Longitudinal telescopic powder collecting and dust blocking device

Abstract

The invention discloses a longitudinal telescopic powder collecting and dust blocking device in the technical field of gypsum board production, and the longitudinal telescopic powder collecting and dust blocking device is characterized in that a discharging port door plate is arranged in a discharging port of a spiral conveyor, and the discharging port door plate can be naturally closed when no downward pulling force effect exists; the feeding port door plate is arranged in the feeding port of the storage hopper, one end of the feeding port and one end of the feeding port door plate are connected with the inner wall of the feeding port through a rotating shaft, and a torsional spring is arranged at the position of the rotating shaft, so that the feeding port door plate can be naturally closed when no downward thrust action exists; the dust cover assembly is arranged between the discharging opening and the feeding opening and used for constructing a closed coal ash conveying channel between the discharging opening and the feeding opening; and the door plate opening and closing assembly is installed in the dust cover assembly, the door plate opening and closing assembly can move downwards so that the feeding port door plate and the discharging port door plate can be opened in sequence, and the door plate opening and closing assembly can move upwards so that the discharging port door plate and the feeding port door plate can be closed in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum board production, and in particular to a longitudinally telescopic powder collecting and dust blocking device. Background Art

[0002] With the progress of the times and the development of society, the requirements for the production environment are becoming more and more stringent. Enterprises not only pay attention to the quality of gypsum boards, but also have increasing requirements for improving the production site compared to before. Therefore, the requirements for leakage in the production process have changed from "yes" to "no".

[0003] Traditional collection devices are all open type, which easily generates dust when the screw conveyor discharges ash. Moreover, ash discharge is a continuous process, which takes a long time and affects the production environment. In addition, the collection device is not blocked during transportation, and the collected coal powder will escape to the outside. Summary of the invention

[0004] The purpose of the present invention is to provide a longitudinally telescopic powder collection and dust blocking device to solve the technical problems that the collection devices in the prior art are all open, easily generate dust when the screw conveyor discharges dust, and the collection devices are not blocked during transportation, the collected coal powder will escape to the outside, affecting the production environment.

[0005] In order to solve the above technical problems, the present invention specifically provides a longitudinal telescopic powder collection and dust blocking device, comprising:

[0006] A discharge port door plate, the discharge port door plate is rotatably arranged in the discharge port of the screw conveyor through a first rotating shaft, the first rotating shaft penetrates the mouth wall of the discharge port, and the end of the first rotating shaft is fixedly connected with a spring plate, the spring plate and the outer wall of the discharge port are respectively fixedly connected to the two ends of the torsion spring, so that the discharge port door plate can be naturally closed when there is no downward pulling force;

[0007] A feed inlet door plate, the feed inlet door plate is rotatably arranged on a bearing frame fixedly arranged in the feed inlet of the storage hopper through a second rotating shaft, and a spring plate is fixedly connected to the end of the second rotating shaft, and the spring plate and the bearing frame are respectively fixedly connected to the two ends of the torsion spring, so that the feed inlet door plate can be naturally closed when there is no downward thrust;

[0008] A dust cover assembly is disposed between the discharge port and the feed port, and is used to construct a closed coal ash conveying channel between the discharge port and the feed port;

[0009] A door panel opening and closing assembly is installed in the dust cover assembly, the door panel opening and closing assembly can move downward so that the feed port door panel and the discharge port door panel are opened successively, and the door panel opening and closing assembly can move upward so that the discharge port door panel and the feed port door panel are closed successively.

[0010] As a preferred embodiment of the present invention, the dust cover assembly includes a hard cover body and a leather flexible cover body fixedly connected to the lower end of the hard cover body, the upper end of the hard cover body is fixedly mounted on the screw conveyor by screws, and the leather flexible cover body is in flexibly contact with the storage hopper.

[0011] The door panel opening and closing assembly includes a telescopic mechanism fixedly mounted on the hard cover body, the movable end of the telescopic mechanism is fixedly connected to a mounting plate and can drive the mounting plate to move up and down, a pressure rod is fixedly arranged at the lower end of the mounting plate, a pull rope is fixedly arranged at the upper end of the mounting plate, and the other end of the pull rope is fixedly connected to the discharge port door panel;

[0012] When the mounting plate moves downward, and the pressure rod moves downward to push the feed port door panel open, the pull rope changes from a relaxed state to a tensioned state and generates a downward pulling force on the discharge port door panel;

[0013] When the mounting plate moves upward and the discharge port door panel is completely closed, the feed port door panel gradually closes.

[0014] As a preferred solution of the present invention, the dust cover assembly includes an upper accordion protective cover and a lower accordion protective cover, the upper cover opening of the upper accordion protective cover is connected to the discharge port by bolts, the lower cover opening of the upper accordion protective cover and the upper cover opening of the lower accordion protective cover are respectively connected to the upper and lower end surfaces of the upper flange, and the lower cover opening of the lower accordion protective cover is sequentially connected to the lower flange and the sealing felt by bolts;

[0015] A guide rod is arranged between the upper flange and the lower flange so that the upper flange and the lower flange can only move up and down relative to each other;

[0016] A telescopic mechanism is installed on the screw conveyor, and the telescopic mechanism is located outside the accordion protective cover, and the movable end of the telescopic mechanism is fixedly connected to the upper flange. The telescopic mechanism can be extended to fit the sealing felt with the feed port, or contracted to keep the sealing felt away from the feed port.

[0017] As a preferred solution of the present invention, the door panel opening and closing assembly includes a mounting plate fixedly connected to the upper flange, a pressure rod is fixedly arranged at the lower end of the mounting plate, a pull rope is fixedly arranged at the upper end of the mounting plate, and the other end of the pull rope is fixedly connected to the discharge port door panel;

[0018] When the sealing felt is in contact with the feed port, the lower accordion protective cover is in an extended state, and the pressure rod completely pushes the feed port door panel open, the pull rope changes from a relaxed state to a tensioned state and generates a downward pulling force on the discharge port door panel;

[0019] When the lower accordion protective cover is fully compressed, the discharge port door panel is fully pulled downward.

[0020] As a preferred solution of the present invention, the air inlet and outlet of the cylinder are connected to a manual air inlet valve and a solenoid valve respectively through a three-way valve and an air pipe, and the manual air inlet valve and the solenoid valve are connected to an air source.

[0021] As a preferred solution of the present invention, the telescopic mechanism is configured as a cylinder or a hydraulic telescopic rod.

[0022] As a preferred solution of the present invention, the discharge port door panel and the feed port door panel are both configured as double-opening and closing door panels to shorten the up and down movement stroke of the door panel opening and closing assembly.

[0023] As a preferred solution of the present invention, a first stopper is fixedly connected to the spring plates at the ends of the first rotating shaft and the second rotating shaft, and a second stopper is fixedly provided on the outer wall of the discharge port and the inner wall of the storage hopper, and when the discharge port door panel and the feed port door panel are closed, the second stopper contacts the first stopper to overcome the rotational force of the torsion spring, so that the discharge port door panel and the feed port door panel remain in a closed state.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The longitudinal telescopic powder collection and dust blocking device constructs a closed coal ash conveying channel between the discharge port and the feed port through the dust cover assembly to prevent subsequent coal powder from leaking from the screw conveyor into the storage hopper. A door panel opening and closing assembly is installed in the dust cover assembly. When it is necessary to convey coal powder to the storage hopper, the door panel opening and closing assembly controls the feed port door panel to open before the discharge port door panel. When it is necessary to transfer the storage hopper, the door panel opening and closing assembly controls the discharge port door panel to close before the feed port door panel, so that the dust in the dust cover assembly completely enters the storage hopper, preventing coal powder from escaping and polluting the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0027] Figure 1 This is a schematic structural diagram of the first embodiment of the dust cover assembly of the present invention when the pull rope is just tightened;

[0028] Figure 2 This is a schematic structural diagram of the first embodiment of the dust cover assembly in the present invention with the discharge port door panel fully opened;

[0029] Figure 3 It is a structural schematic diagram of the second embodiment of the dust cover assembly in the present invention when the pull rope is just tightened;

[0030] Figure 4 This is a schematic structural diagram of the second embodiment of the dust cover assembly in the present invention with the discharge port door panel fully opened;

[0031] Figure 5 It is a schematic diagram of the positional relationship between the mounting plate and the dust cover assembly in the present invention;

[0032] Figure 6 The figure is a schematic diagram of the installation of the discharge port door panel in the present invention, and the figure is a top view;

[0033] Figure 7 This is a schematic diagram of the installation of the feed port door panel in the present invention, and the figure is a bottom-up perspective.

[0034] The numbers in the figure represent the following:

[0035] 1-discharge port door plate, 2-first rotating shaft, 3-screw conveyor, 4-discharge port, 5-spring plate, 6-torsion spring, 7-feed port door plate, 8-second rotating shaft, 9-storage hopper, 10-feed port, 11-bearing frame, 12-hard cover body, 13-leather flexible cover body, 14-cylinder, 15-mounting plate, 16-pressure rod, 17-pull rope, 18-upper accordion protective cover, 19-lower accordion protective cover, 20-upper flange, 21-lower flange, 22-sealing felt, 23-guide rod, 24-first stopper, 25-second stopper. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0037] The present invention specifically provides a longitudinally telescopic powder collection and dust blocking device, comprising:

[0038] Discharge port door 1, such as Figure 6 As shown, the discharge port door panel 1 is rotatably arranged in the discharge port 4 of the screw conveyor 3 through the first rotating shaft 2, the first rotating shaft 2 penetrates the mouth wall of the discharge port 4, and the end of the first rotating shaft 2 is fixedly connected with a spring plate 5, and the spring plate 5 and the outer wall of the discharge port 4 are respectively fixedly connected with the two ends of the torsion spring 6, so that the discharge port door panel 1 can be naturally closed when there is no downward pulling force;

[0039] Feeding port door 7, such as Figure 6 As shown, the feed inlet door plate 7 is rotatably arranged on a bearing frame 11 fixedly arranged in the feed inlet 10 of the storage hopper 9 through a second rotating shaft 8, and a spring plate 5 is fixedly connected to the end of the second rotating shaft 8, and the spring plate 5 and the bearing frame 11 are respectively fixedly connected to the two ends of the torsion spring 6, so that the feed inlet door plate 7 can be naturally closed when there is no downward thrust;

[0040] A dust cover assembly is disposed between the discharge port 4 and the feed port 10, and is used to construct a closed coal ash conveying channel between the discharge port 4 and the feed port 10;

[0041] The door panel opening and closing assembly is installed in the dust cover assembly. The door panel opening and closing assembly can move downward to open the feed port door panel 7 and the discharge port door panel 1 in turn. The door panel opening and closing assembly can move upward to close the discharge port door panel 1 and the feed port door panel 7 in turn.

[0042] The working principle of the longitudinal telescopic powder collection and dust suppression device is as follows:

[0043] After the storage hopper 9 moves to the specified position, the upper and lower ends of the dust cover assembly respectively cover the discharge port 4 of the screw conveyor 3 and the feed port 10 of the storage hopper 9, and a closed coal ash conveying channel is constructed between the discharge port 4 and the feed port 10 to prevent subsequent leakage of coal powder in the process of entering the storage hopper 9 from the screw conveyor 3.

[0044] The door panel opening and closing assembly then moves downward, overcoming the elastic force of the torsion spring 6, opening the feed port door panel 7 and the discharge port door panel 1, allowing the coal powder to be discharged from the discharge port 4 of the screw conveyor 3 and enter the storage hopper 9 through the feed port 10 along the dust cover assembly. When the door panel opening and closing assembly moves downward, the feed port door panel 7 opens first, and the discharge port door panel 1 opens later, so that the coal powder output by the screw conveyor 3 can directly enter the storage hopper 9, preventing the coal powder from accumulating on the upper surface of the feed port door panel 7.

[0045] After the coal powder in the storage hopper 9 reaches the storage upper limit, the door panel opening and closing assembly moves upward, and combined with the reset function of the torsion spring 6, at this time, the discharge port door panel 1 is closed first, and the feed port door panel 7 is closed later, so that the coal powder in the dust cover assembly can completely enter the storage hopper 9, and the coal powder is prevented from accumulating on the upper surface of the feed port door panel 7. If the feed port door panel 7 is closed first, or the discharge port door panel 1 and the feed port door panel 7 are closed at the same time, due to the hysteresis of the coal powder falling, part of the coal powder in the dust cover assembly cannot enter the storage hopper 9, and will be deposited on the upper surface of the feed port door panel 7, and pollute the working environment as the storage hopper 9 is removed. Or after the storage hopper 9 is removed, it will directly escape from the dust cover assembly to the outside air, polluting the working environment.

[0046] In summary, the longitudinal telescopic powder collection and dust blocking device constructs a closed coal ash conveying channel between the discharge port 4 and the feed port 10 through the dust cover assembly, so as to prevent the subsequent coal powder from leaking from the screw conveyor 3 into the storage hopper 9. A door panel opening and closing assembly is installed in the dust cover assembly. When it is necessary to convey coal powder to the storage hopper 9, the door panel opening and closing assembly controls the feed port door panel 7 to open before the discharge port door panel 1. When it is necessary to transfer the storage hopper 9, the door panel opening and closing assembly controls the discharge port door panel 1 to close before the feed port door panel 7, so that the dust in the dust cover assembly completely enters the storage hopper 9, so as to prevent coal powder from escaping and polluting the working environment.

[0047] like Figure 1 and Figure 2 As shown, the first embodiment of the dust cover assembly:

[0048] The dust cover assembly includes a hard cover body 12 and a leather flexible cover body 13 fixedly connected to the lower end of the hard cover body 12. The upper end of the hard cover body 12 is fixedly mounted on the screw conveyor 3 by screws, and the leather flexible cover body 13 is in flexible contact with the storage hopper 9.

[0049] Since the hopper 9 needs to be transferred to a designated area for discharge after the stored coal powder reaches the upper limit, a section of a leather flexible cover 13 is connected to the lower end of the hard cover 12. When the empty hopper 9 comes over, the leather flexible cover 13 conflicts with the hopper 9 and deforms. When the feed port 10 of the hopper 9 is located directly below the discharge port 4, the leather flexible cover 13 just covers the four sides of the feed hopper. Due to the conflict between the leather flexible cover 13 and the hopper 9, the connection interface between the leather flexible cover 13 and the hopper 9 can be sealed to prevent coal powder leakage.

[0050] Implementation method 1 of the door panel opening and closing assembly (based on the above-mentioned implementation method 1 of the dust cover assembly):

[0051] The door panel opening and closing assembly includes a telescopic mechanism fixedly mounted on the hard cover body 12, the movable end of the telescopic mechanism is fixedly connected to the mounting plate 15, and can drive the mounting plate 15 to move up and down, the lower end of the mounting plate 15 is fixedly provided with a pressure rod 16, the upper end of the mounting plate 15 is fixedly provided with a pull rope 17, and the other end of the pull rope 17 is fixedly connected to the discharge port door panel 1; the length of the pressure rod 16 and the length of the pull rope 17 should be set appropriately, and the setting of their lengths needs to meet the following requirements:

[0052] Requirement 1: When the mounting plate 15 moves downward, and the pressure rod 16 moves downward to push open the feed port door panel 7, the pull rope 17 changes from a relaxed state to a tensioned state and generates a downward pulling force on the discharge port door panel 1.

[0053] That is, when the mounting plate 15 moves downward, the lower end of the pressure rod 16 first contacts the upper surface of the feed port door panel 7 , and at this time, the pull rope 17 is in a relaxed state, and no downward pulling force is generated on the discharge port door panel 1 .

[0054] When the pressure rod 16 pushes the feed port door panel 7 completely downward, the pull rope 17 is just in a tensioned state.

[0055] The mounting plate 15 continues to move downward, and the pressing rod 16 also continues to move downward, so that the feed port door panel 7 remains in a fully open state. At this time, the pull rope 17 gradually pulls the discharge port door panel 1 downward.

[0056] Requirement 2: When the mounting plate 15 moves upward and the discharge port door panel 1 is completely closed, the feed port door panel 7 is gradually closed. Requirement 2 is the process of the door panel closing. Meeting requirement 1 naturally meets requirement 2, which will not be elaborated here.

[0057] like Figure 3 and Figure 4 As shown, the second embodiment of the dust cover assembly:

[0058] The dust cover assembly includes an upper accordion protective cover 18 and a lower accordion protective cover 19, wherein the extendable length of the upper accordion protective cover 18 is greater than the extendable length of the lower accordion protective cover 19;

[0059] The upper cover opening of the upper accordion protective cover 18 is connected to the discharge port 4 by bolts, the lower cover opening of the upper accordion protective cover 18 and the upper cover opening of the lower accordion protective cover 19 are respectively connected to the upper and lower end surfaces of the upper flange 20, and the lower cover opening of the lower accordion protective cover 19 is sequentially connected with the lower flange 21 and the sealing felt 22 by bolts; the lower flange 21 mainly plays the role of a counterweight. When the lower flange 21 is suspended in the air, the lower accordion protective cover 19 can be naturally stretched downward, and the sealing felt 22 is mainly used for sealing.

[0060] Since the accordion protective cover is flexible, in order to stabilize the channel constructed by the upper accordion protective cover 18 and the lower accordion protective cover 19 and prevent the lower accordion protective cover 19 from swinging left and right, a guide rod 23 is provided between the upper flange 20 and the lower flange 21; the guide rod 23 can be provided as a bolt, which passes downward through the through hole on the upper flange 20 and is connected with the threaded hole on the lower flange 21, so that the upper flange 20 and the lower flange 21 can only move up and down relatively;

[0061] A telescopic mechanism is installed on the screw conveyor 3, which is located outside the accordion protective cover, and the movable end of the telescopic mechanism is fixedly connected to the upper flange 20. The telescopic mechanism can be extended to fit the sealing felt 22 to the feed port 10, or contracted to keep the sealing felt 22 away from the feed port 10.

[0062] In the above-mentioned second embodiment of the dust cover assembly, during the extension of the telescopic mechanism, the changes of the accordion protective cover can be divided into several stages:

[0063] The first stage: the telescopic mechanism extends to drive the upper flange 20 to move downward, but the sealing felt 22 does not contact the feed port 10. During this process, the upper accordion protective cover 18 is gradually stretched, and due to the gravity, the lower flange 21 also moves downward synchronously. Due to the gravity of the lower flange 21, the lower accordion protective cover 19 is always in a stretched state;

[0064] The second stage: the telescopic mechanism continues to extend to drive the upper flange 20 downward, and the sealing felt 22 has already contacted the feed inlet 10. In this process, the upper accordion protective cover 18 is still gradually stretched. Since the sealing felt 22 has already contacted the feed inlet 10, the lower flange 21 has no space to fall, and the lower accordion protective cover 19 is gradually compressed;

[0065] The third stage: the lower accordion protective cover 19 is completely compressed, and the upper accordion protective cover 18 is stretched to its longest length and fully extended.

[0066] Optionally, a groove for hiding the lower accordion protective cover 19 is provided on the inner side of the upper flange 20 and the lower flange 21. When the lower accordion protective cover 19 is fully compressed, the lower accordion protective cover 19 is completely hidden in the groove, and the relative surfaces on the outer sides of the upper flange 20 and the lower flange 21 conflict with each other.

[0067] Implementation method 2 of the door panel opening and closing assembly (based on the above-mentioned implementation method 2 of the dust cover assembly):

[0068] The door panel opening and closing assembly includes a mounting plate 15 fixedly connected to the upper flange 20, a pressure rod 16 is fixedly arranged at the lower end of the mounting plate 15, a pull rope 17 is fixedly arranged at the upper end of the mounting plate 15, and the other end of the pull rope 17 is fixedly connected to the discharge port door panel 1; the length of the pressure rod 16 and the length of the pull rope 17 should be set appropriately, and the setting of their lengths needs to meet the following requirements:

[0069] Requirement 1: At the end of the first stage, when the lower flange 21 drives the mounting plate 15 to move downward, the sealing felt 22 is just in contact with the feed port 10 and the lower accordion protective cover 19 is in a fully extended state, the pressure rod 16 has just completely pushed open the feed port door panel 7, and the pull rope 17 has just entered a tensioned state from a relaxed state and exerted a downward pulling force on the discharge port door panel 1;

[0070] At the end of the second stage, when the lower accordion shield 19 is completely compressed and the upper accordion shield 18 is stretched to its longest length, the discharge port door panel 1 is completely pulled downward and the feed port door panel 7 remains open.

[0071] Requirement 2: When the mounting plate 15 moves upward with the lower flange 21, and the discharge port door panel 1 is completely closed, the feed port door panel 7 is gradually closed. Requirement 2 is the process of the door panel closing. Meeting requirement 1 naturally meets requirement 2, which will not be elaborated here.

[0072] Compared with the first embodiment of the door panel opening and closing assembly, in the second embodiment of the door panel opening and closing assembly, the door panel opening and closing assembly no longer needs a telescopic mechanism alone, but according to the consistency of the movement of the accordion protective cover and the door panel opening and closing assembly, the entire door panel opening and closing assembly is fixed on the flange of the dust cover assembly and follows the up and down movement of the flange. At this time, the telescopic mechanism is located outside the accordion protective cover to prevent the telescopic mechanism from affecting the flow of coal powder in the accordion protective cover, and also to prevent the coal powder from having an adverse effect on the telescopic mechanism.

[0073] Furthermore, the above-mentioned pull rope 17 can be replaced by a telescopic rod, and the upper end of the telescopic rod is hinged to the discharge port door panel 1.

[0074] When the mounting plate 15 moves downward, and the pressing rod 16 moves downward to push the feed port door panel 7 open, the telescopic rod is stretched to its longest length and generates a downward pulling force on the discharge port door panel 1.

[0075] When the mounting plate 15 moves upwards, and the discharge port door panel 1 is completely closed, the telescopic rod is in the longest state at this moment. After the mounting plate 15 continues to move upwards, the feed port door panel 7 is gradually closed, and the telescopic rod is slowly shortened at this moment.

[0076] Furthermore, the air inlet and outlet of the air cylinder 14 are respectively connected to the manual air inlet valve and the solenoid valve through the three-way valve and the air pipe, and the manual air inlet valve and the solenoid valve are connected to the air source, so as to realize the "manual" operation without contacting the material and reduce the safety risk of personnel.

[0077] Furthermore, the telescopic mechanism is configured as a cylinder 14 or a hydraulic telescopic rod.

[0078] Furthermore, the discharge port door panel 1 and the feed port door panel 7 are both configured as double-opening and closing door panels. Compared with single-opening door panels, the double-opening door panels have a shorter moving path when opening and closing, and require a shorter opening and closing time, which can shorten the up and down movement stroke of the door panel opening and closing components.

[0079] Furthermore, if Figure 6 and Figure 7 As shown, the first stopper 24 is fixedly connected to the spring plate 5 at the end of the first rotating shaft 2 and the second rotating shaft 8, and the second stopper 25 is fixedly arranged on the outer wall of the discharge port 4 and the inner wall of the storage hopper 9. When the discharge port door panel 1 and the feed port door panel 7 are closed, the second stopper 25 abuts against the first stopper 24 to overcome the rotational force of the torsion spring 6, so that the discharge port door panel 1 and the feed port door panel 7 remain in a closed state, and avoid the discharge port door panel 1 and the feed port door panel 7 from rotating excessively upward under the drive of the torsion spring 6 to produce a gap.

[0080] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A longitudinally telescopic powder collection and dust blocking device, characterized in that: include: A discharge port door plate (1), the discharge port door plate (1) is rotatably arranged in a discharge port (4) of a screw conveyor (3) via a first rotating shaft (2), the first rotating shaft (2) passes through the wall of the discharge port (4), and a spring plate (5) is fixedly connected to the end of the first rotating shaft (2), the spring plate (5) and the outer wall of the discharge port (4) are respectively fixedly connected to the two ends of a torsion spring (6), so that the discharge port door plate (1) can be naturally closed when there is no downward pulling force; A feed inlet door plate (7), the feed inlet door plate (7) being rotatably arranged on a bearing frame (11) fixedly arranged in a feed inlet (10) of a storage hopper (9) via a second rotating shaft (8), and a spring plate (5) being fixedly connected to the end of the second rotating shaft (8), the spring plate (5) and the bearing frame (11) being fixedly connected to the two ends of a torsion spring (6) respectively, so that the feed inlet door plate (7) can be closed naturally when there is no downward thrust; A dust cover assembly is arranged between the discharge port (4) and the feed port (10) and is used to construct a closed coal ash conveying channel between the discharge port (4) and the feed port (10); A door panel opening and closing assembly, wherein the door panel opening and closing assembly is installed in the dust cover assembly, the door panel opening and closing assembly can move downward so that the feed port door panel (7) and the discharge port door panel (1) are opened successively, and the door panel opening and closing assembly can move upward so that the discharge port door panel (1) and the feed port door panel (7) are closed successively.

2. A longitudinally telescopic powder collecting and dust blocking device according to claim 1, characterized in that: The dust cover assembly comprises a hard cover body (12) and a leather flexible cover body (13) fixedly connected to the lower end of the hard cover body (12); the upper end of the hard cover body (12) is fixedly mounted on the screw conveyor (3) by screws, and the leather flexible cover body (13) is in flexible contact with the storage hopper (9).

3. A longitudinally telescopic powder collecting and dust blocking device according to claim 2, characterized in that: The door panel opening and closing assembly comprises a telescopic mechanism fixedly mounted on the hard cover body (12); the movable end of the telescopic mechanism is fixedly connected to a mounting plate (15) and is capable of driving the mounting plate (15) to move up and down; a pressure rod (16) is fixedly arranged at the lower end of the mounting plate (15); a pull rope (17) is fixedly arranged at the upper end of the mounting plate (15); the other end of the pull rope (17) is fixedly connected to the discharge port door panel (1); When the mounting plate (15) moves downward, and the pressure rod (16) moves downward to push the feed port door panel (7) open, the pull rope (17) changes from a relaxed state to a tensioned state and generates a downward pulling force on the discharge port door panel (1); When the mounting plate (15) moves upwards and the discharge port door panel (1) is completely closed, the feed port door panel (7) gradually closes.

4. The longitudinally telescopic powder collecting and dust blocking device according to claim 1, characterized in that: The dust cover assembly comprises an upper accordion protective cover (18) and a lower accordion protective cover (19), the upper cover opening of the upper accordion protective cover (18) is connected to the discharge port (4) by bolts, the lower cover opening of the upper accordion protective cover (18) and the upper cover opening of the lower accordion protective cover (19) are respectively connected to the upper and lower end surfaces of the upper flange (20), and the lower cover opening of the lower accordion protective cover (19) is sequentially connected to the lower flange (21) and the sealing felt (22) by bolts; A guide rod (23) is provided between the upper flange (20) and the lower flange (21), so that the upper flange (20) and the lower flange (21) can only move up and down relative to each other; The screw conveyor (3) is equipped with a telescopic mechanism, which is located outside the accordion protective cover, and the movable end of the telescopic mechanism is fixedly connected to the upper flange (20). The telescopic mechanism can be extended to fit the sealing felt (22) with the feed port (10), or contracted to move the sealing felt (22) away from the feed port (10).

5. The longitudinally telescopic powder collecting and dust blocking device according to claim 4, characterized in that: The door panel opening and closing assembly comprises a mounting plate (15) fixedly connected to the upper flange (20), a pressure rod (16) is fixedly arranged at the lower end of the mounting plate (15), a pull rope (17) is fixedly arranged at the upper end of the mounting plate (15), and the other end of the pull rope (17) is fixedly connected to the discharge port door panel (1); When the sealing felt (22) is in contact with the feed port (10), the lower accordion protective cover (19) is in an extended state, and the pressure rod (16) completely pushes open the feed port door panel (7), the pull rope (17) changes from a relaxed state to a tensioned state and generates a downward pulling force on the discharge port door panel (1); When the lower accordion protective cover (19) is fully compressed, the discharge port door panel (1) is fully pulled downward.

6. A longitudinally telescopic powder collecting and dust blocking device according to claim 3 or 5, characterized in that: The telescopic mechanism is configured as a cylinder (14).

7. The longitudinally telescopic powder collecting and dust blocking device according to claim 6, characterized in that: The air inlet and outlet of the cylinder (14) are respectively connected to a manual air inlet valve and a solenoid valve through a three-way valve and an air pipe, and the manual air inlet valve and the solenoid valve are connected to an air source.

8. The longitudinally telescopic powder collecting and dust blocking device according to claim 1, characterized in that: The discharge port door panel (1) and the feed port door panel (7) are both configured as double-opening and closing door panels, so as to shorten the up and down movement stroke of the door panel opening and closing components.

9. The longitudinally telescopic powder collecting and dust blocking device according to claim 1, characterized in that: A first stopper (24) is fixedly connected to the spring plates (5) at the ends of the first rotating shaft (2) and the second rotating shaft (8), and a second stopper (25) is fixedly arranged on the outer wall of the discharge port (4) and the inner wall of the storage hopper (9). When the discharge port door panel (1) and the feed port door panel (7) are closed, the second stopper (25) contacts the first stopper (24) to overcome the rotational force of the torsion spring (6), so that the discharge port door panel (1) and the feed port door panel (7) remain in a closed state.

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