Powder feed metering device and method of using same

Abstract

The application discloses a kind of powder material feeding metering device and its use method, belong to material feeding metering field.It includes main frame, stock bin, screw feeder, vibrating feeder, weight sensor and controller;Stock bin is set at the top of main frame, screw feeder is set below the discharge port at the bottom of stock bin;Vibrating feeder includes vibrator installed on main frame and shell fixedly connected with vibrator, the outlet housing of screw feeder is inserted into the shell inlet of vibrating feeder, there is a certain vibration gap between the outlet housing of screw feeder and the shell inlet of vibrating feeder, the shell outlet of vibrating feeder is fixedly provided with a drop tube, and the weight of material falling into the packaging bag is measured by weight sensor;Driving motor, vibrator and weight sensor are connected with controller.The application firstly feeds rapidly by screw feeder, then feeds accurately by vibrating feeder at low speed, which effectively prevents material from hardening, and realizes rapid and accurate metering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material feeding and metering, in particular to a powder feeding and metering device and a method for using the same. BACKGROUND

[0002] The powder feeding and metering device is a kind of feeding and metering equipment for materials, which is widely used in the metering equipment of chemical industry, food, medicine and the like to realize the powder feeding and packaging process. The existing powder feeding and metering device has a screw feeding and a vibrating feeding.

[0003] The screw feeding transports the powder by a screw conveyor. Due to the water absorption of many raw materials, the raw materials are easily damp and absorb water. In particular, when the powder feeding and metering device is applied to the fertilizer field, the fertilizer raw materials have strong water absorption. The conveying mode of the screw conveyor is extrusion conveying. The damp and water-absorbed raw materials are easily hardened in the screw conveyor under extrusion, and cannot realize feeding and conveying. In order to solve the hardening problem of the screw conveying, the pitch needs to be increased. However, when the powder is fed and packaged, not only the raw materials need to be conveyed, but also the conveyed raw materials need to be accurately metered, so that the weight of each bag of powder after packaging is the same. Too large pitch leads to the inability to accurately meter the conveyed raw materials.

[0004] The vibrating feeding transports the raw materials by the vibration of the conveying plate. Although the vibrating feeding can realize relatively accurate metering, the vibrating feeding speed is very slow, and cannot meet the rapid production of powder feeding and packaging. SUMMARY

[0005] The present application provides a powder feeding and metering device and a method for using the same. In the process of one-time feeding and metering, the powder is first rapidly fed by a screw feeder, and then accurately fed at low speed by a vibrating feeder, which not only effectively prevents the material from hardening, but also realizes rapid and accurate metering.

[0006] The present application provides the following technical solutions:

[0007] A powder feeding and metering device, comprising a main frame, a stock bin, a screw feeder, a vibrating feeder, a weight sensor and a controller, wherein:

[0008] The stock bin is arranged at the top of the main frame, the screw feeder is arranged below the discharge port at the bottom of the stock bin, and the screw feeder is driven by a driving motor;

[0009] The vibrating feeder comprises a vibrator and a shell, the vibrator is installed on the main frame, the shell is fixedly connected with the vibrator, the outlet shell of the screw feeder is inserted into the shell inlet of the vibrating feeder, and a certain vibration gap is formed between the outlet shell of the screw feeder and the shell inlet of the vibrating feeder, and a material falling cylinder for making the material fall into the packaging bag is fixedly arranged at the shell outlet of the vibrating feeder.

[0010] The driving motor, the vibrator and the weight sensor are connected with the controller.

[0011] Further, the screw end of the screw feeder is flush with the outlet shell of the screw feeder, or the screw end of the screw feeder protrudes from the outlet shell of the screw feeder.

[0012] Further, a dust removal cover cylinder surrounding the material falling cylinder is arranged outside the material falling cylinder, the inner surface of the dust removal cover cylinder is spaced apart from the outer surface of the material falling cylinder by a certain gap, the upper end of the dust removal cover cylinder is connected with the upper end of the material falling cylinder through a flexible air-tight material, air outlets are formed in the side wall of the dust removal cover cylinder, a dust removal device is connected with the air outlets through an air pipe, and the dust removal device is connected with a fan.

[0013] Further, a bag clamping device for clamping the upper opening of the packaging bag is arranged on the dust removal cover cylinder, one end of the weight sensor is arranged on the main frame, and the other end is connected with the dust removal cover cylinder.

[0014] Further, a shutter is arranged at the shell outlet of the vibrating feeder, the opening and closing degree of the shutter is controlled by a driving device, and the driving device is connected with the controller.

[0015] Further, a mounting plate is fixedly arranged on the main frame or the material bin, a certain vibration gap is formed between the mounting plate and the outer wall of the shell of the vibrating feeder, a certain vibration gap is formed between the shutter and the shell of the vibrating feeder, and the driving device is mounted on the mounting plate.

[0016] Further, a damping foot pad is mounted on the vibrator, and the vibrator is arranged on the main frame through the damping foot pad.

[0017] Further, a counterweight steel plate is arranged on the vibrator.

[0018] Further, a soft sealing material is arranged between the outlet shell of the screw feeder and the shell inlet of the vibrating feeder.

[0019] Further, the fan and the dust removal device are mounted inside the main frame and located at the bottom of the main frame.

[0020] A method for using the powder feeding and metering device, the method comprising:

[0021] S1: setting a packaging bag under the dropping cylinder, starting the driving motor and the vibrator by the controller, and feeding the material in the hopper into the packaging bag from the dropping cylinder under the conveying of the screw feeder and the vibrating feeder, and measuring the weight of the material in the packaging bag by the controller in real time through the weight sensor;

[0022] S2: when the weight of the material in the packaging bag reaches the set weight, the controller stops the driving motor, keeps the vibrator on, and feeds the material remaining in the vibrating feeder shell into the packaging bag from the dropping cylinder under the vibration conveying of the vibrating feeder, wherein the set weight is less than the target weight of the packaging bag;

[0023] S3: when the weight of the material in the packaging bag reaches the target weight, the controller stops the vibrator and stops feeding, and removes the packaging bag.

[0024] Further, the method further comprises:

[0025] S4: while removing the packaging bag, the controller starts the fan, and feeds the material dust into the dust removal device through the fan for dust removal.

[0026] Further, in S1 and S2, the controller controls the opening and closing degree of the gate through the driving device according to the feeding speed;

[0027] In S3, while removing the packaging bag, the controller closes the gate through the driving device.

[0028] The present application has the following beneficial effects:

[0029] In the present application, in the process of feeding and metering once, the screw feeder is used for fast feeding first, and the vibrating feeder is used for slow and accurate feeding when approaching the target weight, which effectively prevents the material from hardening and realizes fast and accurate metering. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a perspective view of the powder feeding and metering device of the present application;

[0031] Figure 2 It is a front view of the powder feeding and metering device of the present application;

[0032] Figure 3 It is a side view of the powder feeding and metering device of the present application;

[0033] Figure 4 It is a sectional view of one embodiment of the powder feeding and metering device of the present application in A-A direction;

[0034] Figure 5A-A sectional view of another embodiment of the powder feeding and metering device of the present application;

[0035] Figure 6 A top view of the powder feeding and metering device of the present application. DETAILED DESCRIPTION

[0036] To make the technical problems, technical solutions and advantages of the present application clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0037] The present application provides a powder feeding and metering device, as shown in the drawings, which comprises a main frame 1, a hopper 2, a screw feeder 4, a vibrating feeder, a weight sensor 10 and a controller, wherein: Figures 1-6

[0038] The hopper 2 is arranged on the top of the main frame 1, the screw feeder 4 is arranged below the discharge port 3 at the bottom of the hopper 2, and the screw feeder 4 is driven by a driving motor 5. The driving motor can be a reduction motor, and the shaft of the screw feeder is directly connected with the shaft hole of the reduction motor.

[0039] The vibrating feeder comprises a vibrator 8 and a housing 6, the vibrator 8 is mounted on the main frame 1, the housing 6 is fixedly connected with the vibrator 8, the outlet housing 7 of the screw feeder 4 is inserted into the housing inlet 22 of the vibrating feeder, and there is a certain vibration gap between the outlet housing 7 of the screw feeder 4 and the housing inlet 22 of the vibrating feeder. The housing outlet 23 of the vibrating feeder is fixedly provided with a material falling cylinder 9 for making the material fall into a packaging bag, and the weight of the material in the packaging bag is weighed by the weight sensor 10.

[0040] The screw feeder and the vibrating feeder described above can be arranged horizontally or inclined downward at a certain angle along the powder conveying direction, and the present application does not limit this.

[0041] The driving motor 5, the vibrator 8 and the weight sensor 10 are all connected with the controller, the controller is located in a control box 11, and the control box 11 is arranged on the side of the main frame 1.

[0042] The present application is used for powder feeding and metering, powder packaging, and particularly used for fertilizer feeding and packaging in the fertilizer preparation process. The use method of the present application is as follows:

[0043] S1: arranging a packaging bag below the material falling cylinder, starting the driving motor and the vibrator by the controller, and making the material in the hopper fall into the packaging bag under the conveying of the screw feeder and the vibrating feeder, and the controller measures the weight of the material in the packaging bag in real time through the weight sensor.

[0044] In the present application, the material can be poured into the hopper manually, or conveyed into the hopper by other ways, such as a hoist.​

[0045] In this step, the packaging bag can be placed on the metering scale located below the blanking cylinder, the metering scale and the main frame are two independent devices, the weight sensor is located in the metering scale, and the weight of the packaging bag is measured in real time. Of course, the packaging bag can also be clamped on the blanking cylinder, and the weight of the packaging bag is measured in real time through the weight sensor arranged on the main frame.

[0046] This step is used for rapid feeding into the packaging bag, the conveying speed of the screw feeder is fast, and the pitch of the screw feeder is large, and the pitch is set according to the material, so that the material cannot be hardened in the screw feeder.

[0047] S2: When the weight of the material in the packaging bag reaches the set weight, the controller closes the driving motor, keeps the vibrator open, and the material remaining in the vibration feeder shell falls into the packaging bag from the blanking cylinder under the vibration conveying of the vibration feeder. Wherein, the set weight is less than and close to the target weight of the packaging bag.

[0048] Because the pitch of the screw feeder is large, the conveying of the material is difficult to accurately control, when the weight of the material in the packaging bag is close to the target weight of the packaging bag, the screw feeder cannot be used to accurately measure the weight of the material in the packaging bag.

[0049] Therefore, when the weight of the material in the packaging bag is close to the target weight of the packaging bag, the driving motor is closed, and the screw feeder is not used for conveying. Only the vibration conveying mode is used to make the material remaining in the vibration feeder shell fall into the packaging bag from the blanking cylinder under the vibration conveying, so as to realize low-speed accurate feeding.

[0050] S3: When the weight of the material in the packaging bag reaches the target weight, the controller closes the vibrator and stops feeding, removes the packaging bag, and completes the once feeding and measuring process.

[0051] In the once feeding and measuring process, the present application first feeds rapidly through the screw feeder, then feeds accurately at low speed through the vibration feeder when close to the target weight, which effectively prevents the material from hardening and realizes rapid and accurate measurement.

[0052] After the material absorbs water and gets wet, it is easy to stick to the inner surface of the blanking cylinder. In order to solve this problem, the shell 6 and the blanking cylinder 9 are fixed together and vibrated together, which prevents the material from sticking to the inner surface of the blanking cylinder under the action of vibration.

[0053] The shell and the blanking cylinder can be fixed together and vibrated together in various ways, which are not limited in the present application, for example: the shell and the blanking cylinder can be integrally processed and formed, and the whole is integrated, or the shell and the blanking cylinder are two parts, which are assembled and welded or bolted together.

[0054] In the present application, the material is conveyed into the shell of the vibrating feeder by the screw feeder, and then needs to be conveyed for a distance in the shell of the vibrating feeder before reaching the dropping cylinder. When the material has a large viscosity, the conveying in the shell of the vibrating feeder is not smooth and is prone to blockage. To solve this problem, as shown in Figure 5 the end of the screw of the screw feeder 24 is extended out of the outlet shell 7 of the screw feeder by a certain length, and the screw extended out of the outlet shell is located in the shell of the vibrating feeder, conveying the material in the shell of the vibrating feeder to the dropping cylinder, preventing the shell of the vibrating feeder from being blocked due to the large viscosity of the material.

[0055] When the material has a small viscosity, the end of the screw of the screw feeder 24 does not need to be extended out of the outlet shell 7 of the screw feeder, but only needs to be flush with the outlet shell 7 of the screw feeder, as shown in Figure 4 .

[0056] When the weight of the material in the packaging bag reaches the target weight, the feeding needs to be stopped, and a feeding and conveying is completed, and the packaging bag needs to be removed for subsequent processes. Since the material contains dust, dust pollution is inevitable during the removal of the packaging bag. To solve this problem, the present application is provided with a dust removal cover cylinder 12 surrounding the dropping cylinder 9 outside the dropping cylinder 9, the inner surface of the dust removal cover cylinder 12 is spaced apart from the outer surface of the dropping cylinder 9 by a certain gap, the upper end of the dust removal cover cylinder 12 is connected with the upper end of the dropping cylinder 9 by a flexible air-tight material 21, and the sidewall of the dust removal cover cylinder 12 is provided with an air outlet, the air outlet is connected with a dust removal device 14 through an air pipe 13, and the dust removal device 14 is connected with a fan 15.

[0057] Based on the above structure, the use method of the present application further comprises:

[0058] S4: while removing the packaging bag, the controller starts the fan to suck the material dust into the dust removal device through the fan, thereby achieving dust removal.

[0059] During dust removal, the material dust first enters the gap between the dust removal cover cylinder and the dropping cylinder from the bottom of the dust removal cover cylinder and the dropping cylinder, and then sequentially enters the dust removal device from the air outlet and the air pipe, thereby separating the material dust from the air. After dust removal, the air is discharged from the fan, and the separated material dust can be added to the stock bin for repeated use.

[0060] Since the dropping cylinder vibrates together with the shell, and the dust removal cover cylinder does not vibrate, the upper end of the dust removal cover cylinder is connected with the upper end of the dropping cylinder by a flexible air-tight material such as plastic cloth, which not only achieves sealing, but also enables the dropping cylinder to vibrate and the dust removal cover cylinder not to vibrate.

[0061] Further, the dust cover cylinder 12 is provided with a bag clamping device 16 for clamping the upper opening of the packaging bag, one end of the weight sensor 10 is arranged on the main frame 1, and the other end is connected with the dust cover cylinder 12, so as to weigh the material in the packaging bag. When the weight of the material in the packaging bag reaches the target weight, the bag clamping device is automatically opened, and the packaging bag is automatically dropped.

[0062] As an improvement of the present application, a shutter 17 is arranged at the outlet 23 of the vibrating feeder, the opening and closing degree of the shutter 17 is controlled by a driving device 18, the driving device 18 is connected with the controller, and in one example, the driving device 18 can be a pneumatic cylinder.

[0063] In the foregoing S1 and S2, the controller can control the opening and closing degree of the shutter by the driving device according to the feeding speed. In S3, the controller can close the shutter by the driving device while removing the packaging bag.

[0064] For example, when fast feeding is required, the shutter 17 is opened to a large degree, or is fully opened; when medium or low speed feeding is required, the shutter 17 is opened to a small degree, and when the weight of the material in the packaging bag reaches the target weight, no feeding is required, and the controller controls the driving device to close the shutter.

[0065] The shutter can be one shutter, and the opening and closing degree is controlled by controlling the opening angle of the shutter by the controller; or the shutter can be a plurality of shutter units arranged side by side, and the opening and closing degree is controlled by controlling the opening and closing of the shutter units by the controller.

[0066] For example, the shutter can include a first shutter unit 17 and a second shutter unit (not shown) arranged side by side, the first shutter unit 17 and the second shutter unit are driven to open and close by a first driving device 18 and a second driving device 20 respectively, and the first driving device 18 and the second driving device 20 are connected with the controller.

[0067] Based on the above structure, the foregoing S1 specifically includes:

[0068] S11: The upper opening of the packaging bag is clamped on the dust cover cylinder by the bag clamping device, the controller controls the first driving device and the second driving device to open the first shutter unit and the second shutter unit, and the controller measures the weight of the material in the packaging bag in real time by the weight sensor.

[0069] S12: The controller starts the driving motor and the vibrator, the driving motor drives the screw feeder to rotate at a set high speed, the vibrator drives the shell of the vibrating feeder to vibrate at a set amplitude, and the material is delivered into the packaging bag. This step is a fast feeding process.

[0070] Similarly, S2 specifically includes:

[0071] S21: when the weight of the material in the packaging bag reaches the set first weight, the driving motor drives the screw feeder to rotate at a set low speed, and the vibrator drives the shell of the vibrating feeder to vibrate at a set amplitude, so as to deliver the material into the packaging bag. This step is a medium-speed feeding process.

[0072] S22: when the weight of the material in the packaging bag reaches the set second weight, the controller closes the driving motor, keeps the vibrator open, and the controller controls the first driving device to close the first shutter unit, so that the remaining material in the vibrating feeder falls into the packaging bag from the material falling cylinder under the vibration delivery of the vibrating feeder shell. This step is a low-speed precise feeding process.

[0073] Similarly, S3 specifically includes:

[0074] S31: when the weight of the material in the packaging bag reaches the target weight, the controller closes the vibrator, the vibrator stops vibrating, and the controller controls the second driving device to close the second shutter unit to stop feeding; the bag clamping device automatically releases the bag, and the once feeding and metering process is completed.

[0075] In the present application, the screw conveyor is used to realize uniform and rapid feeding, the material flows into the vibrating feeder, the vibrating feeder realizes precise feeding, the material is metered through the weight sensor installed on the bag clamping device, and the dust collector recycles and processes the dust generated during the falling of the bag through the air pipe.

[0076] In the present application, the mounting plate 25 is fixedly arranged on the main frame 1 or the material bin 2, the position of the mounting plate can be above the shell of the vibrating feeder 3, and there is a certain vibration gap between the mounting plate 25 and the outer wall of the shell 6 of the vibrating feeder 3, and there is a certain vibration gap between the shutter 17 and the shell 6 of the vibrating feeder 3, and the driving device 18 of the shutter 17 is installed on the mounting plate 25.

[0077] When the shell 6 of the vibrating feeder 3 vibrates, due to the existence of the vibration gap between the mounting plate 25 and the shell 6 of the vibrating feeder 3 and the existence of the vibration gap between the shutter 17 and the shell 6 of the vibrating feeder 3, the mounting plate 25 and the shutter 17 will not vibrate with the shell 6 of the vibrating feeder 3, and the driving device 18 on the mounting plate 25 will not vibrate, preventing the driving device 18 from being damaged due to vibration and improving the service life of the driving device 18.

[0078] In order to improve the sealing performance of the shell 6 of the vibrating feeder 3, a soft sealing material such as rubber or soft rubber can be arranged in the vibration gap between the shutter 17 and the shell 6 of the vibrating feeder 3 to seal.

[0079] The aforementioned vibrator 8 is located inside the main frame 1 and below the housing 6 of the vibrating feeder, and a shock-absorbing foot pad is mounted on the vibrator 8, and the vibrator 8 is arranged on the main frame 1 through the shock-absorbing foot pad. The shock-absorbing foot pad can reduce the vibration of the main frame and reduce the noise.

[0080] A counterweight steel plate is also arranged on the vibrator 8, and the counterweight steel plate is used to increase the mass of the main frame, and the greater the mass, the smaller the vibration, which can effectively reduce the vibration of the main frame, and in particular can reduce the vibration of the lower part of the main frame with the vibrator.

[0081] A soft sealing material 19 such as sponge or soft rubber is arranged between the outlet housing 7 of the screw feeder and the housing inlet 22 of the vibrating feeder, and the soft sealing material can not only realize the sealing of the connection between the vibrating feeder and the screw feeder, but also prevent the screw feeder from vibrating with the vibrating feeder.

[0082] The aforementioned fan and dust removal device are installed inside the main frame and at the bottom of the main frame, and a guard plate can be arranged at the bottom of the main frame, and a door that can be opened and closed is arranged on the guard plate; and the air pipe of the dust removal device can be directly connected with the bag clamping device.

[0083] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A powder dosing metering device, characterized in that, The device comprises a main frame, a hopper, a screw feeder, a vibrating feeder, a weight sensor and a controller, wherein: The hopper is arranged on the top of the main frame, and the screw feeder is arranged below the discharge port at the bottom of the hopper and is driven by a driving motor; The vibrating feeder comprises a vibrator and a housing, the vibrator is mounted on the main frame, the housing is fixedly connected with the vibrator, the outlet housing of the screw feeder is inserted into the housing inlet of the vibrating feeder, and a certain vibration gap is formed between the outlet housing of the screw feeder and the housing inlet of the vibrating feeder, the housing outlet of the vibrating feeder is fixedly provided with a material dropping cylinder for dropping the material into the packaging bag, and the weight of the material in the packaging bag is weighed by the weight sensor; The driving motor, the vibrator and the weight sensor are connected with the controller; The screw terminal of the screw feeder extends out of the outlet housing of the screw feeder by a certain length; A shutter is arranged at the housing outlet of the vibrating feeder, the opening and closing degree of the shutter is controlled by a driving device, and the driving device is connected with the controller; The shutter comprises first and second shutter units arranged side by side, and the first and second shutter units are driven to open and close by first and second driving devices respectively; When the weight of the material in the packaging bag reaches a set first weight, the driving motor drives the screw feeder to rotate at a set low speed, the vibrator drives the housing of the vibrating feeder to vibrate at a set amplitude, and the material is conveyed into the packaging bag; When the weight of the material in the packaging bag reaches a set second weight, the controller closes the driving motor, keeps the vibrator open, and controls the first driving device to close the first shutter unit, so that the remaining material in the vibrating feeder falls into the packaging bag from the material dropping cylinder under the vibration conveying of the vibrating feeder housing.

2. A powder feed metering device according to claim 1, wherein, A dust removal cover cylinder is arranged outside the material dropping cylinder to surround the material dropping cylinder, the inner surface of the dust removal cover cylinder is spaced apart from the outer surface of the material dropping cylinder by a certain gap, the upper end of the dust removal cover cylinder is connected with the upper end of the material dropping cylinder through a flexible air-tight material, air outlets are formed in the side wall of the dust removal cover cylinder, a dust removal device is connected with the air outlets through an air pipe, and the dust removal device is connected with a fan.

3. A powder feed metering device according to claim 2, wherein, A bag clamping device is arranged on the dust removal cover cylinder to clamp the upper opening of the packaging bag, one end of the weight sensor is arranged on the main frame, and the other end is connected with the dust removal cover cylinder.

4. A powder feeding metering device according to claim 3, wherein An installation plate is fixedly arranged on the main frame or the hopper, a certain vibration gap is formed between the installation plate and the outer wall of the housing of the vibrating feeder, a certain vibration gap is formed between the shutter and the housing of the vibrating feeder, and the driving device is mounted on the installation plate.

5. The powder feeding and metering device of claim 1, wherein, A shock-absorbing foot pad is mounted on the vibrator, and the vibrator is arranged on the main frame through the shock-absorbing foot pad.

6. A powder feeding metering device according to claim 5, wherein A counterweight steel plate is arranged on the vibrator.

7. The powder feeding and metering device of claim 1, wherein A soft sealing material is arranged between the outlet housing of the screw feeder and the housing inlet of the vibrating feeder.

8. A method of using a powder feed metering device according to any one of claims 1-7, characterized in that, The method comprises: S1: The packaging bag is arranged below the blanking cylinder, the controller starts the driving motor and the vibrator, the material in the hopper is conveyed into the packaging bag from the blanking cylinder under the conveying of the screw feeder and the vibrating feeder, and the controller measures the weight of the material in the packaging bag in real time through the weight sensor; S2: When the weight of the material in the packaging bag reaches the set weight, the controller stops the driving motor, keeps the vibrator on, and the material remaining in the vibrating feeder shell is conveyed into the packaging bag from the blanking cylinder under the vibration of the vibrating feeder, wherein the set weight is less than the target weight of the packaging bag; S3: When the weight of the material in the packaging bag reaches the target weight, the controller stops the vibrator and stops feeding, and removes the packaging bag.

9. The method of using a powder feed metering device of claim 8, wherein, The method further comprises: S4: While removing the packaging bag, the controller starts the fan, and the material dust is sucked into the dust removal device for dust removal.

10. A method of using a powder dosing metering device according to claim 8 or 9, characterized in that, In S1 and S2, the controller controls the opening and closing degree of the gate according to the feeding speed through the driving device; In S3, while removing the packaging bag, the controller closes the gate through the driving device.

Images