Paper-bag opening processing machine, and bag-opening processing flow using same

Abstract

A paper-bag opening processing machine, and a bag-opening processing flow using same. The paper-bag opening processing machine comprises a support, wherein a paper-bag conveying device (100) is provided on the support, and the paper-bag conveying device (100) comprises a conveying plate assembly (101), two synchronous conveyor belts (102) and a driving mechanism for the synchronous conveyor belts (102) being provided on the conveying plate assembly (101), opposite surfaces of the two synchronous conveyor belts (102) being attached to form a conveying channel (104), and the conveying plate assembly (101) comprising a main plate (108) and conveyor-belt swing arm plates (105), which are rotationally arranged at the front end of the main plate (108). Two swing arm plate cylinders (106) are provided to respectively drive the two conveyor-belt swing arm plates (105) to swing, thereby facilitating clamping of a paper bag (800) after the paper bag (800) enters the conveying channel (104).

Description

A paper bag mouth wrapping machine and its bag mouth wrapping process Technical Field

[0001] The invention belongs to the field of paper bag forming equipment and relates to a paper bag mouth wrapping machine and a bag mouth wrapping process flow. Technical Background

[0002] Paper handbags are primarily used for packaging clothing and gift boxes. Due to high market demand, they are gradually transitioning from manual production to mechanized and automated forming. M-bottom paper bags with center seals on both sides have single-layer openings, which are less durable and easily scratched. The overlapped edge of the center seal on the sides of the bag opening is unsightly, so we need to fold the bag opening inward and glue it together.

[0003] The procedure of folding the bag mouth inward is complicated. In the traditional production process, the above procedures are still completed manually, which results in high labor costs and low production efficiency. Summary of the Invention

[0004] In view of the above problems, the present invention provides a paper bag closing machine, which has the advantages of being able to mechanically and automatically complete the bag closing, thereby improving production efficiency and reducing labor costs.

[0005] The object of the present invention is achieved like this:

[0006] A paper bag mouth-wrapping machine comprises a support, a paper bag conveying device is provided on the support, the paper bag conveying device comprises a conveying channel, and a bag mouth outward turning device, a bag mouth front and back glue spraying device, and a bag mouth inward folding device are sequentially provided along the conveying channel;

[0007] The bag opening inner folding device includes an inner folding bracket, on which are provided two auxiliary plates, two inserting plates and two pressing plates, as well as an auxiliary plate driving mechanism, an inserting plate driving mechanism and a pressing plate driving mechanism for driving the auxiliary plates, the inserting plates and the pressing plates respectively;

[0008] The auxiliary plate driving mechanism includes an auxiliary plate up and down power and an auxiliary plate left and right power; the auxiliary plate includes an outward pushing surface, an upper hook surface, an inner pushing surface and a downward pressing surface;

[0009] The plugboard driving mechanism includes a plugboard up and down power arranged above the bag opening, and the driving end of the plugboard up and down power is connected to the plugboard; the plugboard includes two insertion parts, and the width of both sides of the two insertion parts corresponds to the width of the bag opening after opening;

[0010] The pressure plate driving mechanism includes a pressure plate front and rear power fixed on the inward folding bracket, a cylinder plate fixed to the driving end of the pressure plate front and rear power, an upper and lower pressure plate cylinder fixed on the cylinder plate, and a pressure plate fixed to the driving end of the upper and lower pressure plate cylinders.

[0011] The present invention is further configured such that an inclined surface is formed on the outer side of the lower end of the insertion portion.

[0012] The present invention is further configured as follows: the left and right power of the auxiliary plate includes left and right motors of the auxiliary plate and a synchronous belt driven by the left and right motors of the auxiliary plate. The synchronous belt is horizontally transmitted. Two synchronous belt connecting plates are fixed on the synchronous belt. The two synchronous belt connecting plates are respectively arranged on the front and back sides of the synchronous belt. The auxiliary plate is fixedly connected to the connecting plate.

[0013] The present invention is further configured as follows: the driving end of the upper and lower power of the auxiliary plate is connected to a synchronous belt fixing plate, the lower end of the synchronous belt fixing plate is fixed with a guide rail fixing plate, the lower end of the guide rail fixing plate is fixed with a guide rail, a slider is slidingly provided on the guide rail, a slider plate is fixed on the slider, the slider plate is fixedly connected to the synchronous belt connecting plate, the auxiliary plate is fixed at the lower end of the slider plate, the upper and lower power of the plug plate is fixed on the slider plate, and the driving end of the upper and lower power of the plug plate extends downward and is connected to the plug plate.

[0014] The present invention is further configured as follows: the paper bag conveying device includes a conveying plate, on which are provided two conveying synchronous belts and a conveying synchronous belt driving mechanism, and the opposite surfaces of the two conveying synchronous belts are fitted together to form a conveying channel; the conveying plate includes a main board and a conveying belt swing arm plate rotatably arranged at the front end of the main bracket, and two swing arm plate cylinders are provided to respectively drive the two conveying belt swing arm plates to swing, so as to facilitate the clamping of the paper bag after the paper bag enters the channel.

[0015] The present invention is further configured as follows: the bag opening eversion device includes an eversion bracket, on which an up and down eversion driving cylinder is fixed, the output shaft of the up and down eversion driving cylinder extends downward and is fixedly connected to an internal pressure shaping cylinder, the internal pressure shaping cylinder extends the driving end to both sides, and an outer folding plate is fixed on the two driving ends, the outer folding plate includes an outer folding surface and an inner pressure surface, the two inner pressure surfaces are arranged facing each other, and the two outer folding surfaces are arranged back to back.

[0016] The present invention is further configured as follows: the outer folding plate includes a horizontal connecting plate and a vertical working plate, the two vertical working plates are arranged at the near ends of the two horizontal connecting plates, the outer folding surface and the inner pressure surface are both arranged on the vertical working plates, the two inner pressure surfaces are arranged on the facing surfaces of the two vertical working plates, and the two outer folding surfaces are arranged on the facing surfaces of the two vertical working plates.

[0017] The present invention is further configured as follows: an air suction and bag opening device is respectively provided on both sides of the conveying channel corresponding to the bag opening outward turning device and the bag opening inward folding device; the air suction and bag opening device includes a bag opening bracket and two groups of swing arms, two swing arm driving motors are fixed on the bag opening bracket respectively corresponding to the two groups of swing arms, one end of the swing arm is rotatably connected to the bag opening bracket, the output shaft of the swing arm driving motor is fixedly connected to an eccentric plate, the other end of the eccentric plate is rotatably connected to a connecting rod, and the other end of the connecting rod is rotatably connected to the middle of the swing arm; the upper ends of the two groups of swing arms are connected to a suction nozzle rack, and a plurality of suction nozzles connected to an air pump are provided on the suction nozzle rack, and the two groups of suction nozzles are arranged facing each other, and the upper ends of the two suction nozzle racks extend a reference line pressure plate towards each other, and the upper end surface of the pressure plate is an auxiliary pressure surface.

[0018] The present invention is further configured such that conveyor belt positioning plates are provided on both sides of the conveying channel corresponding to the bag opening everting device, the bag opening front and back glue spraying device, the bag opening inward folding device and the bag opening flattening device.

[0019] The present invention is further configured as follows: internal gluing devices are provided on both sides in front of the bag opening outward turning device, and a bag opening device is also provided corresponding to the gluing devices on both sides of the conveying channel; the gluing device includes upper and lower gluing cylinders, and the output ends of the upper and lower gluing cylinders are provided with gluing synchronous belt plates, and the gluing synchronous belt plates are provided with gluing synchronous belts and gluing synchronous belt motors, and glue gun seats are fixed on both opposite sides of the gluing synchronous belts, and a glue gun cylinder is provided at the lower end of the glue gun seat, and the glue gun cylinder extends horizontally out of the output end and is connected to a scraping glue nozzle, and the scraping glue nozzle is installed in an upper and lower staggered manner.

[0020] The present invention is further configured as follows: a bag opening flattening device is provided behind the bag opening inner folding device, and the bag opening flattening device includes flat pressing plates arranged on both sides of the channel, and flat pressing plate cylinders driving the two flat pressing plates to move toward each other, and the flat pressing plates correspond to the position below the crease line of the paper bag.

[0021] A paper bag mouth sealing process comprises the following steps:

[0022] 1) Make a triangular auxiliary inner fold line and an inner fold line on the bag opening and complete the middle seal on both sides;

[0023] 2) Place the paper bag into the bagging machine;

[0024] 3) The paper bag is conveyed to the bag opening eversion device, which turns the front and back of the bag opening outward;

[0025] 4) The paper bag is transported to the bag opening front and back glue spraying device, which sprays long strips of glue on the front and back of the bag opening after it is turned inside out;

[0026] 5) The paper bag is conveyed to the bag opening inward folding device. The bag opening device at the bag opening inward folding device opens the bag opening. Then the auxiliary plate of the bag opening inward folds the two sides of the bag opening outward. Then the pressing plate turns the front and back of the bag opening inward. Then the auxiliary plate turns the two sides of the opening inward to the top of the front and back of the bag opening. Then the inserting plate turns the front and back and both sides of the bag opening downward. Finally, the bag opening device closes.

[0027] 6) The paper bag is transported to the bag opening flattening device to flatten the bag opening and shape it.

[0028] The present invention is further configured as follows: after the paper bag is placed in the mouth-sealing machine, the conveying device of the mouth-sealing machine conveys the paper bag to the internal gluing devices on both sides, the bag opening device opens the bag mouth, and the gluing device applies glue below the bag mouth crease line on both sides of the paper bag.

[0029] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: a conveying device, on which a bag opening everting device, a bag opening front and back glue spraying device, a bag opening inward folding device and a bag opening flattening device are sequentially arranged, thereby realizing the bag opening everting and then glue spraying, and then folding the front and back of the bag opening inward, folding the two sides of the bag opening inward, then turning down and then flattening the bag opening, realizing the automated bagging process, improving production efficiency and reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 is a schematic structural diagram of a paper bag wrapping machine.

[0032] Figure 2 is a schematic structural diagram of a paper bag.

[0033] FIG3 is a schematic structural diagram of a paper bag conveying device.

[0034] FIG4 is an enlarged view of point A in FIG3 .

[0035] FIG5 is a schematic structural diagram of the air suction bag expansion device when it is closed.

[0036] FIG6 is a schematic structural diagram of the air suction bag opening device when it is opened.

[0037] Figure 7 is a schematic structural diagram of the internal gluing device on both sides.

[0038] FIG8 is a schematic structural diagram of the bag opening eversion device.

[0039] FIG9 is a schematic diagram of the process of the bag opening eversion device.

[0040] FIG10 is an enlarged view of point B in FIG1 .

[0041] FIG11 is a schematic structural diagram of the bag opening inner folding device.

[0042] FIG12 is a schematic structural diagram of the bag opening inner folding device without the pressing plate.

[0043] FIG13 is a schematic diagram of the structure of the auxiliary board and the plug-in board.

[0044] FIG14 is a schematic diagram of the process of the bag mouth inward folding device.

[0045] 100 - Paper bag conveyor; 101 - Conveyor plate; 102 - Conveyor timing belt; 103 - Servo motor; 104 - Conveyor channel; 105 - Conveyor belt swing arm plate; 106 - Swing arm plate cylinder; 107 - Conveyor belt positioning plate; 108 - Main plate; 109 - Side baffle; 110 - Side baffle cylinder; 111 - Bottom plate;

[0046] 200- Internal gluing device on both sides; 201- Upper and lower gluing cylinders; 202- Gluing timing belt plate; 203- Gluing timing belt; 204- Gluing timing belt motor; 205- Glue gun holder; 206- Glue gun cylinder; 207- Glue scraping nozzle;

[0047] 300-bag opening eversion device; 301-eversion bracket; 302-eversion upper and lower driving cylinder; 303-internal pressure shaping cylinder; 304-outer folding plate; 305-transverse connecting plate; 306-vertical working plate; 307-outer folding surface; 308-internal pressure surface;

[0048] 400- Bag front and back glue spraying device;

[0049] 500-bag opening inner folding device; 501-inner folding bracket; 502-auxiliary plate; 503-insertion plate; 504-pressing plate; 505-auxiliary plate upper and lower cylinders; 506-auxiliary plate left and right motors; 507-synchronous belt fixing plate; 508-synchronous belt; 509-synchronous belt connecting plate; 510-guide rail fixing plate; 511-guide rail; 512-slider; 513-slider plate; 521-external push surface; 522-upper hook surface; 523-inner push surface; 524-lower pressing surface; 531-insertion plate upper and lower cylinders; 532-insertion part; 533-inclined surface; 541-pressing plate front and rear cylinders; 542-cylinder plate; 543-pressing plate upper and lower cylinders;

[0050] 600-Bag flattening device; 601-Pressing plate; 602-Pressing plate cylinder;

[0051] 700 - air suction and bag opening device; 701 - bag opening bracket; 702 - swing arm; 703 - crossbar; 704 - vertical bar; 705 - elastic steel sheet; 706 - suction nozzle bracket; 707 - suction nozzle; 708 - swing arm drive motor; 709 - eccentric plate; 710 - connecting rod; 711 - reference line pressure plate; 712 - auxiliary pressure surface;

[0052] 800-paper bag; 801-side of bag opening; 802-front and back of bag opening; 803-crease line; 804-front and back of paper bag; 805-spray glue; 806-triangular auxiliary inner fold line. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0054] The left-right direction described in the present invention corresponds to the side of the paper bag, and the front-back direction corresponds to the front and back of the paper bag.

[0055] A paper bag wrapping machine includes a bracket, on which a paper bag conveying device 100 is provided. The paper bag conveying device 100 includes a conveying plate 101, on which two conveying synchronous belts 102 and a conveying synchronous belt servo motor 103 are provided. The opposite surfaces of the two conveying synchronous belts 102 are fitted together to form a conveying channel 104; the conveying plate 101 includes a main board 108 and a conveying belt swing arm plate 105 rotatably arranged at the front end of the main bracket, and two swing arm plate cylinders 106 are provided to respectively drive the two conveying belt swing arm plates 105 to swing, so as to facilitate the paper bag 800 to enter the channel and be clamped; a side baffle 109 and a side baffle cylinder 110 are provided in front of the main board 108.

[0056] The conveying device 100 is provided with internal gluing devices 200 on both sides, a bag opening outward turning device 300, a bag opening front and back glue spraying device 400, a bag opening inward folding device 500, and a bag opening flattening device 600 in sequence along the conveying channel 104; conveyor belt positioning plates 107 are provided on both sides of the conveying channel 104 corresponding to the internal gluing devices 200, the bag opening outward turning device 300, the bag opening front and back glue spraying device 400, the bag opening inward folding device 500, and the bag opening flattening device 600;

[0057] Air suction and bag opening devices 700 are respectively provided on both sides of the conveying channel 104 corresponding to the internal gluing device 200 , the bag opening outward turning device 300 , and the bag opening inward folding device 500 .

[0058] The air suction and bag opening device 700 includes a bag opening bracket 701 and two groups of swing arms 702. The swing arm 702 includes a horizontal bar 703 and a vertical bar 704. The horizontal bar 703 and the vertical bar 704 form an "L" shape. The outer end of the horizontal bar 703 is rotatably connected to the bag opening bracket 701. The upper ends of the two vertical bars 704 are fixedly connected to the elastic steel sheet 705. The other end of the elastic steel sheet 705 is fixedly connected to the air suction nozzle frame 706. The swing arm 702, the steel sheet 705 and the air suction nozzle frame 706 form a "[" shape. The air suction nozzle frame 706 is provided with a number of air suction nozzles 707 connected to the air pump, and the two groups of air suction nozzles 707 are arranged facing each other.

[0059] Two swing arm drive motors 708 are fixed on the bag opening bracket 701, corresponding to the two groups of swing arms 702 respectively. The output shaft of the swing arm drive motor 708 is fixedly connected to the eccentric plate 709, and the other end of the eccentric plate 709 is rotatably connected to the connecting rod 710, and the other end of the connecting rod 710 is rotatably connected to the middle part of the swing arm 702.

[0060] The upper ends of the two suction nozzle frames 706 extend toward each other to form reference line pressing plates 711, and the upper end surfaces of the reference line pressing plates 711 are auxiliary pressing surfaces 712. Through the setting of the reference line pressing plates 711, when the swing arms 702 are merged, the two reference line pressing plates 711 form a reference line, which is aligned with the bag opening crease line 803, facilitating the outward and inward folding of the bag opening 800 at the back, and its upper end surface can serve as the auxiliary pressing surface 712, facilitating the glue spraying action during outward folding.

[0061] The internal gluing device 200 on both sides includes upper and lower gluing cylinders 201. The output ends of the upper and lower gluing cylinders 201 are provided with gluing synchronous belt plates 202. The gluing synchronous belt plates 202 are provided with gluing synchronous belts 203 and gluing synchronous belt motors 204. Glue gun seats 205 are fixed on both opposite sides of the gluing synchronous belt 203. The lower end of the glue gun seat 205 is provided with a glue gun cylinder 206. The glue gun cylinder 206 extends horizontally out of the output end and is connected to a glue scraping nozzle 207. The glue scraping nozzle 207 is installed in an upper and lower staggered manner.

[0062] The bag opening eversion device 300 includes an eversion bracket 301, on which an eversion upper and lower driving cylinder 302 is fixed. The output shaft of the eversion upper and lower driving cylinder 302 extends downward and is fixedly connected to an internal pressure shaping cylinder 303. The internal pressure shaping cylinder 303 extends its driving ends to both sides, and an external folding plate 304 is fixed on both driving ends.

[0063] The outer folding plate 304 includes a transverse connecting plate 305 and a vertical working plate 306. The two vertical working plates 306 are arranged at the proximal ends of the two transverse connecting plates 305. The outer folding surfaces 307 and the internal pressure surfaces 308 are both arranged on the vertical working plates 306. The two internal pressure surfaces 308 are arranged on the facing surfaces of the two vertical working plates 306, and the two outer folding surfaces 307 are arranged on the back surfaces of the two vertical working plates 306. The driving end of the internal pressure setting cylinder 303 is fixedly connected to the transverse connecting plate 305. The transverse connecting plate 305 and the vertical working plate 306 form an "L" shape, and the two outer folding plates 304 form a "T" shape when combined.

[0064] The bag opening inner folding device 500 includes an inner folding bracket 501, on which are provided two auxiliary plates 502, two inserting plates 503, and two pressing plates 504, as well as an auxiliary plate driving mechanism, an inserting plate driving mechanism, and a pressing plate driving mechanism for driving the auxiliary plates, the inserting plates, and the pressing plates, respectively;

[0065] The auxiliary plate driving mechanism includes an auxiliary plate upper and lower cylinder 505 and an auxiliary plate left and right motor 506. The auxiliary plate upper and lower cylinder 505 is fixed on the inner folding bracket 501. The driving end of the auxiliary plate upper and lower cylinder 505 is connected to a synchronous belt fixing plate 507.

[0066] The left and right motors 506 of the auxiliary plate are fixed to the left and right ends of the synchronous belt fixing plate 507. The output ends of the left and right motors 506 of the auxiliary plate are connected to the driving wheel, and the other end of the synchronous belt fixing plate 507 is connected to the driven wheel. A synchronous belt 508 is provided between the driving wheel and the driven wheel. The synchronous belt 508 is horizontally transmitted. Two synchronous belt connecting plates 509 are fixed on the synchronous belt 508. The two synchronous belt connecting plates 509 are respectively arranged on the front and back sides of the synchronous belt 508, so that when the synchronous belt 508 is running, the two synchronous belt connecting plates 509 move toward each other or in the opposite direction, so that the auxiliary plates move away from or approach each other at the same time. In this way, the left and right movements of the two auxiliary plates and the plug-in plate are more simultaneous, with higher consistency and higher accuracy.

[0067] The lower end of the synchronous belt fixing plate 507 is fixed with a guide rail fixing plate 510, and the lower end of the guide rail fixing plate 510 is fixed with a guide rail 511, a slider 512 is slidingly provided on the guide rail 511, and a slider plate 513 is fixed on the slider 512, and the slider plate 513 is fixedly connected to the synchronous belt connecting plate 509. The auxiliary plate 502 is fixed to the lower end of the slider plate 513, and the auxiliary plate is "L"-shaped and includes an outward push surface 521, an upper hook surface 522, an inner push surface 523 and a downward pressure surface 524.

[0068] The insert plate driving mechanism includes an insert plate upper and lower cylinders 531, which are fixed on the slider plate 513 and share a set of left and right power with the auxiliary plate 502. The driving end of the insert plate upper and lower cylinders 531 extends downward and is connected to the insert plate 503. The insert plate 503 includes two insertion parts 532, and the width of both sides of the two insertion parts 532 corresponds to the width of the bag after the bag opening is opened.

[0069] The outer width of the two inserting portions 532 of the inserting plate 503 is slightly smaller than the inner width of the bag opening after the suction device has opened the bag opening. The inserting plate 503 can be of various shapes; the key is that the outer width of the two inserting portions must match the inner width of the bag opening after opening. The lower outer ends of the inserting portions 532 are formed with an inclined surface 533. The two inserting portions 533 are arranged at a 90° angle.

[0070] The pressure plate driving mechanism includes a pressure plate front and rear cylinders 541 fixed on the inward folding bracket, a cylinder plate 542 is fixed to the driving end of the pressure plate front and rear cylinders 541, and a pressure plate upper and lower cylinders 543 are fixed on the cylinder plate 542, and a pressure plate 504 is fixed to the driving end of the pressure plate upper and lower cylinders.

[0071] The bag opening flattening device 600 includes flat plates 601 arranged on both sides of the channel and flat plate cylinders 602 that drive the two flat plates to move toward each other. The flat plates 601 correspond to the position below the crease line 803 of the paper bag.

[0072] A paper bag mouth sealing process comprises the following steps:

[0073] 1) Mark the opening of the paper bag 800 with a triangular auxiliary inner fold line and an inner fold line on the bag opening and complete the center seal on both sides;

[0074] 2) The paper bag is placed in the bagging machine. The conveying device 100 of the bagging machine conveys the paper bag to the gluing device 200 on both sides. The bag opening device 700 opens the bag mouth. The gluing device 200 applies glue below the bag mouth crease line 803 on both sides of the paper bag.

[0075] 3) The paper bag is conveyed to the bag opening eversion device 300, which everts the front and back sides 802 of the bag opening 90°;

[0076] 4) The paper bag is conveyed to the bag opening front and back glue spraying device 400, which sprays a long strip of glue on the front and back of the bag opening 802 after it is turned inside out;

[0077] 5) The paper bag is conveyed to the bag opening inner folding device 500. The bag opening device 700 at the bag opening inner folding device 500 opens the bag opening. Then, the auxiliary plate 502 of the bag opening inner folding device 500 first turns the bag opening side 801 outward 90 degrees. Then, the pressing plate 804 turns the front and back sides 802 of the bag opening inward 90 degrees. Then, the auxiliary plate turns the bag opening side 801 inward 90 degrees to above the front and back sides 802 of the bag opening. Then, the inserting plate 803 turns the front and back sides 802 and both sides 801 of the bag opening downward. Finally, the bag opening device 700 is closed.

[0078] 6) The paper bag is conveyed to the bag opening flattening device 600, where the bag opening is flattened and shaped.

[0079] Working principle of the present invention:

[0080] 1. The paper bag 800 with the triangular auxiliary inner fold line 806 and the bag opening crease line 803 and the two sides sealed is placed on the bottom plate 111 of the conveying device 100 of the bagging machine. The side baffles 109 are against the sides of the paper bag. At this time, the conveyor belt swing arm plate 105 is opened to facilitate the placement of the paper bag. After the paper bag is placed, the swing arm plate cylinder 106 drives the conveyor belt swing arm plate 105 to clamp the lower part of the paper bag. The side baffle cylinder 106 controls the side baffle 105 to retreat, and the synchronous belt servo motor 103 controls the synchronous belt 102 to sandwich the paper bag and convey it forward;

[0081] 2. The paper bag is conveyed to the internal gluing device 200 on both sides, the bag opening device 700 sucks the front and back sides 804 of the paper bag and opens the bag mouth, and the upper and lower gluing cylinders 201 drive the glue scraping nozzle 207 to move downward. Since the two glue scraping nozzles 207 are staggered up and down, the two glue scraping nozzles have different working times and complete in sequence; when the upper glue scraping nozzle 207 drops to the set position, the glue synchronous belt motor 204 drives the glue synchronous belt 203 to rotate, so that the two upper glue scraping nozzles 207 move to the sides of the paper bag (below the crease line) on both sides, and the upper glue scraping nozzle 207 moves sideways under the drive of the glue gun cylinder and sprays glue, and then moves upward and waits until the lower glue scraping nozzle 207 reaches the set position before spraying glue; after both sides are sprayed, the glue synchronous belt motor 204 and the upper and lower glue cylinders 201 are reset, and the bag opening device 700 also closes and stops sucking the bag;

[0082] 3. The conveying device sends the paper bag to the bag opening outside turning device 300. The suction nozzle of the bag opening device 700 sucks the bag opening and opens it. The outside turning up and down driving cylinder 302 moves the outer folding plate 304 downward into the bag opening. The lower end surface of the outer folding plate 304 is aligned with the bag opening crease line 803 (slightly higher than the upper end surface of the reference line pressing plate). At this time, the two outer folding plates 304 are separated. Then the two suction nozzle frames 706 are closed. The outer folding plate 304 uses the outer folding surface 307 to move the bag opening along the reference line pressing plate 711 of the suction nozzle frame. Fold outward 90°, and then the suction nozzle frame 706 retracts; then the outward-flipping up and down driving cylinder 302 moves the outer folding plate 304 downward again, so that the outward-flipping angle of the bag opening reaches about 170°, and then the internal pressure shaping cylinder 303 moves the two outer folding plates 304 close to each other, and the internal pressure surfaces 308 of the two outer folding plates 304 squeeze and shape the outward-flipped bag opening, and then the outer folding plate 304 retracts. Due to the effect of squeezing and shaping, the bag opening can only rebound to a range close to 90°, which is convenient for the subsequent glue spraying work on the folded bag opening;

[0083] 4. The conveying device sends the paper bag to the bag opening front and back glue spraying device 400, and the bag opening front and back glue spraying device sprays long strips of glue on the front and back of the bag opening after it is turned inside out;

[0084] 5. The conveying device sends the paper bag to the bag opening inner folding device 500.

[0085] ① The suction device 700 sucks the front and back sides 804 of the paper bag to open the bag mouth;

[0086] ② The two auxiliary plates 502 move down into the bag opening, and then the two auxiliary plates 502 move away from each other to the sides, and the outward pushing surfaces 521 of the auxiliary plates turn the side surfaces 801 of the bag opening outward;

[0087] ③. The two pressing plates 504 move closer to each other to fold the front and back sides 804 of the bag opening inwards, and then move downwards to the position of the bag opening crease line 803 to fold the front and back sides 804 of the bag opening inwards by 90 degrees.

[0088] ④. The two auxiliary plates 502 continue to move away from each other until they are out of the range of the bag opening side surface 801, and then the two auxiliary plates 502 move downward and move closer to each other to the bottom of the bag opening side surface 801, and then the two auxiliary plates 502 move upward until the lower pressing surface is higher than the crease line 803, and the upper hook surfaces 522 of the two auxiliary plates 502 drive the bag opening side surface 801 to turn upward, and then the two auxiliary plates 502 move closer to each other, and the inner pushing surface 523 of the auxiliary plate 502 causes the bag opening side surface 801 to be folded inward 90 degrees to above the front and back sides 802 of the bag opening, and the lower pressing surface 524 of the auxiliary plate 502 is pressed above the bag opening side surface 801, at this time the front and back sides 802 and the two side surfaces 801 of the bag opening are all in an inverted state;

[0089] ⑤. After the side surface 801 of the bag opening is folded inwards to the top of the front and back surfaces 802 of the bag opening, it partially presses the front and back surfaces 802 of the bag opening. At this time, the two pressing plates 504 move away from each other and retract. Then, the two inserting plates 503 are inserted downwards, so that the side surfaces 801 and the front and back surfaces 802 of the bag opening are all folded downwards. Then, the two inserting plates 503 move away from each other to the side edges of the bag opening, so that the side surfaces 801 and the front and back surfaces 802 of the bag opening are all folded into place, and a certain squeezing and shaping effect is achieved at the corners.

[0090] ⑥. The insert plate 503 and the auxiliary plate 502 are returned to their original positions, and the suction device 700 is closed and stops suctioning;

[0091] 6. The conveying device sends the paper bag to the bag opening flattening device 600. The flattening plate cylinder 602 controls the flattening plates 601 to move closer to each other and flatten the bag opening after folding inward, thereby completing the entire bag opening work.

[0092] The invention has the advantages of being able to mechanically and automatically complete bag opening sealing, thereby improving production efficiency and reducing labor costs.

[0093] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A paper bag sealing machine, comprising a bracket, characterized in that: A paper bag conveying device is provided on the bracket, and the paper bag conveying device includes a conveying channel, and a bag opening outward turning device, a bag opening front and back glue spraying device, and a bag opening inward folding device are sequentially provided along the conveying channel; The bag opening inner folding device includes an inner folding bracket, on which are provided two auxiliary plates, two inserting plates and two pressing plates, as well as an auxiliary plate driving mechanism, an inserting plate driving mechanism and a pressing plate driving mechanism for driving the auxiliary plates, the inserting plates and the pressing plates respectively; The auxiliary plate driving mechanism includes an auxiliary plate up and down power and an auxiliary plate left and right power; the auxiliary plate includes an outward pushing surface, an upper hook surface, an inner pushing surface and a downward pressing surface; The plugboard driving mechanism includes a plugboard up and down power arranged above the bag opening, and the driving end of the plugboard up and down power is connected to the plugboard; the plugboard includes two insertion parts, and the width of both sides of the two insertion parts corresponds to the width of the bag opening after opening; The pressure plate driving mechanism includes a pressure plate front and rear power fixed on the inward folding bracket, a cylinder plate fixed to the driving end of the pressure plate front and rear power, an upper and lower pressure plate cylinder fixed on the cylinder plate, and a pressure plate fixed to the driving end of the upper and lower pressure plate cylinders.

2. The paper bag closing machine according to claim 1, characterized in that: The left and right power of the auxiliary plate includes the left and right motors of the auxiliary plate and the synchronous belt driven by the left and right motors of the auxiliary plate. The synchronous belt is horizontally transmitted. Two synchronous belt connecting plates are fixed on the synchronous belt. The two synchronous belt connecting plates are respectively arranged on the front and back sides of the synchronous belt. The auxiliary plate is fixedly connected to the connecting plate.

3. The paper bag closing machine according to claim 2, characterized in that: The driving end of the upper and lower power of the auxiliary plate is connected to the synchronous belt fixing plate, the lower end of the synchronous belt fixing plate is fixed with a guide rail fixing plate, the lower end of the guide rail fixing plate is fixed with a guide rail, a slider is slidably provided on the guide rail, a slider plate is fixed on the slider, the slider plate is fixedly connected to the synchronous belt connecting plate, the auxiliary plate is fixed at the lower end of the slider plate, the upper and lower power of the plug plate is fixed on the slider plate, and the driving end of the upper and lower power of the plug plate extends downward and is connected to the plug plate.

4. The paper bag closing machine according to claim 1, characterized in that: The paper bag conveying device includes a conveying plate, on which are provided two conveying synchronous belts and a conveying synchronous belt driving mechanism. The opposite surfaces of the two conveying synchronous belts are fitted together to form a conveying channel; the conveying plate includes a main board and a conveying belt swing arm plate rotatably arranged at the front end of the main bracket. Two swing arm plate cylinders are provided to respectively drive the two conveying belt swing arm plates to swing, so as to facilitate the clamping of the paper bag after the paper bag enters the channel.

5. The paper bag closing machine according to claim 1, characterized in that: The bag opening eversion device includes an eversion bracket, on which an up and down eversion driving cylinder is fixed, the output shaft of the up and down eversion driving cylinder extends downward and is fixedly connected to an internal pressure shaping cylinder, the internal pressure shaping cylinder extends driving ends to both sides, and an outer folding plate is fixed on both driving ends, the outer folding plate includes an outer folding surface and an inner pressure surface, the two inner pressure surfaces are arranged facing each other, and the two outer folding surfaces are arranged back to back.

6. The paper bag closing machine according to claim 5, characterized in that: The outer folding plate includes a horizontal connecting plate and a vertical working plate. The two vertical working plates are arranged at the near ends of the two horizontal connecting plates. The outer folding surface and the inner pressure surface are both arranged on the vertical working plates. The two inner pressure surfaces are arranged on the facing surfaces of the two vertical working plates, and the two outer folding surfaces are arranged on the facing surfaces of the two vertical working plates.

7. The paper bag closing machine according to claim 1, characterized in that: Air suction and bag opening devices are respectively provided on both sides of the conveying channel corresponding to the bag opening outward turning device and the bag opening inward folding device; the air suction and bag opening device comprises a bag opening bracket and two groups of swing arms, two swing arm driving motors are fixed on the bag opening bracket corresponding to the two groups of swing arms respectively, one end of the swing arm is rotatably connected to the bag opening bracket, the output shaft of the swing arm driving motor is fixedly connected to an eccentric plate, the other end of the eccentric plate is rotatably connected to a connecting rod, and the other end of the connecting rod is rotatably connected to the middle part of the swing arm; the upper ends of the two groups of swing arms are connected to suction nozzle racks, and the suction nozzle racks are provided with a number of suction nozzles connected to the air pump, and the two groups of suction nozzles are arranged facing each other, and the upper ends of the two suction nozzle racks extend a reference line pressure plate towards each other, and the upper end surface of the pressure plate is an auxiliary pressure surface.

8. The paper bag closing machine according to claim 1, characterized in that: Conveyor belt positioning plates are provided on both sides of the conveying channel corresponding to the bag opening everting device, the bag opening front and back glue spraying device, the bag opening inward folding device and the bag opening flattening device.

9. The paper bag closing machine according to claim 1, characterized in that: The bag opening outward turning device is also provided with internal gluing devices on both sides in front of the bag opening outward turning device, and the conveying channel is also provided with a bag opening device corresponding to the gluing devices on the back of the two sides; the gluing device includes upper and lower gluing cylinders, and the output ends of the upper and lower gluing cylinders are provided with gluing synchronous belt plates, and the gluing synchronous belt plates are provided with gluing synchronous belts and gluing synchronous belt motors, and glue gun seats are fixed on both opposite sides of the gluing synchronous belts, and a glue gun cylinder is provided at the lower end of the glue gun seat, and the glue gun cylinder extends horizontally out of the output end and is connected to a scraping glue nozzle, and the scraping glue nozzle is installed in an upper and lower staggered manner.

10. The paper bag closing machine according to claim 1, characterized in that: A bag opening flattening device is also provided behind the bag opening inward folding device. The bag opening flattening device includes flat plates arranged on both sides of the channel and flat plate cylinders that drive the two flat plates to move toward each other. The flat plates correspond to the position below the crease line of the paper bag.

11. A paper bag mouth sealing process, characterized in that: The following steps are involved: 1) Make a triangular auxiliary inner fold line and an inner fold line on the bag opening and complete the middle seal on both sides; 2) Place the paper bag into the bagging machine; 3) The paper bag is conveyed to the bag opening eversion device, which turns the front and back of the bag opening outward; 4) The paper bag is transported to the bag opening front and back glue spraying device, which sprays long strips of glue on the front and back of the bag opening after it is turned inside out; 5) The paper bag is conveyed to the bag opening inward folding device. The bag opening device at the bag opening inward folding device opens the bag opening. Then the auxiliary plate of the bag opening inward folds the two sides of the bag opening outward. Then the pressing plate turns the front and back of the bag opening inward. Then the auxiliary plate turns the two sides of the bag opening inward to the top of the front and back of the bag opening. Then the inserting plate turns the front and back and both sides of the bag opening downward. Finally, the bag opening device closes. 6) The paper bag is transported to the bag opening flattening device to flatten the bag opening and shape it.

12. The process flow for sealing the paper bag opening according to claim 11, characterized in that: After the paper bag is placed in the mouth-sealing machine, the conveying device of the mouth-sealing machine sends the paper bag to the internal gluing device on both sides. The bag opening device opens the bag mouth, and the gluing device applies glue below the bag mouth crease line on both sides of the paper bag.

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