Small-flow weightlessness type feeding machine

Abstract

The utility model discloses a small-flow weightlessness type feeding machine which comprises a frame body, a first hopper, a second hopper, a stirring assembly and a transmission assembly, and the frame body is provided with a discharge port and a weighing unit; the first hopper is provided with a first cavity for placing materials; the second hopper is connected to the bottom of the first hopper and provided with a second cavity communicated with the first cavity, and the second hopper is connected to the frame body through a stirring assembly so that materials stirred by the stirring assembly can be discharged along a discharging opening in the bottom of the second hopper; the transmission assembly is located at the bottom of the discharging port and comprises two adjacent screw rods with the axes parallel to each other, the two screw rods are provided with threads meshed with each other so as to drive materials passing through the discharging port to be discharged to the discharging port, and the weight of the materials discharged along the discharging port within a certain time can be obtained through the weighing unit. And the two screws are provided with threads which are meshed with each other, so that the adhesion between the materials and the transmission assembly can be reduced and even avoided while the materials passing through the feed opening are driven to be discharged to the discharge opening.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic metering equipment, in particular to a small flow rate weightlessness feeder. Background Art

[0002] With the continuous promotion and popularization of continuous manufacturing and smart factories, enterprises have increasing performance requirements for manufacturing equipment. As an important member of the field of automatic metering equipment, feeders also need to be continuously improved and perfected to meet current market requirements.

[0003] Feeders can be divided into volumetric feeding and loss-in-weight feeding according to the material metering method. The principle of volumetric feeding is to rely on the physical mechanical gap of the screw groove and the weight of the material. Under the rotation of the feeding screw, the material is continuously rotated out of the feeding hopper; the structure of loss-in-weight feeders is relatively complex, usually with a weight sensor and a feeding control system. The weight sensor senses the change of the material per unit time and transmits the signal to the feeding control system. The feeding system sends the required speed of the motor to the frequency converter in the form of a current signal according to the parameters set by the operator, and the frequency converter controls the speed of the feeder.

[0004] In the production process, when the existing loss-in-weight feeder is fed for a long time, the material accumulates in the hopper. Driven by the continuous rotation of the feeding screw, some materials may stick together, or even adhere to the wall of the feeding barrel and the feeding screw, and the accumulation becomes more and more, making the feeding capacity of the feeding screw worse and worse, which may cause the feeder speed to increase until the machine cannot bear it and alarms and stops, or cause the screw to run idle, and the machine also alarms and stops. For the transportation of trace materials, it is impossible to achieve precise control of the conveying volume, and the deviation far exceeds the required 5%, resulting in reduced efficiency and increased costs.

[0005] Therefore, how to reduce or even avoid the adhesion of materials to the feeder is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0006] The utility model aims to provide a small flow loss-in-weight feeder, which can reduce or even avoid the adhesion of materials to the feeder.

[0007] In order to achieve the above object, the utility model provides a small flow loss-in-weight feeder, comprising:

[0008] The frame is provided with a discharge port and a weighing unit;

[0009] A first hopper, provided with a first cavity for placing materials;

[0010] The second hopper is connected to the bottom of the first hopper and is provided with a second cavity connected to the first cavity. The second hopper is connected to the frame through a stirring assembly so that the material stirred by the stirring assembly is discharged along a discharge port at the bottom of the second hopper;

[0011] The transmission assembly is located at the bottom of the discharge port. The transmission assembly includes two adjacent screws with axes parallel to each other, and the two screws are provided with mutually meshing threads to drive the material passing through the discharge port to be discharged to the discharge port.

[0012] Preferably, the second hopper includes a hemispherical portion and a straight cylindrical portion tangentially connected to the hemispherical portion, and the straight cylindrical portion is located on the top of the hemispherical portion, and the stirring assembly includes:

[0013] A rotating shaft is rotatably connected to the frame body through a bearing, and the rotating shaft includes a first end passing through the straight tube portion, and the first end is located in the second cavity;

[0014] The connecting part, the middle part of which is sleeved on the first end and vertically connected to the rotating shaft, and the distance between the two ends of the connecting part is smaller than the diameter of the hemispherical part;

[0015] The stirring part comprises two stirring knives respectively connected to the two ends of the connecting part, so that the driven stirring knives can rotate around the axis of the rotating shaft.

[0016] Preferably, the two stirring blades are centrally symmetrical and are both arc-shaped plates, and a gap is provided between the arc-shaped plates and the inner wall of the second hopper.

[0017] Preferably, it also includes a motor arranged above the weighing unit, the output end of the motor is provided with a first gear and a second gear spaced apart, the rotating shaft is provided with a third gear meshing with the first gear, the transmission assembly also includes two rotating shafts respectively connected to the two screws, and the rotating shafts are each provided with a fourth gear meshing with the second gear, so that the rotating shaft and the rotating shaft driven by the motor rotate.

[0018] Preferably, a filter screen with a containing space is provided at one end of the screw away from the rotating shaft for accumulating materials. When the containing space of the filter screen is full of materials, the materials are discharged along the filter screen to the discharge port.

[0019] Preferably, the distance between the axes of the two screws is 17 mm-18 mm, the spacing between adjacent threads on the screw is 10 mm, and the distance between a thread and an adjacent screw is 0.08-0.1 mm.

[0020] Preferably, a reinforcement piece is provided between the first hopper and the second hopper, and a cover plate is provided on the top of the first hopper to seal the first cavity.

[0021] Preferably, the weighing unit is further provided with a shell, and the motor is located inside the shell.

[0022] Preferably, the first hopper, the second hopper, the screw and the stirring assembly are all made of 316L stainless steel.

[0023] Preferably, support legs are provided around the bottom of the frame, and the support legs are provided with shock-absorbing feet.

[0024] Compared with the above-mentioned background technology, the small-flow loss-in-weight feeder provided by the utility model includes a frame, a first hopper, a second hopper, a stirring assembly and a transmission assembly. The frame is provided with a discharge port and a weighing unit; the first hopper is provided with a first cavity for placing materials; the second hopper is connected to the bottom of the first hopper, and is provided with a second cavity connected to the first cavity, and the second hopper is connected to the frame through a stirring assembly so that the material stirred by the stirring assembly is discharged along the discharge port at the bottom of the second hopper; the transmission assembly is located at the bottom of the discharge port, and the transmission assembly includes two adjacent screws with axes parallel to each other, and the two screws are provided with mutually meshing threads to drive the material through the discharge port to be discharged to the discharge port.

[0025] Specifically, through the weighing unit provided on the frame, according to the first weight count on the weighing unit after the material enters the first cavity along the first hopper, and the second weight count on the weighing unit after part of the material is discharged along the discharge port within a certain period of time, the weight of the material discharged along the discharge port is the difference between the first weight count and the second weight count, wherein the transmission assembly located at the bottom of the discharge port includes two adjacent screws with parallel axes, and the two screws are provided with mutually meshing threads, which can drive the material through the discharge port to be discharged to the discharge port, and at the same time can reduce or even avoid the adhesion of the material and the transmission assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] FIG1 is a schematic structural diagram of a small flow rate loss-in-weight feeder provided by an embodiment of the utility model;

[0028] FIG2 is a schematic diagram of the structure of a stirring assembly provided in an embodiment of the present utility model;

[0029] FIG3 is a partial enlarged view of FIG2 ;

[0030] FIG. 4 is a schematic diagram of the structure of the filter screen provided in an embodiment of the present utility model.

[0031] in:

[0032] 110-discharging port, 120-weighing unit, 130-housing, 140-supporting leg, 150-shock-absorbing foot;

[0033] 200-first hopper, 210-first cavity, 220-reinforcement member, 230-cover plate;

[0034] 310-second cavity, 320-feeding port, 330-hemispherical portion, 340-straight cylinder portion;

[0035] 410 - rotating shaft, 411 - third gear, 420 - connecting part, 430 - stirring blade;

[0036] 500-screw, 510-rotating shaft, 520-fourth gear;

[0037] 600-motor, 610-first gear, 620-second gear;

[0038] 700-Filter. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0042] The utility model aims to provide a small flow loss-in-weight feeder, which can reduce or even avoid the adhesion of materials to the feeder.

[0043] Please refer to FIG. 1 . To achieve the above-mentioned purpose, the utility model provides a small flow loss-in-weight feeder, which includes a frame, a first hopper 200 , a second hopper, a stirring assembly and a transmission assembly.

[0044] The frame is provided with a discharge port 110 and a weighing unit 120 .

[0045] It can be understood that the weighing unit 120 has the function of weighing weight. The total weight of the material discharged from the discharge port 110 during this period of time can be obtained by the weight value after the material is added and the weight value after the material is discharged from the discharge port 110 for a period of time.

[0046] The first hopper 200 is provided with a first cavity 210 for placing materials.

[0047] The second hopper is connected to the bottom of the first hopper 200 and is provided with a second cavity 310 connected to the first cavity 210. The second hopper is connected to the frame through a stirring assembly so that the material stirred by the stirring assembly can be discharged along a discharge port 320 at the bottom of the second hopper.

[0048] It should be noted that the first hopper 200 includes an end with a larger opening and an end with a smaller opening, and the end with the smaller opening is connected to the second hopper so that the material can slide down along the end with the larger opening.

[0049] The transmission assembly is located at the bottom of the discharge port 320 , and includes two adjacent screws 500 with axes parallel to each other. The two screws 500 are provided with mutually meshing threads to drive the material passing through the discharge port 320 to be discharged to the discharge port 110 .

[0050] The material discharge port 320 is located at the bottom of the second hopper, and is used for the material stirred by the stirring assembly to slide along the second hopper to the transmission assembly, and then moved down to the discharge port 110 by the two screws 500 .

[0051] Specifically, through the weighing unit 120 provided on the frame, according to the first weight count on the weighing unit 120 after the material enters the first cavity 210 along the first hopper 200, and the second weight count on the weighing unit 120 after part of the material is discharged along the discharge port 110 within a certain period of time, the weight of the material discharged along the discharge port 110 is the difference between the first weight count and the second weight count, wherein the transmission assembly located at the bottom of the discharge port 320 includes two adjacent screws 500 with parallel axes, and the two screws 500 are provided with mutually meshing threads, which can drive the material through the discharge port 320 to be discharged to the discharge port 110, while reducing or even avoiding the adhesion of the material and the transmission assembly.

[0052] Please refer to Figures 2 and 3. Preferably, the second hopper includes a hemispherical portion 330 and a straight tube portion 340 tangentially connected to the hemispherical portion 330, and the straight tube portion 340 is located at the top of the hemispherical portion 330. The stirring assembly includes a rotating shaft 410, a connecting portion 420 and a stirring portion. The rotating shaft 410 is rotatably connected to the frame through a bearing. The rotating shaft 410 includes a first end that is inserted into the straight tube portion 340 and is located in the second cavity 310; the middle part of the connecting portion 420 is sleeved on the first end and vertically connected to the rotating shaft 410, and the distance between the two ends of the connecting portion 420 is less than the diameter of the hemispherical portion 330; the stirring portion includes two stirring knives 430 respectively connected to the two ends of the connecting portion 420, so that the driven stirring knives 430 can rotate around the axis of the rotating shaft 410, and the two stirring knives 430 are centrally symmetrical and are both arc-shaped plates, and a gap is provided between the arc-shaped plate and the inner wall of the second hopper.

[0053] Among them, the two stirring blades 430 are symmetrical about the middle center of the connecting part 420, and the two stirring blades 430 are preferably arc-shaped plates. In this embodiment, it is preferred that the projections of the two arc-shaped plates in a horizontal state are both a quarter of a full circle. The two arc-shaped plates and the connecting part 420 are an integrated structure arranged in the same plane. Through the smaller gap between the arc-shaped plate and the hemispherical part 330, the arc-shaped plate can reduce or even avoid the adhesion of materials at the bottom of the hemispherical part 330, and the distance between the two arc-shaped plates at the ends farther from the connecting part 420 in the extension direction of the rotating shaft 410 is greater than the distance between the discharge port 320 in the extension direction of the rotating shaft 410, which can effectively solve the bridging phenomenon caused by materials with poor fluidity, and thus can adapt to the metering and transportation of more types of materials with poor fluidity.

[0054] Preferably, it also includes a motor 600 arranged above the weighing unit 120, the output end of the motor 600 is provided with a first gear 610 and a second gear 620 spaced apart, the rotating shaft 410 is provided with a third gear 411 meshing with the first gear 610, and the transmission assembly also includes two rotating shafts 510 respectively connected to the two screw rods 500, and the rotating shafts 510 are each provided with a fourth gear 520 meshing with the second gear 620, so that the rotating shaft 410 and the rotating shaft 510 driven by the motor 600 can rotate.

[0055] The motor 600 drives the first gear 610 to rotate, and drives the rotating shaft 410 to rotate, so that the connecting part 420 connected to the rotating shaft 410 drives the above-mentioned arc plate to rotate around the axis of the rotating shaft 410. The arc plate can break up the material accumulated at the discharge port 320, making it easier for the material to fall from the discharge port 320 into the conveying channel of the twin screw 500, thereby effectively improving the material conveying efficiency.

[0056] The first gear 610 and the second gear 620 rotate coaxially. When the rotating shaft 410 rotates, the second gear 620 drives the rotating shaft 510 connected to the screw 500 to rotate, so as to drive the two screws 500 to rotate in the same direction respectively, which is used for material transportation. The materials adhered to the screws 500 are forced to be wiped off naturally through the mutual engagement between the screws 500, which has a self-cleaning function and avoids material adhesion.

[0057] Please refer to FIG. 4 , preferably, a filter screen 700 with a containing space is provided at one end of the screw 500 away from the rotating shaft 510 for material accumulation, that is, the filter screen 700 is located inside the discharge port 110, and the filter screen 700 simultaneously limits the discharge of materials from the ends of the two screws 500. When the containing space of the filter screen 700 is full of materials, the materials are discharged to the discharge port 110 along the filter screen 700. The filter hole size of the filter screen 700 is preferably 2 mm×2 mm, and the filter screen 700 has a buffering and accumulation effect on the conveyed materials, so that the materials are discharged after being accumulated to a certain amount, which can ensure the accurate flow rate of the materials.

[0058] In this embodiment, the gap between the screw 500 and the conveying channel on which the screw 500 is installed is small, which can ensure that the tiny material quickly fills the entire conveying pipeline and reduce the metering deviation. The distance between the axes of the two screws 500 is preferably 17mm-18mm, and the spacing between adjacent threads on the same screw 500 is preferably 10mm. The distance between the thread and the adjacent screw 500 is preferably 0.08-0.1mm. The screw 500 with a small gap, fine thread and small pitch can ensure that materials with poor fluidity can be smoothly filled into the conveying channel, thereby ensuring continuous and stable output of materials and achieving accurate metering of small flow rates.

[0059] The distance between the axes of the two screw rods 500, the spacing between adjacent threads on the same screw rod 500, and the distance between a thread and adjacent screw rods 500 can be adjusted according to actual conditions as long as the above purpose can be achieved.

[0060] Preferably, a reinforcement member 220 is provided between the first hopper 200 and the second hopper, and the reinforcement member 220 is connected to the partial periphery of the first hopper 200 and the second hopper to achieve stability of the connection between the first hopper 200 and the second hopper, and a cover plate 230 is provided on the top of the first hopper 200 to seal the first cavity 210. When materials need to be put in, the cover plate 230 is opened, and when the materials are placed, the cover plate 230 is closed to prevent the materials stirred by the stirring blade 430 from escaping along the top of the first cavity 210. The weighing unit 120 is also provided with a housing 130, and the motor 600 is located inside the housing 130, and the rotating shaft 410 is connected to the housing 130 through a bearing to achieve support for the rotating shaft 410.

[0061] In addition, the first hopper 200, the second hopper, the screw 500 and the stirring assembly are all made of 316L stainless steel to achieve safe material transportation. The specific materials of the first hopper 200, the second hopper, the screw 500 and the stirring assembly can be adjusted according to actual conditions as long as the above purpose can be achieved. Support legs 140 are provided around the bottom of the frame, and the support legs 140 are provided with shock-absorbing feet 150 to avoid inaccurate weighing caused by vibration.

[0062] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A small flow loss-in-weight feeder, characterized in that: include: A frame body, provided with a material discharge port (110) and a weighing unit (120); A first hopper (200) provided with a first cavity (210) for placing materials; A second hopper is connected to the bottom of the first hopper (200) and is provided with a second cavity (310) connected to the first cavity (210); the second hopper is connected to the frame through a stirring assembly so that the material stirred by the stirring assembly is discharged along a discharge port (320) at the bottom of the second hopper; A transmission assembly is located at the bottom of the discharge port (320), and the transmission assembly comprises two adjacent screw rods (500) whose axes are parallel to each other, and the two screw rods (500) are provided with mutually meshing threads to drive the material passing through the discharge port (320) to be discharged to the discharge port (110).

2. The small flow loss-in-weight feeder according to claim 1, characterized in that: The second hopper comprises a hemispherical portion (330) and a straight cylindrical portion (340) tangentially connected to the hemispherical portion (330), and the straight cylindrical portion (340) is located at the top of the hemispherical portion (330). The stirring assembly comprises: A rotating shaft (410) is rotatably connected to the frame body via a bearing, the rotating shaft (410) comprising a first end passing through the straight tube portion (340), and the first end is located in the second cavity (310); A connecting portion (420), the middle portion of which is sleeved on the first end and vertically connected to the rotating shaft (410), and the distance between the two ends of the connecting portion (420) is smaller than the diameter of the hemispherical portion (330); The stirring portion comprises two stirring knives (430) respectively connected to the two ends of the connecting portion (420), so that the driven stirring knives (430) can rotate around the axis of the rotating shaft (410).

3. The small flow loss-in-weight feeder according to claim 2, characterized in that: The two stirring blades (430) are centrally symmetrical and are both arc-shaped plates, and a gap is provided between the arc-shaped plates and the inner wall of the second hopper.

4. The small flow loss-in-weight feeder according to claim 2, characterized in that: The invention also includes a motor (600) disposed above the weighing unit (120), wherein the output end of the motor (600) is provided with a first gear (610) and a second gear (620) spaced apart from each other, and the rotating shaft (410) is provided with a third gear (411) meshing with the first gear (610), and the transmission assembly also includes two rotating shafts (510) respectively connected to the two screw rods (500), and the rotating shafts (510) are each provided with a fourth gear (520) meshing with the second gear (620), so that the rotating shaft (410) and the rotating shaft (510) driven by the motor (600) rotate.

5. The small flow loss-in-weight feeder according to claim 4, characterized in that: A filter screen (700) having a receiving space is provided at one end of the screw rod (500) away from the rotating shaft (510) for accumulating materials. When the receiving space of the filter screen (700) is filled with materials, the materials are discharged along the filter screen (700) to the discharge port (110).

6. The small flow loss-in-weight feeder according to claim 1, characterized in that: The distance between the axes of the two screw rods (500) is 17 mm-18 mm, the spacing between adjacent threads on the screw rod (500) is 10 mm, and the distance between the thread and the adjacent screw rod (500) is 0.08-0.1 mm.

7. The small flow loss-in-weight feeder according to claim 1, characterized in that: A reinforcement member (220) is provided between the first hopper (200) and the second hopper, and a cover plate (230) is provided on the top of the first hopper (200) to seal the first cavity (210).

8. The small flow loss-in-weight feeder according to claim 4, characterized in that: The weighing unit (120) is also provided with a housing (130), and the motor (600) is located inside the housing (130).

9. The small flow loss-in-weight feeder according to claim 1, characterized in that: The first hopper (200), the second hopper, the screw (500) and the stirring assembly are all made of 316L stainless steel.

10. The small flow loss-in-weight feeder according to any one of claims 1 to 9, characterized in that: Support legs (140) are provided around the bottom of the frame, and the support legs (140) are provided with shock-absorbing feet (150).

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