CN220794388U - Air locking feeding scale with double weighing modules - Google Patents

Abstract

The utility model relates to the technical field of metering and weighing equipment. The technical proposal is as follows: the air locking feeding balance with double weighing modules comprises a balance frame, a balance body, a first supporting component, a second supporting component and a third supporting component, wherein a rotor is arranged in the balance body for conveying materials, and the first supporting component, the second supporting component and the third supporting component are connected between the balance frame and the balance body; the top of the balance body is provided with a feed inlet, and the bottom of the balance body is provided with a discharge outlet; the method is characterized in that: a feeding pipe is vertically arranged at the feeding hole; a first weighing sensor is arranged in the first supporting structure; the second supporting component and the third supporting component are respectively arranged at two sides of the balance body, wherein the second supporting component is arranged at one side close to the feed inlet, and the third supporting component is arranged at one side close to the discharge outlet; a second load cell is disposed in the second support assembly to detect the weight of material in the feed tube. This lock wind feed balance should compromise measurement and lock wind function to can dry the material, prevent that the material from piling up.

Description

Air locking feeding scale with double weighing modules

Technical Field

The utility model relates to the technical field of metering weighing equipment, in particular to a wind locking feeding scale with double weighing modules.

Background

The vertical mill is an ideal large-scale grinding device, is widely applied to industries such as cement, electric power, metallurgy, chemical industry, nonmetallic ore and the like, and can grind massive and granular materials into required powdery materials. Because the inside of the vertical mill is required to be in a negative pressure state during operation, the feeder of the vertical mill needs to meet strict air locking requirements during feeding, namely, external air cannot enter the mill, and once the external air enters the mill, the energy consumption of the system is increased.

The traditional air locking feeder adopts a horizontal rotary discharger (a dividing wheel), and the main structure of the traditional air locking feeder consists of a shell, a driving shaft and dividing blades. The air locking grid wheel discharger drives the grid wheel blades to rotate by a driving shaft arranged in the horizontal direction, and materials are discharged from a discharge hole under the rotation action of the grid wheel after entering the grid wheel from a feed hole, so that clinker and ore raw materials are sent into grinding equipment. However, most of the using effects are not ideal enough, and particularly for a material wetting production line, a large amount of materials are accumulated in each grid of the grid wheel during severe conditions, so that the feeding of the vertical mill is difficult, the vertical mill is stopped frequently, and the operation of the vertical mill is seriously affected. Moreover, because the clearance control is not strict, the blades and the cylinder are always in a wearing state, after the blades and the cylinder are worn in use, the air leakage quantity is large, and the leaked air can directly increase the load of a circulating fan of the grinding system.

In addition, in order to accurately control the amount of material entering the mill, so that the grinding capacity of the mill and the amount of material entering the mill are optimally matched, the maximum working efficiency of the mill is exerted, and the material entering the mill needs to be measured. At present, the current state of the industry is to use a large amount of belt scales for metering, but the belt scales have the defect of low metering precision.

Chinese patent CN212721683U discloses a rotor scale which can be used for metering bulk materials. The rotor balance comprises a metering bin and a driving mechanism, wherein the metering bin comprises a metering bin cylinder body, a metering bin upper plate and a metering bin lower plate, and a metering bin chamber is formed by enclosing the metering bin cylinder body, the metering bin upper plate and the metering bin lower plate; the driving mechanism comprises a rotor and a driving shaft, the rotor comprises a rotor matrix, a rotor outer ring and a plurality of rotor blades, the rotor matrix is fixedly sleeved on the driving shaft, the rotor outer ring is coaxially arranged at the periphery of the rotor matrix, and the plurality of rotor blades are connected between the rotor matrix and the rotor outer ring in a surrounding mode at intervals; the distance between the rotor blade and the upper plate of the metering bin is 1/2-2/3 of the distance between the upper plate of the metering bin and the lower plate of the metering bin. The rotor balance disclosed by the patent is uniform and stable in feeding and high in feeding precision, but does not have an air locking function, and needs to be improved.

Disclosure of Invention

The utility model aims to overcome the defects of the background technology, and provides the air locking feeding scale with the double weighing modules, which has the metering and air locking functions, so that the mill can exert the maximum working efficiency while saving energy, and can dry materials and prevent the materials from accumulating.

The technical scheme provided by the utility model is as follows:

the air locking feeding balance with double weighing modules comprises a balance frame, a balance body, a first supporting component, a second supporting component and a third supporting component, wherein a rotor is arranged in the balance body for conveying materials, and the first supporting component, the second supporting component and the third supporting component are connected between the balance frame and the balance body; the top of the balance body is provided with a feed inlet, and the bottom of the balance body is provided with a discharge outlet; the method is characterized in that:

a feeding pipe is vertically arranged at the feeding hole; a first weighing sensor is arranged in the first supporting structure so as to detect the weight of materials conveyed in the balance body; the first weighing sensor is positioned on the middle line of the arc-shaped interval from the feed inlet to the discharge outlet; the second supporting component and the third supporting component are respectively arranged at two sides of the balance body, wherein the second supporting component is arranged at one side close to the feed inlet, and the third supporting component is arranged at one side close to the discharge outlet; a second load cell is disposed in the second support assembly to detect the weight of material in the feed tube.

The balance body comprises a cylinder body which is vertically arranged and is opened up and down, a top plate which is horizontally arranged on the upper part of the cylinder body and is provided with the feed inlet, and a bottom plate which is horizontally arranged on the lower part of the cylinder body and is provided with the discharge outlet; the top plate and the bottom plate are fixedly connected through a plurality of screws.

The rotor comprises a driving shaft vertically arranged in the center of the balance body, a rotor matrix fixed on the driving shaft, a rotor outer ring sleeved on the periphery of the rotor matrix, and a plurality of rotor blades with one end uniformly fixed on the periphery of the rotor matrix and the other end fixedly connected with the rotor outer ring; an annular gap is formed between the rotor outer ring and the cylinder body so as to form a first interlayer; a first drying pipe is connected to the side wall of the cylinder body so as to blow a drying air flow into the first interlayer; a gap exists between the top of the rotor outer ring and the top plate, so that the drying air flow of the first interlayer flows into the balance body.

The feeding pipe comprises an inner pipe and an outer pipe sleeved on the periphery of the inner pipe; an annular gap is formed between the inner tube and the outer tube to form a second interlayer; sealing plates for sealing are respectively arranged on the upper part and the lower part of the second interlayer; the side wall of the outer tube is connected with a second drying tube so as to blow a drying air flow into the second interlayer; an air inlet pipe is connected between the outer pipe and the top plate so that the drying air flow of the second interlayer flows into the balance body.

The arc interval angle from the feed inlet to the discharge outlet of the material in the balance body is 240 degrees.

The first supporting component comprises a first weighing sensor fixed on the scale frame, a screw rod vertically penetrating through the first weighing sensor, a limit nut arranged at the upper end of the screw rod in a threaded manner so as to limit the vertical position of the screw rod, a Y-shaped connector fixed at the lower end of the screw rod, a middle connector rotationally connected with the Y-shaped connector through a horizontal pin shaft, and a hanging lug seat fixed on the bottom plate of the scale body and capable of applying force to the middle connector downwards; the hanger seat and the middle connector can be connected in a swinging way around a horizontal axis.

A knife edge is fixed on the intermediate connector; a knife edge seat positioned above the knife edge is fixed on the hanging lug seat; the top of the knife edge is provided with a V-shaped bulge; the bottom of the knife edge seat is provided with a V-shaped groove which is in propping connection with the V-shaped bulge; the swinging axis of the knife edge and the knife edge seat is perpendicular to the axis of the horizontal pin shaft.

The second supporting component comprises a second weighing sensor fixedly connected with the top plate of the scale body, a first thimble fixed on the scale frame through a thimble link plate, and a first top sleeve fixedly connected with the second weighing sensor through a sensor link plate; the top of the first thimble is provided with a first conical bulge; the bottom of the first top sleeve is provided with a first conical groove; the first conical protrusion is in propping connection with the first conical groove, so that point contact is formed between the first thimble and the first thimble.

The third supporting component comprises a second ejector pin fixedly connected with the scale frame and a second ejector sleeve fixedly connected with the top plate of the scale body; the top of the second thimble is provided with a second conical bulge; the bottom of the second top sleeve is provided with a second conical groove; the second conical protrusion is in propping connection with the second conical groove, so that point contact is formed between the second thimble and the second thimble.

The projections of the feeding hole, the discharging hole, the contact point of the first thimble and the first top sleeve and the projection of the contact point of the second thimble and the second top sleeve on the horizontal plane are all positioned on the same straight line.

The beneficial effects of the utility model are as follows:

(1) The three-point supporting mode is adopted between the balance body and the balance frame, wherein the first supporting structure and the second supporting structure are respectively provided with a weighing sensor; the first weighing sensor is used for measuring the weight of the materials in the balance body and metering the conveyed materials; the second weighing sensor is used for measuring the weight of materials in the feeding pipe, and the material locking wind is realized by controlling the material level height in the feeding pipe, so that the metering and wind locking functions are considered.

(2) The feeding pipe and the balance body are respectively provided with the interlayer, and the first drying pipe and the second drying pipe can blow drying air flow into the interlayer and flow into the balance body to dry materials, so that the wet materials are prevented from being adhered in the balance body, and the material conveying efficiency and the metering precision are improved.

(3) The material in the balance body rotates to the arc interval angle of the discharge port from the feed inlet and is 240 degrees, so that the conveying path of the material in the balance body is increased, the material locking effect is improved, the material can be effectively stabilized, and the metering error is reduced.

(4) The utility model improves the existing rotor balance, can meter and control the materials entering the mill, has the function of locking air, saves energy of the mill, exerts the maximum working efficiency, reduces the production cost and is suitable for popularization and use.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic diagram of a front view structure of the present utility model.

Fig. 3 is a schematic left-view structure of the present utility model.

Fig. 4 is a schematic top view of the present utility model.

Fig. 5 is a cross-sectional view A-A of fig. 4.

Fig. 6 is a schematic perspective view of a scale body.

Fig. 7 is a schematic view of a rotor mounted in a balance body.

Fig. 8 is a schematic perspective view of the first support assembly.

Fig. 9 is a schematic diagram of a cooperation structure of a knife edge and a knife edge seat.

Fig. 10 is a schematic perspective view of a second support assembly.

Reference numerals:

1. a scale rack;

2. a scale body; 2-1, a cylinder; 2-2, a top plate; 2-3, a bottom plate; 2-4, a feed inlet; 2-5, a discharge hole; 2-6, a screw rod; 2-7, an overhaul port; 2-8, a first drying tube;

3. a rotor; 3-1, driving shaft; 3-2, a rotor matrix; 3-3, rotor outer ring; 3-4, rotor blades; 3-5, a first interlayer;

4. a feed pipe; 4-1, an inner tube; 4-2, an outer tube; 4-3, sealing plate; 4-4, a second interlayer; 4-5, entering a balance wind pipe; 4-6, a second drying tube;

5. a first support assembly; 5-1, a first weighing sensor; 5-2, a screw rod; 5-3, limiting nuts; 5-4, Y-type joints; 5-5, an intermediate connector; 5-6, hanging ear seats; 5-7, knife edge; 5-8, a knife edge seat; 5-9, V-shaped bulges; 5-10, V-shaped grooves; 5-11, horizontal pin shafts;

6. a second support assembly; 6-1, a second weighing sensor; 6-2, a sensor link plate; 6-3, a second top sleeve; 6-4, a thimble link plate; 6-5, a first thimble; 6-6, a first conical protrusion; 6-7, a first conical groove;

7. a third support assembly; 7-1, a second top sleeve; 7-2, a second thimble; 7-3, a second conical groove; 7-4, second conical bulge.

Detailed Description

Further description will be given below of embodiments shown in the drawings.

The air locking feeding balance with double weighing modules as shown in fig. 1 is an improvement on the existing rotor balance (see Chinese patent CN 212721683U), on one hand, the conveyed materials can be weighed and measured, so that the amount of the materials entering a mill can be accurately controlled, the grinding capacity of the mill and the amount of the materials entering the mill can be optimally matched, and the maximum working efficiency of the mill can be exerted; on the other hand is provided with the inlet pipe at the feed inlet, keeps at certain height throughout through the material level of control inlet pipe, carries out material lock wind, compromise measurement and lock wind function.

As shown in fig. 1 to 4, the airlock feeder scale comprises a scale rack 1, a scale body 2, a rotor 3, a feed pipe 4, a first support assembly 5, a second support assembly 6 and a third support assembly 7. The first supporting component, the second supporting component and the third supporting component are respectively connected between the scale frame and the scale body to support the scale body at three points.

As shown in fig. 6, the scale body comprises a cylinder 2-1, a top plate 2-2 and a bottom plate 2-3; the axis of the cylinder body is vertically arranged, and the upper part and the lower part of the cylinder body are both arranged to be open; the top plate is horizontally arranged at the upper part of the cylinder body and provided with a feed inlet 2-4; the bottom plate is horizontally arranged at the lower part of the cylinder body, and a discharge port 2-5 is formed. The top plate and the bottom plate are fixedly connected through a plurality of screws 2-6, wherein the screws vertically penetrate through the edges of the top plate and the bottom plate, and the upper end and the lower end of each screw are screwed with the top plate and the bottom plate through nuts respectively, so that the top plate, the cylinder body and the bottom plate are connected into a whole. In this embodiment, the material in the balance body is rotated to the arc interval angle of discharge gate by the feed inlet and is 240, compares with current rotor balance, has increased the conveying path of material in the balance body, can improve the lock material effect, stabilizes the material effectively, reduces the measurement error. And the top plate is also provided with an overhaul port 2-7 so as to facilitate the observation and overhaul of the inside of the balance body.

As shown in fig. 7, a rotor is arranged in the balance body and is used for conveying materials; the rotor comprises a drive shaft 3-1, a rotor base 3-2, a rotor outer ring 3-3 and a number of rotor blades 3-4. The driving shaft is vertically arranged in the center of the balance body, wherein the upper end of the driving shaft penetrates through the top plate to be connected with an external driving motor (not shown in the figure), and the lower end of the driving shaft is rotatably arranged on the bottom plate through a bearing piece. The rotor matrix is fixed on the driving shaft; the rotor outer ring is sleeved on the periphery of the rotor matrix; one end of each rotor blade is uniformly fixed on the periphery of the rotor base, and the other end is fixedly connected with the outer ring of the rotor. An annular gap is formed between the rotor outer ring and the cylinder body to form a first interlayer 3-5. The side wall of the cylinder is connected with a first drying pipe 2-8 through which a drying air flow can be blown into the first interlayer. A gap exists between the top of the rotor outer ring and the top plate, so that the drying air flow of the first interlayer flows into the balance body.

As shown in FIG. 5, the feeding pipe is vertically arranged at the feeding hole, and during discharging, materials enter the scale body through the feeding pipe, and are accumulated in the feeding pipe, so that the materials in the feeding pipe are kept at a certain material level, and the material air locking effect can be realized. The feed pipe comprises an inner pipe 4-1 and an outer pipe 4-2; the outer pipe is sleeved on the periphery of the inner pipe, and an annular gap is formed between the outer pipe and the inner pipe to form a second interlayer 4-4; sealing plates 4-3 are fixed on the upper part and the lower part of the second interlayer, and the second interlayer is sealed. The side wall of the outer tube is connected with a second drying tube 4-6, and drying air flow can be blown into the second interlayer. And a weighing air inlet pipe 4-5 is connected between the feeding pipe and the top of the weighing body, wherein one end of the weighing air inlet pipe is connected with the side wall of the outer pipe, the other end of the weighing air inlet pipe is connected with the top plate, and the second interlayer can be communicated with the inside of the weighing body through the weighing air inlet pipe so that the drying air flow of the second interlayer flows into the inside of the weighing body.

During operation, blow in the stoving air current to first stoving pipe and second stoving pipe, when the stoving air current passes through first intermediate layer or second intermediate layer, can dry the material of inlet pipe inner wall or barrel inner wall department, afterwards the stoving air current flow direction balance body inside of first intermediate layer or second intermediate layer to dry the material in the inside transport of balance body, greatly reduced the moisture in the material, avoid moist material to bond in the balance body, and then improve material conveying efficiency and measurement accuracy.

As shown in fig. 8, the first support assembly includes a first load cell 5-1, a screw rod 5-2, a limit nut 5-3, a Y-joint 5-4, an intermediate connector 5-5, and a hanger bracket 5-6. The first weighing sensor is fixed on the scale frame and is positioned on the middle line of the arc-shaped interval from the feed inlet to the discharge outlet. The screw rod vertically penetrates through the first weighing sensor, the limit nut is installed at the upper end of the screw rod in a threaded mode, and the Y-shaped connector is fixedly connected to the lower end of the screw rod. The middle connector is rotatably connected with the Y-shaped joint through a horizontal pin shaft 5-11. The hanger seat is fixed on the bottom plate of the balance body and can downwards apply force to the middle connector. The specific connection mode between the hanger seat and the intermediate connector is as follows:

the intermediate connector is fixedly provided with a knife edge 5-7; the hanger seat is fixedly provided with a knife edge seat 5-8, and the knife edge seat is positioned above the knife edge. As shown in fig. 9, the top of the knife edge is provided with V-shaped bulges 5-9; the bottom of the knife edge seat is provided with a V-shaped groove 5-10; the V-shaped bulge can be in propping connection with the V-shaped groove, so that line contact is formed between the knife edge and the knife edge seat, and the knife edge seat can swing relatively around the contact line. The swinging axis of the knife edge and the knife edge seat is perpendicular to the axis of the horizontal pin shaft, so that the first supporting component has two degrees of freedom of rotation on the horizontal plane. When vibrations about taking place for the balance body, owing to the rotatory degree of freedom between intermediate connector and the Y type structure and the rotatory degree of freedom between intermediate connector and the hangers seat for the lead screw still can keep vertical state, can not give the weighing sensor of top with the ascending power transmission of incline direction that vibrations caused, thereby further improvement measurement precision.

When the first supporting component is installed, the vertical position of the screw rod is adjusted to enable the knife edge to be in propping connection with the knife edge seat, then the limiting nut is screwed, the lower end face of the limiting nut is in tight contact with the upper end face of the first weighing sensor, and the vertical position of the screw rod is limited. When the materials in the balance body are close to the first supporting component, the balance body can incline to one side of the first supporting component, the hanging lug seat drives the knife edge seat to apply downward pulling force to the knife edge, and the pulling force is transmitted to the first weighing sensor through the middle connector, the Y-shaped connector and the screw rod in sequence, so that the weight of the materials in the balance body is detected by the first weighing sensor.

As shown in fig. 1, the second supporting component and the third supporting component are respectively arranged at two sides of the balance body, wherein the second supporting component is arranged at one side close to the feed inlet, and the third supporting component is arranged at one side close to the discharge outlet.

As shown in fig. 10, the second supporting assembly includes a second load cell 6-1, a sensor link plate 6-2, a first top cover 6-3, a top pin link plate 6-4, and a first top pin 6-5. The second weighing sensor is fixedly connected with the top plate of the scale body; the sensor link plate is fixedly connected with a second weighing sensor; the top of the first top sleeve is fixedly connected with the sensor connecting plate, and a first conical groove 6-7 is formed in the bottom of the first top sleeve; the thimble link plate is fixed on the scale frame; the bottom of the first thimble is fixedly connected with the thimble link plate, and a first conical bulge 6-6 is arranged at the top of the first thimble; the first conical protrusion is in propping connection with the first conical groove, so that point contact is formed between the first thimble and the first thimble.

As shown in fig. 5, the third supporting assembly comprises a second top cover 7-1 and a second thimble 7-2; the second top sleeve and the second top sleeve have the same structure, and the second thimble have the same structure. Specifically, the top of the second top sleeve is fixedly connected with the top plate of the scale body, and a second conical groove 7-3 is formed in the bottom of the second top sleeve. The bottom of the second thimble is fixedly connected with the scale frame, and the top of the second thimble is provided with a second conical bulge 7-4; the second conical protrusion is in propping connection with the second conical groove, so that point contact is formed between the second thimble and the second thimble.

And projections of the feed inlet, the discharge outlet, the contact point of the first thimble and the first top sleeve and the contact point of the second thimble and the second top sleeve on a horizontal plane are positioned on the same straight line. In the second supporting component and the third supporting component, the two sides of the balance body are in point contact, so that a straight line is formed by the two contact points, and the plurality of degrees of freedom of the balance body are well limited by the supporting mode, so that only one degree of freedom of rotation of the balance body around the straight line is left.

The air locking feeding balance also comprises a controller (not shown in the figure, a PLC controller or a singlechip can be adopted); the controller is electrically connected to the first load cell, the second load cell, and a drive motor (not shown), respectively.

The working principle of the utility model is as follows:

during operation, in the process that the material in the balance body rotates from the feed inlet to the discharge outlet, the weight of one side close to the first supporting component can be obviously increased, and the increased weight is the weight of the material and can be detected by the first weighing sensor. Since the rotation speed of the rotor is known, the time between the material inlet and the material outlet is also known, and the total weight of the material passing through the metering bin in a certain time period can be obtained by integrating the weight of the material through the time. In addition, the material gets into the scale body inside from the inlet pipe, and wherein the material weight in the inlet pipe can be detected by second weighing sensor to with the signal feedback to the controller, the controller is according to the weight signal that second weighing sensor transmitted, adjusts rotor rotational speed, makes the material level in the inlet pipe remain at a take the altitude all the time, carries out the material lock wind. The air locking feeding scale has the advantages of metering and air locking effects, energy conservation, maximum working efficiency of the mill, production cost reduction, and suitability for popularization and application. In addition, through first drying tube and second drying tube can blow in the stoving air current to first intermediate layer and second intermediate layer, dry the material, avoid moist material to bond in the balance body, improve the conveying efficiency and the measurement precision of lock wind feed balance.

Finally, it should be noted that the above list is only specific embodiments of the present utility model. Obviously, the utility model is not limited to the above embodiments, but many variations are possible. All modifications directly derived or suggested to one skilled in the art from the present disclosure should be considered as being within the scope of the present utility model.

Claims (10)

1. The air locking feeding balance with the double weighing modules comprises a balance frame (1), a balance body (2) internally provided with a rotor (3) for conveying materials, and a first supporting component (5), a second supporting component (6) and a third supporting component (7) which are connected between the balance frame and the balance body; the top of the balance body is provided with a feed inlet (2-4), and the bottom of the balance body is provided with a discharge outlet (2-5); the method is characterized in that:

a feeding pipe (4) is vertically arranged at the feeding hole; a first weighing sensor (5-1) is arranged in the first supporting component so as to detect the weight of materials conveyed in the balance body; the first weighing sensor is positioned on the middle line of the arc-shaped interval from the feed inlet to the discharge outlet; the second supporting component and the third supporting component are respectively arranged at two sides of the balance body, wherein the second supporting component is arranged at one side close to the feed inlet, and the third supporting component is arranged at one side close to the discharge outlet; a second load cell (6-1) is disposed in the second support assembly to sense the weight of material in the feed tube.

2. The dual weighing module airlock feed balance of claim 1, wherein: the balance body comprises a cylinder body (2-1) which is vertically arranged and is opened up and down, a top plate (2-2) which is horizontally arranged on the upper part of the cylinder body and is provided with a feed inlet (2-4), and a bottom plate (2-3) which is horizontally arranged on the lower part of the cylinder body and is provided with a discharge outlet (2-5); the top plate and the bottom plate are fixedly connected through a plurality of screws.

3. The dual weighing module airlock feed balance of claim 2, wherein: the rotor comprises a driving shaft (3-1) vertically arranged in the center of the balance body, a rotor matrix (3-2) fixed on the driving shaft, a rotor outer ring (3-3) sleeved on the periphery of the rotor matrix, and a plurality of rotor blades (3-4) with one end uniformly fixed on the periphery of the rotor matrix and the other end fixedly connected with the rotor outer ring; an annular gap is formed between the rotor outer ring and the cylinder body to form a first interlayer (3-5); the side wall of the cylinder is connected with a first drying pipe (2-8) so as to blow a drying air flow into the first interlayer; a gap exists between the top of the rotor outer ring and the top plate, so that the drying air flow of the first interlayer flows into the balance body.

4. The dual weighing module airlock feed balance of claim 2, wherein: the feeding pipe comprises an inner pipe (4-1) and an outer pipe (4-2) sleeved on the periphery of the inner pipe; an annular gap is formed between the inner tube and the outer tube to form a second interlayer (4-4); sealing plates (4-3) for sealing are respectively arranged on the upper part and the lower part of the second interlayer; the side wall of the outer tube is connected with a second drying tube (4-6) so as to blow a drying air flow into the second interlayer; an air inlet pipe (4-5) is connected between the outer pipe and the top plate so that the drying air flow of the second interlayer flows into the balance body.

5. The double weighing module airlock feed balance of claim 1 or 2, wherein: the arc interval angle from the feed inlet to the discharge outlet of the material in the balance body is 240 degrees.

6. The dual weighing module airlock feed balance of claim 1, wherein: the first supporting component comprises a first weighing sensor (5-1) fixed on the scale frame, a screw rod (5-2) vertically penetrating through the first weighing sensor, a limit nut (5-3) arranged at the upper end of the screw rod in a threaded manner so as to limit the vertical position of the screw rod, a Y-shaped connector (5-4) fixed at the lower end of the screw rod, a middle connector (5-5) rotationally connected with the Y-shaped connector through a horizontal pin shaft (5-11), and a hanging lug seat (5-6) fixed on the bottom plate of the scale body and capable of applying force to the middle connector downwards; the hanger seat and the middle connector can be connected in a swinging way around a horizontal axis.

7. The dual weighing module airlock feed balance of claim 6 wherein: a knife edge (5-7) is fixed on the intermediate connector; a knife edge seat (5-8) positioned above the knife edge is fixed on the hanging lug seat; the top of the knife edge is provided with a V-shaped bulge (5-9); the bottom of the knife edge seat is provided with a V-shaped groove (5-10) which is in propping connection with the V-shaped bulge; the swinging axis of the knife edge and the knife edge seat is perpendicular to the axis of the horizontal pin shaft.

8. The dual weighing module airlock feed balance of claim 1, wherein: the second supporting component comprises a second weighing sensor (6-1) fixedly connected with the top plate of the scale body, a first thimble (6-5) fixedly arranged on the scale frame through a thimble link plate (6-4), and a first top sleeve (6-3) fixedly connected with the second weighing sensor through a sensor link plate (6-2); the top of the first thimble is provided with a first conical bulge (6-6); the bottom of the first top sleeve is provided with a first conical groove (6-7); the first conical protrusion is in propping connection with the first conical groove, so that point contact is formed between the first thimble and the first thimble.

9. The dual weighing module airlock feed balance of claim 8, wherein: the third supporting component comprises a second thimble (7-2) fixedly connected with the scale frame and a second top sleeve (7-1) fixedly connected with the top plate of the scale body; the top of the second thimble is provided with a second conical bulge (7-4); the bottom of the second top sleeve is provided with a second conical groove (7-3); the second conical protrusion is in propping connection with the second conical groove, so that point contact is formed between the second thimble and the second thimble.

10. The dual weighing module airlock feed balance of claim 9, wherein: the projections of the feeding hole, the discharging hole, the contact point of the first thimble and the first top sleeve and the projection of the contact point of the second thimble and the second top sleeve on the horizontal plane are all positioned on the same straight line.