CN201000271Y - Small torquemoment and non-additional bending moment single tube high temperature furnace - Google Patents

Abstract

The utility model discloses a small torque single tube high temperature oven without attached bending moment, which comprises an oven tube and a heating device positioned outside the oven tube, as well as a rotating axle arranged over the oven tube, wherein the rotating axle is connected with a driving mechanism, a driving belt wheel is respectively fixed at each of the two ends of the rotating axle, a driven belt wheel is respectively fixed at each of the two ends of the oven tube, the driving belt wheel and the driven belt wheel are connected mutually through a driving hoist belt, and the oven tube is over hanged on the driving hoist belt. The driving hoist belt also plays the function of over hanging the oven tube besides driving, and provides the oven tube with a flexible supporting, and when the two ends of the oven tube are provided with different axles, the flexible supporting will not generates attached bending moment on the oven tube. The driving of dual side belts can greatly reduce the torque that the oven tube bears, meanwhile the destructive torque caused by asynchrony and exerted on the oven tube can be automatically eliminated, and because the torque and the bending moment exerted on the oven tube are eliminated in the maximum limit, the oven tube of the utility model is uneasy to break off and damage.

Description

Little moment of torsion does not have additional bending moment single tube high temperature furnace

Technical field

The utility model relates to a kind of high temperature sintering furnace, the rotary rotary high temp sintering stove of particularly a kind of boiler tube.

Background technology

High temperature sintering furnace is used for pottery, the high temperature sintering of goods such as powder metallurgy, its operating temperature can reach 1650 ℃, for thin-walled heavy caliber earthenware goods, the high temperature sintering of high-temperature sensitiveness sintered article, and the sintering temperature band is narrow, the high temperature sintering of high-temperature uniformity sintered article (as powder metallurgy etc.), its sintering process requires the sintering workspace of agglomerating plant to possess stable temperature field and high temperature homogeneity on bigger volume and span, could obtain the finished product of high-quality system, for satisfying this instructions for use, agglomerating plant must adopt thin-walled rotary type circular pipe type burner hearth.

For this rotary type boiler tube, goods to be sintered are positioned at boiler tube, heater then is positioned at the outside of boiler tube, therefore the temperature that boiler tube bore will be higher than the sintering temperature of its sintered article, promptly be higher than 1650 ℃, with regard to existing furnace tube material (corundum products), this temperature is near the high-temerature creep temperature of its material itself, and sintering process generally need be more than 30 hours, use under such adverse conditions, every performance indications of furnace tube material particularly rupture strength sharply descend than normal temperature state.This nonmetallic boiler tube does not pass through machining, the axiality at its two ends can't guarantee, and furnace tube material can not carry out strain, is applied to the damage that fractures that moment of torsion on the boiler tube and moment of flexure very easily cause boiler tube by transmission system when boiler tube rotates like this, and sintering process can't be finished.

The utility model content

The technical problems to be solved in the utility model provides a kind of rotary high temperature furnace of boiler tube of more reasonable structure, to overcome the defective that the boiler tube frangibility is damaged in the prior art.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of little moment of torsion does not have additional bending moment single tube high temperature furnace, comprise boiler tube and the heater that is positioned at the boiler tube outside, also comprise a power transmission shaft that is installed in directly over the boiler tube, described power transmission shaft is connected with transmission mechanism, each fixes a driving pulley two ends of power transmission shaft, each fixes a driven pulley two ends of described boiler tube, be connected by the transmission hanging belt between described driving pulley and the driven pulley, described boiler tube is suspended on the transmission hanging belt.

The utility model all is provided with belt wheel at the two ends of boiler tube, and power transmission shaft drives the boiler tube rotation in the mode of band transmission, compares the moment of torsion that this bilateral transmission can reduce boiler tube is greatly born with one-sided transmission; When the transmission of both sides is asynchronous, relative slip can take place between transmission hanging belt and the belt wheel, can eliminate the destructive moment of torsion that is applied on the boiler tube because of asynchronous automatically; The transmission hanging belt also plays the effect of suspention boiler tube except that transmission, for boiler tube provides the support of a flexibility, when there was the out-of-alignment phenomenon in the boiler tube two ends, this flexible support can not produce additional bending moment on boiler tube.And if adopt the rigid support of forms such as bearing block, when there was the out-of-alignment phenomenon in the boiler tube two ends, rigid support can produce additional bending moment on boiler tube, caused boiler tube to fracture.

As to improvement of the technical scheme, the distance between described two driven pulleys under the normal temperature is than the short A/2 of the distance between two driving pulleys, wherein the A elongation that is described boiler tube when normal temperature is raised to operating temperature.When boiler tube reached operating temperature, the boiler tube elongation made two distances between the driven pulley than the distance A/2 between two driving pulleys.When boiler tube was flexible like this, initiatively the inclined to one side square between the driven pulley can not surpass A/4, thereby makes the drift angle minimum of transmission hanging belt.During boiler tube work, the transmission hanging belt has an axial thrust load to the active force of boiler tube, and this axial thrust load makes boiler tube produce axial compression stress, and this axial compression stress can help to improve the bending strength of boiler tube.

As a kind of preferred version of technique scheme, also comprise two boiler tube end covers that are enclosed within the boiler tube two ends, to fixedly connected between described boiler tube end cover and the boiler tube, described driven pulley is fixed on the boiler tube end and puts.After adopting boiler tube end cover, can make the tube wall of boiler tube needn't be too thick, to improve the heat transfer property of boiler tube; The wall thickness that suitably increases boiler tube end cover is more convenient for being connected with driven pulley; Simultaneously, the thin-walled boiler tube is in the temperature field uniform and stable in the stove works, and the zone that thermograde is bigger carries out the transition to the better boiler tube end of heat endurance and puts.

More preferably, also be fixed with reinforcement between described two boiler tube ends cover, described reinforcement is close on the outer surface of boiler tube.Reinforcement can improve the intensity of boiler tube, and the heat transfer property that is unlikely again boiler tube simultaneously causes too big influence.Several reinforcements are close to the outside of boiler tube vertically, form a cage construction together with two boiler tube end covers, when the boiler tube expanded by heating, it is big that diameter becomes, and reinforcement can apply radial pressure to boiler tube, not for the furnace tube material of tension, this radial pressure also can improve the intensity of boiler tube for resistance to compression, helps to avoid the boiler tube damage that fractures under the effect of additional bending moment.

More preferably, the outer end of described two boiler tube ends cover also is fixed with balancing disk.Balancing disk can balance boiler tube end cover be attached to the moment of flexure on the boiler tube, thereby eliminates the additional bending moment that boiler tube bore.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the front view that the little moment of torsion of the utility model does not have additional bending moment single tube high temperature furnace.

Fig. 2 has represented that the length variations of boiler tube causes the variation of transmission hanging belt drift angle.

Fig. 3 is the left view of Fig. 1.

The specific embodiment

A kind of little moment of torsion of the present utility model does not have additional bending moment single tube high temperature furnace such as Fig. 1, shown in Figure 3, and the outside of cylindrical shape boiler tube 1 is provided with the heater that is made of heating 8, and goods to be sintered are placed on the inside of boiler tube 1, and the two ends of boiler tube 1 are by 2 shutoff of stove plug.Power transmission shaft 7 be positioned at boiler tube 1 directly over, power transmission shaft 7 is installed on the support 10 by two bearing blocks 6, an end of power transmission shaft 7 is fixed with sprocket wheel 9, motor direct-connection type cycloidal planetary gear speed reducer 14 is connected with sprocket wheel 9 by the chain transmission, rotates thereby drive power transmission shaft 7.The two ends of boiler tube 1 are provided with two boiler tube end covers 12, and boiler tube end cover 12 is enclosed within the outside of boiler tube 1 and fixedlys connected with boiler tube 1 by high temperature adhesive.The wall thickness of boiler tube end cover 12 can be thicker, fix a driven pulley 3 on each boiler tube end cover 12, each fixes a driving pulley 5 two ends of power transmission shaft 7, be connected by transmission hanging belt 4 between driving pulley 5 and the driven pulley 3, boiler tube 1 is suspended on the transmission hanging belt 4 at two ends, and its weight is born by transmission hanging belt 4 fully.Transmission hanging belt 4 not only can drive boiler tube 1 and rotate, and the support of a flexibility also is provided for boiler tube 1, and when there was the out-of-alignment phenomenon in boiler tube 1 two ends, this flexible support can not produce additional bending moment on boiler tube 1.Compare with one-sided transmission, this bilateral transmission can reduce the moment of torsion that boiler tube 1 is born greatly; When the transmission of both sides is asynchronous, relative slip can take place between transmission hanging belt 4 and the belt wheel, can eliminate the destructive moment of torsion that is applied on the boiler tube 1 because of asynchronous automatically.For balance boiler tube end cover 12 moments of flexure that are attached on the boiler tube 1, also be fixed with balancing disk 13 in the outer end of two boiler tube end covers 12.

Also be fixed with reinforcement 11 between two boiler tube end covers 12, reinforcement 11 and boiler tube 1, boiler tube end cover 12 are the same all to be to be made by corundum material, reinforcement 11 parallels and is close on the outer surface of boiler tube 1 with the axis of boiler tube 1, and the two ends of reinforcement 11 are connected by the end face of high temperature adhesive with two boiler tube end covers 12.Several reinforcements 11 stick on the outside of boiler tube 1 vertically, form a cage construction together with two boiler tube end covers 12, diameter becomes big when boiler tube 1 expanded by heating, and reinforcement 11 can limit the radial deformation of boiler tube 1, boiler tube 1 is applied radial pressure, not for the furnace tube material of tension, this radial pressure can improve the intensity of boiler tube for resistance to compression, avoids the boiler tube damage that fractures under the effect of additional bending moment.The quantity of reinforcement 11 should be reasonable, both can improve the intensity of boiler tube 1, and the heat transfer property that is unlikely again boiler tube 1 simultaneously causes too big influence.

When boiler tube 1 is heated to operating temperature by normal temperature, boiler tube can extend, will cause that so initiatively the relative position between the driven pulley 3,5 is offset, in order not limit the freedom of expanding with heat and contract with cold of boiler tube, the drift angle of controlling transmission hanging belt 4 simultaneously is in the working range that allows, on the one hand should appropriate design power transmission shaft 7 and the spacing of boiler tube 1, can make between two driven pulleys 3 at normal temperatures distance than the short A/2 of the distance between two driving pulleys 5 on the other hand, wherein the A elongation that is boiler tube 1 when normal temperature is raised to operating temperature.As shown in Figure 2, normal temperature underdrive hanging belt 4 deflections are inboard, when boiler tube 1 reaches operating temperature, boiler tube elongation A, distance between two driven pulleys is than the distance A/2 between two driving pulleys, the position of transmission hanging belt biased outward 4 ', and transmission this moment hanging belt has an axial thrust load to the active force of boiler tube, this axial thrust load makes boiler tube produce axial compression stress, and this axial compression stress can improve the bending strength of boiler tube.And when boiler tube stretched, initiatively the inclined to one side square between the driven pulley 3,5 can not surpass A/4, thereby makes the drift angle minimum of transmission hanging belt 4.

Claims (5)

1. a little moment of torsion does not have additional bending moment single tube high temperature furnace, comprise boiler tube (1) and be positioned at the heater of boiler tube outside, it is characterized in that: also comprise a power transmission shaft (7) that is installed in directly over the boiler tube (1), described power transmission shaft (7) is connected with transmission mechanism, each fixes a driving pulley (5) two ends of power transmission shaft (7), each fixes a driven pulley (3) two ends of described boiler tube (1), be connected by transmission hanging belt (4) between described driving pulley (5) and the driven pulley (3), described boiler tube (1) is suspended on the transmission hanging belt (4).

2. little moment of torsion according to claim 1 does not have additional bending moment single tube high temperature furnace, it is characterized in that: the distance between described two driven pulleys (3) under the normal temperature is than the short A/2 of distance between two driving pulleys (5), wherein the A elongation that is described boiler tube (1) when normal temperature is raised to operating temperature.

3. little moment of torsion according to claim 1 does not have additional bending moment single tube high temperature furnace, it is characterized in that: also comprise two boiler tube end covers (12) that are enclosed within boiler tube (1) two ends, fixedly connected between described boiler tube end cover (12) and the boiler tube (1), described driven pulley (3) is fixed on the boiler tube end cover (12).

4. little moment of torsion according to claim 3 does not have additional bending moment single tube high temperature furnace, it is characterized in that: also be fixed with reinforcement (11) between described two boiler tube end covers (12), described reinforcement (11) is close on the outer surface of boiler tube (1) and fixedlys connected with boiler tube (1) simultaneously.

5. little moment of torsion according to claim 3 does not have additional bending moment single tube high temperature furnace, it is characterized in that: the outer end of described two boiler tube end covers (12) also is fixed with balancing disk (13).

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