An automatic plastic bag opening mechanism and its working method

Abstract

The present invention relates to the field of automated packaging technology, and discloses an automated plastic bag bag-opening mechanism and its working method, which includes a lifting motor, a transfer structure, a spreading and closing mechanism, a bag-opening motor, and a moving mechanism. In the present invention, after the packaging bag is opened, the deformation plate in the guiding plate abuts against the inner side of the packaging bag. Under the opening force, the middle of the deformation plate presses against the inclined rod, causing the expansion plate to open in an outward V shape, preventing the edge position of the plastic bag from easily touching the packaging bag and causing instability during packaging, avoiding the plastic bag being too thick when being bagged and affecting bagging. Moreover, when the lower suction box and the upper suction box adsorb the packaging bag, the packaging bag is arc-opened on the surface of the arc-shaped smooth plate, and the packaging bag adsorbs and moves towards the suction hole position, forming an "L" - shaped bend at the position where the packaging bag is adsorbed, increasing the stability of the packaging bag opening, preventing the inertial force generated when the plastic bag is pushed into the packaging bag from easily pushing the packaging bag, and avoiding the sliding between the lower suction box and the packaging bag from affecting the stability of bagging.

Description

Technical Field

[0001] The present invention relates to the technical field of automated packaging, and specifically to an automated plastic bag bag-opening mechanism and its working method. Background Art

[0002] When producing plastic bags, the plastic bags need to be packaged. The automated bag-opening mechanism can automatically open the bags, enabling the plastic bag products to be more smoothly loaded into the bags, significantly improving the packaging efficiency. Since the bag-opening plate opens the bags by moving left and right, but when opening the packaging bag, it uses the method of expanding left and right, and the height during opening is relatively low. The upper and lower edges of the plastic bag are easily touched by the opening edge of the packaging bag. After being touched, it is easy to fold or even push the packaging bag away during the loading process of the plastic bag, affecting the loading of thicker plastic bags. Moreover, when the bag-opening plate is loaded, when the plastic bag reaches the predetermined position, the plastic bag is easily pushed by inertia when being pushed into the bag, and it is easy to cause the bag-opening plate to slide relative to the packaging bag, affecting the stability of bag loading. Summary of the Invention

[0003] The present invention provides an automated plastic bag bag-opening mechanism and its working method, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] An automated plastic bag bag-opening mechanism includes a lifting motor, a transfer structure, a folding and unfolding mechanism for opening the packaging bag, a bag-opening motor, and a moving mechanism. The bag-opening motor is arranged at the lower end of the moving mechanism. A transverse rod is provided on the surface of the transfer structure, and the lower end of the moving mechanism translates on the transverse rod of the transfer structure. The folding and unfolding mechanism is located on the right side of the moving mechanism, and the moving mechanism translates and inserts into the middle of the folding and unfolding mechanism. The lifting motor is arranged at the lower end of the transfer structure and pushes the transfer structure to move up and down;

[0006] The moving mechanism is provided with a limit block, a slider, a connecting plate, a bag-opening plate, and a ball screw. The bag-opening plate is arranged on the upper surface of the slider. A synchronous pulley is provided at the output end of the bag-opening motor, and the bag-opening motor drives and drives the ball screw to rotate through the synchronous pulley. The limit block is fixed on the surface of the connecting plate, and the ball screw rotates in the middle of the limit block. Two nuts, one positive and one negative, are provided on the ball screw, and the nuts are fixed in the two sliders. When the ball screw rotates, it drives the nuts to move left and right respectively;

[0007] The transfer structure is provided with a flat plate, a retractable cylinder, a sliding rod and a fixing plate. The sliding rod is arranged at the lower end of the flat plate, the fixing plate is arranged at the lower end of the flat plate, and the retractable cylinder is fixed at the lower end of the flat plate. The output end of the retractable cylinder is connected to the lower end of the connecting plate to pull and translate. The fixing plate is provided with a threaded structure which meshes with the output end of the fixed lifting motor, and the fixing plate is driven by the engagement of the lifting motor to lift the flat plate;

[0008] The opening and closing mechanism is provided with a force-bearing plate, a lower adsorption box, a pusher, a support rod and an upper adsorption box. The force-bearing plate is arranged on the side of the support rod. The upper adsorption box and the lower adsorption box adsorb the packaging bag up and down to open it. The pusher is arranged at the lower end of the force-bearing plate, and the upper adsorption box is connected to the lower end of the force-bearing plate. The pusher is driven by an electric signal to push the force-bearing plate and the support rod to perform a lifting activity, and the force-bearing plate drives the upper adsorption box to adsorb the packaging bag to open it. After the packaging bag is opened, the retractable cylinder drives the flat plate to translate, so that the bag-supporting plate is inserted between the upper adsorption box and the lower adsorption box. When the ball screw rotates, the bag-supporting plates on the two sliders push the packaging bag outwards and elastically expand the packaging bag.

[0009] A preferred technical solution: The bag-supporting plate is provided with an opening plate, a guiding plate, an angle plate and a vertical plate. The guiding plate is arranged at the upper end of the vertical plate, and the opening plate is arranged on the side of the vertical plate. The angle plate is fixed at the upper end of the slider, and the vertical plate fixed on the side of the angle plate is perpendicular above the slider. The two sliders move in opposite directions on the ball screw and push the guiding plate to open the packaging bag outwards. When the plastic bag is bagged, it slides into the opened packaging bag from the opening plate.

[0010] A preferred technical solution: The guiding plate is provided with a pressing plate, an inclined rod, a sponge plate, an expanding plate and a deformable plate. The sponge plate is arranged inside the expanding plate. The two ends of the inclined rod are fixed on the two side surfaces of the deformable plate and the expanding plate, and the two inclined rods are symmetrically distributed up and down. The outside of the deformable plate contacts and presses the packaging bag, so that the deformable plate presses the inclined rod and pushes the two expanding plates outwards.

[0011] A preferred technical solution: The lower adsorption box is provided with a hollow box, an adsorption plate and a hollow tube. The adsorption plate is arranged on the surface of the hollow box. The hollow tube is communicated with the lower end inside the hollow box, and the hollow tube adsorbs in a vacuum inside the hollow box, so that one side of the packaging bag on the surface of the adsorption plate is adsorbed and opened.

[0012] A preferred technical solution: The adsorption plate is provided with suction holes, a blocking strip and a smooth plate. There are three suction holes, which are arranged equidistantly inside the smooth plate. The adsorption force inside the hollow box makes the suction holes suck air inwards and makes the packaging bag fit on the surface of the smooth plate. The blocking strip is located at the upper right end of the suction hole and is fixed on the surface of the smooth plate. When the packaging bag is adsorbed inwards at the position of the suction hole, the blocking strip blocks the packaging bag and makes the packaging bag form an "L" - shaped bend.

[0013] A preferred technical solution: the surface of the smooth plate is arc-shaped, and the suction holes are in an arc-shaped state on the surface of the smooth plate to absorb one side of the packaging bag.

[0014] A better technical solution: the deformation plate is a convex structure, and the convex part is higher than the pressure plate. When the deformation plate expands the packaging bag, it presses one end of the tilting rod under the reaction force of the expansion, and causes the tilting rod to squeeze the expansion plate outward.

[0015] A working method of an automatic bag-opening mechanism for plastic bags, applied to the above-mentioned automatic bag-opening mechanism for plastic bags, the working method comprises the following specific steps:

[0016] S1: When the packaging bag is finished, it is sent to the predetermined lower adsorption box position, so that the electric signal controls the pusher to push the force plate down, driving the upper adsorption box to the corresponding lower adsorption box position, and the lower adsorption box and the upper adsorption box are synchronously opened outwards and adsorb the packaging bag;

[0017] S2: After the packaging bag is opened between the lower adsorption box and the upper adsorption box, the output end of the lifting motor is controlled to drive the fixed plate to lift, so that the flat plate is lifted horizontally at the position of the sliding rod, and the bag support plate is lifted to the corresponding middle horizontal line of the lower adsorption box and the upper adsorption box;

[0018] S3: The connecting plate is pulled to translate on the surface of the plane plate through the output end of the advancing and retreating air cylinder, so that the bag support plate is inserted into the packaging bags of the lower adsorption box and the upper adsorption box;

[0019] S4: Then the bag-holding motor drives the ball screw to rotate through the synchronous wheel, so that the ball screw rotates under the limit of the limit block. After the ball screw rotates, the two sliders open and close outward, and the two bag-holding plates hold the packaging bag outward. The bag-holding action is completed. After the bagging action is completed, each part returns to its original position and waits for the next packaging bag.

[0020] Compared with the prior art, this technical solution has the following advantages:

[0021] The bag-opening plate of the present invention is inserted into the packaging bag, and the reverse movement of the slider drives the bag-opening plate to open the packaging bag outward. After the packaging bag is opened, the deformation plate in the guide plate presses against the inner side of the packaging bag. Under the force of opening, the middle of the deformation plate presses against the tilting rod, and the tilting rod presses the expansion plate outward, so that the expansion plate opens in an outward-facing "eight" shape, and the outer side of the deformation plate increases the friction with the packaging bag. At this time, the expansion plate opens outward to increase the upper and lower widths of the opened packaging bag, so that the plastic bag slides from the middle of the trapezoidal structure of the expansion plate into the tilting rod during packaging, thereby preventing the edge of the plastic bag from easily touching the packaging bag and causing instability during packaging, and avoiding the plastic bag from being too thick when bagging and affecting the bagging.

[0022] In the present invention, when the lower adsorption box and the upper adsorption box adsorb the packaging bag, the packaging bag is arc-opened on the surface of the arc-shaped smooth plate, and the packaging bag is adsorbed and moves towards the suction hole position, so that the blocking strip position blocks at the edge of the suction hole, forming an "L"-shaped bend at the position where the packaging bag is adsorbed, increasing the stability of the opening of the packaging bag, preventing the inertial force generated when the plastic bag is pushed into the packaging bag from easily pushing the packaging bag, and avoiding the sliding between the lower adsorption box and the packaging bag from affecting the stability of bagging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] Figure 1 It is the overall view of the present invention.

[0025] Figure 2 It is the three-dimensional schematic diagram of the moving mechanism and the transfer structure.

[0026] Figure 3 It is the three-dimensional schematic diagram of the opening and closing mechanism.

[0027] Figure 4 It is the three-dimensional schematic diagram of the bag-supporting plate.

[0028] Figure 5 It is the side view schematic diagram of the guide plate.

[0029] Figure 6 It is the three-dimensional and side view schematic diagrams of the lower adsorption box.

[0030] Figure 7 It is the enlarged schematic diagram of the partial A of the adsorption plate.

[0031] In the figure: lifting motor - 1, transfer structure - 2, opening and closing mechanism - 3, bag-supporting motor - 4, moving mechanism - 5.

[0032] Flat plate - 21, advancing and retracting air cylinder - 22, sliding rod - 23, fixing plate - 24, limit block - 51, slider - 52, connecting plate - 53, bag-supporting plate - 54, ball screw - 55.

[0033] Force-bearing plate - 31, lower adsorption box - 32, pusher - 33, support rod - 34, upper adsorption box - 35.

[0034] Opening plate - 541, guide plate - 542, corner plate - 543, vertical plate - 544.

[0035] Pressing plate - 5421, inclined rod - 5422, sponge plate - 5423, expanding plate - 5424, deforming plate - 5425.

[0036] Hollow box - 321, adsorption plate - 322, hollow tube - 323, suction hole - 3221, blocking strip - 3222, smooth plate - 3223. Detailed implementation mode

[0037] As Figures 1 to 7 shown, an automatic plastic bag bag-supporting mechanism is proposed in the present invention, which includes a lifting motor 1, a transfer structure 2, a clamping mechanism 3 for opening and closing a packaging bag, a bag-supporting motor 4 and a moving mechanism 5. The bag-supporting motor 4 is arranged at the lower end of the moving mechanism 5. A transverse rod is arranged on the surface of the transfer structure 2, and the lower end of the moving mechanism 5 translates on the transverse rod of the transfer structure 2. The clamping mechanism 3 is located on the right side of the moving mechanism 5, and the moving mechanism 5 translates and inserts into the middle of the clamping mechanism 3. The lifting motor 1 is arranged at the lower end of the transfer structure 2 and pushes the transfer structure 2 to move up and down;

[0038] The moving mechanism 5 is provided with a limit block 51, a slider 52, a connecting plate 53, a bag-supporting plate 54 and a ball screw 55. The bag-supporting plate 54 is arranged on the upper surface of the slider 52. A synchronous pulley is arranged at the output end of the bag-supporting motor 4, and the bag-supporting motor 4 drives and drives the ball screw 55 to rotate through the synchronous pulley. The limit block 51 is fixed on the surface of the connecting plate 53, and the ball screw 55 rotates in the middle of the limit block 51. Two positive and negative nuts are arranged on the ball screw 55, and the nuts are fixed in the two sliders 52. When the ball screw 55 rotates, it drives the nuts to move left and right respectively;

[0039] The transfer structure 2 is provided with a flat plate 21, a retracting and extending air cylinder 22, a sliding rod 23 and a fixing plate 24. The sliding rod 23 is arranged at the lower end of the flat plate 21, the fixing plate 24 is arranged at the lower end of the flat plate 21, the retracting and extending air cylinder 22 is fixed at the lower end of the flat plate 21, and the output end of the retracting and extending air cylinder 22 is connected to the lower end position of the connecting plate 53 to pull and translate. The fixing plate 24 is provided with a threaded structure, and the threaded structure meshes with the output end of the fixed lifting motor 1, and drives the fixing plate 24 to lift the flat plate 21 through the meshing of the lifting motor 1;

[0040] The clamping mechanism 3 is provided with a stress plate 31, a lower adsorption box 32, a pusher 33, a support rod 34 and an upper adsorption box 35. A stress plate 31 is arranged on the side of the support rod 34. The upper adsorption box 35 and the lower adsorption box 32 adsorb and open the packaging bag up and down. The pusher 33 is arranged at the lower end of the stress plate 31, and the lower end of the stress plate 31 is connected to the upper adsorption box 35. The pusher 33 is driven by an electric signal to push the stress plate 31 and the support rod 34 to perform lifting activities, and the stress plate 31 drives the upper adsorption box 35 to adsorb and open the packaging bag. After the packaging bag is opened, the retracting and extending air cylinder 22 drives the flat plate 21 to translate, so that the bag-supporting plate 54 is inserted between the upper adsorption box 35 and the lower adsorption box 32. When the ball screw 55 rotates, the bag-supporting plates 54 on the two sliders 52 push the packaging bag outwards and elastically expand the packaging bag.

[0041] Among them, the bag-supporting plate 54 is provided with an opening plate 541, a guiding plate 542, a corner plate 543 and a vertical plate 544. The guiding plate 542 is arranged at the upper end of the vertical plate 544, and the opening plate 541 is arranged on the side of the vertical plate 544. The corner plate 543 is fixed to the upper end of the slider 52, and the vertical plate 544 fixed to the side of the corner plate 543 is perpendicular above the slider 52. The two sliders 52 move in opposite directions on the ball screw 55 and push the guiding plate 542 to open the packaging bag outwards. When the plastic bag is being bagged, it slides into the packaging bag opened by the guiding plate 542 from the opening plate 541.

[0042] Among them, the guiding plate 542 is provided with a pressing plate 5421, an inclined rod 5422, a sponge plate 5423, an expanding plate 5424 and a deformation plate 5425. The sponge plate 5423 is arranged inside the expanding plate 5424. The two ends of the inclined rod 5422 are fixed to the two side surfaces of the deformation plate 5425 and the expanding plate 5424, and the two inclined rods 5422 are symmetrically distributed up and down. The outer side of the deformation plate 5425 contacts and presses the packaging bag, so that the deformation plate 5425 presses the inclined rod 5422 and opens the two expanding plates 5424 outwards.

[0043] Moreover, the inward convex shape of the expanding plate 5424 is a trapezoidal structure, and the hypotenuse of the trapezoidal structure has a guiding effect. When the plastic bag slides in from the trapezoidal structure, the plastic bag is limited to the middle position between the two expanding plates 5424, so that the plastic bag is farther from the outer edge of the expanding plate 5424.

[0044] In the present invention, when the packaging bag is conveyed to the surface of the lower adsorption box 32, the pusher 33 pushes the upper adsorption box 35 to move downwards and presses against the packaging bag on the surface of the lower adsorption box 32. Thus, the lower adsorption box 32 and the upper adsorption box 35 adsorb the packaging bag through the vacuum pump. When the lower adsorption box 32 and the upper adsorption box 35 move outwards, the packaging bag is opened. Then, under the lifting of the flat plate 21 by the lifting motor 1, the translation of the connecting plate 53 by the advancing and retracting cylinder 22, and the rotation of the ball screw 55 by the bag-supporting motor 4, the bag-supporting plate 54 is inserted into the packaging bag, and the bag-supporting plate 54 is driven to open the packaging bag outwards by the reverse movement of the slider 52. After the packaging bag is opened, the deformation plate 5425 in the guiding plate 542 abuts against the inner side of the packaging bag. Under the acting force of the opening, the middle of the deformation plate 5425 presses against the inclined rod 5422, and the inclined rod 5422 presses the expanding plate 5424 outwards, so that the expanding plate 5424 opens in an outward V shape. And the outer side of the deformation plate 5425 increases the friction force with the packaging bag. At this time, the expanding plate 5424 opens outwards to increase the upper and lower widths of the opened packaging bag, so that the plastic bag slides into the inclined rod 5422 from the middle of the trapezoidal structure of the expanding plate 5424 during packaging, preventing the edge position of the plastic bag from easily touching the packaging bag and causing instability during packaging, and avoiding the influence on bagging due to the excessive thickness of the plastic bag during bagging.

[0045] Among them, the lower adsorption box 32 is provided with a hollow box 321, an adsorption plate 322 and a hollow tube 323. The adsorption plate 322 is arranged on the surface of the hollow box 321. The hollow tube 323 is connected to the lower end of the hollow box 321, and the hollow tube 323 is vacuum adsorbed in the hollow box 321, so that one side of the packaging bag on the surface of the adsorption plate 322 is adsorbed and opened.

[0046] Among them, the adsorption plate 322 is provided with a suction hole 3221, a blocking bar 3222 and a smooth plate 3223. The suction holes 3221 are provided with three, which are equidistantly arranged inside the smooth plate 3223. The adsorption force in the hollow box 321 makes the suction hole 3221 suck air inward and makes the packaging bag fit on the surface of the smooth plate 3223. The blocking bar 3222 is located at the upper right end of the suction hole 3221, and the blocking bar 3222 is fixed on the surface of the smooth plate 3223. When the packaging bag is adsorbed inward at the position of the suction hole 3221, the blocking bar 3222 blocks the packaging bag and makes the packaging bag form an "L" shape bend.

[0047] In addition, a hydraulic press is provided at the lower end of the hollow tube 323, and a vacuum pump is provided at the connection of the lower end of the hollow tube 323. When the hydraulic press pushes the hollow tube 323 to move, the vacuum pump extracts air. The hydraulic press at the lower end of the hollow tube 323 moves synchronously with the pusher 33, and a vacuum pump is provided on the upper side of the upper adsorption box 35 to extract air from the lower side of the upper adsorption box 35.

[0048] In addition, the surface of the smooth plate 3223 is arc-shaped, and the suction hole 3221 adsorbs one side of the packaging bag in an arc-shaped state on the surface of the smooth plate 3223. The blocking bar 3222 is made of rubber, and the side close to the suction hole 3221 is relatively rough. The packaging bag is blocked by the blocking bar 3222, and the packaging bag moves smoothly on the surface of the smooth plate 3223, so that the packaging bag forms different friction forces under the inward adsorption force of the suction hole 3221 to limit the position.

[0049] Furthermore, the deformation plate 5425 is a convex structure, and the convex part is higher than the pressure plate 5421. When the deformation plate 5425 opens the packaging bag, it presses one end of the tilting rod 5422 under the reaction force of the opening, and causes the tilting rod 5422 to squeeze the expansion plate 5424 outward.

[0050] In the present invention, when the lower adsorption box 32 and the upper adsorption box 35 adsorb the packaging bag, the hollow tube 323 moves downward, and a vacuum adsorption force is formed in the hollow box 321 through a vacuum pump, so that an adsorption force is generated inward at the suction holes 3221 to adsorb the packaging bag. At this time, the packaging bag is arc-opened on the surface of the arc-shaped smooth plate 3223, and the packaging bag adsorbs and moves toward the position of the suction holes 3221, so that the blocking strip 3222 blocks at the edge of the suction holes 3221, forming an "L"-shaped bend at the position where the packaging bag is adsorbed, increasing the stability of the opening of the packaging bag, preventing the inertial force generated when the plastic bag is pushed into the packaging bag from easily pushing the packaging bag, and avoiding the sliding between the lower adsorption box 32 and the packaging bag from affecting the stability of bagging.

[0051] A working method of a plastic bag automatic bag-opening mechanism, which is applied to the above-mentioned plastic bag automatic bag-opening mechanism. The working method includes the following specific steps:

[0052] S1: After the packaging bag is manufactured, it is sent to the predetermined position of the lower adsorption box 32. Then, an electric signal controls the pusher 33 to push the force-bearing plate 31 downward, driving the upper adsorption box 35 to abut against the corresponding lower adsorption box 32 position, and the lower adsorption box 32 and the upper adsorption box 35 synchronously open outward and adsorb the packaging bag;

[0053] S2: After the packaging bag is opened between the lower adsorption box 32 and the upper adsorption box 35, control the output end of the lifting motor 1 to drive the fixed plate 24 to lift and lower, so that the flat plate 21 horizontally lifts and lowers at the position of the sliding rod 23, and the bag-opening plate 54 is lifted to the horizontal line in the middle of the corresponding lower adsorption box 32 and upper adsorption box 35;

[0054] S3: Pull the connecting plate 53 to translate on the surface of the flat plate 21 through the output end of the advancing and retreating cylinder 22, so that the bag-opening plate 54 is inserted into the packaging bag between the lower adsorption box 32 and the upper adsorption box 35;

[0055] S4: Then, the bag-opening motor 4 drives the ball screw 55 to rotate through the synchronous pulley, so that the ball screw 55 rotates self-driven under the limit of the limit block 51. After the ball screw 55 rotates, the two sliders 52 open and close outward, and the two bag-opening plates 54 push the packaging bag outward. The bag-opening action is completed. After the bagging action is completed, each part returns to its original position and waits for the next packaging bag.

[0056] The above is only a preferred embodiment of the present invention, so the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. An automatic plastic bag opening mechanism, characterized in that, It comprises a lifting motor (1), a transfer structure (2), an opening and closing mechanism (3) for opening a packaging bag, a bag-holding motor (4) and a moving mechanism (5), wherein the bag-holding motor (4) is arranged at the lower end of the moving mechanism (5), a transverse rod is arranged on the surface of the transfer structure (2), the lower end of the moving mechanism (5) moves horizontally on the transverse rod of the transfer structure (2), the opening and closing mechanism (3) is located on the right side of the moving mechanism (5), the moving mechanism (5) moves horizontally and is inserted into the middle of the opening and closing mechanism (3), and the lifting motor (1) is arranged at the lower end of the transfer structure (2) and drives the transfer structure (2) to move up and down; The moving mechanism (5) is provided with a limit block (51), a slider (52), a connecting plate (53), a bag support plate (54) and a ball screw (55); the bag support plate (54) is arranged on the upper surface of the slider (52); a synchronous wheel is arranged at the output end of the bag support motor (4); the bag support motor (4) drives the ball screw (55) to rotate through the synchronous wheel; the limit block (51) is fixed on the surface of the connecting plate (53); the ball screw (55) rotates in the middle of the limit block (51); two positive and negative nuts are arranged on the ball screw (55); the nuts are fixed in the two sliders (52); The transfer structure (2) is provided with a plane plate (21), an advance and retreat air cylinder (22), a sliding rod (23) and a fixed plate (24); the sliding rod (23) is arranged at the lower end of the plane plate (21); the fixed plate (24) is arranged at the lower end of the plane plate (21); the advance and retreat air cylinder (22) is fixed at the lower end of the plane plate (21); the output end of the advance and retreat air cylinder (22) is connected to the lower end of the connecting plate (53) to pull and translate; and the fixed plate (24) is provided with a threaded structure, which is engaged with the output end of the fixed lifting motor (1); The opening and closing mechanism (3) is provided with a force-bearing plate (31), a lower adsorption box (32), a pusher (33), a support rod (34) and an upper adsorption box (35); the side of the support rod (34) is provided with a force-bearing plate (31); the upper adsorption box (35) and the lower adsorption box (32) adsorb the packaging bag up and down to open; the pusher (33) is arranged at the lower end of the force-bearing plate (31), and the lower end of the force-bearing plate (31) is connected to the upper adsorption box (35); The bag support plate (54) is provided with an opening plate (541), a guide plate (542), a corner plate (543) and a vertical plate (544); the guide plate (542) is arranged at the upper end of the vertical plate (544); the opening plate (541) is arranged at the side of the vertical plate (544); the corner plate (543) is fixed to the upper end of the slide block (52); and the vertical plate (544) fixed to the side of the corner plate (543) is vertically above the slide block (52); The guiding plate (542) is provided with a pressing plate (5421), an inclined rod (5422), a sponge plate (5423), an expansion plate (5424), and a deformation plate (5425). The sponge plate (5423) is arranged inside the expansion plate (5424). Both ends of the inclined rod (5422) are fixed to the two side surfaces of the deformation plate (5425) and the expansion plate (5424), and the two inclined rods (5422) are symmetrically distributed up and down. The outer side of the deformation plate (5425) contacts and presses the packaging bag, causing the deformation plate (5425) to press the inclined rod (5422) and expand the two expansion plates (5424) outwards; The lower adsorption box (32) is provided with a hollow box (321), an adsorption plate (322), and a hollow tube (323). The adsorption plate (322) is arranged on the surface of the hollow box (321). The hollow tube (323) is communicated with the lower end inside the hollow box (321), and the hollow tube (323) adsorbs in a vacuum inside the hollow box (321), so that one side of the packaging bag on the surface of the adsorption plate (322) is adsorbed and opened; The adsorption plate (322) is provided with suction holes (3221), a blocking strip (3222), and a smooth plate (3223). There are three suction holes (3221), which are arranged equidistantly inside the smooth plate (3223). The adsorption force inside the hollow box (321) causes the suction holes (3221) to suck air inwards, and makes the packaging bag fit on the surface of the smooth plate (3223). The blocking strip (3222) is located at the upper right end of the suction holes (3221), and the blocking strip (3222) is fixed to the surface of the smooth plate (3223). When the packaging bag is adsorbed inwards at the position of the suction holes (3221), the blocking strip (3222) blocks the packaging bag and makes the packaging bag form an "L" - shaped bend.

2. A working method of an automatic plastic bag opening mechanism, which is applied to the automatic plastic bag opening mechanism described in claim 1, and is characterized in that, The working method includes the following specific steps: S1: After the packaging bag is manufactured, it is sent to the predetermined position of the lower adsorption box (32). Then, the electric signal controls the pusher (33) to push the force - receiving plate (31) downwards, driving the upper adsorption box (35) to abut against the corresponding lower adsorption box (32) position, and the lower adsorption box (32) and the upper adsorption box (35) simultaneously expand outwards and adsorb the packaging bag; S2: After the packaging bag is opened between the lower adsorption box (32) and the upper adsorption box (35), control the output end of the lifting motor (1) to drive the fixed plate (24) to lift and lower, so that the flat plate (21) horizontally lifts and lowers at the position of the sliding rod (23), and makes the bag - supporting plate (54) lift to the middle horizontal line between the corresponding lower adsorption box (32) and upper adsorption box (35); S3: Pull the connecting plate (53) to translate on the surface of the flat plate (21) through the output end of the advancing - retreating cylinder (22), so that the bag - supporting plate (54) is inserted into the packaging bag between the lower adsorption box (32) and the upper adsorption box (35); S4: Subsequently, the bag-supporting motor (4) drives the ball screw (55) to rotate through a synchronous pulley, causing the ball screw (55) to rotate self-driven under the limitation of the limiting block (51). After the ball screw (55) rotates, the two sliders (52) open and close outwards, and the two bag-supporting plates (54) push outwards to open the packaging bag, completing the bag-supporting action. After the bag-filling action is completed, each part returns to its original position, waiting for the next packaging bag.

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