Screw type quantitative mixing device

Abstract

The utility model provides a screw type quantitative mixing device, which relates to the technical field of metal powder injection molding and comprises a mixing bin and at least two feeding bins, and feeding channels are arranged between the feeding bins and the mixing bin in a one-to-one correspondence mode. A screw rod is arranged in the feeding channel and is driven by a first driving piece to rotate so as to push materials to move in the axial direction of the screw rod; a stirring assembly driven by a second driving part to rotate is arranged in the mixing bin; wherein the first driving parts and the second driving parts are electrically connected with the control part, the control part is triggered to drive the first driving parts to drive the corresponding screw rods to rotate at a preset speed, so that the feeding proportion of the feeding bins is regulated and controlled, and meanwhile, the second driving parts are driven to drive the stirring assembly to rotate; according to the secondary material mixing device, the secondary material and the new material which enter the mixing bin are uniformly mixed, and the problems of uneven mixing, low production efficiency, inaccurate mixing proportion and material waste in the recycling and mixing process of the secondary material for metal powder injection molding in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal powder injection technology field, specifically, relate to a screw type quantitative mixing device. BACKGROUND

[0002] Metal powder injection molding technology (Metal Injection Molding, MIM technology for short) mixes metal powder and organic binder together in mixing, and adjusts the rheological property to be suitable for injection molding state. The uniformity of the mixture directly affects its flowability, and thus affects the injection molding process parameters and even the density and other properties of the final material. Because the material cost is high, the off-angle material and waste produced in the injection molding process need to be crushed and granulated for recycling. To ensure product quality and reduce the impact of secondary material on products, the secondary material is usually mixed with new material in proportion, but the feeding is often uneven due to human factors during the mixing process, resulting in low production efficiency, time-consuming and laborious, and easy to spill material, causing waste. In addition, different mixing proportions of different secondary materials and new materials require operators to repeatedly weigh the weight of the material and calculate the proportion, which is easy to confuse and cause material waste. SUMMARY

[0003] The utility model discloses a screw type quantitative mixing device, simple structure, convenient operation aims at improving the secondary material of the existing metal powder injection molding in the recycling mixing process, the problem of easy to appear mixing uneven, low production efficiency, inaccurate mixing proportion and material waste.

[0004] The utility model discloses a screw type quantitative mixing device, simple structure, convenient operation aims at improving the secondary material of the existing metal powder injection molding in the recycling mixing process, the problem of easy to appear mixing uneven, low production efficiency, inaccurate mixing proportion and material waste.

[0005] A screw type quantitative mixing device, including mixing bin and at least two feeding bins, each feeding bin with the mixing bin one-to-one corresponding setting has the feeding channel, the feeding channel is configured with the screw that is perpendicular to the feeding bin discharge direction, the screw is structured as the rotation of the first drive member drives, to push material moves along its axial direction, the mixing bin is configured with the stirring assembly, the stirring assembly is rotated via the second drive member drive, wherein, the first drive member and the second drive member are electrically connected with the control part, through the controllable way triggers the control part to drive each first drive member drives corresponding screw to rotate at the preset speed, thereby the feeding proportion of each feeding bin is regulated, and the second drive member is driven to rotate the stirring assembly at the same time, so that the secondary material and new material entering the mixing bin are uniformly mixed.

[0006] As a further improvement, the mixing bin is located below each feeding bin, the feeding channel is perpendicular to the discharge direction of the feeding bin, and the inlet thereof is communicated with the feeding bin, and the outlet thereof is communicated with the mixing bin.

[0007] As a further improvement, each of the feeding bins is provided with a block-type level switch electrically connected with the control element to control the amount of material in the feeding bin.

[0008] As a further improvement, each of the feeding bins has a decreasing cross-section from top to bottom.

[0009] As a further improvement, the stirring assembly comprises a stirring shaft and a plurality of stirring blades mounted or formed on the stirring shaft, wherein each of the stirring blades is hollowed in the middle and bent towards the rotating direction at the tail.

[0010] As a further improvement, the mixing bin has a U-shaped cross-section and is provided with a discharge pipe on each side to be connected with an injection molding machine.

[0011] As a further improvement, the mixing bin and the bottom surface of the feeding channel are each provided with a cover plate that can be opened and closed, and the cover plate is pulled to expose the material cleaning opening on the bottom surface.

[0012] As a further improvement, the cover plate is L-shaped and is provided with a guide groove along the outer periphery of the material cleaning opening, and the cover plate is inserted into the guide groove for limiting.

[0013] As a further improvement, the feeding bin for holding the secondary material is provided with a material discharge opening near the discharge opening, and the outlet end of the material discharge opening is provided with a detachable cover.

[0014] As a further improvement, the first driving element is an electric motor, and the second driving element is a motor.

[0015] By adopting the above technical scheme, the following technical effects can be achieved:

[0016] 1. Each feeding bin and the mixing bin is provided with a feeding channel, and the control element drives each first driving element to drive the corresponding screw to rotate at a predetermined speed to control the feeding speed of each feeding bin, thereby realizing quantitative mixing and accurately controlling the mixing ratio, without manual mixing, ensuring mixing efficiency, and avoiding material waste caused by spilling and incorrect mixing ratio during the mixing process. At the same time, the control element drives the second driving element to drive the stirring assembly to rotate, so that the stirring time and stirring speed are controllable, thereby ensuring uniform stirring of the secondary material and the new material entering the mixing bin.

[0017] 2. Each feeding bin is provided with a block-type level switch electrically connected with the control element to control the amount of material in the feeding bin. The control element displays the information that the material is full, thereby stopping the feeding. This avoids leaving too much material in the feeding bin after the mixing operation is completed.

[0018] 3. The cross section of each feeding bin decreases from top to bottom, so that the material is gathered to the discharge port at the bottom under the action of gravity, realizing automatic feeding of the material in the feeding bin.

[0019] 4. The middle part of each stirring blade is hollow, which can reduce the resistance of the stirring blade during stirring. The tail part of the stirring blade is bent towards the rotation direction, so as to shovel the material and accelerate the mixing of the material during rotation.

[0020] 5. The mixing bin is provided with discharge pipes on both sides, which can supply material to two injection molding machines, and accelerate the production efficiency.

[0021] 6. The bottom surface of the mixing bin and the feeding channel is provided with a cover plate which can be opened and closed. The cover plate is pulled out to expose the bottom surface of the cleaning port. On the one hand, it can facilitate the operator to clean or wash the device, and on the other hand, it can ensure that there is no material residue in the feeding channel and the mixing bin, and ensure the accuracy of the material mixing ratio. Further, the cover plate is L-shaped, and a guide groove is arranged along the outer periphery of the cleaning port. The cover plate is inserted into the guide groove for limiting, and the L-shaped arrangement facilitates pulling out.

[0022] 7. The feeding bin for containing the secondary material is provided with a discharge port near the discharge port, and a detachable cover is arranged at the outlet end of the discharge port. When a fault or other problem occurs and rapid discharge is required, the cover is opened to quickly discharge the secondary material in the feeding bin. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figures 1 to 3 is a structure schematic view of one embodiment of the present application at different viewing angles;

[0025] Figures 4 to 6 is a sectional view of one embodiment of the present application along different sections;

[0026] Figure 7 and Figure 8 is a structure schematic view of one embodiment of the present application when the hidden part of the mixing bin structure is hidden;

[0027] Figure 9 is a structure schematic view of the screw of one embodiment of the present application.

[0028] FIG.:

[0029] 1-mixing bin; 11-discharge pipe;

[0030] 2 - feed bin; 21 - first feed bin; 22 - second feed bin; 23 - second boss; 24 - handle; 25 - spin - on level switch; 251 - rotating vane; 26 - discharge port; 261 - discharge tube;

[0031] 3 - feed channel; 31 - inlet; 32 - outlet; 33 - first boss;

[0032] 4 - screw; 41 - helical blade;

[0033] 5 - first drive member;

[0034] 6 - agitator assembly; 61 - agitator shaft; 62 - agitator blade; 621 - hollowed out; 622 - tail;

[0035] 7 - second drive member;

[0036] 8 - cover plate; 81 - first cover plate; 82 - second cover plate; 83 - hand-held end. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents the selected embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] Embodiments

[0039] In combination with Figures 1 to 9The embodiment provides a screw type quantitative mixing device, which comprises a mixing bin 1 and at least two feeding bins 2, and a feeding channel 3 is arranged between each feeding bin 2 and the mixing bin 1 in one-to-one correspondence; a screw 4 which is perpendicular to the discharging direction of the feeding bin 2 is arranged in the feeding channel 3, and the screw 4 is configured to rotate by a first driving element 5 to push the material to move along the axial direction; a stirring assembly 6 is arranged in the mixing bin 1, and the stirring assembly 6 is driven to rotate by a second driving element 7; wherein the first driving element 5 and the second driving element 7 are electrically connected with a control element, and the control element is triggered in an operable manner to drive each first driving element 5 to drive the corresponding screw 4 to rotate at a preset speed, so as to control the feeding ratio of each feeding bin 2, and at the same time, the second driving element 7 is driven to drive the stirring assembly 6 to rotate, so that the secondary material and the new material entering the mixing bin 1 are uniformly mixed.

[0040] In one embodiment, the mixing device comprises two feeding bins 2, namely a first feeding bin 21 and a second feeding bin 22, the first feeding bin 21 is used to contain the secondary material, and the first feeding bin 21 can be connected with the outlet 32 of the crusher or the secondary material after being crushed is directly poured into the first feeding bin 21; the second feeding bin 22 is used to contain the new material, and the new material can be directly poured into the second feeding bin 22. A first screw is arranged in the first feeding channel 3 connecting the first feeding bin 21 and the mixing bin 1, and a second screw is arranged in the second feeding channel 3 connecting the second feeding bin 22 and the mixing bin 1, the first screw 4 is driven to rotate at a first rotating speed and the second screw 4 is driven to rotate at a second rotating speed by the control element, wherein the first rotating speed and the second rotating speed are the same or different, and the axial movement of the material along the screw 4 is realized by the friction force of the helical blade 41 on the screw 4, so as to realize the quantitative mixing of the secondary material and the new material. The mixing ratio can be obtained according to the material amount pushed out by the screw at different rotating speeds through experiments, and is not limited to this. In other embodiments, three or more feeding bins 2 can be arranged to contain multiple materials, so as to realize the mixing of multiple materials, for example, the mixing of two new materials and secondary materials, or the mixing of two secondary materials and new materials, and the like, which are not specifically limited. The control element comprises a man-machine interaction interface and a PCB board or a PLC, the man-machine interaction interface is preferably a touch screen, the first driving element 5 is preferably a motor, and the second driving element 7 is preferably a motor. The circuit principle and structure between the control element and the driving element are prior art, and are not described here.

[0041] It should be noted that in the present embodiment, each feeding bin 2 is provided with a feeding channel 3, and the control member drives each first driving member 5 to drive the corresponding screw 4 to rotate at a preset speed, so as to control the feeding speed of each feeding bin 2, thereby realizing quantitative mixing. By setting the speed through the control member, the mixing ratio can be accurately controlled, manual mixing is not required, the mixing efficiency is ensured, and material waste caused by spilling and incorrect mixing ratio during mixing is avoided. At the same time, the second driving member 7 is driven by the control member to drive the stirring assembly 6 to rotate, so that the stirring time and stirring speed are controllable, so as to ensure that the secondary material and the new material entering the mixing bin 1 are uniformly stirred.

[0042] In a preferred embodiment, the mixing bin 1 is located below each feeding bin 2, the feeding channel 3 is arranged perpendicular to the discharging direction of the feeding bin 2, the inlet 31 of the feeding channel 3 is in communication with the feeding bin 2, and the outlet 32 of the feeding channel 3 is in communication with the mixing bin 1. The arrangement of the feeding channel 3 perpendicular to the discharging direction of the feeding bin 2 can reduce the occupation of the structural space, reduce the size of the device, and make the device more compact. One end of the screw 4 cooperates with the first driving member 5 to rotate synchronously, and the other end is fixed on the feeding channel 3 through a bearing. During mixing, the material falls from the feeding bin 2 into the inlet 31 of the feeding channel 3 and is located at the starting end of the screw 4. When the screw 4 rotates, the helical blade 41 pushes the material to the tail end of the screw 4 and falls into the mixing bin 1 from the outlet 32. In one embodiment, the feeding channel 3 is integrally formed with the mixing bin 1 and located on one side of the mixing bin 1. A first boss 33 is arranged outside the outer wall of the feeding channel 3 and provided with a first mounting hole. Each feeding bin 2 is also integrally formed, and the outer wall of the feeding bin 2 extends outwardly and has a second boss 23 provided with a second mounting hole corresponding to the first mounting hole. During installation, the first mounting hole and the second mounting hole are aligned and fixed by a bolt and a nut, so that the feeding bin 2 and the feeding channel 3 are fixed. During disassembly, the nut is loosened, the bolt is removed, and then the handle 24 on one side of the feeding bin 2 is held to pull out the feeding bin 2 in the horizontal direction, so that the feeding bin 2 is convenient to disassemble and assemble.

[0043] Further, each feeding bin 2 is provided with a resistance-rotation type material level switch 25 electrically connected to the control member, for controlling the amount of material in the feeding bin 2. The resistance-rotation type material level switch 25 includes a pressure sensor and a rotating piece 251. When the pressure sensor detects that the rotating pressure of the rotating piece 251 reaches a set value, a signal is transmitted to the control member, and information that the material is full is displayed through the control member, so as to stop feeding. The height of the resistance-rotation type material level switch 25 in different feeding bins 2 can be different, so that the amount of material in the feeding bin 2 matches the feeding ratio, and avoids that too much material remains in the feeding bin 2 after the mixing operation is completed.

[0044] In another embodiment, each feed bin 2 is tapered from top to bottom in cross section, so that the material is collected at the bottom discharge opening under the action of gravity. Preferably, the shape is funnel-shaped, and in one embodiment, two funnels with four sides inclined from the feed direction to the discharge opening are formed into two feed bins 2.

[0045] On the basis of the above embodiments, in an optional embodiment of the present application, referring to Figure 7 and Figure 8 The stirring assembly 6 comprises a stirring shaft 61 and a plurality of stirring blades 62 mounted or formed on the stirring shaft 61, wherein the middle part of each stirring blade 62 is hollow 621, which can reduce the resistance of the stirring blade 62 during stirring, and the tail part 622 of the stirring blade 62 is bent towards the rotation direction, so as to shovel the material during rotation and accelerate the mixing of the material.

[0046] For example, the cross section of the mixing bin 1 is U-shaped, and both sides are provided with discharge pipes 11 for connecting with injection molding machines. The radius of the bottom of the U-shaped is close to the rotation radius of the stirring blade 62, so that the stirring blade 62 can be as close as possible to the inner wall of the mixing bin 1 during rotation, reducing the stirring dead angle and ensuring that the material in the mixing bin 1 can be fully mixed. Among them, the mixing bin 1 is provided with discharge pipes 11 on both sides, which can supply material to two injection molding machines and accelerate production efficiency.

[0047] In other embodiments, the bottom surface of the mixing bin 1 and the bottom surface of the feeding channel 3 are provided with openable and closable cover plates 8, and the cover plates 8 are pulled out to expose the bottom surface of the cleaning port. For example, the bottom surface of the mixing bin 1 is provided with a first cover plate 81, and the bottom surface of the feeding channel 3 is provided with a second cover plate 82. The operator can pull out the second cover plate 82 and the first cover plate 81 in sequence before or after mixing, and clean the residual material in the feeding channel 3 and the mixing bin 1. The cleaning port can facilitate the operator to clean or wash the device, and can also ensure that there is no residual material in the feeding channel 3 and the mixing bin 1, so as to ensure the accuracy of the material mixing ratio.

[0048] Preferably, the cover plate 8 is L-shaped, and a guide groove is provided along the outer periphery of the cleaning port, and the cover plate 8 is inserted into the guide groove for limiting. The guide groove is a straight groove, one end of the L-shaped is an insertion end, and the other end is a hand holding end 83. During installation, the operator inserts the insertion end along the guide groove by the hand holding end 83, and limits the hand holding end 83 abutting on the outer wall of the guide groove. Preferably, the hand holding end 83 protrudes from the outer wall of the guide groove, which facilitates the pulling of the cover plate 8.

[0049] On the basis of the above-mentioned embodiments, in an optional embodiment of the utility model, the feed bin 2 for containing secondary material is provided with a discharge port 26 at a position close to the discharge port, and a detachable cover is arranged at the outlet 32 end of the discharge port 26. For example, a discharge pipe 261 extending downward along the periphery of the discharge port 26 is provided with threads, and the cover is connected with the discharge pipe 261 through the threads, so that when a fault or other problems occur and quick discharge is needed, the cover is opened, and the secondary material in the feed bin 2 is quickly discharged. In other embodiments, a discharge port 26 can also be arranged in each feed bin 2, which is not limited to this, and is not specifically limited.

[0050] The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not only limited to the above-mentioned embodiments, and any technical scheme belonging to the idea of the utility model belongs to the protection scope of the utility model.

Claims

1. A screw-type dosing mixing device, characterized in that, The mixing bin and at least two feeding bins are provided with feeding channels one by one between the mixing bin and the feeding bins; the feeding channels are configured with screws which are perpendicular to the discharging direction of the feeding bins, the screws are configured to rotate by the first driving members to push the materials to move along the axial direction; the mixing bin is configured with a stirring assembly which is driven to rotate by the second driving member; wherein the first driving members and the second driving member are electrically connected with the control member, the control member is triggered in an operable manner to drive the first driving members to drive the corresponding screws to rotate at a preset speed, so as to control the feeding ratio of each feeding bin, and at the same time, the second driving member is driven to drive the stirring assembly to rotate, so that the secondary materials and the new materials entering the mixing bin are uniformly mixed.

2. Screw-type dosing mixing device according to claim 1, characterized in that The mixing bin is located below the feeding bins, the feeding channels are arranged perpendicular to the discharging direction of the feeding bins, and the inlets of the feeding channels are communicated with the feeding bins, and the outlets of the feeding channels are communicated with the mixing bin.

3. The screw-type metering mixing device of claim 1, wherein Each of the feeding bins is provided with a blocking type material level switch which is electrically connected with the control member, to control the amount of materials in the feeding bin.

4. The screw-type metering mixing device of claim 1, wherein Each of the feeding bins is provided with a blocking type material level switch which is electrically connected with the control member, to control the amount of materials in the feeding bin.

5. The screw-type metering mixing device of claim 1, wherein, The stirring assembly includes a stirring shaft and a plurality of stirring blades which are installed or formed on the stirring shaft, wherein the middle part of each stirring blade is hollow, and the tail part is bent towards the rotating direction.

6. The screw-type metering mixing device of claim 1, wherein The cross section of the mixing bin is U-shaped, and both sides are provided with discharging pipes which are used to connect with the injection molding machine.

7. The screw-type metering mixing device of claim 1, wherein The bottom surface of the mixing bin and the feeding channel is provided with a cover plate which can be opened and closed, and the cover plate is pulled out to expose the cleaning port of the bottom surface.

8. Screw-type dosing mixing device according to claim 7, characterized in that The cover plate is L-shaped, and is provided with a guide groove along the outer periphery of the cleaning port, and the cover plate is inserted into the guide groove for limiting.

9. The screw-type metering mixing device of claim 1, wherein, The feeding bin which is used to hold the secondary materials is provided with a discharge port near the discharging port, and the outlet end of the discharge port is provided with a detachable cover.

10. Screw-type dosing and mixing device according to any one of claims 1 to 9, characterized in that The first driving member is a motor, and the second driving member is a motor.

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