Missed screw detection device

Abstract

The application provides a missed screw detection device, comprising a bottom plate, an angle grinder pressing and fixing mechanism, an angle grinder installation position detection mechanism, a missed screw detection mechanism and a control unit. The bottom plate is used to form the installation basis of the missed screw detection device. The angle grinder installation position detection mechanism is used to detect whether the angle grinder pressing and fixing mechanism presses and fixes the angle grinder in place. The missed screw detection device provided by the application mainly comprises a bottom plate, an angle grinder pressing and fixing mechanism, an angle grinder installation position detection mechanism, a missed screw detection mechanism and a control unit. All the screws to be detected can be automatically detected, the operation of different personnel has the same detection result, there is no human factor influence, the device has the characteristics of reliable, fast, complete, safe and the like, has high detection precision and good reliability, and can effectively detect and solve the problem of missed screw.

Description

Technical Field

[0001] This invention relates to the field of angle grinder manufacturing technology, specifically to a device for detecting missing screws. Background Technology

[0002] An angle grinder, also known as a grinding machine or disc grinder, is an abrasive tool used for cutting and polishing fiberglass. It is a handheld power tool primarily used for cutting, grinding, and brushing metals and stone.

[0003] The main components of handheld angle grinders are mostly connected by screws. In order to improve labor productivity, highly automated screw fastening machines are used for screw tightening. However, during use, due to the errors of the parts, positioning accuracy, processing accuracy, and the errors of the automatic screw fastening machine itself, some screws are missed during automatic driving. Manual inspection has the problem of missed detection and false detection, and it cannot effectively and reliably detect defective products or effectively detect and solve the problem of missed screws.

[0004] Therefore, a device for detecting missing screws is proposed. Summary of the Invention

[0005] The present invention aims to solve the problems mentioned in the background art by providing a device for detecting missing screws.

[0006] The specific technical solution is as follows:

[0007] A device for detecting missing screws, comprising:

[0008] The base plate serves as the mounting foundation for the missing screw detection device.

[0009] An angle grinder clamping and fixing mechanism, which is used to clamp and fix the angle grinder to be tested;

[0010] An angle grinder installation detection mechanism is used to detect whether the angle grinder clamping and fixing mechanism has clamped and fixed the angle grinder in place.

[0011] A missing screw detection mechanism is used to detect whether the angle grinder has any missing screws.

[0012] The control unit is electrically connected to the angle grinder clamping and fixing mechanism, the angle grinder installation status detection mechanism, and the missing screw detection mechanism, respectively, and is used to control the automatic operation of the angle grinder clamping and fixing mechanism, the angle grinder installation status detection mechanism, and the missing screw detection mechanism.

[0013] In the aforementioned missing screw detection device: when the angle grinder installation status detection mechanism detects that the angle grinder clamping and fixing mechanism has clamped and fixed the angle grinder in place, the control unit will control the missing screw detection mechanism to work to detect whether there are any missing screws on the angle grinder, and the control unit will display the detection result.

[0014] The aforementioned missing screw detection device includes an angle grinder clamping and fixing mechanism comprising a positioning seat, a support seat, a clamping cylinder, and a clamping block. The positioning seat, the support seat, and the clamping cylinder are all fixedly installed on the upper part of the base plate. The positioning seat is located between the support seat and the clamping cylinder, and the clamping block is fixedly installed at the telescopic end of the clamping cylinder.

[0015] The aforementioned missing screw detection device, wherein: the angle grinder installation status detection mechanism is located below the angle grinder clamping and fixing mechanism, and the angle grinder installation status detection mechanism includes a vertical plate, a first mounting plate, a second mounting plate, two first guide rods, a moving plate, a first cylinder, two mounting seats, and two first sensors. The vertical plate is vertically and fixedly installed at the bottom of the base plate. The first mounting plate and the second mounting plate are both horizontally and fixedly installed on one side of the vertical plate. The two first guide rods are both vertically and fixedly installed between the first mounting plate and the second mounting plate. The moving plate is horizontally and slidably fitted onto the two first guide rods. The first cylinder is fixedly installed on the side of the vertical plate, and the first… The telescopic end of the cylinder is fixedly connected to the bottom of the movable plate. Two mounting seats are fixedly installed on the upper part of the movable plate, and guide cylinders are fixedly installed inside the upper parts of both mounting seats. A round rod is movably installed inside the guide cylinder. A first probe is fixedly installed at the upper end of the round rod, and a first return spring is fitted onto the round rod. The first probe is located outside the upper part of the mounting seat. The upper end of the first return spring is fixedly connected to the bottom end of the first probe, and the bottom end of the first return spring is fixedly connected to the inner wall of the guide cylinder. Two first sensors are fixedly embedded in the movable plate, and the detection parts of the two first sensors extend into the bottom of the two mounting seats respectively to detect whether the bottom end of the round rod is close to the probe.

[0016] When the first probe is subjected to a force directed toward the first sensor, the first probe moves closer to the detection section of the first sensor.

[0017] In the aforementioned missing screw detection device, two first linear bearings are embedded in the movable plate, and two first guide rods are respectively disposed through the two first linear bearings, with the side of the first guide rods slidably connected to the balls on the inner wall of the first linear bearings.

[0018] The aforementioned missing screw detection device, wherein: the missing screw detection mechanism is located adjacent to the angle grinder clamping and fixing mechanism, and the missing screw detection mechanism includes a first fixed guide plate, a second fixed guide plate, two second guide rods, a first push plate, a second push plate, a second cylinder, a plurality of second probes, and a plurality of second sensors. The first fixed guide plate and the second fixed guide plate are both vertically and fixedly installed on the upper part of the base plate. The two second guide rods are both horizontally and slidably installed on the first fixed guide plate and the second fixed guide plate. The first push plate is fixedly installed on the two second guide rods, and the first push plate is located between the first fixed guide plate and the second fixed guide plate. The second push plate is fixedly installed on the two second guide rods, and the second push plate is located on the side of the second fixed guide plate away from the first push plate. The second cylinder is fixedly installed on the first fixed guide plate and the second fixed guide plate. Between them, and the telescopic end of the second cylinder is fixedly connected to one side of the second push plate facing the second fixed guide plate, for driving the first push plate and the second push plate to move toward the angle grinder pressing and fixing mechanism. A plurality of second probes are horizontally and slidably inserted on the first push plate. The head ends of the plurality of second probes are movably inserted through the first fixed guide plate, and the tail ends of the plurality of second probes are movably inserted through the second fixed guide plate. Each tail end of the second probe is slidably fitted with an anti-collision sleeve, and each second probe is fixedly fitted with a baffle plate. Each second probe is movably fitted with a second return spring. A plurality of second sensors are fixedly embedded in the second push plate, and the number of the plurality of second sensors is the same as the number of the plurality of second probes. One second sensor corresponds to one second probe. The second sensor is used to detect whether the anti-collision sleeve at the corresponding position is close.

[0019] In the aforementioned missing screw detection device, the anti-collision sleeve is located between the second fixed guide plate and the second push plate, and a buffer spring is installed inside the anti-collision sleeve. The buffer spring abuts against the end wall of the anti-collision sleeve facing the second push plate and the tail end of the second probe. The buffer spring is used to prevent the anti-collision sleeve from damaging the second sensor.

[0020] The baffle and the second reset spring are both located between the first push plate and the second fixed guide plate, and the baffle is located between the second reset spring and the first push plate. The second reset spring is used to drive the second probe to reset. Under the action of the second reset spring, the baffle abuts against the side of the first push plate facing the second fixed guide plate. At the same time, under the action of the second reset spring, the end of the anti-collision sleeve facing away from the second push plate abuts against the side of the second fixed guide plate facing the second push plate.

[0021] In the aforementioned missing screw detection device, two second linear bearings are fixedly embedded in both the first fixed guide plate and the second fixed guide plate. Two second guide rods are respectively installed through the corresponding positions of the second linear bearings, and the side of the second guide rods is slidably connected to the balls on the inner wall of the second linear bearings.

[0022] The aforementioned missing screw detection device comprises: a control unit including a control box, a touch screen, a start switch, a red indicator light, a green indicator light, a buzzer, and a PLC controller; the control box is fixedly installed on the upper part of the base plate; the touch screen, the start switch, the red indicator light, the green indicator light, and the buzzer are all fixedly installed on the front of the control box; the PLC controller is fixedly installed inside the control box; and the PLC controller is electrically connected to the touch screen, the start switch, the red indicator light, the green indicator light, the buzzer, the clamping cylinder, the first cylinder, two first sensors, the second cylinder, and several second sensors.

[0023] In the aforementioned missing screw detection device, a support leg is fixedly installed at the bottom of the base plate, and a through groove is provided on the base plate at the position corresponding to the first probe for the first probe to pass through.

[0024] The present invention has the following beneficial effects:

[0025] The missing screw detection device provided by this invention mainly consists of a base plate, an angle grinder clamping and fixing mechanism, an angle grinder installation status detection mechanism, a missing screw detection mechanism, and a control unit. It can automatically detect all screws that need to be tested, and different operators can operate it to achieve the same test results. It is not affected by human factors and has the characteristics of reliable, fast, complete, and safe detection. It has high detection accuracy and good reliability and can effectively detect and solve the problem of missing screws. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the working structure of the missing screw detection device provided in this embodiment of the invention;

[0027] Figure 2 A partial structural diagram of the screw-missing detection device provided in an embodiment of the present invention. Figure 1 ;

[0028] Figure 3 A partial structural diagram of the screw-missing detection device provided in an embodiment of the present invention. Figure 2 ;

[0029] Figure 4 A partial structural diagram of the screw-missing detection device provided in an embodiment of the present invention. Figure 2 ;

[0030] Figure 5 This is a schematic diagram of the angle grinder installation detection mechanism in the screw-missing detection device provided in this embodiment of the invention.

[0031] Figure 6 for Figure 5 Enlarged structural diagram of middle view A;

[0032] Figure 7 This is a schematic diagram of the missing screw detection mechanism in the missing screw detection device provided in an embodiment of the present invention. Figure 1 ;

[0033] Figure 8 This is a schematic diagram of the missing screw detection mechanism in the missing screw detection device provided in this embodiment of the invention. Figure 2 ;

[0034] Figure 9 for Figure 8 Enlarged structural diagram of middle view B;

[0035] Figure 10 This is a schematic diagram of the anti-collision sleeve in the missing screw detection device provided in an embodiment of the present invention.

[0036] In the attached image:

[0037] 1. Base plate; 101. Support legs;

[0038] 2. Angle grinder clamping and fixing mechanism; 201. Positioning seat; 202. Support seat; 203. Clamping cylinder; 204. Clamping block;

[0039] 3. Angle grinder installation accuracy detection mechanism; 301. Vertical plate; 302. First mounting plate; 303. First cylinder; 304. First guide rod; 305. First linear bearing; 306. Second mounting plate; 307. Mounting base; 308. First probe; 309. Moving plate; 310. First sensor; 311. Guide cylinder; 312. Round rod; 313. First return spring;

[0040] 4. Missing Screw Detection Mechanism; 401. First Fixed Guide Plate; 402. Second Guide Rod; 403. Second Probe; 404. First Push Plate; 405. Second Fixed Guide Plate; 406. Anti-collision Sleeve; 407. Second Sensor; 408. Second Linear Bearing; 409. Second Push Plate; 410. Second Cylinder; 411. Buffer Spring; 412. Second Return Spring; 413. Baffle Plate;

[0041] 5. Control unit; 501. Control box; 502. Touch screen display; 503. Start switch; 504. Buzzer; 505. Green indicator light; 506. Red indicator light;

[0042] 6. Angle grinder. Detailed Implementation

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Example

[0048] The missing screw detection device provided in this embodiment, such as Figures 1-10 As shown, it includes: base plate 1, angle grinder clamping and fixing mechanism 2, angle grinder installation status detection mechanism 3, missing screw detection mechanism 4, and control unit 5.

[0049] The base plate 1 is used to form the mounting foundation for the missing screw detection device;

[0050] Among them, the angle grinder clamping and fixing mechanism 2 is used to clamp and fix the angle grinder 6 to be tested;

[0051] Among them, the angle grinder installation detection mechanism 3 is used to detect whether the angle grinder clamping and fixing mechanism 2 has clamped and fixed the angle grinder 6 in place;

[0052] Among them, the missing screw detection mechanism 4 is used to detect whether there are any missing screws in the angle grinder 6;

[0053] The control unit 5 is electrically connected to the angle grinder clamping and fixing mechanism 2, the angle grinder installation status detection mechanism 3, and the missing screw detection mechanism 4, respectively, and is used to control the automatic operation of the angle grinder clamping and fixing mechanism 2, the angle grinder installation status detection mechanism 3, and the missing screw detection mechanism 4.

[0054] The missing screw detection device using the above technical solution mainly consists of a base plate 1, an angle grinder clamping and fixing mechanism 2, an angle grinder installation status detection mechanism 3, a missing screw detection mechanism 4, and a control unit 5. It can automatically detect all the screws that need to be detected. Different operators can operate the device and get the same detection results. There is no human factor affecting the detection. The detection is reliable, fast, complete, and safe.

[0055] Specifically, to prevent the missing screw detection device from operating when the angle grinder 6 is not properly clamped and fixed, thus causing the missing screw detection mechanism 4 to fail to detect the screws at the corresponding positions, in this embodiment: after the angle grinder installation status detection mechanism 3 detects that the angle grinder clamping and fixing mechanism 2 has clamped and fixed the angle grinder 6 in place, the control unit 5 will control the missing screw detection mechanism 4 to work to detect whether there are any missing screws on the angle grinder 6, and the control unit 5 will display the detection results. If any screw is unqualified during the detection, the entire machine is judged to be unqualified, and the location of the unqualified screw will be displayed.

[0056] Specifically, in order to realize the specific function of the angle grinder clamping and fixing mechanism 2, in this embodiment: the angle grinder clamping and fixing mechanism 2 includes a positioning seat 201, a support seat 202, a clamping cylinder 203 and a clamping block 204. The positioning seat 201, the support seat 202 and the clamping cylinder 203 are all fixedly installed on the upper part of the base plate 1. The positioning seat 201 is located between the support seat 202 and the clamping cylinder 203. The clamping block 204 is fixedly installed at the telescopic end of the clamping cylinder 203.

[0057] The angle grinder clamping and fixing mechanism 2 using the above technical solution mainly consists of a positioning seat 201, a support seat 202, a clamping cylinder 203, and a clamping cylinder 203. In use, the angle grinder 6 is placed on the upper part of the positioning seat 201 and the support seat 202, and then the clamping cylinder 203 is activated. The clamping cylinder 203 drives the clamping cylinder 203 to clamp and fix the angle grinder 6 on the upper part of the positioning seat 201 and the support seat 202.

[0058] Specifically, to achieve the specific function of the angle grinder installation status detection mechanism 3, in this embodiment: the angle grinder installation status detection mechanism 3 is located below the angle grinder clamping and fixing mechanism 2, and the angle grinder installation status detection mechanism 3 includes a vertical plate 301, a first mounting plate 302, a second mounting plate 306, two first guide rods 304, a moving plate 309, a first cylinder 303, two mounting seats 307, and two first sensors 310. The vertical plate 301 is vertically and fixedly installed at the bottom of the base plate 1. The first mounting plate 302 and the second mounting plate 306 are both horizontally and fixedly installed on one side of the vertical plate 301. The two first guide rods 304 are both vertically and fixedly installed between the first mounting plate 302 and the second mounting plate 306. The moving plate 309 is horizontally and slidably fitted onto the two first guide rods 304. The first cylinder 303 is fixedly installed on the vertical plate 301. On the side, the telescopic end of the first cylinder 303 is fixedly connected to the bottom of the moving plate 309. Two mounting seats 307 are fixedly installed on the upper part of the moving plate 309, and guide cylinders 311 are fixedly installed inside the upper part of each of the two mounting seats 307. A round rod 312 is movably installed inside the guide cylinder 311. A first probe 308 is fixedly installed on the upper end of the round rod 312, and a first return spring 313 is fitted onto the round rod 312. The first probe 308 is located outside the upper part of the mounting seat 307. The upper end of the first return spring 313 is fixedly connected to the bottom end of the first probe 308, and the bottom end of the first return spring 313 is fixedly connected to the inner wall of the guide cylinder 311. Two first sensors 310 are fixedly embedded in the moving plate 309, and the detection parts of the two first sensors 310 extend into the bottom of the two mounting seats 307 respectively to detect whether the bottom end of the round rod 312 is close to the target.

[0059] When the first probe 308 is subjected to a force directed toward the first sensor 310, the first probe 308 moves closer to the detection part of the first sensor 310.

[0060] The angle grinder installation detection mechanism 3, employing the above technical solution, mainly consists of a vertical plate 301, a first mounting plate 302, a second mounting plate 306, two first guide rods 304, a moving plate 309, a first cylinder 303, two mounting seats 307, and two first sensors 310. In use, the first cylinder 303 drives the moving plate 309 to move linearly up and down along the two first guide rods 304. When the angle grinder 6 is installed correctly, as the first cylinder 303 drives the moving plate 309 to move upwards along the two first guide rods 304, the upper end of the first probe 308 will abut against the bottom of the angle grinder 6. At this time, the first probe 308 is pressed down, and the first probe 308 drives the round rod 312 to move closer to the detection part of the first sensor 310. At this time, the first sensor 310 generates a sensing signal and uploads it to the control unit 5. The control unit 5 determines that the angle grinder 6 is installed in place. When the angle grinder 6 is not installed in place, the first cylinder 303 drives the moving plate 309 to move upward along the two first guide rods 304. The first probe 308 will not be pressed down, and the first sensor 310 will not detect it. At this time, it can be determined that the angle grinder 6 is not installed in place. The first reset spring 313 is used to drive the first probe 308 to reset.

[0061] Specifically, in order to reduce the friction between the first guide rod 304 and the moving plate 309, in this embodiment: two first linear bearings 305 are embedded on the moving plate 309, and the two first guide rods 304 are respectively disposed through the two first linear bearings 305, and the side of the first guide rod 304 is slidably connected to the ball bearings on the inner wall of the first linear bearing 305. The first linear bearings 305 can effectively reduce the friction between the first guide rod 304 and the moving plate 309, thereby reducing the friction between the first guide rod 304 and the moving plate 309.

[0062] Specifically, to achieve the specific function of the missing screw detection mechanism 4, in this embodiment: the missing screw detection mechanism 4 is located near the angle grinder clamping and fixing mechanism 2, and the missing screw detection mechanism 4 includes a first fixed guide plate 401, a second fixed guide plate 405, two second guide rods 402, a first push plate 404, a second push plate 409, a second cylinder 410, several second probes 403, and several second sensors 407. The first fixed guide plate 401 and the second fixed guide plate 405 are both vertically and fixedly installed on the base plate 1. At the top, two second guide rods 402 are horizontally and slidably mounted on the first fixed guide plate 401 and the second fixed guide plate 405. A first push plate 404 is fixedly mounted on the two second guide rods 402, and the first push plate 404 is located between the first fixed guide plate 401 and the second fixed guide plate 405. A second push plate 409 is fixedly mounted on the two second guide rods 402, and the second push plate 409 is located on the side of the second fixed guide plate 405 away from the first push plate 404. A second cylinder 410 is fixedly mounted on the first fixed guide plate 401. Between the first and second fixed guide plates 401 and the second cylinder 410, the telescopic end of the second cylinder 410 is fixedly connected to one side of the second push plate 409 facing the second fixed guide plate 405, for driving the first push plate 404 and the second push plate 409 to move toward the angle grinder pressing and fixing mechanism 2. Several second probes 403 are horizontally and slidably inserted on the first push plate 404. The head ends of several second probes 403 are movably inserted through the first fixed guide plate 401, and the tail ends of several second probes 403 are movably inserted through the second fixed guide plate 405. Each of the second probes 403 has a slidably fitted anti-collision sleeve 406 at its tail end, and each of the second probes 403 has a fixedly fitted baffle 413. Each of the second probes 403 has a movablely fitted second return spring 412. Several second sensors 407 are fixedly embedded in the second push plate 409, and the number of the several second sensors 407 is the same as the number of the several second probes 403. Each second sensor 407 corresponds to one second probe 403. The second sensor 407 is used to detect whether the anti-collision sleeve 406 at the corresponding position is close.

[0063] The missing screw detection mechanism 4 using the above technical solution mainly consists of a first fixed guide plate 401, a second fixed guide plate 405, two second guide rods 402, a first push plate 404, a second push plate 409, a second cylinder 410, several second probes 403, and several second sensors 407. In use, the second cylinder 410 drives the first push plate 404, the second push plate 409, and the two second guide rods 402 to move towards the angle grinder pressing and fixing mechanism 2 on the first fixed guide plate 401 and the second fixed guide plate 405. At the same time, several second probes 403 move towards the angle grinder 6 and detect the screws at the corresponding positions on the angle grinder 6.

[0064] When the screw at the corresponding position on the angle grinder 6 has been installed, the screw at the corresponding position will block the movement of the second probe 403. At this time, the second probe 403 at the corresponding position will move closer to the second sensor 407 at the corresponding position. At this time, the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position will decrease. Then, the second sensor 407 at the corresponding position will generate an electrical signal and upload it to the control unit 5.

[0065] When the screw at the corresponding position on the angle grinder 6 is not installed, there will be a mounting hole at the corresponding position. The second probe 403 at the corresponding position will be inserted into the mounting hole at the corresponding position. At this time, the second probe 403 at the corresponding position will not move closer to the second sensor 407 at the corresponding position. At this time, the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position remains unchanged. The second sensor 407 at the corresponding position will not generate an electrical signal to be transmitted to the control unit 5. The control unit 5 can determine that the screw at this position has been missed.

[0066] Specifically, in this embodiment: to prevent the anti-collision sleeve 406 from damaging the second sensor 407, the anti-collision sleeve 406 is disposed between the second fixed guide plate 405 and the second push plate 409, and the anti-collision sleeve 406 at the corresponding position is disposed adjacent to the detection part of the second sensor 407 at the corresponding position. A buffer spring 411 is installed inside the anti-collision sleeve 406. In order for the buffer spring 411 to buffer the impact force when the anti-collision sleeve 406 contacts the second sensor 407, the buffer spring 411 is abutted between the end wall of the anti-collision sleeve 406 facing the second push plate 409 and the tail end of the second probe 403. Therefore, the buffer spring 411 can be used to prevent the anti-collision sleeve 406 from damaging the second sensor 407. At the same time, the buffer spring 411 increases the range of relative movement of the second probe 403. Therefore, the missing screw detection device can be used to detect angle grinders 6 of different sizes.

[0067] To ensure that the second probe 403 can automatically reset after the target is detected, the baffle 413 and the second reset spring 412 are both located between the first push plate 404 and the second fixed guide plate 405. The baffle 413 is located between the second reset spring 412 and the first push plate 404. The second reset spring 412 is used to drive the second probe 403 to reset. Under the action of the second reset spring 412, the baffle 413 abuts against the side of the first push plate 404 facing the second fixed guide plate 405. At the same time, under the action of the second reset spring 412, the end of the anti-collision sleeve 406 facing away from the second push plate 409 abuts against the side of the second fixed guide plate 405 facing the second push plate 409.

[0068] Specifically, in order to reduce the resistance when the two second guide rods 402 move, in this embodiment: two second linear bearings 408 are fixedly embedded on both the first fixed guide plate 401 and the second fixed guide plate 405, and the two second guide rods 402 are respectively set through the corresponding positions of the second linear bearings 408, and the side of the second guide rod 402 is slidably connected to the ball bearings on the inner wall of the second linear bearing 408.

[0069] Specifically, in order to realize the function of the control unit 5, in this embodiment: the control unit 5 includes a control box 501, a touch screen 502, a start switch 503, a red indicator light 506, a green indicator light 505, a buzzer 504, and a PLC controller. The control box 501 is fixedly installed on the upper part of the base plate 1. The touch screen 502, the start switch 503, the red indicator light 506, the green indicator light 505, and the buzzer 504 are all fixedly installed on the front of the control box 501. The PLC controller is fixedly installed inside the control box 501, and the PLC controller is electrically connected to the touch screen 502, the start switch 503, the red indicator light 506, the green indicator light 505, the buzzer 504, the clamping cylinder 203, the first cylinder 303, two first sensors 310, a second cylinder 410, and several second sensors 407.

[0070] The control unit 5 using the above technical solution mainly consists of a control box 501, a touch screen 502, a start switch 503, a red indicator light 506, a green indicator light 505, a buzzer 504, and a PLC controller. The PLC controller is used to receive electrical signals from two first sensors 310, several second sensors 407, and the start switch 503, and is also used to control the touch screen 502, the red indicator light 506, the green indicator light 505, the buzzer 504, the clamping cylinder 203, the first cylinder 303, and the second cylinder 410 to work automatically.

[0071] When a missing screw is detected, the PLC controller controls the red indicator light 506 to light up, simultaneously controls the buzzer 504 to sound an alarm, and controls the touch screen 502 to display the alarm information.

[0072] If no missing screws are detected, after the inspection is completed, the PLC controller will control the green indicator light 505 to light up and simultaneously control the touch screen 502 to display the inspection result information.

[0073] The start switch 503 is used to start the missing screw detection device with one key. When the angle grinder 6 to be tested is placed on the upper part of the positioning seat 201 and the support seat 202, and then the start switch 503 is pressed, the PLC controller controls the extension end of the clamping cylinder 203 to extend and drive the clamping cylinder 203 to clamp and fix the angle grinder 6 on the upper part of the positioning seat 201 and the support seat 202. At this time, the angle grinder 6 clamps the first probe 308. The first probe 308 moves closer to the detection part of the first sensor 310. At this time, the first sensor 310 detects that the angle grinder 6 is installed in place and generates an electrical signal to be transmitted to the PLC controller. The PLC controller then controls the missing screw detection mechanism 4 to work. At this time, the extension end of the second cylinder 410 extends and drives the first push plate 404, the second push plate 409 and the two second guide rods 402 to move toward the angle grinder 6 on the first fixed guide plate 401 and the second fixed guide plate 405. At the same time, several second probes 403 move toward the corresponding screws on the angle grinder 6.

[0074] When the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position decreases, it indicates that the screw at the corresponding position on the angle grinder 6 has been installed;

[0075] When the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position remains unchanged, it indicates that the screw at the corresponding position on the angle grinder 6 is not installed. When the screw at the corresponding position is detected to be not installed, the second sensor 407 at the corresponding position generates an electrical signal and uploads it to the PLC controller. The PLC controller controls the red indicator light 506 to light up, and at the same time controls the buzzer 504 to sound an alarm, and controls the touch screen 502 to display the alarm information.

[0076] Specifically, in this embodiment: in order to prevent the bottom of the angle grinder installation detection mechanism 3 from being damaged, a support leg 101 is fixedly installed at the bottom of the base plate 1. In order to facilitate the first probe 308 to pass through the base plate 1, a through groove is provided on the base plate 1 at the position corresponding to the first probe 308 for the first probe 308 to pass through.

[0077] In summary, the missing screw detection device provided in this embodiment has the following advantages:

[0078] The missing screw detection device mainly consists of a base plate 1, an angle grinder clamping and fixing mechanism 2, an angle grinder installation status detection mechanism 3, a missing screw detection mechanism 4, and a control unit 5. It can automatically detect all the screws that need to be inspected. Different operators can operate it and get the same detection results. It has the characteristics of reliable, fast, complete, and safe detection. It has high detection accuracy and good reliability and can effectively detect and solve the problem of missing screws.

[0079] When using:

[0080] Step 1: Place the angle grinder 6 to be tested on the upper part of the positioning base 201 and the support base 202;

[0081] Step 2: Press the start switch 503 once. The PLC controller controls the extension end of the clamping cylinder 203 to extend and drive the clamping cylinder 203 to clamp and fix the angle grinder 6 on the upper part of the positioning seat 201 and the support seat 202. At this time, the angle grinder 6 clamps the first probe 308. The first probe 308 moves closer to the detection part of the first sensor 310. At this time, the first sensor 310 detects that the angle grinder 6 is installed in place and generates an electrical signal to be transmitted to the PLC controller. The PLC controller then controls the missing screw detection mechanism 4 to work. At this time, the extension end of the second cylinder 410 extends and drives the first push plate 404, the second push plate 409 and the two second guide rods 402 to move toward the angle grinder 6 on the first fixed guide plate 401 and the second fixed guide plate 405. At the same time, several second probes 403 move toward the corresponding screws on the angle grinder 6.

[0082] When the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position decreases, it indicates that the screw at the corresponding position on the angle grinder 6 has been installed. When all the second sensors 407 detect that the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position has decreased, it indicates that the test is qualified. The PLC controller controls the green indicator light 505 to light up and controls the touch screen 502 to display the test qualification result information.

[0083] When the distance between the second sensor 407 at the corresponding position and the anti-collision sleeve 406 at the corresponding position remains unchanged, it indicates that the screw at the corresponding position on the angle grinder 6 is not installed. The second probe 403 is inserted into the mounting hole of the screw that is not installed. When it is detected that the screw at the corresponding position is not installed, the second sensor 407 at the corresponding position generates an electrical signal and uploads it to the PLC controller. The PLC controller controls the red indicator light 506 to light up, and at the same time controls the buzzer 504 to sound an alarm, and controls the touch screen 502 to display the alarm information.

[0084] It is worth noting that the model of the PLC controller, the first sensor 310 and the second sensor 407 is not limited in this embodiment. As long as the PLC controller, the first sensor 310 and the second sensor 407 can meet the functions of this embodiment, for example, the PLC controller model can be 6ES72350KD220XA8, and the first sensor 310 and the second sensor 407 can be distance sensors of model VL180.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting missing screws, characterized in that, include: The base plate serves as the mounting foundation for the missing screw detection device. An angle grinder clamping and fixing mechanism, which is used to clamp and fix the angle grinder to be tested; An angle grinder installation inspection mechanism is used to check whether the angle grinder clamping and fixing mechanism has clamped and fixed the angle grinder in place. A missing screw detection mechanism is used to detect whether an angle grinder has any missing screws. The control unit is electrically connected to the angle grinder clamping and fixing mechanism, the angle grinder installation status detection mechanism, and the missing screw detection mechanism, respectively, and is used to control the automatic operation of the angle grinder clamping and fixing mechanism, the angle grinder installation status detection mechanism, and the missing screw detection mechanism. Once the angle grinder installation detection mechanism detects that the angle grinder clamping and fixing mechanism has clamped and fixed the angle grinder in place, the control unit will then control the missing screw detection mechanism to detect whether there are any missing screws on the angle grinder, and the control unit will display the detection results. The angle grinder installation status detection mechanism is located below the angle grinder clamping and fixing mechanism. This mechanism includes a vertical plate, a first mounting plate, a second mounting plate, two first guide rods, a moving plate, a first cylinder, two mounting seats, and two first sensors. The vertical plate is vertically and fixedly installed on the bottom of the base plate. The first and second mounting plates are horizontally and fixedly installed on one side of the vertical plate. The two first guide rods are vertically and fixedly installed between the first and second mounting plates. The moving plate is horizontally and slidably fitted onto the two first guide rods. The first cylinder is fixedly installed on the side of the vertical plate, and the extension / retraction end of the first cylinder... The bottom of the movable plate is fixedly connected to the two mounting bases, both of which are fixedly mounted on the upper part of the movable plate. A guide cylinder is fixedly mounted inside the upper part of each mounting base. A round rod is movably mounted inside the guide cylinder. A first probe is fixedly mounted on the upper end of the round rod, and a first return spring is fitted onto the round rod. The first probe is located outside the upper part of the mounting base. The upper end of the first return spring is fixedly connected to the bottom end of the first probe, and the bottom end of the first return spring is fixedly connected to the inner wall of the guide cylinder. Two first sensors are fixedly embedded in the movable plate, and the detection parts of the two first sensors extend into the bottom of the two mounting bases respectively, used to detect whether the bottom end of the round rod is close to the probe. When the first probe is subjected to a force directed toward the first sensor, the first probe moves closer to the detection part of the first sensor; The missing screw detection mechanism is located near the angle grinder's clamping and fixing mechanism. The missing screw detection mechanism includes a first fixed guide plate, a second fixed guide plate, two second guide rods, a first push plate, a second push plate, a second cylinder, several second probes, and several second sensors. The first and second fixed guide plates are vertically and fixedly mounted on the upper part of the base plate. The two second guide rods are horizontally and slidably mounted on the first and second fixed guide plates. The first push plate is fixedly mounted on the two second guide rods, located between the first and second fixed guide plates. The second push plate is fixedly mounted on the two second guide rods, located on the side of the second fixed guide plate away from the first push plate. The second cylinder is fixedly mounted between the first and second fixed guide plates. The telescopic end of the cylinder is fixedly connected to one side of the second push plate facing the second fixed guide plate, and is used to drive the first push plate and the second push plate to move toward the angle grinder pressing and fixing mechanism. Several second probes are horizontally and slidably inserted into the first push plate. The head ends of several second probes are movably inserted through the first fixed guide plate, and the tail ends of several second probes are movably inserted through the second fixed guide plate. Each tail end of the second probe is slidably fitted with an anti-collision sleeve, and each second probe is fixedly fitted with a baffle plate. Each second probe is movably fitted with a second return spring. Several second sensors are fixedly embedded in the second push plate, and the number of the second sensors is the same as the number of the second probes. One second sensor corresponds to one second probe. The second sensor is used to detect whether the anti-collision sleeve at the corresponding position is close. The anti-collision sleeve is located between the second fixed guide plate and the second push plate, and a buffer spring is installed inside the anti-collision sleeve. The buffer spring abuts against the end wall of the anti-collision sleeve facing the second push plate and the tail end of the second probe. The buffer spring is used to prevent the anti-collision sleeve from damaging the second sensor. Both the baffle and the second reset spring are located between the first push plate and the second fixed guide plate, and the baffle is located between the second reset spring and the first push plate. The second reset spring is used to drive the second probe to reset. Under the action of the second reset spring, the baffle abuts against the side of the first push plate facing the second fixed guide plate. At the same time, under the action of the second reset spring, the end of the anti-collision sleeve facing away from the second push plate abuts against the side of the second fixed guide plate facing the second push plate. The control unit includes a control box, a touch screen, a start switch, a red indicator light, a green indicator light, a buzzer, and a PLC controller. The control box is fixedly installed on the upper part of the base plate. The touch screen, start switch, red indicator light, green indicator light, and buzzer are all fixedly installed on the front of the control box. The PLC controller is fixedly installed inside the control box and is electrically connected to the touch screen, start switch, red indicator light, green indicator light, buzzer, clamping cylinder, first cylinder, two first sensors, second cylinder, and several second sensors.

2. The screw-missing detection device according to claim 1, characterized in that, The angle grinder clamping and fixing mechanism includes a positioning seat, a support seat, a clamping cylinder, and a clamping block. The positioning seat, support seat, and clamping cylinder are all fixedly installed on the upper part of the base plate. The positioning seat is located between the support seat and the clamping cylinder, and the clamping block is fixedly installed at the telescopic end of the clamping cylinder.

3. The screw-missing detection device according to claim 2, characterized in that, Two first linear bearings are embedded in the movable plate, and two first guide rods are respectively set through the two first linear bearings, and the side of the first guide rod is slidably connected to the ball bearings on the inner wall of the first linear bearing.

4. The device for detecting missing screws according to claim 3, characterized in that, Two second linear bearings are fixedly embedded in both the first fixed guide plate and the second fixed guide plate. Two second guide rods are respectively installed through the corresponding positions of the second linear bearings, and the sides of the second guide rods are slidably connected to the balls on the inner wall of the second linear bearings.

5. The device for detecting missing screws according to claim 4, characterized in that, The bottom of the base plate is fixedly equipped with a support leg, and a through groove is provided on the base plate at the position corresponding to the first probe so that the first probe can pass through.

Images