A square-bottom folding device for a paper bag machine

Abstract

The present invention discloses a square-bottom folding device for a paper bag machine. The key points of its technical solution include a bottom-opening transmission mechanism. The bottom-opening transmission mechanism includes a rotating shaft, on which symmetrically arranged mounting seats are provided. An air suction disc is arranged between a pair of mounting seats. An eccentric transmission shaft for connecting a paper clip is provided on the mounting seat. The transmission shaft is rotationally connected to the mounting seat and can move horizontally; a driving wheel is provided on the rotating shaft, and a cam for controlling the swing of the paper clip is provided on one side of the driving wheel. A paper clip wheel cooperating with the cam is provided on the transmission shaft; a return spring is provided between the paper clip and the mounting seat; a push plate abutting against the transmission shaft is further provided on the driving wheel, and the push plate is used to drive the transmission shaft to translate towards the mounting seat. A spring is provided between the paper clip wheel and the mounting seat; the horizontal movement and swing rotation of the paper clip are realized through the push plate and the cam, making the structure simpler and facilitating subsequent debugging; at the same time, for some relatively thick paper bags, the horizontal movement of the paper clip reduces the swing space of the paper clip and shortens the lateral movement distance of the paper clip.

Description

Technical Field

[0001] The present invention relates to the technical field of paper bag machine equipment, and particularly relates to a square-bottom folding device for a paper bag machine. Background Art

[0002] Square-bottom paper bags are environmentally friendly, low-carbon, convenient to carry, simple to manufacture, and the materials are degradable, which plastics cannot compare with. In the era of advocating environmental protection, they have gradually become a common type of general packaging in people's lives. Currently, on the industrial production line of square-bottom paper bags, paper bag machines are mainly used. After processes such as paper clamping and bottom opening, paper clamping and bottom folding, the state diagram after the bottom of the paper bag is folded as shown in Figure 1 is formed; currently, the principle between the paper clip and the paper clamping wheel in the commonly used bottom-opening device by manufacturers is similar to the principle of a square-bottom paper bag bottom-opening device disclosed in the publication number (2021220329055). The paper clip is rotatably connected to the clip seat through a pin shaft, and then the swinging of the paper clip is realized through the paper clamping wheel and the paper clamping cam, so as to clamp the upper side edge 7 of the paper bag for subsequent bottom folding and bag opening;

[0003] However, during the transmission process, the stroke of the paper clip is limited to swinging rotation. Therefore, a large swinging space is required for clamping and positioning the upper edges on both sides of the paper tube. Moreover, for some relatively thick paper bags, it is sometimes difficult for the paper clip to enter between the two end faces of the paper bag, which may easily cause the paper clip to fail to clamp and position the upper side edge of the paper bag well, thus affecting the folding of the bag bottom and the production quality of the paper bag. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a square-bottom folding device for a paper bag machine, which can shorten the movement stroke of the paper clip and reduce the swinging space of the paper clip; at the same time, through a simple structure, when dealing with some relatively thick paper tubes, it is easier for the paper clip to enter between the two end faces of the paper bag.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a square-bottom folding device for a paper bag machine, including a frame, a large drum wheel, and a bottom-opening transmission mechanism. The bottom-opening transmission mechanism includes a rotating shaft, and mounting seats are symmetrically arranged on the rotating shaft. An air suction disc is arranged between a pair of the mounting seats. It is characterized in that a transmission shaft connecting the paper clip is eccentrically arranged on the mounting seat. The transmission shaft is rotatably connected to the mounting seat and can move horizontally; a driving wheel is also sleeved on the rotating shaft on one side of the mounting seat. A cam for controlling the swinging of the paper clip is arranged on the side of the driving wheel facing the mounting seat. A paper clamping wheel cooperating with the cam is arranged on the transmission shaft; a return spring is also arranged between the paper clip and the mounting seat; a push plate abutting against the transmission shaft is also arranged on the driving wheel. The push plate is used to drive the transmission shaft to translate towards the air suction disc direction. The paper clamping wheel is slidably connected to the mounting seat and can be elastically reset.

[0006] The present invention is further configured such that the mounting base includes fixed disks and paper clamping disks symmetrically arranged on both sides of the paper clip, and the paper clamping disks are located on the side of the paper clip facing the suction disk; an installation groove is formed between the paper clamping disks and the fixed disks, the paper clip is arranged in the installation groove through a transmission shaft, and one end of the transmission shaft penetrates through the fixed disk and abuts against the push plate, and the paper clamping wheel is fixed to the end of the transmission shaft where it abuts against the push plate.

[0007] The present invention is further configured such that the paper clip includes a swing arm fixedly connected to the transmission shaft at one end, and a clamping head is arranged on the swing arm, and the clamping head cooperates with the paper clamping disk to clamp the side edge of the paper bag.

[0008] The present invention is further configured such that a hook is arranged at the end of the swing arm far from the transmission shaft, one end of the return spring is connected to the hook, and the other end is connected to the mounting base.

[0009] The present invention is further configured such that a notch is arranged on the paper clamping disk.

[0010] The present invention is further configured such that adjusting plates are further arranged on a pair of the driving wheels, a lead screw is threadedly connected between the pair of adjusting plates, and the lead screw is used to control the mounting base to move towards or away from each other.

[0011] The present invention is further configured such that there are two cams arranged along the circumferential direction of the driving wheel; a convex portion for controlling the paper clip to swing away from the driving wheel is further arranged on a pair of the cams.

[0012] The present invention is further configured such that a pushing portion is extended and arranged on the side of the push plate facing the mounting base, and the pushing portion is located between the two convex portions.

[0013] The present invention is further configured such that the large drum wheel rotates in a direction opposite to that of the bottom-opening transmission mechanism, a plurality of adsorption seats are circumferentially arranged on the large drum wheel, a central clamp is arranged in the middle of the adsorption seats, and a pair of side clamps are arranged between the plurality of adsorption seats.

[0014] In summary, the beneficial effects of the present invention:

[0015] 1. The cooperation between the cam and the paper clamping wheel can achieve the swinging rotation of the paper clip, enabling the paper clip to clamp and release the side of the paper bag; the cooperation between the push plate and the transmission shaft can make the transmission shaft drive the paper clip to move horizontally on the mounting seat, thereby driving the paper clip to approach and move away from the side of the paper bag; during the process of clamping the upper side of the paper bag, the paper clip first moves horizontally towards the paper bag and swings upwards into the space between the sides of the paper bag, and then under the action of the return spring, the paper clip swings downwards to clamp and position the upper side of the paper bag; the above structure shortens the swinging stroke of the paper clip and reduces the swinging space of the paper bag, and for some relatively thick paper bags, a long horizontal movement space is not required; at the same time, first making the paper clip move horizontally towards the paper bag and swing upwards can make the clip head of the paper clip more easily enter the space between the sides of the paper bag, avoiding the situation that the paper clip fails to clamp the paper bag well and affecting the folding and forming of the bag bottom.

[0016] 2. Driving the swinging rotation and horizontal movement of the paper clip through the push plate and the cam makes the structure simpler, facilitates the debugging of the equipment, reduces the equipment debugging time when producing paper bags of different specifications, and improves the efficiency. Description of the Drawings

[0017] Figure 1 is the folding state diagram of the paper bag in this embodiment.

[0018] Figure 2 is the three-dimensional structure diagram of this embodiment.

[0019] Figure 3 is the three-dimensional diagram of the bottom-opening transmission mechanism in this embodiment.

[0020] Figure 4 is the enlarged view of the mounting seat in this embodiment.

[0021] Figure 5 is the cooperation diagram of the adjusting plate and the lead screw in this embodiment.

[0022] Figure 6 is the structural schematic diagram of the paper clip in this embodiment.

[0023] Figure 7 is the structural schematic diagram of the cam in this embodiment.

[0024] Figure 8 is the structural schematic diagram of the large drum wheel in this embodiment.

[0025] Reference numerals: 1 - large drum wheel; 101 - adsorption seat; 102 - central fixture; 103 - side clamp; 2 - bottom-opening transmission mechanism; 201 - rotating shaft; 202 - mounting seat; 212 - fixed disk; 222 - paper clip disk; 232 - mounting groove; 203 - transmission shaft; 204 - paper clip; 214 - swing arm; 224 - chuck; 234 - hook; 205 - driving wheel; 206 - cam; 216 - protruding portion; 207 - paper clamping wheel; 208 - push plate; 218 - pushing portion; 209 - suction disk; 210 - return spring; 3 - notch; 4 - adjusting plate; 5 - lead screw; 6 - frame; 7 - paper bag; 8 - upper side edge. Detailed implementation mode

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] As Figure 1-8 ; As Figure 1 shown, when folding the square bottom of the paper bag, the paper clip 204 is located on the upper side edge of the paper bag 7; This embodiment discloses a square-bottom folding device for a paper bag machine, including a bottom-opening transmission mechanism 2 and a large drum wheel 1. The large drum wheel 1 is a prior art, and its structure and working principle have been disclosed; The bottom-opening transmission mechanism 2 includes a rotating shaft 201, and mounting seats 202 are symmetrically arranged on the rotating shaft 201. A suction disk 209 is arranged between a pair of the mounting seats 202; The mounting seat 202 and the rotating shaft 201 are connected by a spline, so that the mounting seat 202 can rotate with the rotating shaft 201 and horizontally slide on the rotating shaft 201 to adjust the distance between the two mounting seats 202;

[0028] The transmission shaft 203 connecting the paper clip 204 is eccentrically arranged on the mounting seat 202. The transmission shaft 203 is rotatably connected to the mounting seat 202 and can horizontally reciprocate; A driving wheel 205 is also sleeved on the rotating shaft 201 on one side of the mounting seat 202. A cam 206 for controlling the swing of the paper clip 204 is arranged on the side of the driving wheel 205 facing the mounting seat 202. A paper clamping wheel 207 cooperating with the cam 206 is arranged on the transmission shaft 203; A return spring 210 is also arranged between the paper clip 204 and the mounting seat 202; A push plate 208 abutting against the transmission shaft 203 is also arranged on the driving wheel 205, and the push plate 208 is used to drive the transmission shaft 203 to translate towards the suction disk 209.

[0029] As Figures 3-4As shown in the figure, the mounting base 202 includes fixing plates 212 symmetrically arranged on both sides of the paper clip 204 and a paper clamping plate 222. The paper clamping plate 222 is located on the side of the paper clip 204 facing the suction disc 209. An installation groove 232 is formed between the paper clamping plate 222 and the fixing plate 212. The paper clip 204 is arranged in the installation groove 232 through a transmission shaft 203, and one end of the transmission shaft 203 penetrates the fixing plate 212 and abuts against the push plate 208. The paper clamping wheel 207 is fixed to the end of the transmission shaft 203 that abuts against the push plate 208. There are two cams 206, which are arranged circumferentially along the driving wheel 205. A convex portion 216 for controlling the paper clip 204 to swing away from the driving wheel 205 is also arranged on a pair of the cams 206. A pushing portion 218 is extended and arranged on the side of the push plate 208 facing the mounting base 202. The pushing portion 218 is located between the two convex portions 216.

[0030] When the paper bag 7 is sent below the bottom-opening transmission mechanism 2 through the conveyor belt, the upper surface of the paper bag will be adsorbed by the suction disc 209 and move upward with the rotation of the rotating shaft 201, and the side of the paper bag will move along the paper clamping plate 222. During the upward movement, as Figure 4 shown, the paper clamping wheel 207 fixedly connected to the transmission shaft 203 will abut against the cam 206. Under the action of the cam 206, the transmission shaft 203 will drive the swing arm 214 to gradually deviate in the direction away from the center of the rotating shaft 201, so that the clamping head 224 is lifted upward away from the installation groove 232. At the same time, the end of the transmission shaft 203 on the mounting base 202 will first abut against the pushing portion 218 of the push plate 208, and under the action of 218, it will gradually move horizontally in the direction of the suction disc, and drive the paper clip 204 to move in the direction of the paper clamping plate 222, so that the clamping head 224 enters the bottom fold of the paper bag. Then, after moving a certain distance, the paper clamping wheel 207 disengages from the convex portion 216 of the paper bag, and the paper clip swings downward under the action of the return spring 210, so that the clamping head 224 clamps the upper side edge 8 on the side of the paper clamping plate 222 to realize the positioning and bottom folding of the paper bag. The above structure makes the paper clip change from the original single swinging rotation to the horizontal movement and swinging downward cooperation when clamping the side of the paper bag through the push plate and the cam, thereby reducing the movement stroke of the paper clip 204 and reducing the moving space of the paper clip. At the same time, for some thicker paper bags, the horizontal movement of the paper clip 204 first enables the clamping head 224 to enter the side of the paper bag first, so as to avoid the clamping head not being able to enter between the end faces of the paper bag, making the clamping head 224 better position and bottom fold the side of the paper bag, improving the quality of the paper bag bottom folding;

[0031] At the same time, the structure is simpler. By changing the positions of the push plate 208 and the cam, the paper clip can be controlled to clamp the paper bag at different positions, which is convenient for the debugging and maintenance of the machine.

[0032] When the paper clip 204 rotates a certain distance again along with the paper bag, the paper clamping wheel 207 passes through the convex part 216 of the second cam, causing the chuck 224 to lift and release the side of the paper bag. At the same time, the end of the transmission shaft 203 also disengages from the pushing part 218, so that the transmission shaft 203 translates away from the suction disc 209 under the action of the spring. The spring is sleeved on the transmission shaft 203 and is located between the paper clamping wheel 207 and the fixed disc 212, thereby moving the paper clip away from the paper clamping disc 222 and retracting it into the installation groove 232.

[0033] The paper clip 204 includes a swing arm 214 with one end fixedly connected to the transmission shaft 203. A chuck 224 is arranged on the swing arm 214, and the chuck 224 cooperates with the paper clamping disc 222 to clamp the side of the paper bag.

[0034] In this embodiment, as Figure 1 , 8 shown, it further includes a frame 6, and the bottom-opening transmission mechanism 2 is rotatably connected to the frame 6; a large drum wheel 1 that rotates in the opposite direction to the bottom-opening transmission mechanism 2 is also arranged on the frame 6. The large drum wheel 1 is a prior art and has the same principle as the large drum wheel in the publication number (CN202020912854.8). A plurality of adsorption seats 101 are circumferentially arranged on the large drum wheel 1, a central clamp 102 is arranged in the middle of the adsorption seats 101, and a pair of side clamps 103 are arranged between the plurality of adsorption seats 101; when the paper bag is conveyed between the suction disc 209 and the large drum wheel 1, the adsorption seats 101 of the large drum wheel adsorb one side of the paper bag and drive the paper bag 8 to move in its rotating direction. At the same time, the central clamp 102 on the large drum wheel 1 will clamp one end of the bottom of the paper bag 7 during its rotation, and the side clamps 103 on both sides will clamp the lower side of the paper bag, so that in cooperation with the bottom-opening transmission mechanism 2, the paper bag forms as Figure 1 shown.

[0035] As Figure 6 shown, a hook 234 is arranged at the end of the swing arm 214 far from the transmission shaft 203. One end of the return spring 210 is connected to the hook 234, and the other end is connected to the mounting seat 202; under the action of the return spring 210, the swing arm 214 can drive the chuck 224 to swing towards the installation groove, so that the chuck can cooperate with the paper clamping disc to clamp the side of the paper bag.

[0036] In this embodiment, a notch 3 is arranged on the paper clamping disc 222; head cards are arranged at the bag mouths of some paper bags. When the paper clamping disc 222 presses on the head card of the paper bag, indentations will be generated on the surface of the paper bag, affecting the appearance of the paper bag; the arrangement of the notch 3 can enable the paper clamping disc 222 to avoid the position of the head card during the rolling process, thereby reducing the impact on the appearance of the paper bag.

[0037] In this embodiment, an adjusting plate 4 is further arranged on a pair of the driving wheels 205, and a lead screw 5 is threadedly connected between the pair of adjusting plates 4. The lead screw 5 is used to control the pair of adjusting plates 4 to move towards or away from each other. The adjusting plate 4 can control the positions between the driving wheels 205, and further control the distance between the two mounting seats 202, so as to adapt to paper bags of different widths, which facilitates adjustment and improves practicability.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention shall be included in the protection scope of the present invention.

Claims

1. A square-bottom folding device for a paper bag machine, comprising a frame (6), a large drum wheel (1), and an open-bottom transmission mechanism (2). The open-bottom transmission mechanism (2) includes a rotating shaft (201), and mounting seats (202) are symmetrically arranged on the rotating shaft (201). An air suction disc (209) is arranged between a pair of the mounting seats (202), and is characterized in that, An eccentric drive shaft (203) for connecting a paper clip (204) is provided on the mounting base (202). The drive shaft (203) is rotatably connected to the mounting base (202) and can move horizontally; a drive wheel (205) is also sleeved on the rotating shaft (201) and located on one side of the mounting base (202). A cam (206) for controlling the swing of the paper clip (204) is provided on the side of the drive wheel (205) facing the mounting base (202). A paper clamping wheel (207) cooperating with the cam (206) is provided on the drive shaft (203); a return spring (210) is further provided between the paper clip (204) and the mounting base (202); a push plate (208) abutting against the drive shaft (203) is also provided on the drive wheel (205). The push plate (208) is used to drive the drive shaft (203) to translate towards the suction cup (209). The paper clamping wheel (207) is slidably connected to the mounting base (202) and can be elastically reset; The paper clip (204) includes a swing arm (214) fixedly connected to the drive shaft (203) at one end. A clamping head (224) is provided on the swing arm (214). The clamping head (224) cooperates with a paper clamping disc (222) to clamp the side edge of a paper bag; Under the action of the cam (206), the drive shaft (203) will drive the swing arm (214) to deviate gradually in a direction away from the center of the rotating shaft (201), so that the clamping head (224) is lifted upwards. At the same time, the end of the drive shaft (203) on the mounting base (202) will first abut against the push plate (208) and gradually move horizontally towards the suction cup, driving the clamping head of the paper clip (204) into the bottom fold of the paper bag. Then, after moving a certain distance, the paper clip swings downwards under the action of the return spring (210) so that the clamping head (224) clamps the upper side edge to the side of the paper clamping disc (222) to realize the positioning and bottom folding of the paper bag.

2. The square-bottom folding device of a paper bag machine according to claim 1, characterized in that, The mounting base (202) includes fixed discs (212) symmetrically arranged on both sides of the paper clip (204) and a paper clamping disc (222). The paper clamping disc (222) is located on the side of the paper clip (204) facing the suction cup (209); an installation groove (232) is formed between the paper clamping disc (222) and the fixed disc (212). The paper clip (204) is arranged in the installation groove (232) through the drive shaft (203), and one end of the drive shaft (203) penetrates through the fixed disc (212) to abut against the push plate (208). The paper clamping wheel (207) is fixed to the end of the drive shaft (203) abutting against the push plate (208).

3. The square-bottom folding device of a paper bag machine according to claim 1, characterized in that, A hook (234) is provided at the end of the swing arm (214) far from the drive shaft (203). One end of the return spring (210) is connected to the hook (234), and the other end is connected to the mounting base (202).

4. The square-bottom folding device of a paper bag machine according to claim 2, characterized in that, A notch (3) is provided on the paper clamping disc (222).

5. A square-bottom folding device for a paper bag machine according to claim 1, characterized in that, An adjusting plate (4) is further provided on a pair of the drive wheels (205). A lead screw (5) is threadedly connected between the pair of adjusting plates (4). The lead screw (5) is used to control the mounting base (202) to move towards or away from each other.

6. The square-bottom folding device of a paper bag machine according to claim 1, characterized in that, The cam (206) is provided with two and arranged circumferentially along the driving wheel (205); a pair of the cams (206) is further provided with a convex portion (216) for controlling the swinging of the paper clip (204) away from the driving wheel (205).

7. The square-bottom folding device of a paper bag machine according to claim 6, characterized in that, One side of the push plate (208) facing the mounting seat (202) is extended with a pushing portion (218), and the pushing portion (218) is located between two convex portions (216).

8. The square-bottom folding device of a paper bag machine according to claim 1, characterized in that, The large drum wheel (1) rotates in the opposite direction to the open-bottom transmission mechanism (2). A plurality of adsorption seats (101) are arranged circumferentially on the large drum wheel (1). A central fixture (102) is arranged in the middle of the adsorption seats (101). A pair of side clamps (103) are arranged between the plurality of adsorption seats (101).

Images