Detection system

Abstract

The utility model discloses a detection system which comprises a conveying assembly, a control module and at least one group of detection assemblies, the detection assemblies are electrically connected with the control module, and the conveying assembly comprises at least two sections of conveying surfaces used for conveying articles and a gap between the at least two sections of conveying surfaces. The conveying assembly comprises at least two sections of conveying surfaces, the objects are conveyed between the at least two sections of conveying surfaces and pass through the gap, the detection assembly comprises a transmitting module and a receiving module, the transmitting module and the receiving module are arranged on the two sides of the conveying assembly respectively, and detection light emitted by the transmitting module can penetrate through the gap to be received by the receiving module. The detection light and the plane where the conveying face is located intersect and form a set angle. The device can be suitable for detecting letters (generally called thin letters) in express logistics, and missing detection of the thin letters is avoided.

Description

Technical Field

[0001] This utility model relates to the field of photoelectric detection technology, specifically to a detection system applicable to thin parts. Background Technology

[0002] With the rapid development of technology in the logistics and warehousing industry, various automated sorting and conveying equipment are widely used in cargo sorting operations to replace manual operations, thereby significantly improving the speed and efficiency of sorting operations.

[0003] In existing technologies, goods are generally inspected before being put into storage to mark their quantity and size, which facilitates subsequent storage and allocation. However, due to the limited resolution of the detection device, the current device is prone to missing detection when detecting thin objects. In addition, although some detection components can avoid missing detection, their structure is complex and costly. Utility Model Content

[0004] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides a detection system applicable to the detection of letters (generally referred to as thin items) in express delivery logistics, avoiding missed detections.

[0005] To achieve the above objectives, this utility model discloses a detection system, including a conveying component, a control module, and at least one set of detection components. The detection components are electrically connected to the control module. The conveying component includes at least two conveying surfaces for conveying items and a gap between the at least two conveying surfaces. The items are conveyed between the at least two conveying surfaces and pass through the gap. The detection components include a transmitting module and a receiving module, which are respectively disposed on both sides of the conveying component. The detection light emitted by the transmitting module can pass through the gap and be received by the receiving module. The detection light intersects with the plane containing the conveying surfaces.

[0006] Furthermore, the angle θ between the detection ray and the plane containing the conveying surface satisfies the following relationship: 0°<θ≤45°.

[0007] Furthermore, the conveying assembly includes a first conveying unit and a second conveying unit arranged sequentially along the conveying direction, with the gap formed between the conveying surface of the first conveying unit and the conveying surface of the second conveying unit.

[0008] Furthermore, the transmitting module includes a transmitting support and multiple transmitting ends, which are arranged side by side on the transmitting support. The receiving module includes a receiving support and multiple receiving ends, which are arranged side by side on the receiving support. The transmitting module and the receiving module are fixed to both sides of the conveying assembly by the transmitting support and the receiving support, respectively. The transmitting ends and the receiving ends correspond one-to-one and are opposite to the gap.

[0009] Furthermore, the detection beams emitted by the plurality of transmitting ends form a detection plane, which can cover the edge of the conveying surface in the width direction.

[0010] Furthermore, multiple sets of detection components are arranged along the conveying direction of the conveying component, and the spacing between the multiple sets of detection components is distributed.

[0011] Furthermore, the conveying assembly includes at least one of the following: a synchronous belt conveyor, a roller conveyor, and a chain conveyor.

[0012] Furthermore, the conveying assembly includes a conveying frame and a conveying unit disposed on the conveying frame, the conveying unit including the conveying surface, and the transmitting module and the receiving module being detachably disposed on both sides of the conveying frame.

[0013] Furthermore, the detection light is infrared light.

[0014] Furthermore, the size of the gap L satisfies the following relationship: 0 < L ≤ 10 mm.

[0015] In this technical solution, the detection light beam of the detection component intersects with the plane containing the conveying surface of the conveying component, forming an angle. Compared to the existing structure where the detection light beam is parallel to the conveying surface, the detection component in this application can circumvent the limitation of thin parts thickness, and detect thin parts by measuring their length and width dimensions, thereby avoiding the problem of missed detections caused by the resolution limitation of the detection component itself, and improving the accuracy of detection. In addition, the transmitting module and receiving module of the detection component in this application are configured on both sides of the conveying component. Compared with the structure where they are set on the top and bottom sides of the conveying component, this simplifies the installation structure of the detection component (eliminating the need for a bracket spanning the conveyor belt) and improves assembly efficiency. At the same time, this application only requires shorter transmitting and receiving modules to cover the width of the conveying component, and compared with the structure that requires a complex detection component structure to avoid missed detections, it can effectively reduce costs.

[0016] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram showing the distribution relationship between the transmitting module and the receiving module in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram showing the distribution relationship between the transmitting module and the receiving module in one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the overall detection system according to one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram showing the distribution relationship between the transmitting and receiving modules in the existing technology;

[0022] Figure 5 This is a schematic diagram of a detection component that is distributed vertically relative to the conveying component in the prior art.

[0023] in,

[0024] 10. Transmitting module; 11. Transmitting end; 12. Transmitting support; 20. Receiving module; 21. Receiving end; 22. Receiving support; 30. Conveying assembly; 31. First conveying unit; 32. Second conveying unit; 40. Object. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0026] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0027] In the logistics and warehousing field, "measuring light curtains" are frequently used to inspect objects. A measuring light curtain is a special type of photoelectric sensor. Like a regular through-beam photoelectric sensor, it consists of a transmitter and a receiver placed separately and opposite each other. However, it is larger in size, resembling a long tube. Unlike ordinary sensors that emit only a single beam of light, the transmitter of a measuring light curtain generates an array of light rays at fixed intervals along its length, forming a "light curtain." This light curtain operates by scanning, working in conjunction with a controller and software to monitor and measure the shape and dimensions of objects.

[0028] When using light curtains to inspect thin items in logistics, the resolution is often difficult to achieve below 5mm due to limitations in optical axis spacing and lens size. Since letters (i.e., thin items) in express logistics are typically less than 1mm thick, traditional inspection methods struggle to effectively identify them, leading to frequent missed detections. To avoid these missed detections, light curtains are now generally placed on the top and bottom sides of the thin item, perpendicular to its larger surface, to inspect its length and width. However, this method requires a relatively long light curtain (the length covered by the light curtain should generally be greater than the width of the conveyor surface of the conveyor assembly), and the inspection assembly needs to be supported by a bracket spanning the conveyor assembly, as shown in the attached diagram. Figure 5 As shown, it has high cost requirements.

[0029] See appendix Figure 1 , 2 3. One embodiment of this utility model discloses a detection system, including a conveying component 30, a control module, and at least one set of detection components. The detection components are electrically connected to the control module. The conveying component 30 includes at least two conveying surfaces for conveying items and a gap between the at least two conveying surfaces. The items are conveyed between the at least two conveying surfaces and pass through the gap. The detection components include a transmitting module 10 and a receiving module 20. The transmitting module 10 and the receiving module 20 are respectively disposed on both sides of the conveying component 30. The detection light emitted by the transmitting module 10 can pass through the gap and be received by the receiving module 20. The detection light intersects with the plane where the conveying surface is located.

[0030] In this embodiment, the transmitting module and the receiving module are positioned on both sides of the object 40. When in use, all the detection light rays together form the aforementioned "light curtain". When the object 40 is placed between the transmitting module and the receiving module, it will block at least a portion of the detection light rays, causing the blocked detection light rays to be unable to be received by the receiving end 21. The receiving end 21 will send a signal when it cannot receive the detection light rays, thereby realizing the detection function.

[0031] As can be clearly observed from Figures 1 and 2, gaps exist between the multiple detection beams between the transmitting and receiving modules. If the detection beams are arranged parallel to the surface of object 40, and the object size exceeds the gaps in the detection beams, object 40 is easily detected; however, when the object thickness is small, such as... Figure 4 As shown, if the thickness of the object to be tested 40 is less than the gap between adjacent detection light beams, the object 40 may not be able to block the light beams, resulting in missed detection.

[0032] To solve this problem, this embodiment adopts a method of staggering the transmitting module 10 and the receiving module 20, such as... Figure 1 , 2 As shown, the detection light beam forms a certain angle with the surface of the object 40. When the object 40 is thin, the detection light beam will be blocked by the large surface area of ​​the object 40, thus avoiding the limitation of relying solely on the object thickness for detection. This enables the detection of the object 40's conventional dimensions (i.e., length and width), effectively preventing missed detections due to the object's thinness.

[0033] As mentioned above, this utility model can convert the thickness detection of object 40 into the detection of the length and width dimensions of object 40. This can avoid the possibility of missed detection due to the small thickness of thin parts. The minimum width W of object 40 that can be detected by this utility model can be calculated as follows: W = d / arcsin(H / Wc); where,

[0034] W represents the minimum width required for inspecting thin parts;

[0035] d represents the minimum resolution of the detection component;

[0036] H represents the detection height of the detection component;

[0037] Wc is the conveying width of the conveying component 30.

[0038] In this embodiment, the transmitting module 10 and the receiving module 20 are arranged on both sides of the object 40. Compared with the structure that is arranged on the upper and lower sides of the large surface of the object 40 to avoid missed detection, the installation structure of the transmitting module 10 and the receiving module 20 in this embodiment is simpler. There is no need to set up a bracket across the conveying component 30. It is only necessary to offset the transmitting module 10 and the receiving module 20 in the arrangement direction during installation.

[0039] In this embodiment, the relative height of the transmitting module 10 and the receiving module 20 is not specifically limited. In actual installation, taking the vertical installation of the transmitting module 10 and the receiving module 20 as an example (of course, in actual use, to adapt to the site environment, the transmitting module 10 and the receiving module 20 can also be installed in a non-vertical direction, mainly to adapt to the setting of the conveying component), in practical application, the position of the transmitting module 10 can be higher than that of the receiving module 20 (e.g., ...). Figure 1 As shown), it can also be lower than the receiving module 20 (e.g. Figure 2 As shown in the figure, as long as the two are staggered so that the detection light and the plane where the conveying surface are located form a certain angle, the detection requirements can be met.

[0040] In this embodiment, when the detection device is in use, the object 40 is placed on the conveying surface of the conveying component 30 and conveyed along the conveying direction. When the object 40 moves between the transmitting module and the receiving module of the detection component, the object 40 will block the detection light. As a result, when the receiving module of the detection component cannot receive the detection signal, it will generate a detection signal and send the detection signal to the control module. The control module will record the relevant information of the object 40 to achieve the detection purpose.

[0041] The detection device in this embodiment has a simple overall structure. The transmitting module and the receiving module are set separately on both sides of the conveying component 30. The two only have a relative positional relationship and no connection relationship. This simplifies the overall structure and facilitates production and assembly.

[0042] Since the working principle of the aforementioned detection component is to determine whether the detection light is blocked, in actual setup, when there is no object 40 on the conveying surface of the conveying component 30, it should be ensured that the detection light is not blocked by the structure of the conveying component 30 itself. In this embodiment, the normal transmission of the detection light is ensured by forming a set conveying gap on the conveying component 30, and no specific limitation is made on how the gap is formed.

[0043] It should be noted that in this embodiment, the conveying direction between the two conveying surfaces can be the same or different. For example, a corner can be formed between the two conveying surfaces to change the conveying direction of the item. It is only necessary to ensure that there is a gap between the two adjacent conveying surfaces and that the item can pass through the gap during the conveying process. Then, setting a detection component at the position corresponding to the gap can achieve the above detection effect.

[0044] This embodiment does not specify the exact size of the gap; the size of the gap L can satisfy the following relationship: 0 < L ≤ 10 mm. In specific application scenarios, such as conveying objects with a large length-to-width ratio, the size of the gap L can be appropriately increased. When setting it up, it is only necessary to ensure that the gap allows the detection light to pass through, and that the object 40 does not fall out of the gap when moving along the conveying surface of the conveying assembly 30.

[0045] In one embodiment of this utility model, the angle between the detection ray and the plane containing the conveying surface is denoted as θ, where θ is 0° < θ ≤ 45°. (See attached diagram) Figure 1As shown, the transmitting module 10 and the receiving module 20 are arranged on the upper and lower sides of the object 40. In order to completely cover the conveying width of the conveying component 30, the length of the transmitting module 10 and the receiving module 20 is generally equal to or greater than the width of the conveying component 30. However, in this embodiment, the length of the transmitting module 10 and the receiving module 20 can be less than the width of the conveying component 30 to cover the entire conveying width of the conveying component 30, which can effectively reduce the length of the transmitting module 10 and the receiving module 20. H / Wc=tanθ, where H is the length of the transmitting module 10 and the receiving module 20, and Wc is the width of the conveying component 30. When θ = 45°, tanθ = 1. In order to cover the width of the conveying component 30, the length of the transmitting module 10 is equal to the width of the conveying component 30. When θ < 45°, tanθ < 1. At this time, the length of the transmitting module 10 is less than the width of the conveying component 30. It can be seen that by controlling the angle between the detection light and the plane where the conveying surface is located, the required length of the transmitting module 10 can be reduced, thereby reducing the cost.

[0046] In addition, it should be noted that the plane in which the detection light beam intersects with the conveying surface of the conveying component 30 is located is to better adapt to the detection of thin parts. In order to further adapt to the detection of thin parts with even smaller thicknesses, and to save the length of the detection component and reduce production costs, the included angle θ between the detection light beam and the plane in which the conveying surface of the conveying component 30 is located can preferably be between 5° and 10°.

[0047] It should be noted that the included angle θ in this embodiment only represents the magnitude, not the direction.

[0048] In one embodiment of the present invention, the conveying assembly 30 includes a first conveying unit 31 and a second conveying unit 32 arranged sequentially along the conveying direction, and the gap is formed between the conveying surface of the first conveying unit 31 and the conveying surface of the second conveying unit 32.

[0049] In this embodiment, the conveying component 30 is configured to connect the first conveying unit 31 and the second conveying unit 32, which facilitates adjustment and control of the gap on the conveying component 30 during installation.

[0050] In one embodiment of this utility model, the transmitting module 10 includes a transmitting support 12 and a plurality of transmitting ends 11, which are arranged side by side on the transmitting support 12. The receiving module 20 includes a receiving support 22 and a plurality of receiving ends 21, which are arranged side by side on the receiving support 22. The transmitting module 10 and the receiving module 20 are respectively fixed on both sides of the conveying assembly 30 through the transmitting support 12 and the receiving support 22. The transmitting ends 11 and the receiving ends 21 correspond one-to-one and are opposite to the gap.

[0051] In this embodiment, each transmitter 11 can emit detection light during use. The detection light emitted by multiple transmitters 11 can form a "light curtain", which can expand the detection range of the detection component. By setting up a transmitter support and a receiver support, the transmitter module 10 and receiver module 20 can be installed more conveniently, improving the flexibility and safety of the product when the light curtain is blocked.

[0052] In this embodiment, the smaller the interval between the transmitters 11, the higher the detection resolution of the detection component. In actual use, the interval (equivalent to resolution) between adjacent transmitters 11 can be controlled according to the actual application scenario, which can improve detection accuracy while reducing costs.

[0053] In one embodiment of this utility model, the detection rays emitted by the plurality of transmitting ends 11 form a detection plane, which can cover both sides of the conveyor surface in the width direction. This arrangement can achieve blind-angle detection of the conveyed object 40 on the conveyor surface, improving the accuracy of detection. For easier understanding, an example is given: assuming the width of the conveyor assembly 30 is 1M, and the size of the object 40 is small, only 10cm, the light curtain of the detection assembly covers the center of the conveyor assembly 30, with an area of ​​0.8M. Then, a 10cm gap will be left at the edge of the conveyor assembly 30. If the object 40 is not placed within the detection light curtain in the central area, but is placed at the edge, then the object 40 will not be detected by the detection assembly. Therefore, in this embodiment, the detection ray (light curtain) range of the detection assembly is set to completely cover the width of the conveyor belt.

[0054] In one embodiment of this utility model, multiple sets of detection components are arranged along the conveying direction of the conveying component, and the spacing between the multiple sets of detection components is distributed.

[0055] In this embodiment, multiple sets of detection components are arranged along the conveying direction, so that multiple detections can be performed during a single conveying process, avoiding false detections or missed detections that may occur with single detection. In actual setup, the multiple sets of detection components can be set to different types of detection methods to make the detection more accurate.

[0056] As one embodiment of the present invention, the conveying assembly includes at least one of the following: a synchronous belt conveyor, a roller conveyor, and a chain conveyor.

[0057] In this embodiment, the conveying unit of the conveying component can flexibly adopt a synchronous belt conveying mechanism, a roller conveying mechanism, or a chain plate conveying mechanism, or any combination of these mechanisms, such as the combined use of a synchronous conveying mechanism and a roller conveying mechanism. In this case, the detection component can be cleverly set in the gap where the two are joined.

[0058] As one embodiment of this utility model, the conveying assembly consists of a conveying frame and a conveying unit thereon. The conveying unit includes a conveying surface, and the transmitting module and the receiving module can be easily installed and removed from both sides of the conveying frame.

[0059] In this embodiment, the transmitting module and the receiving module can be fastened to the conveying frame by bolts, rivets, etc., or they can be installed on the conveying frame by convenient methods such as snap-fit ​​and plug-in, which facilitates the assembly and debugging of the two.

[0060] In one embodiment of this utility model, the detection light is infrared light.

[0061] This embodiment uses infrared light as the detection light, which has advantages such as high precision, non-contact measurement, strong real-time performance, strong adaptability, and high safety. These advantages enable the detection component in this embodiment to be widely used in industrial production, automated logistics, intelligent manufacturing, and other fields.

[0062] The relative spacing between the transmitting module and the receiving module in this utility model matches the lateral width of the conveying component 30, effectively preventing external components from interfering with the object 40 in the conveying component. In addition, this embodiment does not strictly limit the connection method between the transmitting module and the receiving module and the conveying component 30. They can be set independently or integrated with the conveying component 30.

[0063] In this invention, the detection light beam of the detection component intersects with the plane containing the conveying surface of the conveying component 30 and forms a set angle. Compared with the existing structure where the detection light beam is parallel to the conveying surface, the detection component in this application can bypass the limitation of the thickness of the thin part, and thus detect the thin part by detecting its length and width dimensions. This avoids the problem of missed detection caused by the resolution of the detection component itself, and improves the detection accuracy. In addition, the transmitting module and receiving module of the detection component in this application are set on both sides of the conveying component 30. Compared with the structure set on the upper and lower sides of the conveying component 30, the installation structure of the detection component is simplified (no need for a bracket spanning the conveyor belt), and the assembly efficiency is improved. Moreover, this application only requires a shorter transmitting module 10 and receiving module 20 to cover the width of the conveying component 30, which reduces the cost.

[0064] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A detection system comprising a transport assembly (30), a control module and at least one set of detection assemblies, the detection assemblies being electrically connected to the control module, characterized in that, The conveying assembly (30) comprises at least two conveying surfaces for conveying articles and a gap between the at least two conveying surfaces, the articles being conveyed between the at least two conveying surfaces and passing through the gap, the detection assembly comprises a transmitting module (10) and a receiving module (20), the transmitting module (10) and the receiving module (20) are respectively arranged on two sides of the conveying assembly (30), the detection light emitted by the transmitting module (10) can pass through the gap and be received by the receiving module (20), and the detection light intersects with a plane in which the conveying surface is located.

2. The detection system of claim 1, wherein, An angle θ between the detection light and the plane in which the conveying surface is located satisfies the following relationship: 0° < θ ≤ 45°.

3. The detection system of claim 1, wherein, The conveying assembly (30) comprises a first conveying unit (31) and a second conveying unit (32) arranged in sequence along a conveying direction, and the gap is formed between a conveying surface of the first conveying unit (31) and a conveying surface of the second conveying unit (32).

4. The detection system of claim 1, wherein, The transmitting module (10) comprises a transmitting support portion (12) and a plurality of transmitting ends (11), the plurality of transmitting ends (11) are arranged side by side on the transmitting support portion (12), the receiving module (20) comprises a receiving support portion (22) and a plurality of receiving ends (21), the plurality of receiving ends (21) are arranged side by side on the receiving support portion (22), the transmitting module (10) and the receiving module (20) are respectively fixed on two sides of the conveying assembly (30) through the transmitting support portion (12) and the receiving support portion (22), the transmitting ends (11) and the receiving ends (21) correspond one by one, and the transmitting ends (11) and the receiving ends (21) are opposite to the gap.

5. The detection system of claim 4, wherein, The detection light emitted by the plurality of transmitting ends (11) forms a detection plane, and the detection plane can cover edges in a width direction of the conveying surface.

6. The detection system of any one of claims 1 to 5, wherein, A plurality of detection assemblies are arranged along a conveying direction of the conveying assembly (30), and the plurality of detection assemblies are distributed at intervals.

7. The detection system of any one of claims 1 to 5, wherein, The conveying assembly (30) comprises at least one of the following: a synchronous belt conveying mechanism, a roller conveying mechanism, and a chain plate conveying mechanism.

8. The detection system of any one of claims 1 to 5, wherein, The conveying assembly (30) comprises a conveying frame and a conveying unit arranged on the conveying frame, the conveying unit comprises the conveying surface, and the transmitting module (10) and the receiving module (20) are detachably arranged on two sides of the conveying frame.

9. The detection system of any one of claims 1 to 5, wherein, The detection light is infrared light.

10. The detection system of any one of claims 1 to 5, wherein, A size of the gap L satisfies the following relationship: 0 < L ≤ 10 mm.

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