Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
  • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
  • B28C5/4203—Details; Accessories
  • B28C5/4265—Mounting means for drums; Support frames

Definitions

• the invention relates to a truck mixer according to the preamble of claim 1.
• Such mixer trucks (DE 44 31 501) have a front and rear support bracket for supporting the mixing drum on the vehicle frame, the front support bracket carrying the drive for the mixing drum and the rear support bracket being provided with two rotatably mounted rollers on which the mixing drum is located with its all-round tread.
• the rollers are supported by corresponding roller blocks with two opposite bearing plates in which the rollers are mounted.
• the roller stands are bolted to the top of the support stand by flange-side webs.
• the object of the invention is to propose a truck mixer that is safer to use, less prone to dirt and easier to clean. According to a further aspect, essentially no adjustment work for the idler bracket should be necessary, especially also in the case of a roller change.
• this object is achieved in that the rollers of the support frame are each arranged recessed within the support frame except for a projecting segment, however, a segment of each roller protruding through an opening in the support bracket for the purpose of supporting the mixing drum.
• the gap between the running ring or mixing drum and the support frame surface can be substantially minimized, so that access to this area from the outside is practically difficult.
• the support bracket it is expedient for the support bracket to be designed in the manner of a housing box, at least in the upper section, that is to say in the region of the bearing of the rollers, that is to say it is preferably formed from a front and rear support wall, two side walls and an upper cover wall.
• rollers are chambered and protected within the support frame. Furthermore, there is the northern part that the rollers mounted on bolts in the trestle walls can be produced in one clamping with the trestle, which simplifies or reduces the adjustment work for the perfect alignment of the roller tread to the tread of the mixing drum arranged obliquely on the vehicle frame.
• the entire support frame is constructed like a housing, resulting in a compact and rigid structure of the support frame.
• the trestle offers hardly any points of attack or collection points for contamination due to the accumulation of concrete and the like and is also easy to clean.
• the rollers, including the bearings are protected from contamination as a result of the chambering within the support frame, which increases the service life of the bearings and the rollers.
• the dimensions of the cover plates for the gap are also reduced.
• the result is a comparatively light-weight, but nevertheless rigid structure of the support frame, which is fastened to the vehicle frame via suitable bearing elements attached to the side.
• the support frame housing is designed with two legs. This is expediently carried out in that the lower region of the support frame is provided with a central, essentially tunnel-like recess, which is preferred forwards and downwards. is also open to the rear.
• the bearing elements for attaching the support bracket to the frame are formed at the lower end of the support bracket legs.
• the flexibility of the two-legged support bracket results in significantly lower loads on the bearing attachments of the support bracket than in the case of a support bracket with high rigidity. Since the recess is provided in the lower area, preferably approximately in the lower half of the support frame, there is an overlapping hollow body structure of the support frame above the recess, which ensures sufficient rigidity of the support frame, which is nevertheless more flexible in the lower bearing area.
• the openings in the box cover for the passage of the rollers in the axial direction of the rollers are essentially smaller than the roller diameter and perpendicular to the roller axial direction. This ensures that the rollers mounted within the support frame are in perfect condition and reduces the risk of injury to persons operating the vehicle. It goes without saying that in any case the width and the length of the opening are dimensioned in such a way that the roller can be properly gripped for the purpose of supporting the mixing drum, but the remaining gap is correspondingly small. As a result of the recessed arrangement of the rollers, there is only a small roller segment above the support frame 3 which is sufficient for the mixing drum storage. Conveniently, this is before the roll of less than 1/3 of the roller radius "over the opening.
• the recess is essentially U-shaped and largely free of edges, that is to say curved over the circumference, so that the occurrence of voltage peaks is substantially avoided.
• the rear support frame is provided with a length adjustment and a tilting device, when using a shorter mixing drum, it is possible to move the support frame forward in the direction of the driver's cabin and in particular to tilt the two front bearing elements upwards, so that the roller surface for the support of the running ring of the mixing drum can be adjusted to the running ring, so to speak.
• the front bearing elements can be designed as bearing bolts, bearing tubes, square profiles or the like.
• the support frame can be locked in the length-adjusted and tilted position, whereby according to the specification of the lengths of the mixing drum caused by the different volumes of the mixing drum, pre-adjustment points are specified for the rear support frame which is shifted or lapped in this respect.
• the front support frame is provided with a tilting device, so that refilling is also possible here in order to adapt to mixing drums of different lengths.
• the rollers are each carried by a bolt, at least one roller bearing with an inner and an outer ring and with roller bodies located between them being provided between the bolt and the roller body, the inner ring of the roller bearing being able to be cut in the installed state is arranged coaxially around the bolt. It was previously common to provide a sleeve between the inner ring and the bolt, on which the inner ring was attached. It has surprisingly been found that this sleeve can be dispensed with without disadvantage. This results in further material savings.
• the outer ring of the roller bearing is pressed into the roller body.
• the roller bearings designed as tapered rollers bodies are located in a cage between the outer and inner ring. A clearance fit is provided between the pin and the inner ring of the roller bearing, so that the pin can be removed without great effort.
• the bolts carrying the rollers can be detached in one opening each in a first plate forming the front support frame wall and in another in an opposite opening in a plate forming the rear support frame wall are held.
• the sheets used can consist, for example, of steel, aluminum, carbon fiber materials or plastics.
• the known idler roller stands can be dispensed with. This also saves material.
• the roller bearings, which are arranged coaxially around the bolts, are also arranged within the support frame in this embodiment. On the one hand, this reduces the risk of accidents and, on the other hand, it advantageously prevents dirt from entering the rolling bearings.
• the penetration of dirt into the trestle can be considerably reduced by providing lateral scraper elements that significantly reduce the gap between the rollers and the upper trestle surface.
• the fiction, contemporary mounting of the bolt is characterized by a high strength. It is advantageously provided that the openings in the interior of the support frame continue in bearing sleeves coaxial with the bolt, or that the openings are formed by the bearing sleeves. This ensures, among other things, an improved bolt insertion.
• the manufacturing accuracy is significantly increased by the construction according to the Invention. Due to the fact that the openings in the support frame after its completion can be introduced, the position of the bolts and thus the position of the bearings to the race and the rollers is exactly defined. So far, it was necessary to position the idler bracket on the support bracket exactly to ensure an exact angular position. Up to now, this required an increased deployment of personnel. Corresponding advantages also result from changing the rollers.
• the bolt at least on one side, is not passed through an opening in the sheet metal, but is only held in a bearing sleeve inside the support frame. It is particularly advantageous that the bolt is a stepped bolt and that the bolt has an external thread at its thinner end, in which a lock nut is arranged to engage. At its thicker end, the bolt has a bolt head with a ring contact surface with which it rests against the support frame at the rear. For this purpose, a recess with contact surface is advantageously provided in the bearing sleeve or directly in the rear sheet. The bolt is advantageously guided from the opening in the rear sheet metal with its thinner end first through a central opening in the roller body to the opposite opening in the front sheet metal.
• the opening in the rear panel is larger than the opening in the front panel to accommodate the thicker end of the stepped bolt.
• a locknut is now screwed onto the external thread provided on the thinner bolt end. With the help of this ' locknut, the bolt is clamped in the support frame. At the same time, the bolt with its step stop surface is laterally pulled against the roller bearing from the rear side, which advantageously preloads the roller bearing. The preload can be adjusted as required by turning the locknut. In the rear opening, the bolt is secured " against twisting, for example by a metal pin.
• the opening sizes, etc. can also be selected so that the bolt can be inserted into the support frame from the front and can be fastened in this opposite position.
• openings are provided in the support frame, preferably on the sides, for exchanging the rollers and the roller bearings.
• the openings below the rollers in the form of a roller shaft.
• the rollers must be relieved by supporting the mixing drum. Then the bolts are loosened by removing the locknuts and can be removed from the rear. The roller bodies together with the roller bearing are removed through the side openings and replaced with new roller bodies.
• the openings are closable. This is done in the simplest way by means of plates to be screwed onto the support frame onto the metal or plastic.
• a lubricating nipple for the lubrication of the rolling bearings is advantageously provided in the rear or front of each bolt.
• the support frame continues upwards on both sides in a support arm, in particular for holding the filling funnel and the outlet bowl, the upper edge profile of the sheet metal forming the rear support frame surface and / or the sheet forming the front support frame surface at least in one Section is curved in a U-shape or contoured in an N-shape.
• metal sheets that are composed of several metal sheets should of course also be included.
• the measure that the support frame continues upwards on both sides in a support arm has strength and aesthetic advantages.
• the support block construction is stiffened by the U- or V-shaped contouring of the sheet edges. The support arms go into the support frame.
• the upper trestle surface prevents dirt from entering the trestle.
• the configuration of the support frame surface according to the invention ensures that the shape of this upper support frame surface is adapted to the U- or V-shaped configuration of the support frame side surfaces.
• the openings within the upper trestle surface are necessary so that the running ring of the mixing drum can be supported by the two rollers of the trestle.
• the openings are just large enough that the rollers can be rotated without any problems.
• the sheet metal forming the rear support bracket surface and the sheet metal forming the front support bracket surface each have their upper edge with the edges of the U-shaped or V-shaped support bracket surface Sheet, preferably connected over the entire edge length, in particular welded.
• FIG. 1 shows a side view of a truck mixer with a front and rear support frame
• FIG. 2 shows a perspective view of an embodiment of a support frame with support arms
• FIG. 3 shows a perspective view of the support frame according to FIG. 2, viewed at a different angle
• FIG. 5 shows a perspective view of the support frame shown in FIGS. 2 and 3, but without a truss and without rollers
• FIG. 6 shows a perspective view of a further embodiment of a support frame in a box construction
• FIG. 7 shows a view of the structure shown in FIG. 6 shown trestle, seen from a different angle and with supporting arms connected to it
• FIG. 8 shows a perspective view of the trestle according to FIGS.
• FIG. 9 shows a perspective view of a further preferred embodiment of a two-legged trestle structure
• FIG 10 is a schematic view of a mixing drum in support g on a front and rear support frame
• FIG. 11 an analog view according to FIG. 10 of a mixing drum with a smaller nominal volume
• FIG. 12 a further alternative embodiment of a support frame with a 3-point position yield.
• Fig. 1 shows a concrete mixing vehicle 1 in the form of a truck with a frame 2, which is usually formed from two parallel longitudinal beams and a front and rear support bracket 3 and 4, on which a mixing drum designated 5 for concrete or the like and is stored.
• the drive for the mixing drum 5 is also arranged, but this is only shown schematically here.
• the mixing drum 5 is rotatably supported on the rear part of the Tron mel tread 6 on the trestle.
• the support stool 4 as can be seen from FIG. 2, has two rollers 7 which are rotatably mounted in the support stand 4.
• the upper section of the support frame 4 is formed from a box-shaped housing which is essentially formed from a front support frame wall 8 and a rear support frame wall 9 shown in FIG. 3, which are bridged at the top by a cover wall 10 , This is designed to match the diameter or the running ring 6 of the mixer drum 5 to be accommodated.
• Two trays 11 are provided on both sides in the upper region of the trestle, which, in the exemplary embodiment shown, are equally designed as a hollow box section and are connected to the box structure of the upper trestle section.
• These support arms 11 are suitably connected to the support arch by welding and / or screw connections, for which purpose the support frame is provided in the upper region in the region of its front and rear support frame wall with suitable interfaces or connection points 12.
• access covers 14 are provided, which are fastened by plugging on or by screw connections and providing access from the outside into the interior of the trestle or to those received therein Enable roles 7.
• the support arms 11 encompass the mixer drum 5 on both sides and, as can be seen from FIG. 1, the feed hopper 15 for the betoi and the feed hopper 16.
• a pouring ratchet 17 is also provided.
• the upper box-like part of the support frame 4 is supported by two oblique support struts 18 and rear spars which are connected to a support frame 19, via which the support frame is arranged on the longitudinal beams or the frame 2.
• the support frame 19 is constructed from two longitudinal spars 20 and two transverse spars 21, shown in FIG In the example of the support struts and the Hohne are formed by square profiles. This results in a comparatively stiff car on the support bracket 4.
• the rollers 7 for the support of the mixing drum are sunk inside the support frame 4 and only look out of openings 22 of the top wall 10 to the extent necessary for supporting the mixing drum for storage purposes.
• rollers 7 are mounted on bolts 23 which are designed as stepped bolts. Each bolt is received in opposite bearing openings 24 and 25 in the front and rear support wall 8 and 9. These openings 24 and 25 continue within the trestle box as bearing sleeves 26 and 27, as best shown in FIG. 5.
• the rear-side bearing sleeve 27 has at its outer end over its circumference a recess 28 with an annular support surface.
• the bolt head 29 of the stepped bolt 23 is received in this recess 28 with a lower ring contact surface (FIG. 4).
• An external thread 30 is provided on the circumference of the thinner end of each bearing pin 23.
• the bearing pin 23 is clamped between the rear trestle wall 4 and the front trestle wall 3 by means of a lock nut 31. At its thicker end, the bearing pin 23 is secured against rotation in the usual way.
• a roller bearing 33 designed as a tapered roller bearing is provided between the bearing pin 23 and the roller body 312.
• the outer ring 33 of this roller bearing 33 is pressed into the roller body 32.
• the rolling bodies 35 designed as truncated cones are arranged in a cage (not shown).
• the rolling elements 35 are supported on an inner ring 36.
• the roller bearing is designed as a two-row bearing with two imiexen and two outer rings. Contrary to the known prior art, there is no sleeve between the imier ring 36 and the peg 23.
• the inner ring 36 of the roller bearing 35 is arranged directly coaxially around the bearing pin 23. A clearance fit is provided between the bearing pin 23 and the inner ring 36, so that the pin 23 can be removed in a simple manner.
• the upper end wall 10 of the support frame is curved or curved to match the mixer drum, as are the upper edges 37 and 38 of the front support frame and the rear support frame 8 and 9. This leaves only one small gap between the mixing drum and support frame.
• the transition between the support frame 4 and the support frame 11 is stiffened, which is due in particular to the formation of the support frame and the support frame in this area as a hollow profile component. In this way, additional struts between the trays 11 or between the support arms 11 and the support frame 4 can be dispensed with. As a result, the overall structure of the support frame is slimmed down and there are practically no dirt collecting points.
• a bearing bracket 40 is provided on the rear support bracket 4 for the one-armed mounting of the pivot arm (not shown) with the chute or chute 17.
• FIG. 4 shows wiper elements 41 which reduce the gap between the rollers 7 and the edges of the two openings 22 in the end wall 10. The contamination of the bearings is considerably reduced by the wiper elements 41.
• the stripper elements 41 are designed as angle elements and screwed with their base to the upper support frame surface. Instead of such wiper elements 41, brushes or rubber wipers and the like can also be used.
• FIGS. 6 to 8 show an alternative construction of a rear support frame 4, the same reference numerals being used for the same components.
• the support frame shown here is Overall, set up box-like.
• the upper section comprising the two support arms 11 with an arcuate end wall 10 and the upper, front and rear wall sections 43 and 44 is constructed similarly to the upper section of the support frame 4 according to FIGS. 2, 3 and 5; Rollers 7 sunk in the box or housing-like support frame 4, which extend only slightly from the two openings 22 in order to be able to rotatably accommodate the mixing drum resting on the support frame 4 with a small intermediate gap.
• rollers 7 sunk in the box or housing-like support frame 4, which extend only slightly from the two openings 22 in order to be able to rotatably accommodate the mixing drum resting on the support frame 4 with a small intermediate gap.
• the support arms 11 are welded or connected to the upper support frame section via the connection point 12.
• the bearing sleeves 26 and 27 for receiving the rollers according to FIG. 3 are accommodated in two support cheeks 44 and 45, the upper edge of which is shaped analogously to the curved course of the cover wall 10.
• the support bracket 4 continues downward through a front support bracket wall 46 and a rear support bracket wall, which is not visible in the drawing, but is also closed.
• These two trestle walls are connected laterally by corresponding side walls 47 to form a housing box.
• the housing box is stiffened accordingly by inner ribs or webs.
• axle-arm-like bearing parts At the lower end of the support frame 4 there are two protruding axle-arm-like bearing parts on each side, via which the support frame structure is mounted on the frame.
• pipes or bolts which pass through the support frame structure can also be provided for this purpose. It can be axle stub-like pins, bolts, bearing flanges, bearing webs and the like.
• the bearings for the rollers can be machined mechanically in one unit with the support frame, which considerably simplifies the adjustment work.
• the bearing bolts for the rollers must be precisely aligned in order to ensure that the voluminous mixing drum is properly rotated. Due to the overall smooth outer surfaces, which is particularly important for the concrete mixing vehicles described here, the accumulation of dirt from concrete or mortar is largely avoided or cleaning is made easier.
• the bolts 48 are clamped or Vex screwed in a manner known per se by U-shaped brackets or forges with lateral approaches of the longitudinal members of the frame.
• the advantage of the overall rigid construction of the filling form according to FIGS. 6 to 8 is that it increases the roll stability of the vehicle in particular.
• the box-shaped support bracket structure according to FIG. 9 can in turn be made more flexible by forming a central recess 50 in the front and rear side walls, as a result of which the support bracket structure in the lower region is, so to speak, U-shaped with two support bracket legs 49 which the axially stub-like bolts 48 are attached.
• the roll stability is somewhat reduced compared to the embodiment according to FIGS.
• the rear lower support "bock Wall is formed with such a recess, rather it can be closed, in any case, it must be ensured that at least in the front area of the trestle structure, a quasi-two-leg design of the lower region of the box-like trestle structure is achieved through the recess. This results best from the illustration in FIG. 9. With this embodiment, an overloading of the bearings of the support frame structure on the longitudinal members is avoided even with high torsional stresses.
• FIG. 10 shows a mixing drum 5 with a nominal volume of, for example, 10 m 3
• FIG. 11 shows a mixing drum 5 with a nominal volume of 6 m 3
• the front part 51 and the rear part 52 of the mixing drum are unchanged in both embodiments of the mixing drum 5, but the central cylindrical section 53 is designed for different lengths.
• largely the same components of the mixing drum can be used for different nominal volumes.
• the rear support bracket 4 is provided with an adjustment device which displaces the rear support bracket longitudinally in the axial direction of the side members and swivels the rear trestle allows.
• the front support bracket 3, on the other hand, is provided with a ner adjusting device which enables the front support bracket to be pivoted.
• FIGS. 10 shows an arrangement of a mixing drum on a concrete vehicle, in which the adjusting device of the rear support bracket 4 is in ⁇ eutralstel mg, ie the support bracket 4 is in a non-pivoted position in which the axes of the bearing bolts 48 span a plane. which is essentially parallel to the longitudinal beams.
• An average drum size for example a drum with an internal volume of 9 m 3 , is expediently used for the neutral position, so that the tilt angles do not become too large.
• the support frames must then be tilted backwards. In the case of shorter drums, the trestles must then be popped forward.
• the pivoting takes place in the region of the front bearing pin 48.
• the pivoted-up position of the support bracket is then locked in a suitable manner, which can be done, for example, by welding a holder or by having tabs on the side of the side members or cross plates are attached, which have a guide curve for a support pin provided on the support bracket, in order to enable the pivoting movement.
• the locking is then carried out by appropriate locking pins, the pivoting movement of the mixing drum taking place in adaptation to the different nominal volumes in predetermined steps.
• the front support bracket 3 is pivoted upwards by an angle a by its front bearing bolts, so that the support bracket bearings are refilled to the different nominal volumes of the mixer drums.
• FIG. 12 The embodiment of a support frame according to FIG. 12 is similar in construction to the embodiment according to FIGS. 6 to 8 in that the support frame structure is box-shaped. However, this trestle structure is designed for 3-point mounting on the frame or the longitudinal beams. 12, which are denoted by 48, are designed in accordance with the embodiment according to FIGS. 6 to 8, the bearings 48 being formed by a tube passing through the support frame structure. However, the mounting of the trestle structure in the front area differs due to the design as a 3-point mounting.
• the front section of the support frame structure or the front part is formed by a tapered hood 60 with a pyramid-shaped or funnel-shaped structure, a bearing pin 61 being located at the front end, which is shown as a stub axle.
• this support point is designed as a ball joint or as an elastic bearing.
• the trestle assembly is displaced with the two lateral bearings 48 relative to the longitudinal members, whereas the trestle assembly in the front area can be displaced on a cross member or the like spanning the longitudinal members. As can be seen from FIG.
• the bearing point 61 is centered with respect to the support bracket structure or the two Bearing points 48 arranged, otherwise reference is made to the previous description with regard to the further configuration of the support frame, in particular as regards the upper structure of the support frame including the recessed mounting of the support rollers and the lateral support arms of the support structure.
• the advantage of the 3-point mounting realized with the embodiment according to FIG. 12 is that when torsional stress is applied to the two longitudinal beams of the vehicle frame, one plane is always spanned, thereby largely avoiding forced deformations of the trestle structure and corresponding overloading of the bearing points.
• the support frame In the case of a 4-point bearing, the support frame is held on four bearing points in one level on the vehicle frame. If torsional forces occur on the two longitudinal beams, the resulting bends result in at least one of the bearing points moving out of the spanned plane, so that forces act on the support frame and the bearing points. This must be countered by appropriate design of the bearing areas. In the case of the 3-point bearing described, such forced deformations on the support frame are largely avoided, so that they cannot build up correspondingly high forces at the bearing points.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Structural Engineering (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
• Road Paving Machines (AREA)

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• 2004
  • 2004-01-22 DE DE102004003373A patent/DE102004003373A1/de not_active Withdrawn
• 2005
  • 2005-01-20 AT AT05701080T patent/ATE493250T1/de active
  • 2005-01-20 DE DE502005010752T patent/DE502005010752D1/de not_active Expired - Lifetime
  • 2005-01-20 CN CN200580009054A patent/CN100589950C/zh not_active Expired - Lifetime
  • 2005-01-20 WO PCT/EP2005/000539 patent/WO2005070637A2/fr not_active Ceased
  • 2005-01-20 EP EP05701080A patent/EP1706250B1/fr not_active Expired - Lifetime

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