A stitching device for the inner and outer bags of a woven bag

Abstract

The present invention discloses a sewing device for inner and outer bags of woven bags, which relates to a processing device for woven bags. It includes a frame equipped with a conveying mechanism, an opening mechanism, an ultrasonic sewing mechanism, and a leveling and blanking mechanism, and also includes a rotating and bag-turning mechanism and a woven bag mouth-opening mechanism used in cooperation with the opening mechanism; the rotating and bag-turning mechanism consists of a bag mouth rotating component and a bag tail rotating component; the bag mouth rotating component is movably installed on the frame on one side of the opening mechanism through a driving mechanism, and the woven bag mouth-opening mechanism is installed on the driving mechanism so that the woven bag mouth-opening mechanism can be inserted into the opening mechanism. The present invention effectively prevents the phenomenon that the two sides of the inner and outer bags are easily separated and fall off after separation, improves the reliability of production, and the sewing joint of the inner and outer bags after sewing is flat and beautiful.

Description

Technical Field

[0001] The present invention relates to a woven bag processing device, and more specifically, to a sewing device for the inner and outer bags of a woven bag. Background Art

[0002] In the traditional sewing process of the inner and outer bags of a woven bag, manual sewing is mostly used. This method not only wastes labor costs, but also has low work efficiency and often cannot meet production needs.

[0003] To solve this problem, some equipment manufacturers have provided corresponding woven bag production devices. For example, the woven bag production line disclosed in the publication number CN208881195U includes an inner bag conveyor line, an outer bag conveyor line, and a woven bag conveyor line. Along the transmission direction of the inner bag on the inner bag conveyor line, there are successively arranged an inner bag uncoiling mechanism for supporting the inner bag roll and unwinding the inner bag roll, an inner bag fixed-length cutting mechanism, a flipping mechanism for fixing and flipping the end of the inner bag close to the outer bag, and an inner bag pushing mechanism for pushing the inner bag into the outer bag; along the transmission direction of the outer bag on the outer bag conveyor line, there are successively arranged an outer bag uncoiling mechanism, an outer bag fixed-length cutting mechanism, and an outer bag opening mechanism; along the transmission direction of the woven bag on the woven bag conveyor line, there are successively arranged a bottom sewing mechanism for spot-welding the inner and outer bags around the mouth of the woven bag, an ultrasonic welding mechanism, and a leveling mechanism for leveling and transporting the woven bag. This production line can automatically complete the production of woven bags, improve the degree of automation, and has high efficiency and stable operation.

[0004] However, in actual applications, there are still some problems with this production line. For example, in the inner and outer bag sewing mechanism part of this production line, after the woven bag opening device at the mouth of the woven bag adsorbs and separates the upper and lower layers of the inner and outer bags, there is often an unstable adsorption phenomenon, resulting in the dropped of the adsorbed part, affecting normal production. After multiple detections, it is found that the main reason for this phenomenon is that due to the uneven surface of the outer bag and the gaps between the woven strips, air leakage easily occurs during the adsorption process of the opening mechanism. Moreover, this phenomenon is continuous, which in turn causes the opening mechanism to adsorb the inner bag unstably, making it easy to drop. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sewing device for the inner and outer bags of a woven bag in view of the deficiencies of the prior art, which solves the problem that due to the uneven surface of the outer bag and the gaps between the woven strips, air leakage easily occurs continuously during the adsorption process of the opening mechanism, resulting in unstable adsorption of the inner bag and its dropping.

[0006] A stitching device for the inner and outer bags of a woven bag according to the present invention includes a frame body equipped with a conveying mechanism, an opening mechanism, an ultrasonic stitching mechanism, and a leveling and blanking mechanism, and further includes a rotating and turning bag mechanism and a woven bag mouth expanding mechanism used in cooperation with the opening mechanism; the rotating and turning bag mechanism is composed of a bag mouth rotating assembly and a bag tail rotating assembly; the bag mouth rotating assembly is movably installed on the frame body on one side of the opening mechanism through a driving mechanism, and the woven bag mouth expanding mechanism is installed on the driving mechanism so that the woven bag mouth expanding mechanism can be inserted into the opening mechanism.

[0007] The woven bag mouth expanding mechanism includes a connecting rod, an upper air pipe, and a lower air pipe; the connecting rod is fixedly installed on the driving mechanism, and the connecting rod extends to the side of the bag mouth rotating assembly close to the opening mechanism; the upper air pipe and the lower air pipe are both fixedly installed at the end of the connecting rod, a plurality of upper air outlet holes are provided on the side of the upper air pipe away from the lower air pipe, and a plurality of lower air outlet holes are provided on the side of the lower air pipe away from the upper air pipe; both the upper air pipe and the lower air pipe are connected to an external air supply source.

[0008] A bag mouth flattening mechanism is installed on one side of the connecting rod.

[0009] The bag mouth flattening mechanism includes a side rod, a mounting seat one, a bolt one, and a pressing plate; the side rod is fixedly installed on one side of the connecting rod, the mounting seat one is fixedly installed on one side of the side rod, the bolt one is screwed into the mounting seat one, and the bolt one penetrates through the mounting seat one; a through hole with a diameter larger than the diameter of the bolt one is provided on the pressing plate, and the bolt one is inserted into the through hole; a locknut is screwed at the end of the bolt one; an elastic stretching assembly for keeping the pressing plate in an inclined state all the time is provided between the pressing plate and the side rod.

[0010] The elastic stretching assembly includes a mounting seat two, a bolt two, and a spring one; the mounting seat two is fixedly installed on one side of the side rod, the bolt two is screwed into the mounting seat two, and the bolt two penetrates through the mounting seat two; one end of the spring one is fixedly installed at the end of the bolt two, the other end of the spring one is fixedly installed on the pressing plate, and the connection position of the spring one and the pressing plate is on the pressing plate on the side of the through hole away from the mounting seat two.

[0011] The driving mechanism includes a bracket one, a cylinder one, a mounting plate, and two slide bars one; the bracket one is fixedly installed on the frame body, the two slide bars one are fixedly installed above the bracket one, and two through holes corresponding to the two slide bars one in one-to-one correspondence are provided on the mounting plate; the cylinder one is fixedly installed on the bracket one, and the piston end of the cylinder one is fixedly installed on the mounting plate.

[0012] The bag mouth rotating assembly includes two rollers, a rotating driving part for driving the two rollers to rotate synchronously and in the same direction, and a hinged driving part for driving the rollers to move towards the outside of the frame body.

[0013] The bag tail rotation assembly includes a lifting drive part for lifting the bag tail of the woven bag from the conveying mechanism and a translation drive part for driving the lifting drive part to move back and forth along the conveying direction.

[0014] The articulated drive part includes a second cylinder, a V-shaped connecting piece and a support rod; the support rod is fixedly installed on one side of the mounting plate, and the second cylinder is rotatably installed between the support rod and the mounting plate; the V-shaped corner of the V-shaped connecting piece is rotatably installed at the lower end of the support rod, one end of the V-shaped connecting piece is rotatably connected to the piston end of the second cylinder, the other end of the V-shaped connecting piece is rotatably installed with a rotating shaft, a roller is fixedly installed at one end of the rotating shaft close to the woven bag mouth support mechanism, and the other end of the rotating shaft is connected to the drive end of the rotation drive part.

[0015] The lifting drive part includes an upper support plate, a lower support plate, a second motor and a second mounting box; the upper support plate is fixedly installed at the drive end of the translation drive part, a third cylinder is installed below the upper support plate, and the lower support plate is fixedly installed at the piston end of the third cylinder; the second motor is fixedly installed below the lower support plate, and the second mounting box is fixedly connected to the output shaft of the second motor; clamping plates three are installed on both sides of the second mounting box through elastic components, a second turntable is arranged on the second mounting box on one side of the clamping plate three, a double-shaft motor is installed in the second mounting box, and the two shaft ends of the double-shaft motor are fixedly connected to the two second turntables in one-to-one correspondence; a second rotating arm is fixedly installed on the circumferential surface of the second turntable, and a clamping plate four that can contact the clamping plate three is fixedly installed at the end of the second rotating arm.

[0016] The conveying mechanism includes two electric slide rails symmetrically installed below the frame body, a first mounting box installed on the slider of the electric slide rail, a first motor, a first turntable, a first rotating arm, a clamping plate one and a clamping plate two; the first mounting box is fixedly installed on the slider, the first motor is fixedly installed on one side of the first mounting box, and the output shaft of the first motor penetrates through the first mounting box and extends into it; the first turntable is fixedly installed on the output shaft of the first motor, the first rotating arm is fixedly installed on one side of the first turntable, the clamping plate one is fixedly installed at the end of the first rotating arm, and a clamping plate two that can contact the clamping plate one is fixedly installed on the first mounting box; a long slot hole is opened on the frame body above the electric slide rail, the clamping plate two is located in the long slot hole, and the top end face of the clamping plate two is flush with the top end face of the frame body.

[0017] Beneficial effects

[0018] The advantages of the present invention are as follows:

[0019] 1. A bag mouth expanding mechanism mainly composed of an upper air pipe and a lower air pipe is provided. After the two air pipes enter the bag mouth, an external air supply source supplies air to the air pipes. The gas will blow out from the air outlet holes and blow towards the bag mouth, so that the bag mouth is expanded more evenly, avoiding the problem that due to the uneven surface of the outer bag and the gaps between the knitting strips, it is easy to cause unstable adsorption of the inner bag due to continuous air leakage during the adsorption process of the expanding mechanism, resulting in its dropping. It plays a role in preventing the problem that the inner and outer bags are easy to drop after being separated on both sides, and improves the reliability of production.

[0020] 2. A bag mouth flattening mechanism is arranged on one side of the ultrasonic sewing mechanism, so that the part to be sewn of the bag mouth is first flattened and then sewn, which can effectively avoid the unevenness caused by the gaps between the inner and outer bags not fitting during the flipping process, resulting in the problem that the welded part of the inner and outer bags after ultrasonic welding is not beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the sewing device of the present invention;

[0022] Figure 2 is a partial structural schematic diagram of the conveying mechanism of the present invention;

[0023] Figure 3 is Figure 1 an enlarged structural schematic diagram at position A in

[0024] Figure 4 is Figure 3 an enlarged structural schematic diagram at position C in

[0025] Figure 5 is Figure 1 an enlarged structural schematic diagram at position B in

[0026] Figure 6 is a cross-sectional view of the installation structure of the sleeve and the clamping disc III of the present invention.

[0027] Wherein: 1 - frame body, 2 - conveying mechanism, 3 - opening mechanism, 4 - ultrasonic sewing mechanism, 5 - woven bag mouth-opening mechanism, 6 - bag mouth rotating assembly, 7 - bag tail rotating assembly, 8 - driving mechanism, 9 - bag mouth flattening mechanism, 10 - photoelectric switch, 11 - conveyor belt, 12 - driving device, 13 - guiding plate, 14 - material receiving mechanism, 21 - electric slide rail, 22 - first installation box, 23 - first motor, 24 - first turntable, 25 - first rotating arm, 26 - first clamping plate, 27 - second clamping plate, 28 - long slot hole, 31 - fourth cylinder, 32 - first sealing air pipe, 33 - second sealing air pipe, 34 - sliding rod, 35 - suction cup, 36 - second air hole, 41 - sixth cylinder, 42 - ultrasonic welding device, 43 - supporting platform, 51 - connecting rod, 52 - upper air pipe, 53 - lower air pipe, 54 - air outlet hole, 61 - roller, 62 - second cylinder, 63 - V-shaped connecting piece, 64 - supporting rod, 65 - third motor, 66 - driven wheel, 67 - transmission belt, 71 - upper supporting plate, 72 - lower supporting plate, 73 - second motor, 74 - second installation box, 75 - third cylinder, 76 - third clamping plate, 77 - second turntable, 78 - second rotating arm, 79 - fourth clamping plate, 710 - second bracket, 711 - fifth cylinder, 712 - installation sliding plate, 713 - second sliding rod, 714 - sleeve, 715 - second spring, 716 - movable rod, 717 - limiting ring, 81 - first bracket, 82 - first cylinder, 83 - installation plate, 84 - first sliding rod, 91 - side rod, 92 - first installation seat, 93 - first bolt, 94 - pressing plate, 95 - second installation seat, 96 - second bolt, 97 - first spring. Detailed implementation manner

[0028] The following describes the present invention in further detail in conjunction with embodiments, but does not constitute any limitation to the present invention. Any limited modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0029] Refer to Figure 1 , a sewing device for inner and outer bags of a woven bag according to the present invention, includes a frame body 1 installed with a conveying mechanism 2, an opening mechanism 3, a rotating and turning bag mechanism, a woven bag mouth-opening mechanism 5 used in cooperation with the opening mechanism, an ultrasonic sewing mechanism 4, and a leveling and blanking mechanism. One side of the end of the frame body 1 is set as a feeding end, and the woven bag is placed on the frame body 1 through the feeding end. On the other side of the end of the frame body 1, there is a photoelectric switch 10 for detecting whether a woven bag is placed on the frame body 1. If a woven bag is placed on the frame body 1, the photoelectric switch 10 sends a signal to the PLC, and the PLC will start the conveying mechanism 2 to convey the woven bag.

[0030] The conveying mechanism 2 is used to convey the woven bag with an inner bag sleeved in the outer bag to the opening mechanism. Refer to Figure 2, the conveying mechanism 2 includes two electric slide rails 21 symmetrically installed under the frame 1, a first mounting box 22 installed on the slider of the electric slide rail 21, a first motor 23, a first turntable 24, a first rotating arm 25, a first clamping disc 26 and a second clamping disc 27. The first mounting box 22 is fixedly installed on the slider, the first motor 23 is fixedly installed on one side of the first mounting box 22, and the output shaft of the first motor 23 penetrates through the first mounting box 22 and extends into it. The first turntable 24 is fixedly installed on the output shaft of the first motor 23, the first rotating arm 25 is fixedly installed on one side of the first turntable 24, the first clamping disc 26 is fixedly installed at the end of the first rotating arm 25, and a second clamping disc 27 that can contact and completely fit with the first clamping disc 26 after contact is fixedly installed on the first mounting box 22. A long slot hole 28 is opened on the frame 1 above the electric slide rail 21, the second clamping disc 27 is located in the long slot hole 28, and the top end face of the second clamping disc 27 is flush with the top end face of the frame 1.

[0031] When the photoelectric switch 10 sends a signal to the PLC, the PLC will send a signal to the motor controller of the first motor 23 to make the first motor 23 act, driving the first rotating arm 25 and the first clamping disc 26 to rotate. When the first clamping disc 26 contacts the second clamping disc 27, the tail of the woven bag can be clamped. After the clamping disc clamps the woven bag, the electric slide rail 21 starts. Under the driving action of the electric slide rail 21, the woven bag will be conveyed to the rotating bag-turning mechanism of the sewing device.

[0032] After the woven bag is conveyed to the rotating bag-turning mechanism, the opening mechanism 3 acts first. Among them, the opening mechanism 3 is used to open the bag mouth of the end of the woven bag to be sewn, and open the bag mouths of the inner bag and the outer bag at the same time.

[0033] Refer to Figure 3 , the opening mechanism 3 of this embodiment includes a fourth cylinder 31, a first sealed air pipe 32 and a second sealed air pipe 33. The fourth cylinder 31 is fixedly arranged on the first bracket 81, and the first sealed air pipe 32 is fixedly installed at the end of the fourth cylinder 31. Two sliding rods 34 are fixedly installed above the first sealed air pipe 32, and the sliding rods 34 are movably inserted through the first bracket 81. A plurality of first air holes are opened on one side of the first sealed air pipe 32 away from the fourth cylinder 31, and suction cups 35 are installed in the first air holes. The second sealed air pipe 33 is fixedly installed in the frame 1 below the first sealed air pipe 32, and the surface of the second sealed air pipe 33 is flush with the surface of the frame 1. A plurality of second air holes 36 are opened on one side of the second sealed air pipe 33 close to the first sealed air pipe 32, and both the first sealed air pipe 32 and the second sealed air pipe 33 are connected to an external vacuum pump.

[0034] After the woven bag stops being conveyed, the fourth cylinder 31 operates to drive the first sealed air pipe 32 to move downward. After the piston rod of the fourth cylinder 31 extends to the longest, the fourth cylinder 31 stops operating. At this time, the suction cup 35 will press on the woven bag. Then, start the vacuum pump to evacuate the sealed air pipe through the vacuum pump. Since the inner bag is a plastic bag made of plastic film and is not air-permeable, by evacuating the two sealed air pipes, both sides of the woven bag can be adsorbed on the corresponding sealed air pipes respectively. When the fourth cylinder 31 operates to contract its piston rod, the upper side of the woven bag will be lifted, so that the bag mouth of the woven bag opens.

[0035] The rotary bag-turning mechanism consists of a bag-mouth rotary component 6 and a bag-tail rotary component 7, and is used to drive the whole woven bag to rotate around its center line. The bag-mouth rotary component 6 is movably installed on the frame 1 on one side of the opening mechanism 3 through a driving mechanism 8. The woven-bag mouth-opening mechanism 5 is installed on the driving mechanism 8 so that the woven-bag mouth-opening mechanism 5 can be inserted into the opening mechanism 3.

[0036] Among them, the driving mechanism 8 includes a first bracket 81, a first cylinder 82, a mounting plate 83, and two first slide rods 84. The first bracket 81 is fixedly installed on the frame 1, the two first slide rods 84 are fixedly installed above the first bracket 81, and two through holes corresponding to the two first slide rods 84 are opened on the mounting plate 83. The first cylinder 82 is fixedly installed on the first bracket 81, and the piston end of the first cylinder 82 is fixedly installed on the mounting plate 83.

[0037] Through the telescopic movement of the first cylinder 82, the mounting plate 83 and the bag-mouth rotary component 6 and the woven-bag mouth-opening mechanism 5 installed on the mounting plate 83 can be driven to move back and forth, so as to realize the bag-mouth rotary component 6 and the woven-bag mouth-opening mechanism 5 entering or exiting the bag mouth.

[0038] Refer to Figure 4 , the woven-bag mouth-opening mechanism 5 includes a connecting rod 51, an upper air pipe 52, and a lower air pipe 53. The connecting rod 51 is fixedly installed on the mounting plate 83, and the connecting rod 51 extends to the side of the bag-mouth rotary component 6 close to the opening mechanism 3, so that when the driving mechanism 8 drives the woven-bag mouth-opening mechanism 5 and the bag-mouth rotary component 6 to move towards the woven bag, the woven-bag mouth-opening mechanism 5 first enters the bag mouth. The upper air pipe 52 and the lower air pipe 53 are both fixedly installed at the end of the connecting rod 51. A plurality of upper air outlet holes 54 are opened on the side of the upper air pipe 52 away from the lower air pipe 53, and a plurality of lower air outlet holes are opened on the side of the lower air pipe 53 away from the upper air pipe 52. The upper air pipe 52 and the lower air pipe 53 are both connected to an external air supply source.

[0039] After the piston rod of the first cylinder 82 of the driving mechanism 8 extends and the woven bag mouth-opening mechanism 5 enters the bag mouth, an external air supply source supplies air to the air pipe. The gas will blow out from the air outlet holes and blow towards the bag mouth, so that the bag mouth is opened more evenly, avoiding the problem that due to the uneven surface of the outer bag and the gaps between the woven strips, the adsorption mechanism 3 is prone to unstable adsorption of the inner bag due to continuous air leakage during the adsorption process and causing it to fall off.

[0040] The bag mouth rotation assembly 6 of this embodiment includes two rollers 61, a rotation driving part for driving the two rollers 61 to rotate synchronously and in the same direction, and a hinge driving part for driving the rollers 61 to move outward from the frame body 1. The bag tail rotation assembly 7 includes a lifting driving part for lifting the bag tail of the woven bag from the conveying mechanism 2 and a translation driving part for driving the lifting driving part to move back and forth along the conveying direction.

[0041] Specifically, the rotation driving part includes a third motor 65, a driving wheel, a driving wheel and two driven wheels 66. The third motor 65 is installed on one side of the mounting plate 83, and the output shaft of the third motor 65 penetrates the mounting plate 83. The driving wheel is fixedly installed at the end of the output shaft of the third motor 65. The driving wheel is installed on the mounting plate 83 on one side of the driving wheel. The hinge driving part includes a second cylinder 62, a V-shaped connecting piece 63 and a support rod 64. The support rod 64 is fixedly installed on one side of the mounting plate 83, and the second cylinder 62 is rotatably installed between the support rod 64 and the mounting plate 83. The V-shaped corner of the V-shaped connecting piece 63 is rotatably installed at the lower end of the support rod 64. One end of the V-shaped connecting piece 63 is rotatably connected to the piston end of the second cylinder 62. A rotating shaft is rotatably installed at the other end of the V-shaped connecting piece 63. A roller 61 is fixedly installed at the end of the rotating shaft close to the woven bag mouth-opening mechanism 5, and a driven wheel 66 is fixedly installed at the other end of the rotating shaft. The driving wheel, the tensioning wheel and the two driven wheels 66 are connected by a transmission belt 67.

[0042] Refer to Figure 5 and Figure 6, the translation drive unit includes a second bracket 710, a fifth cylinder 711, and a mounting slide plate 712. The lifting drive unit includes an upper support plate 71, a lower support plate 72, a third cylinder 75, a second motor 73, and a second mounting box 74. The second bracket 710 is fixedly installed on the frame 1, the fifth cylinder 711 is fixedly installed on the second bracket 710, and the upper support plate 71 is fixedly installed at the end of the piston rod of the fifth cylinder 711. The upper support plate 71 is fixedly connected to the mounting slide plate 712, and the mounting slide plate 712 is slidably installed above the second bracket 710. A third cylinder 75 is installed below the upper support plate 71, and the lower support plate 72 is fixedly installed at the piston end of the third cylinder 75. Four second slide rods 713 are also fixedly installed below the upper support plate 71. The second slide rods 713 penetrate through the lower support plate 72, and the second slide rods 713 are slidably connected to the penetrated parts. The second motor 73 is fixedly installed below the lower support plate 72, and the second mounting box 74 is fixedly connected to the output shaft of the second motor 73. To ensure stability, the output shaft of the second motor 73 can be connected to the lower support plate 72 through a bearing block.

[0043] Sleeves 714 are fixedly installed on both sides of the second mounting box 74. A movable rod 716 is movably inserted into the sleeves 714. Limiting rings 717 are provided on the inner wall below the sleeves 714 and the outer wall above the movable rod 716. There is an interference surface between the two limiting rings 717, thus preventing the movable rod 716 from falling out of the sleeves 714. A third clamping plate 76 is fixedly installed below the movable rod 716. A second spring 715 is sleeved on the movable rod 716 between the third clamping plate 76 and the sleeves 714, so that the two clamping plates have a buffering function when clamping the woven bag. A second turntable 77 is provided on the second mounting box 74 on one side of the third clamping plate 76. A dual-axis motor is installed in the second mounting box 74, and the two shaft ends of the dual-axis motor are fixedly connected to the two second turntables 77 in a one-to-one correspondence. A second rotating arm 78 is fixedly installed on the circumferential surface of the second turntable 77, and a fourth clamping plate 79 that can contact the third clamping plate 76 is fixedly installed at the end of the second rotating arm 78. In addition, the frame 1 below the second mounting box 74 is in a hollow shape, so that the third clamping plate 76 and the fourth clamping plate 79 can clamp the woven bag.

[0044] When the piston rod of cylinder 82 of the driving mechanism 8 extends, the roller 61 enters the bag opening, and after the woven bag mouth expanding mechanism 5 operates, the piston rod of cylinder 62 will extend. At the same time, the piston rod of cylinder 711 also extends. The extension of the piston rod of cylinder 62 can cause the V-shaped connecting piece 63 to rotate, thereby driving the roller 61 to move outward on the frame body 1 and finally contact the inner wall of the bag opening. The extension of the piston rod of cylinder 75 can cause the second mounting box 74 to descend, and when the piston rod of cylinder 75 extends to the longest, the third clamping plate 76 contacts the woven bag. After the operation of cylinder 75 is in place, the dual-axis motor will start, driving the fourth clamping plate 79 to rotate and finally form a clamp on the tail of the woven bag with the third clamping plate 76. Then, the piston rod of cylinder 75 contracts until the transmission gap between the tail of the woven bag and the conveyor belt group is on the same horizontal plane. At this time, the third motor 65 and the second motor 73 are started simultaneously. The third motor 65 drives the roller 61 to rotate to realize the flipping of the bag opening, and the second motor 73 drives the second mounting box 74 to rotate to realize the flipping of the bag tail, and the flipping directions of the bag opening and the bag tail are the same, so as to realize the flipping of the woven bag.

[0045] To avoid the problem that the non-flatness caused by the gap between the inner and outer bags not fitting well during the flipping process leads to an unattractive welded joint between the inner and outer bags after ultrasonic welding, the present invention installs a bag mouth flattening mechanism 9 on one side of the connecting rod 51, and the bag mouth flattening mechanism 9 is located on one side of the ultrasonic sewing mechanism 4, so that the part of the bag mouth to be sewn first passes through the flattening of the bag mouth flattening mechanism 9 and then is welded and sewn.

[0046] Specifically, the bag mouth flattening mechanism 9 includes a side rod 91, a first mounting seat 92, a first bolt 93 and a pressing plate 94. The side rod 91 is fixedly installed on one side of the connecting rod 51, the first mounting seat 92 is fixedly installed on one side of the side rod 91, the first bolt 93 is screwed into the first mounting seat 92, and the first bolt 93 penetrates through the first mounting seat 92. The pressing plate 94 is in an L-shaped structure. A through hole with a diameter larger than the diameter of the first bolt 93 is opened on the pressing plate 94, and the first bolt 93 is inserted into the through hole. A locknut is screwed at the end of the first bolt 93. An elastic stretching component is provided between the pressing plate 94 and the side rod 91 to keep the pressing plate 94 always in an inclined state. The pressing plate 94 inclines away from the opening mechanism 3, and the position where the pressing plate 94 contacts the woven bag has a distance slightly larger than the thickness of one side of the woven bag from the surface of the frame body 1. For example, if the sum of the wall thicknesses of one side of the inner bag and one side of the outer bag is 0.2 mm, the distance between the pressing plate 94 and the frame body 1 can be 0.3 mm or 0.4 mm.

[0047] After the roller 61 enters the bag opening, the position of the pressing plate 94 is at the sewing place of the bag opening. When the rotating bag flipping mechanism drives the woven bag to flip, the pressing plate 94 will flatten the sewing place.

[0048] In this embodiment, the elastic stretching component includes a second mounting base 95, a second bolt 96, and a first spring 97. The second mounting base 95 is fixedly installed on one side of the side rod 91, and the second mounting base 95 is located above the pressing plate 94. The second bolt 96 is screwed into the second mounting base 95, and the second bolt 96 penetrates through the second mounting base 95. One end of the first spring 97 is fixedly installed at the end of the second bolt 96, and the other end of the first spring 97 is fixedly installed on the pressing plate 94. The connection between the first spring 97 and the pressing plate 94 is located on the pressing plate 94 on the side of the through hole away from the second mounting base 95.

[0049] Since the second mounting base 95 is located above the pressing plate 94, after the first spring 97 is installed, it is in an inclined state. And the connection between the first spring 97 and the pressing plate 94 is located on the pressing plate 94 on the side of the through hole away from the second mounting base 95. Therefore, when the first spring 97 is in a stretched state, one end of the pressing plate 94 is stressed, causing it to be in an inclined state. The setting of the second bolt 96 can be used to adjust the stretching length of the first spring 97, thereby changing the acting force of the first spring 97 on the pressing plate 94.

[0050] The ultrasonic sewing mechanism 4 is used to sew the mouth of the woven bag during rotation to sew the mouths of the inner bag and the outer bag.

[0051] Specifically, the ultrasonic sewing mechanism 4 includes a sixth cylinder 41, an ultrasonic welding device 42, and a support platform 43. The sixth cylinder 41 is installed below the mounting plate 83. The ultrasonic welding device 42 is installed at the end of the piston rod of the sixth cylinder 41 through a cross bar. The support platform 43 is arranged in the second sealing air pipe 33 to divide the second sealing air pipe 33 into two sections.

[0052] After the first cylinder 82 of the driving mechanism 8 stops operating, the ultrasonic welding device 42 will be located above the support platform 43. Then the sixth cylinder 41 operates to lower the ultrasonic welding device 42 to a position where it can sew the mouth of the woven bag. When the woven bag is driven to rotate by the rotary bag turning mechanism, the ultrasonic welding device 42 works simultaneously to sew the mouth of the woven bag.

[0053] It should be noted that the ultrasonic welding device 42 described in this embodiment and its application in sewing the mouth of the woven bag are both prior arts, so no more discussion will be made herein.

[0054] The leveling and blanking mechanism is used to convey the woven bag after the inner bag and the outer bag are sewn and level the woven bag during conveyance. Among them, the leveling and blanking mechanism includes a leveling mechanism and a blanking mechanism.

[0055] Such as Figure 1As shown in the figure, the leveling mechanism of this embodiment consists of eight conveyor belts 11 and a driving device 12 for driving the conveyor belts 11. The eight conveyor belts 11 are evenly distributed and arranged side by side vertically. Two conveyor belts 11 arranged side by side vertically form a conveyor belt group, and the conveying directions of the adjacent conveying surfaces of the two conveyor belts 11 in the conveyor belt group are the same. The driving device 12 includes a reduction motor and a connecting shaft installed on the output shaft of the reduction motor. The connecting shaft is connected to the conveyor belt 11 located on the same horizontal plane to drive the conveyor belt 11.

[0056] The feeding ends of the conveyor belt groups on both sides of the frame 1 are located behind the feeding ends of the two conveyor belt groups in the frame 1. When the translation driving part drives the bag tail rotating assembly 7 holding the sewn woven bag to move towards the leveling mechanism, the woven bag contacts the feeding ends of the two conveyor belt groups in the frame 1, so as to realize that the woven bag enters the conveyor belt group for leveling and conveying.

[0057] Since the woven bag is a flexible bag, its two end corners will droop. To ensure that the end corners of the woven bag can enter the conveyor belt groups on both sides of the frame 1, inclined guiding plates 13 are provided in front of the feeding ends of the conveyor belt groups on both sides of the frame 1 to guide the end corners of the woven bag into the conveyor belt groups on both sides of the frame 1.

[0058] It should be noted that in this embodiment, the feeding end of the conveyor belt 11 is regarded as the front.

[0059] Regarding the material receiving mechanism 14, its specific structure and working principle are both prior arts, and the present invention does not improve it, so this article will not discuss it further.

[0060] The working principle of the present invention is:

[0061] First step: The woven bag with the bag mouth to be sewn is put into the frame 1 through the feeding end. When the photoelectric switch 10 detects that a woven bag is placed on the frame 1, the first motor 23 operates to drive the first rotating arm 25 and the first clamping disc 26 to rotate to clamp the bag tail of the woven bag. After clamping the woven bag, the electric slide rail 21 is started. Under the driving action of the electric slide rail 21, the woven bag will be conveyed to the rotary bag turning mechanism.

[0062] Second step: When the woven bag is conveyed to the rotary bag turning mechanism and the electric slide rail 21 stops operating, the fourth cylinder 31 operates to drive the first sealing air pipe 32 to move downward, and after the piston rod of the fourth cylinder 31 extends to the longest, the fourth cylinder 31 stops operating. At this time, the suction cup 35 will press on the woven bag. Then start the vacuum pump to evacuate the sealing air pipe through the vacuum pump, so that both sides of the woven bag are adsorbed on the corresponding sealing air pipes respectively. When the fourth cylinder 31 resets, the upper side of the woven bag will be lifted, so that the bag mouth of the woven bag opens.

[0063] Step 3: After the bag opening of the woven bag is opened, start cylinder 1 82, and extend its piston rod to move the bag mouth rotation assembly 6 and the woven bag mouth support mechanism 5 towards the bag mouth, and make the bag mouth rotation assembly 6 and the woven bag mouth support mechanism 5 enter the bag mouth.

[0064] Step 4: After cylinder 1 82 stops operating, start an external air supply source, such as an air pump. Supply air to the air pipe through the external air supply source. The gas will be blown out from the air outlet holes and blown towards the bag mouth, so that the bag mouth is more evenly opened.

[0065] Step 5: Start cylinder 2 62 and cylinder 3 75 simultaneously, and extend their piston rods. The extension of the piston rod of cylinder 2 62 can make the V-shaped connecting piece 63 rotate, thereby driving the roller 61 to move towards the outside of the frame body 1 and finally contacting the inner wall of the bag mouth. The extension of the piston rod of cylinder 3 75 can make the second mounting box 74 descend, and when the piston rod of cylinder 3 75 extends to the longest, the third clamping disc 76 contacts the woven bag. After cylinder 3 75 operates in place, the dual-axis motor will start, driving the fourth clamping disc 79 to rotate and finally forming a clamp on the tail of the woven bag with the third clamping disc 76. And after the fourth clamping disc 79 and the third clamping disc 76 clamp the tail of the woven bag, the first motor 23 operates in reverse, driving the first clamping disc 26 to reset, so that the first clamping disc 26 is separated from the second clamping disc 27, releasing the clamp on the bag tail.

[0066] Then, the piston rod of cylinder 3 75 contracts until the transmission gap between the tail of the woven bag and the conveyor belt group is at the same horizontal plane. Cylinder 6 41 operates. And after cylinder 6 41 is in place, start the third motor 65, the second motor 73 and the ultrasonic welding device 42 simultaneously. The third motor 65 drives the roller 61 to rotate to realize the flipping of the bag mouth, and the second motor 73 drives the second mounting box 74 to rotate to realize the flipping of the bag tail, and the flipping directions of the bag mouth and the bag tail are the same, so as to realize the flipping of the woven bag. And during the flipping process of the woven bag, the ultrasonic welding device performs spot welding of the inner bag and the outer bag on the periphery of the bag mouth of the woven bag.

[0067] Step 6: After the woven bag flips one week and the bag mouth sewing process of the woven bag is completed, the second motor 73 and the third motor 65 stop operating simultaneously, and cylinders 6 41, 2 62, and 1 82 are reset in sequence to move the bag mouth rotation assembly 6 and the woven bag mouth support mechanism 5 out of the bag mouth. The vacuum pump stops working.

[0068] Step 7: The cylinder five 711 of the translation driving part operates, and its piston rod contracts, so that the bag tail rotating assembly 7 clamping the woven bag moves towards the leveling mechanism. When the woven bag enters the two conveyor belt groups in the frame 1, the dual-axis motor operates in reverse to reset the clamping disc four to release the clamping of the woven bag. And after the release, the piston rod of the cylinder three 75 resets. Then, the cylinder five 711 stops operating and resets. Among them, the contraction speed of the piston rod of the cylinder five 711 is preferably consistent with the conveying speed of the conveyor belt 11, and the distance between two adjacent conveyor belts 11 on the left and right should be greater than the diameter of the clamping disc four 79.

[0069] During the process of the woven bag being conveyed by the leveling mechanism, the gas in the bag can be discharged by the conveying and squeezing of the conveyor belt group on the woven bag, so as to realize the leveling of the woven bag.

[0070] After the woven bag is conveyed out of the leveling mechanism, it will enter the material receiving mechanism 14, and the collection of the woven bag is realized through the material receiving mechanism.

[0071] In the working principle of the above stitching device, the control of the motors, cylinders and electric slide rails 21 involved is all completed by the PLC. Although the structure of the stitching device of the present invention has been improved, its control process is the same as that of the woven bag stitching mechanism in the prior art, and the present invention does not improve this control process.

[0072] In the present invention, the above-mentioned fixed installation can adopt any known fixed connection method, such as bolt connection, welding, etc. The fixed installation in this embodiment is preferably realized by welding.

[0073] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these will not affect the implementation effect of the present invention and the practicability of the patent.

Claims

1. A sewing device for the inner and outer bags of a woven bag, comprising a frame (1) equipped with a conveying mechanism (2), an opening mechanism (3), an ultrasonic sewing mechanism (4), and a leveling and blanking mechanism, characterized in that, It further includes a rotary bag-turning mechanism and a woven bag mouth-opening mechanism (5) used in cooperation with the opening mechanism (3); the rotary bag-turning mechanism is composed of a bag mouth rotary assembly (6) and a bag tail rotary assembly (7); the bag mouth rotary assembly (6) is movably installed on the frame (1) on one side of the opening mechanism (3) through a driving mechanism (8), and the woven bag mouth-opening mechanism (5) is installed on the driving mechanism (8) so that the woven bag mouth-opening mechanism (5) can be inserted into the opening mechanism (3). The woven bag mouth-opening mechanism (5) includes a connecting rod (51), an upper air pipe (52) and a lower air pipe (53); the connecting rod (51) is fixedly installed on the driving mechanism (8), and the connecting rod (51) extends to the side of the bag mouth rotary assembly (6) close to the opening mechanism (3); the upper air pipe (52) and the lower air pipe (53) are both fixedly installed at the end of the connecting rod (51), a plurality of upper air outlet holes (54) are formed on the side of the upper air pipe (52) away from the lower air pipe (53), and a plurality of lower air outlet holes are formed on the side of the lower air pipe (53) away from the upper air pipe (52); the upper air pipe (52) and the lower air pipe (53) are both connected to an external air supply source. The conveying mechanism (2) includes two electric slide rails (21) symmetrically installed below the frame (1), an installation box one (22) installed on the slider of the electric slide rail (21), a motor one (23), a turntable one (24), a rotating arm one (25), a clamping disc one (26) and a clamping disc two (27); the installation box one (22) is fixedly installed on the slider, the motor one (23) is fixedly installed on one side of the installation box one (22), and the output shaft of the motor one (23) penetrates through the installation box one (22) and extends into it; the turntable one (24) is fixedly installed on the output shaft of the motor one (23), the rotating arm one (25) is fixedly installed on one side of the turntable one (24), the clamping disc one (26) is fixedly installed at the end of the rotating arm one (25), and a clamping disc two (27) that can contact the clamping disc one (26) is fixedly installed on the installation box one (22); a long slot hole (28) is formed on the frame (1) above the electric slide rail (21), the clamping disc two (27) is located in the long slot hole (28), and the top end face of the clamping disc two (27) is flush with the top end face of the frame (1).

2. The stitching device for inner and outer bags of a woven bag according to claim 1, characterized in that, A bag mouth flattening mechanism (9) is installed on one side of the connecting rod (51).

3. A stitching device for the inner and outer bags of a woven bag according to claim 2, characterized in that, The bag mouth flattening mechanism (9) includes side rods (91), first mounting seats (92), first bolts (93), and pressing plates (94); the side rods (91) are fixedly mounted on one side of the connecting rod (51), the first mounting seats (92) are fixedly mounted on one side of the side rods (91), the first bolts (93) are screwed into the first mounting seats (92), and the first bolts (93) penetrate through the first mounting seats (92); through holes with a diameter larger than the diameter of the first bolts (93) are formed in the pressing plates (94), and the first bolts (93) are inserted into the through holes; anti-loosening nuts are screwed at the ends of the first bolts (93); an elastic stretching assembly for keeping the pressing plates (94) in an inclined state all the time is arranged between the pressing plates (94) and the side rods (91).

4. A stitching device for the inner and outer bags of a woven bag according to claim 3, characterized in that, The elastic stretching assembly includes second mounting seats (95), second bolts (96), and first springs (97); the second mounting seats (95) are fixedly mounted on one side of the side rods (91), the second bolts (96) are screwed into the second mounting seats (95), and the second bolts (96) penetrate through the second mounting seats (95); one end of the first spring (97) is fixedly mounted at the end of the second bolt (96), the other end of the first spring (97) is fixedly mounted on the pressing plate (94), and the connection position of the first spring (97) and the pressing plate (94) is on the pressing plate (94) on the side away from the second mounting seat (95) of the through hole.

5. A stitching device for the inner and outer bags of a woven bag according to claim 1, characterized in that, The driving mechanism (8) includes a first bracket (81), a first cylinder (82), a mounting plate (83), and two first slide rods (84); the first bracket (81) is fixedly mounted on the frame body (1), the two first slide rods (84) are fixedly mounted above the first bracket (81), through holes corresponding to the two first slide rods (84) for sliding connection are formed in the mounting plate (83); the first cylinder (82) is fixedly mounted on the first bracket (81), and the piston end of the first cylinder (82) is fixedly mounted on the mounting plate (83).

6. The stitching device for the inner and outer bags of a woven bag according to claim 5, characterized in that, The bag mouth rotating assembly (6) includes two rollers (61), a rotation driving part for driving the two rollers (61) to rotate synchronously and in the same direction, and a hinge driving part for driving the rollers (61) to move outward from the frame body (1). The bag tail rotating assembly (7) includes a lifting driving part for lifting the bag tail of the woven bag from the conveying mechanism (2) and a translation driving part for driving the lifting driving part to move back and forth along the conveying direction.

7. A sewing device for the inner and outer bags of a woven bag according to claim 6, characterized in that, The articulated driving part includes a second cylinder (62), a V-shaped connecting piece (63) and a supporting rod (64); the supporting rod (64) is fixedly installed on one side of the mounting plate (83), and the second cylinder (62) is rotatably installed between the supporting rod (64) and the mounting plate (83); the V-shaped corner of the V-shaped connecting piece (63) is rotatably installed at the lower end of the supporting rod (64), one end of the V-shaped connecting piece (63) is rotatably connected to the piston end of the second cylinder (62), a rotating shaft is rotatably installed at the other end of the V-shaped connecting piece (63), a roller (61) is fixedly installed at one end of the rotating shaft close to the woven bag mouth expanding mechanism (5), and the other end of the rotating shaft is connected to the driving end of the rotating driving part.

8. A stitching device for the inner and outer bags of a woven bag according to claim 6, characterized in that, The lifting driving part includes an upper supporting plate (71), a lower supporting plate (72), a second motor (73) and a second mounting box (74); the upper supporting plate (71) is fixedly installed at the driving end of the translational driving part, a third cylinder (75) is installed below the upper supporting plate (71), and the lower supporting plate (72) is fixedly installed at the piston end of the third cylinder (75); the second motor (73) is fixedly installed below the lower supporting plate (72), and the second mounting box (74) is fixedly connected to the output shaft of the second motor (73); clamping discs three (76) are installed on both sides of the second mounting box (74) through elastic components, a second turntable (77) is arranged on the second mounting box (74) on one side of the clamping disc three (76), a double-shaft motor is installed in the second mounting box (74), and the two shaft ends of the double-shaft motor are fixedly connected to the two second turntables (77) in one-to-one correspondence; a second rotating arm (78) is fixedly installed on the circumferential surface of the second turntable (77), and a clamping disc four (79) that can contact the clamping disc three (76) is fixedly installed at the end of the second rotating arm (78).

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