Flower basket deformation conveying detection device

Abstract

This utility model belongs to the field of flower basket inspection technology, specifically relating to a flower basket deformation conveying and inspection device. It includes a frame, a vision inspection mechanism, a conveying mechanism, and a lifting and advancing mechanism. The frame has multiple workstations; the vision inspection mechanism is positioned above the inspection stations; the conveying mechanism is positioned outside the inspection stations with its conveying direction along the y-axis; and the lifting and advancing mechanism is positioned below the worktable, driving the flower baskets to move sequentially from the loading station to the conveying station along the x-axis. This utility model effectively solves the problem of insufficient buffer space on the inspection table in existing technologies by setting multiple workstations for placing flower baskets, reducing the risk of material blockage. The lifting and advancing mechanism automatically advances the flower baskets from the loading station to the conveying station, eliminating the need for manual handling. The coordinated arrangement of the vision inspection mechanism and the conveying mechanism accurately detects the quality of the flower baskets and conveys them in different directions based on the inspection results, improving production line flexibility.

Description

Technical Field

[0001] This utility model relates to the field of flower basket detection technology, and in particular to a flower basket deformation conveying detection device. Background Technology

[0002] The photovoltaic industry primarily refers to the photoelectric conversion industry based on the application and development of silicon materials. Silicon wafers are obtained by cutting monocrystalline silicon after crystal pulling, and they occupy a core position in the entire industry; all equipment is designed around silicon wafer processing. The wafer carrier—the basket—is crucial to the entire silicon wafer processing flow. Specifically, silicon wafers are initially cut from silicon rods, at which point the wafer surface is often covered with silicon powder and epoxy resin residue. Therefore, the production process requires cleaning the cut wafers. During cleaning, the wafers are placed uniformly in baskets and transported using robotic arms and other equipment. The quality of the baskets directly or indirectly affects the wafer breakage rate; therefore, basket quality inspection is particularly important. The basket deformation conveying detection device is designed to screen out deformed baskets, thereby reducing the wafer breakage rate caused by basket damage.

[0003] In existing technologies, the flower basket deformation conveying and detection device mainly consists of a vision inspection mechanism and an inspection table. A robotic arm places the flower basket to be inspected on the inspection table, and a camera scans and inspects the basket. However, the current inspection table only has one buffer position, which significantly affects the overall cleaning rhythm of the flower baskets. Furthermore, qualified flower baskets after inspection need to be manually moved to the return line, while damaged flower baskets can only be placed on the platform awaiting manual handling. Although this method can indeed remove damaged flower baskets and ensure the silicon wafer breakage rate, it also increases labor input and working time. More importantly, there are safety hazards during manual handling, which may lead to personnel injury. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the technical problems in the prior art where insufficient buffer space of the detection table affects the cleaning rhythm and the need for manual handling of flower baskets after detection, which increases labor, working time and safety hazards, this utility model provides a flower basket deformation conveying detection device, which reduces the risk of material blockage through multiple workstations, realizes automatic progressive and classified conveying of flower baskets, and reduces manual handling, saving time and cost.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a flower basket deformation conveying and detection device, which includes: a frame, the frame including a worktable, a plurality of workstations for placing flower baskets are arranged sequentially along the x-axis direction on the worktable, the workstation at the first end of the worktable is the loading position, the workstation at the last end of the worktable is the detection position, and the workstation between the loading position and the detection position is the buffer position;

[0006] A visual inspection mechanism is disposed above the inspection position and is used to inspect the quality of the flower basket;

[0007] A conveying mechanism is provided outside the detection position, and a conveying position is provided on the conveying mechanism, the conveying position being set along the y-axis direction;

[0008] A lifting and advancing mechanism is provided below the worktable. The lifting and advancing mechanism includes a lifting component and an advancing component. The upper end of the lifting component is connected to the flower basket and is used to drive the flower basket to move along the z-axis. The output end of the advancing component is connected to the lifting component and is used to drive the lifting component to move along the x-axis.

[0009] The lifting and advancing mechanism drives the flower basket to move sequentially from the loading position to the conveying position along the x-axis.

[0010] The specific technical effects are as follows: By setting up multiple workstations for placing flower baskets (including loading station, buffer station, and inspection station), the problem of insufficient buffer station on the inspection table in the existing technology is effectively solved, reducing the risk of material blockage; by setting up a lifting and advancing mechanism, the flower baskets can be automatically advanced from the loading station to the conveying station without manual handling; through the coordinated setting of the vision inspection mechanism and the conveying mechanism, the quality of the flower baskets can be accurately detected, and the flower baskets can be conveyed to different directions according to the inspection results, improving the flexibility and adaptability of the overall production line.

[0011] Furthermore, the advancing component includes an advancing cylinder, a guide rail, and a slider mounting plate. The guide rail extends along the x-axis, the slider mounting plate is slidably mounted on the guide rail, the lifting component is mounted on the slider mounting plate, and the output end of the advancing cylinder is connected to the lifting component.

[0012] Furthermore, the lifting assembly includes a lifting cylinder, a lifting frame, a guide shaft, and a linear bearing. The lifting cylinder is disposed below the slider mounting plate. The output end of the lifting cylinder passes through the slider mounting plate and is connected to the lifting frame. The output end of the advancing cylinder is connected to the lifting cylinder. The guide shaft is mounted on the slider mounting plate and extends along the z-axis. The linear bearing is sleeved on the guide shaft and connected to the lifting frame.

[0013] Furthermore, the lifting frame includes a profile seat, which is mounted on the output end of the lifting cylinder and connected to the linear bearing. Lifting side plates are provided on both sides of the profile seat, and the upper end of the lifting side plate is operably connected to the flower basket.

[0014] Furthermore, the conveying mechanism includes a drive assembly, a drive shaft, a driven shaft, and a conveyor belt. The drive shaft is connected to the output end of the drive assembly, and the drive shaft and the driven shaft are connected by the conveyor belt. The conveying direction of the conveyor belt is set along the y-axis.

[0015] Furthermore, the drive assembly includes a servo motor, a reducer, and a transmission belt. The servo motor is connected to the reducer, one end of the transmission belt is connected to the output end of the reducer, and the other end of the transmission belt is connected to the drive shaft.

[0016] Furthermore, the visual inspection mechanism includes a camera and a light source. The camera is mounted on the frame and located above the inspection position, and the light source is mounted on the frame via a light source fixing plate and located below the camera.

[0017] Furthermore, the light source fixing plate has a waist hole, which is opened along the z-axis direction.

[0018] Furthermore, multiple sensors are sequentially arranged along the x-axis on the workbench, with each sensor facing a specific workstation.

[0019] Furthermore, the conveying position is provided with a group of mutually cooperating through-beam sensors in the diagonal direction.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] (1) By setting up multiple workstations for placing flower baskets (including feeding station, buffer station and detection station), this utility model effectively solves the problem of insufficient buffer station in the detection station in the prior art. The design of multiple workstations enables the flower baskets to be arranged in an orderly manner during the detection process, reducing the risk of material blockage caused by insufficient buffer station, thereby improving the overall cleaning rhythm and production efficiency.

[0022] (2) By setting up a lifting and advancing mechanism, this utility model can automatically advance the flower basket from the loading position to the conveying position without manual handling. This design significantly reduces labor demand, reduces the labor intensity of operators, and improves the automation level of the production process.

[0023] (3) This utility model, through the combination of a visual inspection mechanism and a conveying mechanism, can accurately detect the quality of flower baskets and convey them to different directions according to the inspection results (e.g., qualified products are conveyed to the return line in the forward direction through the conveying mechanism, while unqualified products are conveyed to the waiting station in the reverse direction through the conveying mechanism, waiting for manual processing). This improves the flexibility and adaptability of the overall production line. Furthermore, the flower baskets after inspection are classified and conveyed through the conveying mechanism, which reduces the steps of manually handling the flower baskets. This means reducing the direct contact between personnel and machinery and equipment, and protecting the safety of the operators. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of the flower basket deformation conveying and detection device of this utility model;

[0026] Figure 2 This is a schematic diagram of the frame structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the lifting and advancing mechanism of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the visual inspection mechanism of this utility model;

[0029] Figure 5 This is a schematic diagram of the conveying mechanism of this utility model.

[0030] In the diagram: 1. Frame; 101. Workbench; 102. Loading position; 103. Detection position; 104. Buffer position; 105. Sensor; 106. Through-beam sensor assembly; 107. Sheet metal mounting.

[0031] 2. Visual inspection mechanism; 201. Camera; 202. Light source; 203. Light source mounting plate; 204. Waist hole;

[0032] 3. Conveying mechanism; 301. Drive shaft; 302. Driven shaft; 303. Conveyor belt; 304. Servo motor; 305. Reducer; 306. Transmission belt; 307. Conveying position;

[0033] 4. Lifting and advancing mechanism; 401. Advancing cylinder; 402. Guide rail; 403. Slider mounting plate; 404. Lifting cylinder; 405. Lifting frame; 406. Guide shaft; 407. Linear bearing; 408. Profile seat; 409. Lifting side plate; 410. Protrusion. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figures 1 to 5 The diagram shows a preferred embodiment of the present invention. The flower basket deformation conveying and detection device of this embodiment includes a frame 1, a vision inspection mechanism 2, a conveying mechanism 3, and a lifting and advancing mechanism 4. The frame 1 includes a worktable 101, on which multiple workstations for placing flower baskets are sequentially arranged along the x-axis. The workstation at the beginning of the worktable 101 is the loading position 102, the workstation at the end of the worktable 101 is the detection position 103, and the workstation between the loading position 102 and the detection position 103 is the buffer position 104. The vision inspection mechanism 2 is equipped with... The device is positioned above the detection position 103 and is used to detect the quality of the flower basket. The conveying mechanism 3 is located outside the detection position 103 and has a conveying position 307. The conveying direction of the conveying position 307 is set along the y-axis. The lifting and advancing mechanism 4 is located below the worktable 101. The lifting and advancing mechanism 4 includes a lifting component and an advancing component. The upper end of the lifting component is connected to the flower basket and is used to drive the flower basket to move along the z-axis. The output end of the advancing component is connected to the lifting component and is used to drive the lifting component to move along the x-axis.

[0038] Among them, the lifting and advancing mechanism 4 drives the flower basket to move sequentially from the loading position 102 to the conveying position 307 along the x-axis direction.

[0039] Therefore, by setting up multiple workstations for placing flower baskets (including loading station 102, buffer station 104, and inspection station 103), the problem of insufficient buffer station 104 in the inspection station in the prior art is effectively solved, reducing the risk of material blockage; by setting up the lifting and advancing mechanism 4, the flower basket can be automatically advanced from the loading station 102 to the conveying station 307 without manual handling; by setting up the visual inspection mechanism 2 and the conveying mechanism 3 in cooperation, the quality of the flower basket can be accurately detected, and the flower basket can be conveyed to different directions according to the inspection results, improving the flexibility and adaptability of the overall production line.

[0040] It also includes a main controller connected to the visual inspection mechanism 2, the conveying mechanism 3, the lifting and advancing mechanism 4, the sensor 105, and the through-beam sensor group 106.

[0041] In this embodiment, the progressive component includes a progressive cylinder 401, a guide rail 402, and a slider mounting plate 403. The guide rail 402 extends along the x-axis, the slider mounting plate 403 is slidably mounted on the guide rail 402, the lifting component is mounted on the slider mounting plate 403, and the output end of the progressive cylinder 401 is connected to the lifting component.

[0042] In this embodiment, a limiting block is provided at both ends of the guide rail 402 to prevent the slider mounting plate 403 from derailing.

[0043] In this embodiment, the lifting assembly includes a lifting cylinder 404, a lifting frame 405, a guide shaft 406, and a linear bearing 407. The lifting cylinder 404 is disposed below the slider mounting plate 403. The output end of the lifting cylinder 404 passes through the slider mounting plate 403 and is connected to the lifting frame 405. The output end of the advancing cylinder 401 is connected to the lifting cylinder 404. The guide shaft 406 is mounted on the slider mounting plate 403 and extends along the z-axis. The linear bearing 407 is sleeved on the guide shaft 406 and connected to the lifting frame 405.

[0044] In this embodiment, the lifting frame 405 includes a profile seat 408, which is mounted on the output end of the lifting cylinder 404 and connected to the linear bearing 407. Lifting side plates 409 are provided on both sides of the profile seat 408, and the upper end of the lifting side plate 409 is operably connected to the flower basket.

[0045] In this embodiment, a protrusion 410 for supporting the flower basket is provided on the lifting side plate 409.

[0046] In this embodiment, the conveying mechanism 3 includes a drive assembly, a drive shaft 301, a driven shaft 302, and a conveyor belt 303. The drive shaft 301 is connected to the output end of the drive assembly. The drive shaft 301 and the driven shaft 302 are connected by the conveyor belt 303. The conveying direction of the conveyor belt 303 is set along the y-axis.

[0047] In this embodiment, the drive assembly includes a servo motor 304, a reducer 305, and a drive belt 306. The servo motor 304 is connected to the reducer 305, one end of the drive belt 306 is connected to the output end of the reducer 305, and the other end of the drive belt 306 is connected to the drive shaft 301.

[0048] In this embodiment, the servo motor 304 is a reversible motor. When the servo motor 304 rotates forward, qualified flower baskets are conveyed to the return line via the conveyor belt 303. When the servo motor 304 rotates in reverse, unqualified flower baskets are conveyed to the processing station via the conveyor belt 303. The flower baskets are sorted and conveyed according to their quality, which improves the flexibility of the overall production line and reduces the number of steps for manually handling the flower baskets.

[0049] In this embodiment, the visual inspection mechanism 2 includes a camera 201 and a light source 202. The camera 201 is mounted on the frame 1 and located above the inspection position 103. The light source 202 is mounted on the frame 1 through a light source fixing plate 203 and located below the camera 201.

[0050] In this embodiment, a waist hole 204 is provided on the light source fixing plate 203. The waist hole 204 is opened along the z-axis direction. Thus, the mounting position of the light source fixing plate 203 on the frame 1 can be adjusted by the waist hole 204, thereby adjusting the distance between the light source 202 and the camera 201, and thus playing the role of adjusting the brightness of the light source 202.

[0051] In this embodiment, a plurality of sensors 105 are arranged sequentially along the x-axis on the workbench 101. Each sensor 105 is directly opposite a workstation and is used to detect whether there is a flower basket at each workstation.

[0052] In this embodiment, the conveying position 307 is provided with a pair of cooperating through-beam sensors 106 in the diagonal direction. Preferably, the frame 1 is provided with a mounting sheet metal 107. The through-beam sensor group 106 includes a first through-beam sensor 105 and a second through-beam sensor 105. The first through-beam sensor 105 is located at one corner of the conveying position 307, and the second through-beam sensor 105 is mounted on the mounting sheet metal 107 and located diagonally opposite the first through-beam sensor 105. The first through-beam sensor 105 and the second through-beam sensor 105 cooperate to detect whether there is a detected flower basket on the detection position 103.

[0053] In this embodiment, the workbench 101 has three stations: a loading station 102, a buffer station 104, and a detection station 103. The conveying station 307 is located on the side of the detection station 103 away from the buffer station 104. The profile seat 408 has three sets of lifting side plates 409, each set of lifting side plates 409 facing a basket at one station. Thus, the lifting and advancing mechanism 4 can advance the three baskets to adjacent stations in sequence in one lift. For example, basket number one is set at the loading station 102, basket number two is set at the buffer station 104, and basket number three is set at the detection station 103. The flower baskets are lifted by the lifting cylinder 404, which drives the lifting frame 405 to rise along the z-axis. The protrusions 410 on each set of lifting side plates 409 contact their corresponding flower baskets and support the first, second, and third flower baskets to move upward together until they are separated from the worktable 101. Then, the advancing cylinder 401 pushes the lifting assembly and the first, second, and third flower baskets to move one station distance along the x-axis. The lifting cylinder 404 drives the lifting frame 405 to descend until the flower baskets are placed on the worktable 101. At this time, the first flower basket is located at the buffer position 104, the second flower basket is located at the detection position 103, and the third flower basket is located at the conveying position 307.

[0054] The working process of this embodiment is as follows:

[0055] The six-axis robot places the flower basket to be inspected at the loading position 102. When the sensor 105 at the loading position 102 detects the flower basket, the main controller controls the lifting cylinder 404 to start, driving the lifting frame 405 to rise along the z-axis. The protrusion 410 contacts the flower basket and supports the flower basket to move upward until it is removed from the worktable 101. Then, the advance cylinder 401 starts, pushing the lifting assembly and the flower basket to move along the x-axis. When the flower basket moves from the loading position 102 to the buffer position 104, the lifting cylinder 404 drives the lifting frame 405 to descend until the flower basket is placed in the buffer position 104 of the worktable 101. The advance cylinder 401 drives the lifting assembly to reset. The process of lifting and advancing is repeated until the flower basket is advanced to the detection position 103. The sensor 105 of the detection position 103 detects the flower basket, and the main controller controls the vision inspection mechanism 2 to start the inspection. The flower basket that has been inspected is then advanced to the conveying position 307 through the lifting and advancing mechanism 4. When the through-beam sensor group 106 of the conveying position 307 detects the flower basket, the main controller controls the servo motor 304 to rotate forward and reverse according to the detection result of the flower basket. The qualified flower basket is conveyed forward through the conveyor belt 303 to the return line connected to the flower basket deformation conveying detection device, and the servo motor 304 is reversed. The unqualified flower basket is conveyed in reverse through the conveyor belt 303 to the waiting processing position.

[0056] Compared with the prior art, the beneficial effects of this utility model are:

[0057] (1) By setting up multiple workstations for placing flower baskets (including feeding station 102, buffer station 104 and detection station 103), this utility model effectively solves the problem of insufficient buffer station 104 in the detection station in the prior art. The design of multiple workstations enables the flower baskets to be arranged in an orderly manner during the detection process, reducing the risk of material blockage caused by insufficient buffer station 104, thereby improving the overall cleaning rhythm and production efficiency.

[0058] (2) By setting up a lifting and advancing mechanism 4, this utility model can automatically advance the flower basket from the loading position 102 to the conveying position 307 without manual handling. This design significantly reduces labor demand, reduces the labor intensity of operators, and improves the automation level of the production process.

[0059] (3) The present invention, through the combination of visual inspection mechanism 2 and conveying mechanism 3, can accurately detect the quality of flower baskets and convey them to different directions according to the inspection results (e.g., qualified products are conveyed to the return line in the forward direction through conveying mechanism 3, while unqualified products are conveyed to the waiting station in the reverse direction through conveying mechanism 3, waiting for manual processing). This improves the flexibility and adaptability of the overall production line. Furthermore, the inspected flower baskets are classified and conveyed through conveying mechanism 3, which reduces the steps of manually handling flower baskets, meaning that the direct contact between personnel and machinery is reduced, thus protecting the safety of operators.

[0060] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A flower basket deformation conveying and detection device, characterized in that, include: The frame (1) includes a workbench (101), and multiple workstations for placing flower baskets are arranged sequentially along the x-axis on the workbench (101). The workstation at the first end of the workbench (101) is the loading station (102), the workstation at the end of the workbench (101) is the detection station (103), and the workstation between the loading station (102) and the detection station (103) is the buffer station (104). A visual inspection mechanism (2) is provided above the inspection position (103) and is used to inspect the quality of the flower basket. A conveying mechanism (3) is provided on the outside of the detection position (103). A conveying position (307) is provided on the conveying mechanism (3). The conveying direction of the conveying position (307) is set along the y-axis. A lifting and advancing mechanism (4) is provided below the worktable (101). The lifting and advancing mechanism (4) includes a lifting component and an advancing component. The upper end of the lifting component is connected to the flower basket and is used to drive the flower basket to move along the z-axis. The output end of the advancing component is connected to the lifting component and is used to drive the lifting component to move along the x-axis. The lifting and advancing mechanism (4) drives the flower basket to move sequentially from the loading position (102) to the conveying position (307) along the x-axis.

2. The flower basket deformation conveying and detection device as described in claim 1, characterized in that, The advancing component includes an advancing cylinder (401), a guide rail (402), and a slider mounting plate (403). The guide rail (402) extends along the x-axis, and the slider mounting plate (403) is slidably mounted on the guide rail (402). The lifting component is mounted on the slider mounting plate (403), and the output end of the advancing cylinder (401) is connected to the lifting component.

3. The flower basket deformation conveying and detection device as described in claim 2, characterized in that, The lifting assembly includes a lifting cylinder (404), a lifting frame (405), a guide shaft (406), and a linear bearing (407). The lifting cylinder (404) is located below the slider mounting plate (403). The output end of the lifting cylinder (404) passes through the slider mounting plate (403) and is connected to the lifting frame (405). The output end of the advancing cylinder (401) is connected to the lifting cylinder (404). The guide shaft (406) is mounted on the slider mounting plate (403) and extends along the z-axis. The linear bearing (407) is sleeved on the guide shaft (406) and connected to the lifting frame (405).

4. The flower basket deformation conveying and detection device as described in claim 3, characterized in that, The lifting frame (405) includes a profile seat (408), which is mounted on the output end of the lifting cylinder (404) and connected to the linear bearing (407). Lifting side plates (409) are provided on both sides of the profile seat (408), and the upper end of the lifting side plate (409) is operably connected to the flower basket.

5. The flower basket deformation conveying and detection device as described in claim 1, characterized in that, The conveying mechanism (3) includes a drive assembly, a drive shaft (301), a driven shaft (302), and a conveyor belt (303). The drive shaft (301) is connected to the output end of the drive assembly. The drive shaft (301) and the driven shaft (302) are connected by transmission through the conveyor belt (303). The conveying direction of the conveyor belt (303) is set along the y-axis.

6. The flower basket deformation conveying and detection device as described in claim 5, characterized in that, The drive assembly includes a servo motor (304), a reducer (305), and a drive belt (306). The servo motor (304) is connected to the reducer (305). One end of the drive belt (306) is connected to the output end of the reducer (305), and the other end of the drive belt (306) is connected to the drive shaft (301).

7. The flower basket deformation conveying and detection device as described in claim 1, characterized in that, The visual inspection mechanism (2) includes a camera (201) and a light source (202). The camera (201) is mounted on the frame (1) and located above the inspection position (103). The light source (202) is mounted on the frame (1) via a light source fixing plate (203) and located below the camera (201).

8. The flower basket deformation conveying and detection device as described in claim 7, characterized in that, The light source fixing plate (203) has a waist hole (204) which is opened along the z-axis.

9. The flower basket deformation conveying and detection device as described in claim 1, characterized in that, Multiple sensors (105) are sequentially arranged on the workbench (101) along the x-axis direction, and each sensor (105) is directly opposite a work station.

10. The flower basket deformation conveying and detection device as described in claim 1, characterized in that, The delivery position (307) is provided with a group of mutually cooperating through-beam sensors (106) in the diagonal direction.

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