An environmentally friendly powder packaging machine with anti-spillage function

By using components such as movable material pipes, electric telescopic rods, clamps, elastic capsules, suction pipes and air ducts in the powder packaging machine, the problem of overflowing is easily caused by filling the powder packaging machine, and the effective filling and anti-spill effect of powder is achieved.

CN119872985BActive Publication Date: 2025-06-13CHANGZHOU LEMAR INTELLIGENT EQUIP TECH CO LTD
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Patent Information

Application Number
CN202510368821.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-27
Publication Date
2025-06-13
Estimated Expiration
2045-03-27

AI Technical Summary

Technical Problem

Existing powder packaging machines are prone to powder overflow during filling.

Method used

An environmentally friendly powder packaging machine that is anti-spill is designed, using components such as movable material pipes, electric telescopic rods, clamps, elastic capsules, suction pipes and air ducts. The bag mouth is sealed through the clamps, and the bag body is expanded by the gas transmission component to prevent the powder from overflowing, and further improve the anti-spill effect through the filter component and the strike component.

Benefits of technology

It effectively avoids the overflow of powder during the packaging process, ensures the full filling of powder and the safety of the packaging process, and improves the efficiency of the packaging machine and environmental sanitation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses an environment-friendly powder packaging machine with anti-overflow function, belonging to the technical field of packaging machines. The present invention includes a machine base installed in a workshop, and a hopper is fixedly installed at the upper end of the machine base, and a fixed material pipe is fixedly connected to the lower end of the hopper; the lower end of the fixed material pipe is connected to a movable material pipe through a telescopic pipe, and a first frame body and a second frame body are fixedly installed inside the machine base, and an electric telescopic rod is fixedly installed on the first frame body, and the output end of the electric telescopic rod is fixedly connected to a first movable plate, and a second movable plate is elastically connected below the first movable plate, and a clamping member for clamping the bag mouth is elastically and rotatably installed on the lower surface of the first movable plate. The environment-friendly powder packaging machine with anti-overflow function can assist the bag body to expand and bulge to ensure effective loading of the powder material, and can extract and recycle the powder material during the packaging process, effectively avoiding powder overflow.
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Description

Technical Field

[0001] The present invention relates to the technical field of packaging machines, and specifically to an environment-friendly powder packaging machine that prevents overflow and dispersion. Background Art

[0002] Powder packaging is widely used in many industries such as chemical engineering, food, medicine, and building materials. Accurately, efficiently, and hygienically packaging powder materials is an important link in the production process. Powder is packaged in bags through a packaging machine, but there are still some deficiencies in the existing powder packaging machines during use.

[0003] The prior art (Chinese patent with application number: 202311028505.4 and application date: August 16, 2023) discloses an automatic powder quantitative servo weighing packaging machine and a feeding and weighing control method, which relates to the field of servo weighing packaging machines. A speed-regulating hopper is fixedly installed on a supporting top plate. A servo motor is arranged on one side of the speed-regulating hopper. A feeding electric control valve is arranged in the speed-regulating hopper. The servo motor is drivingly connected to the feeding electric control valve. A bag-clamping feeding bin is arranged below the supporting top plate. 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 feeding bin. A set of bag-clamping arms is arranged at both positions on both sides of the bag-clamping feeding bin. A cylinder assembly is arranged between two bag-clamping arms in the same group. The lower ends of two bag-clamping arms in the same group are provided with mutually cooperating bag-clamping plates. When the weighed weight reaches the standard, 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 feeding rate; the prior art (Chinese patent with application number: 202222627426.2 and application date: October 7, 2022) discloses a composite flocculant packaging machine, which relates to the technical field of composite flocculant packaging. It includes a packaging machine body installed at the top end of a base, a control end installed on one side of the packaging machine body, a feeding hopper installed at the top end of the packaging machine body, and a feeding pipe installed at the bottom end of the feeding hopper. Through the operation of a second cylinder, the bag mouth can be moved to the bottom end of the feeding pipe. Through the action of a first cylinder, the clamping plate can pass through a through groove to clamp the bag mouth, so as to facilitate feeding. After feeding is completed, through the operation of a servo motor, the packaging bag filled with the composite flocculant can be moved to one side through a mounting plate and a threaded pipe, etc., preventing manual handling by personnel, which may cause dust to be inhaled by personnel and have a certain impact on the physical health of personnel. At the same time, after the packaging bag filled with the composite flocculant is removed, the packaging bag without the composite flocculant on the other side of the top end of the connecting plate will move to the bottom end of the feeding pipe for loading.

[0004] During use, the existing powder packaging machine can clamp and fix the bag opening to ensure the effective collection and packaging of subsequent powder materials. However, when the bag opening is clamped, the bag body cannot be fully expanded and unfolded, so that the deflated bag body cannot fully contain the material, and the top of the filled powder is too close to the bag opening, which may easily cause dust to overflow, and there are certain usage defects. Summary of the invention

[0005] The object of the present invention is to provide an environmentally friendly powder packaging machine that prevents spillage, so as to solve the problem raised by the above background technology that powder packaging machines currently on the market are prone to powder spillage during filling.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-spillage environmentally friendly powder packaging machine, comprising a machine base installed in a workshop, a hopper is fixedly installed on the upper end of the machine base, and a fixed material pipe is fixedly connected to the lower end of the hopper; the lower end of the fixed material pipe is connected to a movable material pipe through a telescopic tube, and a first frame and a second frame are fixedly installed on the inner side of the machine base, and an electric telescopic rod is fixedly installed on the first frame, and the output end of the electric telescopic rod is fixedly connected to a first movable plate, and at the same time, a second movable plate is elastically connected below the first movable plate, a clamping piece for clamping the bag mouth is elastically rotatably installed on the lower surface of the first movable plate, and an air supply component for preventing powder from spilling is connected between the first movable plate and the second movable plate, a filtering component for filtering out recovered powder is fixedly installed on the first frame, and a knocking piece for knocking the movable material pipe is also installed on the first movable plate.

[0007] Preferably, a conveyor for conveying bags is installed on the machine base, and the conveyor evenly conveys vertically placed open bags, and the bags are conveyed to just below the movable material pipe through the conveyor.

[0008] Preferably, a spring is fixedly connected between the first movable plate and the second movable plate, and the electric telescopic rod drives the second movable plate to move downward synchronously when pushing the first movable plate downward, and the second movable plate is fixedly connected to the outer side of the movable material tube, and the first movable plate is slidably sleeved on the outer side of the telescopic tube and the movable material tube.

[0009] Preferably, a pull rope is wound around the shaft of the clamp, and the upper end of the pull rope is fixedly connected to the outer side of the first frame, and the clamp is elastically rotated by pulling the pull rope during the downward movement of the second movable plate, and the clamp cooperates with the movable material pipe to clamp and seal the bag opening during the rotation process.

[0010] Preferably, vertically arranged guide posts are symmetrically and fixedly installed on the second movable plate, and the guide posts slidably penetrate through the first movable plate. The air delivery assembly includes an elastic bladder sleeved outside the guide posts, and the elastic bladder is fixedly connected between the first movable plate and the second movable plate. During the relative movement of the first movable plate and the second movable plate, the elastic bladder is squeezed and stretched.

[0011] Preferably, the air delivery assembly includes an air suction pipe and an exhaust pipe connected to the outside of the elastic bladder, and one-way valve structures are arranged on the inner sides of both the air suction pipe and the exhaust pipe.

[0012] Preferably, a limiting frame is fixedly installed on the outside of the second frame body, and the limiting frame is located on the movement path of the second movable plate. The limiting frame supports the second movable plate during its downward movement. At the same time, the lower end of the limiting frame is fixedly connected to an air duct, and the air duct is connected to the exhaust pipe. The air outlet of the air duct faces both sides of the bag body, and the bag body bulges under the action of the air pressure difference generated by the blowing of the air duct.

[0013] Preferably, the filtering assembly includes a filtering cylinder fixedly installed on the first frame body, a filter screen is installed inside the filtering cylinder, the lower end of the filtering cylinder is connected to the air suction pipe, and a purification pipe is connected between the upper end of the filtering cylinder and the fixed material pipe.

[0014] Preferably, the knocking member is elastically rotatably connected to the second movable plate. The knocking end of the knocking member is initially attached to the outside of the movable material pipe. A magnetic sheet is fixedly installed on the outside of the knocking member. A magnetic block is fixedly installed at the lower end of the first movable plate. When the first movable plate and the second movable plate approach each other, the magnetic block approaches the magnetic sheet, and the magnetic poles of the opposite faces of the magnetic block and the magnetic sheet are the same. At the same time, the knocking member elastically rotates under the magnetic force of the magnetic block and the magnetic sheet.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The anti-spill environmental protection powder packaging machine can assist the bag body to expand and bulge to ensure effective loading of the powder material, and can extract and recycle the powder material during the packaging process, effectively avoiding powder spillage. The specific contents are as follows: 1. An activity material pipe, an electric telescopic rod, and a clamping member are provided. As the electric telescopic rod drives the first movable plate and the second movable plate to move downward, the activity material pipe can be directly inserted into the bag mouth of the corresponding bag body. At the same time, the clamping member will elastically rotate under the pulling of the pull rope, so that the clamping member can cooperate with the activity material pipe to automatically clamp and seal the bag mouth of the bag body, avoiding powder scattering during the blanking process.

[0016] 2. An elastic bladder, an air suction pipe and an air duct are provided. As the first movable plate and the second movable plate approach each other, they can squeeze the elastic bladder, so that the air inhaled into the elastic bladder can enter the air duct through the exhaust pipe, and then be evenly blown to both sides of the bag through the air duct, thereby accelerating the air flow rate and reducing the air pressure on both sides of the bag, so that the bag expands and bulges automatically, which is convenient for filling the powder fully and avoids the possibility of the powder spilling due to being too close to the bag mouth after filling.

[0017] 3. A filter cylinder and a knocking member are provided. As the elastic bladder stretches, it can extract the air at the top of the packaging bag through the air suction pipe and the purification pipe, so as to remove the powder floating near the bag mouth, and the powder can be filtered out and collected through the filter cylinder. At the same time, during the reset process of the knocking member, it can knock the movable material pipe, so that the movable material pipe vibrates and discharges the residual powder adhering to the inner wall, thereby further improving the anti-spill effect of the powder of the device. Description of the Drawings

[0018] Figure 1 It is a front view structural schematic diagram of the first embodiment of the present invention;

[0019] Figure 2 It is an installation structural schematic diagram of the first movable plate and the second movable plate of the present invention;

[0020] Figure 3 It is an installation structural schematic diagram of the clamping member and the air duct of the present invention;

[0021] Figure 4 It is a front view structural schematic diagram of the second embodiment of the present invention;

[0022] Figure 5 It is an installation structural schematic diagram of the filter cylinder of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged structural schematic diagram at A in;

[0024] Figure 7 It is an installation structural schematic diagram of the knocking member of the present invention;

[0025] Figure 8 It is an installation structural schematic diagram of the elastic bladder, the air duct and the filter cylinder of the present invention.

[0026] In the figure: 1. base; 2. conveyor; 3. hopper; 4. fixed material pipe; 5. first frame; 6. second frame; 7. telescopic tube; 8. movable material pipe; 9. electric telescopic rod; 10. first movable plate; 11. second movable plate; 12. spring; 13. guide column; 14. clamping member; 15. pull rope; 16. limit frame; 17. elastic capsule; 18. suction pipe; 19. air duct; 20. exhaust pipe; 21. filter cartridge; 22. filter screen; 23. purification pipe; 24. magnetic block; 25. knocking member; 26. magnetic sheet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-3 As shown, the existing powder packaging machine can only clamp and seal the bag mouth during the packaging process, but it is inconvenient to expand and fix the bag body before unloading, so that the bag body filling space is limited, the powder cannot be fully filled, and the upper end of the powder is too close to the bag mouth, which affects the subsequent packaging. In order to solve this technical problem, this embodiment discloses the following technical content: an anti-spillage environmentally friendly powder packaging machine, including a machine base 1 installed in a workshop, a hopper 3 is fixedly installed on the upper end of the machine base 1, and a fixed material pipe 4 is fixedly connected to the lower end of the hopper 3;

[0029] The lower end of the fixed material pipe 4 is connected to the movable material pipe 8 through the telescopic tube 7, and the first frame 5 and the second frame 6 are fixedly installed on the inner side of the machine base 1, and the first frame 5 is fixedly installed with an electric telescopic rod 9, and the output end of the electric telescopic rod 9 is fixedly connected with a first movable plate 10, and at the same time, the lower part of the first movable plate 10 is elastically connected with a second movable plate 11, and the lower surface of the first movable plate 10 is elastically rotatably installed with a clamping member 14 for clamping the bag mouth, and an air supply component for preventing powder from spilling is connected between the first movable plate 10 and the second movable plate 11.

[0030] A conveyor 2 for conveying bags is installed on the machine base 1 , and the conveyor 2 evenly conveys vertically placed open bags, and the bags are conveyed to just below the movable material pipe 8 through the conveyor 2 .

[0031] A spring 12 is fixedly connected between the first movable plate 10 and the second movable plate 11. When the electric telescopic rod 9 pushes the first movable plate 10 downward, the second movable plate 11 is driven to move downward synchronously. The second movable plate 11 is fixedly connected to the outer side of the movable material pipe 8. At the same time, the first movable plate 10 is slidably sleeved on the outer sides of the telescopic pipe 7 and the movable material pipe 8.

[0032] A pull rope 15 is wound around the shaft portion of the clamping member 14. The upper end of the pull rope 15 is fixedly connected to the outer side of the first frame body 5. When the second movable plate 11 moves downward, the clamping member 14 is elastically rotated by the pull rope 15. During the rotation of the clamping member 14, the bag mouth is clamped and sealed in cooperation with the movable material pipe 8.

[0033] Vertically arranged guide posts 13 are symmetrically and fixedly installed on the second movable plate 11. The guide posts 13 slidably penetrate through the first movable plate 10. The air delivery assembly includes an elastic capsule 17 sleeved on the outer side of the guide posts 13. The elastic capsule 17 is fixedly connected between the first movable plate 10 and the second movable plate 11. During the relative movement of the first movable plate 10 and the second movable plate 11, the elastic capsule 17 is squeezed and stretched. The air delivery assembly includes an air suction pipe 18 and an exhaust pipe 20 connected to the outer side of the elastic capsule 17. One-way valve structures are arranged on the inner sides of both the air suction pipe 18 and the exhaust pipe 20. A limiting frame 16 is fixedly installed on the outer side of the second frame body 6. The limiting frame 16 is located on the movement path of the second movable plate 11. The limiting frame 16 supports the second movable plate 11 during its downward movement. At the same time, the lower end of the limiting frame 16 is fixedly connected to an air duct 19. The air duct 19 is connected to the exhaust pipe 20. The air outlet of the air duct 19 faces both sides of the bag body. The bag body bulges under the action of the air pressure difference generated by the blowing of the air duct 19.

[0034] By adopting the above technical solution, after opening the bag mouth of the packaging bag, it is transported to the lower end of the movable material pipe 8, and then the electric telescopic rod 9 is controlled to push the first movable plate 10 downward. At this time, the first movable plate 10 will drive the second movable plate 11 to move downward synchronously through the spring 12. At this time, the second movable plate 11 can drive the movable material pipe 8 to insert into the inner side of the bag mouth. At the same time, the pull rope 15 will pull the two clamping members 14 to rotate elastically, so that the clamping members 14 can cooperate with the lower end of the movable material pipe 8 to clamp and seal the bag mouth between the two, avoiding the powder from drifting during the powder feeding process. When the second movable plate 11 stops moving when it contacts the limit frame 16 during the downward movement, at this time, the electric telescopic rod 9 is continuously controlled to push the first movable plate 10. At this time, the first movable plate 10 will move elastically with the second movable plate 11, so that the first movable plate 10 and the second movable plate 11 squeeze the elastic capsule 17, so that the air inhaled by the elastic capsule 17 enters the air duct 19 through the exhaust pipe 20, so that the air duct 19 can blow air on both sides of the packaging bag, so that the air flow rate on both sides of the packaging bag becomes larger, resulting in a pressure difference inside and outside the packaging bag, so that the packaging bag automatically expands and bulges. Subsequently, the control valve at the lower end of the hopper 3 is controlled to realize the feeding of the powder, and the powder enters the packaging bag through the fixed material pipe 4, the telescopic pipe 7 and the movable material pipe 8.

[0035] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above Embodiment 1. After the existing powder packaging machine finishes feeding, the powder near the bag mouth is easy to float, which is easy to cause powder overflow and affect the processing environment. In order to further solve this technical problem, the following technical content is disclosed in this embodiment, as Figures 4-8 shown; A filtering component for filtering and recovering powder is fixedly installed on the first frame body 5, and a knocking member 25 for knocking the movable material pipe 8 is also installed on the first movable plate 10. The filtering component includes a filtering cylinder 21 fixedly installed on the first frame body 5, and a filter screen 22 is installed inside the filtering cylinder 21. And the lower end of the filtering cylinder 21 is connected to the suction pipe 18, and at the same time, a purification pipe 23 is connected between the upper end of the filtering cylinder 21 and the fixed material pipe 4. The knocking member 25 is elastically rotatably connected to the second movable plate 11, and the knocking end of the knocking member 25 is initially attached to the outer side of the movable material pipe 8. And a magnetic sheet 26 is fixedly installed on the outer side of the knocking member 25. A magnetic block 24 is fixedly installed at the lower end of the first movable plate 10. When the first movable plate 10 and the second movable plate 11 approach each other, the magnetic block 24 approaches the magnetic sheet 26, and the magnetic poles of the opposite surfaces of the magnetic block 24 and the magnetic sheet 26 are the same. At the same time, the knocking member 25 rotates elastically under the magnetic force of the magnetic block 24 and the magnetic sheet 26.

[0036] By adopting the above technical solution, after the powder filling is completed, the electric telescopic rod 9 is controlled to drive the first movable plate 10 to move upward. At this time, the first movable plate 10 and the second movable plate 11 will stretch the elastic capsule 17, so that it extracts the air in the filter cartridge 21 through the air suction pipe 18, and the filter cartridge 21 extracts the powder near the lower end of the movable material pipe 8 and the bag mouth of the packaging bag through the purification pipe 23. At this time, the bag mouth of the packaging bag will automatically fit due to the decrease in air pressure, thus effectively reducing the powder spillage effect. When the first movable plate 10 and the second movable plate 11 approach each other, the magnet 24 will gradually approach the magnetic sheet 26 outside the knocking member 25, so that the knocking member 25 rotates elastically under the action of magnetic force. When the first movable plate 10 moves upward, the knocking member 25 will lose the magnetic force and rotate elastically, so that the knocking member 25 can knock and vibrate the movable material pipe 8, promoting the discharge of the residual powder adhering to the inner wall of the movable material pipe 8, so as to facilitate the treatment together with the powder spilled in the packaging bag.

[0037] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-spillage and environment-friendly powder packaging machine, comprising a machine base (1) installed in a workshop, a hopper (3) being fixedly installed at the upper end of the machine base (1), and a fixed material pipe (4) being fixedly connected to the lower end of the hopper (3); It is characterized in that The lower end of the fixed material pipe (4) is connected to the movable material pipe (8) through a telescopic tube (7), and a first frame (5) and a second frame (6) are fixedly installed on the inner side of the machine base (1), and an electric telescopic rod (9) is fixedly installed on the first frame (5), and the output end of the electric telescopic rod (9) is fixedly connected to a first movable plate (10), and a second movable plate (11) is elastically connected to the lower side of the first movable plate (10), and a lower surface of the first movable plate (10) is elastically rotatably installed with a bag clamping mechanism. The first movable plate (10) and the second movable plate (11) are provided with a clamping member (14) for opening the first movable plate (10), and a gas supply assembly for preventing powder from scattering is connected between the first movable plate (10) and the second movable plate (11). A filtering assembly for filtering out recovered powder is fixedly mounted on the first frame (5), and a knocking member (25) for knocking the movable material pipe (8) is also mounted on the first movable plate (10). A vertically arranged guide column (13) is symmetrically fixedly mounted on the second movable plate (11), and the guide column (13) slides through the first movable plate (10). The gas supply assembly The component comprises an elastic sac (17) sleeved on the outside of the guide column (13), and the elastic sac (17) is fixedly connected between the first movable plate (10) and the second movable plate (11), and the elastic sac (17) is squeezed and stretched during the relative movement of the first movable plate (10) and the second movable plate (11), and the air delivery component comprises an air intake pipe (18) and an air exhaust pipe (20) connected to the outside of the elastic sac (17), and the air intake pipe (18) and the air exhaust pipe (20) are both provided with a one-way valve structure on the inside A limiting frame (16) is fixedly installed on the outer side of the second frame (6), and the limiting frame (16) is located on the movement path of the second movable plate (11), and the limiting frame (16) supports the second movable plate (11) during the downward movement. At the same time, the lower end of the limiting frame (16) is fixedly connected to an air duct (19), and the air duct (19) is connected to an exhaust pipe (20), the air outlet of the air duct (19) faces the two sides of the bag body, and the bag body bulges under the action of the air pressure difference generated by the air blowing from the air duct (19).

2. The anti-spillage and environmentally friendly powder packaging machine according to claim 1, characterized in that: A conveyor (2) for conveying bags is installed on the machine base (1), and the conveyor (2) evenly conveys vertically placed open bags, and the bags are conveyed to the bottom of the movable material pipe (8) through the conveyor (2).

3. The anti-spillage and environmentally friendly powder packaging machine according to claim 1, characterized in that: A spring (12) is fixedly connected between the first movable plate (10) and the second movable plate (11), and the electric telescopic rod (9) drives the second movable plate (11) to move downward synchronously when the first movable plate (10) is pushed downward, and the second movable plate (11) is fixedly connected to the outer side of the movable material pipe (8), and the first movable plate (10) is slidably sleeved on the outer sides of the telescopic tube (7) and the movable material pipe (8).

4. The anti-spillage and environmentally friendly powder packaging machine according to claim 1, characterized in that: A drawstring (15) is wound around the shaft of the clamping member (14), and the upper end of the drawstring (15) is fixedly connected to the outer side of the first frame (5). When the second movable plate (11) moves downward, the drawstring (15) pulls the clamping member (14) to rotate elastically. During the rotation of the clamping member (14), the movable material pipe (8) is used to clamp and seal the bag opening.

5. The anti-spillage and environmentally friendly powder packaging machine according to claim 1, characterized in that: The filter assembly comprises a filter cartridge (21) fixedly mounted on a first frame (5), a filter screen (22) being mounted on the inner side of the filter cartridge (21), and a lower end of the filter cartridge (21) being connected to an air intake pipe (18), while a purification pipe (23) is connected between an upper end of the filter cartridge (21) and a fixed material pipe (4).

6. The anti-spillage and environmentally friendly powder packaging machine according to claim 1, characterized in that: The knocking piece (25) is elastically rotatably connected to the second movable plate (11), and the knocking end of the knocking piece (25) is initially attached to the outer side of the movable material tube (8), and a magnetic sheet (26) is fixedly installed on the outer side of the knocking piece (25), and a magnetic block (24) is fixedly installed on the lower end of the first movable plate (10), and when the first movable plate (10) and the second movable plate (11) are close to each other, the magnetic block (24) approaches the magnetic sheet (26), and the magnetic poles of the opposite surfaces of the magnetic block (24) and the magnetic sheet (26) are the same, and at the same time, the knocking piece (25) is elastically rotated under the magnetic force of both the magnetic block (24) and the magnetic sheet (26).

Citation Information

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