CN204483869U - A kind of soy bean milk making machine - Google Patents

Abstract

The utility model relates to small kitchen appliances, in particular to a soybean milk machine, which includes a machine head and a cup body. The machine head includes a machine head upper cover and a machine head lower cover. The bearing and rear end cover assembly, the rotor and the rotor shaft are integrated, the stator is fixed to the inner wall of the lower cover of the machine head, the rotor is set through the stator, and the front end of the rotor shaft passes through the front end bearing and the shaft hole and extends into the cup body, the front end The bearing positions the front end of the rotor shaft, the rear end cover assembly positions the rear end of the rotor shaft, and the front end bearing and the rear end cover assembly are fixed in the machine head. After adopting the above technical scheme, the structure of the whole machine is more compact, the weight is lighter, and the cost is lower, and the safety anti-overflow space of the machine head during pulping is increased, which not only increases the pulping capacity of the whole machine, but also reduces the slurry spillover risk. At the same time, the heat dissipation effect of the machine head is better, which not only reduces the risk of the machine head blowing up, but also improves the service life of the motor.

Description

a soybean milk machine

technical field

The utility model relates to small kitchen appliances, in particular to a soybean milk maker.

Background technique

Existing soybean milk machines on the market generally include a machine head and a cup body. The machine head includes an upper cover and a lower cover of the machine head. A motor is installed in the lower cover of the machine head. In the lower cover of the machine head, the overall volume of the machine head is relatively bulky, and because the motor needs to be set in the lower cover of the machine head, in order to ensure the installation and reliable fixing of the motor, the overall volume of the lower cover of the machine head is relatively large. The safe anti-overflow space of the soya-bean milk machine is small, so that the capacity of the soya-bean milk machine to make beverages is limited, and after a long time of heating and making pulp, the soy-milk machine may have a risk of slurry overflow.

At the same time, when the lower cover of the machine head is composed of a plastic lower cover and a metal lower cover, because the thermal conductivity of the plastic lower cover is poor and the heat insulation effect is good, the heat generated by the high-speed rotation of the motor is difficult to discharge out of the machine head through the plastic lower cover. The heat dissipation effect of the head is poor, and when the heat in the head reaches a certain limit, the air in the head will expand due to heat, which will cause the head of the soybean milk machine to have the risk of frying. And when the motor works at high temperature for a long time, the life of the motor will be greatly shortened.

Even if the lower cover of the machine head is a single-layer metal lower cover, when the motor is installed in the metal lower cover, the metal lower cover can conduct part of the heat to reduce the temperature of the machine head. However, there is still an installation gap between the motor and the lower metal cover. Due to the existence of the installation gap, the ability of the metal lower cover to conduct heat is limited, and the heat in the machine head cannot be completely conducted out of the machine head. In addition, the high-speed rotation of the motor will generate vibration energy, and the motor and the metal lower cover are generally rigidly connected. Therefore, vibration noise is prone to occur between the motor and the metal lower cover. When the noise value reaches a certain level, the resonance phenomenon of the whole machine will occur, affecting Consumers' normal life and drink making.

Utility model content

The purpose of the utility model is to provide a soybean milk maker with compact structure, safety and reliability, good heat dissipation effect and low vibration noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a soybean milk machine, including a machine head and a cup body, and the machine head includes a machine head upper cover and a machine head lower cover, and is characterized in that: the machine head lower cover A stator, a rotor, a rotor shaft, a front end bearing and a rear end cover assembly are arranged inside, the rotor and the rotor shaft are integrally structured, the stator is fixed to the inner side wall of the lower cover of the machine head, and the stator is arranged around the rotor, And the front end of the rotor shaft passes through the front end bearing and the shaft hole at the bottom of the lower cover of the machine head and extends into the cup body. The front end bearing positions the front end of the rotor shaft, and the rear end cover assembly is set on the rear end of the rotor shaft and The rear end of the rotor shaft is positioned, and the front end bearing and the rear end cover assembly are fixed in the machine head.

Further, the outer side of the stator has an annular magnetic permeable coil, and the thickness of the annular magnetic permeable coil is 1mm-5mm.

Further, the lower cover of the machine head has a barrel-shaped installation part for installing the stator, the ring-shaped magnetic coil is a barrel-shaped installation part, and the barrel-shaped installation part is made of a material with magnetic permeability;

Alternatively, the annular magnetically permeable ring is a magnetically permeable layer arranged on the outer side wall or the inner sidewall of the lower cover of the machine head, and the magnetically permeable layer is located on the lower cover of the machine head corresponding to the stator;

Alternatively, the annular magnetic permeable ring is located between the stator and the lower cover of the machine head, and is clamped and fixed by the stator and the inner side wall of the lower cover of the machine head.

Further, the lower cover of the machine head is provided with an annular mounting frame, the stator is fixed on the inner side of the annular mounting frame, and the outer side of the annular mounting frame is integrally fixed with the lower machine head cover.

Further, the front end of the front end bearing is provided with a shaft seal, and the shaft seal is sleeved on the rotor shaft, and the front end bearing presses the shaft seal on the shaft hole.

Further, the lower cover of the machine head is provided with a fixing plate, the front end bearing is fixed on the fixing plate, and the fixing plate is fixed on the bottom of the lower cover of the machine head.

Further, an upwardly extending connecting bracket is provided on the fixing plate, the connecting bracket is located between the stator and the rotor, and the rear end cover assembly is fixedly connected to the connecting bracket.

Further, an installation step is arranged on the inner side of the lower cover of the machine head above the stator, and the rear end cover assembly is fixed on the installation step;

Alternatively, an installation step is arranged on the inner side of the lower cover of the machine head above the stator, and a holding member is also arranged in the machine head, and the rear end cover assembly is pressed on the installation step by the holding member;

Alternatively, the rear end cover assembly is fixed on the upper cover of the machine head;

Alternatively, the machine head is provided with a control board assembly, and the rear end cover assembly is fixed under the control board assembly;

Alternatively, the rear end cover assembly is fixed on the stator.

Further, the rear cover assembly is radially limited in the lower cover of the machine head.

Further, the inner side wall of the lower cover of the machine head is provided with an insulating layer.

After adopting the above technical scheme, since the stator, rotor, rotor shaft, front end bearing, rear end cover assembly and the lower cover of the machine head are integrally structured, compared with the traditional soybean milk machine motor shell and the lower cover of the machine head are fixed by screws, the utility model The lower cover of the machine head also has the function of the motor shell, and all parts of the motor are integrated in the lower cover of the machine head. Compared with the prior art, the structure of the soymilk machine of the utility model is more compact, which not only reduces parts and weight of the machine head, but also lowers the cost of the whole machine. At the same time, since the motor is directly integrated in the lower cover of the machine head, the diameter of the lower cover of the machine head can be smaller, and the overflow-proof space of the whole machine can be increased correspondingly. Not only the capacity of the soybean milk machine can be increased, but also It can effectively reduce the risk of slurry overflow and greatly improve the safe use performance of the soybean milk machine. Moreover, the frictional heat generated by the high-speed rotation of the rotor shaft can also be directly transmitted to the outside of the machine head through the lower cover of the machine head, especially when the lower cover of the machine head is a single-layer metal lower cover, the heat conduction effect is better, and the machine head can be greatly reduced. The internal heat and the temperature rise of the motor not only improve the safety performance of the whole machine, but also greatly prolong the service life of the motor. In addition, due to the integrated structure of the stator, rotor, rotor shaft, front end bearing, rear end cover assembly and the lower cover of the machine head, compared with the rigid connection between the motor shell and the lower cover of the machine head of the traditional soymilk machine, the soymilk of the present utility model When the machine is making pulp, there will be no rigid vibration collision between the motor casing and the lower cover of the machine head, so the noise value of the soybean milk machine is lower, and resonance is not easy to occur, which improves the comfort experience of consumers when using the soybean milk machine. Moreover, after the stator, rotor, rotor shaft, front end bearing, and rear end cover assembly of the utility model are integrally assembled with the lower cover of the machine head to form an assembly, it is conducive to the standardization of the lower cover assembly of the machine head, and can greatly improve the assembly efficiency of the whole machine. Reduce assembly costs.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the structural representation of the utility model embodiment one;

Fig. 2 is the structural representation of the second embodiment of the utility model;

Fig. 3 is the structural representation of the utility model embodiment three;

Fig. 4 is a schematic structural diagram of Embodiment 4 of the present utility model.

Detailed ways

Embodiment one:

As shown in FIG. 1 , it is a structural schematic diagram of Embodiment 1 of the present utility model. A soybean milk machine, including a machine head and a cup body (not shown in the figure), the machine head includes a machine head upper cover and a machine head lower cover 1, and a stator 2 and a rotor 3 are arranged in the machine head lower cover 1 , the rotor shaft 4 integrated with the rotor 3, the front end bearing 51 for positioning the front end of the rotor shaft 4, and the rear end cover assembly 6 for positioning the rear end of the rotor shaft 4, the inner side wall of the stator 2 and the lower cover 1 of the machine head Fixed as a whole, the stator 2 is arranged around the rotor 3, and the front end of the rotor shaft 4 passes through the front end bearing 51 and the shaft hole 11 at the bottom of the lower cover of the machine head and extends into the cup body, and the front end bearing 51 and the rear end cover assembly 6 are fixed in the nose.

Wherein, in this embodiment, the lower cover of the machine head is a metal lower cover with magnetic properties, the front end bearing is welded to the shaft hole 11 at the bottom of the metal lower cover, and the front end bearing is a waterproof sealed bearing, and its structure is A waterproof sealing ring is arranged on the bearing, and the front end bearing realizes waterproof sealing while positioning the rotor shaft, which can prevent water or water vapor from the outside of the machine head from entering the machine head through the shaft hole 11, so as to avoid water and water entering the machine head. Slag causes damage to electrical components and affects food hygiene and safety. At the same time, since the front end bearing is a waterproof and sealed bearing, there is no need to install a separate shaft seal structure on the rotor shaft, which further reduces the parts of the whole machine and saves costs. The rear end cover assembly 6 includes a rear end bearing 61 and a rear end cover 62 for fixing the rear end bearing 61 , and the rear end cover 62 is fixed on the lower cover 1 of the machine head by screws a. Due to the fixation of the screw a, the rear end cover 62 is radially limited in the lower cover of the machine head, so that the rear end cover assembly can reliably position the rear end of the rotor shaft 4, so as to prevent the rotor shaft 4 from being relatively tight during rotation. With a large swing range, the rear end bearing and the rear end cover can be made in one piece, or can be assembled into an integrated structure.

In this embodiment, the stator 2 is fixed on the inner side wall of the lower metal cover by gluing, so that the stator 2 is firmly installed, and the stator 2 is not easy to loosen from the lower metal cover. The stator 2 in this embodiment is a permanent magnet, the rotor 3 is a coil winding, and the rear end cover assembly 6 also includes a carbon brush, a commutator and a cooling fan (not marked in the figure), and the commutator and the cooling fan are both Installed on the rear end of the rotor shaft 4, the current direction is converted through the commutator, the rotor shaft 4 and the rotor 3 continue to rotate, and drive the cooling fan to rotate, which accelerates the air circulation in the machine head and realizes rapid heat dissipation of the machine head. Due to the high-speed friction between the carbon brush and the commutator during the rotation of the rotor shaft 4, a large amount of carbon powder will be generated. Since the carbon powder has good electrical conductivity, and the metal lower cover also has electrical conductivity, in order to prevent the metal lower cover from passing through the carbon The powder is electrically connected with the charged carbon brush to cause electric shock accidents when consumers use it. In this embodiment, an insulating layer 12 is also provided on the inner side wall of the metal lower cover, and the insulating layer can extend downward to the bottom of the metal lower cover.

In this embodiment, since the stator, rotor, rotor shaft, front end bearing, rear end cover assembly and the lower cover of the machine head are integrally structured, compared with the detachable connection between the motor of the traditional soybean milk machine and the lower cover of the machine head, the utility model The motor casing of the motor and the lower cover of the machine head are the same part, which reduces the number of parts of the machine head, not only reduces the weight of the whole machine, but also makes the cost of the whole machine lower. Moreover, compared with the prior art, since the lower cover of the machine head also has the function of the motor housing, the diameter of the lower cover of the machine head can be smaller, and the overflow-proof space of the whole machine is correspondingly increased, which not only increases the amount of soybean milk The pulping capacity of the soybean milk machine can also effectively reduce the risk of slurry overflow during pulping, and greatly improve the safe use performance of the soybean milk machine. At the same time, the frictional heat generated by the high-speed rotation of the rotor shaft can be directly transmitted to the outside of the machine head through the lower cover of the machine head. Especially in this embodiment, the lower cover of the machine head is a metal lower cover, which has better heat conduction effect and can greatly reduce The internal heat and the temperature rise of the motor not only improve the safety performance of the whole machine, but also greatly improve the life of the motor. In addition, due to the integrated structure of the stator, rotor, rotor shaft, front end bearing, rear end cover assembly and the lower cover of the machine head, compared with the rigid connection between the motor shell and the lower cover of the machine head of the traditional soymilk machine, the soymilk of the present utility model When the machine is making pulp, there will be no rigid vibration collision between the motor casing and the lower cover of the machine head, so the noise value of the soybean milk machine is lower, and resonance is not easy to occur, which improves the comfort experience of consumers when using the soybean milk machine. Moreover, the utility model has a compact and reliable structure, which greatly improves the assembly efficiency of the whole machine. Moreover, after the stator, rotor, rotor shaft, front end bearing, rear end cover assembly and machine head lower cover of the utility model are integrally assembled to form an assembly, the assembly efficiency of the whole machine can be greatly improved and the assembly cost can be reduced.

It should be noted that, in this embodiment, the stator is not limited to being fixed on the inner side wall of the lower cover of the machine head by gluing, and can also be installed by means of embedded fitting, clip fitting, riveting, screw fixing and the like. Moreover, the stator can also be a coil winding. At this time, the coil winding can be wound on the ring mounting frame, and then the ring mounting frame can be fixed on the inner side wall of the lower cover of the machine head to realize the indirect fixed integration of the stator and the lower cover of the machine head. . And, when the stator is a coil winding, the rotor is a permanent magnet. When it is a brushed motor, there are carbon brushes and commutators in the rear end cover assembly, and when it is a brushless motor, there are no carbon brushes and commutator in the rear end cover assembly, but it is controlled by an electronic control program. change direction. It should also be noted that in this embodiment, the fixing of the front end bearing and the lower cover of the machine head is not limited to welding, and a cavity for accommodating the front end bearing can also be provided at the shaft hole at the bottom of the lower cover of the machine head, and the front end bearing can be embedded In the concave cavity, or clamped, riveted, screwed and other methods. Of course, the front end bearing can be either a ball bearing or a sliding bearing. For this embodiment, when the lower cover of the machine head is a single-layer metal lower cover, the heat dissipation effect of the machine head is the best. And when the lower cover of the machine head is a single-layer plastic lower cover, the vibration noise value of the machine head is lower, and the cost is also lower. And when the lower cover of the machine head is a plastic lower cover and a metal lower cover, or when the lower cover of the machine head is a double-layer metal lower cover structure, the overall strength of the machine head is stronger, and it is not easy to break. It should be noted that the above-mentioned structures and structural modifications of this embodiment can also be applied to other embodiments of the present utility model.

Embodiment two:

As shown in FIG. 2 , it is a schematic structural diagram of Embodiment 2 of the present utility model. The difference from Embodiment 1 is that in this embodiment, the lower head cover 1 has a barrel-shaped mounting part 13 for installing the stator 2, and an annular magnetic permeable ring 7 is arranged between the stator 2 and the lower head cover 1 , and the annular magnetic permeable ring 7 is clamped and fixed by the stator 2 and the barrel-shaped installation part 13 . Moreover, the rear end cover assembly 6 is fixed on the ring-shaped magnetic permeable ring 7 by screws b. A concave cavity 14 is provided at the bottom shaft hole 11 of the lower cover of the machine head, and a shaft seal 8 set on the rotor shaft 4 is arranged in the concave cavity. The front end bearing 51 is embedded in the concave cavity 14 and pressed tightly. The shaft seal 8 seals the rotor shaft 4 and the shaft hole 11 .

In this embodiment, the ring-shaped magnetically permeable ring is wrapped around the periphery of the stator, so as to form a closed magnetic field, which is beneficial for the rotor to continuously cut the magnetic field lines and rotate under force. And in this embodiment, the thickness of the annular magnetic coil is W. When W is small, that is, when W<1mm, because the thickness of the annular magnetic coil is small, the ability of the annular magnetic coil to gather the magnetic field is weak, so that the rotor and the The rotating force of the rotor shaft is small, the output speed and torque of the rotor shaft become weaker, and the performance of the soybean milk machine will be affected. And when W>5mm, the ability of the annular magnetic coil to gather the magnetic field is stronger, forming a magnetic field circuit is also stronger, the output torque and speed of the rotor and the rotor shaft are greatly improved, but at the same time, the overall volume of the machine head will also increase. Large size not only increases the weight of the machine head and the cost of the whole machine, but also reduces the overall anti-overflow space of the machine head, and there is a risk of slurry overflow during long-term pulping. Therefore, in this embodiment, the thickness W of the annular magnetic permeable coil is set to be 1 mm to 5 mm, wherein the annular magnetic permeable coil is preferably 1.5 mm to 3 mm.

It should be noted that, in this embodiment, when the barrel-shaped installation part of the lower cover of the machine head is made of a material with magnetic permeability (containing materials such as iron, cobalt, nickel and their alloys that can directly or indirectly generate magnetism), The barrel-shaped mounting part also has the function of gathering the magnetic field and forming a magnetic flux circuit, that is, the barrel-shaped mounting part is a ring-shaped magnetic conducting ring, and the rotor and the rotor shaft can also be rotated by the magnetic force. At this time, the lower cover of the machine head is thicker than the lower cover of the machine head in the prior art, and is generally preferably 1.5mm~2.5mm. Because the thickness of the lower cover of the machine head increases, the strength of the machine head of the soybean milk machine is stronger. Compared with the prior art, it is not easy to break or deform the lower cover of the machine head. And when the annular magnetic coil of this embodiment is installed between the barrel-shaped installation part and the stator, the annular magnetic coil has the functions of gathering magnetism and increasing magnetism, making the formed loop magnetic field stronger, and further improving the performance of the soya-bean milk maker. Overall pulping performance. In this embodiment, the fixing method of the ring-shaped magnetic coil and the lower cover of the machine head is the same as the fixing method of the stator and the lower cover of the machine head in Embodiment 1. Therefore, the fixing method of the stator and the lower cover of the machine head is not limited to direct fixing. It can be indirectly fixed on the inner side wall of the lower cover of the machine head through the annular magnetic ring. It should also be noted that, in this embodiment, the rear end cover assembly is fixed on the annular magnetic permeable ring, and the rear end cover assembly may also be directly fixed on the stator. It should be noted that the above-mentioned structures and structural modifications of this embodiment can also be applied to other embodiments of the present utility model.

Embodiment three:

As shown in Figure 3, it is the third embodiment of the present utility model. The difference between this embodiment and the preceding embodiments is that in this embodiment, a fixing member 52 for fixing the front end bearing 51 is provided inside the machine head, and the fixing member 52 is fixed from the outside of the lower cover 1 of the machine head by screws c At the bottom of the lower cover 1 of the machine head. And the edge of the fixing part 52 is provided with a connecting bracket 53 extending upwards and penetrating the center of the stator 2. The rear end cover 62 and the connecting bracket 53 are fixed together by screws d. The radial limit of the edge of the cover 62 can prevent the rear end cover from being unable to position the rear end of the rotor shaft due to radial swing. In addition, the outer wall of the barrel-shaped mounting part 13 is provided with an annular magnetically permeable ring 7, the annular magnetically permeable ring 7 is located on the barrel-shaped mounting part 13 corresponding to the stator 2, and the annular magnetically permeable ring 7 is in line with the barrel-shaped mounting part 13 One-piece magnetically conductive layer.

In this embodiment, the thickness of the lower cover of the machine head is the same as that of the prior art, and in order to effectively enhance the force of the rotor and the rotor shaft and improve the pulping performance of the soymilk machine, in this embodiment, the thickness of the magnetic layer is generally preferably 1mm~4mm, within this range, while protecting the pulp performance of the soybean milk machine, the appearance of the whole machine can be realized, and the pulp can be safely produced, and the strength of the lower cover of the machine head is enhanced, and the phenomenon of breakage of the lower cover of the machine head is not easy to occur. The magnetically permeable layer can be a magnetically permeable coating sprayed on the lower cover of the machine head, or can be made integrally with the magnetically permeable parts and the lower cover of the machine head.

This embodiment has the same beneficial effects as the above-mentioned embodiments, which will not be repeated here. It should be pointed out that the magnetic permeable layer formed integrally with the lower cover of the machine head can also be located on the inner side wall of the lower cover of the machine head. The fixing method of the fixing member and the lower cover of the machine head is not limited to the screw fixing in this embodiment, and also can be welding, riveting, threaded connection and other installation methods. It should be noted that the above-mentioned structures and structural modifications of this embodiment can also be applied to other embodiments of the present utility model.

Embodiment four:

As shown in Figure 4, it is the fourth embodiment of the present utility model. The difference between this embodiment and the above-mentioned embodiments is that in this embodiment, the fixing member 52 is fixed to the bottom of the lower cover 1 of the machine head from the inside of the machine head through the screw e, and the upper cover 10 of the machine head is provided with a holding part 101 , the pressing part 101 presses the rear end cover 62 on the installation step 14 of the lower head cover 1 , and the lower head cover 1 is provided with limiting ribs 15 for radially limiting the rear end cover 62 .

In this embodiment, the rear end cover is pressed and fixed on the lower cover of the machine head by the pressing part, so that the disassembly and maintenance of the whole machine are more convenient. Since the rear end cover assembly has a positioning effect on the rear end of the rotor shaft, the installation of the rear end cover is not limited to the installation in this embodiment and the above embodiment, and can also be fixed in the machine head by other means. For example: the rear end cover is fixed on the upper cover of the machine head by hoisting, or the integrated board assembly or mounting bracket is arranged in the machine head, and the rear end cover is fixed on the integrated board assembly or mounting bracket by hoisting; or, The machine head is provided with an integrated plate assembly or a holding member, and the rear end cover is pressed and fixed on the lower cover of the machine head by the integrated plate assembly or the holding member by means of press fitting. In addition, the installation step in this embodiment can be horizontal or have a certain taper, and this structure is suitable for facilitating the installation of the rear end cover assembly. It should be noted that the above-mentioned structures and structural modifications of this embodiment can also be applied to other embodiments of the present utility model.

Those skilled in the art should understand that the present utility model includes but is not limited to the contents described in the accompanying drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present utility model shall be included in the scope of the claims.

Claims (10)

1. A soya-bean milk maker, comprising a head and a cup body, said head comprising a head upper cover and a head lower cover, characterized in that: said head lower cover is provided with a stator, a rotor, a rotor shaft, a front end Bearing and rear end cover assembly, the rotor and the rotor shaft are integrated, the stator is fixed to the inner side wall of the lower cover of the machine head, the stator is arranged around the rotor, and the front end of the rotor shaft passes through the front end bearing and the machine head The shaft hole at the bottom of the lower cover extends into the cup body. The front end bearing positions the front end of the rotor shaft. The rear end cover assembly fits over the rear end of the rotor shaft and positions the rear end of the rotor shaft. The bearing and rear end cover assembly are fixed in the machine head. 2. The soybean milk machine according to claim 1, characterized in that: the outer side of the stator has a ring-shaped magnetic coil, and the thickness of the annular magnetic coil is 1mm-5mm. 3. The soymilk machine according to claim 2, characterized in that: the lower cover of the machine head has a barrel-shaped installation part for installing the stator, the ring-shaped magnetic coil is a barrel-shaped installation part, and the barrel-shaped installation part has a guide Made of magnetic material; Alternatively, the annular magnetically permeable ring is a magnetically permeable layer arranged on the outer side wall or the inner sidewall of the lower cover of the machine head, and the magnetically permeable layer is located on the lower cover of the machine head corresponding to the stator; Alternatively, the annular magnetic permeable ring is located between the stator and the lower cover of the machine head, and is clamped and fixed by the stator and the inner side wall of the lower cover of the machine head. 4. The soybean milk machine according to claim 1 or 2, characterized in that: the lower cover of the machine head is provided with an annular mounting frame, the stator is fixed on the inner side of the annular mounting frame, and the outer side of the annular mounting frame is in contact with the machine head. The lower cover is fixed in one piece. 5. The soybean milk machine according to claim 1 or 2, characterized in that: the front end of the front end bearing is provided with a shaft seal, the shaft seal is sleeved on the rotor shaft, and the front end bearing presses the shaft seal on shaft hole. 6. The soybean milk maker according to claim 1 or 2, characterized in that: the lower cover of the machine head is provided with a fixing plate, the front end bearing is fixed on the fixing plate, and the fixing plate is fixed on the bottom of the lower cover of the machine head . 7. The soybean milk machine according to claim 6, characterized in that: said fixing plate is provided with an upwardly extending connecting bracket, said connecting bracket is located between the stator and rotor, and said rear end cover assembly is fixed to the connecting bracket connect. 8. The soymilk maker according to claim 1 or 2, characterized in that: the inner side of the lower cover of the machine head is located above the stator, and an installation step is arranged, and the rear end cover assembly is fixed on the installation step; Alternatively, an installation step is arranged on the inner side of the lower cover of the machine head above the stator, and a holding member is also arranged in the machine head, and the rear end cover assembly is pressed on the installation step by the holding member; Alternatively, the rear end cover assembly is fixed on the upper cover of the machine head; Alternatively, the machine head is provided with a control board assembly, and the rear end cover assembly is fixed under the control board assembly; Alternatively, the rear end cover assembly is fixed on the stator. 9. The soybean milk machine according to claim 1 or 2, characterized in that: the rear end cover assembly is radially limited in the lower cover of the machine head. 10. The soybean milk machine according to claim 1 or 2, characterized in that: the inner wall of the lower cover of the machine head is provided with an insulating layer.