A metal-rubber composite compensation and dust-proof device with a sealing structure

Abstract

The present invention discloses a metal rubber composite compensation and dust-proof device with a sealing structure, which relates to the technical fields of compensation and sealing. A first guide cylinder and a second guide cylinder extending inwards are respectively provided on a first connection end and a second connection end. The second guide cylinder is located outside the first guide cylinder, and the two are coaxially and cross-mounted with each other, and a first gap is provided between the two. A lip seal ring is hermetically connected in the first gap. A corrugated compensation pipe is fixedly connected between the first connection end and the second connection end. The corrugated compensation pipe is located outside the second guide cylinder and a second gap is provided between the two. The present invention adopts the first guide cylinder and the second guide cylinder which are coaxially and cross-mounted with each other, and cooperates with the outermost corrugated compensation pipe. A first gap is left between the first guide cylinder and the second guide cylinder, and a second gap is left between the corrugated compensation pipe and the second guide cylinder. The first gap and the second gap ensure the relative movement of large displacements in the three-dimensional space when they are subjected to vibration.

Description

Technical Field

[0001] The invention relates to the technical field of compensation and sealing, in particular to a metal-rubber composite compensation dustproof device with a sealing structure. Background Art

[0002] In the steel mills of steel enterprises, there are still many problems in the overall or individual compensation connection parts of the converter ore or ore powder conveying system, such as alloy leakage loss, vibration dust, compensation failure, etc. Once the compensation seal fails, it will lead to the loss of granular powder alloy, resulting in inaccurate feeding ratio of alloy materials and other raw materials, resulting in changes in molten steel composition, and even causing serious product quality problems, directly affecting the product's use level and economic benefits. Every year, steel mills are generally downgraded by customers due to product quality, which invisibly causes huge waste and value loss. Therefore, it is particularly important to develop a device for the vibrating feeder material inlet that has both compensation and shock absorption and sealing and dust prevention functions.

[0003] The sealing compensation device used at the inlet of the steelmaking alloy feeding vibrating feeder is required to have the following: ① compensation over a large distance, good sealing and dustproof effect, and long service life. ② It needs to be resistant to fatigue and repeated tension and compression, and be able to maintain softness, moderate elasticity, and high-frequency vibration resistance for a long time. ③ It needs to have a strong ability to restore to the original state. ④ When it fails, the entire device still has the function of preventing material loss. However, existing pipeline compensation devices such as metal corrugated compensators, non-metallic compensators, sleeve compensators, square compensators, etc. are not suitable for large displacement, large angle and high-frequency vibration due to their own structure and material, and therefore cannot meet the technical requirements of sealing compensation at the inlet of the steelmaking alloy feeding vibrating feeder. Summary of the invention

[0004] In response to the technical problems mentioned in the background technology, the purpose of the present invention is to provide a metal-rubber composite compensating dust-proof device with a sealing structure for the vibrating feeder feeding port in the steelmaking alloy converter feeding system, which has a large compensation amount over a large distance, is wear-resistant, fatigue-resistant, has a lasting resilience and a shock-absorbing effect.

[0005] The present invention adopts the following technical solution: A metal-rubber composite compensation dust-proof device with a sealing structure, which includes a first connection end and a second connection end. The first connection end and the second connection end are respectively provided with a first guide cylinder and a second guide cylinder extending inwards. The second guide cylinder is located outside the first guide cylinder. The two are coaxially and cross-mounted, and there is a first gap between them. A lip seal is hermetically connected in the first gap; A corrugated compensating pipe is fixedly connected between the first connection end and the second connection end. The corrugated compensating pipe is located outside the second guide cylinder and there is a second gap between them; In the working state, the second guide cylinder can swing between the first gap and the second gap, so that the second connection end is inclined at an angle θ with respect to the horizontal plane, and 0 < θ < 15°.

[0006] As an optimized solution, the corrugated compensating pipe includes a skeleton layer, and a first protective layer and a second protective layer respectively coated on the inner and outer layers of the skeleton layer. Among them, the skeleton layer is at least one layer of grid-shaped spring steel wire layer, and the spring steel wire layer is processed by steel wires with a diameter of 0.2 - 0.8 mm, and its mesh number is between 10 - 40 meshes; The first protective layer and the second protective layer are both made of one of natural rubber or synthetic rubber.

[0007] As an optimized solution, the top end of the lip seal is tightly connected to the outer wall of the first guide cylinder through a stainless steel clamp, and the bottom end is tightly attached to the inner wall of the second guide cylinder.

[0008] As an optimized solution, the lip seal is made of polyurethane rubber material.

[0009] As an optimized solution, the surface of the second guide cylinder is coated with a polytetrafluoroethylene layer, and the thickness of the polytetrafluoroethylene layer is 0.1 - 0.3 mm.

[0010] As an optimized solution, the diameter range D1 of the first guide cylinder is controlled within 250 - 1500 mm, and the difference between the diameter range D2 of the second guide cylinder and the diameter range D1 of the first guide cylinder is 20 - 300 mm.

[0011] As an optimized solution, sealing gaskets are provided at the joints of the first connection end, the second connection end and the material inlet.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] The metal rubber composite compensation dust-proof device with a sealing structure of the present invention adopts a first guide cylinder and a second guide cylinder that are coaxially and cross-mounted, and cooperates with the outermost corrugated compensation pipe. A first gap is left between the first guide cylinder and the second guide cylinder, and a second gap is left between the corrugated compensation pipe and the second guide cylinder. The first gap and the second gap can ensure the relative movement of large displacements in a three-dimensional space when they are subjected to vibration respectively.

[0014] The present invention adopts a corrugated compensation pipe with good shape retention ability and resistance to positive and negative pressures. While achieving a large expansion and contraction range, it has strong recovery performance, ensuring that when the whole device is working, it can not only meet the relative movement angle and displacement requirements due to vibration, but also play the roles of sealing dust and compensation, guaranteeing the long-term performance, stable structure of the product as a whole, and effectively extending the service life of the sealing compensation device. Brief Description of the Drawings

[0015] Figure 1 is the overall structural cross-sectional view of the embodiment of the metal rubber composite compensation dust-proof device with a sealing structure of the present invention;

[0016] Figure 2 is the structural cross-sectional view of the embodiment of the metal rubber composite compensation dust-proof device with a sealing structure of the present invention in a use state;

[0017] Figure 3 is Figure 2 the detailed structural schematic diagram of part A in

[0018] Among them, 1 - first connection end, 2 - second connection end, 3 - first guide cylinder, 4 - second guide cylinder, 5 - lip seal, 6 - corrugated compensation pipe, 7 - stainless steel clamp, 8 - polytetrafluoroethylene layer, 9 - material port, 10 - gasket, 11 - vibrator, 61 - skeleton layer, 62 - first protective layer, 63 - second protective layer. Detailed Embodiment

[0019] Hereinafter, for the convenience of those skilled in the art to understand the technical solution of the present invention, further description will be made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0020] In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, obviously, one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0021] A metal-rubber composite compensation dust-proof device with a sealing structure provided by the present invention is not only applicable to the vibrating feeder hopper in the steelmaking alloy converter feeding system, but also can be applied to the pipe orifices of powder conveying pipelines such as ore powder, flour, and coal powder. It has a very wide range of applications and is a sealing compensation device that integrates multiple advantages such as sealing, dust-proof environmental protection, and large compensation amount.

[0022] As Figure 1 shown, it is a sectional view of the overall structure of the metal-rubber composite compensation dust-proof device with a sealing structure of the present invention. In this embodiment, it includes a first connection end 1 and a second connection end 2 that are parallel to each other. The first connection end 1 and the second connection end 2 are respectively provided with a first guide cylinder 3 and a second guide cylinder 4 extending inward. The second guide cylinder 4 is located outside the first guide cylinder 3. The two are coaxially and cross-mounted, and there is a first gap between them. A lip seal ring 5 is hermetically connected in the first gap. A corrugated compensator 6 is fixedly connected between the first connection end 1 and the second connection end 2. The corrugated compensator 6 is located outside the second guide cylinder 4 and there is a second gap between them. In the working state, the second guide cylinder 4 can swing in space between the first gap and the second gap, so that the second connection end 2 is inclined at an angle θ with respect to the horizontal plane, satisfying 0 < θ < 30°.

[0023] In this embodiment, the first connection end 1 and the second connection end 2 can be connected up and down by flange plates. Flange holes for mating with the flange of the discharge bin are opened on the first connection end 1 and the second connection end 2, and they are assembled up and down through fastening bolts.

[0024] The first guide cylinder 3 is a guide cylinder with wear-resistant performance and can be made of wear-resistant and impact-resistant steel material. The first guide cylinder 3 can effectively reduce the direct contact between the dropped medium such as lumpy ore and ore powder and the inner wall part of the corrugated compensator 6, thereby effectively reducing the wear of its rubber part, improving its service life, and ensuring that under a large negative pressure condition, the corrugated compensator 6 still has the functions of compensation and dust prevention.

[0025] The second guide cylinder 4 is a guide cylinder with protective performance and can be made of high-elastic and high-toughness spring steel plate. During installation, its inner surface can be first surface-treated so that its surface roughness Ra reaches 0.8 - 1.6. The surface is cleaned with industrial alcohol, and under the conditions of dust-free, an environmental temperature of 30 - 40°C, and an environmental air humidity of 20 - 25%, a special polytetrafluoroethylene liquid is sprayed, with a spraying thickness of 0.1 - 0.3 mm, and a heat curing reaction is carried out to form a film in a dust-free environment at a temperature of 120 - 150°C, so it has better high-temperature resistance and corrosion resistance effects.

[0026] In this embodiment, the size ranges of the first guide cylinder 3 and the second guide cylinder 4 can be controlled according to the size of the discharge bin. The diameter range D1 of the first guide cylinder 3 is generally controlled between 250 and 1500 mm, and the difference between the diameter range D2 of the second guide cylinder 4 and the diameter range D1 of the first guide cylinder 3 is 20 - 300 mm.

[0027] In this embodiment, the corrugated compensator 6 is composed of steel wire and rubber, and has the dual functions of corrugated compensation and dust prevention. As Figure 3 shown, it includes a skeleton layer 61, and a first protective layer 62 and a second protective layer 63 respectively coated on the inner and outer layers of the skeleton layer 61. Among them, the skeleton layer 61 is at least one grid-shaped spring steel wire layer with a shaping and strengthening effect. The spring steel wire layer is processed from steel wires with a diameter of 0.2 - 0.8 mm, and the mesh number of the spring steel wire layer is between 10 and 40 meshes. The spring steel wire mesh is required to have good elasticity and toughness. The first protective layer 62 and the second protective layer 63 are both made of synthetic rubber and have corrosion resistance, high temperature resistance, and aging resistance properties. For example, natural rubber, butyl rubber, or ethylene propylene diene monomer rubber can be used. For the corrugated compensator 6 of this embodiment, by introducing a spring steel wire mesh skeleton into the rubber corrugation, not only can the shape retention ability of the rubber corrugation be increased on the basis of the original telescopic elasticity, but more importantly, the ability to resist large positive and negative pressures is effectively enhanced, avoiding the situation where the rubber body is deformed too much or ruptured after being pressed, ensuring the durability of the overall performance of the product and the structural stability, and thus effectively extending the service life of the device.

[0028] In this embodiment, the sizes of the first guide cylinder 3, the second guide cylinder 4, and the corrugated compensator 6 increase in sequence according to the use requirements. The space left between the first guide cylinder 3 and the second guide cylinder 4 can ensure the relative movement with a large displacement of each other in the three-dimensional space, and the telescopic range that the corrugated compensator 6 can achieve is larger. It not only meets the requirements for angles and displacements generated by the relative movement among the three during the operation of the entire device, but also has the effect of dust-proof sealing compensation.

[0029] In this embodiment, the lip seal 5 adopts a structure with a relatively long sealing lip. The long sealing lip can play a role in dust prevention and large-displacement compensation to ensure that the seal does not fail. The lip seal 5 is made of wear-resistant polyurethane rubber sealing material, and its material requirements include good toughness and elasticity, a temperature resistance above 120°C, and a tensile strength greater than 42 MPA. During production, it can be directly formed by using the polyurethane sealing material die casting process, or the polyurethane sealing material can be formed into a cylindrical blank through the casting process, and then the cylindrical blank is processed and formed on a rubber turning numerical control device according to the design drawing dimensions. The lip seal 5 is installed in the guide cylinder and placed in the first gap. The top is tightly connected to the outer wall of the first guide cylinder 3 through a stainless steel clamp 7, and the bottom is tightly attached to the inner wall of the second guide cylinder 4. The lip seal 5 is assembled with the polytetrafluoroethylene film inside the second guide cylinder 4, and the contact part forms a sealing and dust-proof structure. Since polytetrafluoroethylene can be used for a long time at 250°C and has an extremely low friction coefficient of only about 0.04, when the entire device is in a vibrating working state, the sliding friction resistance generated by the contact with the lip seal 5 is small, the wear is low, and the heat generation is small, thus greatly prolonging the sealing effect of the lip seal 5. The effective play of the role of the sealing and dust-proof structure can effectively seal the powder particles and dust, making it difficult for the powder particles and dust to cross the second guide cylinder 4 and deposit between the rubber inner layer of the corrugated compensator 6 and the second guide cylinder 4, reducing the wear of the outer rubber of the corrugated compensator 6 by impurities such as ore powder, prolonging the service life of the rubber inner layer of the corrugated compensator 6, and also avoiding the situation where the compensation performance of the corrugated compensator 6, such as its length, angle, and position, decreases due to excessive accumulation of ore powder and other substances filling into the rubber corrugations of the corrugated compensator 6, resulting in insufficient compensation performance when the vibration or displacement is too large and causing the rubber layer to tear.

[0030] As shown below Figure 2-3 The state of the compensation and dust-proof device in this embodiment during use is described as follows: To enhance the overall sealing performance after the device is installed, a rubber sealing gasket 10 can be pasted on the connection surface between the first connection end 1 and the second connection end 2, and the first connection end 1 of this sealing compensation device is fixedly connected to the flange of the upper discharge bin and the second connection end 2 of this sealing compensation device is fixedly connected to the flange of the lower vibrating feeder by using the method of connection and fixation with fastening bolts. Before installing the second connection end 2, check whether the lip seal 5 and the second guide cylinder 4 are installed in place.

[0031] After the equipment starts to work and run, the ore in the upper discharge bin falls into a feeder that is constantly vibrating at high frequency through this device. Under the vibration of the vibrator 11, the ore enters the next technological process through the feeder pipeline. During the process of the ore falling from the discharge bin into the vibrating feeder, since the mass of the ore powder falling on the unit area of the feeder per unit time is different, and at the same time, the weight of the ore powder remaining on the unit area of the vibrating feeder is also different, it will cause the vibrating feeder to not only have high-frequency vibrations with large displacements in the vertical direction during operation, but also have horizontal movements and shakes. As Figure 2 shown, when in the static state, the center position of the second connection end 2 of this compensation and dust-proof device is O, and when in the working state, the center position of the second connection end 2 is O1. The connecting surface of the second connection end 2 in the working state has an inclined angle of θ in the horizontal direction relative to the horizontal plane in the static state. One side of the corrugated compensating pipe 6 is subjected to jitter deformation and stretching, and the other side is deformed and compressed. Since the corrugated compensating pipe 6 has both the strength and elasticity of steel wire and the elasticity and sealing performance of rubber, this device has more excellent tear resistance, large displacement compensation performance, and good compensation follow-up performance with the vibrating feeder, greatly increasing the service life of the device and having a better sealing and compensation effect. Since the positions of the second guide cylinder 4 and the lip seal 5 change at any time when the vibrating feeder is in the working state, the radial interaction force between the lip seal 5 and the second guide cylinder 4 will also change at any time, and the compression deformation degree of the lip seal 5 is also different. Therefore, the lip seal 5 in this embodiment is made of polyurethane material and a large compression deformation amount is reserved during assembly. In the case of the maximum vibration displacement deformation, the lip seal 5 can make the lip always keep sealed contact with the polytetrafluoroethylene layer on the inner wall of the second guide cylinder 4 through large elastic deformation as much as possible, so as to realize the sealing of the vibrating dust and the particles rebounding from the falling material, effectively preventing them from falling into or delaying their falling into the part between the second guide cylinder 4 and the corrugated compensating pipe 6 as much as possible. In this way, it plays a protective role for the rubber in the corrugated compensating pipe 6 part, reducing the occurrence of situations such as the outer rubber layer of the corrugated compensating pipe 6 being scratched or cut by the falling ore. At the same time, it also effectively avoids the compensation performance of the corrugated compensating pipe 6, such as its length, angle, position, etc., decreasing after excessive accumulation of ore powder and other substances filling into the rubber corrugations of the corrugated compensating pipe 6, resulting in insufficient compensation performance when the jitter or displacement is too large and causing the rubber layer to tear.

[0032] In summary, for the metal rubber composite compensation dust-proof device with a sealing structure of the present invention, the first flow guide cylinder 3 and the second flow guide cylinder 4 are coaxially and cross-mounted, and cooperate with the corrugated compensation pipe 6 on the outermost side. A first gap is left between the first flow guide cylinder 3 and the second flow guide cylinder 4, and a second gap is left between the corrugated compensation pipe 6 and the second flow guide cylinder 4. The first gap and the second gap can ensure the relative movement of large displacements in a three-dimensional space when they are subjected to vibration respectively.

[0033] The present invention uses a corrugated compensation pipe 6 with good shape retention ability and resistance to positive and negative pressures. While achieving a large expansion and contraction range, it has strong recovery performance, ensuring that during the operation of the entire device, it can not only meet the requirements of relative movement angles and displacements due to vibration, but also meet the requirements of dust-proof sealing compensation, ensuring the durability of the overall performance of the product, the stability of the structure, and effectively extending the service life of the sealing compensation device.

[0034] A metal rubber composite compensation dust-proof device with a sealing structure provided by the present invention is not only applicable to the vibrating feeder feed port in the steelmaking alloy converter feeding system, but also can be applied to the pipe orifices of powder conveying pipelines such as mineral powder, flour, and pulverized coal. It has a very wide range of applications and is a sealing compensation device integrating multiple advantages such as sealing, dust-proof environmental protection, and large compensation amount.

[0035] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A metal-rubber composite compensation dust-proof device with a sealing structure, comprising a first connection end (1) and a second connection end (2) that are parallel to each other, characterized in that, The first connection end (1) and the second connection end (2) are respectively provided with a first guide cylinder (3) and a second guide cylinder (4) extending inwards. The second guide cylinder (4) is located outside the first guide cylinder (3). The two are coaxially and cross-mounted, and there is a first gap between them. A lip seal ring (5) is hermetically connected in the first gap; A corrugated compensating pipe (6) is fixedly connected between the first connection end (1) and the second connection end (2). The corrugated compensating pipe (6) is located outside the second guide cylinder (4) and there is a second gap between them; In the working state, the second guide cylinder (4) can swing between the first gap and the second gap, so that the second connection end (2) is inclined at an angle θ with respect to the horizontal plane.

2. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 1, characterized in that, The corrugated compensating pipe (6) includes a skeleton layer (61), and a first protective layer (62) and a second protective layer (63) respectively coated on the inner and outer layers of the skeleton layer (61). Among them, the skeleton layer (61) is at least one layer of grid-shaped spring steel wire layer, and the spring steel wire layer is processed by steel wires with a diameter of 0.2-0.8 mm, and its mesh number is between 10-40 meshes; The first protective layer (62) and the second protective layer (63) are made of one of natural rubber or synthetic rubber.

3. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 1, characterized in that, The top end of the lip seal ring (5) is tightly connected to the outer wall of the first guide cylinder (3) through a stainless steel clamp (7), and the bottom end is tightly attached to the inner wall of the second guide cylinder (4).

4. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 1, characterized in that, The lip seal ring (5) is made of polyurethane rubber material.

5. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 4, characterized in that, The surface of the second guide cylinder (4) is coated with a polytetrafluoroethylene layer (8), and the thickness of the polytetrafluoroethylene layer (8) is 0.1-0.3 mm.

6. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 5, characterized in that, The diameter range D1 of the first guide cylinder (3) is controlled within 250-1500 mm, and the difference between the diameter range D2 of the second guide cylinder (4) and the diameter range D1 of the first guide cylinder (3) is 20-300 mm.

7. The metal-rubber composite compensation dust-proof device with a sealing structure according to claim 1, characterized in that, Sealing gaskets (10) are provided at the joints of the first connection end (1), the second connection end (2) and the material inlet (9).

Images