Valve and bag type dust collector

Abstract

The utility model belongs to the configuration field of lift valve sealing, and particularly relates to a valve and a bag type dust collector. The valve comprises a shell and a valve plate rotatably arranged in the shell, a limiting piece used for being matched with the valve plate in a stopping mode when the valve plate rotates to a closed state is fixed to the inner wall of the shell, the limiting piece is provided with a first face and a second face which are perpendicular to each other or form an acute included angle, and an edge is formed between the first face and the second face. A bend is arranged at the end of the valve plate, a sealing piece is fixed to the valve plate or the limiting piece, and the sealing piece is provided with a clamping portion clamped between the bent portion of the bend and the edge when the valve plate is in a closed state, so that the bent portion indirectly abuts against the edge through the clamping portion and is in sealing fit with the edge. Sealing of the valve is achieved through the mode similar to linear contact between the bent part and the edge, the influence of deformation generated by the influence of the machining technology on the sealing effect of the limiting piece and the valve plate is weakened, and the sealing performance between the valve plate and the limiting piece is improved.

Description

Technical Field

[0001] The utility model relates to a valve and a bag-type dust collector, belonging to the field of dust removal equipment. Background Art

[0002] As a dry dust filtration device, the bag filter mainly uses fibrous filter bags to capture dust in dust-laden gases. When dust-laden gases such as flue gas and exhaust gas are transported into the dust collector through the flue, large dust particles settle into the ash hopper under the action of gravity, while fine dust moves with the airflow and is retained when passing through the filter bags, thus purifying the gas. Bag filters are usually equipped with multiple bag chambers, each of which is independent of each other. Valves for isolating or releasing dust-laden gas are respectively installed between the gas inlet of each bag chamber and the flue. Therefore, for bag filters that require online maintenance, when a bag chamber in the bag filter needs maintenance, it is only necessary to close the corresponding valve and open the bag chamber for maintenance without shutting down the entire production line, thus ensuring production needs.

[0003] like Figure 1 As shown, the valve in the prior art generally includes a housing 1, a valve plate 2, a rotating shaft 3, and a sealing angle steel (i.e., a limiter) and a fixing angle steel 9 (i.e., a fixing member) fixed to the inner wall of the housing 1. Figure 1-3 As shown, the valve plate 2 is rectangular, and there are two sealing angle steels, namely the first sealing angle steel 4 and the second sealing angle steel 5, which are respectively used to cooperate with the two long sides of the valve plate 2 when the valve plate 2 rotates to the closed state. The fixed angle steel 9 is located on the inner wall of the shell 1 at a position corresponding to the two short sides of the valve plate 2 when the valve plate 2 is in the closed state. There are four fixed angle steels 9, and each short side corresponds to two fixed angle steels 9 to avoid the rotating shaft 3. The fixed angle steels 9 do not have a limiting function, that is, they do not cooperate with the two short sides of the valve plate 2. When the valve plate 2 is in the closed state, as shown in FIG. Figure 3 As shown, the valve plate 2 contacts the plane of the sealing angle steel, and the sealing position between the two long sides of the valve plate 2 and the corresponding sealing angle steel is the contact surface between the two. The two long side ends of the valve plate 2 are provided with a bend 21, and the bend 21 extends in the direction away from the corresponding sealing angle steel. The rotating shaft 3 is located on the center line of the valve plate 2, and the rotating shaft 3 is connected to the output end of the driving unit 8 to drive the valve plate 2 to rotate. A limiting angle steel 11 is also fixed on the inner wall of the shell 1 to cooperate with the valve plate 2 when the valve plate 2 rotates to the valve open state. When closing the valve, the driving unit 8 starts and drives the valve plate 2 to rotate through the rotating shaft 3 until the valve plate 2 and the sealing angle steel contact the plane to close the valve. At this time, the valve plate 2 and the sealing angle steel are tightly sealed by the contact surface, preventing the outside air with lower temperature from entering the flue after the bag chamber is opened, causing the high temperature and high humidity dust-containing gas in the flue to condense and form a caked object, resulting in flue clogging and affecting the dust removal efficiency.

[0004] The limiters in the valve can also be made of rectangular channel steel, U-shaped channel steel, etc. However, in actual production, the limiters and valve plates will be deformed and bent during production, and the limiters will also be deformed when welded and fixed, and leveling after welding is more difficult. Therefore, after multiple deformations are concentrated, the valve plate and the limiter plane cannot be completely fitted together, which leads to poor valve sealing and excessive air leakage. Utility Model Content

[0005] The present utility model aims to provide a valve that solves the problem that existing valves achieve sealing when closed by contacting the valve plate with a stopper plane. However, the stopper and valve plate may deform due to processing, resulting in incomplete contact between the valve plate and the stopper plane, which in turn leads to poor valve sealing and excessive air permeability. The present utility model also aims to provide a bag dust collector to solve the above-mentioned problem.

[0006] To achieve the above objectives, the valve in this utility model adopts the following technical solutions:

[0007] A valve comprises an outer shell and a valve plate rotatably arranged in the outer shell, a limiter is fixed on the inner wall of the outer shell for cooperating with the valve plate when the valve plate is rotated to a closed state, the limiter has a first surface and a second surface that are perpendicular to each other or at an acute angle, an edge is formed between the first surface and the second surface, the end of the valve plate is provided with a bend, a sealing member is fixed on the valve plate or the limiter, the sealing member has a clamping portion clamped between the bent portion and the edge when the valve plate is in a closed state, so that the bent portion is indirectly pressed and sealed against the edge through the clamping portion.

[0008] The beneficial effect of the above technical solution is that: the utility model belongs to the invention of the element relationship change type, which changes the sealing position between the valve plate and the limiter, and changes the sealing form between the valve plate and the limiter by surface contact in the prior art to a sealing form by similar line contact between the bent portion of the valve plate and the edge of the limiter. The limiter has a first surface and a second surface that are perpendicular to each other or at an acute angle, and an edge is formed between the first surface and the second surface. The end of the valve plate is provided with a bend, and the bent portion of the bend can cooperate with the edge stop, and there is line contact between the bent portion of the bend and the edge. The line contact method reduces the contact area between the valve plate and the limiter. Compared with the method of sealing by surface contact, it effectively reduces the processing accuracy requirements for the valve plate and the limiter, thereby reducing the influence of the deformation caused by the processing technology on the sealing effect. A seal is fixedly arranged on the valve plate or the limiter, and the seal has a clamping portion that is clamped between the bent portion and the edge when the valve plate is in a closed state. The seal further enhances the sealing effect between the bent portion and the edge of the stopper. When the valve disc rotates to the closed position, the bent portion compresses the seal, pressing the seal against the edge of the stopper. The portion of the seal between the bent portion and the edge forms the clamping portion. Through the clamping portion, the bent portion indirectly presses against the edge, creating a seal similar to line contact. This effectively reduces the effect of machining-induced deformation of the stopper and valve disc on the sealing effect, improving the seal between the valve disc and the stopper and reducing the air leakage rate of the valve.

[0009] Furthermore, the sealing member is a high temperature resistant sealing member.

[0010] Furthermore, the sealing element is made of stainless steel sheet.

[0011] Furthermore, the thickness of the stainless steel sheet is 0.5 mm to 1 mm.

[0012] Furthermore, the sealing member is fixed to the limiting member by a detachable fastener.

[0013] Furthermore, the detachable fastener includes a bolt and a nut, and the limiting member and the sealing member are respectively provided with bolt through-holes for the bolt to pass through.

[0014] Furthermore, the valve plate is a rectangular structure, and the two long sides of the valve plate are respectively provided with the aforementioned bends. The seal is a long side seal that cooperates with the two long sides of the valve plate. The two short sides of the valve plate are respectively perpendicular to the rotation axis of the valve plate. Fixing parts with a spacing greater than the length of the valve plate are fixed on the two opposite inner walls of the outer shell, and short side seals are fixed on the two short sides of the fixing part or the valve plate. The short side seals are used to achieve sealing between the short side and the fixing part when the valve plate is in a closed state.

[0015] Furthermore, the short side sealing member is made of a stainless steel sheet with a thickness of 0.5 mm to 1 mm.

[0016] Furthermore, the limiting piece and the fixing piece are both made of angle steel.

[0017] In order to achieve the above purpose, the bag dust collector in the present invention adopts the following technical solutions:

[0018] A bag dust collector comprises a dust collector body and an air intake valve connected to the dust collector body, the air intake valve comprises an outer shell and a valve plate rotatably arranged in the outer shell, a limiter is fixed to the inner wall of the outer shell for cooperating with the valve plate when the valve plate rotates to a closed state, the limiter has a first surface and a second surface that are perpendicular to each other or at an acute angle, an edge is formed between the first surface and the second surface, the end of the valve plate is provided with a bend, a sealing member is fixed to the valve plate or the limiter, the sealing member has a clamping portion clamped between a bent portion of the bend and the edge when the valve plate is in a closed state, so that the bent portion is indirectly pressed and sealed against the edge through the clamping portion.

[0019] The beneficial effect of the above technical solution is that: the utility model is an improved invention, which further optimizes the sealing of the intake valve. The limiter has a first surface and a second surface that are perpendicular to each other or at an acute angle, and an edge is formed between the first surface and the second surface. The end of the valve plate is provided with a bend, and the bent portion of the bend can cooperate with the edge stop, and the bent portion of the bend is in line contact with the edge. The line contact method reduces the contact area between the valve plate and the limiter, and compared with the method of sealing by surface contact, it effectively reduces the requirements for processing accuracy, thereby reducing the influence of the deformation caused by the processing technology on the sealing effect. A sealing member is fixedly arranged on the valve plate or the limiter, and the sealing member has a clamping portion that is clamped between the bent portion and the edge when the valve plate is in a closed state. The seal further enhances the sealing effect between the bent portion and the edge of the stopper. When the valve disc rotates to the closed position, the bent portion compresses the seal against the edge of the stopper. The portion of the seal between the bent portion and the edge is the clamping portion. This means that the bent portion indirectly presses against the edge through the clamping portion, creating a seal similar to line contact. This effectively reduces the effect of deformation of the stopper and valve disc caused by the machining process on the sealing effect, improves the sealing between the valve disc and the stopper, and reduces the air leakage rate of the valve.

[0020] Furthermore, the sealing member is a high temperature resistant sealing member.

[0021] Furthermore, the sealing element is made of stainless steel sheet.

[0022] Furthermore, the thickness of the stainless steel sheet is 0.5 mm to 1 mm.

[0023] Furthermore, the sealing member is fixed to the limiting member by a detachable fastener.

[0024] Furthermore, the detachable fastener includes a bolt and a nut, and the limiting member and the sealing member are respectively provided with bolt through-holes for the bolt to pass through.

[0025] Furthermore, the valve plate is a rectangular structure, and the two long sides of the valve plate are respectively provided with the aforementioned bends. The seal is a long side seal that cooperates with the two long sides of the valve plate. The two short sides of the valve plate are respectively perpendicular to the rotation axis of the valve plate. Fixing parts with a spacing greater than the length of the valve plate are fixed on the two opposite inner walls of the outer shell, and short side seals are fixed on the two short sides of the fixing part or the valve plate. The short side seals are used to achieve sealing between the short side and the fixing part when the valve plate is in a closed state.

[0026] Furthermore, the short side sealing member is made of a stainless steel sheet with a thickness of 0.5 mm to 1 mm.

[0027] Furthermore, the limiting piece and the fixing piece are both made of angle steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a valve in the prior art;

[0029] Figure 2 A top view of a valve in the prior art;

[0030] Figure 3 Schematic diagram of the matching of the valve plate and the sealing angle steel in the valve in the prior art;

[0031] Figure 4 This is a front view of a valve embodiment of the present invention;

[0032] Figure 5 A top view of an embodiment of a valve in the present invention (the stainless steel sheet is not shown);

[0033] Figure 6 This is a schematic diagram of the matching of the valve plate and the sealing angle steel in the valve embodiment of the present utility model (the stainless steel sheet is not deformed by compression);

[0034] Figure 7 This is a schematic diagram of the valve plate in the valve embodiment of the present invention after the stainless steel sheet is deformed by compression.

[0035] In the figure: 1. Housing; 2. Valve plate; 21. Bend; 3. Rotating shaft; 4. First sealing angle steel; 41. First surface; 42. Second surface; 5. Second sealing angle steel; 51. First surface; 52. Second surface; 6. Stainless steel sheet; 61. Fixing portion; 62. Bending portion; 63. Clamping portion; 7. Bolt; 8. Drive unit; 9. Fixing angle steel; 10. Nut; 11. Limiting angle steel. DETAILED DESCRIPTION

[0036] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0037] In response to the technical problems existing in the prior art, the basic technical concept of the present invention is: to seal the valve plate and the limiter through line contact, reduce the influence of processing accuracy on the sealing effect, and then set a sealing member between the valve plate and the limiter, so that the valve plate and the limiter are in indirect contact through the sealing member, thereby further improving the sealing performance.

[0038] The embodiment of the valve in the utility model:

[0039] like Figure 4 As shown, in this embodiment, the direction of the valve inlet and the direction of the valve outlet are perpendicular to each other. Figure 4-6 As shown, the valve includes a housing 1 and a valve plate 2 rotatably disposed within the housing 1. In this embodiment, the valve plate 2 is a rectangular structure. A rotating shaft 3 is fixedly disposed at the center line of the valve plate 2. The long side of the valve plate 2 is parallel to the rotating shaft 3, and the short side is perpendicular to the rotating shaft 3. The rotating shaft 3 is connected to a drive unit 8. When in use, the drive unit 8 can drive the valve plate 2 to rotate through the rotating shaft 3. The end of the valve plate 2 is provided with a bend. In this embodiment, as shown in FIG. Figure 6 and Figure 7 As shown, bends 21 are provided at the ends of the two long sides of the valve plate 2. Specifically, the extension directions of the bends 21 at the two long side ends are opposite.

[0040] like Figure 4-7 As shown, a stopper is fixed on the inner wall of the housing 1 for engaging with the valve plate 2 when the valve plate 2 rotates to the closed state. The stopper is used to engage with the long side of the valve plate 2. The stopper has a first surface and a second surface that are perpendicular to each other or at an acute angle, and an edge is formed between the first surface and the second surface. In this embodiment, the stopper is configured as a sealing angle steel. There are two sealing angle steels, such as Figure 6 As shown, one of them is fixed to the vertical part of the shell 1, which is the first sealing angle steel 4, with the position of the first sealing angle steel 4 as the upper left corner, and the other sealing angle steel is the second sealing angle steel 5. The second sealing angle steel 5 is fixed to the inclined part of the shell 1 and is located at the lower right corner. The wider and mutually perpendicular end faces of the first sealing angle steel 4 are respectively the first face 41 and the second face 42. One of the wider end faces of the second sealing angle steel 5 is welded and fixed to the shell 1, and the other wider end face is the first face 51. The narrower end face perpendicular to the first face 51 is the second face 52. Edges are formed between the first face 41 and the second face 42, and between the first face 52 and the second face 52. As shown Figure 4 As shown, a limiting angle steel 11 is fixed on the inner wall of the housing 1 for engaging with the valve plate 2 when the valve plate 2 rotates to the open state.

[0041] Long side seals are fixed on the two long sides of the valve plate 2 or the sealing angle steel. In this embodiment, as shown in FIG. Figure 6 and Figure 7 As shown, the long side seals are fixed on the sealing angle steel, specifically, on the first surface 41 and the first surface 51 respectively. Since the dust-laden gas in the bag filter has a relatively high temperature, and the temperature can reach about 300°, the seals should be high temperature resistant seals to ensure that they will not be damaged by high temperature in a short period of time. In this embodiment, the seal is set as a stainless steel sheet 6, which has good high temperature resistance and can be used in high temperature environments above 300°. At the same time, the cost of stainless steel is also relatively low, which reduces the production and use costs of the valve. Figure 7 As shown, the stainless steel sheet 6 includes a fixing portion 61, a bending portion 62 and a clamping portion 63 connected between the fixing portion 61 and the bending portion 62. Taking the first sealing angle steel 4 as an example, the fixing portion 61 is fixed to the first surface 41 by a detachable fastener, and the fixing portion 61 is tightly fitted to the first surface 41. In this embodiment, the detachable fastener includes a bolt 7 and a nut 10. Bolt through holes for the bolt 7 to pass through are respectively provided on the first surface 41 and the fixing portion 61, and the two corresponding bolt through holes should ensure a certain position accuracy.

[0042] After the stainless steel sheet 6 is installed, when the valve is used for the first time, the stainless steel sheet 6 is in a straight state ( Figure 6 As shown), at this time, the stainless steel sheet 6 has an overhanging section overhanging the outside of the corresponding sealing angle steel. Taking the first sealing angle steel 4 as an example, Figure 7As shown, when the valve plate 2 rotates to contact the stainless steel sheet 6, the valve plate 2 exerts a top pressure on the overhanging section of the stainless steel sheet 6. As the valve plate 2 continues to rotate, the overhanging section of the stainless steel sheet 6 is gradually bent, and the fixing portion 61 fits tightly against the first surface 41. When the valve plate 2 is rotated into place, the stainless steel sheet 6 forms the above-mentioned bending portion 62 and the above-mentioned clamping portion 63. At this time, the clamping portion 63 is located between the bending portion 21 of the valve plate 2 and the edges of the first surface 41 and the second surface 42 of the first sealing angle steel 4, that is, the bend 21 indirectly presses the edge between the first surface 41 and the second surface 42 through the clamping portion 63, thereby realizing the seal between the bend 21 and the first sealing angle steel 4. At this time, there is a line contact between the bending portion of the bend 21 and the clamping portion 63. Compared to the prior art method of sealing by face-to-face contact between the valve plate 2 and the sealing angle steel, the method of sealing by utilizing the curved portion of bend 21 and the edges of the sealing angle steel effectively reduces the area of ​​the valve plate 2 and the sealing angle steel required for sealing, thereby effectively lowering the requirements for machining precision. However, if the curved portion of bend 21 were in direct contact with the edges of the sealing angle steel, certain requirements for the straightness of the edges of the sealing angle steel would also exist, and a certain level of machining precision would still be required to ensure the valve's sealing effect. Therefore, a stainless steel sheet 6 is provided between the valve plate 2 and the sealing angle steel to compensate for manufacturing and installation errors between the valve plate 2 and the sealing angle steel.

[0043] When the valve plate 2 is closed again, it will still contact the clamping portion 63 until the limit position, thus achieving a sealing effect.

[0044] The thickness of the stainless steel sheet 6 is 0.5 mm to 1 mm. If the stainless steel sheet 6 is too thick, it may not be able to be bent and thus affect the sealing effect. If it is too thin, the production cost will be high. The preferred thickness of the stainless steel sheet 6 is 0.75 mm.

[0045] like Figure 5As shown, fixings are secured to the inner walls of the housing 1 corresponding to the short sides of the valve plate 2. In this embodiment, the fixings are also made of angle steel and are configured as fixed angle steels 9. The spacing between the two fixing angle steels 9 is greater than the length of the valve plate 2. Short-side seals (not shown) are secured to the fixing angle steels 9 or to the two short sides of the valve plate 2 to provide a seal between the short sides and the fixing angle steels 9 when the valve plate 2 is closed. In this embodiment, the short-side seals are secured to the fixing angle steels 9. Specifically, the short-side seals are also constructed of stainless steel sheets with a thickness of 0.5 mm to 1 mm, preferably 0.75 mm. The short-side seals also include a fixing portion and a bent portion, the fixing portion of which is secured to the fixing angle steels 9 via bolts and nuts. When the short-side seals are initially installed, they are straight, just like the long-side seals. They are also bent during the closing process of the valve plate 2. However, since the fixing angle steels 9 themselves do not block the valve plate 2, the short-side seals bend more significantly. Of course, during use, by controlling the installation accuracy of the valve plate 2 and the angle steel, it is ensured that the valve plate 2 contacts the corresponding parts of the long side seal and the short side seal at the same time when it rotates to the closed state.

[0046] In other embodiments of the valve, when setting the structure of the limiter and the fixed angle steel, the limiter fixed to the vertical part of the shell can be set as a triangular prism with a right triangle cross-section, and the limiter fixed to the inclined part of the shell and the fixed angle steel can be set as a rectangular steel pipe or U-shaped channel steel, etc.

[0047] In other embodiments of the valve, the stainless steel sheet can be bent directly instead of being bent by the valve plate. In other embodiments of the valve, when setting the thickness of the long side seal and the short side seal, the thickness can be set to 0.5 mm, 1 mm, 0.7 mm, etc.

[0048] In other embodiments of the valve, when providing the long side seal and the short side seal, thin plates made of other high temperature resistant metals such as chromium nickel alloy may be used.

[0049] In other embodiments of the valve, a fireproof cloth made of ceramic fiber can be used as a seal, and the fireproof cloth can be wrapped and fixed on the sealing angle steel and the fixed angle steel, or wrapped and fixed on the edge of the valve plate. In other embodiments of the valve, when setting the valve plate structure, the valve plate can be set to a circular shape. At this time, the shape of the valve shell should be changed accordingly to ensure that the valve plate can be in a closed state. A circle of bends is set on the edge of the valve plate, with the valve plate rotation axis as the boundary, and the extension directions of the bends on both sides of the rotation axis are opposite. The inner wall of the shell is provided with a sealing angle steel for cooperating with the valve plate stop, and a stainless steel sheet is fixed on the sealing angle steel. The stainless steel sheet has a clamping portion that is clamped between the bent portion and the edge of the sealing angle steel when the valve plate is in a closed state, so that the bent portion is indirectly pressed and sealed against the edge through the clamping portion.

[0050] In other embodiments of the valve, when a detachable fastener is provided, the detachable fastener may be provided as a self-tapping screw or the like.

[0051] In other embodiments of the valve, when setting a fixing method for the sealing member, the sealing member may be fixed to the limiting member by bonding or welding.

[0052] In other embodiments of the valve, when a seal is provided, the seal may not have high temperature resistance. In this case, the valve is no longer suitable for use in a bag filter, but can be used in other non-high temperature environments.

[0053] In other embodiments of the valve, the sealing member may be fixed to the valve plate when the position of the sealing member is set.

[0054] An embodiment of the bag dust collector in the present invention: The bag dust collector includes a dust collector body and an air intake valve connected to the dust collector body. The structure of the air intake valve is the same as that of the above-mentioned valve embodiment and will not be repeated.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A valve, characterized in that: The invention comprises an outer shell and a valve plate rotatably arranged in the outer shell, a limiter is fixed on the inner wall of the outer shell for cooperating with the valve plate when the valve plate is rotated to a closed state, the limiter has a first surface and a second surface which are perpendicular to each other or at an acute angle, an edge is formed between the first surface and the second surface, the end of the valve plate is provided with a bend, a sealing member is fixed on the valve plate or the limiter, the sealing member has a clamping portion which is clamped between the bent portion and the edge when the valve plate is in a closed state, so that the bent portion is indirectly pressed and sealed against the edge through the clamping portion.

2. The valve according to claim 1, characterized in that The sealing element is a high temperature resistant sealing element.

3. The valve according to claim 2, characterized in that The sealing element is made of stainless steel sheet.

4. The valve according to claim 3, characterized in that The thickness of the stainless steel sheet is 0.5mm~1mm.

5. The valve according to any one of claims 1 to 4, characterized in that: The sealing member is fixed to the limiting member through a detachable fastener.

6. The valve according to claim 5, characterized in that The detachable fasteners include bolts and nuts, and the limiting member and the sealing member are respectively provided with bolt through-holes for the bolts to pass through.

7. The valve according to any one of claims 1 to 4, characterized in that: The valve plate has a rectangular structure, and the two long sides of the valve plate are respectively provided with the aforementioned bends. The seals are long side seals that cooperate with the two long sides of the valve plate. The two short sides of the valve plate are respectively perpendicular to the rotation axis of the valve plate. Fixings with a spacing greater than the length of the valve plate are fixed on the two opposite inner walls of the outer shell. Short side seals are fixed on the fixings or the two short sides of the valve plate. The short side seals are used to achieve sealing between the short sides and the fixings when the valve plate is in a closed state.

8. The valve according to claim 7, characterized in that The short side seal is made of 0.5mm~1mm thick stainless steel sheet.

9. The valve according to claim 7, characterized in that The limiting parts and fixing parts are made of angle steel.

10. A bag dust collector, comprising a dust collector body and an air inlet valve connected to the dust collector body, characterized in that: The air intake valve is the valve according to any one of claims 1 to 9.

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