A pressing production process for dried bean curd and its pressing equipment

Abstract

The present invention relates to the technical field of dried bean curd production, specifically a pressing production process and pressing equipment for dried bean curd. The production process includes the following steps: S1. Prepare materials; S2. Preliminary pressing; S3. Secondary pressing; S4. Tertiary pressing; S5. Cut and package. The pressing equipment includes a pressing box and a hydraulic component. The pressing box includes a box body and a pressing plate. The hydraulic component is vertically connected to the upper side of the pressing plate. Auxiliary drainage structures are provided inside the walls of the box body and the pressing plate. When the hydraulic component presses the pressing plate downward, the moisture in the tofu blank can be discharged outward from the top, side, and bottom; through step-by-step pressing, the moisture content of the dried bean curd can be precisely controlled to meet different market demands; and during the pressing process, the moisture is evenly distributed, the product texture is consistent, and the taste is better; the process parameters are flexibly adjustable, and tofu products with different dryness 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 pressing production process of dried tofu and pressing equipment thereof, so as to solve 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 dryness and wetness inside the dried tofu are unevenly distributed. 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:

[0007] S1. Preparation: Place the tofu blank into a pressing device and level the surface of the tofu blank for later use;

[0008] 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;

[0009] 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;

[0010] 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;

[0011] 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.

[0012] 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.

[0013] As an optimization, in step S2, the pressure range during the preliminary 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. In step S4, the pressure range during the tertiary pressing process is 1.0 - 1.5 MPa.

[0014] A pressing device, comprising a pressing box and a hydraulic component. The pressing box includes a box body and a pressing plate. The hydraulic component is vertically connected to the upper side of the pressing plate. An auxiliary drainage structure is provided inside the wall of the box body and the pressing plate. When the hydraulic component presses the pressing plate down, the water in the tofu blank can be discharged outward from the top, side, and bottom.

[0015] A filter membrane is provided on the inner wall of the pressing box. The auxiliary drainage structure is arranged inside the filter membrane. The auxiliary drainage structure includes a first drainage plate, a movable drainage plate, and a second drainage plate which are sequentially attached from the inside out. A drainage cavity is provided outside the second drainage plate. A communication pipe connects the drainage cavity and the moving space where the movable drainage plate is located. The first drainage plate and the second drainage plate are respectively provided with a first drainage hole and a second drainage hole. The movable drainage plate is provided with a water absorption channel. When the movable drainage plate is in the water absorption state, the water absorption channel is in a negative pressure state and communicates with the first drainage hole. When the movable drainage plate is in the drainage state, the water absorption channel communicates with the second drainage hole, and the water in the water absorption channel is discharged outward through the communication pipe.

[0016] As an optimization, the communication pipe is connected to the upper part of the drainage cavity. A drain pipe is connected to the bottom of the drainage cavity, and the drain pipe is equipped with a water pump.

[0017] A negative pressure pipe is connected to the upper part of the drainage cavity. The negative pressure pipe is equipped with a suction pump for sucking the water in the communication pipe.

[0018] As an optimization, a communication layer is provided outside the second drainage plate. The communication layer is equipped with a two-way air pump. When one end of the water absorption channel communicates with the second drainage hole, the other end of the water absorption channel is in contact with and sealed by the first drainage plate, and the two-way air pump sucks air to make the inside of the water absorption channel in a negative pressure state.

[0019] As an optimization, a water flow channel is provided inside the movable drainage plate. The water flow channel communicates with a plurality of water absorption channels, and the water flow channel is located at the adjacent position of the water absorption channel and the first drainage plate.

[0020] One end of the water flow channel is an opening, and the opening can be communicated with the communication pipe.

[0021] As an optimization, the movable area of the movable drainage plate is larger than the areas of the first drainage plate and the second drainage plate. The movable drainage plate is configured with a push rod, and a driving cam is arranged inside the pressing box. The driving cam is in contact with the push rod, and a return spring is arranged on the opposite side of the push rod and the driving cam;

[0022] The driving cam is configured with a driving motor. When the outer end of the long diameter of the driving cam contacts the push rod, it pushes the movable drainage plate to be misaligned with the first drainage plate, and the water inside the water absorption channel is discharged outward. When the short diameter of the driving cam contacts the push rod, the return spring pushes the movable drainage plate to be misaligned with the second drainage plate, and the water absorption channel communicates with the first drainage hole to draw water.

[0023] As an optimization, it further includes a fixed bracket. The box body is arranged on the fixed bracket, and the hydraulic component is fixedly connected to the upper part of the fixed bracket. The hydraulic component includes a hydraulic cylinder, and the extending end of the hydraulic cylinder is vertically connected to the pressing plate.

[0024] The beneficial effects of a pressing production process for dried tofu in this solution are as follows:

[0025] Through step-by-step pressing, the water content of the dried tofu can be precisely controlled to meet different market demands; and during the pressing process, the water is evenly distributed, the product texture is consistent, and the taste is better; the process parameters are flexibly adjustable, and tofu products with different dryness can be obtained according to requirements.

[0026] The pressing device of this application has the following beneficial effects:

[0027] Auxiliary drainage structures are arranged inside each surface of the pressing device of this application. During the pressing process, the water in the tofu can be discharged outward from all directions, which can effectively improve the drainage efficiency and avoid uneven distribution of water inside the tofu;

[0028] The movable drainage plate of the auxiliary drainage structure is movably arranged, which can effectively prevent excessive local suction force on the pressing box, enable the water in the tofu to flow out under negative pressure, avoid the direct action of the suction pump force on the tofu resulting in deformation or even damage, and ensure the qualified rate of the finished product. Description of the Drawings

[0029] Figure 1 It is an axonometric schematic diagram of the present invention.

[0030] Figure 2 It is an axonometric schematic diagram of the bottom of the pressing plate of the present invention.

[0031] Figure 3 It is a right view schematic diagram of the pressing plate of the present invention.

[0032] Figure 4 For the present inventionFigure 3 Schematic cross-sectional structure diagram taken along line A-A

[0033] Figure 5 For the present invention Figure 4 Enlarged schematic structure diagram of part A

[0034] Figure 6 For the present invention Figure 4 Enlarged schematic structure diagram of part B

[0035] Wherein, 1, box body; 2, pressing plate; 3, filter membrane; 4, first drainage plate; 5, movable drainage plate; 6, second drainage plate; 7, drainage cavity; 8, connecting pipe; 9, first drainage hole; 10, second drainage hole; 11, water suction channel; 12, drain pipe; 13, negative pressure pipe; 14, connecting layer; 15, two-way air pump; 16, water flow channel; 17, driving cam; 18, push rod; 19, return spring; 20, fixed bracket; 21, hydraulic cylinder Detailed implementation mode

[0036] A pressing production process for dried bean curd, comprising the following steps

[0037] S1. Preparation of materials: Put the bean curd blank into the pressing equipment, and level the surface of the bean curd blank for standby

[0038] S2. Primary pressing: Press the bean curd blank through the pressing equipment, with the downward pressing time being T1, the staying time being S1, and the number of pressing times being N1

[0039] S3. Secondary pressing: On the basis of the primary pressing, press the bean curd blank through the pressing equipment again, with the downward pressing time being T2, the staying time being S2, and the number of pressing times being N2

[0040] S4. Tertiary pressing: On the basis of the secondary pressing, continue to press the bean curd blank through the pressing equipment, with the downward pressing time being T3, the staying time being S3, and the number of pressing times being N3, to obtain the required dried bean curd

[0041] S5. Cutting and packaging: Take out the dried bean curd obtained in step S4 from the pressing equipment, cut the dried bean curd and then package it

[0042] The downward pressing times T1, T2 and T3 are respectively 1 - 10 minutes, the staying times S1, S2, S3 are respectively 0.5 - 5 minutes, and the number of pressing times N1, N2, N3 are respectively 1 - 5 times

[0043] In step S2, the pressure range during the primary pressing is 0.2 - 0.5 MPa, in step S3, the pressure range during the secondary pressing is 0.5 - 1.0 MPa, and in step S4, the pressure range during the tertiary pressing is 1.0 - 1.5 MPa

[0044] Examples adopt the above-mentioned pressing production process of dried bean curd and the pressing equipment of the present application to produce and prepare dried bean curd; Comparative Example 1 adopts the pressing production process of the present application and produces and prepares dried bean curd through existing pressing equipment. Comparative Example 2 adopts a one-time pressing method and existing pressing equipment to prepare dried bean curd; Comparative Example 3 adopts a one-time pressing method and the pressing equipment of the present application to produce and prepare dried bean curd.

[0045] Through the pressing process of the present application, dried bean curd with a lower moisture content can be obtained. And through the pressing equipment of the present application, the moisture content of the obtained dried bean curd products is relatively uniform, and the taste of each position of the dried bean curd finished product is uniform.

[0046] However, the moisture content of the dried bean curd obtained by the one-time pressing method is relatively high. Compared with the pressing equipment of the present application, the pressing effect of the traditional pressing device is relatively poor.

[0047] Such as Figures 1-6 The shown pressing equipment includes a pressing box and a hydraulic component. The pressing box includes a box body 1 and a pressing plate 2. The hydraulic component is vertically connected to the upper side of the pressing plate 2. Auxiliary drainage structures are provided inside the wall of the box body 1 and the pressing plate 2. When the hydraulic component presses down the pressing plate 2, the moisture in the tofu blank can be discharged outward from the top, side, and bottom.

[0048] A filter membrane 3 is provided on the inner wall of the pressing box. The auxiliary drainage structure is arranged inside the filter membrane 3. The auxiliary drainage structure includes a first drainage plate 4, a movable drainage plate 5, and a second drainage plate 6 that are sequentially attached from the inside to the outside. A drainage cavity 7 is provided outside the second drainage plate 6. A connecting pipe 8 is connected between the drainage cavity 7 and the moving space where the movable drainage plate 5 is located. 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 suction channel 11. When the movable drainage plate 5 is in the water suction state, the water suction channel 11 is in a negative pressure state and communicates with the first drainage hole 9. When the movable drainage plate 5 is in the drainage state, the water suction channel 11 communicates with the second drainage hole 10, and the water in the water suction channel 11 is discharged outward through the connecting pipe 8.

[0049] The middle diameter of the water suction channel 11 is larger, so that a certain amount of water can be stored inside the water suction channel 11. The water suction channel 11 cannot communicate with 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 moisture 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.

[0050] Such as Figure 4 And Figure 5 As shown, the connecting pipe 8 is connected to the upper part of the drainage cavity 7. A drain pipe 12 is connected to the bottom of the drainage cavity 7. The drain pipe 12 is equipped with a water pump.

[0051] A negative pressure pipe 13 is connected to the upper part of the drainage cavity 7, and the negative pressure pipe 13 is configured with a suction pump for sucking the water in the connecting pipe 8.

[0052] The negative pressure pipe 13 and the suction pump are used to drain the water in the connecting pipe 8 outwards. When the suction pump works, it can suck the water through the connecting pipe 8 to the water suction channel 11 without causing the water inside the drainage cavity 7 to flow out; the water in the drainage cavity 7 is discharged through the drain pipe 12.

[0053] As Figure 4 and Figure 5 shown, a connecting layer 14 is arranged outside the second drainage plate 6, and the connecting layer 14 is configured with a two-way air pump 15. When one end of the water suction channel 11 communicates with the second drainage hole 10, the other end of the water suction channel 11 is in contact with and sealed to the first drainage plate 4, and the two-way air pump 15 sucks air to make the inside of the water suction channel 11 in a negative pressure state.

[0054] When the two-way air pump 15 intakes air, it can make the water in the water suction channel 11 drain into the connecting pipe 8. When the two-way air pump 15 pumps air outwards, both the negative pressure pipe 13 and the drain pipe 12 are in a closed state, making the inside of the water suction channel 11 form a negative pressure. Correspondingly, the negative pressure pipe 13 and the drain pipe 12 should be configured with solenoid valves.

[0055] As Figure 5 shown, a water passage 16 is arranged inside the movable drainage plate 5, and the water passage 16 communicates with a plurality of water suction channels 11. The water passage 16 is located at the adjacent position of the water suction channel 11 and the first drainage plate 4;

[0056] One end of the water passage 16 is an opening, and the opening can be arranged to communicate with the connecting pipe 8.

[0057] The end of the water passage 16 opposite to the connecting pipe 8 is an opening. When the movable drainage plate 5 is in the water suction state, the opening of the water passage 16 contacts the surface of the first drainage plate 4 to form a seal.

[0058] As Figure 6 shown, the movable area of the movable drainage plate 5 is larger than the areas of the first drainage plate 4 and the second drainage plate 6. The movable drainage plate 5 is configured with a push rod 18. A driving cam 17 is arranged inside the pressing box, and the driving cam 17 is in contact with the push rod 18. A return spring 19 is arranged on the opposite side of the push rod 18 and the driving cam 17;

[0059] The driving cam 17 is configured with a driving motor. When the outer end of the long diameter of the driving cam 17 contacts the push rod 18, it pushes the movable drain plate 5 to be misaligned with the first drain plate 4, and the open end of the water passage 16 is docked with the end of the connecting pipe 8, and the water inside the water suction 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 misaligned with the second drain plate 6, and the water suction channel 11 communicates with the first drain hole 9 to draw water.

[0060] The setting 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.

[0061] Such as Figure 1 As shown, it further 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. The hydraulic component includes a hydraulic cylinder 21, and the extending end of the hydraulic cylinder 21 is vertically connected to the pressing plate 2.

[0062] Usage method of the pressing equipment:

[0063] When the device is specifically used, first place the tofu blank inside the box body 1, and press the pressing plate 2 downward through the hydraulic cylinder 21;

[0064] When the pressing plate 2 is pressed downward, the water in the tofu blank penetrates through the filter membrane 3 into 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:

[0065] First, through the operation of the driving motor, the movable drain plate 5 is in a drainage state. The water suction channel 11 of the movable drain plate 5 communicates 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;

[0066] The two-way air pump 15 is used to suck the water suction channel 11 to make the water suction channel 11 in a negative pressure state;

[0067] The driving motor continues to operate, making the movable drain plate 5 move away from the connecting pipe 8 until a water suction state is formed. At this time, the water suction channel 11 communicates with the first drain hole 9 relatively. At this time, due to the water suction channel 11 being in a negative pressure state, the water inside the pressing box slowly flows into the water suction channel 11 under the action of the negative pressure;

[0068] The driving motor continues to operate, making the movable drain plate 5 return to the drainage state. The water suction channel 11 communicates with the second drain hole 10, and the water passage 16 communicates with the connecting pipe 8. At this time, the two-way air pump 15 is used to pressurize the inside of the water suction channel 11, and at the same time the suction pump sucks, so that the water inside the movable drain plate 5 is discharged into the drainage cavity 7 through the connecting pipe 8, and the water inside the drainage cavity 7 is discharged regularly.

[0069] In the above process, the suction force of the suction pump does not directly act on the tofu blank. Negative pressure water extraction is carried out through the movable drainage plate 5, which can effectively avoid the deformation of the tofu blank caused by excessive suction force. And by draining water simultaneously in multiple directions, the preparation efficiency of dried tofu can be effectively improved.

[0070] The above 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 specific embodiments. Any pressing production process of dried tofu and its pressing equipment that conforms to the claims of the present invention and any appropriate changes or modifications made by those of ordinary skill in the relevant technical fields shall fall within the patent protection scope of the present invention.

Claims

1. A pressing device for dried bean curd, characterized in that: It includes a pressing box and a hydraulic component. The pressing box includes a box body (1) and a pressing plate (2). The hydraulic component is vertically connected to the upper side of the pressing plate (2). An auxiliary drainage structure is provided inside the wall of the box body (1) and inside the pressing plate (2). When the hydraulic component presses down the pressing plate (2), the water in the tofu blank can be discharged outward from the top, side, and bottom. A filter membrane (3) is provided on the inner wall of the pressing box. The auxiliary drainage structure is arranged inside the filter membrane (3). The auxiliary drainage structure includes a first drainage plate (4), a movable drainage plate (5), and a second drainage plate (6) which are sequentially attached to each other from the inside to the outside. A drainage cavity (7) is provided on the outer side of the second drainage plate (6). A connecting pipe (8) is connected between the drainage cavity (7) and the moving space where the movable drainage plate (5) is located. 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 absorption channel (11). When the movable drainage plate (5) is in the water absorption state, the water absorption channel (11) is in a negative pressure state and communicates with the first drainage hole (9). When the movable drainage plate (5) is in the drainage state, the water absorption channel (11) communicates with the second drainage hole (10). The water in the water absorption channel (11) is discharged outward through the connecting pipe (8).

2. The pressing device for dried bean curd according to claim 1, wherein: The connecting pipe (8) is connected to the upper part of the drainage cavity (7). A drain pipe (12) is connected to the bottom of the drainage cavity (7). The drain pipe (12) is equipped with a water pump. A negative pressure pipe (13) is connected to the upper part of the drainage cavity (7). The negative pressure pipe (13) is equipped with a suction pump for sucking the water in the connecting pipe (8).

3. The pressing device for dried bean curd according to claim 1, characterized in that: A connecting layer (14) is provided on the outer side of the second drainage plate (6). The connecting layer (14) is equipped with a two-way air pump (15). When one end of the water absorption channel (11) communicates with the second drainage hole (10), the other end of the water absorption channel (11) is in contact and sealed with the first drainage plate (4), and the two-way air pump (15) sucks air to make the inside of the water absorption channel (11) in a negative pressure state.

4. A pressing device for dried bean curd according to claim 1, characterized in that: A water flow channel (16) is provided inside the movable drainage plate (5). The water flow channel (16) communicates with a plurality of water absorption channels (11). The water flow channel (16) is located at the adjacent position of the water absorption channel (11) and the first drainage plate (4). One end of the water flow channel (16) is an opening, and the opening can be communicated with the connecting pipe (8).

5. The pressing device for dried bean curd according to claim 1, wherein: The movable area of the movable drainage plate (5) is larger than the areas of the first drainage plate (4) and the second drainage plate (6). The movable drainage plate (5) is equipped with a push rod (18). A driving cam (17) is arranged inside the pressing box. The driving cam (17) is in contact with the push rod (18). A return spring (19) is arranged on the opposite side of the push rod (18) and the driving cam (17). The driving cam (17) is configured with a driving motor. When the outer end of the long diameter of the driving cam (17) contacts the push rod (18), it pushes the movable drainage plate (5) to be misaligned with the first drainage plate (4), and the water inside the water absorption 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 drainage plate (5) to be misaligned with the second drainage plate (6), and the water absorption channel (11) communicates with the first drainage hole (9) to absorb water.

6. The pressing device for dried bean curd according to claim 1, wherein: It further 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). The hydraulic component includes a hydraulic cylinder (21), and the extending end of the hydraulic cylinder (21) is vertically connected to the pressing plate (2).

7. A pressing production process for dried bean curd, comprising the pressing equipment for dried bean curd according to any one of claims 1-6, characterized in that: It includes the following steps: S1. Stock preparation: Put the tofu blank into the pressing equipment, and level the surface of the tofu blank for standby. S2. Primary pressing: Press the tofu blank through the pressing equipment. The downward 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 primary pressing, press the tofu blank through the pressing equipment again. The downward pressing time is T2, the residence time is S2, and the number of pressing times is N2. S4. Tertiary pressing: On the basis of the secondary pressing, continue to press the tofu blank through the pressing equipment. The downward pressing time is T3, the residence time is S3, and the number of pressing times is N3 to obtain the required dried tofu. S5. Cutting and packaging: Take out the dried tofu obtained in step S4 from the pressing equipment, cut the dried tofu and then package it.

8. A pressing production process for dried tofu according to claim 7, characterized in that: The downward pressing times T1, T2 and T3 are 1 - 10 minutes respectively, the residence times S1, S2, S3 are 0.5 - 5 minutes respectively, and the number of pressing times N1, N2, N3 are 1 - 5 times respectively.

9. A pressing production process for dried tofu according to claim 7, characterized in that: In step S2, the pressure range during the primary 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. In step S4, the pressure range during the tertiary pressing process is 1.0 - 1.5 MPa.

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