CN210506455U - Centering machine and annealing furnace centering system using centering machine - Google Patents

Abstract

The utility model relates to a centering machine and application have this centering machine's annealing stove centering system relates to cast tube annealing equipment technical field, has the easy malfunctioning problem of sensor among the prior art, leads to annealing process in disorder stove problem easily to appear. The technical scheme includes that the device comprises a support, wherein a sliding track which is horizontally arranged is arranged on the support, a push rod seat is arranged in the sliding track in a sliding mode in a penetrating mode, a push rod is installed at one end of the push rod seat, a crank piece is connected to the support in a rotating mode, a driving piece used for driving the crank piece to rotate is installed on the support, and a rotating axis of the crank piece is horizontally arranged; a linkage piece for driving the push rod seat to slide back and forth along the length direction of the sliding track is connected between one end of the crank piece, which is far away from the rotation axis of the crank piece, and the push rod seat. The scheme can not be controlled by a sensor, and can realize blind alignment of the pipes, thereby reducing the occurrence probability of the furnace disorder accident.

Description

Centering machine and annealing furnace centering system using centering machine

Technical Field

The utility model belongs to the technical field of cast tube annealing equipment technique and specifically relates to a centering machine and application have this annealing stove centering system of centering machine is related to.

Background

In the field of metallurgy, annealing steps are often involved, in the production process of products such as pipes, bars and the like, one group or a plurality of groups of conveying mechanisms are needed to push the pipes to pass through an annealing furnace to realize annealing, in the conveying process, the hardness of the pipes is reduced due to high temperature, in order to ensure that the pipes can be kept round all the time in the whole conveying process, the pipes are continuously pushed to advance in a rolling mode, and if the pipes are easy to deform at high temperature, the cross sections of the pipes are oval;

in the prior art, referring to fig. 1 and 2, the conveying mechanism 8 comprises a chain wheel 81, a chain 82 connected to the chain wheel 81 and connected end to end, a plurality of chain claws 83 mounted on the chain 82 and arranged at equal intervals along the length direction of the chain 82, and a power member for driving the chain wheel 81 to rotate, wherein the chain 82 passes through the whole annealing furnace 7, and the prior art also comprises a guide rail 84, the guide rail 84 also passes through the annealing furnace 7 and is used for supporting the pipe 101, and the extending direction of the guide rail 84 is parallel to the conveying direction of the conveying mechanism 8; the pipe 101 can be clamped between two adjacent chain claws 83, the length direction of the pipe 101 is perpendicular to the conveying direction, and under the support of the guide rails 84 and the pushing and rolling of the chain claws 83, the pipe 101 passes through the annealing furnace 7 to finish annealing.

Because the outer pipe diameter of part of the pipe 101 is gradually increased or decreased along the axial direction of the pipe 101, namely the pipe 101 has a certain taper, the pipe 101 is easy to gradually deviate towards the axial direction of the pipe 101 in the process of being pushed and rolled, and the end part of the pipe 101 is seriously impacted to the wall of the annealing furnace 7, so that the quality of the pipe 101 and the service life of the annealing furnace 7 are influenced; in the prior art, a row of centering machines 9 are respectively additionally arranged on two sides outside an annealing furnace 7, a push rod 12 is arranged on each centering machine 9, the push rod 12 penetrates into the annealing furnace 7, and the centering machines 9 can drive the push rods 12 to realize reciprocating motion along the axial direction of the push rods 12, so that the pipe 101 is pushed and reset to a proper position;

in the prior art, the driving source of the centering machine 9 is generally a hydraulic cylinder 10 (refer to the application number 2017214792344 Chinese utility patent: a split centering bracket of the annealing furnace centering machine), the reciprocating movement of the push rod 12 is realized by the hydraulic cylinder, and the problems of slow reciprocating speed and long reciprocating period of the push rod 12 exist, so that it is necessary to accurately match the push operation of the push rod 12 to the position of the pipe 101, and actually, a sensor is often installed on the chain claw 83, and a plurality of sensors corresponding to the sensors on the chain claw 83 are also installed in the annealing furnace 7, so that the push operation of the push rod 12 is accurately matched to the position of the pipe 101.

Specifically, when the chain claw 83 pushing the pipe 101 passes through one of the centering machines 9, the corresponding centering machine 9 drives the push rod 12 to move inwards through signal transmission of the sensor, so that the pipe 101 is pushed and reset.

However, as is well known, the electronic component such as the sensor has a short service life in a high-temperature environment and is prone to malfunction, and further, the centering machine 9 may not be aligned in time and the push rod 12 may be pushed to move, and finally, furnace disorder accidents such as collision of the tube 101 with the furnace wall of the annealing furnace 7 may occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centering machine can not receive the control of sensor to can realize the blind right to tubular product, thereby reduce the emergence probability of indiscriminate stove accident.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a centering machine comprises a support, wherein a sliding track which is horizontally arranged is arranged on the support, a push rod seat is arranged in the sliding track in a sliding mode in a penetrating mode, a push rod is installed at one end of the push rod seat, a crank piece is connected to the support in a rotating mode, a driving piece used for driving the crank piece to rotate is installed on the support, and the rotating axis of the crank piece is horizontally arranged; a linkage piece for driving the push rod seat to slide back and forth along the length direction of the sliding track is connected between one end of the crank piece, which is far away from the rotation axis of the crank piece, and the push rod seat.

Through adopting above-mentioned technical scheme, the push rod is push rod seat promptly under the drive of parts such as crank spare, linkage, driving piece, can realize quick reciprocal flexible, is equivalent to every tubular product in the time of the promotion scope of certain push rod of route, and the push rod can produce pushing operation many times in succession, consequently need not like the accuracy that must guarantee push rod promotion at every turn among the prior art to can realize the blind right to tubular product, and the indiscriminate stove probability of greatly reduced.

Preferably: the push rod seat pushes the push rod outwards along the sliding track as a process, the push rod seat pulls the push rod inwards along the sliding track as a return stroke, and the average speed of the process is smaller than the average speed of the return stroke.

By adopting the technical scheme, the method has a quick return characteristic, and under the quick return characteristic, the process average speed is smaller than the return stroke average speed; when the push rod is pushed into the annealing furnace and pushes the pipe to reset, the impact of the push rod on the pipe can be reduced due to the slow progress characteristic so as to reduce the deformation probability of the pipe, and the single expansion period can be shortened due to the fast return stroke characteristic so as to improve the efficiency.

Preferably: the linkage piece includes rocker portion, even puts up pole portion, connecting rod portion, and rocker portion one end is rotated and is connected in support and other end and rotate and connect in connecting rod portion one end, and the connecting rod portion other end is rotated and is connected in the push rod seat, even puts up pole portion one end and rotates and connect in the crank piece and keep away from its rotation axis one end, even puts up pole portion other end and rotates and connect on the perisporium of rocker portion.

Through adopting above-mentioned technical scheme, rocker portion, support, even a pole portion, crank spare form the crank rocker structure jointly, and when driving piece drive crank spare rotated, the reciprocating motion can be realized to rocker portion, drives the ejector pin seat simultaneously and realizes reciprocating motion.

Preferably: the linkage piece is rod-shaped, one end of the linkage piece is rotatably connected to one end, far away from the rotation axis, of the crank piece, the other end of the linkage piece is rotatably connected to the push rod seat, and the distance between the connecting point of the linkage piece and the crank piece and the connecting point of the linkage piece and the push rod seat is larger than the distance between the connecting point of the crank piece and the linkage piece and the connecting point of the crank piece and the support.

Through adopting above-mentioned technical scheme, support, linkage piece, crank spare, push rod seat etc. have formed the slider-crank structure jointly, and when driving piece drive crank spare rotated, the reciprocating motion can be realized to the push rod seat.

Preferably: the bracket is provided with a left track beam and a right track beam which are arranged in parallel, and the sliding track is positioned between the left track beam and the right track beam; at least two main shafts are fixed on the push rod seat, the axes of the main shafts are perpendicular to the length direction of the sliding tracks, flat wheels and V-shaped wheels are respectively installed at two ends of each main shaft, a flat rail is installed on one of the left track beam and the right track beam, a V-shaped rail is installed on the other of the left track beam and the right track beam, and the flat wheels and the V-shaped wheels are respectively connected with the flat rails and the V-shaped rails.

By adopting the technical scheme, when the push rod seat moves along the sliding track, the flat wheels and the V-shaped wheels respectively roll relative to the flat rails and the V-shaped rails, and the V-shaped rails have a limiting effect on the V-shaped wheels, so that the push rod seat can only move along the length direction of the sliding track.

Preferably: and the left track beam and the right track beam are both H-shaped steel.

By adopting the technical scheme, the H-shaped steel can be widely obtained, and particularly certain H-shaped steel discarded in factory processing can be used, so that the processing cost of the bracket can be reduced.

Preferably: the flat wheel comprises two first bearings which are sleeved at the end part of the main shaft and are arranged at intervals, and a flat rolling sleeve which is sleeved outside the two first bearings and is abutted against the flat rail; the flat wheel also comprises a first spacer bush, and the first spacer bush is clamped between the two first bearings; an oil passage is formed in the main shaft and is provided with a plurality of outlet ends communicated with the outside, one or more outlet ends are communicated between the two first bearings, and one outlet end is communicated with the middle part of the main shaft;

the V-shaped wheel comprises two second bearings which are sleeved at the end part of the main shaft and are arranged at intervals, and V-shaped rolling sleeves which are sleeved outside the two second bearings and abut against the V-shaped rails; the V-shaped wheel also comprises a second spacer bush, and the second spacer bush is clamped between the two second bearings; wherein one or more outlet ports communicate between the two second bearings.

By adopting the technical scheme, lubricating oil can be injected between the two first bearings and between the two second bearings for an operator due to the arrangement of the characteristics such as the oil passage and the like, so that the service life is prolonged.

The utility model aims at providing an annealing stove centering system, because the push rod reciprocating speed of centering machine is very fast, then each centering machine can realize the blind right to tubular product to need not use the sensor, just also reduced indiscriminate stove probability.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the annealing furnace centering system comprises an annealing furnace and a conveying mechanism for conveying a pipe through the annealing furnace, wherein the conveying mechanism comprises a chain wheel, a chain, a plurality of chain claws and a power part, the chain is connected with the chain wheel and is connected with the chain wheel end to end, the chain claws are arranged on the chain and are arranged at equal intervals along the length direction of the chain, the power part is used for driving the chain wheel to rotate, and the chain penetrates through the whole annealing furnace; the guide rail penetrates through the annealing furnace and is used for supporting the pipe, and the extending direction of the guide rail is parallel to the conveying direction of the conveying mechanism; a row of centering machines are respectively arranged on two sides outside the annealing furnace, and the arrangement direction of each row of centering machines is parallel to the conveying direction of the conveying mechanism; and a push rod gap of the centering machine penetrates into the annealing furnace, and the length direction of the push rod is perpendicular to the conveying direction of the conveying mechanism.

By adopting the technical scheme, because the reciprocating speed of the push rod of the centering machine is high, blind alignment of the pipes can be realized by each centering machine, so that a sensor is not needed, and the probability of furnace disorder is reduced.

To sum up, the utility model discloses a beneficial technological effect does:

1. in the scheme, the push rods, namely the push rod seats, can realize quick reciprocating extension under the driving of the crank members, the linkage members, the driving members and other members, which is equivalent to that each pipe can continuously generate multiple pushing operations within the time of the pushing range of a certain push rod, so that the accuracy of pushing each push rod is not required to be ensured like the prior art, thereby realizing blind pairing of the pipes and greatly reducing the probability of furnace disorder;

2. in the scheme, the structure formed by the crank piece, the linkage piece, the bracket and other parts has a quick return characteristic, and under the quick return characteristic, the average speed of the process is less than the average speed of the return stroke; when the push rod is pushed into the annealing furnace and pushes the pipe to reset, the impact of the push rod on the pipe can be reduced due to the slow progress characteristic so as to reduce the deformation probability of the pipe, and the single expansion period can be shortened due to the fast return stroke characteristic so as to improve the efficiency.

Drawings

FIG. 1 is a schematic cross-sectional front view of a centering system of an annealing furnace in the background art.

FIG. 2 is a schematic side cross-sectional view of a prior art lehr centering system.

Fig. 3 is a schematic structural diagram according to the first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view at a-a in fig. 3, but without showing the cross-section of the rocker portion, the link portion.

Fig. 5 is a schematic view showing the structure of the components at the slide rail in fig. 4.

Fig. 6 is a schematic cross-sectional view at B-B in fig. 3.

Fig. 7 is a schematic structural diagram of the second embodiment of the present invention.

Fig. 8 is a schematic sectional view of the annealing furnace centering system according to the third embodiment of the present invention.

FIG. 9 is a schematic side sectional view of an annealing furnace centering system according to the third embodiment of the present invention.

In the figure, 1, a bracket; 11. a push rod seat; 12. a push rod; 13. a left track beam; 131. leveling a rail; 14. a right track beam; 141. a V-shaped rail; 15. a splint; 2. a crank member; 21. a drive member; 3. a linkage member; 31. a rocker section; 32. a frame connecting rod part; 33. a link section; 4. a main shaft; 41. an oil passage; 42. an oil cup; 5. a flat wheel; 51. a first bearing; 52. a flat rolling sleeve; 53. a first spacer sleeve; 6. a V-shaped wheel; 61. a second bearing; 62. a V-shaped roller sleeve; 63. a second spacer sleeve; 7. an annealing furnace; 8. a transport mechanism; 81. a sprocket; 82. a chain; 83. a chain claw; 84. a guide rail; 9. a centering machine; 10. a hydraulic cylinder; 101. a pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 3, a centering machine disclosed in this embodiment includes a support 1, a horizontally disposed sliding track is disposed on the support 1, a push rod seat 11 is slidably disposed in the sliding track, a push rod 12 is mounted at one end of the push rod seat 11 through a bolt, a crank member 2 is rotatably connected to the support 1, a driving member 21 for driving the crank member 2 to rotate is mounted on the support 1, a rotation axis of the crank member 2 is horizontally disposed, and the driving member 21 is a motor; a linkage part 3 is connected between one end of the crank part 2, which is far away from the rotation axis, and the push rod seat 11, under the driving of the driving part 21, the crank part 2 starts to rotate and drives the linkage part 3 to generate linkage, and the linkage part 3 can drive the push rod seat 11 to slide back and forth along the length direction of the sliding track, so that the push rod 12 can stretch back and forth.

Referring to fig. 3 and 4, the crank member 2 may be rod-shaped or disc-shaped; the linkage 3 comprises a rocker part 31, a connecting frame rod part 32 and a connecting rod part 33, one end of the rocker part 31 is rotatably connected to the bracket 1, the other end of the rocker part is rotatably connected to one end of the connecting rod part 33, the other end of the connecting rod part 33 is rotatably connected to one end, far away from the push rod 12, of the push rod seat 11, one end of the connecting frame rod part 32 is rotatably connected to one end, far away from the rotation axis of the crank part 2, of the crank part, and the other end of the connecting frame rod; therefore, the rocker part 31, the bracket 1, the connecting frame rod part 32 and the crank part 2 jointly form a crank-rocker structure, and when the driving part 21 drives the crank part 2 to rotate, the rocker part 31 can swing in a reciprocating manner and simultaneously drives the push rod seat 11 to move in a reciprocating manner. The connection of the rocker part 31 to the carrier 1 can be effected by means of bearings (see fig. 5), and the connection of the crank part 2 to the carrier rod part 32 can also be effected by means of bearings.

It is worth to be noted that the crank rocker structure has a quick return characteristic, the push rod seat 11 pushes the push rod 12 outwards along the sliding track as a process, the push rod seat 11 pulls the push rod 12 inwards along the sliding track as a return stroke, and under the quick return characteristic, the average speed of the process is smaller than the average speed of the return stroke; when the push rod 12 is pushed into the annealing furnace 7 and pushes the pipe 101 to reset, the slow progress characteristic can reduce the impact of the push rod 12 on the pipe 101 to reduce the deformation probability of the pipe 101, and the fast return characteristic can shorten the single expansion period to improve the efficiency.

Referring to fig. 4 and 5, a left track beam 13 and a right track beam 14 which are arranged in parallel are arranged on the bracket 1, the left track beam 13 and the right track beam 14 are both made of H-shaped steel, and the sliding track is positioned between the left track beam 13 and the right track beam 14; two main shafts 4 are fixed on the push rod seat 11, the axes of the main shafts 4 are perpendicular to the length direction of the sliding tracks, flat wheels 5 and V-shaped wheels 6 are respectively installed at two ends of each main shaft 4, a flat rail 131 and a V-shaped rail 141 are respectively installed on the left track beam 13 and the right track beam 14, the flat rail 131 is fixed on the inner side of the flange of the left track beam 13 through bolts, the V-shaped rail 141 is fixed on the inner side of the flange of the right track beam 14 through bolts, and the flat wheels 5 and the V-shaped wheels 6 are respectively connected to the flat rail 131 and the V-shaped rails 141 in a rolling mode.

The flat wheel 5 comprises two first bearings 51 which are sleeved at the end part of the main shaft 4 and are arranged at intervals, and a flat rolling sleeve 52 which is sleeved outside the two first bearings 51, wherein the flat rolling sleeve 52 is abutted against the flat rail 131; the flat wheel 5 further comprises a first spacer 53, the first spacer 53 being sandwiched between the two first bearings 51; an oil channel 41 is formed in the main shaft 4, the oil channel 41 is provided with a plurality of outlet ends communicated with the outside, one or more outlet ends are communicated between the two first bearings 51, one outlet end is communicated with the middle part of the main shaft 4, and an oil cup 42 is plugged in the outlet end;

the V-shaped wheel 6 comprises two second bearings 61 which are sleeved at the end part of the main shaft 4 and are arranged at intervals, and V-shaped rollers 62 which are sleeved outside the two second bearings 61, and the V-shaped rollers 62 are abutted to the V-shaped rails 141; the V-wheel 6 further comprises a second spacer 63, the second spacer 63 being sandwiched between the two second bearings 61; with one or more outlet ports communicating between the two second bearings 61.

When the push rod seat 11 moves along the sliding track, the flat wheels 5 and the V-shaped wheels 6 respectively roll relative to the flat rails 131 and the V-shaped rails 141, and the push rod seat 11 can only move along the length direction of the sliding track due to the limiting effect of the V-shaped rails 141 on the V-shaped wheels 6. And the left track beam 13 and the right track beam 14 are fixedly connected through a plurality of clamping plates 15.

The implementation principle of the embodiment is as follows: the push rod 12, i.e. the push rod seat 11, can be driven by the crank member 2, the linkage member 3, the driving member 21 and other components to realize rapid reciprocating extension, which is equivalent to that the push rod 12 can continuously generate multiple pushing operations within the time of each pipe 101 approaching the pushing range of a certain push rod 12, so that the accuracy of pushing the push rod 12 every time does not need to be ensured like in the prior art, thereby realizing blind alignment of the pipe 101 and greatly reducing the probability of furnace disorder.

Example two: referring to fig. 7, the present embodiment differs from the first embodiment only in that the linkage 3 is different, specifically: the link member 3 is rod-shaped, but is not limited to rod-shaped, one end of the link member 3 is rotatably connected to one end of the crank member 2 away from the rotation axis, the other end of the link member 3 is rotatably connected to one end of the push rod base 11 away from the push rod 12, and the distance between the connection point of the link member 3 and the crank member 2 and the connection point of the link member 3 and the push rod base 11 is larger than the distance between the connection point of the crank member 2 and the link member 3 and the connection point of the crank member 2 and the support 1. Therefore, the bracket 1, the linkage 3, the crank 2, the push rod seat 11 and the like together form a crank-slider structure, and when the driving part 21 drives the crank 2 to rotate, the push rod seat 11 can realize reciprocating movement.

It is worth to be noted that the crank slider structure also has a quick return characteristic, and under the quick return characteristic, the average speed of the process is smaller than the average speed of the return stroke; when the push rod 12 is pushed into the annealing furnace 7 and pushes the pipe 101 to reset, the slow progress characteristic can reduce the impact of the push rod 12 on the pipe 101 to reduce the deformation probability of the pipe 101, and the fast return characteristic can shorten the single expansion period to improve the efficiency.

The implementation principle of the embodiment is as follows: the same as the first embodiment.

Example three: referring to fig. 8 and 9, a centering system of an annealing furnace 7 using the centering machine of any one of the first embodiment or the second embodiment, comprises an annealing furnace 7 and a conveying mechanism 8 for conveying the pipe 101 through the annealing furnace 7, wherein the conveying mechanism 8 comprises a chain wheel 81, a chain 82 connected with the chain wheel 81 and connected end to end, a plurality of chain claws 83 mounted on the chain 82 and arranged at equal intervals along the length direction of the chain 82, and a power member (not shown in the figure) for driving the chain wheel 81 to rotate, the chain 82 penetrates through the whole annealing furnace 7, and the power member can be an electric motor or a hydraulic motor; a guide rail 84 which passes through the annealing furnace 7 and is used for supporting the pipe 101, wherein the extension direction of the guide rail 84 is parallel to the conveying direction of the conveying mechanism 8; a row of centering machines 9 are respectively arranged on two sides outside the annealing furnace 7, and the arrangement direction of each row of centering machines 9 is parallel to the conveying direction of the conveying mechanism 8; the push rod 12 of the centering machine 9 penetrates into the annealing furnace 7 in a clearance mode, and the length direction of the push rod 12 is perpendicular to the conveying direction of the conveying mechanism 8.

The implementation principle of the embodiment is as follows: because the reciprocating speed of the push rod 12 of the centering machine 9 is high, blind centering of the pipes 101 can be realized by each centering machine 9, so that a sensor is not needed, and the probability of furnace disorder is reduced.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. A centering machine, comprising a support (1), characterized in that: the support (1) is provided with a sliding track which is horizontally arranged, a push rod seat (11) penetrates through the sliding track in a sliding mode, one end of the push rod seat (11) is provided with a push rod (12), the support (1) is rotatably connected with a crank piece (2), a driving piece (21) used for driving the crank piece (2) to rotate is arranged on the support (1), and the rotating axis of the crank piece (2) is horizontally arranged; a linkage piece (3) for driving the push rod seat (11) to slide back and forth along the length direction of the sliding track is connected between one end of the crank piece (2) far away from the rotation axis and the push rod seat (11).

2. A centering machine as claimed in claim 1, characterized in that: the push rod seat (11) pushes the push rod (12) outwards along the sliding track as a process, the push rod seat (11) pulls the push rod (12) back inwards along the sliding track as a return stroke, and the average speed of the process is smaller than the average speed of the return stroke.

3. A centering machine as claimed in claim 1, characterized in that: linkage (3) are including rocker portion (31), even a pole portion (32), connecting rod portion (33), and rocker portion (31) one end is rotated and is connected in support (1) and the other end rotates and connect in connecting rod portion (33) one end, and connecting rod portion (33) other end rotates and connects in push rod seat (11), links a pole portion (32) one end and rotates and connect in crank piece (2) and keep away from its rotation axis one end, links a pole portion (32) other end and rotates and connect on the perisporium of rocker portion (31).

4. A centering machine as claimed in claim 1, characterized in that: the linkage piece (3) is rod-shaped, one end of the linkage piece (3) is rotatably connected to one end, far away from the rotation axis, of the crank piece (2), the other end of the linkage piece (3) is rotatably connected to the push rod seat (11), and the distance between the connecting point of the linkage piece (3) and the crank piece (2) and the connecting point of the linkage piece (3) and the push rod seat (11) is larger than the distance between the connecting point of the crank piece (2) and the linkage piece (3) and the connecting point of the crank piece (2) and the support (1).

5. A centering machine as claimed in claim 1, characterized in that: the support (1) is provided with a left track beam (13) and a right track beam (14) which are arranged in parallel, and the sliding track is positioned between the left track beam (13) and the right track beam (14); at least two main shafts (4) are fixed on the push rod seat (11), the axes of the main shafts (4) are perpendicular to the length direction of the sliding tracks, flat wheels (5) and V-shaped wheels (6) are respectively installed at two ends of each main shaft (4), one of the left track beam (13) and the right track beam (14) is provided with a flat track (131), the other one of the left track beam and the right track beam is provided with a V-shaped track (141), and the flat wheels (5) and the V-shaped wheels (6) are respectively connected to the flat track (131) and the V-shaped track (141).

6. A centering machine as claimed in claim 5, characterized in that: and the left track beam (13) and the right track beam (14) are both made of H-shaped steel.

7. A centering machine as claimed in claim 5, characterized in that: the flat wheel (5) comprises two first bearings (51) which are sleeved at the end part of the main shaft (4) and arranged at intervals, and flat rolling sleeves (52) which are sleeved outside the two first bearings (51), wherein the flat rolling sleeves (52) are abutted to the flat rail (131); the flat wheel (5) also comprises a first spacer bush (53), and the first spacer bush (53) is clamped between the two first bearings (51); an oil duct (41) is formed in the main shaft (4), the oil duct (41) is provided with a plurality of outlet ends communicated with the outside, one or more outlet ends are communicated between the two first bearings (51), and one outlet end is communicated with the middle part of the main shaft (4);

the V-shaped wheel (6) comprises two second bearings (61) which are sleeved at the end part of the main shaft (4) and arranged at intervals, and V-shaped rolling sleeves (62) which are sleeved outside the two second bearings (61), wherein the V-shaped rolling sleeves (62) are abutted to the V-shaped rail (141); the V-shaped wheel (6) also comprises a second spacer bush (63), and the second spacer bush (63) is clamped between the two second bearings (61); wherein one or more outlet ends communicate between the two second bearings (61).

8. A centering system of an annealing furnace (7) applying the centering machine of any one of claims 1 to 7, comprising the annealing furnace (7) and a conveying mechanism (8) for conveying the pipe (101) through the annealing furnace (7), characterized in that the conveying mechanism (8) comprises a chain wheel (81), a chain (82) which is connected with the chain wheel (81) and is connected end to end, a plurality of chain claws (83) which are arranged on the chain (82) and are arranged at equal intervals along the length direction of the chain (82), and a power part for driving the chain wheel (81) to rotate, wherein the chain (82) passes through the whole annealing furnace (7); the device also comprises a guide rail (84) which penetrates through the annealing furnace (7) and is used for supporting the pipe (101), and the extending direction of the guide rail (84) is parallel to the conveying direction of the conveying mechanism (8); a row of centering machines (9) are respectively additionally arranged on two sides outside the annealing furnace (7), and the arrangement direction of each row of centering machines (9) is parallel to the conveying direction of the conveying mechanism (8); a push rod (12) of the centering machine (9) penetrates into the annealing furnace (7) in a clearance mode, and the length direction of the push rod (12) is perpendicular to the conveying direction of the conveying mechanism (8).

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