An automatic powder quantitative servo weighing and packaging machine and a feeding and weighing control method

Abstract

The present invention discloses an automatic powder quantitative servo weighing and packaging machine and a feeding and weighing control method, which relates to the field of servo weighing and packaging machines. In the present invention: a speed-adjusting hopper is fixedly installed on a supporting top plate, a servo motor is arranged on one side of the speed-adjusting hopper, a feeding electric control valve is arranged in the speed-adjusting hopper, and the servo motor is drivingly connected to the feeding electric control valve. A bag-clamping and feeding bin is arranged below the supporting top plate, and the supporting top plate is provided with a plurality of weighing unit components for sensing and detecting the downward acting force of the bag-clamping and feeding bin. A set of bag-clamping arms is arranged at both positions on both sides of the bag-clamping and feeding bin, a cylinder assembly is arranged between two bag-clamping arms in the same group, and mutually matching bag-clamping plates are arranged at the lower ends of the two bag-clamping arms in the same group. When the weighed weight meets the standard in the present invention, the weight of the material finally exceeding in the material bag is less, realizing continuous and highly accurate feeding and weighing control while ensuring the control of the loading rate.

Description

Technical Field

[0001] The present invention relates to the field of servo weighing and packaging machines, and particularly to an automatic powder quantitative servo weighing and packaging machine and a feeding and weighing control method. Background Art

[0002] In the modern market, people's requirements for product quality are increasing day by day, the market demand is constantly expanding, and enterprises' demand for automation is getting higher and higher. Manual weighing and packaging has a large labor intensity, low efficiency, and high cost. In such a situation, the research, design, and production of automatic quantitative servo weighing and packaging machines are imperative.

[0003] However, in the actual process of feeding, weighing, and packaging production, there is a phenomenon of falling error. This error is a significant error for quantitative automatic packaging scales. When the weight value in the weighing hopper reaches the set value, although the pneumatic vibrating feeder in the silo has stopped, at the moment of stopping, the weighed material in the section from the weighing hopper to the vibrator will finally fall into the packaging bag, resulting in the so-called falling error. Although some quantitative automatic packaging scales use a shorter feeding time to reduce the falling error, due to the influence of system uncertain factors such as flow rate and feeding uniformity, there are still errors to varying degrees.

[0004] In addition, traditional quantitative automatic packaging scales generally go through a weighing process of rough weighing and fine weighing. Especially in the process of fine weighing, it needs to be added bit by bit, which takes a long time and affects the feeding and weighing efficiency of the material. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an automatic powder quantitative servo weighing and packaging machine and a feeding and weighing control method, which achieve continuous and highly accurate feeding and weighing control while ensuring the control of the loading rate.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0007] The present invention provides an automatic powder quantitative servo weighing and packaging machine, including a fixed base frame, a support top plate located at the top of the fixed base frame. The support top plate is fixedly installed with a speed-adjusting hopper. A servo motor is arranged on one side of the speed-adjusting hopper. A feeding electric control valve is arranged in the speed-adjusting hopper, and the servo motor is drivingly connected to the feeding electric control valve. A bag-clamping and feeding bin is arranged below the support top plate. The support top plate is provided with a plurality of weighing unit components for sensing and detecting the downward acting force of the bag-clamping and feeding bin. A set of bag-clamping arms is arranged on each side of the bag-clamping and feeding bin. A cylinder assembly is arranged between the two bag-clamping arms in the same group. The lower ends of the two bag-clamping arms in the same group are provided with mutually cooperating bag-clamping plates. A controller is fixedly installed on one side of the fixed base frame. The controller is connected to the servo motor and the air supply mechanism of the cylinder assembly through an electrical control circuit, and the controller is connected to the weighing unit components through a signal line.

[0008] As a preferred technical solution of the servo weighing and packaging machine of the present invention: a feed pipe is provided at the top of the speed-regulating hopper, and a material buffer hopper extending into the upper opening position of the bag-clamping and blanking bin is provided at the bottom of the speed-regulating hopper. Among them, the material buffer hopper vertically penetrates and is fixedly installed on the support top plate.

[0009] As a preferred technical solution of the servo weighing and packaging machine of the present invention: the weighing unit assembly is configured with a weighing suspension rod that penetrates the support top plate downward, a horizontal panel is fixedly provided on the circumferential side of the bag-clamping and blanking bin, the lower end of the weighing suspension rod is fixedly connected to the edge position of the horizontal panel, and the upper end of the bag-clamping arm is movably connected to the edge position of the horizontal panel.

[0010] The present invention provides a feeding and weighing control method for a powder automatic quantitative servo weighing and packaging machine, including the following steps:

[0011] S1. The controller controls the cylinder assembly to open the bag-clamping arm and the bag-clamping plate, the material bag is sleeved at the lower opening position of the bag-clamping and blanking bin, and the controller controls the cylinder assembly to close the bag-clamping arm and the bag-clamping plate, and the material bag is clamped at the lower opening position of the bag-clamping and blanking bin.

[0012] S2. The weighing unit assembly performs no-load weighing and transmits and stores the weighed information to the controller, denoted as M O。

[0013] S3. The controller controls the feeding mechanism to start feeding, the material enters the speed-regulating hopper from the feed pipe, and the controller controls the servo motor to open the feeding electric control valve of the speed-regulating hopper.

[0014] S4. The control system of the controller presets the net weight of the material in a single material bag as M C , and the real-time weight information sensed and monitored by the weighing unit assembly is M X。

[0015] S5. When , the controller drives and controls the feeding rate of the speed-regulating hopper to be V B , where λ is the standard feeding rate reference coefficient, 0.8 < λ < 1, .

[0016] S6. When , the controller drives and controls the feeding rate of the speed-regulating hopper to be F(t), then: .

[0017] Among them, m and n are integers, m ≥ 2, n ≥ 2, , T is the feeding rate change period, T = 2π.

[0018] S7. When , then the controller drives and controls the speed-regulating hopper to stop feeding, and the controller controls the cylinder assembly to open the bag-clamping arm and the bag-clamping plate, and the fully loaded material bag falls.

[0019] As a preferred technical solution of the feeding and weighing control method of the present invention: a material quantity monitoring unit is arranged in the speed-adjustable hopper to monitor the total amount of materials accumulated in the speed-adjustable hopper. When the total amount of materials accumulated in the speed-adjustable hopper exceeds the maximum material accumulation amount preset by the controller system, the material conveying mechanism upstream of the feed pipe stops feeding the feed pipe.

[0020] As a preferred technical solution of the feeding and weighing control method of the present invention: in the discharging rate F(t) of the speed-adjustable hopper, , when the parameter value of A n reaches the lowest value preset by the controller system, A n+1 , A n+2 , A n+3 ,... all take the value of A n .

[0021] Compared with the existing technology, the beneficial effects of the present invention are:

[0022] In the present invention, the real-time material discharging rate is regulated by the speed-adjustable hopper. After the weighing unit assembly monitors that the weighing weight is close to the required total weight, the periodic discharging control of sinusoidal dynamic attenuation is started. For each "high amplitude" cycle of sinusoidal discharging rate control, multiple "low amplitude" cycles of sinusoidal discharging rate control are carried out subsequently. And as time goes by, the sinusoidal amplitude of the "high amplitude" cycle gradually decreases, and the sinusoidal of the "low amplitude" cycle synchronously attenuates with the decrease of the sinusoidal amplitude of the "high amplitude" cycle. When the weighed weight meets the standard, the final excess weight of the materials in the material bag is less, realizing continuous and highly accurate discharging and weighing control while ensuring the control of the loading rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the overall structural schematic diagram of the servo weighing and packaging machine in the present invention.

[0024] Figure 2 is the schematic diagram of the speed-adjustable hopper in the present invention.

[0025] Figure 3 is the schematic diagram of the change of the discharging rate during the discharging of the tail section of the servo weighing and packaging machine in the present invention.

[0026] Among them: 1 - fixed base frame; 2 - support top plate; 3 - speed-adjustable hopper, 301 - feed pipe, 302 - material buffer bin, 303 - discharging electric control valve, 304 - material quantity monitoring unit, 305 - baffle plate; 4 - servo motor; 5 - bag clamping and discharging bin, 501 - horizontal panel; 6 - weighing unit assembly, 601 - weighing suspension rod; 7 - bag clamping arm, 701 - cylinder assembly, 702 - bag clamping plate; 8 - controller. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Embodiment 1. The present invention relates to an automatic powder quantitative servo weighing and packaging machine, and its main structure is as follows:

[0029] Please refer to Figure 1 , a support top plate 2 is fixedly arranged on the top of the fixed base frame 1, a speed-adjusting hopper 3 is fixedly installed on the upper side of the support top plate 2, a feed pipe 301 is arranged at the top of the speed-adjusting hopper 3, and a servo motor 4 is arranged on one side of the speed-adjusting hopper 3.

[0030] The bag-clamping and blanking bin 5 is located below the support top plate 2, and a horizontal panel 501 is fixedly installed on the circumferential side of the bag-clamping and blanking bin 5. A material buffer bin 302 is arranged at the bottom of the speed-adjusting hopper 3, and the lower end of the material buffer bin 302 extends into the upper opening of the bag-clamping and blanking bin 5. The material buffer bin 302 vertically penetrates the support top plate 2, and the material buffer bin 302 is fixedly connected to the support top plate 2. The support top plate 2 is provided with a plurality of weighing unit components 6, and the plurality of weighing unit components 6 are used for sensing and detecting the downward acting force of the bag-clamping and blanking bin 5. The weighing unit component 6 is provided with a downwardly arranged weighing suspension rod 601. The weighing suspension rod 601 penetrates the support top plate 2, and the lower end of the weighing suspension rod 601 is fixedly connected to the edge position of the horizontal panel 501. When the weighing unit component 6 weighs, the measured weight includes not only the weight of the material bag and the material in the material bag, but also the weight of the bag-clamping and blanking bin 5.

[0031] A set of bag-clamping arms 7 are installed on both sides of the bag-clamping and blanking bin 5. The upper ends of the bag-clamping arms 7 are movably connected to the edge position of the horizontal panel 501. The cylinder assembly 701 is located between two bag-clamping arms 7 in the same group. The telescopic shaft rod of the cylinder assembly 701 performs telescopic movement to drive the two bag-clamping arms 7 in the same group to open and close. The lower ends of the two bag-clamping arms 7 in the same group are provided with mutually cooperating bag-clamping plates 702.

[0032] The controller 8 and the control box are fixedly installed on one side of the fixed base frame 1. The controller 8 is connected to the servo motor 4 and the air supply mechanism of the cylinder assembly 701 through an electrical control circuit to perform electrical control on the servo motor 4 and the air supply mechanism of the cylinder assembly 701. The controller 8 is connected to the weighing unit component 6 through a signal line to obtain the weight information measured by the weighing unit component 6.

[0033] Please refer to Figure 1 , Figure 2, a blanking electric control valve 303 is arranged in the speed-adjusting hopper 3, and the servo motor 4 is drivingly connected to the blanking electric control valve 303. The structure of linearly opening and closing the electric control valve by motor drive control is a relatively common technical method in the prior art field and will not be elaborated in the present invention. The baffle plate 305 can prevent the falling materials in the feed pipe 301 from interfering with the material quantity monitoring unit 304. The lower edge of the baffle plate 305 just aligns and cooperates with the horizontal detection azimuth of the material quantity monitoring unit 304. When the materials rise to the maximum material accumulation amount position, there will also be some materials blocking the horizontal monitoring area of the material quantity monitoring unit 304. Among them, the material quantity monitoring unit 304 only needs to monitor whether there is any blockage in the distance between it and the baffle plate 305.

[0034] Embodiment 2: The present invention relates to a feeding and weighing control method for a powder automatic quantitative servo weighing and packaging machine. The main control method steps are as follows:

[0035] First, the controller 8 drives and controls the cylinder assembly 701 to open the bag clamping arms 7 and the bag clamping plates 702. The material bag is sleeved at the lower side opening position of the bag clamping and blanking bin 5. The controller 8 drives and controls the cylinder assembly 701 to close the bag clamping arms 7 and the bag clamping plates 702, and the material bag is clamped at the lower side opening position of the bag clamping and blanking bin 5.

[0036] Then, the weighing unit assembly 6 conducts no-load weighing and transmits and stores the weighed information into the controller, denoted as M O .

[0037] The controller 8 controls the blanking mechanism to start blanking. The materials enter the speed-adjusting hopper 3 from the feed pipe 301, and the controller 8 controls the servo motor 4 to open the blanking electric control valve 303 of the speed-adjusting hopper 3.

[0038] Among them, the control system of the controller 8 presets the net weight M of the materials filled in a single material bag C , and the real-time weight information sensed and monitored by the weighing unit assembly 6 is denoted as M X .

[0039] Case 1: When , the controller 8 drives and controls the blanking rate of the speed-adjusting hopper 3 to be V B , where λ is the standard blanking rate reference coefficient, 0.8 < λ < 1, . The faster the blanking rate V B , the smaller the standard blanking rate reference coefficient λ. The net content M of the materials required to be filled in the material bag C + M OThe larger it is, the larger the reference coefficient λ of the standard blanking rate is, which can greatly reduce the probability of "overloading" the material bagging. In fact, when the blanking rate is large, the "time" to start decelerating the blanking is earlier. The larger the net content of the material to be blanked, the lower the proportion of the remaining unloaded material when decelerating blanking to the total amount of the material to be loaded.

[0040] Case 2: When , the controller 8 drives and controls the blanking rate of the speed-adjustable hopper 3 to be F(t). Combining Figure 3 , the periodic change law of F(t) is as follows: .

[0041] Among them, m and n are integers, m≥2, n≥2, , T is the blanking rate change period, T = 2π. In the present invention, in order to simplify the representation of the period range parameter range of the blanking rate F(t), the form of "[...,...)" is not adopted, but it does not affect the expression intention of the mathematical formula.

[0042] In the present invention, for each "high amplitude" period of the sine blanking rate change, m + 1 "low amplitude" periods of the sine blanking rate change are carried out subsequently. And as time goes by, the sine amplitude of the "high amplitude" period gradually decreases, and the sine of the "low amplitude" period decays synchronously with the decrease of the sine amplitude of the "high amplitude" period. In this way, the closer the total weight is to the total weight M of the filled material C , when the weight of the material bag reaches the standard, the probability that the material weight exceeds the standard less is higher, because there are fewer "high amplitude" periods and more "low amplitude" periods. And when the weight does not reach the standard for several consecutive "low amplitude" periods, if the "low amplitude" period is continued for blanking, it may still take a long time. Therefore, after m + 1 "low amplitude" periods of blanking and the weighing still does not reach the standard, the subsequent "high amplitude" period of blanking is switched once. The "high amplitude" period of blanking first has a larger blanking rate and then rapidly decreases. In this way, when the blanking rate is larger, the weight requirement has been met, and the subsequent blanking rate rapidly decreases to avoid excessive blanking. Through this way to "accelerate" the blanking amount, and then continue to use the subsequent "low amplitude" period for blanking, so as to complete the continuous and high-precision blanking weighing control while ensuring the control of the loading rate.

[0043] In the blanking rate F(t) of the speed-adjustable hopper 3: , when the parameter value of A n reaches the lowest value preset by the controller 8 system, A n+1 , A n+2 , A n+3 ,... all take the value of A n, this is mainly controlled by two reasons. One is the control accuracy of the blanking electric control valve 303, and the other is to avoid the situation where the weighing weight is almost reached at the end, resulting in an overly long continuous "fine" blanking time.

[0044] Situation three: When , the controller 8 drives and controls the speed-adjustable hopper 3 to stop blanking. The controller 8 drives and controls the cylinder assembly 701 to open the bag clamping arm 7 and the bag clamping plate 702, and the fully loaded bag drops, and then subsequent conveying and packing operations are carried out.

[0045] In the present invention, a material quantity monitoring unit 304 is provided in the speed-adjustable hopper 3 to monitor the total amount of materials accumulated in the speed-adjustable hopper 3. When the total amount of materials accumulated in the speed-adjustable hopper 3 exceeds the maximum material accumulation amount preset by the controller 8 system, the material conveying mechanism upstream of the feed pipe 301 stops feeding the feed pipe 301. When the total amount of materials accumulated in the speed-adjustable hopper 3 is lower than the maximum material accumulation amount preset by the controller 8 system, the material conveying mechanism upstream of the feed pipe 301 starts feeding the feed pipe 301.

[0046] Embodiment three: The automatic quantitative servo weighing and packaging machine of the present invention is a new generation intelligent packaging scale developed and manufactured by our company. The machine is mainly composed of an automatic weighing device, a conveying device, a controller 8 control, etc. It has the characteristics of reasonable structure, beautiful appearance, stable operation, energy saving and power saving, convenient operation, and accurate weighing. The main machine adopts adjustable-speed feeding and a special vibration buffer structure, advanced digital technology, sampling processing technology, anti-interference technology, and completes the production operation through a servo high-precision blanking and weighing control method.

[0047] In the equipment of the present invention, the weighing unit assembly 6 uses high-stability and high-precision weighing sensors and weighing modules. The weighing sensors adopt METTLER TOLEDO weighing sensors, with high weighing accuracy and fast speed.

[0048] The controller 8 and the control box can be installed with a screen interface that is simple to operate and intuitive to display. For example, an independent packaging weight input and weighing weight display window are set on the screen interface, and the display window uses a high-brightness LED display. The menu operation is designed based on the basic principles of simplicity, intuitiveness, and friendliness. The Chinese touch screen display is intuitive and simple to operate. The PLC computer control system runs more stably, can adjust any parameters without stopping the machine. In addition, the control system can store multiple groups of parameters, making it more effective to change varieties.

[0049] In addition, in order to reduce the equipment cost and complexity to a certain extent, the method of manual assistance for bag loading and pneumatic bag clamping can be adopted.

[0050] In the equipment of the present invention, a servo motor 4 is used to control blanking, adjust the speed, measure and control the blanking, with high control accuracy. Except for the servo motor 4, the cylinder assembly 701, electrical accessories, and pneumatic components, the whole machine of the present invention is made of stainless steel.

[0051] The fully automatic packaging and weighing system of the present invention is suitable for the automatic packaging of various packaging bags, such as paper bags, plastic bags, woven bags, etc. Its products are widely used in the fully automated process of weighing, packaging detection and palletizing of granular materials, powdery materials, block materials, liquids, etc. in many industries such as petrochemicals, fertilizers, grains, feeds, building materials, metallurgy, ports, logistics, etc.

[0052] The packaging speed of the equipment of the present invention is: 100-300 packs / hour, 300-600 packs / hour, 600-1200 packs / hour, the packaging accuracy of the equipment of the present invention is: 0.2%, and the packaging weight of the present invention is: 10-50kg.

[0053] This machine integrates automatic weighing, compact structure and reasonable structure. It has a novel and beautiful appearance, low noise, low energy consumption and easy operation, which improves production efficiency, reduces the labor intensity of workers and improves the working environment. The material buffer silo 302, the material is sent to the material bag through the servo-controlled feeding. The feeding amount is controlled by controlling the speed of the servo motor 4 and the opening and closing size of the unloading electric control valve 303 in the speed regulating hopper 3. Once the set weight is reached, its bag clamping arm 7 is opened through the control system, and the material bag falls automatically. The entire weighing process is controlled by the controller and sealed manually.

[0054] The packaging machine is used for quantitative packaging of granular materials in industries such as grain, rice, seed corn, soybean, paddy, fertilizer granules, rubber granules, plastic granules, PP granules, PE granules, inorganic salts, industrial salts, metal granules, oils, sugar, food granules, chemical industry, light industry, etc. The packaging scale is made of stainless steel.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A feeding and weighing control method for an automatic powder quantitative servo weighing and packaging machine, characterized in that: The implementation of this control method relies on an automatic powder quantitative servo weighing and packaging machine, including a fixed base frame (1), a support top plate (2) located at the top of the fixed base frame (1). The support top plate (2) is fixedly installed with a speed-adjusting hopper (3). One side of the speed-adjusting hopper (3) is equipped with a servo motor (4). The speed-adjusting hopper (3) is internally equipped with a blanking electric control valve (303), and the servo motor (4) is drivingly connected to the blanking electric control valve (303); A bag-clamping blanking bin (5) is arranged below the support top plate (2), and the support top plate (2) is equipped with a plurality of weighing unit components (6) for sensing and detecting the downward acting force of the bag-clamping blanking bin (5); A set of bag-clamping arms (7) are arranged on both sides of the bag-clamping blanking bin (5). A cylinder assembly (701) is arranged between the two bag-clamping arms (7) in the same group. The lower ends of the two bag-clamping arms (7) in the same group are equipped with mutually cooperating bag-clamping plates (702); A controller (8) is fixedly installed on one side of the fixed base frame (1). The controller (8) is connected to the servo motor (4) and the air supply mechanism of the cylinder assembly (701) through an electrical control circuit. The controller (8) is connected to the weighing unit components (6) through a signal line; The feeding and weighing control method includes the following steps: S1. The controller (8) drives and controls the cylinder assembly (701) to open the bag-clamping arms (7) and the bag-clamping plates (702). The material bag is sleeved at the lower opening position of the bag-clamping blanking bin (5). The controller (8) drives and controls the cylinder assembly (701) to close the bag-clamping arms (7) and the bag-clamping plates (702), and the material bag is clamped at the lower opening position of the bag-clamping blanking bin (5); S2. The weighing unit assembly (6) performs no-load weighing and transmits and stores the weighed information in the controller, denoted as M O ; S3. The controller (8) controls the blanking mechanism to start blanking. The material enters the speed-adjusting hopper (3) from the feed pipe (301). The controller (8) controls the servo motor (4) to open the blanking electric control valve (303) of the speed-adjusting hopper (3); S4. The control system of the controller (8) preset the net weight M of the material in a single bag C , and let the real-time weight information sensed and monitored by the weighing unit assembly (6) be M X ; S5. When the controller (8) drives and controls the discharging rate of the speed-adjustable hopper (3) to be V B , where λ is the standard discharging rate reference coefficient, 0.8 < λ < 1, ; S6. When the controller (8) drives and controls the discharging rate of the speed-regulating hopper (3) to be F(t), then: ; where m and n are integers, m≥2, n≥2, , T is the period of the change in the blanking rate, T = 2π; S7. When , the controller (8) drives and controls the speed-regulating hopper (3) to stop discharging materials, and the controller (8) drives and controls the cylinder assembly (701) to open the bag clamping arms (7) and the bag clamping plates (702), and the fully loaded material bag drops down.

2. The feeding and weighing control method for an automatic powder quantitative servo weighing and packaging machine according to claim 1, characterized in that: A material quantity monitoring unit (304) is arranged in the speed-adjusting hopper (3) to monitor the total amount of materials accumulated in the speed-adjusting hopper (3). When the total amount of materials accumulated in the speed-adjusting hopper (3) exceeds the maximum material accumulation amount preset by the controller (8) system, the material conveying mechanism upstream of the feed pipe (301) stops feeding the feed pipe (301).

3. The feeding and weighing control method for an automatic powder quantitative servo weighing and packaging machine according to claim 1, characterized in that: In the discharging rate F(t) of the speed-adjustable hopper (3): , when the parameter value of A n reaches the lowest value preset by the controller (8) system, A n+1 , A n+2 , A n+3 ,... all take the value of A n .

4. An automatic powder quantitative servo weighing and packaging machine, characterized in that, It is applied to the feeding and weighing control method for an automatic powder quantitative servo weighing and packaging machine according to any one of claims 1 to 3.

5. The automatic powder quantitative servo weighing and packaging machine according to claim 4, characterized in that: The top of the speed-adjusting hopper (3) is provided with a feed pipe (301), and the bottom of the speed-adjusting hopper (3) is provided with a material buffer bin (302) extending into the upper opening position of the bag-clamping blanking bin (5); Among them, the material buffer bin (302) vertically penetrates and is fixedly installed on the support top plate (2).

6. The automatic powder quantitative servo weighing and packaging machine according to claim 4, characterized in that: The weighing unit assembly (6) is configured with a weighing suspension rod (601) that penetrates downward through the support top plate (2). A horizontal panel (501) is fixedly provided on the circumferential side of the bag clamping and blanking bin (5). The lower end of the weighing suspension rod (601) is fixedly connected to the edge position of the horizontal panel (501), and the upper end of the bag clamping arm (7) is movably connected to the edge position of the horizontal panel (501).

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