Rubber high speed intelligent internal mixer

Abstract

The present invention discloses a rubber high-speed intelligent internal mixer, including a machine base, an internal mixing chamber, two rotors, a driving device and a feeding and pressing device, each rotor including a transmission section rotatably arranged in the internal mixing chamber, a internal mixing section connected to the transmission section and a receiving section connected to the internal mixing section and rotatably matched with the internal mixing chamber, a discharge port is provided below the internal mixing chamber, an opening and closing assembly for opening and closing the discharge port is provided on the internal mixing chamber, the transmission section is hinged with the internal mixing section, a position limiting control assembly driving and limiting the internal mixing section and the transmission section to keep the same axis is provided on the internal mixing chamber, the internal mixing section and the transmission section keep the same axis to form a steering linkage between the two, and a positioning control assembly is provided on the receiving section to position the internal mixing section and the receiving section to keep the same axis. The present invention has the following advantages and effects: the present invention can realize the convenient separation of materials and rotors, the operation is more convenient, and the processing efficiency of the internal mixer is ensured while ensuring the processing quality of the rubber.

Description

Technical Field

[0001] The invention relates to rubber processing equipment, in particular to a rubber high-speed intelligent internal mixer. Background Art

[0002] Internal mixer is mainly used for rubber plasticizing and mixing. It is a machine with a pair of relatively rotating rotors of specific shapes, which plasticize and mix polymer materials intermittently under a closed state with adjustable temperature and pressure. It is mainly composed of a mixing chamber, rotors, feeding and pressing devices, unloading devices, transmission devices and machine base.

[0003] After the rotor rotates in the mixing chamber, the material is in a sticky and tough mass. For the part of the material that is not entangled with the rotor and adhered to the stirring ribs, it can be discharged through the discharge port; however, most of the material will still be entangled with the rotor and adhered to the gap between the stirring ribs, and it is necessary to manually pull this part of the material out from the gap between the rotor and the stirring ribs little by little. The material entangled on the rotor needs to be circumferentially peeled off during the manual removal process, and this operation is limited by the fixed rotor (that is, the rotor cannot be controlled by hand during the peeling process), the mixing chamber and the distance between the two rotors, which makes the peeling operation of this part of the material very difficult, thus greatly affecting the processing efficiency of the mixer, and unclean peeling will also affect the ratio of the next material and the processing quality. Summary of the invention

[0004] The purpose of the present invention is to provide a high-speed intelligent rubber internal mixer, which can realize convenient separation of materials and rotors, is more convenient to operate, ensures the processing efficiency of the internal mixer and ensures the processing quality of the rubber.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a rubber high-speed intelligent internal mixer, comprising a machine base, a internal mixing chamber arranged on the machine base, two rotors rotatably arranged in the internal mixing chamber, a driving device for driving the two rotors to move, and a feeding and pressing device arranged above the internal mixing chamber, each of the rotors comprising a transmission section rotatably arranged in the internal mixing chamber, a internal mixing section connected to the transmission section, and a receiving section connected to the internal mixing section and rotatably coordinated with the internal mixing chamber, a discharge port is provided below the internal mixing chamber, an opening and closing assembly for opening and closing the discharge port is provided on the internal mixing chamber, the transmission section is hinged to the internal mixing section, a limit control assembly is provided on the internal mixing chamber for driving and limiting the internal mixing section and the transmission section to remain coaxial, the internal mixing section and the transmission section remain coaxial to form a steering linkage between the two, and a positioning control assembly is provided on the receiving section for positioning the internal mixing section and the receiving section to remain coaxial.

[0006] By adopting the above technical solution, the material is put into the mixing chamber through the feeding and pressurizing device for mixing processing. When the material processing is completed, the discharge port is opened by the opening and closing component; then the restrictions on the two ends of the mixing section are released by the positioning control component and the limit control component, so that the mixing section and the materials entangled and adhered to the mixing section rotate downward toward the discharge port around the hinge under the action of gravity to a vertical state. In this way, the materials entangled and adhered to the mixing section can move downward toward the free end along the axis of the mixing section under the action of gravity and be discharged from the discharge port to realize automatic discharge. If you want to achieve fast discharge, you can manually move the entangled and adhered materials downward toward the free end of the mixing section along the axis of the mixing section. Since there is no interference from other components along the axis of the mixing section, and along the lines of the stirring ridges, the material can be quickly peeled off without causing material retention, and the operation is more convenient, ensuring the processing efficiency of the mixer while ensuring the processing quality of the rubber. After the discharge is completed, the limit control component drives the mixing section to be limited to a coaxial state with the transmission section, and then the positioning control component is used to position the mixing section and the receiving section to maintain a coaxial state. In this way, the transmission section can drive the mixing section to achieve stable rotation in the mixing chamber, and finally the discharge port is closed by the opening and closing component to wait for the next processing.

[0007] It is further configured as follows: the kneading section includes a core shaft hinged to the transmission section and an outer cylinder slidably mounted on the core shaft and having stirring ridges; when the positioning control component positions the core shaft and the receiving section to remain coaxial, the core shaft and the receiving section form a steering linkage; the positioning control component rotates with the receiving section; when the positioning control component is in a positioned state, a linkage component is provided between the positioning control component and the outer cylinder to limit the movement of the axis of the outer cylinder and form a steering linkage.

[0008] By adopting the above technical solution, when the positioning control component positions the mixing section and the receiving section to maintain a coaxial state, the core shaft and the receiving section form a steering linkage, so that the transmission section can drive the receiving section to rotate through the core shaft. The rotating receiving section drives the outer cylinder to rotate through the cooperation of the positioning control component and the linkage component, so as to ensure the normal rotation of the mixing section to perform mixing operations. When the positioning control component and the limit control component release the restrictions on the two ends of the mixing section, when the core shaft rotates around the hinge to a vertical state, the outer cylinder slidably sleeved on the core shaft can achieve rapid material discharge and separation along with the materials wrapped and adhered to the outer cylinder, and then the worker only needs to take out the outer cylinder from the material and reinstall it on the core shaft. This setting structure not only realizes the rapid discharge of materials, but also the way of taking out the outer cylinder from the material and separating it from the material is more convenient to operate, there are no limiting factors during the operation, and there will be no unclean material stripping phenomenon. This setting method can also replace the outer cylinder with different shapes of stirring ridges according to the different types of stirring materials and different processing requirements, which can adapt to the different processing of different materials and has better practicality and versatility. And by installing outer cylinders of different thicknesses, the distance between the two rotors can be changed, and different extrusion and shear forces can be applied to the materials, thereby processing materials of different qualities.

[0009] It is further configured as follows: it includes a linkage groove arranged at one end of the receiving section facing the mixing section and a linkage block fixedly arranged at one end of the core shaft facing the receiving section and rotating into the linkage groove with the core shaft, the positioning control component includes a positioning sleeve that reciprocates along the axis of the receiving section and rotates with the receiving section, and a driving screw threadedly connected to the receiving section to drive the positioning sleeve to move, and the positioning sleeve is simultaneously sleeved on the core shaft and the receiving section to position the two in a coaxial state.

[0010] By adopting the above technical solution, the linkage block rotates into the linkage groove along with the mandrel, and the steering linkage between the mandrel and the receiving section is formed by the cooperation between the linkage block and the linkage groove. The driving screw rotates to drive the positioning sleeve to move toward the mandrel, and when the positioning sleeve is simultaneously sleeved on the mandrel and the receiving section, the two are positioned in a coaxial state.

[0011] It is further configured as follows: the linkage assembly includes a first face gear fixedly arranged on an end surface of the positioning sleeve facing the mixing section, and a second face gear fixedly arranged on an end surface of the outer cylinder facing the receiving section and meshing with the first face gear.

[0012] By adopting the above technical solution, the positioning sleeve drives the first face gear to move toward the second face gear. When the two are engaged, a steering linkage is formed between the positioning control component and the outer cylinder, so that the outer cylinder can play a role in kneading the material.

[0013] It is further configured as follows: an outer wall of the core shaft is provided with an installation groove, and a plurality of the installation grooves are distributed around the center of the core shaft, a positioning column is movably provided in each of the installation grooves, and the installation groove limits the detachment of the positioning column, and each of the installation grooves is provided with a clamping spring for driving the positioning column to move toward the opening of the installation groove, and the positioning column protrudes from the position of the opening of the installation groove to form a spherical clamping portion, and when the outer cylinder is sleeved on the core shaft, the clamping portion limits the outer cylinder from detaching from the core shaft, and a toggle assembly is provided on the side below the mixing chamber.

[0014] By adopting the above technical solution, when the mixing section rotates to a vertical state, the outer cylinder is limited to be separated from the core shaft by the action of the abutting part. At this time, the material on the outer cylinder is applied with a toggle force by the toggle assembly. The force is greater than the limiting force of the abutting part, so that the positioning column retracts inward, and the outer cylinder and the core shaft can be separated. When the outer cylinder is put back on the core shaft, a larger force is applied to the outer cylinder to retract the positioning column, so that the outer cylinder can be fixed to the core shaft, and the lower end of the outer cylinder is limited to be separated from the core shaft by the limiting position of the abutting part, so as to realize the convenient installation of the outer cylinder on the core shaft, and the operation is more convenient.

[0015] The toggle assembly is further configured as follows: the toggle assembly includes a mounting frame, a lifting seat slidably arranged on the mounting frame, a lifting screw rotatably arranged on the mounting frame and threadedly connected to the lifting seat, a motor driving the lifting screw to rotate, a first cylinder fixedly arranged on the lifting seat, and a toggle rod driven by the first cylinder to reciprocate toward one side of the discharge port.

[0016] By adopting the above technical solution, the first cylinder drives the lever to be inserted into the material, and then the lifting seat lowers the height of the lever to apply a downward force to the material, thereby realizing the discharge of the material, and the outer cylinder is separated from the core shaft under the action of the material.

[0017] It is further configured as follows: the limit control component includes a limit sleeve slidably mounted on the transmission section, a driving cylinder driving the limit sleeve to reciprocate, and a tightening protrusion formed on one end surface of the limit sleeve facing the mixing section, the driving cylinder drives the tightening protrusion to press against the mixing section and reset it to a coaxial setting with the transmission section and is maintained in a coaxial state by the limit sleeve.

[0018] By adopting the above technical solution, after the mixing section rotates around the hinge to a vertical state, the driving cylinder drives the limiting sleeve to drive the clamping protrusion to move toward one side of the mixing section. The clamping protrusion first contacts the mixing section and applies a driving force to it, so that the mixing section rotates around the hinge and resets to a coaxial state with the transmission section. Then, the limiting sleeve is put on the transmission section and the mixing section to limit the two and keep them in a coaxial state.

[0019] It is further configured that: the inner cavity of the mixing chamber is provided with a ring-shaped air inlet pipe sleeved on the rotor at a position close to the rotor and the mixing chamber for rotational cooperation, the air inlet pipe is provided with an air outlet, and a plurality of air outlet holes are distributed around the air inlet pipe.

[0020] By adopting the above technical solution, when powdered materials are added to the mixing chamber, air is blown out through the surrounding air outlet holes to form an air barrier at the periphery of the rotational matching position of the rotor and the mixing chamber, so that the powdered materials will not enter the rotational matching gap between the rotor and the mixing chamber, thereby avoiding rotation jamming at this position, thereby extending the service life of the mixer without wasting a large amount of sealant and subsequent maintenance.

[0021] It is further configured as follows: the opening and closing assembly includes an opening and closing door hinged to the mixing chamber and a locking bolt connecting the opening and closing door and the mixing chamber.

[0022] By adopting the above technical solution, the locking bolt is used to fix the position of the opening and closing door, thereby realizing the opening and closing of the opening and closing door.

[0023] In summary, the present invention has the following beneficial effects: the present invention can realize the convenient separation of the material and the rotor, the operation is more convenient, and the processing efficiency of the internal mixer is ensured while ensuring the processing quality of the rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment;

[0025] Figure 2 It is a structural schematic diagram of the toggle assembly in the embodiment;

[0026] Figure 3 It is a structural schematic diagram of the opening and closing component in the embodiment;

[0027] Figure 4 A partial cross-sectional view of an embodiment;

[0028] Figure 5 is a schematic structural diagram of a rotor in an embodiment;

[0029] Figure 6 A partial exploded view of a positioning control component in an embodiment;

[0030] Figure 7 is a cross-sectional view of a rotor in an embodiment;

[0031] Figure 8 for Figure 7 Enlarged view of part A in the middle.

[0032] In the figure: 1, machine base; 2, mixing chamber; 3, rotor; 31, transmission section; 32, mixing section; 321, mandrel; 322, outer cylinder; 33, receiving section; 4, driving device; 5, feeding and pressing device; 6, discharge port; 7, opening and closing assembly; 71, opening and closing door; 72, locking bolt; 8, limit control assembly; 81, limit sleeve; 82, driving cylinder; 83, pressing convex block; 9, positioning control assembly; 91, positioning sleeve; 9 2. Driving screw; 10. Linkage assembly; 101. First face gear; 102. Second face gear; 11. Linkage groove; 12. Linkage block; 13. Mounting groove; 14. Positioning column; 15. Clamping spring; 16. Clamping part; 17. Toggle assembly; 171. Mounting frame; 172. Lifting seat; 173. Lifting screw; 174. Motor; 175. First cylinder; 176. Toggle rod; 18. Inlet pipe; 19. Exhaust hole. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] refer to Figures 1 to 8 A rubber high-speed intelligent internal mixer comprises a machine base 1, an internal mixing chamber 2 mounted on the machine base 1, two rotors 3 rotatably arranged in the internal mixing chamber 2, a driving device 4 driving the two rotors 3 to rotate, and a feeding and pressing device 5 arranged above the internal mixing chamber 2. The driving device 4 comprises a motor fixedly arranged on the machine base 1 and gears respectively fixedly arranged on the two rotors 3 and meshing with each other, and the output shaft of the motor is fixedly connected to one of the rotors 3. The feeding and pressing device 5 comprises a cylinder fixedly arranged on the machine base 1 and a pressure block fixedly arranged on the piston rod of the cylinder and slidingly matched with the entrance of the internal mixing chamber 2. Each rotor 3 comprises a transmission section 31 rotatably arranged in the internal mixing chamber 2, a internal mixing section 32 connected to the transmission section 31, and a receiving section 33 connected to the internal mixing section 32 and rotatably matched with the internal mixing chamber 2. A discharge port 6 is provided below the mixing chamber 2, and an opening and closing assembly 7 for opening and closing the discharge port 6 is provided on the mixing chamber 2. The transmission section 31 is hinged with the mixing section 32, and a position limiting control assembly 8 is provided on the mixing chamber 2 to drive and limit the mixing section 32 and the transmission section 31 to keep them coaxial. The mixing section 32 and the transmission section 31 are kept coaxial to form a steering linkage between the two. A positioning control assembly 9 is provided on the receiving section 33 to position the mixing section 32 and the receiving section 33 to keep them coaxial.

[0035] The mixing section 32 includes a core shaft 321 hinged to the transmission section 31 and an outer cylinder 322 slidably mounted on the core shaft 321 and having stirring ridges. When the positioning control assembly 9 positions the core shaft 321 and the receiving section 33 to keep them coaxial, the core shaft 321 and the receiving section 33 form a steering linkage; the positioning control assembly 9 rotates with the receiving section 33. When the positioning control assembly 9 is in a positioning state, a linkage assembly 10 is provided between the positioning control assembly 9 and the outer cylinder 322 to limit the axial movement of the outer cylinder 322 and form a steering linkage. The receiving section 33 is provided with a linkage groove 11 at one end facing the mixing section 32, and a linkage block 12 is integrally provided at one end of the core shaft 321 facing the receiving section 33, which rotates into the linkage groove 11 along with the core shaft 321. The steering linkage between the core shaft 321 and the receiving section 33 is formed by the cooperation between the linkage groove 11 and the linkage block 12. The positioning control assembly 9 includes a positioning sleeve 91 that reciprocates along the axis of the receiving section 33 and rotates with the receiving section 33, and a driving screw 92 that is disposed in the receiving section 33 and threadedly connected thereto to drive the positioning sleeve 91 to move, and one end of the driving screw 92 is rotatably connected to the positioning sleeve 91. The positioning sleeve 91 is simultaneously sleeved on the core shaft 321 and the receiving section 33 to position the two in a coaxial state.

[0036] The linkage assembly 10 includes a first face gear 101 fixedly arranged on an end face of the positioning sleeve 91 facing the core shaft 321, and a second face gear 102 fixedly arranged on an end face of the outer cylinder 322 facing the receiving section 33 and meshing with the first face gear 101. The outer peripheral wall of the core shaft 321 is provided with a mounting groove 13, and a plurality of mounting grooves 13 are arranged around the center of the core shaft 321. A positioning column 14 is movably arranged in each mounting groove 13, and the mounting groove 13 restricts the positioning column 14 from being disengaged. A tightening spring 15 is arranged in each mounting groove 13 to drive the positioning column 14 to move toward the opening of the mounting groove 13. The positioning column 14 protrudes from the position of the opening of the mounting groove 13 to form a spherical tightening portion 16. When the outer cylinder 322 is sleeved on the core shaft 321, the tightening portion 16 restricts the outer cylinder 322 from being disengaged from the core shaft 321. A toggle assembly 17 is arranged on the side below the mixing chamber 2. The shifting assembly 17 includes a mounting frame 171 fixedly mounted on the machine base 1, a lifting seat 172 slidably mounted on the mounting frame 171, a lifting screw 173 rotatably mounted on the mounting frame 171 and threadedly connected to the lifting seat 172, a motor 174 driving the lifting screw 173 to rotate, a first cylinder 175 fixedly mounted on the lifting seat 172, and a shifting rod 176 driven by the first cylinder 175 to reciprocate toward the side of the discharge port 6. The shifting rod 176 is fixedly mounted on the piston rod of the first cylinder 175, the motor 174 is fixedly mounted on the mounting frame 171, and the output shaft is fixedly connected to the lifting screw 173.

[0037] The limit control assembly 8 includes a limit sleeve 81 slidably sleeved on the transmission section 31, a driving cylinder 82 driving the limit sleeve 81 to reciprocate, and a tight projection 83 formed on one end face of the limit sleeve 81 facing the core shaft 321. The driving cylinder 82 drives the tight projection 83 to press against the core shaft 321 to reset to be coaxially arranged with the transmission section 31 and the limit sleeve 81 is used to limit and keep the two in a coaxial state. The cylinder body of the driving cylinder 82 is fixedly arranged in the mixing chamber 2, and the piston rod is fixedly connected to the limit sleeve 81. The inner cavity of the mixing chamber 2 is close to the position where the rotor 3 rotates with the mixing chamber 2. The ring-shaped air inlet pipe 18 sleeved on the rotor 3 is provided, and the air inlet pipe 18 is provided with an air outlet 19, and a plurality of air outlets 19 are arranged around the center of the air inlet pipe 18. The air inlet pipe 18 is fixedly arranged on the inner wall of the mixing chamber 2 and the material is a metal pipe. The opening and closing assembly 7 includes an opening and closing door 71 hinged to the mixing chamber 2 and a locking bolt 72 connecting the opening and closing door 71 and the mixing chamber 2 . The locking bolt 72 passes through the mixing chamber 2 and is threadedly connected to the opening and closing door 71 .

[0038] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high-speed intelligent rubber mixer, comprising a machine base (1), a mixing chamber (2) arranged on the machine base (1), two rotors (3) rotatably arranged in the mixing chamber (2), a driving device (4) for driving the two rotors (3) to move, and a feeding and pressing device (5) arranged above the mixing chamber (2), characterized in that: Each of the rotors (3) comprises a transmission section (31) rotatably arranged in the mixing chamber (2), a mixing section (32) connected to the transmission section (31), and a receiving section (33) connected to the mixing section (32) and rotatably matched with the mixing chamber (2); a discharge port (6) is provided below the mixing chamber (2); an opening and closing assembly (7) for opening and closing the discharge port (6) is provided on the mixing chamber (2); the transmission section (31) is hingedly connected to the mixing section (32); a limit control assembly (8) for driving and limiting the mixing section (32) and the transmission section (31) to remain coaxial is provided on the mixing chamber (2); the mixing section (32) and the transmission section (31) remain coaxial to form a steering linkage between the two; and a positioning control assembly (9) for positioning the mixing section (32) and the receiving section (33) to remain coaxial is provided on the receiving section (33).

2. The rubber high-speed intelligent internal mixer according to claim 1, characterized in that: The mixing section (32) comprises a core shaft (321) hinged to the transmission section (31) and an outer cylinder (322) slidably mounted on the core shaft (321) and having stirring ridges. When the positioning control component (9) positions the core shaft (321) and the receiving section (33) to remain coaxial, the core shaft (321) and the receiving section (33) form a steering linkage. The positioning control component (9) rotates with the receiving section (33). When the positioning control component (9) is in a positioning state, a linkage component (10) is provided between the positioning control component (9) and the outer cylinder (322) for limiting the axial movement of the outer cylinder (322) and forming a steering linkage.

3. The rubber high-speed intelligent internal mixer according to claim 2, characterized in that: The invention comprises a linkage groove (11) arranged at one end of the receiving section (33) facing the mixing section (32), and a linkage block (12) fixedly arranged at one end of the core shaft (321) facing the receiving section (33) and rotating into the linkage groove (11) along with the core shaft (321); the positioning control component (9) comprises a positioning sleeve (91) which reciprocates along the axis of the receiving section (33) and rotates along with the receiving section (33), and a driving screw (92) which is threadedly connected to the receiving section (33) to drive the positioning sleeve (91) to move; the positioning sleeve (91) is simultaneously sleeved on the core shaft (321) and the receiving section (33) to position the two in a coaxial state.

4. The rubber high-speed intelligent internal mixer according to claim 3, characterized in that: The linkage assembly (10) comprises a first face gear (101) fixedly arranged on an end surface of the positioning sleeve (91) facing the mixing section (32), and a second face gear (102) fixedly arranged on an end surface of the outer cylinder (322) facing the receiving section (33) and meshing with the first face gear (101).

5. The rubber high-speed intelligent internal mixer according to claim 2, characterized in that: The outer peripheral wall of the core shaft (321) is provided with a mounting groove (13), and a plurality of the mounting grooves (13) are arranged around the center of the core shaft (321). A positioning column (14) is movably arranged in each of the mounting grooves (13), and the mounting groove (13) limits the detachment of the positioning column (14). A clamping spring (15) is arranged in each of the mounting grooves (13) for driving the positioning column (14) to move toward the opening of the mounting groove (13). The positioning column (14) protrudes from the position of the opening of the mounting groove (13) to form a spherical clamping portion (16). When the outer cylinder (322) is mounted on the core shaft (321), the clamping portion (16) limits the detachment of the outer cylinder (322) from the core shaft (321). A toggle assembly (17) is arranged on one side below the mixing chamber (2).

6. The rubber high-speed intelligent internal mixer according to claim 5, characterized in that: The shifting assembly (17) comprises a mounting frame (171), a lifting seat (172) slidably disposed on the mounting frame (171), a lifting screw (173) rotatably disposed on the mounting frame (171) and threadedly connected to the lifting seat (172), a motor (174) for driving the lifting screw (173) to rotate, a first cylinder (175) fixedly disposed on the lifting seat (172), and a shifting rod (176) driven by the first cylinder (175) to reciprocate toward one side of the discharge port (6).

7. The rubber high-speed intelligent internal mixer according to claim 1, characterized in that: The limit control assembly (8) comprises a limit sleeve (81) slidably sleeved on the transmission section (31), a driving cylinder (82) driving the limit sleeve (81) to reciprocate, and a pressing protrusion (83) formed on an end surface of the limit sleeve (81) facing the mixing section (32), wherein the driving cylinder (82) drives the pressing protrusion (83) to press against the mixing section (32) to reset to a coaxial arrangement with the transmission section (31) and to be kept in a coaxial state by the limit sleeve (81).

8. The rubber high-speed intelligent internal mixer according to claim 1, characterized in that: An annular air inlet pipe (18) sleeved on the rotor (3) is provided in the inner cavity of the mixing chamber (2) near the position where the rotor (3) rotates with the mixing chamber (2). The air inlet pipe (18) is provided with an air outlet hole (19). A plurality of air outlet holes (19) are distributed around the air inlet pipe (18).

9. The rubber high-speed intelligent internal mixer according to claim 1, characterized in that: The opening and closing assembly (7) comprises an opening and closing door (71) hinged to the mixing chamber (2) and a locking bolt (72) connecting the opening and closing door (71) and the mixing chamber (2).

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