Connecting device and dry gas dedusting system

Abstract

The present disclosure belongs to the technical field of valves, and particularly relates to a connecting device and a coal gas dry dedusting system. The connecting device is used for connecting a piston rod of a pneumatic flap valve and a piston rod of a pneumatic cylinder, and comprises a connecting head and a pressing sleeve. The connecting head is connected to an end of the piston rod, and at least a part of the connecting head is a first annular spherical surface surrounding the piston rod. The pressing sleeve is sleeved on the piston rod and fixedly connected with the flap, and has a second annular spherical surface matched with the first annular spherical surface. The pressing sleeve is pressed against the flap by the second annular spherical surface matched with the first annular spherical surface. Thus, the connecting device can be slightly adjusted in multiple directions by the matched first and second annular spherical surfaces, so as to compensate for the centering error of the piston rod and the flap, and reduce the additional load or wear caused by the installation error.

Description

Technical Field

[0001] This disclosure belongs to the field of valve technology, and specifically relates to a connection device and a dry gas dust removal system. Background Technology

[0002] The closed ferrosilicon manganese submerged arc furnace uses a dry gas dust removal system to purify the furnace gas. After passing through the conveying pipe, the furnace gas enters the dust collector for dust removal and cooling. The dust intercepted by the dust collector is discharged into the dust silo after being opened by a pneumatic flap valve and then transferred periodically. The pneumatic flap valve is powered by compressed air and is controlled by a cylinder to open and close the flap.

[0003] In existing pneumatic flap valves, the flap is directly connected to the piston rod of the cylinder via threads. Because high-temperature dust easily adheres to the wall of the conveying pipe, the flap is subjected to uneven force when it reciprocates with the piston rod, which in turn damages the threads connecting the flap and the piston rod, causing the flap to not close tightly or even fall off. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and to provide a connection device and a dry gas dust removal system.

[0005] In a first aspect, this disclosure provides a connecting device for connecting the flap of a pneumatic flap valve and the piston rod of a cylinder, the connecting device comprising: A connector is attached to the end of the piston rod, and at least a portion of the connector is a first annular spherical surface surrounding the piston rod; A clamping sleeve is fitted onto the piston rod and fixedly connected to the flap plate. The clamping sleeve has a second annular spherical surface that is adapted to the first annular spherical surface. The clamping sleeve presses the connector onto the flap plate by engaging the second annular spherical surface with the first annular spherical surface.

[0006] In one embodiment of this disclosure, the connector is a sphere with a portion of its surface removed from its center around the piston rod axis. The sphere with the portion of its surface removed forms a plane, and the piston rod is connected to the connector via the plane.

[0007] In one embodiment of this disclosure, the flip plate is provided with an installation groove, and an auxiliary connecting seat is fixedly provided in the installation groove. The auxiliary connecting seat has a hemispherical groove that is adapted to and abuts against the connector of the ball.

[0008] In one embodiment of this disclosure, the mating surfaces of the clamping sleeve and the flip plate are pre-positioned by a matching positioning post and positioning groove, wherein one of the positioning post and the positioning groove is disposed on the clamping sleeve and the other is disposed on the flip plate.

[0009] In one embodiment of this disclosure, the positioning pin on the clamping sleeve extends along the axial direction of the piston rod, and the positioning groove on the flip plate and the mounting groove are equal in size and connected along the radial direction of the piston rod.

[0010] In one embodiment of this disclosure, the flap includes: A flap body, the flap body being configured to open or close the channel as the piston rod reciprocates; The flap body extends outward along the central axis to form a connecting part, which is configured to be fixedly connected to the clamping sleeve, and the radial dimension of the connecting part is smaller than the radial dimension of the flap body.

[0011] In one embodiment of this disclosure, the central angle of the second annular spherical surface of the compression sleeve is 30°-40°.

[0012] In one embodiment of this disclosure, the mounting groove is a circular groove, and the positioning post is an annular positioning post.

[0013] In one embodiment of this disclosure, the clamping sleeve is fixedly connected to the connecting portion by bolts.

[0014] Secondly, this disclosure provides a dry gas dust removal system for purifying the furnace gas of a ferrosilicon manganese submerged arc furnace, the dry gas dust removal system comprising: A dust bin, the dust bin being configured to hold dust and having a hopper; A pneumatic flap valve, wherein the flap of the pneumatic flap valve is configured to reciprocate with the piston rod of the cylinder to open or close the dust passage, so that the dust enters the dust chamber from the opening; A connecting device configured to connect the flap of the pneumatic flap valve and the piston rod of the cylinder, the connecting device being the connecting device as described in any of the preceding embodiments.

[0015] One of the beneficial effects of this disclosure is that the connecting device of this disclosure, by connecting a connector head, at least partially composed of a first annular spherical surface, to the end of the piston rod, and the first annular spherical surface being able to surround the piston rod, increases the stability of the connection; furthermore, a clamping sleeve is fitted on the piston rod, the clamping sleeve having a second annular spherical surface adapted to the first annular spherical surface, thereby pressing the connector head against the flap of the pneumatic flap valve through the two mating annular spherical surfaces, after which the clamping sleeve and the flap can be fixed. Thus, the connecting device of this disclosure can make minor adjustments in multiple directions through the adapted first and second annular spherical surfaces, compensating for the alignment error between the piston rod and the flap, reducing additional load or wear caused by installation errors, and during operation of the pneumatic flap valve, the piston rod and the flap can adapt to displacement caused by vibration or thermal deformation, maintaining transmission stability.

[0016] On the other hand, the gas dry dust removal system disclosed herein connects the flap of the pneumatic flap valve and the piston rod of the cylinder through the connecting device disclosed herein, so as to avoid the connection failure caused by the uneven force exerted by the piston rod on the flap due to dust when the flap moves back and forth with the piston rod for a long time. This maintains the stability of the connection between the piston rod and the flap. Attached Figure Description

[0017] Embodiments of this disclosure are illustrated in conjunction with the accompanying drawings, which are included and form part of this specification, and together with their description serve to explain the principles of this disclosure.

[0018] Figure 1 This is a cross-sectional view of the connection device provided in one embodiment of the present disclosure, which is used to connect the flap of a pneumatic flap valve to the piston rod of a cylinder. Figure 2 This is a front view of the flap of the connecting device provided in an embodiment of the present disclosure; Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along AA; Figure 4 This is a cross-sectional view of the connector head of a connecting device provided in an embodiment of this disclosure; Figure 5 This is a front view of the clamping sleeve of a connecting device provided in an embodiment of the present disclosure; Figure 6 yes Figure 5 Schematic diagram of the structure along the BB section; Figure 7 This is a cross-sectional view of the auxiliary connecting seat of the connecting device provided in one embodiment of the present disclosure.

[0019] Figures 1 to 7 The correspondence between the component names and the reference numerals in the figures is as follows: 1. Flip plate; 11. Mounting slot; 12. Flip plate body; 13. Connecting part; 2. Piston rod; 31 Connector, 311 First annular spherical surface, 32 Clamping sleeve, 321 Second annular spherical surface, 322 Positioning post, 33 Auxiliary connecting seat, 331 Groove. Detailed Implementation

[0020] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0021] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0025] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0026] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0027] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0028] The closed ferrosilicon manganese submerged arc furnace uses a dry gas dust removal system to purify the furnace gas. After passing through the conveying pipe, the furnace gas enters the dust collector for dust removal and cooling. The dust intercepted by the dust collector is discharged into the dust silo after being opened by a pneumatic flap valve and then transferred periodically. The pneumatic flap valve is powered by compressed air and is controlled by a cylinder to open and close the flap.

[0029] In existing pneumatic flap valves, the flap is directly connected to the piston rod of the cylinder via threads. Because high-temperature dust easily adheres to the wall of the conveying pipe, the flap is subjected to uneven force when it reciprocates with the piston rod, which in turn damages the threads connecting the flap and the piston rod, causing the flap to not close tightly or even fall off.

[0030] To this end, this disclosure provides a connecting device for connecting the flap of a pneumatic flap valve and the piston rod of a cylinder. The device includes a connector and a clamping sleeve. The connector is connected to the end of the piston rod, and at least a portion of the connector is a first annular spherical surface surrounding the piston rod. The clamping sleeve is fitted onto the piston rod and fixedly connected to the flap. The clamping sleeve has a second annular spherical surface adapted to the first annular spherical surface. The clamping sleeve clamps the connector onto the flap by engaging the second annular spherical surface with the first annular spherical surface.

[0031] The connecting device disclosed herein connects a connector, at least partially composed of a first annular spherical surface, to the end of a piston rod, with the first annular spherical surface capable of surrounding the piston rod to increase connection stability. Furthermore, a clamping sleeve is fitted onto the piston rod, the clamping sleeve having a second annular spherical surface adapted to the first annular spherical surface. The two mating annular spherical surfaces then press the connector onto the flap of the pneumatic flap valve, after which the clamping sleeve and flap can be fixed. Thus, the connecting device of this disclosure allows for minute adjustments in multiple directions via the adapted first and second annular spherical surfaces, compensating for alignment errors between the piston rod and the flap, reducing additional load or wear caused by installation errors. Moreover, during operation, the piston rod and flap can adaptively adapt to displacement caused by vibration or thermal deformation, maintaining transmission stability.

[0032] For ease of understanding, please refer to the following: Figures 1 to 7 The specific structure and working principle of the connection device and the dry gas dust removal system provided in this disclosure will be described in detail with reference to the embodiments.

[0033] In one embodiment, this disclosure provides a connecting device for connecting the flap 1 of a pneumatic flap valve and the piston rod 2 of a cylinder. The device includes a connector 31 and a clamping sleeve 32. The connector 31 is connected to the end of the piston rod 2, and at least a portion of the connector 31 is a first annular spherical surface 311 surrounding the piston rod 2. The clamping sleeve 32 is sleeved on the piston rod 2 and fixedly connected to the flap 1. The clamping sleeve 32 has a second annular spherical surface 321 adapted to the first annular spherical surface 311. The clamping sleeve 32 clamps the connector 31 onto the flap 1 by engaging the second annular spherical surface 321 with the first annular spherical surface 311.

[0034] In detail, combined Figure 1 At least a portion of the connector 31 of this disclosure is a first annular spherical surface 311 surrounding the piston rod 2, and the clamping sleeve 32 has a second annular spherical surface 321 adapted to the first annular spherical surface 311. Thus, the connector 31 and the clamping sleeve 32 have a larger contact area, which can more evenly distribute the pressure from the external load. Furthermore, the first annular spherical surface 311 surrounding the piston rod 2 prevents deformation or breakage at the connection point 13 between the piston rod 2 and the connector 31 due to localized stress concentration. In addition, when the cylinder is working, the piston rod 2 may experience slight wobble due to installation errors or load offsets; the larger first annular spherical surface 311 provides a wider range of oscillation angles to compensate for these deviations. Further, the clamping sleeve 32 presses the connector 31 tightly onto the flap 1 of the pneumatic flap valve and is fixedly connected to the flap 1, preventing uneven force on the flap 1 due to loosening of the connector 31.

[0035] Thus, the connecting device of this disclosure can make minor adjustments in multiple directions through the matching first annular spherical surface 311 and second annular spherical surface 321 to compensate for the alignment error of the piston rod 2 and the flap 1, reduce the additional load or wear caused by installation errors, and during operation of the pneumatic flap valve, the piston rod 2 and the flap 1 can adapt to the displacement caused by vibration or thermal deformation, and maintain the stability of the transmission.

[0036] See Figure 1 and Figure 4 In one embodiment of this disclosure, the connector 31 is a sphere with a portion of its surface cut off, centered on the axis of the piston rod 2. The cut-off portion of the sphere forms a plane, and the piston rod 2 is connected to the connector 31 via the plane side.

[0037] In detail, installation errors may occur when the flap 1 is connected to the piston rod 2. The connector 31 is designed as a sphere with a portion of its surface cut off, centered on the axis of the piston rod 2. In this way, the spherical structure of the connector 31 can compensate for the small angular deviations when the flap 1 moves, avoid the lateral force generated by the direct rigid connection between the cylinder piston rod 2 and the flap 1, prevent the piston rod 2 from bending or the flap 1 from jamming. Furthermore, the spherical connector 31 can evenly distribute the thrust and pull of the cylinder piston rod 2 onto the flap 1, avoid local stress concentration, and reduce local wear or deformation.

[0038] Meanwhile, the sphere is partially cut off to form a flat surface. The piston rod 2 is connected to the connector 31 through the flat side, forming a larger contact area with the end of the piston rod 2, which enhances the reliability of the connection and avoids power loss or offset caused by uneven connection surface. In addition, the flat surface provides a clear installation reference surface, which can be quickly aligned with the connection surface of the piston rod 2 without repeated angle adjustments, thus improving assembly efficiency.

[0039] In one embodiment, the connector 31 of this disclosure has an internally threaded hole on its planar side, and the end of the piston rod 2 has an external thread, and the connector 31 is connected to the end of the piston rod 2 by the thread; or, in one embodiment, the connector 31 is welded to the end of the piston rod 2 by its planar surface. This disclosure does not impose any limitations.

[0040] See Figure 2 and Figure 3 In one embodiment of this disclosure, the flap 1 is provided with an installation groove 11, and an auxiliary connecting seat 33 is fixedly provided in the installation groove 11. The auxiliary connecting seat 33 has a hemispherical groove 331 that is adapted to and abuts against the connector 31 of the ball.

[0041] In detail, the mounting groove 11 can restrict the connector 31 to a preset position to prevent misalignment during assembly, ensure the alignment of the axes of the connector 31, piston rod 2 and flip plate 1, eliminate the need for manual visual alignment, reduce uneven force on the ball head caused by installation position deviation, avoid subsequent jamming of flip plate 1 or wear of cylinder piston rod 2, and prevent long-term vibration from causing the connector 31 to loosen.

[0042] Furthermore, combined Figure 7 An auxiliary connecting seat 33 is fixedly provided in the mounting groove 11. The auxiliary connecting seat 33 has a hemispherical groove 331 that is adapted to and abuts against the connecting head 31 of the ball. The auxiliary connecting seat 33 can be an integral structure with the flip plate 1, or, in order to facilitate the processing of the groove 331, the auxiliary connecting seat 33 can be an independent part that is adapted to the shape of the mounting groove 11 and is interference-fitted with the mounting groove 11.

[0043] In this way, the connector 31 can cooperate with the auxiliary connector 33, retaining its necessary angle compensation function. Compared with point or line contact, the spherical contact between the two can disperse the load and distribute the force evenly to the groove 331. It can withstand radial, axial and moment loads, and make small adjustments in multiple directions to compensate for the error caused by the alignment of the axis, reduce stress concentration, and extend the service life of the parts. The spherical contact between the connector 31 and the auxiliary connector 33 can easily form a lubricating film, reduce direct metal friction, and prevent external dust from entering.

[0044] See Figure 1 and Figure 6 In one embodiment of this disclosure, the mating surfaces of the clamping sleeve 32 and the flip plate 1 are pre-positioned by a matching positioning post 322 and a positioning groove, one of which is disposed on the clamping sleeve 32 and the other is disposed on the flip plate 1.

[0045] In detail, the clamping sleeve 32 of this disclosure is further provided with a matching positioning post 322 and positioning groove between the flap 1 and the clamping sleeve 32, which directly limits the installation position of the connector 31 on the flap 1. It does not require manual visual alignment, and avoids the connection axis of the connector 31, piston rod 2 and flap 1 not coinciding due to positional offset during assembly. This prevents the flap 1 from jamming and uneven force distribution, limits the radial or axial movement of the connector 31, adapts to the impact problem caused by frequent start and stop of the pneumatic flap valve, and reduces abnormal wear on the spherical surface of the connector 31, the wall of the groove 331 and the end of the piston rod 2.

[0046] Furthermore, one of the positioning post 322 and the positioning groove is disposed on the clamping sleeve 32, and the other is disposed on the flap 1. This disclosure does not impose any limitations. In one embodiment, the flap 1 is provided with an annular positioning post 322, and the clamping sleeve 32 is provided with a corresponding positioning groove around the second annular spherical surface 321. When the clamping sleeve 32 presses the connector 31 onto the flap 1, the positioning post 322 on the flap 1 is inserted into the positioning groove of the clamping sleeve 32, thereby pre-positioning and restricting the relative movement between the clamping sleeve 32 and the flap 1.

[0047] See Figure 1 In one embodiment of this disclosure, the positioning pin 322 on the clamping sleeve 32 extends along the axial direction of the piston rod 2, and the positioning groove on the flap 1 and the mounting groove 11 are equal in size and connected along the radial direction of the piston rod 2.

[0048] In detail, combined Figure 6 The positioning post 322 extends along the axis of the piston rod 2 and is set around the second annular spherical surface 321. It will not protrude laterally and block the movement path of the piston rod 2 or the connector 31. The thrust or pull of the cylinder is transmitted to the connector 31 along the same axis through the piston rod 2, and then to the flap 1. This avoids the lateral component force caused by the directional deviation of the positioning post 322. The positioning post 322 extending along the axis of the piston rod 2 can directly limit the axial movement of the connector 31. Furthermore, no additional angle adjustment is required during assembly. It can be quickly installed by simply aligning the axis, reducing the time required for manual alignment.

[0049] Meanwhile, the positioning groove on the flap 1 and the mounting groove 11 are equal in size and connected along the radial direction of the piston rod 2. This simplifies the mechanism, saves space on the flap 1, and makes the structure of the connecting device of this disclosure more compact. It eliminates the need to process two independent grooves separately, and can be formed in one process. This avoids the misalignment of the two independent grooves due to processing errors, ensures the overall accuracy of the grooves, and reduces the amount of adjustment work during subsequent assembly.

[0050] Furthermore, combined Figure 5 The clamping sleeve 32 is fitted onto the piston rod 2 through the central hole. There is a gap between the central hole and the outer diameter of the piston rod 2, so that friction is avoided when the clamping sleeve 32 is fitted onto the piston rod 2. Furthermore, one side of the central hole is connected to the second annular spherical surface 321, and the opening on the other side is chamfered, which can guide the piston rod 2 into the central hole and avoid sharp edges from hindering movement or causing damage.

[0051] See Figure 2 and Figure 3In one embodiment, the flap 1 of this disclosure includes a flap body 12, which is configured to open or close the channel as the piston rod 2 reciprocates; the flap body 12 extends outward along the central axis to form a connecting portion 13, which is configured to be fixedly connected to the clamping sleeve 32, and the radial dimension of the connecting portion 13 is smaller than the radial dimension of the flap body 12.

[0052] In detail, the connecting part 13 extends along the central axis of the flap 1 and is perpendicular to the surface of the flap body 12. The shape of the connecting part 13 is adapted to the shape of the clamping sleeve 32. Furthermore, the inner side of the connecting part 13 forms an installation groove 11 and a positioning groove, which simplifies the overall structure and can better resist pneumatic impact and vibration. In addition, the flap body 12 is relatively thin. Directly opening the installation groove 11 is prone to stress concentration and cracking around it. If the flap body 12 is thickened, the flap body 12 will be too heavy, and the piston rod 2 will consume more energy when driving the flap body 12 to reciprocate. This will prevent the flap 1 from jamming or automatically sagging due to the shift of the center of gravity when it flips. Moreover, the connecting device will be subjected to greater local stress, which is prone to cracking or damage. Thus, the protruding connecting part 13 is equivalent to increasing the wall thickness of the connection between the connector 31 and the flap 1, which can evenly distribute the thrust or pull force transmitted by the piston rod 2 onto the flap 1.

[0053] Furthermore, the radial dimension of the connecting part 13 is smaller than the radial dimension of the flap body 12 to avoid the connecting part 13 being too large and colliding with other structures, causing the flap 1 to jam and fail to reach its position. In addition, the fact that the radial dimension of the connecting part 13 is smaller than that of the flap 1 can avoid damaging the edge contour and material distribution of the flap 1, reducing the overall weight of the flap 1. When the cylinder pushes the flap 1, it does not need to overcome excessive gravity, which can improve the response speed of the flap 1 and reduce the load loss of the cylinder.

[0054] See Figure 6 In one embodiment of this disclosure, the central angle of the second annular spherical surface 321 of the clamping sleeve 32 is 30°-40°.

[0055] Thus, the central angle of the second annular spherical surface 321 of the clamping sleeve 32 of this disclosure is 30°-40°, ensuring that the second annular spherical surface 321 and the first annular spherical surface 311 of the connecting part 13 form effective contact, avoiding component wear caused by local stress concentration, and reserving a reasonable assembly deviation space, so that even if there is a slight coaxiality error in the mating parts, the clamping force can be uniformly transmitted through adaptive adjustment of the spherical surface.

[0056] If the central angle is less than 30°, the spherical contact area is too small, which will lead to excessively high contact stress per unit area and shorten the service life of the clamping sleeve 32 and the connector 31. If the central angle is greater than 40°, the curvature of the spherical surface is too gentle, which will reduce the adaptive adjustment capability and may cause uneven distribution of clamping force due to slight offset during assembly, affecting the overall locking effect.

[0057] See Figure 2 and Figure 5 In one embodiment of this disclosure, the mounting groove 11 is a circular groove, and the positioning post 322 is a positioning post.

[0058] Thus, the mounting groove 11 on the flap 1 of this disclosure is a circular groove. As such, the circular groove has no sharp edges or corners, and the force will be evenly distributed on the circumference of the entire groove when it is subjected to force. If a square or polygonal groove is opened, stress concentration is likely to occur at its edges and corners, which may cause cracks or breakage under long-term use of the pneumatic flap valve. In addition, the circular groove is more compatible with the spherical connector 31, and there is no need for precise alignment during installation, making operation more convenient and less prone to the accumulation of dust and impurities.

[0059] Meanwhile, the positioning post 322 of this disclosure is a positioning post. In this way, the annular positioning post 322 can surround the spherical connector 31 to form a complete enclosure, providing more reliable radial constraint, and cooperate with the circular mounting groove 11. While constraining, the positioning post will not destroy the important role of the spherical connector 31 in multi-directional adjustment and alignment. When under force, the inner circumference of the positioning post will evenly distribute the force transmitted from the spherical connector 31, avoiding deformation or damage caused by local stress concentration. If the connector 31 has slight rotation or friction, the wear of the annular contact surface on the spherical surface will be more uniform, and there will be no problem of excessive wear at a single contact point.

[0060] See Figure 1 In one embodiment of this disclosure, the clamping sleeve 32 is fixedly connected to the connecting portion 13 by bolts.

[0061] In this way, the bolt generates a clear clamping force through the pre-tightening force, which can firmly fix the clamping sleeve 32 and the flap 1 to form a rigid connection, thereby preventing the connector 31 and the piston rod 2 from loosening. It can effectively resist the impact and vibration of the pneumatic flap valve starting and stopping frequently. In addition, it is easy to install and disassemble, reducing spare parts and maintenance costs.

[0062] This disclosure also provides a dry gas dust removal system for purifying the furnace gas of a ferrosilicon manganese submerged arc furnace. The dry gas dust removal system includes a dust bin, a pneumatic flap valve, and a connecting device. The dust bin is configured to hold dust and has a bin opening. The flap 1 of the pneumatic flap valve is configured to reciprocate with the piston rod 2 of the cylinder to open or close the dust passage, allowing dust to enter the dust bin from the bin opening. The connecting device is configured to connect the flap 1 of the pneumatic flap valve and the piston rod 2 of the cylinder. The connecting device is the connecting device shown in any of the above embodiments.

[0063] In detail, once a ferrosilicon manganese submerged arc furnace is started, it needs to run continuously for several months or more. Mid-cycle shutdowns can lead to furnace charge solidification, electrode damage, and extremely high restart costs. The smelting process generates a large amount of dust-laden flue gas (containing MnO and SiO2 dust), requiring a high-efficiency dust removal system. Dry gas dust removal is a purification technology that uses solid filter media (such as filter bags and filter cartridges) to directly separate dust from the furnace gas. Its core advantages are that it requires no water, produces no wastewater discharge, and can recover dry dust, making it suitable for industrial scenarios with high environmental protection requirements, water scarcity, or the need for dust recovery.

[0064] During dust removal, the flue gas containing dust enters the dust collector. As it passes through the filter media, the dust is intercepted by the fibers or the already attached dust layer on the surface of the filter media, achieving gas-dust separation. Clean gas is discharged from the inside of the filter media. As more dust adheres, the resistance of the filter media increases. The high-pressure airflow impacts the filter media in the opposite direction, shaking the surface dust to the bottom. At this time, the flap 1 of the pneumatic flap valve moves with the piston rod 2 of the cylinder to open the dust channel. The fallen dust enters the dust hopper through the channel and is then periodically transferred.

[0065] Thus, the connecting device of this disclosure connects the flap 1 of the pneumatic flap valve and the piston rod 2 of the cylinder, avoiding the connection failure caused by the uneven force exerted by the piston rod 2 on the flap 1 due to dust during long-term reciprocating motion of the flap 1, thus maintaining the stability of the connection between the piston rod 2 and the flap 1.

[0066] The working principle of the connection device provided in this disclosure will be further explained next using an application scenario.

[0067] First, the clamping sleeve 32 of this disclosure is sleeved on the piston rod 2 of the cylinder through the central hole, with the second annular spherical surface 321 on the clamping sleeve 32 facing the end of the piston rod 2. Then, the spherical connector 31 is connected to the external thread at the end of the piston rod 2 through the internal thread. An auxiliary connector 33 is fixedly installed in the mounting groove 11 inside the connecting part 13 on the flap body 12. The connector 31 is then placed in the groove 331 of the auxiliary connector 33. The positioning post 322 protruding on the mating surface of the clamping sleeve 32 and the flap 1 is pre-positioned with the positioning groove formed inside the connecting part 13, so that the second annular spherical surface 321 of the clamping sleeve 32 mates with the first annular spherical surface 311 of the connector 31, and the connector 31 is pressed onto the auxiliary connector 33. Finally, the clamping sleeve 32 and the connecting part 13 are fixedly connected by bolts.

[0068] Thus, the connecting device of this disclosure can make minor adjustments in multiple directions through the matching first annular spherical surface 311 and second annular spherical surface 321 to compensate for the alignment error of the piston rod 2 and the flap 1, reduce the additional load or wear caused by installation errors, and during operation of the pneumatic flap valve, the piston rod 2 and the flap 1 can adapt to the displacement caused by vibration or thermal deformation, and maintain the stability of the transmission.

[0069] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A connecting device for connecting a flap (1) of a pneumatic flap valve and a piston rod (2) of a cylinder, characterized in that, The connecting device includes: Connector (31), which is connected to the end of the piston rod (2), and at least a portion of the connector (31) is a first annular spherical surface (311) surrounding the piston rod (2). A clamping sleeve (32) is sleeved on the piston rod (2) and fixedly connected to the flap (1). The clamping sleeve (32) has a second annular spherical surface (321) that is adapted to the first annular spherical surface (311). The clamping sleeve (32) presses the connector (31) onto the flap (1) through the cooperation of the second annular spherical surface (321) and the first annular spherical surface (311).

2. The connecting device according to claim 1, characterized in that, The connector (31) is a sphere with a portion of its surface cut off, centered on the axis of the piston rod (2). The cut-off portion of the sphere forms a plane, and the piston rod (2) is connected to the connector (31) through the plane.

3. The connecting device according to claim 2, characterized in that, The flap (1) is provided with an installation groove (11), and an auxiliary connecting seat (33) is fixedly provided in the installation groove (11). The auxiliary connecting seat (33) has a hemispherical groove (331) that is adapted to and abuts against the connector (31) of the ball.

4. The connecting device according to claim 3, characterized in that, The mating surfaces of the clamping sleeve (32) and the flap (1) are pre-positioned by a matching positioning post (322) and a positioning groove. One of the positioning post (322) and the positioning groove is set on the clamping sleeve (32), and the other is set on the flap (1).

5. The connecting device according to claim 4, characterized in that, The positioning pin (322) on the clamping sleeve (32) extends along the axial direction of the piston rod (2), and the positioning groove on the flap (1) and the mounting groove (11) are equal in size and connected along the radial direction of the piston rod (2).

6. The connecting device according to any one of claims 1 to 5, characterized in that, The flap (1) includes: The flap body (12) is configured to open or close the channel as the piston rod (2) reciprocates. The flap body (12) extends outward along the central axis to form a connecting part (13), the connecting part (13) is configured to be fixedly connected to the clamping sleeve (32), and the radial dimension of the connecting part (13) is smaller than the radial dimension of the flap body (12).

7. The connecting device according to claim 6, characterized in that, The central angle of the second annular spherical surface (321) of the clamping sleeve (32) is 30°-40°.

8. The connecting device according to claim 5, characterized in that, The mounting groove (11) is a circular groove, and the positioning post (322) is an annular positioning post.

9. The connecting device according to claim 6, characterized in that, The clamping sleeve (32) is fixedly connected to the connecting part (13) by bolts.

10. A dry gas dust removal system for purifying furnace gas from a ferrosilicon manganese submerged arc furnace, characterized in that, The dry gas dust removal system includes: A dust bin, the dust bin being configured to hold dust and having a bin opening; A pneumatic flap valve, wherein the flap (1) of the pneumatic flap valve is configured to reciprocate with the piston rod (2) of the cylinder to open or close the dust passage, so that the dust enters the dust chamber from the opening; A connecting device configured to connect the flap (1) of the pneumatic flap valve and the piston rod (2) of the cylinder, the connecting device being the connecting device according to any one of claims 1 to 9.

Images