CN116193793A - Photoelectric sensor and assembly method thereof - Google Patents

Abstract

The invention relates to the technical field of photoelectric sensors, in particular to a photoelectric sensor and an assembly method thereof, wherein a potentiometer is arranged on a first circuit board, a second circuit board is arranged vertically to the first circuit board, the first circuit board is firstly arranged, then a first knob is arranged, and then the second circuit board is arranged, so that shielding of the second circuit board to the sight is avoided when the first knob is arranged, further visual assembly of the first knob and the potentiometer is realized, an operator can clearly observe the state of matching with the first knob, the assembly accuracy of the first knob is greatly improved, meanwhile, the damage probability of the first knob or the potentiometer caused by blind assembly is greatly reduced, the assembly procedure is optimized, and the assembly efficiency is improved.

Description

Photoelectric sensor and assembly method thereof

technical field

The invention relates to the technical field of photoelectric sensors, in particular to a photoelectric sensor and an assembly method thereof.

Background technique

A photoelectric sensor, also called a reflective photoelectric switch, is a photoelectric sensor that integrates a transmitter and a receiver. When a detected object passes by, the object will reflect a sufficient amount of light emitted by the photoelectric sensor transmitter to the receiver, and the receiver will receive the light signal and output a switch control signal.

In order to adjust the sensitivity of the photoelectric sensor, an adjustable potentiometer is usually set in the photoelectric sensor, and the potentiometer is adjusted through an adjustment knob. Since the potentiometer is directly fixed on the main circuit board of the sensor, it must be installed in order to install the potentiometer. Install the main circuit board at the same time, which will cause the main circuit board to block the operator's sight when the adjustment knob is installed, so that the installation of the adjustment knob is in a state of blind installation, which often cannot be assembled successfully at one time, and the assembly efficiency is low. After many attempts to align the assembly, the probability of damage to the adjustment knob and potentiometer will increase.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, so as to provide a photoelectric sensor and an assembly method thereof.

In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

The present invention provides a photoelectric sensor, which includes: a lens bracket, which includes a bracket body; a receiving lens, where the receiving lens is installed on the bracket body; a first circuit board, which is installed on the lens bracket, the The first circuit board is located outside the bracket body; the potentiometer is installed on the first circuit board; the first knob corresponds to the position of the potentiometer; the second circuit board is located above the lens bracket, The second circuit board is perpendicular to the first circuit board.

The photoelectric sensor provided by the present invention also includes a cable buckle, and the cable buckle includes: a cable, which includes an inner wire, and a jacket surrounding the inner wire; a casing, which is integrally molded with the jacket; The internal wires pass through the casing and extend toward the inside of the casing.

The photoelectric sensor provided by the present invention also includes a housing, in which a number of first positioning columns and a number of guide plates are arranged, and a number of first positioning columns corresponding to the first positioning columns are arranged on the second circuit board. The positioning hole, the guide plate abuts against the bracket body; the housing is provided with a receiving groove for receiving the enclosure.

In the photoelectric sensor provided by the present invention, at least one side wall of the enclosure has a locking projection or a locking groove, and the inner side wall of the accommodating groove has a locking structure corresponding to the locking projection or the locking groove , the accommodating groove communicates with the inner cavity of the housing through an opening, and the internal wire extends into the inner cavity of the housing through the opening.

In the photoelectric sensor provided by the present invention, the top of the first circuit board has an upwardly extending bump, and the second circuit board has a first slot matched with the bump.

The photoelectric sensor provided by the present invention also includes a third circuit board and a fourth circuit board, the third circuit board is located above the second circuit board, and the fourth circuit board is connected to the side of the second circuit board The end face and the side end face of the third circuit board; at least one second positioning post is provided in the housing, and at least one second positioning hole corresponding to the second positioning post is provided on the second circuit board .

In the photoelectric sensor provided by the present invention, a shielding circuit board is provided between the second circuit board and the third circuit board, and a second slot matching the protrusion is provided on the shielding circuit board.

In the photoelectric sensor provided by the present invention, the shielding circuit board is an FPC, the end of which is bent and extended along the side of the second circuit board and fixed on the lower surface of the second circuit board.

The photoelectric sensor provided by the present invention further includes a copper sheet, the copper sheet is U-shaped, and includes a copper base plate and copper side plates located on both sides of the copper base plate, and the copper base plate is located below the second circuit board , the copper side plates on both sides are respectively located on both sides of the second circuit board and extend to the top of the third circuit board respectively, wherein the copper side plates on one side are located on the fourth circuit board outside.

In the photoelectric sensor provided by the present invention, the lens bracket further includes at least two elastic arms, the elastic arms extend outward from an outer wall of the bracket body, the elastic arms have a positioning portion extending inward, the The head of the positioning part has a positioning surface; the first knob has a rod-shaped main body, and the rod-shaped main body is located between the positioning surfaces of the elastic arm.

In the photoelectric sensor provided by the present invention, the side of the positioning part facing the bracket body has a first anti-retraction surface, the middle part of the rod-shaped main body has a shoulder outer ring, and the first end of the shoulder outer ring has a A second anti-retraction surface matched with the first anti-retraction surface.

The photoelectric sensor provided by the present invention further includes a cover; the cover is arranged above the housing, and a second knob is installed on the cover.

The photoelectric sensor provided by the present invention further includes a emitting lens, and the emitting lens is installed on the casing.

The present invention also provides a method for assembling a photoelectric sensor, comprising the following steps:

S1. Install the receiving lens on the bracket body, and then install the lens bracket into the housing of the sensor;

S2. Install the first circuit board on which the potentiometer is installed on the lens holder;

S3. Align and assemble the first knob through the housing with the potentiometer;

S4. Install the second circuit board into the casing, and place it above the lens bracket.

The present invention also provides a method for assembling a photoelectric sensor, comprising the following steps:

S10. Install the receiving lens on the bracket body, and then install the lens bracket into the casing along the guide plate;

S20. Install the first circuit board on which the potentiometer is installed on the lens holder;

S30. Align and assemble the first knob through the housing with the potentiometer;

S40. Pass the second circuit board through the first positioning column, and then install the second circuit board above the lens holder;

S50. Pass the third circuit board through the second positioning column, and then install the third circuit board above the second circuit board;

S60. Match the locking protrusion or the locking groove of the casing with the locking structure of the receiving groove, so as to buckle and install the cable on the housing.

In the method for assembling a photoelectric sensor provided by the present invention, the step S40 further includes: fitting the first circuit board with the second circuit board through the protrusion fitting with the first slot.

In the assembly method of the photoelectric sensor provided by the present invention, in the step S30, the first sealing ring is first fitted on the rod-shaped body of the first knob, and then the outer ring of the shoulder of the first knob is passed through The positioning surfaces of the at least two elastic arms align and assemble the first knob and the potentiometer.

The assembly method of the photoelectric sensor provided by the present invention, between the step S30 and the step S40, further includes a step S31: installing the copper sheet on the lens holder, and placing the copper base plate of the copper sheet on the The upper surface of the lens holder; in the step S40, the second circuit board is installed above the copper base plate.

In the assembly method of the photoelectric sensor provided by the present invention, the step S50 further includes the steps of:

S510. Install the shielding circuit board above the second circuit board;

S520. Connect the fourth circuit board to the side end surface of the second circuit board;

S530. Connect the side end surface of the third circuit board to the fourth circuit board.

In the method for assembling a photoelectric sensor provided by the present invention, in the step S510, the second slot of the shielded circuit board is plugged into the bump, and the end of the shielded circuit board is soldered fixed on the lower surface of the second circuit board.

In the assembly method of the photoelectric sensor provided by the present invention, in the step S520 and the step S530, the side end faces of the fourth circuit board and the second circuit board, and the side end faces of the third circuit board are all welded connect.

The assembly method of the photoelectric sensor provided by the present invention further includes step S521 between the step S520 and the step S530, protruding the first positioning post from the top of the second circuit board for thermal fusion, so that the The second circuit board is fixed in the housing; after the step S530, a step S540 is further included: protruding the second positioning post from the top of the third circuit board for thermal fusion, so that the first Three circuit boards are fixed in the casing.

In the assembly method of the photoelectric sensor provided by the present invention, the step S60 further includes: passing the internal wire through the opening and extending into the inner cavity of the housing.

The assembly method of the photoelectric sensor provided by the present invention further includes steps after the step S60:

S70. Solder the fourth circuit board, the copper side plate of the copper sheet, and the inner wire of the cable with the third circuit board respectively;

S80, filling the accommodating tank with sealant;

S90. Install the cover with the second knob on the housing, install a cover at the bottom through groove of the housing, and connect the cover, the cover and the The joints of the housing are welded.

In the assembly method of the photoelectric sensor provided by the present invention, the welding in the steps S70 and S90 is ultrasonic welding; before the step S90, it includes pre-installing the second sealing ring and the snap ring on the second knob, and The emitting lens is pre-installed in the housing by dispensing glue.

The technical scheme provided by the invention has the following advantages:

1. The photoelectric sensor provided by the present invention and its assembly method are suitable for reflective photoelectric sensors, and can also be applied to other types of photoelectric sensors, such as photoelectric transmitters or photoelectric receivers; in the past, the potentiometer was directly fixed on the main body of the sensor. On the basis of the circuit board, the first circuit board and the second circuit board are designed separately, the first circuit board is used as an adapter board, the potentiometer is installed on the first circuit board, and the second circuit board is perpendicular to the first circuit board The setting has changed the previous assembly method in which the main circuit board must be installed first and then the first knob. When the knob is turned, the second circuit board blocks the line of sight, thereby realizing the visual assembly of the first knob and the potentiometer, and the operator can clearly observe the matching state of the positioner and the first knob, which greatly improves the assembly accuracy of the first knob The rate is also greatly reduced, and the probability of damage to the first knob or potentiometer due to blind installation is also greatly reduced.

2. The photoelectric sensor and its assembly method provided by the present invention are based on the design of the first circuit board and the second circuit board, so that the assembly process of the second circuit board and the third circuit board is rearranged, so that the threading and welding of the cables The post-processing process only needs to be threaded, glued, and welded before assembling the cover, thereby optimizing the assembly process and improving assembly efficiency, avoiding the need to install circuit boards and solder cables in the early assembly, thereby The cable needs to be pulled during the entire subsequent assembly process, which is not conducive to the disadvantages of transportation on the production line.

3. In the photoelectric sensor and its assembly method provided by the present invention, the casing of the cable buckle and the cable jacket are injection molded as one, which can ensure that there is no gap between the cable and the casing, and can improve the sealing effect of the cable circumference; At least one side wall has a locking projection or a locking groove locking structure, which is suitable for matching and locking with the sensor housing, thereby improving the assembly accuracy; The cavity communicates with the inner cavity of the housing through an opening to guide the penetration of the internal wires. The interior of the accommodating groove can be completely filled with sealant and seal the opening to improve the sealing effect of the photoelectric sensor and avoid Some glues are dispensed after threading alone, and there are problems of uneven dispensing and decreased sealing performance.

4. In the photoelectric sensor and its assembly method provided by the present invention, the elastic arm is extended outside the bracket body on which the receiving lens is installed, and the first knob can be positioned directly through the positioning part of the elastic arm without separate setting A process of clamping and installing the circlip simplifies the assembly, and also saves the labor cost and material cost of making the circlip.

5. In the photoelectric sensor and its assembly method provided by the present invention, the rod-shaped main body of the first knob has a shouldered outer ring. When the shouldered outer ring passes through the positioning part, due to the larger width of the shouldered outer ring, Extrusion force is generated on the positioning part, so that the elastic arm expands outward. After the outer ring of the shoulder passes through, the elastic arm is retracted inward under the action of the elastic restoring force, thereby positioning the first knob, and the operation is simple; the positioning of the elastic arm The part has a first backstop surface, and the shoulder outer ring of the first knob has a second backstop surface matched with the first backstop surface. After the shoulder outer ring passes through the positioning part, it passes through the first backstop surface and The cooperation of the second anti-retraction surface can prevent the first knob from falling off. No matter whether the first knob is rotated or pulled by external force, the first knob will not be pulled out from the positioning part due to the blocking effect of the first anti-retraction surface.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic diagram 1 of a photoelectric sensor provided in an embodiment of the present invention;

2 is a second schematic diagram of the photoelectric sensor provided in the embodiment of the present invention;

FIG. 3 is a schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention;

FIG. 4 is a second schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention;

Fig. 5 is a schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention III;

FIG. 6 is a fourth schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention;

FIG. 7 is a schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention (5);

Fig. 8 is a schematic diagram six of the internal structure of the photoelectric sensor provided in the embodiment of the present invention;

FIG. 9 is a schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention VII;

FIG. 10 is a schematic diagram eight of the internal structure of the photoelectric sensor provided in the embodiment of the present invention;

Fig. 11 is a schematic diagram of the internal structure of the photoelectric sensor provided in the embodiment of the present invention (9);

Fig. 12 is a schematic diagram of the connection between the first circuit board and the second circuit board provided in the embodiment of the present invention;

Fig. 13 is a schematic diagram of the installation of the copper sheet and the second circuit board, the third circuit board, and the fourth circuit board provided in the embodiment of the present invention;

Fig. 14 is a first schematic diagram of the housing of the photoelectric sensor provided in the embodiment of the present invention;

Figure 15 is a second schematic diagram of the housing of the photoelectric sensor provided in the embodiment of the present invention;

Fig. 16 is a schematic diagram of a cable buckle provided in an embodiment of the present invention;

Fig. 17 is a first schematic diagram of the first knob provided in the embodiment of the present invention;

Fig. 18 is a second schematic diagram of the first knob provided in the embodiment of the present invention.

Explanation of reference signs:

1-cover, 2-housing, 21-first positioning column, 22-guide plate, 23-installation groove, 24-light hole, 25-locking groove, 26-accommodating groove, 27-second positioning column , 28-cover plate, 29-opening, 3-cable buckle, 31-shell, 311-locking protrusion, 4-receiving lens, 5-transmitting lens, 6-bracket body, 61-side rib, 62-middle Rib, 7-second circuit board, 71-first positioning hole, 72-light source, 73-first slot, 8-first knob, 81-shoulder outer ring, 811-second anti-retraction surface, 812- The second guide slope, 82-the first sealing ring, 9-the elastic arm, 91-the positioning surface, 92-the first stop surface, 93-the first guide slope, 94-the elastic lug, 10-the third circuit board, 101-second positioning hole, 11-shielding circuit board, 12-fourth circuit board, 13-copper sheet, 131-copper bottom plate, 132-copper side plate, 14-first circuit board, 141-protrusion, 15- Potentiometer, 16-the second knob, 161-the second sealing ring, 162-circlip.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example 1

This embodiment provides a photoelectric sensor. It should be noted that it is applicable to reflective photoelectric sensors, and may also be applicable to other types of photoelectric sensors, such as photoelectric transmitters or photoelectric receivers. For the convenience of introduction, this embodiment takes a reflective photoelectric sensor as an example for illustration. As shown in Figure 1-18, the photoelectric sensor includes a cover 1, a housing 2 and a cable buckle 3, the cover 1 is set on the top of the housing 2, and the cable buckle 3 is located on the side wall of the housing 2 , A sealed photoelectric sensor housing is formed by the cover 1, the housing 2 and the cable buckle 3, and other components are installed in it.

The photoelectric sensor provided by this embodiment, as shown in Figure 3, includes a lens holder, a receiving lens 4, and a transmitting lens 5, wherein the lens holder includes a holder body 6, and the receiving lens 4 is installed on the holder body 6, wherein the holder body 6 and the receiving lens 4 can be snap-in connection, for example, a buckle is provided on the edge of the receiving lens 4, and a slot corresponding to the buckle is provided on the bracket body 6, thereby realizing the bracket body 6 and the receiving lens The clamping of the lens 4; or, a buckle is set on the bracket body 6 and a corresponding slot is set on the receiving lens 4; the transmitting lens 5 is not installed in the form of bracket installation, but directly by means of dispensing. Integrating inside the shell 2 can reduce the structural complexity of the shell 2, thereby reducing the complexity of the production mold and making it easy to manufacture; of course, in other optional embodiments, the emitting lens 5 can also be installed with a bracket The means are installed in the housing 2; optionally, the overall structure of the bracket body 6 can be in the shape of a square.

It should be noted that in other types of photoelectric sensors, the setting of the lens will be different. For example, if there is only a transmitting lens in the photoelectric transmitter, it is only necessary to install the transmitting lens on the bracket body; while in the photoelectric receiver If there is only a receiving lens, it is only necessary to install the receiving lens on the bracket body.

The photoelectric sensor provided in this embodiment, as shown in Figure 6-9, its lens bracket also includes at least two elastic arms 9, and the elastic arms 9 are arranged on an outer side wall of the bracket body 6 (shown as the left side wall in Figure 6-9 side wall), the elastic arm 9 extends outward on the outer wall, the elastic arm 9 has a positioning portion extending inward, and a plurality of elastic arms 9 gather together to form an integral elastic positioning claw structure, and the inward extension refers to Elastic arm 9 extends toward gathering side; Optionally, the quantity of elastic arm 9 is two, and in other alternative embodiments, the quantity of elastic arm can be three or more; Optionally, elastic arm 9 The material of the frame can be plastic, for example, ABS plastic or PC plastic; the elastic arm 9 and the bracket body 6 can be integrally injection-molded, which can save the assembly process.

The photoelectric sensor provided in this embodiment also includes a first knob 8, a first circuit board 14 and a potentiometer 15, the potentiometer 15 can adjust the sensitivity of the sensor, the first knob 8 cooperates with the potentiometer 15, and by rotating the first Knob 8 drives potentiometer 15 to rotate, thereby realizes adjustment; As shown in Figure 7-8, the head of the positioning part of elastic arm 9 has positioning surface 91 in its gathering direction, and first knob 8 has a head and a rod-shaped The main body, the rod-shaped main body passes through the positioning surface 91 and is located between multiple positioning surfaces 91; the first circuit board 14 is located between the rod-shaped main body and the outer wall, and the potentiometer 15 is installed on the first On the circuit board 14 and facing the rod-shaped main body, the position of the potentiometer 15 corresponds to the position of the rod-shaped main body; optionally, the adjustment end of the rod-shaped main body is provided with one or more adjustment protrusions, and the position of the potentiometer 15 is An adjustment groove corresponding to the adjustment protrusion is provided. Preferably, as shown in FIG. match.

In the photoelectric sensor provided in this embodiment, the elastic arm 9 is extended outside the bracket body 6, and the first knob 8 can be positioned directly through the positioning part of the elastic arm 9, without the need for a separate clamp. The process of the spring simplifies the assembly, and also saves the labor cost and material cost of making the circlip.

In the photoelectric sensor provided in this embodiment, as shown in Figures 17-18, the rod-shaped body of the first knob 8 has a shoulder outer ring 81 with an enlarged radial width; optionally, the overall shape of the rod-shaped body It is cylindrical, and the overall shape of the shoulder outer ring 81 is also cylindrical, and the diameter of the shoulder outer ring 81 is increased relative to the rod-shaped main body; in other alternative embodiments, the rod-shaped main body and the shoulder outer ring 81 It can also be in the shape of a square cylinder, a triangular cylinder, etc.; when the shoulder outer ring 81 passes through the positioning part, because of its large width, it will generate a pressing force on the positioning part, so that the elastic arm 9 expands outward, and the convex After the shoulder outer ring 81 passes through, the elastic arm 9 is retracted inward under the action of the elastic restoring force, thereby positioning the first knob 8, and the operation is simple; and, the positioning part of the elastic arm 9 has a first backstop surface 92, the second The first end of the shouldered outer ring 81 of a knob 8 has a second backstopping surface 811 matched with the first backstopping surface 92, and the shouldered outer ring 81 passes through the first backstopping surface after passing through the positioning part. 92 and the second anti-retraction surface 811 can prevent the first knob 8 from falling off. No matter whether the first knob 8 is rotated or pulled by an external force, it will not be pulled from the positioning part due to the blocking effect of the first anti-retraction surface. pull out.

The photoelectric sensor provided by this embodiment, as shown in Figure 6, 11-12, also includes a second circuit board 7, the second circuit board 7 is perpendicular to the first circuit board 14, and the first circuit board The top of 14 has a protrusion 141 extending upwards, and the second circuit board 7 has a first slot 73 matched with the protrusion 141; The positioning between the first circuit board 14 and the second circuit board 7; Compared with the existing method of directly installing the potentiometer on the second circuit board, in this embodiment, the second circuit board 7 is separately arranged. Vertical first circuit board 14 is installed potentiometer 15, and first circuit board 14 has played the effect of adapter board substantially, thus, in assembly process, can first assemble first circuit board 14 and potentiometer 15, and then Install the first knob 8 again. At this time, there is no second circuit board at the top to block the line of sight. The first knob 8 can be assembled with the potentiometer 15 in a visualized state. After the first knob 8 is assembled, the second The second circuit board 7 is assembled; the above-mentioned assembly method avoids the disadvantages of blind installation that need to install the whole second circuit board and potentiometer first, and then install the first knob, and the operator can clearly observe the cooperation between the positioner and the first knob state, which greatly improves the assembly accuracy of the first knob, and also greatly reduces the probability of damage to the first knob or potentiometer due to blind assembly.

Because in the photoelectric sensor, there are many electrical components such as chips that need to be installed, if they are all mounted on the second circuit board, it will be too crowded, and even if the area of the second circuit board is designed to be larger in order to avoid crowding, in this case It will also lead to an unreasonable increase in the overall size of the photoelectric sensor. The reflective photoelectric sensor provided by the present invention, as shown in Figure 4-5, also includes a third circuit board 10, and the third circuit board 10 is located in the second circuit Above the board 7, specifically, the third circuit board 10 is arranged in parallel above the second circuit board 7; a separate third circuit board 10 is arranged above the second circuit board 7, under the premise of occupying as little space as possible Equipped with more components, a layer of circuit board is added in the height direction, and does not take up too much space in the length or width direction, making the overall size of the sensor compact and small. Of course, those skilled in the art can understand that the third circuit board is not necessary, and the third circuit board may not be provided when the second circuit board can meet the loading requirements.

The photoelectric sensor provided by this embodiment also includes a fourth circuit board 12. As shown in FIG. Side surface; the fourth circuit board 12 is used as a connecting board to electrically connect the second circuit board 7 and the third circuit board 10 to realize the circuit communication between the second circuit board 7 and the third circuit board 10 . It should be noted that, if the third circuit board 10 does not need to be provided, correspondingly, the fourth circuit board 12 does not need to be provided.

The photoelectric sensor provided in this embodiment, as shown in Figure 16, the cable buckle includes a cable 32 and a casing 31, the cable 32 includes an inner wire and a jacket surrounding the inner wire, and the casing 31 and the jacket are injection molded as one , the internal wires pass through the enclosure 31 and extend toward the inside of the enclosure 31; as shown in FIG. At least one side wall of the casing 31 has a locking protrusion 311, and the inner side wall of the accommodating groove 26 has a locking groove 25 corresponding to the locking protrusion 311, thereby improving the assembly accuracy; In an alternative embodiment, a locking groove may also be provided on the side wall of the enclosure 31 , and a locking protrusion may be provided on the inner side wall of the accommodating groove 26 . The accommodating groove 26 communicates with the inner cavity of the housing 2 through an opening 29 , and the internal wire extending to the inner side of the enclosure 31 extends into the inner cavity of the housing 2 through the opening 29 . The accommodating groove 26 is filled with sealant, and the sealant blocks the opening 29 . The accommodating groove 29 is a separate cavity, which communicates with the inner cavity of the housing 2 through an opening 29 to guide the penetration of the internal wires. The inside of the accommodating groove 26 can be completely filled with sealant and seal the opening 29 , Improve the sealing effect of the photoelectric sensor. It also avoids the problems of uneven glue dispensing and decreased sealing performance in the existing separate threading and glue dispensing.

For the photoelectric sensor provided in this embodiment, as shown in Figure 3-5, a shielding circuit board 11 is provided between the second circuit board 7 and the third circuit board 10, specifically, the shielding of the shielding circuit board 11 The plane is arranged in parallel between the second circuit board 7 and the third circuit board 10, which is used to shield the signal interference between the second circuit board 7 and the third circuit board 10; the shielding The circuit board 11 is provided with a second slot matched with the bump 141, thereby facilitating the positioning and installation of the shielded circuit board 11; optionally, the shielded circuit board 11 can be an FPC, which has a better bending Its end is bent and extended along the side of the second circuit board 7 and fixed on the lower surface of the second circuit board 7, so that the installation and fixation of the shielding circuit board 11 is better realized, wherein the FPC The end of the FPC can be fixed on the lower surface of the second circuit board 7 by welding; in other optional embodiments, the end of the FPC can also be fixed on other positions of the second circuit board 7, for example, the second circuit board 7 The upper surface or side of the plate 7 and other positions. It should be noted that, if the third circuit board 10 does not need to be provided, correspondingly, the shielding circuit board 11 does not need to be provided.

The photoelectric sensor provided in this embodiment, as shown in Figure 3-4, the reflective photoelectric sensor also includes a copper sheet 13, specifically, as shown in Figure 13, the copper sheet 13 is U-shaped, which includes a copper base plate 131 and copper side plates 132 on both sides of the copper base plate 131, the copper base plate 131 is located below the second circuit board 7, and the copper side plates 132 on both sides are respectively located on the second circuit board 7 and extend to the top of the third circuit board 10 respectively, wherein the copper side plate 132 on one side is located outside the fourth circuit board 12, and the copper sheet 13 serves as the second circuit board 7 and The shielding plate of the third circuit board 10 can prevent the second circuit board 7 and the third circuit board 10 from being subjected to external electromagnetic interference.

In the photoelectric sensor provided in this embodiment, as shown in Figures 7-8, the positioning surface 91 of the elastic arm 9 is an inner concave surface extending axially along the rod-shaped main body, and the inner concave surface is in contact with the outer ring 81 of the shoulder. To ensure that the shoulder outer ring 81 can pass through the inner concave surface smoothly; optionally, when the shoulder outer ring 81 is cylindrical, the inner concave surface can be designed as an arc surface.

In the photoelectric sensor provided in this embodiment, as shown in FIG. 8 , the positioning portion of the elastic arm 9 also has a first guide inclined surface 93 extending from the positioning surface 91 to the side facing away from the bracket body 6 . The second end of the shoulder outer ring 81 has a second guide slope 812 matched with the first guide slope 93 , the design of the guide slope can make it easier for the shoulder outer ring 81 to pass through the positioning portion.

In the photoelectric sensor provided in this embodiment, as shown in Figure 6-9, its elastic arm 9 is provided with an outwardly extending elastic lug 94, that is, the elastic lug 94 extends toward the expansion side of the elastic arm 9, and the elastic lug 94 can Abut against the inner wall of the housing 2, thereby providing a certain elastic support force for the elastic arm 9; optionally, the material of the elastic lug 94 can be plastic, such as ABS plastic or PC plastic; the elastic arm 9 and the elastic lug 94 can be integrally injection-molded to facilitate assembly; the shape of the elastic arm 9 can be a hook shape, a straight line shape, a wave shape, etc.

The photoelectric sensor provided in this embodiment, as shown in Figure 6-7, has a limiting surface for limiting the first circuit board 14 at the root of its elastic arm 9, and an inverted surface is also provided on the top of the limiting surface. angle, so as to facilitate the installation of the first circuit board 14; the outer wall of the bracket body 6 is provided with at least two side ribs 61, and the side ribs 61 abut against the first circuit board 14 and are connected to the The limiting surfaces are oppositely arranged, and the first circuit board 14 is interposed between the limiting surface and the side rib 61 , and the effective positioning of the first circuit board 14 is realized through the limiting surface and the side rib 61 .

The photoelectric sensor provided in this embodiment is also provided with at least one intermediate rib 62 on the outer wall of the bracket body 6, the intermediate rib 62 is located between the side ribs 61, and the position of the intermediate rib 62 is consistent with the The position of the potentiometer 15 corresponds, wherein, as shown in FIG. 9 , the protruding depth of the middle rib 62 is smaller than the protruding depth of the side rib 61; In the process of turning the first knob 8 to adjust the potentiometer 15, etc., it is inevitable that a certain extrusion force will be generated on the first circuit board 14, and the difference in the protruding depth between the side rib 61 and the middle rib 62 can allow the first Circuit board 14 produces certain deflection buffer under the effect of extruding force, avoids that first circuit board 14 is stressed and is damaged; Optionally, first circuit board 14 can be FPC, can allow certain degree like this deformation, and facilitate the assembly and cooperation with other components; optionally, the number of the middle rib 62 is one, and the number of side ribs 61 is two, and the two side ribs 61 are respectively located on both sides of the middle rib.

In the photoelectric sensor provided in this embodiment, both the side ribs 61 and the middle rib 62 extend longitudinally along the outer wall, and the ends of the side ribs 61 and the middle rib 62 are arc-shaped, so as to be consistent with the first A circuit board 14 forms a line contact. Compared with a surface contact, the line contact can facilitate the installation of the first circuit board 14 .

The photoelectric sensor provided by this embodiment, as shown in Figure 14, is provided with several first positioning columns 21, at least one second positioning column 27, and several guide plates 22 in the housing 2, and the first positioning column 21 passes through the first positioning column. Two circuit boards 7, the second positioning column 27 passes through the third circuit board 10, the second circuit board 7 is provided with the first positioning hole 71 corresponding to the first positioning column 21, through the first positioning column 21 and the first The positioning hole 71 realizes the assembly guide and positioning of the second circuit board 7, and the third circuit board 10 is provided with a second positioning hole 101 corresponding to the second positioning column 27, through which the second positioning column 27 and the second positioning hole 101 realizes the assembly guidance and positioning of the third circuit board 10, and the guide plate 22 abuts against the bracket body 6 to realize the assembly guidance and positioning of the bracket body 6; wherein, the first positioning column 21, the second positioning column 27 They are all hot-melt posts, which play the role of guiding and positioning on the one hand. On the other hand, after the second circuit board 7 and the third circuit board 10 are installed, the first positioning post 21 and the second positioning post 27 are heated. Melt to realize the fixation between the first positioning post 21, the second positioning post 27 and the housing; The assembly accuracy between the circuit board 8 and the lens holder avoids errors; optionally, the number of the first positioning posts 21 and the first positioning holes 71 is three, and two of the first positioning holes 71 are located in the second circuit Both ends of one side of the board 7 form a triangular distribution structure with a first positioning hole 71 located in the middle of the other side of the second circuit board 7, thereby forming a stable positioning; optionally, the second positioning column 27 and There is one second positioning hole 101, which is located at a corner of the third circuit board 10. Since the second circuit board 7 has been stably fixed, the third circuit board 10 is connected to the second circuit board 7 through the fourth circuit board 12. , therefore, the third circuit board 10 can realize guiding and positioning by using one positioning hole; optionally, the number of guiding plates 22 is four, which are respectively arranged at the four corners inside the housing 2 . It should be noted that, in the case where the third circuit board 10 does not need to be provided, correspondingly, the second positioning hole and the second positioning post do not need to be provided.

In the photoelectric sensor provided in this embodiment, as shown in FIG. 12, a light source 72 corresponding to the emitting lens 5 is installed on the lower surface of the second circuit board 7. As shown in FIG. 14, the housing 2 is provided with a The installation slot 24 for accommodating the light source 72 is provided with a light hole 24 for the light of the light source 72 to pass through. Of course, those skilled in the art can know that in photoelectric sensors such as photoelectric transmitters or photoelectric receivers, there will be differences in the setting of light sources. For example, in photoelectric transmitters, the positions of light sources, installation grooves, and optical holes need to be Adaptive adjustment is made corresponding to the position of the transmitting lens, and in the photoelectric receiver, there is no need to set a light source, installation groove, and light hole.

The photoelectric sensor provided by this embodiment, as shown in Figure 2, is equipped with a second knob 16 on the cover body 1, and the second knob 16 is used as a function switching knob to output the state of the sensor when it receives a signal and when it receives a signal. When the signal is received, switch between the closed state; the outside of the second knob 16 is clamped with a retaining spring 161 .

In the photoelectric sensor provided in this embodiment, a first sealing ring 82 is provided outside the rod-shaped main body of the first knob 8, and a second sealing ring 162 is provided outside the shaft of the second knob 16, thereby ensuring the sealing effect of the sensor; The bottom of the housing 2 is provided with a through groove, and a cover plate 28 is installed on the through groove, so as to facilitate the assembly of the internal parts of the housing. The cover plate 28 is welded and sealed in the later stage of assembly.

Example 2

On the basis of the structure of the photoelectric sensor in Embodiment 1, this embodiment provides a photoelectric sensor assembly method. It should be noted that it is applicable to reflective photoelectric sensors, and can also be applied to other types of photoelectric sensors, such as photoelectric emission device or photoelectric receiver, etc. For the convenience of introduction, this embodiment takes a reflective photoelectric sensor as an example for illustration.

Described assembly method comprises the steps:

S10, install the receiving lens 4 on the bracket body 6, and then install the lens bracket into the housing 2 along the guide plate 22;

S20, installing the first circuit board 14 on which the potentiometer 15 is installed on the lens holder;

S30, passing the first knob 8 through the housing 2 and aligning and assembling the potentiometer 15;

S40, passing the second circuit board 7 through the first positioning column 21, and then installing the second circuit board 7 above the lens bracket;

S50, passing the third circuit board 10 through the second positioning column 27, and then installing the third circuit board 10 above the second circuit board 7;

S60 , match the locking protrusion or the locking groove of the casing 31 with the locking structure of the accommodating groove 26 , so as to install the cable buckle 3 on the housing 2 .

The assembly method of the reflective photoelectric sensor provided in this embodiment has changed the previous assembly method in which the potentiometer is directly fixed on the main circuit board of the sensor, and the main circuit board must be installed first, and then the first knob must be installed. The first circuit board, then install the first knob, and then install the second circuit board, to avoid the second circuit board blocking the line of sight when installing the first knob, and then realize the visual assembly of the first knob and the potentiometer, and the operator can Clearly observe the matching state of the locator and the first knob, which greatly improves the assembly accuracy of the first knob, and also greatly reduces the damage probability of the first knob or potentiometer due to blind installation; and, based on the first The design of the circuit board and the second circuit board, so that the assembly process of the second circuit board and the third circuit board is rearranged, so that the cable threading and welding processes are rearranged, and only threading and dispensing are required before the cover is assembled , Welding process, thereby optimizing the assembly process, improving assembly efficiency, avoiding the need to install circuit boards and solder cables in the early assembly, so that cables need to be pulled during the entire subsequent assembly process, which is not conducive to Disadvantages of conveying on the production line.

Optionally, the step S40 further includes: fitting the first circuit board 14 with the second circuit board 7 through the protrusion 141 mating with the first slot 73 .

Optionally, in the step S30, the first sealing ring 82 is fitted on the rod-shaped body of the first knob 8, and then the shoulder outer ring 81 of the first knob 8 is passed through the The positioning surfaces 91 of at least two elastic arms 9, and then align and assemble the first knob 8 and the potentiometer 15; specifically, the operator can directly observe the positioner 15 and the first knob 8 from above Align the cross-shaped adjustment protrusion of the first knob 8 with the cross-shaped adjustment groove of the potentiometer 15, and then rotate a certain angle after alignment to ensure that the assembly is in place.

Optionally, in step S10, the elastic lug 94 of the lens holder abuts against the inner wall of the housing 2, thereby providing a certain elastic supporting force for the elastic arm 9, and in step S30, the first knob passes through all the elastic arms. When the positioning surface is mentioned above, the elastic lug 94 can make the elastic arm 9 rebound quickly to realize positioning.

Optionally, in step S20, the first circuit board 7 is inserted between the limiting surface and the side rib 61 along the limiting surface at the root of the elastic arm 9, so that the first circuit board 14 is positioned between the limiting surface and the side rib 61. The installation and positioning on the above-mentioned lens holder.

Optionally, between the step S30 and the step S40, a step S31 is also included: installing the copper sheet 13 on the lens holder, and the copper base plate 131 of the copper sheet 13 is placed on the lens holder the upper surface of the upper surface; in the step S40, the second circuit board 7 is installed above the copper base plate 131 .

Optionally, said step S50 further includes the steps of:

S510, installing the shielding circuit board 11 above the second circuit board 7;

S520. Connect the fourth circuit board 12 to the side end surface of the second circuit board 7;

S530. Connect the side surface of the third circuit board 10 to the fourth circuit board 12 .

Optionally, in the step S510, insert the second slot of the shielded circuit board 11 into the bump 141, and fix the end of the shielded circuit board 11 on the The lower surface of the second circuit board 7 is described.

Optionally, in the step S520 and the step S530, the fourth circuit board 12 is connected to the side end surface of the second circuit board 7 and the side end surface of the third circuit board 10 by welding.

Optionally, step S521 is further included between the step S520 and the step S530, protruding the first positioning column 21 from the top end of the second circuit board 7 for thermal melting, so that the second circuit board 7 The circuit board 7 is fixed in the housing 2; after the step S530, a step S540 is also included, wherein the second positioning post 27 is protruded from the top of the third circuit board 10 for thermal fusion, so that the The third circuit board 10 is fixed in the housing 2 .

Optionally, the step S60 further includes: passing the internal wire through the opening 29 and extending into the inner cavity of the housing 2 .

Optionally, in the step S60, specifically, the locking protrusion 311 of the casing 31 is matched with the locking groove 25 of the accommodating groove 26, so that the cable buckle 3 is installed on the In an alternative embodiment, the locking groove of the casing 31 can also be used to match the locking protrusion of the accommodating groove 26 .

Optionally, after the step S60, the step further includes:

S70, welding the fourth circuit board 12, the copper side plate 132 of the copper sheet 13, and the inner wire of the cable 32 to the third circuit board 10 respectively;

S80, filling the accommodating groove 26 with sealant;

S90. Cover the cover body 1 equipped with the second knob 16 on the casing 2, install a cover plate 28 at the bottom through groove of the casing 2, and place the cover body 1 , The joint between the cover plate 28 and the housing 2 is welded.

Optionally, the welding in the steps S70 and S90 is ultrasonic welding; before the step S90, the second knob 16 can be pre-installed with the second sealing ring 162 and the snap ring 161, and the pre-installation process can be It is operated in parallel with the steps before the step S90; in addition, before the step S90, it also includes pre-installing the emitting lens 5 in the housing 2 by dispensing, and this process can also be combined with the The steps before step S90 are operated in parallel, and can be operated flexibly according to the actual situation of the production line.

Optionally, in step S90, before performing ultrasonic welding, use an air gun to blow away the dust in the inner cavity of the casing, especially the dust attached to the transmitting lens and the receiving lens. Since ultrasonic welding is the last step of sealing the sensor, it should be Ensure the cleanliness of the interior, thereby ensuring the accuracy of the sensor.

It should be noted that, in the above steps, for some types of photoelectric sensors, the third circuit board 10 is not necessary, and when the second circuit board 7 can meet the loading requirements, the third circuit board may not be provided. In this case Next, there is no need for the step S50 of installing the third circuit board, nor for the steps S510 and S520 of installing the shielded circuit board and the fourth circuit board. In the subsequent step S70, the copper side plate of the copper sheet and the inner wire of the cable are welded on the second circuit board 7 .

It should be noted that in other types of photoelectric sensors, the setting of the lens will be different. For example, if there is only a transmitting lens in the photoelectric transmitter, it is only necessary to install the transmitting lens on the bracket body; while in the photoelectric receiver If there is only a receiving lens, it is only necessary to install the receiving lens on the bracket body. Therefore, when the above steps are applicable to photoelectric transmitters or photoelectric receivers, the installation of the lens needs to be adjusted adaptively, and only one transmitting lens or receiving lens needs to be installed. For example, for the photoelectric transmitter, in step S10 , the transmitting lens is installed on the bracket body; for the photoelectric receiver, in step S10, the receiving lens is installed on the bracket body.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (25)

1. A photoelectric sensor, comprising:

a lens holder including a holder body;

the receiving lens is arranged on the bracket body;

a first circuit board mounted on the lens holder, the first circuit board being located outside the holder body;

the potentiometer is arranged on the first circuit board;

a first knob corresponding to the potentiometer position;

and the second circuit board is positioned above the lens bracket and is perpendicular to the first circuit board.

2. The optoelectronic sensor of claim 1, further comprising a cable clasp comprising:

a cable comprising an inner conductor and a jacket surrounding the inner conductor;

A capsule injection molded integrally with the outer jacket; the inner lead penetrates through the sealing shell and extends to the inner side of the sealing shell.

3. The photoelectric sensor according to claim 2, further comprising a housing, wherein a plurality of first positioning columns and a plurality of guide plates are arranged in the housing, a plurality of first positioning holes corresponding to the first positioning columns are formed in the second circuit board, and the guide plates are abutted with the bracket body; the shell is provided with a containing groove for containing the envelope.

4. A photoelectric sensor according to claim 3, wherein at least one side wall of the enclosure has a locking projection or a locking groove, and the inner side wall of the receiving groove has a locking structure corresponding to the locking projection or the locking groove, and the receiving groove communicates with the inner cavity of the housing through an opening through which the inner wire extends into the inner cavity of the housing.

5. The photosensor of claim 4, wherein the top of the first circuit board has an upwardly extending tab and the second circuit board has a first slot that mates with the tab.

6. The photosensor according to claim 5, further comprising a third circuit board and a fourth circuit board, the third circuit board being located above the second circuit board, the fourth circuit board being connected to a side end face of the second circuit board and a side end face of the third circuit board; at least one second positioning column is arranged in the shell, and at least one second positioning hole corresponding to the second positioning column is formed in the second circuit board.

7. The photoelectric sensor of claim 6, wherein a shielding circuit board is disposed between the second circuit board and the third circuit board, and a second slot is disposed on the shielding circuit board and is matched with the bump.

8. The photoelectric sensor according to claim 7, wherein the shielding circuit board is an FPC, and a distal end thereof is bent and extended along a side surface of the second circuit board and fixed to a lower surface of the second circuit board.

9. The photoelectric sensor of claim 8, further comprising a copper sheet, wherein the copper sheet is U-shaped and comprises a copper bottom plate and copper side plates positioned at two sides of the copper bottom plate, wherein the copper bottom plate is positioned below the second circuit board, the copper side plates at two sides are respectively positioned at two sides of the second circuit board and respectively extend to the upper side of the third circuit board, and wherein the copper side plate at one side is positioned at the outer side of the fourth circuit board.

10. The photoelectric sensor of claim 9, wherein the lens holder further comprises at least two elastic arms extending outwardly from an outer sidewall of the holder body, the elastic arms having inwardly extending positioning portions, the positioning portion heads having positioning surfaces; the first knob is provided with a rod-shaped main body, and the rod-shaped main body is positioned between the positioning surfaces of the elastic arms.

11. The photoelectric sensor of claim 10, wherein a side of the positioning portion facing the bracket body has a first retaining surface, the middle portion of the rod-shaped body has a shoulder outer ring, and a first end of the shoulder outer ring has a second retaining surface that mates with the first retaining surface.

12. The photosensor according to claim 11, further comprising a cover; the cover body is covered and arranged above the shell body, and a second knob is arranged on the cover body.

13. The photosensor according to claim 12, further comprising an emitter lens mounted on the housing.

14. A method of assembling a photoelectric sensor according to claim 1, comprising the steps of:

S1, mounting the receiving lens on the bracket body, and then mounting the lens bracket into a shell of a sensor;

s2, mounting the first circuit board provided with the potentiometer on the lens bracket;

s3, enabling the first knob to penetrate through the shell and be aligned and assembled with the potentiometer;

and S4, mounting the second circuit board into the shell and placing the second circuit board above the lens bracket.

15. A method of assembling a photoelectric sensor according to claim 13, comprising the steps of:

s10, mounting the receiving lens on the bracket body, and then mounting the lens bracket into the shell along the guide plate;

s20, mounting the first circuit board provided with the potentiometer on the lens bracket;

s30, enabling the first knob to penetrate through the shell and be aligned and assembled with the potentiometer;

s40, enabling the second circuit board to pass through the first positioning column, and then installing the second circuit board above the lens bracket;

s50, the third circuit board passes through the second positioning column, and then the third circuit board is installed above the second circuit board;

And S60, matching the locking convex blocks or the locking grooves of the sealing shell with the locking structures of the containing grooves, so that the cable is buckled and mounted on the shell.

16. The method of assembling as claimed in claim 15, wherein said step S40 further comprises: the first circuit board and the second circuit board are spliced by matching the convex blocks with the first slots.

17. The assembling method according to claim 15, wherein in the step S30, a first sealing ring is first sleeved on the rod-shaped main body of the first knob, and then the shoulder outer ring of the first knob passes through the positioning surfaces of the at least two elastic arms, so that the first knob and the potentiometer are assembled in alignment.

18. The method of assembling of claim 15, further comprising step S31 between said step S30 and said step S40: mounting the copper sheet on the lens support, wherein a copper bottom plate of the copper sheet is arranged on the upper surface of the lens support; in the step S40, the second circuit board is mounted above the copper base plate.

19. The method of assembling as claimed in claim 18, wherein said step S50 further comprises the steps of:

S510, mounting the shielding circuit board above the second circuit board;

s520, connecting the fourth circuit board to the side end surface of the second circuit board;

and S530, connecting the side end surface of the third circuit board with the fourth circuit board.

20. The assembly method according to claim 19, wherein in the step S510, the second slot of the shielding circuit board is plugged into the bump, and the end of the shielding circuit board is fixed to the lower surface of the second circuit board by soldering.

21. The method according to claim 19, wherein in step S520 and step S530, the fourth circuit board is soldered to the side end surface of the second circuit board and the side end surface of the third circuit board.

22. The assembly method according to claim 19, further comprising a step S521 of heat-fusing the first positioning post protruding from the top end of the second circuit board to fix the second circuit board in the housing between the step S520 and the step S530; step S540 is further included after step S530, in which the second positioning post protrudes from the top end of the third circuit board to perform heat fusion, so as to fix the third circuit board in the housing.

23. The method of assembling as claimed in claim 19, wherein said step S60 further comprises: the inner wire is passed through the opening and extends into the interior cavity of the housing.

24. The method of assembling as claimed in claim 23, wherein said step S60 further comprises the steps of:

s70, respectively welding the fourth circuit board, the copper side plate of the copper sheet and the inner lead of the cable with the third circuit board;

s80, filling sealant into the accommodating groove;

and S90, covering the cover body provided with the second knob on the shell, installing a cover plate at the bottom through groove of the shell, and welding the connection parts of the cover body, the cover plate and the shell.

25. The method of assembly of claim 24, wherein the welding in steps S70 and S90 is ultrasonic welding; before the step S90, the method includes pre-installing a second sealing ring and a clamping spring on the second knob, and pre-installing the emission lens in the shell by dispensing.

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