A safety barrier automatic knife lowering calibration system

Abstract

The invention discloses a safety barrier automatic knife lowering calibration system, which is fixedly mounted below a main frame and used to fix a PCB card to be calibrated. A main control computing module is respectively connected to a driving module, an acquisition module and an execution unit signal to control the driving module, the acquisition module and the execution unit to realize automatic calibration of the PCB card to be calibrated; the acquisition module is used to capture and collect images of a potentiometer and an execution unit in the PCB card to be calibrated and send them to the main control computing module to obtain position information of the potentiometer and the execution unit; the acquisition module is also used to measure the current signal passing through the PCB card to be calibrated; the main control computing module controls the driving module based on the position information and the current signal to drive the execution unit to realize autonomous calibration. Various uncertainties in manual testing are eliminated, and the test quality is improved. Calibration is ensured to be reliable and safe, and convenience is provided in future equipment management. The technical effects of simplifying production steps, facilitating operation and improving production efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the field of industrial production self-inspection, and in particular relates to an automatic safety barrier lowering calibration system. Background Art

[0002] The demand for isolation barriers in the market is constantly increasing, so it has become a necessary trend to improve production efficiency while ensuring product quality. The previous production model relied entirely on manual point-to-point current testing, with employees using handheld screwdrivers to adjust potentiometers. This production process was cumbersome, difficult to operate, and had the problem of low production efficiency.

[0003] In order to overcome the shortcomings of the current production model, it is urgent to provide a safety barrier automatic knife calibration system, which eliminates various uncertainties in manual testing and improves the test quality. At the same time, as a calibration station in the automatic testing process, this station not only ensures reliable and safe calibration, but also provides convenience in future equipment management. Summary of the invention

[0004] The technical purpose of the present invention is to provide a safety barrier automatic knife lowering calibration system to solve the problems of complicated operation and low production efficiency in the prior art.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A safety barrier automatic knife lowering calibration system, comprising: a main frame, a fixing frame and a main control computing module;

[0007] The fixed frame is installed under the main frame and is used to fix the PCB card to be calibrated;

[0008] The main frame is equipped with a driving module, a collection module and an execution unit;

[0009] The main control calculation module is respectively connected with the driving module, the acquisition module and the execution unit signal to control the driving module, the acquisition module and the execution unit to realize automatic calibration of the PCB card to be calibrated;

[0010] The acquisition module is used to capture images of the potentiometer and the execution unit in the PCB card to be calibrated and send them to the main control calculation module to obtain the position information of the potentiometer and the execution unit; the acquisition module is also used to measure the current signal passing through the PCB card to be calibrated;

[0011] The main control calculation module controls the driving module based on the position information and the current signal to drive the execution unit to achieve autonomous calibration.

[0012] Among them, the upper end surface of the fixed frame is provided with at least one calibration carrier, and a correspondingly arranged rotating pressure rod and a spinning cylinder;

[0013] The calibration carrier is fixed to the upper end surface of the fixing frame and is used to carry the PCB card to be calibrated;

[0014] The rotary pressure rod can be rotated to the top of the calibration carrier to fix the PCB card to be calibrated placed on the calibration carrier;

[0015] The spinning cylinder is used to drive the rotary pressure rod to rotate to a specified position.

[0016] Specifically, the rotary pressure rod includes a first limiting rod, a second limiting rod, a rotating rod, and a rotating member;

[0017] One side of the first limit rod is connected to one end of the rotating rod, and the other end of the rotating rod is connected to one end of the second limit rod; the first limit rod and the second limit rod are arranged parallel to each other and connected to the same circumference of the rotating rod; one end of the rotating member is fixed to the fixed frame and arranged vertically upward, and the rotating rod is provided with a through hole, and the rotating rod is rotatably connected to the other end of the rotating member through the through hole; the spinning cylinder is used to make the rotating rod rotate around the rotating member.

[0018] Among them, the drive module includes a three-axis module, a servo motor and a motion motor driver;

[0019] The three-axis module is used to control the three-dimensional direction of the actuator;

[0020] The servo motor is used to control the rotation direction and rotation angle of the actuator;

[0021] The motion motor driver is arranged on the three-axis module, and is used to respectively drive the shooting unit and the execution unit of the acquisition module to move above the PCB card to be calibrated.

[0022] Specifically, the shooting unit includes a CCD shooting mechanism, which is arranged on the three-axis module and is arranged downward. It is controlled by the main control computing module and moved to the top of the PCB card to be calibrated under the drive of the motion motor driver. It is used to shoot to find the positioning point of the potentiometer in the PCB card to be calibrated.

[0023] Further preferably, the acquisition module further comprises a torque sensor, and the torque sensor is installed with the execution unit, and is used to measure the pressure when the execution unit rotates.

[0024] Further preferably, the acquisition module also includes a beamax MC2 signal source and a signal measurement source. The beamax MC2 signal source is used to output the milliampere current range to the potentiometer in the PCB card to be calibrated, and the current is received by the signal measurement source after passing through the potentiometer in the PCB card to be calibrated, so as to measure and obtain the current signal and input it into the main control calculation module to determine whether the calibration is completed.

[0025] Among them, the main control calculation module performs calibration in the following specific way:

[0026] If the measured current signal is less than 3.993 mA, the execution unit rotates clockwise;

[0027] After the first rotation of the execution unit, if the current signal obtained by measurement again satisfies X1 < X2 < 3.993 mA, the execution unit rotates clockwise, and the rotation angle formula is:

[0028] After the first rotation of the execution unit, if the current signal obtained by measurement again satisfies X1 < 3.993 mA < 4.007 mA < X2, the execution unit rotates counterclockwise, and the rotation angle formula is:

[0029] If the measured current signal is greater than 4.007 mA, the execution unit rotates counterclockwise;

[0030] After the first rotation of the execution unit, if the current signal obtained by measurement again satisfies X2 < 3.993 mA < 4.007 mA < X1, the execution unit rotates clockwise, and the rotation angle formula is:

[0031] After the first rotation of the execution unit, if the current signal obtained by measurement again satisfies 4.007 mA < X2 < X1, the execution unit rotates counterclockwise, and the rotation angle formula is:

[0032] Wherein, Y is the first rotation angle, Y1 and Y2 are the rotation angles required for the second time, X1 is the angle after the first rotation, and X2 is the angle after the second rotation.

[0033] Wherein, the execution unit includes a screwdriver and a spring provided at the bottom end of the screwdriver;

[0034] The screwdriver is used to cooperate with the potentiometer in the PCB card to be calibrated to rotate the potentiometer, so as to achieve autonomous calibration; the spring is used to provide buffering when the screwdriver contacts the potentiometer.

[0035] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0036] In order to overcome the deficiencies of the current production mode, the present application provides a safety barrier automatic knife-down calibration system, which eliminates various uncertainties in manual testing and improves the test quality. At the same time, as a calibration station in the automatic test process, this station not only ensures reliable and safe calibration, but also provides convenience in subsequent equipment management. It simplifies the production steps, is easy to operate, and has the technical effect of improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0038] Figure 1 This is a main frame structure diagram of a safety barrier automatic lowering knife calibration system according to this embodiment of the present invention;

[0039] Figure 2 This is an overall structural diagram of a safety barrier automatic knife lowering calibration system of this embodiment of the present invention;

[0040] Figure 3 This is a diagram of the current measurement structure of the calibration tooling of this embodiment of the present invention;

[0041] Figure 4 It is the channel selection control part of this embodiment of the present invention.

[0042] Description of Reference Numerals

[0043] 1: Calibration carrier; 2: Rotating pressure rod; 3: Motion motor driver; 4: CCD camera mechanism; 5: Spring; 6: Screwdriver; 7: Torque sensor. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0045] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0046] The following is a further detailed description of a safety barrier automatic knife lowering calibration system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0047] Example 1

[0048] See also Figures 1 to 4 The present embodiment provides a safety barrier automatic knife lowering calibration system, including: a main frame, a fixed frame and a main control computing module.

[0049] See also Figure 1 and Figure 2 The fixed frame is arranged below the main frame and is used to fix the PCB card to be calibrated. Among them, the upper end surface of the fixed frame is provided with at least one calibration carrier 1, and a correspondingly arranged rotating pressure rod 2 and a spinning cylinder. The calibration carrier 1 is fixed to the upper end surface of the fixed frame, and is a contoured carrier with the shape of a fence card shell, which is used to carry the PCB card to be calibrated. After the PCB card to be calibrated is placed, the rotating pressure rod 2 is rotated to the top of the calibration carrier 1 by the spinning cylinder to fix the PCB card to be calibrated. Specifically, the rotary pressure rod 2 includes a first limit rod, a second limit rod, a rotating rod, and a rotating member; one end of the first limit rod is connected to one end of the rotating rod, and the other end of the rotating rod is connected to one end of the second limit rod; and the first limit rod and the second limit rod are arranged parallel to each other and connected to the same circumference of the rotating rod; one end of the rotating member is fixed to the fixed frame and arranged vertically upward, and the rotating rod is provided with a through hole, and the rotating rod is rotatably connected to the other end of the rotating member through the through hole; the spinning cylinder is used to make the rotating rod rotate around the rotating member.

[0050] See also Figure 1 and Figure 2 The main frame mainly includes a frame support and a three-axis module arranged on the support, and a servo motor and a motion motor driver 3 are arranged on the three-axis module. The three-axis module, the servo motor and the motion motor driver 3 together constitute a drive module. The three-axis module uses its three-axis movable characteristics to control the movement of the execution unit in three dimensions. The servo motor is arranged on the three-axis module, and is controlled by the main control calculation module to control the rotation direction and rotation angle of the execution unit, and its minimum resolution is 0.001 degrees. The motion motor driver 3 is used to drive the shooting unit of the acquisition module to move above the PCB card to be calibrated, and the motion motor driver 3 also cooperates with the three-axis module to move the execution unit above the calibration PCB card.

[0051] Preferably, the acquisition module includes a CCD camera mechanism 4, a torque sensor 7, a beamax MC2 signal source and a signal measurement source. The shooting unit is a CCD camera mechanism 4, which is arranged on the main frame and is arranged downward, and is controlled by the main control calculation module to move to the top of the PCB card to be calibrated under the drive of the motion motor driver 3, and is used to shoot to find the positioning point of the potentiometer in the PCB card to be calibrated. The ultimate goal is to accurately move the execution unit to the top of each potentiometer within the PCB card (20mm×20mm). Preferably, the acquisition module also includes a torque sensor 7, and the torque sensor 7 is installed with an execution unit, which is used to measure the rotation pressure of the execution unit to prevent the execution unit from damaging the adjusted potentiometer during rotation.

[0052] Preferably, the acquisition module also includes a beamax MC2 signal source and a signal measurement source. The beamax MC2 signal source is used to output a milliampere current range to the potentiometer in the PCB card to be calibrated. The signal is received by the signal measurement source through the selection channel and the potentiometer in the PCB card to be calibrated, so as to measure and obtain the current signal and input it into the main control calculation module to determine whether the calibration is completed.

[0053] Specifically, the execution unit is a screwdriver 6 and a spring 5 connected to the bottom of the screwdriver 6. The screwdriver 6 is used to cooperate with the potentiometer in the PCB card to be calibrated to rotate the potentiometer until the current signal passing through the potentiometer meets the standard range to achieve self-calibration. The spring 5 is used to provide a buffer when the screwdriver 6 contacts the potentiometer, and is compatible with the height error of ±3mm for all potentiometers when the screwdriver 6 is cut.

[0054] See also Figures 1 to 4 The implementation process of this embodiment is as follows: place the barrier PCB product part that needs to be calibrated in the calibration carrier 1. After confirming that the card is in place, rotate the pressure rod 2 to stabilize the PCB product in the calibration carrier 1, and at the same time actuate the cylinder to insert the probe to keep it fixed. Move the motion motor driver 3, move the CCD camera mechanism 4 to the top of the PCB product, turn on the CCD camera light source, illuminate the PCB product, and provide CCD visual recognition brightness conditions. After the CCD camera mechanism 4 obtains the product photo, the screen is reduced to the part with an adjustable potentiometer. According to the visual recognition effect, find the center point of the potentiometer and the two small holes indicating the direction, a total of three positioning points. After completing the visual positioning, move the screwdriver 6 to the top of the potentiometer, rotate the screwdriver 6 until it matches the angle of the potentiometer groove direction, and complete the cutting.

[0055] Reference Figure 3 and Figure 4 After the cutting is completed, the card is powered on, and the beamaxMC2 signal source is controlled by the computer to output the milliampere current range through the control calculation module, that is, the computer. At the same time, the channel switching is controlled to open the channel that needs to be opened. The current output by the signal source passes through the selected channel, the card, and the selected channel and then returns to the signal measurement source. Compare the output current signal with the measured current signal.

[0056] Set the current signal qualified range to 4±0.007mA, and compare the measured current value with the standard value (4±0.007mA).

[0057] If the measured current value is within the standard value range (4±0.007 mA), the screwdriver 6 does not need to be rotated, and it is determined that the potentiometer is adjusted successfully. The potentiometer calibration can be skipped and the next step can be performed.

[0058] If the measured current value is greater than the standard value range (4 ± 0.007 mA), the screwdriver 6 rotates counterclockwise. Generally, the resistance value of the potentiometer without rotation during factory production is on the high side, and the measured current is often much less than 4 mA. Therefore, if the measured current value is less than the standard value range (4 ± 0.007 mA), the screwdriver 6 rotates clockwise.

[0059] Therefore, when comparing with the first signal, the rotation angle of the screwdriver 6 is confirmed. After that, the first rotation angle is set as Y, and the direction is clockwise. After the screwdriver 6 rotates, the current measurement signal value is compared with the standard value again. The current measurement value before rotation is X1, and the current measurement value after rotation is X2. Since the signal source output is always 4 mA.

[0060] Therefore, when X1 < X2 < 3.993 mA is satisfied, the next rotation direction is clockwise, and the rotation angle is Y1.

[0061] When X1 < 3.993 mA < 4.007 mA < X2 is satisfied, the next rotation direction is counterclockwise, and the rotation angle is Y2.

[0062] If the angle of the potentiometer at factory is on the high side, resulting in X1 > 4.007 mA obtained from the first measurement, the first rotation angle is set as Y, and the direction is counterclockwise. After the screwdriver 6 rotates, the current measurement signal value is compared with the standard value again, and the current measurement value after rotation is X2.

[0063] Therefore, when X2 < 3.993 mA < 4.007 mA < X1 is satisfied, the next rotation direction is clockwise, and the rotation angle is Y1.

[0064] When 4.007 mA < X2 < X1, the next rotation direction is counterclockwise, and the rotation angle is Y2.

[0065] After rotating the potentiometer multiple times, the final measurement value is X0 (3.993 mA ≤ X0 ≤ 4.007 mA), and the total rotation angle is Y0 (counterclockwise is set as negative, and clockwise is set as positive). It is determined that the potentiometer adjustment is qualified, and the calibration report is stored in the computer, recording the total rotation angle Y0 and the final current measurement value X0 of this rotation. When all the potentiometers on the PCB product are adjusted, it is determined that the product calibration is successful.

[0066] In order to make the first rotation as close as possible to the qualified range value, a corresponding database is established according to the isolation gate PCB product model classification. Each time, the value of the first rotation angle Y is taken as the median value of the total rotation angles Y0 of the potentiometers of the same PCB product model in the recent fifty times.

[0067] When each potentiometer of the isolation gate PCB product is adjusted, the card is determined to be calibrated successfully, the calibration tooling finishes work, the card is powered off, the screwdriver 6 is lifted upward, the motion motor driver 3 moves the CCD camera mechanism 4 and the screwdriver 6 to the origin position, and at the same time the cylinder is actuated to retract the probe, lift the rotating pressure rod 2, return to the origin position, and take the calibrated PCB product out of the calibration carrier 1 to complete the calibration process.

[0068] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A safety barrier automatic knife lowering calibration system, characterized in that: include: Main frame, fixed frame and main control computing module; The fixing frame is arranged below the main frame and is used to fix the PCB card to be calibrated; The main frame is provided with a driving module, a collection module and an execution unit; The main control calculation module is respectively connected with the driving module, the acquisition module and the execution unit by signal, so as to control the driving module, the acquisition module and the execution unit to realize automatic calibration of the PCB card to be calibrated; The acquisition module is used to capture images of the potentiometer and the execution unit in the PCB card to be calibrated and send them to the main control calculation module to obtain position information of the potentiometer and the execution unit; the acquisition module is also used to measure the current signal passing through the PCB card to be calibrated; The main control calculation module controls the driving module based on the position information and the current signal to drive the execution unit to achieve autonomous calibration; The acquisition module further includes a beamax MC2 signal source and a signal measurement source. The beamax MC2 signal source is used to output a milliampere current to the potentiometer in the PCB card to be calibrated, and the signal is received by the signal measurement source after passing through the potentiometer in the PCB card to be calibrated, so as to measure and obtain the current signal and input it into the main control calculation module to determine whether the calibration is completed; If the measured current signal is less than 3.993 mA, the execution unit is caused to rotate clockwise; After the execution unit rotates for the first time, if the current signal obtained by measuring again satisfies When , the execution unit is rotated clockwise, and the rotation angle formula is: ; After the execution unit rotates for the first time, if the current signal obtained by measuring again satisfies When , the execution unit is rotated counterclockwise, and the rotation angle formula is: ; If the measured current signal is greater than 4.007 mA, the execution unit is caused to rotate counterclockwise; After the execution unit rotates for the first time, if the current signal obtained by measuring again satisfies When , the execution unit is rotated clockwise, and the rotation angle formula is: ; After the execution unit rotates for the first time, if the current signal obtained by measuring again satisfies When , the execution unit is rotated counterclockwise, and the rotation angle formula is: ; in, is the first rotation angle, is the second required rotation angle, is the angle after the first rotation, is the angle after the second rotation.

2. The safety barrier automatic knife lowering calibration system according to claim 1 is characterized in that: The upper end surface of the fixing frame is provided with at least one calibration carrier, and a correspondingly arranged rotating pressure rod and a spinning cylinder; The calibration carrier is fixed to the upper end surface of the fixing frame and is used to carry the PCB card to be calibrated; The rotating pressure rod can be rotated to the top of the calibration carrier to fix the PCB card to be calibrated placed on the calibration carrier; The spinning cylinder is used to drive the rotating pressure rod to rotate to a specified position.

3. The safety barrier automatic knife lowering calibration system according to claim 2 is characterized in that: The rotary pressure rod comprises a first limiting rod, a second limiting rod, a rotating rod, and a rotating member; One side of the first limit rod is connected to one end of the rotating rod, and the other end of the rotating rod is connected to one end of the second limit rod; the first limit rod and the second limit rod are arranged parallel to each other and are connected to the same circumference of the rotating rod; one end of the rotating member is fixed to a fixed frame and arranged vertically upward, and the rotating rod is provided with a through hole, and the rotating rod is rotatably connected to the other end of the rotating member through the through hole; the spinning cylinder is used to make the rotating rod rotate around the rotating member.

4. The safety barrier automatic knife lowering calibration system according to claim 1 is characterized in that: The driving module includes a three-axis module, a servo motor and a motion motor driver; The three-axis module is used to control the three-dimensional direction of the execution unit; The servo motor is used to control the rotation direction and rotation angle of the execution unit; The motion motor driver is arranged on the three-axis module, and is used to respectively drive the shooting unit of the acquisition module and the execution unit to move above the PCB card to be calibrated.

5. The safety barrier automatic knife lowering calibration system according to claim 4 is characterized in that: The shooting unit includes a CCD shooting mechanism, which is arranged on the three-axis module and is arranged downward. It is controlled by the main control computing module and driven by the motion motor driver to move above the PCB card to be calibrated, and is used for shooting to find the positioning point of the potentiometer in the PCB card to be calibrated.

6. The safety barrier automatic knife lowering calibration system according to claim 5 is characterized in that: The acquisition module further includes a torque sensor, on which the execution unit is installed, and is used to measure the pressure of the execution unit during rotation.

7. The safety barrier automatic knife lowering calibration system according to claim 1 is characterized in that: The execution unit includes a screwdriver and a spring arranged at the bottom end of the screwdriver; The screwdriver is used to cooperate with the potentiometer in the PCB card to be calibrated to rotate the potentiometer, so as to achieve autonomous calibration; The spring is used to provide buffering when the screwdriver contacts the potentiometer.

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