Apparatus for analyzing the surface of stones and system for producing stones

Abstract

The present invention discloses an apparatus (1) for analyzing the surface of at least one stone (S), the apparatus (1) having a transport support (10) for supporting at least one stone (S) and for transporting the same in a transport direction (T), at least one 3D surface scanner (20) which is configured to determine a topography of at least one surface (SO) of the stone (S), at least one white-light line illumination device (31, 32) for emitting linear white light towards the transport support (10), an RGB camera (50) for detecting light which has been emitted by the white-light line illumination device (31, 32) and has been reflected by the at least one surface (SO) of the at least one stone (S), and a control device (60) which is data-coupled to the at least one 3D surface scanner (20) and to the RGB camera (50), wherein the control device (60) is designed to receive topography data representing the topography of the at least one surface (SO) of the at least one stone (S) from the 3D surface scanner (20) and to receive reflection data representing the reflective capability of the at least one surface (SO) of the stone (S) from the RGB camera (50) and to determine a height difference of the topography of the at least one surface (SO) of the at least one stone (S) on the basis of the topography data and to output an error signal if the height difference is greater than a maximum height difference, and to determine a reflectivity of the at least one surface (SO) of the stone (S) on the basis of the reflection data and to output an error signal if the reflectivity is outside a predefined reflectivity range.

Description

[0001] Device for surface analysis of stones and system for producing stones

[0002] The present invention relates to a device for surface analysis of stones. Furthermore, the present invention relates to a system for producing stones.

[0003] During the production of stones, especially concrete stones such as paving stones, hollow blocks, curbs, edging stones, and the like, the stones may contain defects. These defects can include cracks, segregation, broken edges, or even discoloration of the stone's surface.

[0004] Quality assurance of concrete blocks produced using a block machine, for example, has so far been carried out primarily by humans, who subjectively assess whether the produced blocks meet quality requirements. If a defective block is identified, it is manually removed from a conveyor belt.

[0005] The present invention is based on the object of providing a device for the surface analysis of at least one concrete block, which enables objective, rapid, and more precise quality assurance of manufactured blocks, in particular concrete blocks. This object underlying the present invention is achieved by a device for the surface analysis of at least one block having the features of claim 1. Advantageous embodiments of the device are described in the claims dependent on claim 1.

[0006] More specifically, the object underlying the present invention is achieved by a device for the surface analysis of at least one stone, wherein the device has a transport support for placing and transporting at least one stone in a transport direction, wherein the transport support extends in the transport direction and in a transverse direction. The device further has at least one 3D surface scanner which is designed to determine a topography of at least one surface of the stone, wherein the 3D surface scanner is spaced from the transport support in a vertical direction perpendicular to the transport direction and to the transverse direction.The device further comprises at least one white light linear illumination device for emitting linear white light in the direction of the transport support, wherein a longitudinal extent of the linear white light is oriented substantially parallel to the transverse direction of the transport support, and wherein the white light linear illumination device is spaced apart from the transport support in the vertical direction. The device further comprises an RGB camera for detecting light emitted by the white light linear illumination device and reflected by the at least one surface of the at least one stone, wherein the RGB camera is spaced apart from the transport support in the vertical direction and is arranged at a distance from the 3D area scanner in the transport direction.The device has a control device which is data-coupled to the at least one 3D surface scanner and to the RGB camera, wherein the control device is designed to receive topography data representing the topography of the at least one surface of the at least one stone from the 3D surface scanner and reflection data representing the reflectivity of the at least one surface of the stone from the RGB camera, and to determine a height difference of the topography of the at least one surface of the at least one stone based on the topography data and to output an error signal if the height difference is greater than a maximum height difference, and to determine a reflectivity of the at least one surface of the stone based on the reflection data and to output an error signal if the reflectivity is outside a predetermined reflectivity range.

[0007] The device according to the invention enables objective, rapid, and more precise quality assurance of manufactured stones, in particular concrete blocks. The device according to the invention enables the determination of a topography of the surface of at least one stone and also the determination of a color or color gradient of the surface of at least one stone. Thus, structural defects and color defects in the stone surface can be reliably detected.

[0008] The surface of the at least one stone comprises, for example, a cover surface and / or one or more side surfaces and / or edges of the at least one stone.

[0009] The transport support can be designed as a conveyor belt or conveyor belt. The transport support is driven by a drive device. The transport direction and the transverse direction preferably span a plane which is aligned horizontally in the installed position of the device. The transport support can be part of a stone machine. Preferably, the transport support is designed to receive a plurality of stones which can further preferably be positioned in several ordered rows on the transport support. The 3D area scanner can be designed to emit a structured light pattern in the direction of the transport support. Based on the light pattern on the surface of the at least one stone determined by the 3D area scanner, the topography of the stone can be determined since the emitted light pattern is known.

[0010] The topography of a stone surface refers to its surface structure. The device is preferably designed such that it can determine the surface structure of a stone with an accuracy of up to 0.1 mm.

[0011] The at least one white light line lighting device is preferably designed as an LED white light line lighting device which has a plurality of white light emitting LEDs which are arranged along a longitudinal extent of the white light line lighting device.

[0012] The RGB camera has a CCD sensor. The CCD sensor is preferably designed as a CCD line sensor.

[0013] The control device is designed as an electronic control device. The control device is designed to receive data from the 3D area scanner and / or the RGB camera and / or to transmit data, in particular control signals, to these data. Furthermore, the control device is preferably data-coupled to the at least one white-light line illumination device for transmitting control signals.

[0014] The reflectivity or reflectivity of at least one surface is determined based on the known color and

[0015] Beam characteristics of the at least one white light line illumination device and the reflection data received from the RGB camera are calculated.

[0016] The device is preferably designed such that it has a first white light linear illumination device and a second white light linear illumination device, which are each signal-coupled to the control device, wherein the first white light linear illumination device and the second white light linear illumination device have a first horizontal distance from one another in the transport direction. In this case, a first radiation direction of the first white light linear illumination device forms a first angle with the vertical direction, and a second radiation direction of the second white light linear illumination device forms a second angle with the vertical direction.The first horizontal distance, the first angle and the second angle are set such that the first linear white light emitted by the first white light linear illumination device and the second linear white light emitted by the second white light linear illumination device coincide on a surface of the stone.

[0017] The appropriately designed device enables an even more precise determination of the reflectivity of at least one surface of the stone. Because the linear white light radiated onto the surface of the stone at the first and second angles allows shadows caused by the topography of the stone surface to be eliminated, false error signals are thus avoided.

[0018] Preferably, the magnitudes of the first angle and the second angle are equal. For example, the first angle is 35° and the second angle is -35°. Preferably, the magnitudes of the first angle and the second angle are between 20° and 60°, more preferably between 25° and 50°, and even more preferably between 30° and 40°.

[0019] Further preferably, the first white-light linear illumination device and the second white-light linear illumination device are at the same vertical distance from the transport support. Further preferably, the first white-light linear illumination device and the second white-light linear illumination device are arranged symmetrically to one another with respect to a plane of symmetry spanned by the vertical and transverse directions.

[0020] Preferably, a distance of the RGB camera from the transport support running parallel to the vertical direction is greater than a distance of the first white light line illumination device and / or the second white light line illumination device from the transport support running parallel to the vertical direction.

[0021] Further preferably, a distance of the RGB camera to the transport support running parallel to the vertical direction is between 500 mm and 1500 mm, further preferably between 700 mm and 1200 mm and even more preferably between 800 mm and 1000 mm.

[0022] Further preferably, a distance of the first white light line illumination device and / or the second white light line illumination device from the transport support, running parallel to the vertical direction, is between 150 mm and 500 mm, further preferably between 150 mm and 400 mm and even more preferably between 150 mm and 300 mm.

[0023] Preferably, a distance between the first white light line illumination device and the second white light line illumination device, running parallel to the transport direction, is between 100 mm and 500 mm, more preferably between 150 mm and 400 mm, and even more preferably between 200 mm and 300 mm.

[0024] Further preferably, the device is designed such that the RGB camera is arranged in the transport direction between the first white light line illumination device and the second white light line illumination device.

[0025] A suitably designed device has the advantage of being compact. This is because the space between the first white-light linear illumination device and the second white-light linear illumination device is used by the RGB camera. Furthermore, a corresponding arrangement of the RGB camera with respect to the first and second white-light linear illumination devices enables an even more precise determination of the reflectivity of at least one surface of the stone, since incorrect determinations of the reflectivity due to misinterpretation of topography-related shadows are reduced. This avoids false error signals.

[0026] Further preferably, the RGB camera has the same distance in the transport direction from the first white light line illumination device and from the second white light line illumination device.

[0027] Further preferably, in the device, the RGB camera is designed as an RGB line sensor, wherein a line sensor longitudinal extension of the RGB line sensor runs parallel to the first linear white light and to the second linear white light, and wherein the RGB line sensor is arranged between the first white light line illumination device and the second white light line illumination device and is aligned such that the surface of the stone, which is irradiated by the first linear white light and / or by the second linear white light, can be optically detected by means of the RGB line sensor.

[0028] The correspondingly designed device enables the determination of the reflectivity of at least one surface of the at least one stone at an increased transport speed of the stone through the transport support. Because the reduced number of pixels to be read from the RGB line sensor allows the corresponding data to be processed electronically more quickly.

[0029] Further preferably, the device is designed such that the first white light line illumination device and / or the second white light line illumination device are mounted at a variable distance from the transport support.

[0030] The correspondingly designed device has the advantage that stones with different heights can be analyzed. Because of the variable-distance mounting of the first white-light linear illumination device and / or the second white-light linear illumination device, they can always be positioned with respect to the transport support in such a way that a line focus of the first white-light linear illumination device and / or the second white-light linear illumination device always lies on the at least one surface of the at least one stone.

[0031] Further preferably, the control device in the device is designed to activate the first white-light linear illumination device and the second white-light linear illumination device at different times by transmitting control signals. The correspondingly designed device enables an even more precise determination of the reflectivity of at least one surface of the stone. This is because the linear white light radiated onto the surface of the stone at the first angle and at the second angle allows shadows caused by the topography of the stone surface to be calculated out. This avoids false error signals.

[0032] Preferably, in the device, the control device is designed to receive first reflection data representing the reflectivity of the at least one surface of the stone from the RGB camera for light in a red wavelength range, and to determine a first reflectivity of the at least one surface of the stone in the red wavelength range based on the first reflection data and to output an error signal if the first reflectivity is outside a predetermined first reflectivity range.Alternatively or additionally, the control device is designed to receive second reflection data representing the reflectivity of the at least one surface of the stone from the RGB camera for light in a green wavelength range, and to determine a second reflectivity of the at least one surface of the stone in the green wavelength range based on the second reflection data and to output an error signal if the second reflectivity is outside a predetermined second reflectivity range.Alternatively or additionally, the control device is designed to receive the third reflection data representing the reflectivity of the at least one surface of the stone from the RGB camera for light in a blue wavelength range, and based on the third reflection data, to determine a third reflectivity of the at least one surface of the stone in the blue wavelength range and to output an error signal if the third reflectivity is outside a predetermined third reflectivity range. The correspondingly designed device enables a more precise determination of a color or a color gradient of the surface of the at least one stone. Color defects in the stone surface can thus be determined even more reliably.

[0033] Preferably, in the device, the 3D surface scanner is designed to emit a structured light pattern in the direction of the transport support, to detect the at least one surface of the at least one stone illuminated with the structured light pattern, and to calculate the topography data of the at least one surface of the at least one stone based on the detected image data.

[0034] The correspondingly designed device enables a rapid and highly precise determination of the topography of the surface of at least one stone. Thus, the correspondingly designed device enables a reliable determination of the topography of the stone surface, even at high transport speeds of the transport support and thus of the at least one stone or the majority of stones.

[0035] The device is preferably designed in such a way that it can determine the surface structure of a stone with an accuracy of up to 0.1 mm.

[0036] Preferably, the device has at least two 3D surface scanners, each of which optically detects a surface area of ​​the transport support, wherein the respective surface areas are adjacent to one another and / or partially overlap.

[0037] Using the appropriately designed device, larger surface areas of the transport support can be optically scanned. Thus, the appropriately designed device enables an increased throughput of stones to be analyzed. The device is preferably designed such that it has a light absorption device arranged in the transport direction between the at least one 3D surface scanner and the RGB camera and extending vertically, preferably up to the transport support.

[0038] The correspondingly designed device exhibits improved accuracy in determining the topography of the surface of the at least one stone and in determining a color or color gradient of the surface of the at least one stone, since the light emitted by the at least one white-light linear illumination device is not detected by the 3D surface scanner, and since the light emitted by the 3D surface scanner is not detected by the RGB camera. Thus, structural defects and color defects in the stone surface can be detected even more reliably.

[0039] The light absorption device is preferably designed as a light-tight curtain.

[0040] Preferably, in the device, the control device is designed to correct the reflectivity of the at least one surface of the at least one stone taking into account the topography data.

[0041] The correspondingly designed device enables a more precise determination of a color or a color gradient of the surface of the at least one stone. Color defects in the stone surface can therefore be determined even more reliably. This is because by taking into account the determined topography of the surface of the at least one stone, shadows caused by irradiation of the surface by means of the at least one white light line illumination device can be identified or anticipated. Preferably, the transport support in the device is designed such that a plurality of stones can be placed on it and transported in the transport direction, wherein the control device is designed, when at least one error signal is output, to identify the at least one stone for which the error signal was output.

[0042] The appropriately designed device enables even faster quality assurance of manufactured blocks, especially concrete blocks. Furthermore, sorting work, which may be performed by a device operator, is considerably simplified.

[0043] Further preferably, the device comprises a display device for displaying the at least one identified defective stone.

[0044] The appropriately designed device enables even faster quality assurance of manufactured blocks, especially concrete blocks. Furthermore, sorting work, which may be performed by a device operator, is considerably simplified.

[0045] The display device is preferably designed as a monitor. Furthermore, it is possible for the display device to project an optical signal (illumination) onto the defective stone, thus further simplifying the sorting process.

[0046] Further preferably, the device comprises a removal device for removing the at least one identified defective stone. The correspondingly designed device has an increased degree of automation, so that the device has an increased throughput of stones to be analyzed.

[0047] The removal device is preferably designed as a robot which removes the stones identified as faulty from the transport support by means of a gripper.

[0048] The object underlying the present invention is further achieved by a system for producing stones, in particular concrete stones, having the features of claim 15.

[0049] More specifically, the object underlying the present invention is achieved by a system for producing blocks, in particular concrete blocks, which system comprises a block machine for producing blocks and a first device for surface analysis as described above, wherein the first device is arranged on a wet side of the system. The system further comprises a second device for surface analysis as described above, wherein the second device is arranged on a dry side of the system.

[0050] The wet side of the system is preferably located directly downstream of the block machine so that the still wet or moist blocks can be analyzed using the first device for surface analysis. The dry side of the system is an area of ​​the system in which the blocks are in dried form. For example, the moist blocks are fed to a storage and / or drying device. The dry side of the system is then located downstream of the storage and / or drying device in the direction of transport of the blocks. The dry blocks can therefore be analyzed using the second device for surface analysis. The appropriately designed system has even better reliability in surface analysis because the surfaces of the blocks can change again during the drying process.

[0051] Further advantages, details and features of the invention will become apparent from the following exemplary embodiments. These show in detail:

[0052] Figure 1: a schematic cross-sectional view of a device according to the invention for surface analysis of at least one stone;

[0053] Figure 2: a schematic plan view of the device shown in Figure 1 for the surface analysis of at least one stone; and

[0054] Figure 3: a schematic and highly simplified representation of a system according to the invention for producing stones.

[0055] In the following description, identical reference symbols designate identical components or identical features, so that a description given with respect to one figure regarding a component also applies to the other figures, thus avoiding repetitive description. Furthermore, individual features described in connection with one embodiment can also be used separately in other embodiments. Furthermore, the methods according to the first to seventh embodiments can also be combined with one another.

[0056] Figure 1 shows a device 1 for the surface analysis of at least one stone S in a cross-sectional view. Figure 2 shows the device 1 shown in Figure 1 in a plan view of a transport support 10 of the device 1. The transport support 10 is designed to place and transport a plurality of stones S in a transport direction T. As can be seen from Figures 1 and 2, the transport support 10 extends in the transport direction T and in a transverse direction Q.

[0057] The device 1 further comprises at least one 3D surface scanner 20. For reasons of clarity, only a single 3D surface scanner 20 is shown in Figure 1, whereas three 3D surface scanners 20 of the device 1 are shown in Figure 1. The 3D surface scanners 20 are designed to determine a topography of the surfaces SO of the stones S. As can be seen in particular from Figure 1, the 3D surface scanners 20 are spaced from the transport support 10 in a vertical direction V, which is oriented perpendicular to the transport direction T and the transverse direction Q.

[0058] As can be seen in particular from Figure 2, the respective 3D area scanners 20 are designed to optically capture a respective surface area 11, 12, 13 of the transport support 10. In the illustrated embodiment, a first surface area 11 is adjacent to a second surface area 12, wherein the first surface area 11 and the second surface area 12 partially overlap. A third surface area 13 is arranged adjacent to the second surface area 12 and also partially overlaps with the second surface area 12.

[0059] Furthermore, the device 1 has at least one white light linear illumination device 31, 32 for emitting linear white light in the direction of the transport support 10. In the illustrated embodiment, the device 1 has a first white light linear illumination device 31 and a second white light linear illumination device 32, which are only shown in Figure 1, but not in Figure 2. It can be seen that the first white light linear illumination device 31 and the second white light linear illumination device 32 have a first horizontal distance D from one another in the transport direction T.

[0060] The white light linear illumination devices 31, 32 are arranged and aligned such that a first radiation direction 41 of the first white light linear illumination device 31 encloses a first angle α1 with the vertical direction V, and that a second radiation direction 42 of the second white light linear illumination device 32 encloses a second angle α2 with the vertical direction V. The first horizontal distance D, the first angle α1 and the second angle α2 are set such that the first linear white light emitted by the first white light linear illumination device 31 and the second linear white light emitted by the second white light linear illumination device 32 coincide on a surface SO of a stone S. The respective longitudinal extent L of the linear white light runs essentially parallel to the transverse direction Q of the transport support 10.The white light line illumination devices 31, 32 are spaced apart in the vertical direction V from the transport support 10.

[0061] In order that the device 1 can be used for stones S with different heights, the first white light line illumination device 31 and the second white light line illumination device 32 are mounted at a variable distance from the transport support 10.

[0062] The device 1 further comprises an RGB camera 50 for detecting light emitted by the white-light line illumination devices 31, 32 and reflected by the surface SO of a stone S. The RGB camera 50, which in the illustrated embodiment is designed as an RGB line sensor 50, is spaced apart in the vertical direction V from the transport support 10. Furthermore, the RGB camera 50 is spaced apart in the transport direction T from the 3D area scanner.

[0063] From Figure 1 it can be seen that the device 1 further comprises a control device 60, which is not shown in Figure 2. The control device 60 is data-coupled to the 3D area scanners 20 and to the RGB camera 50. Furthermore, the control device is signal-coupled to the first white-light line illumination device 31 and to the second white-light line illumination device 32. The control device 60 can be designed to activate the first white-light line illumination device 31 and the second white-light line illumination device 32 at different times by transmitting control signals.

[0064] As already described above, in the illustrated embodiment, the RGB camera 50 is designed as an RGB line sensor 50. In this case, a line sensor longitudinal extension of the RGB line sensor 50 runs parallel to the first linear white light emitted by the first white light line illumination device 31 and to the second linear white light emitted by the second white light line illumination device 32. The RGB line sensor 50 is arranged in the transport direction T between the first white light line illumination device 31 and the second white light line illumination device 32 and is aligned such that the surface SO of the stone S, which is irradiated by the first linear white light and / or by the second linear white light, is detected by means of the RGB

[0065] Line sensor 50 is optically detectable. The control device 60 is designed to receive topography data representing the topography of the surfaces SO of the stones S from the 3D area scanner 20. Furthermore, the control device 60 is designed to receive reflection data representing the reflectivity of the surfaces SO of the stones S from the RGB camera 50. Based on the topography data, a height difference of the topography of the surfaces SO is determined for each stone S and an error signal is output if the height difference is greater than a maximum height difference. Furthermore, based on the reflection data, a reflectivity of the respective surfaces SO of the stones S is determined and an error signal is output if the reflectivity is outside a predetermined reflectivity range.

[0066] In the embodiment of the device 1 shown in Figure 1, the device has a display device 80. The control device 60 is designed, upon output of an error signal, to identify the at least one stone S for which the error signal was generated and / or output. The stone S identified as faulty is displayed on or by means of the display device 80.

[0067] As can be seen from Figure 1, the device 1 further comprises a light absorption device 70, which can be designed, for example, as an opaque plate or curtain. The light absorption device 70 is arranged in the transport direction T between the 3D area scanner 20 and the RGB camera 50 and extends in the vertical direction V. The light absorption device 70 absorbs light generated by the first and second white light line illumination devices 31, 32 and reflected by the surfaces SO of the stones S in the direction of the 3D area scanner 20. Furthermore, the light absorption device 70 absorbs light generated by the 3D area scanners 20 and reflected by the surfaces SO of the stones S in the direction of the RGB camera.

[0068] Figure 3 shows a system 100 for producing stones S. The system S has a stone machine 110 for producing stones S. The system also has a first device 1 shown in Figures 1 and 2 and a second device 1 shown in Figures 1 and 2. The first device 1 is arranged on a wet side 120 of the system 100. In the embodiment shown, the wet side 120 is arranged in the transport direction T of the transport support 10 between the stone machine 110 and a storage 140. The storage 140 can be designed, for example, as a storage shelving system with several storage racks 140. The storage racks 140 can be designed to be movable and can preferably be fed to a drying device, for example a kiln for drying the stones S. The second device 1 is arranged on a dry side 130 of the system 100.The dry side 130 of the system 100 is a region of the system 100 in which the stones S are in dried form.

[0069] List of reference symbols

[0070] I Device for surface analysis

[0071] 10 Transport support

[0072] II first area (the transport support)

[0073] 12 second surface area (the transport support)

[0074] 13 third surface area (the transport support)

[0075] 20 3D area scanners

[0076] 31 first white light line lighting device

[0077] 32 second beam direction (of the second white light line lighting device)

[0078] 41 first beam direction (of the first white light line lighting device)

[0079] 42 second white light line lighting device

[0080] 50 RGB camera / RGB line sensor

[0081] 60 Control device

[0082] 70 Light absorption device

[0083] 80 Display device / monitor

[0084] 100 Stone Crafting System

[0085] 110 Stone machine

[0086] 120 wet side (of the stone machine)

[0087] 130 Dry side (of the stone machine)

[0088] 140 Storage of the system for making stones

[0089] D Horizontal distance (between first and second white light line illumination device)

[0090] L Longitudinal extension of the linear white light

[0091] Q transverse direction

[0092] S Stein

[0093] SO surface of the stone

[0094] T Transport direction

[0095] V Vertical direction

[0096] ZL Line sensor longitudinal extension al first angle a2 second angle

Claims

Patent claims 1. Device (1) for the surface analysis of at least one stone (S), the device (1) having the following features: a transport support (10) for placing and transporting at least one stone (S) in a transport direction (T), the transport support (10) extending in the transport direction (T) and in a transverse direction (Q); at least one 3D surface scanner (20) which is designed to determine a topography of at least one surface (SO) of the stone (S), the 3D surface scanner (20) being spaced from the transport support (10) in a vertical direction (V) perpendicular to the transport direction (T) and to the transverse direction (Q);at least one white light linear illumination device (31, 32) for emitting linear white light in the direction of the transport support (10), wherein a longitudinal extent (L) of the linear white light is oriented substantially parallel to the transverse direction (Q) of the transport support (10), and wherein the white light linear illumination device (31, 32) is spaced apart in the vertical direction (V) from the transport support (10); an RGB camera (50) for detecting light emitted by the white light linear illumination device (31, 32) and reflected by the at least one surface (SO) of the at least one stone (S), wherein the RGB camera (50) is spaced apart in the vertical direction (V) from the transport support (10) and in; Transport direction (T) is arranged at a distance from the 3D area scanner (20);and a control device (60) which is data-coupled to the at least one 3D surface scanner (20) and to the RGB camera (50), wherein the control device (60) is designed to receive topography data representing the topography of the at least one surface (SO) of the at least one stone (S) from the 3D surface scanner (20) and reflection data representing the reflectivity of the at least one surface (SO) of the stone (S) from the RGB camera (50), and to determine a height difference of the topography of the at least one surface (SO) of the at least one stone (S) based on the topography data and to output an error signal if the height difference is greater than a maximum height difference, and to determine a reflectivity of the at least one surface (SO) of the stone (S) based on the reflection data and to output an error signal if the reflectivity is outside a predetermined reflectivity range.

2. Device (1) according to claim 1, characterized by the following features: the device (1) has a first white light line illumination device (31) and a second white light line illumination device (32), each of which is signal-coupled to the control device (60); the first white light linear illumination device (31) and the second white light linear illumination device (32) are at a first horizontal distance (D) from one another in the transport direction (T); a first emission direction (41) of the first white light linear illumination device (31) forms a first angle (α1) with the vertical direction (V), and a second emission direction (42) of the second white light linear illumination device (32) forms a second angle (α2) with the vertical direction (V); and the first horizontal distance (D), the first angle (α1), and the second angle (α2) are set such that the first linear white light emitted by the first white light linear illumination device (31) and the second linear white light emitted by the second white light linear illumination device (32) coincide on a surface (SO) of the stone (S).

3. Device (1) according to claim 2, characterized in that the RGB camera (50) is arranged in the transport direction (T) between the first white light line illumination device (31) and the second white light line illumination device (32).

4. Device (1) according to one of claims 2 or 3, characterized by the following features: the RGB camera (50) is designed as an RGB line sensor (50); a line sensor longitudinal extension of the RGB line sensor (50) runs parallel to the first linear white light and to the second linear white light; the RGB line sensor (50) is arranged between the first white light line illumination device (31) and the second white light line illumination device (32) and is aligned such that the surface (SO) of the stone (S) which is irradiated by the first line-shaped white light and / or by the second line-shaped white light can be optically detected by means of the RGB line sensor (50).

5. Device according to one of claims 2 to 4, characterized in that the first white light line illumination device (31) and / or the second white light line illumination device (32) are mounted at a variable distance from the transport support (10).

6. Device according to one of claims 2 to 5, characterized in that the control device (60) is designed to activate the first white light line illumination device (31) and the second white light line illumination device (32) at different times by transmitting control signals.

7. Device according to one of the preceding claims, characterized in that the control device (60) is designed to receive first reflection data representing the reflectivity of the at least one surface (SO) of the stone (S) from the RGB camera (50) for light in a red wavelength range, and based on the first reflection data, to determine a first reflectivity of the at least one surface (SO) of the stone (S) in the red wavelength range and to output an error signal if the first reflectivity is outside a predetermined first reflectivity range; and / or to receive second reflection data representing the reflectivity of the at least one surface (SO) of the stone (S) from the RGB camera (50) for light in a green wavelength range, and to determine a second reflectivity of the at least one surface (SO) of the stone (S) in the green wavelength range based on the second reflection data and to output an error signal if the second reflectivity is outside a predetermined second reflectivity range;and / or to receive third reflection data representing the reflectivity of the at least one surface (SO) of the stone (S) from the RGB camera (50) for light in a blue wavelength range, and to determine a third reflectivity of the at least one surface (SO) of the stone (S) in the blue wavelength range based on the third reflection data and to output an error signal if the third reflectivity is outside a predetermined third reflectivity range; 8. Device according to one of the preceding claims, characterized in that the 3D surface scanner (20) is designed to emit a structured light pattern in the direction of the transport support (10), to detect the at least one surface (SO) of the at least one stone (S) illuminated with the structured light pattern, and to calculate the topography data of the at least one surface (SO) of the at least one stone (S) based on the detected image data.

9. Device according to one of the preceding claims, characterized by the following features: The device comprises at least two 3D surface scanners (20), each of which optically captures a surface area (11, 12, 13) of the transport support (10); and the respective surface areas (11, 12, 13) are adjacent to one another and / or partially overlap.

10. Device (1) according to one of the preceding claims, characterized in that the device (1) has a light absorption device (70) which is arranged in the transport direction (T) between the at least one 3D area scanner (20) and the RGB camera (50) and is located in vertical direction (V), preferably up to the transport support (10).

11. Device (1) according to one of the preceding claims, characterized in that the control device (60) is designed to correct the reflectivity of the at least one surface (SO) of the at least one stone (S) taking into account the topography data.

12. Device (1) according to one of the preceding claims, characterized by the following features: the transport support (10) is designed such that a plurality of stones (S) can be placed thereon and transported in the transport direction (T); the control device (60) is designed to identify, upon the output of at least one error signal, the at least one stone (S) for which the error signal was output.

13. Device (1) according to claim 12, characterized in that the device (1) comprises a display device (80) for Displaying at least one identified faulty Stone (S).

14. Device (1) according to claim 12 or 13, characterized in that the device (1) has a removal device for removing the at least one identified defective stone (S).

15. A system (100) for producing stones (S), comprising a stone machine (110) for producing stones (S); a first device (1) for surface analysis according to one of claims 1 to 14, wherein the first device (1) is arranged on a wet side (120) of the system (100); and a second device (1) for surface analysis according to one of claims 1 to 14, wherein the second device (1) is arranged on a dry side (130) of the system (100).

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