A lower guard plate structure of an ultra-high temperature heat exchanger and a working method thereof

Abstract

The present invention relates to the field of guard plates for the metallurgical industry, and in particular to a lower guard plate structure of an ultra-high temperature heat exchanger and a working method thereof. The lower guard plate of the ultra-high temperature heat exchanger comprises: two fixed frames, symmetrically arranged on a sealing plate, and a first gap is left at the sealing plate between the two fixed frames; two lifting doors, respectively used to block the passages below the corresponding fixed frames, and a second gap is left between the two lifting doors; a folding door, rotatably arranged on the corresponding fixed frames through a rebound component, and used to block the first gap; a swinging small door, rotatably arranged on the corresponding lifting door, respectively, keeps the second gap closed by its own weight, and rotates to open the second gap when the lifting door is lifted; a lifting mechanism, suitable for driving the lifting door to lift and lower; when the lower guard plate is in an open state, it can accommodate a spraying trolley with a vertically arranged spraying rod to pass through for spraying operations.

Description

Technical Field

[0001] The invention relates to the field of guard plates for metallurgical industry, and in particular to a lower guard plate structure of an ultra-high temperature heat exchanger and a working method thereof. Background Art

[0002] The ultra-high temperature heat exchanger is used for heat exchange between molten salt and ultra-high temperature (about 1500℃) liquid steel slag. The low temperature molten salt is heated by the steel slag in the heat exchange system composed of the ultra-high temperature heat exchanger and the molten salt buffer tank, and then transported to the high temperature molten salt tank for storage using a molten salt pump; at the same time, the steel slag is cooled to about 900℃, changing from liquid to a block structure with a solidified outer surface. That is, the inlet of the ultra-high temperature heat exchanger is liquid steel slag, and the outlet is a block structure with a solidified outer surface. The block slag needs to be transported to the next process by a slag truck.

[0003] Generally, the lower guard plate of the material discharge port can only prevent the slag liquid from splashing out, and its function is single. In particular, after the ultra-high temperature heat exchanger is discharged, it is necessary to use a spraying trolley to spray a release agent into the ultra-high temperature heat exchanger to prevent the subsequent liquid slag from adhering to the inner wall of the heat exchanger. At the same time, spraying the release agent also facilitates the demolding of the slag block. The spraying trolley has a spraying rod extending vertically upward, and the existing overall structure of the lower guard plate cannot enable this type of spraying trolley to pass through. Summary of the invention

[0004] The object of the present invention is to provide a lower guard plate structure of an ultra-high temperature heat exchanger and a working method thereof.

[0005] In order to solve the above technical problems, the present invention provides a lower guard plate of an ultra-high temperature heat exchanger, comprising: two fixed frames, symmetrically arranged on a sealing plate, and a first gap is left at the sealing plate between the two fixed frames; two lifting doors, respectively used to block the channels under the corresponding fixed frames, and a second gap is left between the two lifting doors; a folding door, rotatably arranged on the corresponding fixed frames through a rebound component, for blocking the first gap; a swinging small door, rotatably arranged on the corresponding lifting door, respectively, keeping the second gap closed by its own weight, and rotating to open the second gap when the lifting door is lifted; a lifting mechanism, suitable for driving the lifting door to lift; wherein when the lifting mechanism drives the lifting door to rise, the channel on the lower side of the fixed frame is exposed, and the swinging small door is driven to open the second gap, and the folding door is suitable for rotating around the rebound component to open the first gap when subjected to thrust.

[0006] Furthermore, one-way locking assemblies are respectively arranged on the fixing frame toward the corresponding folding door; when the lifting door is in an open state, the one-way locking assembly is disengaged from the corresponding folding door so that the folding door can be opened and closed freely to both sides; when the lifting door is in a closed state, the one-way locking assembly is abutted against the corresponding folding door so that the folding door can only be opened and closed to one side of the sealing plate.

[0007] Furthermore, the one-way locking assembly includes: a locking block, a fixed end of which is hinged on a corresponding fixing frame, and a movable end is a pressing portion on a side facing the lifting door, and a door-blocking portion on a side facing the folding door; a spring, one end of which is connected to the fixing frame, and the other end is fixed to the locking block on a side close to the folding door; wherein when the lifting door is in a closed state, the side edge of the lifting door presses against the pressing portion of the locking block, so that the door-blocking portion of the locking block overcomes the elastic force of the spring and extends into the first gap, so that the folding door can only be opened and closed toward one side of the sealing plate; and when the lifting door is in an open state, the side edge of the lifting door is disengaged from the pressing portion of the locking block, and the spring rebounds to drive the door-blocking portion of the locking block to leave the first gap, so as to allow the folding door to open and close freely to both sides.

[0008] Furthermore, guide grooves for accommodating the side edges of the lifting door are provided on the inner walls of the two side frames of the fixed frame; the lifting mechanism includes: a rotating shaft, which is arranged above the fixed frame; a plurality of winding wheels, which are arranged on the rotating shaft at intervals; steel wire ropes corresponding to the winding wheels one by one, whose upper ends are fixed on the winding wheels and whose lower ends are fixed at the upper edge of the lifting door; and a driver, which is suitable for driving the rotating shaft to rotate forward or reverse, so that the steel wire rope is wound or unwound around the winding wheel, so as to drive the lifting door to rise and fall along the guide groove.

[0009] Furthermore, the upper part of the swinging small door is hinged on the corresponding lifting door, and the upper edge of the swinging small door in the second gap abuts against the lower edge of the corresponding side frame body of the fixed frame; wherein when the lifting door rises, the swinging small door swings toward the outside of the second gap around the hinge point under the push of the corresponding side frame body to open the second gap; and when the lifting door descends, the swinging small door falls freely to block the second gap.

[0010] Furthermore, the rebound component includes a plurality of spring hinges.

[0011] Furthermore, the lower guard plate of the ultra-high temperature heat exchanger also includes: two side plates, which are respectively arranged on both sides of the sealing plate and are perpendicular to the sealing plate; the bottom of each side plate is inclined inward and is funnel-shaped; wherein the shape of the lifting door is suitable for matching with the side wall of the inclined portion of the corresponding side plate when it descends to a closed state.

[0012] Furthermore, a baffle is provided on the fixing frame at the outer side of the corresponding lifting door.

[0013] On the other hand, the present invention also provides a working method for the lower guard plate of an ultra-high temperature heat exchanger, comprising: the lifting mechanism drives the lifting door to rise, exposing the channel on the lower side of the fixed frame, and drives the swinging small door to open the second gap, and the folding door is suitable for rotating around the rebound component when subjected to thrust to open the first gap; the lifting mechanism drives the lifting door to descend, blocking the channel on the lower side of the fixed frame, the swinging small door droops by its own weight to block the second gap, and the folding door is suitable for blocking the first gap.

[0014] Furthermore, the working method of the lower guard plate of the ultra-high temperature heat exchanger adopts the working method of the lower guard plate of the ultra-high temperature heat exchanger as described above.

[0015] The beneficial effect of the present invention is that when the lifting mechanism of the lower guard plate structure of the ultra-high temperature heat exchanger of the present invention drives the lifting door to rise to an open state, the lower channel of the fixed frame is suitable for accommodating the passage of the slag truck, and the folding door opens a first gap when subjected to a thrust, which is suitable for the passage of the vertically arranged spray rod of the spray trolley for spraying operations; when the lifting door is in a closed state, the folding door blocks the first gap, and the swinging small door closes the second gap to prevent slag from splashing out.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is the front view of the UHT heat exchanger with the lower guard plate closed;

[0020] Figure 2 yes Figure 1 An enlarged vertical cross-section of the one-way locking assembly at position A in FIG.

[0021] Figure 3 It is a three-dimensional diagram of the state where the lower guard plate of the ultra-high temperature heat exchanger is closed;

[0022] Figure 4 yes Figure 3 The enlarged view of point B in the figure;

[0023] Figure 5 This is the front view of the UHT heat exchanger with the lower guard plate open;

[0024] Figure 6 yes Figure 5 An enlarged vertical cross-section of the one-way locking assembly at position C in FIG.

[0025] Figure 7 This is a three-dimensional diagram of the ultra-high temperature heat exchanger with the lower guard plate opened;

[0026] Figure 8 yes Figure 7 Enlarged view of point D in .

[0027] In the figure:

[0028] Sealing plate 1, fixing frame 2, first gap 21, guide groove 22, lifting door 3, second gap 31, folding door 4, swinging small door 5, lifting mechanism 6, rotating shaft 61, winding wheel 62, wire rope 63, driver 64, rebound assembly 7, one-way locking assembly 8, locking block 81, spring 82, side plate 9, baffle 10. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1 and Figure 5As shown, this embodiment provides a lower guard plate structure of an ultra-high temperature heat exchanger, comprising: two fixed frames 2, symmetrically arranged on a sealing plate 1, and a first gap 21 is left at the sealing plate 1 between the two fixed frames 2; two lifting doors 3, respectively used to block the channels below the corresponding fixed frames 2, and a second gap 31 is left between the two lifting doors 3; a folding door 4, rotatably arranged on the corresponding fixed frame 2 through a rebound component 7, used to block the first gap 21; a swinging small door 5, rotatably arranged on the corresponding lifting door 3, keeping the second gap 31 closed by its own weight, and rotating to open the second gap 31 when the lifting door 3 is lifted; a lifting mechanism 6, suitable for driving the lifting door 3 to lift; wherein the lifting mechanism 6 drives the lifting door 3 to rise, exposing the channel on the lower side of the fixed frame 2, and driving the swinging small door 5 to open the second gap 31, and the folding door 4 is suitable for rotating around the rebound component 7 to open the first gap 21 when subjected to a thrust.

[0032] In this embodiment, when the lifting mechanism 6 drives the lifting door 3 to rise to the open state, the lower channel of the fixed frame 2 is suitable for accommodating the passage of the slag transport vehicle, and the folding door 4 opens the first gap 21 when subjected to a thrust, which is suitable for accommodating the passage of a spraying trolley with a vertically arranged spraying rod to complete the spraying operation; when the lifting door 3 is in the closed state, the folding door 4 blocks the first gap 21, and the swinging small door 5 closes the second gap 31 to prevent the slag from splashing out.

[0033] In this embodiment, when the slag liquid is discharged from the ultra-high temperature heat exchanger, the lifting mechanism 6 drives the lifting door 3 to rise, and opens the lower channel of the fixed frame 2, so that the slag liquid can be transported out by the slag transport vehicle. Due to the particularity of the slag liquid, a release agent needs to be sprayed on the discharge port before the next discharge to prevent the slag liquid from adhering to the side wall of the discharge port. Therefore, after the previous slag liquid discharge is completed and before the next slag liquid discharge, a spraying trolley needs to spray the inner wall of the discharge port.

[0034] In this embodiment, when the spraying trolley passes through the channel below the fixed frame 2 and enters below the discharge port, the spraying rod extending vertically upward on the spraying trolley pushes the folding door 4 to one side of the discharge port and enters the discharge port. After completing the spraying operation, the spraying trolley leaves the discharge port through the channel below the fixed frame 2. At this time, the spraying rod pushes the folding door 4 to the outside of the discharge port and leaves the discharge port.

[0035] In some application scenarios, such as when the lifting door 3 is in a closed state, the slag liquid will impact the side wall when it is discharged from the discharge port, and may push the hinged door 4 open, causing the slag liquid to splash out.

[0036] In this embodiment, preferably, Figure 2 , Figure 4 , Figure 6 and Figure 8As shown, one-way locking components 8 are respectively arranged on the fixing frame 2 toward the corresponding folding door 4; when the lifting door 3 is in an open state, the one-way locking component 8 is disengaged from the corresponding folding door 4 so that the folding door 4 can be freely opened and closed to both sides; when the lifting door 3 is in a closed state, the one-way locking component 8 is abutted against the corresponding folding door 4 so that the folding door 4 can only be opened and closed to one side of the sealing plate 1.

[0037] In this embodiment, as a preferred implementation of the one-way locking component 8, the one-way locking component 8 includes: a locking block 81, a fixed end of which is hinged on the corresponding fixing frame 2, and a movable end facing the side of the lifting door 3 is a pressing part, and the side facing the folding door 4 is a door-blocking part; a spring 82, one end of which is connected to the fixing frame 2, and the other end is fixed to the locking block 81 on the side close to the folding door 4; wherein when the lifting door 3 is in a closed state, the side edge of the lifting door 3 presses against the pressing part of the locking block 81, so that the door-blocking part of the locking block 81 overcomes the elastic force of the spring 82 and extends into the first gap 21, so that the folding door 4 can only open and close to one side of the sealing plate 1; and when the lifting door 3 is in an open state, the side edge of the lifting door 3 is out of contact with the pressing part of the locking block 81, and the spring 82 rebounds to drive the door-blocking part of the locking block 81 to leave the first gap 21, so as to allow the folding door 4 to open and close freely to both sides.

[0038] In this embodiment, when the lifting door 3 is in a closed state, the side wall of the lifting door 3 is tightly attached to the abutting part of the locking block 81, so that the spring 82 is stretched, and the door-blocking part of the locking block 81 is pushed out of the fixed frame 2 around the fixed hinged end to abut against the corresponding folding door 4, and a screw is also provided on the side of the door-blocking part facing the folding door 4, so that the screw presses the outer side of the folding door 4 to prevent the slag liquid from impacting the folding door 4 from the inside to open the first gap 21 when the slag liquid is discharged; when the lifting door 3 is driven upward to the open state by the lifting mechanism 6, the lifting door 3 is disengaged from the corresponding abutting part, the spring 82 rebounds, and pulls the door-blocking part of the locking block 81 back to the fixed frame 2, and the screw of its door-blocking part is also disengaged from the corresponding folding door 4. At this time, the folding door 4 can be opened and closed freely to both sides and then automatically closed, so as to realize the function of unlocking when the lifting door 3 is opened and automatically locking in one direction when the lifting door 3 is lowered.

[0039] In this embodiment, guide grooves 22 for accommodating the side edges of the lifting door 3 are provided on the inner walls of the two side frames of the fixed frame 2; the lifting mechanism 6 includes: a rotating shaft 61, which is arranged above the fixed frame 2; a plurality of winding wheels 62, which are arranged at intervals on the rotating shaft 61; a steel wire rope 63 corresponding to the winding wheels 62 one by one, whose upper ends are fixed on the winding wheels 62, and whose lower ends are fixed at the upper edge of the lifting door 3; and a driver 64, which is suitable for driving the rotating shaft 61 to rotate forward or reverse, so that the steel wire rope 63 is wound or unwound around the winding wheels 62, so as to drive the lifting door 3 to rise and fall along the guide groove 22.

[0040] In this embodiment, the driver can be a reduction motor; the lifting mechanism 6 is installed above the fixed frame 2, and a corresponding position of the fixed frame 2 is provided with an avoidance hole for accommodating the wire rope 63 to pass through. When the driver 64 drives the rotating shaft 61 to rotate forward, the winding wheel 62 reels the wire rope 63, and the lifting door 3 is lifted; when the driver 64 drives the rotating shaft 61 to rotate reversely, the winding wheel 62 unwinds the wire rope 63, and the lifting door 3 descends; the guide grooves 22 on both sides of the fixed frame 2 are suitable for limiting the lifting and lowering of the lifting door 3 along the corresponding moving trajectory.

[0041] In this embodiment, the upper part of the swinging small door 5 is hinged on the corresponding lifting door 3, and the upper edge of the swinging small door 5 located in the second gap 31 is abutted against the lower edge of the corresponding side frame body of the fixed frame 2; wherein when the lifting door 3 rises, the swinging small door 5 swings toward the outside of the second gap 31 around the hinge point under the push of the corresponding side frame body to open the second gap 31; and when the lifting door 3 descends, the swinging small door 5 falls freely to block the second gap 31.

[0042] In this embodiment, when the lifting door 3 is driven by the lifting mechanism 6 to rise, the swinging small door 5 between the two lifting doors 3 for blocking the second gap 31 rises accordingly. At the moment when the upper edge of the swinging small door 5 collides with the lower edge of the corresponding fixing frame 2, due to the torque balance, the swinging small door 5 rotates and swings toward the lifting door 3 along the hinge to open the second gap 31 and is completely hidden in the corresponding lifting door 3; when the lifting door 3 is driven by the lifting mechanism 6 to descend, the swinging small door 5 rotates and swings along the hinge under the action of its own weight, and finally stops at the middle position to close the second gap 31. The swinging small door 5 is suitable for opening the second gap 31 when the lifting door 3 is opened, and automatically closing the second gap when the lifting door 3 is closed.

[0043] In this embodiment, the rebound component 7 includes a plurality of spring hinges.

[0044] In this embodiment, each spring hinge is symmetrically arranged on the corresponding folding door 4 and the fixed frame 2, so that the folding door 4 can be opened and closed to both sides around the corresponding spring hinge, and after the two opposite folding doors 4 are opened and closed under the action of thrust, they are finally in a closed state to block the first gap 21.

[0045] like Figure 3 and Figure 7As shown, in this embodiment, the lower guard plate of the ultra-high temperature heat exchanger further includes: two side plates 9, which are respectively arranged on both sides of the sealing plate 1 and are perpendicular to the sealing plate 1; the bottom of each of the side plates 9 is inclined inwardly and is funnel-shaped; wherein the shape of the lifting door 3 is suitable for matching with the side wall of the inclined portion of the corresponding side plate 9 when it is lowered to the closed state.

[0046] In this embodiment, the shape of the lifting door 3 is suitable for matching with the inclined portion at the bottom of the corresponding side panel 9 to prevent the slag liquid from splashing out from the gap between the lifting door 3 and the side panel 9 during the unloading process; the bottom of the side panel 9 is funnel-shaped to facilitate the slag liquid to gather and fall into the slag transport vehicle.

[0047] In this embodiment, a baffle 10 is provided on the fixing frame 2 at the outer side of the corresponding lifting door 3 .

[0048] In this embodiment, the baffle 10 can be used to protect the lifting door 3 to prevent the lifting door 3 from turning outward during the lifting process, and can also strengthen the strength of the corresponding fixing frame 2 and improve the stability of the fixing frame 2.

[0049] Example 2

[0050] On the basis of the above embodiments, the present embodiment further provides a working method for the lower guard plate of an ultra-high temperature heat exchanger, including: the lifting mechanism 6 drives the lifting door 3 to rise, exposing the channel on the lower side of the fixed frame 2, and drives the swinging small door 5 to open the second gap 31, and the folding door 4 is suitable for rotating around the rebound component 7 when subjected to thrust to open the first gap 21; the lifting mechanism 6 drives the lifting door 3 to descend, blocking the channel on the lower side of the fixed frame 2, and the swinging small door 5 droops by its own weight to block the second gap 31, and the folding door 4 is suitable for blocking the first gap 21.

[0051] In this embodiment, the working method of the lower guard plate of the ultra-high temperature heat exchanger adopts the working method of the lower guard plate of the ultra-high temperature heat exchanger as described above.

[0052] In some application scenarios, when the slag of the ultra-high temperature heat exchanger is unloaded, the slag transport vehicle is located directly below the unloading port, and the lower guard plate structure is in a closed state. At this time, the lifting door 3, the folding door 4 and the swinging small door 5 are all in a closed state, and the folding door 4 cannot be opened to the outside due to the limiting effect of the one-way locking assembly 8; when the slag is unloaded, the lifting door 3 rises to expose the channel under the fixed frame 2, and the swinging small door 5 rotates to open the second gap 31 on both sides for the slag transport vehicle to transport the slag out; after the slag transport vehicle is transported out, the lifting door 3 and the swinging small door 5 continue to be kept open, and the spraying trolley moves to directly below the unloading port. During this period, the spraying rod squeezes the folding door 4 to push it open. After the spraying trolley enters, the folding door 4 automatically closes. After the spraying operation is completed, the spraying trolley returns to the original route; the slag transport vehicle that has completed unloading re-enters below the unloading port, and at this time, the lower guard plate structure is restored to a closed state.

[0053] In summary, when the lifting mechanism 6 drives the lifting door 3 to rise to the open state, the lower channel of the fixed frame 2 is suitable for accommodating the passage of the slag transport vehicle, and the folding door 4 opens the first gap 21 when subjected to thrust, which is suitable for accommodating the passage of the spraying vehicle with a vertically arranged spraying rod to complete the spraying operation; when the lifting door 3 is in the closed state, the folding door 4 blocks the first gap 21, and the swinging small door 5 closes the second gap 31 to prevent the slag from splashing out. The one-way locking assembly 8 can realize the function of unlocking when the lifting door 3 is opened and automatically locking in one direction when the lifting door 3 is lowered. The guide grooves 22 on both sides of the fixed frame 2 are suitable for limiting the lifting door 3 to rise and fall along the corresponding moving trajectory. The swinging small door 5 is suitable for opening the second gap 31 when the lifting door 3 is opened, and automatically closing the second gap when the lifting door 3 is closed. Each spring hinge can make the two relative folding doors 4 open and close under the action of thrust, and finally block the first gap 21 in a closed state. The shape of the lifting door 3 is suitable for matching with the inclined portion of the bottom of the corresponding side plate 9 to prevent the slag liquid from splashing outward from the gap between the lifting door 3 and the side plate 9 during the unloading process; the bottom of the side plate 9 is funnel-shaped, which facilitates the slag liquid to gather and fall into the slag transport vehicle. The baffle 10 can be used to protect the lifting door 3 on the one hand and prevent the lifting door 3 from turning outward during the lifting process, and on the other hand, it can also strengthen the strength of the corresponding fixing frame 2 and improve the stability of the fixing frame 2.

[0054] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A lower guard plate structure for an ultra-high temperature heat exchanger, It is characterized in that include: Two fixing frames (2) are symmetrically arranged on a sealing plate (1), and a first gap (21) is left at the sealing plate (1) between the two fixing frames (2); Two lifting doors (3), respectively used to block the passage below the corresponding fixing frame (2), and a second gap (31) is left between the two lifting doors (3); A hinged door (4) is rotatably arranged on a corresponding fixed frame (2) via a rebound assembly (7) and is used to block the first gap (21); The swinging small doors (5) are rotatably mounted on the corresponding lifting doors (3), keep the second gap (31) closed by their own weight, and rotate to open the second gap (31) when the lifting door (3) is lifted; The lifting mechanism (6) is suitable for driving the lifting door (3) to move up and down; When the lifting mechanism (6) drives the lifting door (3) to rise, the passage on the lower side of the fixed frame (2) is exposed, and the swinging small door (5) is driven to open the second gap (31); and the folding door (4) is suitable for rotating around the rebound component (7) when subjected to a thrust to open the first gap (21).

2. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 1, It is characterized in that The fixing frame (2) is provided with a one-way locking assembly (8) facing the corresponding hinged door (4); wherein When the lifting door (3) is in an open state, the one-way locking assembly (8) is disengaged from the corresponding hinged door (4), so that the hinged door (4) can be opened and closed freely to both sides; When the lifting door (3) is in a closed state, the one-way locking assembly (8) abuts against the corresponding hinged door (4) so ​​that the hinged door (4) can only open and close toward one side of the sealing plate (1).

3. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 2, It is characterized in that The one-way locking assembly (8) comprises: A locking block (81), the fixed end of which is hinged on a corresponding fixing frame (2), and the side of the movable end facing the lifting door (3) is a locking portion, and the side facing the hinged door (4) is a door blocking portion; A spring (82) has one end connected to the fixing frame (2) and the other end fixed to a locking block (81) on a side close to the hinged door (4); wherein When the lifting door (3) is in a closed state, the side edge of the lifting door (3) abuts against the abutting portion of the locking block (81), so that the door-blocking portion of the locking block (81) overcomes the elastic force of the spring (82) and extends into the first gap (21), so that the hinged door (4) can only open and close toward one side of the sealing plate (1); and When the lifting door (3) is in an open state, the side edge of the lifting door (3) is out of contact with the abutting portion of the locking block (81), and the spring (82) rebounds to drive the door-blocking portion of the locking block (81) to leave the first gap (21), thereby allowing the folding door (4) to open and close freely to both sides.

4. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 2, It is characterized in that The inner walls of the two side frames of the fixed frame (2) are provided with guide grooves (22) for accommodating the side edges of the lifting door (3); The lifting mechanism (6) comprises: A rotating shaft (61) is arranged above the fixing frame (2); A plurality of winding wheels (62) are arranged at intervals on the rotating shaft (61); A steel wire rope (63) corresponding to the winding wheel (62) in a one-to-one manner, with its upper end fixed to the winding wheel (62) and its lower end fixed to the upper edge of the lifting door (3); and The driver (64) is suitable for driving the rotating shaft (61) to rotate forward or reverse, so that the steel wire rope (63) is wound or unwound around the winding wheel (62), so as to drive the lifting door (3) to rise and fall along the guide groove (22).

5. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 1, It is characterized in that The upper part of the swinging small door (5) is hinged on the corresponding lifting door (3), and the upper edge of the swinging small door (5) located in the second gap (31) abuts against the lower edge of the corresponding side frame body of the fixed frame (2); wherein When the lifting door (3) rises, the swinging small door (5) swings toward the outside of the second gap (31) around the hinge point under the push of the corresponding side frame body to open the second gap (31); and When the lifting door (3) descends, the swinging small door (5) falls freely to block the second gap (31).

6. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 1, It is characterized in that The rebound component (7) comprises a plurality of spring hinges.

7. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 1, It is characterized in that Also includes: Two side plates (9) are respectively arranged on both sides of the sealing plate (1) and are perpendicular to the sealing plate (1); The bottom of each side plate (9) is inclined inwards and is funnel-shaped; The outer shape of the lifting door (3) is suitable for matching with the side wall of the inclined portion of the corresponding side plate (9) when the lifting door (3) is lowered to a closed state.

8. The lower guard plate structure of the ultra-high temperature heat exchanger according to claim 1, It is characterized in that A baffle (10) is provided on the fixing frame (2) and located outside the corresponding lifting door (3).

9. A method for operating the lower guard plate of the ultra-high temperature heat exchanger according to any one of claims 1 to 8, It is characterized in that include: The lifting mechanism (6) drives the lifting door (3) to rise, exposing the passage below the fixed frame (2), and drives the swinging door (5) to open the second gap (31); and the hinged door (4) is adapted to rotate around the rebound assembly (7) to open the first gap (21) when receiving a thrust. The lifting mechanism (6) drives the lifting door (3) to descend, thereby blocking the passage below the fixed frame (2); the swinging door (5) droops by its own weight to block the second gap (31); and the folding door (4) is suitable for blocking the first gap (21).

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