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

Abstract

The present 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 thereof, comprising a bracket, on which a paper bag conveying device is arranged, the paper bag conveying device comprises a conveying plate, on which two conveying synchronous belts and a conveying synchronous belt driving mechanism are arranged, and opposite surfaces of the two conveying synchronous belts are fitted to form a conveying channel; the conveying plate comprises 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 arranged 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; the device has the advantages of being able to mechanically and automatically complete the bag mouth wrapping, improving production efficiency, and reducing labor costs.

Description

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 thereof. Background Art

[0002] Paper bags are mainly used for packaging clothing and gift boxes. Due to the large market demand, they need to gradually change from manual production to mechanized and automated forming. Since the M-bottom paper bags with two-side center seals have a single-layer opening, the single-layer opening has poor firmness and is easy to scratch the body. The side of the bag opening is not beautiful, so we need to fold the bag opening inward and glue it.

[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 mouth closing machine, which has the advantages of being able to mechanically and automatically complete the bag mouth closing, improving production efficiency and reducing labor costs.

[0005] The object of the present invention is achieved in that:

[0006] A paper bag mouth-wrapping machine comprises a bracket, a paper bag conveying device is arranged on the bracket, 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 arranged in sequence along the conveying channel;

[0007] The bag mouth inner folding device comprises an inner folding bracket, on which are provided two auxiliary plates, two plugging plates and two pressing plates, and an auxiliary plate driving mechanism, a plugging plate driving mechanism and a pressing plate driving mechanism for driving the auxiliary plates, the plugging plates and the pressing plates to move 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 plug-in plate driving mechanism includes a plug-in plate up-and-down power arranged above the bag opening, and the driving end of the plug-in plate up-and-down power is connected to the plug-in plate; the plug-in plate includes two insertion parts, and the widths of both sides of the two insertion parts correspond to the width of the bag opening after it is opened;

[0010] The pressing plate driving mechanism includes a pressing plate front and rear power fixed on the inner folding bracket, a cylinder plate is fixed to the driving end of the pressing plate front and rear power, a pressing plate upper and lower cylinders are fixed on the cylinder plate, and a pressing plate is fixed to the driving end of the pressing plate upper and lower 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, and the auxiliary plate is fixedly connected to the synchronous belt 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 slidably arranged 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 to 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 a main bracket, and two swing arm plate cylinders are arranged to respectively drive the two conveying belt swing arm plates to swing, so as to facilitate clamping of the paper bag after the paper bag enters the conveying channel.

[0015] The present invention is further configured as follows: the bag mouth eversion device includes an eversion bracket, on which an eversion upper and lower driving cylinder is fixed, the output shaft of the eversion upper and lower 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 external folding plates are fixed on the two driving ends, the external folding plate includes an external folding surface and an internal pressure surface, the two internal pressure surfaces are arranged facing each other, and the two external folding surfaces are arranged back to back.

[0016] The present invention is further configured as follows: the outer folding plate includes a transverse connecting plate and a vertical working plate, the two vertical working plates are arranged at the near ends of the two transverse 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 back surfaces of the two vertical working plates.

[0017] The present invention is further configured as follows: air suction and bag opening devices are respectively provided on both sides of the conveying channel corresponding to the bag opening outward everting 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 with an eccentric plate, the other end of the eccentric plate is rotatably connected with 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 both connected with air suction nozzle frames, and the air suction nozzle frames are provided with a plurality of air suction nozzles connected to an air pump, the two groups of air suction nozzles are arranged facing each other, and the upper ends of the two air suction nozzle frames extend reference line pressing plates facing each other, and the upper end surfaces of the reference line pressing plates are auxiliary pressing surfaces.

[0018] The present invention is further configured as follows: 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 side 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 everting device, and bag opening devices are also provided corresponding to the internal gluing devices on both sides of the conveying channel; the internal gluing device comprises 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 respectively 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 laterally out of the output end and is connected to a glue scraping nozzle, and the glue scraping nozzle is installed with an upper and lower offset position.

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

[0021] A process flow for sealing a paper bag opening comprises the following steps:

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

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

[0024] 3) The paper bag is transported 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 glue spraying device on the front and back of the bag opening, and the glue spraying device on the front and back of the bag opening 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 inner folding device, and the bag opening device at the bag opening inner folding device opens the bag opening. Then the auxiliary plate of the bag opening inner folding device first turns the two sides of the bag opening outwards, and then the pressing plate turns the front and back of the bag opening inwards. Then the auxiliary plate also turns the two sides of the bag opening inwards 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 downwards, and finally the bag opening device is closed;

[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 inside the two 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, so that the bag opening is everted and then glue is sprayed, and then the front and back of the bag opening are folded inward, the two sides of the bag opening are folded inward, and then the bag opening is turned down and then the bag opening is flattened, thereby realizing an 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

[0032] Figure 2 Schematic diagram of the structure of a paper bag.

[0033] Figure 3 It is a structural schematic diagram of a paper bag conveying device.

[0034] Figure 4 for Figure 3 Enlarged view of point A.

[0035] Figure 5 It is a structural schematic diagram of the air suction bag opening device when it is closed.

[0036] Figure 6 It is a structural schematic diagram of the air suction bag opening device when it is opened.

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

[0038] Figure 8 It is a schematic diagram of the structure of the bag opening eversion device.

[0039] Fig. 9 It is a schematic diagram of the process of the bag mouth eversion device.

[0040] Fig.10 for Figure 1 Enlarged view of point B.

[0041] Fig.11 It is a structural schematic diagram of the bag mouth inward folding device.

[0042] Fig.12 This is a schematic diagram of the structure of the bag mouth folding device without the pressure plate.

[0043] Fig.13 It is a schematic diagram of the structure of the auxiliary board and the plug board.

[0044] Fig.14 It is a schematic diagram of the process of the bag mouth inner folding device.

[0045] 100-paper bag conveying device; 101-conveying plate; 102-conveying synchronous belt; 103-servo motor; 104-conveying channel; 105-conveying belt swing arm plate; 106-swing arm plate cylinder; 107-conveying belt positioning plate; 108-main board; 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 synchronous belt plate; 203-gluing synchronous belt; 204-gluing synchronous belt motor; 205-glue gun seat; 206-glue gun cylinder; 207-glue scraping nozzle;

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

[0048] 400-Glue spraying device on the front and back of the bag;

[0049] 500-bag mouth inner folding device; 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; 511-guide rail; 512-slider; 513-slider plate; 521-outward push surface; 522-upper hook surface; 523-inward push surface; 524-lower pressure surface; 531-insertion plate upper and lower cylinders; 532-insertion part; 533-inclined surface; 541-front and rear cylinders of the pressing plate; 542-cylinder plate; 543-pressing plate upper and lower cylinders;

[0050] 600-bag opening flattening device; 601-flattening plate; 602-flattening plate cylinder;

[0051] 700-air suction bag opening device; 701-bag opening bracket; 702-swing arm; 703-cross bar; 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 purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to 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 comprises a bracket, on which a paper bag conveying device 100 is arranged, the paper bag conveying device 100 comprises a conveying plate 101, on which two conveying synchronous belts 102 and a conveying synchronous belt servo motor 103 are arranged, and the opposite surfaces of the two conveying synchronous belts 102 are fitted together to form a conveying channel 104; the conveying plate 101 comprises 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 arranged 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 clamp the paper bag; a side baffle plate 109 and a side baffle plate cylinder 110 are arranged in front of the main board 108.

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

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

[0058] The air suction 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 suction nozzle frame 706, the swing arm 702, the steel sheet 705 and the suction nozzle frame 706 form a "[" shape, and the suction nozzle frame 706 is provided with a plurality of suction nozzles 707 connected to an air pump, and the two groups of 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 an eccentric plate 709, and the other end of the eccentric plate 709 is rotatably connected to a 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 combined, the two reference line pressing plates 711 form a reference line, which is aligned with the bag opening crease line 803, so as to facilitate the bag opening everting and inward folding of the paper bag 800 thereafter, and the upper end surfaces thereof can serve as the auxiliary pressing surfaces 712, so as to facilitate the glue spraying action during everting.

[0061] The internal gluing device 200 on both sides includes upper and lower gluing cylinders 201, and the output ends of the upper and lower gluing cylinders 201 are provided with a gluing synchronous belt plate 202, and the gluing synchronous belt plate 202 is provided with a gluing synchronous belt 203 and a gluing synchronous belt motor 204, and glue gun seats 205 are fixed on the two opposite sides of the gluing synchronous belt 203, and the lower end of the glue gun seat 205 is provided with a glue gun cylinder 206, and the glue gun cylinder 206 extends horizontally from the output end and is connected to a glue scraping nozzle 207, and the glue scraping nozzle 207 is installed with an upper and lower offset position.

[0062] The bag opening eversion device 300 includes an eversion bracket 301, on which an eversion up and down driving cylinder 302 is fixed. The output shaft of the eversion up and down driving cylinder 302 extends downward and is fixedly connected to an internal pressure shaping cylinder 303. The internal pressure shaping cylinder 303 extends driving ends to both sides, and external folding plates 304 are fixed to the two 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 surface 307 and the inner pressure surface 308 are both arranged on the vertical working plates 306. The two inner pressure surfaces 308 are arranged on the facing surfaces of the two vertical working plates 306. The two outer folding surfaces 307 are arranged on the back surfaces of the two vertical working plates 306. The driving end of the inner pressure shaping 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 mouth inner folding device 500 comprises an inner folding bracket, on which are provided two auxiliary plates 502, two plugging plates 503 and two pressing plates 504, as well as an auxiliary plate driving mechanism, a plugging plate driving mechanism and a pressing plate driving mechanism for driving the auxiliary plates, the plugging plates and the pressing plates to move 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, and 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 driving wheels, and the other end of the synchronous belt fixing plate 507 is connected to a driven wheel. A synchronous belt 508 is arranged 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 are moved away from or approached at the same time. In this way, the left and right movements of the two auxiliary plates and the plug plate are more simultaneous, more consistent, and more accurate.

[0067] A guide rail fixing plate is fixed to the lower end of the synchronous belt fixing plate 507, a guide rail 511 is fixed to the lower end of the guide rail fixing plate, a slider 512 is slidably provided on the guide rail 511, a slider plate 513 is fixed on the slider 512, 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 plug plate driving mechanism includes an upper and lower plug plate cylinder 531, which is fixed on the slider plate 513 and shares a set of left and right power with the auxiliary plate 502. The driving end of the upper and lower plug plate cylinder 531 extends downward and is connected to the plug plate 503. The plug 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 mouth after it is opened.

[0069] The outer width of the two insertion parts 532 of the plug board 503 is slightly smaller than the inner width of the bag opening after the suction device stretches the bag opening. The plug board 503 can be a plug board of various shapes. The most important thing is that the outer width of the two insertion parts needs to match the inner width of the bag opening after opening. The lower end of the insertion part 532 is formed with an inclined surface 533. The two insertion parts 532 are arranged at a 90° angle.

[0070] The pressure plate driving mechanism includes a pressure plate front and rear cylinders 541 fixed on the inner folding bracket, a cylinder plate 542 is fixed to the driving end of the pressure plate front and rear cylinders 541, 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 flattening plates 601 arranged on both sides of the channel, and flattening plate cylinders 602 driving the two flattening plates to move toward each other. The flattening plates 601 correspond to the position below the crease line 803 of the paper bag.

[0072] A process flow for sealing a paper bag opening comprises the following steps:

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

[0074] 2) Put the paper bag into the mouth-sealing machine, the conveying device 100 of the mouth-sealing machine conveys the paper bag to the gluing device 200 inside the two sides, the bag opening device 700 opens the bag mouth, and the gluing device 200 applies glue below the bag mouth crease line 803 inside the two 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 glue spraying device 400 on the front and back sides of the bag opening, and the glue spraying device 400 on the front and back sides of the bag opening sprays a long strip of glue on the front and back sides 802 of the bag opening after being turned inside out;

[0077] 5) The paper bag is conveyed to the bag opening inner folding device 500, and 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 surface 801 outward 90 degrees, and then the pressing plate 504 turns the front and back sides 802 of the bag opening inward 90 degrees. Then, the auxiliary plate also turns the bag opening side surface 801 inward 90 degrees to above the front and back sides 802 of the bag opening. Then, the inserting plate 503 turns the front and back sides 802 and the two side surfaces 801 of the bag opening downward, and finally, the bag opening device 700 is closed;

[0078] 6) The paper bag is conveyed to the bag opening flattening device 600 to flatten the bag opening and shape it.

[0079] Working principle of the present invention:

[0080] 1. Put the paper bag 800 with the triangular auxiliary inner fold line 806 and the bag opening crease line 803 and the two sides of the paper bag 800 sealed on the bottom plate 111 of the conveying device 100 of the bagging machine, and the side baffle 109 is against the side of the paper bag. At this time, the conveyor belt swing arm plate 105 is opened to facilitate the paper bag to be put in. After the paper bag is put in, the swing arm plate cylinder 106 drives the conveyor belt swing arm plate 105 to clamp the lower part of the paper bag, and the side baffle cylinder 110 controls the side baffle 109 to retreat, and the synchronous belt servo motor 103 controls the synchronous belt 102 to clamp the paper bag and transport 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 207 work at different times and complete in sequence; when the upper glue scraping nozzle 207 descends to the set position, the glue synchronous belt motor 204 drives the glue synchronous belt 203 to rotate, so that the upper two 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 for the lower glue scraping nozzle 207 to reach 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 is also closed and stops sucking the bag;

[0082] 3. The conveying device sends the paper bag to the bag opening outward turning device 300, and the suction nozzle of the bag opening device 700 sucks the bag opening and opens it. The outward turning up and down driving cylinder 302 moves the outer folding plate 304 downward into the bag opening, and 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, and then the two suction nozzle frames 706 are closed. The outer folding plate 304 moves the bag opening along the reference line pressing plate 711 of the suction nozzle frame through the outer folding surface 307 Fold outwards 90°, and then the suction nozzle frame 706 retreats; then the outer folding plate 304 is moved downwards by the outer folding up and down driving cylinder 302, so that the bag opening reaches an outer folding angle of about 170°, and then the inner pressure shaping cylinder 303 brings the two outer folding plates 304 closer to each other, and the inner pressure surfaces 308 of the two outer folding plates 304 squeeze and shape the everted bag opening, and then the outer folding plate 304 retreats. 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 glue spraying device 400 on the front and back sides of the bag opening, and the glue spraying device on the front and back sides of the bag opening sprays long strips of glue on the front and back sides 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°;

[0088] ④. The two auxiliary plates 502 continue to move away until they are out of the range of the side surface 801 of the bag opening, and then the two auxiliary plates 502 move downward and approach each other to the bottom of the side surface 801 of the bag opening, and then the two auxiliary plates 502 move upward to the position where the lower pressure surface is higher than the crease line 803, and the upper hook surfaces 522 of the two auxiliary plates 502 drive the side surface 801 of the bag opening to turn upward, and then the two auxiliary plates 502 approach each other, and the inner push surface 523 of the auxiliary plate 502 causes the side surface 801 of the bag opening to turn inward 90° to the top of the front and back sides 802 of the bag opening, and the lower pressure surface 524 of the auxiliary plate 502 presses on the top of the side surface 801 of the bag opening, and 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, the front and back surfaces 802 of the bag opening are partially pressed, and at this time, the two pressing plates 504 move away from each other and retreat; then the two inserting plates 503 are inserted downwards, so that the two 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 two side surfaces 801 and the front and back surfaces 802 of the bag opening are all folded in place, and a certain squeezing and shaping effect is achieved on the corners;

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

[0091] 6. The conveying device delivers 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 the inward folding, thereby completing the entire bag opening work.

[0092] The invention has the advantages of being able to mechanically and automatically complete the bag mouth sealing, 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 protection scope 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 protection scope of the present invention.

Claims

1. A paper bag mouth-wrapping machine, comprising a bracket, characterized in that: A paper bag conveying device is arranged on the bracket, and the paper bag conveying device comprises a conveying channel, and a bag opening outward turning device, a bag opening front and back side glue spraying device, and a bag opening inward folding device are arranged in sequence along the conveying channel; The bag mouth inner folding device comprises an inner folding bracket, on which are provided two auxiliary plates, two plugging plates and two pressing plates, and an auxiliary plate driving mechanism, a plugging plate driving mechanism and a pressing plate driving mechanism for driving the auxiliary plates, the plugging plates and the pressing plates to move 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 push surface, an upper hook surface, an inner push surface and a downward pressure surface; The plug-in plate driving mechanism includes a plug-in plate up-and-down power arranged above the bag opening, and the driving end of the plug-in plate up-and-down power is connected to the plug-in plate; the plug-in plate includes two insertion parts, and the widths of both sides of the two insertion parts correspond to the width of the bag opening after it is opened; The pressing plate driving mechanism includes a pressing plate front and rear power fixed on the inner folding bracket, a cylinder plate is fixed to the driving end of the pressing plate front and rear power, a pressing plate upper and lower cylinders are fixed to the cylinder plate, and a pressing plate is fixed to the driving end of the pressing plate upper and lower cylinders; The paper bag is conveyed to the bag opening everting device, which turns the front and back of the bag opening outward; the paper bag is conveyed 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 the eversion; the paper bag is conveyed to the bag opening inward folding device, and the bag opening device at the bag opening inward folding device opens the bag opening, and then the auxiliary plate of the bag opening inward folding device first turns the two sides of the bag opening outward, and then the pressing plate turns the front and back of the bag opening inward, and then the auxiliary plate turns the two sides of the bag opening inward to above the front and back of the bag opening, and then the insert plate turns the front and back and both sides of the bag opening downward.

2. A paper bag mouth-wrapping machine according to claim 1, characterized in that: The left and right power of the auxiliary plate includes left and right motors of the auxiliary plate and synchronous belts 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 synchronous belt connecting plate.

3. A paper bag mouth-wrapping machine according to claim 2, characterized in that: The driving end of the upper and lower power of the auxiliary plate is connected to a synchronous belt fixing plate, a guide rail fixing plate is fixed to the lower end of the synchronous belt fixing plate, a guide rail is fixed to the lower end of the guide rail fixing plate, 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 to 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 mouth-wrapping 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, 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 a main bracket, and two swing arm plate cylinders are arranged 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 conveying channel.

5. The paper bag mouth-wrapping machine according to claim 1, characterized in that: The bag opening eversion device includes an eversion bracket, on which an eversion up and down driving cylinder is fixed, the output shaft of the eversion up and down 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 external folding plates are fixed on both driving ends, the external folding plates include an external folding surface and an internal pressure surface, the two internal pressure surfaces are arranged facing each other, and the two external folding surfaces are arranged back to back.

6. A paper bag mouth-wrapping machine according to claim 5, characterized in that: The outer folding plate includes a transverse connecting plate and a vertical working plate. The two vertical working plates are arranged at the near ends of the two transverse 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. The two outer folding surfaces are arranged on the facing back surfaces of the two vertical working plates.

7. The paper bag mouth-wrapping 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 everting 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 with an eccentric plate, the other end of the eccentric plate is rotatably connected with 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 with air suction nozzle frames, and the air suction nozzle frames are provided with a plurality of air suction nozzles connected to an air pump, the two groups of air suction nozzles are arranged facing each other, and the upper ends of the two air suction nozzle frames extend baseline pressing plates facing each other, and the upper end surfaces of the baseline pressing plates are auxiliary pressing surfaces.

8. The paper bag mouth-wrapping 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 side glue spraying device, the bag opening inward folding device and the bag opening flattening device.

9. The paper bag mouth-wrapping machine according to claim 1, characterized in that: Internal gluing devices are also provided on both sides in front of the bag opening everting device, and bag opening devices are also provided on the conveying channel corresponding to the internal gluing devices on both sides; the internal 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 respectively 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 glue scraping nozzle, and the glue scraping nozzle is installed with an upper and lower offset position.

10. The paper bag mouth-wrapping machine according to claim 1, characterized in that: A bag mouth flattening device is also provided behind the bag mouth inner folding device. The bag mouth flattening device includes flat plates arranged on both sides of the conveying channel, and a flat plate cylinder driving 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 bag mouth wrapping process using the paper bag wrapping machine according to claim 1, 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 of the paper bag and complete the middle seal on both sides; 2) Put the paper bag into the bagging machine; 3) The paper bag is transported 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 glue spraying device on the front and back of the bag opening, and the glue spraying device on the front and back of the bag opening 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 inner folding device, and the bag opening device at the bag opening inner folding device opens the bag opening. Then the auxiliary plate of the bag opening inner folding device first turns the two sides of the bag opening outwards, and then the pressing plate turns the front and back of the bag opening inwards. Then the auxiliary plate also turns the two sides of the bag opening inwards 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 downwards, and finally the bag opening device is closed; 6) The paper bag is transported to the bag opening flattening device to flatten the bag opening and shape it.

12. The bag mouth sealing process according to claim 11, characterized in that: After the paper bag is put into 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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