Automatic feeding device for degradable plastic bag production

Abstract

The invention relates to the technical field of plastic bag production, in particular to an automatic feeding device for degradable plastic bag production, which comprises a rack, a material hanging roller, a guide roller, a clamping conveying roller, a cutting unit and a material supporting unit, the material supporting unit comprises a supporting plate horizontally arranged below the cutting unit, and movable bases are respectively arranged on two sides of the supporting plate; a conveying belt is arranged on the movable bases, a plurality of installation plates are installed on the working face of the conveying belt at equal intervals, suction nozzles are installed on the installation plates in a sliding mode, and a negative pressure generation assembly is arranged in the center of the lower portion of the supporting plate and communicates with the suction nozzles above the movable bases. According to the technical scheme, the edge of the plastic bag is sucked through the suction nozzle to pull the plastic bag to move, the suction nozzle moving to the position below the cutting unit moves in the direction away from the negative pressure generation assembly to transversely stretch the plastic bag, the plastic bag is expanded in a regular and uniform mode, and the cutting unit can accurately cut the plastic bag.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bag production, and in particular to an automatic feeding device for producing degradable plastic bags. Background Art

[0002] Degradable plastic bags are bags made of plastic as the main raw material and are indispensable items in people's daily lives. When producing plastic bags, the rolled plastic is usually straightened, and the straightened plastic bags are hot-pressed and cut into shape. Due to the directional conveying of plastic bags, the plastic bags are only straightened in the conveying direction, and it is impossible to ensure that the plastic bags are fully opened on both sides of the moving direction to ensure the flat laying effect. Once the plastic bag has wrinkles, or is not opened regularly and evenly, the cutting effect of the cutting unit cannot be guaranteed. Summary of the invention

[0003] In view of the above problems, it is necessary to provide an automatic feeding device for the production of degradable plastic bags to address the problems of the prior art.

[0004] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: An automatic feeding device for producing degradable plastic bags comprises a frame, and a hanging roller, a guide roller, a clamping conveying roller and a cutting unit installed on the frame. The frame is provided with a supporting unit below the cutting unit. The supporting unit comprises a supporting plate horizontally arranged below the cutting unit. A movable base is respectively arranged on both sides of the supporting plate. A conveyor belt is arranged on the movable base. A plurality of mounting plates are evenly installed on the working surface of the conveyor belt. The conveyor belt drives the mounting plate to move along the conveying direction of the plastic bag. The mounting plate extends in a horizontal direction perpendicular to the movement of the plastic bag. A suction nozzle is slidably installed on the mounting plate, and the suction nozzle absorbs the side of the plastic bag. A negative pressure generating assembly is arranged at the center position below the supporting plate. The negative pressure generating assembly is connected to each suction nozzle located above the movable base. The suction nozzle moved to below the cutting unit moves in a direction away from the negative pressure generating assembly to stretch the plastic bag laterally.

[0005] Preferably, the negative pressure generating assembly includes an air box arranged between two movable bases, the bottom of the air box is connected to the working end of the vacuum generator, and the vacuum generator is fixedly installed on the frame; the air box is slidably installed with side panels towards both ends of the movable base, the side panels are provided with waist-shaped ring grooves, and the same number of movable blocks as the mounting plates are slidably installed in the waist-shaped ring grooves, and the movable blocks are provided with air holes, and the movable blocks are provided with plug-in sleeves which are in the same straight line as the air holes on the side of the movable base facing the movable base, and the plug-in sleeves are respectively connected with suction nozzles, and the suction nozzles drive the movable blocks to move in the waist-shaped ring grooves; the upper side of the waist-shaped ring grooves is provided with horizontal through holes extending horizontally along the moving path of the air holes, and the movable block moved to the horizontal through holes is connected to the suction nozzle and the air box through the air holes and the plug-in sleeves.

[0006] Preferably, the width of the horizontal through hole is smaller than the width of the waist-shaped ring groove, and the moving blocks located on the upper side of the waist-shaped ring groove fit together to seal the horizontal through hole.

[0007] Preferably, the mounting plate is provided with a slide groove extending along the length direction of the mounting plate, a movable plate is slidably installed in the slide groove, the suction nozzle is arranged at the top end of the air box, and the air box is installed on the movable plate; a right-angle air pipe is arranged on the movable plate, the top end of the right-angle air pipe is vertically inserted into the bottom of the air box, and the bottom end of the right-angle air pipe is horizontally connected to the plug-in sleeve on the movable block.

[0008] Preferably, an insertion rod extending along the length direction of the mounting plate is provided at one end of the movable plate away from the negative pressure generating component, the insertion rod is inserted in an insertion plate set on the mounting plate, a first spring is sleeved on the insertion rod, the first spring elastically connects the movable plate and the insertion plate, the elastic force of the first spring causes the movable plate to move toward one side of the negative pressure generating component and fit into the slide groove near a positioning block set at one end of the negative pressure generating component; limited top plates are fixedly installed on both sides of the air box, the limited top plates are located below the support plate and extend along the moving direction of the suction nozzle, a raised surface is provided at the position of the limited top plate below the cutting unit, and the spacing between the raised surfaces on both sides is greater than the spacing between the limited top plates on both sides; a horizontal head cylinder is provided at one end of the air box facing the negative pressure generating component, and when the movable plate fits into the positioning block, the head cylinder fits into the surface of the limited top plate.

[0009] Preferably, the mounting plate is provided with an avoidance hole, the right-angle air pipe passes through the avoidance hole and extends to below the mounting plate, and the avoidance hole extends along the length direction of the mounting plate.

[0010] Preferably, both ends of the transmission belt are sleeved on a transmission wheel, a spline hole is provided at the axis of the transmission wheel, the transmission wheel is spline-connected with two spline shafts rotatably installed on the frame through the spline hole, and a rotating driver for driving the spline shafts to rotate is provided on the frame; a fixed plate is provided on the side of the transmission belt away from the negative pressure generating component on the movable base, a linear driver with a horizontally arranged working end is provided on the frame, and the working end of the linear driver is fixedly connected to the fixed plate.

[0011] Preferably, the side panels are provided with horizontally extending shells on the upper and lower sides inside the air box, and locking bolts are spirally installed on the bottom of the air box, and the locking bolts are used to lock the positions of the side panels at both ends of the negative pressure generating assembly.

[0012] Preferably, a vertically extending guide rod is provided at the bottom of the air box, and the guide rod is inserted in a guide sleeve provided on the movable plate; a limit rod extending horizontally toward the fixed plate is provided on the outside of the air box, and the limit rod is inserted in a limit ring groove provided on the fixed plate toward the side of the conveyor belt; the limit rod moved to the limit ring groove drives the suction nozzle to move up to a height flush with the upper surface of the support plate, and the limit ring groove is provided with a sinking section at the output end of the conveyor belt.

[0013] Preferably, the limiting rod is composed of a coaxially arranged sleeve and a sleeve rod, the sleeve rod is inserted in the sleeve, a second spring is arranged in the sleeve, and the elastic force of the second spring pushes the sleeve rod to be inserted in the limiting ring groove; the inner width of the limiting ring groove and the sinking section is the same as the diameter of the sleeve rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First, the conveyor belt in the present invention can drive the mounting plate to move along the conveying direction of the plastic bag, and the suction nozzle slidably mounted on the mounting plate can absorb the side of the plastic bag. When the suction nozzle moves to the bottom of the cutting unit, it moves away from the negative pressure generating component, thereby stretching the plastic bag horizontally, realizing the material expansion operation, and can make the plastic bag expand more regularly and evenly, so that the cutting unit can accurately cut the plastic bag, ensure the accuracy of the cutting size, meet the product specification requirements, and ensure the consistency of the overall product quality.

[0015] Secondly, the negative pressure generating assembly of the present invention accurately controls the timing and position of the negative pressure connection between the suction nozzle and the air box through the design of the waist-shaped ring groove, the moving block and the horizontal through hole. The negative pressure connection is established only when the moving block moves to a specific horizontal through hole position, ensuring that only the upward suction nozzle has the adsorption capacity, avoiding the waste of negative pressure and misoperation when the plastic bag is not needed to be adsorbed, and improving the accuracy and stability of the negative pressure control of the entire device.

[0016] Thirdly, when the limiting rod in the present invention moves on the upper side of the limiting ring groove, the suction nozzle moves up to a height flush with the upper surface of the support plate, thereby ensuring that the plastic bag is flat when the plastic bag is adsorbed; when the limiting rod moves to the sinking section, it will move downward along the sinking section. At this time, the suction nozzle can move down and leave the lower surface of the plastic bag, thereby avoiding contact with the plastic bag during the subsequent flipping of the suction nozzle, affecting the subsequent movement trajectory of the plastic bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional automatic feeding device for the production of degradable plastic bags. Figure 1 ; Figure 2 It is a three-dimensional automatic feeding device for the production of degradable plastic bags. Figure 2 ; Figure 3 yes Figure 2 A local enlarged view of point A; Figure 4 yes Figure 3 A partial enlarged view of point B; Figure 5 It is a side view of an automatic feeding device for the production of degradable plastic bags; Figure 6 yes Figure 5 A cross-sectional view of the section at CC; Figure 7 yes Figure 6 A partial enlarged view of point D; Figure 8 A three-dimensional decomposition of the support plate, mobile base and negative pressure generating components of an automatic feeding device for the production of degradable plastic bags Figure 1 ; Fig. 9 yes Figure 8 A local enlarged view of point E; Fig.10 A three-dimensional decomposition of the support plate, mobile base and negative pressure generating components of an automatic feeding device for the production of degradable plastic bags Figure 2 .

[0018] The numbers in the figure are: 1, frame; 11, hanging roller; 12, guide roller; 13, clamping conveyor roller; 14, cutting unit; 2, supporting unit; 21, supporting plate; 22, moving base; 221, conveyor belt; 222, driving wheel; 223, spline hole; 224, spline shaft; 225, rotary drive; 226, fixed plate; 227, linear drive; 228, limit ring groove; 229, sinking section; 23, mounting plate; 231, slide groove; 232, moving plate; 233, right-angle air pipe; 234, plug rod; 235, plug-in plate; 236, The first spring; 237, positioning block; 238, avoidance hole; 239, guide sleeve; 24, suction nozzle; 241, air box; 243, head cylinder; 244, guide rod; 245, limit rod; 246, sleeve; 247, sleeve rod; 248, second spring; 25, negative pressure generating assembly; 251, air box; 252, vacuum generator; 253, side panel; 254, waist-shaped ring groove; 255, moving block; 256, air hole; 257, plug-in sleeve; 258, horizontal through hole; 259, locking bolt; 26, limit top plate; 261, raised surface. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Reference Figures 1 to 10 : An automatic feeding device for producing degradable plastic bags, comprising a frame 1, and a hanging roller 11, a guide roller 12, a clamping conveying roller 13 and a cutting unit 14 installed on the frame 1, the frame 1 is provided with a supporting unit 2 below the cutting unit 14, the supporting unit 2 comprises a support plate 21 horizontally arranged below the cutting unit 14, and two sides of the support plate 21 are respectively provided with a movable base 22 (such as Figure 5As shown), a conveyor belt 221 is arranged on the mobile base 22, and a plurality of mounting plates 23 are installed at equal intervals on the working surface of the conveyor belt 221. The conveyor belt 221 drives the mounting plate 23 to move along the conveying direction of the plastic bag. The mounting plate 23 extends in a horizontal direction perpendicular to the movement of the plastic bag. A suction nozzle 24 is slidably installed on the mounting plate 23, and the suction nozzle 24 absorbs the side of the plastic bag; a negative pressure generating component 25 is arranged at the center position below the support plate 21, and the negative pressure generating component 25 is connected to each suction nozzle 24 located above the mobile base 22. The suction nozzle 24 moved to the bottom of the cutting unit 14 moves in a direction away from the negative pressure generating component 25 to stretch the plastic bag laterally.

[0021] The present application places the plastic bag roll by the hanging roller 11, and the guide roller 12 and the clamping conveying roller 13 guide and convey the plastic bag in an orderly manner, so that it can move toward the cutting unit 14 along the established route, completing the preliminary material transmission preparation work. The cutting unit 14 can cut the plastic bags that are conveyed, and cut the continuous plastic bag materials into corresponding lengths or specifications as required, so as to facilitate subsequent processing and use. The conveyor belt 221 on the mobile base 22 in the support unit 2 can drive the mounting plate 23 to move along the plastic bag conveying direction, and the suction nozzle 24 slidably mounted on the mounting plate 23 can adsorb the side of the plastic bag. And the negative pressure generating assembly 25 arranged at the center position below the support plate 21 can be connected to each suction nozzle 24 located above the mobile base 22, so that the suction nozzle 24 has adsorption capacity. When the suction nozzle 24 moves to the bottom of the cutting unit 14, it moves in the direction away from the negative pressure generating assembly 25, thereby stretching the plastic bag laterally and realizing the material expansion operation, which can make the plastic bag expand more regularly and evenly, so that the cutting unit 14 can accurately cut the plastic bag, ensure the accuracy of the cutting size, meet the product specification requirements and ensure the consistency of the overall product quality.

[0022] In order to solve the problem of how to make the moving suction nozzle 24 have adsorption ability, the following features are specifically set: The negative pressure generating assembly 25 includes an air box 251 disposed between the two movable bases 22, and the bottom of the air box 251 is connected to the working end of the vacuum generator 252 (such as Figure 5 As shown), the vacuum generator 252 is fixedly mounted on the frame 1; the air box 251 is slidably mounted with side panels 253 at both ends of the mobile base 22, and the side panels 253 are provided with waist-shaped annular grooves 254 (such as Figure 8As shown in the figure, the waist-shaped annular groove 254 is slidably installed with moving blocks 255 of the same number as the mounting plate 23, and the moving blocks 255 are provided with air holes 256. The moving blocks 255 are provided with insert sleeves 257 on the same straight line as the air holes 256 on the side facing the moving base 22, and the insert sleeves 257 are respectively connected to the suction nozzles 24, and the suction nozzles 24 drive the moving blocks 255 to move in the waist-shaped annular groove 254; the upper side of the waist-shaped annular groove 254 is provided with horizontal through holes 258 extending horizontally along the moving path of the air holes 256, and the moving blocks 255 move to the horizontal through holes 258 (as shown in the figure). Fig.10 The moving block 255 at the position shown in the figure connects the suction nozzle 24 and the air box 251 through the air hole 256 and the insert sleeve 257.

[0023] The width of the horizontal through hole 258 is smaller than the width of the waist-shaped ring groove 254 , and the moving blocks 255 located on the upper side of the waist-shaped ring groove 254 fit together to block the horizontal through hole 258 .

[0024] The vacuum generator 252 in this embodiment serves as a power source for generating negative pressure, and its working end is connected to the bottom of the air box 251. When the vacuum generator 252 is started, it will extract the air in the air box 251, so that a negative pressure environment is formed inside the air box 251. The side panels 253 at both ends of the air box 251 are slidably mounted on the air box 251, and the waist-shaped ring groove 254 on the side panel 253 provides a specific moving track for the moving block 255. The moving block 255 moves in the waist-shaped ring groove 254 as the mounting plate 23 and the suction nozzle 24 move. When the moving block 255 moves to the position of the horizontal through hole 258, the air hole 256 is aligned with the horizontal through hole 258, and the negative pressure in the air box 251 is transmitted to the suction nozzle 24 through the horizontal through hole 258, the air hole 256 and the plug-in sleeve 257, so that the suction nozzle 24 can adsorb the side of the plastic bag, realizing the coordination of the grabbing and supporting actions of the plastic bag. This embodiment accurately controls the timing and position of the negative pressure connection between the suction nozzle 24 and the air box 251 through the design of the waist-shaped ring groove 254, the moving block 255 and the horizontal through hole 258. The negative pressure connection is established only when the moving block 255 moves to the position of the horizontal through hole 258, ensuring that only the upward suction nozzle 24 has the suction capacity, avoiding the waste of negative pressure and misoperation when the plastic bag does not need to be sucked, and improving the accuracy and stability of the negative pressure control of the entire device.

[0025] In order to solve the problem of how to automatically support the plastic bag when the suction nozzle 24 moves to the bottom of the cutting unit 14, the following features are specifically set: The mounting plate 23 is provided with a slide groove 231 (such as Figure 3 As shown, a movable plate 232 is slidably installed in the slide groove 231, the suction nozzle 24 is arranged at the top of the air box 241, and the air box 241 is installed on the movable plate 232; a right-angle air pipe 233 (as shown in FIG. 24 ) is arranged on the movable plate 232 Fig. 9As shown), the top end of the right-angle air pipe 233 is vertically inserted into the bottom of the air box 241, and the bottom end of the right-angle air pipe 233 is horizontally connected to the insertion sleeve 257 on the moving block 255.

[0026] The end of the movable plate 232 away from the negative pressure generating assembly 25 is provided with an insertion rod 234 (such as Figure 3 As shown in the figure, the plug rod 234 is inserted into the plug-in plate 235 provided on the mounting plate 23, and a first spring 236 is sleeved on the plug-in rod 234. The first spring 236 elastically connects the moving plate 232 and the plug-in plate 235. The elastic force of the first spring 236 causes the moving plate 232 to move toward the side of the negative pressure generating component 25 and fit the positioning block 237 provided at one end of the slide groove 231 close to the negative pressure generating component 25; the limited top plates 26 (as shown in the figure) are fixedly installed on both sides of the air box 251 Fig.10 As shown, the limiting top plate 26 is located below the support plate 21 and extends along the moving direction of the suction nozzle 24. The limiting top plate 26 is provided with a convex surface 261 at a position below the cutting unit 14. The convex surfaces 261 on both sides (as shown in FIG. Fig.10 The spacing between the two sides of the limiting top plate 26 is greater than the distance between the two side limiting top plates 26; a horizontal top cylinder 243 is provided at one end of the air box 241 facing the negative pressure generating component 25, and when the movable plate 232 is in contact with the positioning block 237, the top cylinder 243 is in contact with the surface of the limiting top plate 26.

[0027] The chute 231 on the mounting plate 23 in this embodiment allows the movable plate 232 to slide along its length direction, thereby realizing the position adjustment of the suction nozzle 24 within a certain range. The first spring 236 is set to provide the movable plate 232 with elastic force toward one side of the negative pressure generating assembly 25, so that the movable plate 232 can fit the positioning block 237 at one end of the chute 231 close to the negative pressure generating assembly 25 under normal conditions. In this state, the top cylinder 243 on the air box 241 moving to the upper side of the conveyor belt 221 fits the limiting top plate 26 to ensure the relative stability of the suction nozzle 24 in the initial position; when the suction nozzle 24 moves to a specific position below the cutting unit 14 with the movable plate 232, the limiting top plates 26 and their raised surfaces 261 on both sides of the air box 251 begin to play a role. Since the distance between the raised surfaces 261 on both sides is greater than the distance between the limiting top plates 26 on both sides, the top cylinder 243 at one end of the air box 241 facing the negative pressure generating assembly 25 will contact with the raised surface 261 and be squeezed, forcing the movable plate 232 to overcome the elastic force of the first spring 236 and move in the direction away from the negative pressure generating assembly 25, thereby driving the suction nozzle 24 to stretch the plastic bag laterally to achieve the material-supporting action. This embodiment can accurately control the degree of lateral stretching of the plastic bag by the suction nozzle 24 through the cooperation of the limiting top plate 26 and the top cylinder 243 and the design of the movable plate 232 and the first spring 236. The material-supporting action will only be triggered when the suction nozzle 24 moves to a suitable position below the cutting unit 14, avoiding damage to the plastic bag caused by premature or excessive stretching, ensuring the integrity and quality stability of the plastic bag during the material-supporting process, and facilitating the smooth progress of subsequent processing steps. In this embodiment, the top end of the right-angle air pipe 233 is vertically inserted into the bottom of the air box 241, and the bottom end is horizontally connected to the plug-in sleeve 257 on the moving block 255, ensuring that the negative pressure generated by the air box 251 can be stably transmitted to the suction nozzle 24, and during the movement of the moving plate 232, the right-angle air pipe 233 can adapt to its position change and maintain the connectivity and sealing of the air path.

[0028] In order to ensure smooth movement of the right-angle air pipe 233, the following features are specifically set: The mounting plate 23 is provided with a relief hole 238 (such as Figure 8 As shown in the figure), the right-angle air pipe 233 extends to the bottom of the mounting plate 23 through the avoidance hole 238, and the avoidance hole 238 extends along the length direction of the mounting plate 23.

[0029] In the present embodiment, during the movement of the movable plate 232 , the right-angle air pipe 233 moves in the avoidance hole 238 in the mounting plate 23 to avoid affecting the movement of the movable plate 232 .

[0030] In order to solve the problem of how to realize the operation of the conveyor belt 221, the following features are specifically set: The two ends of the transmission belt 221 are sleeved on the transmission wheel 222 (such as Figure 7As shown, a spline hole 223 is provided at the axis of the transmission wheel 222 (as shown Figure 7 and Fig.10 As shown, the transmission wheel 222 is spline-connected with two spline shafts 224 rotatably mounted on the frame 1 through a spline hole 223, and a rotation driver 225 (as shown in FIG. Figure 1 and Figure 2 As shown); a fixed plate 226 is provided on the side of the conveyor belt 221 away from the negative pressure generating component 25, and a linear drive 227 with a horizontal working end is provided on the frame 1, and the working end of the linear drive 227 is fixedly connected to the fixed plate 226.

[0031] The rotary driver 225 is started, driving the spline shaft 224 to rotate. Since the transmission wheel 222 is spline-connected with the spline shaft 224 through the spline hole 223, the spline connection can not only transmit a large torque, but also ensure the relative axial movement freedom of the transmission wheel 222 and the spline shaft 224 to a certain extent. The rotation of the spline shaft 224 drives the transmission wheel 222 to rotate, and the transmission belt 221 sleeved on the transmission wheel 222 starts to run, realizing the stable movement of the mounting plate 23 and the suction nozzle 24 in a specific direction to complete the related operations such as adsorption, conveying and stretching of the plastic bag. The rotary driver 225 in this embodiment can be a servo motor. When the linear driver 227 is working, its working end pushes the fixed plate 226, because the fixed plate 226 is connected to the mobile base 22, so the mobile base 22 as a whole will move in the horizontal direction. This movement can adjust the position of the mobile base 22 and the components such as the transmission belt 221 and the suction nozzle 24 thereon relative to the frame 1 according to production requirements, so as to process plastic bags of different sizes. The linear drive 227 in this embodiment can be a cylinder or an electric push rod, etc.

[0032] In order to coordinate the position adjustment of the suction nozzle 24 and the right-angle air pipe 233, the following features are specifically provided: The side panels 253 are located at the upper and lower sides of the air box 251 and are provided with a horizontally extending shell. The bottom of the air box 251 is spirally installed with locking bolts 259, which are used to lock the position of the side panels 253 at both ends of the negative pressure generating assembly 25.

[0033] The side panel 253 in this embodiment moves horizontally along the end of the air box 251. Since the side panel 253 is provided with horizontally extending shells on the upper and lower sides inside the air box 251, it can stably slide at the end of the air box 251 and make corresponding adjustments according to the positions of the suction nozzle 24 and the right-angle air pipe 233. After the side panel 253 moves to a suitable position, the locking bolt 259 is tightened to make it tightly against the side panel 253, thereby fixing the side panel 253 at the current position.

[0034] In order to prevent the suction nozzle 24 from affecting the movement trajectory of the cut plastic bag when it turns over at the output end of the conveyor belt 221, the following features are specifically set: A vertically extending guide rod 244 is provided at the bottom of the air box 241, and the guide rod 244 is inserted into a guide sleeve 239 provided on the movable plate 232; a limit rod 245 is provided on the outside of the air box 241 and horizontally extends toward the fixed plate 226. The limit rod 245 (such as Figure 4 The suction nozzle 24 is moved upward to a height flush with the upper surface of the support plate 21, and the limiting ring groove 228 is provided with a sinking section 229 at the position of the limiting ring groove 228 at the output end of the conveyor belt 221. The limiting ring groove 228 is provided with a sinking section 229 starting from the side of the horizontal through hole 258 close to the output end of the conveyor belt 221.

[0035] The conveyor belt 221 in this embodiment is in continuous operation and drives the mounting plate 23 and the gas box 241 and other components mounted thereon to move together. When the limit rod 245 moves on the upper side of the limit ring groove 228, the suction nozzle 24 moves up to a height flush with the upper surface of the support plate 21, thereby ensuring that the plastic bag is flat when adsorbing the plastic bag; since the limit ring groove 228 is provided with a sinking section 229 at the output end of the conveyor belt 221, when the limit rod 245 moves to the sinking section 229, a relative displacement change will begin to occur along the trajectory of the sinking section 229, and this displacement change will be transmitted to the gas box 241 through the limit rod 245, so that the gas box 241 begins to move downward, and at this time the suction nozzle 24 can move downward to separate from the lower surface of the plastic bag, thereby avoiding contact with the plastic bag during the subsequent flipping of the suction nozzle 24, affecting the subsequent movement trajectory of the plastic bag. When the air box 241 moves up and down, the guide rod 244 at the bottom thereof slides along the guide sleeve 239 on the movable plate 232, thereby providing a stable guiding effect for the movement of the air box 241 and ensuring that the air box 241 can move upward smoothly.

[0036] In order to ensure that the limiting rod 245 can still move in the limiting ring groove 228 when the air box 241 moves along the slide groove 231, the following features are specifically provided: The limiting rod 245 is composed of a coaxially arranged sleeve 246 and a sleeve rod 247. The sleeve rod 247 is inserted in the sleeve 246. A second spring 248 is arranged in the sleeve 246. The elastic force of the second spring 248 pushes the sleeve rod 247 to be inserted in the limiting ring groove 228; the inner width of the limiting ring groove 228 and the sinking section 229 is the same as the diameter of the sleeve rod 247.

[0037] In this embodiment, when the top cylinder 243 on the air box 241 contacts the raised surface 261 of the limiting top plate 26, the air box 241 needs to move along the slide groove 231. At this time, the distance between the air box 241 and the limiting ring groove 228 is shortened. Since the limiting rod 245 is composed of a coaxially arranged sleeve 246 and a sleeve rod 247, the length of the limiting rod 245 can be changed accordingly. The elastic force of the second spring 248 ensures that the sleeve rod 247 is always inserted in the limiting ring groove 228.

[0038] Working principle: When in use, the plastic bag is stably conveyed to the cutting unit 14 through the hanging roller 11, the guide roller 12 and the clamping conveying roller 13. In the supporting unit 2, the vacuum generator 252 of the negative pressure generating assembly 25 works to generate negative pressure in the air box 251. The moving blocks 255 on the side panels 253 at both ends of the air box 251 are connected to the suction nozzle 24 on the mounting plate 23 through the plug-in sleeve 257, the right-angle air pipe 233 and other air paths. When the suction nozzle 24 moves to the top of the conveyor belt 221, the suction nozzle 24 moves to the position connected with the horizontal through hole 258 of the air box 251, the suction nozzle 24 generates suction force and absorbs the side of the plastic bag to move. When the suction nozzle 24 moves to the bottom of the cutting unit 14, it moves in the direction away from the negative pressure generating assembly 25, stretches the plastic bag horizontally, and evenly expands the plastic bag horizontally to maintain tension. The cutting unit 14 cuts the plastic bag, and the cut plastic bag falls on the supporting plate 21 for subsequent stacking and material transfer.

[0039] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An automatic feeding device for producing degradable plastic bags, comprising a frame (1), and a material hanging roller (11), a guide roller (12), a clamping conveying roller (13) and a cutting unit (14) mounted on the frame (1), wherein the frame (1) is provided with a material supporting unit (2) below the cutting unit (14), characterized in that: The material supporting unit (2) comprises a supporting plate (21) horizontally arranged below the cutting unit (14), a movable base (22) being arranged on both sides of the supporting plate (21), a conveyor belt (221) being arranged on the movable base (22), a plurality of mounting plates (23) being evenly spaced and mounted on the working surface of the conveyor belt (221), the conveyor belt (221) driving the mounting plate (23) to move along the conveying direction of the plastic bag, the mounting plate (23) extending in a horizontal direction perpendicular to the movement of the plastic bag, a suction nozzle (24) being slidably mounted on the mounting plate (23), the suction nozzle (24) sucking the side edge of the plastic bag; A negative pressure generating assembly (25) is provided at the center position below the support plate (21), and the negative pressure generating assembly (25) is connected to each suction nozzle (24) located above the movable base (22). The suction nozzle (24) moved below the cutting unit (14) moves in a direction away from the negative pressure generating assembly (25) to stretch the plastic bag laterally.

2. The automatic feeding device for producing degradable plastic bags according to claim 1, characterized in that: The negative pressure generating assembly (25) comprises an air box (251) arranged between two movable bases (22); the bottom of the air box (251) is connected to the working end of a vacuum generator (252); and the vacuum generator (252) is fixedly mounted on the frame (1); Side panels (253) are slidably mounted on both ends of the air box (251) toward the movable base (22); waist-shaped annular grooves (254) are provided on the side panels (253); the same number of movable blocks (255) as the mounting plate (23) are slidably mounted in the waist-shaped annular grooves (254); air holes (256) are provided on the movable blocks (255); a plug-in sleeve (257) which is in the same straight line as the air holes (256) is provided on one side of the movable block (255) toward the movable base (22); the plug-in sleeve (257) is respectively connected to the suction nozzle (24); the suction nozzle (24) drives the movable block (255) to move in the waist-shaped annular groove (254); A horizontal through hole (258) extending horizontally along the moving path of the air hole (256) is provided on the upper side of the waist-shaped annular groove (254); the moving block (255) moved to the horizontal through hole (258) is connected to the suction nozzle (24) and the air box (251) through the air hole (256) and the insert sleeve (257).

3. The automatic feeding device for producing degradable plastic bags according to claim 2, characterized in that: The width of the horizontal through hole (258) is smaller than the width of the waist-shaped annular groove (254), and the moving blocks (255) located on the upper side of the waist-shaped annular groove (254) fit together to seal the horizontal through hole (258).

4. The automatic feeding device for producing degradable plastic bags according to claim 3, characterized in that: The mounting plate (23) is provided with a slide groove (231) extending along the length direction of the mounting plate (23), a movable plate (232) is slidably mounted in the slide groove (231), the suction nozzle (24) is arranged at the top end of the air box (241), and the air box (241) is mounted on the movable plate (232); A right-angle air pipe (233) is provided on the movable plate (232), the top end of the right-angle air pipe (233) is vertically inserted into the bottom of the air box (241), and the bottom end of the right-angle air pipe (233) is horizontally connected to the insertion sleeve (257) on the movable block (255).

5. The automatic feeding device for producing degradable plastic bags according to claim 4, characterized in that: An insertion rod (234) extending along the length direction of the mounting plate (23) is provided at one end of the movable plate (232) away from the negative pressure generating assembly (25); the insertion rod (234) is inserted into an insertion plate (235) provided on the mounting plate (23); a first spring (236) is sleeved on the insertion rod (234); the first spring (236) elastically connects the movable plate (232) and the insertion plate (235); the elastic force of the first spring (236) causes the movable plate (232) to move toward the side of the negative pressure generating assembly (25) and to fit into a positioning block (237) provided at one end of the slide groove (231) close to the negative pressure generating assembly (25); Limiting top plates (26) are fixedly mounted on both sides of the air box (251); the limiting top plates (26) are located below the support plate (21) and extend along the moving direction of the suction nozzle (24); a convex surface (261) is provided at a portion of the limiting top plates (26) located below the cutting unit (14); and a distance between the convex surfaces (261) on both sides is greater than a distance between the limiting top plates (26) on both sides; A horizontal top cylinder (243) is provided at one end of the air box (241) facing the negative pressure generating assembly (25); when the movable plate (232) is in contact with the positioning block (237), the top cylinder (243) is in contact with the surface of the limiting top plate (26).

6. The automatic feeding device for producing degradable plastic bags according to claim 5, characterized in that: The mounting plate (23) is provided with an avoidance hole (238), the right-angle air pipe (233) passes through the avoidance hole (238) and extends to the bottom of the mounting plate (23), and the avoidance hole (238) extends along the length direction of the mounting plate (23).

7. The automatic feeding device for producing degradable plastic bags according to claim 1, characterized in that: Both ends of the transmission belt (221) are sleeved on a transmission wheel (222); a spline hole (223) is provided at the axis of the transmission wheel (222); the transmission wheel (222) is spline-connected to two spline shafts (224) rotatably mounted on the frame (1) through the spline holes (223); and a rotation driver (225) is provided on the frame (1) for driving the spline shafts (224) to rotate; A fixing plate (226) is provided on the movable base (22) at a side of the conveyor belt (221) away from the negative pressure generating assembly (25), and a linear drive (227) with a horizontally arranged working end is provided on the frame (1), and the working end of the linear drive (227) is fixedly connected to the fixing plate (226).

8. The automatic feeding device for producing degradable plastic bags according to claim 2, characterized in that: The side panels (253) are provided with horizontally extending shells on the upper and lower sides of the inside of the air box (251), and locking bolts (259) are spirally installed at the bottom of the air box (251). The locking bolts (259) are used to lock the positions of the side panels (253) at both ends of the negative pressure generating assembly (25).

9. The automatic feeding device for producing degradable plastic bags according to claim 4, characterized in that: A vertically extending guide rod (244) is provided at the bottom of the air box (241), and the guide rod (244) is inserted into a guide sleeve (239) provided on the movable plate (232); A limiting rod (245) extending horizontally toward the fixed plate (226) is arranged outside the air box (241), and the limiting rod (245) is inserted into a limiting ring groove (228) arranged on a side of the fixed plate (226) facing the conveyor belt (221); The limiting rod (245) moved to the upper side of the limiting ring groove (228) drives the suction nozzle (24) to move upward to a height flush with the upper surface of the support plate (21); the limiting ring groove (228) is provided with a sinking section (229) at the output end of the conveyor belt (221).

10. The automatic feeding device for producing degradable plastic bags according to claim 9, characterized in that: The limiting rod (245) is composed of a coaxially arranged sleeve (246) and a sleeve rod (247); the sleeve rod (247) is inserted into the sleeve (246); a second spring (248) is arranged in the sleeve (246); the elastic force of the second spring (248) pushes the sleeve rod (247) to be inserted into the limiting ring groove (228); The inner width of the limiting ring groove (228) and the sinking section (229) is the same as the diameter of the sleeve rod (247).

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