CN110564926A - Trolley type annealing furnace - Google Patents
Trolley type annealing furnace Download PDFInfo
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- CN110564926A CN110564926A CN201910804671.6A CN201910804671A CN110564926A CN 110564926 A CN110564926 A CN 110564926A CN 201910804671 A CN201910804671 A CN 201910804671A CN 110564926 A CN110564926 A CN 110564926A
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- Prior art keywords
- riding wheel
- wheel
- driven
- driving
- trolley
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/01—Annealing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention relates to a trolley type annealing furnace, which comprises a furnace body, a trolley assembly and a smoke discharging and heat exchanging system; the smoke discharging and heat exchanging system comprises a heat exchanger, a smoke discharging fan, a high-temperature smoke discharging pipe, a low-temperature smoke discharging pipe, a cold air feeding fan, a cold air feeding pipeline and a hot air discharging pipeline; the trolley assembly comprises a trolley body, wherein a driving wheel component and a driven wheel component are mounted at the bottom of the trolley body, a riding wheel device for placing the cast iron pipe and driving the cast iron pipe to rotate and a catch wheel device for axially blocking two ends of the cast iron pipe are mounted on the trolley body, and at least two catch wheel devices are arranged and are respectively positioned on two sides of the riding wheel device; the bottom of the front end of the trolley body is provided with a trolley pressing device. The trolley type annealing furnace has reasonable structural design and complete system; the smoke discharging and heat exchanging system enables the heat in the high-temperature smoke to be reused in the annealing furnace, saves energy and has certain economic value.
Description
Technical Field
The invention relates to the field of heat treatment equipment, in particular to a trolley type annealing furnace for annealing heat treatment of ductile cast iron pipes.
Background
The car-type annealing furnace is a national standard energy-saving periodic operation furnace and has the advantages of energy conservation and electricity saving. Present trolley type annealing stove can produce a large amount of high temperature flue gas at the operation in-process, the heat transfer cooling generally need be carried out to high temperature flue gas exhaust in-process, the flue gas of present trolley type annealing stove and heat transfer system design are unreasonable, the structure is complicated, still treat to have the improvement space, the trolley assembly of trolley type annealing stove is used for placing the pipe and drives the pipe rotation in addition, then carries out thermal treatment in pushing into the furnace body, current trolley assembly structural design has unreasonable place, for example: 1. the existing trolley pressing device has the defects of complex structure, difficult control and poor pressing effect; 2. the pipe is likely to move axially in the rotating process, so that the catch wheel devices are usually arranged at the two ends of the pipe and used for blocking the two ends of the pipe, but the existing catch wheel devices have the defects of complex structure and inflexible rotation of catch wheel upright columns; 3. the roller device for placing the pipe and driving the pipe to rotate has the defect of unstable transmission.
Therefore, there is a need for improvements and optimizations to existing car-type annealing furnaces.
Disclosure of Invention
the invention aims to overcome the defects in the prior art and provide the trolley type annealing furnace with reasonable structural design and complete system.
The technical scheme adopted by the invention for solving the problems is as follows: a trolley type annealing furnace comprises a furnace body and a trolley assembly, wherein the furnace body and the trolley assembly work in a matching way; the method is characterized in that: the furnace also comprises a smoke discharging and heat exchanging system arranged at the tail part of the furnace body; the smoke discharging and heat exchanging system comprises a heat exchanger, a smoke discharging fan, a high-temperature smoke discharging pipe, a low-temperature smoke discharging pipe, a cold air feeding fan, a cold air feeding pipeline and a hot air discharging pipeline; one end of the high-temperature flue gas discharge pipe is connected with the furnace body, and the other end of the high-temperature flue gas discharge pipe is connected with the heat exchanger; one end of the low-temperature flue gas discharge pipe is connected with the heat exchanger, and the other end of the low-temperature flue gas discharge pipe is connected with the gas inlet of the smoke exhaust fan; one end of the cold air feeding pipeline is connected with the heat exchanger, and the other end of the cold air feeding pipeline is connected with the cold air feeding fan; one end of the hot air outlet pipeline is connected with the heat exchanger, and the other end of the hot air outlet pipeline is connected with an air passage of the burner; the platform truck assembly includes the automobile body, initiative wheel subassembly and driven wheel subassembly, its characterized in that are installed to the bottom of automobile body: the car body is provided with a riding wheel device for placing the cast iron pipe and driving the cast iron pipe to rotate and at least two catch wheel devices for axially blocking two ends of the cast iron pipe, wherein the catch wheel devices are respectively positioned at two sides of the riding wheel device; and a trolley pressing device is arranged at the bottom of the front end of the trolley body.
Preferably, the smoke exhaust and heat exchange system further comprises a chimney; and the air outlet of the smoke exhaust fan is connected with the chimney.
Preferably, the air outlet of the smoke exhaust fan is connected with the chimney through a first smoke exhaust pipe; a first temperature detector is arranged on the first smoke exhaust pipe.
preferably, two hot air outlet pipelines are arranged.
Preferably, the heat exchanger is mounted on a heat exchanger mounting base.
Preferably, a cold air regulating valve is arranged at the joint of the low-temperature flue gas discharge pipe and the heat exchanger.
Preferably, the smoke exhaust fan is arranged on a fan support, and the smoke exhaust fan is fixed on the fan support through a fan pressing plate.
Preferably, a second temperature detector is mounted on the hot air outlet pipeline.
Preferably, the riding wheel device comprises a first driving riding wheel, a second driving riding wheel, a first driven riding wheel, a second driven riding wheel, a third driven riding wheel and a fourth driven riding wheel, the six riding wheels are arranged in three rows and two columns, the first driving riding wheel, the second driving riding wheel and the first driven riding wheel are positioned in the same column, and the first driven riding wheel is positioned between the first driving riding wheel and the second driving riding wheel; the second driving riding wheel is in transmission connection with the first driven riding wheel and the fourth driven riding wheel respectively; the first driving riding wheel is in transmission connection with the second driven riding wheel, and the second driven riding wheel is in transmission connection with the third driven riding wheel; and an auxiliary riding wheel is arranged between the first driving riding wheel and the first driven riding wheel, between the second driven riding wheel and the third driven riding wheel and between the fourth driven riding wheel and the third driven riding wheel.
Preferably, the first driving riding wheel, the second driving riding wheel, the first driven riding wheel, the second driven riding wheel, the third driven riding wheel and the fourth driven riding wheel are respectively provided with a riding wheel shaft and are arranged on the respective riding wheel shafts; the first driving riding wheel is driven by a first speed reducer, and the first speed reducer is connected with a riding wheel shaft provided with the first driving riding wheel through a first universal coupling; the second driving riding wheel is driven by a second speed reducer, and the second speed reducer is connected with a riding wheel shaft provided with the second driving riding wheel through a second universal coupling; a riding wheel shaft provided with a fourth driven riding wheel is connected with a riding wheel shaft provided with a second driving riding wheel through a third universal coupling; the riding wheel shaft provided with the first driving riding wheel is connected with the riding wheel shaft provided with the second driven riding wheel through a fourth universal coupling.
Preferably, a riding wheel shaft provided with a first driven riding wheel is connected with a riding wheel shaft provided with a second driving riding wheel through a chain transmission device, and a first chain wheel for tensioning is arranged in the chain transmission device; similarly, the riding wheel shaft provided with the second driven riding wheel and the riding wheel shaft provided with the third driven riding wheel are also connected through a chain transmission device, and a second tensioning chain wheel is arranged in the chain transmission device.
Preferably, the catch wheel device comprises a fixed seat, a catch wheel sleeve and a catch wheel upright post; the catch wheel sleeve is vertically arranged on the fixed seat and can rotate around the axis of the catch wheel sleeve; the catch wheel upright post is vertically arranged on the catch wheel sleeve; the fixed seat is installed on the vehicle body through a bolt.
preferably, the fixed seat is provided with an accommodating cavity, the catch wheel sleeve is provided with a pair of bearings, and the pair of bearings are arranged in the accommodating cavity of the fixed seat in an up-and-down manner; the bearing adopts a cylindrical roller bearing; the upper surface of the lower bearing is provided with a lip-shaped sealing ring for sealing, the lower surface of the lower bearing is provided with a bearing end cover, and the bearing end cover is fixedly connected with the fixed seat; a lower labyrinth ring, an upper labyrinth ring and a protective cover are sequentially arranged on the upper surface of the upper bearing from bottom to top, and the upper labyrinth ring is arranged on the upper surface of the lower labyrinth ring; the lower labyrinth ring is fixedly connected with the fixed seat, and an outer ring of the bearing is pressed downwards; the upper labyrinth ring is sleeved on the catch wheel sleeve and presses the inner ring of the bearing downwards; the protective cover is sleeved on the wheel blocking sleeve and is fixedly connected with the upper labyrinth ring.
Preferably, the catch wheel sleeve is provided with a stepped through hole which is formed along the axial direction of the catch wheel sleeve and used for installing a catch wheel upright post, the upper part of the catch wheel sleeve extends out of the fixed seat, a through hole which can enable the pin shaft to pass through is formed in the position of the upper part of the catch wheel sleeve, and correspondingly, a through hole which can enable the pin shaft to pass through is also formed in the catch wheel upright post; when the catch wheel upright post is arranged in the stepped through hole of the catch wheel sleeve, the catch wheel upright post and the catch wheel sleeve are connected together by utilizing the pin shaft.
Preferably, two cutting sleeve type pipe joints for respectively filling lubricating oil to the pair of bearings are mounted on the fixed seat.
Preferably, the trolley pressing device comprises a limiting seat, a cylinder fixing seat, a pressing cylinder, a swing arm and a swing arm mounting seat; the cylinder fixing seat and the swing arm mounting seat are both arranged at the bottom of the front end of the vehicle body; the pressing cylinder is connected with the cylinder fixing seat, the end part of a cylinder rod of the pressing cylinder is connected with one end of the swing arm, and the other end of the swing arm is connected with the swing arm mounting seat; the swing arm is supported against the limiting seat under the driving of the pressing cylinder.
Preferably, fixed mounting has a connection otic placode on the cylinder fixing base, compress tightly the cylinder and articulate on a connection otic placode through a round pin axle, a round pin axle is through a fixture block and a connection otic placode fixed connection.
Preferably, a rotating shaft is installed on the swing arm installation seat, and a pair of bearings is installed on the rotating shaft; one end of the swing arm is fixedly connected with the rotating shaft; the other end of the swing arm is provided with a second connecting lug plate, the end part of a cylinder rod of the compressing cylinder is hinged with the second connecting lug plate through a second pin shaft, and the second pin shaft is fixedly connected with the second connecting lug plate through a second clamping block; and/or; a horizontal adjusting bolt is arranged on one side surface of the limiting seat, and the swing arm is driven by the pressing cylinder to abut against the adjusting bolt; when the swing arm is driven by the pressing cylinder to abut against the adjusting bolt, the swing arm is in a vertical state.
Preferably, the trolley assembly further comprises a cooling device for cooling the idler shaft, and the cooling device adopts one of an air cooling device and a water cooling device.
Preferably, the riding wheel shaft is a hollow shaft; the water cooling device comprises a water pipe for introducing cooling water, and the water pipe is arranged in the riding wheel shaft; the air cooling device comprises a cooling air feeding fan and an air feeding pipeline, the cooling air feeding fan is connected with the air feeding pipeline, six air nozzles are mounted on the air feeding pipeline and correspond to six riding wheel shafts one to one, and the air nozzles are opposite to the end portions of the riding wheel shafts.
Preferably, the water pipe is of a structure with one closed end and one open end, the closed end is positioned at one end in the riding wheel shaft, the open end extends out of the other end of the riding wheel shaft, and a bidirectional circulation inner pipe rotary joint is arranged at the open end.
preferably, the bidirectional circulation inner pipe rotary joint is provided with a pagoda joint for water inlet and a pagoda joint for water return; the water inlet pagoda joint is connected with one end of a water inlet hose, and the other end of the water inlet hose is connected with a pagoda joint for welding a water inlet pipe; the cone joint for backwater is connected with one end of a hose for backwater, and the other end of the hose for backwater is connected with a cone joint for welding a backwater pipe.
Preferably, one end of the bidirectional flow-through inner pipe rotary joint is arranged at the end part of the idler shaft through a transition joint.
Preferably, two bearings are mounted on the idler shaft, the bearings are mounted on bearing blocks, and the bearing blocks are mounted on the support.
Compared with the prior art, the invention has the following advantages and effects: the trolley type annealing furnace has reasonable structural design and complete system; the smoke discharging and heat exchanging system has simple and reasonable structural design, so that the heat in the high-temperature smoke is reused in the annealing furnace, the energy is saved, and certain economic value is achieved; two driving riding wheels are arranged in the riding wheel device, one driving riding wheel respectively drives two driven riding wheels, and a tensioning chain wheel is arranged, so that the riding wheels are stably driven; the catch wheel device has reasonable and simple structural design, and the catch wheel sleeve can be flexibly and rotatably arranged on the fixed seat through the pair of cylindrical roller bearings, so that the catch wheel upright post can flexibly rotate; the trolley pressing device is simple in structure, driven by the air cylinder, easy to control and not prone to failure, good in pressing effect, and capable of guaranteeing sealing reliability of the trolley and the furnace body.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic front view showing a structure of a car-type annealing furnace according to an embodiment of the present invention.
Fig. 2 is a front view structural schematic diagram of the trolley assembly in the embodiment of the invention.
Fig. 3 is a schematic top view of the trolley assembly according to the embodiment of the present invention.
Fig. 4 is a schematic view showing a plane arrangement structure of the first driving riding wheel, the second driving riding wheel, the first driven riding wheel, the second driven riding wheel, the third driven riding wheel and the fourth driven riding wheel.
3 fig. 35 3 is 3 a 3 schematic 3 view 3 of 3 the 3 structure 3 in 3 the 3 direction 3 of 3 a 3- 3 a 3 in 3 fig. 32 3. 3
Fig. 6 is a schematic view of the structure in the direction B-B in fig. 2.
Fig. 7 is a schematic view of the structure in the direction C in fig. 2.
Fig. 8 is a schematic view of the structure in the direction D in fig. 2.
Fig. 9 is a front view schematically illustrating the catch wheel device according to the embodiment of the present invention.
Fig. 10 is a left side view schematically showing the structure of the catch wheel device according to the embodiment of the present invention (without the catch wheel pillar mounted).
Fig. 11 is a schematic top view of a fixing base according to an embodiment of the invention.
Fig. 12 is a front view schematically showing the structure of the carriage pressing device in the embodiment of the present invention (non-pressed state).
Fig. 13 is a schematic view of the structure in the direction F-F in fig. 12.
Fig. 14 is a schematic view of the structure in the direction E of fig. 12.
Fig. 15 is another front view schematically showing the structure of the dolly compression device in the embodiment of the invention (compression state).
Fig. 16 is a schematic top view of the structure of fig. 15.
FIG. 17 is a schematic front view of the smoke evacuation and heat exchange system installed at the rear of the furnace body in the embodiment of the present invention.
Fig. 18 is a schematic top view of the structure of fig. 17.
Fig. 19 is a left side view of the structure of fig. 17.
Fig. 20 is a schematic view of a connection structure of a chimney and a smoke exhaust fan in the embodiment of the invention.
Fig. 21 is a schematic front view of the water cooling device in this embodiment 2.
Fig. 22 is a left side view of the structure of fig. 21.
Description of reference numerals:
A furnace body 1; a vehicle body 2; an active wheel assembly 8; driven wheel assembly 9;
A smoke exhaust and heat exchange system 3; a burner A; a heat exchanger 31; a heat exchanger mounting base 311; a smoke exhaust fan 32; a high-temperature flue gas discharge pipe 33; a low temperature flue gas discharge pipe 34; a chimney 35; cold air is fed into the fan 36; a cold air supply duct 37; a hot air outlet duct 38; a cold air regulating valve 39; 3-10 parts of a fan support; 3-11 parts of a fan pressing plate; 3-12 parts of a first smoke exhaust pipe; a first temperature detector 3-13; a second thermometer 3-14;
A trolley hold-down device 5; a stopper base 51; a cylinder fixing seat 52; a pressing cylinder 53; a swing arm 54; a swing arm mount 55; a first engaging lug 56; a first pin 57; a first latch block 58; a rotating shaft 59; a bearing 510; a second connection lug plate 511; a second pin 512; a second latch 513; an adjusting bolt 514;
a catch wheel device 6; a fixed base 61; a retainer sleeve 62; catch wheel posts 63; a bearing 64; a lip seal 65; a bearing end cap 66; an upper labyrinth ring 67; a lower labyrinth ring 68; a protective cover 69; a ferrule type tube fitting 610; a pin shaft 611;
A riding wheel device 7; a first driving riding wheel 71; a second drive idler 72; a first driven idler 73; a second driven idler 74; a third driven idler 75; a fourth driven idler 76; an auxiliary idler 77; a first speed reducer 78; a first universal coupling 79; a second speed reducer 710; a second universal coupling 711; a third universal coupling 712; a fourth universal joint 713; a first tension sprocket 714; a second tensioning sprocket 715;
cooling air is sent into the fan 11; an air supply duct 12; a tuyere 13;
A water pipe 42; a bidirectional flow-through inner tube rotary joint 43; a pagoda joint 44 for water intake; a pagoda joint 45 for backwater; a water inlet hose 46; a pagoda joint 47 for welding the water inlet pipe; a water return hose 48; a pagoda joint 49 for welding the water return pipe; a bearing 410; a bearing housing 411; a bracket 412; a transition joint 414.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
See fig. 1-20.
The embodiment discloses a trolley type annealing furnace, which comprises a furnace body 1, a trolley assembly and a smoke discharging and heat exchanging system 3 arranged at the tail part of the furnace body 1, wherein the furnace body 1 and the trolley assembly work in a matching way, and the smoke discharging and heat exchanging system 3 discharges smoke in the furnace body 1.
The trolley assembly comprises a trolley body 2, wherein a driving wheel component 8 and a driven wheel component 9 are mounted at the bottom of the trolley body 2, the number of the driving wheel components 8 is two, the driving wheel components are respectively driven by a speed reducer, and the number of the driven wheel components 9 is one.
In the embodiment, the vehicle body 2 is provided with a riding wheel device 7 for placing the cast iron pipe and driving the cast iron pipe to rotate and two catch wheel devices 6 for axially blocking two ends of the cast iron pipe, and the two catch wheel devices 6 are respectively positioned at two sides of the riding wheel device 7; the bottom of the front end of the vehicle body 2 is provided with a trolley pressing device 5.
Specifically, the roller unit 7 in this embodiment includes a first driving roller 71, a second driving roller 72, a first driven roller 73, a second driven roller 74, a third driven roller 75, and a fourth driven roller 76, and the six rollers are arranged in three rows and two columns, wherein the first driving roller 71, the second driving roller 72, and the first driven roller 73 are located in the same column, and the first driven roller 73 is located between the first driving roller 71 and the second driving roller 72.
In this embodiment, the second driving riding wheel 72 is in transmission connection with the first driven riding wheel 73 and the fourth driven riding wheel 76 respectively; the first driving riding wheel 71 is in transmission connection with the second driven riding wheel 74, and the second driven riding wheel 74 is in transmission connection with the third driven riding wheel 75.
in this embodiment, an auxiliary riding wheel 77 is disposed between the first driving riding wheel 71 and the first driven riding wheel 73, between the second driving riding wheel 72 and the first driven riding wheel 73, between the second driven riding wheel 74 and the third driven riding wheel 75, and between the fourth driven riding wheel 76 and the third driven riding wheel 75. The four auxiliary supporting rollers 77 jointly support the cast iron pipe.
When the riding wheel is specifically installed, the first driving riding wheel 71, the second driving riding wheel 72, the first driven riding wheel 73, the second driven riding wheel 74, the third driven riding wheel 75 and the fourth driven riding wheel 76 are respectively configured with one riding wheel shaft and are installed on the respective riding wheel shafts.
In this embodiment, the first driving idler 71 is driven by a first speed reducer 78, and the first speed reducer 78 is connected with the idler shaft on which the first driving idler 71 is mounted through a first universal coupling 79. The second driving riding wheel 72 is driven by a second speed reducer 710, and the second speed reducer 710 is connected with a riding wheel shaft provided with the second driving riding wheel 72 through a second universal coupling 711.
In this embodiment, the idler shaft on which the fourth driven idler 76 is mounted is connected to the idler shaft on which the second driving idler 72 is mounted by a third universal coupling 712. The riding wheel shaft provided with the first driving riding wheel 71 is connected with the riding wheel shaft provided with the second driven riding wheel 74 through a fourth universal coupling 713.
In this embodiment, the idler shaft on which the first driven idler 73 is mounted and the idler shaft on which the second driving idler 72 is mounted are connected by a chain transmission, and the first tension sprocket 714 is provided in the chain transmission. Similarly, the idler shaft on which the second driven idler 74 is mounted and the idler shaft on which the third driven idler 75 is mounted are connected by a chain drive, and a second tension sprocket 715 is provided in the chain drive.
In this embodiment, the cooling mode of the idler shaft is air cooling, the cooling air of the air cooling device is sent into the fan 11 and the air supply pipeline 12, the cooling air is sent into the fan 11 and is connected with the air supply pipeline 12, and the cooling air is sent into the fan and is installed on the vehicle body 2. Six air nozzles 13 are arranged on the air supply pipeline 12, the six air nozzles 13 correspond to six riding wheel shafts one by one, and the air nozzles 13 are over against the end parts of the riding wheel shafts.
In this embodiment, the catch wheel device 6 includes a fixed seat 61, a catch wheel sleeve 62 and a catch wheel upright 63; the catch wheel sleeve 62 is vertically arranged on the fixed seat 61 and can rotate around the axis of the catch wheel sleeve; the catch wheel post 63 is vertically mounted on the catch wheel housing 62.
in this embodiment, the fixed seat 61 has an accommodating cavity, the retaining wheel sleeve 62 is provided with a pair of bearings 64, the pair of bearings 64 are arranged in the accommodating cavity of the fixed seat 61 in a one-to-one manner, so that the retaining wheel sleeve 62 is rotatably arranged in the accommodating cavity of the fixed seat 61, and the bearings 64 are cylindrical roller bearings. Two ferrule type pipe joints 610 for respectively filling lubricating oil to the pair of bearings 64 are mounted on the fixed seat 61. Before the wheel blocking device is used, lubricating grease is filled into the pair of bearings 64 through the ferrule type pipe joint 610.
Specifically, a lip seal 65 is arranged on the lower bearing 64 for sealing, a bearing end cover 66 is arranged on the lower side, and the bearing end cover 66 and the fixed seat 61 are welded and fixed together; a lower labyrinth ring 68, an upper labyrinth ring 67 and a protective cover 69 are sequentially arranged on the upper surface of the upper bearing 64 from bottom to top, and the upper labyrinth ring 67 is arranged on the lower labyrinth ring 68; the lower labyrinth ring 68 is fixedly connected with the fixed seat 61 and presses the outer ring of the bearing 64 downwards; the upper labyrinth ring 67 is sleeved on the catch wheel sleeve 62 and presses down the inner ring of the bearing 64; the protecting cover 69 is sleeved on the catch wheel sleeve 62 and fixedly connected with the upper labyrinth ring 67. The lower labyrinth ring 68 and the upper labyrinth ring 67 seal the upper bearing 64 against the entry of foreign matter.
in this embodiment, the catch wheel sleeve 62 has a stepped through hole formed along the axial direction thereof for mounting the catch wheel column 63, and accordingly, the catch wheel column 63 is also provided in a stepped shape, which facilitates positioning of the catch wheel column 63. The upper part of the catch wheel sleeve 62 extends out of the fixed seat 61, a through hole which can enable the pin shaft 611 to pass through is formed in the upper part of the catch wheel sleeve 62, and correspondingly, a through hole which can enable the pin shaft 611 to pass through is also formed in the catch wheel upright column 63; when the catch wheel post 63 is mounted in the stepped through-hole of the catch wheel housing 62, the catch wheel post 63 and the catch wheel housing 62 are coupled together by the pin 611.
in this embodiment, catch wheel device 6 uses in pairs, install on automobile body 2, be located the both sides of riding wheel device 7, block the both ends of pipe respectively, prevent that the pipe from taking place axial displacement at rotatory in-process, and catch wheel device 6 passes through bolt detachably and installs, convenient adjustment, with the pipe that is suitable for different length, in addition, when being applicable to the pipe of different pipe diameters, only need to change catch wheel stand 63 can, catch wheel stand 63 through round pin axle 611 with catch wheel cover 62 and install together, it is convenient to change.
In this embodiment, the trolley pressing device 5 includes a limiting seat 51, a cylinder fixing seat 52, a pressing cylinder 53, a swing arm 54 and a swing arm mounting seat 55. The cylinder fixing seat 52 and the swing arm mounting seat 55 are both arranged at the bottom of the frame of the trolley 2; the limiting seat 51 is fixedly arranged on the ground beside the furnace door of the furnace body.
In this embodiment, the pressing cylinder 53 is connected with the cylinder fixing seat 52, specifically, a first connecting lug plate 56 is fixedly installed on the cylinder fixing seat 52, the pressing cylinder 53 is hinged on the first connecting lug plate 56 through a first pin shaft 57, and the first pin shaft 57 is fixedly connected with the first connecting lug plate 56 through a first clamping block 58.
In this embodiment, the end of the cylinder rod of the pressing cylinder 53 is connected to one end of the swing arm 54, and the other end of the swing arm 54 is connected to the swing arm mounting seat 55; the swing arm 54 is driven by the pressing cylinder 53 to abut against the limiting seat 51. Specifically, the swing arm mounting base 55 is provided with a rotating shaft 59, and the rotating shaft 59 is provided with a pair of bearings 510; one end of the swing arm 54 is fixedly connected with the rotating shaft 59. The other end of the swing arm 54 is provided with a second connecting lug plate 511, the end part of the cylinder rod of the pressing cylinder 53 is hinged with the second connecting lug plate 511 through a second pin shaft 512, and the second pin shaft 512 is fixedly connected with the second connecting lug plate 511 through a second clamping block 513.
In this embodiment, a horizontal adjusting bolt 514 is installed on one side surface of the limiting seat 51, and the swing arm 54 is driven by the pressing cylinder 53 to abut against the adjusting bolt 514. When the swing arm 54 abuts against the adjusting bolt 514 under the driving of the pressing cylinder 53, the swing arm 54 is in a vertical state.
in this embodiment, when the trolley pressing device 5 is used specifically, the limiting seat 51 is fixedly mounted on the ground beside the furnace door of the furnace body, after the trolley assembly runs into the furnace body, the pressing cylinder 53 is started afterwards, and the pressing cylinder 53 drives the swing arm 54 to abut against the adjusting bolt 514 of the limiting seat 51, so that the trolley pressing is realized, and the sealing reliability of the trolley and the furnace body is ensured.
In this embodiment, the smoke exhaust and heat exchange system 3 includes a heat exchanger 31, a smoke exhaust fan 32, a high-temperature smoke exhaust pipe 33, a low-temperature smoke exhaust pipe 34, a chimney 35, a cold air feeding fan 36, a cold air feeding pipe 37, and a hot air feeding pipe 38. Burner nozzles A are arranged on two sides of the top of the furnace body 1.
In this embodiment, one end of the high-temperature flue gas discharge pipe 33 is connected with the furnace body 1, and the other end is connected with the heat exchanger 31; one end of the low-temperature flue gas discharge pipe 34 is connected with the heat exchanger 31, the other end is connected with the gas inlet of the smoke exhaust fan 32, the gas outlet of the smoke exhaust fan 32 is connected with the chimney 35, and specifically, the gas outlet of the smoke exhaust fan 32 is connected with the chimney 35 through a first smoke discharge pipe 3-12; the first smoke exhaust pipe 3-12 is provided with a first temperature detector 3-13 for detecting the temperature of the exhausted smoke. The high-temperature flue gas discharge pipe 33 is communicated with the gas path of the low-temperature flue gas discharge pipe 34.
In this embodiment, one end of the cold air feeding duct 37 is connected to the heat exchanger 31, and the other end is connected to the cold air feeding fan 36; one end of the hot air outlet pipeline 38 is connected with the heat exchanger 31, and the other end is connected with the air path of the burner A. The cold air feeding pipeline 37 is communicated with the hot air discharging pipeline 38. Two hot air delivery pipelines 38 are arranged, which correspond to the burners A on the two sides respectively, and a second thermometer 3-14 is installed on the hot air delivery pipelines 38 and used for detecting the temperature of the hot air in the hot air delivery pipelines 38.
In the present embodiment, the heat exchanger 31 is mounted on one heat exchanger mounting base 311. And a cold air regulating valve 39 is arranged at the joint of the low-temperature flue gas discharge pipe 34 and the heat exchanger 31. The smoke exhaust fan 32 is mounted on a fan support 3-10, and the smoke exhaust fan 32 is fixed on the fan support through a fan pressure plate 3-11.
in this embodiment, the working process of the smoke discharging and heat exchanging system 3 is as follows: high-temperature flue gas generated in the furnace body 1 enters the heat exchanger 31 through the high-temperature flue gas discharge pipe 33, and is sent into the cold air in the heat exchanger 31 by the cold air feeding fan 36 for heat exchange, low-temperature flue gas generated after the high-temperature flue gas is cooled by the heat exchange is discharged through the low-temperature flue gas discharge pipe 34, and the low-temperature flue gas is discharged to the chimney 35 under the leading-out of the smoke exhaust fan 32; the cold air sent into the heat exchanger 31 by the cold air sending fan 36 is changed into hot air after heat exchange and temperature rise, and the hot air is sent to the burner A for combustion supporting through the hot air sending pipeline 38.
Example 2.
Refer to fig. 21 and 22.
The present embodiment 2 differs from embodiment 1 in that: the cooling of the riding wheel shaft adopts water cooling, and the riding wheel shaft is a hollow shaft; the water cooling means comprises a water pipe 42 for passing cooling water, the water pipe 42 being installed in the idler shaft. Two bearings 410 are arranged on the idler shaft, the bearings 410 are arranged on a bearing seat 411, and the bearing seat 411 is arranged on a bracket 412. The water pipe 42 is a structure with one closed end and one open end, the closed end is positioned at one end inside the riding wheel shaft, the open end extends out from the other end of the riding wheel shaft, and a bidirectional circulation inner pipe rotary joint 43 is arranged at the open end. One end of the bi-directional flow through inner tube swivel 43 is mounted to the end of the idler shaft by a transition fitting 414.
In this embodiment, the bidirectional circulation inner pipe rotary joint 43 is provided with a water inlet pagoda joint 44 and a water return pagoda joint 45; the water inlet pagoda joint 44 is connected with one end of a water inlet hose 46, and the other end of the water inlet hose 46 is connected with a water inlet pipe welding pagoda joint 47; the return water pagoda joint 45 is connected with one end of a return water hose 48, and the other end of the return water hose 48 is connected with a return water pipe welding pagoda joint 49.
In this embodiment, the working process of the water cooling device is as follows: firstly, a pagoda joint 47 for welding a water inlet pipe and a water inlet pipe are welded together, a pagoda joint 49 for welding a water return pipe and the water return pipe are welded together, then cooling water is introduced into a water pipe 42 to cool a riding wheel shaft, further, a riding wheel arranged on the riding wheel shaft is cooled, and the cooling water in the water pipe 42 flows back to the water return pipe from the end of the pagoda joint 45 for returning water after heat exchange.
in addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A trolley type annealing furnace comprises a furnace body (1) and a trolley assembly, wherein the furnace body (1) and the trolley assembly work in a matching way; the method is characterized in that: the furnace also comprises a smoke discharging and heat exchanging system (3) arranged at the tail part of the furnace body (1);
The smoke discharging and heat exchanging system (3) comprises a heat exchanger (31), a smoke discharging fan (32), a high-temperature smoke discharging pipe (33), a low-temperature smoke discharging pipe (34), a cold air feeding fan (36), a cold air feeding pipeline (37) and a hot air discharging pipeline (38); one end of the high-temperature flue gas discharge pipe (33) is connected with the furnace body (1), and the other end of the high-temperature flue gas discharge pipe is connected with the heat exchanger (31); one end of the low-temperature flue gas discharge pipe (34) is connected with the heat exchanger (31), and the other end of the low-temperature flue gas discharge pipe is connected with the gas inlet of the flue gas exhaust fan (32); one end of the cold air feeding pipeline (37) is connected with the heat exchanger (31), and the other end of the cold air feeding pipeline is connected with the cold air feeding fan (36); one end of the hot air outlet pipeline (38) is connected with the heat exchanger (31), and the other end of the hot air outlet pipeline is connected with an air path of the burner (A);
The platform truck assembly includes automobile body (2), driving wheel subassembly (8) and driven wheel subassembly (9), its characterized in that are installed to the bottom of automobile body (2): the car body (2) is provided with riding wheel devices (7) for placing the cast iron pipe and driving the cast iron pipe to rotate and wheel blocking devices (6) for axially blocking two ends of the cast iron pipe, and at least two wheel blocking devices (6) are arranged and are respectively positioned on two sides of the riding wheel devices (7); and a trolley pressing device (5) is arranged at the bottom of the front end of the trolley body (2).
2. the cart-type annealing furnace according to claim 1, wherein: the smoke exhaust and heat exchange system (3) further comprises a chimney (35); and the air outlet of the smoke exhaust fan (32) is connected with a chimney (35).
3. The cart-type annealing furnace according to claim 1, wherein: the riding wheel device (7) comprises a first driving riding wheel (71), a second driving riding wheel (72), a first driven riding wheel (73), a second driven riding wheel (74), a third driven riding wheel (75) and a fourth driven riding wheel (76), the six riding wheels are arranged in three rows and two columns, wherein the first driving riding wheel (71), the second driving riding wheel (72) and the first driven riding wheel (73) are positioned in the same column, and the first driven riding wheel (73) is positioned between the first driving riding wheel (71) and the second driving riding wheel (72);
The second driving riding wheel (72) is in transmission connection with the first driven riding wheel (73) and the fourth driven riding wheel (76) respectively; the first driving riding wheel (71) is in transmission connection with the second driven riding wheel (74), and the second driven riding wheel (74) is in transmission connection with the third driven riding wheel (75);
and an auxiliary riding wheel (77) is arranged between the first driving riding wheel (71) and the first driven riding wheel (73), between the second driving riding wheel (72) and the first driven riding wheel (73), between the second driven riding wheel (74) and the third driven riding wheel (75) and between the fourth driven riding wheel (76) and the third driven riding wheel (75).
4. The cart-type annealing furnace according to claim 3, wherein: the first driving riding wheel (71), the second driving riding wheel (72), the first driven riding wheel (73), the second driven riding wheel (74), the third driven riding wheel (75) and the fourth driven riding wheel (76) are respectively configured with a riding wheel shaft and are arranged on the respective riding wheel shafts;
The first driving riding wheel (71) is driven by a first speed reducer (78), and the first speed reducer (78) is connected with a riding wheel shaft provided with the first driving riding wheel (71) through a first universal coupling (79);
The second driving riding wheel (72) is driven by a second speed reducer (710), and the second speed reducer (710) is connected with a riding wheel shaft provided with the second driving riding wheel (72) through a second universal coupling (711);
A riding wheel shaft provided with a fourth driven riding wheel (76) is connected with a riding wheel shaft provided with a second driving riding wheel (72) through a third universal coupling (712); the riding wheel shaft provided with the first driving riding wheel (71) is connected with the riding wheel shaft provided with the second driven riding wheel (74) through a fourth universal coupling (713).
5. The cart-type annealing furnace according to claim 1, wherein: the catch wheel device (6) comprises a fixed seat (61), a catch wheel sleeve (62) and a catch wheel upright post (63); the catch wheel sleeve (62) is vertically arranged on the fixed seat (61) and can rotate around the axis of the catch wheel sleeve; the catch wheel upright post (63) is vertically arranged on the catch wheel sleeve (62); the fixed seat (61) is installed on the vehicle body (2) through a bolt.
6. The cart-type annealing furnace according to claim 5, wherein: the fixed seat (61) is provided with an accommodating cavity, a pair of bearings (64) are mounted on the catch wheel sleeve (62), and the pair of bearings (64) are mounted in the accommodating cavity of the fixed seat (61) in an up-down mode; the bearing (64) adopts a cylindrical roller bearing; a lip-shaped sealing ring (65) is arranged on the lower bearing (64) for sealing, a bearing end cover (66) is arranged on the lower surface, and the bearing end cover (66) is fixedly connected with the fixed seat (61); a lower labyrinth ring (68), an upper labyrinth ring (67) and a protective cover (69) are sequentially arranged on the upper surface of the upper bearing (64) from bottom to top, and the upper labyrinth ring (67) is arranged on the upper surface of the lower labyrinth ring (68); the lower labyrinth ring (68) is fixedly connected with the fixed seat (61), and the outer ring of the bearing (64) is pressed downwards; the upper labyrinth ring (67) is sleeved on the catch wheel sleeve (62) and presses the inner ring of the bearing (64) downwards; the protective cover (69) is sleeved on the wheel blocking sleeve (62) and fixedly connected with the upper labyrinth ring (67).
7. The cart-type annealing furnace according to claim 1, wherein: the trolley pressing device (5) comprises a limiting seat (51), a cylinder fixing seat (52), a pressing cylinder (53), a swing arm (54) and a swing arm mounting seat (55); the cylinder fixing seat (52) and the swing arm mounting seat (55) are both arranged at the bottom of the front end of the vehicle body (2); the pressing air cylinder (53) is connected with the air cylinder fixing seat (52), the end part of an air cylinder rod of the pressing air cylinder (53) is connected with one end of the swing arm (54), and the other end of the swing arm (54) is connected with the swing arm mounting seat (55); the swing arm (54) is driven by the pressing cylinder (53) to abut against the limiting seat (51).
8. The cart-type annealing furnace according to claim 1, wherein: a first connecting lug plate (56) is fixedly installed on the air cylinder fixing seat (52), the pressing air cylinder (53) is hinged to the first connecting lug plate (56) through a first pin shaft (57), and the first pin shaft (57) is fixedly connected with the first connecting lug plate (56) through a first clamping block (58);
And/or; a rotating shaft (59) is installed on the swing arm installation seat (55), and a pair of bearings (510) is installed on the rotating shaft (59); one end of the swing arm (54) is fixedly connected with the rotating shaft (59); the other end of the swing arm (54) is provided with a second connecting lug plate (511), the end part of a cylinder rod of the pressing cylinder (53) is hinged with the second connecting lug plate (511) through a second pin shaft (512), and the second pin shaft (512) is fixedly connected with the second connecting lug plate (511) through a second clamping block (513);
And/or; a horizontal adjusting bolt (514) is arranged on one side surface of the limiting seat (51), and the swing arm (54) is abutted against the adjusting bolt (514) under the driving of the pressing cylinder (53); when the swing arm (54) is driven by the pressing cylinder (53) to abut against the adjusting bolt (514), the swing arm (54) is in a vertical state.
9. The cart-type annealing furnace according to claim 1, wherein: the trolley assembly further comprises a cooling device for cooling the riding wheel shaft, and the cooling device adopts one of an air cooling device or a water cooling device.
10. The cart-type annealing furnace according to claim 9, wherein: the riding wheel shaft is a hollow shaft; the water cooling device comprises a water pipe (42) for introducing cooling water, and the water pipe (42) is arranged in the riding wheel shaft; the air cooling device comprises a cooling air feeding fan (11) and an air supply pipeline (12), wherein the cooling air feeding fan (11) is connected with the air supply pipeline (12), six air nozzles (13) are installed on the air supply pipeline (12), the six air nozzles (13) correspond to six riding wheel shafts one to one, and the air nozzles (13) are opposite to the end portions of the riding wheel shafts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910804671.6A CN110564926A (en) | 2019-08-28 | 2019-08-28 | Trolley type annealing furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910804671.6A CN110564926A (en) | 2019-08-28 | 2019-08-28 | Trolley type annealing furnace |
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| CN110564926A true CN110564926A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910804671.6A Pending CN110564926A (en) | 2019-08-28 | 2019-08-28 | Trolley type annealing furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471955A (en) * | 2020-04-24 | 2020-07-31 | 河南铁建铁路轨道配件有限公司 | Trolley type zincizing furnace for zincizing rail fittings |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1531623A (en) * | 1967-05-24 | 1968-07-05 | Lorraine Laminage | Swivel hood for smoke evacuation |
| CN2325738Y (en) * | 1997-12-03 | 1999-06-23 | 新兴铸管(集团)有限责任公司 | Bogie type annealing furnace |
| CN101603774A (en) * | 2009-07-22 | 2009-12-16 | 江西稀有金属钨业控股集团有限公司 | Rotary kiln with supporting-roller shaft water cooling plant |
| CN204644414U (en) * | 2015-04-28 | 2015-09-16 | 新兴铸管股份有限公司 | Cast tube anneal station car bumper wheel apparatus |
| CN107419068A (en) * | 2017-09-21 | 2017-12-01 | 江苏恒力炉业有限公司 | A kind of sector gas saves annealing furnace |
| CN210765401U (en) * | 2019-08-28 | 2020-06-16 | 浙江深澳机械工程有限公司 | Trolley type annealing furnace |
-
2019
- 2019-08-28 CN CN201910804671.6A patent/CN110564926A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1531623A (en) * | 1967-05-24 | 1968-07-05 | Lorraine Laminage | Swivel hood for smoke evacuation |
| CN2325738Y (en) * | 1997-12-03 | 1999-06-23 | 新兴铸管(集团)有限责任公司 | Bogie type annealing furnace |
| CN101603774A (en) * | 2009-07-22 | 2009-12-16 | 江西稀有金属钨业控股集团有限公司 | Rotary kiln with supporting-roller shaft water cooling plant |
| CN204644414U (en) * | 2015-04-28 | 2015-09-16 | 新兴铸管股份有限公司 | Cast tube anneal station car bumper wheel apparatus |
| CN107419068A (en) * | 2017-09-21 | 2017-12-01 | 江苏恒力炉业有限公司 | A kind of sector gas saves annealing furnace |
| CN210765401U (en) * | 2019-08-28 | 2020-06-16 | 浙江深澳机械工程有限公司 | Trolley type annealing furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471955A (en) * | 2020-04-24 | 2020-07-31 | 河南铁建铁路轨道配件有限公司 | Trolley type zincizing furnace for zincizing rail fittings |
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