An anti-closing device for an offline valve of a bag filter and the offline valve

Abstract

The present invention relates to an anti-self-closing device for an off-line valve of a bag filter, which includes a housing and an anti-self-closing mechanism. The housing is fixed on the valve stem of the off-line valve; the anti-self-closing mechanism is arranged inside the housing, and the anti-self-closing mechanism includes a contraction component and a moving component. The contraction components are arranged on both sides of the housing, and one end of the contraction component protrudes from the housing; by adding a contraction component to the anti-self-closing mechanism, the anti-self-closing mechanism can achieve passive contraction and active reset functions during the ascending process, and the anti-self-closing mechanism can be fixed above the anti-falling crossbeam without manual intervention. At the same time, by adding a moving component, the active retraction action of the contraction mechanism during the descending process of the anti-self-closing mechanism is realized, and the automatic contraction and descending action of the anti-self-closing mechanism can be realized without manual intervention, solving the problem that the off-line valve is likely to fall when power is lost and eliminating the need for manual disassembly and assembly, realizing the automatic anti-self-closing function of the off-line valve, thereby reducing the occurrence of safety accidents.

Description

Technical Field

[0001] The present application relates to the field of off-line valves for bag filters, and particularly to an anti-self-closing device and an off-line valve for an off-line valve of a bag filter. Background Art

[0002] At present, large-scale pulse bag filters at home and abroad have been widely used in various fields. With the continuous strictness of environmental protection emission standards, the technical requirements for filter equipment have become more stringent. At the same time, the technical requirements for the off-line valve, a key component of the filter, have also been improved. The general form of the off-line valve 3 is a pneumatic structure. Due to the working characteristics of the air cylinder 31, the pneumatic off-line valve can only work at two positions, the starting point and the end point. The action of the air cylinder 31 driving the valve plate 35 is controlled by a solenoid valve. When the control system loses power abnormally, the solenoid valve loses power, and the valve plate 35 falls onto the valve seat under the action of gravity. At this time, the off-line valve 3 is in the closed state. Or when there is a problem with the compressed air system and the compressed air loses pressure, the valve plate 35 will also fall onto the valve seat under the action of gravity, and a safety accident will occur during the maintenance state.

[0003] Please refer to Figure 1 and Figure 2 , in the prior art, in order to avoid the accident of the off-line valve 3 falling and closing due to power loss and air loss during operation, a first anti-self-closing component 4 is welded on the valve stem 32 of the off-line valve 3. It is required that the operator install a second anti-self-closing component 5 on-site when the unit starts and runs. After the valve stem 32 rises through the anti-falling cross beam 34, the first anti-self-closing component 4 leans on the upper side of the second anti-self-closing component 5 to achieve the holding state of the off-line valve 3. Since the installation of the second anti-self-closing component 5 is manual installation and also needs to be manually disassembled after the maintenance is completed, it is difficult to operate and the steps are cumbersome in actual use. There is also a risk of the off-line valve 3 losing power and falling during the disassembly and assembly process, thus causing a safety accident. Summary of the Invention

[0004] In view of the above problems, the present application provides an anti-self-closing device and an off-line valve for an off-line valve of a bag filter, which solves the problem of manually installing a second anti-self-closing component and also requires manual disassembly after the maintenance is completed.

[0005] To achieve the above object, the applicant provides an anti-self-closing device for an off-line valve of a bag filter, which includes a housing and an anti-self-closing mechanism. The housing is fixed on the valve stem of the off-line valve. The anti-self-closing mechanism is arranged in the housing and includes a contraction component and a moving component. The contraction components are arranged on both sides of the housing, and one end of the contraction component protrudes from the housing. The contraction component includes a contracted state and a reset state. When the contraction component is in the contracted state, the valve stem rises to the anti-falling cross beam of the off-line valve, and the contraction component contacts the anti-falling cross beam and contracts. When the contraction component is in the reset state, the contraction component is erected on the anti-falling cross beam. The contraction component is connected to the moving component, and the moving component is used to drive the contraction component to move horizontally to contract or reset the contraction component.

[0006] In some embodiments, the contraction component includes two pawls, two placement cavities, and two first elastic components. The pawls are arranged on both sides of the housing. The first elastic component is arranged in the placement cavity. One end of the first elastic component is connected to the moving component, and the other end of the first elastic component is connected to one end of the pawl. The pawl is hinged in the placement cavity, and the other end of the pawl protrudes from the housing. When the pawl contacts the anti-falling cross beam, the first elastic component contracts. When the pawl is erected on the anti-falling cross beam, the first elastic component returns to its original state.

[0007] In some embodiments, the first elastic component includes a first elastic member and a guiding member. One end of the first elastic member is connected to the moving component, and the other end of the first elastic member is connected to the guiding member. One end of the guiding member extends into the first elastic member, and the other end of the guiding member is connected to one end of the pawl. The guiding member is used to guide the first elastic member.

[0008] In some embodiments, the pawl further includes a pawl wheel, and the pawl wheel is arranged on the other end of the pawl. The pawl wheel is used to reduce friction when contacting the anti-falling cross beam.

[0009] In some embodiments, the moving component includes a driving unit, a gear, two racks, and two second elastic members. The gear is meshed with the racks at its upper and lower ends. One end of the second elastic member is connected to the inner side of the housing, and the other end of the second elastic member is connected to the rack. The moving directions of the two racks are opposite. The rack is connected to the contraction component, and the driving unit is connected to the gear. The driving unit is used to drive the gear to rotate to contract the contraction component, and the second elastic member is used to reset the contraction component.

[0010] In some embodiments, the moving assembly further includes at least two guide wheels disposed in the same horizontal direction; a guide groove is formed in the rack, and the guide wheels are fixed in the guide groove, and the guide wheels are configured to move the rack along the horizontal direction.

[0011] In some embodiments, the moving assembly further includes at least one limiting wheel fixed in the guide groove, and the limiting wheel is configured to limit the movement of the rack.

[0012] In some embodiments, the moving assembly further includes a limiting strip, and the limiting strip is disposed on a side of the second elastic member away from the housing, and the limiting strip is configured to prevent the second elastic member from bending in the radial direction.

[0013] In some embodiments, the housing further includes two receiving members fixed to the inner side of the housing; a convex block is disposed on one side of the rack and protrudes toward the receiving member, one end of the second elastic member is connected to the receiving member, and the other end of the second elastic member is connected to the convex block, and the receiving member is configured to receive the convex block.

[0014] Different from the prior art, the above technical solution adds a contraction assembly to the anti-self-closing mechanism, so that the anti-self-closing mechanism can achieve passive contraction and active reset functions during the ascending process, and the anti-self-closing mechanism can be fixed above the anti-falling cross beam without manual intervention. At the same time, a moving assembly is added to realize the active retraction action of the contraction mechanism during the descending process of the anti-self-closing mechanism, and the automatic contraction and descending action of the anti-self-closing mechanism can be realized without manual intervention, solving the problem that the offline valve is likely to fall when losing power and eliminating the need for manual disassembly and assembly, realizing the automatic anti-self-closing function of the offline valve, thereby reducing the occurrence of safety accidents.

[0015] To achieve the above object, the inventor also provides an offline valve, including a cylinder, a valve rod, a bracket and an anti-falling cross beam, the valve rod is connected to the cylinder, and the bracket is disposed below the cylinder; the anti-falling cross beam is fixed to the bracket; and any one of the anti-self-closing devices for the offline valve of the bag filter provided by the inventor above is fixed to the valve rod.

[0016] Different from the prior art, the above technical solution adds a contraction assembly to the anti-self-closing mechanism, so that the anti-self-closing mechanism can achieve passive contraction and active reset functions during the ascending process, and the anti-self-closing mechanism can be fixed above the anti-falling cross beam without manual intervention. At the same time, a moving assembly is added to realize the active retraction action of the contraction mechanism during the descending process of the anti-self-closing mechanism, and the automatic contraction and descending action of the anti-self-closing mechanism can be realized without manual intervention, solving the problem that the offline valve is likely to fall when losing power and eliminating the need for manual disassembly and assembly, realizing the automatic anti-self-closing function of the offline valve, thereby reducing the occurrence of safety accidents.

[0017] The above description of the invention content is only an overview of the technical solution of this application. In order to enable those of ordinary skill in the art to more clearly understand the technical solution of this application, and then be able to implement it based on the content described in the specification and the drawings, and in order to make the above objects, other objects, features, and advantages of this application more easily understood, the following is described in conjunction with the specific embodiments of this application and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the specific embodiments of this application and other related contents, and should not be considered as a limitation to this application.

[0019] In the drawings of the specification:

[0020] Figure 1 It is a schematic diagram of the usage process of the anti-autoclosing component and the offline valve described in the background art;

[0021] Figure 2 It is another schematic diagram of the usage process of the anti-autoclosing component and the offline valve described in the background art;

[0022] Figure 3 It is a schematic diagram of the usage process of the offline valve with an anti-autoclosing mechanism described in the specific embodiment;

[0023] Figure 4 It is another schematic diagram of the usage process of the offline valve with an anti-autoclosing mechanism described in the specific embodiment.

[0024] Figure 5 It is a side view of the internal cross-section of the anti-autoclosing mechanism described in the specific embodiment;

[0025] Figure 6 It is a side view of the exterior of the anti-autoclosing mechanism described in the specific embodiment.

[0026] The descriptions of the reference numerals involved in the above drawings are as follows:

[0027] 1. Housing;

[0028] 11. Accommodating member;

[0029] 2. Anti-autoclosing mechanism;

[0030] 211. Pawl;

[0031] 212. Placement cavity;

[0032] 213. First elastic member;

[0033] 214. Pawl wheel;

[0034] 215. Guide member;

[0035] 221. Driving unit;

[0036] 222. Gear;

[0037] 223. Rack;

[0038] 224. Second elastic member;

[0039] 225. Guide wheel;

[0040] 226. Guide groove;

[0041] 227. Limit bar;

[0042] 228. Bump;

[0043] 229. Limit wheel;

[0044] 23. Travel switch;

[0045] 3. Offline valve;

[0046] 31. Cylinder;

[0047] 32. Valve stem;

[0048] 33. Bracket;

[0049] 34. Anti-falling cross beam;

[0050] 35. Valve plate;

[0051] 4. First anti-self-closing assembly;

[0052] 5. Second anti-self-closing assembly. Detailed implementation manners

[0053] To illustrate in detail the possible application scenarios, technical principles, specific implementable solutions, achievable objectives and effects of this application, etc., the following is a detailed description in combination with the specific examples listed and with reference to the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0054] Referring to "embodiments" in this article means that the specific features, structures or characteristics described in combination with the embodiments can be included in at least one embodiment of this application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0055] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0056] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist simultaneously. In addition, the character " / " in this text generally represents an "or" logical relationship between the associated objects before and after.

[0057] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationships between these entities or operations.

[0058] Without further limitation, in this application, the expressions "comprising", "including", "having", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product that includes the described elements. Thus, a process, method, or product that includes a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method, or product.

[0059] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the number itself; expressions such as "above", "below", "within", etc. are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically defined.

[0060] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. This is only for the convenience of describing the specific embodiments of this application or facilitating the reader's understanding, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0061] Unless otherwise clearly specified or limited, in the description of the embodiments of the present application, terms such as "installed", "connected", "linked", "fixed", "set" should be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0062] Please refer to Figure 3 and Figure 4 , this embodiment relates to an offline valve 3, including a cylinder 31, a valve stem 32, a bracket 33, and an anti-falling cross beam 34. The valve stem 32 is connected to the cylinder 31, and the bracket 33 is arranged below the cylinder 31; the anti-falling cross beam 34 is fixed on the bracket 33; and an anti-self-closing device for the offline valve of the bag filter, and the anti-self-closing device is fixed on the valve stem 32.

[0063] An offline valve 3 including an anti-self-closing device, the upper part of the offline valve 3 is provided with a cylinder 31, and the piston rod of the cylinder 31 is fixedly connected to the valve stem 32 for driving the valve stem 32 to work up and down. The cylinder 31 is fixed on the bracket 33. Optionally, the bracket 33 is a hollow cylinder. The valve plate 35 is a flat plate for closing the dust cleaning port of the dust collector, the valve plate 35 is fixedly connected to the valve stem 32, and an anti-self-closing device is also arranged in the middle of the valve stem 32. The anti-falling cross beam 34 is fixed on the bracket 33. Specifically, the anti-falling cross beam 34 is arranged on the moving stroke of the valve stem 32. The anti-falling cross beam 34 can be a straight tubular column, and both ends of the anti-falling cross beam 34 are fixedly connected to the inner side of the bracket 33. The number of the anti-falling cross beams 34 is two, and they are symmetrically distributed on both sides where the pawl 211 of the anti-self-closing device is located.

[0064] By adding an anti-self-closing device to the valve stem 32 part, the automatic anti-self-closing function of the offline valve 3 is realized. During dust cleaning or maintenance, input a control signal at the control end to make the valve stem 32 rise. With the help of the one-way self-locking function of the anti-self-closing device, the anti-self-closing device is erected on the anti-falling cross beam 34, so that the offline valve 3 is fixed on the anti-falling cross beam 34; when the dust cleaning or maintenance work is over, input a control signal at the control end to make the valve stem 32 descend and release the self-locking state of the anti-self-closing device, so that the offline valve 3 disengages from the anti-falling cross beam 34 and can automatically descend to the working position. During this process, there is no need for manual disassembly and assembly of the anti-falling cross beam 34, which saves labor costs, improves the safety of the maintenance process at the same time, and reduces the risk of accidents.

[0065] The above technical solution adds a contraction component to the anti-autoclosing mechanism 2, enabling the anti-autoclosing mechanism 2 to achieve passive contraction and active reset functions during the ascending process. The anti-autoclosing mechanism 2 can be fixed above the anti-falling cross beam 34 without manual intervention. At the same time, a moving component is added to achieve the active retraction of the contraction mechanism during the descending process of the anti-autoclosing mechanism 2. The automatic contraction and descending action of the anti-autoclosing mechanism 2 can be realized without manual intervention, solving the problem that the off-line valve 3 is likely to fall when powered off and eliminating the need for manual disassembly and assembly, thus realizing the automatic anti-autoclosing function of the off-line valve 3 and reducing the probability of safety accidents.

[0066] Please refer to Figure 5 With Figure 6 , this embodiment also provides an anti-autoclosing device for the off-line valve of a bag filter, including a housing 1 and an anti-autoclosing mechanism 2. The housing 1 is fixed on the valve stem 32 of the off-line valve 3; the anti-autoclosing mechanism 2 is arranged inside the housing 1. The anti-autoclosing mechanism 2 includes a contraction component and a moving component. The contraction components are arranged on both sides of the housing 1, and one end of the contraction component protrudes from the housing 1; the contraction component includes a contracted state and a reset state. When the contraction component is in the contracted state, the valve stem 32 rises to the anti-falling cross beam 34 of the off-line valve 3, and the contraction component contacts the anti-falling cross beam 34 and contracts. When the contraction component is in the reset state, the contraction component is erected on the anti-falling cross beam 34; the contraction component is connected to the moving component, and the moving component is used to drive the contraction component to move horizontally to contract or reset the contraction component.

[0067] The housing 1 is a structure with an internal cavity. The housing 1 can be made of metal materials, such as stainless steel sheet metal parts. The internal cavity of the housing 1 is used to accommodate the anti-autoclosing mechanism 2. The housing 1 can be fixed on the valve stem 32 of the off-line valve 3 in forms such as welding, threaded locking, and snap connection.

[0068] The anti-autoclosing mechanism 2 includes a contraction component and a moving component. The contraction component and the moving component cooperate to enable the anti-autoclosing mechanism 2 to be erected on the anti-falling cross beam 34 when the off-line valve 3 is opened, and the anti-autoclosing mechanism 2 follows the valve stem 2 to descend and reset when the off-line valve 3 is closed. Its working principle is as follows:

[0069] Please refer to Figure 5, the direction indicated by the arrow in the figure represents the downward direction, and the direction opposite to the arrow represents the upward direction. The contraction component has the functions of one-way automatic contraction and automatic reset. The valve stem 32 drives the anti-autoclosing mechanism 2 in the housing 1 to rise. As the anti-autoclosing mechanism 2 rises, the contraction component will contact the anti-falling crossbeam 34. There is a structural interference between the contraction component and the anti-falling crossbeam 34. The lower surface of the anti-falling crossbeam 34 gives the contraction component a downward contact force, causing the contraction component to contract downward, so that the anti-autoclosing mechanism 2 can continue to move upward relative to the anti-falling crossbeam 34 until the anti-autoclosing mechanism 2 is completely above the anti-falling crossbeam 34, and the contraction component can automatically reset. At this time, the end of the contraction component protruding from the housing 1 abuts against the upper surface of the anti-falling crossbeam 34, fixing the offline valve 3 on the anti-falling crossbeam 34 to prevent the offline valve 3 from dropping.

[0070] When the offline valve 3 needs to be restored to the working position, the moving component drives the contraction component to move in the horizontal direction to achieve the passive contraction of the contraction component. The end of the contraction component protruding from the housing 1 retracts into the housing 1, thereby releasing the state where the anti-autoclosing mechanism 2 is erected on the anti-falling crossbeam 34. The valve stem 32 will automatically fall, and the anti-autoclosing mechanism 2 follows the valve stem 32 to fall, and the offline valve 3 automatically resets.

[0071] The above technical solution adds a contraction component to the anti-autoclosing mechanism 2, enabling the anti-autoclosing mechanism 2 to achieve passive contraction and active reset functions during the rising process. The anti-autoclosing mechanism 2 can be fixed above the anti-falling crossbeam 34 without manual intervention. At the same time, a moving component is added to achieve the active retraction of the contraction mechanism during the descent of the anti-autoclosing mechanism 2. The automatic contraction and descent action of the anti-autoclosing mechanism 2 can be realized without manual intervention, solving the problem that the offline valve 3 is likely to fall when powered off and eliminating the need for manual disassembly and assembly, realizing the automatic anti-autoclosing function of the offline valve 3, thereby reducing the probability of safety accidents.

[0072] In some embodiments, the contraction component includes two pawls 211, two placement cavities 212, and two first elastic components; the two sides of the housing 1 are provided with pawls 211, the first elastic components are arranged in the placement cavities 212, one end of the first elastic component is connected to the moving component, the other end of the first elastic component is connected to one end of the pawl 211, the pawl 211 is hinged in the placement cavity 212, and the other end of the pawl 211 protrudes from the housing 1; when the pawl 211 contacts the anti-falling crossbeam 34, the first elastic component contracts, and when the pawl 211 is erected on the anti-falling crossbeam 34, the first elastic component returns to its original state.

[0073] Please refer to Figure 5, the pawl 211 is preferably a metal block in the shape of a column, for example, it can be a square column. The placement cavity 212 is a cavity for accommodating the contraction assembly. The placement cavities 212 are arranged on both sides inside the housing 1. Specifically, the placement cavities 212 are arranged on the moving assembly. The number of the placement cavities 212 corresponds to the number of the pawls 211. A pin hole is provided in the middle of the pawl 211 and is hinged in the placement cavity 212 through a pin. One end of the pawl 211 is connected to the first elastic member 213, and the other end of the pawl 211 protrudes out of the placement cavity 212 and extends to the outside of the housing 1. Optionally, the end of the pawl 211 protruding out of the housing 1 can be rounded to facilitate the contraction guidance of the pawl 211. The shape of the placement cavity 212 is set according to the actual use requirements. For example, in some preferred embodiments, the shape of the placement cavity 212 is as Figure 5 shown, and the pawl 211 can rotate in the up and down directions relative to the placement cavity 212, and its rotation range is limited by the shape of the placement cavity 212.

[0074] Through the cooperation of the pawl 211 with the first elastic assembly and the accommodating cavity, the requirement that the offline valve 3 automatically abuts against the anti-falling cross beam 34 after passing through the anti-falling cross beam 34 when the valve stem 32 rises is realized, and there is no need for manual installation of the anti-falling cross beam 34, which is convenient for maintenance.

[0075] As a preferred embodiment, as Figure 5 shown, the first elastic assembly includes a first elastic member 213 and a guiding member 215; one end of the first elastic member 213 is connected to the moving assembly, and the other end of the first elastic member 213 is connected to the guiding member 215; one end of the guiding member 215 extends into the first elastic member 213, and the other end of the guiding member 215 is connected to one end of the pawl 211, and the guiding member 215 is used to guide the first elastic member 213.

[0076] The first elastic assembly can directly include the first elastic member 213. One end of the first elastic member 213 is connected to the moving assembly, and the other end of the first elastic member 213 is connected to the pawl 211. The first elastic member 213 has elasticity, can elastically contract when subjected to pressure, and can restore its initial shape when the pressure disappears. The first elastic member 213 can be made of metal elastic materials such as metal springs, or can also be made of non-metal elastic materials such as rubber and silica gel. In some preferred embodiments, the first elastic member 213 is made of a metal elastic material, for example, a metal spring.

[0077] Optionally, the guiding member includes a telescopic rod. The telescopic rod is sleeved on the first elastic member 213. One end of the telescopic rod is fixedly connected to the moving assembly, and the other end of the telescopic rod is fixedly connected to one end of the pawl 211. The telescopic rod can perform axial telescopic movement. The telescopic rod is used to support the first elastic member 213 to prevent the first elastic member 213 from bending radially during the compression process and even coming out of the accommodating cavity, which affects the actual use effect.

[0078] As Figure 5 shown in the figure, as a preferred embodiment, the guide member 215 further includes a flat plate and a spherical protrusion. The spherical protrusion can penetrate into the interior of the first elastic member 213. When the first elastic member 213 is compressed to the extreme point, the spherical protrusion just abuts against the moving component, preventing the first elastic member 213 from disengaging from between the moving component and the guide member 215. In some other preferred embodiments, the shape of the guide member 215 can also be a column with a telescopic structure. One end of the guide member 215 can be fixed to the moving component, and the other end of the guide member 215 is fixed to the pawl 211. A first elastic member 213 is sleeved outside the guide member 215, and the guide member 215 can perform telescopic movements along with the first elastic member 213. The guide member 215 can support the first elastic member 213, preventing the first elastic member 213 from generating radial deformation after compression and thus avoiding the problem of disengaging from the moving component.

[0079] The specific working principle of the contraction component is as follows: After the pawl 211 contacts the anti-falling cross beam 34, it is subject to a downward binding force. The end of the pawl 211 protruding from the housing 1 moves downward. According to the lever principle, the other end of the pawl 211 compresses the first elastic member 213 and moves upward until the pawl 211 is no longer subject to the downward binding force. At this time, the pawl 211 is in a contracted state, and the end of the pawl 211 protruding from the housing 1 abuts against the side wall of the anti-falling cross beam 34 and is in force balance. The contraction component is in a contracted state and moves upward under the drive of the valve stem 32. When the pawl 211 passes through the anti-falling cross beam 34, the pawl 211 has no contact with the anti-falling cross beam 34. The pawl 211 returns to the horizontal position under the action of the first elastic member 213, and the end of the pawl 211 protruding from the housing 1 is placed on the anti-falling cross beam 34. At this time, due to the limiting effect of the edge of the accommodation cavity, the pawl 211 will not rotate relative to the anti-falling cross beam 34.

[0080] In some embodiments, the pawl 211 further includes a pawl wheel 214. The pawl wheel 214 is provided at the other end of the pawl 211 and is used to reduce friction when contacting the anti-falling cross beam 34.

[0081] The pawl wheel 214 can adopt an existing roller. Optionally, a roller material with a surface coated with a polymer such as polyethylene can be selected, which helps to protect the outer surface of the anti-falling cross beam 34. The pawl wheel 214 is fixed to the end of the pawl 211 protruding from the housing 1, and the pawl wheel 214 can roll relative to the contact surface of the anti-falling cross beam 34. By providing the pawl wheel 214, the friction between the outer surface of the pawl 211 and the anti-falling cross beam 34 can be reduced, the wear of the pawl 211 during use can be decreased, the service life of the pawl 211 can be extended, and at the same time, it also helps to protect the outer surface of the anti-falling cross beam 34, reduce the wear of the anti-falling cross beam 34, and extend the service life of the anti-falling cross beam 34.

[0082] In some embodiments, the moving component includes a driving unit 221, a gear 222, two racks 223, and two second elastic members 224; racks 223 are arranged at the upper and lower ends of the gear 222 and are engaged therewith. One end of the second elastic member 224 is connected to the inner side of the housing 1, and the other end of the second elastic member 224 is connected to the rack 223. The moving directions of the two racks 223 are opposite; the rack 223 is connected to the contraction component, and the driving unit 221 is connected to the gear 222. The driving unit 221 is configured to drive the gear 222 to rotate so as to contract the contraction component, and the second elastic member 224 is configured to reset the contraction component.

[0083] Please refer to Figures 3 to 6 , the driving unit 221 is arranged outside the housing 1, which can save the internal space of the housing 1. The driving unit 221 may be a motor for driving the gear 222 to perform a rotational motion. Two racks 223 are arranged at the upper and lower ends of the gear 222, and the gear 222 drives the rack 223 to perform a horizontal motion in a meshing manner.

[0084] The rack 223 is in an L shape and includes a first rack and a second rack. As Figure 4 shown, among them, the rack 223 engaged with the upper end of the gear 222 is the first rack, and the rack 223 engaged with the lower end of the gear 222 is the second rack. When the gear 222 rotates, the moving directions of the first rack and the second rack are opposite, that is, when the first rack moves to the right, the second rack moves to the left. As Figure 5 shown, one end of the rack 223 is connected to the second elastic member 224, and the other end of the rack 223 communicates with the placement cavity 212, and a pawl 211 is hinged in the accommodation cavity. The rack 223 can drive the pawl 211 to perform a horizontal motion. The other end of the second elastic member 224 is fixedly connected to the housing 1. When the second elastic member 224 is in a natural extended state, the rack 223 abuts against the side wall of the housing 1, and the pawl 211 is in a state of protruding from the housing 1. When the second elastic member 224 is in a compressed state, the rack 223 is away from the side wall of the housing 1, and the pawl 211 is in a horizontally contracted state.

[0085] The second elastic member 224 has elasticity, can elastically contract when subjected to pressure, and can recover its initial shape when the pressure disappears. The second elastic member 224 can be made of a metal elastic material such as a metal spring, or can also be made of a non-metal elastic material such as rubber or silica gel. In some preferred embodiments, the second elastic member 224 is made of a metal elastic material, for example, a metal spring. A telescopic rod can be added inside the second elastic member 224. One end of the telescopic rod is fixedly connected to the moving assembly, and the other end of the telescopic rod is fixedly connected to one end of the pawl 211. The telescopic rod can perform axial telescopic movement. The telescopic rod is used to support the second elastic member 224 to prevent the second elastic member 224 from bending radially during compression or even coming out of the accommodating cavity, which affects the actual use effect.

[0086] By setting the second elastic member 224 and the meshing form of the gear 222 and the rack 223, the rotational motion of the driving unit 221 is converted into a horizontal motion, realizing the horizontal movement of the moving assembly, and further driving the pawl 211 to perform a horizontal contraction action, thereby obtaining the anti-self-closing release state of the off-line valve 3.

[0087] In some embodiments, the moving assembly further includes at least two guide wheels 225. The guide wheels 225 are arranged in the same horizontal direction; a guide groove 226 is formed in the rack 223, and the guide wheels 225 are fixed in the guide groove 226. The guide wheels 225 are used to move the rack 223 along the horizontal direction.

[0088] Please refer to Figure 5 , the guide wheels 225 are fixed in the housing 1. The roller part of the guide wheels 225 contacts the rack 223, which is used to support the rack 223 and enable the rack 223 to move more smoothly in the horizontal direction relative to the housing 1. In some preferred embodiments, a guide groove 226 is formed in the rack 223 in the horizontal direction, and the guide wheels 225 are sleeved inside the rack 223 through the guide groove 226, facilitating the movement of the rack 223 relative to the guide wheels 225. Optionally, the number of the guide wheels 225 is more than two. For example, the number of the guide wheels 225 is three. And, the positions of the guide wheels 225 and the guide groove 226 can be adjusted in the length direction according to actual use, so that the cooperation between the guide wheels 225 and the guide groove 226 can realize the movement limit of the rack 223 in the horizontal direction.

[0089] By setting the guide wheels 225, the rack 223 can be supported and the friction of the horizontal movement of the rack 223 can be reduced, improving the service life of the rack 223.

[0090] In some embodiments, as Figure 4 shown, the moving assembly further includes at least one limiting wheel 229. The limiting wheel 229 is fixed in the guide groove 226, and the limiting wheel 229 is used to limit the movement of the rack 223.

[0091] The limiting wheel 229 can be arranged at the leftmost or rightmost end of the guiding groove 226. Optionally, there are two limiting wheels 229, which are arranged at the leftmost and rightmost ends of the guiding groove 226 respectively. Taking the moving direction of the second rack as an example, when the second rack moves to the leftmost side, the guiding groove 226 contacts and limits with the rightmost limiting wheel 229, the second elastic member 224 is compressed to the limit position, and the pawl 211 retracts into the interior of the housing 1. When the second rack moves to the rightmost side, the guiding groove 226 contacts and limits with the leftmost limiting wheel 229, the second elastic member 224 returns to its original position, and the pawl 211 protrudes from the housing 1 and is at the maximum protruding limit position.

[0092] Through the cooperation of the limiting wheel 229 and the guiding groove 226, the horizontal limitation of the rack 223 is realized, avoiding the frequent impact of the rack 223 on the housing 1, thereby prolonging the service life of the entire anti-autoclosing mechanism 2.

[0093] In some embodiments, the moving assembly further includes a limiting strip 227. The limiting strip 227 is arranged on the side of the second elastic member 224 away from the housing 1, and the limiting strip 227 is used to prevent the second elastic member 224 from bending radially.

[0094] The limiting strip 227 is arranged on the side of the second elastic member 224 away from the side wall of the housing 1. On the other side, by modifying the shape of the external housing 1, the housing 1 can be used as the limiting component on the other side of the second elastic member 224, saving costs. By arranging the limiting strip 227, the second elastic member 224 can be prevented from disengaging from the moving assembly, prolonging the service life of the second elastic member 224 and increasing the firmness of the moving assembly. As a most preferred embodiment, please refer to Figure 5 , the limiting strip 227 is arranged on both sides of the second elastic member 224. The limiting strip 227 can be a cylinder or a flat plate. When the second elastic member 224 is a spring and there is no support component such as a telescopic rod sleeved inside the second elastic member 224, during use, the second elastic member 224 is prone to radial bending due to compression and even disengaging from the moving assembly. Therefore, the limiting strip 227 is added to limit the radial bending of the second elastic member 224.

[0095] In some embodiments, the housing 1 further includes two receiving members 11, and the receiving members 11 are fixed to the inner side of the housing 1; a convex block 228 is arranged on one side of the rack 223, the convex block 228 protrudes towards the receiving member 11, one end of the second elastic member 224 is connected to the receiving member 11, the other end of the second elastic member 224 is connected to the convex block 228, and the receiving member 11 is used to receive the convex block 228.

[0096] Please refer to Figure 5, the receiving member 11 is connected to the second elastic member 224, and the receiving member 11 is fixed to the housing 1. The bump 228 is provided at the connection between the rack 223 and the second elastic member 224. The radial cross-sectional dimension of the bump 228 is smaller than that of the second elastic member 224, and the bump 228 can extend into the inner side of the second elastic member 224 for a certain distance. When the second elastic member 224 is compressed, the end of the bump 228 can abut against the surface of the receiving member 11. Optionally, the end of the bump 228 can be made into a hemispherical shape to facilitate reducing the impact force when the bump 228 abuts against the surface of the receiving member 11. Optionally, a groove can be formed in the receiving member 11, and the shape of the groove corresponds to that of the bump 228, so that the bump 228 fits better with the receiving member 11, which helps to conduct the kinetic energy generated by the horizontal movement of the bump 228, cause a certain buffering effect on the impact of the rack 223, reduce the vibration generated by the impact of the rack 223, and thus extend the service life of the overall anti-self-closing mechanism 2.

[0097] In some embodiments, the anti-self-closing mechanism 2 further includes a travel switch 23. The travel switch 23 is disposed on the contraction assembly, and the travel switch 23 is electrically connected to the moving assembly. The travel switch 23 is configured to control the moving assembly to move in the horizontal direction according to the state of the contraction assembly to contract or reset the contraction assembly.

[0098] The travel switch 23 can adopt a commercially available standard product, and the travel switch 23 is mainly used as a limit switch. The swing rod of the travel switch 23 can be connected to the pawl 211, and the travel switch 23 emits a signal through the state of the pawl 211. The travel switch 23 is electrically connected to the moving assembly. Specifically, the travel switch 23 is electrically connected to the drive unit 221 on the moving assembly through the control end. Its working principle is: the travel switch 23 can detect the state of the contraction assembly and emit a corresponding signal according to the state of the contraction assembly, so that the control end judges the contraction or reset logic according to the signal sent by the travel switch 23, thereby driving the drive unit 221 to drive the gear 222.

[0099] When the off-line valve 3 is opened, when the anti-self-closing mechanism 2 rises with the valve stem 32 through the anti-falling cross beam 34, the swing rod of the travel switch 23 swings downward following the anti-self-closing mechanism 2, realizing a double signal in the open state of the off-line valve 3 (i.e., the signal for opening the cylinder solenoid valve and the travel switch signal).

[0100] When the bag filter needs to be cleaned or repaired offline, the offline valve is closed through a program or manual signal command, and the closing signal is output to the control end. The control end controls the drive unit 221 to be energized, and the drive unit 221 drives the gear 222 to rotate. The rotation of the gear 222 drives the rack 223 to move horizontally to retract the ratchet 211. Another signal is output to the cylinder solenoid valve, and the cylinder solenoid valve switches from open to closed, so that the offline valve 3 is closed downward, and the anti-self-closing mechanism 2 passes through the bracket 33 as the valve stem 32 descends. At this time, the travel switch 23 sends a reset signal to the drive unit, the drive unit 221 is powered off, the gear 222 is not driven by the drive unit 221, and the second elastic member 224 is reset to drive the rack 223 to move horizontally to reset the ratchet 211.

[0101] By setting the travel switch 23, the control end can obtain the state of the contraction component, and then perform logic control according to the state of the contraction component, thereby realizing the release function of the automatic anti-self-closing state of the offline valve 3.

[0102] The above technical solution adds a retracting component to the anti-self-closing mechanism 2, so that the anti-self-closing mechanism 2 can realize the passive contraction and active resetting function during the rising process, and the anti-self-closing mechanism 2 can be fixed above the anti-falling beam 34 without human intervention. At the same time, a moving component is added to realize the active retraction action of the retracting mechanism during the descent of the anti-self-closing mechanism 2, and the automatic contraction and descent action of the anti-self-closing mechanism 2 can be realized without human intervention, which solves the problem that the offline valve 3 is easy to fall due to power failure and does not require manual disassembly and assembly, thereby realizing the automatic anti-self-closing function of the offline valve 3, thereby reducing the probability of safety accidents.

[0103] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An anti-self-closing device for an off-line valve of a bag filter, characterized in that, Comprising: A housing fixed to the valve stem of the off-line valve; An anti-autoclosing mechanism disposed within the housing. The anti-autoclosing mechanism includes a contraction assembly and a moving assembly. The contraction assemblies are provided on both sides of the housing, and one end of the contraction assembly protrudes from the housing; The contraction assembly includes a contracted state and a reset state. When the contraction assembly is in the contracted state, the valve stem rises to the anti-falling crossbeam of the off-line valve, and the contraction assembly contacts the anti-falling crossbeam and contracts. When the contraction assembly is in the reset state, the contraction assembly is mounted on the anti-falling crossbeam; the valve stem drives the anti-autoclosing mechanism within the housing to rise. As the contraction assembly rises with the anti-autoclosing mechanism, the contraction assembly will contact the anti-falling crossbeam, and there will be a structural interference between the contraction assembly and the anti-falling crossbeam. The lower surface of the anti-falling crossbeam gives a downward contact force to the contraction assembly, causing the contraction assembly to contract downward, enabling the anti-autoclosing mechanism to continue moving upward relative to the anti-falling crossbeam until the anti-autoclosing mechanism is completely above the anti-falling crossbeam. At this time, the contraction assembly can automatically reset; at this time, the end of the contraction assembly protruding from the housing abuts against the upper surface of the anti-falling crossbeam, fixing the off-line valve on the anti-falling crossbeam to prevent the off-line valve from falling; The contraction assembly is connected to the moving assembly, and the moving assembly is used to drive the contraction assembly to move horizontally to contract or reset the contraction assembly; When the off-line valve needs to be restored to the working position, the moving assembly drives the contraction assembly to move horizontally to achieve passive contraction of the contraction assembly; the end of the contraction assembly protruding from the housing retracts into the housing interior, thus releasing the state where the anti-autoclosing mechanism is mounted on the anti-falling crossbeam. The valve stem will automatically fall, and the anti-autoclosing mechanism follows the valve stem to fall, and the off-line valve automatically resets.

2. The anti-self-closing device for the offline valve of the bag filter according to claim 1, characterized in that, The contraction assembly includes two pawls, two placement cavities, and two first elastic components; The pawls are provided on both sides of the housing. The first elastic components are disposed within the placement cavities. One end of the first elastic component is connected to the moving assembly, and the other end of the first elastic component is connected to one end of the pawl. The pawl is hinged within the placement cavity, and the other end of the pawl protrudes from the housing; When the pawl contacts the anti-falling crossbeam, the first elastic component contracts. When the pawl is mounted on the anti-falling crossbeam, the first elastic component returns to its original state.

3. The anti-self-closing device for the off-line valve of the bag filter according to claim 2, characterized in that, The first elastic component includes a first elastic member and a guiding member; One end of the first elastic member is connected to the moving assembly, and the other end of the first elastic member is connected to the guiding member; One end of the guiding member extends into the first elastic member, and the other end of the guiding member is connected to one end of the pawl. The guiding member is used to guide the first elastic member.

4. The anti - self - closing device for the offline valve of the bag filter according to claim 2, characterized in that, The pawl further includes a pawl wheel provided on the other end of the pawl. The pawl wheel is used to reduce friction when contacting the anti-falling crossbeam.

5. The anti-self-closing device for the offline valve of the bag filter according to claim 1, characterized in that, The moving assembly includes a driving unit, a gear, two racks, and two second elastic members; The upper and lower ends of the gear are provided with the racks meshing therewith. One end of the second elastic member is connected to the inner side of the housing, and the other end of the second elastic member is connected to the rack. The moving directions of the two racks are opposite. The rack is connected to the contraction assembly, and the driving unit is connected to the gear. The driving unit is used to drive the gear to rotate so as to contract the contraction assembly, and the second elastic member is used to reset the contraction assembly.

6. The anti - self - closing device for the off - line valve of the bag filter according to claim 5, characterized in that, The moving assembly further includes at least two guide wheels which are arranged in the same horizontal direction. A guide groove is formed in the rack, and the guide wheel is fixed in the guide groove. The guide wheel is used to make the rack move along the horizontal direction.

7. The anti-self-closing device for the off-line valve of the bag filter according to claim 6, characterized in that, The moving assembly further includes at least one limiting wheel which is fixed in the guide groove. The limiting wheel is used to limit the movement of the rack.

8. The anti - self - closing device for the offline valve of the bag filter according to claim 5, characterized in that, The moving assembly further includes a limiting strip. The limiting strip is arranged on the side of the second elastic member away from the housing. The limiting strip is used to prevent the second elastic member from bending in the radial direction.

9. The anti - self - closing device for the offline valve of the bag filter according to claim 5, characterized in that, The housing further includes two accommodating members which are fixed to the inner side of the housing. A convex block is arranged on one side of the rack and protrudes towards the accommodating member. One end of the second elastic member is connected to the accommodating member, and the other end of the second elastic member is connected to the convex block. The accommodating member is used to accommodate the convex block.

10. An offline valve, characterized in that, Comprising: A cylinder; A valve rod which is connected to the cylinder; A bracket which is arranged below the cylinder; An anti-falling cross beam which is fixed to the bracket; The anti-closing device for the offline valve of the bag filter as described in any one of claims 1 to 9, and the anti-closing device is fixed to the valve rod.

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