Drop rod seal

Abstract

The utility model relates to a falling rod sealing device belongs to the technical field of industrial equipment sealing. Including falling rod frame and installing elastic support mechanism on the falling rod, and the falling rod is hung in the downside of falling rod frame through chain, elastic support mechanism includes locating block, stud, adjusting nut and spring, locating block fixed mounting is in the falling rod frame, the stud is set in the locating block through the coupling, and the adjusting nut of locating block below is sleeved on the stud, and the spring is set between adjusting nut and falling rod, and the falling rod is closely contacted with the trolley sealing plate through the elastic force provided by spring. The utility model adds the elastic support mechanism on the basis of existing falling rod, so that in addition to falling rod can rely on the self weight and trolley top surface contact, still can rely on the elastic force that elastic support mechanism adds and trolley top surface contact, ensure that the sealing is good, avoid the air leakage.

Description

Technical Field

[0001] This utility model belongs to the field of industrial equipment sealing technology and relates to a drop bar sealing device. Background Technology

[0002] In hot air systems (such as industrial furnaces), the sealing performance between the furnace hood and the moving trolley is one of the key factors affecting the system's thermal efficiency. Poor sealing leads to hot air leakage, resulting in energy waste and process instability. The "drop bar sealing device" is a common method for solving the sealing problem between the furnace hood and the trolley. Its basic design principle is based on the weight of the drop bar itself, which keeps its bottom surface in sliding contact with the top surface of the trolley, thus forming a sealing surface. The current solution has problems and shortcomings mainly in the following two aspects:

[0003] (1) The source of sealing force is complex and unstable. In practical applications, to prevent air leakage between the drop bar and the drop bar frame, an additional spring force is usually required to press the drop bar firmly against the drop bar frame. This means that the effective sealing pressure between the bottom surface of the drop bar and the top surface of the trolley depends not only on the weight of the drop bar itself, but is also significantly affected by the static friction between the drop bar and the drop bar frame. The magnitude and direction of the friction force are uncertain, which can weaken the effective sealing pressure and may even lead to insufficient or uneven sealing contact pressure, thereby affecting the reliability of the seal.

[0004] (2) Sensitive to the flatness of the trolley, there is a problem of "step interference". Due to manufacturing or installation errors or thermal deformation, the sealing plates on adjacent trolleys may not be on the same horizontal plane, forming a height difference (i.e., "step"). When the trolley moves over such a step, the drop bar will interfere with and collide with the edge of the step. This collision may cause the drop bar to jump up instantly, get stuck, or deflect. "Step interference" also leads to insufficient automatic reset capability. After a "step interference" collision, the relative height position between the drop bar and the trolley will change unexpectedly. The existing design relies solely on gravity and lacks an effective and reliable automatic reset mechanism, making it difficult to ensure that the drop bar can quickly and stably regain tight and uniform contact with the top surface of the trolley after the collision. This further exacerbates the risk of seal failure, especially in areas where steps are frequently passed.

[0005] In summary, the existing drop bar sealing device has the following technical defects that urgently need to be addressed: the sealing pressure is affected by the additional friction force, making it unstable and potentially insufficient; it is susceptible to the influence of the "steps" in the workshop, resulting in collision interference; and it lacks reliable automatic reset capability after a collision, affecting the continuous effectiveness of the seal.

[0006] Therefore, there is an urgent need to design a new drop bar sealing device to overcome the above-mentioned defects and improve the reliability, stability and adaptability of the seal to uneven working conditions of the trolley. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a drop bar sealing device that can overcome the shortcomings of the prior art and utilize the self-restoring property of the spring to enable the drop bar to better contact the trolley surface and achieve a good seal.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] The drop bar sealing device includes a drop bar frame and a drop bar, with the drop bar suspended from the lower side of the drop bar frame by a chain. It also includes several elastic support mechanisms installed on the top of the drop bar. Each elastic support mechanism includes a positioning block, a stud, an adjusting nut, and a spring. The positioning block is fixedly installed on the drop bar frame. The stud is set in the positioning block via a connecting member, with a gap between the bottom surface of the stud and the top surface of the drop bar. The adjusting nut, located below the positioning block, is fitted onto the stud and can rotate up and down along the stud's axial direction. The spring is positioned between the adjusting nut and the drop bar, with its upper end fitted onto the stud and pressed against by the adjusting nut. The lower end of the spring presses against the top surface of the drop bar, ensuring that the drop bar is in close contact with the trolley sealing plate through the elastic force provided by the spring.

[0010] Furthermore, the connecting component includes an upper connecting nut and a lower connecting nut respectively located at the upper and lower ends of the positioning block. The stud passes through the upper connecting nut, the positioning block, and the lower connecting nut in sequence and is threadedly connected to the upper and lower connecting nuts to fix the stud in the positioning block.

[0011] Furthermore, upper and lower washers are provided between the upper and lower connecting nuts and the positioning block respectively.

[0012] Furthermore, a stop ring is provided between the adjusting nut and the spring.

[0013] Furthermore, the spring and the stop ring are detachably connected.

[0014] Furthermore, the top surface of the drop bar is provided with a groove, and the bottom of the spring is embedded in the groove.

[0015] Furthermore, a connecting plate is provided between adjacent drop bars to cover the gap between them.

[0016] Furthermore, the two ends of the drop bar are matching lap joints, so that the front and rear drop bars can overlap and fasten together.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1) This invention adds an elastic support mechanism to the existing drop bar, allowing the drop bar to contact the trolley top surface not only by its own weight but also by the elastic force applied by the elastic support mechanism. The sealing force mainly comes from the controllable spring force, rather than the uncontrollable static friction between the drop bar and the drop bar frame. The spring directly presses the drop bar downwards (rather than applying pressure indirectly through the drop bar frame), eliminating the weakening effect of friction on the sealing force at its source. Compared with the prior art, the sealing pressure is stable and controllable, significantly improving sealing reliability.

[0019] 2) The spring, acting as an energy-absorbing element, transforms rigid collisions into flexible buffers, preventing the falling rod from bouncing or jamming, thus achieving elastic cushioning. The spring provides a continuous downward restoring force, replacing the passive reset that relies solely on gravity, ensuring rapid and precise return to its original position after a collision. This achieves a closed loop of "collision-avoidance-self-reset," adapting to trolley flatness errors and ensuring continuous sealing.

[0020] 3) The connecting plate solves the problem of leakage between the drop bars, and the spring realizes dynamic sealing between the drop bar and the platform workshop. Through multi-level sealing protection, a three-dimensional sealing network is formed.

[0021] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is an axial view of the drop bar sealing device;

[0024] Figure 2 for Figure 1 The main view;

[0025] Figure 3 for Figure 2 AA section view;

[0026] Figure 4 for Figure 2 BB cross-sectional view;

[0027] Figure 5 for Figure 2 X-magnified view;

[0028] Figure 6 for Figure 5 HH cross-sectional view;

[0029] Figure 7 for Figure 2 A magnified Y-view (without connecting plate);

[0030] Figure 8 for Figure 2 A magnified Y-view (with connecting plate);

[0031] Figure 9 This is a side view of the integrated drop bar.

[0032] Figure 10 for Figure 9 Top view;

[0033] Figure 11 This is an axial view of the integrated drop bar sealing device.

[0034] Reference numerals: 1. Elastic support mechanism; 2. Positioning block; 3. Stud; 4. Upper connecting nut; 5. Upper washer; 6. Lower washer; 7. Lower connecting nut; 8. Adjusting nut; 9. Stop ring; 10. Spring; 11. Drop bar; 12. Trolley sealing plate; 13. Drop bar frame; 14. Connecting plate; 15. Chain; 16. Groove. Detailed Implementation

[0035] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0037] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Please see Figures 1 to 11 The present invention provides a bar-dropping sealing device, which includes a bar-dropping frame 13, a bar-dropping rod 11, and an elastic support mechanism 1. The bar-dropping rod 11 is suspended from the lower side of the bar-dropping frame 13 by a chain 15. The chain 15 connects the bar-dropping rod 11 to the bar-dropping frame 13, preventing the bar-dropping rod 11 from falling directly onto the trolley sealing plate 12 under its own weight.

[0039] Multiple elastic support mechanisms 1 are spaced apart and installed on the top of the drop bar 11. Each elastic support mechanism 1 includes a positioning block 2, a stud 3, an adjusting nut 8, and a spring 10. The positioning block 2 is fixedly installed on the drop bar frame 13. The stud 3 is connected to the positioning block 2 through a connecting piece, and there is a distance between the bottom surface of the stud 3 and the top surface of the drop bar 11. The adjusting nut 8 is located below the positioning block 2, is fitted on the stud 3, and can rotate to move up and down along the axial direction of the stud 3. The spring 10 is located between the adjusting nut 8 and the drop bar 11. The upper end of the spring 10 is fitted on the stud 3 and pressed by the adjusting nut 8. The bottom of the spring 10 is compressed against the top surface of the drop bar 11. The drop bar 11 is in close contact with the trolley sealing plate 12 through the elastic force provided by the spring 10.

[0040] This embodiment adds an elastic support mechanism 1 to the existing drop bar 11, so that in addition to the drop bar 11 being able to contact the top surface of the trolley by its own weight, it can also contact the trolley sealing plate 12 by the elastic force applied by the elastic support mechanism 1. This ensures a good seal and prevents air leakage.

[0041] Specifically, the spring 10 added to the top of the drop bar 11 in the device exerts its elastic force directly between the top surface of the drop bar 11 and the adjusting nut 8. The preload of the spring 10 can be precisely controlled by the adjusting nut 8, thus forming a stable main sealing force source. A certain distance is maintained between the bottom surface of the stud 3 and the top surface of the drop bar 11 to avoid rigid contact between the two and ensure that the spring force is transmitted to the drop bar without interference. When the drop bar 11 collides with the step, the impact force compresses the spring 10, allowing the drop bar to elastically displace upward. After passing the step, the compressed spring immediately releases its stored energy, pushing the drop bar 11 downward to reset and restore tight contact with the trolley sealing plate 12.

[0042] Example 1:

[0043] Please see Figure 1 , Figure 3 as well as Figure 5 As shown, the connecting component includes an upper connecting nut 4 and a lower connecting nut 7 located at the upper and lower ends of the positioning block 2. The stud 3 passes through the upper connecting nut 4, the positioning block 2, and the lower connecting nut 7 in sequence and is threadedly connected to the upper and lower connecting nuts to fix the stud 3 in the positioning block 2. In this embodiment, the upper and lower connecting nuts, through their threaded connection with the stud 3, can fix the connection between the stud 3 and the positioning block 2. At the same time, when adjusting the stud 3, the upper connecting nut 4 and the lower connecting nut 7 can be loosened to adjust the relative position between the positioning block 2 and the stud 3. This allows for adjustment of the gap between the stud 3 and the drop bar 11 according to the actual situation, avoiding contact between the drop bar 11 and the stud 3.

[0044] Furthermore, washers are provided between the upper and lower connecting nuts and the positioning block 2. An upper washer 5 is provided between the upper connecting nut 4 and the positioning block 2, and a lower washer 6 is provided between the lower connecting nut 7 and the positioning block 2. The two washers have a certain degree of elasticity. Through the elastic effect of the washers, a certain reverse force is applied to the upper connecting nut 4 and the lower connecting nut 7 respectively. Combined with the self-locking effect of the threaded connection, the stability between the connecting part and the stud 3 can be ensured, thereby fixing the stud 3 in the positioning block 2.

[0045] Example 2:

[0046] Please see again Figure 1 , Figure 3 as well as Figure 5 As shown, based on Embodiment 1, a stop ring 9 is also provided between the adjusting nut 8 and the spring 10. The main function of the stop ring 9 is to limit the position of the spring 10, that is, the outer diameter of the stop ring 9 is larger than the outer diameter of the spring 10, ensuring that the adjusting nut 8 can effectively compress the spring 10 through the stop ring 9 during adjustment.

[0047] Furthermore, please refer to Figure 6 As shown, the top surface of the drop bar 11 is provided with a groove 16, and the bottom of the spring 10 is embedded in the groove 16. In this embodiment, the position of the spring 10 is limited by the groove 16 to prevent the spring 10 from being ejected from the top surface of the drop bar 11 during compression, ensuring that the spring does not deflect or get stuck during dynamic avoidance and maintaining the accuracy of the reset trajectory.

[0048] Preferably, the spring 10 and the stop ring 9 are detachably connected. This allows for the selection / replacement of a suitable spring 10 based on actual working conditions, facilitating future maintenance.

[0049] Example 3:

[0050] Please see again Figure 1 and Figure 2 , Figure 4 , Figure 7 as well as Figure 8 As shown, a connecting plate 14 is provided between adjacent drop bars 11 to cover the gap between adjacent drop bars 11 and eliminate lateral air leakage paths.

[0051] Example 4:

[0052] like Figure 9 , Figure 10 , Figure 11 As shown, the difference from the previous embodiment is that the drop bar 11 in this embodiment is a one-piece structure, and the front and rear ends of the drop bar 11 are designed as matching overlapping joints (as shown in the figure, a recessed structure), so that the front and rear drop bars can overlap and fasten each other, thereby avoiding air leakage.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A bar-dropping sealing device, comprising a bar-dropping frame and a bar, wherein the bar is suspended from the lower side of the bar-dropping frame by a chain; characterized in that: It also includes several elastic support mechanisms installed on the top of the drop bar. Each elastic support mechanism includes a positioning block, a stud, an adjusting nut, and a spring. The positioning block is fixedly installed on the drop bar frame. The stud is set in the positioning block through a connecting piece, and there is a distance between the bottom surface of the stud and the top surface of the drop bar. The adjusting nut located below the positioning block is fitted on the stud and can rotate up and down along the stud axis. The spring is set between the adjusting nut and the drop bar. The upper end of the spring is fitted on the stud and pressed by the adjusting nut. The lower end of the spring presses against the top surface of the drop bar, so that the drop bar is in close contact with the trolley sealing plate through the elastic force provided by the spring.

2. The drop bar sealing device according to claim 1, characterized in that: The connecting component includes an upper connecting nut and a lower connecting nut located at the upper and lower ends of the positioning block. The stud passes through the upper connecting nut, the positioning block, and the lower connecting nut in sequence and is threadedly connected to the upper and lower connecting nuts to fix the stud in the positioning block.

3. The drop bar sealing device according to claim 2, characterized in that: The upper and lower connecting nuts and the positioning block are respectively provided with upper and lower washers.

4. The drop bar sealing device according to any one of claims 1 to 3, characterized in that: A stop ring is also provided between the adjusting nut and the spring.

5. The drop bar sealing device according to claim 4, characterized in that: The spring and the stop ring are detachably connected.

6. The drop bar sealing device according to claim 4, characterized in that: The top surface of the drop bar has a groove, and the bottom of the spring is embedded in the groove.

7. The drop bar sealing device according to claim 1, characterized in that: A connecting plate is provided between adjacent drop bars to cover the gap between them.

8. The drop bar sealing device according to claim 1, characterized in that: The two ends of the drop bar are matching lap joints, so that the front and rear drop bars can overlap and fasten together.

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