SMT (Surface Mount Technology) tray detection assembly

Abstract

The utility model provides an SMT charging tray detection assembly, comprising a PCB circuit board, an emitter, a receiver, an isolation blocking structure and an opposite side light absorption blocking structure, the PCB circuit board is provided with a plurality of charging tray detection ends, and a charging tray grid is arranged between every two adjacent charging tray detection ends; each tray detection end is provided with a pair of matched emitter and receiver, the emitter and the receiver are respectively arranged at two ends of the same tray detection end, and the isolation blocking structure is arranged between the emitter and the receiver of the same tray detection end; one side of the charging tray detection end is provided with the opposite-side light absorption blocking structure, and the opposite-side light absorption blocking structure is arranged on one side, close to the mounting surfaces of the emitter and the receiver, of the charging tray detection end. The SMT tray detection assembly can well avoid the problem of false triggering, is easy to design and implement, can be continuously used, and effectively improves the actual use effect and the application range of the SMT tray detection assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of material tray detection, in particular to an SMT material tray detection component. Background Art

[0002] In modern electronic equipment production, to reduce errors and improve efficiency, manufacturers are widely adopting electronic material racks for material management. These racks are linked to production management systems such as Manufacturing Execution Systems (MES) and Warehouse Management Systems (WMS) for data exchange. This ensures accurate and efficient transition from technical data to production, while also enabling optimized material management based on a first-in, first-out (FIFO) approach for material trays, significantly reducing production and management costs. Currently, two types of surface-mounted (SMT) material management methods are used: barcode scanning and inductive. SMT stands for Surface Mount Technology. Inductive SMT racks are a preferred solution for major companies due to their ease of use and ability to monitor real-time operations. However, traditional inductive SMT racks use a beam-based sampling method. In actual production, this method can fail to ensure that the transmitted signal reflects or refracts on the tray surface, preventing it from fully passing through the observation window. This can result in false detection of missing material. Furthermore, due to the presence of highly transparent materials such as acrylic on the tray, signal strength differences can be minimal, leading to false triggering and unreliable operation. Therefore, the existing SMT tray detection solution based on the beamforming method has problems such as easy false triggering and inability to be used continuously, which significantly limits its actual use effect and scope of application. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an SMT tray detection component, which aims to effectively avoid the problems of false triggering and inability to be used continuously based on diffuse reflection method and optimized structural design, and improve the actual use effect and application scope of the SMT tray detection component.

[0004] In this regard, the utility model provides an SMT tray detection component, including: a PCB circuit board, a transmitter, a receiver, an isolation blocking structure and an opposite light absorption blocking structure, wherein a plurality of tray detection ends are arranged on the PCB circuit board, and a tray grid opening is located between every two adjacent tray detection ends; each tray detection end is provided with a matching pair of transmitters and receivers, and the transmitter and receiver are respectively arranged at the two ends of the same tray detection end, and the isolation blocking structure is arranged between the transmitter and the receiver of the same tray detection end; the opposite light absorption blocking structure is provided on one side of the tray detection end, and the opposite light absorption blocking structure is arranged on the side of the tray detection end close to the mounting surface of its transmitter and receiver; wherein the mounting surfaces of the transmitter and receiver respectively form an acute angle with the perpendicular bisector of the tray detection end.

[0005] A further improvement of the present invention is that the material tray is provided with a material observation window, and the depth from the signal reflection point of the transmitter to the bottom of the material tray grid is set to half the height from the bottom of the material observation window to the bottom of the material tray.

[0006] A further improvement of the present invention is that the length of the isolation blocking structure is greater than a first preset multiple of the projection lengths of the transmitter and the receiver in the horizontal direction, and the first preset multiple is greater than 1.

[0007] A further improvement of the present invention is that the height of the isolation blocking structure is greater than a second preset multiple of the height of any one of the transmitter and receiver components, and the second preset multiple is greater than 1.

[0008] A further improvement of the present invention is that the first preset multiple and the second preset multiple are 1.2.

[0009] A further improvement of the present invention is that the center points of the transmitter, receiver and isolation blocking structure are located on the same vertical line.

[0010] A further improvement of the present invention is that the receiver is arranged at the bottom end of the tray detection end, and the transmitter is arranged at the top end of the tray detection end.

[0011] A further improvement of the present invention is that the height of the opposite-side light-absorbing blocking structure is consistent with the depth of the tray opening, and completely blocks the mounting surfaces of the transmitter and receiver at the tray detection end.

[0012] A further improvement of the present invention is that the isolation blocking structure adopts an isolation baffle, and the opposite-side light absorption blocking structure adopts an opposite-side light absorption plate.

[0013] A further improvement of the present invention is that the depth from the signal reflection point of the transmitter to the bottom of the material tray grid opening is greater than half of the center distance between the transmitter and the receiver.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: a plurality of tray detection ends are provided on the PCB circuit board, and a tray grid is formed between every two adjacent tray detection ends, so as to facilitate the independent detection of multiple trays at the same time; each tray detection end is provided with a matching pair of transmitters and receivers, and the transmitter and receiver are respectively provided at the two ends of the same tray detection end, and the isolation blocking structure is provided between the transmitter and the receiver of the same tray detection end, so that sampling can be achieved based on diffuse reflection on the same side of the tray, and the isolation blocking structure effectively avoids the emitted light of the transmitter being erroneously received by the receiver and causing false triggering; on this basis, an opposite light absorption blocking structure for absorbing light is also provided on one side of the tray detection end, and the opposite light absorption blocking structure is provided on the side of the tray detection end close to the mounting surface of its transmitter and receiver.

[0015] Therefore, in the state of no material tray, the emitted light of the transmitter is blocked by the isolation blocking structure and is also absorbed by the light-absorbing blocking structure on the opposite side, so that the receiver cannot receive the transmitted signal. At this time, it can be quickly determined that the current state of the material tray grid is no material tray; in the state of having a material tray, the emitted light of the transmitter is blocked by the isolation blocking structure, and the transmitted signal on the side close to the material tray will be received by the receiver. Even if the material tray contains materials such as acrylic with high transparency, the problem of false triggering will no longer occur, and the material tray detection can be accurately and quickly realized, which well avoids the problem of false triggering. It is easy to design and implement, and can be used continuously, effectively improving the actual use effect and application scope of the SMT material tray detection component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of an embodiment of the utility model;

[0017] Figure 2 This is another structural schematic diagram of an embodiment of the utility model;

[0018] Figure 3 This is a structural diagram of a material tray according to an embodiment of the present invention;

[0019] Figure 4 This is a structural diagram of another material tray according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic structural diagram of a PCB circuit board according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic structural diagram of an embodiment of the present invention during the detection process;

[0022] Figure 7 This is a schematic diagram of a partial structural method of an embodiment of the utility model;

[0023] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of A;

[0024] Figure 9 yes Figure 7 Schematic diagram of the local structure in;

[0025] Figure 10 It is a simplified schematic diagram of the principle of an embodiment of the utility model.

[0026] Figure identification: 1-PCB circuit board; 101-tray detection end; 2-emitter; 201-first emitted light; 202-second emitted light; 3-receiver; 4-isolation blocking structure; 5-opposite side light absorption blocking structure; 6-tray opening; 7-tray; 701-tray detection surface; 702-material observation window; 703-material; 704-tray shaft. DETAILED DESCRIPTION

[0027] In the description of this utility model, if there is a description of orientation, such as "upper", "lower", "front", "back", "left", "right", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on this utility model. If a technical feature is referred to as being "set", "fixed", "connected", or "installed" on another technical feature, it can be directly set, fixed, or connected to the other technical feature, or it can be indirectly set, fixed, connected, or installed on the other technical feature.

[0028] In the description of this utility model, if "several" is mentioned, it means more than one; if "plurality" is mentioned, it means more than two; if "greater than," "less than," or "exceeds," it should be understood as excluding the number itself; if "above," "below," or "within" is mentioned, it should be understood as including the number itself. If "first," "second," etc. is mentioned, it should be understood that it is only used to distinguish the names of identical or similar technical features, and should not be understood to imply or indicate the relative importance of the technical features, the number of technical features, or the order of the technical features.

[0029] The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Before introducing the specific embodiments of the present application, Figure 3 and Figure 4 The two commonly used trays shown are explained and illustrated. Figure 3 and Figure 4 In the diagram, the left side structure shows the front view of the tray 7, and the right side structure shows the side view of the tray 7. Figure 3 The material tray 7 shown has a material observation window 702, and Figure 4 The illustrated tray 7 lacks a material observation window. Material observation window 702 is a window structure used to estimate the remaining material quantity using the tray scale. In both types of trays 7, the tray detection surface 701 serves as the detection surface for the transmitter 2 and receiver 3, enabling detection by diffusely reflected light regardless of front or back. Material 703 refers to the material wrapped around the tray 7, and the tray shaft 704 is used to rotate the tray 7.

[0031] If the traditional through-beam method is used to implement SMT tray detection, since the through-beam method requires reflection or refraction on the surface of the tray 7 and enters the receiving end on the opposite side, the detection is then performed by judging the ratio of the received signal at the receiving end and the threshold. However, in actual applications, various factors may exist and it is impossible to guarantee that the transmitted signal can be reflected or refracted on the surface of the tray, which may easily lead to the signal not being able to pass through the material observation window 702, thereby causing the false detection of no material. In addition, if the tray 7 contains material 703 made of a highly transparent material such as acrylic, in this application scenario of the through-beam method, the transmitted signal changes very little. In this case, not only does a high-precision ADC module need to be used for sampling, but even if a high-precision ADC module is used, due to interference from ambient light, this signal with very little change needs to be judged and processed through a threshold. The setting of the threshold obviously has the problems of high precision, high difficulty and high cost, and will further increase the probability of false triggering, making the tray detection unable to be used continuously.

[0032] Unlike the existing technology, this application adopts diffuse reflection and optimized structural design, which avoids the processing of small signals in principle, because the signal required for reflection is as strong as possible. In the optimized structural design, in the state without a material tray, the transmitted signal has been blocked and absorbed, so there will be no false triggering phenomenon, and there is no need to accurately set the judgment threshold. The overall technical solution is more reasonable and efficient, easy to design and implement, and the continuous service life is greatly improved.

[0033] Specifically, such as Figures 1 to 10As shown, this embodiment provides an SMT tray detection component, including: a PCB circuit board 1, a transmitter 2, a receiver 3, an isolation blocking structure 4 and an opposite light absorption blocking structure 5, wherein a plurality of tray detection ends 101 are provided on the PCB circuit board 1, and a tray grid opening 6 is provided between every two adjacent tray detection ends 101; each tray detection end 101 is provided with a matching pair of transmitters 2 and receivers 3, and the transmitters 2 and receivers 3 are respectively arranged at the two ends of the same tray detection end 101, and the isolation blocking structure 4 is arranged between the transmitter 2 and the receiver 3 of the same tray detection end 101; the opposite light absorption blocking structure 5 is provided on one side of the tray detection end 101, and the opposite light absorption blocking structure 5 is arranged on the side of the tray detection end 101 close to the mounting surface of its transmitter 2 and receiver 3; wherein, the mounting surfaces of the transmitter 2 and the receiver 3 respectively form an acute angle with the perpendicular bisector of the tray detection end 101.

[0034] In this embodiment, the PCB circuit board 1 is the main control circuit board of the SMT material tray detection assembly. The PCB circuit board 1 is provided with multiple material tray detection terminals 101 for implementing diffuse reflection detection of the material tray 7. Between each two adjacent material tray detection terminals 101 is a material tray opening 6. The material tray opening 6 is a window structure for placing the material tray 7, which facilitates the independent detection of multiple material trays 7 at the same time.

[0035] like Figure 1 、 Figure 2 as well as Figures 6 to 8 As shown, each tray detection end 101 of this embodiment is provided with a matching pair of emitters 2 and receivers 3. The emitters 2 and receivers 3 are respectively a diffuse reflection emitter (a diffuse reflection device for emitting light) and a diffuse reflection receiver (a diffuse reflection device for receiving light). That is, the emitters 2 and receivers 3 are provided in a matching pair, and the pair of matched emitters 2 and receivers 3 are provided on the same side of the tray 7. The sampling of the emission signal is achieved through the emission and reception process of diffuse reflection. The emission signal refers to the signal of the emitted light. The emitters 2 and receivers 3 are respectively provided at the two ends of the same tray detection end 101. In addition, the isolation blocking structure 4 is provided between the emitter 2 and receiver 3 of the same tray detection end 101. The isolation blocking structure 4 is preferably an isolation baffle for isolating and blocking the passage of the emitted light. Therefore, this embodiment can achieve sampling based on diffuse reflection on the same side of the tray 7, and the isolation blocking structure 4 effectively prevents the emitted light of the emitter 2 from being erroneously received by the receiver 3, resulting in false triggering.

[0036] The mounting surfaces of the transmitter 2 and receiver 3 in this embodiment respectively form an acute angle with the perpendicular midline of the tray detection end 101, and the acute angle is defined as the preset mounting angle θ1 of the transmitter 2 and receiver 3, so as to provide a basis for diffuse reflection. The mounting surface refers to the mounting structure at the bottom of the transmitter 2 and receiver 3. In actual applications, the preset mounting angle θ1 can be set and adjusted according to actual conditions and needs; it can also be set by default to the angle θ3 between the center transmission signal of the transmitter 2 lamp bead and the horizontal plane when the emission angle at the strongest radiation position is equal to 0. The angle θ3 can be calculated by the formula tanθ3=be / ce = L5 / (2*L3), where the center distance L5 between the transmitter 2 and the receiver 3 can be calculated by the formula (tanθ4) *L5 2 + 2*(L8-L3) *L5 +4*L3*L8*tanθ4 = 0 for calculation, where L3 = L4-L7, representing the maximum transmission distance of emitter 2; L8 = L4-L7', representing the minimum transmission distance of emitter 2; and the width L4 of the tray opening 6, the thickness L7 of the narrowest tray 7, the thickness L7' of the widest tray, and the half-decay angle θ4 of emitter 2 are known parameters. Of course, this is only one preferred embodiment. In actual applications, this acute angle can be sufficient to meet the diffuse reflection requirements within the tray opening 6.

[0037] It should be noted that the pair of emitters 2 and receivers 3 used in this embodiment adopt diffuse reflection and are arranged on a tray detection end 101, that is, on the same side of the tray 7; and in the corresponding tray opening 6, the opposite light absorption blocking structure 5 is arranged on the other side of the tray 7. In addition, the emitting end of the emitter 2 (the end away from the mounting surface) is obliquely incident on the tray 7 at a preset mounting angle θ1, so that the emitted light can be diffusely reflected on the tray detection surface 701, as shown in FIG. Figure 6 As shown in the optical path of the second emission light 202, the second emission light 202 refers to the received emission light. Even if there is a material observation window 702 on the material tray 7 or a transparent material 703, as long as part of the second emission light 202 is successfully received by the receiver 3, it can be accurately determined that the current state of the material tray opening 6 is that there is a material tray 7. Therefore, this embodiment does not need to set a very precise judgment threshold as in the prior art using a cross-beam method. Therefore, this embodiment can effectively avoid the problem of false triggering and can be used continuously. In addition, due to the use of an optimized structural design, it is only necessary to determine whether a transmission signal is received. The required threshold setting range is wide, and there is no need to perform precise and difficult threshold setting as in the prior art. The overall technical solution is more reasonable, efficient, and easy to implement.

[0038] In practical applications, after the portion of the second transmitted light 202 is successfully received by the receiver 3, it can preferably be conventionally amplified by an amplification and comparison circuit (e.g., an integrated circuit such as a multi-stage amplifier) ​​before being transmitted to the main control unit MCU. Of course, this process is a preferred embodiment and is not a required feature of this embodiment. The transmitted light (also referred to as the detection beam) from the transmitter 2 in this embodiment can be monochromatic light with a wavelength of 940 nm or 860 nm, or other detectable wavelengths. It is sufficient to ensure that the wavelength of the light beam emitted by the transmitter 2 matches the wavelength receivable by the receiver 3.

[0039] On this basis, the material tray detection end 101 described in this embodiment is further provided with an opposite light absorption blocking structure 5 for absorbing light on one side. In each material tray grid 6, there is one and only one side provided with the opposite light absorption blocking structure 5. The opposite light absorption blocking structure 5 preferably adopts an opposite light absorption plate, which is used to absorb the emitted light when there is no material tray 7 (no material tray 7); the opposite light absorption blocking structure 5 is arranged on the side of the material tray detection end 101 close to the mounting surface of its transmitter 2 and receiver 3, so as to ensure that the emitted light of the previous material tray detection end 101 is effectively absorbed when there is no material tray 7, so as to avoid the problem of part of the emitted light being successfully received when there is no material tray 7, effectively avoid the disadvantages of false triggering, and reduce the difficulty and requirements for threshold setting.

[0040] like Figure 6 and Figure 7 As shown, the detection process of the SMT tray detection assembly of this embodiment is as follows: the light emitted by the transmitter 2 to the receiver 3 of the same tray detection end 101 is isolated and blocked by the isolation blocking structure 4. In the state where there is no tray 7, the light emitted by the transmitter 2 to the next tray detection end 101 is absorbed by the opposite side light absorption blocking structure 5 (i.e., the corresponding opposite side light absorption blocking structure 5) set at the next tray detection end 101. At this time, the absorbed light is Figure 6 It is represented as the first emitted light 201, so that the receiver 3 cannot receive the emission signal corresponding to the first emitted light 201. Therefore, it can quickly and accurately determine that the current state of the tray opening 6 is that there is no tray 7. When there is a tray 7, the emission light of the transmitter 2 directed to the next tray detection end 101 is projected onto the tray detection surface 701 of the tray 7, and is then received by the receiver 3 of the same tray detection end 101 through diffuse reflection. That is, the matching / adapted receiver 3 successfully receives the emission signal and determines that the current state of the tray opening 6 is that there is a tray 7. At this time, the received emission light is Figure 6The second emitted light 202 is represented in the middle. Since this embodiment adopts diffuse reflection reception located on the same side of the tray 7, even if the tray 7 contains materials 703 such as acrylic with high transparency, there will be no problem of false triggering, so that the tray 7 can be detected accurately and quickly, which effectively avoids the problem of false triggering and can be used continuously, effectively improving the actual use effect and application range of the SMT tray detection component.

[0041] exist Figures 6 to 10 The definitions of various parameters are as follows: L1 is the length of the isolation blocking structure 4; L2 is the length (also called width) of the opposite light-absorbing blocking structure 5; L3 is the designed maximum reflection distance, that is, the maximum transmission distance of the transmitter 2; L4 is the width of the tray opening 6; L5 is the center distance between the transmitter 2 and the receiver 3; L6 is the projected length of the transmitter 2 and the receiver 3 in the horizontal plane; L7 is the thickness of the narrowest tray; L7' is the thickness behind the widest tray; L8 is the designed minimum reflection distance, that is, the minimum transmission distance of the transmitter 2; H1 is the height of the isolation blocking structure 4; H2 is the height of the opposite light-absorbing blocking structure 5, which is also used to indicate the depth of the tray opening 6; H3 is the depth from the central transmission signal reflection point to the bottom of the tray opening 6, that is, the depth from the signal reflection point of the transmitter 2 to the bottom of the tray opening 6; θ1 is the preset installation angle between the transmitter 2 and the transceiver 3 and the vertical line; θ2 and θ5 are auxiliary angles; θ3 is the emission angle at the strongest radiation position When the angle is equal to 0, the included angle between the central emission signal of the lamp bead and the horizontal plane is the included angle between the central emission signal of the lamp bead of emitter 2 and the horizontal plane when the emission angle is equal to 0, which is the angle between the horizontal plane and the central emission signal of the lamp bead of emitter 2 when the emission angle at the strongest radiation position is equal to 0. θ4 is the half-decay angle, which can be obtained from the factory data of emitter 2. It is used to represent the half-decay angle parameter of the angle between the central light intensity of emitter 2 and the 1 / 2 light intensity line. a is the center point of receiver 3, b is the center point of emitter 2, c is the far-end reflection point, d is the near-end reflection point, and e is the intersection of the auxiliary line passing through points d and c and the perpendicular line passing through points a and b. Since the distance between the far-end reflection point c and the near-end reflection point d is the same, H3, from the deepest edge of the material pan grid opening 6, and the distance from the material pan grid opening 6 is referenced to the horizontal plane, ce is perpendicular to ab, resulting in θ3 and θ3' being equal. θ3' is the auxiliary angle, and θ5 = θ3' + θ4 = θ3 + θ4.

[0042] In order to ensure the detection stability of the material tray 7, this embodiment also needs to consider a certain margin. The depth H3 from the signal reflection point of the transmitter 2 to the bottom of the material tray opening 6 is selected by default as half of the height H0 between the bottom of the material observation window 702 and the bottom of the material tray 7, that is, the default value H3=H0 / 2, to ensure that even if the material tray 7 is provided with a material observation window 702, the reflection path of the central light path will not be affected by the position of the material tray 7.

[0043] It is also worth noting that Figure 7 and Figure 8 As shown, preferably, the length L1 of the isolation blocking structure 4 in this embodiment is greater than a first preset multiple of the horizontal projection length L6 of the emitter 2 and the receiver 3, and the first preset multiple is greater than 1. The first preset multiple refers to a pre-set multiple threshold value, which can be set and adjusted according to actual conditions and needs. In this embodiment, the first preset multiple defaults to 1.2, thereby completely isolating and blocking the light emitted from the emitter 2 to the receiver 3 in the same tray detection end 101 in the horizontal direction to avoid the possibility of false triggering.

[0044] The height H1 of the isolation barrier structure 4 in this embodiment is greater than a second preset multiple of the height of either the transmitter 2 or the receiver 3, where the second preset multiple is greater than 1. The height H1 of the isolation barrier structure 4 is related to the height of the transmitter 2 and the receiver 3. The second preset multiple refers to another pre-set multiple threshold value that can be set and adjusted based on actual conditions and needs. In this embodiment, the second preset multiple can also default to 1.2, thereby completely isolating and shielding the transmitter 2 and the receiver 3 in the vertical direction to further prevent the possibility of false triggering.

[0045] In actual production, it is necessary to ensure the isolation and blocking effect between the transmitter 2 and the receiver 3 in the same tray detection end 101 in the horizontal and vertical directions. In addition to the length and height dimensions, the installation position will also have an impact. Therefore, the center points of the transmitter 2, receiver 3 and isolation and blocking structure 4 in this embodiment are located on the same vertical line, such as Figures 7 and 8 As shown, it can not only ensure its isolation and blocking effects, but also be more conducive to product processing and production, and improve product production yield.

[0046] In this embodiment, a matching / adapted transmitter 2 and receiver 3 need to be set in the same tray detection end 101, that is, the receiver 3 is set at the bottom end of the tray detection end 101, and the transmitter 2 is set at the top end of the tray detection end 101, such as Figure 2 As shown; the receiver 3 may also be provided at the top of the tray detection end 101, and the transmitter 2 may be provided at the bottom of the tray detection end 101, as shown Figure 1 As shown; the above two actual setting methods can be selected according to application requirements or scenarios. Since the receiver 3 is more susceptible to the influence of sunlight, it is preferred that Figure 2As shown in FIG, the receiver 3 of this embodiment is arranged at the bottom end of the tray detection end 101, and the transmitter 2 is arranged at the top end of the tray detection end 101. If the receiver 3 is arranged at the top end of the tray detection end 101, the design requirements will be higher. Therefore, in order to meet various application requirements and expand the applicability of the product, in other drawings of this embodiment, it is preferred to show and explain the transmitter 2 at the bottom end of the tray detection end 101 and the receiver 3 at the top end of the tray detection end 101.

[0047] The height H2 of the opposite-side light-absorbing blocking structure 5 described in this embodiment is related to the mounting structure, namely, the depth of the tray opening 6. It is necessary to ensure that its height completely blocks the structural components behind it. This prevents the first emitted light 201 from being reflected by other structural components and received by any receiver 3 when the tray 7 is not present, thereby preventing false triggering. Therefore, preferably, the height H2 of the opposite-side light-absorbing blocking structure 5 described in this embodiment is consistent with the depth of the tray opening 6, and completely blocks the mounting surfaces of the transmitter 2 and receiver 3 of the tray detection end 101.

[0048] It should be noted that if Figure 10 As shown, the depth H3 from the signal reflection point of the transmitter 2 to the bottom of the tray opening 6 in this embodiment is greater than half the center-to-center distance L5 between the transmitter 2 and the receiver 3. The signal reflection points of the transmitter 2 include a distal reflection point c and a proximal reflection point d. In this embodiment, the depth H3 from the signal reflection point to the bottom of the tray opening 6 needs to be greater than half the center-to-center distance L5 between the transmitter 2 and the receiver 3 to meet the actual installation requirements of the transmitter 2 and avoid design errors.

[0049] The specific implementation methods described above are preferred implementation methods of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the shape and structure of the present invention are within the scope of protection of the present invention.

Claims

1. An SMT tray detection component, characterized in that: include: PCB circuit board, transmitter, receiver, isolation blocking structure and opposite side light absorption blocking structure, the PCB circuit board is provided with multiple tray detection ends, and a tray grid is located between every two adjacent tray detection ends; each tray detection end is provided with a matching pair of transmitter and receiver, the transmitter and receiver are respectively arranged at the two ends of the same tray detection end, and the isolation blocking structure is arranged between the transmitter and receiver of the same tray detection end; the opposite side light absorption blocking structure is provided on one side of the tray detection end, and the opposite side light absorption blocking structure is arranged on the side of the tray detection end close to the mounting surface of its transmitter and receiver; wherein, the mounting surfaces of the transmitter and receiver respectively form an acute angle with the perpendicular bisector of the tray detection end.

2. The SMT tray detection component according to claim 1, characterized in that: The material tray is provided with a material observation window, and the depth from the signal reflection point of the transmitter to the bottom of the material tray grid is set to half the height from the bottom of the material observation window to the bottom of the material tray.

3. The SMT tray detection component according to claim 1, characterized in that: The length of the isolation blocking structure is greater than a first preset multiple of the projection lengths of the transmitter and the receiver in the horizontal direction, and the first preset multiple is greater than 1.

4. The SMT tray detection component according to claim 3, characterized in that: The height of the isolation barrier structure is greater than a second preset multiple of the height of any one of the transmitter and receiver components, and the second preset multiple is greater than 1.

5. The SMT tray detection component according to claim 4, characterized in that: The center points of the transmitter, receiver and isolation barrier structure are located on the same vertical line.

6. The SMT tray detection component according to claim 4, characterized in that: The first preset multiple and the second preset multiple are both 1.

2.

7. The SMT tray detection component according to any one of claims 1 to 6, characterized in that: The receiver is arranged at the bottom end of the tray detection end, and the transmitter is arranged at the top end of the tray detection end.

8. The SMT tray detection component according to any one of claims 1 to 6, characterized in that: The height of the opposite light-absorbing blocking structure is consistent with the depth of the tray opening, and completely blocks the installation surfaces of the transmitter and receiver at the tray detection end.

9. The SMT tray detection component according to any one of claims 1 to 6, characterized in that: The isolation blocking structure adopts an isolation baffle, and the opposite-side light absorption blocking structure adopts an opposite-side light absorption plate.

10. The SMT tray detection component according to any one of claims 1 to 6, characterized in that: The depth from the signal reflection point of the transmitter to the bottom of the tray opening is greater than half of the center distance between the transmitter and the receiver.

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