical solution above, including the following operating steps: S1, obtain production site parameter information, layout design of soybean milk heating equipment specifications and array parameter scheme, as well as soybean milk pan, equipment support, inner tank of heating tank, outer tank of outer insulation layer and modified polyurethane injection filling parameter information for each section of soybean milk heating equipment; S2, decompose the design of the equipment bracket, soy milk tray, outer tank and inner tank; prepare materials, cut and shape, weld and / or rivet to manufacture the equipment bracket, and fix the top frame to form the equipment bracket through several support legs. Several horizontal support beams are evenly distributed and fixedly connected inside the top frame, and each horizontal support beam is provided with a limiting groove in the middle part. S3, for making soy milk trays; S4, Manufacturing the inner tank; S5, Manufacturing the outer tank body; Deconstructing and designing the outer bottom plate, front side plate, rear side plate, left end plate, and right end plate of the outer tank body; S6, combined alignment connection; S7, infused modified polyurethane; S8, gel curing and molding; complete assembly of the whole machine.

[0015] The beneficial effects of this invention are as follows: A high-efficiency insulated soy milk heating device and its manufacturing and usage method for a smart tofu skin production line are disclosed. The heating tank is fixedly supported and installed on the equipment bracket. The heating tank consists of an inner tank body and an outer insulation layer covering the outside of the inner tank body. A recessed step is set at the open opening at the top of the inner tank body. Multiple soy milk trays are interconnected and the recessed step is used to close and cover the open opening of the inner tank body, which can prevent the leakage of heated water vapor and has a high safety factor. A long straight heating pipe is installed through the inner tank body and immersed in the water body located below the soy milk trays in the inner cavity of the inner tank body. The water is heated by heat exchange, so that the heated water generates hot air to evenly heat the bottom of the soy milk trays. The long straight heating pipe replaces the traditional multi-bend coil for transporting steam, reducing the steam flow resistance and avoiding leakage and vibration problems caused by water hammer impact at the bends. The heating tank body adopts an integral structure of inner tank body and outer insulation layer. The outer insulation layer provides insulation performance, and the insulation is stable and not easily affected by moisture, reducing heat loss and improving energy efficiency. It also forms a thermal break insulation structure to reduce thermal bridge heat conduction loss. It can adapt to the continuous production needs of smart tofu skin production lines. Compared with the prior art, the present invention has the following beneficial effects: 1. This invention involves filling the space between the inner and outer tanks with a foamed thermal insulation layer. The modified polyurethane is foamed and cured on-site, fully filling all irregular gaps in the interlayer. This integrates the inner tank, outer tank, and top frame of the equipment support into a single unit, eliminating the need for numerous external fasteners. The insulation layer has no assembly gaps and is not easily detached, significantly reducing heat loss from the tank and achieving the first stage of energy saving.

[0016] 2. Insulating silicone pads are installed at the flange lap joint and the contact position between the bottom rib and the top frame limiting groove to cut off the thermal bridge formed by direct contact between metal components, reduce heat loss through the bracket and flange, further reduce steam consumption, and achieve multiple energy saving.

[0017] 3. The inner tank is made of food-grade stainless steel in one stretch forming without internal welds, which avoids residue accumulation, facilitates cleaning, and meets the hygiene requirements of food processing; the outer tank adopts a stamping and riveting assembly structure, which is simpler to process and has lower processing costs compared to welding; the interlayer is equipped with injection holes and venting and pressure relief holes, which facilitates on-site foaming construction and makes the process controllable.

[0018] 4. The heating straight tube is immersed in heat exchange, and the water generates heated steam to evenly and indirectly heat the bottom of the soy milk pan. The temperature is gentle and avoids local scorching of the soy milk. The soy milk pan is covered and the inner tank is closed to reduce the leakage of high temperature steam, reduce the risk of scalding, and reduce heat loss.

[0019] 5. The surface of the soy milk tray is coated with Teflon, which makes it difficult for soy milk to adhere and form scale, reducing the difficulty of cleaning and maintenance; the heating straight pipes of multiple heating tanks can be connected in parallel or in series to the steam pipeline, adapting to the multi-tank combination layout of the production line.

[0020] 6. Equipped with a temperature control device, a soy milk level monitoring device, a soy milk replenishment device, a water level monitoring device, and a water replenishment device, it can monitor the temperature, soy milk level, and hot water level and automatically replenish materials and water, reducing manual intervention, avoiding dry burning and overflow failures, stabilizing the quality of tofu skin, and improving the safety of equipment operation. Attached Figure Description

[0021] Figures 1-2 This is a three-dimensional structural diagram of the high-efficiency heat-preserving soy milk heating equipment used in the intelligent production line of dried bean curd sticks according to Embodiment 1 of the present invention; Figures 3-4 This is a schematic diagram of the dispersed three-dimensional structure of the high-efficiency heat-preserving soy milk heating equipment used in the intelligent production line of dried bean curd sticks according to Embodiment 1 of the present invention. Figures 5-6 This is a three-dimensional structural diagram of a set of heating tank modules according to Embodiment 2 of the present invention; Figures 7-8 This is a three-dimensional structural diagram of a high-efficiency heat-preserving soy milk heating device with three sections connected in series for a smart production line of dried bean curd sticks, according to Embodiment 3 of the present invention. Figures 9-10 This is a three-dimensional structural schematic diagram of Embodiment 4 of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the soy milk tray adapted to the high-efficiency heat-preserving soy milk heating equipment used in the intelligent production line of dried bean curd sticks according to the present invention. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only. In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Thus, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0023] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections via an intermediate medium, or internal communication between two components. All technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please refer to Figures 1 to 11 As shown, this invention provides a high-efficiency heat-preserving soy milk heating device and its manufacturing and usage method for a smart production line for dried bean curd sticks. The analysis of existing technical solutions is as follows: In existing technologies, most devices used for heat preservation and heating of soy milk in intelligent production lines for dried bean curd sticks employ multi-bend coils to transport high-temperature steam for heating purposes. For example, the invention patent for the steam heating structure of a bean curd stick machine with patent application number CN201610197894.7, in which high-temperature steam easily produces condensate in the conveying pipes, and the condensate is prone to impact and vibration at the bends of the multi-bend coils due to the water hammer effect. This not only causes loosening of the coil joints and leakage of the welds, resulting in loud noise during equipment operation, but also shortens the service life of the heating coil. Furthermore, the coil-type steam heating structure has many bends in the heat exchange pipeline, resulting in high steam flow resistance and limited heat exchange efficiency. The coil is arranged inside the water tank, and the cleaning is difficult after scale builds up on the outer wall of the coil.

[0026] In addition, the existing equipment has a simple tank insulation structure, which generally uses external insulation cotton. The insulation cotton is loosely assembled, easily gets damp and fails, resulting in large heat loss and high equipment energy consumption.

[0027] Furthermore, most existing soy milk heating tanks are simple single-layer tank structures with direct rigid contact between the tank and the frame. Heat is significantly lost through conduction via the frame, further reducing energy efficiency. The soy milk trays are mostly simple flat-plate structures with poor sealing between the trays. During heating, a large amount of heating vapor (hot air) escapes outwards, resulting in poor temperature uniformity within the cavity. Additionally, the escaping hot air can easily scald operators and inspectors near the production line, posing a safety hazard. Some soy milk trays have substrates that come into direct contact with high-temperature soy milk, making them prone to caramelizing and sticking to the trays, resulting in a large workload for cleaning and maintenance.

[0028] The first technical solution of this invention specifically implements a high-efficiency heat-preserving soy milk heating device for a smart production line of dried bean curd sticks. The main structure adopts the conventional industrial equipment structure form. The heating tank 2 is fixedly supported and installed by the equipment bracket 1. The technical solution of this invention is that the heating tank 2 is composed of an inner tank body 21 and an outer insulation layer 22. The outer insulation layer 22 covers the outside of the inner tank body 21 and provides heat preservation performance through the outer insulation layer. The heat preservation is stable and not easily affected by moisture, reducing heat loss and improving energy saving effect. The inner tank body 21 adopts a top-open tank box structure. The structural features of the inner tank body 21 can be a top-open rectangular tank box structure, a circular tank box structure, an elliptical tank box structure, or any other shape of tank structure.

[0029] The inner cavity of the inner tank 21, located in the space below the soy milk pan, is used to hold water. One or more long straight heating pipes 4 are installed longitudinally from head to tail (from left to right in the diagram) inside the inner tank 21. High-temperature steam or other heat-generating media can be transported through the heating pipes 4. The heating pipes 4 are immersed in the water in the space below the soy milk pan in the inner cavity of the inner tank 21 to achieve steam transport and heat the water through heat exchange. The heated water then generates heated water vapor (hot air) to evenly heat the bottom of the soy milk pan 3. In other words, the water in the space below the soy milk pan in the inner cavity of the inner tank 21 is heated by industrial high-temperature steam through heat exchange with the heating pipes. The water in the inner tank is heated and vaporized, then rises and contacts the bottom surface of the soy milk pan, thereby evenly heating the bottom of the soy milk pan 3. This achieves the purpose of evenly heating the soy milk liquid in the soy milk pan so that a film can be formed evenly to form wet tofu skin. Highly efficient and energy-saving, safe and reliable; the heating tube carries the primary medium, which is the externally supplied heat source, namely industrial high-temperature steam. The water in the inner tank is the secondary medium. The water boils and evaporates to produce heating water vapor used to heat the bottom of the soy milk pan. The heating water vapor is not limited to saturated dry steam, but includes the humid hot steam from boiling water evaporation. The high frequency of the food equipment patent will not be confused with the externally input industrial high-temperature steam.

[0030] Furthermore, both ends of the heating tube 4 extend through to the outside of the outer insulation layer 22. The multiple heating tubes 4 of the multiple heating tanks 32 can be arranged in an array and connected in parallel and / or in series with each other, and then connected to the main steam transmission pipeline. For example, multiple sections of the high-efficiency heat preservation soy milk heating equipment of the present invention for intelligent production line of tofu skin can be connected in series to form a row of heating tanks, and then multiple rows of heating tanks can be arranged in parallel according to the site conditions of the production workshop. The multiple sections of long straight heating tubes of each row of heating tanks are connected in series to form a long row of heating tubes. The multiple rows of heating tubes are then connected in parallel to each other and connected to the main steam transmission pipeline to form a heating tube array. Correspondingly, the high-efficiency heat preservation soy milk heating equipment of the present invention for intelligent production line of tofu skin is also arranged in an array.

[0031] In actual operation, the inner tank 21 can be an integral structure made of food-grade stainless steel through a one-time stretching forming process. This structure is simple, the process is straightforward, and the equipment cost is low. A recessed step 211 is installed at the open end of the inner tank, which can limit and support the placement of the soy milk tray 3. Specifically, one soy milk tray can be installed along the length of the inner tank 21, completely sealing and covering the open end; alternatively, multiple soy milk trays can be evenly distributed along the length of the inner tank 21, overlapping each other to completely seal and cover the open end, achieving a fully enclosed and seamless cover. This reduces the leakage of heated steam, achieving high efficiency and energy saving, while preventing the safety hazards caused by heat leakage. Even if a very small amount of heated steam leaks, the limiting and blocking effect of the recessed step will change the direction of the steam radiating outwards in the horizontal direction, causing it to extend upwards or downwards along the vertical step surface of the recessed step. This prevents the steam from scalding the operator, ensuring a high safety factor.

[0032] The specific structural features and connection relationship between the inner tank 21 and the outer insulation layer 22 are as follows: An upper overlapping flange 212 extending outward in the horizontal direction is provided around the opening of the inner tank 21; the core structure of the outer insulation layer 22 is the outer tank 221, which is configured as a top-opening box structure adapted to the inner tank 21, and a lower overlapping flange 222 extending inward in the horizontal direction is provided around the opening. The outer tank 221 can be connected to the upper overlapping flange 212 by overlapping and riveting the lower overlapping flange 222, forming an integral structure that is stable and reliable; and a thermal insulation silicone pad is provided between the upper overlapping flange 212 and the lower overlapping flange 222, which blocks heat conduction to form a thermal break insulation structure.

[0033] The specific structural features of the outer insulation layer 22 are as follows: The outer tank body 221 adopts an assembly structure composed of food-grade stainless steel sheets through stamping and riveting processes; specifically, it is composed of an outer bottom plate 223, a front side plate 224, a rear side plate 225, a left end plate 226, and a right end plate 227. Bottom flange edges 228 extending inward in the horizontal direction are respectively provided at the bottom ends of the front side plate 224, rear side plate 225, left end plate 226, and right end plate 227, so that the front side plate 224, rear side plate 225, left end plate 226, and right end plate 227 can be riveted and fixed together via the bottom flange edges 228. It is attached to the inner bottom surface of the outer base plate 223; top flange edges extending inward in the horizontal direction are respectively provided at the top of the front side plate 224, rear side plate 225, left end plate 226 and right end plate 227, thereby forming the lower overlapping flange 222; further, side flange edges 229 are respectively provided on both sides of the left end plate 226 and right end plate 227, so that the left end plate 226 and right end plate 227 can be riveted and fixedly connected to the inner side surfaces of the front side plate 224 and rear side plate 225 through the side flange edges 229; thus, the outer tank body 221 is assembled and combined, which has a simple and compact structure, simple process and low cost. Furthermore, several injection holes and venting / pressure relief holes can be evenly distributed on the front side plate 224, rear side plate 225, left end plate 226, and right end plate 227 of the outer tank body. Modified polyurethane material can be injected into the space between the outer tank body and the inner tank body through these injection holes and venting / pressure relief holes. During the equipment manufacturing process, the inner tank body with an integral structure featuring an upper overlapping flange is prepared using a one-time stretching forming process made of food-grade stainless steel. After preparing the outer bottom plate 223, front side plate 224, rear side plate 225, left end plate 226, and right end plate 227 respectively using food-grade stainless steel sheets through cutting, blanking, and stamping forming processes, the front side plate 224, rear side plate 225, left end plate 226, and right end plate 227 are riveted and fixedly connected to the inner bottom surface of the outer bottom plate 223 through the bottom flange edges. Then, the left end plate 226 and right end plate 227 are connected together. 227 is riveted and fixed to the inner sides of the front side plate 224 and the rear side plate 225 through the side flange edges 229 on both sides, and assembled to form the overall structure of the outer tank body; then, a silicone heat insulation pad is laid between the lower overlapping flange at the top of the outer tank body and the upper overlapping flange of the inner tank body, and then the lower overlapping flange at the top of the outer tank body and the upper overlapping flange of the inner tank body are riveted and fixed together; finally, modified polyurethane material is injected into the space between the outer tank body and the inner tank body through the injection hole. The modified polyurethane raw material undergoes foaming expansion and gel curing reaction to form an integrated polyurethane insulation layer. During the foaming and gel curing process of the modified polyurethane, the outer tank body and the inner tank body are fixed and bonded to the whole structure, further forming an integrated thermal break insulation structure. It is lightweight and reliable in strength. Through thermal break insulation, the thermal bridge heat conduction loss is reduced, and the high efficiency and energy-saving heat insulation effect is achieved.After the inner and outer tanks are assembled, modified polyurethane material is injected into the interlayer gap between the outer and inner tanks. During the foaming, expansion, gelation, and curing process of the modified polyurethane material, the foam fills the interlayer gap, forming an integral insulation layer that wraps around the outside of the inner tank after curing. The modified polyurethane foams, gels, and cures in situ inside the interlayer between the outer and inner tanks, ensuring a tight, gapless fit between the foam and the outer wall of the tank, resulting in excellent insulation performance. The one-piece molding reduces assembly gaps and lowers the risk of moisture penetration.

[0034] Furthermore, the equipment support 1 can be adapted and modified according to conventional technical solutions. Specifically, it is composed of a top frame 11 and multiple vertical support legs 12. During the connection process between the outer tank 221 and the inner tank 21, the top frame 11 is also enclosed by the outer tank within the space between the outer and inner tanks. During the foaming, expansion, gelation, and curing process of the modified polyurethane material, both the outer and inner tanks are fixedly bonded to the top frame by the modified polyurethane foaming, expansion, gelation, and curing to form an integral structure. This achieves the fixed support and installation of the heating tank 2 on the equipment support 1 without the need for other auxiliary connection structures, resulting in fewer parts, a simpler process, and lower cost. The key structural details are as follows: A longitudinal bottom rib 213 is fixedly installed in the middle of the outer bottom surface of the inner tank 21; several transverse support beams 112 are evenly distributed and fixedly connected inside the top frame 11, and a limiting groove 113 is set in the middle of each transverse support beam. The inner tank 21 is fixedly mounted on the top frame 11 by the mutual cooperation between the longitudinal bottom rib 213 on the outer side of the bottom surface and the limiting groove 113. A heat-insulating rubber pad is also set between the longitudinal bottom rib and the limiting groove. No auxiliary connecting parts or fixed connection operations are required. The modified polyurethane material is foamed, expanded and gelled to form an integral structure, which also constitutes a thermal break structure, further reducing thermal bridge heat conduction loss and improving energy saving effect. The upper part of the front side plate 224, rear side plate 225, left end plate 226, and right end plate 227 of the outer tank body 221, near the top, is set as an upwardly and inwardly inclined surface. The inclined surface can produce the following functions: 1. Foaming limit and pressure constraint: When the modified polyurethane material foams and expands, the inwardly inclined surface forms an oblique constraint on the foam, counteracting the upward expansion force of the polyurethane, inhibiting the upward movement and overflow of the foam, and preventing the foam material from overflowing from the gaps between the upper and lower folded edges and riveting seams; 2. Guiding assembly: Assembly fastening When assembling the outer tank, the inclined surface acts as a guide, facilitating the alignment of the lower folded edge of the outer tank with the upper folded edge of the inner tank, thus improving assembly tolerance; 3. Drainage, prevention of water accumulation, and prevention of soy milk accumulation: Splashed soy milk residue and cleaning wastewater fall onto the inclined surface, and the liquid is guided inward and downward along the inclined surface, preventing it from accumulating on the top of the side wall of the outer tank or at the riveting joints. This avoids the accumulation of soy milk and wastewater in the riveting gaps; it also prevents the long-term retention of soy milk residue and water, reducing mold, rust, and unsanitary corners, meeting the hygiene requirements of food equipment.

[0035] Large round holes are provided on the left end plate 226 and right end plate 227 of the outer tank 221 and on both end plates of the inner tank, through which heating pipes can be installed; small round holes are also provided on the left end plate 226 of the outer tank 221 and on both end plates of the inner tank, through which water inlet pipes can be installed to replenish water to the inner tank; a drain outlet connected to a drain valve pipe is provided on the bottom plate at the lower right corner of the inner tank for easy cleaning of the inner tank; first clearance slots are provided on the front edge of the outer bottom plate 223 of the outer tank 221 at positions corresponding to the support legs 12 of the equipment bracket. 2231, so that the support feet 12 can extend and support the ground during assembly; in actual operation, the bottom width of the inner tank 21 is smaller than the inner frame width of the top frame of the equipment bracket. When the top frame of the equipment bracket is fitted onto the top frame of the equipment bracket through the cooperation of the longitudinal bottom ribs 213 on the outer side of the bottom surface and the limiting grooves 113 of the transverse support beam, the front side of the inner tank is in close contact with the front inner frame surface of the top frame, or it can be at a distance from the front inner frame surface of the top frame; the rear side of the inner tank is located inside the rear inner frame surface of the top frame, and the distance between the rear side of the inner tank and the rear inner frame surface of the top frame is... The width of the outer groove 221 is greater than or equal to the width of the top frame, so that when the outer groove 221 and the inner groove 21 are assembled and connected, the rear side plate 225 of the outer groove 221 can be set inside the rear inner frame surface of the top frame; and second clearance slots 2251 are respectively provided at the lower end of the rear side plate 225 of the outer groove 221 and at the corresponding positions of several transverse support beams 112 inside the top frame, so that the rear side plate 225 can be assembled with the transverse support beams of the top frame through the second clearance slots 2251 during the assembly process, and the outer side of the rear side plate 225 of the outer groove 221 is in close contact with the rear inner frame surface of the top frame. When both the outer and inner tanks are made of modified polyurethane foam that expands and gels to solidify and adhere to the top frame to form an integral structure, there is no need to surround and cover the rear side frame of the top frame. The structure is simple, compact, stable, and reliable, while minimizing volume, reducing equipment space occupation, and improving the space utilization of the production site. The front side panel 224 is tightly attached to the front outer frame surface of the top frame. The left end panel 226 and the right end panel 227 are tightly attached to the outer end surfaces of both ends of the top frame. The outer sides of both ends of the inner tank can be tightly attached to the inner end surface of the top frame or at a distance from the inner end surface of the top frame.

[0036] This invention provides a high-efficiency heat-preserving soy milk heating device for an intelligent production line of dried bean curd sticks. The heating tank 2 is equipped with a temperature control device, a soy milk level monitoring device, a soy milk replenishment device, a water level monitoring device, and a water replenishment device. The temperature control device collects real-time temperature signals of the heat exchange water in the inner tank and the soy milk in the soy milk pan, and works in conjunction with the steam input pipeline to achieve temperature regulation, stabilizing the heat exchange water within the process-set temperature range and ensuring a stable output temperature of the heating steam. The soy milk level monitoring device is distributed around the soy milk pan, detecting and collecting the soy milk level signal in real time. The soy milk replenishment device's outlet pipe 5, as shown in the figure, connects to the soy milk pan and can automatically replenish soy milk into the pan based on the level signal fed back by the soy milk level monitoring device, maintaining a stable soy milk level in the pan. A water level monitoring device is installed inside the inner tank to detect the water level of the heat exchange water within the tank. The water replenishment device's inlet pipe connects to the inner tank. When the water level drops due to vaporization, the replenishment device receives a signal and replenishes water to the inner tank, ensuring the water level remains within the set range and guaranteeing stable steam generation. The specific structures of the temperature control device, soy milk level monitoring device, soy milk replenishment device, water level monitoring device, and water replenishment device can all be adapted using conventional technologies. This invention does not cover these aspects and therefore they are not shown in the accompanying drawings.

[0037] The soy milk tray is made of food-grade stainless steel through a one-time stretching process, and the surface of the soy milk tray is coated with Teflon, which has the characteristics of high temperature resistance, non-stick and corrosion resistance. It can effectively prevent the soy milk from charring and sticking during the heating process, and greatly reduce the difficulty of cleaning and maintaining the equipment.

[0038] The soy milk tray configuration of this invention has two adaptable installation structures, which can be flexibly selected according to the production line specifications. The first embodiment: N vertical partitions are set inside the inner tank 21, where N is a positive integer greater than or equal to 1. The vertical partitions divide the inner tank cavity into N+1 independent heating chambers, and a soy milk tray is independently placed above each heating chamber. The soy milk tray can adopt a conventional square or rectangular tray structure, and the specific switch of the soy milk tray can be set according to the specific shape of the heating tank. A horizontally extending limiting flange is set around the opening of each soy milk tray. The soy milk tray is limited and overlapped on the top of the vertical partition and the recessed step by the limiting flange, completely sealing and covering the opening of each heating chamber. Each heating chamber has independent temperature control and does not interfere with each other, resulting in better heating uniformity. This implementation method eliminates the need to distinguish the directionality of the soy milk tray, simplifying the production process and making operation convenient. However, it requires the addition of multiple vertical partitions, which only separate the lower water space. There is an assembly gap between the upper part of the partition and the soy milk tray, creating unsanitary dead corners at the contact points between the vertical partition and the bottom and side walls of the inner tank. The upper edge of the partition overlaps with the soy milk tray, resulting in narrow gaps. Residual soy milk and scale from splashed production can easily accumulate in the overlap gaps and welds, making them difficult to clean. Under food production conditions, this can easily lead to mold growth, failing to meet the hygiene requirements of food equipment. The accompanying drawings of this invention show the vertical partitions, which can be specifically referred to as the partition structure in a traditional soy milk heating tank.

[0039] The second implementation method: The inner tank 21 does not have vertical partitions. Instead, horizontally extending limiting flanges are provided on the front and rear sides of each soy milk pan 3. These limiting flanges are used to limit the pan's placement on the recessed step 211. A first end flange 31 is provided at one end of each soy milk pan 3, and a second end flange 32 is provided at the other end. The second end flange 32 is a Z-shaped step structure, which is formed by staggered bending of sheet metal. The bottom surface of the Z-shaped step is at the same vertical height as the top surface of the first end flange 31. Multiple soy milk pans 3 are connected end to end, and adjacent soy milk pans are sealed by the first end flange 31 and the second end flange 32. This completely seals and covers the open opening of the inner tank, effectively preventing a large amount of internal heating steam from leaking out. This avoids the hot steam from spraying out and scalding nearby operators, significantly improving the safety of the equipment operation. The first and second end flanges are integrally formed by staggered bending of sheet metal, and the overlapping mating surfaces are leveled after bending. The height tolerance between the bottom surface of the Z-shaped step and the top surface of the first end flange of the same soy milk tray is controlled within ±0.3mm. This ensures that adjacent flanges can overlap smoothly when multiple trays are assembled without height mismatch or warping. The flatness of the top surface of the first end flange and the overlapping bottom surface of the Z-shaped step of the second end flange is ≤0.2mm. This ensures surface contact during overlapping, reduces the mating gap, and suppresses leakage of heating steam from the overlapping gap. The parallelism of the top surface of the first end flange and the bottom surface of the Z-shaped step relative to the reference plane of the soy milk tray is ≤0.25mm. This prevents the flange surface from tilting and causing excessive local gaps. The coplanarity of the limiting folded edges on the front and rear sides of the soy milk tray is ≤0.3mm. This ensures that the soy milk tray is placed stably on the sunken step, the soy milk tray as a whole does not tilt, and the overlapping alignment of the two end flanges is accurate. After assembly, the bottom surface of the Z-shaped step of the second flange of the next soy milk tray is pressed against the top surface of the first flange of the previous soy milk tray, forming an overlapping and sealing structure. Relying on the flange mating surface after precision bending and leveling, the splicing gap between adjacent soy milk trays is greatly reduced, reducing the leakage of internal heating water vapor and avoiding the safety hazard of scalding operators. At the same time, this overlap is a non-welded and detachable structure, and each soy milk tray can be pulled out individually for easy cleaning and maintenance.

[0040] This invention features a compact overall structure, excellent thermal insulation performance, and high heat exchange efficiency. It completely solves the defects of traditional coil heating, such as water hammer vibration, high noise, easy leakage, high energy consumption, poor sealing, water vapor leakage causing scalding, excessive manual intervention, and poor hygiene. It has a high degree of automation, safe and stable operation, and can perfectly adapt to the continuous, large-scale, and standardized production operation requirements of intelligent tofu skin production lines.

[0041] The second technical solution specifically implements a method for manufacturing and using a high-efficiency heat-preserving soy milk heating device, used in the production of the high-efficiency heat-preserving soy milk heating device for the intelligent production line of dried bean curd sticks mentioned in the first technical solution above, and is carried out according to the following operating steps: S1, obtain production site parameter information, layout design of soybean milk heating equipment specifications and array parameter scheme, as well as soybean milk pan, equipment support, inner tank of heating tank, outer tank of outer insulation layer and modified polyurethane injection filling parameter information for each section of soybean milk heating equipment; S2, decompose the design of the equipment bracket, soy milk tray, outer tank and inner tank; prepare materials, cut and shape, weld and / or rivet to manufacture the equipment bracket, and fix the top frame to form the equipment bracket through several support legs. Several horizontal support beams are evenly distributed and fixedly connected inside the top frame, and each horizontal support beam is provided with a limiting groove in the middle part. S3, Manufacturing a soy milk tray; Select food-grade 304 stainless steel sheet for blanking, and form an open-top, trough-shaped soy milk tray through deep drawing in one piece; Integrate the limiting flanges extending outward in the horizontal direction on both sides of the open opening, as well as the first and second end flanges on the left and right sides; Level the overlapping working surfaces such as the top surface of the first end flange and the bottom surface of the Z-shaped step; Remove burrs and polish; After degreasing and cleaning, spray a food-grade Teflon coating on the surface of the soy milk tray and cure it at high temperature to obtain a soy milk tray with non-stick and corrosion-resistant properties; S4, Manufacturing the inner tank: Select food-grade 304 stainless steel sheet for blanking, and form an open-top, box-shaped inner tank and longitudinal bottom ribs through deep drawing in one piece. Integrate the upper lap flange and lower step at the opening of the inner tank. Machin the opening position of the inner tank to form assembly through holes for the heating tube assembly, remove burrs and polish. Weld and fix the longitudinal bottom ribs to the middle of the outer bottom surface of the inner tank. S5, manufacture the outer tank body; decompose the design of the outer bottom plate, front side plate, rear side plate, left end plate, and right end plate of the outer tank body, select food-grade 304 stainless steel sheet, and perform blanking, stamping and bending processing according to the outer bottom plate, front side plate, rear side plate, left end plate, and right end plate; respectively form the top flange edge, bottom flange edge, side flange edge, filling hole and venting and pressure relief hole, as well as the inclined surface of the upper part of the front side plate, rear side plate, left end plate, and right end plate that slopes upward and inward near the top; S6, combined alignment connection; S61, The equipment bracket is pre-placed and supported on the ground of the production site according to the layout design scheme; S62, the inner tank is secured to the transverse support beam inside the top frame of the equipment bracket by the mutual limiting of the longitudinal bottom rib and the limiting groove, and a heat-insulating silicone pad is set between the longitudinal bottom rib and the limiting groove. The distance between the rear side of the inner tank and the rear inner frame of the top frame is equal to the frame edge width of the top frame. S63, the front side plate, rear side plate, left end plate and right end plate of the outer tank are riveted and fixed to the upper overlapping flange of the inner tank through the top flange edge, and a heat insulation silicone pad is also set between the top flange edge and the upper overlapping flange; and the rear side plate is inserted into the top frame through the second clearance slot and the transverse support beam inside the top frame, and the outer side of the rear side plate is in close contact with the rear inner frame surface of the top frame to prevent the presence of sanitary dead corners in the gap; S64, the outer bottom plate of the outer tank body is riveted and fixedly connected to the bottom flange edges of the front side plate, rear side plate, left end plate, and right end plate; S7, infused modified polyurethane; Liquid modified polyurethane material is quantitatively injected into the interlayer space between the inner and outer tanks through the injection holes and venting / pressure relief holes reserved on the outer tank plate. After injection, the injection holes and venting / pressure relief holes are sealed. The liquid modified polyurethane material undergoes a foaming reaction inside the sealed interlayer space, and the material continues to foam and expand, fully filling the entire interlayer space between the outer wall of the inner tank, the inner wall of the outer tank, and the top frame of the equipment support. During the foaming process, the inward inclined surface of the upper part of the outer tank forms an oblique constraint on the upward-moving foam, counteracting the upward expansion force of the foam, inhibiting the foam material from overflowing outward from the flange riveting gap, and at the same time absorbing the expansion stress generated by foaming, protecting the riveting connection from peeling damage. S8, gel curing molding; After foaming, the modified polyurethane gradually undergoes a gel curing reaction to form a rigid closed-cell polyurethane insulation layer. The cured modified polyurethane insulation layer firmly covers and bonds the outer wall of the inner tank, the top frame of the equipment support, and the inner wall of the outer tank into one integrated structure, forming an integrated outer insulation layer sandwich structure. After curing, the heating tube assembly, soy milk tray, temperature control device, liquid level monitoring and replenishment devices, and all related components are assembled to complete the assembly of the whole machine.

[0042] This invention relates to a high-efficiency heat-insulating soy milk heating device and its manufacturing and usage method for an intelligent tofu skin production line. The heating tank is fixedly supported and installed on a device bracket. The heating tank consists of an inner tank body and an outer insulation layer covering the outside of the inner tank body. A recessed step is provided at the open top of the inner tank body, and multiple soy milk trays overlap and are sealed off by the recessed step. A long, straight heating pipe is installed through the inner tank body and immersed in water located below the soy milk trays within the inner tank cavity. Heat exchange heats the water, generating hot steam that evenly heats the bottom of the soy milk trays. The use of a long, straight heating pipe replaces the traditional multi-bend coil for steam delivery, reducing steam flow resistance and avoiding leakage and vibration problems caused by water hammer impact at bends. The heating tank body adopts an integral structure of the inner tank body and outer insulation layer. The outer insulation layer provides insulation performance, ensuring stable insulation and preventing moisture absorption, reducing heat loss and improving energy efficiency. It also forms a thermal break structure, reducing thermal bridge heat conduction loss. This design is suitable for the continuous production needs of an intelligent tofu skin production line.

[0043] Example 1: Example 1 Figures 1-4 As shown, a high-efficiency heat-preserving soy milk heating device for a smart tofu skin production line is implemented according to the above-mentioned planning and technical scheme.

[0044] The heating tank 2 is fixedly supported by the equipment bracket 1. The outer insulation layer 22 of the heating tank 2 covers the outside of the inner tank 21. Both the inner tank 21 and the outer tank 221 of the outer insulation layer 22 adopt a rectangular tank structure. Six soy milk trays are arranged in a recessed step at the open opening of the inner tank. Figure 11 As shown, each soy milk pan 3 has horizontally extending limiting flanges 30 on both the front and rear sides, which limit the pan to rest on the sunken step 211. Each soy milk pan 3 has a first end flange 31 at one end and a second end flange 32 at the other end, which is a Z-shaped step structure. The six soy milk pans 3 overlap each other end to end, and adjacent soy milk pans are sealed by the first end flange 31 and the second end flange 32, which together cover the open opening of the inner tank. Each soy milk pan also has an upwardly protruding handle 33 in the middle of the first end flange 31 and the second end flange 32, which facilitates the removal of the soy milk pan for transfer or cleaning.

[0045] Water is filled in the space below the soy milk pan within the inner cavity of the inner tank 21. A long, straight heating pipe 4 runs through the inner tank and the outer insulation layer in a left-right direction. One end of the heating pipe is connected to an industrial high-temperature steam pipeline, and the other end can be connected to the heating pipe of an adjacent section of soy milk heating equipment in the production area. The heating pipes of all soy milk heating equipment in the production area are connected in series and / or in parallel to form a connected heating network. After the industrial high-humidity steam, as the heat source, is delivered into the heating network, it flows and heats all the soy milk heating equipment in sequence. After the production area is started, even if soy milk has not yet been poured into the soy milk pan or the process of peeling the bean curd skin has not yet officially started, the industrial high-humidity steam can be delivered through the heating network to preheat the water medium in all the heating tanks. The temperature of all the heating tanks and the liquid in the soy milk pan is controlled by a temperature control device. Preheating and efficient insulation measures can improve production efficiency without wasting thermal energy.

[0046] Example 2: Example 2 Figures 5-6 As shown, based on the above embodiment one, two heating devices are set up back to back to form a heating tank module. The heating pipes of the two heating devices are connected in parallel to the main industrial high-temperature steam transmission pipeline. The industrial high-temperature steam supplies heat to the two soy milk heating devices simultaneously through the parallel heating pipes. A suspension rod 6 is set in the middle part above the heating tank of each heating device. An operator can circulate around the heating tank module to peel off the wet bean curd skin that has solidified into a film in the soy milk pan and hang it on the suspension rod.

[0047] Example 3: Example 3 Figures 7-8 As shown, based on the above embodiment one, three high-efficiency heat preservation soy milk heating devices for the intelligent production line of dried bean curd are connected in series. The long straight heating pipes of the three soy milk heating devices are connected in series to form a continuous pipe group extending in a straight direction. The continuous pipe group is directly connected to the main industrial high-temperature steam transmission pipeline without any bends. The high-temperature steam is transported in a straight line along the continuous pipe group, reducing the steam flow resistance and avoiding leakage and vibration problems caused by water hammer impact at bends.

[0048] Example 4: Example 4 Figures 9-10 As shown, based on the above embodiment three, a total of six sections of soy milk heating equipment are set up. Every three sections of soy milk heating equipment are connected in series to form a row of heating tanks. The six sections of soy milk heating equipment are divided into two rows of heating tanks arranged opposite each other. The space between the two rows of heating tanks forms a passageway that allows the peeling robot to move and walk. Auxiliary devices such as guide rails and sliding contact lines can be installed on the lower inner side of the equipment support of the heating tank group. The guide rails can provide movement guidance for the peeling robot, and the sliding contact lines can provide power energy to the peeling robot.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency heat-preserving soy milk heating device for a smart production line of dried bean curd sticks, characterized in that, It includes a heating tank, which is fixedly supported and mounted on a device bracket; the heating tank includes... The inner tank and the outer insulation layer covering the outside of the inner tank; The inner tank is a box structure with an open top, and the open opening is provided with a recessed step, which is used to limit and support one or more soy milk trays; the space in the inner cavity of the inner tank below the soy milk tray is used to hold water. One or more long straight heating pipes are installed through the inner tank. The heating pipes are immersed in the water to achieve steam transport and heat the water through heat exchange, so that the heated water generates heated water vapor to evenly heat the bottom of the soy milk pan. Multiple soy milk trays are connected to each other to close and cover the open opening of the inner tank.

2. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 1, characterized in that: Both ends of the heating tube extend through to the outside of the outer insulation layer, and multiple heating tubes of the multiple heating tanks are connected in parallel and / or in series to the main steam delivery pipeline.

3. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 1, characterized in that: The opening of the inner tank is provided with an upper overlapping flange that extends outward in a horizontal direction. The outer insulation layer includes an outer groove, which is a top-opening groove structure adapted to the inner groove. The opening is provided with a lower overlapping flange extending inward in the horizontal direction around the opening. The outer groove is connected to the upper overlapping flange by overlapping and riveting. A heat-insulating silicone gasket is provided between the upper lap flange and the lower lap flange.

4. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 3, characterized in that: The inner tank is an integral structure made of food-grade stainless steel material through a one-time stretching and forming process. The outer tank is an assembled structure composed of food-grade stainless steel sheets through stamping and riveting processes. The outer tank is provided with several injection holes and venting / pressure relief holes. The space between the outer tank and the inner tank is filled with modified polyurethane, and the modified polyurethane is fixed and bonded into an integral structure through the foaming and solidification process of the modified polyurethane.

5. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 4, characterized in that: The equipment support includes a top frame, which is surrounded by the outer tank body in the space between the outer tank body and the inner tank body. The outer tank body and the inner tank body are both solidified and bonded to the top frame by the modified polyurethane to form an integral structure.

6. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 5, characterized in that: A longitudinal bottom rib is fixedly provided in the middle of the outer bottom surface of the inner groove; The top frame is provided with several transverse support beams, and each transverse support beam is provided with a limiting groove in the middle. The inner groove body is limited and locked onto the top frame by the cooperation of the longitudinal bottom rib and the limiting groove. A heat-insulating rubber pad is also provided between the longitudinal bottom rib and the limiting groove.

7. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 4, characterized in that: The outer tank includes an outer bottom plate, a front side plate, a rear side plate, a left end plate, and a right end plate. The top ends of the front side plate, the rear side plate, the left end plate, and the right end plate are respectively provided with top flange edges extending inward in the horizontal direction, thereby forming a lower lap flange. The bottom ends of the front side plate, the rear side plate, the left end plate, and the right end plate are respectively provided with bottom flange edges extending inward in the horizontal direction. The front side plate, the rear side plate, the left end plate, and the right end plate are respectively riveted to the inner bottom surface of the outer bottom plate through the bottom flange edges. The left end plate and the right end plate are respectively provided with side flange edges on both sides, and the left end plate and the right end plate are respectively riveted to the inner side surfaces of the front side plate and the rear side plate through the side flange edges.

8. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 1, characterized in that: The inner tank is provided with N vertical partitions, where N is a positive integer ≥1, which divide the inner cavity of the inner tank into N+1 heating chambers. A soy milk tray is provided above each heating chamber. Each soy milk tray has a limiting flange extending outward in the horizontal direction around its opening. Each soy milk tray is positioned on the vertical partition and the recessed step by the limiting flange around its opening, thereby sealing and covering the opening of the heating chamber. Alternatively, each of the soy milk trays has horizontally extending limiting flanges on its front and rear sides, and each soy milk tray is positioned on the sunken step by the limiting flanges; one end of each soy milk tray has a first end flange extending horizontally outward, and the other end has a second end flange, the second end flange has a Z-shaped step structure formed by a staggered bending process, and the bottom surface of the Z-shaped step of the second end flange and the top surface of the first end flange are at the same vertical height; multiple soy milk trays are connected end to end by the second end flange and the first end flange to achieve a closed cover of the open opening of the inner tank.

9. The high-efficiency heat-preserving soy milk heating equipment for intelligent production line of dried bean curd sticks according to claim 1, characterized in that: The soy milk tray is an integral structure made of food-grade stainless steel material through a one-time stretching and forming process, and the surface of the soy milk tray is coated with Teflon coating. The heating tank is equipped with a temperature control device, a soy milk level monitoring device, a soy milk replenishment device, a water level monitoring device, and a water replenishment device.

10. A method for manufacturing and using a high-efficiency heat-preserving soy milk heating device, characterized in that: The high-efficiency heat-preserving soy milk heating equipment for intelligent production lines of dried bean curd sticks, as described in any one of claims 1 to 8, includes the following operating steps: S1, obtain production site parameter information, layout design of soybean milk heating equipment specifications and array parameter scheme, as well as soybean milk pan, equipment support, inner tank of heating tank, outer tank of outer insulation layer and modified polyurethane injection filling parameter information for each section of soybean milk heating equipment; S2, decompose the design of the equipment bracket, soy milk tray, outer tank and inner tank; prepare materials, cut and shape, weld and / or rivet to manufacture the equipment bracket, and fix the top frame to form the equipment bracket through several support legs. Several horizontal support beams are evenly distributed and fixedly connected inside the top frame, and each horizontal support beam is provided with a limiting groove in the middle part. S3, for making soy milk trays; S4, Manufacturing the inner tank; S5, Manufacturing the outer tank body; S6, combined alignment connection; S7, infused modified polyurethane; S8, gel curing and molding; complete assembly of the whole machine.

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