CN216373550U - Plastic bag folding device capable of processing products with different sizes - Google Patents

Abstract

A plastic bag folding device capable of processing products of different sizes comprises a front corner folding mechanism, a front folding plate and a rear folding plate, wherein two guide plates arranged in parallel are arranged below the front folding plate and the rear folding plate, and two side pressing plates with opposite openings are respectively arranged above two ends of each guide plate. Each side pressing plate consists of two half-part two-side pressing plates, and the two half-part two-side pressing plates, the front folded plate and the rear folded plate are connected with a length adjusting mechanism for adjusting the front-rear distance between each pair of half-part two-side pressing plates and the front-rear distance between the front folded plate and the rear folded plate; the distance between the pressure plates on the two sides of the left half part and the right half part which are opposite is adjusted by a width adjusting mechanism. The utility model has the advantages that: the space between the two opposite side pressing plates can be respectively adjusted according to the width and the length of the plastic bag, and the space between the front folding plate and the rear folding plate can be adjusted, so that products with different widths and lengths can be processed, the applicability of the machine is improved, and the trouble of replacing parts is eliminated.

Description

Plastic bag folding device capable of processing products with different sizes

Technical Field

The utility model relates to a component of a plastic bag making machine, in particular to a folding device of a bag making machine, which can fold plastic bags with different widths and lengths.

Background

The folding device of the material bag making machine of the prior art has a main structure (a "high speed bag making machine" notice number: CN210759499U, see fig. 1 and 2) comprising: a front angle folding mechanism 2 for folding the two lifting belts at the front end of the vest-shaped plastic bag finished product towards the middle; a front folding plate 8 for folding the front part of the finished plastic bag backwards, wherein a bag pressing hook 6 capable of swinging upwards and backwards is arranged in the middle of the front end of the front folding plate 8; a rear flap 17 for folding the rear portion of the plastic bag product forward; the front corner folding mechanism 2 is arranged in front of the front folding plate 8, and a rear folding plate 17 is arranged behind the front folding plate 8; two guide plates 3 arranged in parallel are arranged below the space between the front folding plate 8 and the rear folding plate 17, and two side pressing plates 16 which are provided with opposite openings and can move up and down and relatively are respectively arranged above the two ends of the guide plates 3; an n-shaped bracket 5 connected with the frames on two sides is arranged above the guide plate 3, an inserting plate 11 is arranged below the n-shaped bracket 5, a front creasing plate 10 and a rear creasing plate 12 are respectively arranged in front of and behind the inserting plate 11, and the inserting plate 11, the front creasing plate 10 and the rear creasing plate 12 are respectively connected with a guide rod through driving cylinders 13-15 arranged on the shaped bracket. An intermediate pressure plate 18 is arranged above the rear part of the frame 1, and the rear part of the intermediate pressure plate 18 is connected with an intermediate pressure plate driving device 19 capable of driving the intermediate pressure plate to deflect and move back and forth.

Although the above prior art proposes that the widths of the front corner folding mechanism 2 and the middle platen 18 can be adjusted according to the product width by using the middle platen width adjusting device 35 and the front corner folding mechanism width adjusting device 36, thereby improving the applicability of the machine to a certain extent, since the distance between both ends of the front and rear flaps (in the extended state) is fixed, the width of the both side platens (proportional to the length of the plastic bag to be processed) is fixed, and the distance between the opposite pair of both side platens (corresponding to the width of the plastic bag to be processed) is also fixed in the above prior art. Therefore, the prior art can only be suitable for folding plastic bags with certain width and length, if the width and the length of the plastic bag are greatly different, the two side pressing plates with proper width need to be replaced, the distance between the two opposite side pressing plates needs to be adjusted, and the distance between the front folded plate and the rear folded plate needs to be adjusted, so that the work load is large, time and labor are consumed, and the operation is very troublesome.

Disclosure of Invention

The utility model aims to provide a plastic bag folding device capable of processing products with different sizes so as to solve the problem of poor applicability in the prior art.

The technical scheme of the utility model is as follows: a plastic bag folding device capable of processing products with different sizes comprises a front angle folding mechanism, a front folding plate and a rear folding plate, wherein the front angle folding mechanism is used for folding two lifting belts at the front end of a vest-shaped plastic bag finished product towards the middle; a rear folded plate is arranged behind the front folded plate, two guide plates arranged in parallel are arranged below the front folded plate and the rear folded plate, two side pressing plates with opposite openings are respectively arranged above two ends of each guide plate, and the two side pressing plates are connected with a side pressing plate lifting driving device and a side plate transverse movement driving cylinder; an n-shaped bracket connected with the racks on the two sides is arranged above the guide plate, an inserting plate is arranged below the n-shaped bracket, a front indentation plate and a rear indentation plate are respectively arranged in front of and behind the inserting plate, and the inserting plate, the indentation plates and the rear indentation plates are respectively connected through a driving device arranged on the n-shaped bracket; the folding device is characterized in that each side pressing plate is composed of two half-part two-side pressing plates, and the two half-part two-side pressing plates, the front folding plate and the rear folding plate are connected with a length adjusting mechanism for adjusting the front-back distance between each pair of half-part two-side pressing plates and the front-back distance between the front folding plate and the rear folding plate.

The length adjustment mechanism includes: the top end of the side pressing plate lifting driving device is connected with the lifting plate, and the front-and-back moving slide rail is arranged on the lifting plate; a front and rear moving plate mounting opening is respectively arranged at the front and rear positions of the rack corresponding to the positions of the pressing plates at the two sides, a front and rear moving plate capable of sliding and moving back and forth is mounted in the front and rear moving plate mounting opening, and a front and rear moving driving cylinder is respectively mounted between the far ends of the two front and rear moving plates and the rack; the n-shaped support comprises a middle n-shaped support, a front n-shaped support and a rear n-shaped support, and the inserting plate and a driving device thereof are arranged on the middle n-shaped support; the front n-shaped bracket and the rear n-shaped bracket are respectively connected with a corresponding front and rear moving plate; two ends of a front folded plate shaft of the front folded plate and two ends of a rear folded plate shaft of the rear folded plate are respectively and rotatably connected between the front and rear movable plates positioned on two sides of the front side and between the front and rear movable plates positioned on two sides of the rear side; the bottom ends of the pressure plates positioned at the two sides of the half part of the front door and the back door are respectively arranged on a side pressure plate slide rail in a sliding way through side pressure plate slide blocks, the two side pressure plate slide rails are transversely arranged in parallel, and the two ends of the side pressure plate slide rail are respectively arranged on a front-back moving slide rail in a sliding way through a front-back moving slide block; the front and rear moving plates are provided with longitudinal long holes of the front and rear moving plates corresponding to the two ends of the side pressing plate slide rail, and the two ends of the side pressing plate slide rail are inserted into the longitudinal long holes of the front and rear moving plates in a sliding manner; the front and back opposite pair of side press plate slide blocks are respectively connected with a slide bar, the two slide bars are mutually inserted in the side plate front and back moving chute in a sliding way, and the side plate front and back moving chute is connected with a piston rod of the side plate transverse moving driving cylinder.

Still include width adjustment mechanism, this width adjustment mechanism includes: the nut sliding rail, the side pressing plate sliding block, the width adjusting screw, the nut, the screw supporting plate, the nut connecting plate, the nut sliding block, the screw supporting plate sliding block and the screw supporting plate sliding rail are arranged on the lifting plate in the left-right direction; one end of a width adjusting screw rod is rotatably connected to the lower end of a screw rod supporting plate, the screw rod supporting plate is longitudinally and slidably connected to the outer side of the rack, a nut is mounted on the width adjusting screw rod and connected with the outer end of a nut connecting plate, and the inner end of the nut connecting plate penetrates through a middle longitudinal long hole formed in the rack and is connected with a cylinder body of the lateral side plate transverse movement driving cylinder; the lower surface of the nut connecting plate is connected to the nut slide rail in a sliding way through a nut slide block; the other end of the width adjusting screw rod is provided with a width adjusting driving mechanism.

The width adjusting driving mechanism comprises a hand wheel or an electric device adopting automatic control.

The front corner folding mechanism is provided with a front corner folding mechanism width adjusting device.

The plastic bag folding device is provided with two paths, and two edge pressing plate sliders on the same side of each path are connected with each other through a linkage plate.

The side pressing plate lifting driving device comprises: the cylinder body of the lower cylinder is connected to the inner side of the frame, the top end of a piston rod at the upper end of the lower cylinder is connected with the bottom of the upper cylinder, the upper cylinder is fixed on the inverted L-shaped upper cylinder mounting plate, the vertical side of the upper cylinder mounting plate is slidably mounted on the upper cylinder sliding rail through the upper cylinder sliding block, and the upper cylinder sliding rail is longitudinally fixed on the inner side of the frame; the piston rod at the upper end of the upper cylinder penetrates through the transverse part of the upper cylinder mounting plate and is connected with the bottom surface of the lifting plate, a plurality of guide rods are vertically connected with the periphery of the bottom surface of the lifting plate, and the lower ends of the guide rods penetrate through the transverse part of the upper cylinder mounting plate in a sliding mode.

The utility model has the advantages that: the space between the two opposite side pressing plates can be adjusted according to the width of the plastic bag; the two side pressing plates are divided into a front half part and a rear half part, and the length of each side pressing plate is adjusted by adjusting the distance between the front half part and the rear half part; the distance between the front folding plate and the rear folding plate can be correspondingly adjusted, products with different widths and lengths can be processed, the range of the size of the processed product is expanded, the applicability of the machine is improved, and the trouble of replacing parts is eliminated.

Drawings

FIG. 1 is a schematic view of the general structure of the prior art (section B-B of FIG. 2);

FIG. 2 is a cross-sectional view A-A of FIG. 1 (without the front creasing plate, insert plate, and rear creasing plate);

FIG. 3 is a schematic diagram of the general structure of one embodiment of the present invention (a way, with length and width adjustment functions) (section D-D of FIG. 3);

FIG. 4 is a cross-sectional view C-C of FIG. 3 (without the front creasing plate, insert plate, and rear creasing plate);

FIG. 5 is a cross-sectional view E-E of FIG. 4;

FIG. 6 is a schematic perspective view of the length and width adjustment mechanism (two-way) of the present invention;

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a schematic view of the drive connection of the two sets of edge clamps of FIG. 7;

FIG. 9 is a right side view (rotated 90 counterclockwise) of FIG. 8;

FIG. 10 is a bottom view of FIG. 7;

fig. 11 is a schematic view showing the overall structure of another embodiment of the present invention (having only a length adjusting function).

Description of reference numerals: 1. a frame 101, a front and rear moving plate mounting opening, 2, a front corner folding mechanism, 3, a guide plate, 4, an edge pressing plate lifting driving device, 401, a lower air cylinder, 402, an upper air cylinder, 403, a guide rod, 404, an upper air cylinder slide block, 405, an upper air cylinder slide rail, 406, an upper air cylinder mounting plate, 5, a middle n-shaped bracket, 6, a bag pressing hook, 7, a hook driving device, 8, a front folding plate, 9, a front folding plate shaft, 10, a front indentation plate, 11, an insertion plate, 12, a rear indentation plate, 13-15, an air cylinder, 16, two side pressing plates, 161, half two side pressing plates, 162, a sliding rod, 17, a rear folding plate, 18, a middle pressing plate, 19, a middle pressing plate driving device, 20, a product output mechanism, 21, a cross beam, 22, a middle longitudinal long hole, 23, a front n-shaped bracket, 24, a rear n-shaped bracket, 25, a rear folding plate shaft, 26, a front and rear moving plate, 27, a front and rear moving plate driving air cylinder, 28. the side plate transverse movement driving cylinder, 29, a side plate front-back movement sliding groove, 30, a first linkage plate (rod), 31, a second linkage plate (rod), 32, a nut sliding rail, 33, a lifting plate, 34, a front-back movement sliding rail, 35, a middle pressing plate width adjusting device, 36, a front corner folding mechanism width adjusting device, 37, a front-back movement plate longitudinal long hole, 38, an edge pressing plate sliding rail, 39, an edge pressing plate sliding block, 40, a width adjusting driving mechanism, 41, a width adjusting screw rod, 42, a nut, 43, a screw rod supporting plate, 44, a nut connecting plate, 45, a nut sliding block, 46, a screw rod supporting plate sliding block, 47 and a screw rod supporting plate sliding rail; 48. the slider is moved back and forth.

Detailed Description

Referring to fig. 3 to 10, an embodiment of a plastic bag folding apparatus of the present invention, which is capable of processing products of different sizes, includes a front folding mechanism 2 for folding two carrying straps at the front end of a vest-shaped plastic bag product toward the middle, a front flap 8 for folding the front portion of the plastic bag product backward, a rear flap 17 for folding the rear portion of the plastic bag product forward, the front folding mechanism 2 being disposed in front of the front flap 8; a rear folding plate 17 is arranged behind the front folding plate 8, two guide plates 3 which are arranged in parallel are arranged below the space between the front folding plate 8 and the rear folding plate 17, two side pressing plates 16 with opposite openings are respectively arranged above two ends of each guide plate 3, and the two side pressing plates 16 are connected with an edge pressing plate lifting driving device 4 and an edge side plate transverse movement driving cylinder 28; an n-shaped bracket connected with the machine frame 1 at two sides is arranged above the guide plate 3, an inserting plate 11 is arranged below the n-shaped bracket, a front indentation plate 10 and a rear indentation plate 12 are respectively arranged at the front and the rear of the inserting plate 11, and the inserting plate, the indentation plates and the rear indentation plates are respectively connected through a driving device arranged on the n-shaped bracket. The above is the prior art.

The method is characterized in that: each of the two side pressing plates 16 is composed of two half-part two side pressing plates 161, and the two half-part two side pressing plates 161, the front folding plate 8 and the rear folding plate 17 are all connected with a length adjusting mechanism for adjusting the front-rear spacing of each pair of half-part two side pressing plates 161 and the front-rear spacing (corresponding to the length of the product) of the front folding plate 8 and the rear folding plate 17; the interval (corresponding to the width of the product) between the pressing plates 161 on the left and right opposite halves is adjusted by a width adjusting mechanism.

The length adjustment mechanism includes: the front and back moving plate 26, the front and back moving driving cylinder 27, the lifting plate 33 and the front and back moving slide rail 34, the lifting plate 33 is connected with the top end of the side pressing plate lifting driving device 4, and the front and back moving slide rail 34 is arranged on the lifting plate 33; a front and rear moving plate mounting opening 101 is respectively arranged at the front and rear positions of the frame 1 corresponding to the positions of the pressing plates 16 at the two sides, a front and rear moving plate 26 capable of sliding and moving back and forth is mounted in the front and rear moving plate mounting opening 101, and a front and rear movement driving cylinder 27 is respectively mounted between the far ends of the two front and rear moving plates 26 and the frame 1; the n-shaped bracket comprises a middle n-shaped bracket 5, a front n-shaped bracket 23 and a rear n-shaped bracket 24, and the inserting plate 11 and a driving device thereof are arranged on the middle n-shaped bracket 5; the front n-shaped bracket 23 and the rear n-shaped bracket 24 are respectively connected with a corresponding front and rear moving plate 26; the two ends of the front flap shaft 9 of the front flap 8 and the rear flap shaft 25 of the rear flap 17 are respectively and rotatably connected between the front and rear moving plates 26 at the two sides of the front part and between the front and rear moving plates 26 at the two sides of the rear part; the bottom ends of the pressure plates 161 positioned at the two sides of the half part of the front door and the back door are respectively arranged on one side pressure plate slide rail 38 in a sliding way through the side pressure plate slide block 39, the two side pressure plate slide rails 38 are transversely arranged in parallel, and the two ends of the side pressure plate slide rail 38 are respectively arranged on the front-back moving slide rail 34 in a sliding way through the front-back moving slide block 48; the front and rear moving plate 26 is provided with front and rear moving plate longitudinal long holes 37 corresponding to both ends of the side press plate slide rails 38, and both ends of the side press plate slide rails 38 are slidably inserted into the front and rear moving plate longitudinal long holes 37; the pair of side press plate sliders 39 opposite to each other in the front and rear direction are connected to a slide bar 162, and the two slide bars 162 are inserted into the side plate forward-backward moving slide groove 29 in a mutually sliding manner, and the side plate forward-backward moving slide groove 29 is connected to a piston rod of the side plate lateral movement driving cylinder 28.

The above-mentioned forward and backward movement driving cylinder 27 can be replaced by conventional techniques having the same function, such as screw nuts, rack and pinion, automatically controlled electric devices, etc.

The working principle of the length adjusting mechanism is as follows: the forward and backward movement driving cylinder 27 drives the forward and backward moving plate 26 to move forward and backward relatively, the forward and backward moving plate 26 drives the side pressing plate slide rails 38 to move synchronously through the longitudinal long holes 37 of the forward and backward moving plate, the side pressing plate slide rails 38 drive the side pressing plate slide blocks 39 to move forward and backward, and the pressing plates 161 on two sides of a pair of corresponding front and back halves move forward and backward relatively; an edge pressure plate slider 39; the side press plate slide rail 38 can move up and down in the longitudinal long hole 37 of the front and rear moving plate, and the lifting function of the press plates 161 at the two sides of the half part is not influenced; the forward and rearward movement plate 26 also moves the front flap shaft 9 of the front flap 8 and the rear flap shaft 25 of the rear flap 17 in synchronization. The adjustment of the distance between the front end and the rear end of the front folding plate 8 and the rear folding plate 17 and the distance between the press plates 161 at the two sides of the front half part and the rear half part (about one third of the length of the plastic bag) is realized so as to adapt to the folding of products with different lengths.

The width adjustment mechanism includes: the nut slide rail 32, the side pressing plate slide rail 38, the side pressing plate slide block 39, the width adjusting screw 41, the nut 42, the screw support plate 43, the nut connecting plate 44, the nut slide block 45, the screw support plate slide block 46 and the screw support plate slide rail 47 are arranged on the lifting plate 33, and the nut slide rail 32 in the left-right direction is arranged on the lifting plate 33; one end of the width adjusting screw 41 is rotatably connected with the lower end of the screw supporting plate 43, the screw supporting plate 43 is longitudinally and slidably connected with a screw supporting plate slide rail 47 on the outer side of the machine frame 1 through a screw supporting plate slide block 46, a nut 42 is arranged on the width adjusting screw 41, the nut 42 is connected with the outer end of a nut connecting plate 44, the inner end of the nut connecting plate 44 penetrates through a middle longitudinal long hole 22 arranged on the machine frame 1 and is connected with a cylinder body of the side plate transverse movement driving cylinder 28; the lower surface of the nut connecting plate 44 is connected to the nut slide rail 32 in a sliding manner through a nut slide block 45; a width adjustment drive mechanism 40 is mounted on the other end of the width adjustment screw 41.

The width adjustment driving mechanism 40 includes a handwheel or an electric device with automatic control.

The intermediate press plate 18 can also be adjusted in width by an intermediate press plate width adjustment device 35, and the front corner folding mechanism 2 can also be adjusted in width by a front corner folding mechanism width adjustment device 36. And the width adjusting mechanism is matched for adjustment. The intermediate platen width adjustment device 35 and the front corner folding mechanism width adjustment device 36 are conventional.

The working principle of the width adjusting mechanism is as follows: the width adjusting screw 41 is driven to rotate through the width adjusting driving mechanism 40, the nut 42 is driven to move left and right, and the nut 42 drives the nut connecting plate 44 (through the lower nut sliding block 45) to move along the nut sliding rail 32; the nut connecting plate 44 drives the side plate to transversely move to drive the air cylinder 28 to synchronously move, the piston rod of the side plate drives the side plate front-back moving chute 29 to move left and right, and the side plate front-back moving chute 29 drives the two half-part side pressing plates 161 to simultaneously move left and right along the side pressing plate slide rail 38 through the side pressing plate slide block 39 by the slide rod 162; the width adjustment screw 41 is supported by a screw support plate 43, and the screw support plate 43 is movable up and down by a screw support plate slider 46 and a screw support plate slide rail 47.

The plastic bag folding apparatus may be a single path (as shown in fig. 1-4) for processing (folding) a single path of input products (plastic bags). Two paths (two paths of products are processed simultaneously) can also be provided, each device is provided with two sets of numbers (shown in figures 6-9) which are symmetrical side by side, wherein two edge pressing plate sliding blocks 39 on the opposite sides of each path are connected with each other through a linkage plate, as shown in figure 8: the two front or rear left side edge pressing plate sliding blocks 39 are connected with each other through a first linkage plate (rod) 30, and the two right side edge pressing plate sliding blocks 39 are connected with each other through a second linkage plate (rod) 31. Thus, the two side pressing plate sliding blocks 39 on the same side of the two paths are driven by the linkage plate to synchronously move left and right.

The side pressing plate lifting driving device 4 comprises: the air cylinder comprises a lower air cylinder 401, an upper air cylinder 402, a guide rod 403, an upper air cylinder slide block 404, an upper air cylinder slide rail 405 and an upper air cylinder mounting plate 406, wherein the cylinder body of the lower air cylinder 401 is connected to the inner side of the frame 1, the top end of a piston rod at the upper end of the lower air cylinder 401 is connected with the bottom of the upper air cylinder 402, the upper air cylinder 402 is fixed on the inverted L-shaped upper air cylinder mounting plate 406, the vertical side of the upper air cylinder mounting plate 406 is slidably mounted on the upper air cylinder slide rail 405 through the upper air cylinder slide block 404, and the upper air cylinder slide rail 405 is longitudinally fixed on the inner side of the frame 1; the piston rod of the upper end of the upper cylinder 402 passes through the lateral portion of the upper cylinder mounting plate 406 and is coupled to the bottom surface of the elevating plate 33, a plurality of guide rods 403 are vertically coupled to the periphery of the bottom surface of the elevating plate 33, and the lower ends of the guide rods 403 slidably pass through the lateral portion of the upper cylinder mounting plate 406.

The side platen lifting/lowering driving device 4 may control the lifting/lowering height of the platens 161 on both sides of the half portion in stages by the lower cylinder 401 and the upper cylinder 402, so as to better realize the functions of the platens 161 on both sides of the half portion.

Referring to fig. 11, this embodiment has only the function of length adjustment (i.e., adjusting the distance between the pressing plates 161 on both sides of the two halves corresponding to the front and back), and the structure and components related to the function of width adjustment in the previous embodiment (fig. 4) are eliminated.

Claims (7)

1. A plastic bag folding device capable of processing products with different sizes comprises a front angle folding mechanism (2) for folding two lifting belts at the front end of a vest-shaped plastic bag finished product towards the middle, a front folded plate (8) for folding the front part of the plastic bag finished product backwards, a rear folded plate (17) for folding the rear part of the plastic bag finished product forwards, wherein the front angle folding mechanism (2) is arranged in front of the front folded plate (8); a rear folded plate (17) is arranged behind the front folded plate (8), two guide plates (3) which are arranged in parallel are arranged below the front folded plate (8) and the rear folded plate (17), two side pressing plates (16) with opposite openings are respectively arranged above the two ends of each guide plate (3), and the two side pressing plates (16) are connected with a side pressing plate lifting driving device (4) and a side plate transverse movement driving cylinder (28); an n-shaped bracket connected with the machine frame (1) at two sides is arranged above the guide plate (3), an inserting plate (11) is arranged below the n-shaped bracket, a front indentation plate (10) and a rear indentation plate (12) are respectively arranged at the front and the rear of the inserting plate (11), and the inserting plate, the indentation plates and the rear indentation plates are respectively connected through a driving device arranged on the n-shaped bracket; the folding table is characterized in that each two-side pressing plate (16) is composed of two half-part two-side pressing plates (161), and the two half-part two-side pressing plates (161), the front folding plate (8) and the rear folding plate (17) are connected with a length adjusting mechanism for adjusting the front-rear distance between each pair of half-part two-side pressing plates (161) and the front-rear distance between the front folding plate (8) and the rear folding plate (17).

2. A plastic bag folding apparatus capable of processing products of various sizes as claimed in claim 1, wherein said length adjusting mechanism comprises: the device comprises a front and rear moving plate (26), a front and rear moving driving cylinder (27), a lifting plate (33) and a front and rear moving slide rail (34), wherein the top end of the side pressing plate lifting driving device (4) is connected with the lifting plate (33), and the front and rear moving slide rail (34) is arranged on the lifting plate (33); a front and rear moving plate mounting opening (101) is respectively arranged at the front and rear positions of the frame (1) corresponding to the positions of the pressing plates (16) at the two sides, a front and rear moving plate (26) capable of sliding and moving back and forth is mounted in the front and rear moving plate mounting opening (101), and a front and rear moving driving cylinder (27) is respectively mounted between the far ends of the two front and rear moving plates (26) and the frame (1); the n-shaped support comprises a middle n-shaped support (5), a front n-shaped support (23) and a rear n-shaped support (24), and the middle n-shaped support (5) is provided with the inserting plate (11) and a driving device thereof; the front n-shaped bracket (23) and the rear n-shaped bracket (24) are respectively connected with a corresponding front and rear moving plate (26); two ends of a front folded plate shaft (9) of the front folded plate (8) and two ends of a rear folded plate shaft (25) of the rear folded plate (17) are respectively and rotatably connected between the front and rear moving plates (26) positioned on two sides of the front side and between the front and rear moving plates (26) positioned on two sides of the rear side; the bottom ends of the pressure plates (161) positioned at the two sides of the half part of the front door and the back door are respectively arranged on a side pressure plate slide rail (38) in a sliding way through side pressure plate slide blocks (39), the two side pressure plate slide rails (38) are transversely arranged in parallel, and the two ends of each side pressure plate slide rail (38) are respectively arranged on the front-back moving slide rail (34) in a sliding way through the front-back moving slide block (48); the front and rear moving plate (26) is provided with a front and rear moving plate longitudinal long hole (37) corresponding to the two ends of the side pressure plate slide rail (38), and the two ends of the side pressure plate slide rail (38) are inserted into the front and rear moving plate longitudinal long hole (37) in a sliding way; a pair of side pressing plate sliding blocks (39) which are opposite in front and back are respectively connected with a sliding rod (162), the two sliding rods (162) are mutually and slidably inserted in the side plate front-back moving sliding groove (29), and the side plate front-back moving sliding groove (29) is connected with a piston rod of the side plate transverse moving driving cylinder (28).

3. A plastic bag folding apparatus capable of processing products of different sizes as claimed in claim 2, further comprising a width adjusting mechanism including: the nut sliding rail (32) is arranged on the lifting plate (33) in the left-right direction; one end of a width adjusting screw rod (41) is rotatably connected to the lower end of a screw rod supporting plate (43), the screw rod supporting plate (43) is longitudinally and slidably connected to the outer side of the rack (1), a nut (42) is mounted on the width adjusting screw rod (41), the nut (42) is connected with the outer end of a nut connecting plate (44), the inner end of the nut connecting plate (44) penetrates through a middle longitudinal long hole (22) formed in the rack (1) and is connected with a cylinder body of the side plate transverse movement driving cylinder (28); the lower surface of the nut connecting plate (44) is connected to the nut slide rail (32) in a sliding way through a nut slide block (45); the other end of the width adjusting screw rod (41) is provided with a width adjusting driving mechanism (40).

4. Plastic bag folding apparatus capable of processing products of different sizes according to claim 3, characterized in that the width adjustment driving mechanism (40) comprises a hand wheel or an electric device with automatic control.

5. Plastic bag folding apparatus capable of processing products of different sizes according to claim 3, characterized in that an intermediate press plate (18) and its driving means are provided above the rear part of the frame (1), the intermediate press plate (18) is provided with intermediate press plate width adjusting means (35), and the front corner folding mechanism (2) is provided with front corner folding mechanism width adjusting means (36).

6. The plastic bag folding apparatus capable of processing products of different sizes as claimed in claim 2, wherein said plastic bag folding apparatus has two paths, and two edge pressing plate sliders (39) on the same side of each path are connected to each other through a linkage plate.

7. A plastic bag folding apparatus capable of processing products of various sizes as claimed in claim 2, wherein said edge pressing plate elevation driving means (4) comprises: the air cylinder structure comprises a lower air cylinder (401), an upper air cylinder (402), a guide rod (403), an upper air cylinder sliding block (404), an upper air cylinder sliding rail (405) and an upper air cylinder mounting plate (406), wherein the body of the lower air cylinder (401) is connected to the inner side of a rack (1), the top end of a piston rod at the upper end of the lower air cylinder (401) is connected with the bottom of the upper air cylinder (402), the upper air cylinder (402) is fixed on the inverted L-shaped upper air cylinder mounting plate (406), the vertical side of the upper air cylinder mounting plate (406) is slidably mounted on the upper air cylinder sliding rail (405) through the upper air cylinder sliding block (404), and the upper air cylinder sliding rail (405) is longitudinally fixed to the inner side of the rack (1); a piston rod at the upper end of the upper cylinder (402) penetrates through the transverse part of the upper cylinder mounting plate (406) and is connected with the bottom surface of the lifting plate (33), a plurality of guide rods (403) are vertically connected with the periphery of the bottom surface of the lifting plate (33), and the lower ends of the guide rods (403) penetrate through the transverse part of the upper cylinder mounting plate (406) in a sliding mode.

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