Wheat flour mill

Abstract

The invention belongs to the technical field of grinding equipment, and discloses a wheat flour mill which comprises a shell with a hopper, a grinding unit is arranged in the shell, the grinding unit comprises an outer grinding body, a middle grinding body, an inner grinding body, an annular frame, a supporting frame and a pump body, inner cavities filled with liquid are formed in the outer grinding body, the middle grinding body and the inner grinding body, and the annular frame is arranged in the outer grinding body. An annular groove communicated with an inner cavity of the middle grinding body is formed in the middle grinding body, the outer grinding body is fixed to the inner wall of the shell, the middle grinding body is located between the outer grinding body and the inner grinding body, the annular frame is in sliding fit with the annular groove and connected with the supporting frame, the supporting frame is fixed to the shell, and two inner grooves are formed in the annular frame. A plurality of connecting holes are formed in the annular groove, a plurality of paddles are fixed to the annular groove, the inner grinding body is fixed to the supporting frame, and the pump body is fixed to the shell; according to the grinding device, the effective grinding area can be increased, the grinding speed is increased, and the outer grinding body, the middle grinding body and the inner grinding body can be cooled through liquid.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding equipment, in particular to a wheat flour mill. Background Art

[0002] During the production and processing of wheat, it is necessary to grind the wheat through a flour mill. Usually, the raw materials are ground by the cooperation of the inner and outer grinding surfaces. Due to the limited effective grinding area, the grinding efficiency of the raw materials is low. In addition, during the grinding process, as the two grinding surfaces continue to grind the raw materials, the temperature of the two grinding surfaces and the raw materials will also rise. If the temperature is too high due to continuous production, the quality of wheat processing will be reduced. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a wheat flour mill, which effectively solves the problem that the flour mill has low grinding efficiency for raw materials, and during the grinding process, as the two grinding surfaces continue to grind the raw materials, the temperature of the two grinding surfaces and the raw materials will also rise. If continuous production causes the temperature to be too high, the quality of wheat processing will be reduced.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wheat flour mill, comprising a shell with a hopper, a grinding unit is arranged in the shell, the grinding unit comprises an outer grinding body, a middle grinding body, an inner grinding body, an annular frame, a support frame, and a pump body, the outer grinding body, the middle grinding body, and the inner grinding body are all provided with an inner cavity filled with liquid, the middle grinding body is provided with an annular groove connected with its inner cavity, the outer grinding body is fixed to the inner wall of the shell, the middle grinding body is located between the outer grinding body and the inner grinding body, the annular frame is slidably matched with the annular groove, the annular frame is connected to the support frame, the support frame is fixed to the shell, two inner grooves are arranged on the annular frame, a plurality of connecting holes and a plurality of paddles are fixed on the annular groove, the inner grinding body is fixed to the support frame, and the pump body is fixed to the shell; One end of the pump body is connected to the inner cavity of the outer grinding body, the inner cavity of the outer grinding body is connected to an inner groove, one inner groove is connected to the inner cavity of the middle grinding body through an annular groove and corresponding connecting holes, the middle grinding body is connected to another inner groove through corresponding connecting holes and annular grooves, the other inner groove is connected to the inner cavity of the inner grinding body, and the inner cavity of the inner grinding body is connected to the pump body.

[0005] Preferably, the outer wall of the outer grinding body is provided with a cylindrical surface, the inner wall of the outer grinding body is provided with a conical outer grinding surface, and the longitudinal section of the outer grinding surface is an inverted eight-shaped structure.

[0006] Preferably, the outer wall and the inner wall of the middle grinding body are both provided with a conical middle grinding surface, and the outer wall and the inner wall of the middle grinding body are also provided with a conical introduction surface, the two introduction surfaces are respectively located above the two middle grinding surfaces, the longitudinal sections of the two introduction surfaces are a regular eight-shaped structure, the longitudinal section of the middle grinding surface located on the outer side is an inverted eight-shaped structure, and the longitudinal section of the middle grinding surface located on the inner side is a regular eight-shaped structure.

[0007] Preferably, the outer wall of the inner grinding body is provided with a conical inner grinding surface, and the longitudinal section of the inner grinding surface is a regular eight-shaped structure.

[0008] Preferably, the annular frame and the supporting frame are connected by a plurality of connecting pieces, the inner tops of the plurality of connecting pieces are connected by an upper tube body, the inner bottoms of the plurality of connecting pieces are connected by a lower tube body, the inner top of one of the connecting pieces is connected to one end of the pump body by an upper conduit, and the inner bottom of one of the connecting pieces is connected to the other end of the pump body by a lower conduit; solenoid valves are fixed on both ends of the pump body, the upper conduit and the lower conduit.

[0009] Preferably, the connecting member includes a lower cylinder, a piston and a connecting rod, the lower cylinder is fixed on the support frame, the piston is slidably arranged in the lower cylinder, and the piston is fixed to the annular frame through the connecting rod; an upper chamber and a lower chamber are formed in the lower cylinder by the piston, the upper chamber is connected to the upper conduit, the lower chamber is connected to the lower conduit, and the upper chambers of multiple connecting members are connected through the upper tube body, and the lower chambers of multiple connecting members are connected through the lower tube body.

[0010] Preferably, a screening unit is provided in the shell below the grinding unit, and the screening unit includes a screen, an elastic ring, a plurality of deformation cylinders, a vibration motor and a pressure relief valve. The screen is fixed to the shell through the elastic ring, a hollow cavity is formed in the screen, a plurality of deformation cylinders are passed through and fixed on the screen, the vibration motor is fixed to the bottom end of the screen, the inner cavity of the inner grinding body is connected to the hollow cavity, and a one-way valve is provided at the connection between the two, the hollow cavity is connected to the pressure relief valve, and the pressure relief valve is connected to the pump body.

[0011] Preferably, the deformable tube is made of silicone material, both ends of the deformable tube are open structures, and the middle part of the deformable tube is located in the hollow cavity.

[0012] Preferably, the screen is integrated with the elastic ring, and the screen is made of stainless steel.

[0013] Preferably, a rolling box is fixed between the shell and the hopper, and rolling rollers are symmetrically rotated in the rolling box. Transmission gears are fixed on the two rolling rollers, and the two transmission gears are meshed. A servo motor is fixed on the rolling box, and the output shaft of the servo motor is fixed to one of the rolling rollers.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. During operation, the outer grinding body, the middle grinding body, the inner grinding body, etc. can be matched with each other to grind with the outer grinding body and the inner grinding body respectively through the two sides of the middle grinding body, thereby increasing the effective grinding area and the grinding rate; 2. During operation, through the cooperation of the pump body, inner cavity, etc., in the process of liquid flow, not only the driving of the middle grinding body is realized, but also the temperature of the outer grinding body, middle grinding body and inner grinding body can be cooled by liquid to ensure that the temperature during the grinding operation is within a suitable range; and using liquid as the filler of the outer grinding body, middle grinding body and inner grinding body can improve the quality of the middle grinding body, thereby improving the stability during movement; 3. During operation, the position of the middle grinding body can be adjusted according to actual needs through the cooperation of the pump body, solenoid valve and connectors, so as to adjust the gap between the middle grinding body and the outer grinding body and the gap between the middle grinding body and the inner grinding body, so as to obtain different specifications of ground raw materials; 4. During operation, the screening unit can not only screen the raw materials after grinding, but also cool the screen by liquid, and adjust the liquid pressure in the hollow cavity by controlling the pressure relief threshold of the pressure relief valve to adjust the deformation of the deformation cylinder, thereby adjusting the effective passing area of ​​the deformation cylinder to adapt to the screening of raw materials of different specifications; 5. During operation, after the screening is completed, the effective passing area of ​​the deformation cylinder is adjusted by the pressure relief valve. When the deformation cylinder is deformed, the adhesion between the raw material and the deformation cylinder can be effectively reduced. As the effective passing area increases, the raw material can pass through the deformation cylinder, which can avoid the raw material blocking the deformation cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture: Figure 1 It is a structural schematic diagram of a wheat flour mill of the present invention; Figure 2 It is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 It is a schematic diagram of the matching structure of the outer grinding body, the middle grinding body and the inner grinding body of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of a longitudinal cross-sectional structure; Figure 5 For the present invention Figure 3 A is an enlarged structural diagram; Figure 6 For the present invention Figure 4 The enlarged structural diagram at B in FIG. Figure 7 For the present invention Figure 4 The enlarged structural diagram at C in FIG. Figure 8 For the present invention Figure 4 The enlarged structural diagram at D in FIG. Fig. 9 This is one of the schematic diagrams of the hopper structure of the present invention; Fig.10 This is the second schematic diagram of the hopper structure of the present invention.

[0017] In the figure: 1. shell; 2. hopper; 3. outer grinding body; 4. middle grinding body; 5. inner grinding body; 6. annular frame; 7. support frame; 8. pump body; 9. inner cavity; 10. annular groove; 11. inner groove; 12. connecting hole; 13. upper tube body; 14. lower tube body; 15. upper conduit; 16. lower conduit; 17. solenoid valve; 18. lower cylinder; 19. piston; 20. connecting rod; 21. upper chamber; 22. lower chamber; 23. screen; 24. elastic ring; 25. deformation cylinder; 26. vibration motor; 27. pressure relief valve; 28. hollow cavity; 29. ​​one-way valve; 30. paddle; 31. rolling box; 32. rolling roller; 33. transmission gear; 34. servo motor. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] During the production and processing of wheat, it is necessary to grind the wheat through a flour mill. Usually, the raw materials are ground by the cooperation of two inner and outer grinding surfaces. Since the effective grinding area is limited, the grinding efficiency of the raw materials is low. In addition, during the grinding process, as the two grinding surfaces continue to grind the raw materials, the temperature of the two grinding surfaces and the raw materials will also rise. If continuous production causes the temperature to be too high, the quality of wheat processing will be reduced. Therefore, this technical problem needs to be solved.

[0020] Depend on Figure 1-Figure 10The present invention relates to a wheat flour mill, comprising a shell 1 with a hopper 2, a grinding unit is arranged in the shell 1, and the grinding unit comprises an outer grinding body 3, a middle grinding body 4, an inner grinding body 5, an annular frame 6, a support frame 7, and a pump body 8. The outer grinding body 3, the middle grinding body 4, and the inner grinding body 5 are all provided with an inner cavity 9 filled with liquid, the middle grinding body 4 is provided with an annular groove 10 connected with its inner cavity 9, the outer grinding body 3 is fixed to the inner wall of the shell 1, the middle grinding body 4 is located between the outer grinding body 3 and the inner grinding body 5, the annular frame 6 is slidably matched with the annular groove 10, the annular frame 6 is connected with the support frame 7, the support frame 7 is fixed to the shell 1, two inner grooves 11 are arranged on the annular frame 6, a plurality of connecting holes 12 and a plurality of paddles 30 are fixed on the annular groove 10, the inner grinding body 5 is fixed on the support frame 7, and the pump body 8 is fixed on the shell 1; One end of the pump body 8 is connected to the inner cavity 9 of the outer grinding body 3, the inner cavity 9 of the outer grinding body 3 is connected to an inner groove 11, the inner groove 11 is connected to the inner cavity 9 of the middle grinding body 4 through the annular groove 10 and the corresponding connecting hole 12, the middle grinding body 4 is connected to another inner groove 11 through the corresponding connecting hole 12 and the annular groove 10, the other inner groove 11 is connected to the inner cavity 9 of the inner grinding body 5, and the inner cavity 9 of the inner grinding body 5 is connected to the pump body 8.

[0021] With this design, when in use, the hopper 2 is opened, the raw material is placed into the shell 1 through the hopper 2, the raw material is ground through the grinding unit in the shell 1, and finally discharged through the outlet of the shell 1. The specific process is as follows: the liquid in the inner cavity 9 of the inner grinding body 5 is sucked into the pump body 8 and transported to the inner cavity 9 of the outer grinding body 3, and the liquid in the inner cavity 9 of the outer grinding body 3 then enters an inner groove 11 on the annular frame 6, and the liquid impacts the paddle 30 in the annular groove 10, thereby driving the middle grinding body 4 to rotate through the paddle 30, and the middle grinding body 4 is driven to rotate through the middle grinding body 4. The body 4 acts as the main force to cooperate with the outer grinding body 3 and the inner grinding body 5 to grind the raw material. Since both sides of the middle grinding body 4 can perform grinding operations, the effective grinding area of ​​the raw material is increased, thereby improving the grinding efficiency; then the liquid in the annular groove 10 enters the inner cavity 9 of the middle grinding body 4 through the corresponding connecting hole 12, and then the liquid in the inner cavity 9 of the middle grinding body 4 enters the inner cavity 9 of the inner grinding body 5 through the corresponding connecting hole 12, annular groove 10, and inner groove 11 on the other side, and finally circulates by the pump body 8, thereby realizing the grinding operation of the raw material.

[0022] It should be noted that, during the flow of liquid, not only the driving of the middle grinding body 4 is realized, but also the outer grinding body 3, the middle grinding body 4, and the inner grinding body 5 can be cooled by the liquid to ensure that the temperature during the grinding operation is within a suitable range. In order to ensure effective cooling of the liquid, a heat exchange device can be connected in series to one end of the pump body 8, and the temperature of the liquid can be reduced by the heat exchange device to ensure the cooling effect of the liquid. And using liquid as a filler for the outer grinding body 3, the middle grinding body 4, and the inner grinding body 5 can improve the quality of the middle grinding body 4, thereby improving the stability during movement. And the motor can also be directly used to drive the middle grinding body 4 to rotate. At this time, the flow rate of the liquid can be reduced, and the driving force of the liquid on the blade 30 can be used as an auxiliary force to reduce the driving force required by the motor and reduce the load.

[0023] Furthermore, a crushing box 31 is fixed between the shell 1 and the hopper 2, and crushing rollers 32 are symmetrically rotated in the crushing box 31. Transmission gears 33 are fixed on the two crushing rollers 32, and the two transmission gears 33 are meshed together. A servo motor 34 is fixed on the crushing box 31, and the output shaft of the servo motor 34 is fixed to one of the crushing rollers 32.

[0024] With such a design, when in use, the corresponding rolling roller 32 is driven to rotate by the servo motor 34, and the two transmission gears 33 cooperate to make the two rolling rollers 32 move simultaneously. When the material falls from between the two rolling rollers 32, the rotating rolling roller 32 can crush the material to crush it into smaller particles for subsequent grinding operations.

[0025] Specifically, the outer wall of the outer grinding body 3 is provided with a cylindrical surface, and the inner wall of the outer grinding body 3 is provided with a conical outer grinding surface, and the longitudinal section of the outer grinding surface is an inverted eight-shaped structure.

[0026] Specifically, the outer wall and the inner wall of the middle grinding body 4 are both provided with a conical middle grinding surface, and the outer wall and the inner wall of the middle grinding body 4 are also provided with a conical introduction surface, the two introduction surfaces are respectively located above the two middle grinding surfaces, and the longitudinal sections of the two introduction surfaces are a regular eight-shaped structure, the longitudinal section of the middle grinding surface located on the outer side is an inverted eight-shaped structure, and the longitudinal section of the middle grinding surface located on the inner side is a regular eight-shaped structure.

[0027] Specifically, the outer wall of the inner grinding body 5 is provided with a conical inner grinding surface, and the longitudinal section of the inner grinding surface is a regular eight-shaped structure.

[0028] Taking into account that in the production process, it is sometimes necessary to obtain ground raw materials of different specifications, the annular frame 6 and the support frame 7 are connected by multiple connecting parts, the inner tops of the multiple connecting parts are connected through the upper tube body 13, and the inner bottoms of the multiple connecting parts are connected through the lower tube body 14. The inner top of one of the connecting parts is connected to one end of the pump body 8 through the upper conduit 15, and the inner bottom of one of the connecting parts is connected to the other end of the pump body 8 through the lower conduit 16; solenoid valves 17 are fixed on both ends of the pump body 8, the upper conduit 15 and the lower conduit 16.

[0029] Specifically, the connecting member includes a lower cylinder 18, a piston 19 and a connecting rod 20. The lower cylinder 18 is fixed on the support frame 7, and the piston 19 is slidably arranged in the lower cylinder 18. The piston 19 is fixed to the annular frame 6 through the connecting rod 20. An upper chamber 21 and a lower chamber 22 are formed in the lower cylinder 18 by the piston 19. The upper chamber 21 is connected to the upper conduit 15, and the lower chamber 22 is connected to the lower conduit 16. The upper chambers 21 of multiple connecting members are connected through the upper tube body 13, and the lower chambers 22 of multiple connecting members are connected through the lower tube body 14.

[0030] With such a design, when it is necessary to adjust the gap between the middle grinding body 4 and the outer grinding body 3 and the gap between the middle grinding body 4 and the inner grinding body 5, it is only necessary to close the solenoid valves 17 at both ends of the pump body 8, open the solenoid valves 17 on the upper conduit 15 and the lower conduit 16, and extract the liquid in each lower chamber 22 through the pump body 8 and the lower conduit 16, and then transport it to each upper chamber 21 through the upper conduit 15. Under the action of the liquid pressure, the position of the piston 19 in the lower cylinder 18 is changed, and the piston 19 drives the middle grinding body 4 to move longitudinally through the connecting rod 20 and the annular frame 6, thereby achieving the purpose of adjusting the gap between the middle grinding body 4 and the outer grinding body 3 and the gap between the middle grinding body 4 and the inner grinding body 5, so as to obtain ground raw materials of different specifications.

[0031] Taking into account that part of the raw materials fall without being fully ground during the grinding process, in order to achieve sufficient grinding of the raw materials, a screening unit located below the grinding unit is provided in the shell 1, and the screening unit includes a screen 23, an elastic ring 24, a plurality of deformation cylinders 25, a vibration motor 26 and a pressure relief valve 27. The screen 23 is fixed to the shell 1 through the elastic ring 24, a hollow cavity 28 is formed in the screen 23, a plurality of deformation cylinders 25 are all penetrated and fixed on the screen 23, the vibration motor 26 is fixed to the bottom end of the screen 23, the inner cavity 9 of the inner grinding body 5 is connected to the hollow cavity 28, and a one-way valve 29 is provided at the connection between the two, the hollow cavity 28 is connected to the pressure relief valve 27, and the pressure relief valve 27 is connected to the pump body 8.

[0032] With such a design, after the ground raw materials fall onto the top of the screen 23, the screen 23 is shaken by the vibration motor 26 in cooperation with the elastic ring 24, so that the raw materials are screened by the deformation cylinder 25 on the screen 23, and qualified raw materials are discharged through the outlet of the shell 1, while unqualified raw materials remain on the top of the screen 23. A side door can be provided on the side of the shell 1 to facilitate the removal of unqualified raw materials, or an external fan can be directly provided on the shell 1. After the screening is completed, the unqualified raw materials are transported to the top of the shell 1 again by the external fan for further grinding.

[0033] And the liquid in the inner cavity 9 of the inner grinding body 5 can flow into the hollow cavity 28 in the screen 23 through the one-way valve 29, and return to the pump body 8 after passing through the pressure relief valve 27. Since the shaking of the screen 23 will increase the temperature, the screen 23 can be cooled by the liquid, and the pressure of the liquid in the hollow cavity 28 can be adjusted by controlling the pressure relief threshold of the pressure relief valve 27 to adjust the deformation size of the deformation cylinder 25, thereby adjusting the effective passing area of ​​the deformation cylinder 25 to adapt to the screening of raw materials of different specifications.

[0034] It should be noted that after the screening is completed, the effective passing area of ​​the deformation cylinder 25 can be adjusted by the pressure relief valve 27. When the deformation cylinder 25 is deformed, the adhesion between the raw material and the deformation cylinder 25 can be effectively reduced. As the effective passing area increases, the raw material can pass through the deformation cylinder 25, which can avoid the raw material from clogging the deformation cylinder 25. The liquid can also be directly replaced by air, which can effectively reduce the overall weight of the equipment.

[0035] Specifically, the deformation tube 25 is made of silicone, rubber, polyurethane or a deformable material, both ends of the deformation tube 25 are open structures, and the middle part of the deformation tube 25 is located in the hollow cavity 28; it should be noted that a wear-resistant coating can be sprayed on the inner wall of the deformation tube 25 to reduce the wear of the deformation tube 25, and the thickness of the tube mouth at both ends of the deformation tube 25 is greater than the thickness of the middle part of the deformation tube 25, so that the middle part of the deformation tube 25 is easy to deform.

[0036] Specifically, the screen 23 and the elastic ring 24 are connected as a whole, and the screen 23 is made of stainless steel.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wheat flour mill, comprising a housing with a hopper, a grinding unit arranged in the housing, characterized in that: The grinding unit comprises an outer grinding body, a middle grinding body, an inner grinding body, an annular frame, a support frame, and a pump body. The outer grinding body, the middle grinding body, and the inner grinding body are all provided with inner cavities filled with liquid. The middle grinding body is provided with an annular groove connected with its inner cavity. The outer grinding body is fixed to the inner wall of the shell. The middle grinding body is located between the outer grinding body and the inner grinding body. The annular frame is slidably matched with the annular groove. The annular frame is connected to the support frame. The support frame is fixed to the shell. Two inner grooves are provided on the annular frame. A plurality of connecting holes and a plurality of blades are fixed on the annular groove. The inner grinding body is fixed to the support frame. The pump body is fixed to the shell. One end of the pump body is connected to the inner cavity of the outer grinding body, the inner cavity of the outer grinding body is connected to an inner groove, one inner groove is connected to the inner cavity of the middle grinding body through an annular groove and corresponding connecting holes, the middle grinding body is connected to another inner groove through corresponding connecting holes and annular grooves, the other inner groove is connected to the inner cavity of the inner grinding body, and the inner cavity of the inner grinding body is connected to the pump body.

2. A wheat flour mill according to claim 1, characterized in that: The outer wall of the outer grinding body is provided with a cylindrical surface, the inner wall of the outer grinding body is provided with a conical outer grinding surface, and the longitudinal section of the outer grinding surface is an inverted eight-shaped structure.

3. A wheat flour mill according to claim 2, characterized in that: The outer wall and the inner wall of the middle grinding body are both provided with a conical middle grinding surface, and the outer wall and the inner wall of the middle grinding body are also provided with a conical introduction surface, the two introduction surfaces are respectively located above the two middle grinding surfaces, the longitudinal sections of the two introduction surfaces are a regular eight-shaped structure, the longitudinal section of the middle grinding surface located on the outer side is an inverted eight-shaped structure, and the longitudinal section of the middle grinding surface located on the inner side is a regular eight-shaped structure.

4. A wheat flour mill according to claim 3, characterized in that: The outer wall of the inner grinding body is provided with a conical inner grinding surface, and the longitudinal section of the inner grinding surface is a regular eight-shaped structure.

5. A wheat flour mill according to claim 1, characterized in that: The annular frame is connected to the support frame via a plurality of connectors, the inner tops of the plurality of connectors are connected via an upper tube body, the inner bottoms of the plurality of connectors are connected via a lower tube body, the inner top of one of the connectors is connected to one end of the pump body via an upper conduit, and the inner bottom of one of the connectors is connected to the other end of the pump body via a lower conduit; solenoid valves are fixed on both ends of the pump body, the upper conduit and the lower conduit.

6. A wheat flour mill according to claim 5, characterized in that: The connecting piece includes a lower cylinder, a piston and a connecting rod. The lower cylinder is fixed on the support frame, the piston is slidably arranged in the lower cylinder, and the piston is fixed to the annular frame through the connecting rod. An upper chamber and a lower chamber are formed in the lower cylinder by the piston, the upper chamber is connected to the upper conduit, the lower chamber is connected to the lower conduit, and the upper chambers of multiple connecting pieces are connected through the upper tube body, and the lower chambers of multiple connecting pieces are connected through the lower tube body.

7. A wheat flour mill according to claim 6, characterized in that: A screening unit located below the grinding unit is arranged in the shell, and the screening unit includes a screen, an elastic ring, a plurality of deformation cylinders, a vibration motor and a pressure relief valve. The screen is fixed to the shell through the elastic ring, a hollow cavity is formed in the screen, a plurality of deformation cylinders are penetrated and fixed on the screen, the vibration motor is fixed to the bottom end of the screen, the inner cavity of the inner grinding body is connected with the hollow cavity, and a one-way valve is arranged at the connection point between the two, the hollow cavity is connected with the pressure relief valve, and the pressure relief valve is connected with the pump body.

8. A wheat flour mill according to claim 7, characterized in that: The deformation tube is made of silicone material, both ends of the deformation tube are open structures, and the middle part of the deformation tube is located in the hollow cavity.

9. A wheat flour mill according to claim 7, characterized in that: The screen is connected with the elastic ring as a whole, and the screen is made of stainless steel.

10. A wheat flour mill according to claim 1, characterized in that: A rolling box is fixed between the shell and the hopper, and rolling rollers are symmetrically rotated in the rolling box. Transmission gears are fixed on the two rolling rollers, and the two transmission gears are meshed. A servo motor is fixed on the rolling box, and the output shaft of the servo motor is fixed to one of the rolling rollers.

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