Bean curd production line

Abstract

The utility model discloses a production line of old bean curd of rushing pulp, including the chain conveyer belt for conveying tray, the left side terminal of chain conveyer belt and the left side initial end of intermittent conveying device are installed with tray transfer device, the right side below of chain conveyer belt is installed with control box, and the PLC control system is installed in control box, the right end of chain conveyer belt is installed with pulp device, and the middle part is installed with heat preservation bin, the intermittent conveying device is used for intermittent conveying basket body, and the top includes the basket area of change, three -stage squeezing device, the basket area of cover, and the turnover device from left to right. The utility model replaces the production mode of manual handling bean curd, and realizes the accurate control of coagulating agent addition amount, and the pulp liquid thickness is consistent, and the squeezing time is unified, and the product hardness consistency improves, avoids the breakage of bean curd caused by manual handling, eliminates the extrusion friction of manual operation to the surface of bean curd, realizes the industrialization continuous production demand.

Description

Technical Field

[0001] This utility model relates to the field of tofu processing and production technology, and in particular to a production line for making firm tofu. Background Technology

[0002] The process of making firm tofu involves three steps: first, making soy milk by grinding soybeans; second, coagulating the soy milk into a gel containing a large amount of water under the combined action of heat and a coagulant; and third, pressing and shaping the tofu using physical processes. The coagulation process is crucial to the texture of the tofu, while pressing and shaping are key steps in determining its firm texture and rich soybean aroma. The pressing conditions require strict control over pressure, time, temperature, and the pressing tools used.

[0003] Traditional tofu production lines mostly rely on manual handling and simple mechanical mixing of soy milk and coagulant. The mixing ratio depends on operator experience, which easily leads to problems such as excessive or insufficient coagulant. The flow rate of the soy milk injection is difficult to match with the tray's travel speed, resulting in uneven soy milk distribution, large fluctuations in tofu thickness, and affecting the consistency of subsequent pressing. Traditional pressing relies on manual handling of tofu curds to pressing baskets, using heavy stacking or single-stage pressure pressing, which is difficult to meet the standardized requirements of industrial production. The basket turning and transfer processes still require manual intervention, which is labor-intensive and easily causes tofu breakage, limiting capacity increases. Utility Model Content

[0004] The purpose of this invention is to provide a production line for making fermented tofu, which solves the problems of traditional fermented tofu production, such as handling throughout the process, uneven injection, temperature control failure, inefficient pressing, and excessive reliance on manual labor.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A tofu production line includes a chain conveyor belt for conveying trays. A tray transfer device is installed at the left end of the chain conveyor belt and the left initial end of an intermittent conveyor. The tray transfer device automatically pushes the trays from the chain conveyor belt onto the intermittent conveyor. A control box containing a PLC control system is installed below the right side of the chain conveyor belt. A soy milk dispensing device is installed at the right end of the chain conveyor belt, and a heat-insulating silo is installed in the middle. The soy milk dispensing device is used to mix soybean milk and coagulant into a slurry that flows into the tray. The heat-insulating silo... The silo is covered with a stainless steel cover to keep the slurry in the tray warm. The intermittent conveying device is used to intermittently convey the basket. The top includes a basket changing area, a three-stage pressing device, a basket covering area, and a turning device from left to right. The basket changing area is used to manually pour the solidified tofu curd in the tray into the basket. The three-stage pressing device automatically squeezes the slurry out of the tofu curd in the basket to form firm tofu. The basket covering area is used to manually cover the basket with a large basket. The turning device is used to automatically turn the large basket and the basket together so that the firm tofu falls into the large basket for transfer.

[0007] Preferably, the slurry feeding device includes a slurry tank, a coagulant tank, an inlet pipe, a slurry outlet pipe, a coagulant outlet pipe, an electric butterfly valve, a converging pipe, a support pipe, and a rotating dispensing device. The slurry tank and the coagulant tank are fixed above the chain conveyor belt by a steel pipe frame. Liquid level sensors are installed inside the slurry tank and the coagulant tank. An inlet pipe is installed at the top of both the slurry tank and the coagulant tank. A slurry outlet pipe is installed at the bottom of the slurry tank. A coagulant outlet pipe is installed at the bottom of the coagulant tank. An electric butterfly valve is installed on the slurry outlet pipe and the coagulant outlet pipe respectively. The ends of the slurry outlet pipe and the coagulant outlet pipe are connected to the converging pipe. A horizontal support pipe is connected to the bottom of the converging pipe. A downward-facing outlet is opened at the end of the support pipe. A rotating dispensing device is installed at the outlet position of the support pipe.

[0008] Preferably, the rotating liquid outlet device includes a rotating sleeve, cylindrical heads, and a connecting port. The rotating sleeve is fitted onto the support tube and rotates in a sealed manner along the support tube. Four cylindrical heads are welded at equal angles on the outer wall of the rotating sleeve, and two coaxial cylindrical heads have connecting ports that can communicate with the liquid outlet through rotation.

[0009] Preferably, the pallet transfer device includes a transfer support frame, a fixed plate, a rodless cylinder, a guide shaft, a slider, and a first transfer plate. The transfer support frame is vertically fixed to the upper left side of the chain conveyor belt and the intermittent transfer device. Vertical fixed plates are welded to the front and rear of the transfer support frame. A rodless cylinder and a guide shaft are vertically installed between the two fixed plates. The slider driven by the rodless cylinder is slidably connected along the guide shaft. The bottom of the slider is fixed with the first transfer plate.

[0010] Preferably, the intermittent conveying device includes support bars, cylinder A, connecting plate, second transmission plate, support roller, basket pusher bar, central shaft, and limiting shaft. Two U-shaped support bars are welded to the top of the intermittent conveying device in the left and right directions to support the basket body. Cylinder A is fixed to the top surface of the intermittent conveying device in the left and right directions. A connecting plate in the front and back directions is fixed to the right output end of cylinder A. The second transmission plate in the left and right directions is fixed to both ends of the connecting plate. The second transmission plate is supported by the support roller to keep it horizontal. The support roller is installed on the front and back side plates of the intermittent conveying device. Basket pusher bars are evenly distributed on the second transmission plate. The middle of the basket pusher bar is installed to the side of the second transmission plate through the central shaft. The basket pusher bar is lighter at the top and heavier at the bottom, and keeps vertical by its own weight. A limiting shaft is fixed next to the basket pusher bar on the side of the second transmission plate.

[0011] Preferably, the three-stage pressing device includes a cylinder frame, cylinders B, and a pressure plate. The cylinder frame is welded to the top of the intermittent conveying device. Three cylinders B are installed on the cylinder frame from left to right. A horizontal pressure plate is fixed to the output end of the bottom of the cylinders B to squeeze out excess soy milk from the tofu pudding and form tofu.

[0012] Preferably, the flipping device includes a U-shaped groove, a baffle, a rotating shaft, a gear, a cylinder C, a rack, a cylinder D, and a push plate. The two U-shaped grooves are horizontal and symmetrical, with the bottom of the groove opening at the same height as the support bar. A baffle is bent at the bottom of the groove opening on the other side. A rotating shaft is fixed to the bottom of the U-shaped groove. Both ends of the rotating shaft are installed with an intermittent conveying device through bearing seats. A gear is fixed to one end of the rotating shaft. A cylinder D is fixed to the intermittent conveying device on the same side as the gear. A rack is fixed to the output end of the cylinder D. The rack and gear drive each other. A cylinder D is fixed to the middle of the right end of the intermittent conveying device. A vertical push plate is fixed to the output end of the cylinder D.

[0013] This utility model has the following beneficial effects:

[0014] This production line utilizes a chain conveyor belt, tray transfer device, and intermittent conveyor to replace manual handling of tofu. An electric butterfly valve, linked to a PLC, controls the flow ratio of soy milk and brine, ensuring precise control of the coagulant dosage and avoiding bitterness or looseness caused by human error. A rotating liquid outlet device, triggered by a tray, ensures that the amount of liquid injected into each tray is strictly synchronized with the conveying speed, resulting in consistent liquid thickness and a uniform foundation for subsequent pressing. Three cylinders (B) progressively increase pressure, simulating a traditional stepped pressurization process, gradually reducing the tofu's moisture content, ensuring uniform pressing time, and improving the consistency of finished product hardness, thus preventing tofu breakage caused by manual handling. A gear and rack drive rotates a U-shaped trough 180°, automatically transferring tofu with a pusher plate, eliminating the squeezing and friction on the tofu surface caused by manual operation and meeting the requirements of continuous industrial production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 This is a schematic diagram of the external structure of the slurry feeding device of this utility model;

[0018] Figure 4 This is a schematic diagram illustrating an application scenario of the tray and rotating sleeve of this utility model;

[0019] Figure 5 This is a schematic diagram of the second application scenario of the tray and rotating sleeve of this utility model;

[0020] Figure 6 This is a schematic diagram of the external structure of the pallet transfer device of this utility model;

[0021] Figure 7 This is a side view of the pallet transfer device of this utility model;

[0022] Figure 8 This is a top view of the intermittent conveying device of this utility model;

[0023] Figure 9 This is a schematic diagram showing the connection between the support roller and the pusher bar of this utility model and the transmission plate;

[0024] Figure 10 This is a side view of the intermittent conveying device of this utility model;

[0025] Figure 11 This is a schematic diagram of the external structure of the flipping device of this utility model;

[0026] Figure 12 This is a side view of the flipping device of this utility model;

[0027] Icons: 1. Chain conveyor belt; 11. Pallet; 12. Slurry feeding device; 121. Slurry tank; 122. Coagulant tank; 123. Liquid inlet pipe; 124. Slurry outlet pipe; 125. Agent outlet pipe; 126. Electric butterfly valve; 127. Converging pipe; 128. Support pipe; 1281. Liquid outlet; 129. Rotary liquid outlet device; 1291. Rotating sleeve; 1292. Cylindrical head; 1293. Connecting port; 13. Insulated chamber; 2. Pallet transfer device; 21. Transmission support frame; 22. Fixing plate; 23. Rodless cylinder; 24. Guide shaft; 25. Slider; 26. First transmission plate; 3. Intermittent conveying device; 301, support bar; 302, cylinder A; 303, connecting plate; 304, second transmission plate; 305, support roller; 306, pusher bar; 307, central shaft; 308, limit shaft; 31, basket changing area; 32, three-stage pressing device; 321, cylinder frame; 322, cylinder B; 323, pressure plate; 33, basket covering area; 34, turning device; 341, U-shaped groove; 342, baffle; 343, rotating shaft; 344, gear; 345, cylinder C; 346, rack; 347, cylinder D; 348, pusher plate; 35, basket body; 36, large basket body. Detailed Implementation

[0028] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figure 1-12 As shown, in this embodiment, the fermented soybean tofu production line includes a chain conveyor belt 1 for conveying trays 11. A tray transfer device 2 is installed at the left end of the chain conveyor belt 1 and the left initial end of the intermittent conveying device 3. The tray transfer device 2 automatically pushes the trays 11 from the chain conveyor belt 1 onto the intermittent conveying device 3. A control box 4 is installed below the right side of the chain conveyor belt 1. A PLC control system is installed inside the control box 4. The control box 4 is wired to the servo motor of the chain conveyor belt 1, and its rotation speed is controlled by the PLC. A slurry feeding device 12 is installed at the right end of the chain conveyor belt 1, and a heat preservation chamber 13 is installed in the middle. The slurry feeding device 12 is used to mix soybean milk and coagulant at 80-85℃ to form a slurry that flows into the trays 11. The heat preservation chamber 13 is a stainless steel cover used to keep the slurry in the trays 11 warm. The insulation maintains the temperature to ensure that the proteins are fully cross-linked to form a dense network, which facilitates the coagulation of the slurry into tofu pudding. The intermittent conveying device 3 is used to intermittently convey the basket 35. The top of the basket includes, from left to right, a basket changing area 31, a three-stage pressing device 32, a basket covering area 33, and a turning device 34. The basket changing area 31 is used to manually pour the coagulated tofu pudding in the tray 11 into the basket 35. The basket 35 is pre-lined with a cloth, and after the tofu pudding is poured in, the cloth is wrapped over the top of the tofu pudding. The three-stage pressing device 32 automatically squeezes out the slurry from the tofu pudding in the basket 35 to form firm tofu. The basket covering area 33 is used to manually cover the basket 35 with a large basket 36. Before covering the large basket 36, the cloth covering the top of the firm tofu is removed. The turning device 34 is used to automatically turn the large basket 36 and the basket 35 so that the firm tofu falls into the large basket 36 for transfer.

[0031] The feeding device 12 includes a slurry tank 121, a coagulant tank 122, an inlet pipe 123, a slurry outlet pipe 124, a dispensing pipe 125, an electric butterfly valve 126, a flow-gathering pipe 127, a support pipe 128, and a rotating dispensing device 129. The slurry tank 121 and the coagulant tank 122 are fixed above the chain conveyor belt 1 by a steel pipe frame. The slurry tank 121 stores soybean milk with a temperature of 80-85℃, and the coagulant tank 122 stores brine. Liquid level sensors are installed inside the slurry tank 121 and the coagulant tank 122. Inlet pipes 123 are installed at the top of both the slurry tank 121 and the coagulant tank 122. Soybean milk and brine are respectively pumped into the slurry tank 121 and the coagulant tank 122 by a water pump. A PLC is connected to the liquid level sensors to adjust the start and stop of the water pump in real time. The slurry tank 121 is equipped with an outlet pipe 124 at the bottom. The bottom of the solidification tank 122 is provided with a dispensing pipe 125. Electric butterfly valves 126 are respectively installed on the slurry dispensing pipe 124 and the dispensing pipe 125. The electric butterfly valves 126 are connected to the control box 4 by wires. The PLC realizes high-precision flow regulation of the two electric butterfly valves 126 through a 4-20mA analog signal, thereby regulating the flow of soy milk and brine, and the flow ratio is 25:1. The ends of the slurry dispensing pipe 124 and the dispensing pipe 125 are connected to the converging pipe 127, so that the soy milk and brine enter the converging pipe 127 by gravity and mix. The bottom of the converging pipe 127 is connected to a horizontal support pipe 128. The end of the support pipe 128 has a downward liquid outlet 1281. A rotating liquid dispensing device 129 is installed at the position of the liquid outlet 1281 of the support pipe 128, and the liquid is injected by the passive rotation of the tray 11 when it passes by.

[0032] The rotating liquid outlet device 129 includes a rotating sleeve 1291, cylindrical heads 1292, and a connecting port 1293. The rotating sleeve 1291 is sleeved on the support tube 128 and rotates in a sealed manner along the support tube 128. Four cylindrical heads 1292 are welded at equal angles on the outer wall of the rotating sleeve 1291. Two coaxial cylindrical heads 1292 have connecting ports 1293 inside, which can communicate with the liquid outlet 1281 by rotation.

[0033] Specifically, such as Figure 4-5As shown, during the process of pallet 11 being conveyed from right to left by the chain conveyor belt 1, the left edge of pallet 11 touches the cylindrical head 1292 without the connecting port 1293 located below, causing the rotating sleeve 1291 to rotate 90°, so that the cylindrical head 1292 with the connecting port 1293 rotates downward and connects with the liquid outlet 1281, allowing the slurry to flow into pallet 11. When the right edge of pallet 11 touches this cylindrical head 1292 with the connecting port 1293, the rotating sleeve 1291 rotates 90°, so that the cylindrical head 1292 without the connecting port 1293 rotates downward again, closing the liquid outlet 1281. When the next pallet 11 passes by, the automatic slurry injection function of pallet 11 is realized. Based on the constant transmission speed of the chain conveyor belt 1, the amount of slurry injected into each pallet 11 is kept consistent, so that the thickness of the subsequent tofu forming can also be kept consistent.

[0034] The pallet transfer device 2 includes a transmission support frame 21, a fixed plate 22, a rodless cylinder 23, a guide shaft 24, a slider 25, and a first transmission plate 26. The transmission support frame 21 is vertically fixed to the upper left side of the chain conveyor belt 1 and the intermittent conveying device 3. Vertical fixed plates 22 are welded to the front and rear of the transmission support frame 21. The rodless cylinder 23 and the guide shaft 24 are vertically installed between the two fixed plates 22. The slider 25 driven by the rodless cylinder 23 is slidably connected along the guide shaft 24 to maintain the stability of the slider 25 when it moves. The first transmission plate 26 is fixed to the bottom of the slider 25. The rodless cylinder 23 outputs a signal through the PLC to make the slider 25 drive the first transmission plate 26 to push the pallet 11 toward the intermittent conveying device 3.

[0035] The intermittent conveying device 3 includes support bars 301, cylinder A 302, connecting plate 303, second transmission plate 304, support roller 305, basket pusher 306, central shaft 307, and limiting shaft 308. Two U-shaped support bars 301 are welded to the top of the intermittent conveying device 3 in the left-right direction to support the basket body 35. Cylinder A 302 is fixed to the top surface of the intermittent conveying device 3 in the left-right direction. The PLC controls the extension and retraction frequency of cylinder A 302 through digital output signals. A connecting plate 303 in the front-back direction is fixed to the right output end of cylinder A 302. Second transmission plates 304 in the left-right direction are fixed to both ends of the connecting plate 303. The second transmission plates 304 are supported by support roller 305 to maintain horizontality. 05 is installed on the front and rear side plates of the intermittent conveying device 3. The second transmission plate 304 has pusher bars 306 evenly distributed on it, which are used to push the basket 35 to move on the support bar 301. The middle part of the pusher bar 306 is installed on the side of the second transmission plate 304 through the central shaft 307, so that the pusher bar 306 can rotate. The pusher bar 306 is lighter at the top and heavier at the bottom, and maintains a vertical state by its own weight. A limit shaft 308 is fixed next to the pusher bar 306 on the side of the second transmission plate 304. The lower part of the pusher bar 306 is obstructed by the limit shaft 308 and can only rotate in the direction of the basket 35. The cylinder A302 pushes the pusher bar 306, and the limit shaft 38 is used to realize the unidirectional push of the basket 35 to the right, realizing the intermittent conveying of the basket 35.

[0036] The three-stage pressing device 32 includes a cylinder frame 321, cylinders B322, and a pressure plate 323. The cylinder frame 321 is welded to the top of the intermittent conveying device 3. Three cylinders B322 are installed on the cylinder frame 321 from left to right. A horizontal pressure plate 323 is fixed to the output end of the bottom of the cylinders B322 to squeeze out excess soy milk from the tofu curd and form tofu.

[0037] Specifically, the PLC controls the extension and retraction frequency of cylinder B322 via digital output signals, matching the rhythm of cylinder A302. This causes cylinder A302 to drive the cylinder rod to retract and extend, pushing the basket 35. Cylinder B322 causes the pressure plate 323 to press down on the tofu inside the basket 35. After a preset time, the pressure plate 323 rises, and cylinder A302 is driven again, forming a cycle. The three cylinders B322 operate at different pressures. Each basket 35 passes through the three cylinders B322 sequentially, receiving pressures of 50N, 100N, and 150N respectively. The total pressing time is 1-2 hours, controlling the tofu's moisture content to 75-80%, forming firm tofu. The pressing time and pressure can be precisely controlled and maintained consistently, achieving an automated pressing process for firm tofu.

[0038] The flipping device 34 includes a U-shaped groove 341, a baffle 342, a rotating shaft 343, a gear 344, a cylinder C345, a rack 346, a cylinder D347, and a push plate 348. The two U-shaped grooves 341 are horizontal and symmetrical. The bottom of the groove opening is at the same height as the support bar 301. A baffle 342 is bent at the bottom of the groove opening on the other side to prevent the basket 35 and the large basket 36 from sliding out of this opening. The rotating shaft 343 is fixed at the bottom of the U-shaped groove 341, and the two ends of the rotating shaft 343 are connected by bearing seats. Installed with the intermittent conveying device 3, a gear 344 is fixed at one end of the rotating shaft 343, and a cylinder D347 is fixed on the intermittent conveying device 3 on the same side as the gear 344. A rack 346 is fixed at the output end of the cylinder D347, and the rack 346 drives the gear 344. A cylinder D347 is fixed in the middle of the right end of the intermittent conveying device 3, and a vertical push plate 348 is fixed at the output end of the cylinder D347 for pushing the flipped basket 35 and the large basket 36 out of the U-shaped groove 341.

[0039] Specifically, the push bar 306 pushes the basket body 35 and the large basket body 36 into the U-shaped groove 341. Cylinders C345 and D347 are controlled by the PLC via digital output signals to adjust their extension and retraction frequency. The stroke of the rack 346 matches the pitch circle circumference of the gear 344, causing the cylinder C345 to drive the gear 344 to rotate 180° during extension and retraction. Figure 11 As shown, the opening of the U-shaped groove 341 into the basket 35 and the large basket 36 is designated as the inlet. The inlet changes from horizontal to upward and then back to horizontal, preventing the baffle 342 from causing the basket 35 and the large basket 36 to fall out of the U-shaped groove 341 during rotation. After rotating 180°, the firm tofu in the basket 35 falls into the large basket 36. Since the pivot is located below the U-shaped groove 341, the height of the basket 35 and the large basket 36 decreases to the moving path of the push plate 348. The cylinder D347 drives the push plate 348 to push the basket 35 and the large basket 36 out of the U-shaped groove 341, transferring the firm tofu. The cylinders D347 and C345 then reset sequentially, saving the physical effort required for manual turning and avoiding damage to the tofu during manual operation.

[0040] The working principle of this invention is as follows: Soy milk at 80-85℃ in the slurry tank 121 is mixed with brine in the coagulant tank 122 at a ratio of 25:1 via an electric butterfly valve 126. A PLC precisely controls the flow rate via a 4-20mA signal to ensure a stable amount of coagulant added. The mixed slurry flows into the support pipe 128 through the convergence pipe 127 and is injected into the tray 11 through the rotating liquid outlet device 129. When the left edge of the tray 11 touches the cylindrical head 1292, the rotating sleeve 1291 rotates 90°, aligning the connecting port 1293 with the liquid outlet 1281 to begin slurry injection; when the right edge of the tray 11 touches the other cylindrical head, the rotating sleeve 1291 resets and closes the liquid outlet, achieving quantitative slurry injection per tray. After injection, the tray enters the insulation chamber 13, where a stainless steel cover maintains the slurry temperature, promoting protein cross-linking to form a dense network structure, and coagulating into tofu pudding. The chain conveyor belt 1 operates at a uniform speed to ensure consistent coagulation time for each tray 11. At the end of the chain conveyor belt 1, the tray 11 is driven by the rodless cylinder 23 of the tray transfer device 2, which slides the first transmission plate 26 along the guide shaft 24, smoothly pushing the tray 11 to the basket changing area 31. The operator pours the solidified tofu curd in the tray 11 into a basket 35 lined with a cloth, wraps it, and sends it into the intermittent conveyor. The PLC-controlled cylinder A302 drives the basket pusher 306 to push the basket to the right, entering the three-stage pressing device 32. The first cylinder B322 applies a pressure of 50N to initially remove the surface slurry from the tofu curd. The second cylinder B322 increases the pressure to 100N to further squeeze out the internal moisture. The third cylinder B322 applies a pressure of 150N, ultimately controlling the moisture content of the tofu to 75-80%. The PLC synchronizes the cylinders A302 and B322, with a pressing time of 1-2 hours, ensuring uniform quality of each batch of tofu. After pressing, the tofu is covered with a cloth in the covered basket area 33, and a large basket 36 is manually placed on top. The basket pusher 306 pushes the basket 35 and the large basket 36 into the U-shaped groove 341 of the turning device 34. Cylinder C345 drives the rack 346 to rotate the gear 344 180°, causing the tofu to fall into the large basket 36. After turning, cylinder D347 drives the pusher plate 348 to push the large basket 36 out of the U-shaped groove, completing the finished product transfer. Cylinders C and D then reset, preparing for the next cycle.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production line for making fermented tofu, comprising a chain conveyor belt (1) for conveying trays (11), wherein a tray transfer device (2) is installed at the left end of the chain conveyor belt (1) and the left initial end of an intermittent conveying device (3), the tray transfer device (2) automatically pushes the trays (11) from the chain conveyor belt (1) onto the intermittent conveying device (3), and a control box (4) is installed below the right side of the chain conveyor belt (1), wherein a PLC control system is installed in the control box (4), characterized in that, The chain conveyor belt (1) is equipped with a slurry feeding device (12) at the right end and a heat preservation chamber (13) in the middle. The slurry feeding device (12) is used to mix soybean milk and coagulant into a slurry that flows into a tray (11). The insulated chamber (13) is a stainless steel cover, used to keep the slurry inside the tray (11) warm. The intermittent conveying device (3) is used for intermittently conveying the basket (35). The top includes, from left to right, a basket changing area (31), a three-stage pressing device (32), a basket covering area (33), and a turning device (34). The basket-changing area (31) is used to manually pour the solidified tofu pudding in the tray (11) into the basket (35). The three-stage pressing device (32) automatically squeezes the liquid out of the tofu curd in the basket (35) to form firm tofu. The basket covering area (33) is used to manually cover the large basket (36) on the basket (35). The flipping device (34) is used to automatically flip the large basket (36) and the basket (35) so that the tofu falls into the large basket (36) for transfer.

2. The tofu production line according to claim 1, characterized in that, The slurry feeding device (12) includes a slurry tank (121), a coagulant tank (122), an inlet pipe (123), a slurry outlet pipe (124), a coagulant outlet pipe (125), an electric butterfly valve (126), a flow-gathering pipe (127), a support pipe (128), and a rotating liquid outlet device (129). The slurry tank (121) and the coagulant tank (122) are fixed above the chain conveyor belt (1) by a steel pipe frame. Liquid level sensors are installed inside the slurry tank (121) and the coagulant tank (122). An inlet pipe (123) is installed on the top of both the slurry tank (121) and the coagulant tank (122). 121) A slurry outlet pipe (124) is provided at the bottom, and a coagulant tank (122) is provided at the bottom with a discharge pipe (125). Electric butterfly valves (126) are installed on the slurry outlet pipe (124) and the discharge pipe (125). The ends of the slurry outlet pipe (124) and the discharge pipe (125) are connected to a flow-gathering pipe (127). A horizontal support pipe (128) is connected to the bottom of the flow-gathering pipe (127). A downward-facing liquid outlet (1281) is opened at the end of the support pipe (128). A rotating liquid outlet device (129) is installed at the liquid outlet (1281) of the support pipe (128).

3. The tofu production line according to claim 2, characterized in that, The rotating liquid outlet device (129) includes a rotating sleeve (1291), cylindrical heads (1292), and a connecting port (1293). The rotating sleeve (1291) is sleeved on the support tube (128) and rotates in a sealed manner along the support tube (128). Four cylindrical heads (1292) are welded at equal angles on the outer wall of the rotating sleeve (1291). Two coaxial cylindrical heads (1292) have connecting ports (1293) inside, which can communicate with the liquid outlet (1281) by rotation.

4. The tofu production line according to claim 1, characterized in that, The pallet transfer device (2) includes a transmission support frame (21), a fixed plate (22), a rodless cylinder (23), a guide shaft (24), a slider (25), and a first transmission plate (26). The transmission support frame (21) is vertically fixed above the left side of the chain conveyor belt (1) and the intermittent transmission device (3). Vertical fixed plates (22) are welded to the front and back of the transmission support frame (21). A rodless cylinder (23) and a guide shaft (24) are vertically installed between the two fixed plates (22). The slider (25) driven by the rodless cylinder (23) is slidably connected along the guide shaft (24). The first transmission plate (26) is fixed at the bottom of the slider (25).

5. The tofu production line according to claim 1, characterized in that, The intermittent conveying device (3) includes a support bar (301), a cylinder A (302), a connecting plate (303), a second transmission plate (304), a support roller (305), a basket pusher (306), a central shaft (307), and a limiting shaft (308). Two U-shaped support bars (301) are welded to the top of the intermittent conveying device (3) in the left and right directions to support the basket body (35). The cylinder A (302) is fixed to the top surface of the intermittent conveying device (3) in the left and right directions. A connecting plate (303) in the front and back directions is fixed to the output end of the cylinder A (302) on the right side. The two ends of the connecting plate (303) are respectively A second transmission plate (304) is fixed in the left-right direction. The second transmission plate (304) is supported by a support roller (305) to keep it horizontal. The support roller (305) is installed on the front and rear side plates of the intermittent conveying device (3). Pushing bars (306) are evenly distributed on the second transmission plate (304). The middle part of the pushing bars (306) is installed on the side of the second transmission plate (304) through a central shaft (307). The pushing bars (306) are light at the top and heavy at the bottom, and are kept vertical by their own weight. A limit shaft (308) is fixed next to the pushing bars (306) on the side of the second transmission plate (304).

6. The tofu production line according to claim 5, characterized in that, The three-stage pressing device (32) includes a cylinder frame (321), cylinders B (322), and a pressure plate (323). The cylinder frame (321) is welded to the top of the intermittent conveying device (3). Three cylinders B (322) are installed on the cylinder frame (321) from left to right. A horizontal pressure plate (323) is fixed at the bottom of the cylinder B (322) to squeeze out excess soy milk from the tofu pudding and form tofu.

7. The tofu production line according to claim 6, characterized in that, The flipping device (34) includes a U-shaped groove (341), a baffle (342), a rotating shaft (343), a gear (344), a cylinder C (345), a rack (346), a cylinder D (347), and a push plate (348). The two U-shaped grooves (341) are horizontal and symmetrical. The bottom of the groove opening is at the same height as the support bar (301). The bottom of the groove opening on the other side is bent with a baffle (342). The rotating shaft (343) is fixed at the bottom of the U-shaped groove (341). The two ends of the rotating shaft (343) are... The shaft (343) is mounted on a bearing seat and an intermittent conveying device (3). A gear (344) is fixed at one end of the shaft (343). A cylinder D (347) is fixed on the intermittent conveying device (3) on the same side as the gear (344). A rack (346) is fixed at the output end of the cylinder D (347). The rack (346) drives the gear (344). A cylinder D (347) is fixed in the middle of the right end of the intermittent conveying device (3). A vertical push plate (348) is fixed at the output end of the cylinder D (347).

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