CN105351575A - Check valve for rubber injection molding - Google Patents

Abstract

The invention relates to a valve and discloses a check valve for rubber injection molding. The check valve comprises a valve body. The valve body is connected to an injection molding barrel and arranged between a threaded rod and an air cylinder. A valve seat is arranged in the valve body, and a valve element is arranged on the valve seat. A valve rod penetrating the valve body is connected to the valve element, and symmetric striker plates are hinged to the portion, below the valve element, of the valve body. Elastic parts are arranged between the two striker plates and the valve body, and the sum of the lengths of the two striker plates is larger than the caliber of the valve body. Compared with the prior art, when the air cylinder squeezes plastic, due to the check valve, part of the plastic is prevented from being squeezed on the threaded rod; and the plastic cannot apply acting force to the threaded rod, damage to the threaded rod is reduced, and the service life of the threaded rod is prolonged.

Description

Rubber injection mold one-way valve

Technical field

The present invention relates to a kind of valve, be specifically related to a kind of rubber injection mold one-way valve.

Background technique

The method that plastic cement is shaped is a lot, but it is the most general with the use of injection molding method, especially in recent years for continuous research and the improvement of forming machine, by manual, semi-automatic and arrive full-automatic, but because of the difference of formed machining character, various multi-form forming machine must be had, to adapt to different operating conditions, even if in the forming machine of same specification, also can be different because of the design of each producer, and form is different.

Generally, universal injection machine basic structure comprises three parts, i.e. ejecting device, mold closing mechanism (locked mode and knockout) and hydraulic transmission and electric control system, wherein ejecting device is the cardiac component of injection machine, its effect ensures timing, quantitatively heating material plasticizing and melting, then with certain pressure and faster speed the molten plastic being equivalent to a shot is injected in mold cavity, penetrate the complete melt that one period of dwell time also will be had to shrink because of cooling to supplement a part in die cavity, make goods closely knit and prevent material reflux in die cavity.Therefore, ejecting device must ensure that plastics are homogenous plasticized, and has enough injection pressure and dwell pressure.

These ejecting devices required can be met and mainly contain plunger type, plunger one screw type, screw type etc., wherein screw type ejecting device, comprise injection moulding cylinder, injection moulding cylinder is communicated with hopper, screw rod 12 is provided with in injection moulding cylinder, cylinder 11 is provided with in the left side injection moulding cylinder of screw rod 12, as shown in Figure 2, when cylinder 11 place transported to by plastic cement by screw rod 12, when plastic cement amount reaches a certain amount of, screw rod 12 stops operating, start cylinder 11, plastic cement is injected in mould by cylinder 11, and because screw rod 12 is adjacent with cylinder, cylinder is when extruding plastic cement, part plastic cement can be compressed on screw rod 12, and pressure is applied to screw rod 12, damage is caused to screw rod 12, reduce screw rod 12 working life.

Summary of the invention

The invention is intended to provide a kind of rubber injection mold one-way valve of increasing work efficiency.

Rubber injection mold one-way valve in this programme, comprise valve body, valve body to be connected on injection moulding cylinder and to be located between screw rod and cylinder, valve seat is provided with in valve body, valve seat is provided with spool, spool is connected with the valve rod through valve body, the valve body below spool is hinged with symmetrical material retaining board, two are equipped with elastic component between material retaining board and valve body, and the length sum of two material retaining boards is greater than the bore of valve body.

The know-why of this programme and beneficial effect are: plastic cement is transported to one-way valve place by screw rod, and enter in valve body, by controlling valve rod, spool is separated with valve seat, and is opened by the opening of valve seat, plastic cement enters in the valve body below valve seat by opening, plastic cement contacts with two material retaining boards, and pressing material retaining board to lower swing, two material retaining boards do not contact with each other, and plastic cement flows in the injection moulding cylinder of valve body outside through two material retaining boards.

Then plastic cement enters in cylinder, start cylinder, plastic cement is injected in mould by cylinder, because cylinder is communicated with valve body, so part plastic cement will have in squeezed inlet valve body, plastic cement contacts with two material retaining boards subsequently, two are equipped with elastic component between material retaining board and valve body, two material retaining boards will be kept certain height, now plastic cement will upwardly upwards swing by two material retaining boards, again because the length sum of two material retaining boards is greater than the bore of valve body, so two material retaining boards will contact with each other and offset, make to be closed below valve seat, therefore plastic cement can not contact with valve seat, more can not enter into above valve seat by the opening of valve seat, and pass through valve body, plastic cement is contacted with screw rod.

Compared with prior art, cylinder is when extruding plastic cement, and the setting of one-way valve, prevents part plastic cement to be compressed on screw rod, and makes plastic cement can not apply active force to screw rod, decreases the damage of screw rod, improves the working life of screw rod.

Further, between valve rod and valve body, be provided with sealing gasket, when valve rod makes spool be separated with valve seat, valve rod is relative to valve body or slip or rotate, gap between the two easily makes plastic cement flow out, and sealing gasket can make to form sealing between valve rod and valve body, avoids plastic cement excessive in valve body.

Further, elastic component is spring, and spring is a kind of mechanical parts utilizing elasticity to carry out work, there is deformation under external force with the part that elastic material is made, restore to the original state again after removing external force, when cylinder stops extruding plastic cement, two material retaining boards, by the elastic force of spring, are easy to restore to the original state.

Further, the position of two material retaining board symmetry axis is provided with projection, protruding between valve seat and material retaining board, when two material retaining boards upwards swing, two material retaining boards and projection contacts, protruding setting, two material retaining boards can be made easier in valve seat closed downwards, make plastic cement more be difficult to contact valve seat.

Further, material retaining board is rubber plate, and when material retaining board and projection contacts, two material retaining boards also micro-deformation can occur, and makes the more tight of two material retaining boards and projection contacts, further ensures plastic cement and can not contact valve seat.

Accompanying drawing explanation

Fig. 1 is the structural representation of rubber injection mold one-way valve embodiment of the present invention;

Fig. 2 is the schematic diagram of prior art in background technique.

Embodiment

Below by embodiment, the present invention is further detailed explanation:

Reference character in Figure of description comprises: valve body 1, valve rod 2, sealing gasket 3, valve seat 4, spool 5, protruding 6, first rubber plate 7, second rubber plate 8, first extension spring 9, second extension spring 10, cylinder 11, screw rod 12.

Shown in the basic reference drawing 1 of embodiment and Fig. 2: rubber injection mold one-way valve, comprise valve body 1, valve body 1 to be connected on injection moulding cylinder and to be located between screw rod 12 and cylinder 11, valve seat 4 is provided with in valve body 1, valve seat 4 is provided with spool 5, spool 5 is connected with the valve rod 2 through valve body 1, , sealing gasket 3 is provided with between valve rod 2 and valve body 1, valve body 1 below spool 5 is hinged with the first symmetrical rubber plate 7 and the second rubber plate 8, the position of the first rubber plate 7 and the second rubber plate 8 symmetry axis is provided with protruding 6, protruding 6 are positioned at valve seat 4 and the first rubber plate 7, between second rubber plate 8, the first extension spring 9 is equipped with between first rubber plate 7 and valve body 1, the second extension spring 10 is equipped with between second rubber plate 8 and valve body 1, the length sum of the first rubber plate 7 and the second rubber plate 8 is greater than the bore of valve body 1.

Plastic cement is transported to one-way valve place by screw rod 12, and enter in valve body 1, by controlling valve rod 2, spool 5 is separated with valve seat 4, and the opening of valve seat 4 is opened, plastic cement enters in the valve body 1 below valve seat 4 by opening, plastic cement and the first rubber plate 7, second rubber plate 8 contacts, first extension spring 9 and the second extension spring 10 can make the first rubber plate 7 and the second rubber plate 8 relatively be tilted to down, plastic cement is more easily made to press the first rubber plate 7 and the second rubber plate 8 to lower swing, first rubber plate 7 and the second rubber plate 8 do not contact with each other, also not with protruding 6 to contacting, plastic cement flows in the injection moulding cylinder of valve body 1 outside through the first rubber plate 7 and the second rubber plate 8.

Then plastic cement enters in cylinder 11, start cylinder 11, plastic cement is injected in mould by cylinder 11, because cylinder 11 is communicated with valve body 1, so part plastic cement will have in squeezed inlet valve body 1, plastic cement and the first rubber plate 7 and the second rubber plate 8 are in contact subsequently, the first extension spring 9 is equipped with between first rubber plate 7 and valve body 1, the second extension spring 10 is equipped with between second rubber plate 8 and valve body 1, first rubber plate 7 and the second rubber plate 8 will be kept certain height, now plastic cement will overcome the first extension spring 9 and the second extension spring 10 elastic force promotes the first rubber plate 7 and the second rubber plate 8 all upwards swings, again because the length sum of the first rubber plate 7 and the second rubber plate 8 is greater than the bore of valve body 1, the position of the first rubber plate 7 and the second rubber plate 8 symmetry axis is provided with protruding 6, protruding 6 are positioned at valve seat 4 and the first rubber plate 7, between second rubber plate 8, so the first rubber plate 7 will contact and offset with protruding 6 with the second rubber plate 8, make to be closed below valve seat 4 more tight, therefore plastic cement can not contact with valve seat 4, more can not enter into above valve seat 4 by the opening of valve seat 4, and by valve body 1, plastic cement is contacted with screw rod 12.

After treating that cylinder 11 presses plastic cement, cylinder 11 backhaul, the first rubber plate 7 and the second rubber plate 8 lose extruding force, and the elastic force of the first extension spring 9 and the second extension spring 10 resets making the first rubber plate 7 and the second rubber plate 8 respectively.

Above-described is only embodiments of the invention, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this.Should be understood that; for a person skilled in the art, under the prerequisite not departing from structure of the present invention, some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.The protection domain that this application claims should be as the criterion with the content of its claim, and the embodiment in specification etc. record the content that may be used for explaining claim.

Claims (5)

1. rubber injection mold one-way valve, it is characterized in that, comprise valve body, valve body to be connected on injection moulding cylinder and to be located between screw rod and cylinder, and be provided with valve seat in valve body, valve seat is provided with spool, spool is connected with the valve rod through valve body, valve body below spool is hinged with symmetrical material retaining board, two are equipped with elastic component between material retaining board and valve body, and the length sum of two material retaining boards is greater than the bore of valve body.

2. rubber injection mold one-way valve according to claim 1, is characterized in that: be provided with sealing gasket between described valve rod and valve body.

3. rubber injection mold one-way valve according to claim 2, is characterized in that: described elastic component is spring.

4. rubber injection mold one-way valve according to claim 3, is characterized in that: the position of described two material retaining board symmetry axis is provided with projection, protruding between valve seat and material retaining board.

5. rubber injection mold one-way valve according to claim 4, is characterized in that: described material retaining board is rubber plate.