CN108544702A - Ptfe ring automatic mould press - Google Patents

Abstract

The invention discloses polytetrafluoroethylsealed sealed ring automatic mould press, including the mould bases being fixed on column, and the molding cylinder set on the vertical center of mould bases, wherein：It is molded cylinder, top is flexible up and down by the upper mold that upper cylinder drives bottom to have molding bulge loop, and internal bottom position has the lower die of crossette flexible up and down by lower hydraulic oil cylinder driving；The crossette setting of the molding bulge loop face lower die of upper mold, and the top of the crossette of lower die is encircled into sealing ring cavity with molding cylinder inside, molding bulge loop bottom；Sealing ring intracavitary obtains polytetrafluoroethylene (PTFE) feed ethylene by connecting the feed pipe of injection molding machine metering device；The vertical direction of the crossette of lower die runs through an at least discharging mandril, and discharging mandril passes through its up and down motion of discharging power source drive；Upper cylinder, lower oil cylinder and discharging power source are all connected with PLC control devices.The slave feeding of polytetrafluoroethylsealed sealed ring is completed to die forming, the full-automatic processing of product discharging, has high in machining efficiency, formed product is high-quality, and operating cost is low.

Description

PTFE ring automatic molding machine

technical field

The invention relates to the technical field, in particular to an automatic molding machine for tetrafluoro sealing rings.

Background technique

High-molecular polymers, especially polytetrafluoroethylene (PTFE) and ultra-high molecular weight polyethylene (UHMWPE), due to their high melt viscosity, small friction coefficient, and low critical shear rate, bring great challenges to mixing and injection molding. It is very difficult to use existing injection molding machines for injection molding, and it is even more difficult to form oversized workpieces.

Chinese patent, application (patent) number: CN03230670.9, has announced a kind of compound material, high molecular polymer special-purpose molding equipment, comprises the kneader (twin-screw or single-screw extruder) with batching hopper, with Injection barrels and molding machines for pistons. The outlet of the mixer is connected with the front outlet of the injection barrel through a check valve, and the material to be molded can be injected into the injection barrel to ensure that the material of each product is brand new; the injection barrel passes through the check valve It is connected with the mold of the molding machine, and the material in the injection cylinder is injected into the mold through the piston.

The equipment integrates plastic alloy mixing, injection molding, and molding into one body, overcoming the difficulty of injection molding of polymer materials and composite materials, especially polytetrafluoroethylene (PTFE) and ultra-high molecular weight polyethylene (UHMWPE); at the same time By only changing the volume of the injection molding cylinder, it is possible to form large-scale workpieces, which overcomes the problem of high equipment cost for forming large-scale workpieces with general injection molding machines, and through low-pressure injection molding after molding, the clamping force is reduced, which not only reduces equipment costs, but also The quality of the product is guaranteed, because compared with other injection molding machines, the cost of the machine is relatively low, only about one-fifth, and the direct molding is used to maximize the use of the energy of the molding pressure, reduce energy consumption, and it is easier to shape. Large parts and multi-cavity parts. The orientation of the molding material is small, no cracking, no deformation, easy to ensure the quality, especially easy to form high molecular polymer materials and various plastic alloys and other composite materials.

However, this molding equipment can only be used to form sheet-shaped polytetrafluoroethylene products, and cannot make ring-shaped products.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an automatic molding machine that can automatically realize material feeding, molding and automatic unloading of the PTFE sealing ring under the control of a PLC control device.

The technical solution adopted in the present invention is: an automatic molding machine for PTFE sealing rings, including a mold base fixed on the column, and a molding cylinder arranged at the vertical center of the mold base, wherein:

Molding cylinder, the upper part drives the upper die with the molded convex ring at the bottom to expand and contract up and down through the upper oil cylinder, and the inner bottom position drives the lower die with the protruding shoulder to expand and contract up and down through the lower oil cylinder;

The molding convex ring of the upper mold is set facing the shoulder of the lower mold, and the top of the shoulder of the lower mold is surrounded by the inner side of the molding cylinder and the bottom of the molding convex ring to form a sealing ring cavity;

The PTFE material is obtained in the sealing ring cavity through the feeding pipe connected to the metering device of the injection molding machine;

The vertical direction of the protruding shoulder of the lower mold runs through at least one unloading ejector rod, and the unloading ejector rod is driven to move up and down by the unloading power source;

The upper oil cylinder, the lower oil cylinder and the unloading power source are all connected to the PLC control device.

Further, the side of the molded convex ring is also provided with a connection through hole for connecting a molded collar with a diameter larger than the molded convex ring, and a plug-in device passes through the connection hole between the molded convex ring and the molded collar.

Further, the molded convex ring is provided with at least three connection through holes, and each connection through hole is connected to a plug-in device.

Further, a groove is provided near the center of the shoulder of the lower mold, and a lower mold bushing for adjusting the size of the molded sealing ring is provided in the corresponding groove on the outside of the lower mold.

Further, the feed pipe passes through the molding cylinder or the molding convex ring of the upper mold or the shoulder of the lower mold to deliver the polytetrafluoroethylene material to the sealing ring cavity.

Compared with the prior art, the beneficial effect of the present invention is: the PTFE sealing ring automatic molding machine of the present invention sets a shoulder on the top of the lower mold, so that the top of the shoulder of the lower mold is in contact with the inner side of the molding cylinder and the bottom of the molding convex ring. Enclosed to form a sealing ring cavity, before or during the forming of the sealing ring, it is only necessary to pour polytetrafluoroethylene into the sealing ring cavity, and the upper mold and the lower mold act at the same time to mold the sealing ring. The overall structure is simple, and the upper mold The size of the molded convex ring and the shoulder of the lower die can be designed to be smaller, which can meet the manufacture of the sealing ring. Compared with the prior art, the overall molding machine is light in weight and easy to realize.

In addition, after the sealing ring is molded, the vertical direction of the shoulder on the lower mold runs through at least one discharge ejector rod, and the automatic discharge is realized under the drive of the discharge power source, and the secondary loading of the PTFE sealing ring is completed. Fully automatic processing from compression molding to product unloading has the characteristics of high processing efficiency, good quality of formed products, and low operating costs.

In general, the PTFE sealing ring automatic molding machine of the present invention has a simple overall structure, and is light in weight compared to the prior art integral molding machine, and the structure is easy to realize; The fully automatic processing of unloading has the advantages of high processing efficiency, good quality of formed products and low operating cost.

Description of drawings

Fig. 1 is the structural diagram of an embodiment of tetrafluoro sealing ring automatic molding machine;

Fig. 2 is the structural diagram of an embodiment of patrix;

Fig. 3 is the structural diagram of an embodiment of lower die;

Among them: 1-column, 2-mould base, 3-molding cylinder, 4-upper oil cylinder, 5-upper mold, 51-molding convex ring, 511-connecting through hole, 52-plugging device, 53-molding collar; 6-lower oil cylinder, 7-lower mold, 71-shoulder, 711-groove, 72-lower mold bushing; 8-seal ring cavity, 9-feeding pipe, 10-discharging ejector pin, 11-discharging power source, 12-PLC control device.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments, which are only used to explain the present invention and do not limit the protection scope of the present invention.

As shown in Figure 1, the PTFE sealing ring automatic molding machine includes a mold base 2 fixed on the column 1, and a molding cylinder 3 located at the vertical center of the mold base 2, wherein: the molding cylinder 3, the top of which passes through the upper oil cylinder 4 Drive the upper mold 5 with the molded convex ring 51 at the bottom to expand and contract up and down, and the inner bottom position drives the lower mold 7 with the shoulder 71 to expand and contract up and down through the lower oil cylinder 6; the molded convex ring 51 of the upper mold 5 is facing the protrusion of the lower mold 7 Shoulder 71 is set, and the top of the shoulder 71 of the lower mold 7 is surrounded by the inner side of the molding cylinder 3 and the bottom of the molding convex ring 51 to form a sealing ring cavity 8; Fluoroethylene vinyl material can realize the precise control of the polytetrafluoroethylene material entering the sealing ring cavity 8; the vertical direction of the shoulder 71 of the lower die 7 runs through at least one discharge ejector pin 10, and the discharge ejector pin 10 Drive the up and down movement of the unloading power source 11 to automatically push the formed PTFE sealing ring out of the sealing ring cavity for unloading; to realize these controls, it is necessary to unload the upper oil cylinder 4, the lower oil cylinder 6 and the unloading power source 11. Connect the PLC control device 12.

Specifically, the working process of the PTFE sealing ring automatic molding press of the present invention is:

A shoulder is set on the top of the lower mold, so that the top of the shoulder of the lower mold, the inner side of the molding cylinder, and the bottom of the molded convex ring form a sealing ring cavity. Before the sealing ring is formed or when it is formed, it is only necessary to pour PTFE into the sealing ring cavity. Ethylene material, the upper mold and the lower mold act at the same time, and the sealing ring can be molded. After the sealing ring is molded, the vertical direction of the shoulder of the lower mold runs through at least one discharge ejector rod, and the automatic discharge is realized under the drive of the discharge power source, and the PTFE sealing ring is completed from loading to molding. Fully automatic processing for forming and product discharge.

In the above-mentioned embodiment, as shown in FIG. 2, the side of the molded convex ring 51 is also provided with a connection through hole 511 for connecting the molded collar 53 whose diameter is larger than the molded convex ring 51, and the molded convex ring 51 and the molded collar Through the plug-in device 52 in the connection through hole 511, the molded collar is pluggably connected to the outside of the molded convex ring 51, which can realize the processing of sealing rings of different shapes, and can also realize the processing of sealing rings of different sizes. Setting, the same set of upper and lower molds can be used to process sealing rings of different sizes and different cross-sections.

In order to achieve the same purpose, at least three connection through holes 511 may be provided on the molded convex ring 51 of the upper mold 5 , and each connection through hole 511 is connected to a plug-in device 52 . The plug-in device 51 described here can use standard plug-in pins, or a self-designed device with a plug-in function can be used instead. Since this structure is relatively common, it will not be described in detail here.

As shown in Figure 3, a groove 711 can also be provided near the center of the shoulder 71 of the lower mold 7, and a lower mold bushing for adjusting the size of the molded sealing ring is provided in the corresponding groove 711 outside the lower mold 7 72, also in order to realize the processing of sealing rings of different sizes and specifications, the same set of upper and lower molds can be used to process sealing rings of different sizes and different cross-sections.

A more preferred embodiment is that the feeding pipe 9 passes through the molding cylinder 3 or the molding convex ring 51 of the upper mold or the shoulder 71 of the lower mold 7 to convey the polytetrafluoroethylene material to the sealing ring cavity, and specifically seals the sealing ring first through that device. Ring feeding is determined according to usage habits.

The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. Those skilled in the art can easily comprehend the spirit of the present invention based on the above-mentioned embodiments, and make different extensions and changes. But as long as it does not deviate from the spirit of the present invention, it is within the protection scope of the present invention.

Claims (5)

1. polytetrafluoroethylsealed sealed ring automatic mould press, it is characterised in that：Including being fixed on column（1）On mould bases（2）, and it is set to mould Frame（2）The molding cylinder of vertical center（3）, wherein：

It is molded cylinder（3）, top passes through upper cylinder（4）Drive bottom that there is molding bulge loop（51）Upper mold（5）It is flexible up and down, it is internal Bottom position pass through lower oil cylinder（6）Driving has crossette（71）Lower die（7）It is flexible up and down；

Upper mold（5）Molding bulge loop（51）Face lower die（7）Crossette（71）Setting, and lower die（7）Crossette（71）Top Portion and molding cylinder（3）Inside, molding bulge loop（51）Bottom is encircled into sealing ring cavity（8）；

Seal ring cavity（8）The interior feed pipe by connecting injection molding machine metering device（9）Obtain polytetrafluoroethylene (PTFE) feed ethylene；

Lower die（7）Crossette（71）Vertical direction run through an at least discharging mandril（10）, discharging mandril（10）Pass through discharging Power source（11）Drive its up and down motion；

Upper cylinder（4）, lower oil cylinder（6）With discharging power source（11）It is all connected with PLC control devices（12）.

2. polytetrafluoroethylsealed sealed ring automatic mould press according to claim 1, it is characterised in that：It is molded bulge loop（51）Side also Equipped with for connection diameter be more than the molding bulge loop（51）Molding collar（53）Connection through-hole（511）, it is molded bulge loop（51） With molding collar（53）Connection through-hole（511）Inside pass through plug-in and pull-off device（52）.

3. polytetrafluoroethylsealed sealed ring automatic mould press according to claim 2, it is characterised in that：It is molded bulge loop（51）At least provided with Three connection through-holes（511）, each connection through-hole（511）Connect a plug-in and pull-off device（52）.

4. the polytetrafluoroethylsealed sealed ring automatic mould press according to claim 1-3 any one, it is characterised in that：Lower die（7）'s Crossette（71）It is equipped with groove close to center position（711）, lower die（7）Outer respective slot（711）It is interior to be equipped with for adjusting molding The lower die bushing of sealing ring size obtained（72）.

5. polytetrafluoroethylsealed sealed ring automatic mould press according to claim 4, it is characterised in that：Feed pipe（9）Across molding cylinder （3）Or the molding bulge loop of upper mold（51）Or lower die（7）Crossette（71）Polytetrafluoroethylene (PTFE) feed ethylene is conveyed to sealing ring cavity.