CN220019313U

CN220019313U - Device for measuring air permeability of riser

Info

Publication number: CN220019313U
Application number: CN202320947941.0U
Authority: CN
Inventors: 吴俊俊; 张尊乐; 潘成; 王学青; 于向东; 殷飞; 单长亮
Original assignee: CRRC Changzhou Auto Parts Co Ltd
Current assignee: CRRC Changzhou Auto Parts Co Ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-11-14
Anticipated expiration: 2033-04-24

Abstract

The utility model relates to a device for measuring the air permeability of a riser, which comprises a tool support and a working table surface paved above the tool support, wherein a product clamp is connected to the working table surface and is used for fixing a tested product, an air vent of the tested product is arranged opposite to through holes formed in the tool support and the working table surface, the through holes are connected with an air flow controller below the tool support through air pipes, the tail end of the air flow controller is connected with a switch controller below the tool support through the air pipes, and the tail end of the switch controller is connected with a pressure control valve and an air storage bag through the air pipes. First, a certain ventilation time is set on the switch controller, and the ventilation time value is determined according to the size of the detected riser product. And then measuring the throughput of the gas at a specified time in the gas flow controller, thereby calculating an accurate gas passing speed value. When the larger the gas passing speed value is, the better the gas permeability is, and the smaller the gas passing speed is, the worse the gas permeability is.

Description

Device for measuring air permeability of riser

Technical Field

The utility model relates to a device for measuring air permeability of a riser, and belongs to the technical field of auxiliary testing equipment for casting industry.

Background

In the foundry industry, risers are supplemental portions that are added to the top or sides of the casting to avoid defects in the casting. The cavity of the riser is used for storing a cavity of liquid metal, and the cavity is used for replenishing metal when the casting is formed, has the functions of preventing shrinkage cavity, shrinkage porosity, exhaust and slag collection, and is mainly used for solving the feeding problem of the riser. The types of the riser are divided into a common riser, an insulating riser and an exothermic riser, and the common riser is manufactured by a common model. The heat preservation riser is made of heat preservation materials, the solidification time of molten metal in the heat preservation riser is longer than that of a common riser, and the use cost of the molten metal can be saved. The exothermic riser is characterized in that an exothermic agent is added into a riser material, and the exothermic agent reacts to generate heat after molten metal is poured into the riser, so that the molten metal can be kept in a liquid state for a longer time, and the use of the molten metal is saved compared with that of the insulating riser.

However, in the casting field, the riser is an indispensable raw material and auxiliary material, and besides the high fire resistance, the high yield, the high heat insulation and the like, the riser is required to have enough air permeability, so that part of air in the sand mold cavity can be discharged through the riser, and a casting with excellent quality can be conveniently obtained. If the air permeability of the riser cannot meet the use requirement, after the high-temperature molten metal enters the riser, auxiliary materials in the riser can be burnt to generate gas, the gas cannot be completely discharged, and the condition that a casting generates invasive air holes to cause scrapping of a casting part is easy to occur, so that the production cost is obviously increased. Therefore, there is a need for an air permeability test device that can be used in a riser.

Disclosure of Invention

The summary of the utility model is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary of the utility model is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

Aiming at the problems and the defects existing in the prior art, the utility model aims to provide a device for measuring the air permeability of a riser, which mainly sets the ventilation time of a tested product through a switch controller and measures the air quantity passing through the set time by combining a gas flow controller so as to calculate an accurate air permeability value. And judging the air permeability of the tested riser according to the air permeability value, namely, the larger the air permeability value is, the better the air permeability is, and conversely, the smaller the air permeability value is, the worse the air permeability is. To solve the problems in the background art described above.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the device comprises a tool support, wherein a working table top is paved above the tool support, a product clamp is connected above the working table top, a tested product is clamped on the inner side of the product clamp, and a vent hole of the tested product is placed opposite to a through hole formed in the tool support and the working table top; the through hole is connected with a gas flow controller below the tool support through a gas pipe and is used for measuring the throughput of gas in the ventilation time; one end of the gas flow controller is connected with the switch controller below the tool support through a gas pipe and is used for setting the passing time of gas; one end of the switch controller is connected with the air compressor through an air pipe and is used for generating pressure gas.

According to the utility model, the tested product needs to be placed at a fixed position in the product clamp, and the product clamp can be used for preventing the tested product from moving left and right when the air permeability test is performed. When the product to be tested is placed, the product to be tested needs to be opposite to the through holes formed in the tool support and the working table surface, and the through holes are connected with the gas flow controller, the switch controller and the air compressor through air pipes. When the device is used, the air compressor is used for generating pressure gas required by the testing device, the switch controller is used for setting the passing time of the gas, and the gas flow controller is used for measuring the throughput of the gas in the ventilation time. The gas passing speed value (mL/s) can be calculated as: gas throughput (mL)/gas passage time(s), the gas permeability is better as the gas passage speed value is larger, and the gas permeability is worse as the gas passage speed value is smaller.

Preferably, an upper pressing support is connected above the working table, and one end of the upper pressing support abuts against the top end of the tested product. The tested product can be firmly fixed in the product clamp through the upper pressing support, and the tested product is prevented from moving up and down when the air permeability test is carried out.

Preferably, a buffer material layer is paved between the workbench and the product clamp. And a buffer material layer with the thickness of 5mm is paved between the working table surface and the product clamp, and is used for avoiding the riser from being damaged by the product clamp and the upper compression bracket when the air permeability test is carried out.

Preferably, a pressure control valve is connected between the switch controller and the air compressor and used for controlling a fixed pressure value of the front end passing through the gas. The pressure control valve is used for controlling the fixed pressure value of the gas passing through the front end, the gas pressure is controlled to be 0.6-0.65 MPa, and the ventilation test effect is optimal when the gas pressure in the interval is used for detecting products.

Preferably, one end of the pressure control valve is also connected with a gas storage bag through a gas pipe and is used for storing the pressure gas output by the air compressor at the rear end. The pressure gas emitted by the air compressor is collected through the gas storage bag to be used as the pressure gas for the whole air permeability test.

Preferably, the switch controller sets the time for the gas to pass through to be determined according to the size of the tested product. The switch controller consists of a time relay and a ball valve, the time relay is used for setting delay time, and the ball valve is combined for setting ventilation time when the switch controller is opened. When the time delay time set by the time relay is over, the ball valve switch is automatically closed, so that the ball valve in the set time is automatically opened or closed, and the specified time for passing the gas is met.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model has the characteristics of simple structure, convenient use and quick measurement, when in use, the product to be measured is placed on the workbench surface, the transverse position of the product to be measured is not moved through the product clamp, and the vertical position of the product to be measured is not moved by combining with the pressing support. When the tested product is placed, the vent hole of the tested product needs to be opposite to the through holes formed in the tool support and the working table surface, and the through holes are internally connected with the gas flow controller, the switch controller, the pressure control valve and the air compressor through air pipes. By setting the time for the gas to pass through the switch controller, the time for the gas to pass through is determined according to the size of the product to be tested. The throughput of gas for the vent time is measured with a gas flow controller to calculate an accurate gas throughput velocity value. The higher the gas passing speed value, the better the gas permeability, whereas the lower the gas passing speed, the worse the gas permeability. The method has the advantages that the detected product air permeability is higher in precision, the safety in use is higher, the defect brought by using the unqualified riser product can be effectively avoided, and the production yield is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the utility model and are not to be construed as unduly limiting the utility model.

In the drawings:

fig. 1: is a schematic diagram of the front view structure of the utility model;

fig. 2: is a schematic top view structure of the utility model;

fig. 3: is a schematic side view structure of the utility model.

Marked in the figure as: 1. a tool support; 2. a work table; 3. an upper compression bracket; 4. a tested product; 5. a product clamp; 6. a buffer material layer; 7. a pressure control valve; 8. a switch controller; 9. a gas flow controller.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be noted that, for convenience of description, only the portions related to the present utility model are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.

The utility model discloses a device for measuring the air permeability of a riser, and the device is described in detail below with reference to the accompanying drawings and with reference to the examples.

The device for measuring the air permeability of the riser is provided in this embodiment, as shown in fig. 1-3: the device comprises a tool support 1, wherein a working table surface 2 is paved above the tool support 1, a product clamp 5 is connected above the working table surface 2, a tested product 4 is clamped on the inner side of the product clamp 5, and a vent hole of the tested product 4 is placed opposite to through holes formed in the tool support 1 and the working table surface 2; the through hole is connected with a gas flow controller 9 below the tool support 1 through a gas pipe and is used for measuring the throughput of gas in the ventilation time; one end of the gas flow controller 9 is connected with the switch controller 8 below the tool support 1 through a gas pipe and is used for setting the passing time of gas; one end of the switch controller 8 is connected with an air compressor through an air pipe for generating pressure gas.

The embodiment further comprises that an upper pressing support 3 is connected above the working table 2, one end of the upper pressing support 3 abuts against the top end of the tested product 4, and a buffer material layer 6 is paved between the working table 2 and the product clamp 5. The upper pressing support 3 is of a U-shaped structure, one end of the upper pressing support is connected to the upper edge of the workbench surface 2, and the other end of the upper pressing support abuts against the top end of the tested product 4. The tested product 4 can be firmly fixed in the product clamp 5 through the upper pressing support 3, so that the tested product 4 is prevented from moving up and down when the air permeability test is performed, and the safety and stability during use are improved. And a buffer material layer 6 with the thickness of 5mm is paved between the product clamp 5 and the working table surface 2, so that the phenomenon that the riser to be tested is not easy to be pressed to be damaged when being used and placed can be avoided. The cushioning material layer 6 can be made of a material which is resistant to breakage, strong in wear resistance and has a certain strength so as to ensure that the cushioning material layer can withstand multiple impacts and vibrations in a use environment.

The embodiment further comprises that the rear end of the switch controller 8 is connected with the pressure control valve 7 through an air pipe, the fixed pressure value of the gas passing through the front end is controlled through the pressure control valve 7, the rear end of the pressure control valve 7 is also connected with the gas storage bag through the air pipe, and the gas output by the rear end air compressor is stored through the gas storage bag. The pressure control valve 7 is a valve for controlling and regulating the pressure in the system, and plays roles of regulating and fixing the pressure. The fixed pressure value of the gas passing through the front end is controlled by the pressure control valve 7, and the gas pressure is controlled to be 0.6-0.65 MPa, because the gas pressure in the interval has the best ventilation test effect when detecting products. The gas storage bag is used for temporarily storing gas and simultaneously plays a role in stabilizing pressure and releasing pressure. The air storage bag is connected with the air compressor to collect the pressure gas emitted by the air compressor so as to store the pressure gas used by the whole air permeability testing device, wherein the capacity of the air storage bag is set to be 50 liters.

The present embodiment further includes that the ventilation time set by the switch controller 8 is determined according to the size of the product 4 to be tested. The switch controller 8 in the utility model is composed of a time relay and a ball valve, the time relay is used for setting the delay time, and the ball valve is combined for setting the ventilation time when the valve is opened. When the time delay time set by the time relay is over, the ball valve switch is automatically closed, so that the ball valve in the set time is automatically opened or closed, and the specified time for passing the gas is met. The vent time set by the switch controller 8 is determined according to the size of the product to be tested, and here, we set the vent time to 15 seconds.

The application method of the utility model

Firstly, a tested product 4, namely a tested riser, is placed on a workbench surface, the transverse position of the tested riser is fixed by utilizing a product clamp 5, and the vertical position of the tested riser is fixed by utilizing an upper pressing bracket 3. The air compressor connected to the rear end of the air storage bag is opened to generate pressure air, then the pressure control valve 7, the switch controller 8 and the air flow controller 9 are opened, and a certain air passing time (in seconds) is set on the switch controller 8. Typically we set the vent time to 15s, which is the measurement time for the riser, and this time value is determined by the size of the riser product being measured. The gas throughput is measured by the gas flow controller 9 for a prescribed period of time, thereby calculating an accurate ventilation value, i.e., the gas passing speed. The gas passing speed is expressed as: gas throughput (mL)/gas ventilation time (S) =gas passage rate (mL/S), and is determined from the value of the gas passage rate. The larger the air permeability value, the better the air permeability, whereas the smaller the air permeability value, the worse the air permeability. Therefore, whether the air permeability of the detected riser is qualified or not can be judged through specific numerical values.

The following test experiments of the tested riser are carried out by adopting the structure of the utility model, and test experiment data are recorded as follows in table 1:

TABLE 1

As can be seen from the above experiments, the same size riser was used. When the gas passing time is set to 15s, an accurate gas passing speed value is calculated according to the gas amount passing by the gas flow controller measured for a prescribed time. From the above gas passing velocity values, it can be seen that: the riser 5 has the best air permeability, while the riser 4 has the worst air permeability, which should be judged as unacceptable.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is merely for convenience in describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In addition to the above embodiments, the present utility model may have other embodiments. It should be understood that modifications of the above-described embodiments, or equivalent substitutions of some technical features thereof may be made by those skilled in the art, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a measure permeability device of rising head which characterized in that: the device comprises a tool support (1), wherein a working table surface (2) is paved above the tool support (1), a product clamp (5) is connected above the working table surface (2), a tested product (4) is clamped on the inner side of the product clamp (5), and a vent hole of the tested product (4) is placed opposite to a through hole formed in the tool support (1) and the working table surface (2); the through hole is connected with a gas flow controller (9) below the tool support (1) through a gas pipe and is used for measuring the throughput of gas in the ventilation time; one end of the gas flow controller (9) is connected with the switch controller (8) below the tool support (1) through a gas pipe and is used for setting the passing time of gas; one end of the switch controller (8) is connected with the air compressor through an air pipe and is used for generating pressure gas.

2. The device for measuring the air permeability of a riser of claim 1, wherein: the upper part of the working table surface (2) is connected with an upper pressing support (3), and one end of the upper pressing support (3) is propped against the top end of the tested product (4).

3. The device for measuring the air permeability of a riser of claim 1, wherein: and a buffer material layer (6) is paved between the working table surface (2) and the product clamp (5).

4. The device for measuring the air permeability of a riser of claim 1, wherein: and a pressure control valve (7) is connected between the switch controller (8) and the air compressor and is used for controlling the fixed pressure value of the front end passing through the gas.

5. The device for measuring the air permeability of a riser of claim 4, wherein: one end of the pressure control valve (7) is also connected with an air storage bag through an air pipe and is used for storing pressure gas output by the air compressor at the rear end.

6. The device for measuring the air permeability of a riser of claim 1, wherein: the switch controller (8) sets the time for the gas to pass through to be determined according to the size of the tested product (4).