Preheater inner tube base plate for rotary kiln

Abstract

The utility model belongs to the technical field of kilns, and specifically discloses an inner cylinder base plate of a preheater for a rotary kiln, including a liner, a latch and an end cover. The liner is bent in an arc shape, and pin holes are symmetrically arranged on both sides. The cross section of the latch is designed to be U-shaped or C-shaped to fit the pin holes. A plurality of liner plates are spliced ​​into an inner liner by latches, which ensures the stability and sealing of the structure. At the same time, the fixing plate at the axial end of the liner matches the long strip hole on the end cover, and the two ends of the elastic member are respectively abutted against the end cover and the fixing plate, which enables the end cover to produce a slight displacement when subjected to a certain pressure, and the elastic member provides a restoring force, which effectively avoids the problem of the end cover being stuck due to thermal expansion and contraction, and ensures the long-term stable operation of the preheater. Through the cooperation of the latch and the pin hole, the quick connection and disassembly between the liner plates is realized, the installation process is simplified, and the convenience of maintenance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of kilns, and in particular relates to an inner cylinder base plate of a preheater for a rotary kiln. Background Art

[0002] The inner cylinder of the rotary kiln preheater is a key component in cement production. Its main function is to provide multi-stage recuperation heat exchange between raw material powder and hot air at the kiln tail, ensuring that the material reaches a suitable calcination temperature before entering the rotary kiln. The inner cylinder is located at the core of the preheater, and its performance directly affects the efficiency and stability of the entire preheating system.

[0003] Traditionally, the inner cylinder of the preheater is mostly made of nickel-chromium heat-resistant alloy steel. However, this material is prone to corrosion and wear in high temperature and acid-base environments, resulting in a short service life of the inner cylinder and insufficient high temperature wear resistance. It is easy to cause performance degradation or even failure due to corrosion and wear. This not only increases maintenance costs, but may also affect the normal operation of the rotary kiln.

[0004] The existing Chinese utility model patent with announcement number CN210070630U provides a rotary kiln preheater inner cylinder base plate, including an inner cylinder base plate, a shock-absorbing reinforcement mechanism and a ferrule. A plurality of inner cylinder base plates are provided, and the plurality of inner cylinder base plates are combined to form a cylindrical preheater inner cylinder. A shock-absorbing reinforcement mechanism is provided in a square installation groove corresponding to the connecting grooves provided by two adjacent inner cylinder base plates. When subjected to high temperature, the joint of the inner cylinder base plates has a certain extension space, so as to ensure that the preheater inner cylinder has good thermal vibration performance and good shock-absorbing performance; however, its structure is relatively complex, and the efficiency of disassembly and maintenance needs to be improved. Utility Model Content

[0005] Aiming at the problem that the structure of the inner cylinder base plate of the preheater in the prior art is relatively complicated and the efficiency of disassembly and maintenance needs to be improved, a preheater inner cylinder base plate for a rotary kiln is proposed. The utility model provides the following technical solutions:

[0006] A preheater inner cylinder base plate for a rotary kiln comprises a liner, a latch and an end cover, wherein the liner is bent in an arc shape, pin holes are symmetrically arranged on both sides of the liner, the cross section of the latch is U-shaped or C-shaped, a plurality of liner plates are arranged, and the plurality of liner plates are circularly spliced ​​and connected by latches to form an inner liner cylinder; a fixing plate is fixedly connected to the axial end of the liner, an elongated hole for accommodating the fixing plate is arranged on the end cover, the fixing plate is detachably connected to an axis limit assembly for preventing the end cover from axially moving, an elastic member is installed in the elongated hole, and the two ends of the elastic member are respectively abutted against the end cover and the fixing plate.

[0007] Preferably, the axial limiting assembly includes a bolt and a gasket, the bolt passes through the gasket and is threadedly connected to the fixing plate, and the gasket abuts against the end cover.

[0008] Preferably, the end cover is further provided with a mounting groove, the mounting groove is communicated with the elongated hole, and the pad is installed in the mounting groove.

[0009] Preferably, the elastic member is a compression spring.

[0010] Preferably, the fixing plate is arranged in the middle of the end surface of the lining plate.

[0011] Preferably, the inner arc-shaped surface of the lining plate has rounded edges.

[0012] Preferably, the cross section of the latch is C-shaped.

[0013] Preferably, the end of the latch pin is fixedly connected with a radial inner baffle.

[0014] Preferably, radial outer baffles are fixedly connected to the end surface of the liner, and each radial outer baffle is enclosed on the outside of the end cover.

[0015] Preferably, the elongated holes are extended along the radial direction of the inner liner.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. Through the cooperation of the pin and the pin hole, the quick connection and disassembly between the liner plates is realized, which simplifies the installation process and improves the convenience of maintenance. When part of the liner plates need to be replaced or repaired, it can be completed quickly, reducing downtime and maintenance costs;

[0018] 2. The inner liner cylinder formed by splicing multiple liner plates, combined with the use of axial limit components and elastic parts, ensures the sealing and stability of the entire inner cylinder base plate;

[0019] 3. The use of elastic parts enables the inner tube base plate to adapt to a certain degree of thermal expansion and contraction, avoiding structural damage caused by temperature changes. At the same time, the C-shaped cross-section design of the pin also increases the firmness of the connection, allowing the inner tube base plate to withstand greater pressure and impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0021] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0022] Figure 3 yes Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0023] Figure 4 yes Figure 1A schematic diagram of the local enlarged structure at C in the middle;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the liner;

[0025] Figure 6 It is a three-dimensional structural diagram of the latch;

[0026] In the accompanying drawings, 1, lining plate; 11, pin hole; 12, radial outer baffle plate; 13, fixing plate; 2, latch pin; 21, radial inner baffle plate; 3, end cover; 31, long hole; 32, mounting groove; 4, axis limit assembly; 41, bolt; 42, gasket. DETAILED DESCRIPTION

[0027] The directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the utility model.

[0028] like Figure 1-6 As shown, a preheater inner cylinder base plate for a rotary kiln includes a liner 1, a latch 2 and an end cover 3. The liner 1 is curved in an arc shape, and pin holes 11 are symmetrically arranged on both sides. The cross section of the latch 2 is designed to be U-shaped or C-shaped to fit the pin holes 11. Multiple liner plates 1 are spliced ​​into an inner liner through the latch 2, ensuring the stability and sealing of the structure. The axial end of the liner 1 is fixedly connected with a fixing plate 13, and the end cover 3 is provided with a long hole 31 for accommodating the fixing plate 13. The fixing plate 13 is detachably connected with an axis limit assembly 4 for preventing the axial movement of the end cover 3. The fixing plate 13 is matched with the long hole 31, and the upper part of the long hole 31 is through-arranged. The two ends of the elastic member are respectively abutted against the end cover 3 and the fixing plate 13, so that the end cover 3 can produce a slight displacement when subjected to a certain pressure, and the elastic member provides a restoring force, which effectively avoids the problem of the end cover 3 being stuck due to thermal expansion and contraction, and ensures the long-term stable operation of the preheater.

[0029] Furthermore, the axial limit assembly includes a bolt 41 and a pad 42. The bolt 41 passes through the pad 42 and is threadedly connected to the fixing plate 13. The pad 42 is tightly abutted against the end cover 3, which enhances the fixing effect of the end cover 3 and also makes the installation and adjustment process more convenient. The mounting groove 32 provided on the end cover 3 is connected to the long hole 31, and the pad 42 is installed in the mounting groove 32. Such a layout makes the overall structure more compact.

[0030] In order to meet the needs of different usage scenarios, the elastic member uses a compression spring, whose high elasticity and excellent restoring force can easily cope with various temperature changes. The fixing plate 13 is carefully arranged in the middle of the end surface of the liner 1 to ensure that the end cover 3 is evenly stressed, thereby improving the stability of the structure.

[0031] In addition, the edges of the inner arc surface of the liner 1 are rounded, which effectively reduces wear and extends the service life. At the same time, the adjacent liner 1 forms a fitting gap on the inside, which can be used to promote the elastic deformation of the liner 1. The latch 2 is designed with a C-shaped cross-section, and the cross-section is thick at both ends and thin in the middle. The middle part has good elasticity, and the two ends can be used for limiting. The latch 2 does not completely fill the aforementioned fitting gap, which not only ensures the firmness of the connection, but also facilitates installation and disassembly. Specifically, after the latch 2 is assembled, the inner side of the latch 2 is smoothly connected to the inner side of the inner liner. The radial inner baffle 21 at the end of the latch 2 and the radial outer baffle 12 at the end face of the liner 1 are jointly enclosed on the outside of the end cover 3, forming a solid fixed structure, which effectively prevents the displacement of the end cover 3 in a high temperature environment.

[0032] The long holes 31 are extended along the radial direction of the inner liner. Such a layout enables the end cover 3 to produce a slight displacement in the radial direction when it expands and contracts due to heat, thereby avoiding structural damage caused by axial displacement.

[0033] Specifically, in this embodiment, eight liner plates 1 are provided, and other numbers can be selected according to actual needs.

[0034] When assembling this preheater inner tube base plate, first, it is necessary to tightly connect multiple arc-shaped liner plates 1 with the pin holes 11 through the U-shaped or C-shaped cross-section of the pin 2, so as to splice them into a complete inner liner tube. Next, the fixing plate 13 at the axial end of each liner plate 1 is matched with the long hole 31 on the end cover 3 to ensure that the fixing plate 13 can be smoothly inserted into the hole. Subsequently, an elastic member is installed between the fixing plate 13 and the end cover 3 to ensure that it can provide restoring force when under pressure. Finally, an axial limit assembly composed of bolts 41 and gaskets 42 is used to firmly connect the fixing plate 13 to the end cover 3. The gasket 42 should be tightly abutted against the end cover 3 to complete the assembly of the entire preheater inner tube base plate. The entire assembly process is simple and efficient, ensuring the stability and sealing of the structure.

[0035] In general, the utility model significantly improves the stability and sealing of the structure through its unique design and structure, while fully considering the performance changes of the material in a high temperature environment, ensuring the long-term stable operation of the preheater, and is easy to disassemble and assemble, which can effectively improve the disassembly and maintenance efficiency.

Claims

1. A preheater inner tube substrate for a rotary kiln, characterized in that: The invention comprises a lining plate (1), a latch (2) and an end cover (3), wherein the lining plate (1) is bent in an arc shape, pin holes (11) are symmetrically arranged on both sides of the lining plate (1), the cross section of the latch (2) is U-shaped or C-shaped, a plurality of lining plates (1) are arranged, and the plurality of lining plates (1) are circularly spliced ​​and connected through the latch (2) to form an inner lining tube; a fixing plate (13) is fixedly connected to an axial end of the lining plate (1), the end cover (3) is provided with a long hole (31) for accommodating the fixing plate (13), the fixing plate (13) is detachably connected to an axis limit assembly (4) for preventing the end cover (3) from axially moving, an elastic member is installed in the long hole (31), and the two ends of the elastic member are respectively abutted against the end cover (3) and the fixing plate (13).

2. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The axis limiting assembly comprises a bolt (41) and a pad (42); the bolt (41) passes through the pad (42) and is threadedly connected to the fixing plate (13); and the pad (42) abuts against the end cover (3).

3. The preheater inner cylinder substrate for a rotary kiln according to claim 2, characterized in that: The end cover (3) is also provided with a mounting groove (32), the mounting groove (32) is communicated with the elongated hole (31), and the pad (42) is mounted in the mounting groove (32).

4. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The elastic member is a compression spring.

5. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The fixing plate (13) is arranged in the middle of the end surface of the lining plate (1).

6. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The inner arc-shaped edge of the lining plate (1) is rounded.

7. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The cross section of the latch pin (2) is C-shaped.

8. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The end of the latch pin (2) is fixedly connected to a radial inner baffle plate (21).

9. The preheater inner cylinder substrate for a rotary kiln according to claim 1 or 8, characterized in that: A radial outer baffle (12) is fixedly connected to the end surface of the lining plate (1), and each radial outer baffle (12) is enclosed on the outside of the end cover (3).

10. The preheater inner cylinder substrate for a rotary kiln according to claim 1, characterized in that: The elongated holes (31) are arranged to extend along the radial direction of the inner liner.

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