A fall tester

Abstract

The utility model discloses a kind of drop testing machines, drop testing machine includes: pedestal, pulley assembly, driving assembly, electromagnetic chuck and current line, pulley assembly is set on pedestal, pulley assembly is respectively connected with the output end of driving assembly and electromagnetic chuck, driving assembly is used to drive electromagnetic chuck upward or downward movement by pulley assembly, current line is electrically connected with electromagnetic chuck, and electromagnetic chuck is used to magnetically attract battery to be measured.The setting of the pulley assembly of the utility model effectively reduces the resistance caused by friction in the driving process, so that the whole lifting process is more stable and smooth, and the application range and operating efficiency of the equipment are improved. The drop testing machine improves the drop test effect for large-size and heavy-duty batteries through innovative structure design, effectively realizes convenient operation, safety and reliability and test standardization, and has good popularization and application prospect.

Description

Technical Field

[0001] This utility model relates to the technical field of drop testing machines, and more particularly to a drop testing machine. Background Technology

[0002] With the rapid development of industries such as new energy vehicles and energy storage equipment, the application of large-capacity and large-size batteries is becoming increasingly widespread. Batteries inevitably suffer from mechanical stresses such as drops and impacts during actual transportation, storage, and use, thus placing higher demands on their mechanical safety performance. To assess the safety and structural integrity of batteries under extreme conditions such as drops, drop testing has become a crucial part of battery product quality inspection.

[0003] Currently, traditional battery drop test machines mostly use mechanical clamps or platforms to place the battery under test at a certain height and then release it, allowing it to fall freely to the ground or a designated platform. This method has several drawbacks: First, for large and heavy batteries, manual placement is difficult and prone to instability and positional shifts, affecting the accuracy of the test; second, the mechanical clamps may exert lateral or rotational forces on the battery at the moment of release, making it impossible to guarantee that the battery falls in a completely free-fall state, thus interfering with the scientific validity and consistency of the drop test; in addition, manual operation also presents risks such as high labor intensity and safety hazards, making it difficult to meet the needs of efficient and standardized testing.

[0004] To address these issues, some drop testing machines have attempted to incorporate automated lifting and release mechanisms, such as electric winches and pneumatic release devices. However, these still face challenges such as unstable movement, high frictional resistance, and limited release methods, making it difficult to simultaneously achieve ease of operation, safety, and standardized testing. Therefore, there is an urgent need for a new type of drop testing machine with a more rational structure and simpler operation, capable of adapting to automated and standardized drop testing of heavy-duty batteries. This would improve testing efficiency and result reliability, and promote the healthy development of the battery industry. Utility Model Content

[0005] To achieve the above objectives, the present invention provides a solution as follows: a drop test machine includes a base, a pulley assembly, a drive assembly, an electromagnetic chuck, and a current line. The pulley assembly is mounted on the base and is connected to the output end of the drive assembly and the electromagnetic chuck, respectively. The drive assembly is used to drive the electromagnetic chuck to move upward or downward through the pulley assembly. The current line is electrically connected to the electromagnetic chuck, and the electromagnetic chuck is used to magnetically attract the battery to be tested.

[0006] Optionally, the base includes a load-bearing column and a support, which are arranged at an angle; the pulley assembly includes a fixed pulley and a rope, the fixed pulley is mounted on the support, the rope is wound around the fixed pulley, and the rope is connected to the output end of the electromagnetic chuck and the drive assembly respectively.

[0007] Optionally, the current wire is wound along the extension direction of the rope.

[0008] Optionally, the pulley assembly also includes an auxiliary wheel, which is mounted on the bracket. The auxiliary wheel and the fixed pulley are located on opposite sides of the load-bearing column, and the rope is further wound around the auxiliary wheel and then connected to the output end of the drive assembly.

[0009] Optionally, the pulley assembly also includes a movable pulley, which is connected to an electromagnetic chuck, and the rope is wound around the movable pulley and then connected to the bracket.

[0010] Optionally, the drive assembly includes a motor and a brake, with the rope connected to the output end of the motor and the brake connected to the motor.

[0011] Optionally, the fixed pulley includes a first pulley, a second pulley, and a third pulley, all of which are mounted on a bracket. The rope includes a first rope, a second rope, and a third rope. The first rope is wound around the first pulley and connected to a first point of the electromagnetic chuck. The second rope is wound around the second pulley and connected to a second point of the electromagnetic chuck. The third rope is wound around the third pulley and connected to a third point of the electromagnetic chuck.

[0012] Optionally, the electromagnetic chuck and pulley assembly can be detachably connected.

[0013] Optionally, the drop test machine includes an infrared sensor connected to the base. The infrared sensor is used to detect the height of the electromagnetic chuck and transmit control signals to the drive assembly.

[0014] Optionally, the drop test machine includes a track set on a base, with an infrared sensor slidably connected to the track.

[0015] The beneficial effects of this utility model are as follows: This technical solution, through the aforementioned structural design, effectively solves the problem of excessive weight and difficulty in stably placing the battery under test on the test platform during traditional drop tests. The use of an electromagnetic chuck for vertical magnetic fixation replaces manual placement or mechanical clamping, greatly simplifying the operation process and reducing the labor intensity and safety risks for operators. The electromagnetic chuck's force direction is consistent with the direction of gravity, and the release is instantaneous when the magnetic attraction is disengaged, without applying lateral thrust or rotational force to the battery. Therefore, it ensures that the battery falls in a standard free-fall manner, eliminating the influence of other external forces or mechanical interventions on the test results, and greatly improving the accuracy and consistency of the test. The pulley assembly effectively reduces the resistance caused by friction during the driving process, making the entire lifting process smoother and more stable, improving the applicability and operating efficiency of the equipment. Through automated lifting and releasing processes, this embodiment not only improves testing efficiency but also ensures the safety and scientific rigor of the drop test. In summary, this drop testing machine, through its innovative structural design, significantly improves the drop testing performance for large-size, heavy-duty batteries, effectively achieving convenient operation, safety, reliability, and standardized testing, and has good prospects for widespread application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a drop test machine provided in one embodiment of the present invention; Figure 2 This is a top view of the drop test machine provided by this utility model; Figure 3 This is a schematic diagram of the drop test machine provided in another embodiment of the present invention.

[0018] Explanation of icon numbers: Base 10, load-bearing column 12, bracket 14, pulley assembly 20, fixed pulley 21, rope 22; Auxiliary wheel 23, movable pulley 24, first wheel 212, second wheel 214, third wheel 216; First rope 221, second rope 223, third rope 225, drive assembly 30, motor 31, brake 32; Electromagnetic chuck 40, current line 50, infrared sensor 60, track 70. Detailed Implementation

[0019] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, clearly and comprehensively demonstrating the technical solution. It should be noted that the listed embodiments are only a part of this utility model, and not all possible implementations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Please see Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a drop test machine provided in one embodiment of the present invention.

[0021] This embodiment provides a drop test machine for battery drop testing, including a base 10, a pulley assembly 20, a drive assembly 30, an electromagnetic chuck 40, and a current line 50. The base 10 provides stable support for the entire device. The pulley assembly 20 is mounted on the base 10 and is connected to the output end of the drive assembly 30 and the electromagnetic chuck 40, respectively, serving to transmit power and guide movement. The drive assembly 30 can be an electric motor, a hoisting mechanism, etc., which drives the electromagnetic chuck 40 to move vertically up and down via the pulley assembly 20. The current line 50 is electrically connected to the electromagnetic chuck 40 to provide current to it. During testing, the battery to be tested is placed below the electromagnetic chuck 40. Power is applied to the electromagnetic chuck 40 to generate magnetic force, firmly attracting the battery. Subsequently, the drive assembly 30 is activated, and the electromagnetic chuck 40 and the attracted battery are lifted together to a predetermined test height. Once the desired height is reached, the current is disconnected, the electromagnetic chuck 40 instantly loses its magnetic force, and the battery is then in a state where it is only subject to gravity, freely falling to the ground or the surface of the base 10, completing the entire drop test process.

[0022] This technical solution, through the aforementioned structural design, effectively solves the problem of excessive weight and difficulty in stable placement of the battery under test on the test platform in traditional drop tests. The use of an electromagnetic chuck 40 for vertical magnetic fixation replaces manual placement or mechanical clamping, greatly simplifying the operation process and reducing the labor intensity and safety risks for operators. The electromagnetic chuck 40 operates in the same direction as gravity, and releases instantaneously upon disengagement, without applying lateral thrust or rotational force to the battery. This ensures the battery falls in a standard free-fall manner, eliminating the influence of other external forces or mechanical interventions on the test results and significantly improving the accuracy and consistency of the test. The pulley assembly 20 effectively reduces the resistance caused by friction during the drive process, making the entire lifting process smoother and more stable, thus improving the applicability and operating efficiency of the equipment. Through automated lifting and releasing processes, this embodiment not only improves testing efficiency but also ensures the safety and scientific rigor of the drop test. In summary, this drop testing machine, through its innovative structural design, significantly improves the drop testing performance for large-size, heavy-duty batteries, effectively achieving convenient operation, safety, reliability, and standardized testing, and has good prospects for widespread application.

[0023] This embodiment provides a structurally improved drop test machine, specifically including a base 10, a pulley assembly 20, an electromagnetic chuck 40, and a drive assembly 30. The base 10 consists of a load-bearing column 12 and a support 14, with the column 12 and support 14 set at a certain angle. This structure effectively improves the overall stability and load-bearing capacity of the base 10, ensuring that the device will not tilt or shake during heavy battery drop tests. The support 14 serves as the mounting platform for the pulley assembly 20, providing sufficient space and height for the pulley assembly 20, contributing to a reasonable mechanical distribution of the entire system. The pulley assembly 20 includes a fixed pulley 21 and a rope 22. The fixed pulley 21 is fixedly mounted on the support 14, and the rope 22 is routed around the fixed pulley 21, with one end connected to the electromagnetic chuck 40 and the other end connected to the output end of the drive assembly 30. The drive assembly 30 can control the raising and lowering of the electromagnetic chuck 40 by extending and retracting the drive rope 22.

[0024] In operation, the electromagnetic chuck 40 is suspended below the fixed pulley 21 by the rope 22 at its lower end. After the battery under test is attracted by the electromagnetic chuck 40, the drive component 30 is activated, causing the rope 22 to wind around the fixed pulley 21, thus smoothly lifting the electromagnetic chuck 40 and the battery. Once the electromagnetic chuck 40 has lifted the battery to a predetermined height, the current to the electromagnetic chuck 40 is disconnected, causing the battery to instantly detach from the magnetic attraction and fall freely under the influence of gravity, thereby completing the drop test.

[0025] This technical solution significantly improves the load-bearing capacity and overall stability of the equipment by setting the load-bearing column 12 of the base 10 and the bracket 14 at an angle, effectively preventing the impact of excessive battery weight or shaking during movement on the test results. The pulley assembly 20 adopts a cooperative structure of fixed pulley 21 and rope 22, which not only simplifies the transmission path but also effectively distributes and transmits the vertical tension, ensuring that the electromagnetic chuck 40 moves smoothly in the vertical direction and avoiding uneven movement caused by friction or offset. In this way, the drive assembly 30 has higher lifting efficiency for the rope 22, and the movement process is smoother, providing a stable premise for subsequent free fall tests. In addition, the instantaneous disconnection of the electromagnetic chuck 40 ensures that the battery is only subjected to gravity at the moment of release, achieving a standard free fall.

[0026] In summary, this embodiment solves the technical problems of equipment shaking and instability during drop tests caused by unreasonable load-bearing structures in traditional equipment through structural optimization of the base 10 and reasonable layout of the pulley assembly 20. It achieves an overall improvement in load-bearing capacity, operational stability and testing accuracy of the drop test machine, thus providing reliable technical support for standard free-fall drop tests of large-size or heavy batteries and significantly enhancing the practicality and promotional value of the equipment.

[0027] This embodiment provides an improved battery drop test machine, characterized in that the current wire 50 is wound along the extension direction of the rope 22. In this device, one end of the current wire 50 is electrically connected to the input end of the electromagnetic chuck 40, and the other end is connected to the control power supply. To simplify the structure and improve the reliability of the device, the current wire 50 is not laid out separately, but is wound evenly along the extension direction of the rope 22 connected to the electromagnetic chuck 40 in a spiral manner, and moves together with the rope 22. In this way, during the process of the drive component 30 driving the rope 22 to rise and fall, the current wire 50 can synchronously extend and retract with the rope 22, and there will be no situation where the current wire 50 is entangled, pulled, or detached from the moving parts. At the same time, the winding method can also play a certain protective role for the current wire 50, avoiding damage to the current wire 50 due to external factors such as external pulling or wear.

[0028] This technical solution cleverly solves the problem of tangling, knotting, and even damage to the current wire 50, which is easily caused by separate wiring in traditional drop testing machines, by winding the current wire 50 along the extension direction of the rope 22. Since the current wire 50 is bound together with the rope 22 and moves together with the drive, interference with other components due to independent cable movement is avoided, greatly improving the simplicity and reliability of the overall structure. Furthermore, this winding structure effectively distributes the tension on the current wire 50 during movement, reducing fatigue damage caused by single-point stress and extending its service life. Through the above structural optimization, this technical solution achieves synchronous and coordinated movement of the current wire 50 and the rope 22, ensuring continuous and reliable power supply to the electromagnetic chuck 40 during lifting and lowering, significantly improving the safety and stability of drop testing, and providing strong support for the standardization and efficiency of battery drop testing. This innovative structure not only simplifies the assembly process but also reduces maintenance costs, showing good prospects for widespread application.

[0029] This embodiment provides an improved pulley lifting device. The pulley assembly 20 includes not only a fixed pulley 21 but also an auxiliary pulley 23. The auxiliary pulley 23 is mounted on the bracket 14 and is located on opposite sides of the fixed pulley 21 on the load-bearing column 12. Specifically, with the connection point between the load-bearing column 12 and the bracket 14 as the dividing line, the fixed pulley 21 and the auxiliary pulley 23 are respectively located at both ends of the bracket 14, thus achieving a seesaw distribution in the spatial structure. One end of the rope 22 is connected to the object being lifted, passes through the fixed pulley 21 and the auxiliary pulley 23 in sequence, and the other end is connected to the output end of the drive assembly 30. When the drive assembly 30 is working, it drives the rope 22 to run through the fixed pulley 21 and the auxiliary pulley 23, achieving stable lifting and lowering of the object being lifted. Since the fixed pulley 21 and the auxiliary pulley 23 are respectively distributed at both ends of the bracket 14, the tension of the rope 22 on the bracket 14 can be evenly distributed, thereby avoiding the bracket 14 from bending or deforming due to excessive force on one side.

[0030] This technical solution adds an auxiliary wheel 23 to the pulley assembly 20 and arranges the fixed pulley 21 and the auxiliary wheel 23 at both ends of the support 14 on both sides of the load-bearing column 12, with the connection point between the support 14 and the load-bearing column 12 as the dividing line. This ensures that the stress points of the rope 22 are symmetrically distributed, effectively solving the technical problem of uneven stress on the support 14 and easy bending or deformation caused by the unilateral arrangement of pulleys in traditional structures. Through the above structural design, the tension on both ends of the support 14 is balanced, greatly improving the overall stress uniformity and structural stability of the support 14, and preventing the risk of damage caused by stress concentration at one end. At the same time, the rope 22 runs more smoothly after being guided by the auxiliary wheel 23, further improving the stability and safety of the lifting device. In summary, this technical solution can effectively solve the problems of bending and deformation of the support 14 of the lifting device caused by uneven stress, achieving the technical effects of uniform stress distribution, reliable structure, and smooth lifting process in the pulley assembly 20, significantly improving the durability and safety of the device.

[0031] This embodiment provides a drop test machine with precise control capabilities, comprising a motor 31, a brake 32, and a rope 22. Specifically, one end of the rope 22 is connected to the battery under test, and the other end is connected to the output of the motor 31. The motor 31 drives the rope 22 to raise or lower the battery under test. Simultaneously, the brake 32 is connected to the motor 31 and is used to control the output of the motor 31 in real time. During the test, the motor 31 drives the rope 22 to move, raising the battery under test to a predetermined height. Once the battery reaches the set height, the brake 32 immediately activates, preventing the motor 31 from continuing to output power, thereby stopping further pulling of the rope 22 and ensuring that the battery under test is accurately maintained at the target height, ready for the next drop operation.

[0032] This technical solution, by adding a motor 31 and a brake 32 to the drop testing machine and connecting the brake 32 to the motor 31, achieves precise control over the driving and stopping of the rope 22. This effectively solves the technical problems of traditional drop testing machines, such as difficulty in accurately controlling the battery lifting height and the susceptibility to overshoot or positional deviation. When the battery under test reaches the predetermined height, the brake 32 promptly stops the motor 31 from continuing to pull the rope 22, ensuring accurate battery positioning and improving the standardization and repeatability of the test. This structure not only prevents equipment damage and safety hazards caused by excessive pulling but also helps ensure the accuracy and consistency of test results. Therefore, this technical solution, through the effective braking of the motor 31 by the brake 32, achieves precise control over the test height and safe and reliable equipment operation, significantly improving the practicality and reliability of the drop testing machine.

[0033] This embodiment provides a drop test machine structure that is easy to adapt to batteries of different specifications. The electromagnetic chuck 40 and the pulley assembly 20 adopt a detachable connection structure. The specific detachable connection method can be a conventional mechanical connection method such as a snap-fit ​​connection or a screw connection. Through the above design, during drop testing, the operator can easily and quickly change the electromagnetic chuck 40 of different specifications according to the size and weight of the battery to be tested. For example, for large batteries, a larger electromagnetic chuck 40 can be installed; for small batteries, a smaller electromagnetic chuck 40 can be used, thereby ensuring that the electromagnetic chuck 40 and the battery to be tested can achieve sufficient contact, ensuring that the battery to be tested can be stably and reliably attracted to the electromagnetic chuck 40. The replacement operation is simple and does not require complex adjustments to the pulley assembly 20 or other structures.

[0034] This technical solution effectively solves the technical problems of existing drop testing machines, such as poor chuck compatibility, weak adhesion, and cumbersome operation, by designing the electromagnetic chuck 40 and pulley assembly 20 as a detachable connection structure, allowing the use of various common connection methods such as clips and screws. By replacing the electromagnetic chuck 40 with different sizes, optimal adhesion area and force can be provided for batteries of different specifications, ensuring that the battery under test can be stably adhered during lifting and drop preparation, preventing accidental detachment before reaching the predetermined height, and improving the safety and accuracy of the test. Furthermore, the detachable structure greatly enhances the applicability and ease of operation of the equipment, reducing maintenance and replacement costs. In summary, this solution achieves the technical effects of strong adaptability of the electromagnetic chuck 40, reliable adhesion, and efficient operation, ensuring the safe, standardized, and efficient conduct of drop tests.

[0035] This embodiment discloses a drop test machine with height detection function. The drop test machine includes an infrared sensor 60, which is mounted on a base 10 and used to detect the height position of the electromagnetic chuck 40 in real time. The infrared sensor 60 non-contactly senses the movement trajectory of the electromagnetic chuck 40. When the electromagnetic chuck 40 (i.e., the component that drives the battery under test) moves to a predetermined height, the infrared sensor 60 detects this height change and immediately sends a control signal to the drive assembly 30 (such as a motor 31, controller, etc.) so that the drive assembly 30 stops the lifting action or triggers subsequent operations (such as power off, releasing the electromagnetic chuck 40, etc.). This structure enables real-time and accurate monitoring of the lifting height of the electromagnetic chuck 40 and the battery under test.

[0036] This technical solution introduces an infrared sensor 60 into the drop testing machine and connects it to the base 10, achieving high-precision detection and automatic feedback of the height of the electromagnetic chuck 40. This solution effectively solves the technical problems of large errors, slow response, and poor flexibility inherent in traditional drop testing machines that rely on manual or mechanical limit checks for height detection. The infrared sensor 60 can quickly and accurately detect whether the electromagnetic chuck 40 has reached the set height and promptly sends a control signal to the drive assembly 30, thereby automatically stopping the lifting or releasing the chuck, greatly improving the automation and safety of the test. Furthermore, infrared detection is non-contact, avoiding mechanical wear and error accumulation, and extending the equipment's lifespan and reliability. Therefore, this technical solution, through height detection and signal feedback using the infrared sensor 60, achieves precise control and automated operation of the height of the electromagnetic chuck 40 in the drop testing machine, improving the accuracy, safety, and efficiency of the test.

[0037] This embodiment provides a drop test machine structure based on the position of an adjustable infrared sensor 60. The drop test machine includes a track 70 mounted on a base 10, with the infrared sensor 60 slidably connected to the track 70. Specifically, the track 70 can be a long strip of metal, a guide rail, or other structure, and is securely mounted on the base 10. The infrared sensor 60 is connected to the track 70 via a slider, slide block, or other sliding components, allowing it to slide smoothly on the track 70. The operator can adjust the position of the infrared sensor 60 along the track 70 according to the height testing requirements of different batteries under test, fixing it at a suitable height so that the infrared sensor 60 can accurately detect when the electromagnetic chuck 40 is raised to the required predetermined height. When the electromagnetic chuck 40 lifts the battery under test to this height, the infrared sensor 60 detects and sends a control signal, achieving reliable height control.

[0038] This technical solution, by setting a track 70 on the base 10 and slidingly connecting the infrared sensor 60 to the track 70, allows for flexible and precise adjustment of the position of the infrared sensor 60. This solution effectively solves the technical problem in existing drop testing machines where the infrared sensor 60 has a fixed installation position and cannot adapt to different testing height requirements. By adjusting the position of the infrared sensor 60 along the track 70, the detection height can be flexibly adjusted according to the size of different batteries under test and testing requirements, ensuring that the electromagnetic chuck 40 is raised to the most suitable height in each test, thereby improving the adaptability and accuracy of the test. Furthermore, the sliding connection structure is simple to operate and easy to adjust, further improving the versatility and working efficiency of the testing machine. Therefore, this technical solution achieves flexible and adjustable height detection position in the drop testing machine, solving the problems of single height detection and poor adaptability, and improving the applicability and testing accuracy of the equipment.

[0039] Please see Figure 1 and Figure 2As shown, Figure 2 This is a top view of the drop test machine provided by this utility model.

[0040] This embodiment provides a lifting structure for a multi-point constraint electromagnetic chuck 40 in a drop test machine. The structure includes a fixed pulley 21 and multiple ropes 22 that cooperate with it. The fixed pulley 21 includes a first pulley 212, a second pulley 214, and a third pulley 216. The ropes 22 include a first rope 221, a second rope 223, and a third rope 225, which are respectively wound around the first pulley 212, the second pulley 214, and the third pulley 216. The other ends of the three ropes 22 are connected to the first, second, and third points of the electromagnetic chuck 40, respectively.

[0041] In actual operation, three ropes 22 apply tension to the electromagnetic chuck 40 through corresponding pulleys, and the three ropes 22 correspond to different connection points on the electromagnetic chuck 40 (i.e., the first point, the second point, and the third point), forming a three-point lifting and constraint structure. This three-point constraint structure enables the electromagnetic chuck 40 to maintain a stable posture during lifting or movement, avoiding tilting, swaying, or rotation caused by single-point or two-point lifting.

[0042] This technical solution achieves three-point constraint on the electromagnetic chuck 40 by setting up three pulleys and corresponding three ropes 22, and connecting the three ropes 22 to three different points of the electromagnetic chuck 40. Compared with the single-point or two-point connection method in the prior art, which is prone to problems such as tilting and swaying of the electromagnetic chuck 40 during the lifting process, and even affecting the clamping stability of the object being measured, this solution can effectively solve the above-mentioned technical problems.

[0043] Through three-point constraints, the electromagnetic chuck 40 experiences uniform force and balanced force at each point during lifting and releasing, significantly improving its overall stability and attitude maintenance capability. This ensures that during drop tests, the electromagnetic chuck 40 can accurately and smoothly complete clamping, lifting, and releasing actions, avoiding test deviations or equipment damage caused by instability. Ultimately, this optimizes the structure of the testing device, improving the safety, consistency, and accuracy of the test.

[0044] Please see Figure 3 As shown, Figure 3 This is a top view of a drop test machine provided in another embodiment of the present invention.

[0045] This embodiment provides a pulley assembly 20 structure with a movable pulley 24 for use in the lifting system of a drop test machine. In addition to a conventional fixed pulley 21, the pulley assembly 20 includes at least one movable pulley 24. The movable pulley 24 is connected to an electromagnetic chuck 40 via a connector. One end of a rope 22 is fixed to a bracket 14, and the rope 22 winds around the movable pulley 24 and the fixed pulley 21 in sequence, finally connecting to the drive assembly 30. With this structure, the electromagnetic chuck 40, under the traction of the drive assembly 30, is lifted and lowered by the action of the movable pulley 24.

[0046] In practical use, when the drive assembly 30 pulls the rope 22, the movable pulley 24 moves together with the electromagnetic chuck 40. The structure of the movable pulley 24 reduces the required pulling force. At the same time, the moving distance and speed of the rope 22 are proportional to the actual moving distance and speed of the electromagnetic chuck 40 (for example, with a double movable pulley 24 structure, the moving distance of the rope 22 is twice the actual moving distance of the load, and the speed of the rope 22 is twice the speed of the load). In this way, when the electromagnetic chuck 40 is raised or lowered, the movement is more stable and the force is more even, effectively preventing adverse effects on the battery and equipment under test caused by sudden changes in pulling force or excessive speed.

[0047] This technical solution effectively solves the technical problems of existing drop test machine lifting systems, such as high pulling force, high power consumption, difficulty in speed control, and easy swaying during the lifting process, by introducing a movable pulley 24 structure into the pulley assembly 20. Specifically, the movable pulley 24 shares part of the load, significantly reducing the tensile power required by the drive assembly 30, thereby reducing energy consumption and mechanical wear, and improving the reliability and service life of the system. At the same time, the movable pulley 24 structure reduces the movement speed of the rope 22, making the lifting or lowering process of the electromagnetic chuck 40 and the battery under test smoother, avoiding swaying and impact caused by excessive speed, and improving the safety, accuracy, and controllability of the test process.

[0048] Therefore, by setting the movable pulley 24, this technical solution achieves the technical effects of reducing driving power, slowing down the lifting speed, and ensuring stable operation, thus realizing a dual improvement in system operating efficiency and test safety.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0050] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0051] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0052] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A drop test machine, characterized in that, The drop test machine includes: a base, a pulley assembly, a drive assembly, an electromagnetic chuck, and a current line. The pulley assembly is disposed on the base and is connected to the output end of the drive assembly and the electromagnetic chuck. The drive assembly is used to drive the electromagnetic chuck to move upward or downward through the pulley assembly. The current line is electrically connected to the electromagnetic chuck. The electromagnetic chuck is used to magnetically attract the battery to be tested. The pulley assembly includes a fixed pulley and a rope, and the base includes a support; The fixed pulley includes a first pulley, a second pulley, and a third pulley, all of which are mounted on the bracket. The rope includes a first rope, a second rope, and a third rope. The first rope is wound around the first pulley and connected to a first point of the electromagnetic chuck. The second rope is wound around the second pulley and connected to a second point of the electromagnetic chuck. The third rope is wound around the third pulley and connected to a third point of the electromagnetic chuck. The current wire is wound along the extension direction of the rope.

2. The drop test machine according to claim 1, characterized in that, The base includes a load-bearing column, which is angled to the support; a fixed pulley is mounted on the support, and a rope is wound around the fixed pulley. The rope is connected to the output end of the electromagnetic chuck and the drive assembly, respectively.

3. The drop test machine according to claim 2, characterized in that, The pulley assembly also includes an auxiliary wheel, which is mounted on the bracket. The auxiliary wheel and the fixed pulley are located on opposite sides of the load-bearing column. The rope is further wound around the auxiliary wheel and then connected to the output end of the drive assembly.

4. The drop test machine according to claim 2, characterized in that, The pulley assembly also includes a movable pulley, which is connected to the electromagnetic chuck, and the rope is wound around the movable pulley and then connected to the bracket.

5. The drop test machine according to claim 2, characterized in that, The drive assembly includes a motor and a brake, the rope is connected to the output end of the motor, and the brake is connected to the motor.

6. The drop testing machine according to any one of claims 1 to 5, characterized in that, The electromagnetic chuck is detachably connected to the pulley assembly.

7. The drop test machine according to any one of claims 1 to 5, characterized in that, The drop test machine includes an infrared sensor connected to the base. The infrared sensor is used to detect the height of the electromagnetic chuck and transmit control signals to the drive assembly.

8. The drop test machine according to claim 7, characterized in that, The drop test machine includes a track, which is mounted on the base, and the infrared sensor is slidably connected to the track.

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