A kind of automatic folding machine for woven bag mouth and production method

Abstract

The present invention discloses an automatic folding machine for the mouth of a woven bag and a production method, comprising a frame, on which are provided an opening mechanism for the woven bag to be sleeved and open, a folding mechanism for folding the edge of the bag mouth and a bonding mechanism for bonding the folded portion; the opening mechanism comprises two support rods arranged relatively at intervals and an opening drive device for driving the two support rods to move relative to each other; when the woven bag is sleeved on the two support rods, the opening drive device will drive the two support rods to move relative to each other to open the woven bag, and the folding mechanism will fold the folded portion of the bag mouth along the folding line so that the folded portion is tightly attached to the inner side of the woven bag, and at this time the bonding mechanism will bond the folded portion to realize automatic folding of the mouth of the woven bag, thereby improving production efficiency, saving labor costs and increasing production capacity, and at the same time making the folding width of the mouth of the woven bag more flat and uniform, thereby improving product quality.

Description

Technical Field

[0001] The invention relates to woven bag manufacturing equipment, and more specifically, to an automatic folding machine for woven bag openings and a production method. Background Art

[0002] Woven bags are a kind of packaging bags formed by drawing and weaving chemical raw materials such as polyethylene and polypropylene. They are now widely used in the packaging and transportation of cement, fertilizer, chemicals and other products.

[0003] After the woven bag is covered with the inner membrane, it needs to be folded at one end to form a window structure. The existing technology usually folds the window manually, which leads to low processing efficiency of the valve mouth woven bag and the folding width is prone to unevenness, affecting product quality. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide an automatic folding machine for the mouth of a woven bag and a production method.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An automatic folding machine for the mouth of a woven bag comprises a frame, on which an opening mechanism for covering the woven bag and opening it is arranged, a folding mechanism for folding the edge of the bag mouth, and a gluing mechanism for gluing the folded portion;

[0007] The spreading mechanism comprises two support rods arranged relatively spaced apart from each other and a spreading driving device for driving the two support rods to move relative to each other;

[0008] When the woven bag is put on the two support rods, the expansion drive device will drive the two support rods to move relative to each other to expand the woven bag, and the folding mechanism will fold the folded part of the bag mouth along the folding line so that the folded part is tightly attached to the inner side of the woven bag. At this time, the bonding mechanism will bond the folded part.

[0009] The present invention is further provided with: a support head is provided at one end of the support rod, and a support rod rotating device is provided at the other end for driving the support rod to rotate; when the support rod rotating device drives the support rod to rotate, it drives the woven bag to rotate relative to the folding mechanism, and rotates the part of the bag mouth where the folding is completed to the bonding mechanism for bonding.

[0010] The present invention further provides: the support rod rotating device includes a rotating frame, a linkage rod and a rotating motor driving the linkage rod to rotate on the rotating frame, the linkage rod is provided with a first gear portion, the support rod is provided with a second gear portion meshing with the first gear portion, and the rotating motor drives the support rod to rotate through the linkage rod.

[0011] The present invention further provides that: the length of the first gear portion is greater than that of the second gear portion, so that the second gear portion moves forward and backward along the length direction of the first gear portion.

[0012] The present invention further provides that: the rotating frame is provided with a first stroke driver and a second stroke driver for driving the support rod to move forward and backward, the telescopic shaft of the first stroke driver is connected to the support rod, and the second stroke driver is connected to the first stroke driver through a linkage plate.

[0013] The present invention is further configured as follows: a pushing mechanism is also arranged on the frame, the pushing mechanism comprises two clamping assemblies and a pushing driving assembly, and the two clamping assemblies correspond to the two support rods one by one;

[0014] When the two support rods open the woven bag, the pressing assembly will press the outer bag of the woven bag, and the pushing drive assembly will drive the pressing assembly and the support rods to move relative to each other, so that the outer bag and the inner film bag of the woven bag move relative to each other.

[0015] The present invention further provides that: the pushing drive assembly includes a pushing track and a pushing driver that drives the clamping assembly to move along the pushing track, and the pushing track is arranged along the length direction of the support rod.

[0016] The present invention further provides that: the clamping assembly includes a clamping arm and a clamping driver for driving the clamping arm to approach the support rod;

[0017] The pressing drive is fixed on the conveying shaft of the pushing drive through a connecting plate, and the connecting plate is arranged on the pushing track.

[0018] The present invention is further provided that: the expansion drive device includes two support bases, an expansion track, a bidirectional screw and an expansion motor that drives the bidirectional screw to rotate, the support rod is arranged on the support base, and the two support bases are respectively matched with the bidirectional screw through screw sleeves. When the expansion motor drives the bidirectional screw to rotate, the support rods on the two support bases are driven away from each other on the expansion track to expand the bag opening of the woven bag.

[0019] The present invention further provides that: a folding mechanism is provided on one side of each of the two support rods, so that the two folding mechanisms can fold the upper and lower parts of the bag opening of the woven bag respectively.

[0020] The present invention further provides that: the folding mechanism includes a first folding component and a second folding component;

[0021] The first folding component is placed on the side of the woven bag, and the second folding component is arranged opposite to the bag opening of the woven bag;

[0022] The first folding assembly folds the folded portion of the bag opening along the folding line in the radial direction for the first time, so that the folded portion is aligned with the second folding assembly; at this time, the second folding assembly folds the folded portion that has been folded for the first time along the folding line for the second time, so that the folded portion is tightly attached to the inner side of the woven bag.

[0023] The present invention is further provided that: the first folding component includes a first upper folding component and a first lower folding component, the first upper folding component and the first lower folding component are arranged relatively to each other up and down, and the first upper folding component and the first lower folding component respectively fold the folding parts of the upper and lower sides of the bag opening of the woven bag for the first time along the folding line in the radial direction.

[0024] The present invention further provides that: the first upper folding assembly includes a first upper folding plate and a first upper folding driver driving the first upper folding plate to move downward;

[0025] The first lower folding assembly includes a first lower folding plate and a first lower folding driver for driving the first lower folding plate to move upward;

[0026] The first lower folding plate is arranged opposite to the first upper folding plate, and the first upper folding plate can move downward to fold the folded portion of the upper edge of the bag opening downward along the folding line, and the first lower folding plate can move upward to fold the folded portion of the lower edge of the bag opening upward along the folding line, so that the folded portion of the bag opening is folded for the first time along the folding line.

[0027] The present invention is further provided that: the first upper folding plate and the first lower folding plate both include a horizontal folding plate and a vertical folding plate that are perpendicular to each other. When the first upper folding plate and the first lower folding plate are folded for the first time, the horizontal folding plate will be tightly attached to the outside of the woven bag, so that the folded part of the bag opening is folded along the folding line and tightly attached to the vertical folding plate.

[0028] The present invention further provides that: the second folding assembly includes a second folding plate and a second folding driver driving the second folding plate to move forward and backward toward the bag opening;

[0029] When the folding portion of the bag opening completes the first folding, the second folding driver will drive the second folding plate to move forward toward the bag opening, and fold the folding portion along the folding line for the second time, so that the folding portion is tightly attached to the inner side of the woven bag.

[0030] The present invention is further provided that: the second folding plate includes a second folding plate body, and an upper limiting plate and a lower limiting plate are respectively arranged on both sides of the second folding plate body, and the second folding plate body will push the folding part to perform a second fold along the folding line. At this time, the upper edge of the bag opening is placed between the second folding plate body and the upper limiting plate, and the lower edge of the bag opening is placed between the second folding plate body and the lower limiting plate.

[0031] The present invention further provides that: the second folding plate body is provided with a guide portion, and the sides of the upper limiting plate and the lower limiting plate facing the second folding plate body are both provided with guide chamfers.

[0032] The present invention further provides that: an auxiliary support rod is arranged between the two support rods, an auxiliary support head is arranged at one end of the auxiliary support rod, and an auxiliary support rod rotating motor is arranged at the other end for driving the auxiliary support rod to rotate.

[0033] The present invention further provides that: an auxiliary support driver for driving the auxiliary support rod to move forward and backward is arranged on the frame.

[0034] The present invention further provides: the auxiliary support head includes a conical guide head and a support frame, the conical guide head is placed in front of the support frame, wherein the support frame is fixed to the auxiliary support rod, and the conical guide head is rotatably arranged on the auxiliary support rod through a bearing.

[0035] The present invention further provides that: the number of the fixing mechanisms is two, and the two fixing mechanisms correspond one to one to the two support rods.

[0036] The present invention further provides that: the bonding mechanism includes a spot welder and a bonding position adjustment track for moving the spot welder, and when the folded portion of the woven bag is tightly attached to the inner side of the woven bag, the welding head of the spot welder will bond the folded portion of the woven bag.

[0037] The present invention also provides a production method of an automatic folding machine for woven bag openings, the production method comprising the following steps:

[0038] Step 1: Put the woven bag on the two support rods of the expansion mechanism;

[0039] Step 2: Opening the woven bag: the opening driving device drives the two support rods to move away from each other, so that the two support rods are respectively against the two sides of the woven bag to open the woven bag;

[0040] Step 3: Folding the woven bag opening: The folding mechanism folds the folded portion of the bag opening along the folding line so that the folded portion is closely attached to the inner side of the woven bag;

[0041] Step 4: Fixing the folded part of the woven bag mouth: driving the woven bag to rotate relative to the folding mechanism, and rotating the folded part of the bag mouth to the fixing mechanism for fixing;

[0042] Step 5: After the folded part of the woven bag opening is glued, the opening drive device will drive the two support rods to move closer to the initial position, and remove the woven bag from the opening mechanism.

[0043] The production method is further arranged that in step two, when the two support rods stretch the woven bag, the clamping driver drives the clamping arm to clamp the outer bag of the woven bag, and the pushing clamping arm will drive the clamping assembly to move relative to the support rod, so that the outer bag and the inner film bag of the woven bag move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time the clamping arm is released, and the support rod returns to the folding mechanism with the woven bag.

[0044] The production method is further arranged that, in step two, when the two support rods stretch the woven bag, the clamping driver drives the clamping arm to clamp the outer bag of the woven bag, and the second stroke driver moves the support rod forward and relative to the clamping arm, so that the outer bag and the inner film bag of the woven bag move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time the clamping arm is released, and the support rod returns to the folding mechanism with the woven belt.

[0045] The production method is further arranged that in step three, the first folding component folds the folded portion of the bag opening for a first time along the folding line in the radial direction so that the folded portion is aligned with the second folding component; at this time, the second folding component folds the folded portion that has been folded for the first time for a second time along the folding line so that the folded portion is tightly attached to the inner side of the woven bag.

[0046] The beneficial effects of the present invention are as follows: In the present invention, the portion of the edge of the woven bag mouth that needs to be folded is called a folding portion, and the crease at the connection between the folding portion and the woven bag is called a folding line. Through the technical solution of the present invention, the woven bag can be put on two support rods and move relatively to open the woven bag. The folding mechanism folds the folding portion of the bag mouth along the folding line so that the folding portion is tightly attached to the inner side of the woven bag. At this time, the bonding mechanism will bond the folding portion to realize automatic folding of the bag mouth of the woven bag, improve production efficiency, save labor costs and increase production capacity. At the same time, the folding width of the bag mouth of the woven bag is also made flatter and more uniform, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The structure of the automatic folding machine for woven bag mouth of the present invention is shown in FIG. Figure 1 ;

[0048] Figure 2 The structure of the automatic folding machine for woven bag mouth of the present invention is shown in FIG. Figure 2 ;

[0049] Figure 3 It is a schematic diagram of the structure of the propping drive device;

[0050] Figure 4 Schematic diagram of the assembly structure of the support rod and the support rod rotating device, the folding mechanism, the clamping assembly and the pushing drive assembly Figure 1

[0051] Figure 5Schematic diagram of the assembly structure of the support rod and the support rod rotating device, the folding mechanism, the clamping assembly and the pushing drive assembly Figure 2 ;

[0052] Figure 6 It is a schematic diagram of the assembly structure of the support rod and the linkage rod;

[0053] Figure 7 is a schematic diagram of the structure of the auxiliary support rod;

[0054] Figure 8 is a structural schematic diagram of the folding mechanism;

[0055] Fig. 9 It is a schematic diagram of the assembly structure of the pressing component and the pushing drive component;

[0056] Fig.10 This is a schematic diagram of the structure of a woven bag.

[0057] Explanation of the reference numerals: 1. frame; 2. opening mechanism; 21. support rod; 211. support head; 212. second gear portion; 22. opening drive device; 221. support base; 222. opening track; 223. bidirectional screw; 224. opening motor; 23. support rod rotating device; 231. rotating frame; 232. linkage rod; 2321. first gear portion; 233. rotating motor; 234. first stroke driver; 235. second stroke driver; 24. auxiliary support rod; 241. auxiliary support head; 2411. conical guide head; 2412. support frame; 25. auxiliary support driver; 26. auxiliary support rod rotating motor; 3. folding mechanism; 31. first folding assembly; 311. first upper folding assembly ;3111, first upper folding plate;3112, first upper folding drive;312, first lower folding assembly;3121, first lower folding plate;3122, first lower folding drive;32, second folding assembly;321, second folding plate;3211, second folding plate body;3212, upper limiting plate;3213, lower limiting plate;322, second folding drive;2000, horizontal folding plate;3000, vertical folding plate;4, bonding mechanism;41, spot welding machine;42, bonding position adjustment track;5, clamping assembly;51, clamping arm;52, clamping drive;53, connecting plate;6, pushing drive assembly;61, pushing track;62, pushing drive;7, woven bag;71, folding part;72, folding line. DETAILED DESCRIPTION

[0058] See attached Figures 1 to 10 The automatic folding machine for woven bag opening and the production method of the present invention are further described in detail.

[0059] For ease of explanation, the woven bag 7 is composed of an outer bag and an inner film bag, and the portion at the edge of the woven bag 7 that needs to be folded is called a folding portion 71, and the fold at the connection between the folding portion 71 and the woven bag 7 is called a folding line 72.

[0060] from Figure 1 and Figure 2 It can be seen that an automatic folding machine for the mouth of a woven bag 7 includes a frame 1, on which are provided an opening mechanism 2 for the woven bag 7 to be mounted and open, a folding mechanism 3 for folding the edge of the bag mouth, and a bonding mechanism 4 for bonding the folded portion; the bonding mechanism 4 includes a spot welder 41 and a bonding position adjustment track 42 for moving the spot welder, wherein the spot welder can be moved by the bonding position adjustment track 42, thereby adjusting the relative position of the spot welding of the spot welder 41, and when the folded portion 71 of the woven bag 7 is tightly attached to the inner side of the woven bag 7, the welding head of the spot welder 41 will bond the folded portion 71 of the woven bag 7, wherein the spot welder 41 is a prior art and will not be described in detail here.

[0061] The opening mechanism 2 includes two support rods 21 arranged at a relative interval and an opening driving device 22 for driving the two support rods 21 to move relative to each other; when the woven bag 7 is sleeved on the two support rods 21, the opening driving device 22 will drive the two support rods 21 to move away from each other, so that the two support rods 21 are respectively against the two sides of the woven bag 7, and the woven bag 7 is automatically opened. Figure 3 It can be seen that the expansion drive device 22 includes two support bases 221, an expansion track 222, a bidirectional screw 223 and an expansion motor 224 for driving the bidirectional screw 223 to rotate. The support rod 21 is arranged on the support base 221, and the two support bases 221 are respectively matched with the bidirectional screw 223 through screw sleeves. When the expansion motor 224 drives the bidirectional screw 223 to rotate, the support rods 21 on the two support bases 221 are driven to move away from each other on the expansion track 222 to expand the bag mouth of the woven bag 7. Precise transmission is achieved through the screw and the screw sleeve, so that the moving speed of the two support rods 21 remains consistent, thereby preventing the woven bag 7 from shifting to one side during the expansion process.

[0062] from Figure 4 and Figure 5 It can be seen that one end of the support rod 21 is provided with a support head 211, and the other end is provided with a support rod rotating device 23 for driving the support rod 21 to rotate. The support rod rotating device 23 includes a rotating frame 231, a linkage rod 232 and a rotating motor 233 for driving the linkage rod 232 to rotate on the rotating frame 231. Figure 6It can be seen that the linkage rod 232 is provided with a first gear portion 2321, and the support rod 21 is provided with a second gear portion 212 meshing with the first gear portion 2321. The rotating motor 233 drives the support rod 21 to rotate through the linkage rod 232. In order for the two support rods 21 to simultaneously push the woven bag 7 to rotate, the rotation speeds of the two support rod rotating devices 23 are kept consistent. When the support rod rotating device 23 drives the support rod 21 to rotate, it will drive the woven bag 7 to rotate, thereby realizing the rotation of the woven bag 7 on the support rod 21, which is convenient for the automatic folding of the bag mouth of the woven bag 7.

[0063] The length of the first gear portion 2321 is greater than that of the second gear portion 212 , so that the second gear portion 212 can move forward and backward along the length direction of the first gear portion 2321 , and the support rod 21 can move forward and backward relative to the linkage rod 232 .

[0064] from Figure 4 and Figure 5 It can be seen that the rotating frame 231 is provided with a first stroke driver 234 and a second stroke driver 235 for driving the support rod 21 to move forward and backward, the telescopic shaft of the first stroke driver 234 is connected to the support rod 21, and the second stroke driver 235 is connected to the first stroke driver 234 through a linkage plate, wherein the first stroke driver 234 drives the support rod 21 to move forward, so that the woven bag 7 is sleeved on the two support rods 21, and the second stroke driver 235 drives the support rod 21 to move forward again, in order to push the inner film bag of the woven bag 7 to move inward, so that the inner film bag of the woven belt is flush with the bag opening of the outer bag.

[0065] An auxiliary support rod 24 is arranged between the two support rods 21, wherein the two support rods 21 and the auxiliary support rod 24 are on the same horizontal plane, and the auxiliary support rod 24 supports the bag opening of the woven bag 7 to prevent the inner film bag and the outer bag of the woven bag 7 from drooping downward, so that the inner film bag and the outer bag remain bonded together, which is convenient for folding the bag opening, and an auxiliary support driver 25 for driving the auxiliary support rod 24 to move forward and backward is also arranged on the frame 1, and the auxiliary support driver 25 can push the auxiliary support rod 24 to move to the desired position, so that the bag opening of the woven bag 7 can be better supported.

[0066] from Figure 7It can be known that an auxiliary support head 241 is arranged at one end of the auxiliary support rod 24, and an auxiliary support rod rotating motor 26 is arranged at the other end to drive the auxiliary support rod 24 to rotate. The auxiliary support head 241 includes a conical guide head 2411 and a support frame 2412, wherein the conical guide head 2411 is placed in front of the support frame 2412, wherein the support frame 2412 is fixed to the auxiliary support rod 24, and the conical guide head 2411 is rotatably arranged on the auxiliary support rod 24 through a bearing, and the width of the support frame 2412 is smaller than the diameter of the large end face of the conical guide head 2411. When the auxiliary support head 241 moves forward to the desired position for weaving When the bag 7 is being supported, the conical guide head 2411 plays a guiding role, which facilitates the auxiliary support head 241 to be inserted into the bag opening of the woven bag 7. At this time, the auxiliary support rod rotating motor 26 can drive the auxiliary support rod 24 to rotate ninety degrees, so that the support frame 2412 is in a vertical state, which supports the bag opening of the woven bag 7 and facilitates the folding of the bag opening. After completing the supporting role, the auxiliary support rod rotating motor 26 can drive the auxiliary support rod 24 to rotate ninety degrees in the opposite direction, so that the support frame 2412 is in a horizontal state, thereby releasing the support for the bag opening of the woven bag 7, thereby effectively preventing the auxiliary support head 241 from hindering the rotation of the woven bag 7.

[0067] from Fig. 9 It can be known that when the two support rods 21 stretch the woven bag 7, in order to keep the inner and outer bag openings of the woven bag 7 flush, a pushing mechanism is provided on the frame 1, and the pushing mechanism includes two clamping components 5 and a pushing drive component 6, and the two clamping components 5 correspond to the two support rods 21 one by one; when the two support rods 21 stretch the woven bag 7, the clamping component 5 will clamp the outer bag of the woven bag 7, and the pushing drive component 6 will drive the clamping component 5 and the support rods 21 to move relative to each other, so that the outer bag and the inner bag of the woven bag 7 move relative to each other, so that the outer bag and the inner bag of the woven bag 7 move relative to each other, so that the bag openings of the outer bag and the inner bag are flush, the structure is simple, and the relative positions of the outer bag and the inner bag are automatically adjusted to keep the bag openings flush.

[0068] The pushing drive assembly 6 includes a pushing rail 61 and a pushing drive 62 that drives the clamping assembly 5 to move along the pushing rail 61. The pushing rail 61 is set along the length direction of the support rod 21, so as to realize the relative movement of the clamping assembly 5 and the support rod 21, thereby realizing automatic adjustment of the relative positions of the outer bag and the inner membrane bag. At the same time, the support rod 21 can also be driven forward again by the second stroke drive 235, so as to realize the relative movement of the clamping assembly 5 and the support rod 21, thereby realizing automatic adjustment of the relative positions of the outer bag and the inner membrane bag.

[0069] The clamping assembly 5 includes a clamping arm 51 and a clamping driver 52 that drives the clamping arm 51 to approach the support rod 21; the clamping driver 52 is fixed to the conveying shaft of the pushing driver 62 through a connecting plate 53, and the connecting plate 53 is arranged on the pushing track 61, so that the movement of the clamping assembly 5 is more stable and reliable, wherein the clamping surface of the clamping arm 51 is provided with an anti-slip layer, when the clamping arm 51 clamps the woven bag 7, the friction between the two is increased, which facilitates the pushing of the woven bag 7 to move, and at the same time, the clamping surface of the clamping arm 51 is adapted to the support rod 21, which can effectively improve the pushing force of the clamping arm 51 and also facilitate the pushing of the woven bag 7 to move.

[0070] When the inner and outer bag openings of the woven bag 7 are flush, the folding mechanism 3 folds the folding portion 71 of the bag opening along the folding line 72 so that the folding portion 71 is tightly attached to the inner side of the woven bag 7. For folding efficiency, the number of the folding mechanisms 3 is set to two, wherein the two folding mechanisms 3 correspond one-to-one to the two support rods 21, so that the two folding mechanisms 3 fold the upper and lower parts of the bag opening of the woven bag 7 respectively, and also the support rod 21 does not need to drive the woven bag 7 to rotate a full circle relative to the folding mechanism 3 to realize the folding of the woven belt bag opening in one circle, but only needs to rotate half a circle to complete the folding of the bag opening, thereby improving production efficiency.

[0071] from Figure 8 It can be seen that the folding mechanism 3 includes a first folding component 31 and a second folding component 32. The first folding component 31 is placed on the side of the woven bag 7, and the folding portion 71 of the bag opening is folded for the first time along the folding line 72, so that the folding portion 71 is aligned with the second folding component 32; the second folding component 32 is arranged opposite to the bag opening of the woven bag 7, and the folding portion 71 that has been folded for the first time is folded for the second time along the folding line 72, so that the folding portion 71 is tightly attached to the inner side of the woven bag 7, thereby realizing automatic folding of the bag opening of the woven bag 7.

[0072] The first folding assembly 31 includes a first upper folding assembly 311 and a first lower folding assembly 312. The first upper folding assembly 311 includes a first upper folding plate 3111 and a first upper folding driver 3112 for driving the first upper folding plate 3111 to move downward; the first lower folding assembly 312 includes a first lower folding plate 3121 and a first lower folding driver 3122 for driving the first lower folding plate 3121 to move upward; the first lower folding plate 3121 is arranged opposite to the first upper folding plate 3111, the first upper folding plate 3111 can move downward to fold the folding portion 71 of the upper edge of the bag opening downward along the folding line 72, and the first lower folding plate 3121 can move upward to fold the folding portion 71 of the lower edge of the bag opening upward along the folding line 72, so that the folding portion 71 of the bag opening is folded for the first time along the folding line 72. The structure is simple, so that the upper edge and the lower edge of the bag opening can achieve the first folding at the same time, thereby improving the folding efficiency.

[0073] The first upper folding plate 3111 and the first lower folding plate 3121 both include a horizontal folding plate 2000 and a vertical folding plate 3000 which are perpendicular to each other. When the first upper folding plate 3111 and the first lower folding plate 3121 are folded for the first time, the horizontal folding plate 2000 will be tightly attached to the outer side of the woven bag 7, so that the folding portion 71 of the bag mouth is folded along the folding line 72 and tightly attached to the vertical folding plate 3000, realizing the first folding of the folding portion 71. One end of the horizontal folding plate 2000 is tilted upward, so that during the rotation of the woven bag 7, the horizontal folding plate 2000 can effectively avoid interference with the woven bag 7.

[0074] The second folding assembly 32 includes a second folding plate 321 and a second folding driver 322 that drives the second folding plate 321 to move forward and backward toward the bag opening; the second folding plate 321 includes a second folding plate body 3211, and an upper limiting plate 3212 and a lower limiting plate 3213 are respectively arranged on both sides of the second folding plate body 3211. When the folding portion 71 of the bag opening completes the first folding, the second folding driver 322 will drive the second folding plate 321 to move forward toward the bag opening, and the second folding plate body 3211 will push the folding portion 71 to perform a second folding along the folding line 72, so that the folding portion 71 is tightly attached to the inner side of the woven bag 7. At this time, the upper edge of the bag opening is placed between the second folding plate body 3211 and the upper limiting plate 3212, and the lower edge of the bag opening is placed between the second folding plate body 3211 and the lower limiting plate 3213, thereby completing the folding action of the bag opening of the woven bag 7.

[0075] The second folding plate body 3211 is provided with a guide portion, and the upper limiting plate 3212 and the lower limiting plate 3213 are provided with guide chamfers on the sides facing the second folding plate body 3211, so as to facilitate the upper edge of the bag opening to be placed between the second folding plate body 3211 and the upper limiting plate 3212, and also to facilitate the lower edge of the bag opening to be placed between the second folding plate body 3211 and the lower limiting plate 3213.

[0076] When the mouth of the woven bag 7 is folded by the folding mechanism 3, the opening mechanism 2 will drive the woven bag 7 to rotate, and rotate the folded part of the bag mouth to the bonding mechanism 4 for bonding, wherein the number of the bonding mechanisms 4 is also two, and the two bonding mechanisms 4 correspond one to one with the two support rods 21, so that the folded part of the bag mouth can be bonded in time through the bonding mechanism 4 through the folding mechanism 3, thereby improving the bonding effect.

[0077] Working process: the two support rods 21 move forward to the desired position under the action of the first stroke driver 234 so that the woven bag 7 can be sleeved on the two support rods 21. At this time, the opening drive device 22 will drive the two support rods 21 to move away from each other, so that the two support rods 21 respectively abut against the two side edges of the woven bag 7, and the woven bag 7 is automatically opened. The clamping arm 51 will clamp the outer bag of the woven bag 7, and the pushing drive assembly 6 will drive the clamping assembly 5 to move relative to the support rods 21, or move forward relative to the clamping assembly 5 under the action of the second stroke driver 235, so that the outer bag and the inner film bag of the woven bag 7 move relative to each other, so that the outer bag and the inner film bag of the woven bag 7 move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush; at this time, the clamping arm 51 will release the clamping action on the outer bag of the woven bag 7, and the two support rods 21 will move backward under the action of the first stroke driver 234 and be placed at the folding mechanism, waiting to be folded;

[0078] The folding mechanism 3 uses the first folding component 31 to fold the folding portion 71 of the bag opening in the radial direction along the folding line 72 for the first time, so that the folding portion 71 is aligned with the second folding component 32; the second folding component 32 is arranged opposite to the bag opening of the woven bag 7, and the folding portion 71 that has been folded for the first time is folded for the second time along the folding line 72, so that the folding portion 71 is tightly attached to the inner side of the woven bag 7, and at the same time, the rotating motor 233 drives the support rod 21 to rotate through the linkage rod 232, thereby driving the woven bag 7 to rotate relative to the folding mechanism 3, and rotates the folded part of the bag opening to the bonding mechanism 4 for bonding, thereby realizing automatic folding of the bag opening of the woven bag 7, improving production efficiency, saving labor costs and increasing production capacity, and also making the folding width of the bag opening of the woven bag 7 more flat and uniform, thereby improving product quality.

[0079] The present invention also provides a production method of an automatic folding machine for woven bag openings, the production method comprising the following steps:

[0080] Step 1: Woven bag installation: The woven bag is installed on the two support rods 21 of the opening mechanism 2. To facilitate the installation of the woven bag 7, the two support rods 21 can be driven forward to the desired position by the first stroke driver 234, so that there is enough space to install the woven bag 7 on the two support rods 21;

[0081] Step 2: Open the woven bag 7: The opening driving device 22 drives the two support rods 21 to move away from each other, so that the two support rods 21 are respectively against the two side edges of the woven bag 7 to open the woven bag 7. In order to avoid deviation during the opening process, an opening structure in which the two support rods 21 move to both sides at the same time is adopted, and the moving speed of the two support rods 21 is kept consistent through a screw transmission method;

[0082] When the woven bag 7 is opened, in order to keep the inner film bag and the outer bag opening of the woven bag 7 flush with each other to facilitate folding of the bag opening, the present invention adopts two methods:

[0083] The first method: after the clamping driver 52 drives the clamping arm 51 to clamp the outer bag of the woven bag 7, the push driving assembly 6 drives the clamping arm 51 and the support rod 21 to move relative to each other, so that the outer bag and the inner film bag of the woven bag 7 move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time, the clamping arm 51 is released, and the support rod 21 returns to the folding mechanism;

[0084] The second method: after the clamping driver 52 drives the clamping arm 51 to clamp the outer bag of the woven bag 7, the second stroke driver 235 moves the support rod 21 forward and moves relative to the clamping arm 51, so that the outer bag and the inner film bag of the woven bag 7 move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time the clamping arm 51 is released, and the support rod 21 returns to the folding mechanism 3 with the woven belt;

[0085] Step 3: Folding the opening of the woven bag 7: The folding mechanism folds the folded portion of the bag opening along the folding line so that the folded portion is closely attached to the inner side of the woven bag 7; the specific folding method is:

[0086] The first folding assembly 31 folds the folded portion of the bag opening along the folding line in the radial direction for the first time, so that the folded portion is aligned with the second folding assembly 32; at this time, the second folding assembly 32 folds the folded portion after the first folding along the folding line for the second time, so that the folded portion is closely attached to the inner side of the woven bag 7;

[0087] Step 4: Adhesion of the folded portion of the woven bag 7: The two support rods 21 are driven respectively, thereby driving the woven bag 7 to rotate relative to the folding mechanism 3, and rotating the folded portion of the bag to the adhesion mechanism 4 for adhesion;

[0088] Step 5: After the folded part of the woven bag 7 is glued, the opening drive device 22 drives the two support rods 21 to move closer to the initial position, and the woven bag 7 is removed from the opening mechanism.

[0089] Through the above production method, the woven bag 7 can be automatically folded, replacing manual operation and improving production efficiency.

[0090] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An automatic folding machine for woven bag openings, comprising a frame, characterized in that: The frame is provided with an opening mechanism for covering the woven bag and opening it, a folding mechanism for folding the edge of the bag opening, and a bonding mechanism for bonding the folded portion; The spreading mechanism comprises two support rods arranged relatively spaced apart from each other and a spreading driving device for driving the two support rods to move relative to each other; The folding mechanism includes a first folding assembly and a second folding assembly; the first folding assembly is placed on the side of the woven bag, and the second folding assembly is arranged opposite to the bag opening of the woven bag; the first folding assembly folds the folded portion of the bag opening along the folding line in the radial direction for the first time, so that the folded portion is aligned with the second folding assembly; at this time, the second folding assembly folds the folded portion that has been folded for the first time along the folding line for the second time, so that the folded portion is closely attached to the inner side of the woven bag; The bonding mechanism includes a spot welder and a bonding position adjustment track for the spot welder to move. When the folded portion of the woven bag is tightly attached to the inner side of the woven bag, the welding head of the spot welder will bond the folded portion of the woven bag. When the woven bag is put on the two support rods, the expansion drive device will drive the two support rods to move relative to each other to expand the woven bag, and the folding mechanism will fold the folded part of the bag mouth along the folding line so that the folded part is tightly attached to the inner side of the woven bag. At this time, the bonding mechanism will bond the folded part.

2. The automatic folding machine for woven bag opening according to claim 1 is characterized in that: A support head is provided at one end of the support rod, and a support rod rotating device is provided at the other end to drive the support rod to rotate. When the support rod rotating device drives the support rod to rotate, it will drive the woven bag to rotate relative to the folding mechanism, and rotate the folded part of the bag opening to the bonding mechanism for bonding.

3. The automatic folding machine for woven bag opening according to claim 2 is characterized in that: The support rod rotating device includes a rotating frame, a linkage rod and a rotating motor driving the linkage rod to rotate on the rotating frame, the linkage rod is provided with a first gear portion, the support rod is provided with a second gear portion meshing with the first gear portion, and the rotating motor drives the support rod to rotate through the linkage rod.

4. The automatic folding machine for woven bag opening according to claim 3 is characterized in that: The length of the first gear portion is greater than that of the second gear portion, so that the second gear portion moves forward and backward along the length direction of the first gear portion.

5. The automatic folding machine for woven bag opening according to claim 4 is characterized in that: The rotating frame is provided with a first stroke driver and a second stroke driver for driving the support rod to move forward and backward, the telescopic shaft of the first stroke driver is connected to the support rod, and the second stroke driver is connected to the first stroke driver through a linkage plate.

6. The automatic folding machine for woven bag openings according to claim 1, 2, 3, 4 or 5, characterized in that: A pushing mechanism is also provided on the frame, and the pushing mechanism includes two pressing assemblies and a pushing driving assembly, and the two pressing assemblies correspond to the two supporting rods one by one; When the two support rods open the woven bag, the pressing assembly will press the outer bag of the woven bag, and the pushing drive assembly will drive the pressing assembly and the support rods to move relative to each other, so that the outer bag and the inner film bag of the woven bag move relative to each other.

7. The automatic folding machine for woven bag opening according to claim 6 is characterized in that: The pushing drive assembly comprises a pushing track and a pushing driver for driving the pressing assembly to move along the pushing track, and the pushing track is arranged along the length direction of the supporting rod.

8. The automatic folding machine for woven bag opening according to claim 7 is characterized in that: The clamping assembly includes a clamping arm and a clamping driver for driving the clamping arm to approach the support rod; The pressing drive is fixed on the conveying shaft of the pushing drive through a connecting plate, and the connecting plate is arranged on the pushing track.

9. The automatic folding machine for woven bag openings according to claim 1, 2, 3, 4 or 5, characterized in that: The expansion drive device includes two support bases, an expansion track, a bidirectional screw and an expansion motor that drives the bidirectional screw to rotate. The support rod is arranged on the support base, and the two support bases are respectively matched with the bidirectional screw through screw sleeves. When the expansion motor drives the bidirectional screw to rotate, the support rods on the two support bases are driven away from each other on the expansion track to expand the bag opening of the woven bag.

10. The automatic folding machine for woven bag openings according to claim 1, 2, 3, 4 or 5, characterized in that: One side of the two support rods is provided with a folding mechanism, so that the two folding mechanisms fold the upper and lower parts of the bag opening of the woven bag respectively.

11. The automatic folding machine for woven bag opening according to claim 1, characterized in that: The first folding assembly includes a first upper folding assembly and a first lower folding assembly, which are arranged opposite to each other up and down, and the first upper folding assembly and the first lower folding assembly respectively fold the folding parts of the upper and lower sides of the bag opening of the woven bag for the first time along the folding line in the radial direction.

12. The automatic folding machine for woven bag opening according to claim 11, characterized in that: The first upper folding assembly includes a first upper folding plate and a first upper folding driver driving the first upper folding plate to move downward; The first lower folding assembly includes a first lower folding plate and a first lower folding driver for driving the first lower folding plate to move upward; The first lower folding plate is arranged opposite to the first upper folding plate, and the first upper folding plate can move downward to fold the folded portion of the upper edge of the bag opening downward along the folding line, and the first lower folding plate can move upward to fold the folded portion of the lower edge of the bag opening upward along the folding line, so that the folded portion of the bag opening is folded for the first time along the folding line.

13. The automatic folding machine for woven bag opening according to claim 12, characterized in that: The first upper folding plate and the first lower folding plate both include a horizontal folding plate and a vertical folding plate that are perpendicular to each other. When the first upper folding plate and the first lower folding plate are folded for the first time, the horizontal folding plate will be tightly attached to the outside of the woven bag, so that the folded part of the bag opening is folded along the folding line and tightly attached to the vertical folding plate.

14. The automatic folding machine for woven bag openings according to claim 1, 11, 12 or 13, characterized in that: The second folding assembly includes a second folding plate and a second folding driver that drives the second folding plate to move forward and backward toward the bag opening; When the folding portion of the bag opening completes the first folding, the second folding driver will drive the second folding plate to move forward toward the bag opening, and fold the folding portion along the folding line for the second time, so that the folding portion is tightly attached to the inner side of the woven bag.

15. The automatic folding machine for woven bag opening according to claim 14, characterized in that: The second folding plate includes a second folding plate body, and an upper limiting plate and a lower limiting plate are respectively arranged on both sides of the second folding plate body. The second folding plate body will push the folding part to perform a second fold along the folding line. At this time, the upper edge of the bag opening is placed between the second folding plate body and the upper limiting plate, and the lower edge of the bag opening is placed between the second folding plate body and the lower limiting plate.

16. The automatic folding machine for woven bag opening according to claim 15, characterized in that: The second folding plate body is provided with a guide portion, and the sides of the upper limiting plate and the lower limiting plate facing the second folding plate body are both provided with guide chamfers.

17. The automatic folding machine for woven bag openings according to claim 1, 2, 3, 4 or 5, characterized in that: An auxiliary support rod is arranged between the two support rods, an auxiliary support head is arranged at one end of the auxiliary support rod, and an auxiliary support rod rotating motor is arranged at the other end for driving the auxiliary support rod to rotate.

18. The automatic folding machine for woven bag opening according to claim 17, characterized in that: An auxiliary support driver for driving the auxiliary support rod to move forward and backward is arranged on the frame.

19. The automatic folding machine for woven bag opening according to claim 18, characterized in that: The auxiliary support head comprises a conical guide head and a support frame, wherein the conical guide head is placed in front of the support frame, wherein the support frame is fixed to the auxiliary support rod, and the conical guide head is rotatably arranged on the auxiliary support rod through a bearing.

20. The automatic folding machine for woven bag opening according to claim 19, characterized in that: The number of the bonding mechanisms is two, and the two bonding mechanisms correspond one to one with the two support rods.

21. A production method using the automatic folding machine for woven bag openings according to any one of claims 1 to 20, characterized in that: The production method comprises the following steps: Step 1: Put the woven bag on the two support rods of the expansion mechanism; Step 2: Opening the woven bag: the opening driving device drives the two support rods to move away from each other, so that the two support rods are respectively against the two sides of the woven bag to open the woven bag; Step 3: Folding the woven bag opening: The folding mechanism folds the folded portion of the bag opening along the folding line so that the folded portion is closely attached to the inner side of the woven bag; Step 4: Fixing the folded part of the woven bag mouth: driving the woven bag to rotate relative to the folding mechanism, and rotating the folded part of the bag mouth to the fixing mechanism for fixing; Step 5: After the folded part of the woven bag opening is glued, the opening drive device will drive the two support rods to move closer to the initial position, and remove the woven bag from the opening mechanism.

22. The method for producing an automatic folding machine for woven bag openings according to claim 21, characterized in that: In step two, when the two support rods stretch the woven bag open, the clamping driver drives the clamping arm to clamp the outer bag of the woven bag, and the pushing drive assembly drives the clamping arm and the support rod to move relative to each other, so that the outer bag and the inner film bag of the woven bag move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time the clamping arm is released, and the support rod returns to the folding mechanism with the woven belt.

23. The method for producing an automatic folding machine for woven bag openings according to claim 21, characterized in that: In step two, when the two support rods stretch the woven bag open, the clamping driver drives the clamping arm to clamp the outer bag of the woven bag, and the second stroke driver moves the support rod forward and relative to the clamping arm, so that the outer bag and the inner film bag of the woven bag move relative to each other, so that the bag openings of the outer bag and the inner film bag are flush, and at the same time the clamping arm is released, and the support rod returns to the folding mechanism with the woven belt.

24. The method for producing an automatic folding machine for woven bag openings according to claim 21, characterized in that: In step three, the first folding component folds the folded portion of the bag opening along the folding line in the radial direction for the first time, so that the folded portion is aligned with the second folding component; at this time, the second folding component folds the folded portion that has been folded for the first time along the folding line for the second time, so that the folded portion is tightly attached to the inner side of the woven bag.

Images