CN116605532A - Structure for detecting feeding and discharging frames of SMT (surface mounted technology) material trays by using photoelectric sensor - Google Patents

Abstract

The invention belongs to the technical field of electronic material storage devices, and in particular relates to a structure for detecting an SMT material tray feeding and discharging frame by using a photoelectric sensor, which comprises the following steps: the device comprises a support piece, a circuit board, n rotating pieces which are arranged on the support piece and can rotate relative to the support piece, n photoelectric sensors which are connected with the circuit board, and shielding parts which are arranged on each rotating piece; the shielding parts are respectively corresponding to the photoelectric sensors and are used for shielding the photoelectric sensors at the corresponding positions; the photoelectric sensor is positioned at the outer side of the movement path of the shielding part corresponding to the photoelectric sensor; n is an integer and n is not less than 2. In the prior art, the material tray is matched with the photoelectric sensor, and the material tray is not manufactured by adopting the same standard, so that the current intelligent material rack is difficult to accurately judge the material tray taking and placing condition of a certain material tray clamping position; compared with similar products in the prior art, the intelligent material rack has the effects of being convenient for the intelligent material rack to accurately judge the material tray taking and placing condition of a certain material tray clamping position and avoiding loss caused by misjudgment of the intelligent material rack.

Description

A structure that uses a photoelectric sensor to detect the entry and exit of SMT trays

technical field

The invention relates to the technical field of electronic material storage devices, and specifically refers to a structure that uses a photoelectric sensor to detect the feeding and discharging racks of trays storing SMT materials.

Background technique

SMT electronics factory produces a circuit board, which requires thousands of parts to be patched and assembled together. Due to the variety of parts, material access management is very labor-intensive, so smart racks for storing SMT electronic materials are gradually becoming popular. In the early days, a barcode was pasted on each storage position. When the user puts the material into the warehouse, first brush the barcode on the material tray, and then swipe the barcode on the storage position, so that the computer that manages the material rack can remember the storage position of the material tray. When retrieving the material, the computer can control the light on the storage position of the reclaimed material to guide the user to reclaim the material. However, in addition to the fact that the user has to swipe the barcode twice, the user cannot report to the police if the storage position is misplaced, which is still lacking in use. Therefore, after the user swipes the barcode on the tray, it is particularly important to be able to automatically detect which storage position is put into it.

Most of the general sensing methods use photoelectric sensors to detect the state of putting in or taking out the tray by whether the placed tray blocks the light of the photoelectric sensor. However, when the tray is made of transparent or translucent material, the light is not completely If it is interrupted, it is impossible to accurately judge whether it receives light or not. It is necessary to measure the received luminous flux, and use statistics or even AI algorithms to judge whether there is no material tray or a transparent material tray. Although this method can solve some problems, due to the composition of the photoelectric sensor The power of the transmitter and the sensitivity of the receiver will change with the environment and use time, and the ambient light will also interfere with the photoelectric sensor, resulting in inaccurate detection and judgment; especially for SMT material suppliers, there is no need to consider Due to the problem of photoelectric sensors, there is no industry standard for the color and material of the tray; moreover, due to cost considerations, most current SMT material suppliers use translucent thin plastic sheets to make trays. As far as the actual use of the SMT electronics factory is concerned, the wrong electronic components will lead to the scrapping of the entire batch of circuit boards, and the inaccurate storage records will cause the smart rack to lose its practical value. Therefore, the misjudgment of the smart rack will lead to serious consequences. to major economic losses.

Contents of the invention

In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a structure that uses a photoelectric sensor to detect the entry and exit of SMT trays into and out of the rack, which aims to solve the problem that the existing intelligent racks are difficult to accurately determine the loading and unloading of the trays.

In order to achieve the above object, the technical solution adopted by the present invention is: a structure that uses a photoelectric sensor to detect the in-and-out rack of the SMT tray, including: a support, a circuit board, and n are arranged on the support and can rotate relative to it The rotating parts, n photoelectric sensors connected to the circuit board, are arranged on the shielding parts on each rotating part; the n shielding parts correspond to the n photoelectric sensors respectively, and the shielding parts are used to shield the photoelectric sensors at corresponding positions; The photoelectric sensor is located outside the movement path of the corresponding shielding part; n is an integer and n≥2.

Preferably, the support is connected to the circuit board; the photoelectric sensor is arranged on one surface of the circuit board.

Preferably, the photoelectric sensor includes a receiver and a transmitter, and there are n through holes respectively accommodating n shielding parts in the circuit board; the receiver and transmitter of each photoelectric sensor are respectively located on both sides of one of the through holes.

Preferably, the rotating member includes a receiving bar, an adapter plate fixedly connected to one end of the receiving bar, and a rotating shaft whose two ends are movably connected to the top of the supporting member; one end of the shielding part is connected to the other end of the adapter plate .

Preferably, the other end of the receiving bar is provided with a horizontal bar perpendicular to it; a first corner is formed at the connection between the receiving bar and the adapter plate, and a second corner is formed at the position where the adapter plate is connected to the shielding part; the The rotating shaft is arranged on the outer side of the first corner and is perpendicular to the receiving bar and the adapter plate.

Preferably, a counterweight is also included, which is arranged outside the second corner and perpendicular to the shielding portion and the adapter plate.

Preferably, the horizontal bar, the receiving bar, the adapter plate and the shielding part are integrally formed; the shielding part is in the shape of a flat plate, and a dark coating is provided on both surfaces; the rotating part and the shielding part are all made of Made of blackout material.

Preferably, the support includes a supporting base, n rotating brackets arranged on the supporting base, and horizontal connecting bars connected to the tops of the n rotating brackets; each rotating bracket includes two supporting vertical plates parallel to each other, each A notch is provided on the top of each support vertical plate; n rotating brackets are respectively connected with n rotating parts, and the two ends of each rotating shaft are respectively placed in two notches of one of the rotating brackets.

Preferably, the supporting base, the rotating bracket and the transverse connecting bar are integrally formed; the supporting member is made of light-shielding material.

Preferably, the top side of each support vertical plate is provided with a hook integrally formed with it, and 2n hooking gaps are arranged on the top of the circuit board, and the hooks pass through the hooking gaps at the corresponding positions and are hooked to the hooks of the circuit board. Top; the hook is located on the front side of the notch.

Beneficial technical effects: adopt the structure of the present invention to detect the entry and exit of SMT trays into and out of the rack, and set a shielding part on the rotating part for exciting the photoelectric sensor; Corresponding; when the tray is placed in a certain position of the tray, the tray is in contact with the rotating part, and under the gravity of the tray, the rotating part rotates relative to the supporting part, and when the tray is taken out, the rotating part rotates in the opposite direction; Here, the state of the rotating member when the tray is not placed in the tray clamping position is the initial state. In this state, the shielding part blocks the photoelectric sensor. When the tray is placed in the tray clamping position, the side wall of the tray and the The rotating parts are in contact with each other, and the rotating parts rotate relative to the supporting part, and the shielding part on the rotating part rotates accordingly and separates from the photoelectric sensor. The light of the photoelectric sensor is connected, that is, the photoelectric sensor is excited, and outputs a signal to the circuit board, indicating The tray is put into the tray and recorded by the computer; after the tray is removed, the shielding part returns to the initial position, the light of the photoelectric sensor is blocked, and a signal is also sent to the circuit board, and the tray is recorded by the computer. The information that the material tray of the position has been taken away; adopt the structure of the detection SMT material tray in and out of the material rack of the present invention, and use the shielding part made of opaque material to cooperate with the photoelectric sensor, which is deterministic; in the prior art, through The trays are matched with photoelectric sensors, and the trays used by different suppliers of materials are not made according to the same standard, which will inevitably lead to some trays being opaque, and some trays are semi-transparent or completely transparent, resulting in the current smart material It is difficult for the rack to accurately judge the pick-and-place situation of a certain feed tray position; therefore, compared with similar products in the prior art, the present invention is convenient for the intelligent rack to accurately determine the pick-and-place situation of a certain feed tray position. , to avoid the effect of loss caused by the misjudgment of the intelligent material rack.

Description of drawings

Fig. 1 is the perspective view of the embodiment of the present invention;

Fig. 2 is another perspective view of the embodiment of the present invention;

Fig. 3 is the explosion diagram of the embodiment of the present invention;

Fig. 4 is a perspective view of a support in an embodiment of the present invention;

Fig. 5 is a perspective view of a rotating member according to an embodiment of the present invention;

Fig. 6 is the schematic diagram when the structure of the embodiment of the present invention is put into the tray;

Fig. 7 is a schematic diagram when the structure of the embodiment of the present invention takes out the tray;

FIG. 8 is a schematic diagram of a structural application scenario of an embodiment of the present invention;

Fig. 9 is a left view when the structure of the embodiment of the present invention is put into the tray;

Fig. 10 is a left view when the structure of the embodiment of the present invention is taken out of the tray.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1-3, the embodiment of the present invention provides a structure that uses a photoelectric sensor to detect the entry and exit of SMT trays, including: a support 1, a circuit board 2, and n are arranged on the support 1 and can be opposite to it. A rotating rotating member 3, n photoelectric sensors 4 connected to the circuit board 2, and a shielding portion 5 provided on each rotating member. The support 1 here can be made of plastic, so it can be processed by injection molding process. Therefore, considering factors such as the maximum part size that can be processed by injection molding equipment, the rigidity and strength of the support, the support 1 of this embodiment It can be composed of several support units, and several support units are connected together to form a complete support 1; in fact, when assembling, the support 1 is connected with the circuit board 2, so each support unit is connected with the circuit board 2 are connected together to form a complete support 1, and there is no need to set a connection structure between two adjacent support units; therefore, although the support 1 needs to be fabricated in sections due to factors such as technology, it is a single piece after assembly. As a whole, it will be described as a whole.

N shielding parts 5 correspond to n photoelectric sensors 4 respectively, and the shielding parts 5 are used to shield the photoelectric sensors 4 at corresponding positions, that is to say, each photoelectric sensor 4 is all corresponding to a shielding part 5, and the shielding parts are used for Block the corresponding photoelectric sensor, therefore, the blocking part 5 needs to be made of a light-shielding material that prevents light from passing through; the photoelectric sensor 4 is located outside the movement path of the corresponding blocking part 5; n is an integer and n≥2. Obviously, because the shielding part 5 is arranged on the rotating part 3, therefore, when the rotating part 3 rotates on the supporting part 1, the shielding part 5 must rotate accordingly, and the shielding part 5 has its movement path (trajectory), and the photoelectric The sensor 4 needs to correspond to the shielding part 5, that is, the purpose of the shielding part 5 is to shield the light of the photoelectric sensor 4, therefore, the photoelectric sensor 4 cannot just be located on the movement path of the shielding part 5, but can only be located on the side of its movement path The edge can block the photoelectric sensor 4 without interfering with the movement of the blocking part 5 . "The shielding part is used to shield the corresponding photoelectric sensor", the so-called correspondence here refers to the one-to-one correspondence between the photoelectric sensor 4 of this embodiment and the shielding part 5, for example, as shown in Figure 3, the leftmost photoelectric sensor The sensor 4 and the shielding portion 5 also located on the leftmost side are a pair of components corresponding to each other.

Obviously, although this embodiment defines the number of rotating parts 3, photoelectric sensors 4 and shielding parts 5 as n, the number of the three is the same, n is an integer and n≥2; There are a lot of trays 6 stored, and one tray clamp 7 is required to store one tray 6. Therefore, the number of rotating parts 3, photoelectric sensors 4 and shielding parts 5 is often far greater than two. In practical applications, The quantity of the three is not particularly limited, and is generally customized according to the requirements of manufacturers using smart racks, as shown in Figure 6.

The photoelectric sensor 4 used in this embodiment is a commercially available standard component, which includes a receiver 401 and a transmitter 402 .

As shown in Fig. 8, the structure of the embodiment of the present invention is applied to the intelligent material rack, and the intelligent material rack includes two supporting frames 8 parallel to each other, and the structure of the present invention is arranged in one of the supporting frames 8, A number of tray clamping positions 7 are set on two supporting frames 8, each tray clamping position 7 can place a tray 6, and the tray 6 is in contact with the rotating part 3 and presses down on the rotating part 3 to make it rotate at a certain angle until the shielding portion 5 is separated from the photoelectric sensor 4 .

Compatible with the characteristics of the shielding part 5 and the photoelectric sensor 4, in this embodiment, the photoelectric sensor 4 is arranged on one surface of the circuit board 2; 201 ; the receiver 401 and the transmitter 402 of each photoelectric sensor 4 are respectively located on both sides of one of the through holes 201 . With this structure, the shielding part 5 passes through the through hole 201 during the rotation process, and in this embodiment, the shielding part 5 is located in the through hole 201 as the initial state. Therefore, each through hole 201 is not only the accommodation space for the corresponding shielding part 5, but also It is also a part of its movement path. The receiver 401 and the transmitter 402 are located on both sides of the perforation 201, that is, the photoelectric sensor 4 is located outside the movement path of the shielding part 5; obviously, in the initial state of this embodiment, the shielding part 5 blocks the For the light of the photoelectric sensor 4, when the rotating member 3 rotates with the shielding part 5, the shielding part 5 is separated from the through hole 201, and the light of the photoelectric sensor 4 will not be blocked.

Although this embodiment directly assembles n photoelectric sensors 4 on the circuit board 2, this is obviously not the only connection method. As an alternative structure, a thin plate can be set for installing n photoelectric sensors 4, and then the photoelectric sensors 4 It is connected to the circuit board 2 by electric wires. Although this structure can achieve a similar use effect, it will inevitably increase the cost and make the structure more complicated.

As shown in FIGS. 3 and 5 , specifically, the rotating member 3 includes a receiving bar 301 , an adapter plate 302 fixedly connected at one end to one end of the receiving bar, and a rotating shaft 303 at both ends movably connected to the top of the supporting member 1 ; One end of the shielding portion 5 is connected to the other end of the adapter plate 302 .

The other end of the receiving bar 301 is provided with a horizontal bar 304 perpendicular to it; the first corner is formed at the connection between the receiving bar 301 and the adapter plate 302, and the second corner is formed at the position where the adapter plate 302 is connected to the shielding part 5 ; The rotating shaft 303 is located outside the first corner and the rotating shaft 303 is perpendicular to the receiving bar 301 and the adapter plate 302 . Because when putting into tray 6, the outer side wall of tray first contacts with receiving strip 301, and the thickness dimension of tray 6 and accepting strip 301 is less, therefore needs to be matched with accepting strip 301 when putting into tray 6. It can only be put in at the rear, and setting the horizontal bar 304 is equivalent to extending the receiving bar 301 to both sides. The pressure from the tray is transmitted to the rotating member 3 to make it rotate relative to the supporting member 1 .

After the material tray 6 is removed, in order to return the rotating member 3 to the initial position, a counterweight 305 is also included, which is arranged outside the second corner and perpendicular to the shielding portion 5 and the adapter plate 302 .

Specifically, the rotating member 3 and the shielding portion 5 of this embodiment can be made of plastic, and the transverse strip 304, the receiving strip 301, the adapter plate 302, and the shielding portion 5 are integrally formed by injection molding; that is, here The shielding part 5 is actually a part of the rotating part 3, which is listed separately for easy understanding; and the integrated design is beneficial to simplify the design of the rotating part 3, facilitate one-time processing, and also reduce production costs. And easy to assemble. In particular, the rotating member 3 is also made of a light-shielding material like the shielding portion 5. The so-called light-shielding material refers to an opaque material, such as a common opaque plastic.

The shading part 5 and the adapter plate 302 are in the shape of a flat plate to reduce the weight of the rotating part 3 and save material; a dark coating (not shown) is provided on both surfaces of the shading part 5 in order to reduce ambient light Impact.

The rotating shaft 303 here is cylindrical, which is integrally formed by a large-diameter section 303a and two small-diameter sections 303b respectively arranged at both ends of the large-diameter section 303a, and the joint between the large-diameter section and the small-diameter section has a transitional arc noodle.

In view of the aforementioned reasons, the support 1 does not adopt an integrated structure, but is composed of several identical support units. For example, as shown in Figure 1-2, the support 1 here includes three support units, but the actual Above, the number of supporting units constituting the supporting member 1 is not limited.

As shown in Figures 3-4, here, what Figure 4 shows is a perspective view of one of the support units, generally, the support 1 includes a support base 101, n rotation brackets 102 arranged on the support base, and n rotation brackets 102 The horizontal connecting bar 103 that the top of the support 102 is connected; each rotating support 102 comprises two support vertical plates 102a parallel to each other, and the top of each supporting vertical plate 102a is provided with a gap 102b; n rotating supports 102 are respectively connected with n The rotating parts 3 are connected, and the two ends of each rotating shaft 303 are respectively placed in the two notches 102b of one of the rotating brackets 102 . Here, the notch 102b is arranged obliquely. The so-called oblique arrangement means that the angle a is formed between the longitudinal centerline (surface) of the notch 102b and the upper surface of the support base 101, and 0°<a<90°. During assembly, the rotating shaft 303 The two small-diameter sections 303b on the top are respectively embedded in the two gaps 102b of a certain rotating bracket 102, and the gaps 102b arranged obliquely can prevent the two ends of the synchronously rotating rotating shaft 303 from rotating relative to each other when the rotating member 3 rotates. The support 102 moves and even breaks away from the rotating support 102, which leads to inconvenient use. As shown in FIGS. 9-10 , especially when the support member 1 and the circuit board 2 are assembled, the circuit board 2 is located in front of the notch 102 b, which can prevent the two ends of the rotating shaft 303 from coming out of the notch 102 b.

The number of the rotating bracket 102 is consistent with that of the rotating member 3, and the two are also in a one-to-one correspondence.

Although the supporting member 1 of this embodiment is composed of several supporting units, it forms a whole after assembly.

The support member 1 of this embodiment is made of light-shielding material.

In order to realize the fast assembly and disassembly of the support member 1 and the circuit board 2, a hook 102c integrally formed with it is provided on the top side of each support vertical plate 102a, and correspondingly, 2n hooking gaps are provided on the top of the circuit board 2 202, the hook 102c is hooked on the top of the circuit board 2 through the hooking notch 202 at the corresponding position; the hook is located on the front side of the notch 102b, as shown in FIG. 3 .

In summary, in this embodiment, the state of the rotating member 3 when the tray clamping position 7 is not placed on the tray 6 is taken as the initial state. In this state, the shielding part 5 is located in the perforation 201, located in the receiver 401 and the transmitter Between 402, the photoelectric sensor 4 is blocked. When the tray 6 is placed in the tray clamping position 7, the side wall of the tray 6 is in contact with the receiving strip 301 and the transverse strip 304 of the rotating part 3, and the rotating part 3 is stressed. After rotating relative to the support member 1, the shielding part 5 on the rotating member 3 rotates thereupon and rotates to the outside of the perforation 201. At the same time, it is separated from the photoelectric sensor 4. The output signal indicates that the material tray 6 has been put into the material tray clamping position 7, and is recorded by the computer, as shown in Figure 6 and Figure 9; The rotating part 3 rotates in the opposite direction, and the shielding part 5 returns to the initial position, the light of the photoelectric sensor 4 is blocked, and a signal is sent to the circuit board 2, and the computer records that the tray 6 of the tray clamping position 7 has been taken away. Information, as shown in Fig. 7, Fig. 10; Adopt the structure that detects SMT feed tray of the present invention to enter and exit the rack, adopt the shielding part 5 that opaque material is made to be used for cooperating with photoelectric sensor 4, have certainty; Existing In the technology, the material tray 6 is matched with the photoelectric sensor 4, and the material trays used by different suppliers who provide materials are not made by the same standard, which will inevitably lead to some material trays being opaque, and some material trays are semi-transparent or completely transparent, thus As a result, it is difficult for the current intelligent material rack to accurately judge the loading and unloading of a certain material tray position; The loading and unloading of the tray 6 can avoid the loss caused by the misjudgment of the intelligent rack.

In the above description, it should be noted that the terms "installation", "connection", "connection" and other corresponding terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a direct connection, or an indirect connection through an intermediary, or an internal connection between two parts; "located in" should be understood as "installed on, set on", including fixed installation, movable installation and other installation methods.

Apparently, the embodiments described above are only some of the embodiments of the present invention, but not all of them. The drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be embodied in many different forms, rather, these embodiments are provided so that the understanding of the disclosure of the present invention will be more thorough. All equivalent structures made by using the contents of the description and drawings of the present invention, directly or indirectly used in other related technical fields, are also within the protection scope of the patent of the present invention.

Claims (10)

1. Use photoelectric sensor to detect SMT charging tray business turn over structure of material frame, characterized in that includes: the device comprises a support piece, a circuit board, n rotating pieces which are arranged on the support piece and can rotate relative to the support piece, n photoelectric sensors which are connected with the circuit board, and shielding parts which are arranged on each rotating piece; the n shielding parts are respectively corresponding to the n photoelectric sensors and are used for shielding the photoelectric sensors at the corresponding positions; the photoelectric sensor is positioned at the outer side of the movement path of the shielding part corresponding to the photoelectric sensor; n is an integer and n is not less than 2.

2. The structure for detecting the feeding and discharging rack of the SMT tray using the photoelectric sensor according to claim 1, wherein the supporting member is connected with the circuit board; the photoelectric sensor is arranged on one surface of the circuit board.

3. A structure for detecting an SMT tray feeding and discharging rack using a photoelectric sensor according to claim 2, wherein the photoelectric sensor comprises a receiver and a transmitter, n through holes for respectively accommodating n shielding parts are arranged in a circuit board; the receiver and the transmitter of each photoelectric sensor are respectively positioned at two sides of one perforation.

4. The structure for detecting the feeding and discharging frame of the SMT material tray by using the photoelectric sensor according to claim 2, wherein the rotating member comprises a supporting bar, an adapter plate with one end fixedly connected with one end of the supporting bar, and a rotating shaft with two ends respectively movably connected with the top of the supporting member; one end of the shielding part is connected with the other end of the adapter plate.

5. The structure for detecting the feeding and discharging rack of the SMT material tray by using the photoelectric sensor as claimed in claim 4, wherein the other end of the receiving strip is provided with a transverse strip perpendicular to the receiving strip; forming a first corner at the connection position of the receiving strip and the adapter plate, and forming a second corner at the connection position of the adapter plate and the shielding part; the rotating shaft is arranged on the outer side of the first corner and is perpendicular to the bearing strip and the adapter plate.

6. The structure of claim 5, further comprising a counterweight disposed outside the second corner and perpendicular to the shielding portion and the adapter plate.

7. The structure for detecting the feeding and discharging rack of the SMT material tray by using the photoelectric sensor according to claim 5, wherein the transverse bar, the receiving bar, the adapter plate and the shielding part are integrally formed; the shielding part is in a flat plate shape, and dark color coatings are arranged on two surfaces of the shielding part; the rotating piece and the shielding part are made of light shielding materials.

8. The structure for detecting the feeding and discharging rack of the SMT tray by using the photoelectric sensor according to claim 4, wherein the supporting member comprises a supporting base, n rotating brackets arranged on the supporting base, and a transverse connecting bar connected with the tops of the n rotating brackets; each rotating bracket comprises two mutually parallel supporting vertical plates, and the top of each supporting vertical plate is provided with a notch; the n rotating brackets are respectively connected with the n rotating pieces, and two ends of each rotating shaft are respectively placed in two notches of one rotating bracket.

9. The structure for detecting the feeding and discharging rack of the SMT material tray by using the photoelectric sensor according to claim 8, wherein the supporting base, the rotating bracket and the transverse connecting strip are integrally formed; the support piece is made of shading materials.

10. The structure for detecting the feeding and discharging rack of the SMT tray by using the photoelectric sensor according to claim 4, wherein a hook integrally formed with the supporting vertical plates is arranged on the side surface of the top of each supporting vertical plate, 2n hanging notches are formed in the top of the circuit board, and the hooks are hung on the top of the circuit board through the corresponding hanging notches; the hook is positioned at the front side of the notch.