Pressing production process of dried bean curd and pressing equipment thereof

Abstract

The invention relates to the technical field of dried bean curd manufacturing, in particular to a pressing production process and pressing equipment of dried bean curd. The production process comprises the following steps: S1, preparing materials; s2, preliminary pressing; s3, secondary pressing; s4, pressing for the third time; and S5, dicing and packaging. The pressing equipment comprises a pressing box and a hydraulic assembly, the pressing box comprises a box body and a pressing plate, the hydraulic assembly is vertically connected to the upper side of the pressing plate, the wall of the box body and the interior of the pressing plate are each provided with an auxiliary drainage structure, and when the pressing plate is pressed downwards by the hydraulic assembly, water in the bean curd blanks can be discharged outwards from the top, the side face and the bottom; through step-by-step pressing, the water content of the dried bean curd can be accurately controlled, and different market requirements are met; in the pressing process, water distribution is uniform, the product texture is consistent, and the taste is better; the art parameters are flexible and adjustable, and bean curd products with different dryness degrees can be obtained according to requirements.

Description

Technical Field

[0001] The invention relates to the technical field of dried bean curd production, in particular to a pressing production process of dried bean curd and pressing equipment thereof. Background Art

[0002] Dried tofu is a traditional soy product, and its water content directly affects the taste, texture and shelf life of the product. The traditional production process of dried tofu usually adopts one-time pressing, which makes it difficult to accurately control the water content of the product, resulting in unstable product quality.

[0003] In addition, in the existing pressing equipment, pressure is applied to the top of the tofu to make the water in the tofu flow out from the bottom. This method will cause different dryness and wetness levels at different heights inside the dried tofu, affecting the taste of the dried tofu.

[0004] Therefore, the present application provides a dried tofu pressing production process and pressing equipment thereof, which solves the problems in the prior art that it is difficult to control the moisture content of the dried tofu during the pressing process and the uneven distribution of dryness and wetness inside the dried tofu. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a pressing production process of dried bean curd and a pressing device thereof.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a pressing production process of dried bean curd, comprising the following steps: S1. Preparation: Place the tofu blank into a pressing device and level the surface of the tofu blank for later use; S2. Preliminary pressing: The tofu blank is pressed by a pressing device, the pressing time is T1, the residence time is S1, and the number of pressing times is N1; S3. Secondary pressing: On the basis of the initial pressing, the tofu blank is pressed for the second time by the pressing equipment, the pressing time is T2, the residence time is S2, and the number of pressing times is N2; S4 three times of pressing: on the basis of the secondary pressing, the tofu blank is continued to be pressed by the pressing equipment, the pressing time is T3, the residence time is S3, the pressing number is N3, and the desired dry tofu is obtained; S5. Cutting and packaging: The dried tofu obtained in step S4 is taken out from the pressing device, and the dried tofu is cut and then packaged.

[0007] As an optimization, the pressing times T1, T2 and T3 are 1-10 minutes respectively, the residence times S1, S2 and S3 are 0.5-5 minutes respectively, and the pressing times N1, N2 and N3 are 1-5 times respectively.

[0008] As an optimization, in step S2, the pressure range during the initial pressing process is 0.2-0.5 MPa, in step S3, the pressure range during the secondary pressing process is 0.5-1.0 MPa, and in step S4, the pressure range during the tertiary pressing process is 1.0-1.5 MPa.

[0009] The pressing device comprises a pressing box and a hydraulic assembly, wherein the pressing box comprises a box body and a pressing plate, the hydraulic assembly is vertically connected to the upper side of the pressing plate, and the wall of the box body and the inside of the pressing plate are both provided with auxiliary drainage structures, and when the hydraulic assembly presses the pressing plate downward, the moisture in the tofu blank can be discharged outward from the top, the side and the bottom; A filter membrane is provided on the inner wall of the pressing box, and the auxiliary drainage structure is provided on the inner side of the filter membrane. The auxiliary drainage structure includes a first drain plate, a movable drain plate and a second drain plate which are sequentially arranged from the inside to the outside. A drainage cavity is provided on the outer side of the second drain plate, and a connecting pipe is connected to the drainage cavity and the moving space where the movable drain plate is located. The first drain plate and the second drain plate are respectively provided with a first drainage hole and a second drainage hole, and the movable drain plate is provided with a water drawing channel. When the movable drain plate is in a water drawing state, the water drawing channel is in a negative pressure state and is connected with the first drainage hole. When the movable drain plate is in a drainage state, the water drawing channel is connected with the second drainage hole, and the water in the water drawing channel is discharged outward through the connecting pipe.

[0010] As an optimization, the connecting pipe is connected to the upper part of the drainage cavity, the bottom of the drainage cavity is connected to a drainage pipe, and the drainage pipe is equipped with a water pump; The upper part of the drainage cavity is connected with a negative pressure pipe, and the negative pressure pipe is equipped with a suction pump for sucking water in the connecting pipe.

[0011] As an optimization, a connecting layer is provided on the outer side of the second drainage board, and the connecting layer is equipped with a two-way air pump. When one end of the water-drawing channel is connected with the second drainage hole, the other end of the water-drawing channel is in contact and sealed with the first drainage board, and the two-way air pump inhales air to make the inside of the water-drawing channel in a negative pressure state.

[0012] As an optimization, a water channel is provided inside the movable drain plate, the water channel is connected with a plurality of water-drawing channels, and the water channel is located adjacent to the water-drawing channel and the first drain plate; One end of the water passage is an opening, and the opening can be connected to the connecting pipe.

[0013] As an optimization, the movable area of ​​the movable drain plate is larger than the area of ​​the first drain plate and the area of ​​the second drain plate, the movable drain plate is provided with a push rod, a driving cam is provided inside the pressing box, the driving cam is provided in contact with the push rod, and a return spring is provided on the opposite side of the push rod and the driving cam; The driving cam is equipped with a driving motor. When the long diameter outer end of the driving cam contacts the push rod, it pushes the movable drain plate to be displaced from the first drain plate, and the water inside the water-drawing channel is discharged outward. When the short diameter of the driving cam contacts the push rod, the return spring pushes the movable drain plate to be displaced from the second drain plate, and the water-drawing channel is connected with the first drainage hole to draw water.

[0014] As an optimization, it further includes a fixed bracket, the box body is arranged on the fixed bracket, the hydraulic assembly is fixedly connected to the upper part of the fixed bracket, the hydraulic assembly includes a hydraulic cylinder, and the extended end of the hydraulic cylinder is vertically connected to the pressure plate.

[0015] The advantages of the pressing production process of a dried bean curd of the present invention are as follows: Through step-by-step pressing, the moisture content of dried tofu can be accurately controlled to meet different market demands; the moisture is evenly distributed during the pressing process, the product texture is consistent, and the taste is better; the process parameters are flexible and adjustable, and tofu products of different dryness can be obtained according to demand.

[0016] The pressing device of the present application has the following benefits: Auxiliary drainage structures are arranged inside each surface of the pressing device of the present application, so that the water in the tofu can be discharged outward from all directions during the pressing process, which can effectively improve the drainage efficiency and avoid uneven distribution of water inside the tofu; The movable drainage plate of the auxiliary drainage structure is a movable setting, which can effectively prevent the local suction force of the pressing box from being too large, so that the moisture in the tofu flows out under negative pressure, avoiding the force of the suction pump directly acting on the tofu to cause deformation or even damage, thereby ensuring the qualified rate of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axial schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the bottom axial side of the pressing plate of the present invention.

[0019] Figure 3 It is a right side schematic view of the pressing plate of the present invention.

[0020] Figure 4 For the present invention Figure 3 Schematic diagram of the AA section structure.

[0021] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of part A.

[0022] Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure of part B.

[0023] Among them, 1. box body, 2. pressure plate, 3. filter membrane, 4. first drain board, 5. movable drain board, 6. second drain board, 7. drainage chamber, 8. connecting pipe, 9. first drainage hole, 10. second drainage hole, 11. water suction channel, 12. drainage pipe, 13. negative pressure pipe, 14. connecting layer, 15. two-way air pump, 16. water channel, 17. driving cam, 18. push rod, 19. reset spring, 20. fixed bracket, 21. hydraulic cylinder. DETAILED DESCRIPTION

[0024] A pressing production process for dried bean curd comprises the following steps: S1. Preparation: Place the tofu blank into a pressing device and level the surface of the tofu blank for later use; S2. Preliminary pressing: The tofu blank is pressed by a pressing device, the pressing time is T1, the residence time is S1, and the number of pressing times is N1; S3. Secondary pressing: On the basis of the initial pressing, the tofu blank is pressed for the second time by the pressing equipment, the pressing time is T2, the residence time is S2, and the number of pressing times is N2; S4 three times of pressing: on the basis of the secondary pressing, the tofu blank is continued to be pressed by the pressing equipment, the pressing time is T3, the residence time is S3, the pressing number is N3, and the desired dry tofu is obtained; S5. Cutting and packaging: The dried tofu obtained in step S4 is taken out from the pressing device, and the dried tofu is cut and then packaged.

[0025] The pressing times T1, T2 and T3 are 1-10 minutes respectively, the residence times S1, S2 and S3 are 0.5-5 minutes respectively, and the pressing times N1, N2 and N3 are 1-5 times respectively.

[0026] In step S2, the pressure range during the initial pressing process is 0.2-0.5 MPa, in step S3, the pressure range during the secondary pressing process is 0.5-1.0 MPa, and in step S4, the pressure range during the tertiary pressing process is 1.0-1.5 MPa.

[0027] The embodiment adopts the above-mentioned pressing production process of dried tofu and the pressing equipment of the present application to produce dried tofu; Comparative Example 1 adopts the pressing production process of the present application and produces dried tofu through existing pressing equipment, and Comparative Example 2 adopts a one-time pressing method and existing pressing equipment to prepare dried tofu; Comparative Example 3 adopts a one-time pressing method and the pressing equipment of the present application to produce dried tofu.

[0028] The pressing process of the present application can obtain dried tofu with a low moisture content, and the pressing equipment of the present application can obtain a dried tofu product with a relatively uniform moisture content, and the taste of each position of the finished dried tofu product is uniform.

[0029] However, the dried tofu obtained by the one-time pressing method has a higher water content, and the pressing effect of the traditional pressing device is poorer than that of the pressing device of the present application.

[0030] like Figure 1-6 The pressing device shown comprises a pressing box and a hydraulic assembly, wherein the pressing box comprises a box body 1 and a pressing plate 2, the hydraulic assembly is vertically connected to the upper side of the pressing plate 2, and auxiliary drainage structures are provided on the wall of the box body 1 and inside the pressing plate 2, and when the hydraulic assembly presses the pressing plate 2 downward, the moisture in the tofu blank can be discharged from the top, sides and bottom; The inner wall of the pressing box is provided with a filter membrane 3, and the auxiliary drainage structure is provided on the inner side of the filter membrane 3. The auxiliary drainage structure includes a first drain plate 4, a movable drain plate 5 and a second drain plate 6 which are sequentially arranged from the inside to the outside. A drainage cavity 7 is provided on the outer side of the second drain plate 6. The drainage cavity 7 is connected to the moving space where the movable drain plate 5 is located by a connecting pipe 8. The first drain plate 4 and the second drain plate 6 are respectively provided with a first drainage hole 9 and a second drainage hole 10. The movable drain plate 5 is provided with a water drawing channel 11. When the movable drain plate 5 is in the water drawing state, the water drawing channel 11 is in a negative pressure state and is connected with the first drainage hole 9. When the movable drain plate 5 is in the drainage state, the water drawing channel 11 is connected with the second drainage hole 10, and the water in the water drawing channel 11 is discharged outward through the connecting pipe 8.

[0031] The water-drawing channel 11 has a larger diameter in the middle, so that a certain amount of water can be stored inside the water-drawing channel 11. The water-drawing channel 11 cannot be connected to the first drainage hole 9 and the second drainage hole 10 at the same time. The filter membrane 3 is flush with the inner wall of the pressing box, and the filter membrane 3 only allows water to pass through. The area of ​​the filter membrane 3 should not be less than 80% of the single inner area of ​​the pressing box.

[0032] like Figure 4 and Figure 5 As shown, the connecting pipe 8 is connected to the upper part of the drainage chamber 7, the bottom of the drainage chamber 7 is connected to a drainage pipe 12, and the drainage pipe 12 is equipped with a water pump; The upper portion of the drainage chamber 7 is connected to a negative pressure pipe 13 , and the negative pressure pipe 13 is provided with a suction pump for sucking water in the connecting pipe 8 .

[0033] The negative pressure pipe 13 and the suction pump are used to discharge the water in the connecting pipe 8. When the suction pump is in action, it can suck the water channel 11 through the connecting pipe 8 without causing the water in the drainage chamber 7 to flow out; the water in the drainage chamber 7 is discharged through the drainage pipe 12.

[0034] like Figure 4 and Figure 5As shown, a connecting layer 14 is provided on the outer side of the second drainage plate 6, and the connecting layer 14 is equipped with a two-way air pump 15. When one end of the water-drawing channel 11 is connected with the second drainage hole 10, the other end of the water-drawing channel 11 is in contact and sealed with the first drainage plate 4, and the two-way air pump 15 inhales air to make the inside of the water-drawing channel 11 in a negative pressure state.

[0035] When the two-way air pump 15 vents inward, the water in the water-drawing channel 11 can be discharged into the connecting pipe 8. When the two-way air pump 15 draws air outward, the negative pressure pipe 13 and the drainage pipe 12 are both closed, so that negative pressure is formed inside the water-drawing channel 11. Correspondingly, the negative pressure pipe 13 and the drainage pipe 12 should be equipped with solenoid valves.

[0036] like Figure 5 As shown, a water channel 16 is provided inside the movable drain plate 5, and the water channel 16 is connected with a plurality of water intake channels 11, and the water channel 16 is located adjacent to the water intake channel 11 and the first drain plate 4; One end of the water passage 16 is an opening, and the opening can be connected to the connecting pipe 8 .

[0037] The end of the water passage 16 opposite to the connecting pipe 8 is an opening. When the movable drain plate 5 is in the water-drawing state, the opening of the water passage 16 contacts the surface of the first drain plate 4 to form a seal.

[0038] like Figure 6 As shown, the movable area of ​​the movable drain plate 5 is larger than the area of ​​the first drain plate 4 and the area of ​​the second drain plate 6, the movable drain plate 5 is provided with a push rod 18, a driving cam 17 is provided inside the pressing box, the driving cam 17 is provided in contact with the push rod 18, and a return spring 19 is provided on the opposite side of the push rod 18 and the driving cam 17; The driving cam 17 is equipped with a driving motor. When the long diameter outer end of the driving cam 17 contacts the push rod 18, the movable drain plate 5 is pushed to be dislocated with the first drain plate 4, the open end of the water channel 16 is connected with the end of the connecting pipe 8, and the water inside the water drawing channel 11 is discharged outward. When the short diameter end of the driving cam 17 contacts the push rod 18, the reset spring 19 pushes the movable drain plate 5 to be dislocated with the second drain plate 6, and the water drawing channel 11 is connected with the first drainage hole 9 to draw water.

[0039] The arrangement of the push rod 18 does not affect the operation and sealing of other structures, and the driving motor is located outside the pressing box.

[0040] like Figure 1As shown, it also includes a fixed bracket 20, the box body 1 is arranged on the fixed bracket 20, the hydraulic component is fixedly connected to the upper part of the fixed bracket 20, and the hydraulic component includes a hydraulic cylinder 21, and the extended end of the hydraulic cylinder 21 is vertically connected to the pressure plate 2.

[0041] How to use the pressing equipment: When the device is used, firstly, the tofu blank is placed inside the box 1, and the pressing plate 2 is pressed downward by the hydraulic cylinder 21; When the pressing plate 2 is pressed down, the water in the tofu blank passes through the filter membrane 3 and enters the shell of the pressing box, and is discharged outward through the auxiliary drainage structure. The operating principle of the auxiliary drainage structure is as follows: First, the motor is driven to make the movable drain plate 5 in a draining state, the water-drawing channel 11 of the movable drain plate 5 is connected with the second drain hole 10, the water pump and the suction pump stop working, and the drain pipe 12 and the negative pressure pipe 13 are closed; The water-drawing channel 11 is pumped by the bidirectional air pump 15, so that the water-drawing channel 11 is in a negative pressure state; The driving motor continues to operate, so that the movable drain plate 5 moves away from the connecting pipe 8 until a water-drawing state is formed. At this time, the water-drawing channel 11 is relatively connected with the first drain hole 9. At this time, since the water-drawing channel 11 is in a negative pressure state, the water inside the pressing box slowly flows into the water-drawing channel 11 under the action of the negative pressure. The driving motor continues to run to restore the movable drain plate 5 to the drainage state, the water intake channel 11 is connected with the second drainage hole 10, and the water discharge channel 16 is connected with the connecting pipe 8. At this time, the water intake channel 11 is pressurized by the two-way air pump 15, and the suction pump is sucked at the same time, so that the water inside the movable drain plate 5 is discharged into the drainage chamber 7 through the connecting pipe 8, and the water inside the drainage chamber 7 can be discharged regularly.

[0042] In the above process, the suction force of the suction pump does not directly act on the tofu blank. Negative pressure water is drawn through the movable drainage plate 5, which can effectively avoid deformation of the tofu blank caused by excessive suction force. In addition, drainage is carried out in multiple directions at the same time, which can effectively improve the preparation efficiency of dried tofu.

[0043] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product forms and styles of the above-mentioned specific embodiments. Any pressing production process of dried tofu and its pressing equipment that conform to the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A pressing production process for dried bean curd, characterized in that: The steps include: S1. Preparation: Place the tofu blank into a pressing device and level the surface of the tofu blank for later use; S2. Preliminary pressing: The tofu blank is pressed by a pressing device, the pressing time is T1, the residence time is S1, and the number of pressing times is N1; S3. Secondary pressing: On the basis of the initial pressing, the tofu blank is pressed for the second time by the pressing equipment, the pressing time is T2, the residence time is S2, and the number of pressing times is N2; S4 three times of pressing: on the basis of the secondary pressing, the tofu blank is continued to be pressed by the pressing equipment, the pressing time is T3, the residence time is S3, the pressing number is N3, and the desired dry tofu is obtained; S5. Cutting and packaging: The dried tofu obtained in step S4 is taken out from the pressing device, and the dried tofu is cut and then packaged.

2. The pressing production process of dried bean curd according to claim 1, characterized in that: The pressing times T1, T2 and T3 are 1-10 minutes respectively, the residence times S1, S2 and S3 are 0.5-5 minutes respectively, and the pressing times N1, N2 and N3 are 1-5 times respectively.

3. The pressing production process of dried bean curd according to claim 1, characterized in that: In step S2, the pressure range during the initial pressing process is 0.2-0.5 MPa, in step S3, the pressure range during the secondary pressing process is 0.5-1.0 MPa, and in step S4, the pressure range during the tertiary pressing process is 1.0-1.5 MPa.

4. A dried bean curd pressing device, used in the dried bean curd pressing production process according to any one of claims 1 to 3, characterized in that: The press box comprises a press box and a hydraulic assembly, wherein the press box comprises a box body (1) and a press plate (2), the hydraulic assembly is vertically connected to the upper side of the press plate (2), the wall of the box body (1) and the interior of the press plate (2) are both provided with auxiliary drainage structures, and when the hydraulic assembly presses the press plate (2) downward, moisture in the tofu blank can be discharged outward from the top, sides and bottom; The inner wall of the pressing box is provided with a filter membrane (3), the auxiliary drainage structure is provided on the inner side of the filter membrane (3), the auxiliary drainage structure comprises a first drainage plate (4), a movable drainage plate (5) and a second drainage plate (6) which are arranged in sequence from the inside to the outside, a drainage cavity (7) is provided on the outer side of the second drainage plate (6), the drainage cavity (7) and the movable space where the movable drainage plate (5) is located are connected by a connecting pipe (8), the first drainage plate (4) and the second drainage plate (6) are respectively provided with a first drainage hole (9) and a second drainage hole (10), the movable drainage plate (5) is provided with a water drawing channel (11), when the movable drainage plate (5) is in a water drawing state, the water drawing channel (11) is in a negative pressure state and is connected with the first drainage hole (9), when the movable drainage plate (5) is in a drainage state, the water drawing channel (11) is connected with the second drainage hole (10), and the water in the water drawing channel (11) is discharged outward through the connecting pipe (8).

5. The dried bean curd pressing device according to claim 4, characterized in that: The connecting pipe (8) is connected to the upper part of the drainage chamber (7), the bottom of the drainage chamber (7) is connected to a drainage pipe (12), and the drainage pipe (12) is equipped with a water pump; The upper part of the drainage chamber (7) is connected to a negative pressure pipe (13), and the negative pressure pipe (13) is provided with a suction pump for sucking water in the connecting pipe (8).

6. The dried bean curd pressing device according to claim 4, characterized in that: A connecting layer (14) is arranged on the outer side of the second drainage plate (6), and the connecting layer (14) is provided with a two-way air pump (15). When one end of the water-drawing channel (11) is connected with the second drainage hole (10), the other end of the water-drawing channel (11) is in contact and sealed with the first drainage plate (4), and the two-way air pump (15) inhales air, so that the inside of the water-drawing channel (11) is in a negative pressure state.

7. The dried bean curd pressing device according to claim 4, characterized in that: The movable drain plate (5) is provided with a water channel (16) inside, the water channel (16) is connected with a plurality of water intake channels (11), and the water channel (16) is located adjacent to the water intake channels (11) and the first drain plate (4); One end of the water passage (16) is an opening, and the opening can be connected to the connecting pipe (8).

8. The dried bean curd pressing device according to claim 4, characterized in that: The movable area of ​​the movable drain plate (5) is larger than the area of ​​the first drain plate (4) and the area of ​​the second drain plate (6); the movable drain plate (5) is provided with a push rod (18); a driving cam (17) is provided inside the pressing box; the driving cam (17) is arranged in contact with the push rod (18); a return spring (19) is provided on the opposite side of the push rod (18) and the driving cam (17); The driving cam (17) is provided with a driving motor. When the long diameter outer end of the driving cam (17) contacts the push rod (18), the movable drain plate (5) is pushed to be displaced with the first drain plate (4), and the water inside the water-drawing channel (11) is discharged outward. When the short diameter of the driving cam (17) contacts the push rod (18), the return spring (19) pushes the movable drain plate (5) to be displaced with the second drain plate (6), and the water-drawing channel (11) is connected with the first drain hole (9) to draw water.

9. The dried bean curd pressing device according to claim 4, characterized in that: It also includes a fixed bracket (20), the box body (1) is arranged on the fixed bracket (20), the hydraulic component is fixedly connected to the upper part of the fixed bracket (20), and the hydraulic component includes a hydraulic cylinder (21), and the extended end of the hydraulic cylinder (21) is vertically connected to the pressure plate (2).

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