Long filter bag combined keel for cloth bag dust collector

Abstract

The utility model discloses a long filter bag combined keel for cloth bag dust collector, include: sectional keel module, self -locking type connecting mechanism and quick -wearing fixed clamping seat, sectional keel module includes upper keel, at least one middle keel and lower keel, self -locking type connecting mechanism is located at the connecting place of two sectional keel modules, including mutually matched outer taper surface and inner taper surface, the outer taper surface is located the rear end of preceding sectional keel module, the inner taper surface is located the front end of following sectional keel module, the outer surface of outer taper surface is provided with at least two spring pins, the inner surface of inner taper surface is provided with the L type clamping groove with spring pin cooperation. The device is convenient to assemble and disassemble, anti-vibration, strengthens the middle support.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial dust removal equipment, specifically to a long filter bag combined keel for a bag filter dust collector. Background Technology

[0002] Baghouse dust collectors, as a highly efficient and mature flue gas dust purification device, are widely used in industrial fields such as power, metallurgy, building materials, and chemicals. Their core filtration element is the filter bag, which typically requires a supporting frame (commonly known as a "frame" or "bag cage") inside to maintain its shape, prevent it from collapsing or excessively deforming during negative pressure or dust removal, thus ensuring filtration efficiency and extending its service life.

[0003] With increasingly stringent environmental protection requirements and the development of large-scale industrial equipment, the air volume handled by baghouse dust collectors is constantly increasing, and the size of individual dust collection chambers is also expanding accordingly. To adapt to this trend towards larger sizes and to increase the filtration area of ​​a single chamber while reducing equipment footprint and cost, the use of long filter bags (typically exceeding 6 meters in length, even reaching 8, 10 meters, or longer) is becoming increasingly common. However, the existing technologies for supporting long filter bags and their fixing methods have the following significant drawbacks and limitations: 1. The manufacturing and transportation of integral keels are challenging. Extra-long integral keels (usually welded from steel wire) place extremely high demands on manufacturing equipment (such as welding machine stroke and straightening equipment length). Lengths exceeding the processing capabilities of conventional equipment significantly increase manufacturing difficulty and reduce yield. Furthermore, extra-long integral keels occupy a huge amount of space during transportation, resulting in high transportation costs. More importantly, due to their excessively high length-to-diameter ratio, they are highly susceptible to permanent deformation such as bending and twisting during transportation and handling, rendering them unusable on-site or requiring significant manpower and resources for correction, or even rendering them unusable.

[0004] 2. The on-site installation and maintenance of the integrated keel system is inconvenient. Within the limited space inside the dust collector (especially in the top tube sheet area), operators need to precisely and vertically insert rigid keels several meters or even tens of meters long into the filter bags and through the tube sheet holes. This operation is extremely cumbersome and difficult, requiring multiple people or the assistance of large auxiliary equipment. Installing and replacing long filter bags and keels usually involves working at heights, and the weight and volume of the extra-long keels further increase the labor intensity of operators and the safety risks of falls and impacts. When a single filter bag is damaged and needs replacement, the matching integrated keel must be pulled out and installed along with it. This is not only cumbersome and time-consuming, but also increases unnecessary maintenance costs (the keel itself may not be damaged).

[0005] 3. Poor support and susceptibility to damage of long filter bags. For extra-long filter bags, although traditional integral keels are fixed at both ends (bag opening and bottom), the middle section lacks effective radial support points. Under the alternating action of filtration (negative pressure) and dust removal (pulse jet cleaning), the middle section of the filter bag is prone to large-scale swinging ("whiplash effect") or collapse and wrinkling. Excessive swinging and collapse in the middle section of the filter bag causes the filter bag fibers to bear repeated bending stress and friction at the support rings (circular rings or longitudinal rib connection points on the keel), which easily leads to fatigue damage (cracking) or mechanical wear (wear through) in this area. This is one of the main reasons for premature failure of long filter bags. Insufficient support in the middle section causes filter bag deformation or collapse, which hinders the smooth penetration and uniform diffusion of the dust removal pulse airflow, resulting in ineffective dust removal in local areas (bag clogging), increasing operating resistance and reducing dust removal efficiency.

[0006] 4. Problems with the connection and fixing of existing segmented keel systems. Although some segmented keel concepts or simple practices exist in the market, their connection reliability and sealing are often insufficient. Connection points may loosen or detach during operation, causing the filter bags to lose support or protrude and puncture the filter bags. Alignment accuracy between segments is difficult to guarantee, resulting in poor overall straightness after connection, affecting the tension and verticality of the filter bags, and exacerbating filter bag swaying and wear. There is a lack of efficient, reliable, and easy-to-operate segmented fixing devices. Existing fixing methods (such as simple threaded connections, snap-fits, etc.) are either structurally complex and inconvenient to install and disassemble, or lack sufficient strength and are prone to failure, or cannot effectively transmit vibration energy during dust removal, making it difficult to meet the requirements of long-term stable operation.

[0007] The core problems of existing technologies can be summarized as follows: Traditional integral keel systems cannot effectively solve the manufacturing, transportation, and installation challenges posed by ultra-long filter bags, and provide insufficient support for the middle section of the filter bag, directly leading to filter bag damage, shortened lifespan, difficult maintenance, and increased operating costs. Existing segmented keel solutions generally suffer from unreliable connections, poor alignment accuracy, and imperfect fixing devices. Therefore, there is an urgent need to develop a segmented keel system and its fixing devices that are structurally sound, easy to manufacture and transport, simple and quick to install and maintain, effectively support long filter bags (especially the middle section), have reliable and stable connections, and offer efficient and easy-to-use fixing devices. This would overcome the many shortcomings of existing technologies and meet the pressing needs of long filter bag applications in large baghouse dust collectors. Utility Model Content

[0008] To address the aforementioned problems, this utility model discloses a long filter bag assembly keel for baghouse dust collectors. This device is easy to install and disassemble, vibration-resistant and anti-loosening, and strengthens the mid-section support.

[0009] A long filter bag assembly frame for a bag filter dust collector includes: segmented frame modules, a self-locking connection mechanism, and a quick-release fixing bracket; The segmented keel module includes an upper keel, at least one middle keel, and a lower keel; The self-locking connection mechanism is located at the connection point of two adjacent segmented keel modules; it includes an outer conical surface and an inner conical surface that cooperate with each other. The outer conical surface is located at the rear end of the previous segmented keel module, and the inner conical surface is located at the front end of the next segmented keel module. The outer surface of the outer conical surface is provided with at least two spring pins, and the inner surface of the inner conical surface is provided with an L-shaped groove that cooperates with the spring pins.

[0010] Preferably, the cone angles of both the outer and inner conical surfaces are 15°±1°.

[0011] Preferably, the end of the L-shaped slot is provided with an anti-reverse ramp.

[0012] Preferably, the angle between the anti-retrograde slope and the cross-section of the segmented keel module is 10°.

[0013] Preferably, the quick-install fixing bracket includes a matching perforated plate groove and an elastic locking tongue. The perforated plate groove is welded to the upper surface of the perforated plate, and the elastic locking tongue is installed at the bottom of the flange of the upper keel.

[0014] Preferably, the inner ring of the flower plate slot is provided with a wedge-shaped guide rail.

[0015] Preferably, the inclination angle of the wedge-shaped guide rail is 10°.

[0016] Preferably, the end of the elastic locking tongue is provided with a hook-shaped protrusion that cooperates with the wedge-shaped guide rail.

[0017] Preferably, each of the connecting ends of adjacent segmented keel modules is provided with an integrated support ring, which is fixed to the outside of the longitudinal rib of the keel, and the surface of the integrated support ring is covered with a wear-resistant layer.

[0018] Preferably, the integrated support ring is provided with multiple through holes, which extend outward through the wear-resistant layer.

[0019] Preferably, the through hole is a fan-shaped hole.

[0020] The beneficial effects of this utility model are as follows: 1. Manufacturing and transportation costs are significantly reduced. The traditional extra-long integral keel is optimized into a segmented modular design (single segment ≤ 3 meters), which increases the manufacturing yield rate from 68% to over 98%, reduces the transportation deformation rate from >40% to 0%, and reduces the transportation space occupation by 60%.

[0021] 2. Installation efficiency is significantly improved. With the self-locking connection mechanism (locking by rotating 15°) and quick-release fixing bracket (locking by rotating 30°), the installation time of a single 10-meter keel is reduced from 20 minutes to 3 minutes, reducing high-altitude operation time by 70% and labor input by 67%.

[0022] 3. Filter bag lifespan doubled The integrated support ring (with silicone coating) reduces the swing amplitude of the filter bag in the middle section from >50mm to ≤10mm, the coefficient of friction from 0.35 to 0.18, the average life of the filter bag from 1.2 years to 3.5 years, and the breakage rate in the middle section is reduced by 90%.

[0023] 4. Maintain economic breakthroughs It supports segmented replacement of damaged filter bags, with a 100% keel reuse rate and a 50% reduction in single maintenance costs: replacement time is reduced from 25 minutes to 4 minutes, and production line downtime losses are reduced by 84%.

[0024] 5. Qualitative change in connection reliability The conical self-centering and mechanical interlocking design (spring pin type groove) ensures that the tensile strength of the connection point is >2kN, and the loosening rate is 0% under 5g random vibration (the loosening rate of traditional threaded connections is >30%).

[0025] In summary, this utility model systematically solves the pain points of manufacturing, transportation, installation and maintenance in the application of long filter bags through four innovations: segmented modular design, self-locking connection mechanism, dynamic support reinforcement and quick-installation fixing device. It reduces the overall operation and maintenance cost by more than 60%, provides key technical support for the compact development of large dust collectors, and has significant industrial application value. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 It has a three-section keel structure; Figure 2 An exploded view showing segmented connections; Figure 3 This is a cross-sectional view of the self-locking connection mechanism; Figure 4 Cross-sectional view of the quick-release fixing bracket; Figure 5 is a cross-sectional view of the wedge-shaped guide rail; Figure 6 This is a cross-sectional view of the L-shaped slot and the anti-retrograde slope; In the diagram: 1. Segmented keel module, 101. Upper keel, 101a. Flange, 102. Middle keel, 103. Lower keel, 103a. Hemispherical closed end, 104. Vertical rib, 105. Circumferential support ring. 2. Self-locking connection mechanism, 201a, outer conical surface, 201b, inner conical surface, 202a, L-shaped slot, 202b, spring pin, 202c, anti-backward ramp; 3. Support ring, 301a; silicone layer, 302; through hole; 4. Fixed bracket, 401, plate slot, 402, elastic locking tongue, 401a, wedge-shaped guide rail, 402b, hook-shaped protrusion; 5. Decorative panel. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see the appendix Figure 1-6 This utility model discloses a long filter bag combined keel for a bag dust collector. The combined keel includes a multi-segment keel module 1, a self-locking connecting mechanism 2 for connecting the segmented keels, an integrated support ring 3 for enhancing the connection strength, and a quick-install fixing bracket 4 for quickly fixing and installing the keel.

[0031] The segmented keel module 1 includes an upper keel 101, multiple middle keels 102, and a lower keel 103. Each keel segment is provided with longitudinal ribs 104, which are made of 304 stainless steel and have a diameter of 4mm. Multiple sets of circumferential support rings 105 connected to the longitudinal ribs are provided along the axial direction of the longitudinal ribs. The circumferential support rings 105 are spaced 120mm apart and have a wire diameter of φ3mm.

[0032] The self-locking connection mechanism 2 is located at the segment connection; the support ring 3 is fixed at the connection node of the segment keel; the top of the upper keel 101 is provided with a flange 101a, the diameter of which is 5mm larger than the hole diameter of the tube sheet 5; the end of the upper keel 101 is machined with an outer conical surface 201a, the cone angle being 15°±1°. The middle keel 102 is a standardized unit, with a length of 2-3 meters per segment; the beginning of the middle keel 102 is provided with an inner conical surface 201b, and the end is provided with an outer conical surface 201a; the bottom of the lower keel 103 is a hemispherical closed end 103a, with a surface roughness Ra≤0.8μm.

[0033] The self-locking connection mechanism 2 includes an L-shaped slot 202a and a spring pin 202b. The L-shaped slot 202a is located inside the inner conical surface 201b, with a depth of 3mm and a width of 6mm, and a 10° anti-reverse slope 202c at the end. The spring pin 202b is installed at the root of the outer conical surface 201a, with a pin diameter of 6mm, and a built-in stainless steel disc spring provides a radial preload of 50N.

[0034] The operation of the self-locking connection mechanism 2 is as follows: After the outer conical surface 201a is inserted into the inner conical surface 201b and rotated 15°, the spring pin 202b springs into the horizontal section of the L-shaped slot 202a and locks it in place, eliminating the risk of loosening the connection. The support ring 3 is fixed to the outside of the longitudinal rib 104. The outer diameter of the support ring is 2mm smaller than the inner diameter of the filter bag (e.g., a φ160mm filter bag is fitted with a 158mm support ring). The surface of the support ring is covered with a silicone layer 301a, with a thickness of 1.0mm and a Shore hardness of A60. There are 24 evenly distributed fan-shaped holes 302 on the support ring, with an opening rate of 45%.

[0035] The silicone layer 301a of the support ring 3 reduces the friction coefficient of the filter bag to 0.18, and the fan-shaped holes (302) ensure the penetration rate of the cleaning airflow.

[0036] A quick-release fixing bracket 4 is located on the upper surface of the tube sheet 5. The quick-release fixing bracket 4 includes a tube sheet groove 401 and a resilient locking tongue 402. The tube sheet groove 401 is welded to the upper surface of the tube sheet 5, and its inner ring is provided with a wedge-shaped guide rail 401a with an inclination angle of 10° and a depth of 8mm. The resilient locking tongue 402 is installed at the bottom of the flange 101a, and its end is provided with a hook-shaped protrusion 402b, which is 0.1mm wider than the guide rail.

[0037] The installation process of the quick-install fixing bracket 4 is as follows: align the hook-shaped protrusion 402b with the slot entrance, rotate the upper keel 30°, and the spring plate deforms to generate a pre-tightening force of >20N to achieve vibration-resistant locking.

[0038] Comparative Example 1 (Traditional One-Piece Keel): A 10-meter-long integral welded keel is used. Material: 304 stainless steel, vertical rib diameter is 4mm, and the spacing between circumferential support rings is 120mm.

[0039] Transportation method: Unpackaged and loaded directly onto the vehicle.

[0040] Installation process: Three people work together to hoist the device, insert it into the hole in the perforated plate at a high altitude, and then weld it in place.

[0041] Support structure: No mid-section reinforcement device.

[0042] Comparative Example 2 (existing segmented keel) uses threaded connection segmented keel: Segmentation: 3 segments (3.3 meters / segment), with M12 threads machined at the connecting ends.

[0043] Installation process: Pre-install filter bags on the ground, hoist them in place, and tighten the connecting threads at high altitude.

[0044] Support structure: There is no integrated support ring at the connection.

[0045] The embodiment (this patent solution) employs a segmented keel and fixing device, including: 1. Segmented configuration Upper section keel 101: Length 3.2m (including middle 165mm flange); Mid-section keel 102×2: 3.0m in length / section; Lower section keel 103: Length 0.8m (hemispherical closed end); Longitudinal reinforcement 104: 12 longitudinal ribs with 4mm 304 stainless steel wire, circumferential support rings (105) with a spacing of 120mm.

[0046] 2. Connecting mechanism The upper end is provided with an outer conical surface 201a (cone angle 15°); The middle / lower section has an inner conical surface 201b (including an L-shaped slot 202a) at its first end; Spring pin 202b: 6mm in diameter, preload 50N.

[0047] 3. Support ring Location: at the junction of segments; Parameters: Outer diameter ф158mm (fits 160mm filter bags), covered with 301a silicone layer (1mm thick); Openings: 24 fan-shaped holes (302) (opening ratio 45%).

[0048] 4. Fixed bracket Flower plate slot 401: wedge guide rail 401a (tilt angle β = 10°); Elastic latch 402: Hook-shaped protrusion 402b, width = guide rail width + 0.1mm.

[0049] In this embodiment, the keel segment connection operation procedure is as follows: ① Align the conical surface with the insertion point → ② Rotate 15° until a "click" sound is heard (the spring pin locks into the L-shaped groove) → ③ Repeat to connect to the top section; In this embodiment, the installation process of the fixed card holder is as follows: ① Align the hook-shaped protrusion (402b) with the slot inlet. ② Rotate the upper section horizontally by 30°. ③ The spring deforms to generate a preload force of >20N to lock.

[0050] Effect Comparison Data Table The above data table illustrates: 1. Segmented modular design (example) completely solves the problem of transportation deformation (deformation ≤1mm vs>50mm).

[0051] 2. Self-locking connection + quick-release bracket improves installation efficiency by 85% (3 minutes vs 20 minutes).

[0052] 3. The integrated support ring suppresses filter bag sway by more than 80% (≤10mm vs 55mm), extending service life by 192%. 4. The mechanical interlock design achieves zero loosening rate (no failure after 500 hours of vibration vs 32% loosening after 2 hours).

[0053] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A long filter bag assembly frame for a baghouse dust collector, characterized in that, include: Segmented keel module (1), self-locking connection mechanism (2) and quick-install fixing bracket (4); The segmented keel module (1) includes an upper keel (101), at least one middle keel (102) and a lower keel (103). The self-locking connection mechanism (2) is located at the connection of two adjacent segmented keel modules (1); it includes an outer conical surface (201a) and an inner conical surface (201b) that cooperate with each other. The outer conical surface (201a) is located at the rear end of the previous segmented keel module (1), and the inner conical surface (201b) is located at the front end of the next segmented keel module (1). The outer surface of the outer conical surface (201a) is provided with at least two spring pins (202b), and the inner surface of the inner conical surface (201b) is provided with an L-shaped groove that cooperates with the spring pins (202b).

2. A long filter bag combined keel for a bag-type dust collector according to claim 1, characterized in that, The cone angles of the outer cone surface (201a) and the inner cone surface (201b) are both 15°±1°.

3. A long filter bag combined keel for a bag-type dust collector according to claim 1, characterized in that, The L-shaped slot is provided with an anti-reverse ramp (202c) at its end.

4. The combined keel for long filter bag of bag-type dust collector according to claim 3, characterized in that, The angle between the anti-retrograde slope (202c) and the cross-section of the segmented keel module (1) is 10°.

5. The modular long filter bag for a baghouse according to claim 1, wherein The quick-install fixing bracket (4) includes a matching tube sheet groove (401) and an elastic locking tongue (402). The tube sheet groove (401) is welded to the upper surface of the tube sheet (5), and the elastic locking tongue (402) is installed at the bottom of the flange (101a) of the upper keel (101).

6. A modular runner for long filter bags for baghouses according to claim 5, wherein, The inner ring of the flower plate slot (401) is provided with a wedge-shaped guide rail (401a).

7. A modular runner for long filter bags of a baghouse according to claim 6, characterized in that, The inclination angle of the wedge-shaped guide rail is 10°.

8. A modular runner for long filter bags for baghouses according to claim 6, wherein, The end of the elastic locking tongue (402) is provided with a hook-shaped protrusion (402b) that cooperates with the wedge-shaped guide rail (401a).

9. The modular long filter bag for a baghouse according to claim 1, wherein, Each of the connecting ends of the adjacent segmented keel modules (1) is provided with an integrated support ring (3). The integrated support ring (3) is fixed to the outside of the longitudinal keel rib (104). The surface of the integrated support ring (3) is covered with a wear-resistant layer (301a).

10. The modular long filter bag for a baghouse according to claim 9, wherein, The integrated support ring (3) is provided with multiple through holes, which penetrate the wear-resistant layer outward.

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