Automatic plastic bag opening mechanism and working method thereof

Abstract

The invention relates to the technical field of automatic packaging, and discloses an automatic plastic bag opening mechanism and a working method thereof.The automatic plastic bag opening mechanism comprises a lifting motor, a transferring structure, an opening and closing mechanism, a bag opening motor and a moving mechanism; under the action force of opening, the middle of a deformation plate abuts against an inclined rod, so that an expansion plate is expanded in a splayed shape, the situation that the edge position of a plastic bag is prone to touching a packaging bag, so that the packaging bag is unstable during packaging is avoided, and the situation that the plastic bag is too thick during bagging and influences bagging is avoided; the packaging bag is opened on the surface of the arc-shaped smooth plate in an arc-shaped mode, the packaging bag moves towards the suction holes in an adsorption mode, the position where the packaging bag is adsorbed is bent in an L shape, the opening stability of the packaging bag is improved, and the situation that the packaging bag is easily pushed by inertia force generated when the plastic bag is pushed into the packaging bag is prevented. And the lower adsorption box and the packaging bag are prevented from sliding to influence the bagging stability.

Description

Technical Field

[0001] The invention relates to the technical field of automatic packaging, in particular to an automatic plastic bag opening mechanism and a working method thereof. Background Art

[0002] When plastic bags are produced, they need to be packaged. The automated bag-opening mechanism automatically opens the bags so that plastic bag products can be loaded into the bags more smoothly, significantly improving the packaging efficiency. The bag-opening plate opens the bag by moving left and right, but expands left and right when opening the packaging bag. The height when opened is low, and the upper and lower edges of the plastic bag are easy to touch the opening edges of the packaging bag. After touching, the plastic bag is easy to fold or even push the packaging bag out during the loading process, affecting the loading of thicker plastic bags. In addition, when the bag-opening plate is loaded, the plastic bag reaches the predetermined position. When the plastic bag is pushed into the bag, it is easy to push the packaging bag under inertia, which is easy to cause the bag-opening plate and the packaging bag to slide, affecting the stability of the bag loading. Summary of the invention

[0003] The present invention provides an automatic plastic bag opening mechanism and a working method thereof, which overcome the shortcomings described in the background technology.

[0004] The technical solution adopted by the present invention to solve its technical problem is: An automatic bag-opening mechanism for plastic bags comprises a lifting motor, a transfer structure, an opening and closing mechanism for opening a packaging bag, a bag-opening motor and a moving mechanism, wherein the bag-opening motor is arranged at the lower end of the moving mechanism, a transverse rod is arranged on the surface of the transfer structure, the lower end of the moving mechanism translates on the transverse rod of the transfer structure, the opening and closing mechanism is located on the right side of the moving mechanism, the moving mechanism translates and is inserted into the middle of the opening and closing mechanism, and the lifting motor is arranged at the lower end of the transfer structure and drives the transfer structure to move up and down; The moving mechanism is provided with a limit block, a slider, a connecting plate, a bag support plate and a ball screw. The bag support plate is arranged on the upper surface of the slider. The output end of the bag support motor is provided with a synchronous wheel. The bag support motor drives and drives the ball screw to rotate through the synchronous wheel. 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 positive and negative nuts are provided on the ball screw. The nuts are fixed in the two sliders. When the ball screw rotates, the nuts are driven to move left and right respectively. The transfer structure is provided with a plane plate, an advance and retreat cylinder, a sliding rod and a fixed plate, the sliding rod is arranged at the lower end of the plane plate, the fixed plate is arranged at the lower end of the plane plate, the advance and retreat cylinder is fixed at the lower end of the plane plate, the output end of the advance and retreat cylinder is connected to the lower end of the connecting plate to pull and translate, and the fixed plate is provided with a threaded structure, the threaded structure is engaged with the output end of the fixed lifting motor, and the lifting motor is engaged to drive the fixed plate to lift the plane plate; 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. A force-bearing plate is provided 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. The pusher is arranged at the lower end of the force-bearing plate, and the lower end of the force-bearing plate is connected to the upper adsorption box. The electric signal drives the pusher to push the force-bearing plate and the support rod to perform lifting activities, and the force-bearing plate drives the upper adsorption box to adsorb the packaging bag to open. After the packaging bag is opened, the advance and retreat cylinder drives the plane 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 open the packaging bag outward and elastically expand the packaging bag.

[0005] A better technical solution: the bag-supporting plate is provided with an opening plate, a guide plate, an angle plate and a vertical plate, the guide 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 to the upper end of the slider, and the vertical plate fixed on the side of the angle plate is vertically above the slider, the two sliders move in opposite directions on the ball screw and push the guide plate to open the packaging bag outward, and when the plastic bag is packed, it slides from the opening plate into the packaging bag opened by the guide plate.

[0006] A preferred technical solution: the guide plate is provided with a pressure plate, a tilting rod, a sponge plate, an expansion plate, and a deformation plate. The sponge plate is arranged on the inner side of the expansion plate. The two ends of the tilting rod are fixed on the sides of the deformation plate and the expansion plate, and the two tilting rods are symmetrically distributed up and down. The outer side of the deformation plate is in contact and squeezed with the packaging bag, so that the deformation plate presses the tilting rod and opens the two expansion plates outward.

[0007] A better 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 connected to the lower end of the hollow box, and the hollow tube is vacuum adsorbed in the hollow box, so that one side of the packaging bag on the surface of the adsorption plate is adsorbed and opened.

[0008] A better technical solution: the adsorption plate is provided with a suction hole, a blocking bar and a smooth plate. The suction holes are provided with three and are arranged equidistantly inside the smooth plate. The adsorption force in the hollow box causes the suction holes to absorb air inward and makes the packaging bag fit on the surface of the smooth plate. The blocking bar 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 inward at the suction hole position, the blocking bar blocks the packaging bag and makes the packaging bag form an "L" shape bend.

[0009] 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.

[0010] 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.

[0011] 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: 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; 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; 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; 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.

[0012] Compared with the prior art, this technical solution has the following advantages: 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.

[0013] In the present invention, when the lower adsorption box and the upper adsorption box adsorb the packaging bag, the packaging bag opens in an arc shape on the surface of the arc-shaped light slide plate, and the packaging bag is adsorbed toward the suction hole, so that the blocking bar is blocked at the edge of the suction hole, forming an "L"-shaped bend at the position where the packaging bag is adsorbed, thereby 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 sliding between the lower adsorption box and the packaging bag to affect the stability of bag filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 This is an overall diagram of the present invention.

[0016] Figure 2 It is a three-dimensional schematic diagram of the moving mechanism and the transfer structure.

[0017] Figure 3 It is a three-dimensional schematic diagram of the opening and closing mechanism.

[0018] Figure 4 It is a three-dimensional schematic diagram of the bag support board.

[0019] Figure 5 A side view of the guide plate.

[0020] Figure 6 It is a three-dimensional and side schematic diagram of the lower adsorption box.

[0021] Figure 7 This is an enlarged schematic diagram of local A of the adsorption plate.

[0022] In the figure: lifting motor-1, transfer structure-2, opening and closing mechanism-3, bag holding motor-4, moving mechanism-5.

[0023] Plane plate-21, advance and retreat cylinder-22, sliding rod-23, fixed plate-24, limit block-51, slider-52, connecting plate-53, bag support plate-54, ball screw-55.

[0024] Force-bearing plate-31, lower adsorption box-32, pusher-33, support rod-34, upper adsorption box-35.

[0025] Opening plate-541, guide plate-542, angle plate-543, vertical plate-544.

[0026] Pressure plate-5421, tilt rod-5422, sponge plate-5423, expansion plate-5424, deformation plate-5425.

[0027] Hollow box-321, adsorption plate-322, hollow tube-323, suction hole-3221, blocking strip-3222, smooth plate-3223. DETAILED DESCRIPTION

[0028] like Figures 1 to 7 As shown, the present invention proposes an automatic bag-opening mechanism for plastic bags, comprising a lifting motor 1, a transfer structure 2, an opening and closing mechanism 3 for opening the packaging bag, a bag-opening motor 4 and a moving mechanism 5, wherein the bag-opening 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 opening and closing 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 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. The output end of the bag support motor 4 is provided with a synchronous wheel. The bag support motor 4 drives and 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, and the ball screw 55 rotates in the middle of the limit block 51. Two positive and negative nuts are provided on the ball screw 55. The nuts are fixed in the two sliders 52. When the ball screw 55 rotates, the nuts are driven to move left and right respectively. The transfer structure 2 is provided with a plane plate 21, an advance and retreat cylinder 22, a sliding rod 23 and a fixed plate 24, wherein 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 cylinder 22 is fixed at the lower end of the plane plate 21, the output end of the advance and retreat cylinder 22 is connected to the lower end position of the connecting plate 53 to pull and translate, and the fixed plate 24 is provided with a threaded structure, the threaded structure is engaged with the output end of the fixed lifting motor 1, and the lifting motor 1 is engaged to drive the fixed plate 24 to lift and lower the plane plate 21; 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 it. 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 pusher 33 driven by an electric signal pushes the force-bearing plate 31 and the support rod 34 to perform lifting activities, and the force-bearing plate 31 drives the upper adsorption box 35 to adsorb the packaging bag to open it. After the packaging bag is opened, the advance and retreat cylinder 22 drives the plane 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 open the packaging bag outward and elastically expand the packaging bag.

[0029] Among them, the bag-supporting plate 54 is provided with an opening plate 541, a guide plate 542, an angle plate 543 and a vertical plate 544. The guide 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 angle plate 543 is fixed to the upper end of the slider 52, and the vertical plate 544 fixed on the side of the angle plate 543 is vertically above the slider 52. The two sliders 52 move in opposite directions on the ball screw 55 and push the guide plate 542 to open the packaging bag outward. When the plastic bag is packed, it slides from the opening plate 541 into the packaging bag opened by the guide plate 542.

[0030] Among them, the guide plate 542 is provided with a pressure plate 5421, a tilting rod 5422, a sponge plate 5423, an expansion plate 5424, and a deformation plate 5425. The sponge plate 5423 is arranged on the inner side of the expansion plate 5424, and the two ends of the tilting rod 5422 are fixed on the sides of the deformation plate 5425 and the expansion plate 5424, and the two tilting rods 5422 are symmetrically distributed up and down. The outer side of the deformation plate 5425 is in contact and squeezed with the packaging bag, so that the deformation plate 5425 presses the tilting rod 5422 and opens the two expansion plates 5424 outward.

[0031] Furthermore, the inwardly protruding shape of the expansion 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 confined in the middle position between the two expansion plates 5424, so that the plastic bag is farther away from the outer edge of the expansion plate 5424.

[0032] In the present invention, when the packaging bag is transferred to the surface of the lower adsorption box 32, the pusher 33 pushes the upper adsorption box 35 to move downward and abuts against the packaging bag on the surface of the lower adsorption box 32, so that the lower adsorption box 32 and the upper adsorption box 35 adsorb the packaging bag through the vacuum pump, and the packaging bag is opened when the lower adsorption box 32 and the upper adsorption box 35 move outward. Then, the bag-supporting plate 54 is inserted into the packaging bag under the lifting and lowering of the flat plate 21 by the lifting motor 1, the translation of the connecting plate 53 by the advance and retreat cylinder 22, and the rotation of the ball screw 55 by the bag-supporting motor 4, and the bag-supporting plate 54 is driven to open the packaging bag outward through the reverse movement of the slider 52. After the packaging bag is opened, the guide The deformation plate 5425 in the plate 542 is pressed against the inner side of the packaging bag. Under the force of the expansion, the middle of the deformation plate 5425 presses the tilted rod 5422, and the tilted rod 5422 presses the expansion plate 5424 outward, so that the expansion plate 5424 opens outward in an "eight" shape, and the outer side of the deformation plate 5425 increases the friction with the packaging bag. At this time, the expansion plate 5424 opens outward to increase the upper and lower widths of the packaging bag, so that the plastic bag slides from the middle of the trapezoidal structure of the expansion plate 5424 into the tilted rod 5422 during packaging, preventing the edge of the plastic bag from easily touching the packaging bag and causing instability during packaging, and avoiding the plastic bag being too thick when bagging.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 the vacuum pump, so that the suction hole 3221 generates an adsorption force inward to adsorb the packaging bag. At this time, the packaging bag opens in an arc shape on the surface of the arc-shaped light slide plate 3223, and the packaging bag is adsorbed and moved toward the suction hole 3221, so that the blocking bar 3222 is blocked at the edge of the suction hole 3221, forming an "L"-shaped bend at the position where the packaging bag is adsorbed, thereby increasing the stability of the opening of the packaging bag, preventing the inertia force generated when the plastic bag is pushed into the packaging bag from easily pushing the packaging bag, and avoiding sliding between the lower adsorption box 32 and the packaging bag to affect the stability of bagging.

[0039] 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: S1: When the packaging bag is finished, it is sent to the predetermined position of the lower adsorption box 32, so that the electric signal controls the pusher 33 to push the force plate 31 downward, driving the upper adsorption box 35 to the corresponding position of the lower adsorption box 32, and the lower adsorption box 32 and the upper adsorption box 35 are synchronously opened outward and adsorb the packaging bag; S2: After the packaging bag is opened between the lower adsorption box 32 and the upper adsorption box 35, the output end of the lifting motor 1 is controlled to drive the fixed plate 24 to lift, so that the flat plate 21 is lifted horizontally at the position of the sliding rod 23, so that the bag support plate 54 is lifted to the corresponding middle horizontal line between the lower adsorption box 32 and the upper adsorption box 35; S3: The connecting plate 53 is pulled to translate on the surface of the plane plate 21 through the output end of the advancing and retreating air cylinder 22, so that the bag support plate 54 is inserted into the packaging bag of the lower adsorption box 32 and the upper adsorption box 35; S4: Then the bag-holding motor 4 drives the ball screw 55 to rotate through the synchronous wheel, so that the ball screw 55 rotates 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-holding plates 54 open 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.

[0040] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A plastic bag automatic 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 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 vertically above the slider (52).

2. The automatic plastic bag opening mechanism according to claim 1, characterized in that: The guide plate (542) is provided with a pressing plate (5421), a tilting rod (5422), a sponge plate (5423), an expansion plate (5424), and a deformation plate (5425); the sponge plate (5423) is arranged on the inner side of the expansion plate (5424); the two ends of the tilting rod (5422) are fixed on the sides of the deformation plate (5425) and the expansion plate (5424); the two tilting rods (5422) are symmetrically distributed up and down; the outer side of the deformation plate (5425) contacts and squeezes the packaging bag, so that the deformation plate (5425) presses the tilting rod (5422) and opens the two expansion plates (5424) outward.

3. The automatic plastic bag opening mechanism according to claim 2, characterized in that: 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.

4. The automatic plastic bag opening mechanism according to claim 3, characterized in that: 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 holes, which are arranged equidistantly inside the smooth plate (3223). The adsorption force inside the hollow box (321) causes the suction holes (3221) to absorb air inwards and causes the packaging bag to 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 is fixed on the surface of the smooth plate (3223). When the packaging bag is adsorbed inwards at the suction hole (3221), the blocking bar (3222) blocks the packaging bag and causes the packaging bag to bend in an "L" shape.

5. A working method of an automatic bag-opening mechanism for plastic bags, applied to the automatic bag-opening mechanism for plastic bags according to claim 4, characterized in that: The working method includes the following specific steps: S1: When the packaging bag is completed, it is sent to the predetermined position of the lower adsorption box (32), so that the electric signal controls the pusher (33) to push the force plate (31) downward, driving the upper adsorption box (35) to abut against the corresponding position of the lower adsorption box (32), and the lower adsorption box (32) and the upper adsorption box (35) are synchronously opened outward and adsorb the packaging bag; S2: After the packaging bag is opened between the lower adsorption box (32) and the upper adsorption box (35), the output end of the lifting motor (1) is controlled to drive the fixed plate (24) to lift and lower, so that the flat plate (21) is lifted and lowered horizontally at the position of the sliding rod (23), so that the bag support plate (54) is lifted and lowered to the corresponding middle horizontal line between the lower adsorption box (32) and the upper adsorption box (35); S3: Pulling the connecting plate (53) to translate on the surface of the plane plate (21) through the output end of the advancing and retreating air cylinder (22), so that the bag support plate (54) is inserted into the packaging bags of the lower adsorption box (32) and the upper adsorption box (35); S4: Then the bag-holding motor (4) drives the ball screw (55) to rotate via the synchronous wheel, so that the ball screw (55) rotates 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-holding plates (54) open the packaging bag outward. The bag-holding action is completed. After the bag-loading action is completed, each part returns to its original position and waits for the next packaging bag.

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