CN112873927A - Continuous blow molding method for degradable plastic bag - Google Patents
Continuous blow molding method for degradable plastic bag Download PDFInfo
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- CN112873927A CN112873927A CN202110135342.4A CN202110135342A CN112873927A CN 112873927 A CN112873927 A CN 112873927A CN 202110135342 A CN202110135342 A CN 202110135342A CN 112873927 A CN112873927 A CN 112873927A
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- plastic film
- cylindrical plastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/60—Uniting opposed surfaces or edges; Taping
- B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of plastic packaging bag production and processing, and particularly relates to a continuous blow molding method of a degradable plastic bag, which comprises the following steps: step 1: monitoring the air pressure in the cylindrical plastic film discharged by the blow molding die head in real time by using a pressure sensor; step 2: when the pressure sensor detects that instant decompression occurs in the cylindrical plastic film, the cylindrical plastic film is broken, at the moment, an annular air curtain device is used for blowing an annular air curtain around the cylindrical plastic film to enable the cylindrical plastic film to keep an upright state and prevent the cylindrical plastic film from swinging, and meanwhile, a sealing device is used for separating a broken hole area from the cylindrical plastic film below; and step 3: reinforcing lines are hot-sealed in the broken hole area, so that the cylindrical plastic film is prevented from being torn at the broken hole. The invention can ensure the continuous traction and production of materials, realize the emergency treatment of equipment in a non-stop state and improve the production efficiency.
Description
Technical Field
The invention belongs to the technical field of plastic packaging bag production and processing, and particularly relates to a continuous blow molding method for degradable plastic bags.
Background
The plastic bag is generally processed and formed by adopting a blow molding process, and the general process flow comprises the following steps: firstly, heating and melting plastic particles by using a blowing device, blowing the plastic particles into a cylindrical plastic film, then hot-pressing the cylindrical plastic film to form a transverse hot seam, and finally cutting the cylindrical plastic film from the hot seam by using a cutting device to obtain a plastic bag monomer. In the process of blow molding of plastic bags, once impurities are mixed in molten plastic, holes are easily formed in the process of blow molding, the occurrence of the impurities is difficult to avoid, so that the phenomenon of film breakage often occurs in the prior art in the process of blow molding, and when the phenomenon occurs, the method in the prior art is as follows: firstly, the blow molding device is controlled to stop, then the broken hole area is manually torn off from the film, a knot is made on the film at the upper end of the blow molding device, then the blow molding device is restarted, and the film is pulled to the rolling position again. This type of treatment requires a blow molding device to be stopped halfway, so that it is not possible to realize a series connection with a downstream hot sealing and cutting device, and it is difficult to realize continuous automated production, which affects production efficiency.
Disclosure of Invention
The invention aims to provide a method for continuously blow molding degradable plastic bags, which can be used for plugging broken holes generated in the material blow molding process, temporarily reinforcing the broken hole area of materials, ensuring that the materials can be effectively and continuously pulled downstream, and ensuring the continuous production of equipment.
The technical scheme adopted by the invention is as follows:
a continuous blow molding method of degradable plastic bags comprises the following steps:
step 1: monitoring the air pressure in the cylindrical plastic film discharged by the blow molding die head in real time by using a pressure sensor;
step 2: when the pressure sensor detects that instant decompression occurs in the cylindrical plastic film, the cylindrical plastic film is broken, at the moment, an annular air curtain device is used for blowing an annular air curtain around the cylindrical plastic film to enable the cylindrical plastic film to keep an upright state and prevent the cylindrical plastic film from swinging, and meanwhile, a sealing device is used for separating a broken hole area from the cylindrical plastic film below;
and step 3: reinforcing lines are hot-sealed in the broken hole area, so that the cylindrical plastic film is prevented from being torn at the broken hole.
In the step 3, a fracture prevention mechanism is adopted to process the reinforcing lines; the anti-fracture mechanism comprises two conveying rollers which are arranged above the blow molding die head and spaced from the blow molding die head by a certain distance, the roller surfaces of two rollers are mutually attached, a cylindrical plastic film penetrates between the two rollers and is flattened by the two rollers, the rollers are provided with a plurality of second ironing seals which are circumferentially spaced, the second ironing seals are movably connected with the rollers along the radial direction of the rollers, the roller surfaces of the rollers are provided with hollow parts which are in sliding fit with the second ironing seals, the anti-fracture mechanism also comprises a temperature sensor for detecting the temperature of the second ironing seals, an expansion and contraction driving mechanism for driving the second ironing seals to move along the radial direction of the rollers, a rotation driving mechanism for driving the rollers to rotate and a heating switch for controlling the heating state of the second ironing seals, and the air pressure sensor, the temperature sensor, the expansion and contraction driving mechanism, the rotation driving mechanism and the heating switch are all connected with a controller; the second ironing seal strip is flush with the roller surface of the conveying roller and the heating switch is in a closed state in a normal state, when the air pressure sensor detects instant decompression inside the cylindrical plastic film, the controller controls the heating switch to be turned on, the roller flattens the cylindrical plastic film and irones reinforcing lines in a broken hole section of the cylindrical plastic film, the controller controls the expansion and contraction driving mechanism to act after the roller rotates for a specified number of turns, the expansion and contraction driving mechanism drives the second ironing seal strip to collapse into the hollow part, and meanwhile the controller controls the heating switch to be turned off; when the temperature sensor detects that the temperature of the second hot sealing strip is reduced to the normal temperature, the controller controls the expansion and contraction driving mechanism to act, and the expansion and contraction driving mechanism drives the second hot sealing strip to protrude to be parallel to the roller surface of the roller again.
The expansion and contraction driving mechanism comprises a pore plate fixedly connected with the second hot sealing strip and a driving frame movably arranged along the axial direction of the roller, an inclined waist-shaped hole is formed in the pore plate, a driving pin is arranged on the driving frame, the driving pin is in sliding fit with the inclined waist-shaped hole, and the driving frame can drive the second hot sealing strip to move along the radial direction of the roller when moving along the axial direction of the roller; the driving frame comprises a mandrel, the surface of the mandrel is provided with an ear plate which is arranged in a protruding manner along the radial direction, and the driving pin is fixedly connected with the ear plate; the roller is internally provided with a tubular shaft fixedly connected with the roller, the mandrel and the tubular shaft form circumferential fixed axial movable connection through splines, the tubular shaft is rotatably arranged on the rack, the rotary driving mechanism comprises a second servo motor, and the tubular shaft forms transmission fit with a main shaft of the second servo motor through a gear.
The expansion and contraction driving mechanism further comprises a grooved pulley arranged on the mandrel and a shifting fork connected with the rack in a sliding manner along the direction parallel to the axis of the mandrel, the shifting fork is inserted into a ring groove of the grooved pulley and forms sliding fit with the groove, and the shifting fork is fixedly connected with a piston rod of a piston cylinder arranged on the rack; the second scalds the strip of paper used for sealing for rectangular form, and scalds the length direction of strip of paper used for sealing and is on a parallel with the axis direction setting of conveying roller.
In the step 1, the blow molding die head comprises a heating extrusion device with an annular extrusion port and a blowing pipe which is positioned in the center of the annular extrusion port and protrudes upwards, molten plastic extruded by the annular extrusion port expands into a cylindrical plastic film under the action of air pressure of the blowing pipe, and an air pressure sensor is arranged on the blowing pipe.
In the step 2, the sealing device comprises two clamping plates positioned at two sides of the cylindrical plastic film, the two clamping plates are mutually opened and closed, the two clamping plates are movably arranged up and down, and a first hot sealing strip is respectively arranged on the two clamping plates; the device comprises a cylindrical plastic film, a controller, a clamp plate driving mechanism, a pressure sensor and a first hot seal, wherein the clamp plate driving mechanism and the pressure sensor are connected with the controller, the controller sends a control instruction to the clamp plate driving mechanism when the pressure sensor detects that instantaneous pressure loss occurs in the cylindrical plastic film, the clamp plate driving mechanism drives the two clamp plates to be mutually folded and the two clamp plates to synchronously move upwards while being folded, the first hot seal is assembled to enable the first hot seal on the two clamp plates to be mutually folded after the two clamp plates are mutually folded and clamp the cylindrical plastic film, and the first hot seal carries out hot seal on the cylindrical plastic film along the width direction of the cylindrical plastic film so as to isolate a hole area of the cylindrical plastic film from the cylindrical plastic film formed by subsequent blow; the annular air curtain device is located between the blow molding die head and the sealing device, the air curtain device comprises an annular air outlet arranged around the cylindrical plastic film, the annular air outlet is communicated with an air source, a valve is arranged between the annular air outlet and the air source, and the valve is opened when the air pressure sensor detects that instantaneous pressure loss occurs inside the cylindrical plastic film, so that a layer of cylindrical air curtain is formed around the cylindrical plastic film to prevent the cylindrical plastic film from collapsing and swinging.
The clamp plate driving mechanism comprises a swing arm which is rotatably connected with the rack, a rotating shaft of the swing arm is in transmission connection with a clamp plate driving element, a mounting plate which is pivoted with the swing arm is arranged at the end part of the swing arm, a posture control mechanism is arranged on the swing arm, the posture control mechanism is assembled to be always unchanged no matter what angle the swing arm swings to the mounting plate, the clamp plate is movably connected with the mounting plate along the horizontal direction, a first pressure spring is arranged between the clamp plate and the mounting plate, the first hot seal strip is movably connected with the mounting plate along the horizontal direction, and a second pressure spring is arranged between the first hot seal strip and the mounting plate; the attitude control mechanism comprises a first chain wheel fixedly connected with the mounting plate and a second chain wheel fixedly connected with the rack, the axis of the first chain wheel is collinear with the axis of the pivot between the mounting plate and the swing arm, the axis of the second chain wheel is collinear with the axis of the rotating shaft of the swing arm, and an annular chain is arranged between the first chain wheel and the second chain wheel; the splint driving element is a first servo motor, and a rotating shaft of the swing arm is in transmission fit with a main shaft of the first servo motor through a chain wheel mechanism or a synchronous pulley mechanism.
The clamping plates are provided with first grooves in sliding fit with the first hot sealing strips, the first hot sealing strips are sunk into the first grooves in a normal state, and when the two clamping plates are mutually folded, the first compression springs are compressed to fold the first hot sealing strips on the two clamping plates; one row of pricking nails are arranged above the first groove of one of the clamping plates, one row of pricking holes are arranged above the first groove of the other clamping plate, and when the two clamping plates are mutually closed, the pricking nails can pierce the cylindrical plastic film and are inserted into the pricking holes, so that a row of exhaust holes are formed in the cylindrical plastic film above the first hot sealing strip.
The annular air curtain device also comprises an annular air chamber, the annular air outlet is arranged at the edge of the inner side of the upper end surface of the annular air chamber, an air inlet is arranged on the side wall of the annular air chamber, the air inlet is communicated with an air source through an air inlet pipe, and the valve is arranged on the air inlet pipe; the air equalizing plate is arranged in the annular air chamber and comprises a plurality of annular plate bodies which are concentrically arranged at intervals, one end of each annular plate body is fixedly connected with the top wall or the bottom wall of the annular air chamber, the other end of each annular plate body is arranged at intervals with the top wall or the bottom wall of the annular air chamber, and a circuitous air flow channel is formed between the annular plate bodies; the valve comprises a valve casing and a valve core, an airflow channel is arranged in the valve casing, the valve core is movably connected with the valve casing along the radial direction of the airflow channel, a radial through hole is formed in the valve core, the valve is opened when the radial through hole is communicated with the airflow channel, and the valve is closed when the radial through hole is staggered with the airflow channel.
A first linkage mechanism is arranged between the valve and the clamping plate driving mechanism, and is assembled to drive the valve to be opened simultaneously when the clamping plate driving element drives the swing arm to swing, and drive the valve to be closed after the clamping plate driving element drives the swing arm to swing for one circle; the first linkage mechanism comprises a mandril fixedly connected with the valve core, the mandril is movably connected with the rack in the vertical direction, a third pressure spring is arranged between the mandril and the rack, a pressing plate is fixedly connected to the upper end of the mandril, a cam is arranged on a rotating shaft of the swing arm, the cam is in abutting fit with the pressing plate, the valve is in a closed state when the pressing plate is pressed down by the cam, and the valve core is switched to an open state under the action of the third pressure spring when the cam rotates away from the pressing plate.
The invention has the technical effects that: according to the invention, the annular air curtain device is adopted to guide and support the materials after the hole is broken, and meanwhile, the sealing device is utilized to seal the hole area, so that the blow molding pressure in the materials is ensured; in addition, the hot sealing strip is of a telescopic structure, so that hot sealing of materials can be stopped in time, and the hot pressing of the residual temperature of the hot sealing strip on normal materials is avoided.
Drawings
FIG. 1 is a perspective view of a blow molding apparatus provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a blow mold head provided by an embodiment of the present invention;
FIG. 3 is a perspective view of an annular air curtain apparatus and a closure apparatus provided by an embodiment of the present invention;
FIG. 4 is a perspective view of a closure provided by an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a closure provided in accordance with an embodiment of the present invention;
FIG. 6 is a cross-sectional view of an annular air curtain apparatus provided by an embodiment of the present invention;
FIG. 7 is a partial exploded view of a closure provided in accordance with an embodiment of the present invention;
FIG. 8 is a partial cross-sectional view of a closure provided by an embodiment of the present invention;
FIG. 9 is a perspective view of an anti-fracture mechanism provided by an embodiment of the present invention;
FIG. 10 is a partial perspective view of an anti-fracture mechanism conveyor roller provided by an embodiment of the present invention;
fig. 11 is an expansion and contraction driving mechanism provided by an embodiment of the present invention.
The rack in the invention refers to a supporting structure fixed with the ground, the supporting structure of the rack is hidden in the attached drawing of the invention, and the specific shape of the supporting structure can be selected according to the actual spatial layout.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
Example 1
As shown in fig. 1, a degradable plastic bag blowing device comprises a blowing die head 10, and an annular air curtain device 20, a sealing device 30 and an anti-breaking mechanism 40 which are sequentially arranged above the blowing die head 10 from bottom to top; as shown in fig. 2, the blow molding die head 10 includes a heating extrusion device 11 having an annular extrusion opening and a blowing pipe 12 located at the center of the annular extrusion opening and protruding upward, the molten plastic extruded from the annular extrusion opening expands into a cylindrical plastic film 1 under the action of the air pressure of the blowing pipe 12, and the blowing pipe 12 is provided with an air pressure sensor 652.
As shown in fig. 3, 4, 5, 7, and 8, the sealing device 30 includes two clamping plates 33 located at two sides of the cylindrical plastic film 1, the two clamping plates 33 are opened and closed with each other, the two clamping plates 33 are movably arranged up and down, and a first hot seal strip 34 is respectively arranged on the two clamping plates 33; the device is characterized by further comprising a clamping plate driving mechanism for driving the clamping plates 33 to act, wherein the clamping plate driving mechanism and the air pressure sensor 652 are connected with a controller, when the air pressure sensor 652 detects that instantaneous pressure loss occurs in the cylindrical plastic film 1, the phenomenon that the cylindrical plastic film 1 is broken is indicated, the controller sends a control instruction to the clamping plate driving mechanism, the clamping plate driving mechanism drives the two clamping plates 33 to be mutually folded and the two clamping plates 33 synchronously move upwards, the first hot seal strip 34 is assembled to enable the first hot seal strips 34 on the two clamping plates 33 to be mutually folded after the two clamping plates 33 are mutually folded and clamp the cylindrical plastic film 1, and the first hot seal strip 34 carries out hot seal on the cylindrical plastic film 1 along the width direction of the cylindrical plastic film 1 so as to isolate the broken hole area of the cylindrical plastic film 1 from the cylindrical plastic film 1 formed by subsequent blow molding.
As shown in fig. 3, 5, and 6, the annular air curtain device 20 is located between the blow molding die head 10 and the sealing device 30, the air curtain device includes an annular air outlet 21 disposed around the cylindrical plastic film 1, the annular air outlet 21 is communicated with an air source, a valve 23 is disposed between the annular air outlet 21 and the air source, when the air pressure sensor 652 detects that an instantaneous pressure loss occurs inside the cylindrical plastic film 1, the valve 23 is opened, so that a cylindrical air curtain is formed around the cylindrical plastic film 1 to prevent the cylindrical plastic film 1 from collapsing and swinging.
As shown in fig. 9, 10, and 11, the breakage preventing mechanism 40 includes two rollers 41, the roller surfaces of the two rollers 41 are attached to each other, the cylindrical plastic film 1 passes through between the two rollers 41 and is flattened by the two rollers 41, the two rollers 41 pull the cylindrical plastic film 1 upward and transport the cylindrical plastic film to downstream equipment, a plurality of second ironing seals 42 are arranged on the rollers 41 at intervals along the circumferential direction, the second ironing seals 42 are movably connected with the rollers 41 along the radial direction of the rollers 41, and hollow portions in sliding fit with the second ironing seals 42 are arranged on the roller surfaces of the rollers 41; the temperature sensor 652 for detecting the temperature of the second hot seal 42, the expansion and contraction driving mechanism for driving the second hot seal 42 to move along the radial direction of the roller 41, the rotary driving mechanism for driving the roller 41 to rotate, and the heating switch for controlling the heating state of the second hot seal 42 are further included, and the temperature sensor 652, the expansion and contraction driving mechanism, the rotary driving mechanism and the heating switch are all connected with the controller; the second hot seal 42 is flush with the roller surface of the conveying roller and the heating switch is in a closed state in a normal state, when the air pressure sensor 652 detects that the inside of the cylindrical plastic film 1 is subjected to instantaneous pressure loss, the controller controls the heating switch to be turned on, the roller 41 flattens the cylindrical plastic film 1 and seals reinforcing grains in a hole breaking section of the cylindrical plastic film 1 in a hot sealing mode, the controller controls the expansion and contraction driving mechanism to act after the roller 41 rotates for a specified number of turns, the expansion and contraction driving mechanism drives the second hot seal 42 to sink into the hollow part, and meanwhile the controller controls the heating switch to be turned off; when the temperature sensor 652 detects that the temperature of the second hot seal 42 is reduced to normal temperature, the controller controls the expansion and contraction driving mechanism to operate, the expansion and contraction driving mechanism drives the second hot seal 42 to protrude to be flush with the roller surface of the roller 41 again, and after the hole breaking area passes through the roller, the second hot seal 42 contracts, so that the second hot seal 42 can be ensured to stop the hot seal operation on the material in time, and the situation that the residual temperature on the second hot seal 42 generates hot pressure on the subsequently produced material is avoided.
The invention can realize plugging and continuous traction on the broken hole area without stopping the machine, thereby improving the production efficiency of the equipment.
Preferably, splint actuating mechanism includes the swing arm 32 of being connected with the frame rotation, and the pivot and the splint driving element transmission of swing arm 32 are connected, and the tip of swing arm 32 is equipped with the mounting panel 31 with swing arm 32 pin joint, be equipped with attitude control mechanism on the swing arm 32, attitude control mechanism is assembled to remain unchanged for no matter what kind of angle mounting panel 31's gesture is swung to swing arm 32 all the time, splint 33 is equipped with first pressure spring 311 along horizontal direction and mounting panel 31 swing joint and between splint 33 and the mounting panel 31, first boiling hot strip of paper used for sealing 34 is equipped with second pressure spring 312 along horizontal direction and mounting panel 31 swing joint and first boiling hot strip of paper used for sealing 34 and mounting panel 31 between. Because the swing path of the swing arm 32 is a circular path, in order to enable longer contact time to exist between the two clamping plates 33 and between the two first ironing seals 34, the two clamping plates 33 and the mounting plate 31 are movably connected and provided with the compression springs, so that the two clamping plates 33 and the two first ironing seals can be folded before the swing arm 32 swings to the horizontal state, and the swing of the swing arm 32 cannot be blocked.
Preferably, the attitude control mechanism comprises a first chain wheel 35 fixedly connected with the mounting plate 31 and a second chain wheel 36 fixedly connected with the frame, the axis of the first chain wheel 35 is collinear with the axis of the pivot between the mounting plate 31 and the swing arm 32, the axis of the second chain wheel 36 is collinear with the axis of the rotating shaft of the swing arm 32, and an annular chain 37 is arranged between the first chain wheel 35 and the second chain wheel 36. The principle is that the first chain wheel 35 and the second chain wheel 36 are constrained by the annular chain 37 to ensure consistent postures, the second chain wheel 36 is fixedly connected with the frame, the posture of the first chain wheel 35 is kept unchanged all the time, and then the posture of the mounting plate 31 is kept unchanged all the time.
Preferably, the splint driving element is a first servo motor 39, and the rotating shaft of the swing arm 32 is in transmission fit with the main shaft of the first servo motor 39 through a chain wheel mechanism or a synchronous pulley mechanism.
Preferably, the clamping plate 33 is provided with a first groove in sliding fit with the first hot seal 34, the first hot seal 34 is sunken into the first groove in a normal state, and when the two clamping plates 33 are folded, the first compression spring 311 is compressed to fold the first hot seals 34 on the two clamping plates 33; a row of pricking nails 331 is arranged above the first groove of one of the clamping plates 33, a row of pricking holes 332 is arranged above the first groove of the other clamping plate 33, when the two clamping plates 33 are folded, the pricking nails 331 can pierce the cylindrical plastic film 1 and are inserted into the pricking holes 332, so that a row of exhaust holes are formed on the cylindrical plastic film 1 above the first ironing seal 34. When the cylindrical plastic film 1 is flattened, air remained between the lower part of the hole breaking area and the hot sealing opening can be discharged from the vent hole.
Preferably, the annular air curtain device 20 further includes an annular air chamber 22, the annular air outlet 21 is disposed at an inner edge of an upper end surface of the annular air chamber 22, an air inlet is disposed on a side wall of the annular air chamber 22, the air inlet is communicated with an air source through an air inlet pipe, and the valve 23 is disposed on the air inlet pipe; the annular air chamber 22 is internally provided with an air equalizing plate 24, the air equalizing plate 24 comprises a plurality of annular plate bodies concentrically arranged at intervals, one end of each annular plate body is fixedly connected with the top wall or the bottom wall of the annular air chamber 22, the other end of each annular plate body is arranged at intervals with the top wall or the bottom wall of the annular air chamber 22, and a roundabout air flow channel is formed between each annular plate body.
Preferably, the valve 23 includes a valve housing 231 and a valve core 232, an airflow channel is arranged in the valve housing 231, the valve core 232 is movably connected with the valve housing 231 along the radial direction of the airflow channel, a radial through hole is arranged on the valve core 232, the valve 23 is opened when the radial through hole is communicated with the airflow channel, and the valve 23 is closed when the radial through hole is staggered with the airflow channel; a first linkage mechanism is arranged between the valve 23 and the splint driving mechanism, and is assembled to drive the valve 23 to be opened simultaneously when the splint driving element driving swing arm 32 starts to swing, and drive the valve 23 to be closed after the splint driving element driving swing arm 32 swings for one circle; the first linkage mechanism comprises a push rod 233 fixedly connected with the valve core 232, the push rod 233 is movably connected with the rack in the vertical direction, a third pressure spring 234 is arranged between the push rod 233 and the rack, a pressure plate is fixedly connected to the upper end of the push rod 233, a cam 38 is arranged on a rotating shaft of the swing arm 32, the cam 38 is in interference fit with the pressure plate, the valve 23 is in a closed state when the cam 38 presses down the pressure plate, and the valve core 232 is switched to an open state under the action of the third pressure spring 234 when the cam 38 rotates away from the pressure plate. The invention realizes the linkage of the sealing device 30 and the annular air curtain device 20 through the first linkage mechanism, simplifies the equipment structure, reduces the equipment cost, and has higher reliability of a mechanical transmission structure compared with a single electric control mode.
Preferably, the expansion and contraction driving mechanism comprises a hole plate 421 fixedly connected with the second hot seal strip 42 and a driving frame movably arranged along the axial direction of the roller 41, the hole plate 421 is provided with an inclined waist-shaped hole 422, the driving frame is provided with a driving pin 432, the driving pin 432 is in sliding fit with the inclined waist-shaped hole 422, and when the driving frame moves along the axial direction of the roller 41, the driving frame can drive the second hot seal strip 42 to move along the radial direction of the roller 41; the driving frame comprises a mandrel 43, an ear plate 431 which is arranged in a protruding and protruding manner along the radial direction is arranged on the axial surface of the mandrel 43, and the driving pin 432 is fixedly connected with the ear plate 431; the roller 41 is internally provided with a pipe shaft 411 fixedly connected with the roller 41, the mandrel 43 and the pipe shaft 411 form a circumferential fixed axial movable connection through a spline, the pipe shaft 411 is rotatably arranged on the rack, the rotary driving mechanism comprises a second servo motor 46, and the pipe shaft 411 forms a transmission fit with a main shaft of the second servo motor 46 through a gear.
Preferably, the expansion and contraction driving mechanism further comprises a grooved wheel 433 arranged on the mandrel 43 and a shifting fork 44 connected with the rack in a sliding manner along the axial direction parallel to the mandrel 43, the shifting fork 44 is inserted into a ring groove of the grooved wheel 433 and forms a sliding fit with the groove, and the shifting fork 44 is fixedly connected with a piston rod of a piston cylinder 45 arranged on the rack.
Preferably, the second hot seal strip 42 is long, and the length direction of the hot seal strip is parallel to the axial direction of the conveying roller.
Example 2
A continuous blow molding method of degradable plastic bags comprises the following steps:
step 1: the pressure in the cylindrical plastic film 1 discharged from the blow die 10 of example 1 was monitored in real time by the pressure sensor 652;
step 2: when the pressure sensor 652 detects that the instant decompression occurs in the cylindrical plastic film 1, it indicates that a hole is formed in the cylindrical plastic film 1, at this time, the annular air curtain device 20 described in embodiment 1 is used to blow an annular air curtain around the cylindrical plastic film 1 to keep the cylindrical plastic film 1 in an upright state and prevent the cylindrical plastic film 1 from swinging, and at the same time, the sealing device 30 described in embodiment 1 is used to separate the hole area from the cylindrical plastic film 1 below;
and step 3: reinforcing lines are hot-sealed in the broken hole area, so that the cylindrical plastic film 1 is prevented from being torn at the broken hole.
In the step 3, the reinforcing texture is processed by using the anti-fracture mechanism 40 described in embodiment 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.
Claims (10)
1. A continuous blow molding method of degradable plastic bags is characterized in that: the method comprises the following steps:
step 1: monitoring the air pressure in the cylindrical plastic film (1) discharged by the blow molding die head (10) in real time by using a pressure sensor (652);
step 2: when the pressure sensor (652) detects that instantaneous decompression occurs in the cylindrical plastic film (1), the cylindrical plastic film (1) is broken, at the moment, an annular air curtain device (20) is used for blowing an annular air curtain around the cylindrical plastic film (1) to enable the cylindrical plastic film (1) to keep an upright state and prevent the cylindrical plastic film (1) from swinging, and meanwhile, a sealing device (30) is used for separating a broken hole area from the cylindrical plastic film (1) below;
and step 3: reinforcing lines are hot-sealed in the broken hole area, so that the cylindrical plastic film (1) is prevented from being torn at the broken hole.
2. The continuous blow molding method of degradable plastic bags according to claim 1, characterized in that: in the step 3, a fracture prevention mechanism (40) is adopted to process the reinforcing lines; the anti-breaking mechanism (40) comprises two conveying rollers which are arranged above the blow molding die head (10) and spaced from the blow molding die head (10), the roller surfaces of the two rollers (41) are mutually attached, the cylindrical plastic film (1) penetrates between the two rollers (41) and is flattened by the two rollers (41), a plurality of second hot seal strips (42) which are arranged at intervals along the circumferential direction are arranged on the rollers (41), the second hot seal strips (42) are movably connected with the rollers (41) along the radial direction of the rollers (41), hollow parts which are in sliding fit with the second hot seal strips (42) are arranged on the roller surfaces of the rollers (41), the anti-breaking mechanism further comprises a temperature sensor (652) for detecting the temperature of the second hot seal strips (42), an expansion and contraction driving mechanism for driving the second hot seal strips (42) to move along the radial direction of the rollers (41), a rotary driving mechanism for driving the rollers (41) to rotate, and a heating switch for controlling the heating state of the second seal strips (42), the air pressure sensor (652), the temperature sensor (652), the expansion and contraction driving mechanism, the rotary driving mechanism and the heating switch are all connected with the controller; the second hot seal strip (42) is parallel to the roller surface of the conveying roller and the heating switch is in a closed state in a normal state, when the air pressure sensor (652) detects that the interior of the cylindrical plastic film (1) is subjected to instantaneous pressure loss, the controller controls the heating switch to be turned on, the reinforcing lines are hot sealed in a broken hole section of the cylindrical plastic film (1) while the cylindrical plastic film (1) is flattened by the roller (41), the controller controls the expansion and contraction driving mechanism to act after the roller (41) rotates for a specified number of turns, the expansion and contraction driving mechanism drives the second hot seal strip (42) to be hollowed in a hollow part, and the controller controls the heating switch to be turned off; when the temperature sensor (652) detects that the temperature of the second hot seal strip (42) is reduced to the normal temperature, the controller controls the expansion and contraction driving mechanism to act, and the expansion and contraction driving mechanism drives the second hot seal strip (42) to protrude to be flush with the roller surface of the roller (41) again.
3. The continuous blow molding method of degradable plastic bags according to claim 2, characterized in that: the expansion and contraction driving mechanism comprises a pore plate (421) fixedly connected with the second hot seal strip (42) and a driving frame movably arranged along the axial direction of the roller (41), an inclined waist-shaped hole (422) is formed in the pore plate (421), a driving pin (432) is arranged on the driving frame, the driving pin (432) is in sliding fit with the inclined waist-shaped hole (422), and the second hot seal strip (42) can be driven to move along the radial direction of the roller (41) when the driving frame moves along the axial direction of the roller (41); the driving frame comprises a mandrel (43), an ear plate (431) which is arranged in a protruding and protruding manner along the radial direction is arranged on the axial surface of the mandrel (43), and the driving pin (432) is fixedly connected with the ear plate (431); the roller is characterized in that a pipe shaft (411) fixedly connected with the roller (41) is arranged in the roller (41), the mandrel (43) and the pipe shaft (411) form a circumferential fixed axial movable connection through a spline, the pipe shaft (411) is rotatably arranged on the rack, the rotary driving mechanism comprises a second servo motor (46), and the pipe shaft (411) forms a transmission fit with a main shaft of the second servo motor (46) through a gear.
4. The continuous blow molding method of degradable plastic bags according to claim 3, characterized in that: the expansion and contraction driving mechanism further comprises a grooved wheel (433) arranged on the mandrel (43) and a shifting fork (44) which is connected with the rack in a sliding mode along the direction parallel to the axis of the mandrel (43), the shifting fork (44) is inserted into a ring groove of the grooved wheel (433) and forms sliding fit with the groove, and the shifting fork (44) is fixedly connected with a piston rod of a piston cylinder (45) arranged on the rack; the second hot sealing strip (42) is long-strip-shaped, and the length direction of the hot sealing strip is parallel to the axis direction of the conveying roller.
5. The method for continuously blow molding degradable plastic bags according to claim 1, wherein: in the step 1, the blow molding die head (10) comprises a heating extrusion device (11) with an annular extrusion opening and a blowing pipe (12) which is positioned in the center of the annular extrusion opening and protrudes upwards, molten plastic extruded by the annular extrusion opening expands into a cylindrical plastic film (1) under the air pressure action of the blowing pipe (12), and an air pressure sensor (652) is arranged on the blowing pipe (12).
6. The continuous blow molding method of degradable plastic bags according to claim 1, characterized in that: in the step 2, the sealing device (30) comprises two clamping plates (33) positioned at two sides of the cylindrical plastic film (1), the two clamping plates (33) are mutually opened and closed, the two clamping plates (33) are movably arranged up and down, and the two clamping plates (33) are respectively provided with a first hot sealing strip (34); also comprises a splint driving mechanism for driving the splint (33) to act, the splint driving mechanism and the air pressure sensor (652) are both connected with the controller, when the air pressure sensor (652) detects that instantaneous pressure loss occurs in the cylindrical plastic film (1), the controller sends a control instruction to the clamping plate driving mechanism, the clamping plate driving mechanism drives the two clamping plates (33) to be mutually folded and synchronously move upwards while the two clamping plates (33) are simultaneously folded, the first hot seal strip (34) is assembled to be folded after the two clamping plates (33) are mutually folded and clamp the cylindrical plastic film (1), and the first hot seal strip (34) carries out hot seal on the cylindrical plastic film (1) along the width direction of the cylindrical plastic film (1) so as to isolate a hole breaking area of the cylindrical plastic film (1) from the cylindrical plastic film (1) formed by subsequent blow molding; annular air curtain device (20) are located between blow molding die head (10) and closing device (30), the air curtain device is including annular air outlet (21) that encircles tube-shape plastic film (1) and set up, and annular air outlet (21) and air supply intercommunication are equipped with valve (23) between annular air outlet (21) and the air supply, and valve (23) are opened when baroceptor (652) detect that tube-shape plastic film (1) is inside to appear losing pressure in the twinkling of an eye, make tube-shape plastic film (1) form one deck tube-shape air curtain around forming in order to prevent that tube-shape plastic film (1) from collapsing and swing.
7. The continuous blow molding method of degradable plastic bags according to claim 6, wherein: the clamp plate driving mechanism comprises a swing arm (32) which is connected with the rack in a rotating mode, a rotating shaft of the swing arm (32) is in transmission connection with a clamp plate driving element, a mounting plate (31) which is pivoted with the swing arm (32) is arranged at the end of the swing arm (32), an attitude control mechanism is arranged on the swing arm (32), the attitude control mechanism is assembled to keep the attitude of the mounting plate (31) unchanged no matter what angle the swing arm (32) swings to, the clamp plate (33) is movably connected with the mounting plate (31) along the horizontal direction, a first pressure spring (311) is arranged between the clamp plate (33) and the mounting plate (31), and a second pressure spring (312) is arranged between the first hot seal (34) and the mounting plate (31) along the horizontal direction; the attitude control mechanism comprises a first chain wheel (35) fixedly connected with the mounting plate (31) and a second chain wheel (36) fixedly connected with the rack, the axis of the first chain wheel (35) is collinear with the axis of a pivot between the mounting plate (31) and the swing arm (32), the axis of the second chain wheel (36) is collinear with the axis of a rotating shaft of the swing arm (32), and an annular chain (37) is arranged between the first chain wheel (35) and the second chain wheel (36); the splint driving element is a first servo motor (39), and a rotating shaft of the swing arm (32) forms transmission fit with a main shaft of the first servo motor (39) through a chain wheel mechanism or a synchronous pulley mechanism.
8. The continuous blow molding method of degradable plastic bags according to claim 7, characterized in that: the first grooves which are in sliding fit with the first hot seal strips (34) are formed in the clamping plates (33), the first hot seal strips (34) are sunk into the first grooves in a normal state, and when the two clamping plates (33) are mutually folded, the first compression springs (311) are compressed to enable the first hot seal strips (34) on the two clamping plates (33) to be folded; one row of pricking nails (331) are arranged above the first groove of one clamping plate (33), one row of pricking holes (332) are arranged above the first groove of the other clamping plate (33), and when the two clamping plates (33) are mutually folded, the pricking nails (331) can pierce the cylindrical plastic film (1) and are inserted into the pricking holes (332), so that a row of exhaust holes are formed in the cylindrical plastic film (1) above the first scalding seal (34).
9. The continuous blow molding method of degradable plastic bags according to claim 8, characterized in that: the annular air curtain device (20) further comprises an annular air chamber (22), the annular air outlet (21) is formed in the edge of the inner side of the upper end face of the annular air chamber (22), an air inlet is formed in the side wall of the annular air chamber (22), the air inlet is communicated with an air source through an air inlet pipe, and the valve (23) is arranged on the air inlet pipe; an air equalizing plate (24) is arranged in the annular air chamber (22), the air equalizing plate (24) comprises a plurality of annular plate bodies which are concentrically arranged at intervals, one end of each annular plate body is fixedly connected with the top wall or the bottom wall of the annular air chamber (22), the other end of each annular plate body is arranged at intervals with the top wall or the bottom wall of the annular air chamber (22), and a roundabout air flow channel is formed between each annular plate body; valve (23) include valve casing (231) and case (232), be equipped with airflow channel in valve casing (231), case (232) are along airflow channel's radial and valve casing (231) swing joint, are equipped with radial through-hole on case (232), and valve (23) are opened when radial through-hole and airflow channel communicate, and valve (23) are closed when radial through-hole staggers with airflow channel.
10. The continuous blow molding method of degradable plastic bags according to claim 9, characterized in that: a first linkage mechanism is arranged between the valve (23) and the splint driving mechanism, and is assembled to drive the valve (23) to be opened simultaneously when the splint driving element driving swing arm (32) starts to swing, and drive the valve (23) to be closed after the splint driving element driving swing arm (32) swings for one circle; the first linkage mechanism comprises a push rod (233) fixedly connected with the valve core (232), the push rod (233) is movably connected with the rack in the vertical direction, a third pressure spring (234) is arranged between the push rod (233) and the rack, a pressure plate is fixedly connected to the upper end of the push rod (233), a cam (38) is arranged on a rotating shaft of the swing arm (32), the cam (38) is in interference fit with the pressure plate, the valve (23) is in a closed state when the cam (38) presses down the pressure plate, and the valve core (232) is switched to an open state under the action of the third pressure spring (234) when the cam (38) rotates away from the pressure plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110135342.4A CN112873927A (en) | 2021-02-01 | 2021-02-01 | Continuous blow molding method for degradable plastic bag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110135342.4A CN112873927A (en) | 2021-02-01 | 2021-02-01 | Continuous blow molding method for degradable plastic bag |
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| Publication Number | Publication Date |
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| CN112873927A true CN112873927A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110135342.4A Withdrawn CN112873927A (en) | 2021-02-01 | 2021-02-01 | Continuous blow molding method for degradable plastic bag |
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| CN (1) | CN112873927A (en) |
Cited By (4)
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| CN111923460A (en) * | 2020-08-09 | 2020-11-13 | 翁杰 | Manufacturing process of anti-seismic plastic bubble bag |
| CN115108105A (en) * | 2022-08-23 | 2022-09-27 | 江苏创衡智能装备有限公司 | Control and regulation system for automatic powder packaging machine |
| CN116766571A (en) * | 2023-08-21 | 2023-09-19 | 佛山市双富包装有限公司 | Film blowing device with damage detection function and film damage detection method |
| CN117921904A (en) * | 2024-03-21 | 2024-04-26 | 上海田强环保科技股份有限公司 | Polyethylene plastic waste material treatment facility that breaks |
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| CN116766571A (en) * | 2023-08-21 | 2023-09-19 | 佛山市双富包装有限公司 | Film blowing device with damage detection function and film damage detection method |
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| CN117921904A (en) * | 2024-03-21 | 2024-04-26 | 上海田强环保科技股份有限公司 | Polyethylene plastic waste material treatment facility that breaks |
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