Bag feeding type packaging machine

Abstract

The invention relates to the technical field of packaging equipment, in particular to a bag feeding type packaging machine which comprises a fixing frame, a lifting device is arranged on the fixing frame, a discharging pipe with a discharging opening and a hopper with a feeding opening are connected to the lifting device, and a bag feeding device used for conveying packaging bags to the position below the hopper is arranged on the fixing frame. The bag feeding device is characterized in that the hopper is provided with a blocking device, and the blocking device is used for preventing floating dust in the hopper from falling out of a packaging bag when the packaging bag is transferred by the bag feeding device. The blocking device is arranged at the hopper, after filling is completed, the blocking device blocks the discharging port, materials floating in the hopper are prevented from falling out of the hopper, powder in the hopper can fall into a packaging bag again in the next filling process, and the problem that part of the materials fall off after the materials are filled in the hopper, so that the material filling efficiency is improved is solved. And the problems of material waste and air pollution are solved.

Description

Technical Field

[0001] This invention relates to the field of packaging equipment technology, specifically to a bag-type packaging machine. Background Technology

[0002] Pre-packaging machines can be used to package materials in different states, such as liquids, blocks, granules, and powders. They are highly automated and efficient, saving many companies a lot of labor costs.

[0003] There are two types of pre-filled bag packaging machines: rotary and linear. The main processes for both types are the same: bag loading, printing the production date, opening the bag, filling the material, heat-sealing the air vent, and discharging. Depending on the material, additional processes may be required. In the material filling process, the bag feeding device delivers the opened bag to the bottom of the hopper. The hopper then descends to insert itself into the bag. Next, the storage hopper above the hopper feeds material into the bag, completing the filling process. The hopper then rises, and the bag feeding device removes the filled bag and returns any unfilled bags to the bottom of the hopper, allowing the next bag to be filled.

[0004] When filling powdered materials, some powder will float inside the hopper. Even after the hopper rises, it will remain inside and cannot fall. It will only fall slowly when the bag feeding device moves the packaging bag. This will cause this part of the material to fall directly outside the packaging bag, resulting in waste. In addition, this part of the powder will float in the air, affecting the air quality in the workshop and thus affecting human health.

[0005] To address the issue of material falling out of the hopper after filling, leading to material waste and air pollution, a bag-type packaging machine is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a bag packaging machine that solves the problems mentioned in the background art by setting a blocking device on the hopper to block floating powder inside the hopper when the hopper rises.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A bag-feeding packaging machine includes a fixed frame with a storage hopper and a bag-feeding device. The discharge port of the storage hopper is located directly above the hopper. The bag-feeding device is installed above the fixed frame. The bag-feeding device is a bag-feeding device of the prior art bag-feeding packaging machine, which can realize functions such as bag loading, bag feeding, bag opening, and sealing. The fixed frame is equipped with a lifting device, which consists of a lifting cylinder and a connecting frame connected to the hopper. The lifting cylinder is bolted to the fixed frame. The lifting device is connected to a discharge pipe with a discharge port and a hopper with a feed port. The discharge pipe is connected to the hopper. The hopper is equipped with a blocking device to prevent dust floating inside the hopper from falling into the external environment.

[0009] Preferably, the blocking device includes a rotating shaft rotatably mounted on the discharge pipe and multiple drive rods fixedly mounted on the rotating shaft. The multiple drive rods are connected to a blocking component. The blocking component is an annular silicone sheet with a skirt structure. The skirt structure forms multiple sets of protrusions and recesses. The number of sets of protrusions and recesses is the same as the number of drive rods. The drive rods are connected to the outer wall of the blocking component located in the recess. The fixed frame is provided with a drive assembly for driving the multiple drive rods to rotate simultaneously along the center of the discharge pipe. The simultaneous rotation of the multiple drive rods can cause the ends of the blocking component to abut against each other and block the discharge port.

[0010] To prevent floating powder from falling into the hopper, a blocking device is installed at the discharge port. The working principle of the blocking device is as follows: When the packaging bag moves below the hopper, the lifting device lowers the hopper. During descent, the drive unit drives multiple drive rods to open, allowing the blocking component to enter the bag opening and guide the material into the bag for filling. When the hopper rises, the drive unit drives multiple drive rods to rotate simultaneously towards the center of the hopper, causing the blocking component to fold and its ends to fit together, thus blocking the discharge port and preventing material from falling outside the hopper. During the next filling, the powder inside the hopper will fall back into the packaging bag, thus avoiding material waste and preventing floating powder from polluting the workshop air.

[0011] In this invention, a starting valve can also be used to block the discharge port. However, the starting valve needs to be installed inside the discharge pipe. If it is installed inside, it is not easy to clean the valve. Moreover, the pneumatic valve generates a large vibration when it is working, which can easily cause the discharge pipe to vibrate to the outside of the bag opening, thus making it impossible to fill the material.

[0012] In this invention, the shielding component can be made of rigid or soft material. The shielding component can be made of silicone material. The soft material can be glued or sleeved on the drive rod. Rotation can be achieved by the deformation of the soft material itself. The soft material can be laid at the rotation connection position, which can effectively prevent the accumulation of material in the gap of the rotation connection part. Therefore, the shielding component is made in one piece to avoid the generation of gaps.

[0013] When using soft materials, multiple elastic sheets with greater elasticity can be connected between multiple drive rods. The material can be deformed to block the discharge port. However, if the soft material undergoes large deformation multiple times, the service life of the blocking component will be reduced, resulting in frequent replacement of the blocking component. Therefore, the blocking component is designed with multiple protrusions and recesses. The deformation of the blocking component is small when it is folded or opened, which can effectively extend the service life of the blocking component.

[0014] Among soft materials, silicone has good elasticity and strong corrosion resistance, making it the preferred material for shielding components. However, there are many types of silicone, and different types can be toxic, easily contaminating materials. Therefore, food-grade silicone is required when products have certain quality requirements, such as food powders. Some powders are corrosive, and medical-grade silicone, which is corrosion-resistant and antibacterial, is required for materials with high quality requirements. Among the three types of silicone, ordinary silicone is the cheapest, followed by food-grade silicone, with medical-grade silicone being the most expensive. Therefore, the appropriate silicone should be selected based on the material requirements.

[0015] Preferably, the drive assembly includes a fixed seat bolted to a fixed frame, and a plurality of racks, the same number as the drive rods, are bolted to the fixed seat. Each of the rotating shafts is connected to a gear that meshes with the racks.

[0016] Preferably, the gears and racks are made of felt material, and the racks are self-lubricating racks.

[0017] Preferably, the maximum rotation angle of the drive rod is 100°-120°, and when the drive rod rotates to the maximum angle, the outer diameter of the recess can be deformed to be the same as the outer diameter of the protrusion, and when the drive rod rotates to the maximum angle, the width of the shielding component is greater than the width of the packaging bag.

[0018] By installing a mounting base with multiple racks on a fixed frame, and connecting a gear that meshes with the racks on a rotating shaft, the hopper moves up and down. The gear and rack drive the drive rod to open and close. This drive method allows the blocking device to move synchronously with the hopper, without affecting packaging efficiency, and does not require an additional power source, resulting in lower operating costs.

[0019] In this invention, a rotary cylinder can also be used to drive the drive rod. However, when the rotary cylinder is installed at the hopper, the weight at the discharge port will be large, and it is easy to generate large vibrations when the cylinder is working. This can easily cause the discharge pipe to vibrate to the outside of the bag opening when it moves down, affecting the filling of the material. Compared with the gear and rack drive method, multiple rotary cylinders are expensive, which increases the manufacturing cost of the equipment.

[0020] The material filling time for a single operation is typically around 4 seconds. As a result, the gear and rack operate at a high frequency, making lubrication essential. However, excessive lubricating oil on the gear and rack can easily flow onto the drive rod, causing oil contamination of the material during operation. Therefore, the gear and rack are made of felt material and are self-lubricating. During operation, the rack can achieve automatic lubrication, and based on the oil absorption characteristics of felt gears and racks, lubricating oil can be prevented from flowing onto the drive rod.

[0021] Preferably, the discharge pipe includes an installation cylinder sleeved at the discharge port, and the diameter of the installation cylinder is larger than the diameter of the discharge port. Multiple rotating shafts are installed on the installation cylinder. The shielding component is connected to an installation sleeve. The installation sleeve is sleeved on the upper part of the discharge pipe and is located between the installation cylinder and the hopper. The thickness of the installation sleeve is greater than the width of the gap between the installation cylinder and the hopper, so that the installation sleeve is interference-fitted between the installation cylinder and the discharge pipe.

[0022] To prevent material from entering the gap between the drive rod and the rotating mounting part of the hopper, the shielding component must cover the connection between the drive rod and the hopper. This requires a mounting sleeve on the shielding component to cover the connection. If the mounting sleeve is located inside the discharge pipe, it will create raised steps on the inner wall of the discharge pipe, causing material to accumulate at the steps. Over time, this can easily lead to deterioration and affect the quality of subsequent packaged materials. Therefore, a mounting cylinder is installed on the hopper, with the drive rod hinged to it. The mounting cylinder is fitted onto the outer wall of the discharge pipe, and the mounting sleeve is located between the discharge pipe and the mounting cylinder. This ensures that only recessed steps are created inside the discharge pipe, preventing material accumulation. Furthermore, the mounting sleeve is interference-fitted between the mounting cylinder and the discharge pipe to prevent gaps between the mounting sleeve and the discharge pipe, which could easily trap material and cause deterioration at the gaps, affecting the quality of the material.

[0023] Preferably, the shielding component has a sleeve on the outer wall of the recess, the sleeve and the shielding component form a channel, the channel is closed on the side away from the mounting sleeve, and the channel is interference-fitted with the drive rod.

[0024] If adhesive bonding is used during the installation of the shielding components, the extension length of the drive rod on the shielding components will be inconsistent, resulting in different folding lengths of the stacked baffles when they retract. This can easily create gaps when the shielding components retract and engage, and some material may leak out. To address this, a sleeve is installed in the recessed part of the shielding components. The sleeve and the shielding components form a channel, and the drive rod can be interference-fitted onto the sleeve. The channel closes on the side away from the mounting sleeve, ensuring that the length of the drive rod installed on the sleeve is equal, thus guaranteeing that the extension length of the drive rod on the shielding components is the same when the drive rod is installed.

[0025] Preferably, the fixing frame is provided with a guide cylinder that cooperates with the discharge cylinder.

[0026] Because the lifting device is connected to the top of the hopper in a cantilevered manner, the hopper inevitably vibrates during operation, which can easily damage the gears and racks. To address this, a guide cylinder that works in conjunction with the discharge pipe is installed on the mounting base to make the hopper move more stably during lifting and reduce damage to the gears and racks.

[0027] Preferably, the maximum rotation angle of the drive rod is 100°-120°, and when the drive rod rotates to the maximum angle, the outer diameter of the recess can be deformed to be the same as the outer diameter of the protrusion, and when the drive rod rotates to the maximum angle, the width of the shielding component is greater than the width of the packaging bag.

[0028] When filling materials, the material falling from a height causes turbulence inside the packaging bag, resulting in dust accumulation. This dust can escape from the bag's edges, affecting the workshop environment and causing material waste. To address this, the maximum rotation angle of the drive rod is set to 100°-120°. When fully open, the drive rod tightens the blocking component. During this process, the maximum width of the blocking component is greater than the bag opening width, ensuring it fits snugly against the bag opening surface. Because the blocking component fits snugly against the bag opening, there is no gap between the bag and the blocking component. The turbulence inside the bag cannot escape from the point where the blocking component fits against the bag and instead flows into the hopper. After the blocking device retracts, this dust is trapped inside the hopper, reducing dust overflow into the external workshop, minimizing dust pollution and material waste. It also prevents powder from adhering to the bag opening, causing powder trapping at the seal and affecting subsequent hot air sealing.

[0029] Preferably, a torsion spring is connected between the rotating shaft and the mounting cylinder, the length of the rack is less than the hopper stroke, the gear and rack disengage during the upward movement of the hopper, and after the gear disengages from the rack, the drive rod can rotate towards the center of the discharge pipe under the action of the torsion spring.

[0030] The hopper stroke is typically greater than 10cm. If the gear and rack are always meshed and the gear needs to rotate at least 110°, the gear circumference needs to be at least 33cm. Increasing the gear diameter causes the drive rod's rotation center to move further away from the discharge pipe, resulting in an overall enlarged discharge section. This causes the blocking component to interfere with the packaging bag as the hopper descends. Therefore, a smaller discharge pipe is needed to reduce the width of the discharge section to meet material filling requirements. However, reducing the discharge port diameter decreases the material's falling speed, thus affecting the descent rate. The force on the gear is mainly the elastic force generated by the deformation of the blocking component. The gear diameter does not need to be too large, only sufficient for strength. Therefore, a torsion spring is connected between the rotating shaft and the mounting cylinder. The rack length is at least 5cm shorter than the hopper stroke. During the hopper descent, the rack and gear change from a disengaged state to an engaged state, driving the gear to rotate. When the hopper rises, the gear and rack disengage again. At this time, the drive rod is retracted by the torsion spring, which can also block the discharge port. The reduced meshing stroke of the gear and rack allows for the design of a smaller diameter gear, ensuring that the discharge pipe has sufficient width and that the rotation center of the drive rod can be close to the mounting cylinder, so that the width of the discharge section can be closer to the diameter of the discharge pipe.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. The bag packaging machine of the present invention, by setting a blocking device at the hopper, blocks the outlet after filling to prevent material from falling outside the hopper. During the next filling, the powder inside the hopper will fall back into the packaging bag, thereby avoiding material waste. When the blocking device is opened, the blocking part fits with the opening of the packaging bag, and the turbulence generated inside the packaging bag cannot flow out from the fitting point between the blocking part and the packaging bag, but will flow into the hopper. This causes some of the raised dust to be blocked inside the hopper. The contraction of the blocking device prevents this part of the raised dust from entering the workshop, thereby reducing dust pollution and material waste.

[0033] 2. The bag-type packaging machine of the present invention uses a drive device mounted on the mounting frame to synchronize the movement of the blocking device and the hopper, which does not affect the packaging efficiency. The gears and racks of the drive device are made of felt material, which has good adsorption properties and can prevent the lubricating oil on the gears and racks from overflowing onto the blocking components and causing contamination of the material during filling. The gears and racks are driven by the hopper itself, without the need for an additional power source, which can effectively reduce the operating and manufacturing costs of the equipment. Furthermore, a guide cylinder that cooperates with the discharge pipe is installed on the mounting base to reduce the shaking of the hopper during operation, making the equipment more stable during filling.

[0034] 3. The bag packaging machine of the present invention provides an installation sleeve on the shielding component, so that the shielding component is sleeved on the outside of the discharge pipe, thereby avoiding the problem of material accumulation at the step on the inner wall of the discharge pipe, which would affect product quality. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the installation structure of the hopper, lifting device, and fixed base of the present invention;

[0037] Figure 3 For the present invention Figure 2 Partial view of the cross-section at point AA;

[0038] Figure 4 This is a schematic diagram of the hopper rising during operation according to the present invention.

[0039] Figure 5 This is a schematic diagram of the mounting structure of the fixed base and guide cylinder of the present invention;

[0040] Figure 6 This is a schematic diagram of the mounting structure of the shielding component and the drive rod of the present invention.

[0041] In the diagram: 1. Fixed frame; 2. Lifting device; 3. Discharge pipe; 301. Mounting cylinder; 4. Hopper; 5. Drive rod; 6. Blocking component; 7. Fixed seat; 8. Rack; 9. Gear; 10. Mounting sleeve; 11. Jacket; 12. Guide cylinder; 13. Storage hopper; 14. Bag feeding device; 15. Rotating shaft. Detailed Implementation

[0042] Example 1, as Figures 1 to 6 As shown, this embodiment is used for packaging 200g of quicklime powder, as detailed below:

[0043] A bag-feeding packaging machine includes a fixed frame 1 with a storage hopper 13 and a bag-feeding device 14. The discharge port of the storage hopper 13 is located directly above the hopper 4. The bag-feeding device 14 is installed above the fixed frame 1. The bag-feeding device 14 is the bag-feeding device of the prior art for bag-feeding packaging machines, and can realize functions such as bag feeding, bag delivery, bag opening, and sealing. The fixed frame 1 is provided with a lifting device 2, which consists of a lifting cylinder and a connecting frame connected to the hopper 4. The connecting frame is threaded to the output end of the cylinder and bolted to the hopper 4. The lifting cylinder is bolted to the fixed frame 1. The lifting device 2 is connected to a discharge pipe 3 with a discharge port and a hopper 4 with a feed port. Pipe 3 is connected to hopper 4. The discharge pipe 3 includes an installation cylinder 301, which is sleeved on the outer wall of the discharge pipe 3 and connected to the discharge through screw. The hopper 4 is provided with a blocking device to prevent dust floating inside the hopper 4 from falling into the external environment. The blocking device includes a rotating shaft 15 rotatably mounted on the discharge pipe 3 and four drive rods 5 fixedly mounted on the rotating shaft 15. The four drive rods 5 are connected to a shielding component 6. The shielding component 6 is made of silica gel material, and the four shielding components 6 are integrally molded. The shielding component 6 has multiple sets of protrusions and recesses. The shielding component 6 has a rubber sleeve on the outer wall of the recess. The jacket 11 forms a shielding component 6. The channel is closed on the side away from the mounting sleeve 10, and the channel is interference-fitted with the drive rod 5. The fixed frame 1 is equipped with a drive assembly for driving four drive rods 5 to rotate simultaneously around the center of the hopper 4. The simultaneous rotation of the four drive rods 5 can drive the blocking component 6 to block the discharge port. The drive assembly includes a fixed seat 7 fixedly mounted on the fixed frame 1. The fixed seat 7 is equipped with four racks 8, the same number as the drive rods 5. Each rotating shaft 15 is connected to a gear 9 that meshes with the rack 8. Both the gears 9 and the racks 8 are made of felt material, and the racks 8 are self-lubricating. The blocking component 6 is connected to the mounting sleeve 10, which is fitted onto the discharge pipe 3. 10 is located between the mounting cylinder 301 and the hopper 4. The inner diameter of the mounting cylinder 301 is 54mm, the diameter of the discharge pipe 3 is 50mm, the thickness of the mounting sleeve 10 is 2.5mm, the maximum rotation angle of the drive rod 5 is 100°-120°, when the drive rod 5 rotates to the maximum angle, the outer diameter of the recess can be deformed to be the same as the outer diameter of the protrusion, and when the drive rod 5 rotates to the maximum angle, the width of the blocking component 6 is greater than the width of the packaging bag. The larger the rotation angle, the greater the deformation of the blocking component 6, and the tighter the overlap between the blocking component 6 and the packaging bag. Therefore, the maximum rotation angle of the drive rod 5 is preferably 120°. A guide cylinder 12 that cooperates with the discharge pipe 3 is welded and installed on the fixing frame 1.

[0044] Before packaging, use an air gun to clean the hopper 4 and the shielding component 6. During the cleaning process, the air gun should not be aimed at the gear 9 and rack 8 to avoid lubricating oil splashing onto the shielding component 6, which may contaminate the material during filling. After cleaning, inject the material into the storage hopper 13 and place the packaging bag inside the bag feeding device. After the preparation is completed, the machine can be started to package the material.

[0045] During packaging, the bag feeding device 14 delivers the material to the bottom of the hopper 4. The lifting device 2 is activated, causing the hopper 4 to descend. During the descent, the drive rod 5, driven by the gear 9 and rack 8, rotates away from the center of the discharge pipe 3, causing the blocking component 6 to open. Since the center of the discharge pipe 3 is the same as the center of the packaging bag, when the drive rod 5 rotates to 90 degrees, the blocking component 6 is already inside the packaging bag and will not cause movement interference. After the drive rod 5 opens 90 degrees, the hopper 4 continues to descend, and finally the drive rod 5 opens to 110 degrees. When the drive rod 5 is fully open, it expands the blocking component 6, making the blocking component 6 fit against the opening of the packaging bag, avoiding gaps between the blocking component 6 and the packaging bag. After the hopper 4 has completely descended, the storage hopper 13 discharges the material, which flows along the hopper 4 and the discharge pipe 3 into the... Inside the packaging bag, since there is no gap between the shielding component 6 and the packaging bag, the dust inside the packaging bag floats into the hopper 4. After filling, the lifting device 2 drives the hopper 4 to move upward. Through the transmission of gear 9 and rack 8, the drive rod 5 is driven to rotate. After rising 2cm, the gear 9 and rack 8 disengage, and the drive rod 5 is folded at the discharge port under the action of the coil spring without falling. The remaining material inside the hopper 4 can then fall onto the shielding component 6. When filling the next packaging bag, the material on the shielding component 6 can fall into the next packaging bag, avoiding material waste. After the hopper 4 has risen completely, the bag feeding device 14 is activated to send the filled packaging bag to the lowering process, moving the next packaging bag below the hopper 4. The above steps are repeated to continue filling the next packaging bag.

[0046] When replacing the shielding component 6, first remove the fixing bolts between the mounting cylinder 301 and the discharge pipe 3, pull out the mounting cylinder 301 and the mounting sleeve 10, then pull out the drive rod 5 from the clamp 11, and then insert the drive rod 5 into the clamp 11 of the new shielding component 6. During installation, the drive rod 5 should be pushed hard so that it reaches the top of the channel completely, so that the drive rod 5 penetrates the clamp 11 to the same length. Then, the mounting sleeve 10 and the mounting cylinder 301 are put on the discharge pipe 3 and fixed with bolts to complete the replacement of the shielding component 6.

[0047] Example 2, as Figures 1 to 6 As shown, this embodiment is used for 200g starch packaging, specifically as follows:

[0048] In Example 2, starch is a usable product with high safety requirements. Therefore, silica gel is silica-based. Silica-based silica gel is an inorganic polymer silica gel material formed by the condensation of silicic acid. It is non-toxic, odorless, stable, and has no harmful effects on the human body. However, silica-based silica gel is more expensive than silica-based silica gel. Silica-based silica gel is synthesized with silica as a synthetic material and is prone to releasing harmful substances. Therefore, silica-based silica gel is used when there are certain requirements for product quality. For materials such as quicklime, where product quality requirements are not strict during packaging, silica-based silica gel can be used.

[0049] For any implementation methods not mentioned in Example 2, they are the same as in Example 1, and will not be described in detail here.

[0050] Example 3, as Figures 1 to 6 As shown, this embodiment is used for packaging 200g of pyrethroid insecticides, as detailed below:

[0051] Pyrethroid insecticides and other pesticides are corrosive, and product quality directly affects their effectiveness. Therefore, platinum-cured silicone tubing is used for the shielding component 6 in the packaging of such powders. Platinum-cured silicone tubing uses high-molecular-weight linear polysiloxane as the base material, with the addition of some special components, and is then processed according to certain process requirements to prepare a rubber elastomer with certain strength and ductility. Platinum-cured silicone tubing has better corrosion resistance than silicone silicate, which can further ensure product quality. Therefore, platinum-cured silicone tubing is used for powders with high product quality requirements, although the price of platinum-cured silicone tubing is relatively higher than that of silicone silicate.

[0052] When preparing for packaging pesticide products, do not use an air gun to blow directly onto them. Instead, wipe them with a cloth to avoid blowing the material onto the workers and causing them harm.

[0053] For implementation methods not mentioned in Example 3, they are the same as in Example 1, and will not be described in detail here.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bag-feeding packaging machine, comprising a fixed frame (1), wherein a lifting device (2) is provided on the fixed frame (1), and a discharge pipe (3) having a discharge port and a hopper (4) having a feed port are connected to the lifting device (2); a bag-feeding device (14) for feeding packaging bags to the hopper (4) is provided on the fixed frame (1); a storage hopper (13) for providing materials to the hopper (4) is provided above the hopper (4) on the fixed frame (1); and the discharge pipe (3) is connected to the hopper (4), characterized in that, The hopper (4) is equipped with a blocking device to prevent dust floating inside the hopper (4) from falling to the outside of the packaging bag when the bag feeding device (14) transfers the packaging bag.

2. The bag-type packaging machine according to claim 1, characterized in that: The blocking device includes a rotating shaft (15) rotatably mounted on the discharge pipe (3) and multiple drive rods (5) fixedly mounted on the rotating shaft (15). The multiple drive rods (5) are connected to a blocking component (6). The blocking component (6) is an annular silicone sheet with a skirt structure. The skirt structure forms multiple sets of protrusions and recesses. The drive rods (5) and the blocking component (6) are connected to the outer wall of the recesses. The fixing frame (1) is provided with a drive assembly for driving the multiple drive rods (5) to rotate simultaneously along the center of the discharge pipe (3). The simultaneous rotation of the multiple drive rods (5) can cause the blocking component (6) to deform so that the ends of the blocking component (6) fit together to block the discharge port.

3. The bag-type packaging machine according to claim 2, characterized in that: The drive assembly includes a fixed seat (7) fixedly mounted on a fixed frame (1). The fixed seat (7) is provided with a plurality of racks (8) the same number as the drive rod (5). Each of the rotating shafts (15) is connected to a gear (9) that meshes with the rack (8).

4. The bag-type packaging machine according to claim 2, characterized in that: The discharge pipe (3) includes an installation cylinder (301) sleeved at the discharge port, and the diameter of the installation cylinder (301) is larger than the diameter of the discharge port. Multiple rotating shafts (15) are installed on the installation cylinder (301). The shielding component (6) is connected to an installation sleeve (10). The installation sleeve (10) is sleeved on the upper part of the discharge pipe (3), and the installation sleeve (10) is located between the installation cylinder (301) and the hopper (4). The thickness of the installation sleeve (10) is greater than the width of the gap between the installation cylinder (301) and the hopper (4).

5. A bag-type packaging machine according to claim 3, characterized in that: The gear (9) is a felt gear, and the rack (8) is a self-lubricating felt rack.

6. A bag-type packaging machine according to claim 2, characterized in that: The maximum rotation angle of the drive rod (5) is 100°-120°. When the drive rod (5) rotates to the maximum angle, the outer diameter of the recess can be deformed to be the same as the outer diameter of the protrusion. When the drive rod (5) rotates to the maximum angle, the width of the shielding component (6) is greater than the width of the packaging bag.

7. A bag-type packaging machine according to claim 6, characterized in that: The shielding component (6) is provided with a rubber sleeve on the outer wall of the recess. The clip (11) and the shielding component (6) form a channel. The channel is closed on the side away from the mounting sleeve (10), and the channel is interference-fitted with the drive rod (5).

8. A bag-type packaging machine according to claim 4, characterized in that: The fixed frame (1) is provided with a guide cylinder (12) that cooperates with the discharge pipe (3).

9. A bag-type packaging machine according to claim 8, characterized in that: A torsion spring is connected between the rotating shaft (15) and the mounting cylinder (301). The length of the rack (8) is less than the stroke of the hopper (4). During the upward movement of the hopper (4), the gear (9) and rack (8) disengage. After the gear (9) disengages from the rack (8), the drive rod (5) can rotate towards the center of the discharge pipe (3) under the action of the torsion spring.

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