DE102020003624A1 - Conveyor device for conveying components - Google Patents

Abstract

The invention relates to a conveying device for conveying components, in particular in the body shop of the motor vehicle industry. In the area of a loading station, a mass balancing device for the lifting truck of a lifting device is provided, by means of which the drive device for driving the lifting truck can be limited to a minimum. A tensile force limiting device for a flexible traction means ensures that workers working in the area of the loading station are not injured.

Description

genus

The invention relates to a conveying device for conveying components.

State of the art

Conveying devices are already known in a vast number of constructions for the different areas of application. In the body shop of the motor vehicle industry, such conveying devices are used for conveying components in a variety of ways. Most conveying devices have motorized, usually electric, drives and, for conveying components, either have conveyor belts made of elastic material or rollers which are arranged with low friction in roller bearings in order to convey components, for example pallet trucks with components, thereon.

From the DE 20 2007 016 549 U1 a conveying device for components is previously known, the component receptacles having a component guide for positioning and guiding one or more components. The conveyor tracks are designed as separately arranged feed and return tracks for the component holders, the feed and return tracks having oppositely directed inclinations and the component holders being transported by gravity. A conveyor track can have a storage area at the conveyor end. The feed devices are arranged on racks.

From the DE 20 2013 101 531 U1 a pneumatic lifting device for lifting a component carrier on a feed device is previously known, the lifting device having a lifting element for driving a component holder and wherein the lifting force of the lifting element is limited and a movement of the component carrier holder between an insertion position and a feeding position takes place with the application of an additional manual force.

the WO 2014/001333 A3 shows a feed device and a feed method for components, the feed device having a mobile component carrier and a downwardly inclined guide track as well as rolling bodies on the guide track and / or on the one or more component carriers for the rolling component carrier transport. The feed device also has a braking device which is assigned to a rolling body and brakes it.

Also from the WO 2014/006014 A1 a feed device for components is previously known, which has mutually inclined guide tracks.

A similar feed device shows EP 3 170 772 A1 with oppositely inclined conveyor tracks on which pallet trolleys can be conveyed by gravitational force. Also the EP 2 653 410 A1 relates to such a feed device with mutually inclined conveyor tracks on which component receptacles can be conveyed by gravitational force.

Such a feeder concerns the WO 2009/068241 A1 .

the DE 20 2012 102 447 U1 describes a feed device for components, the feed device having a downwardly inclined guide track, a mobile component carrier releasably connected to the guide track and interacting sliding and guide means, in particular rolling bodies and rails, on the guide track and on the component carrier, the feed device having a loading point, on which a component carrier is connected to the guideway by a worker and, if necessary, loaded with one or more components. At the loading point, the feed device has a transfer device that can be operated manually and operated with manual force against a return element for the positioned transfer of a component carrier to the guideway.

From the DE 20 2017 102 428 U1 a transfer device for a feed device with differently inclined guide tracks and a mobile component carrier for a component that can be connected to the guide tracks is known, the transfer device having a manually operated lifting device with an upright lifting axis and a track section that can be connected flush to the guide tracks. The lifting device has a base with a height-adjustable, frame-like lifting beam with a pivoting device, the lifting beam being oriented transversely or obliquely to the lifting axis and the track section being pivotably mounted on the lifting beam by means of the pivoting device. The conveyor tracks are also inclined relative to one another.

the DE 20 2012 102 405 U1 describes a feed device with mutually inclined conveyor tracks for components, the feed device having a mobile, brakable building support and a downwardly inclined guide track and roller bodies. The feed device has a braking device which is assigned to a roller body and brakes it.

From the DE 10 2006 018 718 A1 a charging device for highly automated production lines is previously known, in particular in the automotive industry, in which a conveyor device removes parts, in particular semi-finished parts, from a storage unit via a conveyor line to one arranged processing unit supplies the production line. The conveying path comprises an elongated guide element, the parts being threaded onto said guide element and the parts being provided with at least one bore for this purpose.

task

The invention is based on the object of creating a conveyor device for conveying pallet trolleys with components, in particular for use in body construction in the automotive industry, in which the risk of injury to a worker when loading pallet trolleys is minimized and the drive power of a lifting device for lifting pallet trolleys is minimized is reduced between superposed guideways.

solution

This object is achieved according to the invention by a conveyor device for conveying components, especially in the body shop of the automotive industry, with two conveyor tracks arranged in a vertical plane one above the other and at a distance from one another and linearly inclined at opposite angles to one another, on which pallet trucks can be conveyed mainly by gravitational force an upper conveyor track, which has a loading station in which the pallet trolleys are loaded with components to be conveyed, the conveyor track arranged under the upper conveyor track taking over the unloading pallet trolleys from a lifting device that can be unloaded manually or by a robot and these empty pallet trolleys also predominantly by gravitational force the loading station can be fed back, with the empty pallet trolleys at the loading station by a motor-driven lift device, for example by means of a flexible traction device - rope or chain - between the conveyor bay nen of the conveyor tracks can be lifted, whereby the tensile force of the flexible traction means can be limited to a security amount by an optionally adjustable tensile force limiting device and the weight of the pallet trolley and the proportionate liftable weight of the lifting device and preferably the components to be arranged on the pallet trolley are completely or almost completely due to a gravimetric mass balancing device is balanced.

Some advantages

In the conveyor device according to the invention, only a small drive force is required for the lifting device for the lifting device for the pallet trolleys between the stacked conveyor tracks, since the weight of the lifting trolley of the lifting device and the empty pallet trolleys to be picked up by the lower conveyor track are practically balanced by the gravimetric mass balancing device will. Therefore, only an extremely low drive force is required for the manual or motorized drive of the lifting device. The tensile force of the flexible traction means (rope or chain) can be adjusted to such a force that a worker in the area of the charging station cannot be injured. For example, the tensile force can be set to a remaining weight of 5 kilograms, which can be overcome with the manual force of the person working in the area of the loading station without great effort. The tensile force limiting device, which is designed as a friction clutch, then simply slips through so that no injury can occur.

Further inventive developments

Further inventive refinements are described in claims 2 to 12.

In claim 2, a conveyor device is described in which the lifting device is assigned a lifting truck which is connected to, for example, a flexible traction device, at the end portion of which weights are freely suspended on one or both sides of the lifting truck, which form the gravimetric mass balancing device. Such a construction ensures with simple means that the weight of the lift truck of the lifting device can be practically compensated so that the worker working at the loading station cannot be injured in conjunction with the tensile force limiting device. The gravimetric mass balancing device forming the weights can be produced with simple, maintenance-free means.

Claim 3 describes a conveying device in which the flexible traction means can be driven in a motor-driven stroke by an activator working in opposite directions. This motor drive is formed according to claim 4 by a pneumatic activator to be acted upon on both sides. Since compressed air is available everywhere, especially in the body shop of the motor vehicle industry, such pneumatic activators are particularly cost-effective to use.

If necessary, however - as described in claim 5 - the motor drive for the flexible traction means can be an electric motor which can be reversed in a suitable manner in order to control the lifting carriage of the lifting device in opposite lifting directions.

It is particularly advantageous if, according to patent claim 6, the motor drive for the flexible traction means is a pneumatic one without a piston rod Activator is. Such an activator takes up a relatively small space and can be allocated to the loading station in the longitudinal axis direction at low cost.

The conveyor device in claim 7 is characterized in that the tensile force limiting device is arranged on the side of the flexible traction device opposite the activator and that the tensile force limiting device has one or more gears that mesh with the flexible traction device designed as a link chain, with friction clutches that can be set with the gears being non-positive cooperate, which limit the tensile force transmitted by the flexible traction means to the lifting truck to a predetermined value. The tensile force limiting device can be produced with simple, robust components and, if necessary, continuously adjusted to the desired tensile force of the flexible traction means - rope or chain.

In claim 8, a conveying device is described in which the friction clutch has brake shoes loaded by compression springs, which act in a force-locking manner on opposite side surfaces of the associated gear.

A further advantageous embodiment describes claim 9, which is characterized in that the adjustable pulling force, which can be transmitted to the lifting carriage of the lifting device by the flexible traction means, is applied to a low lifting mass of 1 to 15 kilograms, preferably 2 to 8 kilograms, in particular 3 to 5 Kilograms, is limited.

The conveying device evident from patent claim 10 is characterized in that the lifting device has two or more spaced apart and parallel to each other vertical tubes, between which on one side of the loading station the rodless activator, designed as a pneumatic cylinder, is arranged and vertical tubes are assigned rollers via which the traction device in question is arranged, at the end of which the mass balancing device is arranged in the form of exchangeable weights. Such a conveying device can be easily assembled and dismantled at suitable locations in the halls of the motor vehicle industry.

According to patent claim 11, the conveyor device is characterized in that the pallet trolleys have rollers on their underside with which they roll smoothly on the rails of the conveyor tracks. The pallet trolleys with the components can be easily moved by gravitational force.

Claim 12 describes a further advantageous embodiment, which is characterized in that the conveyor tracks are arranged on the floor by frames which are formed from tubes with a polygonal cross section.

• 1 Eine Fördervorrichtung in schematischer Seitenansicht beim Beladen einer Palette durch einen Werker;
• 2 den Entladebereich des aus 1 ersichtlichen Förderers, wobei sich die Palette mit der Last noch in Entladestellung befindet;
• 3 den aus 2 ersichtlichen Endbereich des aus 1 ersichtlichen Förderers, wobei die entladende Palette auf die untere Förderebene der aus 1 ersichtlichen Fördervorrichtung abgesenkt wurde;
• 4 die aus 1 ersichtliche Fördervorrichtung beim Rücktransport von Palettenwagen zur Beladestation;
• 5 eine Einzelheit aus der Beladestation, im größeren Maßstab, mit Massenausgleichsvorrichtung und kolbenstangenlosem Aktivator;
• 6 die aus 5 ersichtliche Einzelheit in konstruktiver Darstellung, im größeren Maßstab;
• 7 eine Einzelheit aus der Beladestation;
• 8 eine Zugkraftbegrenzungsvorrichtung der Beladestation, abgebrochen dargestellt, in perspektivischer Darstellung;
• 9 eine Einzelheit aus 8, teils im Schnitt;
• 10 einen Palettenwagen in Unteransicht, in perspektivischer Darstellung;
• 11 eine Stoppeinrichtung oder Bremsvorrichtung, in perspektivischer Darstellung, und
• 12 die aus 11 ersichtliche Stoppeinrichtung oder Bremsvorrichtung in Anordnung an Führungsschienen der Fördervorrichtung, ebenfalls perspektivisch und abgebrochen dargestellt.

In the drawing, the invention is illustrated - partly schematically - using an exemplary embodiment. Show it:

• 1 A conveyor device in a schematic side view when loading a pallet by a worker;
• 2 the unloading area of the 1 visible conveyor, the pallet with the load is still in the unloading position;
• 3 the off 2 apparent end of the from 1 visible conveyor, with the unloading pallet on the lower conveyor level of the 1 apparent conveyor has been lowered;
• 4th from 1 Obvious conveyor device when transporting pallet trolleys back to the loading station;
• 5 a detail from the loading station, on a larger scale, with mass balancer and rodless activator;
• 6th from 5 visible detail in constructive representation, on a larger scale;
• 7th a detail from the loading station;
• 8th a tensile force limiting device of the loading station, shown broken off, in a perspective view;
• 9 a detail 8th , partly in cut;
• 10 a pallet trolley in a bottom view, in a perspective view;
• 11 a stopping device or braking device, in a perspective view, and
• 12th from 11 visible stop device or braking device arranged on guide rails of the conveyor device, also shown in perspective and broken away.

In 1 loads a worker 1 one on its underside with rollers 1a provided pallet trolleys 2 with a component not shown in detail as a piece goods, which in the direction X is to be transported.

The loaded pallet trolley 2 is applied to the at an acute angle α inclined conveyor track 3 by the worker 1 triggered and then moves with its rollers mounted in roller bearings 1a in the direction X . The conveyor track 3 can also be used with smooth-running transport rollers or - be provided rollers, which are stored in roller bearings and the pallet trolley 2 from the loading station 4th to the unloading station 5 move. In this case the roles are omitted 1a . If necessary, one or more of the rollers or cylinders arranged in parallel and at a distance from one another can also be motor-driven. The movement of the pallet truck 2 is going towards X by the gravitational force corresponding to the angle of inclination by the downhill force G - sin α supported, where α and β the respective angle of inclination of the conveyor tracks 3 , 17th and G the total weight of the pallet truck 2 is equivalent to.

The loaded pallet trolleys 2 move to the unloading station 5 and can accumulate one after the other and thus require a kind of buffer for those arriving one after the other, each direction X moving further pallet trolleys 2 ( 1 and 2 ).

At the end of the conveyor track 3 a stop device can be provided, which will be discussed further below. Over the length of the conveyor track 3 can have several of these 11 apparent stopping devices 6th be provided. The pallet trolleys 2 have a kind of fin on their underside 7th . The stop device 6th has a pair of opposing brake shoes 8th , 9 on through which the Finn 7th of a pallet truck 2 can slide through. The brake shoes 8th , 9 are in the closed position by springs, therefore against the outer surfaces 10 the Finnish man 7th , burdened. The brake shoes 8th , 9 can through a wedge 11 be moved in the open position. The wedge 11 is controlled by a pneumatic cylinder 12th between the brake shoes 9 pushed. If a pallet truck 2 is braked, the fin will 7th through the brake shoes 8th , 9 frictionally with the associated pallet trolley 2 held. Become the brake shoes 8th , 9 through the wedge 11 moved to the open position, the pallet trolley 2 released and can move towards X on the conveyor track 3 move on.

As already mentioned, such stopping and braking devices as they are from 11 can be seen at different points on the conveyor track 3 can be provided and can also serve as a speed reducer to prevent heavy collisions between pallet trolleys 2 to prevent and also enable gentle transport and also prevent goods to be transported from falling off the pallet trolleys 2 .

At the end of the conveyor track 3 is the unloading station 5 arranged a lifting device 13th has, which essentially consists of a piston rod 14th and a cylinder to which a hydraulic fluid is applied alternately on both sides 15th consists of the one with the piston rod 14th connected plate shape 16 has on which the pallet trolley 2 at the end of the conveyor track 3 runs up and thereby the corresponding vertical stroke movement of the piston rod 14th in the direction T down to the level of the lower conveyor track 17th can be lowered and then towards V can be deported on this. The conveyor track 17th can in principle like the conveyor track 3 be equipped.

As from the 1 and 4th can be seen is the conveyor track 3 at an acute angle α in the direction X linearly inclined while the conveyor track 17th around the acute angle β straight towards V , so in the direction of the loading station 4th , is inclined. The acute angles α and β can be the same, but also different.

The so-called downhill force supports the movement of the pallet trolleys 2 both towards X as well as towards V , since the downhill force is formed by the product of the weight of the respective pallet truck 2 and the sine of the angle of inclination α or β . This means that, if necessary, a special motorized drive can be used for the pallet trolleys 2 both for driving towards X as well as for driving in the direction V be waived.

In any case, the result is a uniform, jolt-free movement of the pallet trolleys 2 both towards X as well as towards V according to the angles of inclination α or β .

Also on the lower conveyor track 17th can as on the upper conveyor 3 one behind the other pallet trolleys 2 be stacked. As in the upper conveyor 3 can in the lower conveyor track 17th also stop devices 6th or braking devices as used in connection with the upper conveyor track 3 have been described.

Which are on the lower conveyor track 17th in the direction V moving pallet truck 2 arrive at the loading station 4th where they are lifted by a lifting device that can also be moved vertically up and down 18th up to the height loading area for the worker 1 by a rodless pneumatic cylinder 19th can be raised or lowered. A chain hoist is used for this 20th , which in the present case consists of a link chain and toothed wheels 21 and 22nd consists on a frame-like frame 23 are arranged. The frame-like frame 23 are spaced, parallel and at a distance from one another, extending in the direction of stroke AWAY associated with extending, in a cross-section extending transversely to their longitudinal axis, polygonal tubes which are provided with numerous through holes. The through holes can also be omitted.

Between the vertical pipes 24 , 25th is a pallet truck 26th arranged by the chain hoist 20th in the direction A. and B by opposing pressurization of the pneumatic cylinder 19th is movable.

The empty pallet trolleys 2 are in turn in the loading area for the worker 1 moved so that it can load the respective pallets with goods.

The chain hoist 20th and with it the pallet truck 26th is a mass balancing device on both sides 27 assigned, which consists of weights that each have a flexible traction device 28 with the pallet truck 26th and thus indirectly also with the chain hoist 20th connected is. The respective flexible traction device 28 is each about roles 29 and 39 guided and with the pallet truck 26th connected. The pallet truck 26th is on opposite guides 31 in the vertical direction A. or. B. forcibly guided. The mass balancing device 27 balances the weight of the pallet truck 26th and possibly also part of the weight of the chain hoist 20th and the load on the pallet truck 26th , so pallet trolleys 2 , and if necessary loading, completely or almost completely, so that for the drive of the loaded pallet truck 26th in the direction A. only low drive force from the pneumatic cylinder 19th is required. In addition, the worker 1 largely against unintentional movement of the pallet truck when loading 26th protected, as this is practically completely or almost completely for the worker after loading 1 is weightless. In contrast to the embodiment shown, it may be sufficient to have a mass balancing device on only one side 27 to provide, as is usually sufficient, only one pneumatic cylinder without a piston rod 19th for driving the pallet truck 26th and the pallet trolley to be placed on it 2 to be provided with loading.

The pallet truck 26th is a tensile force limiting device 32 assigned to that with the chain hoist 20th cooperates. As a result, the tensile force can be limited, namely to one for the worker 1 harmless value, for example to 5 kilograms, so that no injuries can occur.

The conveyor tracks 3 and 17th are on racks 33 , 34 arranged, which in the illustrated embodiment consist of cross-sectionally polygonal, in the present case octagonal tubes, which each consist of opposing, preferably in pairs, coaxially arranged through bores which extend over the longitudinal axis of the respective frames 33 , 34 are evenly spaced from one another. As a result, any device parts can be intermittently attached to the conveyor tracks by screws or the like 3 and 17th to be ordered. Several tubes can be arranged, which form a frame-like frame, around the conveyor tracks 3 and 17th at height distance to the ground 35 to store.

The traction limiting devices 32 assign one car each 36 on the pair of gears 37 are arranged, each of which has adjustable friction brakes 39 assigned. Each of the brakes has two on opposite side surfaces of the associated gears 37 pressable brake shoes 40 , 41 on that in opposite brake cylinders 42 , 43 Are longitudinally displaceable and stored. Each of the brake shoes 40 , 41 is made by a pretensioned compression spring 44 pressed against the respective side surface, with in 9 only the two side surfaces 45 , 46 have been provided with reference numerals. The preload of the compression springs 44 can be adjustable, so that the frictional force with which the brake shoes 40 , 41 in the direction P. against the side surfaces 45 , 46 be pressed, can be adjusted.

The features described in the patent claims and in the description and evident from the drawing can be essential for realizing the invention both individually and in any combination.

List of reference symbols

1

Worker

1a

roll

2

Pallet trolley

3

Conveyor track

4th

Loading station

5

Unloading station

6th

Stop device

7th

fin

8th

Brake shoe

9

"

10

Outer surfaces of the fin 7th

11th

wedge

12th

Pneumatic cylinder

13th

Lifting device

14th

Piston rod

15th

cylinder

16

Pallet shape

17th

Conveyor track

18th

Lifting device

19th

Pneumatic cylinder, rodless

20th

Chain hoist

21

Plate chain

22nd

Gears

23

Frame, frame-like

24

Pipe, vertical

25th

"."

26th

Pallet truck

27

Mass balancing device

28

Traction means, flexible

29

roll

30th

"

31

guides

32

Traction limiting device

33

frame

34

"

35

floor

36

car

37

Gears

38

-

39

Friction brake

40

Brake shoes

41

"

42

Brake cylinder

43

"

44

Compression spring

45

Side face

46

"

X

Direction of conveyance of the loaded pallet trolleys 2

Y

Direction of movement of the empty pallet trolleys 2 on the lower conveyor track 17th towards the loading station 4th

T

Stroke movement of the piston rod 14th downward

V

Movement of the pallet truck 2 onto the lower conveyor track 17th

A.

Stroke direction, vertical ","

P.

Direction of braking forces

G

Total weight of the pallet trolley 2

α

Inclination angle of the upper conveyor track 2

β

"" Lower conveyor track 17th

bibliography

• DE 10 2006 018 718 A1
• DE 20 2007 016 549 U1
• DE 20 2012 102 405 U1
• DE 20 2012 102 447 U1
• DE 20 2013 101 531 U1
• DE 20 2017 102 428 U1
• WO 2009/068241 A1
• WO 2014/001333 A3
• WO 2014/006014 A1
• EP 2 653 410 A1
• EP 3 170 772 A1

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 202007016549 U1 [0003, 0045]
• DE 202013101531 U1 [0004, 0045]
• WO 2014/001333 A3 [0005, 0045]
• WO 2014/006014 A1 [0006, 0045]
• EP 3170772 A1 [0007, 0045]
• EP 2653410 A1 [0007, 0045]
• WO 2009/068241 A1 [0008, 0045]
• DE 202012102447 U1 [0009, 0045]
• DE 202017102428 U1 [0010, 0045]
• DE 202012102405 U1 [0011, 0045]
• DE 102006018718 A1 [0012, 0045]

Claims (12)

Conveyor device for conveying components, in particular in the body shop of the motor vehicle industry, with two conveyor tracks (3, 17) which are arranged in a vertical plane one above the other and at a distance from one another and which are inclined in a straight line at opposite angles (α, β) and on which pallet trolleys (2) are conveyed primarily by gravitational force, with an upper conveyor track (3) which has a loading station (4) in which the pallet trolleys (2) are loaded with components to be conveyed, the conveyor track (17) arranged under the upper conveyor track (3) takes over the unloading pallet trolleys (2) from a lifting device (13) that can be unloaded manually or by a robot and these empty pallet trolleys (2) can also be returned to the loading station (4) mainly by gravitational force, with the empty pallet trolleys (4) at the loading station (4). 2) by a motor, for example by means of a flexible traction means - rope or chain - drivable lift device (18) between chen the conveying levels of the conveyor tracks (3, 17) can be lifted, whereby the tensile force of the flexible traction means (28) can be limited to a safety amount by an optionally adjustable tensile force limiting device and the weight of the pallet trolley (2) and the proportionate liftable weight of the lifting device (18) and preferably the components to be arranged on the pallet trolley (2) are completely or almost completely balanced by a gravimetric mass balancing device (27). Conveyor according to Claim 1 , characterized in that the lifting device (18) is assigned a lifting truck (26) which is connected to, for example, a flexible traction device (28), at the end portion of which weights are arranged freely hanging on one or both sides of the lifting truck (26) forming the gravimetric mass balancing device (27). Conveyor according to Claim 1 or 2 , characterized in that the flexible traction means (28) can be driven by an activator working in opposite directions so that it can be lifted by a motor. Conveyor according to Claim 1 or one of the preceding claims, characterized in that the motor drive for the flexible traction means (28) is a pneumatic activator to be acted upon alternately on both sides. Conveyor according to Claim 1 or one of the Claims 2 or 3 , characterized in that the motor drive for the flexible traction means (28) is an electric motor. Conveyor according to Claim 1 or one of the Claims 2 until 4th , characterized in that the motor drive for the flexible traction means (28) is a pneumatic activator without a piston rod. Conveyor according to Claim 1 or one of the preceding claims, characterized in that the tensile force limiting device is arranged on the side of the flexible tensile means (28) opposite the activator and that the tensile force limiting device has one or more gears which mesh with the flexible tensile means (28) designed as a link chain, wherein Friction clutches which can be adjusted with the gears and which limit the tensile force transmitted to the lifting truck (26) by the flexible traction means (28) to a predetermined value cooperate in a non-positive manner. Conveyor according to Claim 7 , characterized in that the friction clutch has brake shoes which are loaded by compression springs and which act in a force-locking manner on opposite side surfaces of the associated gear. Conveyor according to Claim 1 or one of the preceding claims, characterized in that the adjustable tensile force which can be transmitted to the lifting truck (26) of the lifting device (18) by the flexible traction means (28) is applied to a low lifting mass of 1 to 15 kilograms, preferably of 2 to 8 kilograms, in particular from 3 to 5 kilograms. Conveyor according to Claim 1 or one of the preceding claims, characterized in that the lifting device (18) has two or more spaced apart and parallel to each other vertical tubes (24, 25), between which on one side of the loading station (4) the piston rodless as a pneumatic cylinder (1) formed activator is arranged and vertical tubes (24, 25) are assigned rollers (29, 30) over which the relevant traction means (28) is arranged, at the end of which the mass balancing device (27) is arranged in the form of exchangeable weights. Conveyor according to Claim 1 or one of the preceding claims, characterized in that the pallet trolleys (2) have rollers (1a) on their underside with which they roll smoothly on the rails of the conveyor tracks (3, 17). Conveyor according to Claim 1 or one of the preceding claims, characterized in that the conveyor tracks (3, 17) are arranged on the floor by frames (33, 34) which are formed from tubes with a polygonal cross section.

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