Automatic paperboard feeding device

Abstract

The application relates to a paper box production equipment field, in particular to a paperboard automatic feeding device, which comprises a feeding mechanism, the bottom of the falling paperboard is pushed by a pushing piece, the falling paperboard is pushed over to the feeding mechanism, the degree of automation is improved, and the production efficiency is improved; due to the friction force between the adjacent paperboards, part of the paperboards is suspended in the air when falling in the vertical direction static friction with the front and rear paperboards; when the pushing piece pushes over the front paperboard, the part of the paperboard loses the friction force and falls to the upper side of the supporting strip and keeps the vertical state; in the retracting process of the turning-over mechanism, the rear side of the pushing piece abuts against the front side of the frontmost paperboard, then the pushing piece is turned over downward along the hinge joint of the inclined block and the U-shaped block in the continuous retracting process, then passes through the lower side of the part of the paperboard, and the pushing piece is turned over upward and reset by the pulling force of the tension spring after passing through the part of the paperboard, so that the paperboard is prevented from being pressed and bent, and the production reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of cardboard box production equipment, and more particularly to an automatic cardboard feeding device. Background Technology

[0002] Corrugated cardboard is widely used as the main raw material for carton production due to its high mechanical strength and ability to withstand collisions and drops during handling. After the corrugated cardboard is produced, it needs to be turned over and printed on the back. Nowadays, most corrugated cardboard uses anti-wrinkle thickened cardboard, which has a greater weight.

[0003] Currently, there are roughly two methods for feeding anti-wrinkle thickened cardboard. One is a semi-automatic method, where a feeding machine raises the cardboard stack (i.e., several cardboards stacked to a certain height) to a certain height, and then the cardboards are manually placed onto the feeding mechanism in batches. This method increases labor intensity, has a low degree of automation, and reduces production efficiency. The other method uses a flipping mechanism to flip the cardboard stack upwards, thereby raising the cardboards to a certain height and changing them from a horizontal to a vertical position. Then, the cardboard stack is pushed forward a certain distance, causing a certain number of cardboards in the front of the stack to descend from the current support position to another support position, creating a height difference. This causes the bottom of the descending cardboard to bulge downwards beyond the bottom of the undescended cardboard, and the pusher blocks push the bottom of the undescended cardboard. The pusher extends horizontally forward, pushing the bottom of the descending cardboard and pushing it onto the feeding mechanism. This process is repeated to achieve batch feeding. However, due to the friction between adjacent cardboards, some cardboards suspend in the air due to static friction in the vertical direction with the cardboards on the front and back sides as they descend. When the pusher pushes the cardboard on the front side, this part of the cardboard loses friction and descends to the upper side of the pusher. As the pusher continues to move forward, this part of the cardboard generates static friction in the horizontal direction with the upper side of the pusher. This static friction causes this part of the cardboard to tilt. After the pusher retracts, this part of the cardboard rests at the front end of the cardboard stack in an tilted state. When the cardboard stack continues to move forward, this part of the cardboard is easily bent, reducing production reliability. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an automatic cardboard feeding device that improves the degree of automation, production efficiency and production reliability.

[0005] The technical solution adopted in this invention is as follows:

[0006] An automatic cardboard feeding device includes a feeding mechanism and a pushing mechanism at the rear of the feeding mechanism. The pushing mechanism includes a support platform, a pushing frame disposed above the support platform, and a first rotary transmission chain symmetrically connected to both sides of the bottom of the pushing frame. The first rotary transmission chain protrudes forward from the support platform, and upright plates are symmetrically disposed on both sides of it. A support bar is disposed on the top of the upright plates. A flipping mechanism is disposed at the bottom of the side of the support platform near the feeding mechanism. The flipping mechanism includes a pushing plate, a pushing block, a tension spring, and a fourth pushing rod. The pushing block movably abuts against the rear side of the pushing plate. The fourth pushing rod is connected to the end of the pushing block away from the pushing plate. A U-shaped block is connected to the bottom of the pushing plate. An inclined block is connected to the lower side of the pushing block. The inclined block is hinged to the U-shaped block. One end of the tension spring is connected to one side of the pushing block, and the other end is connected to one side of the pushing plate. The height of the pushing plate and the support platform is higher than the support bar, and the height of the pushing block is lower than the support bar.

[0007] Preferably, the feeding mechanism includes a first frame, a first motor, a first rotary drive shaft, and a first rotary feeding belt that is connected to the first rotary drive shaft. Several first rotary feeding belts are evenly arranged. The first rotary drive shaft is mounted on the first frame, and one end of it is connected to the output end of the first motor.

[0008] Preferably, the feeding mechanism further includes an inclined feeding assembly, which includes a second rotary feeding belt, a bracket, and a first push rod. A protrusion is connected to the lower side of the bracket. The output end of the first push rod is hinged to the protrusion, and its other end is hinged to the first frame. A drive wheel is driven to the inner side of one end of the second rotary feeding belt, and a driven wheel is driven to the inner side of the other end. The drive wheel is fixedly connected to the first rotary drive shaft. One end of the bracket near the support platform is rotatably connected to the driven wheel, and its other end is rotatably connected to the first rotary drive shaft through a bearing.

[0009] Preferably, a second rotary transmission chain is provided below the support platform. The second rotary transmission chain protrudes forward from the support platform. Several support plates are evenly arranged on the outer side of the second rotary transmission chain. The height of the support plates is higher than that of the support bars. The height of the pusher plate and the support platform are both higher than that of the support plates.

[0010] Preferably, the material turning mechanism has two sets and is symmetrically arranged on both sides of the second rotary transmission chain.

[0011] Preferably, the feeding mechanism further includes a second rotary drive shaft and a second motor that is driven by the second rotary drive shaft, and both the second rotary transmission chain and the first rotary transmission chain are driven by the second rotary drive shaft.

[0012] Preferably, the support bar has a groove on the side near the first rotary transmission chain, and a slider is connected to the bottom of the pusher frame, with the slider slidably connected to the groove.

[0013] Preferably, it also includes a feeding platform. The feeding mechanism is provided on the side near the feeding platform with a flipping mechanism for flipping the pushing mechanism. The pushing frame includes a main frame and supporting rods symmetrically connected to the top two sides of the main frame. There are three feeding platforms. There is a clearance groove between two adjacent feeding platforms that corresponds to one supporting rod.

[0014] Preferably, the flipping mechanism includes a second frame, a second push rod, a third push rod, a first flipping frame, and a second flipping frame. The first flipping frame is hinged to the top of the second frame, and its side near the second frame is hinged to the output end of the second push rod. The other end of the second push rod is hinged to the bottom of the second frame. The second flipping frame is hinged to the top of the first flipping frame. The output end of the third push rod is hinged to the side of the second flipping frame near the first flipping frame, and its other end is hinged to the side of the first flipping frame away from the second push rod. The material pushing mechanism is mounted on the second flipping frame.

[0015] Preferably, the material platform includes a feeding frame and feeding rollers, with the feeding rollers rotatably connected to the feeding frame and several of them evenly arranged.

[0016] The beneficial effects of this invention are as follows:

[0017] This automatic cardboard feeding device uses a pusher to move multiple cardboards forward a certain distance, causing a certain number of cardboards in front to descend from the support platform to the support bars, creating a height difference. This causes the bottom of the descending cardboard to bulge downwards beyond the bottom of the undescended cardboard. A tipping mechanism extends horizontally forward from below the undescended cardboard, pushing the bottom of the descending cardboard onto the feeding mechanism via a pusher plate. This improves automation and production efficiency. Due to friction between adjacent cardboards, some cardboard descends perpendicularly to the cardboards on either side. Suspended in the air by static friction in the direction of the paperboard, when the pusher pushes the front cardboard over, this part of the cardboard loses friction and falls to the upper side of the support bar and remains upright. During the retraction of the flipping mechanism, the rear side of the pusher abuts against the front side of the frontmost piece of cardboard in this part. Then, during the continued retraction, the pusher flips downward along the hinge point of the inclined block and the U-shaped block, and then passes under the cardboard. After passing the cardboard, the tension of the tension spring causes the pusher to flip upward and reset, preventing the cardboard from being bent and improving production reliability. Attached Figure Description

[0018] Figure 1 This is a first perspective view of an automatic cardboard feeding device.

[0019] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0020] Figure 3 This is a second perspective view of an automatic cardboard feeding device.

[0021] Figure 4 for Figure 3 Enlarged diagram of point B in the middle.

[0022] Figure 5 This is a front view of an automatic cardboard feeding device.

[0023] Figure 6 for Figure 5 Enlarged diagram of point C in the middle.

[0024] Figure 7 This is a schematic diagram of the feeding mechanism.

[0025] Figure 8 This is a schematic diagram of the material turning mechanism.

[0026] Figure 9 This is a right view of an automatic cardboard feeding device.

[0027] In the diagram: 1. Feeding mechanism; 101. First frame; 102. First motor; 103. First rotary drive shaft; 104. First rotary feed belt; 105. Second rotary feed belt; 106. Support; 107. First push rod; 108. Protrusion; 109. Drive wheel; 110. Driven wheel; 2. Pushing mechanism; 201. Support platform; 202. Pushing frame; 2021. Main frame; 2022. Support rod; 203. First rotary transmission chain; 204. Vertical plate; 205. Support bar; 206. Second rotary transmission chain 207. Chain; 208. Support plate; 209. Second rotary drive shaft; 210. Second motor; 211. Slide rail; 212. Slider; 3. Turning mechanism; 301. Pusher plate; 302. Push block; 303. Tension spring; 304. C-shaped block; 305. Inclined block; 306. Fourth push rod; 4. Loading platform; 401. Loading frame; 402. Feeding roller; 5. Turning mechanism; 501. Second frame; 502. Second push rod; 503. Third push rod; 504. First turning frame; 505. Second turning frame; 6. Clearance groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-9This invention provides a technical solution: an automatic cardboard feeding device, including a feeding mechanism 1, a pushing mechanism 2 provided at the rear of the feeding mechanism 1, the pushing mechanism 2 including a support platform 201, a pushing frame 202 disposed above the support platform 201, and a first rotary transmission chain 203 symmetrically connected to the bottom sides of the pushing frame 202, the first rotary transmission chain 203 protruding forward from the support platform 201, and having upright plates 204 symmetrically disposed on both sides thereon, the top of the upright plates 204 being provided with a support strip 205, and a flipping mechanism 3 provided at the bottom of the side of the support platform 201 near the feeding mechanism 1, the flipping mechanism 3 including a pushing plate 301. The push block 302, tension spring 303, and fourth push rod 306 are connected. The push block 302 is in movable contact with the rear side of the push plate 301. The fourth push rod 306 is connected to the end of the push block 302 away from the push plate 301. A U-shaped block 304 is connected to the bottom of the push plate 301. An inclined block 305 is connected to the lower side of the push block 302. The inclined block 305 is hinged to the U-shaped block 304. One end of the tension spring 303 is connected to one side of the push block 302, and the other end is connected to one side of the push plate 301. The height of the push plate 301 and the support platform 201 is higher than that of the support bar 205, and the height of the push block 302 is lower than that of the support bar 205.

[0030] Multiple cardboard pieces are placed on the support platform 201. The first rotary transmission chain 203 is driven to rotate, which in turn moves the pusher frame 202 forward. The pusher frame 202 pushes the cardboard pieces forward a certain distance, causing a certain number of cardboard pieces in front to fall from the support platform 201 onto the support bar 205. This creates a height difference between the cardboard pieces behind and those on the support platform 201, causing the bottom of the falling cardboard pieces to protrude downwards from the bottom of the unfallen cardboard pieces. The fourth push rod 306 pushes the push block 302 and the pusher plate 301 to extend horizontally forward from below the support platform 201. The pusher plate 301 then pushes the bottom of the falling cardboard pieces, pushing them onto the feeding mechanism 1. This improves automation and production efficiency. Due to friction between adjacent cardboard pieces, some cardboard pieces fall with... The front and rear cardboards are suspended in the air due to static friction in the vertical direction. When the pusher plate 301 pushes the front cardboard over, this part of the cardboard loses friction and falls onto the support bar 205. The support bar 205 supports this part of the cardboard and keeps it upright. During the process of the fourth push rod 306 driving the push block 302 and the pusher plate 301 to retract, the rear side of the pusher plate 301 abuts against the front side of the frontmost piece of cardboard in this part. Then, during the continued retraction, the pusher plate 301 flips downward along the hinge point of the inclined block 305 and the U-shaped block 304, and then passes under the cardboard. After passing the cardboard, the tension of the tension spring 303 causes the pusher plate 301 to flip upward and reset, preventing the cardboard from being bent and improving production reliability.

[0031] To facilitate the conveying of cardboard, in this embodiment, preferably, the feeding mechanism 1 includes a first frame 101, a first motor 102, a first rotary drive shaft 103, and a first rotary feeding belt 104 that is connected to the first rotary drive shaft 103. Several first rotary feeding belts 104 are evenly arranged. The first rotary drive shaft 103 is mounted on the first frame 101, and one end of it is connected to the output end of the first motor 102. The purpose is to push the cardboard onto the first rotary feeding belt 104 in batches by the flipping mechanism 3. The first motor 102 drives the first rotary feeding belt 104 to rotate through the first rotary drive shaft 103, thereby realizing the conveying of the cardboard in batches.

[0032] To facilitate the conveying of overturned cardboard and improve conveying reliability, in this embodiment, preferably, the feeding mechanism 1 further includes an inclined feeding assembly. The inclined feeding assembly includes a second rotary feeding belt 105, a support 106, and a first push rod 107. A protrusion 108 is connected to the lower side of the support 106. The output end of the first push rod 107 is hinged to the protrusion 108, and its other end is hinged to the first frame 101. A drive wheel 109 is driven to the inner side of one end of the second rotary feeding belt 105, and a driven wheel 110 is driven to the inner side of its other end. The drive wheel 109 is fixed. Connected to the first rotary drive shaft 103, one end of the bracket 106 near the support platform 201 is rotatably connected to the driven wheel 110, and the other end is rotatably connected to the first rotary drive shaft 103 via a bearing. The purpose is that while the turning mechanism 3 overturns multiple cardboards into an inclined state, the rear end of the bracket 106 is driven to swing upward by the first push rod 107, thereby changing the second rotary feed belt 105 from a horizontal state to an inclined state, parallel to the overturned cardboard, increasing the contact surface with the cardboard, thereby increasing the friction force to drive the cardboard for conveying, and improving the reliability of conveying.

[0033] To improve the smoothness of material feeding, in this embodiment, preferably, a second rotary transmission chain 206 is provided below the support platform 201. The second rotary transmission chain 206 protrudes forward from the support platform 201. Several support plates 207 are evenly arranged on the outer side of the second rotary transmission chain 206. The height of the support plates 207 is higher than that of the support bars 205. The heights of the pusher plate 301 and the support platform 201 are both higher than that of the support plates 207. The purpose is that when the pusher frame 202 pushes multiple cardboards forward a certain distance, a certain number of cardboards fall from the support platform 201 onto the support plates 207. The support plates 207 then replace the support bars 205 to support these cardboards and keep them upright. Because the second rotary transmission chain 206 does not rotate synchronously with the first rotary transmission chain 203, that is, when the pusher frame 202 pushes multiple cardboards forward, the support plates 207 move forward synchronously. Therefore, these cardboards will not generate friction with the support plates 207, thereby improving the smoothness of material feeding.

[0034] To improve the reliability of cardboard overturning, in this embodiment, preferably, two sets of flipping mechanisms 3 are provided and symmetrically arranged on both sides of the second rotary transmission chain 206. The purpose is to provide two sets of flipping mechanisms 3 so that the cardboard is subjected to uniform force when overturning, thereby improving the reliability of cardboard overturning.

[0035] To facilitate and improve the synchronization between the support plate 207 and the pusher 202, in this embodiment, preferably, the pusher mechanism 2 further includes a second rotary drive shaft 208 and a second motor 209 that is driven by the second rotary drive shaft 208. The second rotary transmission chain 206 and the first rotary transmission chain 203 are both driven by the second rotary drive shaft 208. The purpose is to drive the second rotary transmission chain 206 and the first rotary transmission chain 203 to rotate simultaneously by the second rotary drive shaft 208, so that when the pusher 202 moves forward, the support plate 207 can move forward synchronously, thereby improving the synchronization between the support plate 207 and the pusher 202.

[0036] To improve the reliability and stability of the pusher frame 202's movement, in this embodiment, preferably, the support bar 205 is provided with a groove 210 on the side near the first rotary transmission chain 203, and a slider 211 is connected to the bottom of the pusher frame 202. The slider 211 is slidably connected to the groove 210. The purpose is to make the slider 211 slide along the groove 210 while the first rotary transmission chain 203 drives the pusher frame 202 to move, thereby improving the reliability and stability of the pusher frame 202's movement.

[0037] To facilitate the upward flipping of the cardboard stack, raising the cardboard to a certain height and changing it from a horizontal to a vertical position, this embodiment preferably includes a loading platform 4. The feeding mechanism 1 is provided with a flipping mechanism 5 on the side near the loading platform 4 for flipping the pushing mechanism 2. The pushing frame 202 includes a main frame 2021 and supporting rods 2022 symmetrically connected to the top two sides of the main frame 2021. There are three loading platforms 4. Between two adjacent loading platforms 4, there is a clearance groove 6 corresponding to one supporting rod 2022. The purpose is to place two supporting rods 2022 into two clearance grooves 6 respectively before conveying. Then, the cardboard stack is placed on the upper side of the loading platform 4. The first rotary transmission chain 203 drives the pushing frame 202 to move upward, thereby lifting the cardboard stack through the supporting rods 2022. Then, the flipping mechanism 5 drives the pushing mechanism 2 and the cardboard stack to flip upward, raising the cardboard to a certain height and changing it from a horizontal to a vertical position.

[0038] To facilitate increasing the flipping angle, in this embodiment, preferably, the flipping mechanism 5 includes a second frame 501, a second push rod 502, a third push rod 503, a first flipping frame 504, and a second flipping frame 505. The first flipping frame 504 is hinged to the top of the second frame 501, and its side near the second frame 501 is hinged to the output end of the second push rod 502. The other end of the second push rod 502 is hinged to the bottom of the second frame 501. The second flipping frame 505 is hinged to the top of the first flipping frame 504. The output of the third push rod 503... One end of the pusher mechanism 2 is hinged to the side of the second tilting frame 505 near the first tilting frame 504, and the other end is hinged to the side of the first tilting frame 504 away from the second push rod 502. The pusher mechanism 2 is installed on the second tilting frame 505. Its purpose is to drive the first tilting frame 504 to rotate upward along the top of the second frame 501 by the second push rod 502, and then drive the second tilting frame 505 to rotate upward along the top of the first tilting frame 504 by the third push rod 503, thereby increasing the tilting angle and aligning the pusher mechanism 2 with the feeding mechanism 1.

[0039] In order to facilitate the movement of the cardboard stack to the top of the support rod 2022, in this embodiment, preferably, the loading platform 4 includes a loading frame 401 and a feeding roller 402. The feeding roller 402 is rotatably connected to the loading frame 401, and several rollers are evenly arranged thereon. The purpose is to place the cardboard stack on the upper side of the feeding roller 402 in advance, so as to facilitate the movement of the cardboard stack to the top of the support rod 2022.

[0040] The working principle and usage process of this invention are as follows: The cardboard stack is placed on the upper side of the feeding roller 402 beforehand. When the flipping mechanism 5 drives the pushing mechanism 2 to flip downwards and place the two supporting rods 2022 into the two clearance slots 6 respectively, the cardboard stack is moved above the supporting rods 2022. The first rotary transmission chain 203 drives the pushing frame 202 to move upwards, thereby lifting the cardboard stack through the supporting rods 2022. The second push rod 502 drives the first flipping frame 504 to flip upwards along the top of the second frame 501 at a certain angle. Then, the third push rod 503 drives the second... The flipping frame 505 flips upwards along the top of the first flipping frame 504, thereby driving the pushing mechanism 2 and the cardboard stack to flip upwards, raising the cardboard to a certain height and changing it from a horizontal to a vertical position. This aligns the pushing mechanism 2 with the feeding mechanism 1. By driving the first rotary transmission chain 203 to rotate, it drives the pushing frame 202 forward, causing it to push multiple cardboards forward a certain distance. When a certain number of cardboards fall from the support platform 201 onto the support plate 207, a height difference is formed between them and the cardboards behind them on the support platform 201. The bottom of the descending cardboard protrudes downwards from the bottom of the undescended cardboard. The fourth push rod 306 pushes the push block 302 and the pusher plate 301 to extend horizontally forward from below the support platform 201. The pusher plate 301 then pushes the bottom of the descending cardboard, pushing it onto the feeding mechanism 1. Due to friction between adjacent cardboards, some cardboard suspends in the air due to static friction in the vertical direction with the cardboards on the front and rear sides as it descends. When the pusher plate 301 pushes the front cardboard, this portion of cardboard loses friction and descends onto the support plate 207. The support plate 207 then... This section of cardboard is supported and kept upright. During the retraction of the push block 302 and pusher plate 301 driven by the fourth push rod 306, the rear side of the pusher plate 301 abuts against the front side of the foremost piece of cardboard in this section. As it continues to retract, the pusher plate 301 flips downward along the hinge point of the inclined block 305 and the U-shaped block 304, and then passes under the cardboard. After passing the cardboard, the pusher plate 301 flips upward and resets itself by the tension of the tension spring 303, preventing the cardboard from bending and improving production reliability.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A paperboard automatic feeding device comprising a feeding mechanism (1), characterized in that: The rear side of the feeding mechanism (1) is provided with a pushing mechanism (2), the pushing mechanism (2) comprises a supporting table (201), a pushing frame (202) arranged above the supporting table (201) and a first rotary transmission chain (203) symmetrically connected to the bottom of the pushing frame (202), the first rotary transmission chain (203) protrudes forward from the supporting table (201), and the two sides of the first rotary transmission chain (203) are symmetrically provided with vertical plates (204), the top of the vertical plate (204) is provided with a supporting strip (205), the bottom of the side of the supporting table (201) close to the feeding mechanism (1) is provided with a turnover mechanism (3), the turnover mechanism (3) comprises a pushing piece (301), a pushing block (302), a tension spring (303) and a fourth pushing rod (306), the pushing block (302) is movably connected to the rear side of the pushing piece (301), the fourth pushing rod (306) is connected to the end of the pushing block (302) away from the pushing piece (301), the bottom of the pushing piece (301) is connected with a U-shaped block (304), the lower side of the pushing block (302) is connected with an inclined block (305), the inclined block (305) is hinged to the U-shaped block (304), one end of the tension spring (303) is connected to one side of the pushing block (302), and the other end of the tension spring (303) is connected to one side of the pushing piece (301), the height of the pushing piece (301) and the height of the supporting table (201) are higher than the height of the supporting strip (205), the height of the pushing block (302) is lower than the height of the supporting strip (205), the lower side of the supporting table (201) is provided with a second rotary transmission chain (206), the second rotary transmission chain (206) protrudes forward from the supporting table (201), the outer side of the second rotary transmission chain (206) is uniformly arranged with a plurality of supporting plates (207), the height of the supporting plate (207) is higher than the height of the supporting strip (205), the height of the pushing piece (301) and the height of the supporting table (201) are higher than the height of the supporting plate (207).

2. The paperboard automatic feeding device according to claim 1, characterized in that: The feeding mechanism (1) comprises a first rack (101), a first motor (102), a first rotary drive shaft (103) and a first rotary feeding belt (104) in transmission connection with the first rotary drive shaft (103), the first rotary feeding belt (104) is uniformly arranged with a plurality of strips, the first rotary drive shaft (103) is installed on the first rack (101), and one end of the first rotary drive shaft (103) is connected with the output end of the first motor (102).

3. The paperboard automatic feeding device according to claim 2, characterized in that: The feeding mechanism (1) further comprises an inclined feeding assembly, the inclined feeding assembly comprises a second rotary feeding belt (105), a support (106) and a first push rod (107), the lower side of the support (106) is connected with a protruding block (108), the output end of the first push rod (107) is hinged with the protruding block (108), and the other end thereof is hinged with the first rack (101), one end of the second rotary feeding belt (105) is drivingly connected with a driving wheel (109) on the inner side, and the other end thereof is drivingly connected with a driven wheel (110) on the inner side, the driving wheel (109) is fixedly connected with the first rotary driving shaft (103), and the support (106) is rotatably connected with the driven wheel (110) at one end close to the supporting table (201) and rotatably connected with the first rotary driving shaft (103) at the other end through a bearing.

4. The paperboard automatic feeding device according to claim 1, wherein: The turnover mechanism (3) is provided with two groups and is symmetrically arranged on both sides of the second rotary transmission chain (206).

5. The paperboard automatic feeding device according to claim 1, wherein: The pushing mechanism (2) further comprises a second rotary driving shaft (208) and a second motor (209) drivingly connected with the second rotary driving shaft (208), and the second rotary transmission chain (206) and the first rotary transmission chain (203) are drivingly connected with the second rotary driving shaft (208).

6. The paperboard automatic feeding device according to claim 1, wherein: The supporting strip (205) is provided with a sliding groove (210) on one side close to the first rotary transmission chain (203), and the bottom of the pushing frame (202) is connected with a sliding block (211) slidingly connected with the sliding groove (210).

7. The paperboard automatic feeding device according to claim 1, characterized in that: Further comprising a feeding table (4), one side of the feeding mechanism (1) close to the feeding table (4) is provided with a turnover mechanism (5) for overturning the pushing mechanism (2), the pushing frame (202) comprises a main frame body (2021) and a material receiving rod (2022) symmetrically connected to the top of the main frame body (2021), and the feeding table (4) is provided with three, and an avoiding groove (6) corresponding to one material receiving rod (2022) is arranged between two adjacent feeding tables (4).

8. The paperboard automatic feeding device according to claim 7, characterized in that: The turnover mechanism (5) comprises a second rack (501), a second push rod (502), a third push rod (503), a first turnover frame (504) and a second turnover frame (505), the first turnover frame (504) is hinged with the top of the second rack (501), and one side close to the second rack (501) is hinged with the output end of the second push rod (502), the other end of the second push rod (502) is hinged with the bottom of the second rack (501), the second turnover frame (505) is hinged with the top of the first turnover frame (504), the output end of the third push rod (503) is hinged with one side of the second turnover frame (505) close to the first turnover frame (504), and the other end thereof is hinged with one side of the first turnover frame (504) away from the second push rod (502), and the pushing mechanism (2) is installed on the second turnover frame (505).

9. The paperboard automatic feeding device according to claim 7, characterized in that: The feeding table (4) comprises a feeding frame (401) and a feeding roller (402), the feeding roller (402) is rotatably connected with the feeding frame (401), and a plurality of feeding rollers (402) are uniformly arranged.

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