Cleaning structure for milk pipeline of coffee machine

Abstract

The invention discloses a coffee machine milk pipe cleaning structure which comprises a mounting frame, a milk inlet part and a milk outlet part communicated with the milk inlet part are arranged on the mounting frame, a milk inlet unit and a milk outlet unit are arranged on the milk inlet part and the milk outlet part respectively, and a water inlet part used for feeding cleaning water flow is arranged on the milk inlet part in a communicated mode. The milk outlet part is further provided with an extrusion unit matched with the milk outlet unit, cleaning water flow enters the milk inlet part from the water inlet part, and when the extrusion unit extrudes the milk outlet unit, the sectional area of the inner hole diameter of the milk outlet unit is reduced till the sectional area of the inner hole diameter of the milk outlet unit is reduced to be approximate to the sectional area of the inner hole diameter of the milk inlet unit. The pressure in the milk inlet part is close to the pressure in the milk outlet part, and the cleaning water flow is discharged from the milk inlet unit and the milk outlet unit at the same time, so that the effect of cleaning the interior of the milk inlet part and the interior of the milk outlet part at the same time is achieved. Through the extrusion effect of the extrusion unit on the milk outlet pipe, the sectional area of the internal aperture of the milk outlet pipe is reduced, and internal clean water is discharged from the milk inlet pipe and the milk outlet pipe at the same time.

Description

Technical Field

[0001] The invention relates to the field of coffee machines, and in particular to a cleaning structure for a milk pipe of a coffee machine. Background Art

[0002] With the spread of coffee culture, coffee has been integrated into the lives of ordinary people, and various coffee machines have entered ordinary citizens' homes in large numbers. With the popularity of home coffee machines, many people are keen to make coffee at home. Since pure coffee is very bitter, in order to increase the taste of coffee, many people like to drink coffee with milk. After adding milk, coffee tastes smoother and smoother. In addition to the rich coffee aroma, there is also a light milk aroma. Science has proven that drinking a moderate amount of coffee milk every day is good for the heart and brain.

[0003] After each use, some milk will remain in the milk pipe of the coffee machine, which will cause deterioration and scaling over time, so it needs to be cleaned in time. When cleaning, cleaning water is usually passed into the milk frother, but because the cross-sectional area of ​​the tube diameter in the milk outlet pipe is usually larger than the cross-sectional area of ​​the tube diameter of the milk suction hole, the pressure difference between the inside and the outside cannot discharge the internal cleaning water, so the pipes and holes in the milk inlet and outlet parts cannot be fully flushed, which will cause deterioration and scaling over time, affecting health. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cleaning structure for a milk pipe of a coffee machine in view of the current status of the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a cleaning structure for a milk pipe line of a coffee machine, comprising a mounting frame, a milk inlet and a milk outlet connected to the milk inlet are provided on the mounting frame, a milk inlet unit and a milk outlet unit are provided on the milk inlet and the milk outlet respectively, the milk inlet is connected to a water inlet for entering a cleaning water flow, the milk outlet is also provided with a squeezing unit matched with the milk outlet unit, the cleaning water flow enters the milk inlet from the water inlet, when the squeezing unit squeezes the milk outlet unit, the cross-sectional area of ​​the internal aperture of the milk outlet unit is reduced until the cross-sectional area of ​​the internal aperture of the milk outlet unit is reduced to be similar to the cross-sectional area of ​​the internal aperture of the milk inlet unit, the pressure inside the milk inlet is close to the pressure inside the milk outlet, and the cleaning water flow is discharged from the milk inlet unit and the milk outlet unit at the same time, so as to achieve the effect of cleaning the inside of the milk inlet and the inside of the milk outlet at the same time.

[0006] Preferably, the milk inlet part includes an upper shell and a lower shell connected to each other, the milk inlet unit includes a milk inlet pipe arranged at the bottom of the lower shell, a milk passage and a cavity are arranged inside the milk inlet part, the milk inlet pipe is connected to the milk passage through a milk suction hole, and the milk passage is connected to the cavity through a milk outlet hole.

[0007] Preferably, the milk outlet unit comprises a milk outlet pipe, the lower shell is extended toward the milk outlet part and is provided with a nipple, the nipple is communicated with the inside of the cavity, the milk outlet pipe is connected to the nipple, and the milk outlet pipe is communicated with the inside of the cavity through the nipple.

[0008] Preferably, the extrusion unit is arranged on a mounting frame, and the extrusion unit includes a motor, a cam is connected to the motor output shaft, and the cam is provided with a protrusion for extruding the outer wall of the milk tube. The motor drives the cam to rotate, and the protrusion squeezes the outer wall of the milk tube, and the internal aperture cross-sectional area of ​​the milk tube is reduced.

[0009] Preferably, the aperture of the milk suction hole is smaller than that of the milk outlet hole, and a milk suction tube is connected to the outside of the milk inlet tube; the water inlet portion comprises a steam pipe arranged on the upper shell body, and the upper shell body is also provided with an air pipe for taking in air, the inside of the air pipe and the inside of the steam pipe are both connected to the milk passage, the steam pipe passes steam into the milk inlet portion during the process of making milk foam, and when cleaning is required, the temperature is reduced, and the steam pipe passes hot water for cleaning into the milk inlet portion.

[0010] Preferably, the milk outlet tube is connected to a connecting tube, which is provided with a protrusion protruding toward the extrusion unit, and the inside of the protrusion is a movable cavity for moving the extrusion unit; a through hole is provided in the connecting tube for the extrusion unit to pass through, and the through hole connects the inside of the connecting tube and the movable cavity, and the extrusion unit extends into the inside of the connecting tube through the through hole.

[0011] Preferably, one end of the extrusion unit is connected to a driving unit for driving the extrusion unit to move, and the other end of the extrusion unit extends into the interior of the connecting tube. The extrusion unit includes a push rod and a plug arranged at the front end of the push rod, and the end of the push rod away from the plug is loosely connected to the driving unit; a sealing ring is sleeved on the push rod, and the sealing ring and the push rod move synchronously, and the inner wall of the moving cavity is provided with a first inclined surface and a second inclined surface that interfere with the sealing ring.

[0012] Preferably, the driving unit includes an electromagnet, to which an output rod is connected, and the output rod is loosely connected to the push rod. The electromagnet can push the push rod to move through the output rod by applying a small force, so that the plug extends into the interior of the extrusion connecting tube until the cross-sectional area of ​​the internal aperture of the connecting tube is reduced to a level similar to the cross-sectional area of ​​the aperture of the milk suction hole.

[0013] Preferably, a spring is sleeved on the push rod, and the spring is arranged outside the protruding member, one end of the spring is in contact with the outer wall of the protruding member, and the other end of the spring is in contact with the push rod.

[0014] Compared with the prior art, the present invention has the advantages that: through the squeezing effect of the squeezing unit on the milk outlet pipe, the cross-sectional area of ​​the internal aperture of the milk outlet pipe is reduced to be similar to the cross-sectional area of ​​the aperture of the milk suction hole, and the pressure inside the milk inlet part is close to the pressure inside the milk outlet part, which is sufficient to discharge the clean water inside the milk frother from the milk inlet pipe and the milk outlet pipe to the outside at the same time, so as to achieve the effect of cleaning the inside of the milk inlet part and the inside of the milk outlet part at the same time, so that no additional excessive operations are required during cleaning, and the cleaning of the milk outlet pipe and the milk inlet pipe can be completed. At the same time, no matter whether the highest water level of the external pipeline of the milk suction pipe is higher or lower than the milk frother, water can be discharged to achieve the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a cross-sectional structural schematic diagram of the present invention; Figure 4 is a schematic structural diagram of Embodiment 2 of the present invention; Figure 5 1 is a schematic cross-sectional structure diagram of the electromagnet in a power-off state in Embodiment 2 of the present invention; Figure 6 It is a schematic cross-sectional structure diagram of the electromagnet in the energized state according to Embodiment 2 of the present invention.

[0016] Figure numerals: 1, milk inlet; 2, milk outlet; 3, upper shell; 4, lower shell; 5, milk inlet pipe; 6, milk passage; 7, cavity; 8, milk suction hole; 9, milk outlet hole; 10, milk outlet pipe; 11, nipple; 12, mounting frame; 13, motor; 14, cam; 15, raised part; 16, milk suction pipe; 17, air pipe; 18, steam pipe; 19, connecting pipe; 20, raised part; 21, moving cavity; 22, through hole; 23, push rod; 24, plug; 25, sealing ring; 26, first inclined surface; 27, second inclined surface; 28, electromagnet; 29, output rod; 30, spring. DETAILED DESCRIPTION

[0017] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0018] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back... are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] Moreover, some of the above terms may be used to express other meanings besides indicating orientation or positional relationships. For example, the term "on" may also be used to indicate a certain dependency or connection relationship in certain cases. A person skilled in the art may understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0020] In addition, the terms "install", "set", "provided with", "connect", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. The connection methods involved in this article are prior arts, without any improvement, and are all common knowledge of those skilled in the art. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Example 1

[0022] like Figures 1 to 3As shown, the present invention provides a cleaning structure for a milk pipe line, comprising a mounting frame 12, on which a milk inlet 1 and a milk outlet 2 connected with the milk inlet 1 are provided, the milk inlet 1 and the milk outlet 2 are provided with a milk inlet unit and a milk outlet unit respectively, the milk inlet 1 is connected with a water inlet for entering a cleaning water flow; specifically, the milk outlet 2 is further provided with a squeezing unit cooperating with the milk outlet unit, the cleaning water flow enters the milk inlet 1 from the water inlet, when the squeezing unit squeezes the milk outlet unit, the cross-sectional area of ​​the internal aperture of the milk outlet unit decreases until the cross-sectional area of ​​the internal aperture of the milk outlet unit decreases to be similar to the cross-sectional area of ​​the internal aperture of the milk inlet unit, the pressure inside the milk inlet 1 is close to the pressure inside the milk outlet 2, and the cleaning water flow is discharged from the milk inlet unit and the milk outlet unit at the same time, so as to achieve the effect of cleaning the inside of the milk inlet 1 and the inside of the milk outlet 2 at the same time.

[0023] The milk inlet part 1 includes an upper shell 3 and a lower shell 4 connected to each other, the milk inlet unit includes a milk inlet pipe 5 arranged at the bottom of the lower shell 4, and a milk passage 6 and a cavity 7 are arranged inside the milk inlet part 1; specifically, the milk inlet pipe 5 is connected to the milk passage 6 through a milk suction hole 8, and the milk passage 6 is connected to the cavity 7 through a milk outlet hole 9.

[0024] The milk outlet unit includes a milk outlet pipe 10, and the lower shell 4 is extended toward the milk outlet part 2 and is provided with a nipple 11; specifically, the nipple 11 is communicated with the inside of the cavity 7, and the milk outlet pipe 10 is connected to the nipple 11, and the milk outlet pipe 10 is communicated with the inside of the cavity 7 through the nipple 11.

[0025] The squeezing unit is arranged on the mounting frame 12, and the squeezing unit includes a motor 13, and a cam 14 is connected to the output shaft of the motor 13; specifically, the cam 14 is provided with a protrusion 15 for squeezing the outer wall of the milk outlet tube 10, the motor 13 drives the cam 14 to rotate, and the protrusion 15 squeezes the outer wall of the milk outlet tube 10, and the internal aperture cross-sectional area of ​​the milk outlet tube 10 is reduced.

[0026] The aperture of the milk suction hole 8 is smaller than that of the milk outlet hole 9, and a milk suction tube 16 is connected to the outside of the milk inlet tube 5; specifically, the water inlet portion includes a steam pipe 18 provided on the upper shell 3, and the upper shell 3 is also provided with an air pipe 17 for air intake, and the inside of the air pipe 17 and the inside of the steam pipe 18 are both connected to the milk passage 6. The steam pipe 18 passes steam into the milk inlet portion 1 during the process of making milk foam, and when cleaning is required, the temperature is reduced, and the steam pipe 18 passes hot water for cleaning into the milk inlet portion 1. The steam pipe 18 is connected to an external boiler.

[0027] The working principle of this embodiment is as follows: during the process of making milk foam, high-speed jet steam enters the milk passage 6 through the steam pipe 18, and then enters the cavity 7 through the milk outlet hole 9, so that the interior of the milk foamer is filled with steam, and negative pressure is formed inside the milk foamer, so that milk is sucked into the cavity 7 from the milk inlet pipe 5. At the same time, the air pipe 17 presses the outside air into the milk foamer, so that air is mixed into the milk to form a foamed state, and the foamed milk is then discharged through the milk outlet pipe 10; When it is necessary to clean the internal pipeline of the milk frother, the temperature in the steam pipe 18 is reduced, and the hot cleaning water in the boiler enters the milk inlet part 1 through the steam pipe 18. Since the cross-sectional area of ​​the pipe diameter in the milk outlet pipe 10 is usually larger than the cross-sectional area of ​​the pipe diameter of the milk suction hole 8, the internal and external air pressure difference cannot discharge the internal cleaning water. At this time, the user can turn on the motor 13, and the output shaft of the motor 13 drives the cam 14 to rotate. During the rotation of the cam 14, the protrusion 15 squeezes the outer wall of the milk outlet pipe 10, so that the internal pore cross-sectional area of ​​the milk outlet pipe 10 is reduced, until the internal pore cross-sectional area of ​​the milk outlet pipe 10 is reduced to be similar to the pore cross-sectional area of ​​the milk suction hole 8, and the pressure inside the milk inlet part 1 is close to the pressure inside the milk outlet part 2, and the cleaning water flow is discharged from the milk inlet pipe 5 and the milk outlet pipe 10 at the same time, so as to achieve the effect of cleaning the inside of the milk inlet part 1 and the inside of the milk outlet part 2 at the same time.

[0028] The advantage of this embodiment is that: through the squeezing effect of the squeezing unit on the milk outlet pipe 10, the cross-sectional area of ​​the internal aperture of the milk outlet pipe 10 is reduced to be similar to the cross-sectional area of ​​the aperture of the milk suction hole 8, and the pressure inside the milk frother is greater than the external pressure, which is sufficient to discharge the clean water inside the milk frother from the milk inlet pipe 5 and the milk outlet pipe 10 to the outside at the same time, so as to achieve the effect of simultaneously cleaning the inside of the milk inlet part 1 and the inside of the milk outlet part 2, so that no additional excessive operations are required during cleaning, and the cleaning of the milk outlet pipe 10 and the milk inlet pipe 5 can be completed. At the same time, no matter whether the highest water level of the external pipeline of the milk suction pipe 16 is higher or lower than the milk frother, water can be discharged to achieve the cleaning effect. Example 2

[0029] like Figures 4 to 6 As shown, what is different from Example 1 is that in this embodiment, a connecting tube 19 is connected to the milk outlet tube 10, and the connecting tube 19 is provided with a protrusion 20 protruding toward the extrusion unit, and the inside of the protrusion 20 is a movable cavity 21 for moving the extrusion unit; specifically, a through hole 22 for the extrusion unit to pass through is provided in the connecting tube 19, and the through hole 22 connects the inside of the connecting tube 19 and the movable cavity 21, and the extrusion unit extends into the inside of the connecting tube 19 through the through hole 22.

[0030] One end of the extrusion unit is connected to a driving unit for driving the extrusion unit to move, and the other end of the extrusion unit extends into the connecting tube 19. The extrusion unit includes a push rod 23 and a plug 24 arranged at the front end of the push rod 23, and the end of the push rod 23 away from the plug 24 is loosely connected to the driving unit; specifically, a sealing ring 25 is sleeved on the push rod 23, and the sealing ring 25 and the push rod 23 move synchronously, and the inner wall of the moving cavity 21 is provided with a first inclined surface 26 and a second inclined surface 27 that cooperate with the sealing ring 25.

[0031] The driving unit includes an electromagnet 28, to which an output rod 29 is connected, and the output rod 29 is loosely connected to the push rod 23; specifically, the electromagnet 28 can push the push rod 23 to move through the output rod 29 by applying a small force, so that the plug 24 extends into the interior of the extrusion connecting tube 19 until the cross-sectional area of ​​the internal aperture of the connecting tube 19 is reduced to be similar to the cross-sectional area of ​​the aperture of the milk suction hole 8.

[0032] The push rod 23 is sleeved with a spring 30, which is arranged outside the protruding member 20, one end of the spring 30 is in contact with the outer wall of the protruding member 20, and the other end of the spring 30 is in contact with the push rod 23. Other structures are the same as those in the first embodiment.

[0033] The working principle of this embodiment is as follows: when the electromagnet 28 is powered off, the plug 24 does not extend into the connecting tube 19, the plug 24 is located in the through hole 22, the sealing ring 25 on the push rod 23 is in contact with the second inclined surface 27, so as to prevent the milk from leaking out of the moving cavity 21 to the outside during the milk froth making process, and the spring 30 is in a relaxed state; When the milk froth is finished and the inside of the milk frother needs to be cleaned, the temperature inside the steam pipe 18 is lowered, and the cleaning hot water in the boiler enters the milk inlet part 1 through the steam pipe 18, and the electromagnet 28 is started. When the electromagnet 28 is energized, the output rod 29 on the electromagnet 28 pushes the push rod 23 and the plug 24 to move toward the connecting pipe 19. Since the push rod 23 and the output rod 29 are loosely connected, the electromagnet 28 only needs a small force to push the push rod 23, and does not need to withstand additional resistance. Only a small-sized electromagnet is needed. The magnet 28 can achieve this; the plug 24 gradually extends into the interior of the connecting tube 19, the spring 30 is compressed, and the cross-sectional area of ​​the internal aperture of the connecting tube 19 is gradually reduced until the sealing ring 25 on the push rod 23 and the first inclined surface 26 are in contact and connected, and the cross-sectional area of ​​the internal aperture of the connecting tube 19 is reduced to be similar to the cross-sectional area of ​​the aperture of the milk suction hole 8, and the pressure inside the milk inlet part 1 is close to the pressure inside the milk outlet part 2, and the cleaning water flow is discharged from the milk inlet pipe 5 and the milk outlet pipe 10 at the same time, so as to achieve the effect of cleaning the inside of the milk inlet part 1 and the inside of the milk outlet part 2 at the same time.

[0034] The advantage of this embodiment is that the cross-sectional area of ​​the internal aperture of the connecting tube 19 is reduced by the squeezing effect of the squeezing unit on the pipeline unit, and the electromagnet 28 only needs a small force to push the push rod 23 without bearing additional resistance, which can be achieved by using an electromagnet 28 of very small specifications.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0036] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can all be customized according to the description in the specification and drawings. The specific connection methods of each part all adopt conventional means such as mature bolts, rivets, welding, and bonding in the prior art, which will not be described in detail here.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, various changes and variations can be made in the specific implementation methods and application scopes based on the ideas of the present invention. The content of this specification should not be understood as limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A cleaning structure for a milk pipe of a coffee machine, comprising a mounting frame, a milk inlet and a milk outlet connected to the milk inlet, a milk inlet unit and a milk outlet unit are respectively provided on the milk inlet and the milk outlet, and a water inlet for inletting cleaning water is connected to the milk inlet, characterized in that: The milk outlet portion is also provided with a squeezing unit cooperating with the milk outlet unit. Cleaning water flows into the milk inlet portion from the water inlet portion. When the squeezing unit squeezes the milk outlet unit, the cross-sectional area of ​​the internal aperture of the milk outlet unit decreases until the cross-sectional area of ​​the internal aperture of the milk outlet unit decreases to be similar to the cross-sectional area of ​​the internal aperture of the milk inlet unit. The pressure inside the milk inlet portion is close to the pressure inside the milk outlet portion. The cleaning water is discharged from the milk inlet unit and the milk outlet unit at the same time, thereby achieving the effect of cleaning the inside of the milk inlet portion and the inside of the milk outlet portion at the same time.

2. A milk pipe cleaning structure according to claim 1, characterized in that: The milk inlet part includes an upper shell and a lower shell connected to each other, the milk inlet unit includes a milk inlet pipe arranged at the bottom of the lower shell, a milk passage and a cavity are arranged inside the milk inlet part, the milk inlet pipe is connected to the milk passage through a milk suction hole, and the milk passage is connected to the cavity through a milk outlet hole.

3. A milk pipe cleaning structure according to claim 2, characterized in that: The milk outlet unit comprises a milk outlet pipe, a nipple is provided on the lower shell extending toward the milk outlet part, the nipple is communicated with the inside of the cavity, the milk outlet pipe is connected with the nipple, and the milk outlet pipe is communicated with the inside of the cavity through the nipple.

4. A cleaning structure for a milk pipe according to claim 3, characterized in that: The squeezing unit is arranged on the mounting frame, and comprises a motor, a cam is connected to the motor output shaft, and a protrusion is arranged on the cam for squeezing the outer wall of the milk outlet tube. The motor drives the cam to rotate, and the protrusion squeezes the outer wall of the milk outlet tube, and the internal aperture cross-sectional area of ​​the milk outlet tube is reduced.

5. The cleaning structure for a milk pipe according to claim 2, characterized in that: The aperture of the milk suction hole is smaller than that of the milk outlet hole, and a milk suction tube is connected to the outside of the milk inlet tube; the water inlet portion comprises a steam pipe arranged on the upper shell body, and the upper shell body is also provided with an air pipe for taking in air, the inside of the air pipe and the inside of the steam pipe are both connected with the milk passage, the steam pipe passes steam into the milk inlet portion during the process of making milk foam, and when cleaning is required, the temperature is reduced, and the steam pipe passes hot water for cleaning into the milk inlet portion.

6. The cleaning structure for a milk pipe according to claim 3, characterized in that: The milk outlet pipe is connected to a connecting pipe, which is provided with a protruding piece protruding toward the extruding unit, and the inside of the protruding piece is a moving cavity for moving the extruding unit; a through hole is provided in the connecting pipe for the extruding unit to pass through, the through hole connects the inside of the connecting pipe and the moving cavity, and the extruding unit extends into the inside of the connecting pipe through the through hole.

7. A cleaning structure for a milk pipe according to claim 6, characterized in that: One end of the extrusion unit is connected to a driving unit for driving the extrusion unit to move, and the other end of the extrusion unit extends into the interior of the connecting tube. The extrusion unit includes a push rod and a plug arranged at the front end of the push rod, and the end of the push rod away from the plug is loosely connected to the driving unit; a sealing ring is sleeved on the push rod, and the sealing ring and the push rod move synchronously, and the inner wall of the moving cavity is provided with a first inclined surface and a second inclined surface that cooperate with the sealing ring.

8. The cleaning structure for a milk pipe according to claim 7, characterized in that: The driving unit includes an electromagnet, which is connected to an output rod, which is loosely connected to a push rod. The electromagnet can push the push rod to move through the output rod by applying a small force, so that the plug extends into the interior of the extrusion connecting tube until the cross-sectional area of ​​the internal aperture of the connecting tube is reduced to a level similar to that of the aperture of the milk suction hole.

9. The cleaning structure for a milk pipe according to claim 7, characterized in that: A spring is sleeved on the push rod and arranged outside the protruding part. One end of the spring is in contact with the outer wall of the protruding part, and the other end of the spring is in contact with the push rod.

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