Inlet guide convenient to disassemble

Abstract

The invention relates to the technical field of steel rolling guiding, in particular to an inlet guide convenient to disassemble, which comprises a guide main body, an upper base fixed at the bottom of the guide main body and a lower base arranged at the bottom of the upper base, the upper base is sunken to form a dovetail groove in sliding fit with the dovetail piece, one end of the upper base protrudes to form a dovetail protrusion extending in the rolled piece conveying direction, and the lower base is provided with a first abutting part abutting against the dovetail protrusion. A containing groove which abuts against the dovetail protrusion in an attached mode is formed between the first abutting part and the lower base. The first abutting part and the second abutting part are arranged at the two ends, extending in the length direction, of the upper base, the guide and guard body is prevented from deviating along with conveying of rolled pieces, and the stability of the guide and guard body installed on the rolling mill is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling guides, and in particular to an inlet guide that is easy to disassemble. Background Art

[0002] Steel rolling is an important metal forming processing method. The rotating rollers apply pressure to the steel billet to cause it to undergo plastic deformation, thereby obtaining steel with the required shape, size and performance. Failure to properly align the workpiece before it enters the rolling mill or uneven thickness of the workpiece will cause the workpiece to shift. Therefore, a guide is needed to help the workpiece enter and exit the roller hole accurately and stably in a predetermined direction and state. In the steel rolling process, the guide device plays a vital role.

[0003] According to the installation position of the guide guard, the guide guard is divided into inlet guide guard and outlet guide guard. The inlet guide guard is installed at the inlet of the roll hole to guide the rolled piece to enter the roll hole correctly. The outlet guide guard is installed at the outlet of the roll hole to ensure that the rolled piece can leave the roll hole smoothly after rolling is completed.

[0004] When the imported guide is installed at the entrance of the roll hole, a lower base is fixed on the rolling mill, and the guide body is welded to the upper base. Bolts are provided on the upper base. The bolts pass through the upper base and then enter the threaded holes on the lower base. The bolts are threadedly locked with the threaded holes, and the upper base and the lower base are locked and fixed, thereby achieving the fixation of the guide body and the lower base. When the guide body is worn and needs to be replaced, it is necessary to remove the bolts with the help of tools to remove the guide body and the upper base from the lower base, which is more troublesome. If the bolts are stripped or the threads are blocked, it will take longer to remove the guide body, affecting the working efficiency of steel rolling.

[0005] When the above-mentioned imported guides are disassembled, the bolts are prone to thread slippage or thread blocking. The disassembly process is not convenient enough, which affects the production efficiency of the rolling mill and there is room for improvement. Summary of the invention

[0006] In order to facilitate the removal of the inlet guide from the rolling mill, the present application provides an inlet guide that is easy to remove.

[0007] The present application provides an easily disassembled inlet guide, which adopts the following technical solution: A disassembled import guide comprises a guide body, an upper base fixed to the bottom of the guide body, and a lower base arranged at the bottom of the upper base, wherein the lower base protrudes to form a dovetail piece extending along the conveying direction of the rolled piece, the upper base is recessed to form a dovetail groove slidably matched with the dovetail piece, one end of the upper base protrudes to form a dovetail protrusion extending in the conveying direction of the rolled piece, the lower base is provided with a first pressing portion pressed against the dovetail protrusion, a placement groove pressed against the dovetail protrusion is formed between the first pressing portion and the lower base, and the angle formed between the pressing surface of the dovetail protrusion and the first pressing portion and the surface of the lower base is an acute angle.

[0008] By adopting the above technical solution, the guide body is fixed to the upper base, the dovetail piece on the lower base is inserted into the dovetail groove of the upper base, and the dovetail piece slides in the dovetail groove along the conveying direction of the rolled piece until the dovetail protrusion of the upper base is inserted into the placement groove, the dovetail protrusion is tightly pressed against the first pressing part of the lower base, and the dovetail piece is adapted to the dovetail groove, thereby limiting the movement of the upper base and the lower base along the width direction of the dovetail piece and along the vertical height direction of the dovetail piece. The upper base is pressed against the first pressing part through the dovetail protrusion, thereby limiting the upper base and the guide body. The movement of the main body along the conveying direction of the rolled piece ensures that the guide body is stable in its position on the rolling mill. The angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is an acute angle, which strengthens the degree of contact between the dovetail protrusion and the first abutting part. When the guide body needs to be replaced, it is only necessary to slide the upper base and the guide body away from the conveying direction of the rolled piece, and the dovetail part slides out of the dovetail groove to complete the disassembly of the guide body. The installation and disassembly processes are convenient and quick, and no tools are required, which saves time for steel rolling production.

[0009] Optionally, the angle formed between the dovetail protrusion, the abutting surface of the first abutting portion and the surface of the lower base is 45°.

[0010] By adopting the above technical scheme, it is possible to avoid that the angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is too large, the contact between the dovetail protrusion and the first abutting part and the surface of the lower base is too sharp, and the damage of the first abutting part is accelerated. It is also possible to avoid that the angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is too small, the degree of abutment between the dovetail protrusion and the first abutting part is weakened, and the stability of the guide body installed on the rolling mill is reduced. The angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is set to 45°, which not only ensures the stability of the guide body installation, but also avoids the first abutting part from being damaged too quickly.

[0011] Optionally, the upper base is protrudingly formed with a second pressing portion that presses against the lower base, and the second pressing portion and the first pressing portion are respectively arranged at two ends of the upper base extending along the length direction.

[0012] By adopting the above technical solution, the arrangement of the second tightening portion further enhances the stability of the guide body on the lower base, and the first tightening portion and the second tightening portion are respectively arranged at both ends of the upper base extending along the length direction, thereby avoiding the guide body from being offset along the length direction of the dovetail piece, thereby ensuring the stability of the guide body installed on the rolling mill.

[0013] Optionally, the lower base is protruded to form a third pressing portion that fits tightly against the second pressing portion, and the angle between the pressing surface of the third pressing portion and the second pressing portion and the top surface of the lower base is an acute angle.

[0014] By adopting the above technical solution and disposing the third abutting portion, the abutment between the second abutting portion and the lower base is enhanced, thereby enhancing the stability of the guide body on the rolling mill.

[0015] Optionally, the first clamping portion is detachably connected to the lower base, and a communicating through hole is provided on the first clamping portion and the lower base, and a locking assembly for locking the first clamping portion and the lower base is provided in the through hole.

[0016] By adopting the above technical scheme, during the conveying process of the rolled piece, the guide body tends to move toward the first clamping part as the rolled piece is conveyed, the dovetail protrusion is pressed against the first clamping part, and the first clamping part of the lower base is easily damaged, and then a new lower base needs to be replaced, which increases the production cost, and the first clamping part breaks from the lower base in a short period of time, which makes it inconvenient to observe the situation of the first clamping part in advance and take timely countermeasures. The first clamping part and the lower base are set to be detachably connected. As the first clamping part is continuously subjected to force, the locking assembly in the through hole will become loose, and the gap between the lower end face of the first clamping part and the surface of the lower base will change accordingly, so that the degree of separation of the first clamping part from the lower base can be observed from the gap between the lower end face of the first clamping part and the lower base, so that it is convenient to prepare the first clamping part for replacement in advance, and the area of ​​the lower base except the first clamping part can also be reused.

[0017] Optionally, the upper base is provided with an oil guide hole connected to the dovetail groove, the contact surface between the top surface of the dovetail piece and the inner wall of the dovetail groove is an arc-shaped contact surface, and an oil storage cavity is formed between the dovetail of the dovetail groove and the dovetail piece.

[0018] By adopting the above technical scheme, during the relative displacement of the upper base and the lower base, the added lubricating oil can enter the sliding surface between the dovetail piece and the inner wall of the dovetail groove, thereby reducing the degree of wear between the dovetail piece and the inner wall of the dovetail groove. The lubricating oil has a certain adhesion and can fill the gap between the upper base and the lower base to prevent dust, iron sheets and other impurities from entering the contact surface between the upper base and the lower base, affecting the fitting effect of the upper base and the lower base. The setting of the oil storage cavity avoids frequent addition of lubricating oil, thereby allowing the contact surface between the upper base and the lower base to be continuously covered with lubricating oil. The contact surface between the dovetail piece and the inner wall of the dovetail groove is an arc-shaped contact surface. The lubricating oil entering from the oil guide hole is easy to flow along the highest point of the arc-shaped contact surface to the two sides of the dovetail piece and the upper end surface of the lower base, so that the lubricating oil fully covers the contact surface between the upper base and the lower base, avoiding direct contact between the surfaces of the upper base and the lower base, and reducing the wear of the upper base and the lower base.

[0019] Optionally, a reinforcement member is fixedly connected to the second abutting portion, and the reinforcement member is arranged at the connection between the second abutting portion and the upper base.

[0020] By adopting the above technical scheme, the guide body drives the upper base to move toward the conveying direction of the rolled piece, and the second pressing part on the upper base is pressed against the lower base. The second pressing part is easily broken due to the force, and a reinforcement piece is provided at the connection between the second pressing part and the upper base, which strengthens the connection strength between the second pressing part and the upper base and extends the service life of the second pressing part.

[0021] Optionally, a cover plate covering the gap between the dovetail protrusion and the first abutting portion is magnetically fixed to the dovetail protrusion.

[0022] By adopting the above technical solution, the gap between the dovetail protrusion and the first pressing part is covered with a cover plate to prevent dust, iron filings, etc. from entering the fitting surface between the dovetail protrusion and the first pressing part, affecting the degree of pressing between the dovetail protrusion and the first pressing part, thereby ensuring the stability of the position of the guide body and allowing the guide body to guide the rolled piece to enter and exit correctly.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The dovetail piece is matched with the dovetail groove, thereby limiting the movement of the upper base and the lower base along the width direction of the dovetail piece and along the vertical height direction of the dovetail piece. The dovetail protrusion is pressed against the first abutting part, limiting the movement of the upper base and the guide body along the conveying direction of the rolled piece, ensuring the stability of the guide body on the rolling mill. The angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is an acute angle, which strengthens the degree of abutment between the dovetail protrusion and the first abutting part. When the guide body needs to be replaced, it is only necessary to slide the upper base and the guide body away from the conveying direction of the rolled piece, and the dovetail piece slides out of the dovetail groove to complete the removal of the guide body. The installation and removal process are convenient and fast, and no tools are required, which saves time for steel rolling production. 2. The angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is set to 45°, so as to avoid the angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base being too large, so that the contact between the dovetail protrusion and the first abutting part and the surface of the lower base will be too sharp, which will accelerate the damage of the first abutting part. It is also avoided that the angle formed between the dovetail protrusion and the abutting surface of the first abutting part and the surface of the lower base is too small, so that the degree of abutment between the dovetail protrusion and the first abutting part is weakened, thereby reducing the stability of the guide body installed on the rolling mill, which not only ensures the stability of the guide body installation, but also avoids the first abutting part from being damaged too quickly; 3. The first clamping part and the lower base are arranged to be detachably connected. As the first clamping part is continuously subjected to force, the locking assembly in the through hole will become loose, and the gap between the lower end face of the first clamping part and the surface of the lower base will change accordingly, so that the degree of separation of the first clamping part from the lower base can be observed from the gap between the lower end face of the first clamping part and the lower base, thereby facilitating the preparation of a replacement first clamping part in advance, and the lower base can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application, which is used to show the positional relationship between the guide body installed on the upper base and the lower base; Figure 2 A schematic diagram of the structure of the second abutting portion and the third abutting portion provided in the embodiment of the present application, for illustrating the positional relationship between the second abutting portion and the third abutting portion; Figure 3 A partial cross-sectional view of the second abutting portion and the third abutting portion is provided for the embodiment of the present application, and is used to show the positional relationship of the dovetail piece in the dovetail groove; Figure 4 The embodiment of the present application is provided with a partial exploded schematic diagram of the second pressing portion and the third pressing portion, which is used to show the positional relationship of the dovetail member on the lower base.

[0025] Figure numerals: 1. inlet guide; 2. guide body; 3. upper base; 4. lower base; 5. dovetail block; 6. dovetail groove; 7. dovetail protrusion; 8. first tightening part; 9. placement groove; 10. oil guide hole; 11. arc-shaped contact surface; 12. through hole; 13. locking assembly; 14. bolt; 15. nut; 16. cover plate; 17. second tightening part; 18. third tightening part; 19. reinforcing rib; 20. oil storage chamber. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-4 This application is described in further detail.

[0027] Example: An easy-to-disassemble imported guide, reference Figure 1 The inlet guide 1 includes a guide body 2, an upper base 3, and a lower base 4 arranged in sequence from top to bottom. The guide body 2, the upper base 3, and the lower base 4 are all made of cast iron to ensure that the inlet guide 1 has good wear resistance and high strength. The guide body 2 is fixedly connected to the upper base 3. In this embodiment, the guide body 2 is fixed to the upper base 3 by welding, and then combined with Figure 3 One end of the lower base 4 protrudes to form a dovetail piece, which is a dovetail block 5 protruding from the lower base 4. The cross-sectional area of ​​the dovetail block 5 along the width direction of the lower base 4 is dovetail-shaped, and the dovetail block 5 is extended along the conveying direction of the rolled piece and is arranged on the upper end surface of the lower base 4. The bottom surface of the upper base 3 is recessed to form a dovetail groove 6 that slides with the dovetail block 5. The dovetail block 5 is adapted to the dovetail groove 6 in shape and size and is arranged in corresponding positions. When the upper base 3 welded with the guide body 2 is installed on the lower base 4, the dovetail block 5 fits with the inner wall of the dovetail groove 6, which limits the movement of the upper base 3 and the lower base 4 along the width direction of the dovetail block 5 and along the vertical height direction of the dovetail block 5. After the upper base 3 is completely installed on the lower base 4, the upper base 3 and the lower base 4 are tightly pressed against each other.

[0028] refer to Figure 2 and Figure 3 One end of the upper base 3 is protruded to form a dovetail protrusion 7, and the dovetail protrusion 7 is arranged at the end of the upper base 3 facing the conveying direction of the rolled piece. One end of the lower base 4 is protruded to form a first tightening portion 8, and a placement groove 9 for the dovetail protrusion 7 to enter is formed between the first tightening portion 8 and the surface of the lower base 4. The inner wall of the placement groove 9 is in contact with the dovetail protrusion 7. The dovetail protrusion 7 is pressed against the first tightening portion 8 to achieve the upper base 3 and the lower base 4 being pressed against each other, thereby limiting the movement of the upper base 3 and the guide body 2 along the conveying direction of the rolled piece, enhancing the stability of the guide body 2, and thereby ensuring that the guide body 2 can guide the rolled piece to enter and exit correctly, protect the rolling mill and the rolled piece, and improve the quality of the product.

[0029] refer to Figure 2The angle formed between the dovetail protrusion 7 and the abutting surface of the first abutting portion 8 and the surface of the lower base 4 is an acute angle of 45°. The acute angle formed can strengthen the abutment between the dovetail protrusion 7 and the first abutting portion 8, thereby strengthening the stability of the guide body 2 on the lower base 4. The angle formed is 45 degrees, which prevents the dovetail protrusion 7 from easily detaching from the first abutting portion 8 due to an excessively large angle, thereby weakening the abutment between the dovetail protrusion 7 and the first abutting portion 8, and also prevents the dovetail protrusion 7 from being too sharp due to an excessively small angle, thereby accelerating the damage of the first abutting portion 8.

[0030] refer to Figure 2 and Figure 3 The upper surface of the upper base 3 is provided with a plurality of oil guide holes 10, and the oil guide holes 10 are arranged on the upper base 3, and the oil guide holes 10 are connected with the dovetail groove 6, and the lubricating liquid can enter the dovetail groove 6 along the oil guide holes 10, and enter the contact surface between the dovetail block 5 and the dovetail groove 6, reducing the wear between the inner wall of the dovetail groove 6 and the dovetail block 5, and the contact surface between the top surface of the dovetail block 5 and the inner wall of the dovetail groove 6 is an arc-shaped contact surface 11, and the arc-shaped contact surface 11 is in a state of being high in the middle and low on both sides, and the oil guide holes 10 are located at the highest point of the arc-shaped contact surface 11, so that the lubricating oil flows from the highest point of the arc-shaped contact surface 11 to the two sides of the dovetail block 5, and then flows to the upper surface of the lower base 4, so that the upper base 3 and the lower base 4 are connected. The contact areas of the base 4 are covered with lubricating oil to avoid direct contact between the surfaces of the upper base 3 and the lower base 4, thereby reducing friction. An oil storage chamber 20 is formed between the dovetail of the dovetail groove 6 and the dovetail block 5 to avoid frequent addition of lubricating oil, thereby ensuring that the contact surface between the upper base 3 and the lower base 4 is continuously covered with lubricating oil. During the relative sliding of the upper base 3 and the lower base 4, the lubricating oil can absorb heat and reduce the temperature of the contact surface, and the lubricating oil fills the gap between the upper base 3 and the lower base 4. The lubricating oil has a certain viscosity to prevent impurities such as dust and iron filings from entering the contact surface between the upper base 3 and the lower base 4, thereby further enhancing the fitting effect between the upper base 3 and the lower base 4.

[0031] refer to Figure 2 and Figure 4The upper base 3 is tightly pressed against the first pressing part 8 on the lower base 4 through the dovetail protrusion 7. The connection between the first pressing part 8 and the lower base 4 is subjected to the greatest force. The first pressing part 8 is easily broken from the lower base 4. The first pressing part 8 is detachably connected to the lower base 4, which is convenient for replacing the first pressing part 8. A connecting through hole 12 is provided on the first pressing part 8 and the lower base 4. A locking assembly 13 is provided in the through hole 12. In this embodiment, the locking assembly 13 is a bolt 14 and a nut 15. The bolt 14 is passed through the first pressing part 8 and the lower base 4, and the nut 15 is threadedly connected to the passing end of the bolt 14. The bolt 14 and the nut 15 are threadedly locked, thereby realizing the locking between the first pressing part 8 and the lower base 4. As the rolled piece is transported, The first tightening part 8 is continuously stressed, the nut 15 becomes loose, the bolt 14 moves upward along the through hole 12, and the gap between the first tightening part 8 and the surface of the lower base 4 gradually increases, so that the looseness of the first tightening part 8 can be observed from the gap between the first tightening part 8 and the surface of the lower base 4 in time, and then the first tightening part 8 to be replaced can be prepared. After replacing the first tightening part 8, the lower base 4 can be reused, and a cover plate 16 is magnetically attracted on the dovetail protrusion 7, and the cover plate 16 is arranged in the gap between the first tightening part 8 and the dovetail protrusion 7. The cover plate 16 is made of a magnetic material, so that the cover plate 16 can be stably adsorbed on the first tightening part 8 and the dovetail protrusion 7 to prevent impurities from entering and affecting the fitting and tightening effect of the dovetail protrusion 7 and the first tightening part 8.

[0032] refer to Figure 2 and Figure 4 The upper base 3 is protruded from one end away from the first tightening portion 8 to form a second tightening portion 17, and the lower base 4 is protruded to form a third tightening portion 18 that fits tightly with the second tightening portion 17, further enhancing the stability of the guide body 2. The angle between the third tightening portion 18 and the tightening surface of the second tightening portion 17 and the top surface of the lower base 4 is an acute angle, which enhances the degree of tightening between the second tightening portion 17 and the lower base 4. The first tightening portion 8 and the second tightening portion 17 are respectively arranged at both ends of the upper base 3 extending in the length direction, so as to prevent the guide body 2 from deviating along the length direction of the dovetail block 5. , ensuring the stability of the guide body 2 installed on the rolling mill, a plurality of reinforcement members are fixed on the second clamping portion 17. In the present embodiment, the reinforcement member is a reinforcement rib 19, which is extended along the length direction of the upper base 3 and arranged on the second clamping portion 17. The reinforcement rib 19 is fixed to the second clamping portion 17 by welding. The reinforcement rib 19 is arranged at the connection between the second clamping portion 17 and the upper base 3, which strengthens the connection strength between the second clamping portion 17 and the upper base 3, avoids the second clamping portion 17 from breaking off from the upper base 3, and prolongs the service life of the second clamping portion 17.

[0033] The implementation principle of the embodiment of the present application is as follows: when installing the inlet guide 1, the guide body 2 is first welded to the upper base 3, and then the upper base 3 welded with the guide body 2 is installed on the lower base 4, the dovetail block 5 slides in the dovetail groove 6 along the conveying direction of the rolled piece, limiting the movement of the upper base 3 and the lower base 4 along the width direction of the dovetail block 5 and along the vertical height direction of the dovetail block 5, the dovetail protrusion 7 of the upper base 3 enters the placement groove 9 and abuts against the first abutting portion 8 on the lower base 4, limiting the upper base The seat 3 and the guide body 2 move along the conveying direction of the rolled piece, and the first tightening portion 8 is detachably connected to the lower base 4 through the locking assembly 13, which is convenient for replacing the first tightening portion 8. The second tightening portion 17 of the upper base 3 and the third tightening portion 18 of the lower base 4 are tightly fitted and pressed, thereby enhancing the stability of the guide body 2. When the guide body 2 needs to be removed, the upper base 3 is moved away from the conveying direction of the rolled piece until the dovetail block 5 completely slides out of the dovetail groove 6, and the guide body 2 can be quickly removed.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An inlet guide that is easy to disassemble, comprising a guide body (2), an upper base (3) fixed to the bottom of the guide body (2), and a lower base (4) arranged at the bottom of the upper base (3), characterized in that: The lower base (4) is formed with a dovetail piece extending along the conveying direction of the rolled piece, the upper base (3) is formed with a dovetail groove (6) slidably matched with the dovetail piece, one end of the upper base (3) is formed with a dovetail protrusion (7) extending in the conveying direction of the rolled piece, the lower base (4) is provided with a first abutting portion (8) abutting against the dovetail protrusion (7), a placement groove (9) abutting against the dovetail protrusion (7) is formed between the first abutting portion (8) and the lower base (4), and the angle formed between the abutting surface of the dovetail protrusion (7) and the first abutting portion (8) and the surface of the lower base (4) is an acute angle.

2. The easily disassembled inlet guide according to claim 1, characterized in that: The angle formed between the dovetail protrusion (7), the abutting surface of the first abutting portion (8) and the surface of the lower base (4) is 45°.

3. The easily disassembled inlet guide according to claim 1, characterized in that: The upper base (3) is protrudingly formed with a second abutting portion (17) abutting against the lower base (4); the second abutting portion (17) and the first abutting portion (8) are respectively arranged at two ends of the upper base (3) extending along the length direction.

4. The easily disassembled inlet guide according to claim 3, characterized in that: The lower base (4) is protrudingly formed with a third abutting portion (18) that is in close contact with the second abutting portion (17), and the angle between the abutting surfaces of the third abutting portion (18) and the second abutting portion (17) and the top surface of the lower base (4) is an acute angle.

5. The easily disassembled inlet guide according to claim 1, characterized in that: The first abutting portion (8) is detachably connected to the lower base (4); a communicating through hole (12) is provided on the first abutting portion (8) and the lower base (4); a locking assembly (13) for locking the first abutting portion (8) and the lower base (4) is provided in the through hole (12).

6. The easily disassembled inlet guide according to claim 1, characterized in that: The upper base (3) is provided with an oil guide hole (10) connected to the dovetail groove (6); the contact surface between the top surface of the dovetail piece and the inner wall of the dovetail groove (6) is an arc-shaped contact surface (11); and an oil storage cavity (20) is formed between the dovetail of the dovetail groove (6) and the dovetail piece.

7. The easily disassembled inlet guide according to claim 3, characterized in that: A reinforcing member is fixedly connected to the second abutting portion (17), and the reinforcing member is arranged at the connection between the second abutting portion (17) and the upper base (3).

8. The easily disassembled inlet guide according to claim 1, characterized in that: A cover plate (16) covering the gap between the dovetail protrusion (7) and the first abutting portion (8) is magnetically fixed on the dovetail protrusion (7).

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