A large-scale building block type micro-positive pressure steaming equipment and steam addition control method thereof

Abstract

The present invention provides a large-scale building block type micro-positive pressure cooking equipment and a steam adding control method thereof, which relates to a cooking equipment structure, including a tank structure formed by building block combination connection, in which steam is added through a steam adding pipeline, and a micro-positive pressure cavity is formed in the tank structure, the top feed port of the tank structure is connected with a feed positive pressure air shutoff device, the feed positive pressure air shutoff device is connected with a front process equipment for grain feeding, the bottom discharge port of the tank structure is connected with a discharge positive pressure air shutoff device, the discharge positive pressure air shutoff device is connected with a back process equipment for grain unloading, and at least one group of safety pressure relief devices, which are mechanical pressure door pressure relief devices, are installed on the top of the tank structure. The present invention can minimize steam leakage during equipment operation, and at the same time, the building block type and reinforced design of the tank structure can not only allow for greater internal pressure, better safety, but also more convenient manufacturing, transportation, installation and maintenance.

Description

Technical Field

[0001] The invention relates to a cooking equipment structure, in particular to a large-scale building block type micro-positive pressure cooking equipment and a steam adding control method thereof. Background Art

[0002] In the tableting production line of corn, oats, wheat, barley, rice and millet, cooking is a necessary process before tableting. If the uncooked grains are directly tableted, problems such as slipping, blocking, inability to press, excessive powdering rate, insufficient product maturity, unformed products, tablet press vibration, and high tablet press load will occur.

[0003] During the cooking process, saturated steam is generally introduced into the equipment through the built-in steam adding pipeline to evenly heat the grains in the equipment, sterilize them and improve the maturity of the grains, ensure that moisture and heat fully penetrate into the core of the grains to soften them, so as to facilitate the normal operation of the tablet press in the subsequent process and finally produce perfect finished flakes;

[0004] However, the feeding method of the steaming equipment in the current industry is generally direct feeding through a chute, or feeding through an auger, or feeding through an ordinary air lock, and the discharge port is generally directly connected to the tablet press, so the equipment is poorly sealed, the equipment is basically at normal pressure, and the maximum steaming temperature is less than 99°C. Specifically: 1. When the steaming temperature is not enough, the product will be low in maturity, the appearance will not meet the standards, and the tablet press will have high load and large vibration; 2. When the equipment is poorly sealed, a large part of the steam will flow into the elevator above the feed and the tablet press below the discharge. In the long run, the elevator will rust and corrode, the bucket belt will break, the tablet press will drip seriously, and the corrosion will be serious. At the same time, it can also cause a lot of steam waste;

[0005] The existing steaming and cooking equipment also has defects such as: 1. The steam adding pipeline inside the equipment generally adopts a simple single-channel pipeline design with equal diameter, so there will be uneven steam addition, which will lead to uneven heating of grains, uneven quality of finished products, color difference in appearance and other problems; 2. In addition, the steam adding pipeline in the existing steaming and cooking equipment is generally directly welded inside the equipment, so it is not convenient to overhaul, maintain and replace it later, and the scalability is not strong; 3. Thirdly, steam addition is generally controlled by manual valves, and the cooking temperature fluctuates greatly, which affects the uniformity and stability of product quality, and is cumbersome to operate; 4. Finally, it is particularly important that similar The diameter of large steaming tanks is more than 2 meters and the length is more than 10 meters, so they are large in size and weight. There are generally two manufacturing methods for this kind of large equipment. One is to make it directly on-site. The quality of products manufactured in this way is difficult to guarantee, and the failure rate in the later stage is high. The other is to transport it to the site for direct installation after the overall manufacturing is completed in the factory. This method is difficult to manufacture, has high requirements on the production site, is difficult to transport, and is troublesome to install. Moreover, for manufacturers, because the equipment configuration of each customer is different, each steaming equipment is a customized product, which is not conducive to the standardized management of internal product drawings and manufacturing of manufacturers.

[0006] Specific patents for cooking equipment in the prior art include: Patented cooking tower for grain steam flaking (Announcement No. CN103070461B, Patented corn steam ripening flaking system (Announcement No. CN210353097U), Patented cooking tank for corn steam flaking production (Announcement No. CN216674588U), but none of them discloses technical solutions to solve the above technical problems. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a large-scale building block type micro-positive pressure cooking equipment and a steam addition control method thereof, which can minimize steam leakage during the operation of the equipment. At the same time, the building block and reinforced design of the tank structure can not only allow it to withstand a larger internal pressure and have better safety, but also be more convenient to manufacture, transport, install and maintain.

[0008] The present invention provides the following technical solutions:

[0009] A large-scale building block type micro-positive pressure cooking equipment, including a tank structure formed by building block combination connection, steam is added through a steam adding pipe, and a micro-positive pressure cavity is formed in the tank structure, such as when the maximum pressure limiting the micro-positive pressure environment in the micro-positive pressure cavity is 0.8 bar, the maximum cooking temperature can reach 115 ° C, at this time the cooking effect is better, the product is more mature, and the steam utilization rate is also higher, the top feed port of the tank structure is connected to a feed positive pressure air shutoff device, the feed positive pressure air shutoff device is connected to the front process equipment for feeding grains into the tank structure, the bottom discharge port of the tank structure is connected to a discharge positive pressure air shutoff device, the discharge positive pressure air shutoff device is connected to the back process equipment It is also used for continuous unloading of grains. In the continuous production process of grains, the feed inlet is generally connected to the elevator, and the discharge port is generally directly connected to the tablet press. The setting of the feed positive pressure air shutoff and the discharge positive pressure air shutoff can reduce the steam leakage in the tank structure during continuous production, thereby achieving better pressure building and pressure maintenance in the tank structure during work. Because the positive pressure air shutoff is made of stainless steel as a whole, the rotor, cylinder, and end cover are all precision machined, with high matching accuracy and small rotor jump. The sealing strip made of modified PTFE material is used between the rotor and the cylinder, which has good sealing, long service life, and little wear on the cylinder. Therefore, the positive pressure air shutoff can make the overall sealing of the cooking environment good, and feeding and discharging can be done at the same time. It can also effectively reduce the amount of steam leakage. With the continuous introduction of steam, a slight positive pressure can be generated and maintained in the cooking equipment. At the same time, good airtightness also greatly reduces the possibility of steam backflowing to the elevator above the feed and the tablet press below, protecting the upstream and downstream equipment and greatly reducing steam energy consumption. Therefore, even if the air shut-off device has a theoretical steam consumption, it can still ensure that the overall equipment is in a stable and sealed working state. At least two groups of safety pressure relief devices are installed on the top of the tank structure to ensure the safe operation of the equipment. At least one group of safety pressure relief devices is a mechanical pressure door pressure relief device. At this time, the setting of the safety pressure relief device is to ensure that the maximum pressure in the tank structure of the cooking equipment does not exceed Exceeding the maximum pressure limit, such as the above-mentioned micro-positive pressure not exceeding 0.8 bar, the setting of at least one set of mechanical pressure door pressure relief device is a double insurance technical solution. Because the grains contain powdery impurities during production, during the long-term operation of the equipment, although ordinary safety pressure relief devices are widely used, there is a risk of the pressure relief channel being blocked by powdery impurities. For example, when the pressure in the tank structure reaches the maximum pressure limit, using ordinary safety pressure relief devices, such as standard safety valves, even if the standard safety valve completes the opening action, if blockage occurs, it may be difficult to achieve the purpose of opening pressure relief, and it is also not easy to clean. The mechanical pressure door pressure relief device can play the role of the last line of defense and is also easier to clean.

[0010] Preferably, the mechanical pressure door pressure relief device includes a mounting base, a valve body, a valve core, a lever, and a counterweight block, the bottom flange of the valve body is connected to the top flange of the pressure relief port, and the mounting base, the valve body and the pressure relief port are fixed by connecting bolts and connecting nuts locked on the connecting bolts, a group of O-rings are installed at the top opening of the valve body, a group of valve cores hingedly installed on one side of the valve body are used to rotatably cover the valve body, and mechanically seal and cover by crimping on the O-rings, a group of levers are connected to the top side of the valve core, and the levers are sequentially provided with a plurality of groups of adjustment hole suspension positions along the extension direction of the force arm, and the counterweight block is suspended and installed at different adjustment hole suspension positions to divide the gear adjustment valve core cover and seal the pressure on the valve body, thereby controlling the discharge pressure of the pressure relief port, this mechanical pressure relief adjustment structure is not only low in cost, but also convenient in maintenance, and at the same time, when setting the discharge pressure, the counterweight block only needs to be directly suspended at the adjustment hole installation position of the corresponding gear. That is, there is no need for time-consuming and labor-intensive manual adjustment and shifting, and it is more convenient. For example, when four groups of adjustment hole suspension positions are set along the extension direction of the lever arm, these four groups of adjustment hole suspension positions can be divided into four gears. The adjustment hole suspension position at the far end of the lever arm can correspond to the high discharge pressure gear. The counterweight blocks of the same weight are suspended and installed here, and the pressure is greater than that of the adjustment hole suspension position at the proximal end. After the counterweight block is suspended and installed at the adjustment hole suspension position, there is no need for manual precise adjustment of the position on the lever, thereby saving time for manual adjustment and shifting, which is more time-saving and labor-saving. Therefore, the division of gears can greatly improve the accuracy and speed of manual operation, that is, each time the counterweight block is suspended, the personnel only need to suspend the counterweight block directly at the adjustment hole suspension position corresponding to the gear, and there is no need for manual time-consuming precision adjustment of the position, which is more time-saving and labor-saving. After the installation is completed, when the pressure in the tank reaches the discharge pressure, the valve core and the lever will be pushed upward, and the pressure relief port can discharge the pressure from the opening at the top of the valve body.

[0011] Preferably, the mechanical pressure door pressure relief device also includes an air suction hood and a guide frame, wherein the air suction hood is positioned on the mounting base through mounting columns distributed on the periphery of the valve body, wherein one end of the flared opening is arranged toward the valve body, and one end of the shrunken opening is arranged away from the valve body and connected to the fan through a pipeline, thereby ensuring that when the grain is steamed, when the tank reaches the discharge pressure to discharge steam, the discharged steam can be guided and discharged by the air suction hood, thereby ensuring a clean environment in the factory and avoiding the influence of diffused steam on the factory building and the equipment and personnel in the factory building, and since the mounting columns are distributed on the periphery of the valve body and are the same structure as the valve body installed on the mounting base, it can be a batch-assembled processing part, which is convenient for assembly, production, maintenance and replacement;

[0012] The guide frame is fixed on the mounting base, and two sets of guide plates with adjustment gaps are mounted on the guide frame. The lever is limited in the adjustment gap to keep the horizontal direction of the lever constant during pressure relief. Therefore, when the plate-shaped lever is lifted up by pressure relief, the guide plates are limited on both sides of the plate-shaped lever, so that the lever will not swing horizontally, thereby ensuring that the valve core can accurately return to the original position after pressure relief is completed, thereby ensuring sealing;

[0013] The guide plate is provided with a stepped countersunk hole for the end of the locking bolt to penetrate into, and the screw rod of the locking bolt passes through the stepped countersunk hole and the plate surface of the guide plate is locked and pressed onto the guide frame through the locking nut. Since the end of the locking bolt penetrates into the stepped countersunk hole, the guide limit fit between the plate surface of one side of the guide plate and the plate surface of the lever will not be affected. Moreover, the plate surface of the other side of the guide plate is pressed and locked with the guide frame through the cooperation of the locking bolt and the locking nut, so the adjustment is also relatively convenient.

[0014] Preferably, in order to improve the stability of the guide frame positioning and facilitate the combined batch rapid assembly positioning, the guide frame can be provided with a bottom plate and a top plate positioned on the mounting column, the bottom plate is fixed on the mounting base, and two groups of guide vertical plates for correspondingly mounting the two groups of guide plates are detachably connected between the bottom plate and the top plate, and a group of limit plates are also provided under the top plate, and the limit plates are limitedly mounted on the mounting column by nuts, and are used to constrain the highest position of the lever to prevent the pressure door from opening excessively, and because the guide vertical plates are detachably connected between the bottom plate and the top plate, the customer After receiving the device, the user can flexibly adjust the installation position of the guide vertical plate according to the needs of the counterweight installation position in the actual working conditions. It can be the position shown in the figure, or the mirror image installation position of the guide vertical plate on the bottom plate in the figure. The two ends of the guide vertical plate are connected to the long waist holes of the bottom plate and the top plate by screw locking, so as to complete the detachable connection between the top plate, the bottom plate and the guide vertical plate. Therefore, when it is necessary to fine-tune the gap width between the two sets of guide plates, the screws can be directly loosened and the position of the screws in the long waist holes of the bottom plate and the top plate can be adjusted, which is more convenient to adjust.

[0015] Preferably, the steam addition pipeline includes a T-shaped steam drum, a steam drum support, and a steam ring, wherein one end of the vertical end of the T-shaped steam drum is fixedly connected to the inner wall of the tank structure and docked with the steam inlet of the tank structure to allow steam to enter, and both ends of its horizontal ends are provided with clamping plates and supported by two groups of steam drum support members, the steam drum support member is fixedly connected to the inner wall of the tank structure, and two groups of limiting side plates for limiting on both sides of the clamping plates are also provided on the top, thereby ensuring that the T-shaped steam drum will not deviate and can always position the support on the steam drum support member, and the clamping plates and the limiting side plates are also provided with long waist holes, and stainless steel bolts pass through the long waist holes of the T-shaped steam drum and the steam drum support member and are loosely connected with stainless steel metal anti-loosening nuts, thereby allowing the T-shaped steam drum and the steam drum support member to be fine-tuned in the horizontal sliding position, thereby preventing the thermal expansion stress caused by the T-shaped steam drum heating speed being faster than the tank structure when the equipment is started. The tank structure is deformed, that is, when the T-type steam drum is deformed relative to the tank structure, the stress will not be directly applied to the tank structure due to the locking fixation, but the stainless steel bolts will only be loosely connected in the long waist hole so that the T-type steam drum can have a space margin for horizontal sliding adjustment relative to the steam drum support. At this time, the stainless steel bolts are equivalent to connecting pins, which play a role of insurance, connecting the T-type steam drum and the steam drum support, but do not affect the horizontal sliding between the two. The steam ring is at least one group, and it is connected to the T-type steam drum through the steam inlet flange. A number of steam outlet holes are evenly opened on both sides and the bottom of the steam coil of the steam ring for evenly adding steam to the tank structure. The diameter of the T-type steam drum is larger than the diameter of the steam ring, so as to ensure that the steam entering the steam coil is sufficient and uniform. At the same time, the overall assembly design is adopted, which is more convenient to manufacture, install and maintain.

[0016] Preferably, the steam ring is provided with three groups, namely, an outer steam ring, a middle steam ring, and an inner steam ring, which are coaxial and distributed in sequence from the outside to the inside, and each group of steam rings has two groups of symmetrically distributed steam inlet flanges connected to the T-shaped steam drum. At this time, the steam directly enters the steam ring from the T-shaped steam drum through the two symmetrically distributed steam inlet flanges, accelerating the diffusion in the steam ring, thereby improving the effect of uniform heating of the steam when it enters the tank structure, and a group of supporting beams are also fixed in the tank structure, on which steam ring supports are installed, and the steam ring is reinforced and positioned on the supporting beams by corresponding steam ring supports, thereby ensuring that the steam ring is firmly installed and allowing maintenance personnel to directly step on the steam ring to complete maintenance work. In order to reduce the difficulty of maintenance of the steam ring, the outer steam ring and the middle steam ring can be arranged to be respectively connected by two groups of identical half rings through docking flanges Connection settings. In actual applications, the design method of the pipe diameter distribution of the steam addition pipeline is as follows: Take the 1000kg / h flow design as an example: the steam inlet is a DN100 standard flange, the inner diameter of the T-type steam drum is 102mm, and there are three sets of steam rings. The outer, middle and inner circles are coaxially arranged in sequence. The three circles of steam coils divide the entire tank body into three areas on the transverse cross-sectional circle. Each steam coil is responsible for the steam supply of one area. In terms of area, the outer, middle and inner circles of steam coils are responsible for areas accounting for 57%, 29% and 14% respectively. According to the area ratio, the inner diameters of the outer, middle and inner circles of steam coils are selected to be 53mm, 42mm and 28mm respectively. Compared with the T-type steam drum, the actual flow area of ​​the outer, middle and inner circles of steam coils is twice that of the T-type steam drum, thereby ensuring a uniform and sufficient supply of steam.

[0017] Preferably, the tank structure includes a top cover, a lower hopper, an intermediate section and a steam adding section, the top of the top cover is used to install a feed positive pressure air shutoff, and a top level device for measuring the storage material level to control the feed of the cooking equipment is also installed thereon, the circular outlet of the lower hopper is used to connect the discharge positive pressure air shutoff through a transition connecting section, and the setting of the transition connecting section can facilitate the replacement and maintenance of the discharge positive pressure air shutoff when the subsequent production capacity increases, because if the production capacity increases, the model of the discharge positive pressure air shutoff will also be changed, and the inlet size of the discharge positive pressure air shutoff will change at this time. If the lower hopper and the discharge positive pressure air shutoff are directly connected, the lower hopper needs to be redesigned, which is more troublesome. Therefore, by adapting transition connecting sections of different sizes, the lower hopper can be kept unified and standardized management can be achieved. The inlet of the existing air shutoff is square. If the lower hopper and the air shutoff are directly connected, the lower hopper must be designed to be round to square, and the round The biggest problem with the square shape is that its structural strength is not as good as that of the cone shape, and it also increases the difficulty of production. The middle section and the steam adding section are located between the top cover and the lower hopper, and respectively include at least one group of middle standard units and at least one group of steam adding standard units, and the middle standard units and the steam adding standard units are connected between the top cover and the lower hopper in a building block-like combination. The middle standard units are used to increase the storage capacity. If the customer has high production capacity requirements, the combination can increase the storage capacity by adding more middle sections. The steam adding standard units are used to install steam adding pipes, and at least one layer of steam adding pipes is installed in each group of steam adding standard units. At this time, if the customer does not consider the energy consumption of steam, but emphasizes the requirements of high degree of maturation and high cooking temperature, more steam adding standard units can be added or the single-layer steam adding can be changed to a double-layer steam adding, so as to achieve better flexibility, and the standardized parts assembly installation manufacturing, transportation and installation are also more convenient.

[0018] Preferably, the steam adding standard unit is also equipped with a steam adding level meter and a steam adding temperature sensor. The steam adding level meter is located above the steam adding pipeline and is used to detect whether the grain level is higher than the steam adding pipeline. The steam adding temperature sensor is used to detect the real-time temperature of the grain steaming. The steam inlet of the tank structure is connected to a proportional control valve for controlling the steam entry speed. The top cover and the transition connection section are also equipped with a top temperature sensor and a bottom temperature sensor for displaying the cooking temperature at the top and bottom of the tank structure as a basis for judging the heating uniformity.

[0019] A steam addition control method for a large-scale building block type micro-positive pressure steaming equipment, based on the large-scale building block type micro-positive pressure steaming equipment, comprises the following steps:

[0020] First, the grains in the soaking bin of the preceding process equipment are transported by the elevator and sent into the tank structure through the feed positive pressure air shutoff device to start feeding. When the grains flood the steam adding pipe in the steam adding section, the steam adding level device detects the material level signal and outputs a switch signal to the control system. The control system then controls the proportional control valve to open to introduce steam into the tank structure. At the same time, the control system has a cooking set temperature input by the user. For example, if the set temperature is 110°C, the control system will monitor the temperature of the steam adding section in real time through the steam adding temperature sensor. When the steam adding temperature sensor detects a temperature lower than the set temperature, the proportional control valve increases in opening to add more steam into the tank structure, and the cooking temperature begins to rise. When the temperature at the steam adding temperature sensor reaches or exceeds the set temperature, the steam When the temperature is set, the opening of the proportional control valve decreases to limit the amount of steam added. Finally, the opening of the proportional control valve reaches a balance to ensure that the actual cooking temperature is maintained within the set temperature ±1°C range. After completing the initial cooking preheating, the tablet press of the subsequent process equipment is started. At this time, the discharge positive pressure air shutoff device begins to discharge material, and the production line is continuously produced until the grain in the infiltration bin of the previous process equipment is empty. The control system controls the feed positive pressure air shutoff device to stop feeding, and the discharge positive pressure air shutoff device continues to unload material, which will gradually reduce the material level in the cooking equipment. When the grain is lower than the steam addition pipeline of the steam addition section, the steam addition material level device detects the material level signal, and the control system controls the proportional control valve to close, the steam addition stops, the discharge positive pressure air shutoff device completes discharging, and the production ends.

[0021] At this time, the steam addition control adopts closed-loop PID automatic control of proportional control valve + temperature sensor. The temperature fluctuation can be controlled within ±1°C, the cooking temperature is more stable, the heating is more uniform, no manual operation is required, and the degree of automation is higher. At the same time, by collecting the steam level device signal, the automatic opening and closing of steam addition during startup and shutdown can be realized, and the degree of automation is also higher.

[0022] The beneficial effects of the present invention are:

[0023] 1. The positive pressure air lock design is adopted at the feed inlet and the discharge port, thereby improving the airtightness of the cooking equipment during continuous production. When steam is introduced for cooking, a slight positive pressure can be generated and maintained in the tank structure, thereby increasing the cooking temperature, increasing the degree of product maturation, reducing energy consumption, and protecting upstream and downstream equipment;

[0024] 2. By configuring a double insurance safety pressure relief device on the top of the cooking equipment, it is ensured that the pressure inside the tank structure does not exceed the maximum limit pressure, thereby avoiding potential safety hazards. The mechanical pressure door pressure relief device can serve as the last line of defense, which is not only easier to clean, but also more reliable to open and close;

[0025] 3. In the design of the steam adding pipeline, the pipeline distribution mode and pipeline diameter are reasonably designed and allocated, which can make the steam addition more sufficient and more uniform. At the same time, the assembly design is adopted, which is more convenient for production, installation and maintenance. The steam adding control method adopts the closed-loop PID automatic control of the proportional control valve + temperature sensor, which makes the cooking temperature more stable and the heating more uniform. There is no need for manual operation, and the degree of automation is higher. At the same time, the material level sensor signal is collected to realize the automatic opening and closing of the steam addition during the startup and shutdown process;

[0026] 4. The whole machine is designed in building block style. All sub-components are standard products. Through any combination, it can meet the production capacity and cooking time required by different customers. The standard sub-components can facilitate the manufacturer to implement standardized design, manufacturing and management, and also facilitate manufacturing, transportation and installation.

[0027] 5. The mechanical pressure door pressure relief device is designed as an open type as a whole, that is, each group of components is installed in an open environment, and the valve core and valve body can be opened at the top for discharge and pressure relief, and can also be automatically sealed, so that the overall structure is not easy to be blocked and is easier to clean; secondly, when setting the discharge pressure, the counterweight block only needs to be directly suspended at the installation position of the adjustment hole of the corresponding gear, without the need for manual time-consuming and laborious adjustment and displacement on the lever, which is more convenient and ensures the accuracy of each gear adjustment, reducing the error probability of the customer's manual displacement adjustment judgment, that is, completely eliminating the possibility of misoperation by the customer, and after the counterweight block is hung, it can be completely positioned without displacement, and the reliability is better;

[0028] Thirdly, due to the addition of a set of mounting bases, the bottom end of the valve body is also connected to the mounting base when it is docked with the pressure relief flange of the tank body, and the added mounting base can be used as a base for positioning the suction hood, guide frame, mounting column and limit plate, which is convenient for modular design and mass production combination, and each structure is mechanically connected, the distribution is relatively compact, and the connection is relatively reliable and convenient. The setting of the guide frame can also completely eliminate the possibility of horizontal shaking of the lever, because when the hinge is assembled and manufactured, there will inevitably be a fitting gap. Therefore, if the rotation is only achieved through the hinge, the lever will shake horizontally during pressure relief, thereby affecting the sealing when it is closed again. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the top cover;

[0032] Figure 3 It is a schematic diagram of the structure of a standard steam adding unit with a double-layer steam adding pipeline;

[0033] Figure 4 is different from Figure 1 Schematic diagram of the steam adding standard unit structure with steam adding pipeline in the middle;

[0034] Figure 5 It is a three-dimensional structural schematic diagram of a mechanical pressure door pressure relief device;

[0035] Figure 6 It is a structural cross-sectional view of the mechanical pressure door pressure relief device in the closed state;

[0036] Figure 7 It is a structural cross-sectional view of the mechanical pressure door pressure relief device in the pressure relief state;

[0037] Figure 8 It is a structural diagram of the steam addition pipeline installed in the steam addition standard unit;

[0038] Fig. 9 It is a three-dimensional structural schematic diagram of the steam addition pipeline;

[0039] Fig.10 It is a partial structural diagram of the steam coil;

[0040] Fig.11 yes Fig. 9 Schematic diagram of the main structure;

[0041] Markings in the figure: 1 is the tank structure, 2 is the steam addition pipeline, 3 is the feed positive pressure air shutoff device, 4 is the discharge positive pressure air shutoff device, 5 is the mechanical pressure door pressure relief device, 6 is the standard safety valve,

[0042] 11 is the top cover, 12 is the lower hopper, 13 is the middle section, 14 is the steam adding section, 15 is the top material level device, 16 is the transition connecting section, 17 is the steam adding material level device, 18 is the steam adding temperature sensor, 19 is the top temperature sensor, 110 is the bottom temperature sensor, 111 is the steam inlet, 112 is the proportional control valve,

[0043] 51 is the mounting base, 52 is the valve body, 53 is the valve core, 54 is the lever, 55 is the counterweight, 56 is the O-ring, 57 is the adjustment hole suspension position, 58 is the air suction cover, 59 is the guide frame,

[0044] 590 is a guide plate, 591 is a bottom plate, 592 is a top plate, 593 is a guide vertical plate, 594 is a limit plate, 595 is a mounting column,

[0045] 21 is a T-shaped steam drum, 22 is a steam drum support, 23 is a steam ring, 24 is a clamping plate, 25 is a long waist hole, 26 is a stainless steel bolt, 27 is a supporting beam, 28 is a steam ring support,

[0046] 231 is an outer steam ring, 232 is a middle steam ring, and 233 is an inner steam ring. DETAILED DESCRIPTION

[0047] Example 1

[0048] like Figure 1-4As shown, a large-scale building block type micro-positive pressure cooking equipment, in this embodiment, includes a tank structure 1 formed by building block combination connection, steam is added through the steam adding pipe 2, and a micro-positive pressure cavity is formed in the tank structure 1. For example, when the maximum pressure limiting the micro-positive pressure environment in the micro-positive pressure cavity is 0.8 bar, the maximum cooking temperature can reach 115°C. At this time, the cooking effect is better, the product maturity is higher, and the steam utilization rate is also higher. The top feed port of the tank structure 1 is connected to a feed positive pressure air shutoff device 3, and the feed positive pressure air shutoff device 3 is connected to the previous process equipment for feeding grains into the tank structure 1. The bottom discharge port of the tank structure 1 is connected to a discharge positive pressure air shutoff device 4. The discharge positive pressure The air shutoff 4 is connected to the downstream process equipment for continuous unloading of grains. In the continuous production process of grains, the feed port is generally connected to the elevator, and the discharge port is generally directly connected to the tablet press. The setting of the feed positive pressure air shutoff 3 and the discharge positive pressure air shutoff 4 can reduce the steam leakage in the tank structure 1 during continuous production, thereby achieving better pressure building and pressure maintenance in the tank structure 1 during work, because the positive pressure air shutoff is made of stainless steel as a whole, the rotor, cylinder, and end cover are all precision-machined, with high matching accuracy and small rotor runout. A modified PTFE sealing strip is used between the rotor and the cylinder, which has good sealing, long service life, and little wear on the cylinder. Therefore, the positive pressure air shutoff used can make the overall sealing of the cooking environment good. , while feeding and discharging, the steam leakage can be effectively reduced. With the continuous introduction of steam, a slight positive pressure can be generated and maintained in the cooking equipment. At the same time, good airtightness also greatly reduces the possibility of steam backflowing to the elevator above the feed and the tablet press below, protecting the upstream and downstream equipment and greatly reducing steam energy consumption. Therefore, even if the air shut-off device has a theoretical steam consumption, it can still ensure that the overall equipment is in a stable and airtight working state. At least two groups of safety pressure relief devices are installed on the top of the tank structure 1 to ensure the safe operation of the equipment. At least one group of safety pressure relief devices is a mechanical pressure door pressure relief device 5. At this time, the setting of the safety pressure relief device is to ensure the pressure in the tank structure 1 of the cooking equipment The maximum pressure does not exceed the maximum limit, such as the above-mentioned micro-positive pressure is not greater than 0.8 bar, and the setting of at least one set of mechanical pressure door pressure relief device 5 is a double insurance technical solution. Because the grains contain powdery impurities during production, during the long-term operation of the equipment, although ordinary safety pressure relief devices are widely used, there is a risk that the pressure relief channel will be blocked by powdery impurities. For example, when the pressure in the tank structure 1 reaches the maximum limit, an ordinary safety pressure relief device is used, such as a standard safety valve 6. Even if the standard safety valve 6 completes the opening action, if blockage occurs, it may be difficult to achieve the purpose of opening pressure relief, and it is also not easy to clean. The mechanical pressure door pressure relief device 5 can play the role of the last line of defense and is also easier to clean.

[0049] The tank structure 1 includes a top cover 11, a lower hopper 12, an intermediate section 13 and a steam adding section 14. The top of the top cover 11 is used to install a feed positive pressure air lock 3, and a top level device 15 is also installed thereon for measuring the storage material level to control the feed of the cooking equipment. The circular outlet of the lower hopper 12 is used to connect the discharge positive pressure air lock 4 through a transition connecting section 16. The setting of the transition connecting section 16 can facilitate the replacement and maintenance of the discharge positive pressure air lock 4 when the subsequent production capacity increases. Because if the production capacity increases, the model of the discharge positive pressure air lock 4 will also be replaced. At this time, the inlet size of the discharge positive pressure air lock 4 will change. If the lower hopper 12 is directly connected to the discharge positive pressure air lock 4, it is necessary to redesign the lower hopper 12, which is more troublesome. Therefore, by adapting transition connecting sections 16 of different sizes, the lower hopper 12 can be kept unified and standardized management can be achieved. The inlet of the existing air lock is square. If the lower hopper 12 is directly connected to the air lock, then the lower hopper 1 2 must be designed to be round to square. The biggest problem with the round to square is that the structural strength is not as good as the cone, and it also increases the difficulty of production. The middle section 13 and the steam adding section 14 are located between the top cover 11 and the lower hopper 12, and respectively include a group of middle standard units and a group of steam adding standard units, and the middle standard units and the steam adding standard units are connected between the top cover 11 and the lower hopper 12 in a building block-like combination. The middle standard unit is used to increase the storage capacity. If the customer has high production capacity requirements, the combination can increase the storage capacity by configuring multiple middle sections 13. The steam adding standard unit is used to install the steam adding pipeline 2, and a layer of steam adding pipeline 2 is installed in the steam adding standard unit. At this time, if the customer does not consider the energy consumption of steam, but emphasizes the requirements of high degree of maturation and high cooking temperature, it can be achieved by configuring more sections of steam adding standard units or changing the single-layer steam adding to the double-layer steam adding, so as to have better flexibility, and the standardized parts assembly installation manufacturing, transportation and installation are also more convenient.

[0050] like Figure 3 As shown, it is a schematic diagram of the structure of a steam adding standard unit with a double-layer steam adding pipeline 2, such as Figure 4 To distinguish Figure 1 The steam addition pipeline 2 is located at the upper part of a structural schematic diagram of a steam addition standard unit, and each standard part of the tank structure 1 is made of high-quality thickened 304 stainless steel whole plate, with only 1 to 2 splicing welds, and the welds are full welded with large grooves, so the overall strength is higher and can withstand an internal pressure of more than 1.5 bar.

[0051] The steam adding standard unit is also equipped with a steam adding level meter 17 and a steam adding temperature sensor 18. The steam adding level meter 17 is located above the steam adding pipe 2 and is used to detect whether the grain level is higher than the steam adding pipe 2. The steam adding temperature sensor 18 is used to detect the real-time temperature of the grain steaming. The steam inlet of the tank structure 1 is connected to a proportional control valve 112 for controlling the steam entry speed. The top cover 11 and the transition connecting section 16 are also equipped with a top temperature sensor 19 and a bottom temperature sensor 110, which are used to display the cooking temperature at the top and bottom of the tank structure 1 as a basis for judging the heating uniformity.

[0052] Example 2

[0053] like Figure 5-7As shown, a large-scale building block type micro-positive pressure cooking equipment, in this embodiment, is further limited on the basis of embodiment 1, the mechanical pressure door pressure relief device 5 includes a mounting base 51, a valve body 52, a valve core 53, a lever 54, and a counterweight 55, the bottom end flange of the valve body 52 is butted with the top end flange of the pressure relief port, and the mounting base 51, the valve body 52 and the pressure relief port are fixed by connecting bolts and connecting nuts locked on the connecting bolts, a group of O-rings 56 are installed at the top opening of the valve body 52, and a group of valve cores hingedly installed on one side of the valve body 52 are installed. 53 is used to rotate and cover the valve body 52, and is mechanically sealed by crimping on the O-ring 56. The top side of the valve core 53 is connected to a group of levers 54. The levers 54 are sequentially provided with a plurality of adjustment hole suspension positions 57 along the extension direction of the force arm. The counterweight block 55 is suspended and installed at different adjustment hole suspension positions 57 to adjust the pressure of the valve core 53 covering and sealing the valve body 52 in different gears, thereby controlling the discharge pressure of the pressure relief port. This mechanical pressure relief adjustment structure is not only low in cost, but also convenient in maintenance. At the same time, when setting the discharge pressure, the pressure relief pressure can be adjusted by the pressure relief valve core 53. When pressure is applied, the counterweight block 55 only needs to be directly suspended at the adjustment hole installation position corresponding to the gear position, without the need for time-consuming and labor-intensive manual adjustment and displacement, and is more convenient. That is, for example, when four groups of adjustment hole suspension positions 57 are set along the extension direction of the lever arm, these four groups of adjustment hole suspension positions 57 can be classified into four gear positions, and the adjustment hole suspension position 57 at the far end of the lever arm 54 can correspond to the high discharge pressure gear position. The counterweight block 55 of the same weight suspended and installed here has a greater pressure than the adjustment hole suspension position 57 at the proximal end, and after the counterweight block 55 is suspended and installed at the adjustment hole suspension position 57 , there is no need to manually adjust the position on the lever 54 accurately, thus saving the time for manual adjustment and shifting, which is more time-saving and labor-saving. Therefore, the division of gears can greatly improve the accuracy and speed of manual operation, that is, each time the weight is suspended, the personnel only need to suspend the counterweight block 55 directly on the suspension position 57 of the adjustment hole corresponding to the gear, and there is no need for manual time-consuming precision adjustment of the position, which is more time-saving and labor-saving. After the installation is completed, when the pressure in the tank reaches the discharge pressure, the valve core 53 and the lever 54 will be pushed upward, and the pressure relief port can discharge the pressure through the opening at the top of the valve body 52.

[0054] The mechanical pressure door pressure relief device 5 also includes an air suction hood 58 and a guide frame 59. The air suction hood 58 is positioned on the mounting base 51 through mounting columns 595 distributed on the periphery of the valve body 52. ​​The expanded end of the air suction hood 58 is arranged toward the valve body 52, and the contracted end of the air suction hood 58 is arranged away from the valve body 52 and connected to the fan through a pipeline, so that when the grain is steamed, when the tank reaches the discharge pressure and the steam is emptied, the emptied steam can be guided and discharged by the air suction hood 58, so as to ensure the clean environment in the factory and avoid the influence of the diffused steam on the factory building and the equipment and personnel in the factory building. In addition, since the mounting columns 595 are distributed on the periphery of the valve body 52 and are the same structure as the valve body 52 installed on the mounting base 51, it can be a batch assembly processing part, which is convenient for assembly, production, maintenance and replacement.

[0055] The guide frame 59 is fixed on the mounting base 51, and two sets of guide plates 590 are installed on the guide frame 59, which are arranged opposite to each other and have an adjustment gap. The lever 54 is limited in the adjustment gap to keep the horizontal direction of the lever 54 constant during pressure relief. Therefore, when the plate-shaped lever 54 is lifted up by pressure relief, the guide plates 590 are limited on both sides of the plate-shaped lever 54, so that the lever 54 will not shake horizontally, thereby ensuring that the valve core 53 can accurately return to the original position after the pressure relief is completed, thereby ensuring the sealing performance;

[0056] The guide plate 590 is provided with a stepped countersunk hole for the end of the locking bolt to penetrate into. The screw rod of the locking bolt passes through the stepped countersunk hole and the plate surface of the guide plate 590 is locked and pressed onto the guide frame 59 through the locking nut. Since the end of the locking bolt penetrates into the stepped countersunk hole, it will not affect the guiding and limiting fit between the plate surface of one side of the guide plate 590 and the plate surface of the lever 54. Moreover, the plate surface of the other side of the guide plate 590 is pressed and locked with the guide frame 59 through the cooperation of the locking bolt and the locking nut, so it is also convenient to adjust.

[0057] In order to improve the positioning stability of the guide frame 59 and facilitate the combined batch rapid assembly positioning, the guide frame 59 can be provided to include a bottom plate 591 and a top plate 592 positioned on the mounting column 595. The bottom plate 591 is fixed on the mounting base 51, and two groups of guide vertical plates 593 for correspondingly mounting the two groups of guide plates 590 are detachably connected between the bottom plate 591 and the top plate 592. A group of limiting plates 594 is also provided below the top plate 592. The limiting plates 594 are limitedly mounted on the mounting column 595 by nuts, and are used to constrain the highest position of the lever 54 to prevent the pressure door from opening excessively. In addition, since the guide vertical plates 593 are detachably connected between the bottom plate 591 and the top plate 592, Therefore, after receiving the device, the customer can flexibly adjust the installation position of the guide vertical plate 593 according to the needs of the installation position of the counterweight block 55 in the actual working conditions, that is, it can be the position shown in the figure, or it can be the mirror image installation position of the guide vertical plate 593 on the bottom plate 591 in the figure. The two ends of the guide vertical plate 593 are connected to the long waist holes of the bottom plate 591 and the top plate 592 by screw locking, so as to complete the detachable connection between the top plate 592, the bottom plate 591, and the guide vertical plate 593. Therefore, when it is necessary to fine-tune the gap width between the two sets of guide plates 590, the screws can be directly loosened to adjust the position of the screws in the long waist holes of the bottom plate 591 and the top plate 592, and the adjustment is also more convenient.

[0058] Example 3

[0059] like Figure 8-11As shown, a large-scale building block type micro-positive pressure steaming equipment is further limited on the basis of Example 2 in this embodiment. The steam adding pipeline 2 includes a T-shaped steam drum 21, a steam drum support 22, and a steam ring 23. One end of the vertical end of the T-shaped steam drum 21 is fixedly connected to the inner wall of the tank structure 1 and docked with the steam inlet 111 of the tank structure 1 for steam entry. The two ends of the horizontal end are provided with clamping plates 24 and supported by two groups of steam drum support members 22. The steam drum support members 22 are fixedly connected to the inner wall of the tank structure 1. The top of the drum 21 is provided with two sets of limiting side plates for limiting the positions on both sides of the card plate 24, so as to ensure that the T-shaped drum 21 will not deviate and can always position the support on the drum support 22. The card plate 24 and the limiting side plates are also provided with long waist holes 25. The stainless steel bolts 26 pass through the long waist holes 25 of the T-shaped drum 21 and the drum support 22 and are loosely connected with the stainless steel metal anti-loosening nuts, so as to allow the T-shaped drum 21 and the drum support 22 to be finely adjusted in the horizontal direction, thereby preventing the equipment from being started due to The T-shaped steam drum 21 is heated faster than the tank structure 1, and the thermal expansion stress is generated, causing the tank structure 1 to deform. That is, when the T-shaped steam drum 21 is deformed relative to the tank structure 1, the stress will not be directly applied to the tank structure 1 due to the locking fixation, but only because the stainless steel bolts 26 are loosely connected in the long waist hole 25, the T-shaped steam drum 21 can have a space margin for horizontal sliding adjustment relative to the steam drum support 22. At this time, the stainless steel bolts 26 are equivalent to connecting pins, which play a role of insurance, and the T-shaped steam drum 21 is fixed to the tank structure 1. , the drum support 22 is connected, but does not affect the horizontal sliding between the two. The steam ring 23 is at least one group, and is connected to the T-shaped drum 21 through the steam inlet flange. A number of steam outlet holes are evenly opened on both sides and the bottom of the steam coil of the steam ring 23 to uniformly add steam to the tank structure 1. The diameter of the T-shaped drum 21 is larger than the diameter of the steam ring 23, thereby ensuring that the steam entering the steam coil is sufficient and uniform. At the same time, the overall assembly design is adopted, which is more convenient to manufacture, install and maintain.

[0060] The steam ring 23 is provided with three groups, namely, an outer steam ring 231, a middle steam ring 232, and an inner steam ring 233, which are coaxial and distributed in sequence from the outside to the inside. Each group of steam rings 23 has two groups of symmetrically distributed steam inlet flanges connected to the T-shaped steam drum 21. At this time, the steam directly enters the steam ring 23 from the T-shaped steam drum 21 through the two symmetrically distributed steam inlet flanges, accelerating the diffusion in the steam ring 23, thereby improving the effect of uniform heating of the steam entering the tank structure 1, and a group of supporting beams 27 are also fixed in the tank structure 1, and steam ring supports 28 are installed on the supporting beams 27. The steam ring 23 is reinforced and positioned on the supporting beams 27 by corresponding steam ring supports 28, thereby ensuring that the steam ring 23 is firmly installed, and allowing maintenance personnel to directly step on the steam ring 23 to complete the maintenance work. In order to reduce the difficulty of maintenance of the steam ring 23, an outer steam ring 231 and a middle steam ring 232 can be provided. They are respectively connected by two groups of identical half rings through butt flanges. In actual applications, the pipe diameter distribution design method of the steam addition pipe 2 is as follows: Take the flow design of 1000kg / h as an example: the steam inlet 111 is a DN100 standard flange, the inner diameter of the T-type steam drum 21 is 102mm, and there are three groups of steam rings 23, which are coaxially arranged in sequence on the outer, middle and inner sides. The three circles of steam coils divide the entire tank body into three areas on the transverse cross-sectional circle, and each steam coil is responsible for the steam supply of one area. In terms of area, the areas responsible for the outer, middle and inner three circles of steam coils account for 57%, 29% and 14% respectively. According to the area ratio, the inner diameters of the outer, middle and inner three circles of steam coils are selected to be 53mm, 42mm and 28mm respectively. Compared with the T-type steam drum 21, the actual flow area of ​​the outer, middle and inner three circles of steam coils is twice that of the flow area of ​​the T-type steam drum 21, thereby ensuring uniform and sufficient supply of steam.

[0061] Example 4

[0062] A steam addition control method for a large-scale building block type micro-positive pressure steaming equipment, based on the large-scale building block type micro-positive pressure steaming equipment, comprises the following steps:

[0063] First, the grains in the soaking bin of the preceding process equipment are transported by the elevator and sent into the tank structure 1 through the feed positive pressure air shutoff device 3 to start feeding. When the grains submerge the steam adding pipe 2 in the steam adding section 14, the steam adding level sensor 17 detects the level signal and outputs a switch signal to the control system. The control system then controls the proportional control valve 112 to open to introduce steam into the tank structure 1. At the same time, the control system has a cooking set temperature input by the user. For example, the set temperature is 110°C. The control system monitors the temperature of the steam adding section 14 in real time through the steam adding temperature sensor 18. When the steam adding temperature sensor 18 detects a temperature lower than the set temperature, the opening of the proportional control valve 112 increases to add more steam into the tank structure 1, and the cooking temperature begins to rise. When the temperature at the steam adding temperature sensor 18 reaches or When the set temperature is exceeded, the opening of the proportional control valve 112 decreases to limit the amount of steam added. Eventually, the opening of the proportional control valve 112 reaches a balance to ensure that the actual cooking temperature is maintained within the set temperature ±1°C range. After the initial cooking preheating is completed, the tablet press of the subsequent process equipment is started. At this time, the discharge positive pressure air shutoff device 4 begins to discharge material, and continuous production of the production line is carried out until the grain in the infiltration bin of the previous process equipment is empty. The control system controls the feed positive pressure air shutoff device 3 to stop feeding, and the discharge positive pressure air shutoff device 4 continues to unload material, which will gradually reduce the material level in the cooking equipment. When the grain is lower than the steam addition pipeline 2 of the steam addition section 14, the steam addition material level device 17 detects the material level signal, and the control system controls the proportional control valve 112 to close, steam addition stops, the discharge positive pressure air shutoff device 4 completes discharging, and production ends.

[0064] At this time, the steam addition control adopts the closed-loop PID automatic control of the proportional control valve + temperature sensor. The temperature fluctuation can be controlled within ±1°C, the cooking temperature is more stable, the heating is more uniform, no manual operation is required, and the degree of automation is higher. At the same time, by collecting the signal of the steam level device 17, the automatic opening and closing of the steam addition during the startup and shutdown process can be realized, and the degree of automation is also higher.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large-scale building block type micro-positive pressure cooking equipment, characterized in that: The invention comprises a tank structure (1) formed by modular assembly and connection, into which steam is added through a steam adding pipe (2), and a micro-positive pressure cavity is formed in the tank structure (1); the top feed port of the tank structure (1) is connected to a feed positive pressure air shutoff device (3), and the feed positive pressure air shutoff device (3) is connected to an infiltration bin of a preceding process equipment for feeding grain into the tank structure (1); the bottom discharge port of the tank structure (1) is connected to a discharge positive pressure air shutoff device (4), and the discharge positive pressure air shutoff device (4) is connected to a tablet press of a subsequent process equipment for continuous discharge of grain; the top of the tank structure (1) is also equipped with at least two groups of safety pressure relief devices for ensuring safe operation of the equipment, and at least one group of safety pressure relief devices is a mechanical pressure door pressure relief device (5); The tank structure (1) comprises a top cover (11), a lower hopper (12), an intermediate section (13) and a steam adding section (14); the top of the top cover (11) is used to install a feed positive pressure air lock (3); the circular outlet of the lower hopper (12) is used to connect to a discharge positive pressure air lock (4) via a transition connecting section (16); the intermediate section (13) and the steam adding section (14) are located between the top cover (11) and the lower hopper (12), and respectively comprise at least one group of intermediate standard units and at least one group of steam adding standard units; the intermediate standard units and the steam adding standard units are connected between the top cover (11) and the lower hopper (12) in a building block-like combination; the intermediate standard units are used to increase the storage capacity; the steam adding standard units are used to install a steam adding pipeline (2); and at least one layer of steam adding pipeline (2) is installed in each group of steam adding standard units; The steam adding pipeline (2) comprises a T-shaped steam drum (21), a steam drum support (22), and a steam ring (23); one end of the vertical end of the T-shaped steam drum (21) is fixedly connected to the inner wall of the tank structure (1) and butted against the steam inlet (111) of the tank structure (1) to allow steam to enter; two ends of the horizontal end of the T-shaped steam drum are provided with clamping plates (24) and supported by two groups of steam drum support members (22); the steam drum support member (22) is fixedly connected to the inner wall of the tank structure (1), and two groups of clamping plates (24) are provided on the top of the steam drum support member for limiting the position of the clamping plates (24) The clamping plate (24) and the limiting side plates are further provided with long waist holes (25), and the stainless steel bolts (26) pass through the long waist holes (25) of the clamping plate (24) and the limiting side plates and are loosely connected with the stainless steel metal anti-loosening nuts. The steam ring (23) is at least one group, and is connected to the T-shaped steam drum (21) through the steam inlet flange. A plurality of steam outlet holes are evenly opened on both sides and the bottom of the steam coil of the steam ring (23), and the pipe diameter of the T-shaped steam drum (21) is larger than the pipe diameter of the steam ring (23).

2. A large-scale building block type micro-positive pressure cooking equipment according to claim 1, characterized in that: The mechanical pressure valve pressure relief device (5) comprises a mounting base (51), a valve body (52), a valve core (53), a lever (54), and a counterweight (55). The bottom flange of the valve body (52) is butted against the top flange of the pressure relief port, and the mounting base (51), the valve body (52), and the pressure relief port are fixed by connecting bolts and connecting nuts locked on the connecting bolts. A group of O-rings (56) are installed at the top opening of the valve body (52), and a group of hingedly mounted on the valve body (52) are provided. ) is used for rotating and covering the valve body (52), and is mechanically sealed by crimping on the O-ring (56). The top side of the valve core (53) is connected to a group of levers (54). The levers (54) are provided with a plurality of groups of adjustment hole suspension positions (57) in sequence along the extension direction of the force arm. The counterweight (55) is suspended and installed at different adjustment hole suspension positions (57) to divide the pressure of the gear adjustment valve core (53) covering and sealing the valve body (52).

3. A large-scale building block type micro-positive pressure cooking equipment according to claim 2, characterized in that: The mechanical pressure valve pressure relief device (5) further comprises an air suction hood (58) and a guide frame (59); the air suction hood (58) is positioned on the mounting base (51) via mounting columns (595) distributed on the periphery of the valve body (52); one end of the air suction hood (58) is arranged toward the valve body (52); and one end of the air suction hood (58) is arranged away from the valve body (52) and connected to the fan via a pipeline; The guide frame (59) is fixed on the mounting base (51), and two sets of guide plates (590) are mounted on the guide frame and are arranged opposite to each other and have an adjustment gap. The lever (54) is limited in the adjustment gap to keep the horizontal direction of the lever (54) constant when the pressure is released. The guide plate (590) is provided with a stepped countersunk hole for the end of the locking bolt to penetrate, and the screw rod of the locking bolt passes through the stepped countersunk hole and the plate surface of the guide plate (590) is locked and pressed onto the guide frame (59) through a locking nut.

4. A large-scale building block type micro-positive pressure cooking equipment according to claim 3, characterized in that: The guide frame (59) comprises a bottom plate (591) and a top plate (592) positioned on the mounting column (595); the bottom plate (591) is fixed on the mounting base (51), and two groups of guide vertical plates (593) for correspondingly mounting the two groups of guide plates (590) are detachably connected between the bottom plate (591) and the top plate (592); a group of limiting plates (594) are also arranged below the top plate (592); the limiting plates (594) are limitedly mounted on the mounting column (595) by nuts, and are used to constrain the lever (54) to be lifted to the highest position.

5. The large-scale building block type micro-positive pressure cooking equipment according to claim 1, characterized in that: The steam ring (23) is provided with three groups, namely an outer steam ring (231), a middle steam ring (232), and an inner steam ring (233) which are coaxial and sequentially distributed from the outside to the inside. Each group of steam rings (23) has two groups of symmetrically distributed steam inlet flanges connected to the T-shaped steam drum (21). A group of supporting crossbeams (27) is also fixed in the tank structure (1). A steam ring support member (28) is installed on the supporting crossbeam (27). The steam ring (23) is reinforced and positioned on the supporting crossbeam (27) by the corresponding steam ring support member (28). The outer steam ring (231) and the middle steam ring (232) are respectively provided by two groups of identical half rings connected by butt flanges.

6. A large-scale building block type micro-positive pressure cooking equipment according to any one of claims 1 to 5, characterized in that: The top cover (11) is also provided with a top material level meter (15) for measuring the storage material level to control the feeding of the cooking equipment.

7. A large-scale building block type micro-positive pressure cooking equipment according to claim 6, characterized in that: The steam adding standard unit is also equipped with a steam adding level meter (17) and a steam adding temperature sensor (18). The steam adding level meter (17) is located above the steam adding pipe (2) and is used to detect whether the grain material level is higher than the steam adding pipe (2). The steam adding temperature sensor (18) is used to detect the real-time temperature of the grain steaming. The steam inlet of the tank structure (1) is connected to a proportional control valve (112) for controlling the steam entry speed. The top cover (11) and the transition connecting section (16) are also equipped with a top temperature sensor (19) and a bottom temperature sensor (110) for displaying the cooking temperature at the top and bottom of the tank structure (1) as a basis for judging the heating uniformity.

8. A steam addition control method for a large-scale building block type micro-positive pressure steaming equipment, based on the large-scale building block type micro-positive pressure steaming equipment as claimed in claim 7, characterized in that: The steps include: First, the grains in the soaking bin of the preceding process equipment are transported by the elevator and sent into the tank structure (1) through the feed positive pressure air shutoff device (3) to start feeding. When the grains flood the steam adding pipe (2) in the steam adding section (14), the steam adding material level sensor (17) detects the material level signal and outputs a switch signal to the control system. The control system then controls the proportional control valve (112) to open to allow steam to enter the tank structure (1). At the same time, the control system has a steaming set temperature input by the user. The control system monitors the temperature of the steam adding section (14) in real time through the steam adding temperature sensor (18). When the temperature detected by the steam adding temperature sensor (18) is lower than the set temperature, the opening of the proportional control valve (112) increases to add more steam into the tank structure (1). The steaming temperature begins to rise. When the temperature at the steam adding temperature sensor (18) reaches or exceeds the set temperature, the steam adding temperature sensor (18) increases. When the temperature is set, the opening of the proportional control valve (112) decreases to limit the amount of steam added. Finally, the opening of the proportional control valve (112) reaches a balance to ensure that the actual cooking temperature is maintained within the range of ±1°C of the set temperature. After the initial cooking preheating is completed, the tablet press of the downstream process equipment is started. At this time, the discharge positive pressure air shutoff device (4) starts to discharge material, and the production line is continuously produced until the grain in the soaking bin of the upstream process equipment is empty. The control system controls the feed positive pressure air shutoff device (3) to stop feeding, and the discharge positive pressure air shutoff device (4) continues to discharge material, which will gradually reduce the material level in the cooking equipment. When the grain is lower than the steam addition pipeline (2) of the steam addition section (14), the steam addition material level device (17) detects the material level signal, and then the control system controls the proportional control valve (112) to close, steam addition stops, and the discharge positive pressure air shutoff device (4) completes discharging, and production ends.

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