CN115339041A - Suspension material sheet extruder - Google Patents

Abstract

This patent provides a suspension material sheet metal extruder, and it can extrude the sheet metal that the thickness is even, mechanical properties is good, and production efficiency is high, low in production cost. The device comprises a rack, a lower template fixed on the rack, an upper template connected with the lower template through a guide post, a sliding template arranged on the guide post in a sliding manner, a piston rod of an oil cylinder arranged on the upper template and connected with the sliding template, an outer mold fixed on the lower template, a shaping mold connected with the lower end of the outer mold, and a heating device arranged on the periphery of the lower part of the outer mold; the outer mold and the shaping mold are internally provided with a mold cavity; the lower part of the sliding template is connected with a mold core which can extend into the mold cavity; a charging tray base is fixed at the upper end of the outer die, a charging tray is arranged on the charging tray base, and charging chutes communicated with die cavity inlets at the upper ends of the die cavities are respectively arranged on the tray bottom and the charging tray base; the scraper driving device drives the scraper to move back and forth, and materials placed on the bottom of the plate are pushed into the die cavity through the charging chute.

Description

Suspension material sheet extruder

Technical Field

The patent relates to a sheet extruder, in particular to a PTFE suspension material sheet extruder.

Background

The existing extruder can only be used for extruding round pipes generally, and cannot extrude thin plates generally due to difficult feeding and large frictional resistance. Even if the extrusion can be carried out with difficulty, the defects of uneven thickness, poor mechanical properties and the like are often shown.

Disclosure of Invention

The utility model aims at providing a suspension material sheet metal extruder, it can extrude the sheet metal that thickness 5mm, width 300mm are about even, mechanical properties is good, and production efficiency is high, low in production cost.

In order to achieve the purpose, the suspended material sheet extruder comprises a rack, a lower template, an upper template, a sliding template and an oil cylinder, wherein the lower template is fixed on the rack; a cuboid-shaped die cavity which is communicated up and down is arranged in the outer die and the shaping die, and the width of the die cavity in the left-right direction is larger than the thickness of the die cavity in the front-back direction; the lower part of the sliding template is connected with a mold core which can extend into the mold cavity; a charging tray base is fixed at the upper end of the outer die, a charging tray is arranged on the charging tray base, the charging tray comprises a tray bottom and a tray edge extending upwards at the periphery of the tray bottom, and a charging chute communicated with a die cavity inlet at the upper end of the die cavity is formed in the tray bottom and the charging tray base; the material scraping device mainly comprises a scraping plate and a scraping plate driving device for driving the scraping plate to move back and forth, wherein the scraping plate driving device drives the scraping plate to move back and forth, and materials placed on the bottom of the plate are pushed into the die cavity through the blanking groove.

In the suspension material sheet extruder, the material tray rotating relative to the material tray base is arranged on the material tray base, and the material tray is connected with the material tray driving mechanism which drives the material tray driving mechanism to rotate relative to the material tray base; the material tray driving mechanism comprises a motor fixed on the upper template or the lower template, a driving gear connected with an output shaft of the motor, and meshing teeth which are meshed with the driving gear and arranged on the periphery of the material tray. Preferably, the motor is fixed on the upper template, the output shaft is connected with a driving gear shaft which penetrates through the sliding template and is rotatably supported on the lower template at the lower end, and the driving gear is fixed on the driving gear shaft.

In the suspended material sheet extruder, the scraper is arc-shaped, and the middle shaft of the arc-shaped scraper is connected with the scraper driving device.

In the suspended material sheet extruder, the outer mold fixing seat is internally provided with a cooling water channel for introducing cooling water.

In the suspended material sheet extruder, the lower end of the shaping die is provided with the heat-insulating sleeve extending in the vertical direction of the die cavity.

The suspension material sheet extruder adopts PTFE powder as the material, the thickness of the extruded PTFE sheet is 4.5mm-5.5mm, the width of the extruded PTFE sheet is 300mm-320mm, the sample tensile strength is not lower than 22MPa, and the elongation at break is 280-300%.

The suspension material sheet extruder also comprises an automatic feeding device, and a blanking port of the automatic feeding device is arranged above the bottom of the plate.

When the material tray of the suspension material sheet extruder rotates, the following actions are repeated: the rotation is performed first for 3 cycles and then for 1 cycle.

The beneficial effect of this patent:

the method adopts vertical extrusion molding continuous forming, and after a suspension material (such as PTFE powder) is compressed into a pre-formed product, the suspension material is heated and melted through a mold cavity, and then is cooled and formed, and a thin plate with uniform thickness and meeting the mechanical property is obtained through heat preservation. The specific process is as follows:

filling: the material is placed on the tray bottom, or the material falls on the tray bottom through the automatic feeding device, and the material falls into the die cavity through the back-and-forth movement of the scraper plate in the scraping device.

The scraper driving device driving the scraper to move back and forth can be a driving device such as an air cylinder.

In order to make the material fall into the die cavity more uniformly, the material tray preferably rotates relative to the material tray base under the drive of the material tray driving mechanism. For example, the material tray rotates reversely for 1 week after rotating positively for 3 weeks, so that the material in the die cavity is more uniform.

When the device is used for the first time, in order to prevent the materials in the die cavity from directly leaking out of the lower end of the die cavity through the die cavity, a plug (such as a multilayer braided belt) with certain friction resistance with the inner wall of the die cavity is filled in advance at the lower part close to the inlet of the die cavity.

Pressing: after the die cavity above the plug is filled with the materials, the material tray and the cylinder stop moving, the scraper cylinder returns to the initial position, the oil cylinder moves to drive the sliding template to move downwards along the guide pillar, the die core moves downwards to stretch into the die cavity to extrude the materials in the die cavity, the materials are pre-pressed, and meanwhile, the plug can move downwards for a distance in the die cavity.

Then the oil cylinder drives the mold core to move upwards. And then repeating the processes of filling and pressing, wherein the compacted material in the die cavity gradually reaches the lower part of an outer die with a heating device, the heating device heats the material compressed in the die cavity, and the material is gradually melted due to the friction force between the material and the die cavity.

And (3) pressing the material under a mold core driven by the oil cylinder, gradually cooling and molding the molten material in the shaping mold, enabling the plate to enter the heat-insulating sleeve from the lower end of the shaping mold, gradually reducing the temperature along with the downward movement of the plate in the heat-insulating sleeve, further releasing the internal stress, and finally obtaining the continuously extruded sheet.

When the scraper blade is the arc, be more applicable to the situation of only a die cavity, it can be fast in the material pushes the die cavity into.

Reciprocating type scraping of scraper, in addition the rotation of charging tray, the material can evenly get into the die cavity, and the sheet texture that obtains is more even.

The PTFE sheet extruded by the extruder has the thickness of 4.5mm-5.5mm, the width of 300mm-320mm, the tensile strength of not less than 22MPa, the elongation at break of 280-300 percent and better quality.

Drawings

FIG. 1 is a perspective view of a suspended material sheet extruder;

FIG. 2 is a perspective view of the upper die plate, the lower die plate, the material tray driving mechanism, etc.;

FIG. 3 is a schematic view of the packing state (cylinder rod extended);

FIG. 4 is a schematic view of the depressed state (cylinder rod retracted);

FIG. 5 is a schematic view of an outer mold, heating device, etc.;

fig. 6 is a schematic view of a sizing die, a thermal insulating sleeve and the like.

In the figure, the position of the first and second end faces, the device comprises a frame 1, a lower template 2, a guide post 3, an upper template 4, a sliding template 5, an oil cylinder 6, an outer mold 7, a mold cavity 71, a mold cavity inlet 711, an outer mold fixing seat 8 a cooling water channel 81, a shaping mould 9, a heating device 10, a heating ring 101, a thermocouple 102, a mold core 11, a tray base 12,

Tray 13, tray bottom 131, tray edge 132,

The tray driving mechanism 14, the motor 141, the driving gear shaft 142, the driving gear 143, the engaging teeth 144, the engaging teeth,

A charging chute 15,

A scraper 16, a scraper 161, a rubber substrate 162, a cylinder 163,

The heat preservation sleeve 20, the automatic feeding device 21, the blanking port 211, the plug 22, the material 23 and the solid plug 231.

Detailed Description

Referring to fig. 1 and 2, the suspension material sheet extruder includes a frame 1, a lower template 2 fixed on the frame, an upper template 4 connected to the lower template through a guide pillar 3, a sliding template 5 slidably disposed on the guide pillar 3, and an oil cylinder 6 disposed on the upper template, wherein a piston rod of the oil cylinder is connected to the sliding template 5.

The outer die 7 is fixed on the lower die plate 2 through an outer die fixing seat 8, the lower end of the outer die is connected with a shaping die 9, the lower end of the shaping die is provided with a heat insulation sleeve 20 which is connected with the rack and extends in the vertical direction of the die cavity, and heat insulation cotton is filled in the heat insulation sleeve. The periphery of the lower part of the outer mold 7 is provided with a heating device 10; a cuboid-shaped cavity 71 which penetrates up and down is formed in the outer die and the shaping die, the width of the cavity in the left-right direction is 310mm, and the thickness in the front-back direction is about 5mm. And a cooling water channel 81 for introducing cooling water is formed in the outer mold fixing seat 8, so that the upper part of the outer mold is lower than 25 ℃, and the material flow is not blocked.

The lower part of the sliding template is connected with 1 mold core 11 which can extend into the mold cavity.

A material tray base 12 is fixed at the upper end of the outer die fixing seat 8, a material tray 13 which rotates relative to the material tray base is arranged on the material tray base 12, the material tray comprises a tray bottom 131 and a tray edge 132 which extends upwards at the periphery of the tray bottom, and the material tray is connected with a material tray driving mechanism 14 which drives the material tray driving mechanism to rotate relative to the material tray base; the tray driving mechanism 14 includes a motor 141 fixed to the upper mold plate, an output shaft of the motor is connected to a driving gear shaft 142 passing through the slide mold plate and having a lower end rotatably supported to the lower mold plate, a driving gear 143 is fixed to the driving gear shaft, and engaging teeth 144 engaged with the driving gear are provided on an outer periphery of the tray bottom.

And the central parts of the tray bottom, the tray base and the outer mold fixing seat are all provided with a charging chute 15 communicated with a mold cavity inlet 711 at the upper end of the mold cavity 71.

The scraper 16 mainly includes an arc-shaped scraper 161, a rubber substrate 162, and a cylinder 163. The bottom edge of the squeegee 161 is connected to the rubber substrate 162, and the rubber substrate 162 is in contact with the upper surface of the tray bottom. The middle of the scraper 161 is connected with a piston rod of a cylinder 163 which crosses the disc edge at the upper part of the disc edge, and the cylinder 163 is fixed on the lower template.

The automatic feeding device 21 belonging to the prior art is fixed on one side of the upper die plate, and the blanking port 211 of the automatic feeding device is arranged above the bottom of the plate. The automatic feeding device 21 is filled with a material 23, namely PTFE powder. The automatic feeder 21 is operated, and the PTFE powder falls on the tray bottom 131 of the tray 13 through the blanking port 211.

Then, filling: the cylinder acts, the piston rod extends out, see fig. 3), and the scraper and the rubber substrate are driven to move forwards. While the cylinder moves, the material tray repeats the following actions: the rotation is performed for 3 weeks and then for 1 week.

When the scraper and the rubber substrate are moved forward toward the cavity, the PTFE powder falling on the bottom plate is pushed into the cavity through the chute and the cavity entrance.

In order to prevent the material in the cavity from directly leaking out of the lower end of the cavity through the cavity, a plurality of layers of woven tapes which have certain friction resistance with the inner wall of the cavity are pre-filled at the lower part close to the inlet of the cavity to be used as a plug 22.

Pressing: after the die cavity and the charging chute above the plug are filled with materials, the charging tray and the air cylinder stop moving (see fig. 4), the oil cylinder moves to drive the sliding die plate to move downwards along the guide pillar, the die core moves downwards to stretch into the die cavity to extrude the materials in the die cavity to pre-press the materials, and meanwhile, the plug can move downwards for a certain distance in the die cavity.

Then the oil cylinder drives the mold core to move upwards through the sliding mold plate. And then repeating the processes of filling and pressing, wherein the compacted material in the die cavity gradually reaches the lower part of an outer die with a heating device, the heating device heats the material compressed in the die cavity, and the material is gradually melted due to the friction force between the material and the die cavity.

The materials are pressed down under a mold core driven by an oil cylinder, the molten materials are gradually cooled and formed in the shaping mold when reaching the lower end of the shaping mold, the plates enter the heat insulation sleeve from the lower end of the shaping mold, the temperature is gradually reduced along with the downward movement of the plates in the heat insulation sleeve, the internal stress is further released, and finally a continuously extruded sheet is obtained.

The arc-shaped scraper is more suitable for the situation that only one die cavity is provided, and can quickly push materials into the die cavity.

The outer die is fixed with the lower die plate and the rack through the outer die fixing seat, the die core is connected with the oil cylinder piston rod through the sliding die plate, and therefore the die core is accurate in positioning, stable and reliable in movement, uniform in die cavity clearance with the outer die, free of clamping stagnation and free of mutual movement. The heating device 10 adopts a far infrared chain type ceramic heating ring 101, a heat preservation device is added on the outer heat dissipation surface of the heating ring, and a ceramic far infrared heating element is arranged inside the heating ring, so that the outer die can be effectively heated quickly and uniformly, and the work is stable.

The feeding adopts an automatic feeding device. The charging tray rotates anticlockwise through a driving gear driven by the servo motor 141 to continuously receive materials, and after the charging tray rotates anticlockwise for 3 circles, the charging tray rotates clockwise for 1 circle (seen from top to bottom). The cylinder drives the scraper to scrape materials in a reciprocating mode (see figure 3), the materials fall under the pushing force and the self weight, and after the die cavity and the blanking groove are filled, the cylinder returns to the stop position (see figure 4). The mould core is gradually pushed and pressed downwards under the driving of the oil cylinder, the dispersed materials 23 are gradually compacted into the solid plugs 231 under the stress of the materials and the extrusion of the four walls. The bottom of the outer die is clamped in a die cavity of the outer die by a plurality of layers of 5mm wide woven belts to provide certain support for materials. The repeated movement of the mold core presses new material at the inlet of the chute and mold cavity into the top of the last section of solid plug 231, causing the material to compact.

The solid plug 231 is pushed to a sintering area with a heating device at the periphery of the outer die, and is subjected to frictional heat with the four walls of the outer die and heat of a heating ring outside the outer die to start melting, and the part which is firstly contacted with the outer wall of the outer die is gradually melted from outside to inside, so that the solid plug is in a full-melting state. At this time, the mold core needs to apply proper pressure holding of the top solid plug to ensure that the clearance in the molten body is eliminated and higher melting strength is obtained. Referring to fig. 6, a heating device, i.e., 5 heating rings 101, are installed in the sintering zone of the mold, and the heating temperatures of the 5 heating rings are 315 ℃, 375 ℃, 378 ℃ and 310 ℃, respectively. Each section is monitored by an independent thermocouple 102 to ensure accurate temperature and thorough material burning.

The thin plate passing through the sintering area reaches the shaping die and starts to enter a cooling stage, the shaping die is additionally arranged at the lowest end of the outer die, the time of the thin plate in the shaping die can be prolonged, the thin plate is prevented from being exposed in the air too early, the thin plate is well supported when releasing internal stress during cooling, and the product is prevented from deforming. And the thin plate continuously stays in the heat-insulating sleeve after coming out of the shaping die, and the internal stress is continuously released.

The thickness of the suspension extrusion PTFE sheet is 5.0mm, the width is 310mm, the sampling tensile strength can reach 23.5MPa, and the elongation at break is stabilized at about 290%.

Claims (8)

1. A suspended material sheet extruder comprises a rack, a lower template fixed on the rack, an upper template connected with the lower template through a guide pillar, a sliding template arranged on the guide pillar in a sliding manner, an oil cylinder arranged on the upper template, a piston rod of the oil cylinder connected with the sliding template, an outer mold fixed on the lower template, a shaping mold connected with the lower end of the outer mold, and a heating device arranged on the periphery of the lower part of the outer mold; the method is characterized in that: a cuboid die cavity which is communicated up and down is arranged in the outer die and the shaping die, and the width of the die cavity in the left-right direction is larger than the thickness of the die cavity in the front-back direction; the lower part of the sliding template is connected with a mold core which can extend into the mold cavity; a charging tray base is fixed at the upper end of the outer die, a charging tray is arranged on the charging tray base, the charging tray comprises a tray bottom and a tray edge extending upwards at the periphery of the tray bottom, and a charging chute communicated with a die cavity inlet at the upper end of the die cavity is formed in the tray bottom and the charging tray base; the material scraping device mainly comprises a scraping plate and a scraping plate driving device for driving the scraping plate to move back and forth, wherein the scraping plate driving device drives the scraping plate to move back and forth, and materials placed on the bottom of the plate are pushed into the die cavity through the blanking groove.

2. The suspended material sheet extruder of claim 1, wherein: a material tray which rotates relative to the material tray base is arranged on the material tray base, and the material tray is connected with a material tray driving mechanism which drives the material tray to rotate relative to the material tray base; the material tray driving mechanism comprises a motor fixed on the upper template or the lower template, a driving gear connected with an output shaft of the motor, and meshing teeth which are meshed with the driving gear and arranged on the periphery of the material tray.

3. The suspended material sheet extruder as set forth in claim 2, wherein: the motor is fixed on the cope match-plate pattern, and the output shaft links to each other with passing sliding template and lower extreme rotation support drive gear shaft on the lower bolster, and drive gear fixes on drive gear shaft.

4. The suspended material sheet extruder of claim 1, wherein: the scraper blade is arc, and the axis of arc scraper blade links to each other with scraper blade drive arrangement.

5. The suspended material sheet extruder of claim 1, wherein: and a cooling water channel for introducing cooling water is formed in the outer die fixing seat.

6. The suspended material sheet extruder of claim 1, wherein: the lower end of the shaping mold is provided with a heat insulation sleeve extending in the vertical direction of the mold cavity.

7. The suspended material sheet extruder of claim 1, wherein: the material is PTFE powder; the thickness of the extruded PTFE sheet is 4.5mm-5.5mm, the width is 300mm-320mm, the tensile strength is not lower than 22MPa, and the elongation at break is 280-300%.

8. The suspended material sheet extruder as set forth in claim 1, wherein: it still includes automatic material conveying device, and automatic material conveying device's blanking mouth is in the bottom of a plate top.

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