Emergency cut-off device for pulverized coal conveying

Abstract

The utility model discloses an emergency cut-off device for pulverized coal conveying, which relates to the technical field of pulverized coal conveying and comprises a pneumatic disconnecting link and a plugging component, the pneumatic disconnecting link is composed of a valve body, a cylinder and a flashboard, and the plugging component comprises a linkage plugging unit, a self-locking unit and a limiting unit. The linkage plugging unit is used for plugging a containing groove in the bottom of the valve body main body; the self-locking unit is used for achieving self-locking operation of the linkage plugging unit after upward movement. The limiting unit is used for limiting the upward moving height of the linkage plugging unit. Through the arrangement of the plugging assembly, when the gate plate moves upwards, the arc-shaped plugging block plugs the containing groove in the bottom of the valve body, pulverized coal can smoothly pass through the channel of the valve body, and the situation that the pulverized coal falls into the containing groove in the bottom of the valve body is avoided; when the flashboard moves downwards to be close to the arc-shaped plugging block, the arc-shaped plugging block can be extruded to move downwards synchronously, the flashboard is inserted into the containing groove in the bottom of the valve body, and plugging of the channel of the valve body is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal powder delivery, and particularly relates to a coal powder delivery emergency cut-off device. BACKGROUND

[0002] At present, industrial coal powder boilers have been widely applied, and coal powder combustion and coal powder delivery technology is the core and key technology of the technology. However, unstable states are prone to occur in the delivery process of coal powder, and unstable coal powder combustion. If the coal powder delivery is not stopped urgently, the combustion stability and safe operation of the subsequent combustion system will be seriously affected, and safety accidents such as flammability and flameout of the combustion system will also occur, which will also lead to unstable combustion of the combustion system and poor coal powder combustion rate.

[0003] Therefore, a cut-off valve is installed on the coal powder delivery pipeline for emergency cut-off operation. The pneumatic knife gate is one of the commonly used cut-off valves for the coal powder delivery pipeline. The pneumatic knife gate valve is a valve controlled by a pneumatic actuator to realize the opening and closing of the valve. The valve can be divided into two parts, the upper half is the pneumatic actuator, and the lower half is the valve. In use, the pneumatic actuator can realize the up-and-down operation of the valve, thereby realizing the switching of the on and off states of the coal powder delivery pipeline.

[0004] In use, the valve body of the knife gate valve has a containing groove at the bottom for accommodating the lower edge of the gate plate. When the gate plate is in the open state, a small amount of coal powder will enter the containing groove when the coal powder passes through the valve body. These coal powders will hinder the lower edge of the gate plate from fitting with the containing groove when the gate plate is closed, thereby reducing the tightness of the knife gate valve. Based on this, a coal powder delivery emergency cut-off device is provided. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problems in the above background, and provides a coal powder delivery emergency cut-off device.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a coal powder delivery emergency cut-off device, which comprises a pneumatic knife gate composed of a valve body, a pneumatic cylinder and a gate plate. The pneumatic cylinder is fixedly installed above the valve body through a support. The gate plate is fixed to the bottom of the output shaft of the pneumatic cylinder and extends through the inside of the valve body. The gate plate is driven up and down by the pneumatic cylinder to realize the switching of the on and off states of the passage of the valve body. The inside of the valve body is provided with a plugging assembly. The plugging assembly is used to plug the containing groove at the bottom of the valve body after the gate plate is moved upward.

[0007] The plugging assembly comprises a linkage plugging unit, a self-locking unit and a limiting unit.

[0008] The linkage plugging unit is synchronously moved upward by the upward force of the gate plate to realize the plugging of the containing groove at the bottom of the valve body.

[0009] The self-locking unit is used for realizing self-locking operation of the linkage plugging unit after being moved up;

[0010] The limiting unit is used for limiting the moving height of the linkage plugging unit.

[0011] As a further scheme of the utility model: the linkage plugging unit comprises an arc-shaped plugging block and a 7-shaped linkage rod;

[0012] The two sides of the gate plate are provided with recessed grooves, the arc-shaped plugging block is distributed on the inner side of the valve body main body and located in the bottom accommodating groove of the valve body main body, the 7-shaped linkage rod is symmetrically fixed to the top of the arc-shaped plugging block, the vertical parts of the two 7-shaped linkage rods are respectively attached to the inner wall side of the valve body main body and the bottom side of the gate plate, and the horizontal part of the 7-shaped linkage rod is slidably connected to the inner side of the recessed groove.

[0013] When the gate plate is moved up, the horizontal part of the 7-shaped linkage rod is pulled up through the bottom of the recessed groove, so that the arc-shaped plugging block is moved up and the bottom accommodating groove of the valve body main body is plugged.

[0014] When the gate plate is moved down, the horizontal part of the 7-shaped linkage rod is pressed down through the top of the recessed groove, so that the arc-shaped plugging block is moved down, thereby ensuring that the bottom of the gate plate is inserted into the bottom accommodating groove of the valve body main body.

[0015] As a further scheme of the utility model: the self-locking unit comprises an L-shaped telescopic groove, an L-shaped lock block and a spring;

[0016] The L-shaped telescopic groove is arranged in the horizontal part of the 7-shaped linkage rod and penetrates the top and one side of the horizontal part, and the L-shaped lock block is slidably connected to the inner side of the L-shaped telescopic groove and protrudes from the top and one side of the horizontal part of the 7-shaped linkage rod.

[0017] The spring is distributed in the inner side of the L-shaped telescopic groove and respectively attached to the inner wall side of the L-shaped telescopic groove and the vertical part side of the L-shaped lock block, so as to provide horizontal thrust for the L-shaped lock block, when the horizontal part of the 7-shaped linkage rod is moved up above the valve body main body, the horizontal part of the L-shaped lock block protrudes to the outer side of the 7-shaped linkage rod and is attached to the upper surface of the valve body main body, so as to realize the downward limiting of the arc-shaped plugging block and the 7-shaped linkage rod.

[0018] As a further scheme of the utility model: an inclined pressing groove is arranged on the top of the inner wall of the recessed groove, when the gate plate is moved down to contact the top of the vertical part of the L-shaped lock block, the L-shaped lock block is pressed to shrink horizontally into the L-shaped telescopic groove, so as to realize the unlocking of the self-locking.

[0019] As a further scheme of the utility model: the limiting unit comprises a limiting block;

[0020] The two limiting blocks are symmetrically fixed to the top of the two sides of the arc-shaped blocking block, and a limiting sliding groove is arranged at the position where the inner wall of the valve body and the limiting block are in contact, which is used for limiting the upward height of the limiting block.

[0021] As a further scheme of the utility model: the arc-shaped blocking block is composed of an arc-shaped block and two inclined edges, the two inclined edges are symmetrically fixed to the top end of the arc-shaped block, the inner wall diameter of the arc-shaped block matches the inner ring diameter of the bottom accommodating groove of the valve body, and the outer diameter of the arc-shaped block is smaller than the outer ring diameter of the bottom accommodating groove of the valve body.

[0022] The bottom track of the gate plate matches the inner track of the arc-shaped blocking block.

[0023] Compared with the prior art, the utility model has the advantages that:

[0024] By arranging the blocking assembly, in the state that the gate plate moves upward, the arc-shaped blocking block blocks the bottom accommodating groove of the valve body, the pulverized coal can smoothly pass through the passage of the valve body, and the pulverized coal cannot fall into the bottom accommodating groove of the valve body, when the gate plate moves downward and approaches the arc-shaped blocking block, the arc-shaped blocking block can be extruded to move downward synchronously, the gate plate is inserted into the bottom accommodating groove of the valve body, and the passage of the valve body is blocked. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the utility model;

[0026] Figure 2 It is a structural sectional view of the valve body of the utility model;

[0027] Figure 3 It is a structural sectional view of the valve body, the gate plate, the arc-shaped blocking block and the 7-shaped linkage rod of the utility model;

[0028] Figure 4 It is a structural sectional view of the utility model in the state that the gate plate moves downward;

[0029] Figure 5 It is a structural schematic view of the gate plate, the arc-shaped blocking block and the 7-shaped linkage rod of the utility model.

[0030] In the drawing: 1, pneumatic knife gate; 101, valve body; 102, air cylinder; 103, gate plate; 104, concave groove; 105, inclined pressing groove; 106, limiting sliding groove; 2, blocking assembly; 201, arc-shaped blocking block; 2011, arc-shaped block; 2012, inclined edge; 202, 7-shaped linkage rod; 203, L-shaped telescopic groove; 204, L-shaped locking block; 205, spring; 206, limiting block. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0032] Please refer to Figures 1-5 In the embodiments of the utility model, a coal powder conveying emergency cut-off device comprises a pneumatic knife gate 1 composed of a valve body 101, a cylinder 102 and a gate plate 103, the cylinder 102 is fixedly installed above the valve body 101 through a support, the gate plate 103 is fixed to the bottom of the output shaft of the cylinder 102 and extends through to the inside of the valve body 101, the gate plate 103 is driven up and down by the cylinder 102 to realize the switching of the open and cut-off states of the passage of the valve body 101, the inside of the valve body 101 is provided with a plugging assembly 2, the plugging assembly 2 is used for plugging the accommodating groove at the bottom of the valve body 101 after the gate plate 103 is moved up;

[0033] The plugging assembly 2 comprises a linkage plugging unit, a self-locking unit and a limiting unit;

[0034] The linkage plugging unit is synchronously moved up by the upward moving force of the gate plate 103 to realize the plugging of the accommodating groove at the bottom of the valve body 101;

[0035] The self-locking unit is used for realizing the self-locking operation of the linkage plugging unit after being moved up;

[0036] The limiting unit is used for limiting the upward moving height of the linkage plugging unit;

[0037] The linkage plugging unit comprises an arc-shaped plugging block 201 and a 7-shaped linkage rod 202;

[0038] The gate plate 103 is provided with a concave groove 104 on both sides, the arc-shaped plugging block 201 is distributed inside the valve body 101 and located inside the accommodating groove at the bottom of the valve body 101, the 7-shaped linkage rod 202 is fixedly arranged at the top of the arc-shaped plugging block 201, the vertical parts of the two 7-shaped linkage rods 202 are respectively attached to the inner wall side of the valve body 101 and the bottom side of the gate plate 103, and the horizontal part of the 7-shaped linkage rod 202 is slidingly connected to the inside of the concave groove 104;

[0039] When the gate plate 103 is moved up, the horizontal part of the 7-shaped linkage rod 202 is pulled up through the bottom of the concave groove 104, so that the arc-shaped plugging block 201 is moved up and the inside of the accommodating groove at the bottom of the valve body 101 is plugged;

[0040] When the gate plate 103 moves downward, the transverse part of the 7-shaped linkage rod 202 is pressed downward by the top of the concave groove 104, so as to realize the downward movement of the arc-shaped blocking block 201, thereby ensuring that the bottom of the gate plate 103 is inserted into the accommodating groove at the bottom of the valve body 101;

[0041] The self-locking unit comprises an L-shaped telescopic groove 203, an L-shaped locking block 204 and a spring 205.

[0042] The L-shaped telescopic groove 203 is arranged in the transverse part of the 7-shaped linkage rod 202 and penetrates the top and one side of the transverse part, and the L-shaped locking block 204 is slidingly connected to the inner side of the L-shaped telescopic groove 203 and protrudes from the top and one side of the transverse part of the 7-shaped linkage rod 202.

[0043] The spring 205 is arranged on the inner side of the L-shaped telescopic groove 203 and respectively adheres to the inner wall side of the L-shaped telescopic groove 203 and the vertical side of the L-shaped locking block 204, so as to provide horizontal thrust for the L-shaped locking block 204. When the transverse part of the 7-shaped linkage rod 202 moves upward above the valve body 101, the horizontal part of the L-shaped locking block 204 protrudes outward of the 7-shaped linkage rod 202 and adheres to the upper surface of the valve body 101, so as to realize the downward movement limiting of the arc-shaped blocking block 201 and the 7-shaped linkage rod 202.

[0044] The inner wall top of the concave groove 104 is provided with an inclined pressing groove 105. When the gate plate 103 moves downward to contact the top of the vertical part of the L-shaped locking block 204, the L-shaped locking block 204 is pressed to shrink horizontally into the L-shaped telescopic groove 203, so as to realize the unlocking of the self-locking.

[0045] In this embodiment, when the pneumatic knife gate 1 is used in the coal powder conveying pipeline, it is in the on state in the daily state (as shown in Figure 1 ), at this time, the inner side of the arc-shaped blocking block 201 is flush with the bottom of the passage of the valve body 101 (as shown in Figure 2 ), that is, the bottom accommodating groove of the valve body 101 is blocked, and the coal powder can pass through the passage of the valve body 101 smoothly, and the coal powder will not fall into the bottom accommodating groove of the valve body 101;

[0046] When an emergency occurs and the pipeline needs to be cut off, the external controller controls the starting of the air cylinder 102, the air cylinder 102 pushes the gate plate 103 to move downward, in the process of moving downward of the gate plate 103, the 7-shaped linkage rod 202 remains stationary under the locking action of the L-shaped lock block 204, that is, the arc-shaped blocking block 201 remains in the state of blocking the bottom accommodating groove of the valve body main body 101, when the gate plate 103 moves downward to the lower surface and is about to contact the arc-shaped blocking block 201, the inclined pressure groove 105 contacts the vertical side surface of the L-shaped lock block 204 (it should be noted that the position where the inclined pressure groove 105 contacts the vertical side surface of the L-shaped lock block 204 is in an arc surface structure), the L-shaped lock block 204 is subjected to an inclined extrusion force from the inclined pressure groove 105, the inclined extrusion force can make the L-shaped lock block 204 move horizontally to shrink into the L-shaped telescopic groove 203, and extrude and shrink the spring 205, so that the locking of the L-shaped lock block 204 and the valve body main body 101 is released, at this time, the lower surface of the gate plate 103 is attached to the inner surface of the arc-shaped blocking block 201;

[0047] Then, the gate plate 103 continues to move downward and extrude the arc-shaped blocking block 201, the 7-shaped linkage rod 202 moves downward as a whole, the bottom of the gate plate 103 is inserted into the bottom accommodating groove inside the valve body main body 101, at this time, the blocking of the passage of the valve body main body 101 is completed.

[0048] Please refer to Figures 2-5 , the limiting unit includes a limiting block 206;

[0049] The limiting block 206 is provided with two, and the two limiting blocks 206 are symmetrically fixed to the top of the two sides of the arc-shaped blocking block 201. The inner wall of the valve body main body 101 is provided with a limiting sliding groove 106 at the contact position of the limiting block 206, and the limiting sliding groove 106 is used for limiting the upward height of the limiting block 206.

[0050] In this embodiment, in the process of moving the arc-shaped blocking block 201 up and down, the limiting block 206 moves up and down along the inner wall of the limiting sliding groove 106, and the limiting sliding groove 106 is used for limiting the up and down movement distance of the limiting block 206. This structure is mainly used for positioning the highest position of the arc-shaped blocking block 201, so as to avoid that the arc-shaped blocking block 201 moves too high and partially blocks the passage of the valve body main body 101.

[0051] Please refer to Figures 2-5 , the arc-shaped blocking block 201 is composed of an arc-shaped block 2011 and an inclined edge 2012, the two inclined edges 2012 are symmetrically fixed to the top end of the arc-shaped block 2011, the inner wall diameter of the arc-shaped block 2011 matches the inner ring diameter of the bottom accommodating groove of the valve body main body 101, and the outer diameter of the arc-shaped block 2011 is smaller than the outer ring diameter of the bottom accommodating groove of the valve body main body 101.

[0052] The bottom trajectory of the gate plate 103 matches the inner side trajectory of the arc-shaped blocking block 201.

[0053] In the embodiment, the arc-shaped block 2011 is used to block the bottom accommodating groove of the valve body 101, and the arc-shaped block 2011 can move downward in the bottom accommodating groove of the valve body 101 to ensure that the gate plate 103 is inserted into the bottom accommodating groove of the valve body 101.

[0054] The inclined edge 2012 is used to make the size of the bottom part of the gate plate 103 greater than the aperture of the passage of the valve body 101, so as to ensure that the gate plate 103 completely cuts off the passage.

[0055] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A coal powder conveying emergency cut-off device, comprising a pneumatic knife gate (1) composed of a valve body (101), a pneumatic cylinder (102) and a gate plate (103), the pneumatic cylinder (102) is fixedly installed above the valve body (101) through a support, the gate plate (103) is fixed to the bottom of the output shaft of the pneumatic cylinder (102) and extends through to the inside of the valve body (101), the gate plate (103) is driven up and down by the pneumatic cylinder (102) to realize the switching of the open and closed states of the passage of the valve body (101), characterized in that, The inside of the valve body (101) is provided with a blocking assembly (2), which is used for blocking the containing groove at the bottom of the valve body (101) after the gate (103) is moved upward; The blocking assembly (2) comprises a linkage blocking unit, a self-locking unit and a limiting unit; The linkage blocking unit is synchronously moved upward by the upward force of the gate (103), so as to block the containing groove at the bottom of the valve body (101); The self-locking unit is used for self-locking the linkage blocking unit after being moved upward; The limiting unit is used for limiting the upward height of the linkage blocking unit.

2. The coal powder delivery emergency cut-off device according to claim 1, wherein The linkage blocking unit comprises an arc-shaped blocking block (201) and a 7-shaped linkage rod (202); The gate (103) is provided with a concave groove (104) on both sides, the arc-shaped blocking block (201) is arranged on the inner side of the valve body (101) and located in the containing groove at the bottom of the valve body (101), and the 7-shaped linkage rod (202) is symmetrically fixed to the top of the arc-shaped blocking block (201) and the vertical parts of the two 7-shaped linkage rods (202) are respectively attached to the inner wall side of the valve body (101) and the bottom side of the gate (103), and the horizontal part of the 7-shaped linkage rod (202) is slidably connected to the inner side of the concave groove (104); When the gate (103) is moved upward, the horizontal part of the 7-shaped linkage rod (202) is pulled upward through the bottom of the concave groove (104), so as to move the arc-shaped blocking block (201) upward and block the inside of the containing groove at the bottom of the valve body (101); When the gate (103) is moved downward, the horizontal part of the 7-shaped linkage rod (202) is pressed downward through the top of the concave groove (104), so as to move the arc-shaped blocking block (201) downward, thereby ensuring that the bottom of the gate (103) is inserted into the containing groove at the bottom of the valve body (101).

3. The emergency shut-off device for coal powder delivery according to claim 2, characterized in that, The self-locking unit comprises an L-shaped telescopic groove (203), an L-shaped lock block (204) and a spring (205); The L-shaped telescopic groove (203) is arranged in the horizontal part of the 7-shaped linkage rod (202) and penetrates the top and one side of the horizontal part, the L-shaped lock block (204) is slidably connected to the inside of the L-shaped telescopic groove (203) and protrudes from the top and one side of the horizontal part of the 7-shaped linkage rod (202); The spring (205) is arranged in the L-shaped telescopic groove (203) and attached to the inner wall side of the L-shaped telescopic groove (203) and the vertical side of the L-shaped lock block (204), so as to provide horizontal thrust for the L-shaped lock block (204), when the horizontal part of the 7-shaped linkage rod (202) is moved upward to above the valve body (101), the horizontal part of the L-shaped lock block (204) protrudes to the outside of the 7-shaped linkage rod (202) and is attached to the upper surface of the valve body (101), so as to limit the downward movement of the arc-shaped blocking block (201) and the 7-shaped linkage rod (202).

4. The emergency shut-off device for coal powder delivery according to claim 3, wherein The inner wall top of the concave groove (104) is provided with an inclined pressing groove (105), when the gate plate (103) moves downward to contact the top of the vertical part of the L-shaped lock block (204), the L-shaped lock block (204) is pressed and shrunk horizontally to the inside of the L-shaped telescopic groove (203), and the self-locking is unlocked.

5. The emergency shut-off device for coal powder delivery according to claim 2, wherein The limiting unit comprises limiting blocks (206); The limiting blocks (206) are provided with two, and the two limiting blocks (206) are symmetrically fixed to the top of the two sides of the arc-shaped blocking block (201), the inner wall of the valve body (101) is provided with a limiting sliding groove (106) at the contact position of the limiting block (206), and the limiting sliding groove (106) is used for limiting the upward height of the limiting block (206).

6. The emergency shut-off device for coal powder delivery according to claim 2, wherein The arc-shaped blocking block (201) is composed of an arc-shaped block (2011) and inclined edges (2012), the two inclined edges (2012) are symmetrically fixed to the top end of the arc-shaped block (2011), the inner wall diameter of the arc-shaped block (2011) matches the inner ring diameter of the bottom accommodating groove of the valve body (101), and the outer diameter of the arc-shaped block (2011) is smaller than the outer ring diameter of the bottom accommodating groove of the valve body (101). The bottom track of the gate plate (103) matches the inner track of the arc-shaped blocking block (201).

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