Vacuum cleaner introduction
A vacuum cleaner is a cleaning device used to absorb dust. According to its structure, vacuum cleaner can be divided into vertical, horizontal and portable types. Working principle of a vacuum cleaner is to use an electric motor to drive blades to rotate at high speed, generate negative air pressure in a sealed shell, and absorb dust.

 

A vacuum cleaner is a smart home appliance product, generally used for home and car. Vacuum cleaner products and molds are generally more complex. Among injection molds, vacuum cleaner molds are second only to molds for OA office supplies such as automobiles, printers, and copiers.

 

Vacuum cleaner product introduction
A vacuum cleaner is a smart home appliance product, mainly composed of a body, a middle frame, a front cover, a rear cover, a dust cup, a dust barrel, a dust pipe, a handle, a motor cover and other parts.

 

Development trend of intelligent vacuum cleaners
With improvement of people's material living standards, smart home products such as vacuum cleaners and sweepers will become essential cleaning helpers for every family in the near future, just like white appliances. Products will also develop from primary intelligence to a higher degree of intelligence, gradually replacing manual cleaning. With continuous improvement of China's domestic living standards, vacuum cleaners and sweeping robots that have been sold in European and American markets have entered homes of ordinary people and are accepted by more and more people.

 

Analysis of Vacuum Cleaner Mould Structure
Vacuum cleaners are smart home appliances, and vacuum cleaner molds are generally more complex. Among injection molds, vacuum cleaner molds are second only to molds for OA office supplies such as automobiles, printers, and copiers. Structure of vacuum cleaner molds is quite distinctive, and some typical cases are selected below.

 

1. Vacuum cleaner dust bucket

 

Key points of structural design:
It is necessary to avoid interference between product and inner mold when ejecting
Application: When inner side of product is undercut and lifter cannot be designed, and there is space inside product, this inner row structure can be designed.
Application case: dust bucket of vacuum cleaner

 

Key points of structural design:
When slider is wrapped to green line position, product can be demoulded smoothly
When slider is wrapped to yellow line position, product will be detached from slider, but it will interfere with inner mold during ejection
Structure 1: Inner position (commonly known as reverse position)

 

Structure 2: Slide ejection

 

Application case: dust pipe of vacuum cleaner

 

Product Problem
For this type of product, if core pulling stroke of slide is designed like a regular slide, slide core pulling stroke will be very long and completely separated from product. Stroke needs to reach 350mm. How to solve this situation?
For this type of product, there are generally two types of slides, Figure 1 and Figure 2. Figure 1 requires rear mold to pull out product and then eject it, while Figure 2 requires slide to loosen product and eject it.

 

Structural analysis:
If core pulling stroke of slide is designed like a conventional slide, core pulling stroke will be very long. To completely detach from product undercut, stroke needs to reach 350mm, which will cause core pulling stroke of slide cylinder on the top side to be very long.
Since product is long and cylindrical, and there is a demoulding slope on inner side of product in direction of slide core pulling, slide only needs to be pulled a certain distance when pulling core, and slide can be pulled loose, so core pulling stroke does not need to reach 350mm.
For this product, slide core pulling stroke is 130mm. It is only pulled a certain distance. Inner side of long cylinder of product has been pulled loose, but it has not been completely detached. When product is ejected, how should it be ejected?

 

Structural analysis:
For this type of long cylindrical plastic parts, core pulling stroke of slider is 130mm, and it is only pulled a certain distance. Since there is a demoulding slope on the inside of plastic part, inside of long cylinder has been pulled loose when slider is pulled out 130mm.
But it is not completely detached, so ejection of this product adopts slide ejection structure. That is, when ejecting, product is ejected together with slide, and a piece of B plate needs to be inserted. Slide and reset rod are locked together for ejection. Mold structure is shown in figure above.
Structure 3: Cylinder conversion core pulling
Application case: vacuum cleaner floor brush base

 

 

 

For this type of cylinder conversion core pulling structure, special attention should be paid to cylinder retreat
Cylinder oil core

 

 

Oil cylinder + shovel base core pulling
When projected area of core pulling part of product is large, directly relying on cylinder to lock will not be able to withstand injection pressure of projected area of core pulling part, causing cylinder to retreat. Using cylinder + shovel base core pulling, core pulling movement is more stable and reliable, and cylinder is not easy to retreat.

 

Oil cylinder can convert core puller
When projected area of product core pulling is large, directly relying on cylinder locking will not be able to resist injection pressure of projected area of core pulling, and cylinder will act on shovel base to convert one or two forces. This core pulling mechanism is a cylinder conversion core pulling.