A handheld metal detector performance automatic test bench and its working method

Abstract

The present invention discloses a handheld metal detector performance automatic test bench, which belongs to the technical field of metal detector testing equipment. It includes a test object automatic switching mechanism and a rotating lifting test mechanism arranged on one side thereof; the test object automatic switching mechanism includes: a test object automatic switching mechanism bench and a plurality of rollers triangularly mounted on the test object automatic switching mechanism bench, the plurality of rollers are connected by a conveyor belt transmission, a test object is fixed on the conveyor belts corresponding to the overlapped rollers, and a first driving part is installed on the test object automatic switching mechanism bench; the rotating lifting test mechanism includes: a rotating lifting mechanism bench and a test rod movably mounted on the rotating lifting mechanism bench, and a driving assembly is installed on the rotating lifting mechanism bench. The present invention has a high degree of automation. Compared with some existing handheld metal detector testing equipment, the present invention has a high degree of automation, high test accuracy, and a time-saving and labor-saving test process with high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of metal detector testing equipment, and in particular to a handheld metal detector performance automatic testing bench and a working method thereof. Background Art

[0002] With the continuous development of metal detection technology, the application of metal detectors has become increasingly broad, expanding to industrial production, security inspections, archaeological research, and other fields. As the application of handheld metal detectors expands, market requirements for handheld metal detectors in terms of sensitivity, metal detection accuracy, detection distance, and detection speed are becoming increasingly stringent. Testing the detection performance of handheld metal detectors has become a pressing issue, necessitating the development of handheld metal detector testing equipment. Currently, professional handheld metal detector testing equipment is scarce in my country, and even the existing handheld metal detector testing equipment has a low degree of automation and insufficient test accuracy.

[0003] Patent document CN204302515U mentions an automatic testing device for a handheld metal detector, which uses a slide rail and a slider in conjunction with a driving mechanism to change the distance between the test object and the detector, but cannot achieve horizontal movement and the test range is limited. The use of this structure in this application may lead to inaccurate test performance judgment. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic test bench for the performance of handheld metal detectors, which can test the detection performance of handheld metal detectors and other small metal detectors, including detection distance, detection sensitivity and other performance, and make the testing work more automated. The entire testing process is time-saving and labor-saving, with high efficiency, and the test results are highly accurate and have small errors.

[0005] To achieve the above-mentioned object, the present invention is implemented by adopting the following technical solutions: a handheld metal detector performance automatic test bench, which includes a test object automatic switching mechanism and a rotating lifting test mechanism arranged on one side thereof, wherein the test object automatic switching mechanism and the rotating lifting test mechanism are connected to a control module;

[0006] The test object automatic switching mechanism includes: a test object automatic switching mechanism stand and a plurality of rollers triangularly mounted on the test object automatic switching mechanism stand, the plurality of rollers being connected by a conveyor belt transmission, the test object being fixed on the conveyor belts corresponding to the rollers, and a first driving unit mounted on the test object automatic switching mechanism stand for switching and transferring the position of the test object;

[0007] The rotary lifting test mechanism includes: a rotary lifting mechanism frame and a test rod movably mounted on the rotary lifting mechanism frame, wherein a drive assembly is mounted on the rotary lifting mechanism frame to provide lifting and rotating power for the rotary lifting mechanism frame;

[0008] The control module controls the driving assembly and the first driving part to operate so that the testing rod detects the corresponding test object in multiple directions.

[0009] The test object automatic switching mechanism stand is provided with an installation cavity, and a T-shaped opening area is provided in the middle. A left driving roller is installed between the left side plates of the test object automatic switching mechanism stand through a rotating shaft, a right driving roller is installed between the right side plates through a rotating shaft, and a switching roller is installed between the top plates through a rotating shaft.

[0010] The first driving part includes: a switching motor, a left roller gear and a right roller gear;

[0011] The switching motor is fixedly mounted on the bottom wall of the T-shaped opening area of ​​the test object automatic switching mechanism stand, the left roller gear is fixedly mounted on one end of the rotating shaft of the left drive roller, and the right roller gear is fixedly mounted on one end of the rotating shaft of the right drive roller. The left switching motor gear and the right switching motor gear are also mounted on the output shaft of the switching motor, and the left switching motor gear and the left roller gear, and the right roller gear and the right switching motor gear are all connected by a chain.

[0012] The rotating lifting mechanism stand frame is vertically fixed with a slide rail, and a slider is slidably arranged on the slide rail. Two clamping plates are provided at the end of the slider away from the slide rail, and through holes are provided on the surfaces of the two clamping plates and a slide rod is installed with clearance fit. The two ends of the slide rod are correspondingly connected to the upper and lower baffles of the rotating lifting mechanism stand, and the test rod is fixedly installed on the slide rod between the two clamping plates; the driving assembly includes: a second driving part that controls the lifting and lowering of the test rod and a third driving part that rotates.

[0013] The second driving part includes: a lifting motor; the lifting motor is fixedly installed on the top of the side plate of the test object automatic switching mechanism stand, and the output shaft of the lifting motor passes through the side plate and is connected to the driving wheel, and the bottom end of the side plate of the test object automatic switching mechanism stand is installed with a driven wheel, and the driven wheel and the driving wheel are connected by a belt. The slider is provided with a plurality of support blocks at one end close to the slide rail, and the support blocks are engaged with the tooth grooves on the left inner wall of the belt. In practice, 2 to 4 support blocks can be provided to meet the requirements of use;

[0014] The third driving part is a rotating motor, which is mounted on the bottom end of the slide rod through a mounting plate, and the output shaft is fixedly connected to the end of the slide rod.

[0015] The test rod includes: a skateboard, one end of which is fixedly connected to the sliding rod between the two clamps, and the other end is equipped with a metal detector. For different metal detectors, the clamping mechanism for installing the metal detector can be equipped with different clamping devices, and a sound sensor is fixed on the board surface of the skateboard close to the sliding rod.

[0016] The middle section of the slide rod is a flat key shaft, and the flat key shaft and the slide plate can slide axially relative to each other and be radially limited.

[0017] The driven wheel and the driving wheel are made of special nylon, and the sliding rod, the sliding plate, the sliding block and the sliding rail are made of POM material.

[0018] The control module includes a display screen; the display screen displays five test modes: iron test, aluminum test, gold test, copper test and all-metal test. A plurality of function keys are also provided on the control module.

[0019] An automatic test bench for the performance of a handheld metal detector according to the above-mentioned method now provides a better working method. The bench has five working modes: mode one is iron testing, mode two is aluminum testing, mode three is gold testing, mode four is copper testing, and mode five is all-metal testing. The all-metal test starts with the first test object, iron, and after each cycle of testing is completed n times, it switches to the next test object and tests them one by one, and finally tests the detection distance of the metal detector to be tested for each metal. Other metal detection objects can be added to this mode as needed;

[0020] The test steps are as follows:

[0021] S1. Turn on the metal detector to be tested, select the detection mode, and then fix it to the slide, making sure the metal detector's induction coil is directly above the switching roller;

[0022] S2. Turn on the power switch, press the mode button, and select test mode;

[0023] S3. Press the cycle button and select the number of tests n;

[0024] S4. Press the start button to start the test;

[0025] S5. The test object automatically switches to the corresponding test object, and the metal detector returns to its initial position. The initial position is that the metal detector's detection plane is 1 meter above the test object (this distance can be adjusted, but must be ensured to exceed the current handheld metal detector's detection range for all metal detection objects), and the angle between the metal detector and the test object is 0 degrees;

[0026] S6. The metal detector slowly approaches the test object at a constant speed under the operation of the lifting mechanism;

[0027] S7. The metal detector alarms, the sound sensor receives the corresponding signal and feeds it back to the control module, which controls the metal detector to stop descending and raise it 50mm in the reverse direction;

[0028] S8. The metal detector 211 is rotated 90 degrees to the right under the operation of the rotating mechanism;

[0029] S9. The metal detector 211 rotates 180 degrees to the left at a constant speed, then 180 degrees to the right at a constant speed, and repeats this cycle 5 times.

[0030] S10. Whether the metal detector alarms 10 times, if so, proceed to step S12, otherwise proceed to step S11;

[0031] S11. The metal detector descends 1 mm (the descending step can be adjusted according to the detection accuracy), and steps S9 and S10 are executed;

[0032] S12. The lifting motor feeds back the total descending distance X to the control module, which records the detection distance 1000-Xmm;

[0033] S13 loop S5-S12 steps n times, the final test detection distance is the average of several test results;

[0034] S14. Press the print test result button to list the results of several tests and the final test result in a table and print them out.

[0035] According to the above technical solution, the present invention has at least the following beneficial effects:

[0036] 1) The present invention can be used to test the detection performance of handheld metal detectors and other small metal detectors, including detection distance, detection sensitivity and other performance. The drive assembly in the rotary lifting mechanism adjusts the lifting and lowering of the test rod and the rotation of the axis, and cooperates with the adjustable test object automatic switching mechanism. The cyclic test greatly improves the test precision and improves the test accuracy.

[0037] 2) The present invention has a high degree of automation. Compared with some existing handheld metal detector testing equipment, it has a high degree of automation and high test accuracy. During the test, the control module is started to control the operation of the automatic switching mechanism of the test object and the rotating and lifting test mechanism. This operation saves time and effort and is highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The figure shows the overall structure of a handheld metal detector automatic performance test bench of the present invention;

[0039] Figure 2Shows a schematic structural diagram of the test object automatic switching mechanism;

[0040] Figure 3 Shows a structural schematic diagram of the lifting mechanism;

[0041] Figure 4 shows a schematic structural diagram of the rotating mechanism;

[0042] Figure 5 Shows the slider and belt fixing structure;

[0043] Figure 6 The flat key shaft and the sliding plate limiting structure are shown;

[0044] Figure 7 shows a front schematic diagram of the control module;

[0045] Figure 8 The control principle block diagram of the handheld metal detector automatic performance test bench control system of the present invention is shown;

[0046] Figure 9 A workflow diagram for a single metal test of the present invention is shown;

[0047] Figure 10 Shown is a workflow diagram of the all-metal test of the present invention;

[0048] in:

[0049] 1- Automatic test object switching mechanism, 11- Automatic test object switching mechanism stand, 12- Conveyor belt, 13- Left roller gear, 14- Right roller gear, 15- Switching motor, 16- Switching roller, 17- Left drive roller, 18- Right drive roller, 19- Left switching motor gear, 110- Right switching motor gear, 111- Iron test object, 112- Aluminum test object, 113- Gold test object, 114- Left drive chain, 115- Right drive chain, 116- Flat key No. 1, 117- Flat key No. 2, 118- Flat key No. 3, 119- Flat key No. 4; 2- Rotary lifting test mechanism, 21- Rotary lifting mechanism stand, 22- Lifting motor, 23- Slide rod, 24- Slider, 25- Slide rail, 26- Rotating motor, 27- Drive wheel, 28- Flat key No. 5, 29- Belt, 210-driven wheel, 211-metal detector, 212-No. 1 fixing bolt, 213-No. 2 fixing bolt, 214-sound sensor, 215-slide plate; 3-control module, 31-display screen. DETAILED DESCRIPTION

[0050] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0051] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position 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, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] like Figure 1 As shown, the present invention provides a handheld metal detector performance automatic test bench, which includes an automatic switching mechanism 1 for a test object, a rotating and lifting test mechanism 2, and a control module 3. The rotating and lifting test mechanism 2 is located above the automatic switching mechanism 1 for the test object. The rotating and lifting test mechanism 2 and the automatic switching mechanism 1 for the test object are controlled by the control module 3. The rotating and lifting test mechanism 2 realizes the movement of the metal detector, and the automatic switching mechanism 1 for the test object realizes the switching of the test object.

[0053] Further, if Figure 1 、 2 As shown, the test object automatic switching mechanism includes: a test object automatic switching mechanism stand 11, a conveyor belt 12, a left roller gear 13, a right roller gear 14, a switching motor and its drive circuit 15, a switching roller 16, a left drive roller 17, a right drive roller 18, a left switching motor gear 19, a right switching motor gear 110, an iron test object 111, an aluminum test object 112, a gold test object 113, a left transmission chain 114, a right transmission chain 115, a No. 1 flat key 116, a No. 2 flat key 117, a No. 3 flat key 118, and a No. 4 flat key; both ends of the conveyor belt 12 are fixed on the left drive roller 17 and the right drive roller 18, and part of the conveyor belt 12 is wound on the two drive rollers. The middle part is hung on the switching roller 16; the iron test object 111, the aluminum test object 112, and the gold test object 113 are fixed on the conveyor belt 12; the left roller gear 13 and the left drive roller 17, the right roller gear 14 and the right drive roller 18, the left switching motor gear 19, the right switching motor gear 110 and the switching motor 15 are connected together through corresponding flat keys; the two ends of the left transmission chain 114 are connected to the left roller gear 13 and the left switching motor gear 19; the two ends of the right transmission chain 115 are connected to the right roller gear 14 and the right switching motor gear 110; that is, when the motor is started, the power is transmitted to the drive roller through the gear and the transmission chain.

[0054] Specifically, such as Figure 2As shown, when the switching motor 15 is activated, power is transmitted to the drive roller via the gears and transmission chain, causing the conveyor belt to move left or right, thereby switching the test object. The switching motor 15 uses a stepper motor, and the ends of the conveyor belt 12 are fixed to the left drive roller 17 and the right drive roller 18. This can accurately control the conveyor belt's transmission distance, thereby achieving accurate switching of the test object.

[0055] Further, if Figure 3 、 Figure 4 As shown, the rotary lifting test mechanism includes: a rotary lifting test mechanism stand 21, a lifting motor 22, a slide bar 23, a slider 24, a slide rail 25, a rotary motor 26, a driving wheel 27, a number five flat key 28, a belt 29, a driven wheel 210, a metal detector 211, a sound sensor 214, and a slide plate 215; the slide rail 25 is arranged on the left and right sides of the rotary lifting mechanism stand 21; the slider 24 is arranged on the slide rail 25, and one side of the slider 24 is fixedly connected to the left inner side of the belt 29, and the slide bar 23 passes through the through holes of the two splints on the slider 24; one end of the slide bar 23 is rotatably mounted in the baffle at the top of the rotary lifting mechanism stand 21, and the other end of the slide bar 23 is fixed together with the rotary motor 26; the slide plate 215 is fixed between the upper and lower baffles of the slider 24, and the slide plate 215 has a mounting hole. The mounting hole is connected with the slide bar 23 by interference fit, and the sound sensor 214 is installed on the slide bar 215. When the metal detector 211 alarms, the sound sensor 214 receives the corresponding signal and feeds back to the control module 3; the lifting motor 22 is arranged behind the rotary lifting test bench 21, and the lifting motor 22 drives the slider 24 and the slide bar 215 to perform lifting and lowering movements along the linear slide rail 25 through the driving wheel 27 and the belt 29; the rotating motor 26 is arranged on a baffle of the rotary lifting mechanism bench 21, and the rotating motor 26 drives the slide bar 23 to rotate radially, thereby driving the slide bar 215 to rotate; the metal detector 211 is arranged at the tail end of the slide bar 215, and is fixed to the front end of the slide bar 215 using the No. 1 fixing bolt 212 and the No. 2 fixing bolt 213, and the metal detector 211 moves synchronously with the slide bar 215.

[0056] Further, if Figure 3 、 Figure 4 As shown, the inner protrusions of the belt 29 engage with the protrusions on the driving wheel 27 and the driven wheel 210. In actual production, the belt 29 is specifically a synchronous belt, and the driving wheel 27 and the driven wheel 210 are specifically synchronous pulleys.

[0057] The lifting motor 22 uses a stepping motor to ensure the lifting distance of the slider 24; the rotating motor 26 uses a stepping motor to ensure the rotation angle of the slide plate;

[0058] Further, if Figure 5 As shown, the slider 24 is provided with a plurality of support blocks at one end close to the slide rail 25, and the support blocks are stuck in the tooth grooves on the left inner wall of the belt 29;

[0059] Further, if Figure 6 As shown, the middle section of the slide rod 23 is a flat key shaft, and the flat key shaft and the slide plate 215 can slide axially relative to each other and be radially limited.

[0060] Specifically, the slide 215 acts as the actuator for both lifting and rotating motions. In practical applications, the metal detector 211 is secured to the slide 215 (different clamping devices can be used for different metal detectors). The lift motor 22 and the rotation motor 26 drive the slide 215, which in turn drives the detector 211 in a predetermined circular motion. The lift and rotation of the slide 215 can be performed simultaneously or in separate steps.

[0061] Further, if Figure 7 As shown, the control module 3 includes a plurality of control buttons and a display screen 31. The functions of the control buttons are as follows: Mode - select the working mode. There are five test modes on the display screen 31, namely, mode 1 is iron test, mode 2 is aluminum test, mode 3 is gold test, mode 4 is copper test, and mode 5 is all metal test. The five modes can be selected in a cycle; Cycle - set the number of tests, wherein the type of metal can be changed as needed, or other metal detection objects can be added. There are three test times on the display screen 31, namely, 3 times, 5 times, and 10 times. The three times can be selected in a cycle; Print test results - list the results of several tests and the final result of the test in a table and print them out; Power switch - control the entire Connect the power supply of the test bench; Start - the handheld metal detector performance automatic test bench starts working according to the pre-set settings; Reset - the slide position returns to the initial position; the initial position of the slide 215 is 1 meter above the test object (this distance can be adjusted, but it must be ensured that it exceeds the detection distance of the current handheld metal detector for all metal detection objects), and the angle between the slide 215 and the test object is 0 degrees; Pause - the handheld metal detector performance automatic test bench stops working; Rise - the slider rises; Descend - the slider descends; Turn left - the slide turns left; Turn right - the slide turns right; Among them, the reset, pause, rise, descend, turn left, and turn right buttons are used when there is a problem with the bench machine.

[0062] The control module 3 can control the operation of the lifting and rotating mechanism 2 and the test object automatic switching mechanism 1. The switching motor and its drive circuit 15 in the rotating lifting and testing mechanism 1 and the lifting motor 22 and rotating motor 26 in the test object automatic switching mechanism 2 are in communication with the control module 3. The automatic switching of the test object model and the lifting and rotating of the metal detector can be controlled by the control module 3. The control module 3 can be, for example, but not limited to, a PLC control module or a single-chip microcomputer control module.

[0063] Further, if Figure 8 As shown, the control module 3 operates the left switching motor 15, the lifting motor 22, and the rotating motor 26 through corresponding drive circuits. The corresponding drive circuits can all be implemented using existing technologies. The control module 3 is also connected to an acoustic sensor 214 and the lifting motor 22. The acoustic sensor 214 is used to receive alarm signals from the metal detector, and the lifting motor 22 is used to record the linear travel distance of the metal detector. Furthermore, the control module 3 is equipped with a mode button, a cycle button, a start button, and a power switch. After setting the corresponding parameters in advance and pressing the start switch, the handheld metal detector automatic performance test bench can automatically complete the metal detector performance test.

[0064] Optionally, the materials selected for the automatic test bench for the performance of the handheld metal detector should all be non-metallic materials except for the control module, the motor and its drive circuit and the sound sensor.

[0065] Example 2

[0066] Based on Example 1, the present invention also provides a method for operating a handheld metal detector performance automatic test bench. The method includes: a control module 3 controls a rotary lifting test mechanism 2 to achieve the movement of a metal detector 211, and controls a test object automatic switching mechanism 1 to achieve the switching of test objects. The bench has five operating modes: mode 1 is iron testing, mode 2 is aluminum testing, mode 3 is iron testing, mode 4 is copper testing, and mode 5 is all-metal testing. The all-metal test starts with the first test object, iron, and after each cycle of testing is completed n times, it switches to the next test object and tests them one by one, ultimately testing the detection distance of the metal detector to be tested for each metal. As needed, this mode can add other metal detection objects.

[0067] Specifically, the method by which the control module 3 controls the rotating lifting test mechanism 2 to realize the movement of the metal detector 211 includes: the control module 3 controls the switching motor 15 to start, and the power is transmitted to the drive roller through the gears and the transmission chain, and the conveyor belt transmits to the left or right, thereby realizing the switching of the test object.

[0068] Specifically, the control module 3 controls the test object automatic switching mechanism 1 to realize the switching of the test object. The method includes: the metal detector 211 is fixed on the slide 215, the control module 3 controls the lifting motor 22 and the rotating motor 26 to start, the power of the lifting motor 22 is transmitted to the slide 215 through the driving wheel 27, the belt 29 and the slider 24, and the power of the rotating motor 26 is transmitted to the slide 215 through the slide rod 23, driving the slide 215 to drive the metal detector 211 to perform a preset movement.

[0069] like Figure 9 、 Figure 10 As shown, the specific implementation of the handheld metal detector performance automatic test bench of the present invention is as follows:

[0070] The test bench has five working modes, mode one is iron test, mode two is aluminum test, mode three is iron test, mode four is copper test mode, and mode five is all-metal test. The all-metal test starts with the first test object, iron. After each cycle of testing is completed n times, it switches to the next test object and detects them one by one, and finally tests the detection distance of the metal detector to each metal.

[0071] The specific implementation of the handheld metal detector performance automatic test bench is as follows:

[0072] S1. Turn on the metal detector to be tested, select the detection mode, and then fix it on the slide, making sure that the induction coil of the metal detector is directly above the switching roller.

[0073] S2. Turn on the power switch, press the mode button and select test mode.

[0074] S3. Press the cycle button and select the number of tests n.

[0075] S4. Press the start button and the test begins.

[0076] S5. The test object automatically switches to the corresponding test object, and the metal detector 211 returns to its initial position. In the initial position, the detection plane of the metal detector 211 is 1 meter above the test object (this distance can be adjusted, but must be greater than the detection range of the current handheld metal detector for all metal detection objects), and the angle between the metal detector 211 and the test object is 0 degrees.

[0077] S6. The metal detector 211 approaches the test object slowly and uniformly under the operation of the lifting mechanism.

[0078] S7. The metal detector 211 sounds an alarm, and the sound sensor 214 receives the corresponding signal and feeds it back to the control module. The control module controls the metal detector to stop descending and to rise 50 mm in the reverse direction.

[0079] S8. The metal detector 211 rotates 90 degrees to the right under the operation of the rotating mechanism.

[0080] S9. Under the operation of the rotating mechanism, the metal detector 211 first rotates 180 degrees to the left at a constant speed, then rotates 180 degrees to the right at a constant speed, and repeats this cycle 5 times.

[0081] S10. Has the metal detector 211 alarmed 10 times? If so, go to step S12; otherwise, go to step S11.

[0082] S11. The metal detector 211 descends 1 mm (the descending step can be adjusted according to the detection accuracy), and steps S9 and S10 are executed.

[0083] S12. The lifting motor 22 feeds back the total descending distance X to the control module, and the control module records the detection distance 1000-X mm.

[0084] S13. Loop through steps S5-S12 n times, and the final detection distance is the average of all test results.

[0085] S14. Press the print test result button to list the results of several tests and the final test result in a table and print them out.

[0086] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A handheld metal detector performance automatic test bench, characterized in that: The invention comprises a test object automatic switching mechanism (1) and a rotary lifting test mechanism (2) arranged on one side thereof, wherein the test object automatic switching mechanism (1) and the rotary lifting test mechanism (2) are connected to a control module (3); the test object automatic switching mechanism (1) comprises: a test object automatic switching mechanism stand (11) and a plurality of rollers triangularly mounted on the test object automatic switching mechanism stand (11), wherein the plurality of rollers are connected to each other through a conveyor belt (12), and a test object is fixed on the conveyor belt (12) corresponding to the overlapped rollers; a first driving unit is mounted on the test object automatic switching mechanism stand (11) for switching and transferring the position of the test object; the rotary lifting test mechanism (2) comprises: a rotary lifting mechanism stand (21) and a test rod movably mounted on the rotary lifting mechanism stand (21), and a driving assembly is mounted on the rotary lifting mechanism stand (21) for providing lifting and rotating power for the rotary lifting mechanism stand (21); the control module controls the driving assembly and the first driving unit to operate so that the test rod can detect the corresponding test object in multiple directions; The test object automatic switching mechanism stand (11) is provided with an installation cavity, and a T-shaped opening area is provided in the middle. A left driving roller (17) is installed between the left side platforms of the test object automatic switching mechanism stand (11) via a rotating shaft, a right driving roller (18) is installed between the right side platforms via a rotating shaft, and a switching roller (16) is installed between the top platforms via a rotating shaft.

2. The automatic test bench for handheld metal detector performance according to claim 1, characterized in that: The first driving part comprises: a switching motor (15), a left roller gear (13) and a right roller gear (14); the switching motor (15) is fixedly mounted on the bottom wall of the T-shaped opening area of ​​the test object automatic switching mechanism stand (11); the left roller gear (13) is fixedly mounted on one end of the rotating shaft of the left driving roller (17); the right roller gear (14) is fixedly mounted on one end of the rotating shaft of the right driving roller (18); a left switching motor gear (19) and a right switching motor gear (110) are also mounted on the output shaft of the switching motor (15); the left switching motor gear (19) and the left roller gear (13), and the right roller gear (14) and the right switching motor gear (110) are all connected by chains.

3. The automatic test bench for handheld metal detector performance according to claim 1, characterized in that: The rotating lifting mechanism stand (21) is vertically fixed with a slide rail (25), and a slider (24) is slidably arranged on the slide rail (25). Two clamping plates are provided at one end of the slider (24) away from the slide rail (25), and through holes are provided on the surfaces of the two clamping plates, and a slide rod (23) is installed with clearance fit. The two ends of the slide rod (23) are correspondingly connected to the upper and lower baffles of the rotating lifting mechanism stand (21), and the test rod is fixedly installed on the slide rod (23) between the two clamping plates. The driving assembly includes: a second driving part for controlling the lifting of the test rod and a third driving part for rotating the test rod.

4. The automatic test bench for handheld metal detector performance according to claim 3, characterized in that: The second driving part comprises: a lifting motor (22); the lifting motor (22) is fixedly mounted on the top of the side plate of the test object automatic switching mechanism stand (11), and the output shaft of the lifting motor (22) passes through the side plate and is connected to a driving wheel (27); the bottom end of the side plate of the test object automatic switching mechanism stand (11) is mounted with a driven wheel (210), a belt (29) is connected between the driven wheel (210) and the driving wheel (27), and a plurality of support blocks are provided at one end of the slider (24) close to the slide rail (25), and the support blocks are engaged with the tooth grooves on the left inner wall of the belt (29); the third driving part is a rotating motor (26), which is mounted on the bottom end of the slide rod (23) through a mounting plate, and the output shaft is fixedly connected to the end of the slide rod (23).

5. The automatic test bench for handheld metal detector performance according to claim 4, characterized in that: The test rod comprises a slide plate (215), one end of the slide plate (215) is fixedly connected to the slide bar (23) between the two clamping plates, the other end of the slide plate (215) is equipped with a metal detector (211), and a sound sensor (214) is fixed on the surface of the slide plate (215) close to the slide bar (23).

6. The automatic test bench for handheld metal detector performance according to claim 5, characterized in that: The middle section of the slide rod (23) is a flat key shaft, and the flat key shaft and the slide plate (215) can slide relative to each other in the axial direction and be radially limited.

7. The automatic performance test bench for a handheld metal detector according to claim 4, characterized in that: The driven wheel (210) and the driving wheel (27) are made of special nylon, and the slide bar (23), the slide plate (215), the slider (24) and the slide rail (25) are made of POM material.

8. The automatic test bench for handheld metal detector performance according to claim 1, characterized in that: The control module comprises a display screen (31); the display screen (31) displays five test modes, namely, iron test, aluminum test, gold test, copper test and full metal test; and a plurality of function keys are also provided on the control module.

9. A method for operating the handheld metal detector automatic performance test bench according to any one of claims 1 to 8, characterized in that: The test bench has five working modes: mode one is iron test, mode two is aluminum test, mode three is gold test, mode four is copper test, and mode five is all-metal test. The all-metal test starts with the first test object, iron. After each cycle of testing is completed n times, it switches to the next test object and tests them one by one. Finally, the detection distance of the metal detector to each metal is tested. The test steps are as follows: S1. Turn on the metal detector (211) to be tested, select the detection mode, and then fix it on the slide (215), and ensure that the induction coil of the metal detector is directly above the switching roller (16); S2. Turn on the power switch, press the mode button, and select test mode; S3. Press the cycle button and select the number of tests n; S4. Press the start button to start the test; S5. The test object is automatically switched to the corresponding test object, and the metal detector (211) returns to the initial position. The initial position is that the detection plane of the metal detector (211) is 1 meter above the test object. This distance can be adjusted, but it must be ensured that it exceeds the detection distance of the current handheld metal detector for all metal detection objects, and the angle between the metal detector (211) and the test object is 0 degrees; S6. The metal detector (211) approaches the test object slowly and uniformly under the operation of the lifting mechanism; S7. The metal detector (211) alarms, the sound sensor (214) receives the corresponding signal and feeds it back to the control module, which controls the metal detector to stop descending and reversely lift 50mm; S8. The metal detector (211) is in operation by rotating the mechanism, and is rotated 90 degrees to the right; S9. The metal detector (211) rotates 180 degrees to the left at a constant speed, then 180 degrees to the right at a constant speed, and repeats the cycle 5 times. S10. Whether the metal detector (211) alarms 10 times, if so, proceed to step S12, otherwise proceed to step S11; S11. The metal detector drops 1mm. The distance the metal detector drops can be adjusted according to the detection accuracy. Steps S9 and S10 are executed. S12. The lifting motor (22) feeds back the total descending distance X to the control module, which records the detection distance 1000-Xmm; S13. Loop through steps S5-S12 n times, and the final detection distance is the average of all test results. S14. Press the print test result button to list the results of several tests and the final test result in a table and print them out.

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