Vibrating table for vibrating stacked goods present in sheet layers and corresponding method for operating the vibrating table

Abstract

The invention relates to a vibrating table for vibrating stacked material arranged in layers of sheets. The invention further relates to a method for operating such a vibrating table. The vibrating table has a vibrating device (9), wherein the vibrating device has a first unbalance unit (10), wherein the first unbalance unit (10) has a first drive shaft with a first unbalance element (12), wherein the first drive shaft is rotatable about a common axis of rotation (D), wherein the first unbalance unit (10) has a first drive (13), wherein the first drive (13) is configured to drive the rotation of the first drive shaft about the common axis of rotation (D), wherein the vibrating device (9) has a second unbalance unit (20), wherein the second unbalance unit (20) has a second drive shaft with a second unbalance element (22), wherein the second drive shaft is rotatable about the common axis of rotation (D).wherein the second unbalance unit (20) has a second drive (23), wherein the second drive (23) is configured to drive the rotation of the second drive shaft about the common axis of rotation (D), wherein the first drive shaft and the second drive shaft are mechanically decoupled from each other.

Description

[0001] The invention relates to a vibrating table for vibrating stacked material arranged in layers of sheets. The invention further relates to a method for operating such a vibrating table.

[0002] Shaking tables typically feature a tiltable support table, which has a support surface for placing the stacked material, a rear stop for the stacked material, and at least one lateral stop for the stacked material. The support table can be tilted from a horizontal position towards the two stops. Furthermore, a shaking table typically includes a shaking mechanism designed to set the support table into a vibrating motion. The tilting of the support table and the vibrating motion ensure that the individual sheets or sheets align precisely with the edges against the stops.To prevent unwanted shifting of the stacked, aligned material after vibration, the stacked material is typically clamped between the support table and the clamping device. An air ejector is then used to remove the air between the individual layers of the stacked material. After de-aeration, the stack forms a compact block and can, for example, be fed to a subsequent cutting station.

[0003] When vibrating stacked, sheet-like materials, a problem arises because the individual sheets have different properties, for example, being made of paper or film, which means they exhibit different characteristics. Especially with films, sheets can become charged and therefore adhere to each other particularly strongly. Thus, the material properties of each sheet result in different requirements for vibrating the stack. Furthermore, the weight and height of the stack also influence the vibrating requirements. A taller stack on the support table, and therefore a heavier stack, necessitates a different vibration behavior than a shorter stack.In practice, the rotational speed of the unbalanced weight is therefore changed, for example, by varying the speed of an electric drive used to power it. This leads to a change in the frequency at which the support table oscillates or vibrates. A particular disadvantage is the risk of the vibrating table operating at its resonant speed; this represents a critical operating condition that should be avoided.

[0004] EP 2 724 966 A1 describes a method for vibrating stacked, sheet-shaped material using a vibrating table, as well as a device for carrying out the method. The device for carrying out the method comprises a first unbalanced body and a second unbalanced body. These are mechanically coupled and can be rotated by means of a common first drive. The unbalanced bodies can be adjusted relative to each other by means of a second drive.

[0005] The object of the present invention is to provide a vibrating table characterized by a particularly high degree of variability with regard to the vibrating motion of the support table, in particular to achieve the desired vibrating result for a wide variety of stacked goods. Furthermore, it is an object of the invention to provide a method for operating such a vibrating table.

[0006] These tasks are solved by the subject matter of independent claims. Advantageous further training is the subject matter of dependent claims.

[0007] The vibrating table according to the invention is a vibrating table for shaking stacked material in sheets, in particular stacked printed sheets. The vibrating table according to the invention serves in particular to align the printed sheets of the stacked material precisely with respect to each other, in order to feed the stacked printed sheets to a cutting device for cutting after alignment. The vibrating table has at least the following components: a tiltable support table, wherein the support table has a support surface for placing the stacked goods, a vibrating device configured to set the support table in a vibrating motion, wherein the vibrating device has a first unbalance unit, wherein the first unbalance unit has a first drive shaft with a first unbalance element, wherein the first drive shaft is rotatable about a common axis of rotation, wherein the first unbalance unit has a first drive, wherein the first drive is configured to drive the rotation of the first drive shaft about the common axis of rotation, wherein the vibrating device has a second unbalance unit, wherein the second unbalance unit has a second drive shaft with a second unbalance element, wherein the second drive shaft is rotatable about the common axis of rotation, and wherein the second unbalance unit has a second drive.wherein the second drive is configured to drive the rotation of the second drive shaft about the common axis of rotation, wherein the first drive shaft and the second drive shaft are mechanically decoupled from each other.

[0008] Because the first and second drive shafts are mechanically decoupled with respect to their rotation around the common axis of rotation, they can rotate separately and independently. In other words, the first and second drive shafts are mechanically decoupled in terms of their rotation. This allows the vibration motion of the support table to be adjusted over a wide range, particularly to achieve different vibration patterns, such as cyclic or periodic changes in vibration frequency and / or amplitude.

[0009] For example, by changing the angular offset of the first drive shaft relative to the second drive shaft, while maintaining identical rotational speeds for both shafts, the resulting imbalance and thus the amplitude of the vibration motion of the vibration device can be altered. It is conceivable that the imbalance of the first and second drive shafts is identical in magnitude, so that by offsetting the first and second imbalance elements by 180°, while maintaining the same direction of rotation and identical rotational speeds for both shafts, the resulting imbalance of the vibration device will be at least approximately zero, provided that when the first and second drive shafts rotate in the same direction and at the same speed, little or no vibration motion is transmitted to the support table.By changing the angular offset between the first and second unbalanced elements, the resulting imbalance can be varied between a minimum and a maximum value. With identical imbalances in magnitude for the first and second drive shafts, the total or resulting imbalance can be set between 0% and 100% of the maximum possible resulting imbalance by changing the angular offset between the first and second drive shafts in the range of 0° to 360°.

[0010] Furthermore, the mechanical decoupling of the first drive shaft from the second drive shaft allows for a wide range of variation in the vibration motion of the vibration device and thus of the support table. For example, it is conceivable that the first and second drive shafts can be operated at different speeds. It is also conceivable that the first and second drive shafts can be operated in the same or opposite directions of rotation around their common axis. This allows for a wide variety of vibration patterns of the support table. Additionally, it is conceivable to change the first speed at which the first drive shaft rotates around the common axis and / or the second speed at which the second drive shaft rotates around the common axis during a vibration process, particularly by changing them periodically.

[0011] With the vibrating table, it is possible, for example, to operate the first and second drive shafts in opposite directions, thus achieving a directed vibration. In this context, it is considered particularly advantageous if, when the first and second drive shafts rotate in opposite directions, the initial rotational speed of the first drive shaft and the second rotational speed of the second drive shaft are the same. In this way, a directed vibration of the support table, for example, a linear, unidirectional vibration of the support table, such as along the transverse direction of the support table, can be achieved.

[0012] The first drive is preferably designed to operate the first drive shaft in a speed range from 0 rpm to 4000 rpm.

[0013] The second drive is preferably designed to operate the second drive shaft in a speed range from 0 rpm to 4000 rpm.

[0014] Preferably, the first unbalance unit comprises a first gearbox, wherein a first output shaft of the first drive is coupled to the first drive shaft via the first gearbox. The first gearbox preferably has a gear ratio greater than 1.0.

[0015] Preferably, the second unbalance unit has a second gearbox, wherein a second output shaft of the second drive is coupled to the second drive shaft via the second gearbox. The second gearbox preferably has a gear ratio greater than 1.0.

[0016] Preferably, the vibrating table has a base in which the support table is resiliently, and thus elastically, mounted in a receptacle of the base. This allows the support table to vibrate relative to the base, or at least partially decouples the base from the support table in terms of vibration, thus preventing the base from vibrating during operation of the vibrating table. This prevents the vibrating table from shifting due to the vibration of the support table.

[0017] It is considered advantageous if the support table has a rear stop for the stacked goods placed on it and at least one side stop for the stacked goods placed on it, wherein the support table can be tilted from a horizontal position in the direction of at least one of the two stops.

[0018] In a particularly preferred embodiment, the first drive shaft and the second drive shaft are rotatable in opposite directions, i.e., in opposite directions of rotation, about the common axis of rotation. This makes it possible to achieve a vibrating motion along a linear axis, for example, along a transverse direction of the support table.

[0019] Preferably, the first drive shaft and the second drive shaft are arranged nested inside each other.

[0020] In order to achieve a particularly compact design and especially to position the first unbalance element and the second unbalance element particularly close to each other along the common axis of rotation, it is considered advantageous if the second drive shaft has a hollow shaft, with the first drive shaft passing through the hollow shaft along the common axis of rotation.

[0021] It is entirely conceivable that the first unbalance element is an integral part of the second drive shaft, and / or that the second unbalance element is an integral part of the second drive shaft. For example, the first drive shaft and the first unbalance element could be integrated into a single component, which might be monolithic, such as a monolithic casting. The same applies to the second drive shaft and the second unbalance element.

[0022] In a further embodiment, it is provided that the first unbalance element is detachably attached to the first drive shaft and / or the second unbalance element is detachably attached to the second drive shaft.

[0023] It is considered particularly advantageous if the first drive and / or the second drive has an electrically powered motor.

[0024] It is considered particularly advantageous if the first drive and / or the second drive incorporates a servo motor. Servo motors enable particularly precise control of the rotational speed and / or angular position thanks to the servo controller.

[0025] It is considered particularly advantageous if both the first and second drives each have a servo motor. This design allows for very precise adjustment and continuous maintenance of the rotational speed, and thus the rotational speeds, of the first and second drive shafts. Furthermore, by incorporating a suitable control device, the rotational speeds, and therefore the rotational speeds, of the first and second drive shafts can be precisely coordinated. Using a separate servo motor for the first and second drives allows for the precise creation of desired vibration patterns by correspondingly varying the rotational speeds of the servo motors, and thus of the first and second drive shafts. This results in exceptionally good vibration performance.

[0026] To transmit a rotary motion from the first drive to the first drive shaft, it is considered advantageous for the first unbalance unit to have a first belt drive, with the first drive and the first drive shaft being coupled via the first belt drive. For the same reason, it is considered advantageous for the second unbalance unit to have a second belt drive, with the second drive and the second drive shaft being coupled via the second belt drive. A belt drive has the advantage that, despite any vibration or shaking of the respective drive shaft, a stable coupling to the respective drive is ensured, since a belt drive can absorb such vibrations, at least partially, via the belt.This has a beneficial effect on the stability of the coupling between the respective drive and the respective drive shaft, as well as on the longevity of the respective drive.

[0027] It is considered particularly advantageous if the first belt drive has a first toothed belt, wherein this first toothed belt meshes with a first toothed belt wheel of the first drive, and a first synchronous disc is fixed to the first drive shaft, wherein the first toothed belt meshes with the first synchronous disc.

[0028] With regard to the second belt drive, it is considered advantageous if the second belt drive has a second toothed belt, wherein this second toothed belt meshes with a second toothed belt wheel of the second drive, and a second synchronous disc is attached to the second drive shaft, wherein the second toothed belt meshes with the second synchronous disc.

[0029] It is considered particularly advantageous if the vibration device has a bearing body with a first bearing section and a second bearing section, wherein the second bearing section is opposite the first bearing section in the direction of the common axis of rotation, wherein the first drive shaft is rotatably mounted in the first bearing section about the common axis of rotation and is rotatably mounted in the second bearing section about the common axis of rotation.

[0030] It is considered particularly advantageous if the first drive shaft has a first axial end and a second axial end, wherein the first axial end protrudes in the direction of the common axis of rotation relative to the second drive shaft and the second axial end of the first drive shaft protrudes on the opposite side of the second drive shaft relative to the second drive shaft in the direction of the common axis of rotation.

[0031] It is considered particularly advantageous if the first drive shaft is supported by at least one rolling bearing in the first bearing section and by at least one further rolling bearing in the second bearing section.

[0032] It is considered particularly advantageous if the second drive shaft is rotatably mounted on the first drive shaft about the common axis of rotation.

[0033] It is considered particularly advantageous if the first drive shaft and the second drive shaft are rotatably mounted to each other via at least one rolling bearing, preferably rotatably mounted to each other via at least two rolling bearings, and in particular rotatably mounted to each other via exactly two rolling bearings.

[0034] It is considered particularly advantageous if the bearing body has a mounting section, wherein the vibration device is attached to the support table in the area of ​​the mounting section.

[0035] For example, the vibrating device can be attached to the underside of the support table opposite the support surface, in particular by being screwed on.

[0036] It is considered particularly advantageous if the common axis of rotation is angled, especially perpendicular, to the support surface. Such a design has proven to be particularly beneficial with regard to the especially fast and accurate alignment of the material to be vibrated.

[0037] In a particularly preferred embodiment, the vibration device comprises a first sensor device, wherein the first sensor device is configured to detect whether the first drive shaft is in a first reference angular position, and / or wherein the vibration device comprises a second sensor device, wherein the second sensor device is configured to detect whether the second drive shaft is in a second reference angular position.This design allows for a reference run of the first and second drive shafts before starting a vibration process. This enables the determination of the angular position of the first drive shaft, particularly of the first unbalanced element, and / or the angular position of the second drive shaft, particularly of the second unbalanced element, and specifically to determine and, if necessary, adjust any angular offset between the first and second drive shafts. Precise knowledge of the angular position of the first and second drive shafts is also of particular importance when a vibration process with directed oscillation is to be achieved.

[0038] In connection with the first sensor device and / or the second sensor device, it is considered particularly advantageous if the first sensor device has a first proximity sensor, wherein the first proximity sensor is configured to detect an approach of a surface of the first unbalanced element, and / or wherein the second sensor device has a second proximity sensor, wherein the second proximity sensor is configured to detect an approach of a surface of the second unbalanced element.

[0039] In one embodiment, it is provided that the respective surface is a circumferential surface of the respective unbalance element.

[0040] In a further embodiment, the surface of the respective unbalance element is an end face of the respective unbalance element. Preferably, the respective end face is formed perpendicular to the common axis of rotation.

[0041] In a preferred embodiment, the first unbalance element and / or the second unbalance element are designed in the shape of a circular segment.

[0042] In a particularly preferred embodiment, the first unbalance unit comprises at least one first unbalance element, wherein the at least one first unbalance element is detachably connected to the first drive shaft, and / or wherein the second unbalance unit comprises at least one second unbalance element, wherein the at least one second unbalance element is detachably connected to the second drive shaft. By providing a first unbalance element or a second unbalance element, the unbalance mass of the first drive shaft or the second drive shaft can be changed, respectively, by operating the vibration device with and / or without the first unbalance element, and / or by operating the vibration device with and / or without the second unbalance element.Connecting the first unbalance element to the first drive shaft can, for example, increase the imbalance or unbalance mass of the first drive shaft. The same applies to the second unbalance element and the second drive shaft.

[0043] In a preferred embodiment, a set of first unbalance elements is provided, wherein the set of first unbalance elements comprises at least two first unbalance elements that differ with respect to their unbalance. Similarly, a second set of second unbalance elements can be provided for the second drive shaft.

[0044] The first unbalance element can, for example, be detachably attached to the first unbalance element, in particular screwed to it. The same applies to the second unbalance element and the second unbalance element.

[0045] It is considered particularly advantageous if the vibration device has a control device, wherein the control device is configured to control the first drive and the second drive in such a way that the first drive shaft rotates at a first speed in a first direction of rotation about the common axis of rotation and the second drive shaft rotates mechanically or rotationally decoupled from the first drive shaft at a second speed in a second direction of rotation about the common axis of rotation.

[0046] In principle, it is conceivable to control the first and second drives during a vibration process in such a way that the first drive shaft rotates around the common axis of rotation, while the second drive shaft does not rotate around the common axis of rotation, i.e., it remains stationary. Furthermore, it is also conceivable to control the first and second drives in such a way that the second drive shaft rotates around the common axis of rotation, while the first drive shaft does not rotate around the common axis of rotation.

[0047] In a particularly preferred embodiment, the control device is configured to control the first drive and the second drive in such a way that the first and second speeds are different and / or the first and second directions of rotation are opposite. In this way, the control device enables a wide variety of vibration patterns or modes to be achieved with the vibration device.

[0048] It is considered particularly advantageous if, at the beginning of a vibration process, the first and second drives are started with an angular offset between the first and second unbalance elements that corresponds to a minimal total imbalance or a minimal resulting imbalance. This prevents the uppermost leaf layers from slipping when the two drives start.

[0049] Furthermore, it is considered advantageous if the control device is configured to actuate the first and second drives in such a way that the first and second drives are decelerated at the end of the vibration process with an angular offset between the first and second unbalance elements that corresponds to the minimum total unbalance or the minimum resulting unbalance. This prevents the uppermost leaf layers from slipping when the rotational speeds of the first and second drives are reduced at the end of the vibration process.

[0050] In one embodiment, the control device is configured to control the first drive and the second drive in such a way that the first direction of rotation and the second direction of rotation are opposite and the first speed and the second speed are the same.

[0051] In one embodiment, the control device is configured to control the first drive and the second drive such that the first and second directions of rotation are opposite, and one of the first and second rotational speeds is greater than the other, wherein the greater rotational speed of the first and second rotational speeds is an integer multiple of the lesser rotational speed of the first and second rotational speeds. For example, the first rotational speed can be twice as large as the second rotational speed.

[0052] In one embodiment, the control device is configured to control the first drive and the second drive in such a way that the first direction of rotation and the second direction of rotation are in the same direction and one of the first speed and the second speed is greater than the other, wherein the greater speed of the first speed and the second speed is an integer multiple of the lesser speed of the first speed and the second speed.

[0053] For example, the first rotational speed can be twice as high as the second rotational speed.

[0054] It is considered particularly advantageous if the control device is configured to control the first drive such that, during a vibration process, the rotational speed of the first drive shaft is periodically varied between a first minimum value and a first maximum value, and / or to control the second drive such that the rotational speed of the second drive shaft is periodically varied between a second minimum value and a second maximum value, also with a second period. In this way, vibration patterns can be generated, in particular with a cyclic change in the frequency of the vibration and / or a cyclic change in the amplitude of the vibration. For example, the first period can be twice as long as the second period.

[0055] The first minimum value, the second minimum value, the first maximum value, and the second maximum value are preferably adjustable. This allows for adaptation to the material being vibrated. The first minimum value, the second minimum value, the first maximum value, and the second maximum value can, for example, be set between their respective minimum and maximum possible values. These minimum and maximum possible values ​​may be limited, for example, by the design of the first and second drives. An adjustment range for the first minimum value could, for example, be from 400 rpm to 3000 rpm. An adjustment range for the first maximum value could, for example, be from 1000 rpm to 5000 rpm. The first minimum value could then, for example, be 2000 rpm, and the first maximum value could then, for example, be 4000 rpm.The setting range for the second minimum value could, for example, be from 400 rpm to 3000 rpm. The setting range for the second maximum value could, for example, be from 1000 rpm to 5000 rpm. The second minimum value could then, for example, be 3000 rpm, and the second maximum value could then, for example, be 3500 rpm.

[0056] The first and second periods are preferably adjustable. This allows for adaptation to the material being vibrated. The first period can preferably range from 0.5 seconds to 20.0 seconds, and in particular from 1.0 second to 15.0 seconds. The second period can preferably range from 0.5 seconds to 20.0 seconds, and in particular from 1.0 second to 15.0 seconds. These period lengths have surprisingly proven to be particularly advantageous for achieving a good vibration result in a short time.

[0057] It is considered particularly advantageous if the control device is configured to control the first drive and the second drive in such a way that the first speed is constant while the second speed is periodically varied with a second period between a second minimum value and a second maximum value, or to control in such a way that the second speed is constant while the first speed is periodically varied with a first period between a first minimum value and a first maximum value.

[0058] The method according to the invention relates to a method for operating the above-described vibrating table, wherein during a vibrating process a first rotational speed of the first drive shaft is periodically varied with a first period between a first minimum value and a first maximum value and / or a second rotational speed of the second drive shaft is periodically varied with a second period between a second minimum value and a second maximum value.

[0059] Preferably, the larger period of the first period and the second period is an integer multiple of the smaller period of the first period and the second period.

[0060] The explanations regarding the advantages and beneficial further developments of the vibrating table apply accordingly to the process and vice versa.

[0061] The following figures explain the invention in more detail using one exemplary embodiment, without being limited to this embodiment. They show: Figure 1 an embodiment of a vibrating table according to the invention in a perspective view from an oblique angle above, Figure 2 the shaking table according to Figure 1 in a perspective view from a low angle, Figure 3 a vibrating device of the vibrating table according to Figure 1 in an isolated representation, Figure 4 the vibrating device according to Figure 3 in a view according to arrow IV in Figure 6 , Figure 5 the vibrating device in a sectional view according to line VV in Figure 4 , Figure 6 the vibrating device in a view according to arrow VI in Figure 4 , Figure 7a relationship between a resulting imbalance and an angular offset between a first unbalance element and a second unbalance element of the vibration device in a schematic representation, Figure 8a the first and second unbalanced elements at an angular offset of 180° in a top view along an axis of rotation, Figure 8b the order according to Figure 8a in a perspective view, Figure 9a the first unbalance element and the second unbalance element at an angular offset of 90° in a top view along the axis of rotation, Figure 9b the order according to Figure 9a in a perspective view, Figure 10a the first unbalance element and the second unbalance element at an angular offset of 0° in a top view along the axis of rotation, Figure 10b the order according to Figure 10a in a perspective view, Figure 11an embodiment of a first unbalance element together with a first unbalance element in an unconnected state, Figure 12 the order according to Figure 11 in a state in which the first unbalance element is connected to the first unbalance element, Figure 13 the first unbalanced element according to Figure 11 together with a set of different first unbalance change elements.

[0062] In the figures, the spatial directions, namely the vertical vertical direction Z, the horizontal transverse direction Y and the horizontal longitudinal direction X, are indicated by arrows.

[0063] The Fig. 1 and 2 Figure 1 shows a vibrating table for vibrating stacked material arranged in sheets. The stacked material can consist of printed sheets stacked in one direction.

[0064] The vibrating table 1 has a base 2 and a tiltable support table 4 mounted in the base 2, the support table 4 having a support surface 5 for placing the stacked goods on it. In the Figure 1 and 2 The support table 4 is not inclined, so that the support surface 5 is horizontally aligned.

[0065] The support table 4 has a rear stop 6, a first lateral stop 7, and a second lateral stop 8 for the stacked goods placed on it. The components of the support table 5 are described in more detail below with reference to the spatial directions. For the sake of clarity, the following description assumes an uninclined position of the support table 4 and thus a horizontal orientation of the support surface 5.

[0066] The rear stop 6 can be moved in the vertical direction Z, allowing it to be moved into a lowered position where it is shifted downwards relative to the support surface 5 and thus does not protrude from it. In the lowered position of the rear stop 6, the stacked goods can be pushed off the support surface 5 in the longitudinal direction X. The first lateral stop 7 and the second lateral stop 8 can each be moved from a vertical to a horizontal position. Fig. 1 The first lateral stop 7 is in the vertical position and the second lateral stop 8 is in the horizontal position. The rear stop 6 and the first lateral stop 7 form a right angle and serve to align stacked goods resting on the support surface 5 during the vibrating process.

[0067] In order to align the stacked goods 2 resting on the support surface 5, the support table 4 is tilted from a horizontal position, i.e. from a position in which the support surface 5 is horizontally aligned, in the direction of the two stops 6, 7 in order to achieve edge-accurate alignment of the stacked goods 2 against the stops 6, 7.

[0068] On the underside of the support table 4, two guide rails 3 are arranged laterally for a U-shaped portal frame 80 spanning the support table 4. The portal frame 80 is movable parallel to the support surface 5 in the longitudinal direction X towards the rear stop 6 and vice versa. A stripping device 70 in the form of a roller is mounted in the portal frame 9. This device is designed to expel the air from the stacked material 2 following a vibration process. To expel the air, the stripping device 70 is lowered onto the stacked belt and then moved in the longitudinal direction X by means of the portal frame 80 to expel the air between the individual layers of the stacked material.

[0069] A vibrating device 9 is attached to the underside of the support table 4 opposite the support surface 5 in the vertical direction Z, and is designed to set the support table 4 and thus the support surface 5 into a vibrating or shaking motion.

[0070] The vibrating device 9 is in the Figs. 1 to 6 Shown in isolation. The vibrating device 9 has a first unbalance unit 10 and a second unbalance unit 20.

[0071] The first unbalance unit 10 has a first drive shaft 11 with a first unbalance element 12. The first unbalance element 12 is designed as a circular segment and is integrally formed with the first drive shaft 11. The first drive shaft 11 is rotatable about a common axis of rotation D. For this purpose, the first unbalance unit 10 has a first drive 13, which comprises a servo motor. The first drive 13 is configured to drive the rotation of the first drive shaft 11 about the common axis of rotation D. For this purpose, the first unbalance unit 10 has a first belt drive, the first drive 13 and the first drive shaft 11 being coupled via the first belt drive. The first belt drive has a first toothed belt 14.The first drive 13 has a first output shaft with a first toothed belt pulley 15, and a toothed first synchronous disc 16 is fixedly attached to the first input shaft 11. The first toothed belt 14 meshes with the first toothed belt pulley 15 and with the first synchronous disc 16 to transmit the rotation of the first toothed belt pulley 15 to the first synchronous disc 16 and thus to the first input shaft 11. In this case, the first belt drive provides a gear ratio of approximately 2.0, so that the first input shaft 11 rotates at about half the speed of the first output shaft.

[0072] The second unbalance unit 20 has a second drive shaft 21 with a second unbalance element 22. The second unbalance element 22 is designed as a circular segment and is positively locked to the second drive shaft 21. The second drive shaft 21 is also rotatable about the common axis of rotation D. For this purpose, the second unbalance unit 20 has a second drive 23, which also includes a servo motor. The second drive 23 is configured to drive the rotation of the second drive shaft 21 about the common axis of rotation D. For this purpose, the second unbalance unit 20 has a second belt drive, the second drive 23 and the second drive shaft 21 being coupled via the second belt drive. The second belt drive has a second toothed belt 24.The second drive 23 has a second output shaft with a second toothed belt pulley 25, and a toothed second synchronous disc 26 is fixedly attached to the second input shaft 21. The second toothed belt 24 meshes with the second toothed belt pulley 25 and with the second synchronous disc 26 to transmit the rotation of the second toothed belt pulley 25 to the second synchronous disc 26 and thus to the second input shaft 21. In this case, the second belt drive provides a gear ratio of approximately 2.0, so that the second input shaft 21 rotates at about half the speed of the second output shaft.

[0073] The first drive shaft 11 and the second drive shaft 21 are mechanically decoupled from each other, such that they can rotate independently about their common axis of rotation D. Conversely, the second drive shaft 21 can also rotate independently of the first drive shaft 11 about their common axis of rotation D. Thus, the first drive shaft 11 is mechanically decoupled from the second drive shaft 21 with respect to its rotation about their common axis of rotation D, and vice versa. This allows, for example, the first drive shaft 11 and the second drive shaft 21 to rotate in opposite directions, i.e., in opposite directions, about their common axis of rotation D.

[0074] The second drive shaft 21 is designed as a hollow shaft, wherein the second unbalance element 22 is formed in one piece with the hollow shaft, as shown in particular in the sectional view according to Fig. 5 can be seen.

[0075] The vibrating device 9 has a bearing body 30, the bearing body 30 comprising a first bearing section 31 and a second bearing section 32. The second bearing section 32 is located opposite the first bearing section 31 in the direction of the common axis of rotation D. Opposite end sections of the first drive shaft 11 each project towards the second drive shaft 21 along the common axis of rotation D. The first drive shaft 11 is supported by one of its end sections in the first bearing section 31 and in the second bearing section 32. The bearing arrangement is rotatable, with the rotatability being realized by means of a rolling bearing 35, which is inserted in the first bearing section 31 and in the second bearing section 32, respectively.

[0076] The second drive shaft 21 is rotatably mounted on the first drive shaft 11 about the common axis of rotation D. This rotatable mounting is achieved by two rolling bearings 34 arranged offset along the common axis of rotation D, which are positioned radially between an outer surface of the first drive shaft 11 and an inner surface of the second drive shaft 21.

[0077] The bearing body 30 has a plate-shaped mounting section 33, wherein the vibrating device 9 is attached to the support table 4 in the area of ​​the mounting section 33, such that the common axis of rotation D runs perpendicular to the support surface 5.

[0078] During the Figures 3 to 6 In the vibrating device 9 shown, the first unbalance element 12 and the second unbalance element 22 are essentially identical, so that an essentially identical unbalance results for the respective drive shaft 11, 21.

[0079] Changing the angular offset between the first drive shaft 11 and the second drive shaft 21, also known as phase shift, allows for the adjustment of the resulting imbalance or the total imbalance when the first drive shaft 11 and the second drive shaft 21 rotate in the same direction at the same speed.

[0080] The relationship between the angular offset and the resulting imbalance is shown schematically in the Figure 7 As shown. With identical imbalance of the first drive shaft 11 and the second drive shaft 21, a resulting imbalance of zero, or 0% of a maximum imbalance, occurs with an angular offset of 180°. Shown in the Figure 7 This is an angular offset of 180°. An angular offset of 180° is also found in the Figures 8a and 8bAs shown. With an angular offset of 0° between the first drive shaft 11 and the second drive shaft 21, the maximum possible resulting imbalance, or a resulting imbalance of 100%, occurs. An angular offset of 0° is in the Figures 10a and 10b As shown. With an angular offset of 90°, a resulting imbalance occurs that corresponds to 50% of the maximum possible resulting imbalance. An angular offset of 90° is in the Figures 9a and 9b depicted.

[0081] The vibration device 9 comprises a first sensor device 41, the first sensor device 41 being configured to detect whether the first drive shaft 11 is in a first reference angular position. The vibration device 9 further comprises a second sensor device 42, the second sensor device 43 being configured to detect whether the second drive shaft 21 is in a second reference position. For this purpose, the first sensor device 41 comprises a first proximity sensor 43, the first proximity sensor 43 being configured to detect an approach of a circumferential surface of the first unbalance element 12. Similarly, the second sensor device 42 comprises a second proximity sensor 44, the second proximity sensor 44 being configured to detect an approach of a surface of the second unbalance element 22.For this purpose, the first proximity sensor 43 and the second proximity sensor 44 are aligned in the direction of the common axis of rotation D.

[0082] The vibrating device 9 has a [feature] in the Figure 6The control device 60 is shown only schematically. The control device 60 is configured to control the first drive 13 and the second drive 23. The control can be effected such that the first drive shaft 11 rotates at a first speed in a first direction of rotation about the common axis of rotation D, and the second drive shaft 21 rotates independently of the first drive shaft 11 at a second speed in a second direction of rotation about the common axis of rotation D. It is entirely conceivable that the first and second speeds are different. Furthermore, it is entirely conceivable that the first and second directions of rotation are different, so that the first drive shaft 11 rotates in the opposite direction to the second drive shaft 21 about the common axis of rotation D.

[0083] For example, the control unit 60 can control the first drive 13 and the second drive 23 such that the first and second directions of rotation are opposite and the first and second rotational speeds are the same. This allows a directed oscillation to be achieved, for example along the longitudinal direction X or along the transverse direction Y.

[0084] Furthermore, the control device 60 can be configured to control the first drive 13 and the second drive 23 in such a way that during a vibration process the first rotational speed of the first drive shaft 11 is periodically varied with a first period between a first minimum value and a first maximum value of the rotational speed, and a second rotational speed of the second drive shaft 21 is periodically varied with a second period between a second minimum value and a second maximum value.

[0085] The vibrating table 1 enables a wide variety of vibration movements, particularly periodic vibration patterns, to be achieved by appropriately controlling the drives 13 and 23 via the control unit 60. Furthermore, the resulting imbalance can be changed or adjusted by setting the angular offset between the first drive shaft 11 and the second drive shaft 21. This adjustment can also be made during a vibration process. With appropriate control of the drives 13 and 23, a directed vibration movement and / or an oscillating vibration movement can be achieved. Additionally, vibration patterns can be generated by periodically varying at least one of the rotational speeds of the first drive 11 or the second drive 21; for example, the vibration frequency and / or amplitude of the vibration movement can be cyclically changed.In particular, the passage of the resonant frequency of the support table 5 and / or the vibrating table 1 can be prevented or at least its oscillation can be attenuated by suitable control of the first drive 13 and the second drive 23. In particular, when the first drive 11 and the second drive 12 are started, the angular offset between the unbalance elements 12, 22 can be adjusted such that the resulting unbalance is small or even zero.

[0086] The Figure 11 Figure 1 shows a possible embodiment of the first unbalance element 12, which can be detachably connected to the first drive shaft 11, wherein an optional first unbalance replacement element 51 can be attached to the first unbalance element 12, as shown schematically in the Figure 11 shown. Figure 12Figure 1 shows the first unbalance element 12 and the first unbalance replacement element 51 in a connected state. By attaching the first unbalance replacement element 51 to the first unbalance element 12, the unbalance of the first drive shaft 11 can be increased.

[0087] The Figure 13 The first unbalanced element 12 shows according to Figure 11 together with four different first unbalance elements 51A, 51B, 51C, 51D, each of which can be detachably connected to the second unbalance element 12. The masses of the four different first unbalance elements 51A, 51B, 51C, 51D are different and are represented according to the Figure 13From left to right. By attaching or replacing the first unbalance elements 51A, 51B, 51C, 51D on the first unbalance element 12, the unbalance of the second drive shaft 12 can be changed. This allows the unbalance to be adapted to the stacked material being vibrated; for example, the unbalance of the first drive shaft 11 can be increased if the stack weight of the material being vibrated is relatively high. Reference symbol list

[0088] 1 Vibrating table 3 Guide rails 4 Support table 5 Support surface 6 Rear stop 7 First side stop 8 Second side stop 9 Vibrating device 10 First unbalance unit 11 First drive shaft 12 First unbalance element 13 First drive 14 First toothed belt 15 First toothed belt pulley 16 First synchronizing disc 20 Second unbalance unit 21 Second drive shaft 22 Second unbalance element 23 Second drive 24 Second toothed belt 25 Second toothed belt pulley 26 Second synchronizing disc 30 Bearing body 31 First bearing section 32 Second bearing section 33 Mounting section 35 Rolling bearing 41 First sensor unit 42 Second sensor unit 43 First proximity sensor 44 Second proximity sensor 51 First unbalance replacement element 60 Control unit 70 Cleaning device 80 Portal frame X Longitudinal direction Y Transverse direction Z Vertical direction

Claims

1. A vibrating table (1) for vibrating stacked material in sheets, comprising: - a tiltable support table (4), wherein the support table (4) has a support surface (5) for placing the stacked material on it, - a vibrating device (9) configured to set the support table (4) into a vibrating motion, wherein the vibrating device (9) has a first unbalance unit (10), wherein the first unbalance unit (10) has a first drive shaft (11) with a first unbalance element (12), wherein the first drive shaft (11) is rotatable about a common axis of rotation (D), wherein the first unbalance unit (10) has a first drive (13), wherein the first drive (13) is configured to drive the rotation of the first drive shaft (11) about the common axis of rotation (D), wherein the vibrating device (9) has a second unbalance unit (20),wherein the second unbalance unit (20) has a second drive shaft (21) with a second unbalance element (22), wherein the second drive shaft (21) is rotatable about the common axis of rotation (D), wherein the second unbalance unit (20) has a second drive (23), wherein the second drive (23) is configured to drive the rotation of the second drive shaft (21) about the common axis of rotation (D), wherein the first drive shaft (11) and the second drive shaft (21) are mechanically decoupled from each other.

2. Shaking table (1) according to claim 1, wherein the first drive shaft (11) and the second drive shaft (21) are rotatable in opposite directions about the common axis of rotation (D).

3. Shaking table (1) according to claim 1 or 2, wherein the second drive shaft (21) has a hollow shaft, wherein the first drive shaft (11) passes through the hollow shaft along the common axis of rotation (D).

4. Shaking table (1) according to one of claims 1 to 3, wherein the first drive (11) and / or second drive (21) comprise a servo motor.

5. Shaking table (1) according to one of claims 1 to 4, wherein the first unbalance unit (10) has a first belt drive, wherein the first drive (13) and the first drive shaft (11) are drive-coupled via the first belt drive and / or wherein the second unbalance unit (20) has a second belt drive, wherein the second drive (23) and the second drive shaft (21) are drive-coupled via the second belt drive.

6. Shaking table (1) according to one of claims 1 to 5, wherein the shaking device (9) has a bearing body (30) with a first bearing section (31) and with a second bearing section (32), wherein the second bearing section (32) is opposite the first bearing section (31) in the direction of the common axis of rotation (D), wherein the first drive shaft (11) is rotatably mounted in the first bearing section (31) about the common axis of rotation (D) and is rotatably mounted in the second bearing section (32) about the common axis of rotation (D), wherein the second drive shaft (21) is rotatably mounted on the first drive shaft (11) about the common axis of rotation (D).

7. Shaking table (1) according to one of claims 1 to 6, wherein the common axis of rotation (D) is angled, in particular perpendicular, to the support surface (5).

8. Shaking table (1) according to one of claims 1 to 7, wherein the shaking device (9) has a first sensor device (41), wherein the first sensor device (41) is configured to detect whether the first drive shaft (11) is in a first reference angular position, and / or wherein the shaking device (9) has a second sensor device (42), wherein the second sensor device (42) is configured to detect whether the second drive shaft (21) is in a second reference angular position.

9. Shaking table (1) according to claim 8, wherein the first sensor device (41) has a first proximity sensor (43), wherein the first proximity sensor (43) is configured to detect an approach of a surface of the first unbalance element (12), and / or wherein the second sensor device (42) has a second proximity sensor (44), wherein the second proximity sensor (44) is configured to detect an approach of a surface of the second unbalance element (22).

10. Shaking table (1) according to one of claims 1 to 9, wherein the first unbalance element (12) and / or the second unbalance element (22) are designed in the shape of a circular segment.

11. Shaking table (1) according to one of claims 1 to 10, wherein the first unbalance unit (10) has at least one first unbalance change element (51), wherein the at least one first unbalance change element (51) is detachably connected to the first drive shaft (11), and / or wherein the second unbalance unit (20) has at least one second unbalance change element, wherein the at least one second unbalance change element is detachably connected to the second drive shaft (21).

12. Shaking table (1) according to one of claims 1 to 11, wherein the shaking device (9) has a control device (60), wherein the control device (60) is configured to control the first drive (13) and the second drive (23) such that the first drive shaft (11) rotates at a first speed in a first direction of rotation about the common axis of rotation (D) and the second drive shaft (23) rotates independently of the first drive shaft (13) at a second speed in a second direction of rotation about the common axis of rotation (D).

13. Shaking table (1) according to claim 12, wherein the control device (60) is configured to control the first drive (13) and the second drive (23) such that the first rotational speed and the second rotational speed are different and / or the first direction of rotation and the second direction of rotation are opposite.

14. Shaking table (1) according to claim 12 or 13, wherein the control device (60) is configured to control the first drive (13) such that during a shaking process the first rotational speed of the first drive shaft (13) is periodically varied with a first period between a first minimum value and a first maximum value, and / or to control the second drive (23) such that during a shaking process the second rotational speed of the second drive shaft (23) is periodically varied with a second period between a second minimum value and a second maximum value.

15. Method for operating a vibrating table (1) according to one of claims 1 to 14, wherein during a vibrating process a first rotational speed of the first drive shaft (13) is periodically varied with a first period between a first minimum value and a first maximum value and / or a second rotational speed of the second drive shaft (23) is periodically varied with a second period between a second minimum value and a second maximum value.

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