Switch pin for Press-fit multi-terminal crimping process and crimping equipment

Abstract

The utility model discloses a switch pin used for a Press-fit multi-terminal crimping process, which is characterized in that the switch pin comprises an abutting section, an elastic section and a detection section which are connected in sequence, the abutting section is used for abutting a fisheye terminal, the detection section comprises a detection window, the detection window has a height H, and the detection window is used for transmitting a detected optical signal. The utility model also discloses a crimping device using the above switch pin. According to the utility model, the switch signal pin is pre-embedded in the existing pressing block. Under the condition that terminals are lacked or few, the equipment can detect signals and give out an alarm prompt. Therefore, the problem that in the prior art, when multiple terminals are inserted at the same time, terminal missing and terminal lacking cannot be detected only through force-displacement monitoring is solved. And the risk that defective products flow to the next work station or even the client is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of connectors, in particular to a switch pin used in a Press-fit multi-terminal crimping process and a crimping device provided with the switch pin. Background Art

[0002] In order to avoid possible adverse conditions during the assembly process, the existing Press-fit process detects whether there are missing or insufficient terminals when inserting the terminals.

[0003] The prior art uses a pressure sensor and a displacement sensor or an integrated sensor to detect and draw a force-displacement curve when the terminal is inserted. The pressing block is only a part of the force to be borne during the crimping process.

[0004] When multiple terminals are inserted at the same time, the missing or insufficient terminals may not be identified, and the defective products may be judged as qualified products and flow to the next workstation or even the client, making it impossible to effectively control the crimping process.

[0005] Due to the working principle of press-fit and electrical signal detection method based on force-displacement curve, the above problems cannot be avoided by using force-displacement detection method. In the force-displacement detection curve method, the number of inserted terminals, force, and displacement have the following relationship:

[0006] The force when inserting a single terminal is generally 50N to 80N, and the force when inserting m (m≥3) terminals is in the range of 50mN to 80mN. At this time, if only m-1 terminals are inserted and another terminal is missing, the upper limit of the insertion force is (80m-80)N, which may be greater than the set threshold of 50mN. As a result, it may not be possible to identify missing terminals or insufficient terminals, and it is not possible to fully detect all failure modes.

[0007] Moreover, the switch needle using electrical signals as carriers can only detect the minimum extension length, but cannot detect the situation where the fisheye terminal is pressed out too long. Moreover, this solution is a purely qualitative detection method, and it is impossible to know the specific extension length of the terminal. Therefore, it can be seen that the existing technology cannot achieve high-precision monitoring when inserting multiple terminals. Utility Model Content

[0008] In order to overcome the above technical defects, the purpose of the utility model is to provide a switch needle for use in a Press-fit multi-terminal crimping process and a crimping device provided with the switch needle.

[0009] The utility model discloses a switch needle for a Press-fit multi-terminal crimping process, comprising: an abutment section, an elastic section and a detection section connected in sequence, the abutment section is used to abut against a fisheye terminal, the detection section comprises a detection window, the detection window has a height H, and the detection window is used to transmit a detection light signal.

[0010] Furthermore, the detection window is in a rectangular shape, with a height H=2b, where b is the tolerance of the length of the terminal pressed out of the PCB.

[0011] Furthermore, the switch needle is made of metal material, and corrosion resistance treatment is performed on its surface.

[0012] The utility model also discloses a crimping device using the switch pin, which is characterized by comprising a crimping platform and a PIN pin; one end of the PIN pin is arranged on the connector, and the other end of the PIN pin is provided with a fisheye terminal.

[0013] The PCB board is provided with a fisheye terminal hole for the fisheye terminal to be inserted and fixed;

[0014] The crimping platform includes a fixture, a pressing block, a driving device, a detection laser, a pressure sensor and a servo encoder; the switch needle is arranged in the pressing block; the PCB board is placed on the fixture and is located above the connector, the driving end of the driving device is connected to the pressing block through a connecting rod and is aligned with the PCB board and the connector, and the driving device is used to drive the pressing block to move up and down for crimping or return to an initial position; the pressure sensor is used to monitor the crimping force, and the servo encoder is used to monitor the displacement during the crimping process; the detection laser includes a transmitting end and a receiving end, and the transmitting end and the receiving end are arranged at both ends of the pressing block.

[0015] Furthermore, the height of the laser emitting end is equal to the height of the laser receiving end.

[0016] Furthermore, the height from the center of the detection window of the switch needle to the laser emission end is a, wherein a is the distance that the press-fit terminal defined by the product protrudes from the PCB surface after being crimped.

[0017] Furthermore, the detection laser may also be replaced by camera detection.

[0018] Compared with the prior art, the above technical solution has the following beneficial effects:

[0019] The present application adopts the method of pre-embedding switch signal pins in the existing pressing block. In the case of missing terminals or insufficient terminals, the equipment can detect the signal and issue an alarm prompt. This solves the problem of missing terminals or insufficient terminals that cannot be detected by force-displacement monitoring when multiple terminals are inserted simultaneously in the existing process technology. The risk of defective products flowing to the next workstation or even the client is avoided. The corresponding number of switch signal pins can be pre-embedded according to the number of plugged terminals, thereby realizing the control of each terminal during the crimping process. Zero defects of the product are guaranteed. At the same time, the signal of the switch pin in this application is detected by optical signal, rather than traditional electrical signal detection, which can achieve higher-precision monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the Press-fit multi-terminal crimping process in the prior art;

[0021] Figure 2 It is a schematic diagram of the crimping process of the switch pin of the present application being arranged in the pressing block;

[0022] Figure 3 A detailed structural diagram of a specific embodiment of a switch needle of the present application;

[0023] Figure 4 It is a structural schematic diagram of the crimping equipment of this application;

[0024] Figure 5 A schematic diagram of using the elastic switch needle of the present application in a crimping process;

[0025] Figure 6 This is a schematic diagram of replacing the laser instrument disclosed in the present invention with camera detection.

[0026] Reference numerals:

[0027] 1. Switch needle; 11 abutment section; 12 detection section; 121 detection window; 2 crimping equipment DETAILED DESCRIPTION

[0028] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0030] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0032] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and they themselves have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0035] At present, the industry mainly uses force-displacement curve monitoring for press-fit crimping. However, the insertion force of a terminal is generally 50-80N. In order to save efficiency, 3 or even more terminals will be inserted together. According to the results of a single terminal, when 3 terminals are inserted at the same time, the insertion force will normally be 150-240N. At this time, if only 2 terminals are inserted and the other terminal is missing, the insertion force will not necessarily alarm. Because at this time, the insertion force of the two terminals may be 160N, which is still within the normal insertion force range of 3 terminals. Therefore, this failure mode will not necessarily be identified.

[0036] See also Figure 1 This is a schematic diagram of the Press-fit multi-terminal crimping process of the prior art. In the prior art, the press block is only used as a part of the force bearing during the crimping process. Process monitoring is only achieved through the crimping curve. However, in the multi-terminal crimping process, the crimping curve cannot 100% detect all failure modes. For example, in the figure, the third terminal (from left to right) should be judged as defective, but in the existing monitoring equipment, it will still be judged as qualified, resulting in defective products not being detected.

[0037] See also Figure 2 This is a schematic diagram of the crimping process in which the switch pin of the present application is provided in the pressing block. Based on the prior art, the design of the pressing block is improved, and an elastic switch pin is pre-embedded in the pressing block. If the press-fit terminal is not pressed out during the product crimping process, the switch pin will not be compressed, that is, no signal can be detected. At this time, the equipment will alarm and the product will be judged as defective.

[0038] See also Figure 3 : This is a detailed structural diagram of a specific embodiment of the switch needle of the present application. The switch needle 1 includes an abutting section 11, an elastic section (not shown) and a detection section 12 connected in sequence. The abutting section 11 is used to abut the fisheye terminal. The detection section 12 includes a detection window 121. The detection window 121 has a height H. The detection window 121 is used to transmit the detection light signal. In this embodiment, the detection window 121 is a rectangular parallelepiped. The detection window 121 has a height H. The height H is twice the tolerance of the distance that the press-fit terminal protrudes from the PCB surface after the press-fit terminal is crimped. For example, the distance that the press-fit terminal protrudes from the PCB surface after the press-fit terminal is crimped is 1.89+ / -0.35mm, then H is 0.7mm (tolerance band). Different detection window heights H can be set according to the requirements of different products. The present application does not make any restrictions here. The specific material of the switch needle is not limited, but for the consideration of machinability and wear resistance during use, metal material is generally used, and corresponding enhanced corrosion resistance treatment is performed on its surface.

[0039] See also Figure 4 The present application also discloses a crimping device 2 for a Press-fit multi-terminal crimping process, comprising a crimping platform and a PIN pin; one end of the PIN pin is arranged on the connector, the other end of the PIN pin is provided with a fisheye terminal, and the PCB board is provided with a fisheye terminal hole for the fisheye terminal to be inserted and fixed; the crimping platform also includes a fixture, a pressing block, a driving device, a detection laser, a pressure sensor, a servo encoder, a display and a controller; the switch pin is arranged in the pressing block; the PCB board is placed on the fixture and located above the connector, and the driving end of the driving device is connected to the pressing block through a connecting rod and aligned with the PCB The plate and the connector, the driving device is used to drive the pressing block to move up and down for crimping or return to the initial position; the pressure sensor is used to monitor the crimping force, the servo encoder is used to record the displacement during the crimping process in real time, and the display is used to display the force-displacement curve during the crimping process; the detection laser includes a transmitting end and a receiving end, the transmitting end and the receiving end are arranged at both ends of the pressing block, and the height of the laser transmitting end is consistent with that of the laser receiving end, the detection laser is a pair of radiation sensors, and the signal is judged by detecting whether the light transmission path is blocked by obstacles, and the controller is used to judge the result of the force-displacement curve and the result of the laser detection.

[0040] The press-fit process includes the following steps:

[0041] 1. Place the connector in the fixture;

[0042] 2.PCB is pre-placed on the connector;

[0043] 3. The pressing block is pressed down slowly from top to bottom until the fisheye terminal is pressed to the predetermined position (during this crimping process, the equipment can monitor the force-displacement curve in real time, and the switch needle embedded in the pressure head can also detect the state of the terminal being pressed out in real time)

[0044] 4. After crimping, determine whether the process is normal. If normal, continue to flow to the next station. If abnormal, flow to the scrap box.

[0045] More specifically, the elastic switch pin of the present application is embedded in the pressing block. When the upward force is applied, the switch pin moves upward, and when the upward force is removed, the switch pin returns to the starting position. The height dimension of the detection window of the switch pin is set to H (H=2b) according to the product size requirements, where b is the tolerance. The height from the center of the detection window to the laser emitting end is set to a, where a is the distance from the press-fit terminal defined by the product to the terminal protruding from the PCB surface after the terminal is crimped. When the fisheye terminal is inserted, the switch pin will be lifted up by the fisheye terminal, and the lifting height of the switch pin is the same as the length of the fisheye terminal pressed in. When there is a lack of terminals or a small number of terminals, the switch pin will not be lifted up or the lifting height is less than 1.54mm when (ab), the laser emitted from the laser emitting end will not be able to pass through the opening and will be blocked by the switch pin, and the laser receiving end will not be able to receive the laser signal. When the fisheye terminal is inserted too deeply, the lifting height of the switch pin is greater than 2.24mm when (a+b), the laser emitted by the laser emitting end will also be unable to pass through the detection window and will be blocked by the switch pin, and the laser receiving end will not be able to receive the laser signal. When the fisheye terminal is inserted normally and the height of the switch pin is within the range of a+ / -b (mm), the laser emitted by the laser emitting end can pass through the detection window of the switch pin. When the laser receiving end receives the laser signal, the product is judged to be qualified. If no laser signal is received, the product is judged to be defective.

[0046] See also Figure 5 In the specific embodiment of the elastic switch pin used in the crimping process of this application, the product requires that the distance that the press-fit terminal extends out of the PCB surface after being crimped is 1.89+ / -0.35mm. The distance from the center of the upper detection window of the switch pin to the laser light outlet in the free state is set to 1.89mm, and the height H of the detection window is 0.7mm (tolerance band). At this time, when the height of the switch pin lifted by the terminal is within the range of 1.89+ / -0.35mm, the laser signal can pass through the detection window. If a switch pin is lifted up to a height exceeding 1.89+ / -0.35mm (whether the terminal is missing or the terminal is crimped too deeply), the laser signal will be blocked, and the laser receiver will not receive the signal, then the product will be judged as defective. The laser transmitting end and the receiving end are at the same horizontal height. Taking the product of this embodiment as an example, after the switch pin contacts the surface of the PCB board, the distance from the center of the detection window to the center of the laser transmitting end / receiving end is set to 1.89mm. Different products set the distance from the center of the detection window to the center of the laser transmitting end / receiving end accordingly according to the different distances of the terminals extending out of the PCB surface, and then adjust the height of the detection window to H=2b, where b is the tolerance, which is not specifically limited here.

[0047] The present application adopts the method of pre-embedding switch signal pins in the existing pressing block. In the case of missing or insufficient terminals, the device can detect the signal and issue an alarm prompt. This solves the problem of missing or insufficient terminals that cannot be detected by force-displacement monitoring when multiple terminals are inserted at the same time in the existing process technology. The risk of defective products flowing to the next workstation or even the client is avoided. The corresponding number of switch signal pins can be pre-embedded according to the number of plugged terminals, thereby realizing the control of each terminal during the crimping process. Zero defects of the product are guaranteed. At the same time, the signal of the switch pin in the present application is detected by optical signal detection rather than electrical signal detection in the traditional sense, which can achieve higher precision monitoring. The switch pin using traditional electrical signal detection can only detect the minimum extension length. When the press-fit pin is pressed out too long, it will not be detected, and this method is a purely qualitative judgment, while the present application can control the length of the terminal pressed out within a certain range. Therefore, the present application can realize semi-quantitative judgment of the length of the press-fit pin pressed out, with higher precision.

[0048] See also Figure 6 This is a specific schematic diagram of replacing the laser instrument with a camera detection disclosed in the present invention. Camera detection can be added after crimping is completed, that is, after crimping is completed, the camera detects whether the terminal in the corresponding hole is pressed out, which can also realize the detection of the failure mode and prevent the outflow of defective products. However, the addition of a new workstation and camera will increase the manufacturing cost a lot.

[0049] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A switch pin for use in a Press-fit multi-terminal crimping process, characterized in that: include: The abutting section, the elastic section and the detection section are connected in sequence, the abutting section is used to abut the fisheye terminal, the detection section includes a detection window, the detection window has a height H, and the detection window is used to transmit the detection light signal.

2. The switch needle according to claim 1, characterized in that The detection window is in the shape of a rectangular parallelepiped, with a height H=2b, where b is the tolerance of the length of the terminal pressed out of the PCB.

3. The switch needle according to claim 1, characterized in that: The switch needle is made of metal material, and the surface thereof is subjected to corrosion resistance treatment.

4. A crimping device using the switch pin according to claim 1-3, characterized in that: It comprises a crimping platform and a PIN pin; one end of the PIN pin is arranged on the connector, the other end of the PIN pin is arranged with a fisheye terminal, and a fisheye terminal hole for the fisheye terminal to be inserted and fixed is arranged on the PCB board; The crimping platform is provided with a fixture, a pressing block, a driving device, a detection laser, a pressure sensor and a servo encoder; the switch needle is provided in the pressing block; The PCB board is placed on the fixture and located above the connector. The driving end of the driving device is connected to the pressing block through a connecting rod and is aligned with the PCB board and the connector. The driving device is used to drive the pressing block to move up and down for crimping or return to an initial position. The pressure sensor is used to monitor the crimping force, and the servo encoder is used to monitor the displacement during the crimping process. The detection laser includes a laser emitting end and a laser receiving end, and the laser emitting end and the laser receiving end are arranged at both ends of the pressing block.

5. The crimping device according to claim 4, characterized in that The height of the laser emitting end is equal to the height of the laser receiving end.

6. The crimping device according to claim 5, characterized in that The height from the center of the detection window of the switch needle to the laser emission end is a, where a is the distance that the press-fit terminal defined by the product protrudes from the PCB surface after being crimped.

7. The crimping device according to claim 4, characterized in that The detection laser is replaced by camera detection.

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