CN114411078A - Vacuum high-temperature automatic pressurizing device and application thereof - Google Patents

Abstract

The invention discloses a vacuum high-temperature automatic pressurizing device and application thereof, and relates to the technical field of heat treatment. The device includes the lid that is used for opening the cavity that vacuum heating's cavity and cavity one side set up, is provided with loading system in the cavity, and loading system includes: the two connecting pieces are vertically and oppositely arranged in the cavity; two pressure plates are sequentially and horizontally arranged between the two connecting pieces from top to bottom, and a plate to be pressed is placed between the two pressure plates; two ends of each pressure plate are respectively connected with the corresponding connecting piece in a sliding manner; and graphite bags are arranged between the top surface and the bottom surface of the cavity and the adjacent pressing plates. The graphite bags are placed on the top surface of the upper pressure plate and the bottom of the lower pressure plate, and under the high-temperature state, the graphite bags expand when meeting high temperature, so that the coating plate placed between the two pressure plates is spontaneously pressed.

Description

A vacuum high temperature automatic pressurizing device and its application

technical field

The invention belongs to the technical field of heat treatment, and in particular relates to a vacuum high temperature automatic pressurizing device and its application.

Background technique

Sheet metal is widely used in marine engineering, construction machinery, aerospace and other fields. With the development of various fields, the demand for sheet metal is increasing. However, metal sheets exposed to atmospheric, marine, and industrial environments are prone to chemical or electrochemical heterogeneous reactions at the interface, causing the metal to enter an oxidized (ionic) state, causing corrosion and seriously affecting the service of engineering facilities. longevity and reliability.

The corrosion-resistant treatment of metal sheets is mainly to treat the metal surface, which can be roughly divided into three categories, namely surface coating technology, surface modification technology and surface coating technology. The most widely used is the surface coating technology, which is widely used in the corrosion-resistant treatment of metal sheets because of its rich metal types, reasonable prices and perfect technology. The commonly used coating treatment technologies at this stage mainly include magnetron sputtering, hot dip plating, etc., which can realize the coating of different metals such as aluminum, magnesium, titanium, and zinc on metal sheets. However, after the metal sheet is treated with coating, due to the uneven distribution of the coating and the incomplete coating during the coating process, it needs to be vacuum annealed or passivated.

The traditional vacuum heat treatment process is to use a vacuum rotary vane pump, a vacuum booster pump, and a vacuum diffusion pump to pump the vacuum degree in the heat treatment furnace to a high vacuum degree above 6.7×10 ^-2 , and then increase the temperature in the furnace by electric heating. To the temperature required by the process, the aluminum processed products are heated and heat treated by radiation in a vacuum environment. After the heat treatment process is completed, the heating and heat preservation are stopped, and the furnace is naturally cooled to the temperature required by the process and then processed in the subsequent process. However, this method will make the inherent quality consistency of the material poor, which restricts the improvement of the production efficiency and product quality of functional aluminum processed products, and the maintenance cost of the equipment is high, the performance is unstable, and the operation process is complicated.

In order to solve the defects of traditional vacuum heat treatment, it is of great significance to provide a device for heat treatment and automatic pressurization of coated plates in a vacuum closed environment, which is of great significance for preparing coatings with excellent corrosion resistance.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned deficiencies in the background technology, the present invention provides a vacuum high temperature automatic pressurizing device and its application, the device can be pressurized at the same time of vacuum heat treatment. In the process of heat treatment of the coated plate by using the device, after applying pressure, the microstructure can be refined, the compactness of the material structure can be improved, and the corrosion resistance of the plate can be improved. Pressure processing can also directly make the plate blank into a part of the required shape and size, which greatly reduces the subsequent processing amount and improves the production efficiency. weight, thereby saving metal materials and improving the utilization rate of materials.

The first object of the present invention is to provide a vacuum high-temperature automatic pressurizing device, which includes a vacuum-heated cavity and a cover provided on one side of the cavity for opening the cavity. Pressing mechanism, the pressurizing mechanism includes:

two connecting pieces, which are vertically oppositely arranged in the cavity;

Two pressing plates are arranged horizontally from top to bottom between the two connecting pieces, and the plates that need to be pressed are placed between the two pressing plates; the two ends of each pressing plate are respectively connected with the corresponding the sliding connection of the connector; and

A graphite package is provided between the top and bottom surfaces of the cavity and the adjacent pressing plates.

Preferably, each of the connecting pieces includes a plate body, and two vertical sides of the connecting piece are provided with strip-shaped sliding grooves for the pressing plate to slide; They are all slidably connected with the corresponding bar-shaped chute.

More preferably, each of the sliding members includes two connecting plates, both of which are vertically opposite to the two sides of the end of the pressing plate, and a sliding block provided at the end of each connecting plate, and each of the sliding blocks. They are respectively slidably connected in the corresponding bar-shaped chute.

More preferably, a sliding fastener is provided between the two connecting plates of each sliding member;

Each of the sliding fasteners includes: a rotating shaft, both of which are rotatably connected between the two connecting plates; the rotating shaft is provided with a hook that is hooked on the plate body, and the rotating shaft is sleeved with a torsion spring One end of the torsion spring is in contact with the end of the pressure plate, and the other end is connected with one side of the hook; the hook is automatically hooked on the plate under the action of the torsion spring;

The plate body is equally spaced from top to bottom with pits for the hooks to be hooked; wherein, the pits in the upper half of the plate body are the first pits, and the pits in the lower half are the first pits. The second dimples, the first dimples and the second dimples are oriented obliquely relative to each other.

More preferably, when the pressing plate on the upper part slides downward, the sliding fasteners connected to both ends of the pressing plate on the upper part are upwardly buckled in the first recesses of different heights;

When the lower pressing plate slides upward, the sliding fasteners connected to the two ends of the lower pressing plate are downwardly buckled in the second recesses of different heights.

More preferably, one end of each of the rotating shafts extends to the other side of the connecting plate and is provided with a toggle button, and the rotation of the toggle button is driven to drive the rotation of the rotating shaft to control the hooks to be hooked on the selector. in the defined pit.

Preferably, all four sides of the cover body are openable and closable on one side of the cavity through fixing clips.

The second object of the present invention is to provide an application of the above-mentioned vacuum high temperature automatic pressing device in heat treatment and automatic pressing of a coated plate.

The third object of the present invention is to provide a method for heat-treating and automatically pressurizing a corrosion-resistant coating plate, using the above-mentioned vacuum high-temperature automatic pressurizing device, comprising the following steps:

Adjusting the distance between the two pressing plates, placing the coating plate between the two pressing plates, and making the top surface and the bottom surface of the coating plate abut against the adjacent pressing plates respectively;

then fix the cover to the cavity by the fixing clip;

Then, the device is placed in a vacuum tube furnace for vacuum heat treatment. Under the condition of high vacuum temperature, the graphite package will expand, and a certain pressure will be applied to the pressing plate, that is, the process of heat treatment and automatic pressurization of the coated plate is completed.

Compared with the prior art, the beneficial effects of the present invention are:

In the vacuum high-temperature automatic pressurizing device provided by the present invention, by placing a graphite package on the top surface of the upper platen and the bottom of the lower platen, under the high temperature state, the graphite package will expand under the action of high temperature, and spontaneously pressurize the two The coated plate placed between the platens performs pressure action, and there is no need to manually control the pressure button to operate; the device can withstand a temperature range of 0 ° C ~ 800 ° C; according to the expansion phenomenon of the expansion material when it encounters high temperature The size of the pressure applied to the plate, compared with the pressure gauge, weigh 1-n grams of expanding materials of different masses, and fill them into the graphite bag for sealing. After the metal plate is placed in the device, the device is sealed, placed in a vacuum high-temperature furnace, and the temperature and time are adjusted. The operation is carried out spontaneously in the process of temperature rise, and then the furnace stops heating and can be taken out after waiting for room temperature; the operation steps of the device are concise, easy to use, low cost, convenient maintenance, etc.; it can improve and improve the resistance of the aluminized coated sheet Corrosion performance; can be applied to coated metal sheets with different substrates such as aluminum, galvanized, and tin.

The vacuum high-temperature automatic pressurizing device provided by the present invention, by arranging sliding fasteners at both ends of the pressing plate, is connected to the upper pressing plate when the upper pressing plate is pushed down under the action of high temperature and under the action of the expansion of the graphite package. The sliding fasteners at both ends are upwardly buckled in the first recesses of different heights to lock the upper pressing plate to prevent the upper pressing plate from retreating upwards. Similarly, when the lower pressing plate is pushed upward under the action of the expansion of the graphite bag, the sliding fasteners connected to the two ends of the lower pressing plate are buckled downward in the second pits of different heights, and the lower pressing plate is locked. Avoid the lower pressing plate from retreating downwards, so as to realize the process of waiting for the temperature in the furnace to drop to room temperature.

Description of drawings

Fig. 1 is a schematic structural diagram of a vacuum high temperature automatic pressurizing device provided by the present invention;

2 is a schematic structural diagram of a connector in the vacuum high temperature automatic pressurizing device provided by the present invention;

3 is a schematic structural diagram of a pressing plate in the vacuum high temperature automatic pressurizing device provided by the present invention;

4 is a schematic structural diagram of a sliding fastener in the vacuum high temperature automatic pressurizing device provided by the present invention;

5 is a schematic structural diagram of a cavity in the vacuum high temperature automatic pressurizing device provided by the present invention;

6 is a schematic structural diagram of a cavity provided with a cover body in the vacuum high temperature automatic pressurizing device provided by the present invention;

FIG. 7 is a schematic structural diagram of a graphite bag in the vacuum high temperature automatic pressurizing device provided by the present invention.

FIG. 8 is a demonstration and mechanism diagram of the pressurization process on the coated sheet provided in Example 3. FIG. Among them, Figure A is a demonstration diagram of unpressurized coated sheet, Figure B is a demonstration diagram of pressurized coated sheet, Figure C is a schematic diagram of coated sheet without pressurization, and Figure D is a diagram of the effect of pressurized coated sheet.

FIG. 9 is a demonstration and mechanism diagram of the pressurization process for the coated sheet provided in Example 5. FIG. Among them, Figure A is a demonstration diagram of unpressurized coated sheet, Figure B is a demonstration diagram of pressurized coated sheet, Figure C is a schematic diagram of coated sheet without pressurization, and Figure D is a diagram of the effect of pressurized coated sheet.

Detailed ways

In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below with reference to specific embodiments, but the embodiments are not intended to limit the present invention.

Example 1

A vacuum high temperature automatic pressurizing device, as shown in Figures 1 to 7, includes a vacuum heating cavity 1 and a cover 8 provided on one side of the cavity 1 for opening the cavity 1,

A pressurizing mechanism is arranged in the cavity 1, and the pressurizing mechanism includes: two connecting pieces, which are vertically oppositely arranged in the cavity 1; two pressing plates 2 arranged horizontally from top to bottom between the two connecting pieces , between the two pressing plates 2 for placing the plate to be pressurized;

For this reason, by placing the graphite package on the top surface of the upper platen and the bottom of the lower platen, under the high temperature state, the graphite package will expand under the action of high temperature, and the coating plate placed between the two platens will be spontaneously applied. Apply pressure. The cover body 8 can be opened and closed on one side of the cavity body 1 through the fixing clips 10 around the cover body 8 . It should be noted that the graphite package is to calculate the amount of expanded graphite in advance, wrap it with aluminum foil cloth, and sew it with fireproof sewing thread. A layer of aluminum foil is added on the outside, and the position of the sewing thread is opposite to that of the sewing thread on the inside, and the double-layer wrapping method is adopted to prevent the graphite bag from expanding and leaking out.

In order to realize the relative movement of the two pressure plates in one direction, each connecting piece includes a plate body 4, and two vertical sides of the connecting piece are provided with bar-shaped chute 43 for sliding the pressure plate 2; both ends of each pressure plate 2 are provided with Sliding pieces, each sliding piece is slidably connected with the corresponding bar-shaped chute 43 .

In order to further realize the sliding connection between the pressure plate and the connecting piece, each sliding piece includes two connecting plates 20, both of which are vertically opposite to the two sides of the end of the pressure plate 2, and the sliding block 21 arranged at the end of each connecting plate 20, each Each of the sliders 21 is slidably connected to the corresponding bar-shaped chute 43 respectively.

In order to realize that a certain height can be continuously locked when the two pressing plates approach relative to one direction, a sliding fastener 6 is provided between the two connecting plates 20 of each sliding member; each sliding fastener 6 includes: a rotating shaft 60, They are all rotatably connected between the two connecting plates 20; the rotating shaft 60 is provided with a hook 61 hooked on the plate body 4, the rotating shaft 60 is sleeved with a torsion spring 62, and one end of the torsion spring 62 is in contact with the end of the pressure plate 2 , the other end is connected to one side of the hook 61; the hook 61 is automatically hooked on the plate body 4 under the action of the torsion spring 62; The pits; wherein, the pits in the upper half of the plate body 4 are the first pits 41, and the pits in the lower half are the second pits 42, and the orientations of the first pits 41 and the second pits 42 are relatively inclined. .

When the upper pressure plate 2 slides downward, the sliding fasteners 6 connected to both ends of the upper pressure plate 2 are upwardly buckled in the first recesses 41 of different heights; when the lower pressure plate 2 slides upward, the connection The sliding fasteners 6 at both ends of the lower pressing plate 2 are buckled downward in the second recesses 42 of different heights.

To this end, by arranging the sliding fasteners 6 at both ends of the pressing plate, under the action of high temperature and under the action of the expansion of the graphite package, when the upper pressing plate is pushed down, the sliding fasteners 6 connected to the two ends of the upper pressing plate will move upward. It is buckled in the first pits of different heights to lock the upper pressure plate to prevent the upper pressure plate from retreating upward. Similarly, when the lower pressing plate is pushed up under the action of the expansion of the graphite bag, the sliding fasteners 6 connected to both ends of the lower pressing plate are buckled downward in the second recesses of different heights to lock the lower pressing plate. , to prevent the lower pressure plate from retreating downward, so as to realize the process of waiting for the temperature in the furnace to drop to room temperature, the pressure plate is locked by the sliding fastener 6 under the action of high temperature, and the retreat to room temperature will not cause the two pressure plates to retreat.

In addition, one end of each rotating shaft 60 extends to the other side of the connecting plate 20 and is provided with a toggle button 7. The rotation of the toggle button 7 drives the rotation of the rotating shaft 60, and the control hook 61 is hooked in the selected recess.

Example 2

A method for heat-treating and automatically pressurizing a corrosion-resistant coated sheet, using the vacuum high-temperature automatic pressurizing device provided in Example 1, comprising the following steps:

The rotation of the rotary shaft 60 is driven by the rotation of the toggle button 7, and when the control hook 61 is temporarily not hooked in the pit, the two pressure plates 2 are moved in the opposite direction for a certain distance, and then the graphite bag is placed in the working area;

Place the coated plate 5 in the stressed area between the two pressing plates 2, then turn the rotary drive shaft 60 of the dial button 7 to control the hooks 61 to be hooked in the selected pits, and make the coated plate 5 The top surface and the bottom surface are respectively abutted with the adjacent pressing plates 2, so that they cannot be moved up and down;

Then fix the cover to the cavity 1 through the fixing clip 9;

Then, the device is placed in a vacuum tube furnace for vacuum heat treatment. Under the condition of high vacuum temperature, the graphite package 3 will expand, and a certain pressure will be applied to the pressure plate 2, that is, the process of heat treatment and automatic pressurization of the coated plate is completed;

Waiting for the temperature in the furnace to drop to room temperature, the pressing plate is locked by the slide button under the action of high temperature, and returning to room temperature will not cause the pressing plate to retreat;

Remove the device from the furnace, wait 5-6 minutes, remove the top cover with a screwdriver, and take out the upper and lower graphite packs with tweezers;

The rotation of the dial button 7 drives the rotation of the rotating shaft 60, and when the control hook 61 is temporarily not hooked into the recess, the two pressing plates are moved to the top and bottom of the connecting piece, and the coated plate is taken out.

Example 3

A preparation method for preparing an aluminum coating by magnetron sputtering of a steel substrate, comprising the following steps:

Experimental material: Base body: 305 steel size 40mm×40mm×2.5mm Target material: Aluminum purity 99.99%

Step 1: The substrate is ultrasonically cleaned with deionized water and alcohol for 5-15 minutes, taken out and then dried. Magnetron sputtering was performed with a PVD500 magnetron sputtering coating system, the gas was argon with a purity of 99.99%, the flow rate was 20sccm, the target-base distance was fixed at 100mm, and the background vacuum was pumped to 2 × 10 ^-3 Pa. Before sputtering , the target was pre-sputtered for 5 min.

Step 2: First, ultrasonically clean the sputtered substrate with clean water and absolute ethanol for 10 minutes. Cut the aluminum-steel coating into 20mm×20mm×2.5mm with a diamond wire cutting machine, use a micro-deformation treatment device to perform micro-deformation treatment on the front and back for 5 minutes, and finally carry out ultrasonic cleaning with anhydrous ethanol on one side, take it out and dry it. use.

Step 3: As shown in Figure 8, the treated aluminum-steel coating is processed by the method provided in Example 2, and the treated aluminum-steel coating is placed in the device provided in Example 1, and the upper and lower pressure plates are adjusted for fixing. , to prevent side-to-side shaking. Put into a vacuum tube furnace, heating temperature 600 ℃, heating time 15min. The device starts to pressurize when it is heated to 300°C, and ends when it is heated to 600°C.

Step 4: When it reaches room temperature, take out the device and take out the aluminum-steel coating for use.

As shown in FIG. 8 , FIG. 8 is a demonstration and mechanism diagram of the pressurization process on the coated sheet provided in Example 3. Among them, Figure A is a demonstration diagram of unpressurized coated sheet, Figure B is a demonstration diagram of pressurized coated sheet, Figure C is a schematic diagram of coated sheet without pressurization, and Figure D is a diagram of the effect of pressurized coated sheet.

It can be seen from Figure 8 that the mechanism changes for the pressure-coated sheet are mainly reflected in three aspects. The first is the change of grains, the second is the change of the streamline structure in the coating, and the third is the thickness of the coating. Before pressing, the grains in the coating are irregular, with different sizes and shapes and other defects, and the interval between grains is large. The streamline organization is chaotic and disordered, mostly arc-shaped, vertical ortho-communication lines, and irregular. The coating thickness is thicker. After pressing, the crystal grains are compacted and refined, and the spacing between the crystal grains becomes smaller, showing the characteristics of overlapping layers, the crystals are more dense and the distribution is more uniform. The streamline structure of the coating after pressing is elongated, and the grains are more compact, and the structure changes are more uniform and compact. The microstructure of the coating occurs, and the corrosion resistance is more excellent.

Example 4

The preparation method of tin film deposited by magnetron sputtering on the surface of AZ31 magnesium alloy comprises the following steps:

Experimental material: Matrix: A231 magnesium alloy size 20mm×20mm×5mm Target material: Si target, Φ60mm×5mm, purity 99.99%.

Step 1: Grind and polish the base magnesium alloy, use acetone and anhydrous ethanol for cleaning, use JSD-300 ultra-vacuum magnetron sputtering coating equipment, and put the base magnesium alloy into the vacuum chamber of this equipment after standing to dry. , the distance between the substrate and the target is 10cm. The background vacuum degree is 3.5×10 ^-4 Pa, the argon gas with the purity of 99.9% is used as the protective gas, the sputtering current is 0.5A, and the coating time is 50min and 1h respectively.

Step 2: The aluminum-magnesium alloy is ultrasonically cleaned with absolute ethanol for 10 minutes, and then cut into a matrix with a size of 10mm×10mm×5mm by a diamond wire cutter. Put the cut substrate into the micro-deformation device for micro-deformation treatment on the front and back sides for 5 minutes each. The processed substrate is ultrasonically cleaned with clean water and absolute ethanol for 10 minutes, and then taken out and dried for use.

Step 3: The coating is processed by the method provided in Example 2, placed in the device provided in Example 1, and the upper and lower pressing plates are adjusted for fixing to prevent left and right shaking. Put into a vacuum tube furnace, heating temperature 600 ℃, heating time 25min. The device starts to pressurize when it is heated to 300°C, and ends when it is heated to 600°C.

Step 4: When it reaches room temperature, take out the device and take out the tin-magnesium coated metal sheet for use.

Example 5

The preparation method of Al-Si hot dip coating on steel plate comprises the following steps:

Experimental material: steel plate size 3×3×1cm ³

Step 1: Put the stirring paddle into the crucible of the resistance furnace, and fill the gap of the crucible with ZL101 aluminum scrap.

Step 2: Pump protective atmosphere argon into the furnace, ventilate for 30 minutes, turn on the power switch, and quickly heat to 800C.

Step 3: After the aluminum alloy is melted, turn on the motor and drive the stirring paddle to rotate at a speed of 200r/min. The holding time of the resistance furnace is 4h. During this period, the protective atmosphere is continuously passed through to prevent the molten aluminum in the crucible from being seriously oxidized, thereby affecting the experimental results.

Step 4: After the heat preservation is over, turn off the power of the motor and the electric furnace, raise the stirring paddle to leave the molten aluminum, but continue to enter the protective atmosphere until the temperature in the furnace drops to room temperature, then close the gas valve and take out the stirring paddle.

Step 5: ultrasonically clean the steel plate with absolute ethanol for 5 minutes, and then cut it into a matrix with a size of 1.5×1.5×1 cm ³ with a diamond wire cutter. Put the cut substrate into the micro-deformation device for micro-deformation treatment on the front and back sides for 5 minutes each. The processed substrate is ultrasonically cleaned with clean water and absolute ethanol for 10 minutes, and then taken out and dried for use.

Step 6: As shown in Figure 9, the coating is processed by the method provided in Example 2, placed in the device provided in Example 1, and the upper and lower partitions are adjusted for fixing to prevent left and right shaking. Put into a vacuum tube furnace, heating temperature 600 ℃, heating time 20min. The pressing plate starts to pressurize when it is heated to 300°C, and ends when it is heated to 600°C.

Step 7: When it reaches room temperature, take out the device and take out the galvanized steel sheet for use.

As shown in FIG. 9 , FIG. 9 is a demonstration and mechanism diagram of the pressurization process for the coated sheet provided in Example 5. Among them, Figure A is a demonstration diagram of unpressurized coated sheet, Figure B is a demonstration diagram of pressurized coated sheet, Figure C is a schematic diagram of coated sheet without pressurization, and Figure D is a diagram of the effect of pressurized coated sheet.

It can be seen from Fig. 9 that the change of the mechanism diagram before and after pressing is reflected in three aspects in Fig. 9, the first is the change of grains, the second is the change of the streamline structure in the coating, and the third is the change of each metal Variation in the thickness of the alloy layer.

Before pressing: Al ₉ Fe ₄ Si ₃ grains are irregular, indeterminate in direction and in different sizes, and the streamline structure in the Al ₂ Fe ₅ coating is mostly arc-shaped and vertical orthogonal streamlines. There are phenomena such as indeterminate direction and irregularity, resulting in uneven and non-dense tissue. The thickness of each metal alloy layer is large, and the interval between layers is large, and the performance of the coating is affected.

After pressurization: Al ₉ Fe ₄ Si ₃ grains are refined and elongated under the action of pressure, the spacing between the grains becomes smaller, and there is a phenomenon of lamination between the grains, resulting in higher strength and hardness of the crystal. The inner streamline structure of the Al ₂ Fe ₅ coating changed from arc-shaped, vertical orthogonal streamline to horizontal streamline, becoming more orderly and regular, forming a good metal streamline structure. The thickness of each metal layer became thinner and the interval became smaller, the most obvious one was the Al _4.5 FeSi layer, which changed from uneven to flat, the metal layer spacing became smaller, and the distribution was more uniform. The microstructure of the Al-Si coated steel becomes denser after pressing, which enhances the corrosion resistance of the coated steel.

The shape of the cavity and the pressing plate designed by the present invention is not a fixed size, and the specific size can be changed according to the material processing requirements under the premise that the processing capacity allows. In theory, when the above requirements are met, the space accommodated by the device and the shape of the metal space can be varied. The pressure obtained by the operation of the device of the invention is accurate, and the mechanical properties of the metal material are good.

The above disclosures are only specific embodiments of the present invention, however, the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides an automatic pressure device of vacuum high temperature, includes vacuum heating's cavity (1) and cavity (1) one side sets up is used for opening lid (8) of cavity (1), its characterized in that, be provided with the loading system in cavity (1), the loading system includes:

the two connecting pieces are vertically and oppositely arranged in the cavity (1);

two pressing plates (2) are sequentially and horizontally arranged between the two connecting pieces from top to bottom, and plates needing to be pressed are placed between the two pressing plates (2); two ends of each pressing plate (2) are respectively connected with the corresponding connecting pieces in a sliding manner; and

and a graphite bag (3) is arranged between the top surface and the bottom surface of the cavity (1) and the adjacent pressing plate (2).

2. The vacuum high-temperature automatic pressurizing device according to claim 1, wherein each connecting piece comprises a plate body (4), and strip-shaped sliding grooves (43) for the pressing plates (2) to slide are formed in two vertical sides of the plate body; and sliding parts are arranged at two ends of each pressing plate (2), and each sliding part is connected with the corresponding strip-shaped sliding groove (43) in a sliding manner.

3. The vacuum high-temperature automatic pressurizing device according to claim 2, wherein each sliding member comprises two connecting plates (20) which are vertically and oppositely arranged at two sides of the end part of the pressure plate (2), and a sliding block (21) arranged at the end part of each connecting plate (20), and each sliding block (21) is respectively and slidably connected in the corresponding strip-shaped sliding groove (43).

4. The vacuum high temperature automatic pressurizing apparatus according to claim 3,

a sliding fastener (6) is arranged between the two connecting plates (20) of each sliding part;

each of the slide fasteners (6) includes: the rotating shafts (60) are rotatably connected between the two connecting plates (20); a hook piece (61) hooked on the plate body (4) is arranged on the rotating shaft (60), a torsion spring (62) is sleeved on the rotating shaft (60), one end of the torsion spring (62) is abutted against the end part of the pressing plate (2), and the other end of the torsion spring is connected with one side of the hook piece (61); the hook piece (61) is automatically hooked on the plate body (4) under the action of the torsion spring (62);

pits for the hook members (61) to hook are formed in the plate body (4) at equal intervals from top to bottom; the concave pit of the upper half part of the plate body (4) is a first concave pit (41), the concave pit of the lower half part is a second concave pit (42), and the orientation of the first concave pit (41) and the orientation of the second concave pit (42) are relatively inclined.

5. The vacuum high temperature automatic pressurizing apparatus according to claim 4,

when the pressing plate (2) positioned at the upper part slides downwards, the sliding fasteners (6) connected to the two ends of the pressing plate (2) at the upper part are upwards fastened in first pits (41) with different heights;

when the pressing plate (2) at the lower part slides upwards, the sliding fasteners (6) connected with the two ends of the pressing plate (2) at the lower part are downwards fastened in second pits (42) with different heights.

6. The vacuum high-temperature automatic pressurizing device according to claim 5, wherein one end of each rotating shaft (60) extends to the other side of the connecting plate (20) and is provided with a toggle button (7), and the rotating shaft (60) is driven to rotate by toggling the toggle button (7), so that the hook member (61) is controlled to be hooked in a selected pit.

7. The vacuum high-temperature automatic pressurizing device according to claim 1, wherein the periphery of the cover body (8) is arranged on one side of the cavity (1) in an openable and closable manner through a fixing clamp (10).

8. Use of the vacuum high-temperature automatic pressurizing device as defined in any one of claims 1 to 7 in heat treatment and automatic pressurizing of coated plates.

9. A method for carrying out heat treatment and automatic pressurization on a corrosion-resistant coating plate is characterized in that the vacuum high-temperature automatic pressurization device as claimed in any one of claims 1 to 7 is adopted, and the method comprises the following steps:

adjusting the distance between the two pressure plates (2), placing a coating plate (5) between the two pressure plates (2), and enabling the top surface and the bottom surface of the coating plate (5) to be respectively abutted against the adjacent pressure plates (2);

then the cover body is fixed on the cavity (1) through a fixing clamp (9);

and then the device is placed in a vacuum tube furnace for vacuum heat treatment, the graphite bag (3) expands under the condition of vacuum high temperature, and a certain pressure is applied to the pressing plate (2), so that the process of heat treatment and automatic pressurization of the coated plate is completed.

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