CN113134964A

CN113134964A - Plastic sheet forming machine

Info

Publication number: CN113134964A
Application number: CN202010063355.0A
Authority: CN
Inventors: 李晶晶
Original assignee: Wenzhou Mingli Machinery Co ltd
Current assignee: Wenzhou Mingli Machinery Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2021-07-20

Abstract

The invention relates to the field of plastic forming equipment, and discloses a plastic sheet forming machine, which comprises the forming equipment, wherein the forming equipment comprises a transmission structure, the transmission structure comprises a first guide pillar, a transmission shaft and a driving device in transmission connection with the transmission shaft, a first upper die plate and a first lower die plate are slidably mounted on the first guide pillar, and the transmission shaft is in transmission connection with the first upper die plate and the first lower die plate; the blanking equipment comprises a waste removing mechanism and the forming equipment also comprises a fine adjustment device for the position of the die disc. The structure realizes die opening and die closing through a power source, so that the structure of the machine is more compact, the fine adjustment device realizes accurate positioning and continuous motion control, the problem that plastic sheets are difficult to clean is solved by waste collection, the cleanness and attractiveness of the workbench are ensured, and the working efficiency of workers is improved.

Description

Plastic sheet forming machine

Technical Field

The invention relates to the field of plastic molding equipment, in particular to a plastic sheet molding machine.

Background

The plastic products such as the beverage cup cover, the coffee cup cover, the medicine and food tray and the like are molded and manufactured by the method that a cylinder of plastic thin sheet is placed on a feeding frame, the plastic thin sheet is softened by a heating device, then is subjected to blow molding in a blow molding device, and finally is cut and molded by a punching and cutting device and finally is sent out. In the forming process, the upper die and the lower die need a power source to realize driving respectively, different dies need to be replaced for different products, so that the closed height of the upper die and the closed height of the lower die are subjected to position adjustment, the general structure is manually adjusted through nuts on the first guide pillars, but the stroke is difficult to control in the operation process, the adjustment is not accurate, four first guide pillars are generally arranged, the adjustment is needed, the die disc is difficult to control horizontally, and the height adjustment can be completed through multiple times of adjusting operation. Although the structure is simple, the equipment cost is high, the production efficiency is low, the product cost is high, the product precision is low, and the rejection rate is high. However, the operation is complicated, and manpower and time are wasted, so that the production efficiency is low, the product cost is increased, the product precision is low, and the rejection rate is high.

The following processes need to punch holes in plastic products, the cleanliness of a punching machine is very high in the actual operation process, plastic products, particularly plastic sheet products, are soft, light and thin and have slight stickiness, a large amount of waste materials are frequently generated on a worktable, and the waste materials on the worktable are always scattered by external force, so that a large amount of time and energy are consumed for cleaning the waste materials on the worktable. Furthermore, uncleaned countertops are quite unsightly, and a device is needed to solve this problem.

Disclosure of Invention

The invention aims at the problems and provides a transmission structure of a plastic sheet forming machine.

The purpose of the invention is realized as follows:

a plastic sheet forming machine comprises a forming device, wherein the forming device comprises a transmission structure, the transmission structure comprises a first guide pillar, a transmission shaft and a driving device in transmission connection with the transmission shaft, a first upper die plate and a first lower die plate are slidably mounted on the first guide pillar, and the transmission shaft is in transmission connection with the first upper die plate and the first lower die plate; the method is characterized in that: the transmission shaft is a crankshaft, the crankshaft is connected with the first upper die plate and the first lower die plate through a first transmission rod and a second transmission rod respectively, the crankshaft is connected with the first transmission rod and the second transmission rod through shaft hubs, and a connecting curved surface of the crankshaft and the first transmission rod and a connecting curved surface of the crankshaft and the second transmission rod are arranged on the same crankshaft in a staggered mode. The driving device is a stepping motor or a speed reducer or a servo motor, and the motor is adjusted according to the requirement of precision. The transmission mode has large transmission ratio, so that the equipment has compact structure, small volume and light weight, can obtain large transmission ratio and is beneficial to reducing production and operation cost.

Preferably, the blanking equipment comprises a waste rejecting mechanism, the waste rejecting mechanism comprises a mounting seat, a second guide pillar, a second upper die disc and a second lower die disc are arranged on the mounting seat, the second upper die disc and the second lower die disc are slidably arranged on the second guide pillar, punching dies are arranged on the second upper die disc and the second lower die disc, the collecting device comprises a hopper arranged on the second lower die disc, a collecting container is correspondingly arranged below the hopper, and an opening of the collecting container is opposite to a discharge port of the hopper. The problem of plastic sheet be difficult to the clearance is solved, guarantee the clean and tidy pleasing to the eye of workstation, be convenient for clear up and clean, reduced the cleaning work to the device, improved workman's work efficiency. The working process of the equipment is that the plastic thin sheet is placed between a punching needle and a punching female die through traction after being formed; and driving the upper die plate and the lower die plate to move relatively, executing the punching operation of the program, and enabling the waste materials to fall into the bottom of the guide channel in a matched manner to be discharged, enter the hopper and then fall into the collection container to be collected. Collect the unified waste material of handling behind a certain amount of waste material, greatly increased the convenience of operation. The below also can be equipped with a plurality of power supplies, makes second lower die disc atress even, and the equipment position of punching a hole of a power supply among the prior art is more accurate, does not need extra space to accomplish garbage collection, makes equipment neater compact.

Preferably, the molding equipment further comprises a mold disc position fine-adjustment device, the mold disc position fine-adjustment device comprises a support for installing the mold disc, the mold disc can move on the support, a screw rod is sleeved on the support and is in threaded connection with the mold disc, and the screw rod is in transmission connection with a power source. The power supply drives the input shaft and rotates, and the screw rod of lead screw is owing to cooperate with the nut when rotating, has the trend of upward or downstream, and the screw rod horizontal direction is fixed, and the nut on the screw rod is fixed with first last template, drives the direction motion opposite to the motion trend rather than fixed first last template, through specific design, the elasticity of control drive belt has made things convenient for the debugging of equipment in process of production, realizes the distance of motion of first last template of accurate realization. The die disc moves back and forth on the guide post, the position of the die disc is finely adjusted after the die is replaced or in other required time, the power source is started for adjustment, the bracket is driven to move on the guide post through transmission when the whole machine runs, and the die disc is further driven to operate through the screw rod to realize linkage.

Preferably, the molding device further comprises a base and a worm wheel which is matched with the crankshaft, and the first guide pillar is fixedly connected with the base. Compared with the traditional equipment, the mould opening and closing are realized through one power source, the production and maintenance cost of the instrument is greatly reduced, the structure of the machine is more compact, and the operation of accurate positioning and continuous motion control is more convenient. The driving device drives the worm to further drive the worm wheel to rotate so as to drive the crankshaft to rotate, the crankshaft is connected with the worm wheel, a first transmission rod and a second transmission rod which are connected with the first upper die plate and the first lower die plate are installed on the crankshaft through bearings, the first upper die plate and the first lower die plate are respectively driven to do vertical linear motion, and the motion directions of the first upper die plate and the first lower die plate are opposite. When the first lower die plate ascends, the first upper die plate descends, the first upper die plate ascends to the highest position and descends to the lowest position, and the first lower die plate is in a die closing state; when the first lower die plate descends, the first upper die plate ascends, the first lower die plate descends to the lowest position, and the first upper die plate ascends to the highest position, and the first lower die plate is in a die splitting state. The first transmission rod is arranged at two ends of the crankshaft, the second transmission rod is arranged on the inner side of the first transmission rod, the driving device drives the worm wheel to drive the crankshaft to synchronously rotate, and the crankshaft drives the first transmission rod and the second transmission rod to drive the first upper die plate and the first lower die plate to relatively slide on the first guide pillar.

Preferably, the first guide pillar is provided with a guide pillar guide sleeve, the guide pillar guide sleeve is sleeved on the first guide pillar and is fixedly connected with the first upper die plate, and the first upper die plate slides on the first guide pillar through the guide pillar guide sleeve.

The plastic sheet raw materials are placed on the blowing frame, the expansion is pulled by the traction equipment to the heating equipment for heating, the chain is driven by the servo motor through the transmission equipment, the fixed length is removed through the chain, the chains are arranged on two sides of the film, the spine is arranged on the chain and penetrates into the film, the chain moves to drive the film to move forwards, the heating equipment is sequentially arranged, the heating equipment is provided with an upper drying box and a lower drying box, the heating equipment is arranged to form, the punching equipment is arranged to cut the plastic sheets, the punching equipment is arranged as required, and products are subsequently output.

The lower surface of a first upper die plate of the forming device is fixedly provided with a forming die, and the upper surface of a first lower die plate is correspondingly and fixedly provided with an air blowing die; or the lower surface of the first upper die plate is fixedly provided with an air blowing die, and the upper surface of the first lower die plate is correspondingly and fixedly provided with a forming die. The working process of the equipment is that a plastic sheet is heated and softened by an oven and then is driven by a traction mechanism to enter a forming station, the plastic sheet is in a mold splitting state at the moment, a driving device is started to drive a first upper mold plate and a first lower mold plate to move to a mold closing state, at the moment, a blowing mold and a forming mold are folded to form a closed space with the plastic sheet and an inner cavity of the blowing mold, a lower stretching cylinder drives a plunger to move upwards, an upper inlet of the blowing mold enters at the right moment according to the air pressure, the softened plastic sheet is pushed into a mold cavity of the forming mold under the combined action of the plunger and the air pressure, air holes are formed in the mold cavity of the forming mold, the air pushed into the mold cavity along with the plastic sheet is removed, finally the plastic sheet is tightly attached to the mold cavity wall, the blowing valve is closed at the right moment, the forming air pressure is removed, a servo motor drives the upper mold and the lower mold to be in the mold splitting state, the shape of the plastic sheet is the inner cavity of the forming mold at the same as the shape of the forming mold at the moment, and finishing a molding cycle, wherein the air blowing mold is provided with an air cylinder connected with the air blowing mold. The cylinder that the mould of blowing is connected is equipped with on the first last diaphragm plate or below the first diaphragm plate, the mounting position can be exchanged with the mould of blowing according to the circumstances to the moulded die, install in first diaphragm plate or first last diaphragm plate, tensile cylinder in plunger installation one, the cylinder is always located on the diaphragm plate of the mould installation of blowing, go up behind the first diaphragm plate compound die, the cylinder drives the plunger activity, push away the material toward the shaping model intracavity, material laminating plunger is pushed the mould bottom and can assist the shaping, exhaust speed can be accelerated the shaping speed, make the shaping of plastic sheet fuller, the bottom thickness thickening of plastic sheet, the quality is better.

The lower surface of a first upper die plate of the blanking device is fixedly provided with a blanking die, and the upper surface of a first lower die plate is correspondingly and fixedly provided with a blanking knife; or the lower surface of the first upper die plate is fixedly provided with a stamping knife, and the upper surface of the first lower die plate is correspondingly and fixedly provided with a stamping knife die. The structure may also be used for mounting blanking dies. The cut coiled material is placed on a material placing frame, an unfolded sheet enters a traction mechanism through a turning mechanism, the traction mechanism is provided with a servo motor to drive a chain, the two sides of the sheet are provided with the chains, the chains are provided with sharp spines which pierce the sheet, the chains move to drive the sheet to move forward, the sheet sequentially enters an upper oven heating forming station, a punching station and a blanking station, after the heating softening forming punching is completed, the product is placed on a cutting lower die, a mechanical arm enters a grabbing and chopping code on a conveying belt, the number of the chopping code can be set, the conveying belt starts to output the product after the number of the chopping code is completed, and simultaneously, the waste edge after cutting is wound by a winding mechanism. After the forming is finished, the blowing is stopped, the lower die is driven by the motor to continuously move towards the upper die, and the cutter is moved to finish the punching of the sheet.

Compared with the prior art, the invention has the outstanding and beneficial technical effects that: the invention has compact structure, adopts a mode that one power source drives the upper die and the lower die to operate, is applied to forming and blanking equipment, has lower cost than the traditional mode that the upper die and the lower die are respectively provided with the power source, and is more reliable and stable because the same power source drives all the dies. The structure ensures the integral rigidity of the machine, the mounting position of the upper first lower die plate can be set according to products and dies with different specifications, and the upper limit of the load is different. Compared with the traditional equipment, the mould opening and closing are realized through one power source, the production and maintenance cost of the instrument is greatly reduced, the structure of the machine is more compact, and the operation of accurate positioning and continuous motion control is more convenient.

After the fine setting device has been increased to the device, rotate through the control linkage wheel and drive modes such as screw rod rotation and the elasticity of transmission piece, made things convenient for the debugging of equipment in process of production, realize the accurate position fine setting that realizes the mould dish, make add man-hour more accurate, improved the quality of product, reduced the rejection rate of product. When the whole machine needs to run in an empty state under the conditions of debugging, displaying and the like, the die disc is lifted through the die disc position fine adjustment device, so that the upper die and the lower die keep a distance after running, the load of the machine is reduced, the dies, particularly the cutter dies, are prevented from being abraded due to die assembly, and the service life of the whole die is prolonged.

The waste collecting device is added, the problem that plastic sheets are difficult to clean is solved in each process, the workbench is neat and attractive, cleaning and sweeping are facilitated, cleaning work of the device is reduced, and work efficiency of workers is improved.

Drawings

FIG. 1 is a schematic view of the structure of the molding apparatus of the present invention.

Fig. 2 is an isometric view of fig. 1.

Fig. 3 is a side view of fig. 1.

Fig. 4 is a front view of the blanking device of the invention.

Fig. 5 is an isometric view of fig. 4.

Fig. 6 is a schematic structural view of the inventive punching apparatus.

Fig. 7 is a front view of fig. 6.

Fig. 8 is a schematic structural diagram of the fine adjustment device of the present invention.

Fig. 9 is a side view of the fine adjustment device.

Fig. 10 is a partial enlarged view of a in fig. 8.

Fig. 11 is a partial enlarged view of B in fig. 8.

The names of the parts indicated by the numerical references in the above figures are as follows: 1-mounting seat, 2-base, 3-driving device, 4-first guide column, 5-first upper die disc, 6-first lower die disc, 21-crankshaft, 22-worm gear, 51-first transmission rod, 61-second transmission rod, 7-transmission component, 81-synchronous belt, 721-fixed block, 41-guide column guide sleeve, 52-forming die, 62-blowing die, 10-origin sensor, 63-punching knife, 53-punching die, 54-cylinder, 71-upper slide block, 72-lower slide block, 73-connecting column, 74-power source, 81-transmission belt, 82-chain wheel, 51-guide column guide sleeve, 9-screw rod, 5-die disc, 11-second guide column, 12-cover plate, 13-second upper die disc, 14-second lower die disc, 15-upper punching die, 16-punching die, 141-hopper, 17-collecting container, 18-first driving device, 19-second driving device, 151-punching pin, 111-slide, 112-guide sleeve, 161-guide channel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The plastic sheet forming machine comprises a forming device, wherein the forming device comprises a first guide pillar 4, a transmission shaft and a driving device 3 in transmission connection with the transmission shaft, a first upper die plate 5 and a first lower die plate 6 are slidably mounted on the first guide pillar 4, and the transmission shaft is in transmission connection with the first upper die plate 5 and the first lower die plate 6; the transmission shaft is a crankshaft 21, the crankshaft 21 is connected with the first upper die plate 5 and the first lower die plate 6 through a first transmission rod 51 and a second transmission rod 61 respectively, the crankshaft 21 is in shaft hub connection with the first transmission rod 51 and the second transmission rod 61, and a connecting curved surface of the crankshaft 21 and the first transmission rod 51 and a connecting curved surface of the crankshaft 21 and the second transmission rod 61 are arranged on the same crankshaft 21 in a staggered mode. A transmission rod 51 is arranged at two ends of the crankshaft 21, a second transmission rod 61 is arranged at the inner side of the first transmission rod 51, a bracket 7 is further arranged on the first guide post 4 in a sliding mode, and the upper end of the first transmission rod 51 is fixedly connected with the bracket 7. The plastic sheet forming machine is conveyed to the heating device through the transmission device, the drying ovens arranged on the upper side and the lower side of the heating device soften the sheet, then the sheet enters the forming device for forming, and then the sheet is conveyed to the blanking equipment, the blanking equipment comprises punching equipment, cutting equipment and the like, the blanking mode is selected according to specific needs, and then the finished product is rolled and taken out.

A fixed block 721 is fixed on the bracket 7, the fixed block 721 is connected with the first transmission rod 51 through a bolt, and the first upper die plate 5 is connected with the bracket 7. A guide post guide sleeve 41 is arranged on the first guide post 4, the guide post guide sleeve 41 is sleeved on the first guide post 4 and is fixedly connected with the first upper die disc 5, and the first upper die disc 5 slides on the first guide post 4 through the guide post guide sleeve 41.

The molding equipment also comprises a base 2 and a worm wheel 22 which is matched with the crankshaft 21 to be installed, and the first guide post 4 is fixedly connected with the base 2; the driving device 3 drives the worm wheel 22 to drive the crankshaft 21 to synchronously rotate, and the crankshaft 21 drives the first transmission rod 51 and the second transmission rod 61 to drive the first upper die plate 5 and the first lower die plate 6 to relatively slide on the first guide post 4.

The first upper die plate and the first lower die plate can be used for forming equipment and can also be applied to cutting equipment, if the forming equipment is adopted, a forming die 52 is fixedly arranged on the lower surface of the first upper die plate 5, an air blowing die 62 is correspondingly and fixedly arranged on the upper surface of the first lower die plate 6, and the air blowing die 62 on the first lower die plate 6 is provided with an air cylinder 54 connected with the air blowing die; or the lower surface of the first upper die plate 5 is fixedly provided with an air blowing die 62, the upper surface of the first lower die plate 6 is correspondingly and fixedly provided with a forming die 52, and the air blowing die 62 on the first upper die plate 5 is provided with an air cylinder 54 connected with the air blowing die; if the punching device is used, a punching die 53 is fixedly arranged on the lower surface of the first upper die disc 5, and a punching knife 63 is correspondingly and fixedly arranged on the upper surface of the first lower die disc 6; or the lower surface of the first upper die plate 5 is fixedly provided with a punching knife 63, and the upper surface of the first lower die plate 6 is correspondingly fixedly provided with a punching die 53.

The forming apparatus and the blanking apparatus may be provided with an origin sensor 10, and the origin sensor 10 detects a mold closing state of the upper mold platen and the lower mold platen and forms an origin signal.

The forming device further includes a mold plate position fine-tuning device, as shown in fig. 7-11, where the mold plate is used for installing a mold, and is not limited to but includes a first upper mold plate 5, the fine-tuning device may be installed on the forming device and a blanking device, taking the mold plate as the first upper mold plate 5, taking the device as the blanking device as an example, the first upper mold plate 5 may move on a support, a screw 9 is sleeved on the support, the first upper mold plate 5 is in threaded connection with the screw 9, the screw is in transmission connection with a power source 74, and the power source 74 is a motor; the first upper die plate 5 can be provided with threads to be connected with the screw 9, and can also be provided with nuts to be connected with the screw 9 in various connection modes. The carriage is constituted by upper and

lower sliders

71, 72 and is connected by a connecting column 73, and the first upper die is disposed between the upper and

lower sliders

71, 72. Of course, the bracket may also be formed integrally, and the first upper mold 5 is provided with a groove, and the connecting column 73 is disposed in the groove. The support has two sets A and B, sets up respectively in the both sides of first upper die dish, and the power supply sets up on the support, also can set up in other places, as long as set up the input shaft alright in addition on the support, and the screw rod on two sets of supports carries out the transmission by drive belt 81 through sprocket 82 and connects. The first upper die plate is arranged on the first guide pillar in a sliding mode through the guide pillar guide sleeve 51, the support is arranged on the first guide pillar, and the support is provided with a guide hole. The fine adjustment device can drive the screw rods on the brackets on the two sides to rotate through the chain wheels as long as the motor is started, and the screw rods are in threaded connection with the die disc, so that the purpose of fine adjustment can be achieved by the fact that the die disc moves up and down on threads.

Blanking equipment is including rejecting the mechanism, blanking equipment can be trimming equipment, also can be punching equipment or other equipment that need reject, take punching equipment as an example, equipment includes mount pad 1, be equipped with second guide pillar 11 on the mount pad 1 and locate second cope match-plate pattern 13 and second lower die plate 14 on second guide pillar 11 with the cunning, all be equipped with cut-out press on second cope match-plate pattern 13 and the second lower die plate 14, collection device is including setting up the hopper 141 at second lower die plate 14, the correspondence is provided with collection container 17 below hopper 141, the opening of collection container 17 is relative with the discharge gate of hopper 141.

An upper die 15 is mounted on the lower surface of the second upper die plate 13, a punching female die 16 is correspondingly arranged on the second lower die plate 14, a punching needle 151 is mounted in the upper die 15, and a guide channel 161 for the punching needle 151 to extend into is arranged in the punching female die 16 corresponding to the punching needle 151. The second guide post 11 is further provided with a sliding seat 111, and the sliding seat 111 is slidably disposed on the second guide post 11 and fixedly connected to the second lower die plate 14.

The first driving device 18 is mounted on the mounting base 1, and the first driving device 18 is connected with the sliding base 111 and drives the sliding base 111 to slide up and down along the second guide post 11. The first driving means 18 are symmetrically arranged on both sides of the collecting container 17. A guide sleeve 112 is arranged between the second upper die disc 13 and the second guide post 11, a second driving device 19 is installed on the cover plate 12, and the second driving device 19 is connected with the second upper die disc 13 and drives the second upper die disc 13 to move.

The edge of the feeding port of the hopper 141 protrudes out of the second lower die disc 14. The second lower die disc 14 is provided with a shaving waste channel, the shaving waste channel vertically penetrates through the second lower die disc 14, the upper side of the shaving waste channel is communicated with the guide channel 161, and the lower side of the shaving waste channel is communicated with the feeding port of the hopper 141. The feed opening of the hopper 141 covers the shaving waste channel of the second lower die plate 14, and the projection of the discharge opening of the hopper 141 in the horizontal direction falls into the opening of the collecting container 17. The structure for collecting the waste materials can be combined with a transmission device of the forming equipment and also can be combined with the die disc position fine adjustment device, so that the positioning blanking is better performed, and the processing precision is improved.

The transmission device is arranged in the molding equipment in the embodiment, but is not limited to be arranged on the molding equipment, and can also be applied to any equipment needing to operate the upper mold and the lower mold to clamp the molds; the fine adjustment mechanism is installed in the molding equipment in the embodiment, but is not limited to be installed on the molding equipment, and can also be applied to any equipment needing to adjust the position of the mold plate.

Claims

1. A plastic sheet forming machine comprises a forming device, wherein the forming device comprises a transmission structure, the transmission structure comprises a first guide pillar, a transmission shaft and a driving device in transmission connection with the transmission shaft, a first upper die plate and a first lower die plate are slidably mounted on the first guide pillar, and the transmission shaft is in transmission connection with the first upper die plate and the first lower die plate; the method is characterized in that: the transmission shaft is a crankshaft, the crankshaft is connected with the first upper die plate and the first lower die plate through a first transmission rod and a second transmission rod respectively, the crankshaft is connected with the first transmission rod and the second transmission rod through shaft hubs, and a connecting curved surface of the crankshaft and the first transmission rod and a connecting curved surface of the crankshaft and the second transmission rod are arranged on the same crankshaft in a staggered mode.

2. A plastic sheet molding machine as claimed in claim 1, wherein: blanking equipment is including rejecting the mechanism, and this rejecting mechanism includes the mount pad, is equipped with the second guide pillar on the mount pad and locates the second on the second guide pillar mould dish and second lower mould dish, all is equipped with cut-out press on the second on mould dish and the second lower mould dish, and collection device is including setting up the hopper at second lower mould dish, and the hopper below correspondence is provided with the collection container, and the opening of collecting the container is relative with the discharge gate of hopper.

3. A plastic sheet molding machine as claimed in claim 1, wherein: the forming equipment further comprises a die disc position fine-tuning device, the die disc position fine-tuning device comprises a support for mounting the die disc, the die disc can move on the support, a screw rod is sleeved on the support and is in threaded connection with the die disc, and the screw rod is in transmission connection with a power source.

4. A plastic sheet molding machine as claimed in claim 1, wherein: the molding equipment also comprises a base and a worm wheel which is matched with the crankshaft, and the first guide pillar is fixedly connected with the base.

5. A plastic sheet molding machine as claimed in claim 1, wherein: the first guide pillar is provided with a guide pillar guide sleeve which is sleeved on the first guide pillar and fixedly connected with the first upper die plate, and the first upper die plate slides on the first guide pillar through the guide pillar guide sleeve.