CN217247775U

CN217247775U - SCR denitration device for cement plant kiln tail nitrogen oxide treatment

Info

Publication number: CN217247775U
Application number: CN202220309714.0U
Authority: CN
Inventors: 李现昌
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-08-23
Anticipated expiration: 2032-02-16

Abstract

The utility model discloses a SCR denitrification facility for cement plant kiln tail nitrogen oxide is administered, it includes the SCR denitration device body to take off the round pin device body, the SCR takes off the round pin device body and includes the SCR reactor, the left side top intercommunication of SCR reactor is fixed with first intake pipe, the left end intercommunication of first intake pipe is fixed with circular filter cartridge, and circular filter cartridge's bottom fixed mounting has the base, and circular filter cartridge's left side sets up to opening and fixedly connected with baffle, and the left side of baffle is inlayed and is equipped with the second intake pipe. The utility model discloses a twice filterable mode can effectually carry out filtration treatment to the dust in the flue gas, improves the filter effect, and is convenient for filter the clearance in turn to two first filter screens and two active carbon filter screens, through the mode of filtering the clearance in turn fast, need not stop the work of admitting air, reaches the purpose that can clear up the clearance of filterable dust impurity fast and shift out when not shutting down, saves shut down latency, improves work efficiency.

Description

SCR denitration device for cement plant kiln tail nitrogen oxide treatment

Technical Field

The utility model relates to a SCR denitration device technical field especially relates to a SCR denitrification facility for cement plant kiln tail nitrogen oxide is administered.

Background

The cement can generate a large amount of nitrogen oxides in the production process to pollute the atmospheric environment, ultralow emission is gradually realized in the power industry in China, the non-power industry including the cement industry becomes the key point of the next-stage atmospheric pollution treatment, and many places require the cement industry to realize ultralow emission, so that nitrogen oxide pollution gas discharged from the kiln tail of a cement plant needs to be subjected to SCR denitration treatment before being discharged, and an SCR denitration device is required; the existing SCR denitration device is inconvenient for carrying out effective filtering treatment on dust in kiln tail smoke of a cement plant before denitration, because the dust concentration of the kiln smoke of the cement plant is high, if the smoke directly enters an SCR denitration system, the blockage, abrasion and poisoning of a catalyst are easily caused, the usage amount of the catalyst is increased and the service life of the catalyst is shortened, although the purpose of filtering the dust in the smoke is realized by installing a filter screen at the end part of an air inlet pipe in the prior art, most of the smoke does not have the defect of cleaning and moving out the filtered dust impurities without shutdown, the smoke is used for a long time, personnel are required to shut down to clean the filtered dust impurities, the mode of shutdown cleaning is adopted, the work efficiency is reduced, the use requirement cannot be met, and therefore the SCR denitration device for the cement plant tail nitrogen oxides is provided for solving the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing the SCR denitration device for the treatment of the nitrogen oxide at the tail of the kiln of the cement plant.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the SCR denitration device for treating nitrogen oxides at the tail of a cement plant comprises an SCR denitration device body, wherein the SCR denitration device body comprises an SCR reactor, the top of the left side of the SCR reactor is communicated and fixed with a first air inlet pipe, the left end of the first air inlet pipe is communicated and fixed with a circular filter box, the bottom of the circular filter box is fixedly provided with a base, the left side of the circular filter box is provided with an opening and is fixedly connected with a baffle plate, the left side of the baffle plate is embedded with a second air inlet pipe, a circular block is movably sleeved in the circular filter box in a sealing manner, two rectangular grooves are formed in the left side of the circular block, the rectangular grooves positioned above the circular block are communicated with the second air inlet pipe, the inner wall of the right side of each rectangular groove is provided with an air outlet, the air outlet positioned above the rectangular grooves are communicated with the first air inlet pipe, a filter assembly is movably sleeved in each rectangular groove, and the filter assemblies are magnetically clamped in the corresponding rectangular grooves, the access hole has been seted up to the left side bottom of baffle, the access hole is linked together with the rectangular channel of below, the equal fixedly connected with pivot in both sides central point position of circular piece, the sealed rotation cover of circular filter cartridge is established in the pivot on right side, the sealed rotation cover of baffle is established in the pivot on left side, the right-hand member of the pivot on right side extends to the right side of circular filter cartridge and fixedly connected with rotary driving mechanism, rotary driving mechanism's top fixedly connected with guiding mechanism, the bottom fixed connection of guiding mechanism and first intake pipe, the right side fixedly connected with installation piece of circular filter cartridge, the top of installation piece is rotated and is installed screw thread actuating mechanism, the bottom fixedly connected with driving motor of installation piece, driving motor's output shaft top and screw thread actuating mechanism's bottom fixed connection, rotary driving mechanism's bottom and screw thread actuating mechanism's top fixed connection, screw thread actuating mechanism rotates the bottom of installing at guiding mechanism.

Preferably, the filter assembly includes that sealed movable sleeve establishes the first filter screen in the rectangular channel, the right side fixed mounting of first filter screen has two connecting rods, be located the same active carbon filter screen of right-hand member fixedly connected with of two connecting rods on the same first filter screen, the sealed movable sleeve of active carbon filter screen establishes in the rectangular channel that corresponds, equal fixedly connected with mounting box on the top inner wall of rectangular channel and the bottom inner wall, two first magnets of right side fixedly connected with of active carbon filter screen, fixedly connected with second magnet on the right side inner wall of mounting box, the right side of first magnet extends to in the mounting box that corresponds and adsorbs mutually with the left side of second magnet, the inner wall of mounting box and the outside movable contact of the first magnet that corresponds, the left side fixedly connected with pull ring of first filter screen.

Preferably, the rotary driving mechanism comprises a gear, the left side of the gear is fixedly connected with the right end of the right rotating shaft, and the rear side of the gear is meshed with a rack.

Preferably, the guide mechanism comprises a first moving block, the bottom of the first moving block is fixedly connected with the top end of the rack, the bottom of the first air inlet pipe is fixedly connected with a guide rod, and the first moving block is slidably sleeved on the guide rod.

Preferably, the thread driving mechanism comprises a screw rotatably mounted at the top of the mounting block, the top end of an output shaft of the driving motor is fixedly connected with the bottom end of the screw, the top end of the screw is rotatably mounted with the bottom end of the guide rod, a second moving block is sleeved on the screw in a threaded manner, the top of the second moving block is fixedly connected with the bottom end of the rack, and the second moving block is slidably mounted on the right side of the circular filter box.

Preferably, circular holes are formed in the inner wall of the right side of the circular filter box and the left side of the baffle, two sealing bearings are fixedly sleeved in the circular holes, and the inner ring of each sealing bearing is fixedly connected with the outer side of the corresponding rotating shaft.

Preferably, a rectangular through hole is formed in the top of the first moving block, and the inner wall of the rectangular through hole is connected with the outer side of the guide rod in a sliding mode.

Preferably, the bottom of the right side of the circular filter box is provided with a first groove, a T-shaped sliding rail is fixedly connected to the inner wall of the left side of the first groove, a T-shaped sliding groove with the top and the bottom being provided with an opening is formed in the left side of the second moving block, the T-shaped sliding rail is connected with the T-shaped sliding groove in a sliding mode, a threaded hole is formed in the top of the second moving block, and the threaded hole is connected with the screw in a threaded mode.

Preferably, the top end of the screw is fixedly connected with a first bearing, and the inner side of an inner ring of the first bearing is fixedly connected with the outer side of the guide rod.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a twice filterable mode can effectually carry out filtration treatment to the dust in the flue gas, improves the filter effect, and is convenient for filter the clearance in turn two first filter screens and two active carbon filter screens, through the mode of filtering the clearance in turn fast, need not stop the work of admitting air, reaches the purpose that can clear up the filterable dust impurity fast and shift out in the time of not shutting down, sparingly shuts down latency, improves work efficiency.

Drawings

FIG. 1 is a schematic structural view of an SCR denitration device for treating nitrogen oxides at the tail of a cement plant;

fig. 2 is a schematic sectional structure view of fig. 1.

In the figure: 100. an SCR reactor; 101. a first intake pipe; 1. a circular filter cartridge; 2. a second intake pipe; 3. a baffle plate; 4. a circular block; 5. a rectangular groove; 6. a first filter screen; 7. an activated carbon filter screen; 8. an air outlet; 9. a discharge hole; 10. a rotating shaft; 11. a gear; 12. a rack; 13. a guide rod; 14. a second moving block; 15. a screw; 16. a drive motor; 17. a first moving block; 18. a connecting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-2, the SCR denitration device for nitrogen oxide treatment of cement plant kiln comprises an SCR denitration device body, the SCR denitration device body comprises an SCR reactor 100, a first air inlet pipe 101 is communicated and fixed at the top of the left side of the SCR reactor 100, a circular filter box 1 is communicated and fixed at the left end of the first air inlet pipe 101, a base is fixedly installed at the bottom of the circular filter box 1, the left side of the circular filter box 1 is provided with an opening and is fixedly connected with a baffle 3, a second air inlet pipe 2 is embedded at the left side of the baffle 3, a circular block 4 is hermetically and movably sleeved in the circular filter box 1, two rectangular grooves 5 are formed at the left side of the circular block 4, the rectangular grooves 5 positioned above are communicated with the second air inlet pipe 2, air outlet holes 8 are formed in the inner wall of the right side of the rectangular grooves 5, the air outlet holes 8 positioned above are communicated with the first air inlet pipe 101, a filter assembly is movably sleeved in the rectangular grooves 5, the filtering component is magnetically clamped in a corresponding rectangular groove 5, a taking hole 9 is formed in the bottom of the left side of the baffle plate 3, the taking hole 9 is communicated with the rectangular groove 5 below, rotating shafts 10 are fixedly connected to the central positions of the two sides of the circular block 4, the circular filtering box 1 is sleeved on the rotating shaft 10 on the right side in a sealing manner, the baffle plate 3 is sleeved on the rotating shaft 10 on the left side in a sealing manner, the right end of the rotating shaft 10 on the right side extends to the right side of the circular filtering box 1 and is fixedly connected with a rotary driving mechanism, a guide mechanism is fixedly connected to the top of the rotary driving mechanism and is fixedly connected with the bottom of the first air inlet pipe 101, an installation block is fixedly connected to the right side of the circular filtering box 1, a thread driving mechanism is rotatably installed on the top of the installation block, a driving motor 16 is fixedly connected to the bottom of the installation block, and the top end of an output shaft of the driving motor 16 is fixedly connected with the bottom end of the thread driving mechanism, the bottom end of the rotary driving mechanism is fixedly connected with the top of the thread driving mechanism, and the thread driving mechanism is rotatably arranged at the bottom end of the guide mechanism;

the filter assembly comprises a first filter screen 6 which is sleeved in the rectangular groove 5 in a sealing movable manner, two connecting rods 18 are fixedly installed on the right side of the first filter screen 6, the right ends of the two connecting rods 18 positioned on the same first filter screen 6 are fixedly connected with the same activated carbon filter screen 7, the activated carbon filter screen 7 is sleeved in the corresponding rectangular groove 5 in a sealing movable manner, mounting boxes are fixedly connected to the inner wall of the top and the inner wall of the bottom of the rectangular groove 5, two first magnets are fixedly connected to the right side of the activated carbon filter screen 7, a second magnet is fixedly connected to the inner wall of the right side of the mounting box, the right side of the first magnet extends into the corresponding mounting box and is adsorbed to the left side of the second magnet, the inner wall of the mounting box is in movable contact with the outer side of the corresponding first magnet, and a pull ring is fixedly connected to the left side of the first filter screen 6;

the rotary driving mechanism comprises a gear 11, the left side of the gear 11 is fixedly connected with the right end of the right rotating shaft 10, and a rack 12 is meshed with the rear side of the gear 11;

the guide mechanism comprises a first moving block 17, the bottom of the first moving block 17 is fixedly connected with the top end of the rack 12, the bottom of the first air inlet pipe 101 is fixedly connected with a guide rod 13, and the first moving block 17 is slidably sleeved on the guide rod 13;

the screw thread driving mechanism comprises a screw rod 15 which is rotatably arranged at the top of an installation block, the top end of an output shaft of a driving motor 16 is fixedly connected with the bottom end of the screw rod 15, the top end of the screw rod 15 is rotatably arranged with the bottom end of a guide rod 13, a second moving block 14 is sleeved on the screw thread of the screw rod 15, the top end of the second moving block 14 is fixedly connected with the bottom end of a rack 12, and the second moving block 14 is slidably arranged at the right side of the circular filter box 1. the utility model can effectively filter dust in smoke by a twice filtering mode, improves the filtering effect, and is convenient for alternately filtering two first filter screens 6 and two activated carbon filter screens 7, through the mode of filtering the clearance fast in turn, need not stop the work of admitting air, reach the purpose that can clear up the clearance of filterable dust impurity and shift out fast when not shutting down, save the shut down latency, improve work efficiency.

In the utility model, the inner wall of the right side of the circular filter box 1 and the left side of the baffle 3 are both provided with circular holes, the circular holes are internally and fixedly sleeved with two sealing bearings, the inner sides of the inner rings of the sealing bearings are fixedly connected with the outer sides of the corresponding rotating shafts 10, the top of the first movable block 17 is provided with a rectangular perforation, the inner wall of the rectangular perforation is in sliding connection with the outer side of the guide rod 13, the bottom of the right side of the circular filter box 1 is provided with a first groove, the inner wall of the left side of the first groove is fixedly connected with a T-shaped slide rail, the left side of the second movable block 14 is provided with a T-shaped slide groove with the top and the bottom arranged as openings, the T-shaped slide rail is in sliding connection with the T-shaped slide groove, the top of the second movable block 14 is provided with a threaded hole, the threaded hole is in threaded connection with the screw rod 15, the top of the screw rod 15 is fixedly connected with the first bearing, the inner sides of the inner rings of the first bearing are fixedly connected with the outer side of the guide rod 13, the utility model discloses a twice filtering mode, can be effectual carry out filtration treatment to the dust in the flue gas, improve the filter effect, and be convenient for filter the clearance in turn to two first filter screens 6 and two active carbon filter screens 7, through the mode of filtering the clearance in turn fast, need not stop the work of admitting air, reach can be when not shutting down fast to the purpose that filterable dust impurity clearance shifted out, save the latency of shutting down, improve work efficiency.

The working principle is as follows: when the device is used, during filtering, the second air inlet pipe 2 is connected with a smoke exhaust end of a kiln tail of a cement plant, smoke enters the rectangular groove 5 above through the second air inlet pipe 2, the smoke sequentially passes through the first filter screen 6 above, the activated carbon filter screen 7 above, the air outlet hole 8 above and the first air inlet pipe 101 and enters the SCR reactor 100, the first filter screen 6 above performs first filtering on dust in the smoke, the activated carbon filter screen 7 above performs second filtering adsorption on the dust in the smoke, and the dust in the smoke can be effectively filtered and treated in a twice filtering mode, so that the filtering effect is improved;

along with long-time filtration, when the first filter screen 6 above and the activated carbon filter screen 7 above need to be taken out for cleaning, the driving motor 16 is started in the forward direction, the output shaft of the driving motor 16 drives the screw rod 15 to rotate, under the action of the threaded hole formed in the second moving block 14, the screw rod 15 rotates to drive the second moving block 14 to move downwards, the second moving block 14 drives the rack 12 to move downwards, the rack 12 drives the first moving block 17 to slide downwards on the guide rod 13, the rack 12 drives the gear 11 engaged with the rack to rotate, the gear 11 drives the rotating shaft 10 on the right side to rotate, the rotating shaft 10 on the right side drives the circular block 4 to rotate in the circular filter box 1, the circular block 4 drives the rotating shaft 10 on the left side to rotate, the circular block 4 drives the first filter screen 6 above and the activated carbon filter screen 7 above to rotate to the lower side, the circular block 4 also drives the first filter screen 6 below and the activated carbon filter screen 7 below to rotate to the upper side, at the moment, the gas changes to sequentially pass through the first filter screen 6, the activated carbon filter screen 7 and the gas outlet hole 8 which are positioned above the moment and enter the first gas inlet pipe 101, then the gas can be pulled through the taking hole 9 to pull the pull ring which is positioned below the moment, the pull ring which is positioned below the moment drives the first filter screen 6 to move out from the rectangular groove 5 which is positioned below the moment to the left, the first filter screen 6 which is positioned below the moment drives the activated carbon filter screen 7 which is positioned below the moment to move out from the rectangular groove 5 which is positioned below the moment through the two connecting rods 18 which are positioned below the moment, the activated carbon filter screen 7 which is positioned below the moment drives the corresponding first magnet to be separated from the second magnet, the first filter screen 6 which is positioned below the moment can carry out the filtered dust and impurities while moving left, the first filter screen 6 which is positioned below the moment can be taken out for cleaning, and the activated carbon filter screen 7 and the first filter screen 6 which move to the right after cleaning move to the rectangular groove 5 below the moment, the activated carbon filter screen 7 below moves rightwards and simultaneously drives the two corresponding first magnets to adsorb the two second magnets, and the installation is finished;

when first filter screen 6 and the active carbon filter screen 7 that lie in the top when this need take out the clearance with the principle, but reverse start driving motor 16, opposite with the motion process of forward start driving motor 16 with the principle, make first filter screen 6 and the active carbon filter screen 7 of top rotate to the below, first filter screen 6 and the active carbon filter screen 7 of below rotate to the top, can take out the clearance to first filter screen 6 and the active carbon filter screen 7 that lie in the below this moment, thereby can realize filtering the purpose of clearance in turn to two first filter screens 6 and two active carbon filter screens 7, through the mode of filtering clearance in turn fast, need not stop the work of admitting air, reach the mesh that can clear up the shifted out to filterable dust impurity fast when not shutting down, save down latency, improve work efficiency.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The SCR denitration device for treating nitrogen oxides at the tail of a kiln of a cement plant comprises an SCR denitration device body, wherein the SCR denitration device body comprises an SCR reactor (100), the top of the left side of the SCR reactor (100) is communicated and fixed with a first air inlet pipe (101), the SCR denitration device is characterized in that the left end of the first air inlet pipe (101) is communicated and fixed with a circular filter box (1), a base is fixedly arranged at the bottom of the circular filter box (1), the left side of the circular filter box (1) is provided with an opening and is fixedly connected with a baffle (3), a second air inlet pipe (2) is embedded in the left side of the baffle (3), a circular block (4) is movably sleeved in the circular filter box (1) in a sealing way, two rectangular grooves (5) are formed in the left side of the circular block (4), the rectangular grooves (5) positioned above are communicated with the second air inlet pipe (2), an air outlet hole (8) is formed in the inner wall of the right side of the rectangular groove (5), an air outlet (8) positioned above is communicated with a first air inlet pipe (101), a filtering component is movably sleeved in a rectangular groove (5), the filtering component is magnetically clamped in the corresponding rectangular groove (5), a taking hole (9) is formed in the bottom of the left side of a baffle plate (3), the taking hole (9) is communicated with the rectangular groove (5) below, rotating shafts (10) are fixedly connected to the central positions of two sides of a circular block (4), the circular filtering box (1) is sleeved on the rotating shaft (10) on the right side in a sealing and rotating manner, the baffle plate (3) is sleeved on the rotating shaft (10) on the left side in a sealing and rotating manner, the right end of the rotating shaft (10) on the right side extends to the right side of the circular filtering box (1) and is fixedly connected with a rotary driving mechanism, a guide mechanism is fixedly connected to the top of the rotary driving mechanism, the guide mechanism is fixedly connected to the bottom of the first air inlet pipe (101), and a mounting block is fixedly connected to the right side of the circular filtering box (1), the top of installation piece is rotated and is installed screw thread actuating mechanism, and the bottom fixedly connected with driving motor (16) of installation piece, the output shaft top of driving motor (16) and screw thread actuating mechanism's bottom fixed connection, the bottom of rotary driving mechanism and screw thread actuating mechanism's top fixed connection, screw thread actuating mechanism rotates and installs the bottom at guiding mechanism.

2. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln according to claim 1, wherein the filter assembly comprises a first filter screen (6) which is movably sleeved in the rectangular groove (5) in a sealing manner, two connecting rods (18) are fixedly installed at the right side of the first filter screen (6), the right ends of the two connecting rods (18) on the same first filter screen (6) are fixedly connected with the same activated carbon filter screen (7), the activated carbon filter screen (7) is movably sleeved in the corresponding rectangular groove (5) in a sealing manner, mounting boxes are fixedly connected on the inner walls at the top and the bottom of the rectangular groove (5), two first magnets are fixedly connected at the right side of the activated carbon filter screen (7), a second magnet is fixedly connected on the inner wall at the right side of the mounting box, the right side of the first magnet extends into the corresponding mounting box and is adsorbed with the left side of the second magnet, the inner wall of the mounting box is in movable contact with the outer side of the corresponding first magnet, and the left side of the first filter screen (6) is fixedly connected with a pull ring.

3. The SCR denitration device for the nitrogen oxide treatment at the tail of the kiln of the cement plant as claimed in claim 1, wherein the rotary driving mechanism comprises a gear (11), the left side of the gear (11) is fixedly connected with the right end of the rotating shaft (10) at the right side, and the rear side of the gear (11) is engaged with a rack (12).

4. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln as defined in claim 1, wherein the guide mechanism comprises a first moving block (17), the bottom of the first moving block (17) is fixedly connected with the top end of the rack (12), the bottom of the first air inlet pipe (101) is fixedly connected with a guide rod (13), and the first moving block (17) is slidably sleeved on the guide rod (13).

5. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln as defined in claim 1, wherein the screw thread driving mechanism comprises a screw (15) rotatably mounted at the top of the mounting block, the top end of an output shaft of a driving motor (16) is fixedly connected with the bottom end of the screw (15), the top end of the screw (15) is rotatably mounted with the bottom end of the guide rod (13), a second moving block (14) is sleeved on the screw (15) in a threaded manner, the top of the second moving block (14) is fixedly connected with the bottom end of the rack (12), and the second moving block (14) is slidably mounted at the right side of the circular filter box (1).

6. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln as defined in claim 1, wherein circular holes are formed in the inner wall of the right side of the circular filter box (1) and the left side of the baffle (3), two sealing bearings are fixedly sleeved in the circular holes, and the inner sides of the inner rings of the sealing bearings are fixedly connected with the outer sides of the corresponding rotating shafts (10).

7. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln as defined in claim 4, wherein a rectangular perforation is formed at the top of the first moving block (17), and the inner wall of the rectangular perforation is slidably connected with the outer side of the guide rod (13).

8. The SCR denitration device for nitrogen oxide treatment at the tail of a cement plant kiln as defined in claim 5, wherein a first groove is formed at the bottom of the right side of the circular filter box (1), a T-shaped slide rail is fixedly connected to the inner wall of the left side of the first groove, a T-shaped slide groove with an opening at the top and the bottom is formed at the left side of the second moving block (14), the T-shaped slide rail is slidably connected with the T-shaped slide groove, a threaded hole is formed at the top of the second moving block (14), and the threaded hole is in threaded connection with the screw (15).

9. The SCR denitration device for the treatment of nitrogen oxides at the tail of a cement plant kiln as defined in claim 5, wherein the top end of the screw (15) is fixedly connected with a first bearing, and the inner side of the inner ring of the first bearing is fixedly connected with the outer side of the guide rod (13).