Die assembly pressure maintaining mechanism

Abstract

The utility model relates to a die assembly pressure maintaining mechanism which is used for providing stable pressure for a lower die plate and comprises a bottom plate located below the lower die plate, and at least one cavity formed by sinking downwards is formed in the upper surface of the bottom plate; the piston body is matched with the cavity, the lower end of the piston body is arranged in the cavity, the side surface of the piston body is in sealing sliding fit with the side surface of the cavity, a flow channel for hydraulic oil to pass through is formed in the piston body, one end of the flow channel is communicated with the outside of the cavity, and the other end of the flow channel is communicated with the lower end face of the piston body. And the upper end of the piston body is connected with the lower template.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mold injection equipment, and relates to a mold clamping pressure maintaining mechanism. BACKGROUND

[0002] The mold is used for injection, blow molding, extrusion, die casting or forging forming, smelting, stamping and the like to obtain various molds and tools for the required products in industrial production, and the mold is usually composed of an upper mold and a lower mold.

[0003] In the injection molding process, the fluid injection body is in the mold, and the liquid will expand in volume during the cooling and solidification process. A pressure needs to be provided to the mold for a certain period of time for pressure maintaining operation in the mold clamping state. The traditional equipment usually uses an oil cylinder for pressure maintaining operation. Since the stroke of the oil cylinder is large, the oil consumption is very large, and the pressure is unstable. A structure that needs to provide a quick response and consumes less oil is needed to provide the pressure maintaining function of the mold. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the problems in the related art, the application aims to provide a mold clamping pressure maintaining mechanism with a short stroke and a quick pressure response, and a small amount of oil consumption and stable pressure.

[0005] The application is achieved by the following technical solution.

[0006] The technical solution provides a mold clamping pressure maintaining mechanism for providing stable pressure to the lower mold plate, which comprises

[0007] A bottom plate located below the lower mold plate, and an upper surface of the bottom plate is provided with at least one cavity formed by being concave downward;

[0008] A piston body matched with the cavity, a lower end of the piston body is located in the cavity, a side surface of the piston body is in sealing sliding cooperation with a side surface of the cavity, an inner part of the piston body is provided with a flow channel for hydraulic oil, one end of the flow channel is communicated with an outside of the cavity, and the other end is communicated with a lower end surface of the piston body, and an upper end of the piston body is connected with the lower mold plate.

[0009] The technical effect of the technical solution is that the cavity is formed on the bottom plate, the bottom plate is used as a cylinder body, the piston body is directly connected with the lower mold plate, the linkage structure is omitted, the structure is simple and compact, the occupied space is small, the mold can be quickly clamped and pressure maintained, the stroke of the piston body is short, the oil consumption is very small, and the provided pressure is large.

[0010] In one or more embodiments, the inner side surface of the chamber is provided with an annular groove, and a sealing ring is arranged in the annular groove and slides with the piston body.

[0011] In one or more embodiments, the piston body is a cylindrical structure with a closed lower end.

[0012] In one or more embodiments, the upper end of the piston body is provided with a plurality of support feet arranged circumferentially around the center, and the support feet are fixedly connected to the lower die plate.

[0013] In one or more embodiments, the lower surface of the lower die plate is provided with a positioning groove, the upper end of the piston body is arranged inside the positioning groove, and the upper end of the piston body cooperates with the positioning groove.

[0014] In one or more embodiments, the number of chambers and piston bodies is four.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the figures, and wherein:

[0017] Figure 1 is a schematic view of a complex mold flipping and molding machine shown in an embodiment of the present application.

[0018] Figure 2 is an exploded schematic view of a mold clamping and pressure maintaining mechanism shown in an embodiment of the present application.

[0019] Figure 3 is a schematic view of a lower die plate shown in an embodiment of the present application.

[0020] Figure 4 is a schematic view of a piston body shown in an embodiment of the present application.

[0021] Figure 5 is a cross-sectional schematic view of a piston body shown in an embodiment of the present application.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 11 - frame; 111 - stud; 12 - upper die plate; 13 - lower die plate; 131 - positioning groove; 14 - bottom plate; 141 - chamber; 15 - piston body; 151 - flow channel; 152 - support foot; 16 - sealing ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0025] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0026] As shown in Figure 1 The present embodiment shows a complex mold flipping and molding machine, which comprises a rack 11, an upper mold plate 12 and a lower mold plate 13. The rack 11 comprises four threaded studs 111. The upper mold plate 12 is arranged on the threaded studs 111 and moves vertically. The upper mold plate 12 is provided with an upper mold. The lower mold plate 13 is provided with a lower mold. When the upper mold plate 12 drives the upper mold to move downward and combine with the lower mold, a pressure needs to be provided for the mold to perform a pressure maintaining operation for a period of time. The pressure for pressure maintaining comes from a mold closing and pressure maintaining mechanism.

[0027] As shown in Figures 2 to 5 The mold closing and pressure maintaining mechanism of the present embodiment is used to provide a stable pressure for the lower mold plate 13. The mold closing and pressure maintaining mechanism comprises a bottom plate 14 and a piston body 15. The upper surface of the bottom plate 14 is provided with at least one cavity 141 formed by downward recessing. The lower end of the piston body 15 is arranged in the cavity 141. The side surface of the piston body 15 is in sealing sliding fit with the side surface of the cavity 141. The inside of the piston body 15 is provided with a flow channel 151 for hydraulic oil. One end of the flow channel 151 is in communication with the outside of the cavity 141, and the other end is in communication with the lower end surface of the piston body 15. The upper end of the piston body 15 is connected with the lower mold plate 13.

[0028] The mold closing and pressure maintaining mechanism of the present embodiment forms the cavity 141 on the bottom plate 14. The bottom plate 14 serves as a cylinder body. The piston body 15 is directly connected with the lower mold plate 13, so that the linkage structure is omitted. The structure is simple and compact, occupies very small space, and can quickly close and maintain pressure. The stroke of the piston body 15 is short, the oil consumption is very small, and the provided pressure is large.

[0029] In the present embodiment, the inner side surface of the cavity 141 is provided with an annular groove. A sealing ring 16 is arranged in the annular groove. The sealing ring 16 slides with the piston body 15.

[0030] In the present embodiment, the piston body 15 is a cylindrical structure with a closed lower end. The flow channel 151 is arranged in the relatively thick side wall. The upper end opening of the flow channel 151 is in communication with an oil supply device.

[0031] In the embodiment, the upper end of the piston body 15 is provided with a plurality of support feet 152, which are arranged in a circle around the center and are fixedly connected to the lower die plate 13 by bolts 17. The lower surface of the lower die plate 13 is provided with a positioning groove 131, and the upper end of the piston body 15 is arranged inside the positioning groove 131, and the upper end of the piston body 15 cooperates with the positioning groove 131.

[0032] In the embodiment, the number of the chambers 141 and the piston bodies 15 is four, which are arranged in a square at the center of the bottom plate 14. Of course, the number can also be two, three, five, six, etc., which can be selected and arranged according to actual needs.

[0033] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application, or improvement of the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the disclosed embodiments.

Claims

1. A clamp holding mechanism for providing a stable pressure to a lower die plate (13), characterized by, Comprising a bottom plate (14) located below the lower die plate (13), an upper surface of the bottom plate (14) being provided with at least one cavity (141) formed by being concave downward; a piston body (15) matched with the cavity (141), a lower end of the piston body (15) being located in the cavity (141), a side surface of the piston body (15) being in sealing sliding fit with a side surface of the cavity (141), an inside of the piston body (15) being provided with a flow channel (151) for hydraulic oil to pass through, one end of the flow channel being communicated with an outside of the cavity (141), the other end being communicated with a lower end surface of the piston body (15), an upper end of the piston body (15) being connected with the lower die plate (13).

2. The clamp hold mechanism according to claim 1, characterized by, An inside surface of the cavity (141) is provided with an annular groove, a sealing ring being arranged in the annular groove, the sealing ring being in sliding fit with the piston body (15).

3. The clamp hold mechanism according to claim 1, wherein The piston body (15) is a cylindrical structure with a closed lower end.

4. The clamp hold mechanism according to claim 1, wherein The upper end of the piston body (15) is provided with a plurality of supporting feet (152), the plurality of supporting feet (152) being arranged in a circumferential manner around the center, the supporting feet (152) being fixedly connected with the lower die plate (13).

5. The clamp hold mechanism according to claim 1, wherein A lower surface of the lower die plate (13) is provided with a positioning groove, the upper end of the piston body (15) being located in the inside of the positioning groove, and the upper end of the piston body (15) being matched with the positioning groove.

6. The clamp hold mechanism of claim 1 wherein, The number of the cavity (141) and the number of the piston body (15) are both four.

Images