CN201455192U

CN201455192U - Automatic exhaust top-core mechanism

Info

Publication number: CN201455192U
Application number: CN200920123548XU
Authority: CN
Inventors: 王社松
Original assignee: NINGBO QIANGSHENG MACHINERY MOULD CO Ltd
Current assignee: NINGBO QIANGSHENG MACHINERY MOULD CO Ltd
Priority date: 2009-06-26
Filing date: 2009-06-26
Publication date: 2010-05-12
Anticipated expiration: 2019-06-26

Abstract

The utility model discloses an automatic exhaust top-core mechanism which is arranged on an upper core box (6) of a hot core box and comprises a top rod (1), a spring (2) and an end cover (3). The top rod (1) is arranged in a mould body (12) of the upper core box (6); the upper end of the top rod (1) is provided with the spring (2); the end cover (3) is fixed above the top rod (1) through a screw (4); the top rod (1) is in clearance fit with the mould body (12); and the lower end of the top rod (1) is provided with a plurality of exhaust grooves (8). During designing a mould of the complex sand-core hot core box, the utility model decreases the number of sand shooting openings of the upper core box (6) and prevents turbulent flows caused by that multiple sand shooting openings generate air flow interlacement inside the upper core box (6), and avoids unreal sand shooting and is beneficial to the exhaust of the hot core box.

Description

Automatic vent plunger tip mechanism

Technical field

The utility model relates to the manufacturing field of core, is a kind of automatic vent plunger tip mechanism that is used to cast the core shooting hot box specifically.

Background technology

Adopt core, the especially cylinder body of casting core shooting hot box mould production, the sand core of water jacket of cylinder cap, it is complex-shaped, and the sectional dimension of core is little, and the core percent defective is very high in the production process.Hot box comprises core box and following core box, hot box is generally lower open die, penetrate the sand mouth at patrix, to penetrate the sand plate when penetrating sand moves on to and penetrates Sha Kou, and penetrating the sand plate is provided with and penetrates Sha Zui, penetrate the sand plate and penetrate sand toward penetrating in the sand mouth by penetrating the sand mouth, penetrate and to penetrate the sand plate behind the sand and remove, after treating that core solidifies, upper plate is moved on to the plunger tip position, described plunger tip position is for penetrating Sha Kou, go up the plunger tip plate during die sinking by the synchronously downward plunger tip of superincumbent several upper ejector pins is set, core box is opened up and down, and core is stayed counterdie, descends plunger tip work to eject core at last.When the design hot box, in order to guarantee that the patrix core can steadily eject, the more last plunger tip bar of general design, because upper ejector pin is an one-to-one relationship with penetrating the sand mouth, the more sand mouth of penetrating causes the hot box internal gas flow staggered when penetrating sand easily, form turbulent flow, easily cause gas can not arrange, core is penetrated unreal; And some position is less, should not open and penetrate Sha Kou, and this position is also penetrated unreal easily.At patrix venting plug is installed, can be solved above phenomenon, but, easily cause core fracture and partial top not to go out phenomenon because the partial cross section of this type of core is less.

The utility model content

The technical problems to be solved in the utility model is, provide a kind of be used for hot box can prevent that to penetrate sand unreal and help the automatic vent plunger tip mechanism of exhaust.

Technical solution of the present utility model is, a kind of automatic vent plunger tip mechanism of following structure is provided, be installed on the last core box of hot box, comprise push rod, spring, end cap, push rod is installed in the mould of core box, spring is equipped with in the upper end of push rod, and end cap is fixed on the top of push rod by screw, is matched in clearance between described push rod and the mould.

Adopt above structure, the utility model compared with prior art has the following advantages: adopt the utility model structure, when the complicated core hot box mould of design, can reduce and go up the quantity that core box is penetrated the sand mouth, prevent that more to penetrate core box internal gas flow that Sha Kou causes staggered and form turbulent flow, avoid penetrating the unreal phenomenon of sand.

As improvement, have many air discharge ducts on the lower end of described push rod, help the exhaust of hot box like this.

Description of drawings

Fig. 1 is the structural representation of the utility model automatic vent plunger tip mechanism.

Fig. 2 is installed in structural representation on the hot box for the utility model.

As shown in the figure 1, push rod, 2, spring, 3, end cap, 4, screw, 5, automatic vent plunger tip mechanism, 6, go up core box, 7, core box down, 8, air discharge duct, 9, penetrate Sha Kou, 10, upper plate, 11, core, 12, die ontology.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Automatic vent plunger tip of the present utility model mechanism, be installed on the last core box 6 of hot box, comprise push rod 1, spring 2, end cap 3, push rod 1 is installed in the die ontology 12 of core box 6, spring 2 is equipped with in the upper end of push rod 1, end cap 3 is fixed on the top of push rod 1 by screw 4, is matched in clearance between described push rod 1 and the die ontology 12; The lower end of described push rod 1 has many air discharge ducts 8.

Operation principle of the present utility model is: when hot box is made core, the pressure that is pneumatically is injected precoated sand or cold sand in the core box, the general sand pressure of penetrating is 0.2-0.5MPa, when penetrating sand, form certain pressure in the core box, under the effect of pressure, push rod 1 moves upward and compresses spring 2, when hot box was opened, the elastic force of spring 2 ejected push rod automatically; Because the lower end of push rod 1 has air discharge duct 8, makes push rod 1 have the effect of exhaust concurrently.

Claims

1. automatic vent plunger tip mechanism, be installed on the last core box (6) of hot box, it is characterized in that: comprise push rod (1), spring (2), end cap (3), push rod (1) is installed in the die ontology (12) of core box (6), spring (2) is equipped with in the upper end of push rod (1), end cap (3) is fixed on the top of push rod (1) by screw (4), is matched in clearance between described push rod (1) and the die ontology (12).

2. automatic vent plunger tip according to claim 1 mechanism, it is characterized in that: the lower end of push rod (1) has many air discharge ducts (8).