WO2022236971A1

WO2022236971A1 - Quenching apparatus and method for bottle-type container for thick-wall station

Info

Publication number: WO2022236971A1
Application number: PCT/CN2021/109666
Authority: WO
Inventors: 王艳辉; 王利民; 汪龙; 陈彦飞
Original assignee: 中材科技（苏州）有限公司
Priority date: 2021-05-14
Filing date: 2021-07-30
Publication date: 2022-11-17
Also published as: CN113265519B; CN113265519A

Abstract

Disclosed in the present invention is a quenching apparatus and method for a bottle-type container for a thick-wall station. The wall thickness of the bottle-type container for a quenched object is 40-50 mm. The apparatus consists of a double-surface spraying mechanism, a rotating mechanism and a pressing mechanism which are arranged on the basis of a quenching tank (filled with quenching liquid); the rotating mechanism supports, by using the set of supporting rollers, the bottom side of a product to be cooled, and drives said product to rotate; in the pressing mechanism, lower pressing wheels driven by an air cylinder abut against the upper surface of said product to perform the positioning of a rotation axial direction; and the double-surface spraying mechanism comprises outer surface spraying units distributed outside said product and inward inner surface spraying units distributed at two ends and aligned with a bottle mouth, and faces said product for synchronous uniform internal and external cooling. By applying the quenching solution of the bottle-type container of the present invention, under the optimized quenching process of the equipment mechanism, a cost utilization rate is improved, test of a product in a hydrogen environment can be realized, and stable and reliable performance can be achieved, such that the requirement of a rapid increase in the demand for bottle type-containers for a hydrogenation station is satisfied.

Description

A quenching device and quenching method for a bottle-type container used in a thick-walled station

technical field

The invention relates to a quenching solution for structure strengthening of steel pipe products, in particular to a brand-new quenching equipment and its implementation method for thick-walled products whose hardenability reaches the range of 40-50 mm, and belongs to the field of steel application technology.

Background technique

The current social development is inseparable from the development and application of various energy sources, although they are still put into use after oil extraction and chemical smelting. However, more and more countries and regions are focusing on the development and utilization of renewable energy and green energy. For example, solar energy is widely used in people's life and industrial production, and nuclear energy is widely used in power stations and various military ships. With the continuous advancement of science and technology, especially in the power of motor vehicles, which are closely related to people's lives, people are increasingly discovering the value of hydrogen energy. For example, the industry white papers issued by some countries disclose the overall goals of the hydrogen energy and fuel cell industries.

At present, the pressure levels of hydrogen refueling stations are 35MPa and 70MPa. The construction of hydrogen refueling stations of both specifications has just started. Because of the large capacity of the bottle container of 35Ma hydrogen refueling stations and high safety factor, it has become the preferred pressure level for building hydrogen refueling stations. Correspondingly, it is necessary to adopt a steel bottle container with a thickness greater than 40mm.

Under the new situation, higher requirements are put forward for the traditional process. However, the existing commonly used quenching mechanism is increasingly unable to meet the requirements, which are mainly reflected in two aspects: 1). The general hardenability of the existing process can only meet the steel pipe below 20mm. When the wall thickness increases, the performance cannot meet the design requirements, and the increase of the design pressure level of the bottle container is an inevitable trend, so it is necessary to solve the technical bottleneck of hardenability improvement. 2) Existing quenching for products is all external surface quenching, that is, the outer surface of the bottle is in contact with the quenching medium, the bottle mouth is closed at both ends, the inner surface of the bottle is not in contact with the quenching medium, and the cooling water cannot be uniform inside and outside, thus hindering hardening It is also an objective obstacle to the improvement of performance; to a certain extent, it is also easy to cause the product to deform. It can be seen that the research on related production processes is imminent.

Contents of the invention

In view of the needs of the above-mentioned prior art, in order to meet the needs of hardenability improvement to achieve a good effect, the present invention aims to propose a quenching device and quenching method for bottle-type containers used in thick-walled stations, in order to obtain bottle-type containers. High pressure demands.

The technical solution of the present invention to achieve one of the above objects is a quenching device for a bottle-type container used in a thick-walled station. It consists of double-surface spraying mechanism, rotating mechanism and pressing mechanism, wherein the quenching tank is filled with quenching liquid, and the rotating mechanism uses a set of supporting rollers to support the bottom side of the product to be cooled and drive the product to be cooled to rotate , the pressing mechanism utilizes the lower pressing wheel driven by the air cylinder to contact the upper surface of the product to be cooled to locate the rotation axis, and the double-surface spraying mechanism includes an outer surface spraying unit distributed outside the product to be cooled and distributed on two sides. The end is aligned with the spray unit on the inner surface of the bottle mouth, facing the product to be cooled and cooling both inside and outside synchronously.

Further, the outer surface spraying unit includes two or more nozzles parallel to the axial direction of the product to be cooled and through which the internal quenching liquid circulates, and the nozzles are evenly distributed within a 180° circumferential range of the lower side of the product to be cooled, And facing the product to be cooled, there are liquid spray grooves or liquid spray holes that are evenly distributed and scour the surface.

Further, the spout of the inner surface spray unit is located outside the bottle mouth of the product to be cooled, and the pump flow intensity is sufficient to fill the inner cavity of the product to be cooled with quenching liquid within 10 seconds.

Further, the rotating mechanism is provided with a set of idler rollers and a drive motor composed of driving rollers and driven rollers, and the set of idler rollers is parallel to the axial direction of the product to be cooled and supported tangentially on the surface, wherein the active The roller is driven to rotate by the drive motor, and the product to be cooled and the driven roller are driven to rotate accordingly.

Furthermore, the drive motor is integrated with a frequency converter with variable frequency and speed regulation.

Further, the pressing mechanism is provided with several pressing units in sections along the length direction of the product to be cooled, and any of the pressing units has a waterproof cooling layer integrally attached to the top of the quenching tank and its embedded assembly and Paired cylinders, guide rods and lower pressure wheels, the lower pressure wheels are driven and guided to expand and contract, and press against, roll and slide against the outer surface on both sides of the longitudinal axis section of the product to be cooled.

The technical solution to achieve the second objective of the present invention is a quenching method for a thick-walled bottle-type container, which is characterized in that the product to be cooled is transferred from the quenching furnace to the quenching tank by driving the translation mechanism through a control signal. The above quenching tank is equipped with quenching liquid, which is tangentially supported on a set of rollers of the rotating mechanism, and the cylinder set by the pressing mechanism is used to drive the lower pressure wheel to protrude along the guide rod and press against the upper side of the product to be cooled The outer surface, eliminating the floating state, and then the driving motor set by the rotating mechanism is driven by the driving roller, so that the product to be cooled continues to rotate, and the pump valve of the double-surface spraying mechanism is started at the same time, and the outer surface and the inner surface of the product to be cooled are sprayed synchronously. Drizzle and cool evenly.

Further, after the sample of the product to be cooled is sprayed synchronously and reaches the preset temperature, a performance index detection step is also included,

S1. Sampling is carried out in sections and positions from the sample;

S2. Conduct tests including metallography, grain size, tensile, decarburization layer, and impact on samples to obtain some performance indicators in the air environment,

S3. Obtain another part of performance indicators under hydrogen environment by at least including slow strain rate tensile test, fatigue fracture growth rate test, and fracture toughness test for sampling in hydrogen environment.

Furthermore, the sampling section includes three rings along the middle of the axial length and 200 mm from the circular arc transition section at both ends of the container, and the sampling and analysis positions include the bottom, side and top of each ring relative to the quenching tank .

The application of the quenching device and its process of the present invention has outstanding substantive features and significant progress: under the optimization of the original quenching equipment mechanism and quenching process, the product to be cooled is rotated and compressed, and the inner and outer surfaces are simultaneously quenched. The liquid spraying method improves cooling uniformity and cost utilization, and enables the product to pass the test in a hydrogen environment and achieve stable and reliable performance, thereby meeting the requirements of a sharp increase in the demand for bottle containers used in hydrogen refueling stations.

Description of drawings

Fig. 1 is a schematic diagram of the general assembly structure of the quenching device of the present invention in the quenching tank.

Fig. 2 is a structural perspective view from another angle of view of Fig. 1 .

Detailed ways

The specific implementation of the present invention will be further described in detail in conjunction with the following examples, so as to make the technical solution of the present invention easier to understand and grasp, thereby defining the protection scope of the present invention more clearly.

The present invention aims at improving the filling performance requirements of thick-walled bottle-type containers for the development and application of hydrogen energy, and analyzes and improves traditional quenching equipment and processes. What is innovatively proposed and claimed is a quenching device for thick-walled station-use bottle-type containers and In the quenching method, the working object is a bottle container with a wall thickness of 40-50mm. When the bottle-type container is in the quenching process and the bottle mouth is not further packaged, the main body is in the shape of a tube, and the two ends are in the shape of a radially narrowed bottle mouth and are axially penetrated.

Generally speaking, the quenching process includes two parts: heat preservation in a heating furnace and rapid cooling in a quenching tank. However, the present invention focuses on improving the latter part, which can be seen in the schematic diagrams and structural perspective views of the quenching tank from different angles of view as shown in Figure 1 and Figure 2 . The quenching device is composed of a double-surface spraying mechanism 3 , a rotating mechanism and a pressing mechanism 5 installed based on the layout of the quenching tank 1 . From the point of view of the main function design of each part, the rotation mechanism uses a set of supporting rollers to support the bottom side of the product 2 to be cooled and drive the product 2 to rotate. The main function is to stably support the quenching object and drive it to rotate, so that All parts of the surface have an equal opportunity to be sprayed with quenching liquid to reduce the temperature evenly. The pressing mechanism 5 utilizes the lower pressure wheel driven by the air cylinder to contact the upper surface of the product to be cooled to locate the rotation axis. Uniform cooling reliability. As the focus of the improvements, the double-surface spray mechanism includes an outer surface spray unit 31 distributed outside the product to be cooled and an inner surface spray unit 32 distributed at both ends to align with the mouth of the bottle inward. Its main function is Through the control of the pump valve, the product to be cooled can be cooled evenly inside and outside simultaneously. It can be seen that, using the quenching device to quench the bottle container, not only the inner and outer surfaces of the product can contact the quenching liquid at the same time or nearly at the same time, but also the product maintains a stable axial rotation, which completely eliminates the dead angle of the product surface contacting the quenching liquid , Reliably and reliably achieve uniform cooling of the product, so as to meet the hardenability of thicker-walled bottle containers and meet the filling requirements of hydrogen refueling stations.

More specifically, from the point of view of breaking through the traditional quenching process where only the outer surface is immersed in the quenching liquid, the outer surface spray unit 31 includes more than two nozzles parallel to the axial direction of the product to be cooled and through which the quenching liquid circulates. In the preferred embodiment shown in the figure, there are three nozzle pipes, which are evenly distributed in the circumferential range of 180° on the lower side of the product to be cooled 2, and are respectively provided with liquid spray tanks or spray liquids that are evenly distributed and scour the surface of the product to be cooled. hole (not shown). It can be understood that when the quenching hydraulic pressure in the nozzle reaches a certain level, it can be sprayed and circulated on the outer surface of the product through the spray tank or spray hole, so as to achieve the purpose of rapid cooling.

The spout of the inner surface spray unit 32 is located outside the bottle mouth of the product to be cooled, and the pump flow intensity is sufficient to fill the inner cavity of the product to be cooled with quenching liquid within 10 seconds. In this way, when the product to be cooled is pressed and rotated, it can quickly realize synchronous cooling from the inside to the outside in conjunction with the cooling of the outer surface.

Next, the rotating mechanism is provided with a set of idler rollers composed of driving rollers 41 and driven rollers 42 and a driving motor 43 . The group of supporting rollers is parallel to the axial direction of the product to be cooled and tangentially supported on the surface, and the driving roller is driven by the driving motor to rotate. In this way, the product to be cooled and the driven roller can be driven to rotate with the transmission, so that the outer surface of the product can be completely and repeatedly sprayed with quenching liquid with the rotation, and the deviation of the quenching effect caused by uneven spraying can be avoided. As a preferred setting, the driving motor 43 is integrated with a frequency converter with variable frequency and speed regulation, so as to meet the requirements of the speed on the uniformity of hardening at different cooling rates during the quenching and cooling process.

Furthermore, the above-mentioned pressing mechanism 5 is provided with several pressing units (five in the illustrated embodiment) in sections along the length direction of the product 2 to be cooled. Connected waterproof cooling layer 51 and its embedded assembly and paired cylinder 52, guide rod 53 and lower pressure wheel 54. Wherein, the lower pressing wheel 54 is driven and guided to expand and contract, and presses and rolls against the outer surface on both sides of the longitudinal axis section of the product to be cooled. The pressing mechanism needs to meet two technical requirements. One is to correspond to the supporting force of a group of rollers to be cooled. Floating, jumping and other phenomena that are not conducive to the improvement of quenching efficiency; the second is that the lower pressure wheel is in rolling contact with the outer surface of the product to be cooled. reduced to a minimum.

On the basis of the structural characteristics of the above-mentioned quenching device, it also brings about simultaneous improvements in the quenching process. In a nutshell, during the pre-quenching process, after the product is kept in a high-temperature heating furnace (that is, the quenching furnace) at 890°C for a certain period of time, it quickly exits the quenching furnace and enters the material ring of the translation mechanism. The quenching furnace discharges the rod; then the product to be cooled is quickly transferred from the quenching furnace to the quenching tank through the control signal to drive the translation mechanism. The cylinder set in the pressing mechanism drives the lower pressing wheel to protrude along the guide rod and press against the upper outer surface of the product to be cooled to eliminate the floating state, and then the driving motor set in the rotating mechanism is driven by the driving roller to make the product to be cooled Continuously rotate, start the pump valve of the double-surface spraying mechanism at the same time, spray the outer surface and inner surface of the product to be cooled synchronously, and cool evenly.

And after the sample of the product to be cooled is sprayed synchronously and reaches the preset temperature, it also includes the performance index detection step,

S1. Sampling is carried out from the sample in sections and locations; the sample length is about 3280mm, and the sampling section includes three rings in the middle of the axial length and 200mm near the arc transition section at both ends of the container, and the sampling analysis The location includes each ring below, side and above the quenching tank.

S2. Conduct tests including metallography, grain size, tensile, decarburization layer, and impact resistance on the samples, and obtain some performance indicators in the air environment. The test results all meet expectations and meet the design requirements.

S3. According to GB/T34542, GB/T228 and other standards for sampling, another part of the performance index under hydrogen environment is obtained by at least including slow strain rate tensile test, fatigue fracture growth rate test and fracture toughness test under hydrogen environment, and The test results also met expectations.

To sum up, the detailed description of the embodiment of the present invention highlights the innovative essence of the technical solution of the present invention, and has a breakthrough improvement: under the optimization of the original quenching equipment mechanism and the quenching process, the products to be cooled are subjected to rotation and compression. At the same time, it is equipped with the measures of synchronous quenching liquid spraying on the inner and outer surfaces, which can improve the uniformity of the cooling effect in a very short time, improve the cost utilization rate, and increase the gross profit by more than five times. It can realize the product to pass the test under the hydrogen environment. To achieve stable and reliable performance, and then meet the requirements of the sharp increase in demand for bottle containers used in hydrogen refueling stations.

In addition to the above-mentioned embodiments, the present invention can also have other implementations, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

A quenching device for a bottle-type container used in a thick-walled station, the wall thickness of the bottle-type container is up to 40-50mm, and it is characterized in that it consists of a double-surface spraying mechanism, a rotating mechanism and a pressing mechanism installed based on the layout of the quenching tank Composition, wherein, the quenching tank is equipped with quenching liquid, the rotating mechanism uses a set of supporting rollers to support the bottom side of the product to be cooled and drives the product to be cooled to rotate, and the pressing mechanism uses the lower cylinder driven by the set The pressure roller touches the upper surface of the product to be cooled and rotates axially. The double-surface spray mechanism includes an outer surface spray unit distributed outside the product to be cooled and an inner surface spray unit distributed at both ends to align with the bottle mouth inward. , for the product to be cooled to be cooled evenly inside and outside synchronously.
According to claim 1, the quenching device for a bottle-type container used in a thick-walled station is characterized in that: the outer surface spray unit includes more than two nozzles parallel to the axial direction of the product to be cooled and through which the internal quenching liquid circulates. The spray pipes are evenly distributed in the circumferential range of 180° on the lower side of the product to be cooled, and there are evenly distributed liquid spray grooves or liquid spray holes facing the product to be cooled to scour the surface.
According to claim 1, the quenching device for bottle-type containers used in thick-wall stations is characterized in that: the spout of the inner surface spray unit is located outside the bottle mouth of the product to be cooled, and the pump flow intensity is sufficient to be cooled within 10 seconds The inner cavity of the product is filled with quenching liquid.
According to claim 1, the quenching device for bottle-type containers used in thick-wall stations is characterized in that: the rotating mechanism is provided with a set of idler rollers and a drive motor composed of driving rollers and driven rollers, and the set of idler rollers Parallel to the axial direction of the product to be cooled and tangential to the surface, the driving roller is driven by the drive motor to rotate, and the product to be cooled and the driven roller are driven to rotate.
According to claim 4, the quenching device for bottle-type containers used in thick-wall stations is characterized in that: the drive motor is integrated with a frequency converter with variable frequency and speed regulation.
According to claim 1, the quenching device for bottle-type containers used in thick-wall stations is characterized in that: the compression mechanism is provided with several compression units in sections along the length direction of the product to be cooled, and any one of the compression units It has a waterproof cooling layer integrated with the top of the quenching tank and its embedded and assembled paired cylinders, guide rods and lower pressure wheels. The lower pressure wheels are driven and guided to expand and contract, and are on both sides of the longitudinal axis section of the product to be cooled Press, roll and slide against the outer surface.
A quenching method for a bottle-type container used in a thick-walled station, characterized in that the product to be cooled is transferred from the quenching furnace to a quenching tank by driving a translation mechanism through a control signal, and the quenching tank is equipped with a quenching liquid and tangentially supported On a set of rollers of the rotating mechanism, the cylinder set by the pressing mechanism is used to drive the lower pressure roller to protrude along the guide rod and press against the upper outer surface of the product to be cooled to eliminate the floating state, and then set by the rotating mechanism The drive motor is driven by the driving roller, so that the product to be cooled continues to rotate, and at the same time, the pump valve of the double-surface spray mechanism is activated to spray the outer and inner surfaces of the product to be cooled synchronously and cool evenly.
According to claim 7, the quenching method of the bottle-type container used in the thick-walled station is characterized in that: after the sample of the product to be cooled is sprayed synchronously to reach the preset temperature, it also includes the step of performing performance index detection,

S1. Sampling is carried out in sections and positions from the sample;

S2. Conduct tests including metallography, grain size, tensile, decarburization layer, and impact on samples to obtain some performance indicators in the air environment,

S3. Obtain another part of performance indicators under hydrogen environment by at least including slow strain rate tensile test, fatigue fracture growth rate test, and fracture toughness test for sampling in hydrogen environment.
According to claim 8, the quenching method of the thick-walled station bottle-type container is characterized in that: the section of sampling includes three rings at the middle part along the axial length and 200mm near the circular arc transition section at both ends of the container, And the positions for sampling and analysis include the bottom, side and top of each ring relative to the quenching tank.