Gusseted bag forming machine and method of making gusseted bags

Abstract

The application discloses a square bottom bag forming machine and a method for manufacturing square bottom bags, and comprises a base, an adjusting frame arranged on the base, two heat sealing blocks capable of being closed and arranged on the adjusting frame in a front-rear symmetry mode, two cooling blocks capable of being closed and arranged on the adjusting frame above the heat sealing blocks in a front-rear symmetry mode, two clamping plates capable of being closed and passively lifted and arranged on the adjusting frame below the heat sealing blocks in a front-rear symmetry mode, a cutter capable of moving forward and backward and left and right and arranged between the heat sealing blocks and the cooling blocks on any one side, the cutter being located below the cooling blocks and above the heat sealing blocks, a sliding frame arranged on the base and capable of sliding left and right, a lifting plate arranged on the sliding frame and capable of lifting, a positioner arranged on the lifting plate and capable of positioning bags, and a bag expander arranged on the lifting plate and capable of expanding bags. The application has the advantages of simple structure, convenient operation, and guaranteed forming efficiency and quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bag making, in particular to a square bottom bag forming machine and a method for making square bottom bags. BACKGROUND

[0002] The square bottom bag is a bag with a square bottom and a three-dimensional structure, which can package three-dimensional goods or square products. Currently, there are several methods for making square bottom bags on the market, including heat sealing forming method, cold pressing forming method, ultrasonic welding method and manual bag making method. The manual bag making method requires manual placement of pre-cut pieces into the mold, followed by manual heat sealing and side stitching, which is low in efficiency. The heat sealing forming method, cold pressing forming method and ultrasonic welding method are all automatic production, which is fast in efficiency. However, the equipment used in the heat sealing forming method, cold pressing forming method and ultrasonic welding method on the market has a complex structure, high purchase cost and high maintenance cost in the later period. Especially when making square bottom bags of different sizes, the corresponding parts need to be replaced in sets, which greatly increases the production cost. SUMMARY

[0003] The purpose of the present application is to provide a square bottom bag forming machine with simple structure, convenient operation and high production efficiency, and a method for making square bottom bags.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a square bottom bag forming machine, comprising: a base, an adjusting frame is arranged on the base, two heat sealing blocks capable of being closed are symmetrically arranged on the adjusting frame, two cooling blocks capable of being closed are symmetrically arranged on the adjusting frame above the heat sealing blocks, two clamping plates capable of being closed and passively lifted are symmetrically arranged on the adjusting frame below the heat sealing blocks, a cutting knife capable of moving forward and backward and left and right is arranged between the heat sealing blocks and the cooling blocks on either side, the cutting knife is located below the cooling blocks and above the heat sealing blocks, a sliding frame is slidably arranged on the base, a lifting plate is liftably arranged on the sliding frame, a positioner capable of positioning the bag and a bag opener capable of opening the bag are arranged on the lifting plate.

[0005] Further, the aforementioned square bottom bag forming machine, wherein the positioner comprises: an adjusting plate arranged on the lifting plate, an L-shaped plate movably arranged on the adjusting plate, a plurality of groups of first connecting holes arranged on the adjusting plate from top to bottom, a group of second connecting holes arranged on the vertical wall of the L-shaped plate, a group of second connecting holes aligned with any group of first connecting holes, and a bolt threaded between the aligned first connecting hole and the second connecting hole, a fixed air cylinder arranged on the left and right sides of the horizontal wall of the L-shaped plate, the piston rods of the two fixed air cylinders facing the vertical wall of the L-shaped plate, and a rubber pad arranged on the piston rod.

[0006] Further, the aforementioned square-bottom bag forming machine, wherein the bag supporting device comprises a fixed supporting plate fixed on the lifting plate and a left and right slidingly arranged movable supporting plate on the lifting plate, the fixed supporting plate and the movable supporting plate are respectively located on the left and right sides of the positioner, two first guide rails are arranged on the lifting plate in the left and right directions, the adjusting plate is slidingly clamped on the two first guide rails and is fixed on the first guide rails by means of the set screws, two sliding plates are slidingly clamped on the first guide rails, the fixed supporting plate and the movable supporting plate are respectively fixed on the two sliding plates, the set screws are arranged on the sliding plate connected with the fixed supporting plate and are fixed on the first guide rails, the sliding plate connected with the movable supporting plate is connected with the piston rod of the push-pull cylinder, the push-pull cylinder is fixed on the lifting plate, the sensing plate is arranged on the sliding plate connected with the movable supporting plate, the sensing switch capable of sensing the sensing plate and capable of adjusting the position in the left and right directions is arranged on the lifting plate, the thickness of the fixed supporting plate and the movable supporting plate is 2-3 mm, and the round corners are arranged between the bottom wall and the outer wall of the fixed supporting plate and the movable supporting plate.

[0007] Further, the aforementioned square-bottom bag forming machine, wherein the connecting structure between the lifting plate and the sliding frame is that the supporting platform is arranged on the sliding frame, the mounting platform is arranged on the supporting platform, four screw rods are arranged around the supporting platform, the first nuts are threadedly connected on the screw rods located on the upper and lower sides of the supporting platform, the two first nuts are screwed against the supporting platform, the mounting platform is sleeved on the four screw rods, the second nuts are threadedly connected on the screw rods located on the upper and lower sides of the mounting platform, the two second nuts are screwed against the mounting platform, the two lifting cylinders are vertically arranged on the mounting platform, the synchronization plate is connected between the piston rods of the two lifting cylinders, and the connecting plate is arranged on the lifting plate and connected with the synchronization plate.

[0008] Further, the aforementioned square-bottom bag forming machine, wherein the connecting structure between the sliding frame and the base is that the two second guide rails and the first rodless cylinder parallel to the second guide rails are arranged on the base, the sliding frame is slidingly clamped on the two second guide rails, the first connecting block is arranged on the sliding frame, the second connecting block is arranged on the sliding table of the first rodless cylinder, and the first connecting block is connected with the second connecting block.

[0009] Further, the aforementioned square-bottom bag forming machine, wherein two connecting profiles are symmetrically arranged on the adjusting frame, two cooling cylinders are symmetrically arranged on the upper side wall of each connecting profile, a cooling block is connected with the two cooling cylinders on the same side, a cooling hole is arranged in the cooling block and penetrates the left and right end walls of the cooling block, two heat sealing cylinders are symmetrically arranged on the lower side wall of each connecting profile, a heat sealing block is connected with the two heat sealing cylinders on the same side, two cutter cylinders are symmetrically arranged on the upper side wall of each connecting profile, a cutter frame is connected between the two cutter cylinders, two sliding holes are arranged in the cutter frame, the piston rods of the two cooling cylinders arranged on the same connecting profile are slid through the corresponding sliding holes and are connected with the cooling block, a second rodless cylinder is arranged on the cutter frame, and a cutter is arranged on the sliding table of the second rodless cylinder.

[0010] Further, the aforementioned square-bottom bag forming machine, wherein a longitudinal connecting plate is arranged downward on the bottom wall of each connecting profile, a transverse connecting plate is connected with the longitudinal connecting plate, two clamping plate cylinders are symmetrically arranged on the transverse connecting plate, a piston fixing block is arranged on the piston rod of the clamping plate cylinder, a sliding groove is arranged in the piston fixing block, a movable plate is movably arranged in the sliding groove, a return spring is arranged between the movable plate and the sliding groove, the upper end of the return spring is connected with the movable plate, the lower end of the return spring is connected with the sliding groove, two clamping plates are connected with the two movable plates on the same side, and anti-skid rubber blocks are arranged on the opposite side walls of the two clamping plates.

[0011] Further, the aforementioned square-bottom bag forming machine, wherein a boss is arranged on the movable plate, universal ball bearings are arranged on the front and rear side walls of the boss, the universal ball bearings abut against the front and rear side walls of the sliding groove, the left and right side walls of the boss abut against the left and right side walls of the sliding groove, and a limiting cover plate is arranged on the piston fixing block and sleeved with the movable plate.

[0012] Further, the aforementioned square-bottom bag forming machine, wherein two one-way cylinders are arranged on the two transverse connecting plates, the one-way cylinders on the two transverse connecting plates are aligned in front and back, an auxiliary top plate is arranged between the piston rods of the two one-way cylinders aligned in front and back, the auxiliary top plate is located below the two clamping plates, and a space is left between the auxiliary top plate and the clamping plates.

[0013] A method for making a square-bottom bag using the aforementioned square-bottom bag forming machine, and the steps are as follows:

[0014] S1, folding the bag, folding the square bag with three edges heat sealed and one edge open along the longitudinal center lines of the two opposite symmetric bag surfaces to make the square bag into a bag with two triangular bottoms;

[0015] S2, fixing the folded bag on the bag stretcher and the positioner;

[0016] S3, the sliding frame moves the fixed bag to the adjusting frame, two heat sealing blocks are closed and abut on the triangular bottom of the bag to heat seal the two triangular bottoms and form heat sealing indentations, meanwhile, the clamping plates are closed to clamp the triangular bottom of the bag;

[0017] S4, after the heat sealing is completed, the two heat sealing blocks are opened, the lifting plate drives the bag to ascend, the clamping plates are passively ascended to straighten the bag, when the heat sealing indentations on the triangular bottom are located between the two cooling blocks, the two cooling blocks are closed and abut on the heat sealing indentations to cool, in the cooling process, the cutter cuts the triangular bottom, the clamping plates are automatically reset and then opened;

[0018] S5, after the cooling is completed, the two cooling blocks are opened, the sliding frame moves the bag out of the adjusting frame, the bag stretcher and the positioner are loosened, the bag is taken down, and the bag is opened to form a square bottom bag.

[0019] The advantage of the present application is that the structure is simple, the operation is convenient, the forming efficiency and quality can be ensured, the square bag is only folded along the longitudinal center lines of the two symmetrical bag surfaces in advance to form two triangular bottoms on the bag, then the bag is sleeved on the bag stretcher and fixed by the positioner, then the two triangular bottoms are heat sealed by the heat sealing blocks, then the heat sealing portions are cooled by the cooling blocks, while cooling, the triangular bottom is cut by the cutter to remove the excess part, after the cooling is completed, the bag is taken down, and the bag is opened to form a square bottom bag; when square bottom bags of different sizes are made, only the distance between the fixed support plate and the movable support plate and the height of the L-shaped plate need to be adjusted to support bags of different sizes, without replacing parts, the present application has high flexibility and adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic view of a square bag with one side open and three sides heat sealed.

[0021] Figure 2 is Figure 1 a structure schematic view of the square bag shown in FIG. 1 after folding.

[0022] Figure 3 is Figure 2 a structure schematic view of the bag shown in FIG. 2 after heat sealing and cutting.

[0023] Figure 4 is Figure 3 a structure schematic view of the square bottom bag formed after the bag shown in FIG. 3 is opened.

[0024] Figure 5 is a structure schematic view of the square bottom bag forming machine described in the present application.

[0025] Figure 6 is Figure 5 a structure schematic view of the installation of the cooling blocks in FIG. 6.

[0026] Figure 7 is Figure 5 The installation structure schematic diagram of the heat sealing block.

[0027] Figure 8 is Figure 5 The installation structure schematic diagram of the cutter holder.

[0028] Figure 9 is Figure 5 The installation structure schematic diagram of the clamping plate.

[0029] Figure 10 is Figure 9 The connection structure schematic diagram between the movable plate and the piston fixed block.

[0030] Figure 11 is Figure 9 The connection structure schematic diagram between the movable plate and the piston fixed block in another view direction.

[0031] Figure 12 is Figure 2 The connection structure schematic diagram between the bag and the square bottom bag forming machine. DETAILED DESCRIPTION

[0032] The technical solutions described in the present application will be further described in combination with the drawings and preferred embodiments.

[0033] As Figures 5 to 12As shown, the square bottom bag forming machine comprises a base 1, an adjusting frame 11 is arranged on the base 1, two connecting profiles 2 are symmetrically arranged on the adjusting frame 11, two cooling cylinders 21 are symmetrically arranged on the upper side wall of each connecting profile 2, a cooling block 3 is connected between the two cooling cylinders 21 on the same side, the two cooling blocks 3 on the front and back sides can be closed under the drive of the corresponding cooling cylinders 21, a cooling hole 31 is arranged in the cooling block 3 and penetrates the left and right end walls of the cooling block 3, the two ends of the cooling hole 31 are connected with the liquid inlet pipe and the liquid outlet pipe respectively, the cooling liquid is introduced into the cooling hole 31 through the liquid inlet pipe, and then the cooling liquid is discharged through the liquid outlet pipe, so that the cooling block 3 always maintains low temperature, two heat sealing cylinders 22 are symmetrically arranged on the lower side wall of each connecting profile 2, a heat sealing block 4 is connected between the two heat sealing cylinders 22 on the same side, the two heat sealing blocks 4 on the front and back sides can be closed under the drive of the corresponding heat sealing cylinders 22, two cutter cylinders 23 are symmetrically arranged on the upper side wall of each connecting profile 2, a cutter frame 51 is connected between the two cutter cylinders 23, two sliding holes are arranged in the cutter frame 51, the piston rods of the two cooling cylinders 21 arranged on the same connecting profile 2 as the cutter cylinder 23 slide through the corresponding sliding holes and are connected with the cooling block 3, a second rodless cylinder 52 is arranged on the cutter frame 51, a cutter 5 is arranged on the sliding table of the second rodless cylinder 52, and the cutter 5 is located below the cooling block 3 and above the heat sealing block 4.

[0034] The bottom wall of the two connecting profiles 2 is provided with a longitudinal connecting plate 24 downwardly, the longitudinal connecting plate 24 is connected with a horizontal connecting plate 25, a reinforcing angle code is arranged between the longitudinal connecting plate 24 and the horizontal connecting plate 25 to improve the connecting strength therebetween, two clamping plate air cylinders 61 are arranged on the horizontal connecting plate 25 in left-right symmetry, a piston fixing block 62 is arranged on the piston rod of the clamping plate air cylinder 61, a sliding groove 621 is formed in the piston fixing block 62, a movable plate 63 is movably arranged in the sliding groove 621, a return spring 64 is arranged between the movable plate 63 and the sliding groove 621, the upper end of the return spring 64 is connected with the movable plate 63, the lower end of the return spring 64 is connected with the sliding groove 621, a clamping plate 6 is connected between the two movable plates 63 on the same side, anti-skid rubber blocks 65 are arranged on the opposite side walls of the two clamping plates 6, a boss 631 is arranged on the movable plate 63, universal ball bearings 632 are arranged on the front and rear side walls of the boss 631, the universal ball bearings 632 abut against the front and rear side walls of the sliding groove 621, the left and right side walls of the boss 631 abut against the left and right side walls of the sliding groove 621, a limiting cover plate 622 is arranged on the piston fixing block 62 and sleeved on the movable plate 63, the limiting cover plate 622 limits the boss 631 on the movable plate 63, two one-way air cylinders 66 are arranged on each of the two horizontal connecting plates 25, the one-way air cylinders 66 on the two horizontal connecting plates 25 are aligned in front and back, an auxiliary top plate 67 is arranged between the piston rods of the two one-way air cylinders 66 aligned in front and back, the auxiliary top plate 67 is located below the two clamping plates 6, and a space is left between the auxiliary top plate 67 and the clamping plates 6.

[0035] A sliding frame 12 is arranged on the base 1 to slide left and right, a lifting plate 13 is arranged on the sliding frame 12 to lift up and down, a positioner 7 capable of positioning a bag and a bag expander 8 capable of expanding a bag are arranged on the lifting plate 13.

[0036] The method for manufacturing a square bottom bag by using the square bottom bag forming machine comprises the following steps:

[0037] S1, fold the bag, the bag in the embodiment is a square bag with three edges heat-sealed and one edge open, as shown in the drawing, then fold along the longitudinal center lines of the two opposite bag surfaces to form a structure as shown in the drawing: two triangular bottoms are formed downwardly on the bag bottom of the bag; Figure 1 Figure 2 S2, then fix the bag by the positioner 7, expand the bag by the bag expander 8, and keep the bag in a flat state;

[0038] S2, then fix the bag by the positioner 7, expand the bag by the bag expander 8, and keep the bag in a flat state;

[0039] ​S3, then the sliding frame 12 slides to the adjusting frame 11 direction, the bag opened by the bag opener 8 is sent into between the two connecting profiles 2, the front and rear alignment two heat sealing blocks 4 are closed and abut on the two triangular bottoms of the bag under the drive of the corresponding side heat sealing cylinder 22, the heat sealing block 4 heat seals the triangular bottom on the same side, and a heat sealing indentation is formed on the two triangular bottoms, because the bag is a composite structure, the outer layer uses the material that is not easy to adhere under high temperature, such as PET, and the inner layer uses the material that is easy to adhere under high temperature, such as PE, so when heat sealing, the easy-to-adhere material of the inner layer of the triangular bottom will adhere together under high temperature, so that the triangular bottom is sealed at the heat sealing indentation, and the outer layer of the two triangular bottoms will not adhere under high temperature, so the two triangular bottoms will not adhere during heat sealing. In the heat sealing process, the front and rear alignment two clamping plates 6 are closed and clamped on the two triangular bottoms of the bag under the drive of the corresponding side clamping plate cylinder 61, and the anti-skid rubber block 65 on the clamping plate 6 can prevent the bag from slipping between the clamping plates 6;

[0040] S4, after heat sealing, two heat sealing blocks 4 open, the lifting plate 13 rises, the bag also rises together, the bag drives the clamping plate 6 and the movable plate 63 to rise against the elastic force of the reset spring 64, the bag is kept straight by the elastic force of the reset spring 64, when the two clamping plates 6 are closed, the front and rear walls of the movable plate 63 and the front and rear walls of the sliding groove 621 increase the friction force due to stress, the universal ball bearing 632 is arranged on the front and rear side walls of the boss 631 of the movable plate 63 to eliminate the defect, and the sliding friction is changed into rolling friction, so that the movable plate 63 can move more smoothly in the sliding groove 621, if the bag is thin and easy to be torn, the one-way cylinder 66 needs to be started synchronously when the bag rises, the one-way cylinder 66 drives the auxiliary top plate 67 to push the clamping plate 6 upward, reduces the pulling force on the bag, prevents the bag from being torn, and the auxiliary top plate 67 and the clamping plate 6 have a gap, the rising speed of the piston rod in the one-way cylinder 66 is consistent with the rising speed of the lifting plate 13, the lifting plate 13 and the one-way cylinder 66 rise synchronously, the lifting plate 13 drives the bag to rise, and since there is a gap between the auxiliary top plate 67 and the clamping plate 6, the bag is first straightened under the action of the reset spring 64 and the pulling force of the lifting plate 13, then the auxiliary top plate 67 abuts against the clamping plate 6 to drive the clamping plate 6 to continue to rise, the bag is only subjected to the initial pulling force, so the bag is not easy to be torn, when the heat sealing indentation on the triangular bottom is located between the two cooling blocks 3, the front and rear aligned two cooling blocks 3 are closed under the drive of the cooling cylinders 21 on the corresponding sides to abut against the heat sealing indentation to cool the heat sealing indentation, at the same time, the one-way cylinder 66 resets and no longer pushes the clamping plate 6, the clamping plate 6 is straightened under the action of the reset spring 64 to cooperate with the cooling block 3 to straighten the triangular bottom of the bag, at this time, the cutter 5 is located below the heat sealing indentation, then the cutter cylinder 23 drives the cutter frame 51 to move towards the bag, then the second rodless cylinder 52 drives the cutter 5 to move transversely, so that the cutter 5 can cut the triangular bottom of the bag to form a structure as shown in Figure 3 , after the bag is cut, the clamping plate 6 is automatically reset downward under the action of the reset spring 64, and the two clamping plates 6 are opened to throw away the cut waste;

[0041] S5, after cooling, the two cooling blocks 3 are opened, the sliding frame 12 slides away from the adjusting frame 11, the positioner 7 and the bag holder 8 loosen the bag, and the bag is opened after being taken down to form a square bottom bag as shown in Figure 4 .

[0042] The connecting structure between the sliding frame 12 and the base 1 in the embodiment is that two second guide rails 14 and a first rodless air cylinder 15 parallel to the second guide rails 14 are arranged on the base 1, the sliding frame 12 is slidably clamped on the two second guide rails 14, a first connecting block 121 is arranged on the sliding frame 12, a second connecting block 151 is arranged on the sliding table of the first rodless air cylinder 15, the first connecting block 121 is connected with the second connecting block 151, the lifting plate 13 is arranged on the sliding frame 12 in a lifting mode, and the connecting structure between the lifting plate 13 and the sliding frame 12 is that a support platform 122 is arranged on the sliding frame 12, a mounting platform 123 is arranged on the support platform 122, four screw rods 124 are arranged around the support platform 122, first nuts are threadedly connected on the screw rods 124 located on the upper and lower sides of the support platform 122, the two first nuts are screwed against the support platform 122, the four screw rods 124 are fixed on the support platform 122, the mounting platform 123 is sleeved on the four screw rods 124, second nuts are threadedly connected on the screw rods 124 located on the upper and lower sides of the mounting platform 123, the two second nuts are screwed against the mounting platform 123, the mounting platform 123 is fixed between the four screw rods 124, two lifting air cylinders 125 are vertically arranged on the mounting platform 123, a synchronization plate 126 is connected between the piston rods of the two lifting air cylinders 125, a connecting plate is arranged on the lifting plate 13, the synchronization plate 126 is connected with the connecting plate, two first guide rails 131 in the left-right direction are arranged on the lifting plate 13, the positioner 7 and the bag supporter 8 are arranged on the lifting plate 13, the positioner 7 comprises an adjusting plate 71, the adjusting plate 71 is slidably clamped on the two first guide rails 131 and is fixed on the two first guide rails 131 through a set screw, an L-shaped plate 72 is movably arranged on the adjusting plate 71, a plurality of groups of first connecting holes 711 are arranged on the adjusting plate 71 in a spaced mode from top to bottom, a group of second connecting holes are arranged on the vertical wall of the L-shaped plate 72, the group of second connecting holes is aligned with any group of first connecting holes 711, a bolt is arranged between the aligned first connecting hole 711 and the second connecting hole, and a fixing air cylinder 721 is arranged on the left and right sides of the horizontal wall of the L-shaped plate 72, the piston rods of the two fixing air cylinders 721 are directed to the vertical wall of the L-shaped plate 72, and a rubber pad is arranged on the piston rod, the bag supporter 8 comprises a fixed support plate 81 fixed on the lifting plate 13 and a movable support plate 82 slidably arranged on the lifting plate 13 in the left-right direction, the fixed support plate 81 and the movable support plate 82 are respectively located on the left and right sides of the positioner 7, two sliding plates 132 are slidably clamped on the first guide rails 131, the fixed support plate 81 and the movable support plate 82 are respectively fixed on the two sliding plates 132, a set screw is arranged on the sliding plate 132 connected with the fixed support plate 81, the set screw is fixed on the two first guide rails 131, the fixed support plate 81 is fixed, the sliding plate 132 connected with the movable support plate 82 is connected with the piston rod of a push-pull air cylinder 133, and the push-pull air cylinder 133 is fixed on the lifting plate 13.A sensor plate 83 is installed on the slide plate 132 connected to the movable support plate 82, and a sensor switch 134 is installed on the lifting plate 13 that can sense the sensor plate 83 and can be adjusted left and right. When packing bags, first... Figure 1 The square bag shown is first folded into the shape shown. Figure 2 The structure shown has a triangular base, and then... Figure 2 The bag shown is fitted onto a fixed support plate 81 and a movable support plate 82. The top opening of the bag rests against an L-shaped plate 72 for height positioning. A push-pull cylinder 133 drives the movable support plate 82 to move away from the fixed support plate 81. When the sensing plate 83 is sensed by the sensing switch 134, the movable support plate 82, together with the fixed support plate 81, supports the sides of the bag. After the bag expander 8 opens the bag, the piston rod of the fixed cylinder 721 presses against the bag to fix it in place. The rubber pad on the piston rod prevents damage to the bag. Different sizes of bags have different widths and heights after folding. Adjusting the vertical position of the L-shaped plate 72 on the adjusting plate 71 can accommodate bags of different heights, while adjusting the horizontal position of the sensing switch 134 can adjust the maximum distance between the movable support plate 82 and the fixed support plate 81 to accommodate bags of different widths.

[0043] In this embodiment, the thickness of the fixed support plate 81 and the movable support plate 82 is 2-3mm, so that the stretched bag is in a flat state. Rounded corners are provided between the bottom wall and the outer wall of the fixed support plate 81 and the movable support plate 82 to prevent the bag from being punctured.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A square bottom bag forming machine, including: The base is characterized by: an adjusting frame on the base; two heat-sealing blocks symmetrically arranged front-to-back on the adjusting frame; two cooling blocks symmetrically arranged front-to-back on the adjusting frame above the heat-sealing blocks; and two clamping plates symmetrically arranged front-to-back and passively lifting on the adjusting frame below the heat-sealing blocks. A cutter capable of moving back-to-back and left-to-right is arranged between the heat-sealing block and the cooling block on either side, the cutter being located below the cooling block and above the heat-sealing block. Two connecting profiles symmetrically arranged front-to-back on the adjusting frame, and two cooling cylinders symmetrically arranged left-to-right on the upper sidewalls of each connecting profile, and cooling blocks... Connected to two cooling cylinders on the same side, the cooling block has cooling holes penetrating its left and right end walls. Two heat-sealing cylinders are symmetrically arranged on the lower side walls of both connecting profiles. The heat-sealing block is connected to the two heat-sealing cylinders on the same side. Two cutting cylinders are symmetrically arranged on the upper side wall of any connecting profile. A cutting tool holder connects the two cutting cylinders, and two sliding holes are provided on the cutting tool holder. The piston rods of the two cooling cylinders, which are located on the same connecting profile as the cutting cylinders, slide through the corresponding sliding holes and connect to the cooling block. A second rodless cylinder is mounted on the cutting tool holder, and the cutting tool is mounted on the second rodless cylinder. On the sliding platform, longitudinal connecting plates are installed downwards on the bottom walls of both connecting profiles. Transverse connecting plates are connected to the longitudinal connecting plates. Two clamping cylinders are symmetrically arranged on the transverse connecting plates. A piston fixing block is installed on the piston rod of each clamping cylinder. A sliding groove is opened in the piston fixing block, and a movable plate is movably installed in the sliding groove. A return spring is installed between the movable plate and the sliding groove. The upper end of the return spring is connected to the movable plate, and the lower end of the return spring is connected to the sliding groove. The clamping plate is connected to the two movable plates on the same front and rear sides. Anti-slip rubber blocks are installed on the opposite side walls of the two clamping plates. A boss is installed on the movable plate, and universal ball bearings are installed on the front and rear side walls of the boss. The universal ball bearing abuts against the front and rear side walls of the slide groove, and the left and right side walls of the boss abut against the left and right side walls of the slide groove. A limiting cover plate fitted onto the movable plate is provided on the piston fixing block. Two one-way cylinders are provided on the two horizontal connecting plates, and the one-way cylinders on the two horizontal connecting plates are aligned one to the other. An auxiliary top plate is provided between the piston rods of the two one-way cylinders that are aligned one to the other. The auxiliary top plate is located below the two clamping plates, and there is a gap between the auxiliary top plate and the clamping plates. A sliding frame is slidably provided on the base, and a lifting plate is raised and lowered on the sliding frame. A positioner that can position the bag and a bag opener that can open the bag are provided on the lifting plate.

2. The square bottom bag forming machine according to claim 1, characterized in that: The positioner includes: an adjusting plate mounted on a lifting plate; an L-shaped plate movably mounted on the adjusting plate; several sets of first connecting holes spaced apart from top to bottom on the adjusting plate; a set of second connecting holes on the vertical wall of the L-shaped plate; a set of second connecting holes aligned with any set of first connecting holes; bolts passing through the aligned first and second connecting holes; and fixed cylinders mounted on the left and right sides of the horizontal wall of the L-shaped plate, with the piston rods of the two fixed cylinders facing the vertical wall of the L-shaped plate, and rubber pads mounted on the piston rods.

3. The square bottom bag forming machine according to claim 2, characterized in that: The bag-holding device includes: a fixed support plate fixed to a lifting plate and a movable support plate slidably mounted on the lifting plate. The fixed support plate and the movable support plate are located on the left and right sides of the locator, respectively. Two left-right first guide rails are provided on the lifting plate. An adjusting plate is slidably mounted on the two first guide rails and fixed to the first guide rails by a set bolt. Two sliding plates are slidably mounted on the first guide rails. The fixed support plate and the movable support plate are respectively fixed on the two sliding plates. A set bolt is provided on the sliding plate connected to the fixed support plate and fixed to the first guide rail. The sliding plate connected to the movable support plate is connected to the piston rod of a push-pull cylinder. The push-pull cylinder is fixed on the lifting plate. A sensing plate is provided on the sliding plate connected to the movable support plate. A sensor switch capable of sensing the sensing plate and adjusting its position left and right is provided on the lifting plate. The thickness of the fixed support plate and the movable support plate is 2-3 mm. Rounded corners are provided between the bottom wall and the outer wall of the fixed support plate and the movable support plate.

4. The square bottom bag forming machine according to claim 3, characterized in that: The connection structure between the lifting plate and the sliding frame is as follows: a support platform is set on the sliding frame, an installation platform is set on the support platform, four screws are threaded around the support platform, and first nuts are threaded onto the screws located on the upper and lower sides of the support platform. Both first nuts are screwed and abut against the support platform. The installation platform is fitted onto the four screws, and second nuts are threaded onto the screws located on the upper and lower sides of the installation platform. Both second nuts are screwed and abut against the installation platform. Two lifting cylinders are vertically set on the installation platform, and a synchronization plate is connected between the piston rods of the two lifting cylinders. A connecting plate is set on the lifting plate, and the synchronization plate is connected to the connecting plate.

5. The square bottom bag forming machine according to claim 4, characterized in that: The connection structure between the sliding frame and the base is as follows: two second guide rails and a first rodless cylinder parallel to the second guide rails are provided on the base. The sliding frame is slidably locked on the two second guide rails. A first connecting block is provided on the sliding frame. A second connecting block is provided on the slide table of the first rodless cylinder. The first connecting block is connected to the second connecting block.

6. A method for producing square bottom bags using the square bottom bag forming machine according to any one of claims 1 to 5, characterized in that: The steps are as follows: S1. Fold the bag: Fold the square bag with three sides heat-sealed and one side open along the longitudinal center line of the two symmetrical bag sides to make the square bag into a bag with two triangular bottoms. S2. Secure the folded bag to the bag stretcher and positioner; S3. The sliding frame moves the fixed bag to the adjusting frame. The two heat sealing blocks are aligned and pressed against the triangular base of the bag to heat seal the two triangular bases and form heat sealing indentations. At the same time, the clamping plates are aligned and clamp the triangular base of the bag. S4. After heat sealing is completed, the two heat sealing blocks open, the lifting plate lifts the bag, the clamping plate rises passively, and straightens the bag. When the heat sealing indentation on the triangular base is between the two cooling blocks, the two cooling blocks come together and press against the heat sealing indentation for cooling. During the cooling process, the cutter cuts the triangular base, the clamping plate automatically resets and then opens. S5. After cooling is complete, the two cooling blocks open, the sliding frame moves the bag out of the adjusting frame, the bag stretcher and positioner release the bag, remove the bag, and the bag is opened to form a square bottom bag.

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