Extrusion nozzle device and method of temperature-controlled food 3D printer

Abstract

The application discloses a temperature control type food 3D printer extrusion nozzle device, which comprises vertical coaxial heat conduction outer cylinders, transmission cylinders and piston cylinders from outside to inside in sequence, the transmission cylinder can rotate coaxially relative to the heat conduction outer cylinder under the drive of a driving device, and helical transmission blades are integrally arranged on the outer wall of the transmission cylinder, so that annular helical transmission channels are formed between the transmission cylinder and the heat conduction outer cylinder; the piston cylinder is internally provided with a central transmission channel, the extrusion piston is movably arranged in the central transmission channel, the outer ring of the extrusion piston is provided with a piston sealing ring, and the piston sealing ring is movably and sealingly matched with the inner wall of the central transmission channel; the printing head can have multiple printing modes, especially, the nozzle can realize layered printing of two materials in one printing track in the printing process, so that the taste of the printed food is improved, the appearance of the printed food is beautified, the printing time is shortened and the printing effect is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of food printing. BACKGROUND

[0002] Food 3D printing technology is developed on the basis of 3D printing technology, and its main working mode is to extrude edible slurry through air pressure or screw, and print according to the set program under the control of the machine software, and the printed object can be immediately eaten or further processed. Food 3D printing is different from other industrial 3D printing, and has no high precision requirement, but has requirements such as fluffy feeling, extrusion of composite food materials and various requirements; the nozzle of the 3D food printer on the market can generally only extrude the same material, and if two kinds of composite food materials need to be printed on the same printing layer, the printing head needs to be frequently replaced, so as to achieve the purpose of extruding composite food materials by one nozzle, and the temperature of the extruded food materials cannot be controlled. SUMMARY

[0003] The present application provides an extrusion nozzle device and method of a temperature-controlled food 3D printer with multiple printing modes.

[0004] Technical scheme: In order to achieve the above-mentioned purpose, the extrusion nozzle device of the temperature-controlled food 3D printer of the present application comprises a vertical from outside to inside coaxial heat conduction outer cylinder, transmission cylinder and piston cylinder, the transmission cylinder can rotate coaxially relative to the heat conduction outer cylinder under the driving of the driving device, the transmission cylinder outer wall is integrally spirally provided with a spiral transmission blade, so as to form an annular spiral transmission channel between the transmission cylinder and the heat conduction outer cylinder; the piston cylinder is provided with a central transmission channel, and the central transmission channel is movably provided with an extrusion piston, and the extrusion piston is provided with a piston sealing ring, and the piston sealing ring is movably sealed with the inner wall of the central transmission channel.

[0005] The lower ends of the heat conduction outer cylinder and the piston cylinder are jointly connected with a material extrusion unit, the material extrusion unit comprises a central extrusion channel and a plurality of peripheral extrusion channels arranged in a circumferential array around the central extrusion channel; the upper end of the central extrusion channel is connected with the lower end of the central transmission channel; the upper end of each peripheral extrusion channel is connected with the lower end of the annular spiral transmission channel.

[0006] Further, the outer wall of the heat conduction outer cylinder is provided with a temperature control device.

[0007] Further, the lower end of the central extrusion channel is connected with a tapered reduced diameter channel with a pointed end downward, and the lower end of the tapered reduced diameter channel is an extrusion outlet connected with the atmosphere, and the lower ends of the plurality of peripheral extrusion channels are connected around the extrusion outlet at the lower end of the tapered reduced diameter channel.

[0008] Further, the material extrusion unit is composed of a sleeve connecting cylinder and an extrusion head which are integrally connected coaxially; the inner wall of the lower end of the heat-conducting outer cylinder is fixedly connected with the outer wall of the upper end of the sleeve connecting cylinder; the outer ring of the lower end of the piston cylinder is sealingly connected with the inner ring of the upper end of the sleeve connecting cylinder.

[0009] Further, the transmission cylinder is integrally connected coaxially with a transmission sleeve at the upper end; the outer ring of the upper part of the transmission sleeve is fixedly connected coaxially with a transmission gear; the output end of the a motor is drivingly connected with an output gear 2, which is engaged with the transmission gear.

[0010] Further, the a food guide pipe is fixedly arranged on one side of the upper part of the heat-conducting outer cylinder and is communicated with the upper part of the annular spiral transmission channel; the b food guide pipe is fixedly connected on one side of the upper part of the piston cylinder and the outlet of the b food guide pipe is communicated with one side of the upper part of the central transmission channel.

[0011] Further, the extrusion piston is fixedly connected with a vertical piston push-pull rod at the upper end, and the electric lifter can drive the piston push-pull rod to move up and down.

[0012] Optionally, the inside of the integrated structure formed by the piston push-pull rod and the extrusion piston is provided with a telescopic rod downward telescopic device along the length direction, the extrusion piston is coaxially provided with a tapered embedding groove at the lower end, the tapered embedding groove is coaxially movably embedded with a hole plugging head with an elastic silica gel head 29 at the lower end, the hole plugging head is fixedly connected with the lower end of the telescopic rod at the upper end, and the telescopic rod is extended downward, so that the hole plugging head can be lowered in the central transmission channel until the elastic silica gel head 29 at the lower end of the hole plugging head is coaxially sealed and plugged with the lower part of the tapered reduced diameter channel.

[0013] Further, the working method of the extrusion nozzle device of the temperature-controlled food 3D printer includes the following three modes:

[0014] Single material ordinary printing extrusion mode:

[0015] The extrusion piston is controlled to be stationary, and the a motor is controlled to drive the transmission cylinder to rotate;

[0016] Single material food fluffy blowing printing extrusion mode:

[0017] In the initial state, the central transmission channel below the piston is an air section; the a motor is controlled to drive the transmission cylinder to rotate, and the extrusion piston is slowly displaced downward at the same time.

[0018] Double material printing:

[0019] In the initial state, the central transmission channel below the piston is filled with b liquid material; control a motor, and then drive the transmission cylinder to rotate, and slowly control the downward displacement of the extrusion piston while performing the rotation process; when the extrusion piston has been displaced downward to the lower end position of the central transmission channel, first pause a motor, and immediately control the extender to make the downward extension of the extension rod, and the plug head is lowered until the lower end of the plug head is coaxially sealed and blocks the lower part of the tapered reduced diameter channel; at this time, through the control of the lifter, the extrusion piston gradually rises, and at the same time, the extension rod continues to extend downward relative to the extrusion piston, so that the lower end of the plug head is always coaxially sealed and blocks the lower part of the tapered reduced diameter channel during the process of the gradual upward movement of the extrusion piston; during the upward movement of the extrusion piston, the volume of the central transmission channel below the extrusion piston gradually increases and is in a negative pressure evacuation state; when the extrusion piston rises above the outlet of the b food guide pipe, the b liquid food in the b food guide pipe is rapidly sucked into the central transmission channel below the extrusion piston under vacuum negative pressure, so that the central transmission channel is rapidly filled with b liquid food; then control the extension rod to retract upward, the plug head rises and is separated from the lower part of the blocked tapered reduced diameter channel, so that the lower part of the blocked tapered reduced diameter channel is re-opened, and the plug head rises to re-actively embed into the tapered slot, at this time, it returns to the "initial state".

[0020] Beneficial effects: The temperature control device exchanges heat with the paste-like a food material in the annular spiral transmission channel through the heat-conducting outer cylinder, thereby achieving the purpose of temperature control during the transmission of the paste-like a food material.

[0021] At the same time, the printing head of the present application can have multiple printing modes, especially the nozzle can realize the layered printing of two materials in one printing track during printing, which can improve the taste of printed food, beautify the appearance of printed food, reduce the printing time, and improve the printing effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the food printing head;

[0023] Figure 2 It is a schematic diagram of the food transmission part of the printing head;

[0024] Figure 3 It is the A-direction sectional view of "A"; Figure 2

[0025] Figure 4 It is a schematic diagram of the material extrusion unit structure;

[0026] Figure 5 It is a schematic diagram of two embodiments of the extrusion piston;

[0027] Figure 6 ​Fig. 4 is a schematic view of the telescopic rod of the second embodiment of the extrusion piston extended downward. DETAILED DESCRIPTION

[0028] The application will be further described below with reference to the accompanying drawings.

[0029] As shown in the accompanying drawings Figures 1 to 6 The temperature control type food 3D printer extrusion nozzle device comprises a vertical coaxial heat conduction outer cylinder 7, a transmission cylinder 4 and a piston cylinder 15 from outside to inside in sequence; the transmission cylinder 4 can rotate coaxially relative to the heat conduction outer cylinder 7 under the driving of a driving device, and the outer wall of the transmission cylinder 4 is integrally provided with spiral transmission blades 5 in a spiral manner, so that an annular spiral transmission channel 16 is formed between the transmission cylinder 4 and the heat conduction outer cylinder 7; the outer wall of the heat conduction outer cylinder 7 is provided with a temperature control device 25 in heat transfer cooperation, which can be a cooling device or a heating device according to the situation; the temperature control device 25 and the paste-like a food material in the annular spiral transmission channel 16 realize heat exchange through the thin-walled heat conduction outer cylinder 7, thereby achieving the purpose of temperature control during the transmission of the paste-like a food material.

[0030] As shown in the accompanying drawings Figure 3 The piston cylinder 15 is provided with a central transmission channel 8, and the extrusion piston 6 is movably arranged in the central transmission channel 8; the outer circle of the extrusion piston 6 is provided with a piston sealing ring 6, which is movably and sealingly matched with the inner wall of the central transmission channel 8.

[0031] The lower ends of the heat conduction outer cylinder 7 and the piston cylinder 15 are fixedly connected with a material extrusion unit 22, which comprises a central extrusion channel 14 and a plurality of peripheral extrusion channels 11 arranged in a circumferential array around the central extrusion channel 14; the upper end of the central extrusion channel 14 is communicated with the lower end of the central transmission channel 8; the upper end of each peripheral extrusion channel 11 is communicated with the lower end of the annular spiral transmission channel 16; the lower end of the central extrusion channel 14 is communicated with a tapered reduced diameter channel 13 with a pointed end downward, and the lower end of the tapered reduced diameter channel 13 is an extrusion outlet 12 communicated with the atmosphere; the lower ends of the plurality of peripheral extrusion channels 11 are communicated around the extrusion outlet 12 at the lower end of the tapered reduced diameter channel 13.

[0032] The material extrusion unit 22 is composed of a sleeve joint cylinder 9 and an extrusion head 10 which are integrally connected coaxially; the inner wall of the lower end of the heat conduction outer cylinder 7 is fixedly sleeved with the outer wall of the upper end of the sleeve joint cylinder 9; the outer circle of the lower end of the piston cylinder 15 is sealingly sleeved with the inner circle of the upper end of the sleeve joint cylinder 9; the end face of the upper end of the sleeve joint cylinder 9 is provided with an annular sealing groove 60, the groove bottom of the annular sealing groove 60 is provided with a sealing gasket 61, the lower end of the transmission cylinder 4 is movably inserted into the annular sealing groove 60 coaxially, and the lower end of the transmission cylinder 4 is movably and contactingly matched with the sealing gasket 61.

[0033] The upper end of the heat-conducting outer cylinder 7 is coaxially and integrally connected with an a-shell 2, the upper end of the a-shell 2 is fixed on a motor support 20, the upper part of the piston cylinder 15 is integrally and fixedly connected with the motor support 20, the upper end of the transmission cylinder 4 is coaxially and integrally connected with a transmission sleeve 3, the lower end surface of the transmission sleeve 3 seals the upper end of the annular spiral transmission channel 16, the lower part of the transmission sleeve 3 is rotatably connected with the a-shell 2 through a bearing 18, the upper part of the transmission sleeve 3 is coaxially fixed with a transmission gear 19, the motor support 20 is fixedly installed with an a-motor 24, the output end of the a-motor 24 is drivingly connected with an output gear 230, and the output gear 230 is engaged with the transmission gear 19.

[0034] As shown in Figure 2 , the upper part of the heat-conducting outer cylinder 7 is fixedly provided with an a-food introduction pipe 23 on one side, the a-food introduction pipe 23 is communicated with the upper part of the annular spiral transmission channel 16, the upper part of the piston cylinder 15 is fixedly connected with a b-food introduction pipe 21 on one side, and the outlet 1 of the b-food introduction pipe 21 is communicated with the upper part of the central transmission channel 8 on one side.

[0035] The upper end of the extrusion piston 6 is fixedly connected with a vertical piston push-pull rod 17, the electric lift can drive the piston push-pull rod 17 to move up and down, the upper side of the motor support 20 is fixedly installed with a lift cover 27, one side of the lift cover 27 is fixedly installed on a base 26, the lift is installed in the lift cover 27, and the lift of the case is a screw rod transmission lift.

[0036] First embodiment: the inside of the extrusion piston 6 is a solid structure, as shown in Figure 3 In this case, the process of filling the central transmission channel 8 with b-liquid material has the problems of low filling efficiency, insufficient filling amount, excessive filling amount, and the like, and the filling process is prone to cavities and bubbles, which affects the printing rhythm and printing quality, so the first embodiment is optimized to obtain the following second embodiment:

[0037] Second embodiment: as shown in Figure 5 and 6 , the inside of the integrated structure formed by the piston push-pull rod 17 and the extrusion piston 6 is provided with a telescopic rod 31 downward telescopic device 32 along the length direction, the lower end of the extrusion piston 6 is coaxially provided with a tapered embedding groove 30, the tapered embedding groove 30 is coaxially and movably embedded with a hole plugging head 29 with an elastic silica gel head 29.1 at the lower end, the hole plugging head 29 is a two-piece structure, and the maximum outer diameter is obviously smaller than the inner diameter of the central transmission channel 8, so as to facilitate the up-and-down shuttle in the food in the central transmission channel 8, the lower end of the hole plugging head 29 is fixedly connected with the lower end of the telescopic rod 31, the telescopic rod 31 extends downward, so that the hole plugging head 29 can descend in the central transmission channel 8, until the lower end of the elastic silica gel head 29.1 of the hole plugging head 29 coaxially seals and blocks the lower part of the tapered reduced diameter channel 13.

[0038] The working method of the extrusion nozzle device of the temperature-controlled food 3D printer includes the following three modes:

[0039] Single-material ordinary printing extrusion mode:

[0040] The extrusion piston 6 is controlled to be stationary, and the paste-like a food material is continuously conveyed to the annular spiral transmission channel 16 through the a food guide pipe 23 via the conveying pipe. Then, the a motor 24 is controlled to drive the transmission cylinder 4 to rotate, so that the paste-like a food material entering the annular spiral transmission channel 16 flows downward under the agitation of the spiral transmission blade 5, and then the paste-like a food material is branched downward into a plurality of peripheral extrusion channels 11, and finally converges at the extrusion outlet 12 and continuously extrudes outward, thereby realizing continuous extrusion of single ordinary a material.

[0041] Single-material food fluffy blowing printing extrusion mode:

[0042] In the initial state, the extrusion piston 6 is at the upper end position of the central transmission channel 8, and there is a section of air in the central transmission channel 8 below the piston 6. At this time, the paste-like a food material is continuously conveyed to the annular spiral transmission channel 16 through the a food guide pipe 23 via the conveying pipe. Then, the a motor 24 is controlled to drive the transmission cylinder 4 to rotate, so that the paste-like a food material entering the annular spiral transmission channel 16 flows downward under the agitation of the spiral transmission blade 5, and then the paste-like a food material is branched downward into a plurality of peripheral extrusion channels 11, and finally converges at the extrusion outlet 12 and continuously extrudes outward. While performing the rotation process, the extrusion piston 6 is also slowly controlled to move downward, so that the extrusion piston 6 slowly extrudes the section of air in the central transmission channel 8 downward, and under the action of pressure, the air in the central transmission channel 8 is slowly extruded downward to the center of the extrusion outlet 12 through the lower end of the tapered reduced diameter channel 13. Since the paste-like a material from the plurality of peripherally distributed peripheral extrusion channels 11 continuously converges at the extrusion outlet 12, the air extruded downward to the center of the extrusion outlet 12 through the lower end of the tapered reduced diameter channel 13 is continuously blown into the paste-like a material converging from all around to the extrusion outlet 12, thereby achieving a fluffy effect, so that the a material extruded downward at the extrusion outlet 12 is fluffy.

[0043] Double-material printing:

[0044] In the initial state, the extrusion piston 6 is in the upper end position of the central transmission channel 8, and the b flow material filled in the central transmission channel 8 below the piston 6 is a food material with high flowability, such as butter or the like; at this time, the paste-like a food material is continuously fed into the annular spiral transmission channel 16 through the a food feeding pipe 23, and then the a motor 24 is controlled to drive the transmission cylinder 4 to rotate, so that the paste-like a food material in the annular spiral transmission channel 16 flows downward under the stirring of the spiral transmission blade 5, and then the paste-like a food material is branched downward into several peripheral extrusion channels 11, and finally flows together at the extrusion outlet 12; while the rotation process is being performed, the extrusion piston 6 is also slowly controlled to move downward, so that the b flow material in the central transmission channel 8 is slowly extruded downward by the extrusion piston 6, and then under the action of pressure, the b flow material in the central transmission channel 8 is slowly extruded downward through the lower end of the tapered reduced diameter channel 13 to the center of the extrusion outlet 12; since the paste-like a material from the several peripherally distributed peripheral extrusion channels 11 continuously flows into the extrusion outlet 12, the b flow material extruded downward through the lower end of the tapered reduced diameter channel 13 to the center of the extrusion outlet 12 is continuously wrapped by the paste-like a material flowing into the extrusion outlet 12 from all around, so that the final extrusion at the extrusion outlet 12 is the composite material of the a material wrapped b flow material;

[0045] When the extrusion piston 6 has been displaced downward to the lower end position of the central transmission channel 8, the motor 24 is first paused, thereby pausing the supply process of the paste-like a material; on the basis of embodiment two, the telescopic rod 31 is then immediately controlled to extend downward, and the plug head 29 is lowered until the lower end of the plug head 29 is coaxially sealed with the lower part of the tapered reduced-diameter channel 13 by the elastic silica gel head 29.1; at this time, the extrusion piston 6 is gradually raised by the lifter control, and at the same time, the telescopic rod 31 is controlled to continue extending downward relative to the extrusion piston 6, so that the elastic silica gel head 29.1 at the lower end of the plug head 29 is always coaxially sealed with the lower part of the tapered reduced-diameter channel 13 during the gradual upward movement of the extrusion piston 6; since a continuous closed space is formed below the extrusion piston 6, the volume of the central transmission channel 8 below the extrusion piston 6 gradually increases and is in a negative pressure state during the upward movement of the extrusion piston 6; when the extrusion piston 6 rises above the guide outlet 1 of the b food guide pipe 21, the b liquid food in the b food guide pipe 21 is rapidly sucked into the central transmission channel 8 below the extrusion piston 6 under vacuum negative pressure, so that the central transmission channel 8 is rapidly filled with b liquid food; then the telescopic rod 31 is controlled to retract upward, the plug head 29 is raised and separated from the lower part of the blocked tapered reduced-diameter channel 13, so that the lower part of the blocked tapered reduced-diameter channel 13 is re-opened, and the plug head 29 is raised to re-engage in the tapered slot 30; at this time, the initial state is restored, and further double-material extrusion and printing can be quickly performed; this vacuum suction type improves the filling efficiency of the central transmission channel 8 with b liquid material, avoids the problems of insufficient filling and excessive filling, and also avoids the problems of cavities and bubbles during the filling process, effectively improving the printing rhythm and printing quality.

[0046] In the above three cases, the temperature control device 25 exchanges heat with the paste-like a food material in the annular spiral transmission channel 16 through the heat-conducting outer cylinder 7, thereby achieving the purpose of temperature control during the transmission of the paste-like a food material.

[0047] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. An extrusion nozzle device of a temperature-controlled food 3D printer, characterized by: The device comprises vertical coaxial heat-conducting outer cylinder (7), transmission cylinder (4) and piston cylinder (15) from outside to inside in turn, the transmission cylinder (4) can rotate coaxially relative to the heat-conducting outer cylinder (7) under the drive of the driving device, the spiral transmission blade (5) is integrally arranged on the outer wall of the transmission cylinder (4), so that the annular spiral transmission channel (16) is formed between the transmission cylinder (4) and the heat-conducting outer cylinder (7); the piston cylinder (15) is internally provided with the central transmission channel (8), and the extrusion piston (6) is movably arranged in the central transmission channel (8); The lower ends of the heat-conducting outer cylinder (7) and the piston cylinder (15) are jointly connected with the material extrusion unit (22), the material extrusion unit (22) internally comprises the central extrusion channel (14) and a plurality of peripheral extrusion channels (11) which are circumferentially arranged around the central extrusion channel (14); the upper end of the central extrusion channel (14) is communicated with the lower end of the central transmission channel (8); the upper end of each peripheral extrusion channel (11) is communicated with the lower end of the annular spiral transmission channel (16); The lower end of the central extrusion channel (14) is communicated with the tapered reduced diameter channel (13) with a pointed end downward, the lower end of the tapered reduced diameter channel (13) is the extrusion outlet (12) communicated with the atmosphere, and the lower ends of the plurality of peripheral extrusion channels (11) are communicated around the extrusion outlet (12) at the lower end of the tapered reduced diameter channel (13); The material extrusion unit (22) is composed of the sleeve joint cylinder (9) and the extrusion head (10) which are integrally coaxially connected; the inner wall of the lower end of the heat-conducting outer cylinder (7) is fixedly sleeved with the outer wall of the upper end of the sleeve joint cylinder (9); the outer circle of the lower end of the piston cylinder (15) is sealingly sleeved with the inner circle of the upper end of the sleeve joint cylinder (9); The upper end of the transmission cylinder (4) is integrally connected with the transmission sleeve (3) coaxially; the outer circle of the upper part of the transmission sleeve (3) is fixedly provided with the transmission gear (19) coaxially; the output end of the motor (24) is drivingly connected with the output gear (230), and the output gear (230) is engaged with the transmission gear (19); The upper end of the extrusion piston (6) is fixedly connected with the vertical piston push-pull rod (17), and the electric lifter can drive the piston push-pull rod (17) to move up and down; The inside of the integrated structure formed by the piston push-pull rod (17) and the extrusion piston (6) is provided with the downward telescopic rod (31) along the length direction; the lower end of the extrusion piston (6) is coaxially provided with the tapered embedding groove (30), the tapered embedding groove (30) is coaxially movably embedded with the hole-plugging head (29) with the elastic silica gel head (29.1) at the lower end, the lower end of the telescopic rod (31) is fixedly connected with the upper end of the hole-plugging head (29), the telescopic rod (31) extends downward, so that the hole-plugging head (29) can descend in the central transmission channel (8) until the elastic silica gel head (29.1) at the lower end of the hole-plugging head (29) coaxially seals and blocks the lower part of the tapered reduced diameter channel (13). 2.The temperature-controlled food 3D printer extrusion nozzle device according to claim 1, characterized in that: The a food guide pipe (23) is fixed on one side of the upper part of the heat conducting outer cylinder (7) and is communicated with the upper part of the annular spiral transmission channel (16); the b food guide pipe (21) is fixedly connected to one side of the upper part of the piston cylinder (15), and the guide outlet (1) of the b food guide pipe (21) is communicated with one side of the upper part of the central transmission channel (8). 3.The temperature-controlled food 3D printer extrusion nozzle device of claim 2, wherein: The outer wall of the heat conducting outer cylinder (7) is heat-conducting matched with the temperature control device (25). 4.The working method of the temperature-controlled food 3D printer extrusion nozzle device according to claim 3, characterized in that: There are three modes as follows: Normal printing extrusion mode of single material: The extrusion piston (6) is controlled to be stationary, and the a motor (24) is controlled to drive the transmission cylinder (4) to rotate; Loft blowing printing extrusion mode of single material food: In the initial state, the central transmission channel (8) below the piston (6) is filled with air; the a motor (24) is controlled to drive the transmission cylinder (4) to rotate, and the extrusion piston (6) is slowly controlled to be displaced downward during the rotation process; Double-material printing: In the initial state, the central transmission channel (8) below the piston (6) is filled with b liquid material; the a motor (24) is controlled to drive the transmission cylinder (4) to rotate, and the extrusion piston (6) is slowly controlled to be displaced downward during the rotation process; when the extrusion piston (6) has been displaced downward to the lower end position of the central transmission channel (8), the a motor (24) is first paused, and the extender (32) is immediately controlled to make the telescopic rod (31) extend downward, so that the hole blocking head (29) descends until the lower end of the elastic silica gel head (29.1) of the hole blocking head (29) coaxially seals and blocks the lower part of the tapered reduced diameter channel (13); at this time, the extrusion piston (6) is gradually raised through the lifter control, and the telescopic rod (31) is controlled to continue to extend downward relative to the extrusion piston (6), so that the elastic silica gel head (29.1) at the lower end of the hole blocking head (29) is always coaxially sealed and blocked to the lower part of the tapered reduced diameter channel (13) during the process that the extrusion piston (6) is gradually raised; during the upward movement of the extrusion piston (6), the volume of the central transmission channel (8) below the extrusion piston (6) gradually increases and is in a negative pressure evacuation state; when the extrusion piston (6) rises above the guide outlet (1) of the b food guide pipe (21), the b liquid food in the b food guide pipe (21) is rapidly sucked into the central transmission channel (8) below the extrusion piston (6) under the vacuum negative pressure, so that the central transmission channel (8) is rapidly filled with the b liquid food; then the telescopic rod (31) is controlled to retract upward, the hole blocking head (29) rises and is separated from the lower part of the blocked tapered reduced diameter channel (13), so that the lower part of the blocked tapered reduced diameter channel (13) is re-opened, and the hole blocking head (29) rises to be re-embedded in the tapered embedding groove (30), at this time, it returns to the "initial state".

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