DE202014007324U1 - Mobile heating device for heating asphalt granules - Google Patents

Abstract

A portable asphalt heater (1) for heating and keeping granular asphalt having a heating and mixing chamber (2) having an inlet (4) for filling granular asphalt and an outlet (6) for discharging heated asphalt A heater (14) for heating asphalt in the chamber (2) and a drivable auger (20) for mixing and conveying asphalt in the chamber (2) between the inlet (4) and the outlet (6).

Description

The invention relates to a transportable asphalt heater for heating and keeping granular asphalt having a heating and mixing chamber having an inlet for filling granular asphalt and an outlet for discharging heated asphalt, and a heater for heating in the chamber befindlichem Asphalt.

In road construction, there is a need to repair defects such as cracks, potholes and the like quickly, inexpensively and permanently. So far, usually larger, the flaw-containing sections are cut or milled out of the road surface and then after a clean with new asphalt, which is provided for example from Alphaltkochern filled. A disadvantage of this, however, is the high cost, which is caused in particular by equipment such As asphalt planers and Asphaltkocher. Even if such repaired defects usually have a good quality, the costs are quite high.

Suitable, such. For example, the above-described construction methods for the maintenance of asphalt roads of great extent and / or depth are generally described in the relevant regulations and leaflets, for example in the "Additional Technical Terms of Contract (ZTV) -asphalt" and in the ZTV BEA - StB 09. The structural measures described in the above regulations mainly require the use of large equipment with correspondingly high staff requirements. Economically applicable, the known structural measures only for larger areas and high volume requirements. In particular, the conventional methods can not economically and / or permanently eliminate small-volume damage phenomena of non-uniform nature, such as, for example, differently deep and wide holes, cavities, punctures, gaps, gaping cracks, flat erosion and the like.

In addition to these repair methods with large equipment there is also the possibility to eliminate individual defects using repair materials, such as repair asphalt. For example, in DE 100 10 451 A1 proposed a method for producing a thermoplastic filling material for the removal of surface damage in concrete or asphalt surfaces or for incorporation in joints of buildings. The material is present as a granular-granular small granules and can be transformed by heating in a pourable or spreadable filler with high adhesive strength. The heating takes place in particular by hand, for example by means of a gas burner. The granules are filled for example in a pothole and heated from the top with a gas burner. The disadvantage here is that a uniform heating of the granules is difficult, especially in winter repairs. In addition, the heating requires a high degree of skill and experience so as not to exceed the flash point of about 350 ° C of the bitumen in the asphalt. Another disadvantage is that a user can not or only with difficulty determine whether the granulate is sufficiently warmed through, for example, also at the contact surface with a surface of the pothole to be filled, so as to enter into a firm and permanent connection with the road surface. High quality repairs are difficult to produce.

It is therefore an object of the present invention to provide an asphalt heater by means of which the abovementioned problems of heating asphalt, in particular repair asphalt, are at least partially eliminated.

The invention therefore achieves the object with a transportable asphalt heating device according to claim 1. The transportable asphalt heating device for heating and keeping asphalt therefore has a heating and mixing chamber having an inlet for filling granular asphalt and an outlet for discharging heated asphalt, and a heater for heating asphalt in the chamber, and a drivable auger for mixing and conveying in-chamber asphalt between the inlet and the outlet. To heat the asphalt, this is thus filled in the inlet of the heating and mixing chamber. The chamber is heated by means of the heating device, and at the same time the material in the chamber heats up. By means of the screw conveyor is in the chamber befindlichem asphalt moved back and forth and thus mixed and conveyed. For this purpose, the screw conveyor is rotatable in at least one direction. It can be provided that the conveyor screw for reciprocating the granules is rotatable in two directions. Likewise, it can be provided that the screw conveyor is rotatable in only one direction and the granules automatically, for example. By means of corresponding deflecting elements and / or passages in the screw conveyor and / or the housing against a conveying direction of the screw conveyor can be conveyed. On the one hand, the auger has the function of conveying the asphalt in the chamber from the inlet to the outlet and, on the other hand, of mixing it simultaneously, thereby achieving a uniform heating of the repair asphalt. Preferably, the asphalt can be conveyed out of the outlet by means of the screw conveyor.

As asphalt, especially repair asphalt, is preferably in DE 10 2013 224 894 of the used by the present applicant. The asphalt mixture described therein is characterized in that it contains or consists of a / a mineral mixture containing or consisting of 9-15 M .-% filler, 57-91 M .-% fine aggregate 0/2, 0-28 M. -% coarse aggregate 2/5, based in each case on the mineral mixture, and 5-10 M .-% binder, based on the asphalt mixture. An example of such an asphalt mixture is a composition consisting of 10% by mass filler (100% by mass limestone flour), 65.0% by mass natural sand 0/2 with corresponding oversize, 25% by mass coarse aggregate 2 / 5, and binder 70/100 plus 3.0 mass% sasobit (FT wax), the total binder content being 7.5 mass%. This composition is preferably heated to a temperature of 180 ° C and mixed. The resulting mixture is then preferably subsequently cooled to a temperature of 20 ° C. The product thus obtained is then broken down into particles with a particle size of at most 12 mm. Although such asphalt is particularly preferred, it is also possible to use other types of asphalt or repair asphalt, especially asphalt granules.

According to a first preferred embodiment, the chamber has a substantially cylindrical shape, and the screw conveyor extends substantially coaxially with and within a central axis of the chamber. As a result, a particularly good conveying and heating is achieved.

It is preferred that the screw conveyor extends substantially completely through the chamber. Thus, the chamber is utilized in its full length. Conveying from the inlet to the outlet can be done with a substantially uniform heating and thus heating of the asphalt.

Furthermore, it is preferred that the conveyor screw is rotatably mounted on two opposite end sides of the chamber. As a result, a good support of the screw conveyor is achieved. The bearings may preferably be designed as plain bearings or roller bearings. For this purpose, the chamber preferably has two end faces, which preferably extend substantially perpendicular to a central axis of the chamber. In particular, in one embodiment with plain bearings is preferred that a lubricating nipple for supplying lubricant is provided in the plain bearing on a housing portion surrounding the sliding bearing. As a result, lubricant can be supplied under pressure into the sliding bearing whereby dirt particles can be pressed out of the sliding bearing so that the sliding bearing is cleaned.

According to a preferred embodiment, the inlet and the outlet are arranged at two opposite ends of the chamber. Preferably, the inlet and the outlet are located near the front ends of the chamber. This makes it possible to introduce asphalt to be heated at a front end in the chamber and omit at the opposite end face of the chamber. As a result, a positive guidance for the asphalt is achieved because it is necessary to guide this at least once completely through the chamber to omit this. As a result, a particularly good heating of the asphalt is achieved.

In an alternative, the inlet and the outlet are located at the same front end of the chamber. As a result, a compact design can be achieved, and for a user, it is possible to introduce the granules at the same front end and remove from the Asphaltheizvorrichtung, whereby the handling in operation is simplified.

According to a further preferred embodiment, a gap is provided between a blade of the screw conveyor and a radially inner wall of the chamber. This gap preferably has a width in a range of 0.2 cm to 2 cm, preferably 0.5 cm to 1.5 cm, more preferably 0.8 cm to 1.2 cm, most preferably about 1 cm. These values are relative to a radial direction between a blade tip and the wall. Such a gap width means that on the one hand asphalt within the chamber by means of the screw conveyor is efficiently conveyed back and forth and on the other hand, that the screw conveyor is not jammed due to adhering to a chamber inner wall residues and the operation of the Asphaltheizvorrichtung is hindered. The individual grains of the asphalt, preferably in the form of granules, preferably have a maximum size of 1.2 cm, so that they can be conveyed at the most preferred gap width of 1 cm. Smaller particles of the granules may slip between the auger and the radially inner wall of the chamber. However, this is also preferred, as it supports a cleaning of adhering to an inner wall material. The individual particles of the granules have an abrasive and, in a heated state, an additional adhesive action and thus support the removal of bitumen residues on the inner wall.

According to a further preferred embodiment, the screw conveyor on at least two threads, preferably at least 2.5 threads, more preferably exactly 2.5 threads. It has been shown that 2.5 threads on the one hand enable a favorable size of the Asphaltheizvorrichtung, on the other hand, both a uniform soak of the asphalt as well as a rapid promotion. In a screw conveyor with 2.5 turns, a guided material with about two revolutions of the screw conveyor from one end of the screw conveyor to the other end of the screw can be brought, wherein the asphalt is completely passed through the chamber. The additional half thread serves as a buffer or compensation space, which allows a smooth conveying. In a screw conveyor with 2.5 threads of the asphalt is divided at an assumed filling level of the chamber below the central axis in horizontal alignment in three or four chambers, whereby an advantageous mixing and uniform heating is achieved.

Preferably, the screw conveyor on at least one axial end to a radially extending end plate. The end plate prevents that when mixing and / or conveying the asphalt or asphalt granules in the chamber, this is pressed against an end wall of the chamber, whereby it can interfere with the rotation of the screw conveyor. In addition, granules can be repelled by the end plate, which results in better mixing. The end plate preferably follows the last thread and is formed from the screw blade. The end plate preferably corresponds to a stepless passage.

Preferably, the screw conveyor additionally has a plurality of axial passages, preferably radially adjacent to a central axis of the conveyor screw. For example, the screw blade extends at a distance to a central shaft of the screw conveyor, whereby the passages are formed. As a result, material can be conveyed in a region near an inner wall of the chamber, while in a region radially adjacent to a central axis of the screw conveyor, material can pass from one passage to the next. This prevents clogging and excessive damming of the granules, and asphalt is particularly preferably mixed.

According to a further preferred embodiment, the heating device has at least one gas burner. Preferably, the heating device has at least four gas burners. Gas burners are a particularly easy way to heat the chamber. Gas burners may be used as an energy source with a portable gas bottle which may be located in the immediate vicinity of the asphalt heater or may be part of the asphalt heater. Such a heater is therefore essentially autonomously operable and requires no further energy sources. Further, a heater having one or more, preferably four, gas burner, adjustable in a simple manner. It is thus preferred that a gas volume flow to the gas burner or burners is adjustable and adjustable. Preferably, each gas burner has a power of 20 kW to 60 kW, preferably 40 kW to 50 kW. Furthermore, it is preferred that a distance between the gas burners and the chamber is adjustable, for example by means of one or more screws or one or more locking means.

Alternatively or additionally, the heating device has at least one thermal oil heater. A thermal oil heater preferably has an electric heating source or is operated by means of one or more gas burners. Furthermore, the thermal oil heater has a pump by means of which oil is circulated through channels. Preferably, the channels extend substantially along the entire chamber wall. As a result, a particularly uniform heating of the chamber and a particularly uniform heating of the asphalt within the chamber can be achieved.

In a preferred development, the heating device has at least one tubular heater with a plurality of gas outlets. The tubular heater is preferably formed as a gas line with a plurality of holes that serve as gas outlets. As a result, a particularly uniform heating of the chamber is possible and also the heater is inexpensive to produce.

Furthermore, the heating device alternatively or additionally preferably has a microwave heating. Microwave heating is also a particularly easy way to heat asphalt in the chamber. The microwave heating preferably has at least one magnetron.

According to a further preferred embodiment, the chamber has a housing which is at least partially double-walled. Preferably, the chamber is substantially cylindrical, and the housing is preferably double-walled along the cylindrical surface, at least along a substantial portion of the circumference, at least two-thirds or three-quarters or four-fifths along the circumference of the cylinder surface. By the housing is at least partially double-walled, it offers on the one hand an increased stability, on the other hand, the gap can be used as an insulator and / or for the heater. The housing is preferably formed from a sheet metal material.

Accordingly, it is preferably further provided that the housing has an inner wall bounding the chamber and an outer wall at least partially encircling the inner wall. These two walls are preferably firmly connected. Preferably, the inner and outer walls are formed from a sheet metal material. Furthermore, it is preferably provided that the heating device is at least partially disposed in a space between the inner wall and the outer wall. If, for example, the heating device has at least one gas burner, it is preferably provided that it projects at least partially into the interspace, so that a flame of the gas burner heats the interspace. The heated air from the flame of the gas burner and the hot combustion gases then flow within the space and thus heat the inner wall substantially completely, whereby the chamber and thus the asphalt within the chamber are heated particularly evenly. If the heating device has an alternative or in addition a thermal oil heating, preferably channels of the thermal oil heating run within the intermediate space.

In a preferred development, the outer wall has at least one exhaust gas opening for discharging exhaust gases of the heating device. This is particularly preferred if the heating device has at least one gas burner. The exhaust port is preferably arranged in a usual horizontal orientation of the asphalt device in the operating position above, so that hot exhaust gas can flow out automatically. The exhaust gas outlet positively influences a chimney effect, whereby a heating of the chamber is more effectively achievable. A larger total opening area has a positive effect on this.

According to a further preferred embodiment, a preheat storage for preheating asphalt is provided on the housing, which is adapted to pre-heat in the preheat storage asphalt by means of exhaust gases of the heater. For example, the preheat storage is designed as a container, which is arranged above the exhaust opening. As a result, the Vorheizspeicher is flowed during operation of the Asphaltheizvorrichtung with hot exhaust gas and heated. As a result, asphalt is also preheated in the preheating storage. Subsequently, the thus preheated asphalt can be fed through the inlet into the chamber. As a result, the heating time inside the chamber is shortened, whereby a repair of multiple defects or a larger defect can be shortened. Preferably, the Vorheizspeicher is pivotally formed, such that by pivoting or tilting of the preheat storage of asphalt therein can be poured into the inlet of the chamber. This is a particularly simple way to supply the asphalt located in the preheat storage chamber.

Furthermore, it is preferably provided that a closing device for closing the outlet is provided at the outlet. This ensures that during the heating and keeping the asphalt warm inside the chamber it is closed and the asphalt can not escape unintentionally. The closing device preferably has handling means for selectively opening the closing device.

In a preferred embodiment, the closing device has a pivotable flap. The flap is for example pivotable about an axis which is parallel to a central axis of the chamber. The flap thus acts like a sliding door. Alternatively, the flap is pivotable about an axis which is perpendicular to the central axis of the chamber. In both alternatives, locking means are preferably provided, by means of which the flap can be locked in the closed and / or opened state.

In a further advantageous embodiment, the closing device has a chute for guiding heated asphalt discharged from the outlet. Preferably, the flap is designed as a chute. This makes it possible to controlled heated asphalt and targeted to a specific defect. Preferably, a distal end of the chute in the unfolded state is preferably about 20 cm to 30 cm above a floor in which there is a defect to be repaired. This is a particularly ergonomic height at which an operator can easily fill a fault with the asphalt.

According to a further preferred embodiment, an inlet device, preferably an inlet funnel, is provided at the inlet. The inlet device or the inlet funnel are preferably in an erected condition of the asphalt heater at a height above a floor of 60 cm to 100 cm, preferably 70 cm to 90 cm, particularly preferably 70 cm to 80 cm. Thus, the inlet device is on a particularly ergonomic for a manual insertion of asphalt in the inlet height.

Furthermore, a closing device for closing the inlet is preferably provided at the inlet. This prevents heat from excessively escaping from the inlet during heating. The closing means of the inlet preferably comprises handling means for manually opening and closing the closing means and preferably locking means for locking the closed or opened position.

According to a further preferred embodiment, the asphalt heating device has a drive device for rotationally driving the conveyor screw. In a preferred development, the drive device has a hand crank for rotationally driving the conveyor screw. Thus, the Asphaltheizvorrichtung is easy to operate manually, and an operator can drive the auger by means of the hand crank. As a result, the Asphaltheizvorrichtung is still self-sufficient from external energy sources. It is also a simple mechanical solution that is robust. In an alternative, an electric motor is provided by means of which the screw conveyor is driven in rotation. The motor has one, preferably two, directions of rotation, so that the screw conveyor is rotatable both in one direction and in the other direction, left and right. The engine preferably has an operating unit for controlling the engine. In a preferred embodiment of the engine, an electronic control is further provided which is preprogrammed or preprogrammed, and is preferably prepared and adapted for the asphalt to be heated. The controller is preferably programmed to cause the motor to rotate the auger leftward a predetermined number of revolutions, wait a predetermined time, rotate the auger to the right a predetermined number of revolutions, wait for a predetermined time, and then in turn, rotate the auger a predetermined number of revolutions to the left. These steps can be repeated twice or more. The controller is preferably programmed so that the asphalt has a temperature of at least 140 ° C, is sufficiently mixed, but has a lower temperature than 250 ° C, preferably 180 ° C. For this purpose, the controller is preferably coupled to a temperature sensor and a torque sensor on the engine. As the temperature of the asphalt granules in the chamber increases, the viscosity does not decrease, and a moment necessary to drive the auger decreases accordingly. Achieving a certain drive torque may be used as an indicator of a particular temperature of the asphalt granules.

According to a preferred embodiment, a transmission is further provided between the drive device and the screw conveyor, preferably with a ratio i = 2, more preferably i = 3. Depending on which amount of asphalt is provided for the chamber, a transmission is preferred to a Driving the auger easier. A transmission is particularly preferred in a manual drive. It has been shown, for example, that a capacity of about 10 kg can be handled manually without gear. At 15 or 20 kg, this is far more difficult, depending on the design of the screw conveyor, so that a transmission which preferably has a torque-reducing effect relative to the drive device is preferred here.

According to another preferred embodiment of the invention, the asphalt heater comprises a frame with at least one wheel for moving the asphalt heater, and at least one handle for manually gripping and guiding the asphalt heater. Preferably, at least two wheels are provided which are interconnected by means of an axle and rotatably mounted on the frame. As a result, the Asphaltheizvorrichtung preferably can be moved manually, for example, on a construction site or the like. Alternatively, it is also conceivable to pull the asphalt heater with a vehicle.

According to such an embodiment, it is further preferred that two handles are provided at a distance from each other, wherein the handles in a set condition of Asphaltheizvorrichtung above a floor at a height of 40 cm to 80 cm, preferably 50 cm to 70 cm, particularly preferred are arranged in about 60 cm. The two handles are preferably designed in the manner of a wheelbarrow. Also, the height of the handles on a floor is about the handle of a commercial wheelbarrow. The handles preferably have such a height from the ground that an average operator can grasp them standing up and lift the asphalt heater in a standing position. It has been found that such a height is particularly ergonomic for an average operator and so ergonomic operability of the Asphaltheizvorrichtung is reached.

It is further preferred that the frame has a first and a second support, wherein at least one wheel is fastened to a foot end of the first support. The first and second supports are preferably arranged laterally with respect to a vertical perpendicular of a center of gravity of the asphalt heater, preferably each with the same distance to the center of gravity. Preferably, the first support is arranged in the region of a first end face of the chamber and the second support in the region of the second end face of the chamber. Each post may have one or more legs. The second support preferably has a support leg. Alternatively, at least one wheel, preferably two wheels, are also provided on the second support. The at least one wheel of the first support and / or the at least one wheel of the second support are reversibly detachable.

In a preferred development, the frame has a flap device, by means of which the Asphaltheizvorrichtung of a set up Position can be brought into a folded position. Alternatively, the frame is removable, for example, frame and housing and / or chamber are coupled by means of a reversibly releasable positive connection. Preferably, the frame is removable without tools in this variant and / or can be folded without tools.

Preferably, the flap device is designed such that the first and second support are pivotally hinged to the frame and the flap means comprises means for pivoting and locking the first and second support in a pivoted or unverschwenkten position. In the untwisted position, the first and second supports are aligned with a longitudinal axis thereof substantially perpendicular or slightly oblique to a central axis of the chamber. In the pivoted, that is folded, state, the first and second support are preferably aligned substantially parallel to a central axis of the chamber and thus extend adjacent along the housing. As locking preferably a snap mechanism with locking lug or the like is provided. Preferably, an extendable piston is provided for pivoting the first and second support. Preferably, the first and second supports are hinged together, for example, by a connecting strut, coupled. As a result, the first and second support are similar to a parallelogram with respect to the housing of the Asphaltheizvorrichtung swiveled and so retractable. In the folded-in state, the asphalt heater preferably has such a compact design that it can be brought into the trunk of a passenger car, for example.

Particularly preferably, the axis of the at least one wheel is in the folded state approximately in a plane with the vertical perpendicular of a center of gravity of the Asphaltheizvorrichtung. As a result, the Asphaltheizvorrichtung is particularly advantageous supported in the folded state on the at least one wheel and can be moved manually in a particularly simple manner.

The invention will be explained in more detail below with reference to two exemplary embodiments with reference to the enclosed figures. Showing:

1 a side view of an asphalt heater according to a first embodiment;

2 a rear view of the asphalt heater off 1 ;

3 a front view of the asphalt heater 1 ;

4 a cross section through the chamber and the housing of the Asphaltheizvorrichtung 1 ;

5 a plan view of the Asphaltheizvorrichtung 1 ;

6 a side perspective view of an asphalt heater according to a second embodiment;

7 the asphalt heater off 6 with a preheater in a filling position;

8th the asphalt heater from the 6 and 7 in a second configuration;

9 the asphalt heater from the 6 to 8th in a third configuration;

10 the asphalt heater from the 6 to 9 in a plan view;

11 the asphalt heater off 6 in another perspective;

12 the asphalt heater from the 6 to 11 in a fourth configuration;

13 the asphalt heater off 12 in a bottom view; and

14 a side view of a screw conveyor.

In 1 is a portable asphalt heater 1 for heating and keeping hot asphalt according to a first embodiment shown in a side view. The asphalt heater has a heating and mixing chamber 2 on which an inlet 4 as well as an outlet 6 (see also 3 ) having. The heating and mixing chamber 2 is according to this embodiment with a housing 8th surround. The heating and mixing chamber 2 has a substantially cylindrical shape and extends along the central axis A. The housing 8th also has a substantially cylindrical shape and extends coaxially with the central axis A. According to this embodiment, the inlet 4 near the first front 10 of the housing 8th arranged, and the outlet 6 is in the second front 12 of the housing 8th arranged. The front ends 8th . 10 are each formed as substantially flat walls.

The asphalt heater 1 also has a heater 14 on, according to this embodiment, four gas burner 16a . 16b . 16c . 16d , in total with 292 + 46 + has designated (see 4 ). The heater 14 serves to in the chamber 2 to heat up the asphalt and keep it warm. This will be described in more detail below.

Inside the chamber 2 is a screw conveyor 20 for mixing and conveying in the chamber 2 located asphalt from the inlet 4 to the outlet 6 provided (see 4 ). The screw conveyor 20 has a central shaft 22 on, which is substantially coaxial with the central axis A through the entire chamber 2 extends. The wave 22 the screw conveyor 20 is on the two front sides 10 . 12 of the housing 8th in appropriate camps 24 . 26 taken, which is the wave 22 support and allow a rotation of this. At the first end 10 of the housing 8th the shaft extends 22 with a section 28 out of the case 8th and the camp 24 out and is there with a winch 30 (please refer 1 ) torque transmitting coupled. The winch 30 has a lever 32 and a handle 34 on. By means of the hand crank 30 is the screw conveyor 20 rotatably drivable.

The screw conveyor 20 also has a screw blade 36 on which is helical around the shaft 22 extends. According to this embodiment, the auger 20 two courses 38 . 39 on, which in each case from a complete wrapping of the shaft 22 through the sheet 36 are formed. In other embodiments, three, four, five or more gears are provided.

As in particular from 4 As can be seen, the worm blade extends 36 in the axial direction, relative to the central axis A, substantially to the two end faces 10 . 12 of the housing 8th approach. In the radial direction, the worm blade extends 36 to an inner wall 40 that the chamber 2 radially internally limited. In alternative embodiments, there is between the worm blade 36 and the inner wall 40 Provided a gap in the radial direction.

Like also very good 4 can be seen, is the case 8th partially executed double-walled according to this embodiment. The housing 8th consists of an inner wall 40 , which is cylindrical and a boundary for the chamber 2 forms. The inner wall 40 is by means of screws 42 each with the front sides 10 . 12 of the housing 8th connected. Around this inner wall 40 is at a distance D an outer wall 44 arranged, which the inner wall 40 almost completely radially outwardly enclosing, but at an underside of the chamber 2 , based on a conventional installation of Asphaltheizvorrichtung 1 like in the 1 . 2 and 3 shown in two legs extending away from the chamber 46 . 48 ends. In the sectional view in 4 is therefore only a thigh 46 to see. The outer wall 44 is again by means of screws 42 with the front sides 10 . 12 of the housing 8th connected.

The thigh 46 . 48 form a lateral protection for the heater 14 , and the heater 14 which according to this embodiment four gas burners 16a . 16b . 16c . 16d has, extends between the legs 46 . 48 and so in a space between the inner wall 40 and the outer wall 44 into it. As a result, on the one hand, a user in front of the open flames of the gas burner 16a . 16b . 16c . 16d protected (compare 1 ); the gas burners 16 are between the thighs 46 . 48 and will be in 1 from the thigh 48 On the other hand, the flames of the gas burners heat up 16a . 16b . 16c . 16d the space between the inner wall 40 and the outer wall 44 , whereby a particularly good heat transfer is achieved. As turn out 4 Flames of the gas burners can be seen here 16a . 16b . 16c . 16d immediately with the inner wall 40 at the bottom of the chamber 2 based on 4 in contact and heat them directly. For exhausting exhaust gases, such as combustion gases, the outer wall has 44 of the housing 8th a plurality of exhaust ports 50 on (see 5 ), which are formed according to this embodiment as a plurality of slots, which at an upper side of the housing 8th , based on a usual list (cf. 1 ) are arranged.

The asphalt heater 1 according to this embodiment ( 1 to 5 ) also has a frame 52 on. The frame 52 according to this embodiment, two each laterally from the housing 8th arranged substantially U-shaped bracket 54 . 56 on, which are aligned so that the two legs of the U vertically downwards on a footprint, in a usual erected state as in 1 shown, wise. The two stirrups 54 . 56 are formed substantially identical, for example. As a bent metal tube. In the area of the front sides 10 . 12 of the housing 8th are the two temples 54 . 56 by means of one strut each 58 . 60 coupled together. At this quest 58 . 60 is according to this embodiment, the housing 8th by means of screws 62 (in 2 and 3 only one provided with reference numerals) attached.

The legs of the U-shaped bracket 54 . 56 at the first end 10 are arranged together form a first support 64 and the opposite legs, at the second end face 12 are arranged, a second support 66 , In 3 is therefore only the second support 66 to see while in 2 only the first support 64 you can see.

At the first support 64 are two wheels 68 . 69 arranged by means of an axis 70 are connected. The axis 70 passes through two camps 71 . 72 in the thighs of the hanger 54 . 56 are arranged, which are the first support 64 form. The thighs, the second support together 66 form, are not provided according to this embodiment with rollers, but with support feet 73 . 74 , At the strut 60 is also a handle 76 arranged, with which a server the asphalt heater 1 on the side of the handle 76 , so on the side of the second end face 12 so can raise that the support feet 73 . 74 come out of contact with a ground and so the asphalt heater by means of the rollers 68 . 69 can be moved. The handle 76 is by means of a hinge 78 at the strut 60 attached so that it is foldable. As a result, the size of the Asphaltheizvorrichtung 1 reducible, so that it is easier to stow, for example, on a cargo bed or in the interior of a car.

In relation to the usual installation of the asphalt heater 1 lower area is also a holding strut 80 for the heater 14 intended. The holding strut 80 extends according to this embodiment between the end faces 10 . 12 (compare in particular 4 ), but also on the temples 54 . 56 be attached. The holding strut 80 serves to heat the heater 14 to hold in a corresponding position. Preferably, adjusting means are provided, by means of which the position of the heating device 14 relative to the strut 80 and / or to the chamber 2 is changeable.

The heating and keeping warm of an asphalt is then preferably carried out as described below: The asphalt is preferably present as granules, preferably as in DE 10 2013 224 894 A1 described. The chamber preferably has an axial length of about 70 cm and a diameter of about 35 cm. That is, the chamber has a volume of about 0.05 m ³ . Are the burners on each a corresponding power (each burner 16a . 16b . 16c . 16d provides maximum power of 54 kW), it has been shown that with the asphalt heater described above 1 (please refer 1 to 5 ) about 10 kg of asphalt granules within 2-6 minutes, depending on the skill of an operator and set power of the burner, can be heated. The asphalt granulate is added by hand into the inlet 4 the chamber 2 introduced. Then or at the same time, the hand crank 30 operated and thereby the screw conveyor 20 rotationally driven. As a result, asphalt granules are inside the chamber 2 from the inlet 4 in the direction of the outlet 6 transported along the inner wall 40 guided and mixed by the mechanical stress.

The filling level inside the chamber 2 is below the horizontal plane containing the central axis A at the above described values. As a result, the asphalt granules lie essentially on the lower side of the wall 40 on which directly through the flames of the gas burner 16a . 16b . 16c . 16d is heated. Now by means of the hand crank 30 the screw conveyor 20 alternately turned to the left and to the right and so the asphalt within the chamber 2 moved back and forth and mixed. After a crank turn or a half turn of the crank, it may take a few seconds to reach the hand crank 30 is moved on. After about 2-6 minutes, the asphalt granules has reached a temperature above 140 ° C, preferably 180 ° C but below 250 ° C and is sufficiently heated to be filled into a defect. This is now the outlet 6 opened and the winch 30 pressed until all the asphalt by means of the screw conveyor 20 from the outlet 6 is carried out. The gas burners 16a . 16b . 16c . 16d can be turned off, or their performance is reduced. In this way, simply a certain amount of asphalt can heat up quickly and evenly and keep warm. As a result, repairs of defects in roads and the like can be repaired quickly, inexpensively and with high quality.

In the 6 to 13 A second embodiment of the asphalt heater according to the present invention is shown. The same and similar elements are provided with the same reference numerals, and thus to the full extent the above description of the Asphaltheizvorrichtung 1 according to the 1 to 5 Referenced.

The asphalt heater 1 according to the second embodiment, in turn, has a heating and mixing chamber 2 on which an inlet 4 as well as the outlet 6 having. The heating and mixing chamber 2 is according to this second embodiment of a housing 8th surround. The heating and mixing chamber 2 has a substantially cylindrical shape and extends along a central axis A. The housing 8th also has a substantially cylindrical shape and extends coaxially with the central axis A. According to this embodiment, the inlet 4 near the first front 10 of the housing 8th arranged and the outlet 6 is in the second front 12 of the housing 8th arranged. The front ends 8th . 10 are each formed as substantially flat walls.

Inside the heating and mixing chamber 2 is a screw conveyor, not shown (see, for example 14 ) arranged. For actuating the screw conveyor 20 is according to this embodiment ( 6 to 13 ) a hand crank 30 provided with a gear 100 connected is. The gear 100 translates the rotation of the hand crank with a ratio of i = 3, such that three full turns of the hand crank 30 a full turn of the screw conveyor 20 correspond.

At the inlet 4 is a flap 102 provided in accordance with 6 is shown in an open state. The flap 102 can between the in 6 illustrated open position and an in 8th shown closed position to be pivoted back and forth. The flap 102 at the same time serves as a filling shaft, over the granular asphalt into the heating and mixing chamber 2 can be filled. Accordingly, the asphalt heater 1 according to this embodiment at the outlet 6 a flap 104 on, which also between an open position (see 6 ) and a closed position (see, for example 11 ) is pivotable back and forth. Also the flap 104 serves as a shaft or chute for heated asphalt. This allows this location from the heating and mixing chamber 2 be filled into a hole to be filled.

In contrast to the first embodiment, the Asphaltheizvorrichtung 1 according to the second embodiment ( 6 to 13 ) Further, a preheater 106 on top of the housing in an upper section 8th is attached. The preheater 106 includes a container 108 that has a hinge 110 swiveling in the housing 108 is arranged. At one to the inlet 4 facing side 112 of the container 108 is this open. The preheater is used to preheat granular asphalt. For this, this is in the container 108 filled. Hot exhaust gas, which from exhaust ports (in the 6 to 13 Not shown; see. 1 to 5 ) emits, heats the container 108 and thereby present in this granules. If this is sufficiently preheated, the flap 102 at the inlet 4 opened and the container 108 , as in 7 shown pivoted in a filling position, in the granules from the container 108 over the flap 102 in the heating and mixing chamber 2 is fillable. This makes it possible to rapidly heat several batches of granular asphalt in rapid succession and to use for the repair of defects in roads or the like.

At the asphalt heater 1 according to the second embodiment is further on one side of the housing 8th a bracket 114 intended. The holder 114 consists of a foot part 116 as well as a wall 118 , The holder 114 serves to accommodate a gas cylinder to a heater (in the 6 to 13 not shown), which gas burner has to supply gas. The wall 118 comprises an insulating material to prevent the gas cylinder (not shown in the figures) from radiant heat from the housing 8th shield.

Further, the asphalt heater has 1 according to the second embodiment, a frame 52 on which basically comparable to the frame 52 is designed according to the first embodiment, but via a flapper 120 features. The frame 52 according to the second embodiment has two wheels 68 . 69 on and two support feet 73 . 74 , The function of the frame 52 will be related to the 8th and 13 be described in more detail.

According to 8th is the asphalt heater 1 shown in a second configuration, in which the frame 52 by means of the folding mechanism 120 is set in a folded state. For this purpose, the folding mechanism 120 a winch 122 on. A first support 64 at the wheels 68 . 69 are arranged (see 6 ), is pivotable on the housing 8th arranged. Also the second support 66 that with the support feet 73 . 74 is connected, is pivotable with the housing 8th connected. The first support 64 is with the second prop 66 over a push rod 124 coupled, such that the thrust strut 124 along with the prop 64 and the prop 66 forms a parallelogram linkage. By means of the hand crank 122 is the folding mechanism 120 operated and the prop 64 from an unfolded, substantially vertical arrangement (see 6 and 7 ) in a folded position (see 8th ) movable in which the support 64 essentially horizontally below the housing 8th runs. Likewise, the support runs 66 in the folded position ( 8th ) substantially horizontally below the housing 8th as these are over the thrust strut 124 with the first support 64 is coupled. In the folded position are the wheels 68 . 69 essentially centrally below the heating and mixing chamber 2 and so below the case 8th , One focus of the asphalt heater is in this position substantially vertically above the wheels 68 . 69 , This is the Asphaltheizvorrichtung 1 according to this folded state ( 8th ) very easy to move without a user large forces to lift the asphalt heater by means of the handles 76 . 77 would have to raise. In this folded position is also due to the pivoted support 64 , the outlet 6 closer to the ground, so that heated asphalt from the outlet, in particular by means of the flap 104 , can be filled in a precise position in a defect.

In 8th is the asphalt heater 1 also without preheating 106 shown, which is preferably formed reversibly removable. This is further in 9 clarified. 9 shows the asphalt heater 1 in another configuration with the asphalt heater removed 106 , removed bracket 114 as well as removed wheels 68 . 69 , The handles 76 . 77 are still at the asphalt heater 1 mounted, but can also be removed. In this configuration (see 9 ), the Asphaltheizvorrichtung can be transported in a simple manner, for example in the trunk of a car or on a trailer. In addition, the individual elements are like preheater 106 and bracket 114 if necessary at the Asphaltheizvorrichtung 1 mountable and if not needed, reversibly removable.

10 shows the asphalt heater 1 in the configuration according to 9 in a top view. It can be seen in 10 especially the elongated configuration of the housing 8th which extends along the central axis A. The handles 76 . 77 are again not folded. Laterally out of the case 8th out, the winch sticks out 30 that with the gearbox 100 connected is. This is preferably also foldable, or designed reversibly removable. This allows the Asphaltheizvorrichtung 1 in a simple way in the trunk of a car accommodate.

In 12 is also a front view of the Asphaltheizvorrichtung 1 according to 10 shown, on the front side 10 of the housing 8th , According to 12 However, in addition are the handles 76 . 77 put in a folded state. This results in a longitudinal extent along the central axis A of the Asphaltheizvorrichtung 1 further reduced, making it easy to transport.

13 Finally, a bottom view of the asphalt heater according to FIG 8th with the frame 52 in the folded state. You can see that the wheels 68 . 69 over the pushrod 124 with the support feet 73 are coupled. The wheels 68 . 69 are about a first prop 64 with housing 8th pivotally coupled and the support feet 73 . 74 are about a second prop 66 pivotable with the housing 8th coupled. The folding mechanism 120 points next to the hand crank 122 a piston engine 130 on, the one housing 133 has, in the linearly displaceable a piston 134 is arranged. The piston 134 is by means of the hand crank 122 such that it can be actuated in the housing 132 can be moved in and out. The piston 134 is with a distal section 136 with the first support 64 coupled so that they by means of the thrust piston 130 between the collapsed ( 8th . 9 . 10 . 12 and 13 ) and the unfolded position ( 6 . 7 and 11 ) is pivotable back and forth.

14 shows an exemplary embodiment of a screw conveyor 20 , The screw conveyor 20 is essentially like the ones related to 4 related screw conveyor 20 formed and insofar again similar and identical elements are designated by the same reference numerals. The screw conveyor 20 has a wave 22 on, which has a rotation axis Z. To the shaft 22 The snail leaf extends around 36 in a helical way. The snail leaf 36 is essentially formed as a flat metal band, which is helical in spirals around the shaft 22 extends around. Radial between the snail blade 36 and the wave 22 are passages 140 intended. These are formed by the fact that the Schneckenblatt 36 not directly on the shaft 22 rests, but by radial struts 142 (in 14 only one provided with reference numerals) spaced from the shaft 22 is held. When conveying granular asphalt with such a screw conveyor 20 So can granules through the Schneckenblatt 36 be promoted, but with appropriate accumulation of granules through a passage 140 pass through, so "slip" on the Schneckenblatt and so get back a gear. This avoids accumulation of material, causing jamming of the auger 20 is prevented. According to this embodiment are on the screw conveyor 20 also mixing elements 144 provided, extending in a corridor radially from the shaft 22 to further facilitate mixing of material.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10010451 A1 [0004]
• DE 102013224894 [0007]
• DE 102013224894 A1 [0064]

Claims (35)

Transportable asphalt heater ( 1 ) for heating and keeping granular asphalt, with a heating and mixing chamber ( 2 ), which has an inlet ( 4 ) for filling granular asphalt and an outlet ( 6 ) for discharging heated asphalt, a heating device ( 14 ) for heating in the chamber ( 2 ), and a drivable auger ( 20 ) for mixing and conveying in the chamber ( 2 ) asphalt between the inlet ( 4 ) and the outlet ( 6 ). An asphalt heater according to claim 1, wherein the chamber ( 2 ) has a substantially cylindrical shape and the screw conveyor ( 20 ) substantially coaxial with a central axis (A) of the chamber ( 2 ) within the chamber ( 2 ). Asphalt heating device according to one of the preceding claims, wherein the screw conveyor ( 20 ) substantially completely through the chamber ( 2 ). Asphalt heating device according to one of the preceding claims, wherein the screw conveyor ( 20 ) on two opposite end faces ( 10 . 12 ) the chamber ( 2 ) is rotatably mounted. An asphalt heater according to any one of the preceding claims, wherein the inlet ( 4 ) and the outlet ( 6 ) at two opposite ends of the chamber ( 2 ) are arranged. An asphalt heater according to any one of the preceding claims, wherein the inlet ( 4 ) and the outlet ( 6 ) the same front end of the chamber ( 2 ) assigned. An asphalt heater according to any one of the preceding claims, wherein between a screw blade ( 36 ) of the screw conveyor ( 20 ) and a radially inner wall ( 40 ) the chamber ( 2 ) A gap is provided. An asphalt heater according to claim 7, wherein the gap is in a range of 0.2 cm to 2 cm, preferably 0.5 cm to 1.5 cm, more preferably 0.8 cm to 1.2 cm, most preferably about 1 cm. Asphalt heating device according to one of the preceding claims, wherein the screw conveyor ( 20 ) has at least two threads, preferably at least 2.5 threads, more preferably has exactly 2.5 threads. Asphalt heating device according to one of the preceding claims, wherein the screw conveyor ( 20 ) has a radially extending end plate at at least one axial end. Asphalt heating device according to one of the preceding claims, wherein the screw conveyor ( 20 ) a plurality of axial passages, preferably radially adjacent to a central axis of the screw conveyor ( 20 ), having. Asphalt heating device according to one of the preceding claims, wherein the heating device ( 14 ) at least one gas burner ( 16a . 16b . 16c . 16d ) having. Asphalt heating device according to one of the preceding claims, wherein the heating device ( 14 ) at least four gas burners ( 16a . 16b . 16c . 16d ) having. Asphalt heating device according to one of the preceding claims, wherein the heating device ( 14 ) has at least one tubular heater with a plurality of gas outlets. Asphalt heating device according to one of the preceding claims, wherein the heating device ( 14 ) has at least one thermal oil heater. Asphalt heating device according to one of the preceding claims, wherein the heating device ( 14 ) has at least one microwave heater. An asphalt heater according to any one of the preceding claims, wherein the chamber ( 2 ) a housing ( 8th ), which is at least partially double-walled. An asphalt heater according to claim 17, wherein the housing ( 8th ) an inner wall bounding the chamber ( 40 ) and an outer wall at least partially surrounding the inner wall ( 44 ) having. An asphalt heater according to claim 18, wherein said heating means ( 14 ) at least partially in a space between the inner and the outer wall ( 40 . 44 ) is arranged. An asphalt heater according to claim 18, wherein the outer wall ( 44 ) at least one exhaust port ( 50 ) for discharging exhaust gases from the heater ( 14 ) having. An asphalt heater according to any one of claims 17 to 20, wherein on the housing ( 8th ) a preheat storage is provided for preheating asphalt, which is adapted to in the Preheating stored asphalt by means of exhaust gases of the heater ( 14 ) to preheat. An asphalt heater according to any one of the preceding claims, wherein at the outlet ( 6 ) a closing device for closing the outlet ( 6 ) is provided. The asphalt heater of claim 22, wherein the closing means comprises a pivotable flap. An asphalt heater according to claim 22 or 23, wherein the closing means comprises a chute for guiding heated asphalt discharged from the outlet. An asphalt heater according to any one of the preceding claims, wherein at the inlet ( 4 ) An inlet device, preferably an inlet funnel is provided. An asphalt heater according to any one of the preceding claims, wherein at the inlet ( 4 ) a closing device for closing the inlet ( 4 ) is provided. Asphalt heating device according to any one of the preceding claims, comprising a drive device ( 30 ) for rotationally driving the screw conveyor ( 20 ). An asphalt heater according to claim 27, wherein the drive means comprises a hand crank ( 30 ) for rotationally driving the screw conveyor ( 20 ) having. An asphalt heater according to claim 27 or 28, wherein between the drive means ( 30 ) and the screw conveyor ( 20 ) A transmission is provided, preferably with a translation i = 2, more preferably i = 3. An asphalt heater according to any one of the preceding claims, comprising a frame ( 52 ) with at least one wheel ( 68 . 69 ) for operating the asphalt heater ( 1 ) and at least one handle ( 76 ) for manually grasping and guiding the asphalt heater. An asphalt heater according to claim 30, wherein two handles are provided at a distance from each other, said handles being in an upright condition of said asphalt heater (10). 1 ) are arranged at a height above a floor of 40 cm to 80 cm, preferably 50 cm to 70 cm, particularly preferably about 60 cm. An asphalt heater according to any one of claims 30 to 31, wherein the frame ( 52 ) a first and a second support ( 64 ), wherein at a foot end of the first support ( 64 ) the at least one wheel ( 68 . 69 ) is attached. An asphalt heater according to claim 30 or 32, wherein the frame ( 52 ) comprises a flap device by means of which the asphalt heater ( 1 ) can be brought from a raised position into a folded position. An asphalt heater according to claim 32, wherein the first and second supports ( 66 ) pivotable on the frame ( 52 ) are hinged and the flap means for pivoting and locking the first and second support ( 66 ) in a pivoted or unverschwenkten position. An asphalt heater according to any one of claims 30 to 34, wherein said at least one wheel ( 68 . 69 ) in the folded-in position substantially centered with respect to a longitudinal extent of the asphalt heater ( 1 ) is arranged.

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