Analog automobile transportation vibration test bench special for electric energy meter

Abstract

The application discloses a special analog automobile transportation vibration test bench for electric energy meter, and relates to the technical field of product transportation analog test equipment, which has the advantages that the vibration and inertia of the automobile during the acceleration / deceleration and pit passing process can be simulated, and the technical scheme points are as follows: the test bench comprises a support, a swing mechanism, a mounting plate, a placing plate, a vibration mechanism, a clamping mechanism and a driving mechanism, the driving mechanism cooperates with the swing mechanism, the driving mechanism drives the mounting plate to swing along a first direction against gravity, the acceleration state is simulated, the driving mechanism is driven to be separated when the swing reaches a preset position, the mounting plate freely swings under the action of gravity, the deceleration state is simulated, and the vibration mechanism continuously drives the placing plate to vibrate at the same time, so that the product bears the vertical vibration and horizontal inertia force during the swing process, and the real mechanical environment when the vehicle passes through the pit is effectively reproduced.

Description

Technical Field

[0001] This invention relates to the field of product transportation simulation testing equipment, specifically a vibration test bench for simulating automobile transportation for electricity meters. Background Technology

[0002] An electricity meter is a precision measuring instrument used to measure electrical energy. It contains fragile components such as a metering chip, transformer, LCD display, and wiring terminals. To ensure that electricity meters are not damaged during transportation, they undergo simulated automotive transportation tests on a vibration table before leaving the factory to assess their ability to withstand transportation environments.

[0003] A vibration table, also known as a vibration test bench, is a testing device used to simulate the vibration and impact experienced by product packaging in environments such as road transportation, in order to assess its vibration resistance. Traditional vibration test benches, when simulating the process of automobile transportation, mostly only perform vertical vibrations to simulate the bumps during vehicle movement. However, when a vehicle is traveling on an actual road, encountering potholes not only causes vertical bouncing but also generates horizontal inertial forces due to changes in vehicle speed (acceleration or braking). Especially when the vehicle accelerates or decelerates over potholes, the stress acting on the electricity meter is a composite stress of vertical impact and horizontal inertial force. Traditional vertical vibration cannot reproduce this horizontal inertial load, leading to distortions in the assessment of the electricity meter's terminal pull-out resistance and the reliability of solder joints in large internal components (such as transformers and relays) under composite stress. It fails to realistically simulate the complete mechanical environment of automobile transportation.

[0004] Therefore, the applicant has developed a new technical solution in the actual production process to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a dedicated vibration test bench for simulating automobile transportation, which has the advantage of simulating the vibration and inertia of a car accelerating / decelerating over potholes during driving.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention provides a dedicated vibration test bench for simulating automobile transportation for electricity meters, comprising:

[0008] The support frame is installed on the base surface;

[0009] A swing mechanism is mounted on the bracket;

[0010] The mounting plate is connected to the swing mechanism and can swing on the bracket via the swing mechanism;

[0011] A placement plate, mounted on the mounting plate via a vibration mechanism, is used to support the product; the vibration mechanism is used to drive the placement plate to vibrate.

[0012] A clamping mechanism, disposed on the placement plate, is used to clamp the product;

[0013] A drive mechanism, mounted on the bracket, is used to cooperate with the swing mechanism to drive the mounting plate to swing against gravity along a first direction to simulate the acceleration state of a vehicle.

[0014] When the mounting plate swings to a preset position, the drive mechanism disengages from the swing mechanism, and the mounting plate swings freely back along a second direction opposite to the first direction under the action of gravity to simulate the vehicle deceleration state.

[0015] The vibration mechanism drives the placement plate to vibrate during the swinging of the mounting plate.

[0016] By adopting the above technical solution, this device uses a drive mechanism to push the mounting plate to swing in the first direction, simulating the backward inertial force on the cargo when the vehicle accelerates; when the drive mechanism disengages, the mounting plate swings freely in the second direction under the action of gravity, simulating the forward inertial force on the cargo when the vehicle decelerates; at the same time, the vibration mechanism always generates vertical vibration, so that the product bears the combined action of vertical vibration and horizontal inertial force during the swinging process, thereby realistically reproducing the mechanical environment when the vehicle accelerates over a pothole and decelerates over a pothole, effectively testing the impact resistance and solder joint reliability of the internal components of the electricity meter.

[0017] Preferably, the swing mechanism includes a swing frame, one end of which is rotatably connected to the top of the support, and the other end of which is provided with an arc-shaped plate, and the mounting plate is disposed on the arc-shaped plate.

[0018] Preferably, the arc-shaped plate is circular in shape, and its center is located on the rotation axis of the swing frame.

[0019] Preferably, the drive mechanism includes:

[0020] A fixing plate is mounted on the bracket;

[0021] The cylinder is mounted on the fixed plate;

[0022] A movable plate is disposed at the end of the piston rod of the cylinder;

[0023] The drive wheel is rotatably connected to the movable plate;

[0024] An electric motor, mounted on the movable plate, is used to drive the drive wheel to rotate;

[0025] The cylinder drives the moving plate to rise and fall, so that the drive wheel contacts or disengages from the arc-shaped plate of the swing mechanism.

[0026] Preferably, the drive wheel is provided with an elastic layer for contacting the arc-shaped plate.

[0027] Preferably, the system further includes a guiding mechanism disposed between the fixed plate and the movable plate, which guides the vertical movement of the movable plate.

[0028] Preferably, the vibration mechanism includes a vibration motor and an elastic element, the vibration motor is mounted on the placement plate, and the placement plate is connected to the mounting plate through the elastic element.

[0029] Preferably, the device further includes a sensor mounted on the bracket for detecting the swing position of the swing mechanism. The sensor is electrically connected to the cylinder to control the timing of the cylinder's action.

[0030] Preferably, the bracket is triangular in shape, and its bottom is fixedly connected to the base surface.

[0031] Preferably, the sensor is a proximity switch, and the sensor is electrically connected to the cylinder; when the sensor detects the arc-shaped plate, the cylinder drives the moving plate to descend, causing the drive wheel to separate from the arc-shaped plate; when the sensor does not detect the arc-shaped plate within a preset time, the cylinder drives the moving plate to rise, causing the drive wheel to contact the arc-shaped plate.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. Realistic simulation of composite stress: The horizontal inertial force generated by the swing mechanism is superimposed with the vertical vibration, which can realistically reproduce the composite mechanical environment that the energy meter is subjected to when the vehicle accelerates and decelerates over the pothole, effectively assessing the impact resistance and connection reliability of the internal components of the product.

[0034] 2. Simple structure and low cost: It uses gravity to naturally decelerate to simulate the deceleration process. The drive mechanism only does work during the acceleration phase, eliminating the need for complex multi-axis servo control, which reduces equipment cost and energy consumption.

[0035] 3. Ingenious control logic: The swing position is detected by a proximity switch, and the lifting and lowering of the drive wheel is controlled based on "signal / no signal" to automatically maintain the swing energy and realize unattended continuous testing.

[0036] 4. Smooth and reliable drive: The drive wheel has an elastic layer and is equipped with a guiding mechanism to ensure smooth contact and uniform thrust, thus extending the service life of the equipment.

[0037] 5. Unique follow-up vibration design for more realistic simulation: The vibration mechanism moves together with the swing mechanism, so that the vibration direction remains consistent with the product at all times. When the product swings with the swing mechanism, although the vibration direction changes continuously in absolute space, it is always perpendicular to the plane of the placement plate relative to the product itself. This realistically reproduces the stress state of the product as it is bumped by the carriage during transportation. Traditional fixed-direction vibration tables cannot simulate this follow-up effect, which can easily cause the product to bear directional stress that does not match reality during testing, resulting in distorted assessment. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0040] Figure 2 This is a schematic diagram of the curved plate in its initial position without swinging.

[0041] Figure 3 This is a schematic diagram illustrating the structure of the support in this embodiment;

[0042] Figure 4 This is a schematic diagram illustrating the structure of the mounting plate in this embodiment;

[0043] Figure 5 This is a schematic diagram illustrating the structure of the movable plate in this embodiment;

[0044] Figure 6 This is a schematic diagram showing the drive wheel disengaging from the curved plate.

[0045] Explanation of reference numerals in the attached figures:

[0046] In the diagram: 1. Support frame; 11. Swing frame; 111. Rotating shaft; 112. Arc plate; 113. Mounting plate; 114. Placement plate; 1141. Vibration motor; 1142. Elastic element; 1143. Clamping mechanism; 12. Fixing plate; 121. Cylinder; 122. Moving plate; 1221. Groove; 123. Drive wheel; 1231. Elastic layer; 124. Motor; 125. Column; 13. Sensor; 14. Base. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] A vibration test bench specifically designed for simulating automobile transportation, such as... Figures 1 to 3 As shown, the system includes a bracket 1, a swing mechanism, a mounting plate 113, a placement plate 114, a vibration mechanism, a clamping mechanism 1143, and a drive mechanism. The bracket 1 is triangular in shape, with a base 14 at its bottom. The base 14 is fixedly connected to the foundation surface by bolts. The base 14 can be made of steel plate to increase the contact area and improve installation stability. The swing mechanism is mounted on the bracket 1 and is used to drive the mounting plate 113 to swing. The swing mechanism includes a swing frame 11, one end of which is rotatably connected to the top side of the bracket 1 via a rotating shaft 111. The other end of the swing frame 11 is fixedly provided with an arc-shaped plate 112. The mounting plate... 113 is fixedly mounted on the arc plate 112. The arc plate 112 is arc-shaped, and its center is located on the rotation axis of the swing frame 11. The drive mechanism is mounted on the bracket 1 and is used to cooperate with the arc plate 112 of the swing mechanism to drive the mounting plate 113 to swing in the first direction against gravity to simulate the acceleration state of the vehicle. Since the center of the arc plate 112 coincides with the rotation axis of the swing frame 11, when the drive wheel 123 of the drive mechanism pushes the arc plate 112, the thrust direction is always perpendicular to the radius direction of the contact point of the arc plate 112, thereby ensuring that the thrust can be efficiently converted into swing torque and making the swing process more stable.

[0049] like Figure 2 and Figure 4 As shown, the placement plate 114 is mounted on the mounting plate 113 via a vibration mechanism to support the energy meter product to be tested. The vibration mechanism includes a vibration motor 1141 and an elastic element 1142. The vibration motor 1141 is mounted on the placement plate 114, and the placement plate 114 is connected to the mounting plate 113 via the elastic element 1142. The elastic element 1142 can be a spring or a rubber pad. When the vibration motor 1141 works, the generated excitation force acts directly on the placement plate 114, causing the placement plate 114 to vibrate in the vertical direction. At the same time, the elastic element 1142 isolates the transmission of vibration to the mounting plate 113, ensuring that the swing mechanism is not disturbed, thereby realistically simulating the road bumps during car driving. The clamping mechanism 1143 is set on the placement plate 114 to clamp the product and prevent it from shifting during vibration and swing.

[0050] The structure of the clamping mechanism 1143 can be a fixed component in a simulated automobile transportation vibration test bench with application number CN201720740741.2, which will not be described in detail here.

[0051] like Figure 2 and Figure 5 As shown, the drive mechanism includes a fixed plate 12, a cylinder 121, a movable plate 122, a drive wheel 123, and a motor 124. The fixed plate 12 is fixed to one side of the bracket 1. The cylinder 121 is mounted on the fixed plate 12, with its piston rod extending vertically upward. The movable plate 122 is fixedly connected to the end of the piston rod of the cylinder 121. The drive wheel 123 is rotatably connected to the movable plate 122 through a U-shaped support frame. The motor 124 is mounted on the movable plate 122, and its output shaft is connected to the drive wheel 123 to drive the drive wheel 123 to rotate. The outer circumferential surface of the drive wheel 123 is provided with an elastic layer 1231, such as a rubber layer, for elastic contact with the bottom surface of the arc plate 112 to buffer impact and increase friction. The cylinder 121 drives the movable plate 122 to rise and fall, thereby driving the drive wheel 123 to rise and fall, so that the drive wheel 123 contacts or disengages from the arc plate 112.

[0052] like Figure 5 As shown, in order to ensure the stability of the movable plate 122 when it is raised and lowered, a guide mechanism is provided between the fixed plate 12 and the movable plate 122. The guide mechanism includes at least two vertically arranged columns 125. The lower end of the columns 125 is fixed to the fixed plate 12. The movable plate 122 has grooves 1221 that correspond one-to-one with the columns 125. The top of the column 125 passes through the groove 1221 and slides in cooperation with the inner wall of the groove 1221. The cooperation between the column 125 and the groove 1221 constitutes a specific implementation of the guide mechanism. When the cylinder 121 pushes the movable plate 122 to rise and fall, the cooperation between the column 125 and the groove 1221 restricts the radial sway and rotation of the movable plate 122, ensuring that the drive wheel 123 is always aligned with the bottom surface of the arc plate 112.

[0053] like Figure 1 As shown, a sensor 13 is also provided on the bracket 1 to detect the swing position of the swing mechanism. The sensor 13 is preferably a proximity switch, which is fixed on the bracket 1 and located on the swing path of the arc plate 112. When the arc plate 112 swings with the swing frame 11 to the position of the sensor 13, the sensor 13 generates a detection signal. The sensor 13 is electrically connected to the cylinder 121 and directly controls the timing of the cylinder 121's action.

[0054] The function of each component is further explained below in conjunction with the working process:

[0055] In the initial state, such as Figure 2As shown, cylinder 121 is in the extended state, moving plate 122 is in the raised position, drive wheel 123 is in contact with arc plate 112, and motor 124 drives drive wheel 123 to rotate at a certain speed. Due to the friction between drive wheel 123 and arc plate 112, drive wheel 123 pushes arc plate 112, causing swing frame 11 to swing against gravity in the first direction (e.g., counterclockwise direction), that is, the product on mounting plate 113 and placement plate 114 swings to the upper right. This process simulates the state when the vehicle is accelerating: the product is subjected to backward inertial force as the vehicle accelerates, which manifests as tangential inertial force during swing. At the same time, the vibration mechanism continues to work, causing the product to be subjected to up and down vibration perpendicular to placement plate 114. The direction of vibration changes with the swing of placement plate 114, but remains consistent relative to the product, which truly simulates the force state of the product being bumped by the vehicle during transportation.

[0056] It should be emphasized that since the vibration mechanism is fixed together with the mounting plate 113, the placement plate 114 and the product, when the swing mechanism drives the product to swing, the vibration direction changes in absolute space, but it always remains in the up-down direction relative to the product itself. This means that the vertical vibration that the product experiences during the test is always consistent with the force direction it experiences when it is bumping along in the transport vehicle. No matter how the vehicle pitches up or down, the direction of the bumps experienced by the goods is always up-down relative to the goods themselves.

[0057] When the swing frame 11 swings to a certain angle (e.g., near the highest point), the arc plate 112 just reaches the detection position of the sensor 13. The sensor 13 sends a detection signal, which directly controls the cylinder 121 to retract, causing the moving plate 122 to descend. Figure 6 As shown, the drive wheel 123 disengages from the arc plate 112, at which point the motor 124 can stop rotating or continue to idle.

[0058] As the drive wheel 123 disengages, the swing mechanism loses its driving force and begins to swing freely in the second direction (i.e., clockwise) under the action of gravity. During this swing process, the swing mechanism first accelerates down to the lowest point, and then decelerates up to the other side. The product is always subjected to an inertial force opposite to the direction of motion. Specifically, since the product is fixed on the placement plate 114, it cannot fall vertically freely. Instead, it accelerates to the left along with the placement plate 114, mounting plate 113, arc plate 112, and swing frame 11 under the action of gravity. The product then gains a leftward acceleration, which is generated by the clamping force provided by the clamping mechanism 1143. In order to maintain its original stationary state, the product will exert a rightward reaction force on the clamping mechanism 1143. This force is the manifestation of inertial force, and its magnitude is equal to the product mass multiplied by the leftward acceleration. This rightward inertial force is exactly the inertial impact that simulates the forward (i.e., the direction of motion) of the cargo when the car decelerates. During this process, the vibration mechanism continues to work, so that the product is subjected to vertical vibration while simulating deceleration.

[0059] As the swing mechanism swings freely back, its swing amplitude gradually decreases. When it swings to the lowest point on the other side and then swings towards the sensor 13 again, the swing energy is no longer sufficient to make the arc plate 112 reach the position of the sensor 13 again. At this time, if the sensor 13 does not detect the arc plate 112 within a preset time, it directly controls the cylinder 121 to extend, causing the moving plate 122 to rise a certain distance, so that the drive wheel 123 contacts the arc plate 112 again. At the same time, the motor 124 is started to drive the drive wheel 123 to rotate, which pushes the swing mechanism to accelerate again and starts the next round of acceleration-deceleration cycle. This process is repeated, and the test bench can automatically and continuously simulate the process of the vehicle repeatedly accelerating and decelerating over the pothole.

[0060] Throughout the entire process, the vibration mechanism can operate continuously or intermittently, subjecting the product to vertical vibration, thus realistically reproducing the complex stress environment caused by uneven road surfaces and changes in vehicle speed during automobile transportation.

[0061] It should be noted that the specific definitions of the first direction and the second direction depend on the actual installation and initial settings. For example, if the first direction is clockwise, the second direction is counterclockwise, and vice versa. In this embodiment, the preset position can be adjusted as needed to change the length of the acceleration stroke by adjusting the installation position of the sensor 13. The preset time can be set according to the swing period and energy decay, for example, it can be set to 1.5 times the maximum swing period.

[0062] As can be seen from the above working process, the test bench of the present invention can accurately simulate the horizontal inertial force of a vehicle during acceleration and deceleration, and superimpose it with the vertical vibration, so that the electricity meter product is subjected to the same composite stress as the actual transportation during the test, thereby effectively assessing key performance such as the pull-out resistance of the wiring terminals and the reliability of the solder joints of internal components. At the same time, the automated energy compensation mechanism enables the equipment to run continuously for a long time without manual intervention, which greatly improves the testing efficiency.

[0063] It should be noted that the original design purpose of this invention is not to replace the triaxial vibration test specified in the national standard GB / T 2423, but to provide a composite stress simulation method that is closer to the real physical process for the specific transportation conditions of vehicles accelerating over potholes and decelerating over potholes. In practical applications, conventional vibration tests in three directions can be completed first according to the national standard, and then this test bench can be used to conduct enhanced simulation of the pothole-crossing condition. The two complement each other and jointly ensure the reliability of the electricity meter product in the transportation environment.

[0064] The vibration test specified in the national standard GB / T 2423 applies stress in three mutually perpendicular directions at different times. This cannot simulate the combined stress condition of vertical vibration and horizontal inertial force acting simultaneously when a vehicle accelerates and decelerates over a pothole. However, in actual transportation, damage to electricity meters often occurs under this combined stress condition. Therefore, this invention is designed to address this blind spot that the standard test cannot cover: through the coordinated work of the swing mechanism and the vibration mechanism, the product is subjected to both vertical vibration and horizontal inertial force during the test, and the vibration direction remains consistent with the vertical direction relative to the product as it swings, thus realistically reproducing the combined stress environment of the pothole-crossing condition.

[0065] Therefore, the test bench of the present invention is not a simple repetition of the standard test, but a necessary supplement. Together with the standard test, it constitutes a complete reliability assessment system, which significantly improves the reliability assurance level of electricity meter products in real transportation environments.

[0066] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A vibration test bench for simulating automobile transportation, specifically for electricity meters, characterized in that, include: The bracket (1) is set on the base surface; A swing mechanism is mounted on the bracket (1); Mounting plate (113) is connected to the swing mechanism and can swing on the bracket (1) via the swing mechanism; The placement plate (114) is mounted on the mounting plate (113) via a vibration mechanism to support the product. The vibration mechanism is used to drive the placement plate (114) to vibrate. A clamping mechanism (1143) is disposed on the placement plate (114) for clamping the product; A drive mechanism is provided on the bracket (1) for cooperating with the swing mechanism to drive the mounting plate (113) to swing in the first direction against gravity to simulate the vehicle acceleration state; When the mounting plate (113) swings to a preset position, the drive mechanism disengages from the swing mechanism, and the mounting plate (113) swings freely back along a second direction opposite to the first direction under the action of gravity to simulate the vehicle deceleration state; The vibration mechanism drives the placement plate (114) to vibrate during the swinging of the mounting plate (113); The swing mechanism includes a swing frame (11), one end of which is rotatably connected to the top of the support (1), and the other end of which is provided with an arc plate (112), and the mounting plate (113) is disposed on the arc plate (112); The drive mechanism includes: A fixing plate (12) is disposed on the bracket (1); A cylinder (121) is mounted on the fixed plate (12); A movable plate (122) is disposed at the end of the piston rod of the cylinder (121); The drive wheel (123) is rotatably connected to the movable plate (122); A motor (124) is mounted on the movable plate (122) and is used to drive the drive wheel (123) to rotate; The cylinder (121) drives the moving plate (122) to rise and fall, so that the drive wheel (123) contacts or disengages from the arc plate (112) of the swing mechanism; It also includes a sensor (13), which is mounted on the bracket (1) and is used to detect the swing position of the swing mechanism. The sensor (13) is electrically connected to the cylinder (121) to control the timing of the cylinder (121)'s action.

2. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 1, characterized in that, The arc plate (112) is arc-shaped, and its center is located on the rotation axis of the swing frame (11).

3. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 1, characterized in that, The drive wheel (123) is provided with an elastic layer (1231) for contacting the arc plate (112).

4. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 1, characterized in that, It also includes a guide mechanism, which is disposed between the fixed plate (12) and the movable plate (122) for guiding the vertical movement of the movable plate (122).

5. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 4, characterized in that, The vibration mechanism includes a vibration motor (1141) and an elastic element (1142). The vibration motor (1141) is mounted on the placement plate (114), and the placement plate (114) is connected to the mounting plate (113) through the elastic element (1142).

6. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 1, characterized in that, The bracket (1) is triangular in shape, and its bottom is fixedly connected to the base surface.

7. The vibration test bench for simulating automobile transportation for electricity meters as described in claim 6, characterized in that, The sensor (13) is a proximity switch and is electrically connected to the cylinder (121). When the sensor (13) detects the arc plate (112), the cylinder (121) drives the moving plate (122) to descend, causing the drive wheel (123) to separate from the arc plate (112). When the sensor (13) does not detect the arc plate (112) within a preset time, the cylinder (121) drives the moving plate (122) to rise, causing the drive wheel (123) to contact the arc plate (112).

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