Toner mixer

Abstract

The utility model discloses a toner mixing machine which comprises a shell, a mixing cavity is arranged in the shell, a raw material mixing feed port and a toner mixing feed port are further arranged on the shell, the toner mixing machine further comprises a toner feeding device, the toner feeding device comprises a toner tank, a feeding motor and a feeding screw, the toner tank is fixed on the shell, and the feeding motor is fixed on the shell. A toner storage cavity and a feeding channel are arranged in the toner tank, the feeding screw is arranged in the feeding channel, and the lower side of the feeding channel right faces the toner mixing feeding port. Toner to be fed is placed in the toner tank and stored in the toner storage cavity, the feeding motor drives the feeding screw to rotate, the toner enters the feeding channel and is filled in a screw groove of the feeding screw, the toner is driven by the feeding screw to be pushed downwards along with the screw groove of the feeding screw, the rotating angle of the feeding screw is controlled through the feeding motor, and the toner is fed into the toner storage cavity. And the amount of the toner which is conveyed downwards can be controlled, so that the amount of the toner which enters the mixing cavity can be more accurately controlled, and the matching precision of plastic particle raw materials and the toner is improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, and in particular to a color powder mixer. Background Technology

[0002] Plastic color matching refers to the process of mixing plastic granules and color powder in appropriate proportions according to the product's color requirements. The accuracy of the mixing ratio of raw materials and color powder has a significant impact on the color consistency of products from different production batches. Currently, mixing is performed using a mixer, where plastic granules and color powder are separately metered and then fed into a mixing chamber for blending. However, the accuracy of the metering ratio of raw materials and color powder is not high enough. Those skilled in the art desire a color powder mixer that can improve the accuracy of the mixing ratio of plastic granules and color powder. Utility Model Content

[0003] The main purpose of this invention is to propose a color powder mixer, which aims to solve the technical problem that the ratio of plastic granule raw materials and color powder is not accurate enough in the existing technology.

[0004] To achieve the above objectives, this utility model proposes a color powder mixer, including a housing, a mixing chamber inside the housing, and a raw material mixing inlet and a color powder mixing inlet communicating with the mixing chamber. The color powder mixer also includes a color powder feeding device, which includes a powder tank, a feeding motor, and a feeding screw. The powder tank is fixed to the housing, and the feeding motor is fixedly connected to the housing. The powder tank has a powder storage chamber and a feeding channel located on the lower side of the powder storage chamber. The feeding screw is located in the feeding channel, and the feeding motor is drivenly connected to the feeding screw. The lower side of the feeding channel is directly opposite the color powder mixing inlet.

[0005] The color powder to be fed is placed into the powder tank and stored in the powder storage chamber. The feeding motor drives the feeding screw to rotate, and the color powder enters the feeding channel and fills the screw groove of the feeding screw. Driven by the feeding screw, the color powder is pushed downward along the screw groove. By controlling the rotation angle of the feeding screw through the feeding motor, the amount of color powder fed downward can be controlled, thereby more accurately controlling the amount of color powder entering the mixing chamber and improving the accuracy of the ratio of plastic granules and color powder.

[0006] Preferably, an elastic sheet is fixedly connected to the lower end of the feeding screw. The outer diameter of the elastic sheet is matched with the inner diameter of the feeding channel. Under normal conditions, the elastic sheet can close the feeding channel. When feeding, the elastic sheet can be squeezed and deformed by the color powder to open the lower end of the feeding channel.

[0007] As the pigment powder is fed downwards, the feeding screw conveys the pigment powder downwards. The pigment powder at the bottom edge will press down on the elastic sheet, causing the elastic sheet to deform and open the lower end of the feeding channel, allowing the pigment powder to fall downwards and be fed out. When the required amount of pigment powder is reached, the feeding screw stops rotating, the pigment powder stops pressing down, and the elastic sheet will immediately rebound to close the feeding channel, preventing the pigment powder from being fed out any further. This allows for more precise control of the amount of pigment powder fed out.

[0008] Preferably, the feeding motor is located above the powder tank, and the color powder feeding device further includes a connecting shaft, which is drivenly connected to the feeding motor. The feeding screw is rotatably connected to the powder tank, and the upper end of the feeding screw protrudes from the upper side of the powder tank. The connecting shaft is located on the upper side of the feeding screw, and the axis of the connecting shaft is coaxial with the axis of the feeding screw. The connecting shaft is detachably connected to the feeding screw, and the lower side of the powder tank is detachably connected to the housing.

[0009] The upper side of the feeding screw is detachably connected to the connecting shaft, and the lower side of the powder tank is detachably connected to the housing, so that the powder tank and the feeding screw can be removed from the color powder mixer, making it easy to remove and clean when changing to different colors of color powder.

[0010] Preferably, the powder tank has a mounting plate on its lower side, and two pressure blocks are rotatably connected to the housing. The two pressure blocks are located on the upper side of the mounting plate, and the feeding channel is located between the two pressure blocks. Each pressure block has a hinge and a fastening part. The feeding channel is located between the hinge and the fastening part. The pressure block is rotatably connected to the housing through the hinge. The color powder feeding device also includes a fastening shaft, which is movably connected to the fastening parts of the two pressure blocks. The housing is also provided with a locking mechanism that matches the fastening shaft. The two pressure blocks can press down on the mounting plate and fasten it through the fastening shaft and the locking mechanism.

[0011] The powder tank is securely fixed by pressing down the mounting plate on the lower side of the powder tank with two pressure blocks, and the pressure blocks are pressed down by the fastening shaft and locking mechanism, which makes disassembly and assembly relatively convenient.

[0012] Preferably, the pigment feeding device further includes a third gate assembly, which is disposed between the feeding channel and the pigment mixing inlet. The third gate assembly is used to connect or close the feeding channel and the pigment mixing inlet. When the feeding of pigment stops, the third gate assembly can close the feeding channel and the pigment mixing inlet, preventing pigment from entering the mixing chamber and improving the control accuracy of the pigment quantity.

[0013] Preferably, a stirring bar is also fixed on the feeding screw, and the stirring bar is disposed inside the powder storage chamber. The stirring bar rotates together with the feeding screw, and can stir the color powder in the storage chamber, reducing the clumping and voids of the color powder in the storage chamber, so that the color powder can enter the screw groove of the feeding screw more smoothly and tightly, making the rotation angle of the feeding screw more consistent with the amount of color powder delivered, and improving the accuracy of color powder delivery.

[0014] Preferably, the feeding motor is a servo motor or a stepper motor, which can precisely control the rotation angle of the feeding screw.

[0015] Preferably, the color powder mixer further includes a raw material feeding device, which includes a raw material feeding channel, a first feeding gate assembly, a second feeding gate assembly, and a full-material detection device. The raw material feeding channel includes a detection section and a metering section. The detection section is located above the metering section, and a raw material inlet is provided on the upper side of the detection section. At least a portion of the detection section is transparent. The full-material detection device is located outside the detection section and directly opposite the transparent section. The full-material detection device is used to detect whether the raw material has filled the metering section and reached the detection section. The first feeding gate assembly is located between the detection section and the metering section. The first feeding gate assembly is used to connect or close the detection section and the metering section. The lower side of the metering section is directly opposite the raw material mixing inlet. The second feeding gate assembly is located between the metering section and the raw material mixing inlet. The second feeding gate assembly is used to connect or close the metering section and the raw material mixing inlet.

[0016] The feeding rate of plastic granules is controlled by a raw material feeding device. During feeding, the second feeding gate assembly first closes the raw material mixing inlet, while the first feeding gate assembly opens. Then, plastic granules are added into the raw material feeding channel from the raw material inlet. Under the action of the second feeding gate assembly, the plastic granules continuously pile up, filling the metering section and rising to the detection section. Feeding stops when the full-material detection device detects the plastic granules reaching the detection section through the transparent part. Next, the first feeding gate assembly inserts into the plastic granules and closes the upper side of the metering section. Then, the second feeding gate assembly opens, and the plastic granules filling the metering section are fed downwards through the raw material mixing inlet. This invention, by adding plastic granules to fill the metering section and pile them up to the detection section, ensures a consistent amount of plastic granules within the metering section, resulting in a consistent amount of plastic granules fed out each time, thus improving the feeding accuracy of the plastic granules.

[0017] Preferably, the mixing chamber is provided with a stirring element, which includes multiple stirring blades, and a stirring drive motor is fixed on the housing, which is connected to the stirring element in a transmission manner.

[0018] Preferably, the mixing chamber is provided with a mixing outlet on its lower side, and the housing is provided with a feeding opening and closing assembly. The feeding opening and closing assembly includes a feeding plate and a feeding drive unit. The feeding plate is movably connected to the housing, and the feeding plate is driven by the feeding drive unit. The feeding drive unit can drive the feeding plate to open or close the mixing outlet. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0022] Figure 3 This is a schematic diagram of the color powder feeding device of this utility model;

[0023] Figure 4 This is a schematic diagram of the powder tank and feeding screw of this utility model;

[0024] Figure 5 This is a cross-sectional view of the powder container and feeding screw of this utility model.

[0025] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0026] Figure 7 This is a schematic diagram of the mixing chamber part of this utility model.

[0027] In the attached diagram: 1-Shell, 11-Mixing chamber, 12-Raw material mixing inlet, 13-Color powder mixing inlet, 14-Mixing outlet, 21-Powder tank, 211-Powder storage chamber, 212-Feeding channel, 213-Mounting plate, 214-Powder inlet, 215-Cover plate, 22-Feeding motor, 23-Feeding screw, 231-Agitator bar, 232-Tenon and tenon structure, 24-Elastic sheet, 25-Connecting shaft, 26-Pressure block, 261-Hinge, 262-Snap-fitting part, 27-Snap-fitting shaft, 28-Locking mechanism. 29-Third gate assembly, 291-Third drive unit, 292-Third brake plate, 31-Raw material feeding channel, 311-Detection section, 312-Quantitative section, 32-First feeding gate assembly, 321-First drive unit, 322-First brake plate, 33-Second feeding gate assembly, 331-Second drive unit, 332-Second brake plate, 34-Full material detection device, 35-Raw material inlet, 4-Agitator, 41-Agitator blade, 42-Agitator drive motor, 51-Discharge plate, 52-Discharge drive unit.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] like Figures 1 to 7 As shown, a color powder mixer includes a housing 1, a mixing chamber 11 inside the housing 1, and a raw material mixing inlet 12 and a color powder mixing inlet 13 communicating with the mixing chamber 11. Plastic particles and color powder enter the mixing chamber 11 from the raw material mixing inlet 12 and the color powder mixing inlet 13 respectively and are mixed. It is necessary to control the amount of plastic particles and color powder entering the mixing chamber 11 to achieve the required ratio.

[0033] The color powder mixer also includes a color powder feeding device, which includes a powder tank 21, a feeding motor 22, and a feeding screw 23. The powder tank 21 is fixed to the housing 1, and the feeding motor 22 is fixedly connected to the housing 1. The powder tank 21 has a powder storage chamber 211 and a feeding channel 212 located on the lower side of the powder storage chamber 211. (Refer to...) Figure 5 The feeding screw 23 is located in the feeding channel 212. The outer diameter of the feeding screw 23 is matched with the inner diameter of the feeding channel 212 so that the color powder is kept in the screw groove of the feeding screw 23. The feeding motor 22 is connected to the feeding screw 23 for transmission. The lower side of the feeding channel 212 is directly opposite the color powder mixing inlet 13.

[0034] The color powder to be fed is placed into the powder tank 21 and stored in the powder storage chamber 211. The feeding motor 22 drives the feeding screw 23 to rotate. The color powder enters the feeding channel 212 and fills the screw groove of the feeding screw 23. Driven by the feeding screw 23, the color powder is pushed downward along the screw groove of the feeding screw 23. By controlling the rotation angle of the feeding screw 23 by the feeding motor 22, the amount of color powder fed downward can be controlled, thereby more accurately controlling the amount of color powder entering the mixing chamber 11 and improving the accuracy of the ratio of plastic granule raw material and color powder.

[0035] In some specific embodiments, reference is made to Figure 5 and Figure 6 An elastic sheet 24 is fixedly connected to the lower end of the feeding screw 23. Specifically, the middle part of the elastic sheet 24 can be fixed to the lower end face of the feeding screw 23 by screws. The elastic sheet 24 can be an elastic rubber sheet or other plastic sheet. The outer diameter of the elastic sheet 24 is matched with the inner diameter of the feeding channel 212. Under normal conditions, the elastic sheet 24 can close the feeding channel 212. When feeding, the elastic sheet 24 can be squeezed and deformed by the color powder to open the lower end of the feeding channel 212.

[0036] As the pigment powder is fed downwards, the feeding screw 23 conveys the pigment powder downwards, and the pigment powder at the bottom edge will press down on the elastic sheet 24, causing the outer periphery of the elastic sheet 24 to deform downwards and open the lower end of the feeding channel 212, allowing the pigment powder to fall downwards and be fed out. When the required amount of pigment powder is reached, the feeding screw 23 stops rotating, the pigment powder is no longer pressed downwards, and the elastic sheet 24 will immediately rebound and close the feeding channel 212, preventing the pigment powder from being fed out. This allows for more precise control of the amount of pigment powder fed out.

[0037] In some specific embodiments, the feeding motor 22 is located above the powder tank 21. The color powder feeding device also includes a connecting shaft 25, which is connected to the feeding motor 22 in a transmission manner. The connecting shaft 25 can be directly fixed to the output shaft of the feeding motor 22 or connected to the output shaft of the feeding motor 22 through other transmission structures. The feeding screw 23 is rotatably connected to the powder tank 21. The upper end of the feeding screw 23 protrudes from the upper side of the powder tank 21. The connecting shaft 25 is located on the upper side of the feeding screw 23. The axis of the connecting shaft 25 is coaxial with the axis of the feeding screw 23. The connecting shaft 25 is detachably connected to the feeding screw 23. The lower side of the powder tank 21 is detachably connected to the housing 1.

[0038] The upper side of the feeding screw 23 is detachably connected to the connecting shaft 25, and the lower side of the powder tank 21 is detachably connected to the housing 1, allowing the powder tank 21 and the feeding screw 23 to be removed from the color powder mixer. This facilitates removal and cleaning when changing to different colors of color powder. After removal, as... Figure 4 As shown. The powder container 21 is provided with a powder inlet 214, and the powder inlet 214 is provided with a cover plate 215. When adding color powder, the cover plate 215 is opened, and the cover plate 215 is closed after adding.

[0039] Furthermore, referring to Figure 3 The powder tank 21 has an installation plate 213 on its lower side. Two pressure blocks 26 are rotatably connected to the housing 1. The two pressure blocks 26 are located on the upper side of the installation plate 213. The feeding channel 212 is located between the two pressure blocks 26. The pressure blocks 26 are provided with a hinge part 261 and a fastening part 262. The feeding channel 212 is located between the hinge part 261 and the fastening part 262. The pressure blocks 26 are rotatably connected to the housing 1 through the hinge part 261. The color powder feeding device also includes a fastening shaft 27. The fastening shaft 27 is movably connected to the fastening part 262 of the two pressure blocks 26. The housing 1 is also provided with a locking mechanism 28 that matches the fastening shaft 27. The two pressure blocks 26 can press down on the installation plate 213 and be fastened by the fastening shaft 27 and the locking mechanism 28.

[0040] Two pressure blocks 26 press down on the mounting plate 213 on the lower side of the powder tank 21. A fastening shaft 27 connects to the fastening parts 262 of the two pressure blocks 26, and the pressure blocks 26 are pressed down by the fastening shaft 27 and the locking mechanism 28, thus stably installing and fixing the powder tank 21. The fastening part 262 can be a hole or a groove. Preferably, the locking mechanism 28 fastens the fastening shaft 27 between the two pressure blocks 26. When removing the powder tank 21, release the locking mechanism 28, remove the fastening shaft 27 to avoid obstructing the powder tank 21, then rotate the pressure blocks 26 upwards to move them away from the pressure plate, and then separate the feeding screw 23 and the connecting shaft 25 to remove the powder tank 21. Disassembly and assembly are relatively convenient. The locking mechanism 28 can be an existing type of fastener, such as a snap fastener.

[0041] Furthermore, the connecting shaft 25 and the feeding screw 23 can be connected by screws or by mortise and tenon structure 232, etc.

[0042] In some specific embodiments, the color powder feeding device further includes a third gate assembly 29, which is disposed between the feeding channel 212 and the color powder mixing inlet 13. The third gate assembly 29 is used to connect or close the feeding channel 212 and the color powder mixing inlet 13.

[0043] When the feeding of color powder stops, the third gate assembly 29 can close the feeding channel 212 and the color powder mixing inlet 13, preventing color powder from entering the mixing chamber 11 and improving the control accuracy of the color powder quantity. Furthermore, the third gate assembly 29 includes a third drive unit 291 and a third brake plate 292. The third brake plate 292 is perpendicular to the feeding channel 212. The third drive unit 291 can drive the third brake plate 292 away from the feeding channel 212 to open the feeding channel 212 or insert it into the feeding channel 212 to close it. The third drive unit 291 can be a cylinder.

[0044] In some specific embodiments, reference is made to Figure 5 A stirring bar 231 is also fixed on the feeding screw 23, and the stirring bar 231 is located in the powder storage chamber 211. The stirring bar 231 rotates together with the feeding screw 23, and can stir the color powder in the storage chamber, reduce the agglomeration and voids of the color powder in the storage chamber, so that the color powder can enter the screw groove of the feeding screw 23 more smoothly and tightly, making the rotation angle of the feeding screw 23 more consistent with the amount of color powder fed out, and improving the accuracy of color powder feeding.

[0045] In some specific embodiments, the feeding motor 22 is a servo motor or a stepper motor, which can precisely control the rotation angle of the feeding screw 23.

[0046] In some specific embodiments, reference is made to Figure 1 and Figure 2The color powder mixer also includes a raw material feeding device, which includes a raw material feeding channel 31, a first feeding gate assembly 32, a second feeding gate assembly 33, and a full material detection device 34.

[0047] The raw material feeding channel 31 includes a detection section 311 and a metering section 312. The detection section 311 is located above the metering section 312. A raw material inlet 35 is provided on the upper side of the detection section 311. At least part of the detection section 311 is transparent. A full material detection device 34 is located outside the detection section 311 and directly opposite the transparent part. The full material detection device 34 is used to detect whether the raw material has filled the metering section 312 and reached the detection section 311. A first feeding gate assembly 32 is located between the detection section 311 and the metering section 312. The first feeding gate assembly 32 is used to connect or close the detection section 311 and the metering section 312. The lower side of the metering section 312 is directly opposite the raw material mixing inlet 12. A second feeding gate assembly 33 is located between the metering section 312 and the raw material mixing inlet 12. The second feeding gate assembly 33 is used to connect or close the metering section 312 and the raw material mixing inlet 12.

[0048] The feeding rate of plastic granules is controlled by a raw material feeding device. During feeding, the second feeding gate assembly 33 first closes the raw material mixing inlet 12, and the first feeding gate assembly 32 opens. Then, plastic granules are added into the raw material feeding channel 31 from the raw material inlet 35. Under the action of the second feeding gate assembly 33, the plastic granules continuously pile up, fill the metering section 312, and rise to the detection section 311 until the full material detection device 34 detects through the transparent part that the plastic granules have piled up to the detection section 311, at which point feeding stops. Next, the first feeding gate assembly 32 is inserted into the plastic granules and closes the upper side of the metering section 312. Then, the second feeding gate assembly 33 opens, and the plastic granules filled in the metering section 312 are sent downward through the raw material mixing inlet 12. This invention improves the feeding accuracy of plastic granules by adding plastic granules to fill the metering section 312 and pile them up to the detection section 311, ensuring that the amount of plastic granules in the metering section 312 is the same, and that the amount of plastic granules sent out each time is the same.

[0049] Furthermore, the first gate assembly includes a first drive unit 321 and a first brake plate 322. The first brake plate 322 is perpendicular to the upper side of the metering section 312. The first drive unit 321 can drive the first brake plate 322 away from the metering section 312 to open the metering section 312 or insert it into the metering section 312 to close the upper side of the metering section 312. The second gate assembly includes a second drive unit 331 and a second brake plate 332. The second brake plate 332 is perpendicular to the lower side of the metering section 312. The second drive unit 331 can drive the second brake plate 332 away from the metering section 312 to open the metering section 312 or insert it into the metering section 312 to close the lower side of the metering section 312. The first drive unit 321 and the second drive unit 331 can be cylinders.

[0050] Furthermore, the full material detection device 34 can be a photoelectric sensor or the like, which generates a signal change when plastic particles pass through the detection area. When plastic particles are added and the quantitative section 312 is not full, although plastic particles pass through the detection area, the full material detection device 34 may generate a signal, but the signal is unstable. At this time, it is not judged that the plastic particles have piled up to the detection section 311. Only when a stable signal is generated after the material is piled up is it judged that the plastic particles have piled up to the detection section 311.

[0051] In some specific embodiments, reference is made to Figure 7 The mixing chamber 11 is equipped with a stirring element 4, which includes multiple stirring blades 41. A stirring drive motor 42 is fixed on the housing 1, and the stirring drive motor 42 is connected to the stirring element 4 for transmission. During mixing, the stirring drive motor 42 drives the stirring element 4 to rotate in the mixing chamber 11, and the multiple stirring blades 41 stir the plastic particles and color powder to mix thoroughly.

[0052] In some specific embodiments, a mixing outlet 14 is provided on the lower side of the mixing chamber 11, and a feeding opening and closing assembly is provided on the housing 1. The feeding opening and closing assembly includes a feeding plate 51 and a feeding drive unit 52. The feeding plate 51 is movably connected to the housing 1, preferably the feeding plate 51 is rotatably connected to the housing 1, and the feeding plate 51 is drively connected to the feeding drive unit 52. The feeding drive unit 52 can drive the feeding plate 51 to open or close the mixing outlet 14.

[0053] Before the plastic granules and color powder enter the mixing chamber 11, the feeding drive unit 52 drives the feeding plate 51 to close the mixing outlet 14 and keep it closed during mixing; after mixing, the feeding drive unit 52 drives the feeding plate 51 to open the mixing outlet 14, and the mixed plastic granules and color powder are discharged from the mixing outlet 14.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A color powder mixer, characterized in that, The machine includes a housing (1), which has a mixing chamber (11) inside. The housing (1) also has a raw material mixing inlet (12) and a color powder mixing inlet (13) communicating with the mixing chamber (11). The color powder mixer also includes a color powder feeding device, which includes a powder tank (21), a feeding motor (22) and a feeding screw (23). The powder tank (21) is fixed on the housing (1), and the feeding motor (22) is fixedly connected to the housing (1). The powder tank (21) has a powder storage chamber (211) and a feeding channel (212) located on the lower side of the powder storage chamber (211). The feeding screw (23) is located in the feeding channel (212), and the feeding motor (22) is connected to the feeding screw (23) in a drive. The lower side of the feeding channel (212) is directly opposite the color powder mixing inlet (13).

2. The color powder mixer as described in claim 1, characterized in that, The lower end of the feeding screw (23) is fixedly connected to an elastic sheet (24). The outer diameter of the elastic sheet (24) is matched with the inner diameter of the feeding channel (212). Under normal conditions, the elastic sheet (24) can close the feeding channel (212). When feeding, the elastic sheet (24) can be squeezed and deformed by the color powder to open the lower end of the feeding channel (212).

3. The color powder mixer as described in claim 1, characterized in that, The feeding motor (22) is located above the powder tank (21). The color powder feeding device also includes a connecting shaft (25). The connecting shaft (25) is connected to the feeding motor (22) in a transmission manner. The feeding screw (23) is rotatably connected to the powder tank (21). The upper end of the feeding screw (23) protrudes from the upper side of the powder tank (21). The connecting shaft (25) is located on the upper side of the feeding screw (23). The axis of the connecting shaft (25) is coaxial with the axis of the feeding screw (23). The connecting shaft (25) is detachably connected to the feeding screw (23). The lower side of the powder tank (21) is detachably connected to the housing (1).

4. The color powder mixer as described in claim 3, characterized in that, The powder tank (21) has a mounting plate (213) on its lower side. Two pressure blocks (26) are rotatably connected to the housing (1). The two pressure blocks (26) are located on the upper side of the mounting plate (213). The feeding channel (212) is located between the two pressure blocks (26). The pressure blocks (26) are provided with a hinge (261) and a fastening part (262). The feeding channel (212) is located between the hinge (261) and the fastening part (262). 6) The color powder feeding device is rotatably connected to the housing (1) through the hinge (261). The color powder feeding device also includes a fastening shaft (27). The fastening shaft (27) is movably connected to the fastening part (262) of the two pressure blocks (26). The housing (1) is also provided with a locking mechanism (28) that matches the fastening shaft (27). The two pressure blocks (26) can press down on the mounting plate (213) and fasten it through the fastening shaft (27) and the locking mechanism (28).

5. The color powder mixer as described in claim 3, characterized in that, The color powder feeding device also includes a third gate assembly (29), which is located between the feeding channel (212) and the color powder mixing inlet (13). The third gate assembly (29) is used to connect or close the feeding channel (212) and the color powder mixing inlet (13).

6. The color powder mixer as described in claim 1, characterized in that, A stirring bar (231) is also fixed on the feeding screw (23), and the stirring bar (231) is located in the powder storage cavity (211).

7. The color powder mixer as described in claim 1, characterized in that, The feeding motor (22) is a servo motor or a stepper motor.

8. The color powder mixer as described in claim 1, characterized in that, The color powder mixer also includes a raw material feeding device, which includes a raw material feeding channel (31), a first feeding gate assembly (32), a second feeding gate assembly (33), and a full material detection device (34). The raw material feeding channel (31) includes a detection section (311) and a metering section (312). The detection section (311) is located above the metering section (312). A raw material inlet (35) is provided on the upper side of the detection section (311). At least part of the detection section (311) is transparent. The full material detection device (34) is located outside the detection section (311) and directly opposite the transparent part. The full material detection device (34) is used to detect whether the raw material has filled the metering section (312) and reached the detection section (311). The first feeding gate assembly (32) Located between the detection section (311) and the quantitative section (312), the first feeding gate assembly (32) is used to connect or close the detection section (311) and the quantitative section (312), the lower side of the quantitative section (312) is directly opposite the raw material mixing inlet (12), and the second feeding gate assembly (33) is located between the quantitative section (312) and the raw material mixing inlet (12), and the second feeding gate assembly (33) is used to connect or close the quantitative section (312) and the raw material mixing inlet (12).

9. The color powder mixer as described in claim 1, characterized in that, The mixing chamber (11) is provided with a stirring element (4), which includes multiple stirring blades (41). A stirring drive motor (42) is fixed on the housing (1), and the stirring drive motor (42) is connected to the stirring element (4) in a transmission connection.

10. The color powder mixer as described in claim 1, characterized in that, The mixing chamber (11) has a mixing outlet (14) on its lower side. The housing (1) has a feeding opening and closing assembly, which includes a feeding plate (51) and a feeding drive unit (52). The feeding plate (51) is movably connected to the housing (1), and the feeding plate (51) is driven to the feeding drive unit (52). The feeding drive unit (52) can drive the feeding plate (51) to open or close the mixing outlet (14).

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