A PLC Function Testing Device and Testing Method

Abstract

The present invention belongs to the technical field of PLC function testing. Specifically, it is a PLC function testing device and testing method, which includes an impact testing device and a current-voltage monitoring device installed on one side of the impact testing device. A voltage dip simulation device and an aging device are arranged on the outer side of the impact testing device. A lifting plate is movably installed at the upper position of the impact testing device, and the PLC body is movably installed on the lower side of the lifting plate. A plurality of blocking plates are movably installed on the inner walls on both sides of the impact testing device. By making the PLC body in the horizontal state contact and collide with the blocking plates multiple times, the current-voltage data of the PLC body when it is installed inside the device and is subjected to bumps is monitored. Moreover, this monitoring is carried out under the condition of the aging of the PLC body and the voltage drop. Through the functional testing of the PLC body under extreme conditions, it is confirmed whether the PLC body is qualified. The qualification of the PLC under this kind of testing is more authentic.

Description

Technical Field

[0001] The present invention belongs to the field of PLC function testing, and specifically relates to a PLC function testing device and a testing method. Background Art

[0002] The PLC (Programmable Logic Controller) function test refers to performing various tests on the PLC to verify whether its operation and functions meet the expected requirements. The function test of the PLC is usually carried out on the premise of simulating normal use in a real environment. However, in a real environment, factors such as the aging of the PLC, the drop in supply voltage, and the external impact on the PLC will all affect the function of the PLC. Therefore, it is necessary to simulate these factors to test the function of the PLC before it is actually installed.

[0003] A patent document with the publication number CN110609224A discloses a PLC testing device and method, including a frame, a heating component, and an assembly testing component; the heating component is used to provide hot air flow to the tested PLC; the assembly testing component includes a bottom plate, a module upper platform, a clamping device, and a probe component. The probe component includes an input probe component and an output probe component. The present invention has a relatively high degree of automation and can directly perform tests on the PLC after aging; moreover, the present invention can age and test multiple PLCs, reducing the equipment cost of aging tests for multiple PLCs.

[0004] In the above technical solution, the PLC is accelerated to age by means of heating and increasing the current, and then the current and voltage of the aged PLC are monitored to complete the function detection. However, in actual working conditions, in many cases, a normally aged PLC will also be affected by a voltage drop and external impact. Therefore, it is also necessary to perform functional detection on the aged PLC under the condition of voltage drop or external impact. Moreover, in some cases, the aged PLC will be affected by both a voltage drop and an external impact during a fall. In order to ensure the normal use of the PLC, it is necessary to perform function detection on the PLC when multiple factors occur simultaneously.

[0005] Therefore, the present invention provides a PLC function testing device and a testing method. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A PLC function testing device described in the present invention includes an impact testing device and a current and voltage monitoring device installed on one side of the impact testing device. A voltage dip simulation device and an aging device are arranged outside the impact testing device. The impact testing device is used to place the PLC body. The aging device includes a heating component, a power switch, and a current limiter. The aging device is used to age the PLC body;

[0008] The voltage dip simulation device includes a power supply module, a voltage dip simulation controller, a load module, a measurement and monitoring module, and a temperature monitoring module. The current and voltage monitoring device is used to monitor the current and voltage of the PLC body. The voltage dip simulation device is used to simulate the voltage drop situation occurring in the power system;

[0009] A lifting plate is movably installed at the upper position of the impact testing device. The PLC body is movably installed on the lower side of the lifting plate. A plurality of blocking plates are movably installed on the inner walls on both sides of the impact testing device. The voltage dip simulation device, the current and voltage monitoring device, and the aging device are electrically connected to the PLC body through connection probes.

[0010] Preferably, the impact testing device includes a base plate, two guide rail plates fixedly arranged on the upper side of the base plate, and four guide columns. The impact testing device further includes a top plate fixedly installed on the upper sides of the two guide rail plates. A cross vertical groove is formed inside the guide rail plate.

[0011] Preferably, a sliding plate is movably installed inside the cross vertical groove. A plurality of U-shaped strips are fixedly installed on one side of the sliding plate facing the center position of the impact testing device. The blocking plate is embedded inside the U-shaped strip. The length of the blocking plate is longer than the length of the U-shaped strip.

[0012] Preferably, a plurality of lifting components are installed inside the top plate. The lifting component includes a fixedly installed first motor and a first winding wheel fixedly installed on the output shaft of the first motor. A metal wire is wound around the outside of the first winding wheel. One ends of the plurality of metal wires are fixedly connected to the upper side of the lifting plate.

[0013] Preferably, an electrically driven component is movably installed inside the lifting plate. A clamping component is arranged on the upper side of the PLC body. The clamping component includes a strip-shaped housing and an adjusting column movably arranged inside the strip-shaped housing. Two moving clamping plates are movably installed on the lower side of the strip-shaped housing.

[0014] Preferably, a forward lead screw is fixedly installed at one end of the adjusting column, and a reverse lead screw is fixedly installed at the other end of the adjusting column. The upper part of one group of the movable clamping plates is in screw connection with the forward lead screw, and the upper part of the other group of the movable clamping plates is in screw connection with the reverse lead screw. An infrared sensor is fixedly installed on the lower side of the movable clamping plate.

[0015] Preferably, a first winding rope and a second winding rope are wound on both sides of the electric drive assembly. One ends of the first winding rope and the second winding rope are fixedly connected to the upper side of the strip-shaped housing. A component groove, a limiting strip groove and an arc groove are formed inside the lifting plate. The component groove, the limiting strip groove and the arc groove are communicated with each other. The first winding rope and the second winding rope are arranged inside the limiting strip groove and the arc groove.

[0016] Preferably, the electric drive assembly includes a second motor fixedly installed inside the component groove. A first gear is connected to the lower side of the second motor through an output shaft. A second gear and a third gear are arranged outside the first gear. A second winding wheel is fixedly connected to the lower side of the second gear. A third winding wheel is fixedly connected to the lower side of the third gear. The first winding rope is wound outside the third winding wheel. The second winding rope is wound outside the second winding wheel. The second winding wheel and the third winding wheel are movably installed inside the component groove through a shaft.

[0017] A testing method for PLC functions, which adopts the above-mentioned PLC function testing device, includes the following steps:

[0018] Step 1: Preparation work: Prepare the PLC body, clamp the PLC body through the clamping assembly, and place the PLC body directly below the lifting plate;

[0019] Step 2: Aging test: Electrically connect the aging device to the PLC body, the PLC body is accelerated aging, the aged PLC body works normally, electrically connect the current and voltage monitoring device to the PLC body at this time, monitor whether the current and voltage of the PLC body change, and observe whether the aged PLC body is working stably;

[0020] Step 3: Voltage drop test after aging: The aging device is no longer electrically connected to the PLC body. Let the current and voltage monitoring device and the voltage drop simulation device be electrically connected to the PLC body at the same time. The voltage drop simulation device is used to simulate the voltage drop situation in the power system. The current and voltage monitoring device tests the output current and voltage of the PLC body under the condition of voltage drop, and observes whether the PLC body is working stably at this time;

[0021] Step 4: Impact test after aging; In the above steps, the PLC body has been aged. The lifting of the lifting plate in the impact test device drives the lifting of the PLC body, causing the PLC body to contact and collide with the blocking plate to test the output of voltage and current when the aged PLC body is collided. This output is monitored by the current and voltage monitoring device;

[0022] Step 5: Voltage drop and impact test after aging: Connect the aged PLC body to the current and voltage monitoring device and the voltage drop simulation device electrically at the same time. And at this time, the impact test device conducts an impact test. During the impact test, the current and voltage monitoring device monitors the current and voltage.

[0023] Preferably, when the second step is carried out, the heating component in the aging device outputs an air flow of 40°C - 60°C into the PLC body, and the power switch and the current limiter increase the current output to the PLC body by 10% - 50%;

[0024] The voltage drop simulation device drops the voltage to 80% - 90% of the rated voltage of the PLC body.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. For a PLC function test device and test method of the present invention, on the premise that the PLC body is in rapid aging, then let the PLC body be in a situation of voltage drop. At this time, the current and voltage monitoring device is used to monitor the current and voltage of the PLC body again to complete the function test of the PLC once again, to see whether the produced PLC can be used normally under these two factors, improving the comprehensiveness of the test.

[0027] 2. For a PLC function test device and test method of the present invention, the lifting of the lifting plate is driven electrically, so that the lifting plate can drive the PLC body arranged below the lifting plate to lift and lower. When the lifting plate drives the PLC body to descend, the PLC body will collide with the blocking plate during the descent. In this case, the loosening of the internal electronic components of the PLC body will affect the normal use. The current and voltage monitoring device monitors the current and voltage of the PLC body to see whether the PLC body is working normally, simulating the situation where the PLC body is impacted when it contacts and collides with an external object during the falling process, and testing the PLC function more comprehensively.

[0028] 3. For a PLC function testing device and testing method according to the present invention, when the PLC body collides with the blocking plate, the PLC body changes from a horizontal state to an inclined state. Driven by the second motor, with the cooperation of the first winding rope and the second winding rope, the PLC body quickly changes from the inclined state to the horizontal state, and contacts and collides with the next group of blocking plates in the horizontal state. The scenario of each contact and collision between the PLC body and the blocking plate is planned to avoid the situation that the PLC body flips or rotates significantly after contacting multiple groups of blocking plates during the falling process. The flipping and significant rotation of the PLC body will cause the electrical connections between various devices and the PLC body to become loose, thereby affecting the function testing of the PLC body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 is the overall module diagram of the present invention;

[0031] Figure 2 is the module diagram of the voltage sag simulation device in the present invention;

[0032] Figure 3 is the three-dimensional schematic diagram of the impact testing device and the PLC body in the present invention;

[0033] Figure 4 is the three-dimensional schematic diagram of the top plate and the cross vertical groove in the present invention;

[0034] Figure 5 is the three-dimensional schematic diagram of the sliding plate and the blocking plate in the present invention;

[0035] Figure 6 is the three-dimensional schematic diagram of the lifting plate and the lifting assembly in the present invention;

[0036] Figure 7 is the three-dimensional schematic diagram of the electrical driving assembly and the clamping assembly in the present invention;

[0037] Figure 8 is the three-dimensional schematic diagram of the adjusting column and the movable clamping plate in the present invention;

[0038] Figure 9 is the exploded view of the lifting plate in the present invention;

[0039] Figure 10 is the exploded view of the electrical driving assembly in the present invention;

[0040] In the figure: 1. PLC main body; 2. Current and voltage monitoring device; 3. Impact test device; 31. Base plate; 32. Guide rail plate; 33. Guide post; 34. Top plate; 35. Cross vertical groove; 351. Sliding plate; 352. U-shaped strip; 36. Lifting assembly; 361. First motor; 362. First winding wheel; 363. Metal wire; 4. Voltage sag simulation device; 41. Power supply module; 42. Voltage sag simulation controller; 43. Load module; 44. Measurement and monitoring module; 45. Temperature monitoring module; 5. Aging device; 51. Heating assembly; 52. Power switch; 53. Current limiter; 6. Lifting plate; 61. Component groove; 62. Limiting strip groove; 63. Arc groove; 7. Obstructing plate; 8. Electric drive assembly; 81. First winding rope; 82. Second winding rope; 83. Second motor; 84. First gear; 85. Second gear; 86. Second winding wheel; 87. Third gear; 88. Third winding wheel; 9. Clamping assembly; 91. Adjusting column; 911. Forward screw rod; 912. Reverse screw rod; 92. Strip-shaped housing; 93. Movable clamping plate; 931. Infrared sensor. Detailed implementation manners

[0041] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0042] Embodiment 1

[0043] As Figure 1-3 shown, a PLC function test device according to an embodiment of the present invention includes an impact test device 3 and a current and voltage monitoring device 2 installed on one side of the impact test device 3. A voltage sag simulation device 4 and an aging device 5 are arranged outside the impact test device 3. The impact test device 3 is used to place the PLC main body 1. The aging device 5 includes a heating assembly 51, a power switch 52 and a current limiter 53. The aging device 5 is used to age the PLC main body 1;

[0044] The voltage sag simulation device 4 includes a power supply module 41, a voltage sag simulation controller 42, a load module 43, a measurement and monitoring module 44 and a temperature monitoring module 45. The current and voltage monitoring device 2 is used to monitor the current and voltage of the PLC main body 1. The voltage sag simulation device 4 is used to simulate the voltage drop situation occurring in the power system;

[0045] A lifting plate 6 is movably installed at the upper position of the impact test device 3. The PLC main body 1 is movably installed on the lower side of the lifting plate 6. A plurality of obstructing plates 7 are movably installed on both inner walls of the impact test device 3. The voltage sag simulation device 4, the current and voltage monitoring device 2 and the aging device 5 are electrically connected to the PLC main body 1 through connection probes.

[0046] Specifically, the current and voltage monitoring device 2 is used to monitor the current and voltage of the PLC. The voltage sag simulation device 4 is used to simulate the voltage drop situation that may occur in the power system to check whether the current and voltage of the PLC are stable under this condition. The power supply module 41 is used to provide the required voltage and current to the voltage sag simulation device 4. It usually includes a transformer, a rectifier, and a voltage regulator to ensure that the voltage supplied to the simulator is stable and meets the requirements. The voltage sag simulation controller 42 is used to generate and control the simulated voltage drop situation. It is usually composed of a microprocessor or a microcontroller and has relevant algorithms and logics. The load module 43 is used to simulate the load in the actual power system. It can include adjustable resistors, inductors, and capacitors to simulate different types and sizes of loads. The measurement and monitoring module 44 is used to monitor the output of the voltage sag simulation device 4, including parameters such as voltage, current, and power. They usually include sensors, measurement circuits, and data acquisition systems to monitor and record the performance of the voltage sag simulation device 4 in real time. The temperature monitoring module 45 monitors the internal temperature of the PLC body 1 after rapid aging through a probe. First, the output current of the power switch 52 is increased through the current limiter 53, and then a heating air flow is supplied to the inside of the PLC body 1 through the heating component 51. The PLC body 1 will age rapidly in an environment of heating air flow and excessive current. The current and voltage of the aged PLC body 1 can be monitored through the current and voltage monitoring device 2 to complete a function test of the PLC.

[0047] As described above, the voltage sag simulation controller 42 generates a voltage drop situation and sets the parameters of the voltage drop. After the parameters change, the voltage sag simulation controller 42 controls the power supply module 41 to reduce the output voltage. At the same time, the load module 43 will also be adjusted accordingly to simulate the change of the load in the system. This interaction can make the output of the voltage sag simulation device 4 conform to the voltage drop situation in the actual power system. On the premise that the PLC body 1 is in rapid aging, then let the PLC body 1 be in this voltage drop situation. At this time, the current and voltage of the PLC body 1 are monitored again through the current and voltage monitoring device 2, and the function test of the PLC is completed again to check whether the produced PLC can be used normally under these two factors.

[0048] After the PLC main body 1 is rapidly aged in the aging device 5, the temperature inside the PLC main body 1 will rise and it takes a certain amount of time to dissipate heat. However, when it is necessary to perform a function test on the rapidly aged PLC main body 1 in a short period of time, the temperature monitoring module 45 can be used to detect the temperature inside the PLC main body 1. If the temperature inside the PLC main body 1 is 2 degrees higher than the normal temperature, the output voltage of the voltage sag simulation device 4 can be slightly increased to compensate for the increase in resistance in the circuit, and fine-tuning can be carried out within the range of 1% to 3%. When the temperature deviation inside the PLC main body 1 increases to 5 degrees, the increase in resistance in the circuit may be more significant. Therefore, it is necessary to adjust the voltage more significantly, and the output voltage of the voltage sag simulation device 4 can be increased by 3% to 5%. When the temperature deviation inside the PLC main body 1 increases to 8 degrees, the increase in resistance in the circuit will be more obvious. Therefore, it is necessary to adjust the voltage more significantly, and the output voltage of the voltage sag simulation device 4 can be increased by 5% to 8%. By controlling the magnitude of the output voltage to adapt to the internal temperature of the PLC main body 1 after rapid aging, the function test of the PLC main body 1 under the condition of voltage drop after aging can be carried out more quickly.

[0049] By setting up the PLC function test equipment, the electric drive lifting plate 6 is lifted and lowered, so that the lifting plate 6 can drive the PLC main body 1 arranged below the lifting plate 6 to be lifted and lowered. The lifting plate 6 drives the PLC main body 1 to descend. During the descending process of the PLC main body 1, it will collide with the blocking plate 7. In this case, the current and voltage monitoring device 2 monitors the current and voltage of the PLC main body 1, simulating whether the internal electronic components of the PLC main body 1 will become loose and thus affect the normal use when the PLC main body 1 is installed inside an electronic device and the electronic device drops or is bumped, etc. The current and voltage test data of the PLC main body 1 after multiple collisions can be collected, and the function test of the PLC is completed under the conditions of rapid aging, voltage drop and external bumping after falling. When multiple factors occur simultaneously, the function test of the PLC is more comprehensive.

[0050] As Figure 3-4 shown, the impact test device 3 includes a base plate 31, two guide rail plates 32 fixedly arranged on the upper side of the base plate 31, and four guide posts 33. The impact test device 3 further includes a top plate 34 fixedly installed on the upper side of the two guide rail plates 32, and a cross vertical groove 35 is opened inside the guide rail plate 32.

[0051] Specifically, the four guide posts 33 penetrate through the lifting plate 6, and the lifting plate 6 is lifted and lowered guided by the four guide posts 33. The top plate 34 is arranged at the upper end of the lifting plate 6 to prevent the lifting plate 6 from rising and disengaging from the four guide posts 33, ensuring the stability of the lifting and lowering of the lifting plate 6 and preventing the lifting plate 6 from tilting during the lifting process.

[0052] As Figure 5As shown in the figure, a sliding plate 351 is movably installed inside the cross vertical groove 35. On one side of the sliding plate 351 facing the central position of the impact testing device 3, a plurality of U-shaped bars 352 are fixedly installed. The blocking plate 7 is embedded inside the U-shaped bars 352, and the length of the blocking plate 7 is longer than that of the U-shaped bars 352.

[0053] Specifically, the sliding plate 351 can move inside the cross vertical groove 35. When the sliding plate 351 moves to the extreme position outside the impact testing device 3, both the sliding plate 351 and the U-shaped bars 352 are inside the cross vertical groove 35. When the sliding plate 351 moves to the extreme position towards the central position of the impact testing device 3, the U-shaped bars 352 are exposed outside the cross vertical groove 35. The blocking plate 7 is installed inside the U-shaped bars 352 by embedding. The blocking plate 7 will block the sliding plate 351 and make the sliding plate 351 unable to move. The blocking plate 7 can be separated from the U-shaped bars 352 at any time to change whether the PLC body 1 first contacts and collides with the lower left blocking plate 7 or the lower right blocking plate 7 first. When the PLC body 1 continuously contacts and collides with the multiple lower right blocking plates 7 during the descending process, it is tested. When the PLC body 1 continuously contacts and collides with the multiple lower left blocking plates 7 during the descending process, it is tested. Or when the PLC body 1 contacts and collides with the lower left blocking plate 7 at one height and the lower right blocking plate 7 at another height during the descending process, it is tested, improving the test data when the PLC body 1 is subjected to multiple impacts and making the test of the PLC body 1 more comprehensive.

[0054] As Figure 6 shown in the figure, a plurality of lifting components 36 are installed inside the top plate 34. The lifting components 36 include a fixedly installed first motor 361 and a first winding wheel 362 fixedly installed on the output shaft of the first motor 361. A metal wire 363 is wound around the outside of the first winding wheel 362, and one end of the multiple metal wires 363 is fixedly connected to the upper side of the lifting plate 6.

[0055] Specifically, when the lifting plate 6 is at the highest initial position and needs to descend, the first motor 361 is electrically driven to drive the metal wire 363 to rotate and then unwind the metal wire 363. The four groups of metal wires 363 are unwound simultaneously, and under the condition of the self-weight of the lifting plate 6, the lifting plate 6 descends, driving the PLC body 1 below the lifting plate 6 to descend. In this way, when the lifting plate 6 descends, the metal wire 363 is straightened, avoiding the inconsistent descending speed of the lifting plate 6 each time. Accurate data can avoid accidents.

[0056] As Figure 7As shown in the figure, an electrically driven component 8 is movably installed inside the lifting plate 6, and a clamping component 9 is arranged on the upper side of the PLC body 1. The clamping component 9 includes a strip-shaped outer shell 92 and an adjusting column 91 movably arranged inside the strip-shaped outer shell 92. Two moving clamping plates 93 are movably installed on the lower side of the strip-shaped outer shell 92.

[0057] As Figure 8 As shown in the figure, a forward lead screw 911 is fixedly installed at one end of the adjusting column 91, and a reverse lead screw 912 is fixedly installed at the other end of the adjusting column 91. The upper part of one group of moving clamping plates 93 is helically connected to the forward lead screw 911, and the upper part of the other group of moving clamping plates 93 is helically connected to the reverse lead screw 912. An infrared sensor 931 is fixedly installed on the lower side of the moving clamping plate 93.

[0058] Specifically, the self-weight of the PLC body 1 is greater than the self-weight of the lifting plate 6. By turning the adjusting column 91, the forward lead screw 911 and the reverse lead screw 912 rotate simultaneously. The forward lead screw 911 and the reverse lead screw 912 are respectively helically connected to the two groups of moving clamping plates 93. The simultaneous rotation of the forward lead screw 911 and the reverse lead screw 912 makes the two groups of moving clamping plates 93 move towards each other, so that the PLC body 1 is located between the two groups of moving clamping plates 93. The two mutually approaching moving clamping plates 93 will clamp the PLC body 1, making the PLC body 1 located on the lower side of the lifting plate 6. The descent of the lifting plate 6 drives the PLC body 1 to descend. The PLC body 1 contacts and collides with a group of blocking plates 7. The current and voltage monitoring device 2 monitors the current and voltage output by the PLC body 1 at this time to test whether the internal electronic components of the PLC body 1 are loose. If the current and voltage change, it means that the internal electronic components of the PLC body 1 are loose. If there is no change, the internal electronic components of the PLC body 1 are not loose. The PLC body 1 is collided multiple times during the descent process. At this time, the current and voltage data of the PLC body 1 are tested to simulate whether the PLC body 1 can be used normally after being impacted in the actual situation.

[0059] Embodiment 2

[0060] As Figure 7 As shown in the figure, compared with Embodiment 1, another implementation manner of the present invention is that a first winding rope 81 and a second winding rope 82 are wound on both sides of the electrically driven component 8, and one ends of the first winding rope 81 and the second winding rope 82 are fixedly connected to the upper side of the strip-shaped outer shell 92.

[0061] Specifically, when the clamping assembly 9 and the PLC body 1 connected to the first winding rope 81 and the second winding rope 82 are lifted into the air, they are in a horizontal state. At this time, the first winding rope 81 and the second winding rope 82 are in a vertical state. When the PLC body 1 contacts and collides with the blocking plate 7, the first winding rope 81 or the second winding rope 82 on the same side as the blocking plate 7 will deform. When the PLC body 1 does not contact and collide with the blocking plate 7, the first winding rope 81 or the second winding rope 82 is in a taut state, which can ensure the stability of the descent of the PLC body 1.

[0062] As Figure 9 shown, a component groove 61, a limiting strip groove 62, and an arc groove 63 are formed inside the lifting plate 6. The component groove 61, the limiting strip groove 62, and the arc groove 63 are connected and communicated. The first winding rope 81 and the second winding rope 82 are arranged inside the limiting strip groove 62 and the arc groove 63.

[0063] Specifically, when the PLC body 1 contacts and collides with the blocking plate 7, the first winding rope 81 or the second winding rope 82 at the lower end of the lifting plate 6 will deform, and the first winding rope 81 or the second winding rope 82 inside the limiting strip groove 62 and the arc groove 63 will not change, avoiding this change from affecting the winding conditions of the third winding wheel 88 and the second winding wheel 86.

[0064] As Figure 10 shown, the electric drive assembly 8 includes a second motor 83 fixedly installed inside the component groove 61. The lower side of the second motor 83 is connected with a first gear 84 through an output shaft. A second gear 85 and a third gear 87 are arranged outside the first gear 84. The lower side of the second gear 85 is fixedly connected with a second winding wheel 86, and the lower side of the third gear 87 is fixedly connected with a third winding wheel 88. The first winding rope 81 is wound outside the third winding wheel 88, and the second winding rope 82 is wound outside the second winding wheel 86. The second winding wheel 86 and the third winding wheel 88 are movably installed inside the component groove 61 through shafts. When the first gear 84 rotates in the reverse direction at the initial position, it drives the third gear 87 to rotate and does not drive the second gear 85 to rotate.

[0065] Specifically, when the PLC body 1 collides with the blocking plate 7, the PLC body 1 changes from a horizontal state to an inclined state. Suppose the PLC body 1 makes a small rotation in one direction with the connection point of the first winding rope 81 and the clamping assembly 9 as the center of the circle. At this time, the second winding rope 82 will deform. When the PLC body 1 separates from this group of blocking plates 7, the PLC body 1 still retains the rotational force in this direction. Therefore, when it collides with the next group of blocking plates 7, the PLC body 1 has not yet returned to the horizontal state. When the non-horizontal PLC body 1 comes into contact with another group of blocking plates 7, it may drive the PLC body 1 to flip or rotate significantly. Since the PLC body 1 needs to be connected to the wires or probes of the voltage dip simulation device 4 and the current and voltage monitoring device 2 at this time, a significant rotation or flip may cause the wires or probes to loosen, resulting in a poor effect on the functional test of the PLC. Therefore, in this device, when the PLC body 1 descends and comes into contact with the uppermost blocking plate 7, at this distance, the infrared sensor 931 electrically drives the second motor 83 to work. When the PLC body 1 comes into contact with the blocking plate 7 on its lower left side, the lower end of the second winding rope 82 deforms, and the PLC body 1 rotates with the connection point of the first winding rope 81 and the clamping assembly 9 as the center of the circle. The second motor 83 drives the first gear 84 to rotate forward from the initial position. At this time, the first gear 84 drives the second gear 85 to rotate, but does not drive the third gear 87 to rotate. The rotation of the second gear 85 drives the second winding wheel 86 to rotate to wind the second winding rope 82. At this time, the lower end of the second winding rope 82 changes from a deformed state to a straightened state, offsetting the residual rotational force of the PLC body 1. As the PLC body 1 separates from this group of blocking plates 7, the second motor 83 drives the first gear 84 to rotate in the reverse direction. The rotation of the second gear 85 drives the second winding wheel 86 to rotate to unwind the second winding rope 82. Under the self-weight on one side of the PLC body 1, the PLC body 1 quickly changes from an inclined state to a horizontal state and completes the contact collision with the next group of blocking plates 7 in a horizontal state. By increasing the interval between different groups of blocking plates 7, enough time is given for the blocking plates 7 to change from an inclined state to a horizontal state during the descent. However, such a setting will greatly increase the materials and height of the entire device, making it difficult to transport and place the device, and also costing more. By repeatedly making the PLC body 1 in a horizontal state come into contact with the blocking plates 7, the current and voltage data of the PLC body 1 when it is bumped inside the device are monitored. Moreover, this monitoring is carried out under the condition of PLC body 1 aging and voltage drop. Through the functional test of the PLC body 1 under extreme conditions, it is confirmed whether the PLC body 1 is qualified. The PLC qualification under this kind of test is more authentic.

[0066] A method for testing the function of a PLC, which adopts the above-mentioned PLC function testing device, and includes the following steps:

[0067] Step 1: Preparation: Prepare the PLC body 1, hold the PLC body 1 by the clamping component 9 so that the PLC body 1 is directly below the lifting plate 6;

[0068] Step 2: Aging test: Electrically connect the aging device 5 to the PLC body 1, and the PLC body 1 is accelerated in aging. After aging, the PLC body 1 works normally. Electrically connect the current and voltage monitoring device 2 to the PLC body 1 at this time to monitor whether the current and voltage of the PLC body 1 change, and observe whether the aged PLC body 1 is working stably. By accelerating the aging of the PLC body 1, it is equivalent to using it for a long time, so as to observe whether the PLC body 1 works stably after being used for a long time, making the test effect closer to the PLC body 1 in the actual situation;

[0069] Step 3: Voltage drop test after aging: Disconnect the electrical connection between the aging device 5 and the PLC body 1, and electrically connect the current and voltage monitoring device 2 and the voltage dip simulation device 4 to the PLC body 1 at the same time. The voltage dip simulation device 4 is used to simulate the voltage drop situation in the power system. The current and voltage monitoring device 2 tests the output current and voltage of the PLC body 1 under the condition of voltage drop, and observes whether the PLC body 1 is working stably at this time. By testing the PLC body 1 under the simultaneous presence of two factors, voltage drop and aging, the function of the PLC body 1 can be understood more comprehensively;

[0070] Step 4: Impact test after aging; In the above steps, the PLC body 1 has been aged. Drive the lifting of the PLC body 1 by the lifting of the lifting plate 6 in the impact test device 3, so that the PLC body 1 contacts and collides with the blocking plate 7 to test the output of voltage and current when the aged PLC body 1 is collided. This output situation is monitored by the current and voltage monitoring device 2. By testing the PLC body 1 under the simultaneous presence of two factors, impact and aging, the function of the PLC body 1 can be understood more comprehensively;

[0071] Step 5: Voltage drop and impact test after aging: Electrically connect the aged PLC body 1 to the current and voltage monitoring device 2 and the voltage dip simulation device 4 at the same time, and at this time, the impact test device 3 conducts an impact test. During the impact test, the current and voltage are monitored by the current and voltage monitoring device 2. By testing the PLC body 1 under the simultaneous presence of three factors, impact, aging, and voltage drop, the function of the PLC body 1 can be further comprehensively understood.

[0072] When the second step is carried out, the heating component 51 in the aging device 5 outputs an air flow of 40°C - 60°C into the PLC main body 1, and the power switch 52 and the current limiter 53 increase the current output to the PLC main body 1 by 10% - 50%;

[0073] The voltage sag simulation device 4 drops the voltage to 80% - 90% of the rated voltage of the PLC main body 1.

[0074] Working principle: First, the current limiter 53 increases the output current of the power switch 52, and then the heating component 51 supplies heated air flow to the inside of the PLC main body 1. In the environment of heated air flow and excessive current, the PLC main body 1 will age rapidly. The current and voltage of the PLC main body 1 after aging can be monitored by the current and voltage monitoring device 2 to complete a function test of the PLC. As above, the voltage sag simulation controller 42 generates a voltage drop situation and sets the parameters of the voltage drop. After the parameters change, the voltage sag simulation controller 42 controls the power module 41 to reduce the output voltage. At the same time, the load module 43 will also adjust accordingly to simulate the change of the load in the system. This interaction can make the voltage sag simulation device 4 output in line with the voltage drop situation in the actual power system. On the premise that the PLC main body 1 is aging rapidly, then let the PLC main body 1 be in this voltage drop situation. At this time, the current and voltage of the PLC main body 1 are monitored again by the current and voltage monitoring device 2 to complete the function test of the PLC again to see whether the produced PLC can be used normally under these two factors. When the PLC main body 1 contacts and collides with the obstacle plate 7 at the top, at this distance, the infrared sensor 931 electrically drives the second motor 83 to work. When the PLC main body 1 contacts and collides with the obstacle plate 7 on its lower left side, the lower end of the second winding rope 82 deforms, and the PLC main body 1 rotates around the connection point of the first winding rope 81 and the clamping component 9. The second motor 83 drives the first gear 84 to rotate forward. At this time, the first gear 84 drives the second gear 85 to rotate, but does not drive the third gear 87 to rotate. The rotation of the second gear 85 drives the second winding wheel 86 to rotate to wind the second winding rope 82. At this time, the lower end of the second winding rope 82 changes from a deformed state to a straightened state, offsetting the remaining rotational force of the PLC main body 1. As the PLC main body 1 disengages from this group of obstacle plates 7, the second motor 83 drives the first gear 84 to rotate in the reverse direction. The rotation of the second gear 85 drives the second winding wheel 86 to rotate to unwind the second winding rope 82. Under the self-weight on one side of the PLC main body 1, the PLC main body 1 quickly changes from an inclined state to a horizontal state and completes the contact collision with the next group of obstacle plates 7 in a horizontal state.

[0075] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A PLC function test device, comprising an impact test device (3) and a current and voltage monitoring device (2) installed on one side of the impact test device (3), characterized in that: A voltage drop simulation device (4) and an aging device (5) are arranged outside the impact test device (3); the impact test device (3) is used to place the PLC body (1); the aging device (5) comprises a heating component (51), a power switch (52) and a current limiter (53); and the aging device (5) is used to age the PLC body (1); The voltage drop simulation device (4) comprises a power module (41), a voltage drop simulation controller (42), a load module (43), a measurement monitoring module (44) and a temperature monitoring module (45); the current and voltage monitoring device (2) is used to monitor the current and voltage of the PLC body (1); and the voltage drop simulation device (4) is used to simulate a voltage drop in the power system; A lifting plate (6) is movably mounted on the upper part of the impact test device (3), the PLC body (1) is movably mounted on the lower side of the lifting plate (6), a plurality of blocking plates (7) are movably mounted on the inner walls of both sides of the impact test device (3), and the voltage drop simulation device (4), the current and voltage monitoring device (2) and the aging device (5) are electrically connected to the PLC body (1); The impact testing device (3) comprises a base plate (31), two guide rail plates (32) fixedly arranged on the upper side of the base plate (31), and four guide columns (33); the impact testing device (3) further comprises a top plate (34) fixedly installed on the upper sides of the two guide rail plates (32); a cross vertical groove (35) is provided inside the guide rail plate (32); A sliding plate (351) is movably installed inside the cross vertical groove (35), and a plurality of U-shaped bars (352) are fixedly installed on one side of the sliding plate (351) facing the center position of the impact testing device (3), and the obstruction plate (7) is embedded inside the U-shaped bar (352), and the length of the obstruction plate (7) is longer than the length of the U-shaped bar (352).

2. A PLC function test device according to claim 1, characterized in that: A plurality of lifting components (36) are installed inside the top plate (34), and the lifting components (36) include a first motor (361) fixedly installed and a first winding wheel (362) fixedly installed on the output shaft of the first motor (361), and a metal wire (363) is installed around the outer side of the first winding wheel (362), and one end of the plurality of metal wires (363) is fixedly connected to the upper side of the lifting plate (6).

3. A PLC function test device according to claim 1, characterized in that: An electric drive component (8) is movably installed inside the lifting plate (6); a clamping component (9) is arranged on the upper side of the PLC body (1); the clamping component (9) comprises a strip-shaped outer shell (92) and an adjustment column (91) movably arranged inside the strip-shaped outer shell (92); and two movable clamping plates (93) are movably installed on the lower side of the strip-shaped outer shell (92).

4. A PLC function test device according to claim 3, characterized in that: The electric drive component (8) is wound up with a first winding rope (81) and a second winding rope (82) on both sides, one end of the first winding rope (81) and the second winding rope (82) are fixedly connected to the upper side of the strip shell (92), one end of the adjustment column (91) is fixedly installed with a forward spiral screw (911), and the other end of the adjustment column (91) is fixedly installed with a reverse spiral screw (912), the upper part of one group of the movable clamping plates (93) is spirally connected to the forward spiral screw (911), and the upper part of the other group of the movable clamping plates (93) is spirally connected to the reverse spiral screw (912), and the lower side of the movable clamping plate (93) is fixedly installed with an infrared sensor (931).

5. A PLC function test device according to claim 4, characterized in that: The lifting plate (6) is provided with a component groove (61), a limiting groove (62) and an arc groove (63) inside, the component groove (61), the limiting groove (62) and the arc groove (63) are connected, and the first winding rope (81) and the second winding rope (82) are arranged inside the limiting groove (62) and the arc groove (63).

6. A PLC function test device according to claim 5, characterized in that: The electrical drive component (8) comprises a second motor (83) fixedly mounted inside the component groove (61); the lower side of the second motor (83) is connected to a first gear (84) via an output shaft; a second gear (85) and a third gear (87) are arranged on the outer side of the first gear (84); a second winding wheel (86) is fixedly connected to the lower side of the second gear (85); a third winding wheel (88) is fixedly connected to the lower side of the third gear (87); the first winding rope (81) is wound around the outer side of the third winding wheel (88); the second winding rope (82) is wound around the outer side of the second winding wheel (86); the second winding wheel (86) and the third winding wheel (88) are movably mounted inside the component groove (61) via shafts.

7. A method for testing PLC functions, the method using a PLC function testing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Preparation: Prepare the PLC body (1), clamp the PLC body (1) with the clamping assembly (9), and place the PLC body (1) directly below the lifting plate (6); Step 2: Aging test: The aging device (5) is electrically connected to the PLC body (1), and the PLC body (1) is aged at an accelerated rate. The PLC body (1) works normally after aging. The current and voltage monitoring device (2) is electrically connected to the PLC body (1) at this time to monitor whether the current and voltage of the PLC body (1) change, and observe whether the PLC body (1) works stably after aging. Step 3: Voltage drop test after aging: The aging device (5) is no longer electrically connected to the PLC body (1), and the current and voltage monitoring device (2) and the voltage drop simulation device (4) are electrically connected to the PLC body (1) at the same time. The voltage drop simulation device (4) is used to simulate the voltage drop in the power system. The current and voltage monitoring device (2) tests the output current and voltage of the PLC body (1) under the voltage drop condition to observe whether the PLC body (1) is working stably at this time. Step 4: impact test after aging; in step 2, the PLC body (1) has been aged, and the lifting plate (6) in the impact test device (3) is lifted to drive the PLC body (1) to lift and lower, so that the PLC body (1) contacts and collides with the blocking plate (7) to test the output of voltage and current when the PLC body (1) after aging is hit. This output is monitored by the current and voltage monitoring device (2); Step 5: Voltage drop and impact test after aging: The aged PLC body (1) is electrically connected to the current and voltage monitoring device (2) and the voltage drop simulation device (4) at the same time, and the impact test device (3) performs an impact test at this time. During the impact test, the current and voltage are monitored by the current and voltage monitoring device (2).

8. A method for testing a PLC function according to claim 7, characterized in that: When the second step is performed, the heating component (51) in the aging device (5) outputs an air flow of 40°C-60°C to the inside of the PLC body (1), and the power switch (52) and the current limiter (53) increase the current output to the PLC body (1) by 10%-50%; the voltage drop simulation device (4) reduces the voltage to 80%-90% of the rated voltage of the PLC body (1).

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