Vacuum testing machine for sealing performance of mold cavity

Abstract

The utility model relates to a mould cavity leakproofness vacuum testing machine, comprising a pipeline and an electric control mechanism, the pipeline is successively provided with a vacuum pressure sensor, a stop valve and a vacuum pump along an air flow direction, the electric control mechanism comprises a controller, the vacuum pressure sensor outputs an electric signal to the controller, and the controller is connected with the stop valve. The controller controls opening and closing of the stop valve and starting and stopping of the vacuum pump according to the electric signals. The pipeline inlet of the vacuum testing machine is connected to the mold, the vacuum pump is used for generating negative pressure and sucking air into the cavity of the mold, so that the vacuum degree in the cavity is continuously increased, the stop valve and the vacuum pump are automatically controlled to be closed when the vacuum degree of the pipeline inlet meets the testing requirement, and then the pressure of the mold is maintained; therefore, whether the air leakage phenomenon exists in the mold cavity or not is confirmed, and working energy consumption is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sealing test, especially relates to a mould cavity sealing vacuum testing machine. BACKGROUND

[0002] Mould is the main device for carrying out die casting or injection molding process. Mould is combined by movable mould core and static mould core to form a cavity. The die casting fluid or injection fluid is injected into the cavity from the inlet of the mould, and then the fluid material is cooled and hardened to form a product. In order to improve the molding efficiency, sometimes an air extraction channel is arranged on the opposite side of the inlet of the cavity, so that a negative pressure can be formed in the cavity to make the fluid material fill the cavity space faster. Because the movable mould core and the static mould core are matched by the parting surface, only the air extraction channel can exhaust air in the normal state. If the sealing performance of the cavity is poor, air can enter from other positions after the two mould cores are combined, so that the vacuum degree will be reduced, resulting in the slow diffusion speed of the fluid material. In order to confirm that there is no above problem, the mould needs to be detected for sealing performance before use, that is, the air extraction channel is extracted to a certain vacuum degree under the condition that the inlet is blocked, and then whether the vacuum degree in the air extraction channel can be maintained is detected.

[0003] At present, the air extraction devices used in this occasion on the market are mostly used to provide negative pressure in the mould forming process. For example, CN103434080A, a mould vacuum extraction device used in an injection molding machine, CN205732880U, a die casting mould vacuum extraction device, and CN218366277U, an injection mould exhaust system. These devices only need to maintain air extraction according to the working time sequence, and cannot be used to detect the air leakage of the mould.

[0004] Therefore, it is necessary to provide a device specially used for detecting the sealing performance of the mould cavity to solve the above problems. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a mould cavity sealing vacuum testing machine, which can detect the air suction end point through a vacuum gauge, and then maintain pressure, so as to confirm whether there is air leakage phenomenon in the mould cavity.

[0006] The utility model realizes the above-mentioned purpose through the following technical scheme: a mould cavity sealing vacuum testing machine, comprising a pipeline and an electric control mechanism, wherein the pipeline is sequentially provided with a vacuum pressure sensor, a stop valve and a vacuum pump along the air flow direction, the electric control mechanism comprises a controller, the vacuum pressure sensor outputs an electric signal to the controller, and the controller controls the opening and closing of the stop valve and the start and stop of the vacuum pump according to the electric signal.

[0007] Specifically, it further comprises a shell surrounding the pipeline, and the electric control mechanism further comprises a display screen arranged at the upper portion of the shell, which displays the pressure value measured by the vacuum pressure sensor and the start-stop state of the vacuum pump.

[0008] Further, the lower portion of the shell is provided with a base and four universal casters, and the pipeline is arranged on the base, and the universal casters are arranged below the four corners of the base.

[0009] Further, the inlet section of the pipeline is a hose, and the inlet of the hose is arranged on the back of the shell.

[0010] Specifically, the inlet of the vacuum pump is provided with an air filter.

[0011] Specifically, the outlet side of the stop valve is provided with a pressure gauge.

[0012] The beneficial effects of the technical scheme of the utility model are as follows:

[0013] The pipeline inlet of the vacuum testing machine is connected to a mold, and the vacuum pump is used to generate negative pressure to inhale the cavity of the mold, so that the vacuum degree in the cavity continuously increases, and when the vacuum degree of the pipeline inlet reaches the test requirement, the stop valve and the vacuum pump are automatically controlled to be closed, and then the mold is pressure-kept, so that it is confirmed whether the mold cavity has air leakage phenomenon, and the working energy consumption is saved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of the mold cavity sealing vacuum testing machine of the embodiment;

[0015] Figure 2 It is a position relationship diagram of the pipeline and the lower part of the shell;

[0016] Figure 3 It is a control structure diagram of the mold cavity sealing vacuum testing machine of the embodiment.

[0017] Marked in the figure:

[0018] 100-vacuum testing machine,

[0019] 1-pipeline, 11-hose, 12-vacuum pressure sensor, 13-stop valve, 14-pressure gauge, 15-air filter, 16-vacuum pump;

[0020] 2-electric control mechanism, 21-controller, 22-display screen;

[0021] 3-shell, 31-universal caster, 32-base;

[0022] 200-mold, 201-cavity. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to specific embodiments.

[0024] Example:

[0025] like Figure 1 As shown, the present invention provides a mold cavity sealing vacuum testing machine 100, which includes a pipeline 1, an electrical control mechanism 2, and a housing 3.

[0026] like Figures 1 to 3 As shown, a hose 11, a vacuum pressure sensor 12, a shut-off valve 13, a pressure gauge 14, an air filter 15, and a vacuum pump 16 are sequentially arranged along the airflow direction on the pipeline 1.

[0027] The inlet of pipe 1 connects to mold 200. Vacuum pump 16 generates negative pressure to draw air into cavity 201 of mold 200, thereby continuously increasing the vacuum level within cavity 201. At this time, the pressure in the first half of pipe 1 at the inlet side of shut-off valve 13 is the same as the pressure inside cavity 201, so vacuum pressure sensor 12 measures the vacuum level inside cavity 201. When shut-off valve 13 is closed, pressure gauge 14 measures the pressure in the second half of pipe 1 at the outlet side of shut-off valve 13. The vacuum level can be directly displayed on the gauge, which does not need to be observed normally, but only needs to be checked during maintenance. The inlet section of pipe 1 is a flexible hose 11 to facilitate the placement of pipe 1 inlet on housing 3. The inlet of flexible hose 11 is generally located on the back of housing 3, so that the pipe between flexible hose 11 and mold 200 is less likely to be bumped. Because there may be solidified residue of the molding fluid inside the mold 200, which can be harmful to the vacuum pump 16, an air filter 15 is required to be installed at the inlet of the vacuum pump 16 to filter out impurities in the intake air, thereby protecting the normal operation of the vacuum pump 16 and extending its service life.

[0028] like Figure 1 and Figure 3 As shown, the electronic control mechanism 2 includes a controller 21 and a display screen 22. The vacuum pressure sensor 12 outputs an electrical signal to the controller 21, and the controller 21 controls the opening and closing of the shut-off valve 13 and the start and stop of the vacuum pump 16 according to the electrical signal. The display screen 22 is located on the upper part of the housing 3, and displays the pressure value measured by the vacuum pressure sensor 12 and the start and stop status of the vacuum pump 16.

[0029] The main function of the electric control mechanism 2 is to automatically control the closing of the stop valve 13 and the vacuum pump 16 when the vacuum degree at the inlet of the pipeline 1 reaches the test requirement, and then to keep the mold 200 in the pressure maintaining state, so as to confirm whether the mold 200 cavity 201 has the air leakage phenomenon, and to save the working energy consumption. The machine shell 3 is used to protect and support the pipeline 1 and the electric control mechanism 2. The overall height of the machine shell 3 is lower than that of an adult, so the display screen 22 is arranged at the upper part of the machine shell 3 and is inclined to the operating direction of the personnel by a small angle. The display screen 22 can display the working state of the vacuum testing machine 100, especially the real-time vacuum degree at the cavity 201 side and whether the vacuum pump 16 is idling. Under normal circumstances, the controller 21 can automatically close the stop valve 13 and the vacuum pump 16 after the vacuum degree of the cavity 201 reaches the standard; if the vacuum degree of the cavity 201 cannot be maintained at the set level within the set time interval, it proves that the mold 200 has poor sealing performance; if the pressure maintaining has been started, but the vacuum pump 16 is still working, it can be closed urgently through the controller 21. The display screen 22 can display the sealing degree detection result.

[0030] As shown in Figure 1 and Figure 2 , the lower part of the machine shell 3 is provided with a base 32 and four universal casters 31, the pipeline 1 is installed on the base 32, and the universal casters 31 are located below the four corners of the base 32.

[0031] The universal casters 31 enable the whole vacuum testing machine 100 to be freely moved, so as to meet the use requirements of multiple molds at different positions in the factory. The base 32 can provide bottom support for the pipeline 1.

[0032] The working process of the vacuum testing machine 100 is as follows: the inlet of the pipeline 1 is connected to the mold 200, when the mold 200 is closed, the pipeline 1 and the cavity 201 form a closed space. The stop valve 13 is opened and the vacuum pump 16 is started, the air in the closed space is sucked away, and the vacuum degree in the closed space continuously increases. The vacuum pressure sensor 12 and the pressure gauge 14 can respectively detect the pressure information on both sides of the inlet and outlet of the stop valve 13, wherein the vacuum pressure sensor 12 converts the vacuum degree information into an electric signal and transmits it to the controller 21, and the pressure gauge 14 is used to detect whether the vacuum pump 16 normally provides the set vacuum pressure. The controller 21 controls the state of the stop valve 13 and the vacuum pump 16 according to the set detection vacuum degree, that is, when the vacuum degree reaches the set vacuum degree, the stop valve 13 is closed, the vacuum pump 16 is stopped, and the space in the inlet direction of the stop valve 13 enters the pressure maintaining state. If the vacuum degree detected by the vacuum pressure sensor 12 can be maintained above the set vacuum degree after the set time, the sealing performance is qualified; otherwise, the sealing performance is unqualified, and an error needs to be reported.

[0033] The above merely describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, some modifications and improvements can be made, and these all belong to the protection scope of the present application.

Claims

1. A vacuum testing machine for mold cavity sealing, characterized in that: The device includes a pipeline and an electrical control mechanism. A vacuum pressure sensor, a shut-off valve, and a vacuum pump are sequentially arranged along the airflow direction on the pipeline. The electrical control mechanism includes a controller. The vacuum pressure sensor outputs an electrical signal to the controller, and the controller controls the opening and closing of the shut-off valve and the start and stop of the vacuum pump according to the electrical signal.

2. The mold cavity sealing vacuum testing machine according to claim 1, characterized in that: It also includes a housing surrounding the pipeline, and the electronic control mechanism includes a display screen located on the upper part of the housing, the display screen showing the pressure value measured by the vacuum pressure sensor and the start / stop status of the vacuum pump.

3. The mold cavity sealing vacuum testing machine according to claim 2, characterized in that: The lower part of the housing is provided with a base and four omnidirectional casters. The pipeline is installed on the base, and the omnidirectional casters are located at the four lower corners of the base.

4. The mold cavity sealing vacuum testing machine according to claim 2, characterized in that: The inlet section of the pipeline is a flexible hose, and the inlet of the flexible hose is located on the back of the housing.

5. The mold cavity sealing vacuum testing machine according to claim 1, characterized in that: An air filter is installed at the inlet of the vacuum pump.

6. The mold cavity sealing vacuum testing machine according to claim 1, characterized in that: A pressure gauge is provided on the outlet side of the shut-off valve.

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