Method and Device for Batched Compression Molding of Rubber and Plastic Products by Means of Multiple Mold Cavities

Abstract

Provided is a method and device for batched compression molding of rubber and plastic products by means of multiple mold cavities, including alternate operation of a blank shuttle and a male mold that is in a bottle cap mold, being controlled by means of engagement of two incomplete gear sets. Mold opening motion, isostatic pressing energy storage, and spring energy storage are implemented by means of the engagement characteristic of the incomplete gear sets, and mold closing and compression molding are implemented by means of the non-engagement characteristic, isostatic pressing energy storage, and pressurization of the incomplete gear sets. The method and device effectively resolve the general problem of low production efficiency and poor precision and stability of existing compression molding cap manufacturing equipment.

Claims

1. A method for batched compression molding of rubber and plastic products by means of multiple mold cavities, comprising: controlling alternate operation of a blank shuttle and a male mold that is in a bottle cap mold by engaging two incomplete gear sets; wherein, in an engagement process of the two incomplete gear sets, mold opening motion, isostatic pressing energy storage, and spring energy storage are implemented by an engagement characteristic of the two incomplete gear sets, and fast mold closing and compression molding are implemented by a non-engagement characteristic, isostatic pressing energy storage, and pressurization of the two incomplete gear sets.

2. The method according to claim 1, wherein a three-bar linkage mechanism is disposed between the two incomplete gear sets and the blank shuttle, and the two incomplete gear sets use the three-bar linkage mechanism to control the blank shuttle to quickly and synchronously convey a blank to a master mold in the bottle cap mold.

3. The method according to claim 1, wherein the blank shuttle and the male mold have a same motion period.

4. The method according to claim 1, wherein the two incomplete gear sets are externally connected to a same power source.

5. A device for batched compression molding of rubber and plastic products by means of multiple mold cavities, comprising: a cable transmission mechanism comprising two incomplete gear sets, a mold-moving rotary winding wheel, a mold-moving cable, a blank-conveying rotary winding wheel, and a blank-conveying cable, wherein the two incomplete gear sets comprise a mold-moving incomplete gear set and a blank-conveying incomplete gear set; a three-bar linkage mechanism; a bottle cap mold comprising a male mold and a female mold; a blank shuttle; and a male mold supporting plate; wherein a plurality of male molds are evenly distributed on a periphery of the male mold supporting plate, one female mold being arranged under each of the plurality of male molds, with one blank shuttle arranged between the male mold and the female mold of each pair, the mold-moving incomplete gear set and the mold-moving rotary winding wheel are connected, the blank-conveying incomplete gear set and the blank-conveying rotary winding wheel are connected, one end of the mold-moving cable is wound on the mold-moving rotary winding wheel, and another end of the mold-moving cable is connected with the male mold supporting plate, one end of the blank-conveying cable is wound on the blank-conveying rotary winding wheel, and another end of the blank-conveying cable is fixedly connected to a blank-conveying cable holder, and a plurality of three-bar linkage mechanisms are distributed on the blank-conveying cable holder, wherein one end of each of the plurality of three-bar linkage mechanisms is connected with the blank-conveying cable holder, and another end of each of the plurality of three-bar linkage mechanisms is correspondingly connected with one blank shuttle.

6. The device according to claim 5, wherein a blank-conveying cable-holder supporting column is arranged in a middle of the blank-conveying cable holder and is provided with a blank shuttle supporting frame on a lower periphery, with each blank shuttle distributed on a blank shuttle supporting frame; and wherein the blank-conveying cable holder, the blank-conveying cable-holder supporting column, and the blank shuttle supporting frame form a blank-conveying cable mechanism.

7. The device according to claim 6, wherein a linkage bar supporting holder, provided inside with a return spring, is further arranged in a middle of the blank-conveying cable-holder supporting column and is respectively connected with each of the plurality of three-bar linkage mechanisms.

8. The device according to claim 5, wherein an ejection plate is arranged in parallel above the male mold supporting plate, and a first mold moving mold-moving spring is disposed between the ejection plate and the male mold supporting plate; and wherein the ejection plate is provided on an outer circumference with a plurality of ejection rods, each of the plurality of ejection rods being correspondingly located on one side of one male mold.

9. The device according to claim 8, wherein a mold-moving supporting plate is arranged in parallel above the ejection plate, and a second mold-moving spring is arranged between the mold-moving supporting plate and the ejection plate; wherein the male mold supporting plate is provided with a compression molding oil cylinder whose piston passes through the ejection plate to be located in the second mold-moving spring; and wherein the compression molding oil cylinder is provided at a bottom with a compression molding oil guiding plate and a compression molding switch valve, and a pressure relief oil guiding plate is arranged at a bottom of the compression molding oil guiding plate.

10. The device according to claim 9, wherein the mold-moving supporting plate is provided with an oil tank, and the male mold supporting plate is provided with an energy storage oil cylinder, with a front drive piston of the energy storage oil cylinder passing through the ejection plate to be connected with the oil tank; and wherein a pressure relief valve is provided on one side of the energy storage oil cylinder.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a schematic diagram showing the principle of the device for batched compression molding of rubber and plastic products by means of multiple mold cavities.

[0027] FIG. 2 is a schematic diagram showing the principle of connecting two incomplete gear sets in the cable transmission mechanism with the mold moving rotary winding wheel and the blank conveying rotary winding wheel.

[0028] In the above figures, the components indicated by the reference numerals are as follows: 1. A power source; 2. a cable transmission mechanism; 3. an oil tank; 4. a mold moving supporting plate; 5. a front drive piston; 6. an ejection plate; 7. an energy storage oil cylinder; 8. a male mold supporting plate; 9. a male mold; 10. a blank shuttle; 11. a feeding device; 12. a female mold; 13. a blank shuttle supporting frame; 14. a compression molding switch valve; 15. a pressure relief oil guiding plate; 16. a compression molding oil guiding plate; 17. a linkage bar supporting holder; 18. a return spring; 19. a three-bar linkage mechanism; 20. a second mold moving spring; 21. a pressure relief valve; 22. a linkage bar supporting holder; 23. a blank conveying cable holder; 24. a blank conveying cable; 25. a mold moving cable; 26. a compression molding oil cylinder; 27. an ejection rod; 28. a first mold moving spring; 29. a mold moving incomplete gear set; 30. a mold moving rotary winding wheel; 31. a blank conveying incomplete gear set; 32. a blank conveying rotary winding wheel; 33. a spur gear set; 34. a bottle cap product; and 35. a bevel gear set.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

Example

[0030] A device for batched compression molding of rubber and plastic products by means of multiple mold cavities of this example, as shown in FIG. 1, comprises a cable transmission mechanism, a three-bar linkage mechanism, a bottle cap mold, a blank shuttle and a male mold supporting plate.

[0031] As shown in FIG. 2, the cable transmission mechanism comprises two incomplete gear sets, a mold moving rotary winding wheel, a mold moving cable, a blank conveying rotary winding wheel and a blank conveying cable, and the two incomplete gear sets comprise a mold moving incomplete gear set and a blank conveying incomplete gear set. The bottle cap mold comprises a male mold and a female mold, a plurality of male molds being evenly distributed on the periphery of the male mold supporting plate, one female mold being arranged under each of the male molds, with one blank shuttle arranged between the male mold and the female mold of each pair.

[0032] The mold moving incomplete gear set and the mold moving rotary winding wheel are connected; the blank conveying incomplete gear set and the blank conveying rotary winding wheel are connected; one end of the mold moving cable is wound on the mold moving rotary winding wheel, and the other end of the mold moving cable is connected with the male mold supporting plate; one end of the blank conveying cable is wound on the blank conveying rotary winding wheel, and the other end of the blank conveying cable is fixedly connected to the blank conveying cable holder; a plurality of three-bar linkage mechanisms are distributed on the blank conveying cable holder, wherein one end of each of the three-bar linkage mechanisms is connected with the blank conveying cable holder, and the other end of each of the three-bar linkage mechanisms is correspondingly connected with one blank shuttle. Wherein the mold moving incomplete gear set drives the mold moving rotary winding wheel to rotate, so that the mold moving cable is unwound or wound, thereby driving the male mold to move up or down through the male mold supporting plate to realize mold opening or closing. In the process, the blank conveying incomplete gear set drives the blank conveying rotary winding wheel to rotate (the mold moving rotary winding wheel and the blank conveying rotary winding wheel alternately operate), so that the blank conveying cable is unwound or wound, thereby driving the blank conveying cable holder to move up or down and driving the blank shuttle through the three-bar linkage mechanism to enter into or exit from the lower part of the male mold. The blank in the blank shuttle is provided by a feeding device located therebelow.

[0033] A blank-conveying cable-holder supporting column is arranged in the middle of the blank conveying cable holder, and provided with a blank shuttle supporting frame on the lower periphery, with each of the blank shuttles distributed on the blank shuttle supporting frame; the blank conveying cable holder, the blank-conveying cable-holder supporting column and the blank shuttle supporting frame form a blank conveying cable mechanism. Wherein the blank-conveying cable-holder supporting column is arranged mainly for providing more precise guidance and support for the up and down movement of the blank conveying cable holder, and also for providing guidance and support by using the blank shuttle supporting frame for each of the blank shuttles to enter into or exit from the bottle cap mold.

[0034] A linkage bar supporting holder, provided inside with a return spring, is further arranged in the middle of the blank-conveying cable-holder supporting column, and respectively connected with each of the three-bar linkage mechanisms. The setting of the linkage bar supporting holder can make the operation of each of the three-bar linkage mechanisms more stable, so that the blank shuttle can be accurately positioned when feeding.

[0035] An ejection plate is arranged in parallel above the male mold supporting plate, and a first mold moving spring is disposed between the ejection plate and the male mold supporting plate. The ejection plate is provided on the outer circumference with a plurality of ejection rods, each of which is correspondingly located on one side of one male mold. The ejection plate and the first mold moving spring are arranged to realize the spring energy storage while the mold is being opened, and meanwhile the ejection plate provides support for each of the ejection rods, so that the ejection rod can quickly eject the bottle cap product when the mold is opened.

[0036] A mold moving supporting plate is arranged in parallel above the ejection plate, and a second mold moving spring is arranged between the mold moving supporting plate and the ejection plate. The male mold supporting plate is provided with a compression molding oil cylinder, whose piston passes through the ejection plate to be located in the second mold moving spring. The compression molding oil cylinder is provided at the bottom with a compression molding oil guiding plate and a compression molding switch valve, and a pressure relief oil guiding plate is arranged at the bottom of the compression molding oil guiding plate.

[0037] In order to further realize the isostatic pressing energy storage while the mold is being opened, the mold moving supporting plate is also provided with an oil tank, and the male mold supporting plate is provided with an energy storage oil cylinder, with the front drive piston of the energy storage oil cylinder passing through the ejection plate to get connected with the oil tank. A pressure relief valve is provided on one side of the energy storage oil cylinder. The energy storage oil cylinder can also be externally connected to a pressurized positioning device through the pressure relief valve. The pressurized positioning device, which has the same specific structure as the existing one in the market, comprises a pressurized positioning bolt, a pressurized positioning spring and a pressurized positioning bolt reset disk, and can be used to control the pressure relief valve to be on/off to limit the front drive piston.

[0038] A method for batched compression molding of rubber and plastic products by means of multiple mold cavities implemented by above device is as follows: According to the method, alternate operation of a blank shuttle and a male mold that is in a bottle cap mold is controlled by means of engagement of two incomplete gear sets; besides, in the engagement process of the two incomplete gear sets, mold opening motion, isostatic pressing energy storage and spring energy storage are implemented by means of the engagement characteristic of the incomplete gear sets, and fast mold closing and compression molding are implemented by means of the non-engagement characteristic, isostatic pressing energy storage and pressurization of the incomplete gear sets. A three-bar linkage mechanism is disposed between the incomplete gear set and the blank shuttle, and the incomplete gear set uses the three-bar linkage mechanism to control the blank shuttle to quickly and synchronously convey a blank to a master mold in the bottle cap mold. The blank shuttle and the male mold have the same motion period. The two incomplete gear sets are connected to the same power source through the bevel gear set on one side, and the spur gear set and the bevel gear set on the other side serve as a power transmission unit between the two incomplete gear sets.

[0039] The above-mentioned method and device for batched compression molding of rubber and plastic products by means of multiple mold cavities has the following principle when used for production: When the mold moving incomplete gear set is engaged, the motor as the power source drives the mold moving rotary winding wheel to rotate, and the mold moving cable pulls the male mold supporting plate up to realize the mold opening and at the same time get the bottle cap products ejected. In the process, the first mold moving spring is compressed to store energy, and the energy storage oil cylinder also stores energy, with the stored energy used for pressurized compression molding and pressure retention during mold closing. When the mold opening is completed, the blank conveying incomplete gear set is disengaged, and the three-bar linkage mechanism is driven to expand by the blank conveying rotary winding wheel, the blank conveying cable and the blank conveying cable holder, thereby driving the blank shuttle to shuttle out of the bottle cap mold for cutting the blank. Then the blank is blown to the master mold by the gas through a gas conduit inside the blank shuttle, and next the blank shuttle remains stationary until the blank conveying incomplete gear set is re-engaged. When the incomplete gear set is re-engaged, the three-bar linkage mechanism retracts to drive the blank shuttle to shuttle into the bottle cap mold. At this time, the mold moving incomplete gear set is disengaged, the ejection plate and the male mold supporting plate are moved down respectively by the ejecting force of the first mold moving spring and the second mold moving spring to perform mold closing, and the pressure oil flows from the energy storage oil cylinder into the compression molding oil cylinder for pressurized compression molding and pressure retention until the mold moving incomplete gear set is re-engaged. In the above process, the blank shuttle and the male mold have the same motion period that is generally designed to be 2 s.

[0040] The present invention can be better implemented as described above, and the above example is merely preferred one of the present invention and not intended to limit the scope of the present invention; that is, all equivalent changes and modifications made in accordance with the present invention are covered by the scope as claimed in the claims of the present invention.