Mixing machine

Abstract

The invention provides a mixer, and belongs to the technical field of mixing equipment. The powder mixing device solves the problem that an existing powder mixing device is poor in mixing effect. The mixer comprises a rotating shaft, a barrel-shaped barrel body and a barrel cover which is connected to the top of the barrel body in an openable and closable mode, a through hole is formed in the bottom of the barrel body in the vertical direction in a penetrating mode, the rotating shaft is vertically arranged and penetrates through the through hole, stirring blades are fixed to the rotating shaft in the circumferential direction, a tubular air inlet pipe is connected to the bottom of the barrel body, and the barrel cover is connected to the top of the barrel body in an openable and closable mode. The lower end of the rotating shaft penetrates through the air inlet pipe, an air inlet gap communicated with the air inlet pipe is formed between the outer side of the rotating shaft and the hole wall of the through hole, the end, away from the rotating shaft, of the stirring blade is provided with a stirring part bent upwards, and a plurality of air blowing openings are formed in the side portion of the barrel body in the radial direction in a penetrating mode. And the plurality of air blowing ports are circumferentially distributed around the rotating shaft. The mixer has the advantage of good mixing effect.

Description

Technical Field

[0001] This invention belongs to the technical field of mixing equipment and relates to a mixing machine. Background Technology

[0002] Polytetrafluoroethylene (PTFE), commonly known as "the king of plastics," is a high-molecular polymer synthesized from tetrafluoroethylene monomers. It is white, waxy, and translucent, possessing excellent heat resistance, cold resistance, and acid and alkali resistance. The production of PTFE requires a combination of various raw materials and the mixing of powders of different colors to create a new color. This necessitates the use of mixing equipment to blend the various powdered raw materials.

[0003] For example, a powder mixing device has been designed and a Chinese patent has been applied for, with application number 202020762804.6 and publication number CN212576092U. The powder mixing device includes: a mixing tank with a stirring device; a discharge cylinder for powder discharge is fixedly installed at the bottom of the side wall of the mixing tank; the inner cavity of the discharge cylinder is connected to the inner cavity of the mixing tank; the outer port of the discharge cylinder is the discharge port of the mixing tank; a fixed box with four sides closed is fixedly covered at the outer end of the discharge cylinder; the discharge port of the discharge cylinder extends into the inner cavity of the fixed box; a powder outlet is provided on the lower side wall of the fixed box; the powder outlet is located below the discharge port; a discharge port end cap that can be closed on the discharge port is provided in the inner cavity of the fixed box; and a driving mechanism that can drive the discharge port end cap to move closer to and away from the discharge port is also provided on the fixed box. When the powder mixing device is working, the stirring device mixes and stirs the powder in the mixing tank, and after the stirring is completed, it is sent out from the powder outlet.

[0004] However, when the powder mixing device described above is mixing powder, the powder tends to settle at the bottom of the mixing tank. When the stirring device is agitated, only a portion of the powder will be stirred and mixed, resulting in uneven mixing and poor mixing effect. In addition, the polytetrafluoroethylene raw material is very prone to clumping during the mixing process, which will affect the quality of the mixed powder. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a mixing machine that solves the problem of poor mixing effect in existing powder mixing devices.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A mixing machine includes a rotating shaft, a cylindrical barrel body, and a barrel cover that is openable and closable connected to the top of the barrel body. A through hole is vertically opened at the bottom of the barrel body. The rotating shaft is vertically positioned and passes through the through hole. A stirring blade is circumferentially fixed on the rotating shaft. The machine is characterized in that a tubular air inlet pipe is connected to the bottom of the barrel body, the lower end of the rotating shaft passes through the air inlet pipe, and an air inlet gap communicating with the air inlet pipe is formed between the outer side of the rotating shaft and the wall of the through hole. The stirring blade has an upwardly bent stirring section at its end away from the rotating shaft. Several air outlets are radially opened on the side of the barrel body, and these air outlets are circumferentially distributed around the rotating shaft.

[0008] When using the mixer, open the lid, put the raw materials into the container, and then close the lid again. The motor and other drive components drive the rotating shaft to rotate circumferentially, which in turn drives the mixing blades to rotate rapidly circumferentially to mix the powder. At the same time, air is blown towards the container through the air gap on the outside of the rotating shaft through the air inlet pipe, and negative ions generated by the negative ion generator are blown into the container through the air outlet.

[0009] During this operation, because the shaft needs to rotate circumferentially, gaps easily appear between it and the wall of the through hole. Mixed powder can easily enter these gaps and affect the rotation of the shaft. This gap is used as an air inlet gap. An air inlet pipe is connected to this gap and blows air towards the barrel. When the sealing effect at the through hole is good, pressure is maintained. When the sealing effect at the through hole is poor and powder enters the air inlet gap, the powder mixed in between the shaft and the wall of the through hole can be blown away, thus preventing the powder from affecting the rotation of the shaft and ensuring smooth and stable rotation of the shaft. This, in turn, ensures the stability and uniformity of the mixing of powder by the stirring blade. At the same time, the upward-bending stirring part allows the powder moving outward during the mixing process to move along the bending direction of the stirring part without directly detaching from the stirring blade. This prevents all the powder from scattering to the edge of the barrel and depositing at the bottom of the barrel, making the powder mix more uniform. The negative ions introduced through several air outlets can reduce the static electricity of the powder and prevent the powder from clumping together, which would affect the powder mixing effect.

[0010] In the aforementioned mixer, the number of air nozzles is even, and they are arranged in pairs facing each other. The radially opened air nozzles, arranged in pairs facing each other, can enhance the collision of airflow, disperse agglomerated powder, and improve the mixing effect.

[0011] In the aforementioned mixer, several air inlets are provided through the barrel lid. In addition to the side wall of the barrel, air inlets for introducing negative ions are also provided through the barrel lid, further enhancing the airflow collision, dispersing clumps of powder, and improving the mixing effect.

[0012] In the aforementioned mixer, the inner wall of the barrel has protruding guide blocks, and the sides of the guide blocks have concave, arc-shaped guide surfaces. Driven by the circumferentially rotating shaft and stirring blades, some powder moves circumferentially along the inner wall of the barrel. The arc-shaped guide surfaces on the protruding guide blocks guide the powder, causing it to detach from the inner wall of the barrel and move, thus allowing the powder to participate in mixing better and increasing powder impact, preventing powder agglomeration.

[0013] In one of the above-mentioned mixing machines, the bottom side of the barrel has a discharge section and a feeding device that communicate with the interior of the barrel. The bottom of the discharge section has a feeding port, and the feeding device can connect or block the feeding port from the interior of the barrel. A loosening machine that can break up the powder mixture is provided below the feeding port. The loosening machine can further break up the powder mixture and prevent the delivered powder from clumping.

[0014] In one of the aforementioned mixers, the barrel and / or discharge section has several air inlets for blowing air into the connection between the barrel and the discharge section. Similarly, the discharge component seals the connection between the barrel and the discharge section, but gaps may exist in the seal. The air inlets can maintain pressure at the sealed area, and when gaps exist, air is blown inward, allowing the powder to be better mixed within the barrel.

[0015] In the aforementioned mixing machine, the outlet of the loosening machine is located at the bottom, and a receiving hopper is provided on the lower side of the loosening machine. A lifting drive unit is connected to the bottom of the receiving hopper, capable of driving the receiving hopper to rise and fall. The rising and falling of the receiving hopper can increase or decrease the distance between it and the outlet of the loosening machine, allowing the powder to be distributed more evenly after being discharged. Simultaneously, the movement and vibration generated during the lifting process also contribute to a more uniform distribution of the powder within the receiving hopper.

[0016] In the aforementioned mixing machine, a dust collection port is provided through the top of the bucket lid. A filter element is connected to the upper side of the dust collection port on the bucket lid. The filter element is connected to an airflow cyclone separator and a dust collection box via pipes. The filter element and dust collection box collect some of the airborne powder, preventing powder from escaping and polluting the environment when the bucket lid is opened.

[0017] In the aforementioned mixing machine, a dust collection hood for sucking up powder is also provided above the barrel. The bottom of the dust collection hood has an inlet that covers the entire top of the barrel, and the top of the dust collection hood has an outlet that is connected to the aforementioned dust collection box via a pipe. By sucking up the dust emitted from above the barrel through the dust collection hood, a good working environment is further ensured.

[0018] In the aforementioned mixing machine, the air inlet pipe is vertically arranged and fixed to the bottom surface of the barrel, and the side of the air inlet pipe has an air inlet.

[0019] Compared with existing technologies, this mixer blows air into the barrel through the air inlet pipe during use. This blows away the powder mixed in between the rotating shaft and the barrel, preventing the powder from affecting the rotation of the shaft and ensuring smooth and stable rotation. This, in turn, ensures the stability and uniformity of the mixing of powder by the mixing blades. At the same time, the upward bending of the mixing part prevents all the powder from scattering to the edge of the barrel and depositing at the bottom, making the powder mix more even. The negative ions introduced through several air outlets can reduce the static electricity of the powder and prevent the powder from clumping together, which would affect the powder mixing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this mixing machine.

[0021] Figure 2 This is a structural diagram of the barrel body.

[0022] In the diagram, 1. Barrel body; 2. Barrel lid; 3. Rotating shaft; 4. Stirring blade; 5. Air inlet pipe; 6. Air inlet gap; 7. Stirring section; 8. Air outlet; 9. Guide block; 10. Discharge section; 11. Discharge component; 12. Discharge port; 13. Loosening machine; 14. Collection bin; 15. Lifting drive component; 16. Filter element; 17. Airflow cyclone separator; 18. Dust collection box; 19. Dust collection hood; 20. Guide surface; 21. Through hole. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, this mixer includes a cylindrical barrel 1, a barrel cover 2 connected to the top of the barrel 1, and an opening / closing cylinder capable of driving the barrel cover 2 to open or close. A rotating shaft 3 is vertically inserted through the bottom of the barrel 1, and the lower end of the rotating shaft 3 extends out from the bottom of the barrel 1 and is connected to a stirring motor via a pulley and a belt. Stirring blades 4 are fixed on the rotating shaft 3 inside the barrel 1, and the stirring blades 4 are symmetrically fixed on the rotating shaft 3. In this embodiment, both ends of the stirring blades 4 have upwardly bent stirring sections 7.

[0025] A through hole 21 is vertically opened at the bottom of the barrel 1. A tubular air inlet pipe 5 is connected to the lower side of the barrel 1, and the air inlet pipe 5 is positioned opposite to the through hole 21. The lower end of the rotating shaft 3 passes through the air inlet pipe 5, and there is an air intake gap 6 between the outer side of the rotating shaft 3 and the wall of the through hole 21 of the barrel 1, which is connected to the air inlet pipe 5. In this embodiment, the air inlet pipe 5 is vertically arranged, and the upper end of the air inlet pipe 5 is fixed to the bottom surface of the barrel 1. The outer side of the lower end of the rotating shaft 3 and the air inlet pipe 5 are sealed by sealing elements such as sealing rings. The side of the air inlet pipe 5 has an air inlet, which is located between the aforementioned seal and the air intake gap 6. The air inlet is connected to an air source through a pipe, and the air supply can be controlled by a solenoid valve. A sealing element that can seal the space between the rotating shaft 3 and the wall of the through hole 21 is fixed on the lower side of the stirring blade 4.

[0026] Several air inlets 8 are radially penetrating the side of the barrel body 1, and these air inlets 8 are distributed circumferentially around the rotating axis 3; similarly, several air inlets 8 are penetrating the barrel lid 2. In this embodiment, the number of air inlets 8 on the side of the barrel body 1 is even, and they are arranged in pairs opposite each other. The outer end of the air inlets 8 is connected to a negative ion generator for introducing negative ions into the barrel body 1. The height of the air inlets 8 corresponds to the height of the stirring blades 4, preferably, to the height of the highest stirring blades 4; the air inlets 8 on the barrel lid 2 are vertically penetrating around the center of the barrel lid 2.

[0027] The inner wall of the barrel 1 has a protruding guide block 9, which is elongated, vertically arranged, and integrally connected to the inner wall of the barrel 1. The side of the guide block 9 used for powder impact has a guide surface 20 that guides the powder towards the axis of the stirring blade 4 or the rotating shaft 3; this guide surface 20 is an arc surface. In this embodiment, there is one guide block 9; however, it can be arranged in sections or circumferentially as needed or depending on the usage environment.

[0028] The bottom side of the barrel 1 has a discharge section 10 and a discharge component 11 that are connected to the inside of the barrel 1. The discharge section 10 has a feed inlet on the side near the barrel 1 and a discharge port 12 at the bottom of the discharge section 10. The discharge component 11 includes a horizontally arranged push rod, a discharge cylinder, and a vertically arranged push plate. The discharge cylinder is located on the outside of the discharge section 10. The push rod is horizontally inserted into the discharge section 10 and fixed to the push plate. The discharge cylinder can drive the push rod to push the push plate to move towards the feed inlet and block the feed inlet, thereby controlling the discharge. The barrel and / or the discharge section have several air inlets for blowing air towards the feed inlet. These air inlets can be connected to the air inlet of the air inlet pipe 5 to the same air source.

[0029] A loosening machine 13 capable of breaking up powder mixtures is provided below the discharge port 12. The outlet of the loosening machine 13 is located at the bottom. A receiving hopper 14 with a receiving port at the top is provided below the loosening machine 13. A lifting drive component 15 capable of driving the receiving hopper 14 to rise and fall is connected to the bottom of the receiving hopper 14. In this embodiment, the lifting drive component 15 is a lifting cylinder, and at least two are provided.

[0030] A dust collection port is vertically vented through the top of the lid 2. A filter element 16 is connected to the upper side of the dust collection port of the lid 2. The filter element 16 is connected to the airflow cyclone separator 17 and the dust collection box 18 in sequence through pipes. The filter element 16 and the airflow cyclone separator 17 are existing structures. The dust collection box 18 includes a negative pressure fan, a dust collection pulse cleaning valve, an air tank, a dust collection filter element, a dust collection chamber, and a recovery chamber arranged in sequence from top to bottom. A pressure gauge is connected to one side of the air tank.

[0031] Dust enters the dust collection chamber through the airflow cyclone separator 17. After being filtered by the dust collection filter element, the powder falls into the dust collection chamber and then enters the recycling chamber for recovery.

[0032] A dust collection hood 19 for sucking up powder is also provided above the barrel body 1. The bottom of the dust collection hood 19 has an inlet that covers the entire top of the barrel body 1, and the top of the dust collection hood 19 has an outlet that is connected to the negative pressure fan of the aforementioned dust collection box 18 via a pipe. Air and powder can be sucked into the dust collection box 18 by the negative pressure fan, and a switching valve is connected at the connection between the pipe at the dust collection hood 19 and the pipe at the filter element 16.

[0033] When using this mixer, open the lid 2, put the raw materials into the barrel 1, and then close the lid 2 again. The stirring motor drives the rotating shaft 3 to rotate circumferentially, which in turn drives the stirring blades 4 to rotate rapidly circumferentially to mix the powder. At the same time, air is blown into the barrel 1 through the air inlet pipe 5 along the air gap on the outside of the rotating shaft 3, and negative ions generated by the negative ion generator are blown into the barrel 1 through the air outlet 8.

[0034] During the initial use of the mixer, the seal on the underside of the mixing blade 4 seals the space between the rotating shaft 3 and the through hole 21, preventing powder from entering the air inlet gap. The air inlet pipe 5 blows air into the barrel 1 to maintain pressure at the air inlet gap 6. After prolonged use, if the seal fails due to wear or aging, powder may enter the air inlet gap 6. Blowing air into the barrel 1 through the air inlet pipe 5 can blow away the powder mixed in the gap between the rotating shaft 3 and the barrel 1, preventing the powder from affecting the rotation of the rotating shaft 3 and ensuring its smooth and stable rotation. This, in turn, ensures the stability and uniformity of the powder mixing by the mixing blade 4. Simultaneously, the upward-bent mixing part 7 lifts the powder upwards, preventing it from all settling at the bottom of the barrel 1, resulting in more uniform powder mixing. Furthermore, the negative ions introduced through several air outlets 8 reduce static electricity in the powder, preventing powder clumping and ensuring effective mixing.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A mixer comprising a rotating shaft (3), a barrel (1) in the shape of a barrel, and a barrel cover (2) which is connected to the top of the barrel (1) in a releasable manner, a through hole (21) being formed through the bottom of the barrel (1) in the vertical direction, the rotating shaft (3) being arranged vertically and passing through the through hole (21), and a stirring blade (4) being fixed to the rotating shaft (3) in the circumferential direction, characterized in that, The bottom of the barrel body (1) is connected with a tubular air inlet pipe (5), the lower end of the rotating shaft (3) penetrates the air inlet pipe (5), the outer side of the rotating shaft (3) and the hole wall of the through hole (21) have an air inlet gap (6) in communication with the air inlet pipe (5), the end of the stirring blade (4) away from the rotating shaft is provided with an upwardly bent stirring part (7), the side of the barrel body (1) is provided with a plurality of air blowing openings (8) penetrating in the radial direction, and the air blowing openings (8) are distributed in the circumferential direction around the axis of the rotating shaft (3).

2. A mixer as claimed in claim 1, characterised in that The number of the air blowing openings (8) is even and the air blowing openings (8) are arranged in pairs.

3. A mixer according to claim 1 or 2, characterised in that, The barrel cover (2) is provided with a plurality of the air blowing openings (8) penetratingly arranged thereon.

4. A mixer according to claim 1 or 2, characterised in that The inner wall of the barrel body (1) is provided with a protruding flow guide block (9), and the side of the flow guide block (9) is provided with a concave arc-shaped guide surface (20).

5. A mixer according to claim 1 or 2, characterised in that One side of the bottom of the barrel body (1) is provided with a discharging part (10) in communication with the inside of the barrel body (1) and a discharging element (11), the bottom of the discharging part (10) is provided with a discharging opening (12), the discharging element (11) can make the discharging opening (12) and the inside of the barrel body (1) communicate or be blocked, and the lower side of the discharging opening (12) is provided with a loosening machine (13) capable of dispersing powder mixture.

6. A mixer as claimed in claim 5, characterised in that The barrel body (1) and / or the discharging part (10) are provided with a plurality of air inlet holes for blowing air to the communication part of the barrel body (1) and the discharging part (10).

7. A mixer as claimed in claim 5, wherein The outlet of the loosening machine (13) is located at the bottom, and the lower side of the loosening machine (13) is provided with a collecting barrel (14), and the bottom of the collecting barrel (14) is connected with a lifting driving element (15) capable of driving the collecting barrel (14) to lift.

8. A mixer according to claim 1 or 2, characterised in that The top of the barrel cover (2) is provided with a dust collecting opening penetratingly arranged thereon, the upper side of the dust collecting opening of the barrel cover (2) is connected with a filter element device (16), and the filter element device (16) is sequentially connected to the air flow cyclone (17) and the dust collecting box (18) through a pipeline.

9. A mixer as claimed in claim 8, characterised in that, The top of the barrel body (1) is further provided with a dust collecting cover (19) for sucking powder, the bottom of the dust collecting cover (19) is provided with an inlet, and the inlet covers the entire top of the barrel body (1), the top of the dust collecting cover (19) is provided with an outlet, and the outlet is connected to the dust collecting box (18) through a pipeline.

10. A mixer according to claim 1 or 2, characterised in that The air inlet pipe (5) is vertically arranged and fixed on the bottom surface of the barrel body (1), and the side of the air inlet pipe (5) is provided with an air inlet.

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