A fractional temperature swing concentration device

Abstract

The application discloses a kind of hierarchical temperature concentration device, and the application relates to food processing technical field.The hierarchical temperature concentration device, using 360 ° full package water bath heating structure makes the cylinder wall of heating cylinder immerse in constant temperature water bath environment, the real-time temperature difference of heating wall surface and material main body is small, whole course has no local high temperature heating surface, even if high viscosity material forms wall layer after concentration late, its temperature is far below the coking threshold of reducing sugar, pectin, eliminates the problem that material long-term contact high temperature wall surface leads to pasting coking, avoids the defect that finished product produces bitter taste, appears irreversible color browning, simultaneously eliminates the food safety risk that coking material falls off, simultaneously according to the rheological property change rule of pomelo extract liquid from low viscosity stock solution to high consistency paste, innovative adoption three-stage hierarchical temperature concentration process, respectively match pre-concentration low temperature rapid dehydration, main concentration medium temperature steady thickening, collect paste stage low temperature stable quality forming.

Description

Technical Field

[0001] This invention relates to the field of food processing technology, specifically to a graded temperature-controlled concentration device. Background Technology

[0002] The graded temperature-varying concentration device for pomelo paste production is a food processing equipment designed for the characteristics of pomelo extract (high sugar content, high pectin content, rich in heat-sensitive flavonoids / vitamins / amino acids, and exponential increase in viscosity during concentration). Based on the solids content and viscosity-rheological characteristics of the material during concentration, the device divides the concentration process into multiple continuous / intermittent gradient stages. Each stage is matched with a specific heating temperature and material residence time. By progressively lowering the evaporation boiling point and precisely controlling the dehydration rate, the device achieves the concentration of pomelo extract from a low-solids stock solution to a high-viscosity paste while maximizing the retention of heat-sensitive active ingredients and ensuring batch-to-batch product quality consistency.

[0003] Regarding the aforementioned technologies, it is believed that the current industry practice of concentrating pomelo paste generally adopts a boiling process, in which the pomelo juice to be concentrated is directly put into a heating tank, and the juice is continuously heated while the water evaporates. The solid content of the juice gradually increases and the viscosity increases, eventually producing a finished pomelo paste product that meets the consistency requirements. In order to alleviate the problem of scorching of viscous materials during the heating process, it is also necessary to arrange operators to carry out continuous manual stirring and scraping of the tank wall throughout the boiling process. In the later stages of concentration, the solid content of the fruit juice increases and the fluidity decreases significantly, which easily forms a static retention layer on the inner wall of the heating tank. After long-term contact with the high-temperature heating surface, gelatinization and coking will occur. This will not only cause the finished product to have a burnt and bitter taste and irreversible browning, but also greatly reduce the sensory quality and commercial value of the pomelo paste. The falling off of the coking material will also bring serious food safety risks and make it difficult to adapt to the changes in rheological properties throughout the entire concentration cycle of pomelo fruit juice. The purpose of this invention is to provide a graded temperature-varying concentration device for the production of pomelo paste, which solves the problems of easy gelatinization and coking of materials, deterioration of sensory and nutritional quality of finished products, and other technical issues existing in the concentration process of pomelo paste. Summary of the Invention

[0004] The purpose of this invention is to provide a staged temperature-varying concentration device that solves the problems mentioned in the background art.

[0005] To achieve this objective, the present invention adopts the following technical solution: A graded temperature-controlled concentration device includes a placement platform and an arc-shaped positioning frame installed on the top of the placement platform. A temperature control mechanism is installed on the top wall of the placement platform for graded temperature-controlled concentration of pomelo extract. A vertical frame is provided at the rear of the top wall of the placement platform. A sealing cover is installed on the top wall of the vertical frame through a control component. A temperature measuring mechanism is provided on the top of the sealing cover. A hoisting mechanism is provided on the top wall of the vertical frame. A control console is provided at the front of the placement platform. The temperature control mechanism includes an adjustable electric heating plate installed on the top of the placement platform. The electric heating plate is electrically connected to the control console and can control the heating temperature of the electric heating plate. A water bath is installed on the top of the electric heating plate and inside the arc-shaped positioning frame for holding water and heating it in stages to achieve water bath heating. A support frame is placed inside the water bath. A heating cylinder is placed inside the water bath and on top of the support frame for holding pomelo extract. A sealing ring is installed on the top of the water bath to seal the area around the heating cylinder and reduce heat dissipation. A high-temperature resistant filter screen is installed inside the heating cylinder to separate the fruit residue in the pomelo extract.

[0006] Furthermore, the sealing cap is located at the top of the heating cylinder and is of compatible specifications. The temperature measuring mechanism includes an exhaust pipe installed on the top of the sealing cap. The exhaust pipe passes through the sealing cap and is connected to the heating cylinder. A lifting seat is fitted onto the outer wall of the exhaust pipe. After being lifted by air pressure, the exhaust pipe lifts up and discharges the steam inside the heating cylinder. A plug-in seat is provided on the top of the sealing cap. A temperature measuring instrument is plugged into the plug-in seat to measure the concentration temperature of the pomelo extract at different stages inside the heating cylinder.

[0007] Furthermore, the control component includes a mounting base fixedly installed on the top of the frame. A geared motor is provided on the outer wall of the mounting base. A transmission shaft is fixedly installed through the power shaft of the geared motor through the mounting base. A support seat is provided on the top wall of the frame at the position corresponding to the transmission shaft. The front end of the transmission shaft passes through the support seat through a bearing and extends to the outside to be fixedly connected to the hoisting mechanism.

[0008] Furthermore, a helical gear one is fixedly installed on the outer wall of the drive shaft, a screw cylinder is rotatably installed inside the upright frame, a helical gear two that meshes with the helical gear one is fixedly installed on the outer wall of the screw cylinder, an adjusting screw is screwed inside the screw cylinder, a limit seat is fixedly installed at the top of the adjusting screw, a bent part is rotatably installed at the bottom of the adjusting screw, and the bottom end of the bent part is fixedly connected to the top of the sealing cover.

[0009] Furthermore, a lifting frame is provided on the top wall of the sealing cover and at a position corresponding to the top of the sealing cover. A positioning telescopic rod is provided between the lifting frame and the upright frame. The fixed end of the positioning telescopic rod is fixedly connected to the inner top wall of the upright frame, and the movable end of the positioning telescopic rod is fixedly connected to the top wall of the lifting frame.

[0010] Furthermore, the geared motor controls the meshing transmission of helical gear one and helical gear two through the drive transmission shaft, and drives the hoisting mechanism to start the hoisting operation simultaneously. While the helical gear two drives the screw barrel to rotate inside the frame, it causes the adjusting screw to be raised and lowered, thereby causing the bent part and the sealing cover to quickly disengage from the sealing contact state with the heating cylinder. While the sealing cover is raised and lowered, the positioning telescopic rod retracts to limit the path and prevent deviation during subsequent reset.

[0011] Furthermore, the hoisting mechanism includes a U-shaped platform fixedly installed on the top wall of the support frame. A drive shaft is rotatably installed on the inner wall of the U-shaped platform. A bevel gear one is fixedly installed on the outer wall of the drive shaft. The bevel gear one is meshed with a bevel gear two. The bevel gear two is fixedly connected to the transmission shaft.

[0012] Furthermore, when the drive shaft rotates under force, it will control the drive shaft, bevel gear two, and bevel gear one to form a meshing transmission at the same speed, thereby causing bevel gear one to drive the drive shaft to rotate at the same speed.

[0013] Furthermore, both ends of the drive shaft are fixedly mounted with winding wheels through bearings through the U-shaped platform. The outer wall of the winding wheel is surrounded by a hoisting steel rope, and the bottom end of the hoisting steel rope is fixedly mounted with a hook for hanging on the hanging ring on the outer wall of the heating cylinder.

[0014] Furthermore, as the drive shaft drives the winding wheel to rotate gradually, the hoisting steel rope and hook are controlled to lift the heating cylinder step by step, so that the pomelo extract is concentrated to a suitable concentration, and then the heating cylinder is separated from the inside of the water bath.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This graded temperature-varying concentration device employs a 360° fully enclosed water bath heating structure, immersing the heating cylinder wall in a constant-temperature water bath environment. The real-time temperature difference between the heating wall and the main material is small, eliminating localized high-temperature heating surfaces throughout the process. Even if a high-viscosity material forms a layer adhering to the wall during the later stages of concentration, its temperature remains far below the caramelization threshold of reducing sugars and pectin. This eliminates the gelatinization and coking problems caused by prolonged contact with high-temperature walls, preventing the finished product from developing a burnt, bitter taste and irreversible browning. It also eliminates the food safety risks associated with the shedding of coked material. Furthermore, considering the rheological changes in pomelo extract from low-viscosity stock solution to high-viscosity paste, an innovative three-stage graded temperature-varying concentration process is adopted. This process matches the temperature parameters for pre-concentration (low-temperature rapid dehydration), main concentration (medium-temperature stable thickening), and the final paste stage (low-temperature stabilization and shaping). Combined with a fully closed-loop real-time temperature feedback control, this ensures concentration efficiency at each stage while significantly shortening the total high-temperature exposure time of the material, thereby improving the retention rate of heat-sensitive active ingredients in pomelo.

[0016] 2. This graded temperature-varying concentration device, through fully automated closed-loop temperature control, eliminates the need for manual monitoring of the temperature and judgment of the concentration endpoint based on experience. It can automatically complete the entire process of graded temperature-varying concentration, simultaneously realizing the automatic lifting and locking of the sealing cap, the pre-positioning and lowering of the hoisting mechanism, as well as the automatic opening of the cap and the automated hoisting and lifting of the heating cylinder after concentration. This significantly reduces the production operation threshold and adapts to the needs of large-scale production of small-batch, multi-batch grapefruit paste.

[0017] 3. This graded temperature-varying concentration device, through the precise fitting of the sealing cover and the heating cylinder, forms a fully enclosed evaporation operation space. Combined with the self-balancing directional exhaust structure of the lifting seat, steam is only released in a directional manner when the internal steam pressure exceeds the threshold. This avoids large-area contact between the material and the outside air throughout the process, effectively reducing the oxidation and browning of the material and eliminating the risk of pollutants and microorganisms falling into the material from the environment. At the same time, it greatly reduces the frequency of manual intervention in production and avoids secondary microbial contamination caused by manual operation, which meets the requirements of food production standards and further ensures the food safety of the product.

[0018] 4. This graded temperature-varying concentration device, through the design of the hoisting mechanism, can complete the pre-positioning connection between the hook and the heating cylinder ring during the pre-treatment stage of material loading. After concentration, the automatic opening of the sealing cover and the automated vertical hoisting and lifting of the heating cylinder can be realized simultaneously by the reverse rotation of the reduction motor. The heating cylinder can be lifted to a safe discharge operation height without the need for operators to directly contact the high-temperature cylinder. At the same time, it simplifies the post-discharge processing process and shortens the discharge operation time.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0022] Figure 1 This is a schematic diagram of the external structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the external structure of the present invention. Figure 2 ; Figure 3 This is a combined diagram of the placement platform, control console, arc-shaped positioning frame, and temperature control mechanism of the present invention; Figure 4 This is a combined diagram of the placement platform, control console, and arc-shaped positioning frame of the present invention; Figure 5 The internal structure of the temperature control mechanism of this invention exploded. Figure 1 ; Figure 6 The internal structure of the temperature control mechanism of this invention exploded. Figure 2 ; Figure 7 This is an exploded view of the internal structure of the temperature measuring mechanism of the present invention; Figure 8 This is a schematic diagram of the assembly of the support frame, hoisting mechanism, and control components of the present invention; Figure 9 This is a schematic diagram of the combination of the control components and the hoisting mechanism of the present invention; Figure 10 This is a schematic diagram of the hoisting mechanism, temperature measuring mechanism, and heating cylinder assembly of the present invention; Figure 11 This is an exploded view of the internal structure of the control component of the present invention.

[0023] Illustrations: 1. Placement platform; 2. Control console; 3. Arc-shaped positioning frame; 4. Temperature control mechanism; 41. Electric heating plate; 42. Water bath; 43. Support frame; 44. Heating cylinder; 45. High-temperature resistant filter frame; 46. Sealing ring; 5. Stand; 6. Sealing cover; 7. Temperature measuring mechanism; 71. Exhaust pipe; 72. Lifting seat; 73. Connector; 74. Temperature measuring instrument; 8. Lifting mechanism; 81. U-shaped platform; 8 2. Drive shaft; 83. Winding reel; 84. Lifting steel rope; 85. Hook; 86. Bevel gear II; 87. Bevel gear I; 9. Control components; 91. Mounting base; 92. Gear motor; 93. Limit seat; 94. Screw barrel; 95. Helical gear II; 96. Drive shaft; 97. Helical gear I; 98. Positioning telescopic rod; 99. Support base; 910. Adjusting screw; 911. Bending component; 912. Lifting frame. Detailed Implementation

[0024] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Please see Figures 1-11 This invention provides a graded temperature-controlled concentration device, including a placement platform 1 and an arc-shaped positioning frame 3 installed on the top of the placement platform 1. A temperature control mechanism 4 is installed on the top wall of the placement platform 1 for graded temperature-controlled concentration of pomelo extract. A support frame 5 is provided at the rear of the top wall of the placement platform 1. A sealing cover 6 is installed on the top wall of the support frame 5 through a control component 9. A temperature measuring mechanism 7 is provided on the top of the sealing cover 6. A hoisting mechanism 8 is provided on the top wall of the support frame 5. A control console 2 is provided at the front of the placement platform 1. The temperature control mechanism 4 includes an adjustable electric heating plate 41 installed on the top of the placement platform 1. The electric heating plate 41 is electrically connected to the control console 2 and can control the heating temperature of the electric heating plate 41. A water bath 42 is installed on the top of the electric heating plate 41 and inside the arc-shaped positioning frame 3 for holding water and heating in stages to achieve water bath heating. A support frame 43 is placed inside the water bath 42. A heating cylinder 44 is placed inside the water bath 42 and on top of the support frame 43 for holding pomelo extract. A sealing ring 46 is installed on the top of the water bath 42 to seal the area around the heating cylinder 44 and reduce heat dissipation. A high-temperature resistant filter screen 45 is installed inside the heating cylinder 44 for separating the fruit residue in the pomelo extract.

[0028] In this embodiment, the power adjustable electric heating plate 41 can be adjusted in multiple power levels through the control console 2, thereby accurately controlling the water temperature inside the water bath 42 to achieve multi-stage gradient heating. The water bath cylinder 42 adopts a food-grade 304 stainless steel double-layer insulation structure, which can further reduce heat loss during the heating process and improve the heat energy utilization rate. The support frame 43 adopts a hollow structure design, which allows the bottom and wall of the heating cylinder 44 to be completely immersed in the constant temperature water of the water bath 42 to achieve 360° full-wrap uniform heating. The high temperature resistant filter frame 45 built into the heating cylinder 44 adopts an integrated handle design, which can be removed as a whole after concentration to easily separate the fruit pulp fiber, peel residue and other solid impurities in the pomelo extract to ensure the purity of the finished paste.

[0029] Specifically, the sealing cap 6 is located on top of the heating cylinder 44 and is of the same size. The temperature measuring mechanism 7 includes an exhaust pipe 71 installed on top of the sealing cap 6. The exhaust pipe 71 passes through the sealing cap 6 and is connected to the heating cylinder 44. A lifting seat 72 is sleeved on the outer wall of the exhaust pipe 71. After being lifted by air pressure, it is raised and the steam inside the heating cylinder 44 is discharged from the exhaust pipe 71. A plug-in seat 73 is provided on the top of the sealing cap 6. A temperature measuring instrument 74 is plugged into the plug-in seat 73 and used to measure the concentration temperature of the pomelo extract at different stages inside the heating cylinder 44.

[0030] In this embodiment, the exhaust pipe 71 adopts a vertical straight-through structure design to achieve directional and smooth discharge of steam inside the heating cylinder 44, avoiding steam backflow and dilution of materials; The lifting seat 72 adopts a gravity self-balancing sealing structure. Under normal conditions, it relies on its own gravity to block the air inlet of the exhaust pipe 71. Only when the steam pressure inside the heating cylinder 44 exceeds the gravity threshold of the lifting seat 72 will it be lifted by steam to open the exhaust. This achieves automatic pressure balance inside the cylinder to avoid boiling and overflow, and also maintains the sealed state inside the heating cylinder 44, reducing the oxidation and browning of materials caused by the entry of outside air, while avoiding the unorganized loss of volatile flavor substances. Temperature measuring instrument 74 accurately collects the real-time core temperature of the material, and the temperature measurement data can be fed back to control console 2 in real time, providing accurate data support for closed-loop control of graded temperature variation.

[0031] Specifically, the control component 9 includes a mounting base 91 fixedly installed on the top of the support frame 5. A geared motor 92 is provided on the outer wall of the mounting base 91. The power shaft of the geared motor 92 passes through the mounting base 91 and is fixedly installed with a transmission shaft 96. A support base 99 is provided on the top wall of the support frame 5 at the position corresponding to the transmission shaft 96. The front end of the transmission shaft 96 passes through the support base 99 through a bearing and extends to the outside to be fixedly connected to the hoisting mechanism 8.

[0032] In this embodiment, the support seat 99 adopts a fixed support structure with a vertical bearing seat, which can form a two-point stable support for the transmission shaft 96, avoiding radial runout and vibration offset of the transmission shaft 96 during high-speed rotation, and ensuring the smoothness and accuracy of the transmission process. The geared motor 92 is a brake geared motor with self-locking function, which can lock instantly when the transmission shaft 96 rotates to the target position, to prevent the transmission mechanism from slipping or falling back, and to ensure the sealing effect of the sealing cover 6 and the hoisting stability of the hoisting mechanism 8. The geared motor 92 is electrically connected to the control console 2, which enables precise control of forward and reverse rotation and speed, providing a stable power foundation for the synchronous linkage of the subsequent lifting of the sealing cover 6 and the hoisting mechanism 8.

[0033] Specifically, a helical gear 97 is fixedly installed on the outer wall of the drive shaft 96, a screw barrel 94 is rotatably installed inside the support frame 5, a helical gear 95 that meshes with the helical gear 97 is fixedly installed on the outer wall of the screw barrel 94, an adjusting screw 910 is screwed inside the screw barrel 94, a limit seat 93 is fixedly installed at the top of the adjusting screw 910, and a bent part 911 is rotatably installed at the bottom of the adjusting screw 910. The bottom of the bent part 911 is fixedly connected to the top of the sealing cover 6.

[0034] In this embodiment, helical gear 1 97 and helical gear 2 95 can precisely convert the horizontal rotation of the transmission shaft 96 into the vertical fixed-axis rotation of the screw barrel 94; The screw barrel 94 and the adjusting screw 910 form a self-locking precision screw transmission pair, and the large thread pitch between them can quickly achieve lifting and lowering adjustment. By controlling the lifting stroke of the adjusting screw 910, the lifting height of the sealing cover 6 can be precisely controlled, ensuring the precise fitting and sealing of the sealing cover 6 and the heating cylinder 44. The bending component 911 adopts an L-shaped reinforced structure design, which can evenly transmit the lifting force of the adjusting screw 910 to the top center position of the sealing cover 6, ensuring that the sealing cover 6 is subjected to uniform force during lifting and lowering and will not have problems such as unilateral tilting or poor sealing.

[0035] Specifically, a lifting frame 912 is provided on the top wall of the sealing cover 6 and at the position corresponding to the top of the sealing cover 6. A positioning telescopic rod 98 is provided between the lifting frame 912 and the upright frame 5. The fixed end of the positioning telescopic rod 98 is fixedly connected to the inner top wall of the upright frame 5, and the movable end of the positioning telescopic rod 98 is fixedly connected to the top wall of the lifting frame 912.

[0036] In this implementation scheme, the positioning telescopic rod 98 can be simultaneously limited during the lifting and lowering of the sealing cover 6, further ensuring the verticality of the lifting and lowering of the sealing cover 6, completely avoiding radial offset and rotational misalignment of the sealing cover 6 during the lifting and lowering process, and ensuring that the sealing cover 6 can be precisely aligned and fitted with the heating cylinder 44 each time it is lifted and lowered. The telescopic stroke of the positioning telescopic rod 98 is matched with the lifting stroke of the adjusting screw 910. It can achieve a limit when the sealing cover 6 is lowered to the sealing position, so as to avoid the problem of the heating cylinder 44 being displaced and the sealing structure being damaged due to excessive pressure of the sealing cover 6. At the same time, it forms a limit when the sealing cover 6 is raised to the highest position, so as to prevent the adjusting screw 910 from coming out of the screw cylinder 94 and ensure the operational safety of the transmission mechanism.

[0037] Specifically, the geared motor 92 drives the transmission shaft 96 to control the meshing of helical gear 1 97 and helical gear 2 95, and drives the hoisting mechanism 8 to start the hoisting operation simultaneously. While the helical gear 2 95 drives the screw barrel 94 to rotate inside the frame 5, the adjusting screw 910 is screwed up and down, thereby driving the bent part 911 and the sealing cover 6 to quickly disengage from the sealing contact state with the heating cylinder 44. While the sealing cover 6 is being raised and lowered, the positioning telescopic rod 98 is retracted to limit the path and prevent deviation during subsequent reset.

[0038] In this implementation scheme, by using the transmission ratio of helical gear 1 97 and helical gear 2 95, and bevel gear 1 87 and bevel gear 2 86, the sealing cover 6 can be completely removed from the sealing state of the heating cylinder 44 and moved away from the heating cylinder 44. Then, the hoisting mechanism 8 can hoist the heating cylinder 44 to the target discharge height in a synchronized action. This greatly reduces the number of manual operation steps and the intensity of manual labor. At the same time, it completely avoids the risk of burns caused by operators directly contacting the high-temperature heating cylinder 44.

[0039] Specifically, the hoisting mechanism 8 includes a U-shaped platform 81 fixedly installed on the top wall of the support frame 5. A drive shaft 82 is rotatably installed on the inner wall of the U-shaped platform 81. A bevel gear 87 is fixedly installed on the outer wall of the drive shaft 82. A bevel gear 86 is meshed with the bevel gear 87. The bevel gear 86 is fixedly connected to the transmission shaft 96.

[0040] In this embodiment, the U-shaped platform 81 can provide stable double-end support for the drive shaft 82, avoiding bending and deformation of the drive shaft 82 during rotation and hoisting load-bearing, and ensuring the structural strength and safety of the hoisting operation. The meshing structure of bevel gear 87 and bevel gear 86 enables a 90° reversal transmission from horizontal rotation of drive shaft 96 to vertical rotation of drive shaft 82, ensuring that drive shaft 82 and drive shaft 96 rotate at the same speed and synchronously.

[0041] Specifically, when the drive shaft 96 is rotated under force, it will control the drive shaft 96, bevel gear 2 86 and bevel gear 1 87 to form a meshing transmission at the same speed, thereby causing bevel gear 1 87 to drive the drive shaft 82 to rotate at the same speed.

[0042] In this embodiment, the bevel gear 86 is fixedly connected to the drive shaft 96, which can ensure the stable transmission of transmission torque between the bevel gear 86 and the drive shaft 96, and avoid problems such as transmission slippage and hoisting speed loss. The lifting and lowering of the sealing cover 6 and the raising and lowering of the hoisting steel rope 84 are synchronized through the meshing transmission of bevel gear 87 and bevel gear 86.

[0043] Specifically, both ends of the drive shaft 82 are fixedly mounted with winding wheels 83 through bearings through the U-shaped platform 81. The outer wall of the winding wheels 83 is wound around and mounted with hoisting steel ropes 84. The bottom ends of the hoisting steel ropes 84 are respectively fixedly mounted with hooks 85 for hanging on the hanging rings on the outer wall of the heating cylinder 44.

[0044] In this embodiment, two sets of winding wheels 83 are symmetrically arranged at both ends of the drive shaft 82, and the wheel groove specifications and winding number of the two sets of winding wheels 83 are the same, which can ensure that the winding and unwinding lengths of the two sets of hoisting steel ropes 84 are synchronized, and avoid the problem of one-sided tilting and material spillage of the heating cylinder 44 during the hoisting process. Hook 85 is attached to the hanging ring on the outer wall of heating cylinder 44 to prevent safety accidents such as detachment and falling during hoisting and to ensure the safety and stability of hoisting operations.

[0045] Specifically, as the drive shaft 82 drives the winding wheel 83 to rotate gradually, the hoisting steel rope 84 and hook 85 are controlled to lift the heating cylinder 44 gradually, so that the pomelo extract is concentrated to a suitable concentration, and then the heating cylinder 44 is separated from the inside of the water bath cylinder 42.

[0046] In this embodiment, the rotation of the winding wheel 83 driven by the drive shaft 82 can precisely control the lifting height of the heating cylinder 44, which can lift the heating cylinder 44 to the top of the water bath 42, so that the heating cylinder 44 is completely removed from the water bath, making it easy for operators to quickly pour out the concentrated grapefruit paste, and at the same time, it is easy to quickly clean the heating cylinder 44 and the high-temperature resistant filter frame 45.

[0047] Working principle of this device: The electric heating plate 41, temperature measuring instrument 74, and geared motor 92 of this device are electrically connected to an external power source through a standardized wire layout, providing a stable and controllable power source for the entire process of the device operation. The signal input terminals of the above-mentioned electrical control components are precisely connected one-to-one with the signal output terminals of the arc-shaped positioning frame 3. The signal feedback terminal of the temperature measuring instrument 74 is connected to the signal input terminal of the controller, which can realize the real-time transmission and precise execution of commands. Furthermore, the corresponding improvement parts for the problems raised in the background technology are described in detail. Through innovative design, a targeted solution is formed. The following is a detailed description of the specific working principle and technical effects. In the pre-treatment stage of material loading, the fully enclosed water bath uniform temperature structure is as follows: First, softened circulating water is added to the water bath cylinder 42 to the preset liquid level. Then, the empty food-grade heating cylinder 44 is placed steadily into the water bath cylinder 42, so that the bottom of the heating cylinder 44 is completely seated on the top of the support frame 43 inside the water bath cylinder 42. The support frame 43 adopts a hollow structure design, which allows the cylinder wall and bottom of the heating cylinder 44 to be completely immersed in the water bath environment, achieving 360° fully enclosed uniform heating. After the heating cylinder 44 is seated, the outer edge is sealed to the outer wall of the sealing ring 46 on the inner side of the top of the water bath cylinder 42. The sealing ring 46 is made of food-grade high-temperature resistant fluororubber material, which can reduce the air convection between the water bath cavity and the outside, greatly reduce the heat loss during the heating process, improve the heat energy utilization rate, and at the same time prevent the water vapor evaporated from the water bath from entering the heating cylinder 44 and diluting the material. The concentrated pomelo extract is then evenly added into the heating cylinder 44. The temperature probe of the temperature measuring instrument 74 is then inserted into the plug-in seat 73 fixed to the inner wall of the heating cylinder 44, allowing the temperature probe to be immersed in the material body to accurately collect the real-time temperature of the material. The temperature measuring instrument 74 synchronously feeds back the collected real-time temperature data to the central controller of the arc-shaped positioning frame 3 to form the basis of the whole process temperature closed-loop control, ensuring that the material temperature matches the preset graded target temperature during the heating process. Sealing and locking and pre-positioning stage: The geared motor 92, fixed to the outside of the mounting base 91 on the top of the upright 5, drives the transmission shaft 96 to rotate synchronously. This, in turn, drives the helical gear 97 at the end of the transmission shaft 96 and the bevel gear 86 on the shaft body to rotate stably on the outer wall of the support base 99. In this stage, through the design of single power source and dual-path meshing transmission, the sealing and locking of the sealing cover 6 and the pre-positioning of the hoisting mechanism 8 are realized simultaneously. The specific transmission and operation process is as follows: The lifting and locking transmission of the sealing cover 6: As the helical gear 1 97 rotates, it rotates synchronously with the helical gear 2 95 it meshes with, thereby driving the screw barrel 94, which is fixed coaxially with the helical gear 2 95, to rotate on a fixed axis in the inner cavity of the stand 5. The inner wall of the screw barrel 94 is provided with an internal thread structure, which forms a self-locking screw transmission pair with the external thread on the outer wall of the adjusting screw 910. As the screw barrel 94 continues to rotate, the adjusting screw 910 drives the limiting seat 93 to gradually descend vertically along the axial direction of the screw barrel 94. Finally, the bending part 911 at the bottom of the adjusting screw 910 pushes the sealing cover 6 to descend smoothly until the outer edge of the sealing cover 6 is completely embedded in the top inner wall of the heating cylinder 44 to form a food-grade static seal. During the entire lifting and lowering process of the sealing cover 6, the lifting frame 912 at the top synchronously drives the positioning telescopic rod 98 to gradually extend, which can limit the lifting path of the sealing cover 6 in real time throughout the process, completely avoiding the problem of radial displacement and poor sealing during the descent of the sealing cover 6, ensuring that a stable and sealed evaporation space is formed inside the heating cylinder 44. This sealed structure can not only prevent the entry of outside air and cause oxidation and browning of materials, but also achieve directional discharge of steam through internal evaporation pressure. It simplifies the structure of the device without the need for additional negative pressure exhaust equipment, while reducing the loss of volatile flavor substances. The hoisting mechanism 8 is lowered synchronously: while the helical gear 97 drives the sealing cover 6 to descend, the bevel gear 86 on the transmission shaft 96 rotates synchronously, driving the bevel gear 87 that meshes with it perpendicularly to form a reversing transmission, which in turn drives the drive shaft 82, which is fixed coaxially with the bevel gear 87, to rotate in the inner cavity of the U-shaped platform 81. The rotation of the drive shaft 82 synchronously drives the winding wheel 83 fixed on its rod to rotate, and the hoisting steel rope 84 wound on the outer wall of the winding wheel 83 is lowered at a uniform speed, which in turn drives the hook 85 at the end of the hoisting steel rope 84 to descend smoothly to the hanging ring position on the outer wall of the heating cylinder 44. The operator only needs to hang the hook 85 on the hanging ring to complete the hoisting pre-positioning operation for subsequent material discharge. Through precise gear transmission ratio design, the hook 85 is lowered to the hanging ring installation height at the same time when the sealing cover 6 is locked in place, which reduces the manual operation steps in the pretreatment stage and lays the foundation for the automated hoisting and unloading after the concentration is completed. The graded temperature variable water bath concentration stage adapts to the rheological characteristics of the material: After the sealing and locking and hoisting pre-positioning are completed, the electric heating plate 41 fixed at the bottom of the water bath cylinder 42 is started through the control console 2. Based on the rheological characteristics change law of the whole cycle of pomelo extract concentration, this stage innovatively adopts a three-stage graded temperature variable water bath heating process with a fully closed-loop temperature feedback control to adapt to the cycle characteristics change of pomelo extract. Pre-concentration and low-temperature dehydration stage: Control panel 2 first controls the electric heating plate 41 to operate at low power to heat the softened water inside the water bath 42 at a low temperature and constant temperature. The temperature of the pomelo extract inside the heating cylinder 44 is stabilized through uniform heat transfer in the water bath. This stage corresponds to the low viscosity range of the pomelo extract. The material has good fluidity and high heat transfer efficiency. Free water in the material is removed by rapid evaporation at low temperature, and the solid content of the material is rapidly increased. The use of a lower heating temperature in this stage can significantly shorten the subsequent high temperature exposure time of the material, while avoiding the problems of boiling and overflow during the boiling process of low viscosity materials. In the main concentration medium-temperature thickening stage: when the temperature measuring instrument 74 detects that the material solids have reached the pre-concentration endpoint threshold (or the preset heating time has been reached), the central controller automatically adjusts the heating power of the electric heating plate 41 through the control console 2 to gradually increase the water temperature inside the water bath 42. The material pectin gradually precipitates and the viscosity increases. The stable evaporation rate is maintained by stable medium-temperature water bath heating. The core technological advantage of water bath heating is that the temperature difference between the heating cylinder wall and the water bath is low, and there is no local high-temperature heating surface throughout the process. Even if the viscosity of the material increases and a thin layer adheres to the wall, its temperature is far below the caramelization threshold of reducing sugar and pectin. This avoids the problems of gelatinization and coking, bitter taste, and irreversible browning caused by long-term contact of the material with the high-temperature wall surface in the existing direct heating process. Low-temperature stabilization molding: When the material reaches the main concentration endpoint threshold, the central controller automatically adjusts the electric heating plate 41 to reduce the heating power. This stage corresponds to the high viscosity range of the material solids. The material fluidity decreases significantly and approaches semi-solid. The material is concentrated into the finished product standard through low-temperature and gentle evaporation. Low-temperature heating at this stage can retain the heat-sensitive active ingredients such as naringin, flavonoids, and vitamin C in the pomelo extract to a large extent, while inhibiting the browning reaction to ensure that the finished pomelo paste presents a bright natural color and unique flavor. During the concentration and evaporation process, the moisture inside the heating cylinder 44 continuously vaporizes to form steam, causing the pressure inside the cylinder to gradually increase. When the internal steam pressure exceeds the gravity threshold of the lifting seat 72, the steam pressure will automatically lift the lifting seat 72 inside the exhaust pipe 71 at the top of the sealing cover 6. The steam will be discharged directionally through the exhaust pipe 71 to achieve automatic pressure balance inside the cylinder. When the pressure inside the cylinder is low, the lifting seat 72 will fall back to the initial position by gravity to maintain the sealed state of the heating cylinder 44, preventing outside air from entering and causing material oxidation. This pressure self-balancing design does not require additional pressure regulating valves and negative pressure equipment, and can achieve stable and controllable evaporation process while avoiding the problem of a large amount of volatile flavor substances being lost without organization with the steam in the existing open cooking process. Automated discharge and post-processing stage: After the preset working time is reached, the central controller controls the electric heating plate 41 to stop heating via the control console 2 to complete the concentration operation. Then, the geared motor 92 is automatically started to rotate in reverse. Through the synchronous reverse operation of the same transmission mechanism, the sealing cover 6 is automatically opened and the heating cylinder 44 is automatically hoisted and discharged. The specific operation process is as follows: The geared motor 92 drives the transmission shaft 96 to rotate in the opposite direction, which in turn drives the helical gear 97 and the bevel gear 86 to rotate in the opposite direction. Through the dual-path transmission, two actions are executed simultaneously: firstly, the helical gear 97 drives the helical gear 95 and the screw barrel 94 to rotate in the opposite direction, which in turn drives the adjusting screw 910 to rise vertically along the axial direction. Through the bending part 911, the sealing cover 6 is driven to rise smoothly and completely separate from the top inner wall of the heating cylinder 44, thus releasing the sealing state. Secondly, bevel gear 86 drives bevel gear 87 to rotate in the opposite direction to drive shaft 82, which in turn drives winding wheel 83 to rotate in the opposite direction. This causes the hoisting steel rope 84 to be wound up at a uniform speed. Through the connection between hook 85 and hanging ring, the heating cylinder 44 is driven to rise steadily and vertically, so that the heating cylinder 44 is completely separated from the water bath 42, support frame 43 and sealing ring 46 and raised to an operating height that is convenient for material discharge. At the same time, the speed at which the sealing cover 6 is removed is greater than the hoisting speed of the heating cylinder 44. After the heating cylinder 44 is hoisted into place, the operator can directly and smoothly remove the built-in high-temperature resistant filter frame 45 from the heating cylinder 44. The high-temperature resistant filter frame 45 is made of food-grade 304 stainless steel, which can accurately filter impurities such as fruit pulp fibers and peel residue in the pomelo paste. At the same time, it can intercept trace amounts of charred particles that may be generated during the concentration process to further ensure the purity and food safety of the finished product. After filtration, the concentrated pomelo paste can be smoothly poured out from the heating cylinder 44 to complete the full-process graded temperature-variable concentration processing.

[0048] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A staged temperature-varying concentration device, comprising a placement platform (1) and an arc-shaped positioning frame (3) mounted on the top of the placement platform (1), characterized in that: The top wall of the placement platform (1) is equipped with a temperature control mechanism (4) for graded temperature control concentration of pomelo extract. A stand (5) is provided at the rear of the top wall of the placement platform (1). A sealing cover (6) is installed on the top wall of the stand (5) through a control component (9). A temperature measuring mechanism (7) is provided on the top of the sealing cover (6). A hoisting mechanism (8) is provided on the top wall of the stand (5). A control console (2) is provided at the front of the placement platform (1). The temperature control mechanism (4) includes an adjustable electric heating plate (41) installed on the top of the placement platform (1). The electric heating plate (41) is electrically connected to the control console (2) and can control the heating temperature of the electric heating plate (41). A water bath cylinder (42) is set on the top of the electric heating plate (41) and inside the arc-shaped positioning frame (3) for holding water and heating in stages to achieve water bath heating. A support frame (43) is placed inside the water bath cylinder (42). A heating cylinder (44) is placed inside the water bath cylinder (42) and on top of the support frame (43) for holding pomelo extract. A sealing ring (46) is set on the top of the water bath cylinder (42) to seal the area around the heating cylinder (44) to reduce heat dissipation. A high-temperature resistant filter screen (45) is set inside the heating cylinder (44) for separating the fruit residue in the pomelo extract.

2. The staged temperature-varying concentration device according to claim 1, characterized in that: The sealing cap (6) is located on the top of the heating cylinder (44) and is of the same specification. The temperature measuring mechanism (7) includes an exhaust pipe (71) installed on the top of the sealing cap (6). The exhaust pipe (71) passes through the sealing cap (6) and is connected to the heating cylinder (44). A lifting seat (72) is sleeved on the outer wall of the exhaust pipe (71). After being lifted by air pressure, it is lifted and the steam inside the heating cylinder (44) is discharged from the exhaust pipe (71). A plug-in seat (73) is provided on the top of the sealing cap (6). A temperature measuring instrument (74) is plugged into the plug-in seat (73) for measuring the concentration temperature of the pomelo extract at different stages inside the heating cylinder (44).

3. The staged temperature-varying concentration device according to claim 1, characterized in that: The control component (9) includes a mounting base (91) fixedly installed on the top of the stand (5). A geared motor (92) is provided on the outer wall of the mounting base (91). The power shaft of the geared motor (92) passes through the mounting base (91) and is fixedly installed with a transmission shaft (96). A support base (99) is provided on the top wall of the stand (5) at the position corresponding to the transmission shaft (96). The front end of the transmission shaft (96) passes through the support base (99) through a bearing and extends to the outside to be fixedly connected to the hoisting mechanism (8).

4. The staged temperature-varying concentration apparatus according to claim 3, characterized in that: A helical gear 1 (97) is fixedly installed on the outer wall of the drive shaft (96). A screw cylinder (94) is rotatably installed inside the support frame (5). A helical gear 2 (95) that meshes with the helical gear 1 (97) is fixedly installed on the outer wall of the screw cylinder (94). An adjusting screw (910) is screwed inside the screw cylinder (94). A limit seat (93) is fixedly installed at the top of the adjusting screw (910). A bent part (911) is rotatably installed at the bottom of the adjusting screw (910). The bottom of the bent part (911) is fixedly connected to the top of the sealing cover (6).

5. The staged temperature-varying concentration apparatus according to claim 1, characterized in that: A lifting frame (912) is provided on the top wall of the sealing cover (6) and at the position corresponding to the top of the sealing cover (6). A positioning telescopic rod (98) is provided between the lifting frame (912) and the upright frame (5). The fixed end of the positioning telescopic rod (98) is fixedly connected to the inner top wall of the upright frame (5), and the movable end of the positioning telescopic rod (98) is fixedly connected to the top wall of the lifting frame (912).

6. A staged temperature-varying concentration apparatus according to claim 3, characterized in that: The geared motor (92) drives the transmission shaft (96) to control the meshing of helical gear one (97) and helical gear two (95), and drives the hoisting mechanism (8) to start the hoisting operation simultaneously. The helical gear two (95) drives the screw barrel (94) to rotate inside the frame (5), while the adjusting screw (910) is screwed up and down, thereby driving the bent part (911) and the sealing cover (6) to quickly disengage from the sealed contact state with the heating cylinder (44). While the sealing cover (6) is being raised and lowered, the positioning telescopic rod (98) is retracted to realize the path limit placement and subsequent reset if deviation occurs.

7. The staged temperature-varying concentration apparatus according to claim 1, characterized in that: The hoisting mechanism (8) includes a U-shaped platform (81) fixedly installed on the top wall of the support frame (5). A drive shaft (82) is rotatably installed on the inner wall of the U-shaped platform (81). A bevel gear (87) is fixedly installed on the outer wall of the drive shaft (82). A bevel gear (86) is meshed with the bevel gear (87). The bevel gear (86) is fixedly connected to the transmission shaft (96).

8. A staged temperature-varying concentration apparatus according to claim 3, characterized in that: When the drive shaft (96) is rotated under force, it will control the drive shaft (96), bevel gear two (86) and bevel gear one (87) to form a meshing transmission at the same speed, thereby causing bevel gear one (87) to drive the drive shaft (82) to rotate at the same speed.

9. A staged temperature-varying concentration apparatus according to claim 7, characterized in that: Both ends of the drive shaft (82) are fixedly installed with winding wheels (83) through bearings through the U-shaped platform (81). The outer wall of the winding wheel (83) is surrounded by a hoisting steel rope (84). The bottom end of the hoisting steel rope (84) is fixedly installed with hooks (85) for hanging on the hanging ring on the outer wall of the heating cylinder (44).

10. A staged temperature-varying concentration apparatus according to claim 7, characterized in that: As the drive shaft (82) drives the winding wheel (83) to rotate gradually, the hoisting steel rope (84) and hook (85) are controlled to lift the heating cylinder (44) gradually, so that the pomelo extract is concentrated to a suitable concentration, and then the heating cylinder (44) is separated from the inside of the water bath (42).

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