A longitudinal telescopic powder collection dust prevention device

Abstract

The application discloses a longitudinal telescopic powder collecting dust prevention device in the technical field of gypsum board production, a discharge port door plate, the discharge port door plate is arranged in a discharge port of a spiral conveyor, and the discharge port door plate can be naturally closed without downward pulling force; a feeding port door plate, the feeding port door plate is arranged in a feeding port of a storage hopper, one end of the feeding port door plate is connected with an inner wall of the feeding port through a rotating shaft, and a torsional spring is arranged at the rotating shaft, so that the feeding port door plate can be naturally closed without downward pushing force; a dust cover assembly is arranged between the discharge port and the feeding port and is used for constructing a closed coal ash conveying channel between the discharge port and the feeding port; and a door plate opening and closing assembly is installed in the dust cover assembly, the door plate opening and closing assembly can be moved downward to open the feeding port door plate and the discharge port door plate in sequence, and the door plate opening and closing assembly can be moved upward to close the discharge port door plate and the feeding port door plate 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 dust. Moreover, dust 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 prevention device to solve the technical problems in the prior art that the collection devices are all open, easily generate dust when the screw conveyor discharges dust, and the collection device is not blocked during transportation, and 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 longitudinally telescopic powder collection and dust suppression device, comprising:

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

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

[0008] A dust cover assembly is provided 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] The door opening and closing assembly is installed in the dust cover assembly, and can be moved downward to open the discharge port door and the feeding port door in sequence, and can be moved upward to close the discharge port door and the feeding port door in sequence.

[0010] As a preferred scheme of the present application, the dust cover assembly comprises a hard cover body and a cortex flexible cover body fixedly connected to the lower end of the hard cover body, the upper end of the hard cover body is fixedly installed on the screw conveyor by screws, and the cortex flexible cover body is in flexible contact with the storage hopper.

[0011] The door opening and closing assembly comprises a telescopic mechanism fixedly installed on the hard cover body, the movable end of the telescopic mechanism is fixedly connected with a mounting plate, the mounting plate can be driven to move up and down, the lower end of the mounting plate is fixedly provided with a pressing rod, and the upper end of the mounting plate is fixedly provided with a pull rope, the other end of the pull rope is fixedly connected with the discharge port door.

[0012] When the mounting plate moves downward, the pull rope enters a tension state from a relaxed state and generates a downward pulling force on the discharge port door after the pressing rod pushes the feeding port door away;

[0013] When the mounting plate moves upward, the feeding port door is gradually closed after the discharge port door is completely closed.

[0014] As a preferred scheme of the present application, the dust cover assembly comprises an upper piano protective cover and a lower piano protective cover, the upper end cover of the upper piano protective cover is connected with the discharge port by bolts, the lower end cover of the upper piano protective cover and the upper end cover of the lower piano protective cover are respectively connected with the upper and lower end faces of an upper flange plate, and the lower end cover of the lower piano protective cover is sequentially connected with a lower flange plate and sealing felt by bolts.

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

[0016] A telescopic mechanism is installed on the screw conveyor, the telescopic mechanism is located outside the piano protective cover, the movable end of the telescopic mechanism is fixedly connected with the upper flange plate, the telescopic mechanism can be elongated to make the sealing felt adhere to the feeding port, or can be contracted to make the sealing felt away from the feeding port.

[0017] As a preferred scheme of the present application, the door plate opening and closing assembly comprises a mounting plate fixedly connected with the upper flange plate, a pressing rod fixedly arranged at the lower end of the mounting plate, and a pull rope fixedly arranged at the upper end of the mounting plate, with the other end of the pull rope fixedly connected with the discharge port door plate.

[0018] When the sealing felt is attached to the feeding port, the lower organ bell-shaped protective cover is in the elongated state, and the pressing rod completely pushes away the feeding port door plate, the pull rope enters the tension state from the relaxed state and generates the downward pulling force on the discharge port door plate.

[0019] When the lower organ bell-shaped protective cover is completely compressed, the discharge port door plate is completely pulled open downward.

[0020] As a preferred scheme of the present application, the air inlet and outlet of the air cylinder are connected with a manual air inlet valve and a solenoid valve through a tee valve and an air pipe, respectively, and the manual air inlet valve and the solenoid valve are connected with an air source.

[0021] As a preferred scheme of the present application, the telescopic mechanism is provided as an air cylinder or a hydraulic telescopic rod.

[0022] As a preferred scheme of the present application, the discharge port door plate and the feeding port door plate are both provided as double opening and closing door plates, so as to shorten the up and down moving stroke of the door plate opening and closing assembly.

[0023] As a preferred scheme of the present application, first stop blocks are fixedly connected on the spring plates at the ends of the first rotating shaft and the second rotating shaft, respectively, and second stop blocks are fixedly arranged on the outer wall of the discharge port and the inner wall of the storage hopper, so that when the discharge port door plate and the feeding port door plate are closed, the second stop blocks abut against the first stop blocks to overcome the rotating force of the torsional spring, so as to keep the discharge port door plate and the feeding port door plate in the closed state.

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

[0025] The longitudinal telescopic powder collecting dust prevention device constructs a closed coal ash conveying channel between the discharge port and the feeding port through the dust cover assembly, avoids the leakage during the process that the subsequent coal powder enters the storage hopper from the screw conveyor, and installs the door plate opening and closing assembly in the dust cover assembly. When it is needed to convey the coal powder to the storage hopper, the door plate opening and closing assembly controls the feeding port door plate to be opened first, and when it is needed to transfer the storage hopper, the door plate opening and closing assembly controls the discharge port door plate to be closed first, so that the dust cover assembly is completely entered into the storage hopper, and the coal powder is prevented from escaping and polluting the working environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the field, other drawings can be obtained from the provided drawings without creative labor.

[0027] Figure 1 Structure schematic diagram of the first embodiment of the dust cover assembly in the present application and the structure when the pull rope is just tensioned;

[0028] Figure 2 Structure schematic diagram of the first embodiment of the dust cover assembly in the present application and the structure when the pull rope is just tensioned;

[0029] Figure 3 Structure schematic diagram of the second embodiment of the dust cover assembly in the present application and the structure when the pull rope is just tensioned;

[0030] Figure 4 Structure schematic diagram of the second embodiment of the dust cover assembly in the present application and the structure when the pull rope is just tensioned;

[0031] Figure 5 Position relationship schematic diagram of the mounting plate and the dust cover assembly in the present application;

[0032] Figure 6 Mounting schematic diagram of the discharge port door plate in the present application, which is a top view;

[0033] Figure 7 Mounting schematic diagram of the discharge port door plate in the present application, which is a top view;

[0034] The numbers in the drawings respectively represent the following:

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

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0037] The present invention specifically provides a longitudinally telescopic powder collection and dust suppression 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 passes through the wall of the discharge port 4, and the end of the first rotating shaft 2 is fixedly connected to a spring plate 5. The spring plate 5 and the outer wall of the discharge port 4 are respectively fixedly connected to 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 port door panel 7 is rotatably arranged on a bearing frame 11 fixedly arranged in the feed port 10 of the storage hopper 9 via a second rotating shaft 8, and the end of the second rotating shaft 8 is fixedly connected to a spring plate 5, 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 port door panel 7 can be naturally closed when there is no downward thrust;

[0040] The dust cover assembly is provided 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 succession. 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 succession.

[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 designated 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, constructing a closed coal ash conveying channel between the discharge port 4 and the feed port 10 to prevent subsequent coal powder from leaking during the process of entering the storage hopper 9 from the screw conveyor 3.

[0044] Then the door panel opening and closing assembly moves downward, overcoming the elastic force of the torsion spring 6 and opening the feed inlet door panel 7 and the discharge port door panel 1, so that the coal powder is discharged from the discharge port 4 of the screw conveyor 3 and enters 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 inlet door panel 7 opens first and the discharge port door panel 1 opens later, so that the coal powder discharged 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 inlet door panel 7.

[0045] After the pulverized coal in the hopper 9 reaches its upper storage limit, the door panel opening and closing assembly moves upward. Combined with the reset action of the torsion spring 6, the discharge port door panel 1 closes first, followed by the feed port door panel 7, allowing the pulverized coal in the dust cover assembly to completely enter the hopper 9, preventing the pulverized coal from accumulating on the upper surface of the feed port door panel 7. If the feed port door panel 7 closes first, or if the discharge port door panel 1 and feed port door panel 7 close simultaneously, due to the hysteresis of the pulverized coal falling, some of the pulverized coal in the dust cover assembly will not be able to enter the hopper 9 and will be deposited on the upper surface of the feed port door panel 7. As the hopper 9 is removed, it will pollute the working environment. Alternatively, after the hopper 9 is removed, the pulverized coal will directly escape from the dust cover assembly into the outside air, polluting the working environment.

[0046] In summary, the longitudinally 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, thereby preventing subsequent leakage of coal dust 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 dust 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 can completely enter the storage hopper 9, preventing coal dust 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 collides 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, and 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, and the upper end of the mounting plate 15 is fixedly provided with a pull rope 17. 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 must 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 enters the tensioned state from the relaxed 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 . At this time, the pull rope 17 is in a relaxed state and does not generate downward pulling force 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 pressure 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 end cover opening of the upper accordion protective cover 18 is connected to the discharge port 4 by bolts, the lower end cover opening of the upper accordion protective cover 18 and the upper end cover opening of the lower accordion protective cover 19 are respectively connected to the upper and lower end faces of the upper flange 20, and the lower end cover opening of the lower accordion protective cover 19 is sequentially connected to 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 organ shield is flexible, in order to stabilize the channel formed by the upper organ shield 18 and the lower organ shield 19 and prevent the lower organ shield 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 configured as a bolt, which passes downward through the through hole on the upper flange 20 and is connected to 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 relative to each other.

[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 extend to fit the sealing felt 22 to the feed port 10, or contract to keep the sealing felt 22 away from the feed port 10.

[0062] In the 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] Phase 1: The telescopic mechanism extends to drive the upper flange 20 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 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] Phase 2: The telescopic mechanism continues to extend, driving the upper flange 20 downward, until the sealing felt 22 contacts the feed inlet 10. During this process, the upper accordion shield 18 continues to be gradually stretched. Since the sealing felt 22 contacts the feed inlet 10, there is no room for the lower flange 21 to descend, and the lower accordion shield 19 is gradually compressed.

[0065] Phase 3: 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 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 fixedly provided at the lower end of the mounting plate 15, and a pull rope 17 fixedly provided at the upper end of the mounting plate 15, the other end of the pull rope 17 being 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, that is, 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. At this time, the pressure rod 16 has just completely pushed the feed port door panel 7 open, 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, that is, when the lower accordion protective cover 19 is fully compressed and the upper accordion protective cover 18 is stretched to its longest length, the discharge port door panel 1 is fully 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 door panel closing. Meeting requirement 1 naturally meets requirement 2, which will not be elaborated here.

[0072] Compared to the first embodiment of the door panel opening and closing assembly, the second embodiment no longer requires a separate telescopic mechanism. Instead, the entire door panel opening and closing assembly is fixed to the flange of the dust cover assembly to align the movement of the accordion shield with the door panel opening and closing assembly, and moves up and down with the flange. The telescopic mechanism is now located outside the accordion shield, preventing it from interfering with the flow of coal dust within the accordion shield and preventing the coal dust from adversely affecting the telescopic mechanism.

[0073] Furthermore, the above-mentioned pull rope 17 can be replaced by a telescopic rod, the upper end of which 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 open the feed port door panel 7 , 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 at its longest state. 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.

[0076] Furthermore, the air inlet and outlet of the cylinder 14 are connected to the manual air inlet valve and the 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 the air source, thereby realizing "manual" operation without contacting the material and reducing personnel safety risks.

[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 the required opening and closing time is shorter, 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, a 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 a second stopper 25 is fixedly provided 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, 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 merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection 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 scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A longitudinally telescopic powder collection and dust suppression device, characterized in that: include: A discharge port door panel (1), the discharge port door panel (1) is rotatably arranged in the discharge port (4) of the screw conveyor (3) via a first rotating shaft (2), the first rotating shaft (2) passes through the wall of the discharge port (4), and the end of the first rotating shaft (2) is fixedly connected to a spring plate (5), 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 panel (1) can be naturally closed when there is no downward pulling force; A feed port door panel (7), the feed port door panel (7) is rotatably arranged on a bearing frame (11) fixedly arranged in the feed port (10) of the storage hopper (9) via a second rotating shaft (8), and the end of the second rotating shaft (8) is fixedly connected to a spring plate (5), 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 port door panel (7) can be naturally closed when there is no downward thrust; A dust cover assembly is provided 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, the door panel opening and closing assembly being installed in the dust cover assembly, the door panel opening and closing assembly being capable of moving downwards to enable the feed port door panel (7) and the discharge port door panel (1) to be opened successively, and the door panel opening and closing assembly being capable of moving upwards to enable the discharge port door panel (1) and the feed port door panel (7) to be closed successively; 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); 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 a mounting plate (15) and is capable of driving the mounting plate (15) to move up and down, a pressure rod (16) is fixedly provided at the lower end of the mounting plate (15), a pull rope (17) is fixedly provided 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 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 upward and the discharge port door panel (1) is completely closed, the feed port door panel (7) gradually closes.

2. A longitudinally telescopic powder collecting and dust blocking device according to claim 1, characterized in that: The dust cover assembly includes an upper accordion protective cover (18) and a lower accordion protective cover (19), the upper end cover opening of the upper accordion protective cover (18) is connected to the discharge port (4) by bolts, the lower end cover opening of the upper accordion protective cover (18) and the upper end 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 end 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).

3. The longitudinally telescopic powder collecting and dust-blocking device according to claim 2, characterized in that: 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 provided at the lower end of the mounting plate (15), a pull rope (17) is fixedly provided 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 the feed port door panel (7) open, the pull rope (17) enters a tensioned state from a relaxed 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.

4. A longitudinally telescopic powder collecting and dust blocking device according to claim 1 or 2, characterized in that: The telescopic mechanism is configured as a cylinder (14).

5. The longitudinally telescopic powder collecting and dust blocking device according to claim 4, 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.

6. 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.

7. 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 provided 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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