阅读说明：本技术 一种制备聚乳酸胚材的设备 (Equipment for preparing polylactic acid blank ) 是由 张伟栋 张伟丹 张艳娟 于 2021-10-09 设计创作，主要内容包括：本发明涉及一种制备聚乳酸胚材的设备。本发明可以以聚乳酸粉为原料,经过装料、热熔压滤、锻压成型、冷却出料的工序加工得到聚乳酸胚材,压胚工作台的独特设计,保证了压胚工作台在传送装置上可以轻松掉头不会卡死,而成型模具便于拆卸,可以根据需要更换不同的模具,成型模具的弹簧结构配合顶块,方便了成型胚材的脱模；另外,设计的压滤装置可以有效的将熔融状态的聚乳酸中的不熔物压到胚材最底部,便于后期的处理；而锻压成型装置可以对胚材进行锻压,配置的烘烤箱、热风装置、冷风装置及喷淋装置,配合工作制备的聚乳酸胚材力学性能更好,可以广泛用于不同行业；整套设备循环作业,具有更高的生产效率。(The invention relates to a device for preparing polylactic acid blanks. According to the invention, polylactic acid powder can be used as a raw material, and a polylactic acid blank is obtained through the processes of loading, hot-melt press filtration, forging and pressing molding, cooling and discharging, and the unique design of the blank pressing workbench ensures that the blank pressing workbench can easily turn around and cannot be blocked on a conveying device, so that the formed die is convenient to disassemble, different dies can be replaced according to needs, and the spring structure of the forming die is matched with the ejector block, so that the demoulding of the formed blank is convenient; in addition, the designed filter pressing device can effectively press infusible substances in the polylactic acid in a molten state to the bottommost part of the blank, so that the later treatment is facilitated; the forging and pressing forming device can forge and press the stock, and the prepared baking box, the hot air device, the cold air device and the spraying device are matched to work, so that the prepared polylactic acid stock has better mechanical property and can be widely used in different industries; the whole set of equipment is operated circularly, and the production efficiency is higher.)

1. An equipment for preparing polylactic acid stock, which is characterized in that: the device comprises a conveying device (1), wherein the conveying device (1) is of a chain conveying structure, a chain wheel (102) is driven to rotate through a driving motor (101), two chains (103) are installed on the chain wheel (102) in a transmission fit mode, the chains (103) are located on two sides of the conveying device (1), positioning sliding grooves (105) are formed in the two side faces of the conveying device (1) at the positions, which are equidistant, of the outer ring of the chain (103), blank pressing workbenches (2) are fixedly connected to the chain (103) at equal intervals, the blank pressing workbenches (2) are slidably buckled in the positioning sliding grooves (105) and can be circularly driven along with the chains (103), the conveying device (1) is divided into four stations from left to right, photoelectric proximity switches (15) are fixedly installed at the positions, corresponding to each station, of the top of the side wall of the conveying device (1), and the photoelectric proximity switches (15) are distributed at equal intervals, a storage tank (3), a baking box (4) and a cold air box (5) are sequentially arranged above the conveying device (1) from left to right, an electromagnetic valve is arranged at a discharge port of the storage tank (3), the baking box (4) is also fixedly connected at the middle position below the conveying device (1), the upper baking box and the lower baking box (4) are corresponding to each other, two ends of the baking box (4) and two ends of the cold air box (5) are communicated, a pressure filter device (6) and a forging and pressing forming device (7) are fixedly arranged at the top of the baking box (4) above the conveying device (1), a pressing and discharging device (8) is fixedly arranged at the middle position at the top of the cold air box (5), the storage tank (3), the pressure filter device (6), the forging and pressing forming device (7) and the pressing and discharging device (8) are respectively in one-to-one correspondence with the four photoelectric proximity switches (15), the left and right sides of the baking box (4) above the conveying device (1) are divided into a heating area and a hot air heat preservation area, an electric heating pipe (401) is arranged in an inner cavity of the heating area of the baking box (4), the filter pressing device (6) is positioned in the heating area of the baking box (4), the top of the hot air heat preservation area of the baking box (4) is communicated and connected with a hot air device (9) through a pipeline, the forging and pressing device (7) is positioned in the hot air heat preservation area of the baking box (4), the hot air device (9) is also communicated and connected onto the baking box (4) below the conveying device (1) through a pipeline, the tops of two ends of the cold air box (5) are communicated and connected with a cold air device (10) through a pipeline, the middle position of the top of the cold air box (5) is communicated and connected with a spraying device (11) through a pipeline, and water outlets of the spraying device (11) are positioned at the left side and the right side of the pressing and discharging device (8), forging and pressing forming device (7) with press down between discharging device (8) conveyer (1) middle part has seted up notch (104) that gathers materials, collection drawer (14) have been placed to sliding fit in the notch (104) that gathers materials, leak (1401) have been seted up on collection drawer (14) bottom surface, spray set (11) with collection drawer (14) correspond conveyer (1)'s right-hand member below has placed basin (12), solenoid valve, electrothermal tube (401), filter pressing device (6), forging and pressing forming device (7) on conveyer (1), storage tank (3), press discharging device (8), hot-blast device (9), cold wind device (10), spray set (11), photoelectricity proximity switch (15) respectively with electrical system (13) electric connection.

2. The apparatus for manufacturing a poly lactic acid billet according to claim 1, wherein: the embryo pressing workbench (2) comprises a front supporting rod (201) and a rear supporting rod (202) which are parallel to each other and fixedly connected to the chain (103), the two ends of the front supporting rod (201) and the two ends of the rear supporting rod (202) are slidably buckled in the positioning sliding grooves (105), the upper surface of the front supporting rod (103) is fixedly connected to the front end of the base (203), the middle position of the upper surface of the rear end of the base (203) is provided with a chute (204), the lower part of the rear end is provided with a movable cavity (208), the rear supporting rod (202) penetrates through the movable cavity (208), one end, close to the photoelectric proximity switch (15), of the upper surface of the front supporting rod (201) is fixedly connected with a proximity switch assembly (205), the center position of the upper surface of the base (203) is provided with an installation cavity (209), and the bottom of the installation cavity (209) is provided with a top block (207) through thread fit, four shrinkage cavities (210) are formed in the upper surface of the base (203) on the periphery of the mounting cavity (209), a forming die (206) is fixedly connected to the shrinkage cavities (210) through screws (211), the forming die (206) is slidably inserted into the mounting cavity (209), and the top block (207) is slidably inserted into the forming die (206).

3. The apparatus for manufacturing a poly lactic acid billet according to claim 2, wherein: forming die (206) is the cross and its middle division is equipped with die cavity (2061), die cavity (2061) upper end opening edge is seted up and is had inclined plane chamfer (2062), kicking block (207) slip grafting is in die cavity (2061) bottom, forming die (206) upper surface is close to ejection of compact spout (2063) have been seted up to one side of chute (204), forming die (206) all around below fixedly connected with four springs (2064), spring (2064) lower extreme fixedly connected with threaded connection board (2065), spring (2064) one-to-one install in shrink chamber (210), screw (211) threaded connection be in on the threaded connection board (2065).

4. The apparatus for manufacturing a poly lactic acid billet according to claim 3, wherein: the filter-pressing device (6) comprises a filter-pressing electric telescopic rod (601) fixedly connected to the top of the baking box (4), the telescopic end of the filter-pressing electric telescopic rod (601) vertically extends downwards into the inner cavity of the baking box (4) and is fixedly connected with a filter-pressing head (602), the shape of the filter-pressing head (602) is the same as that of the opening of the die cavity (2061), the lower surface of the filter-pressing head (602) is a plane, the upper surface of the plane is an arc surface, and filter holes are formed in the upper surface of the filter-pressing head, the telescopic end of the filter-pressing electric telescopic rod (601) slides to penetrate through a dredging seat (603), a mounting hole (606) is formed in the dredging seat (603) and is fixedly mounted at the top of the inner cavity of the baking box (4) through a screw, a steel needle (604) is fixedly connected to the middle position of the lower surface of the dredging seat (603), a limiting plate (605) is fixedly connected to the side edges of the steel needle (604), and the filter holes in the filter-pressing head (602) are in one-to one correspondence, the filter pressing head (602) is slidably buckled between the limit plates (605).

5. The apparatus for manufacturing a poly lactic acid billet according to claim 1, wherein: forging and pressing forming device (7) include piezoelectricity telescopic link (701) and lower support electric telescopic link (702), it is in to go up piezoelectricity telescopic link (701) fixed connection toast case (4) top and its flexible end vertical downwardly extending toast in case (4) inner chamber and fixedly connected with pressure head, lower support electric telescopic link (702) fixed connection be in conveyer (1) middle part is located press embryo workstation (2) below, the vertical up and fixedly connected with backup pad of flexible end of lower support electric telescopic link (702), lower support electric telescopic link (702) are located under last piezoelectricity telescopic link (701).

6. The apparatus for manufacturing a poly lactic acid billet according to claim 1, wherein: press discharging device (8) including fixed connection in ejection of compact electric telescopic rod (801) at cold-blast box (5) top, the flexible end of ejection of compact electric telescopic rod (801) is vertical to be stretched into downwards in cold-blast box (5) inner chamber and fixedly connected with press head (802), press and be the notch in the middle of scraping head (802) lower surface, both ends fixedly connected with extend and press clamp plate (803), press and scrape head (802) lower surface notch side fixedly connected with scraper blade (804), the mouth of a river (805) has been seted up on scraper blade (804).

7. The apparatus for manufacturing a poly lactic acid billet according to claim 1, wherein: spray set (11) including placing water pump (1101) in basin (12), water pump (1101) are connected with shower head (1102) and oblique shower head (1103) through the pipeline intercommunication, shower head (1102) fixed connection press down discharging device (8) left cold wind box (5) top, oblique shower head (1103) fixed connection press down discharging device (8) right side cold wind box (5) top and slope orientation press down discharging device (8) with pressing embryo workstation (2) and press the contact position.

8. The apparatus for manufacturing a poly lactic acid billet according to claim 7, wherein: the water tank (12) is divided into a water collecting cavity (1201) with an opening in the upper part and a water purifying cavity (1202) with a sealing cover in the upper part, the water collecting cavity (1201) and the water purifying cavity (1202) are divided by a filter screen (1203), and the water pump (1101) is positioned in the water purifying cavity (1202).

Technical Field

The invention relates to the technical field of polylactic acid blank production, in particular to equipment for preparing a polylactic acid blank.

Background

Polylactic acid is a polymer obtained by polymerizing lactic acid as a main raw material, also called polylactide, and belongs to the polyester family. Polylactic acid has good thermal stability and good solvent resistance and can be processed in various ways, such as extrusion, spinning, biaxial stretching, and injection blow molding. The product made of polylactic acid can be biodegraded, and has good biocompatibility, glossiness, transparency, hand feeling and heat resistance, and also has certain antibacterial property, flame retardance and ultraviolet resistance, so the polylactic acid has wide application, can be used as packaging materials, fibers, non-woven fabrics and the like, and is mainly used in the fields of clothing (underwear and outer clothing), industry (building, agriculture, forestry and paper making), medical sanitation and the like.

Polylactic acid has high safety to human body and can be absorbed by tissues, and in addition, the polylactic acid has excellent physical and mechanical properties, and can also be applied to the field of biological medicine, such as disposable transfusion tools, non-dismantling surgical sutures, drug release packaging agents, artificial fracture internal fixation materials, tissue repair materials, artificial skin and the like. The polylactic acid with high molecular weight has very high mechanical property, is used for replacing stainless steel in Europe and America and other countries, is used in large quantity as a novel orthopedic internal fixing material such as bone nails and bone plates, and has the characteristic of being absorbed and metabolized by human bodies so that patients do not suffer from secondary operation. The polymer material has high technical added value and is a polymer material with development prospect in the medical industry. However, polylactic acid formed by a common plastic molding process has low mechanical property, particularly bending strength and impact strength which can not meet the requirements of use in many occasions, and cannot be used for manufacturing fracture internal fixation devices.

The polylactic acid is processed and formed by the self-reinforcing technology, the chemical compositions of the reinforcing phase and the base phase are completely the same, no interface of the reinforcing phase and the base phase on the chemical structure exists, and a product with higher mechanical strength can be obtained under the condition of not introducing other reinforcing materials, so the polylactic acid is formed by the self-reinforcing technology and is an ideal method for researching and developing the polylactic acid as a medical material. The processing and production of the polylactic acid blank can obtain a more ideal blank by forging and pressing.

Disclosure of Invention

In view of the problems in the prior art, the invention discloses equipment for preparing polylactic acid blank, which adopts the technical scheme that the equipment comprises a conveying device, wherein the conveying device is of a chain conveying structure, a chain wheel is driven to rotate by a driving motor, two chains are arranged on the chain wheel in a transmission fit manner, the chains are positioned at two sides of the conveying device, positioning chutes are formed in the two side surfaces of the conveying device at equal intervals on the outer ring of the chains, blank pressing working tables are fixedly connected on the chains at equal intervals, the blank pressing working tables are slidably clamped in the positioning chutes and can circularly transmit along with the chains, the conveying device is divided into four stations from left to right, photoelectric proximity switches are fixedly arranged at the top positions of the side walls of the conveying device corresponding to the stations, the four photoelectric proximity switches are distributed at equal intervals, the stop positions of the blank pressing working tables at the four stations are calibrated by the four photoelectric proximity switches, so that the blank pressing working tables can circularly move on the conveying device under the driving of the chains, the device sequentially passes through four stations, namely a feeding station, a heating melting station, a forging and pressing forming station and an unloading station, and completes the processing of primary blank materials, a storage tank, a baking box and a cold air box are sequentially arranged above a conveyer from left to right and respectively correspond to the four stations, an electromagnetic valve is arranged at a discharge port of the storage tank, the baking box is also fixedly connected at the middle position below the conveyer, the upper baking box and the lower baking box correspond to each other, the lower baking box can be used for drying an unloaded blank pressing workbench, the two ends of the baking box and the two ends of the cold air box are communicated, the blank pressing workbench can penetrate through the baking box, a filter pressing device and a forging and pressing forming device are fixedly arranged at the top of the baking box above the conveyer, a pressing and discharging device is fixedly arranged at the middle position of the top of the cold air box, and the storage tank, the filter pressing device, the forging and pressing forming device and the pressing and discharging device respectively correspond to four photoelectric proximity switches one by one, the left and the right of a baking box above a conveying device are divided into a heating area and a hot air heat preservation area, an electric heating pipe is arranged in an inner cavity of the heating area of the baking box, a filter pressing device is positioned in the heating area of the baking box, the top of the hot air heat preservation area of the baking box is connected with a hot air device through a pipeline, a forging and forming device is positioned in the hot air heat preservation area of the baking box, the hot air device is also connected with the baking box below the conveying device through a pipeline, the hot air device generates hot air through a hot air blower and blows the hot air into the baking box through a pipeline, the tops of two ends of a cold air box are connected with a cold air device through a pipeline, the cold air device generates cold air through a cold air blower and blows the cold air into the cold air box through a pipeline, the middle position of the top of the cold air box is connected with a spraying device through a pipeline, water outlets of the spraying device are positioned on the left and the right sides of a pressing discharging device, and the middle part of the conveying device between the forging and the pressing discharging device is provided with a material collecting notch, sliding fit has placed the collection drawer in the notch that gathers materials, fashioned stock drops from pressing the embryo workstation after through pressing discharging device effect alright fall into in collecting the drawer, the small opening has been seted up on the collection drawer bottom surface, the rivers play of the drawer of being convenient for get into, the basin has been placed to spray set and collection drawer corresponding conveyer's right-hand member below, spray set spun water can finally flow to the basin in through the filtration back by spray set reuse, conveyer, the solenoid valve on the storage tank, the electrothermal tube, the filter-pressing device, forge and press forming device, press discharging device, the hot air blast apparatus, the cold wind device, spray set, photoelectricity proximity switch respectively with electrical system electric connection.

As a preferred scheme of the invention, the embryo pressing workbench comprises a front supporting rod and a rear supporting rod which are parallel to each other and fixedly connected to a chain, two ends of the front supporting rod and the rear supporting rod are slidably buckled in a positioning chute, the upper surface of the front supporting rod is fixedly connected to the front end of a base, a chute is arranged in the middle of the upper surface of the rear end of the base to facilitate the embryo materials to slide off the embryo pressing workbench, a movable cavity is arranged at the lower part of the rear end, the rear supporting rod passes through the movable cavity, the rear supporting rod is not connected with the base to support the base, the base can move relative to the rear supporting rod when the base moves to the end part of a conveying device, the embryo pressing workbench is prevented from being clamped at the end part of the conveying device and cannot move, one end of the upper surface of the front supporting rod, which is close to a photoelectric proximity switch assembly, so that the movement stop position of the embryo pressing workbench can be calibrated, and an installation cavity is arranged in the center of the upper surface of the base, the kicking block is installed through screw-thread fit in installation cavity bottom, and four shrink chambeies have been seted up all around to the installation cavity on the base upper surface, through screw fixedly connected with forming die in the shrink chamber, forming die slides and pegs graft in the installation cavity, and the kicking block slides and pegs graft in forming die, forming die and kicking block convenient to detach to convenient to detach maintains or changes different moulds.

As a preferred scheme of the invention, the forming die is cross-shaped, the die cavity is arranged in the middle of the forming die, the edge of an opening at the upper end of the die cavity is provided with an inclined chamfer, thereby facilitating feeding in the die cavity, facilitating a filter pressing device and a forging and pressing device to extend into the die cavity, the top block is inserted at the bottom of the die cavity in a sliding manner, one side of the upper surface of the forming die, which is close to the chute, is provided with a discharging chute, so that a blank coming out of the die cavity can slide from the discharging chute, four springs are fixedly connected below the periphery of the forming die, the lower ends of the springs are fixedly connected with threaded connection plates, the springs are arranged in the contraction cavity in a one-to-one correspondence manner, and the screws are connected on the threaded connection plates in a threaded manner.

As a preferred scheme of the invention, the filter pressing device comprises a filter pressing electric telescopic rod fixedly connected with the top of the baking oven, the telescopic end of the filter pressing electric telescopic rod vertically extends downwards into an inner cavity of the baking oven and is fixedly connected with a filter pressing head, the shape of the filter pressing head is the same as that of an opening of a die cavity and can be attached to the inner wall of the die cavity to enter, the lower surface of the filter pressing head is a plane, the upper surface of the lower surface of the filter pressing head is an arc surface, filter holes are formed in the upper surface of the filter pressing head, so that molten polylactic acid in the polylactic acid can be filter-pressed, undissolved particulate matters in the polylactic acid are pressed to the bottom, the telescopic end of the filter pressing electric telescopic rod slides to penetrate through a dredging seat, a mounting hole is formed in the dredging seat and is fixedly mounted at the top of the inner cavity of the baking oven through a screw, a steel needle is fixedly connected to the middle position of the lower surface of the dredging seat, limiting plates are fixedly connected to the side edges, the steel needles correspond to the filter holes in one-to one in the filter pressing head, the filter pressing head slides to be clamped between the limiting plates, the polylactic acid that the arcwall face of its upper surface is convenient for dissolve after the filter-pressing head lifts up flows and breaks away from, and the limiting plate guarantees that the filter-pressing head is stable the lifting and makes the steel needle can prick the overhead hole of filter-pressing, clears up the filter-pressing head.

As a preferred scheme of the invention, the forging and pressing forming device comprises an upper piezoelectric telescopic rod and a lower supporting telescopic rod, the upper piezoelectric telescopic rod is fixedly connected to the top of a baking box above a conveying device, the telescopic end of the upper piezoelectric telescopic rod vertically extends downwards into an inner cavity of the baking box and is fixedly connected with a pressure head, the pressure head is attached to the inner wall of a die cavity and enters the die cavity to forge and press polylactic acid in the upper piezoelectric telescopic rod, the lower supporting telescopic rod is fixedly connected to the middle of the conveying device and is positioned below an embryo pressing workbench, the telescopic end of the lower supporting telescopic rod vertically faces upwards and is fixedly connected with a supporting plate, the lower supporting telescopic rod is positioned right below the upper piezoelectric telescopic rod, the embryo pressing workbench can be supported by the supporting plate, and damage to the embryo pressing workbench in the downward forging and pressing process of the upper piezoelectric telescopic rod is avoided.

According to a preferable scheme of the invention, the pressing and discharging device comprises a discharging electric telescopic rod fixedly connected to the top of the cold air box, the telescopic end of the discharging electric telescopic rod vertically extends downwards into an inner cavity of the cold air box and is fixedly connected with a pressing scraping head, a notch is formed in the middle of the lower surface of the pressing scraping head, extension pressing plates are fixedly connected to two ends of the pressing electric telescopic rod, pressing on a forming die is guaranteed through the extension pressing plates, a scraping plate is fixedly connected to one side surface of the notch in the lower surface of the pressing scraping head, a water passing port is formed in the scraping plate, and a blank which is positioned out of a die cavity by the ejector block can be pushed out and fall by the scraping plate.

According to a preferred scheme of the invention, the spraying device comprises a water pump placed in a water tank, the water pump is connected with a spraying head and an oblique jet head through a pipeline in a communicating manner, the spraying head is fixedly connected to the top of a cold air box on the left side of the pressing and discharging device, the spraying head sprays water to cool an embryo pressing workbench conveyed into the cold air box so as to cool and solidify the embryo, the oblique jet head is fixedly connected to the top of the cold air box on the right side of the pressing and discharging device and obliquely points to the pressing and discharging device and the embryo pressing workbench in a pressing contact position, and in the process that the pressing and discharging device presses the forming die, the oblique jet head can directly spray water to the embryo, so that the forming die can be cleaned while the embryo is cooled.

As a preferred scheme of the invention, the water tank is divided into a water collecting cavity with an opening at the upper part and a water purifying cavity with a sealing cover at the upper part, the water collecting cavity and the water purifying cavity are divided by a filter screen, the water pump is positioned in the water purifying cavity, water sprayed out of the spraying device finally flows into the collecting cavity, enters the water purifying cavity after being filtered by the filter screen, and then is pumped into the spraying device by the water pump for cooling.

The invention has the beneficial effects that: the invention designs a production line type polylactic acid blank production device, which can obtain the polylactic acid blank by using polylactic acid powder as a raw material through the working procedures of charging, hot-melt press filtration, forging and pressing molding, cooling and discharging, wherein a chain transmission structure is adopted, and a blank pressing worktable is uniquely designed, so that the blank pressing worktable can easily turn around and cannot be blocked on a transmission device, meanwhile, the blank pressing worktable is more stably and accurately transmitted, a forming die is convenient to disassemble, different dies can be replaced according to needs, and a spring structure of the forming die is matched with an ejector block, so that the demoulding of the formed blank is facilitated, and the equipment structure and the working flow are simplified.

In addition, the designed filter pressing device can effectively press infusible substances in the polylactic acid in a molten state to the bottommost part, so that the later treatment is facilitated, and the purity of the blank main body is ensured; the forging and pressing forming device can forge and press the blank, so that the prepared polylactic acid blank has better mechanical property; the baking oven, the hot air device, the cold air device and the spraying device which are integrally configured can effectively complete the heating melting, heat preservation and cooling molding work of the polylactic acid raw material, so that the molding of the polylactic acid blank has a more controllable temperature environment, and meanwhile, the whole device can complete the cleaning and drying work of the blank pressing workbench, so that the blank pressing workbench can be recycled, and the whole device has higher production efficiency.

Drawings

FIG. 1 is a first view of the overall structure of the present invention;

FIG. 2 is a second view of the overall structure of the present invention;

FIG. 3 is a cross-sectional view of the internal structure of the present invention;

FIG. 4 is a sectional view of a collection drawer portion of the transfer device of the present invention;

FIG. 5 is a half sectional view of the structure of the preform pressing table of the present invention;

FIG. 6 is a schematic structural view of a molding die of the present invention;

FIG. 7 is a schematic view of the filter press apparatus of the present invention;

FIG. 8 is a schematic view of a filter press head according to the present invention;

FIG. 9 is a schematic view of a pressing and discharging device according to the present invention

FIG. 10 is a schematic view of the spraying device and water tank of the present invention

FIG. 11 is a schematic view of a collection drawer according to the present invention.

In the figure: 1 conveying device, 101 driving motors, 102 chain wheels, 103 chains, 104 material collecting notches, 105 positioning chutes, 2 embryo pressing working tables, 201 front supporting rods, 202 rear supporting rods, 203 bases, 204 chutes, 205 proximity switch assemblies, 206 forming dies, 2061 die cavities, 2062 bevel chamfers, 2063 discharging chutes, 2064 springs, 2065 threaded connecting plates, 207 top blocks, 208 movable cavities, 209 installation cavities, 210 contraction cavities, 211 screws, 3 storage tanks, 4 baking boxes, 401 electric heating pipes, 5 cold air boxes, 6 filter pressing devices, 601 filter pressing electric telescopic rods, 602 filter pressing heads, 603 dredging seats, 604 steel needles, 605 limiting plates, 606 installation holes, 7 forging and forming devices, 701 upper piezoelectric rods, 702 lower supporting electric telescopic rods, 8 pressing and discharging devices, 801 discharging electric telescopic rods, 802 pressing scraping heads, extension 803 pressing plates, 804 scraping plates, 805 water outlets, 9 hot air devices, 10 cold air devices, 11 spraying devices, 1101 water pump, 1102 spray header, 1103 inclined spray head, 12 water tank, 1201 water collecting cavity, 1202 purified water cavity, 1203 filter screen, 13 electric control system, 14 collecting drawer, 1401 leak hole and 15 photoelectric proximity switch.

Detailed Description

Example 1

As shown in fig. 1 to 11, the equipment for preparing polylactic acid blank of the present invention adopts the technical scheme that a conveying device 1 with a chain conveying structure is adopted, the conveying device 1 drives a chain wheel 102 to rotate through a driving motor 101, two chains 103 are installed on the chain wheel 102 in a transmission fit manner, the chains 103 are located at two sides of the conveying device 1, positioning chutes 105 are formed in the outer rings of the chains 103 at equal intervals on two sides of the conveying device 1, embryo pressing tables 2 are fixedly connected with the chains 103 at equal intervals, the embryo pressing tables 2 are slidably buckled in the positioning chutes 105 and can circularly drive along with the chains 103, the conveying device 1 is divided into four stations from left to right, photoelectric proximity switches 15 are fixedly installed at the top positions of the side walls of the conveying device 1 corresponding to each station, the four photoelectric proximity switches 15 are distributed at equal intervals, the stopping positions of the embryo pressing tables 2 at the four stations are calibrated through the four photoelectric proximity switches 15, thereby make press embryo workstation 2 at conveyor 1 upward cyclic motion under the drive of chain 103, and in proper order through reinforced station, the heating and melting station, forge and press the shaping station and unload these four stations of station, accomplish the processing of a stock, conveyor 1 top is from a left side to the right side and is installed storage tank 3 in proper order, bake out case 4, cold wind case 5, correspond four stations respectively, the solenoid valve is installed to the discharge gate of storage tank 3, conveyor 1 below intermediate position also fixedly connected with bakes out case 4, two upper and lower bakes out case 4 correspondingly, bake out case 4 that utilizes the below can dry press embryo workstation 2 after unloading, bake out case 4 and cold wind case 5 both ends all link up, press embryo workstation 2 to pass wherein. The top of the baking box 4 above the conveying device 1 is fixedly provided with a filter pressing device 6 and a forging and pressing forming device 7.

The middle position of the top of the cold air box 5 is fixedly provided with a pressing discharging device 8, a storage tank 3, a filter pressing device 6, a forging and pressing forming device 7 and the pressing discharging device 8 are respectively in one-to-one correspondence with four photoelectric proximity switches 15, the left and right parts of a baking box 4 above a conveyer 1 are divided into a heating area and a hot air heat preservation area, an electric heating pipe 401 is arranged in the inner cavity of the heating area of the baking box 4, the filter pressing device 6 is positioned in the heating area of the baking box 4, the top of the hot air heat preservation area of the baking box 4 is communicated and connected with a hot air device 9 through a pipeline, the forging and pressing forming device 7 is positioned in the hot air heat preservation area of the baking box 4, the hot air device 9 is also connected to the baking box 4 below the conveyer 1 through a pipeline, the hot air device 9 generates hot air through a hot air blower and blows into the baking box 4 through a pipeline, the tops of two ends of the cold air box 5 are communicated and connected with a cold air device 10 through a pipeline, the cold air device 10 generates cold air through a cold air blower and blows the cold air into the cold air box 5 through a pipeline, the middle position of the top of the cold air box 5 is communicated and connected with a spraying device 11 through a pipeline, water outlets of the spraying device 11 are positioned at the left side and the right side of a pressing discharging device 8, a material collecting notch 104 is formed in the middle of a conveying device 1 between a forging forming device 7 and the pressing discharging device 8, a collecting drawer 14 is placed in the material collecting notch 104 in a sliding fit mode, a formed blank falls off from a blank pressing workbench 2 under the action of the pressing discharging device 8 and then falls into the collecting drawer 14, a leakage hole 1401 is formed in the bottom surface of the collecting drawer 14, water entering the drawer can conveniently flow out, a water tank 12 is placed below the right end of the conveying device 1 corresponding to the spraying device 11 and the collecting drawer 14, and the water sprayed by the spraying device 11 can finally flow into the water tank 12 to be filtered and then be reused by the spraying device 11, the conveying device 1, the electromagnetic valve on the material storage tank 3, the electric heating tube 401, the filter pressing device 6, the forging and pressing forming device 7, the pressing and discharging device 8, the hot air device 9, the cold air device 10, the spraying device 11 and the photoelectric proximity switch 15 are respectively electrically connected with the electric control system 13, and the electric control system 13 controls the whole device.

The embryo pressing workbench 2 comprises a front supporting rod 201 and a rear supporting rod 202 which are parallel to each other and fixedly connected to a chain 103, two ends of the front supporting rod 201 and the rear supporting rod 202 are slidably buckled in a positioning chute 105, the upper surface of the front supporting rod 103 is fixedly connected to the front end of a base 203, a chute 204 is arranged in the middle of the upper surface of the rear end of the base 203, so that a blank can slide down and fall off the embryo pressing workbench 2, a movable cavity 208 is arranged at the lower part of the rear end, the rear supporting rod 202 penetrates through the movable cavity 208, the rear supporting rod 202 is not connected with the base 203 and plays a supporting role, the base 203 can move relative to the rear supporting rod 202 when the end part of a conveying device 1 is moved, the phenomenon that the embryo pressing workbench 2 is clamped at the end part of the conveying device 1 and cannot move is avoided, one end, close to a photoelectric proximity switch assembly 205, close to the photoelectric proximity switch 15, of the upper surface of the front supporting rod 201, so that the movement stop position of the embryo pressing workbench 2 can be calibrated, the center of the upper surface of the base 203 is provided with a mounting cavity 209, the bottom of the mounting cavity 209 is provided with a top block 207 through screw thread matching, the upper surface of the base 203 is provided with four shrinkage cavities 210 around the mounting cavity 209, the shrinkage cavities 210 are fixedly connected with a forming die 206 through screws 211, the forming die 206 is inserted in the mounting cavity 209 in a sliding way, the forming die 206 is cross-shaped, the middle of the forming die is provided with a die cavity 2061, the edge of the upper end opening of the die cavity 2061 is provided with a bevel chamfer 2062, thereby facilitating charging in the die cavity 2061 and extending the pressure filter device 6 and the forging and pressing forming device 7 into the die cavity 2061, the top block 207 is inserted at the bottom of the die cavity 2061 in a sliding way, one side of the upper surface of the forming die 206 close to the chute 204 is provided with a discharging chute 2063, so that a blank material coming out from the die cavity 2061 can slide from the discharging chute 2063, four springs 2064 are fixedly connected below the periphery of the forming die 206, the lower end of the spring 2064 is fixedly connected with a screw thread connecting plate 2065, the springs 2064 are installed in the contraction cavity 210 in a one-to-one correspondence, the screws 211 are screwed on the screw connection plates 2065, and the forming die 206 and the top block 207 are easily disassembled, thereby facilitating disassembly for maintenance or replacement of different dies.

The filter pressing device 6 comprises a filter pressing electric telescopic rod 601 fixedly connected to the top of the baking oven 4, the telescopic end of the filter pressing electric telescopic rod 601 vertically extends downwards into the inner cavity of the baking oven 4 and is fixedly connected with a filter pressing head 602, the shape of the filter pressing head 602 is the same as the opening shape of the die cavity 2061 and can be attached to the inner wall of the die cavity 2061, the lower surface of the filter pressing head 602 is a plane, the upper surface of the plane is an arc surface and is provided with filter holes, so that molten polylactic acid can be subjected to filter pressing, undissolved particulate matters are pressed to the bottom, the telescopic end of the filter pressing electric telescopic rod 601 slides to penetrate through the dredging seat 603, the dredging seat 603 is provided with mounting holes 606 and is fixedly arranged at the top of the inner cavity of the baking oven 4 through screws, the middle position of the lower surface of the dredging seat 603 is fixedly connected with steel needles 604, the side edges are fixedly connected with limiting plates 605, the steel needles 604 correspond to the filter holes on the filter pressing head 602 one to one another, and the filter pressing head 602 slides to be buckled between the limiting plates 605, after the filter pressing head 602 is lifted, the arc-shaped surface of the upper surface of the filter pressing head is convenient for the melted polylactic acid to flow and separate, and the limiting plate 605 ensures that the filter pressing head 602 is stably lifted so that the steel needle 604 can be inserted into the hole on the filter pressing head 602 to clean the filter pressing head 602.

Forging and pressing forming device 7 includes piezoelectricity telescopic link 701 and lower support electric telescopic link 702, go up 4 tops of toasting case and its flexible end of piezoelectricity telescopic link 701 fixed connection in the 1 top of conveyer and the vertical downwardly extending toasts 4 inner chambers of case and fixedly connected with pressure head, the pressure head is laminating the inner wall of die cavity 2061 and is entering into die cavity 2061, can forge and press polylactic acid wherein, lower support electric telescopic link 702 fixed connection is in 1 middle part of conveyer and is located blank workstation 2 below, the flexible end of lower support electric telescopic link 702 is vertical up and fixedly connected with backup pad, lower support electric telescopic link 702 is located piezoelectric telescopic link 701 under, utilize the backup pad to support blank workstation 2, avoid going up piezoelectric telescopic link 701 and forge and press the in-process down to cause destruction to blank workstation 2.

Pressing discharging device 8 includes ejection of compact electric telescopic rod 801 of fixed connection at cold air box 5 top, ejection of compact electric telescopic rod 801's flexible end is vertical to be stretched into in the cold air box 5 inner chamber downwards and fixedly connected with presses scraping head 802, press and be the notch in the middle of scraping head 802 lower surface, both ends fixedly connected with extend and press pressing plate 803, guarantee pressing to forming die 206 through extending pressing plate 803, press and scrape a first 802 lower surface notch side fixedly connected with scraper blade 804, the mouth of a river 805 has been seted up on scraper blade 804, utilize scraper blade 804 can be released the billet of being decided die cavity 2061 by kicking block 207 and drop.

The water tank 12 is divided into a water collecting cavity 1201 with an opening at the upper part and a water purifying cavity 1202 with a sealing cover at the upper part, the water collecting cavity 1201 and the water purifying cavity 1202 are divided by a filter screen 1203, the spray device 11 comprises a water pump 1101 placed in the water purifying cavity 1202, the water pump 1101 is communicated and connected with a spray header 1102 and an oblique injection head 1103 through pipelines, the spray header 1102 is fixedly connected to the top of a cold air box 5 at the left side of a pressing and discharging device 8, the spray header 1102 sprays water to cool a pressing and discharging workbench 2 conveyed into the cold air box 5 so as to cool and solidify a blank, the oblique injection head 1103 is fixedly connected to the top of the cold air box 5 at the right side of the pressing and discharging device 8 and obliquely points to the pressing and discharging device 8 and the pressing and contacting position of the pressing and discharging workbench 2, in the process of pressing the forming die 206 by the pressing and discharging device 8, the oblique-jet head 1103 can directly spray water to the blank, so that the forming die 206 can be cleaned while the blank is cooled. The water sprayed from the spray device 11 finally flows into the collection chamber 1201, is filtered by the filter screen 1203 and enters the clean water chamber 1202, and is then pumped by the water pump 1101 into the spray device 11 for cooling.

The working principle of the invention is as follows: polylactic acid powder is stored in a storage tank 3, an electric control system 13 controls the opening and closing of an electromagnetic valve on the storage tank 3, so as to control the storage tank 3 to release the powder, a conveyer 1 drives a blank pressing workbench 2 to move to the lower part of the storage tank 3, the position of the blank pressing workbench 2 is determined through the matching of a photoelectric proximity switch 15 and a proximity switch assembly 205, a forming mold 206 is higher than a base 203 under a normal state, a top block 207 is positioned at the bottom of a mold cavity 2061, so as to enable the powder to be filled into the mold cavity 2061, then the conveyer 1 drives the blank pressing workbench 2 to move into a baking box 4 and stop below a filter pressing device 6, the powder is melted through the heating of an electric heating pipe 401, then a filter pressing electric telescopic rod 601 pushes a filter pressing head 602 to downwards into the mold cavity 2061 and slowly press the non-melted impurities into the melted polylactic acid, the non-melted impurities are pressed to the bottommost, and a hole of the filter pressing head 602 can enable the melted polylactic acid to pass, the arc surface of the upper surface enables polylactic acid to flow downwards to be separated from the filter-pressing head 602 in the lifting process, the filter-pressing head 602 is lifted out of the die cavity 2061 and then lifted under the limitation of the limiting plate 605, so that the steel needle 604 can be correspondingly inserted into the hole of the filter-pressing head 602, the filter-pressing head 602 is dredged and cleaned, the polylactic acid is melted and filter-pressed, the conveying device 1 drives the blank-pressing workbench 2 to move below the forging and pressing forming device 7, the lower support electric telescopic rod 702 extends to be propped against the bottom of the blank-pressing workbench 2, the upper piezoelectric telescopic rod 701 extends to enter the die cavity 2061, the polylactic acid is forged and pressed, the temperature of the hot air insulation area of the baking box 4 is controlled by controlling the blowing temperature of the hot air device 9 in the process, the forging and pressing of the polylactic acid are facilitated, the upper piezoelectric telescopic rod 701 and the lower support electric telescopic rod 702 contract after the forging and then the blank-pressing workbench 2 moves into the air cooling box 5, the cold air blown out by the cold air device 10 and the water sprayed by the spraying device 11 cool the blank pressing workbench 2 and the blank, then the blank pressing workbench 2 stays under the pressing and discharging device 8, the discharging electric telescopic rod 801 extends to press the pressing scraping head 802 to the upper surface of the forming mold 206, the forming mold 206 is pressed downwards, so that the top block 207 pushes the cooled blank out of the mold cavity 2061, then the conveying device 1 drives the blank pressing workbench 2 to move, the pressing of the forming mold 206 is ensured by extending the pressing plate 803, so that the blank is scraped from the top of the forming mold 206 by the scraping plate 804, the blank slides along the discharging chute 2063 and slides into the collecting drawer 14 below after passing through the chute 204, and the oblique injection head 1103 is obliquely arranged, water can be directly injected to the blank through the water through opening 8005, the forming mold 206 can be cleaned while being cooled, the sprayed water flows downwards and finally flows back into the water tank 12, enters the collecting cavity 1201 firstly, enters the purified water cavity 1202 after being filtered by the filter screen 1203, and then is pumped into the spraying device 11 by the water pump 1101 for cooling. The blank pressing workbench 2 after discharging is continuously conveyed by the conveying device 1, the forming die 206 is recovered to the original position under the action of the spring 2064 after being separated from the extending pressing plate 803, the blank pressing workbench 2 moves to the lower part of the conveying device 1, and returns to the lower part of the storage tank 3 after being dried by the baking box 4 at the lower part, and blank manufacturing is continuously carried out. The blank collected in the collection drawer 14 is simply processed after being taken out, and the part containing impurities at the lower end is removed.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the invention, and further, the terms "first", "second", etc., are used only for descriptive purposes and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated, whereby the features defined as "first", "second", etc., may explicitly or implicitly include one or more of such features, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, and the two elements may be communicated with each other, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art through specific situations.

Components and circuit connections not described in detail herein are prior art.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.