EP3969404A1

EP3969404A1 - Industrial truck

Info

Publication number: EP3969404A1
Application number: EP20712262.3A
Authority: EP
Inventors: Jürgen KELLER
Original assignee: Hubtex Maschinenbau GmbH and Co KG
Current assignee: Hubtex Maschinenbau GmbH and Co KG
Priority date: 2019-05-14
Filing date: 2020-03-12
Publication date: 2022-03-23
Also published as: WO2020229018A1; DE102019112577A1; US20220204325A1

Abstract

In an industrial truck (100) comprising opposing lifting masts (9, 10) and a loading platform (11) located between same, each of the lifting masts (9, 10) comprises at least two guide profiles (25, 26), each guide profile (25, 26) has an inner cross-section with a lateral surface (29), which extends in the lifting and lowering direction (Z) and perpendicular to the forward and backward direction of travel (V-R), and the loading platform (11) has at least one guide element for each guide profile (25, 26), in particular a guide roller (31, 32), which slides, in particular rolls, on the lateral surface (29) of the respective guide profile (25, 26).

Description

Industrial truck

The invention relates to an industrial truck with oppositely arranged lifting masts for lifting, lowering and guiding a loading platform located between these in a lifting and lowering direction. The invention relates in particular to an industrial truck which is used to transport air freight shipment pallets or containers.

Such an industrial truck is known under the designation "Xway Mover 7000" from DIMOS Maschinenbau GmbH. This industrial truck is provided with four lifting masts for raising, lowering and guiding. To absorb forces that occur when the pallets or containers are pushed onto the La When the platform acts on the lifting masts, each lifting mast is equipped with a specially designed profile. To raise and lower the loading platform, each of the four lifting masts is equipped with a hydraulic cylinder. The hydraulic cylinders are supplied with hydraulic fluid separately from one another.

The disadvantage of this industrial truck is that it is expensive to manufacture.

The invention is therefore based on the object of creating an industrial truck, in particular for the transport of air freight shipment pallets or containers, the production expense of which is reduced in comparison. This object is achieved by the truck reproduced in claim 1.

In the industrial truck according to the invention, each of the lifting masts comprises at least two guide profiles, each guide profile having an inner cross section with a side surface that extends in the lifting and lowering direction and perpendicular to the direction in which loads such as air freight pallets or containers on the loading platform be pushed up or down. This direction regularly corresponds to the forward and reverse direction of the industrial truck. The loading platform comprises at least one guide roller for each guide profile, which rolls on the side surface of the respective guide profile. Due to this design of the masts when pushing a pallet or container on the loading platform acting force, which is directed transversely to the weight force and is thus also referred to as "transverse force" be, introduced directly into the masts without this being a be Since each of the lifting masts comprises at least two guide profiles, the industrial truck according to the invention is not only suitable for absorbing the transverse force acting on the loading platform when a pallet or container is pushed on, but also for absorbing an opposing transverse force that occurs when pulling down the pallet or the Contai ners or acts on the loading platform when a pallet or a container is pushed in the opposite direction, that is, for example, acts on the loading platform from behind.

Furthermore, the provision of two guide profiles per lifting mast means that only two lifting masts are required to raise, lower and guide the loading platform, which further reduces the manufacturing effort associated with the Flurför derzeug according to the invention.

Particularly preferred is a development of the floor conveyor according to the invention, in which the inner cross-sections of the guide profiles are C-shaped, each with a base surface and two parallel side surfaces extending perpendicularly from the base surface to an open profile side, and the guide profiles in such a way the respective mast are that the open profile sides of the guide profiles of different lifting masts face each other. On the one hand, due to this design of the guide profiles, commercially available profiles can be used. On the other hand, the facing arrangement of the open profile sides of the guide profiles of different lifting masts has the effect that the loading platform is guided by the guide profiles not only in the direction described above, but also in a transverse direction perpendicular thereto - that is, towards one of the lifting masts the guide elements, in particular the guide rollers, slide on the base surfaces of the guide profiles.

An embodiment of the industrial truck according to the invention is particularly preferred, which comprises exactly two lifting masts.

Furthermore, it is particularly preferred if precisely one guide element, in particular precisely one guide roller, is provided for each guide profile.

If - as is also preferred - several, vorzugswei se exactly two in the raising and lowering direction spaced guide elements, preferably guide rollers are provided for each guide profile, although the manufacturing cost of the truck according to the invention increases slightly. Due to the multiple guide elements, in particular guide rollers per guide profile, it is prevented, however, that the loading platform can tilt about an axis which runs parallel to its surface and perpendicular to the transverse direction.

In order to be able to raise or lower the loading platform with a motor, each lifting mast preferably comprises two disks which are spaced apart in the lifting and lowering direction and which are rotated by a flexible traction device, at least one of the disks being rotatable by means of a drive device. The flexible traction means can, for example, be one or more V-belts running parallel to one another. The pulleys are then designed as single or double belt pulleys. Compared to a lifting mast, in which a hydraulic cylinder is provided for raising and lowering the loading platform, a lifting mast designed in this way is characterized by a lower manufacturing cost. This flexible traction means is preferably arranged such that it comprises two strands extending in the raising and lowering directions. To raise and lower the loading platform must then be verbun with one of these two strands and one of the two disks be driven in the corresponding direction of rotation with the aid of the drive device. It is particularly preferred to connect the loading platform with two parallel strands of the flexible traction means of the two lifting masts, since then the mechanical load on the flexible traction means is reduced.

The drive device, by means of which a disk can be driven in rotation, preferably comprises an electric motor. By means of a suitable electronic control, the drive device can then be subjected to power very sensitively and, with a load, for example the pallet or container, can be raised or lowered particularly sensitively.

Furthermore, an embodiment of the industrial truck according to the invention is particularly preferred in which it comprises steering motors and travel drives which are also designed to be electrically operated. This development of the industrial truck according to the invention is again characterized by a particularly low manufacturing cost, since the operation of the vehicle with only a single energy source - an electrical power storage - is possible.

The invention will be explained further with reference to the accompanying drawings. They show schematically:

1 shows an embodiment of an industrial truck according to the invention in a first perspective view;

Fig. 2 the same embodiment in a second perspective view;

3 shows the same exemplary embodiment in a side view;

4 shows the same embodiment in a view corresponding to FIG. 2, but loaded with a transport container; 5 shows the same exemplary embodiment in a view from below;

6 shows the same exemplary embodiment in a view from above;

7 is a partial view of the same embodiment in a view according to FIG. 1 from behind;

Fig. 8 is a perspective rear view of a first embodiment of one of the two masts of the floor conveyor according to the invention;

Fig. 9 is a perspective front view of the lifting mast shown in Fig. 8;

Fig. 10 is a front view of the front of the same lifting mast;

11 is a view of the same lifting mast from above;

12 shows a detailed view of a drive device of this lifting mast;

13 shows a machine element which is driven in rotation by means of the drive device and interacts with a flexible traction means;

14 is a perspective rear view of a second exemplary embodiment of a lifting mast;

15 is a plan view of the front of the same lifting mast;

16 is a perspective front view of the same lifting mast;

17 shows a perspective detail view of the upper area of a lifting mast and 18 shows a detail view of the central area of the exemplary embodiment of the lifting mast shown in FIGS. 14 to 16.

The exemplary embodiment of an industrial truck according to the invention (hereinafter "industrial truck 100") shown in the drawing comprises a chassis 1 with a loading area 2 which is delimited by side areas 3, 4. In the two side areas 3 and 4, components that cannot be seen in the drawing that are required for the operation of the industrial truck, for example energy storage devices such as fuel tanks and accumulators, drive devices for driving and lifting functions, electrical and hydraulic circuits for regulating or controlling the drive and lifting power as well as for steering the industrial truck, etc.

In Fig. 1, the forward and reverse directions V, R are symbolized by the arrows V, R.

A driver's cab 5 is arranged in the front area of the left side area 4 seen in the forward direction V. It includes the actuation means required to operate the industrial truck 100, such as buttons, switches, joysticks and steering wheel.

As can be seen in particular in FIG. 5, the industrial truck 100 has four wheels, the front wheels 6 assigned to the front axle A being designed as twin wheels and the rear wheels 7 assigned to the rear axle B being designed as single wheels. All of the four wheels are designed to be steerable in such a way that they can be rotated through 360 ° about their respective steering axis L. Each of the wheels is connected to its own steering motor, which cannot be seen in the drawing. All steering motors are preferably designed as electric motors and are controlled via a steering computer so that the industrial truck 100 can make changes in the direction of travel in any sequence without stopping. Thus, a loading or unloading station can be approached directly without time-consuming maneuvering.

At least one of the front wheels 6 and rear wheels 7 is coupled to a travel drive. To improve traction, all front wheels are preferably the 6 and rear wheels 7 are each coupled to a drive. The travel drive or drives can - as well as the steering motors - comprise electric motors.

As can be seen in FIG. 5, the chassis 1 has two cross members 8, which extend parallel to one another and are arranged between the front axle A and the rear axle B. They connect the side areas 3 and 4. The cross members 8 are arranged close to the ground and have a comparatively low overall height Y compared to the transverse extent X, so that only a low loading and unloading height H can be achieved with the industrial truck, as will be explained in more detail below.

From the chassis 1, two lifting masts 9, 10 extend upward. Their facing sides are at least almost flush with one another facing sides of the side areas 3, 4.

The two masts 9, 10 are used to raise and lower a loading platform 11 in a lifting and lowering device Z. It is used to carry a load, for example a container C. For this purpose, each mast 9, 10 has a flexible traction means 12, which a lower disk 13 and an upper disk 14 rotates. In the illustrated embodiment, the flexible Zugmit tel 12 includes two parallel V-belts. You are between the designed as double pulleys lower and upper discs 13, 14 spanned ge. While the upper disk 14 is mounted in a stationary bearing block 15 so that it can rotate freely about an axis 16, the lower disk 13 is connected to the drive shaft 17 of a drive device 18 in a rotationally fixed manner. The drive device 18 preferably also comprises an electric motor.

The drive device 18 is mounted on a bearing block 19 which is arranged displaceably on the lifting mast 9, 10 for the purpose of adjusting the tension of the flexible Zugmit means 12 (see in particular FIGS. 12 and 13). For this purpose, the lifting masts 9, 10 each have a bearing block receptacle 20, which has a greater extent in the clamping direction S than the bearing block 19. According to FIGS. 12 and 13 from above, two threaded holes open into the bearing block receptacle 20, into each of which a clamping screw 21 is screwed is. The front end in the screwing direction of each of the clamping screws 21 is supported on a surface of the load gerbocks 19. As is evident from FIGS. 12 and 13, the tension of the flexible traction means 12 can be changed by turning the tensioning screws 21 in and out.

The flexible traction means 12 has two strands 22, 23 running parallel to one another due to the rotation around the lower and upper disks 13, 14. So that the flexible traction means 12 of the two lifting masts 9, 10 rotate at exactly the same speed Ge, the drive shafts 17 of the two Antriebseinrich lines 18 of the lifting masts 9, 10 are preferably mechanically connected to each other via a connecting shaft 24 (see Fig. 5). By providing a connec tion shaft 24, it is basically also possible to see only a single drive motor 18 for the flexible traction means 12 of the two lifting masts 9, 10.

For the purpose of raising and lowering, the loading platform 11 is connected to one of the two strands 22, 23 of the two flexible traction means 12 of the lifting masts 9, 10, which run in the same direction when the drive devices 18 are actuated, for example with the strand 23.

To guide the loading platform 11 on the lifting masts 9, 10, guide profiles 25, 26 are provided on the lifting masts 9, 10 - as can be seen in particular in FIGS. 10 and 11 using the example of the lifting mast 9. Each guide profile 25, 26 has an internal cross-section which is approximately C-shaped. It has a base surface 27 and two mutually parallel side surfaces 28, 29 extending perpendicularly from the base surface to the open profile side 30.

The guide profiles 25, 26 are arranged on the respective lifting mast 9, 10 in such a way that their open profile sides 30 face one another.

As can be seen in Fig. 11, the loading platform 11 has on its side facing the lifting mast 9 provided there is two guide rollers 31, 32, which in the illustrated embodiment each roll on one of the two outer Bees 29 of the guide profiles 25, 26 and thus lead the guide platform 11 against displacements relative to the lift mast 9 in the VR direction of the floor conveyor. It goes without saying that the loading platform 11 can also be attached to the in Fig. 11, not shown, the other mast 10 facing side is designed accordingly. The lifting mast 10 also has guide profiles 25, 26. Finally, it should be pointed out that the guide rollers 31, 32 can also be arranged in such a way that they both roll on the central side surfaces 28 of the guide profiles 25, 26. In addition, further guide rollers, not shown in the drawing, can be provided offset in the longitudinal direction of the guide profiles 25, 26 relative to the guide rollers 31, 32, which in turn roll on one of the side surfaces 28 or 29. Because of this measure, the loading platform can also be secured against tilting in an axis running perpendicular to the plane of the drawing in FIG. 10 with the aid of the guide profiles 25, 26.

A significant advantage of the design and arrangement of the guide profiles 25, 26 and the guide rollers 31, 32 rolling in them is that forces acting on the loading platform 11 in the VR direction, as can occur in particular during loading and unloading, are directly transferred from the both masts 9, 10 are taken and there is no further, possibly technically complex measures required.

As already mentioned above, the industrial truck 100 has a particularly low loading and unloading height H. As can be seen in FIG. 7, this is essentially identical on the front and rear axles. This is caused by the training of the chassis 1 with the cross members 8 in contrast to the known U-shaped design of the chassis with a single, rear cross member, which must be made considerably more voluminous than the cross-section to achieve the required chassis rigidity two, in the longitudinal extent of the industrial truck 100 spaced from each other cross member 8. In order to minimize the loading and unloading height H, the loading platform 11 has recesses 33 on the underside for one of the cross members 8, so that the loading and unloading height H the vertical extension of the cross member 8 from the ground only slightly exceeds.

Each of the cross members 8 can comprise two struts 34, 35 which run parallel to one another and have a rectangular, preferably square cross-section. point. The struts 34, 35 are connected to one another by means of a connecting plate 36.

As can be seen, for example, in FIGS. 8 and 9, the lifting masts 9, 10 each have a base plate 37 from which a lower frame component 38, which includes the bearing block holder 20, extends upward. The unte re frame member 38 is viewed from the front or the rear of the mast 9, 10 is approximately U-shaped. Side walls 39, 40 of the lifting mast, which are provided with lateral stiffening ribs 41, 42, rest on the outer sides of its two legs. From the base plate 37 upwards, a first main frame 43 extends which comprises lateral profiles 44, 45 which are connected to one another via cross struts 46, 47, 48. Between the lower cross strut 46 and the middle cross strut 48 extend X-like angeord designated diagonal struts 49, 50. On the base plate 37, the side walls 39, 40 and the cross struts 46, 47, 48, the guide profiles 25, 26 are fastened. The lifting mast constructed in this way is characterized by considerable torsional stiffness with low weight and low manufacturing costs.

In the embodiment of the lifting mast shown in FIGS. 8, 9 and 10, the upper bearing block 15 is arranged between the central cross strut 47 and the upper cross strut 48. As can be seen by comparison with the further embodiment of a lifting mast 9, 10 shown in FIGS. 14 to 18, in this further embodiment the bearing block 15 is missing between the cross struts 47 and 48. Instead, it extends from the upper cross strut 48 upwards a second main frame 51. It has a lower cross strut 52 which is screwed to the upper cross strut 48 of the first main frame 43. A middle cross strut 55 is connected to the cross strut 52 via diagonal struts 53, 54. The bearing block 15 is arranged between this and an upper cross strut 56. The guide profiles 25, 26 extend from the base plate 37 to the cross strut 56, the guide profiles 25, 26 are longer in the lifting mast shown in FIGS. 14 to 18, for example by adding guide profiles 57 longer than in the case of FIGS. 8 to 10 illustrated trained. Accordingly, the flexible traction means 12 also has in the case of the FIGS. 14 to 18 shown Embodiments showed a greater length than those shown in FIGS. 8 to 10.

From the above explanations it can be seen that due to the modular structure of the lifting mast with a variable number of diagonal struts and cross struts, it is possible to easily provide lifting masts of different lengths that are adapted to user requirements. Furthermore, it can be seen that due to this modular structure, already existing industrial trucks with corresponding lifting masts can be adapted to changing requirements with only little effort with regard to the maximum lifting height that can be achieved with them. For this purpose, only segments, as denoted by D in FIG. 15, together with the associated guide profile sections 57 of the respective lifting mast 9, 10 are to be removed or supplemented, as is the flexible traction means 12 to be replaced by one of suitable length.

Reference list:

100 industrial truck

1 chassis

2 loading area

3 side area

4 side area

5 driver's cab

6 front wheels

7 rear wheels

8 cross members

9 mast

10 mast

11 loading platform

12 flexible traction means

13 lower double pulley

14 upper double pulley

15 bearing block

16 axis

17 drive shaft

18 Drive device

19 bearing block

20 bearing block holder

21 clamping screw

22 Trum

23 Trum

24 connecting shaft

25 guide profile

26 guide profile

27 base area

28 side face

29 side face

30 open side

31 Leadership role 32 Leadership role

33 recesses

34 strut

35 strut

36 connecting plate

37 base plate

38 Frame component

39 side wall

40 side wall

41 stiffening rib

42 stiffening rib

43 main frame

44 Profile

45 profile

46 cross brace

47 cross brace

48 cross brace

49 Diagonal bracing

50 diagonal bracing

51 additional main frame

52 cross brace

53 Diagonal bracing

54 Diagonal bracing

55 cross brace

56 cross brace

57 Guide profile section

A front axle

B rear axle

C container

D segment

H loading and unloading height

L steering axles

R reverse direction

S direction of tension V Forward travel direction X transverse extension

Y height

z Direction of raising and lowering

Claims

PalfiQlMiSpry

1. industrial truck (100),

with mutually opposite lifting masts (9, 10) for lifting, lowering and guiding a loading platform located between this form (11) in a lifting and lowering direction (Z), on which and from which loads in one direction (VR ) are slidable,

characterized,

that each of the lifting masts (9, 10) comprises at least two guide profiles (25, 26),

that each guide profile (25, 26) has an inner cross-section with a Seitenflä surface (29) which extends in the raising and lowering direction (Z) and perpendicular to the direction (V-R),

and that the loading platform (11) has at least one guide element for each guide profile (25, 26), in particular a guide roller (31, 32), which slides, in particular rolls, on the side surface (29) of the respective guide profile (25, 26).

2. Industrial truck according to claim 1, characterized in that the inner cross-sections of the guide profiles (25, 26) C-shaped, each with a Basisflä surface (27), and two mutually parallel, perpendicular from the base surface (27) to an open profile side (30) extending side surfaces (28, 29) is formed, and that the guide profiles (25, 26) are arranged on the respective lifting mast that the open profile sides (30) of the guide profiles of different lifting masts (9, 10) each other are facing.

3. Industrial truck according to claim 1 or 2, characterized in that exactly two lifting masts (9, 10) are provided.

4. Industrial truck according to one of claims 1 to 3, characterized in that exactly one guide element, insbesonde re exactly one guide roller (31, 32) is provided for each guide profile (9, 10).

5. Industrial truck according to one of claims 1 to 3, characterized in that for each guide profile (9, 10) several, preferably exactly two in the lifting and lowering direction (Z) spaced guide elements, in particular guide rollers (31, 32) are provided .

6. Industrial truck according to one of claims 1 to 5, characterized in that each lifting mast (9, 10) comprises two disks (13, 14) which are spaced apart in the lifting and lowering direction (Z) and which are supported by a flexible traction means (12 ) are rotated, one of the disks (13, 14) being rotatable by means of a drive device (18).

7. Industrial truck according to claim 6, characterized in that the flexible traction means (12) comprises two strands (22, 23) extending in the raising and lowering direction (Z).

8. Industrial truck according to claim 7, characterized in that the loading platform is connected to two parallel strands (23) of the flexible traction means (12) of the two lifting masts (9, 10).

9. Industrial truck according to one of claims 6 to 8, characterized in that the drive device (18) comprises at least one electric motor.

10. Industrial truck according to claim 9, characterized in that the industrial truck (100) comprises steering motors and travel drives, the steering motors and the travel drives being designed to be electrically operated.