Variable-frequency series resonance test device

Abstract

The invention discloses a variable-frequency series resonance test device, and belongs to the technical field of series resonance test devices.The test device comprises a test device body, a containing cavity is formed in the lower end of the test device body, a partition plate is arranged in the containing cavity, a winding assembly is assembled on the partition plate, and one end of a cable for the test device body is connected with a test device body interface; one end of the winding assembly is connected with a motor, the other end of the winding assembly is connected with external equipment, the rest part of the winding assembly is wound on the winding assembly, the winding assembly comprises a winding roller, the winding roller is composed of a roller column and baffles at the two ends, the roller column is of a hollow structure, a fan is installed in the roller column, and air holes are circumferentially formed in the roller column. According to the device, through the design of the winding assembly and the wire pipe, orderly storage and management of cables are achieved, disorder and damage of the cables are avoided, the wound cables are effectively cooled in real time through the design of the fan arranged in the winding roller and the air holes distributed in the circumferential mode, the cables are prevented from being overheated in the high-voltage test process, and the service life of the cables is prolonged. And the operation safety and stability of the device are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of series resonance test devices, specifically a frequency conversion series resonance test device. Background Technology

[0002] In the existing technology, the frequency conversion series resonant tester requires the use of a large number of wires. After use, the wires are not easy to classify and store, and it is not easy to find them quickly when used again. Moreover, the multiple strands of wires are piled up in a mess, which can easily lead to wire tangling.

[0003] Chinese invention patent CN114200173B discloses a variable frequency series resonance test device. A wire is wound around a sleeve. As the winding height of the wire increases, the pressure plate is raised, i.e., the first spring is tensioned. During the winding process, the wire passes through a threading frame and is cleaned by two sets of cleaning brushes. This prevents particles from crushing the wire's protective layer during winding. The cleaning brushes are elastically pulled by a traction handle in conjunction with a second spring, bringing the two sets of cleaning brushes closer together to prevent brush bristle wear and ensure proper cleaning. After winding, the assembly frame is pushed into the assembly slot, where the anti-detachment sliding plate is positioned to prevent the assembly frame from falling off. After the traction force of the braking plate is released, the braking plate is pushed back by the elastic traction plate, and its bottom end inserts into a limiting slot, thus braking the assembly frame and preventing it from sliding. At this point, the wound wire is protected between the variable frequency series resonance tester and the assembly frame.

[0004] Cables are stored by winding them onto a take-up device. However, during use, the cable may not be completely released from the initial inspection device, leaving a certain amount still wrapped around the take-up device. The heat generated by the cable during use, combined with the heat trapped on the take-up device, can accelerate cable aging and, in severe cases, cause a fire. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A variable frequency series resonant test device includes a main body of the test device. A cavity is formed at the lower end of the main body, containing a partition plate. A winding assembly is mounted on the partition plate. One end of a cable is connected to the main body's interface, and the other end is connected to external equipment. The remaining portion is wound around the winding assembly. A cabinet door is connected to the front surface of the cavity via a hinge, and the cabinet door has holes for the cable to extend out. The winding assembly includes a winding roller, which consists of a roller column and baffles at both ends. The roller column is hollow and contains a fan. The roller column has circumferentially vented holes. A conduit with an L-shaped structure is connected through the lower side of the roller column, with the center of the conduit's end coinciding with the center of the winding roller. The main body of the test device is wound with a cable spirally around the roller column. The end of the cable passes through the conduit and is connected to a rotating connector. The cable is connected to the main body's conductor via the rotating connector, and the other end extends outside the device, thus achieving electrical connection between the main body of the test device and the external equipment.

[0008] Preferably, the outer side of the roller is provided with multiple grooves at equal intervals in a circular pattern. The grooves are channel steel structures. The side of the groove that is in contact with the roller has through holes that coincide with the air vents. The cable is wound around the groove, thereby preventing the cable from blocking the air vents and affecting the air output.

[0009] Preferably, the outer side of the baffle at the lower end of the winding roller is provided with a ring of roller teeth, and a driver is mounted on the baffle. The driving end of the driver is fixedly connected to a driving gear, which meshes with the roller teeth.

[0010] Preferably, the partition has a pair of waist holes, and the waist holes are covered with a slide plate. The slide plate is connected to an L-shaped plate through one of the waist holes, and the driver is placed on the L-shaped plate. The drive shaft of the driver passes through the slide plate and is connected to the drive gear. The lower surface of the slide plate is also provided with a constraint block that is slidably connected to the other waist hole.

[0011] Preferably, the partition plate has a circular hole with the same inner diameter as the roller, and the bottom of the winding roller is provided with a bearing. The winding roller is rotatably connected to the partition plate through the bearing, and the inner ring diameter of the bearing is equal to the diameter of the circular hole on the partition plate.

[0012] Preferably, the upper surface of the winding roller is provided with a fixed cylinder, and a driving bevel gear is fixedly sleeved on the fixed cylinder. A driven bevel gear meshes with the driving bevel gear, and a large gear is fixedly connected to the rear surface of the driven bevel gear. A rack meshes with one side of the large gear. The upper surface of the rack penetrates through the main body of the experimental device and is exposed. When the winding roller releases the wire, the driving bevel gear drives the driven bevel gear to rotate counterclockwise, and then the large gear drives the rack to rise. The height of the rack's rise is observed to understand the degree of cable release.

[0013] Preferably, the rack has grooves on its front and rear surfaces, and corresponding irregular holes are formed on the upper surface of the experimental device body and on the partition plate. Before the rack rises, its lower end is inserted into the partition plate, and when the rack rises, it slides into the irregular holes on the upper surface of the experimental device body.

[0014] Preferably, the rack is made of a lightweight material, and a constraint slider is provided on the side of the rack opposite to the receiving cavity, and a groove is provided on the inner wall of the receiving cavity to match the constraint slider.

[0015] Preferably, a relief groove is provided on the main body of the experimental device at the point where the rack passes through. After the rack rises, it is located in the relief groove. A scale value is provided on one side of the front surface of the relief groove. A pointer is provided on the upper surface of the rack, and the pointer extends out from the relief groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The device in this invention realizes the orderly storage and management of cables through the design of winding components and conduits, avoiding cable chaos and damage. One end of the cable is connected to the main interface of the experimental device, and the other end is connected to the external equipment. The middle part is neatly wound on the winding roller, which greatly improves the efficiency of the experimental device. The winding roller has a built-in fan and a circumferentially distributed air hole design to cool the wound cable in real time and prevent the cable from overheating during the high voltage test, thus improving the safety and stability of the device operation. Furthermore, the groove plate and air hole design on the outer side of the roller ensure that the cable will not block the air hole, thus maximizing the cooling effect, especially under high current working conditions, effectively preventing the cable from overheating.

[0017] (2) The transmission mechanism of the drive bevel gear, driven bevel gear and rack in this invention can intuitively show the degree of cable release when the winding roller releases the cable. With the help of pointer and scale value, the operator can accurately understand the working status of the device. The rack is made of lightweight material, which reduces the operating resistance and prevents the large gear from rotating clockwise due to its own weight, which would cause the cable to be rewound. Attached Figure Description

[0018] Figure 1 This is the three-dimensional structure of the experimental apparatus in this invention. Figure 1 .

[0019] Figure 2 This is the three-dimensional structure of the experimental apparatus in this invention. Figure 2 .

[0020] Figure 3 This is the three-dimensional structure of the experimental apparatus in this invention. Figure 3 .

[0021] Figure 4 This is the three-dimensional structure of the winding assembly in this invention. Figure 1 .

[0022] Figure 5 This is the three-dimensional structure of the winding assembly in this invention. Figure 2 .

[0023] Figure 6 This is a cross-sectional view of the winding roller in the present invention. Figure 1 .

[0024] Figure 7 This is a cross-sectional view of the winding roller in the present invention. Figure 2 .

[0025] Figure 8 This is a schematic diagram of the working state of the winding assembly in this invention.

[0026] The correspondence between the labels and component names in the attached figures is as follows: 100. Main body of the experimental apparatus; 101. Clearance groove; 102. Cabinet door; 103. Partition. 200. Winding assembly; 201. Winding roller; 201a. Roller column; 201b. Baffle; 201c. Roller tooth; 201d. Groove plate; 201e. Conduit; 201f. Fan; 202. Slide plate; 2021. Driver; 2022. Drive gear; 203. Driving bevel gear; 204. Driven bevel gear; 2041. Large gear; 205. Rack; 2051. Pointer; 2052. Constraint slider. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0030] like Figure 1-3As shown, a variable frequency series resonance test device includes a main body 100, which is the variable frequency series resonance test device. Its components are placed inside the main body 100, and the shell of the main body 100 is heightened. A receiving cavity is formed at the lower end of the main body 100, and a partition 103 is placed inside the receiving cavity. A winding assembly 200 is mounted on the partition 103. One end of a cable is connected to the main body 100 interface, and the other end is connected to external equipment. The remaining portion is wound around the winding assembly 200. The winding assembly 200 includes a winding roller 201, which solves the problems of cable messiness and storage during the experiment. The winding roller 201 consists of a roller column 201a and baffles 201b at both ends. The baffles 201b prevent the wound cable from slipping off from both sides, ensuring that the cable is neatly arranged. Figure 7 In the design, roller 201a has a hollow structure, and a fan 201f is installed inside. Roller 201a also has circumferentially shaped air vents. The hollow design of roller 201a and the built-in fan 201f form an intelligent heat dissipation system. When the cable is powered on, it generates heat. The fan 201f provides forced ventilation and heat dissipation through the air vents on the surface of roller 201a, effectively preventing overheating and aging of the cable, extending its service life, and improving safety. Figure 6 and Figure 7 In the middle, a cable conduit 201e is connected through the lower side of the roller 201a. The cable conduit 201e has an L-shaped structure, and the center of the end of the cable conduit 201e coincides with the center of the winding roller 201. This ensures that the cable maintains a stable connection when the winding roller 201 rotates, preventing it from twisting or breaking due to rotation. Figure 8 In the experiment, the main body 100 of the experimental device is wound with a cable in a spiral shape on the roller 201a. The end of the cable passes through the conduit 201e and is connected to a rotating connector. The cable is connected to the wire of the main body 100 of the experimental device through the rotating connector, and the other end extends to the outside of the device to realize the electrical connection between the main body 100 of the experimental device and the external equipment.

[0031] exist Figure 6If the cable is directly wound around the roller 201a, the winding of the cable will block the air vents, resulting in a decrease in heat dissipation efficiency. The air blown out by the fan 201f cannot diffuse outward through the air vents to dissipate heat from the cable. Therefore, in this embodiment, multiple grooved plates 201d are provided in a circular and equidistant manner on the outer side of the roller 201a. The grooved plates 201d are channel steel structures. The cable is wound around the grooved plates 201d, thereby avoiding the cable blocking the air vents and affecting the airflow. The grooved plates 201d are used to spread the wound cable, thereby avoiding direct contact between the cable and the roller 201a, so that a certain space is formed between the cable and the roller 201a, which is conducive to the air blown by the fan 201f blowing through the cavity to blow the cable. Furthermore, in order to enhance the airflow, this embodiment has through holes that coincide with the air vents on the side of the grooved plate 201d that is in contact with the roller 201a, thereby increasing the airflow.

[0032] exist Figure 4 and Figure 5In this embodiment, a ring of roller teeth 201c is provided on the outer side of the baffle 201b at the lower end of the winding roller 201, and a driver 2021 is mounted on the partition 103. The driving end of the driver 2021 is fixedly connected to a driving gear 2022, which meshes with the roller teeth 201c. In this embodiment, the roller teeth 201c on the outer side of the baffle 201b at the lower end of the winding roller 201 form a gear structure, serving as a power transmission component. The roller teeth 201c mesh with the driving gear 2022 to realize power transmission. For precise transmission, a pair of waist holes are provided on the partition 103, and a slide plate 202 is covered on the waist holes. The slide plate 202 is connected to an L-shaped plate through one of the waist holes, and the driver 2021 is placed on the L-shaped plate. The drive shaft of the driver 2021 passes through the slide plate 202 and is connected to the drive gear 2022. The lower surface of the slide plate 202 is also provided with a constraint block that is slidably connected to the other waist hole. In this embodiment, the driver 2021 drives the drive gear 2022 to rotate, thereby utilizing the rotating drive gear 2022 to achieve precise transmission. 22 drives the winding roller 201, which has teeth 201c at its lower end, to rotate and wind the used cable for storage. The L-shaped plate and the sliding plate 202 form a structure that can slide on the waist hole. By moving the sliding plate 202, the engagement or disengagement of the drive gear 2022 with the teeth 201c can be manually controlled. When cable winding is needed, pushing the sliding plate 202 towards the winding roller 201 engages the drive gear 2022 with the teeth 201c, activating the driver 2021 to achieve automatic cable winding. During use, pushing the slide plate 202 away from the winding roller 201 causes the drive gear 2022 to disengage from the roller teeth 201c. This prevents the winding roller 201 from rotating in the opposite direction when the cable is pulled, which would cause the rotational force to be transmitted to the driver 2021 and damage the internal components of the driver 2021. Alternatively, it avoids the situation where some drivers 2021 do not have bidirectional rotation function, and the winding roller 201 cannot rotate in the opposite direction due to the meshing of the drive gear 2022 and the roller teeth 201c.

[0033] Furthermore, in this embodiment, a circular hole with the same inner diameter as the roller 201a is provided on the partition 103 to allow the cable to pass through. A bearing is provided at the bottom of the winding roller 201, and the winding roller 201 is rotatably connected to the partition 103 via the bearing. The inner diameter of the bearing is equal to the diameter of the circular hole on the partition 103. The bearing ensures that the winding roller 201 can rotate without affecting the cable's extension from the circular hole in the partition 103. A cabinet door 102 is connected to the front surface of the receiving cavity via a hinge, and the cabinet door 102 has a hole for the cable to extend out. After passing through the circular hole in the partition 103, the cable arrives at the space below the partition 103. At this point, a rotating structure is installed at the end of the cable and connected to the conductor of the main body 100 of the experimental device via a rotating joint. This structure ensures that when the winding roller 201 is winding or retracting the cable, its rotational force will not be transmitted through the cable to the conductor carried by the main body 100 of the experimental device, thus preventing the conductor from being twisted. The other end of the cable extends to the outside of the device and connects to external equipment by opening a hole in the cabinet door 102.

[0034] exist Figure 4 and Figure 5 In the experiment, the upper surface of the winding roller 201 is provided with a fixed cylinder, and a driving bevel gear 203 is fixedly sleeved on the fixed cylinder. The design of the fixed cylinder and the driving bevel gear 203 forms a stable power transmission basis, ensuring the effective transmission of rotational torque. A driven bevel gear 204 meshes with the driving bevel gear 203. The right-angle transmission structure of the driving bevel gear and the driven bevel gear 204 can convert horizontal rotation into vertical rotation, which greatly reduces the transmission space requirement and improves the compactness of the device. A large gear 2041 is fixedly connected to the rear surface of the driven bevel gear 204. A rack 205 meshes with one side of the large gear 2041. The upper surface of the rack 205 penetrates the main body 100 of the experimental device and is exposed. The meshing mechanism of the large gear 2041 and the rack 205 realizes the conversion of rotational motion into linear motion. The precise conversion of motion is achieved by the drive bevel gear 204 to rotate counterclockwise via the active bevel gear 203 when the winding roller 201 releases the cable. This, in turn, drives the rack 205 to rise via the large gear 2041. The degree of cable release can be observed by observing the height of the rack 205's rise. The core function of the winding roller 201 system is to convert the rotational motion of the cable into the linear motion of the rack, thereby achieving visual monitoring. When the cable is released, the distance the rack 205 rises is proportional to the length of cable released, providing the observer with intuitive visual feedback. In summary, the entire system, through the principle of mechanical transmission, converts the rotation of the winding roller into the linear displacement of the rack, and displays it on a scale, achieving intuitive and accurate monitoring of the degree of cable release. Operators can obtain experimental data without complex calculations.

[0035] exist Figure 4 and Figure 8In the experiment, the rack 205 has grooves on its front and rear surfaces, and the upper surface of the main body 100 of the experimental device and the partition 103 have corresponding irregular holes. Before the rack 205 rises, its lower end is inserted into the partition 103. When the rack 205 rises, it slides into the irregular hole on the upper surface of the main body 100 of the experimental device. The matching design of the grooves on the front and rear surfaces of the rack 205 and the irregular hole effectively prevents the rack from rotating during the lifting process, ensuring the accuracy and stability of the indicating system. The through design of the rack from the partition 103 to the upper surface of the experimental device exposes the indicating part, making it easy to observe directly.

[0036] Furthermore, the rack 205 is made of a lightweight material, and a constraint slider 2052 is provided on the side of the rack 205 opposite to the receiving cavity. Correspondingly, a groove is provided on the inner wall of the receiving cavity to fit the constraint slider 2052. The use of a lightweight material to make the rack 205 reduces the system load, improves sensitivity and response speed, and prevents the large gear 2041 from rotating clockwise due to the weight of the rack 205, which would cause the cable to be rewound. The cooperation mechanism between the constraint slider 2052 and the groove further enhances the motion stability of the rack, reduces lateral sway, and ensures measurement accuracy.

[0037] exist Figure 1 and Figure 3 In the experimental apparatus, a relief groove 101 is provided on the main body 100 and at the through point of the rack 205. The relief groove 101 provides a protective space for the rack after it rises, preventing the exposed part of the rack 205 from being damaged by external forces. After the rack 205 rises, it is located in the relief groove 101. A scale value is provided on one side of the front surface of the relief groove 101. A pointer 2051 is provided on the upper surface of the rack 205 and extends out of the relief groove 101. The indication system composed of the scale value and the pointer 2051 realizes the quantitative measurement of the cable release degree, making the experimental data more accurate and reliable.

[0038] In this embodiment, the main body 100 of the experimental setup is a frequency-converter series resonant test device. This device operates based on the principle of series resonant circuits. When the inductor L and capacitor C are connected in series in the circuit, if the resonance condition is met, the circuit impedance reaches its minimum value and the current reaches its maximum value. At this time, the voltage across the capacitor can reach a multiple of the quality factor of the input voltage. The frequency-controlled power supply generates an adjustable frequency voltage, and by adjusting the frequency, the circuit reaches a series resonant state. The test object participates in the resonance as a capacitive element in the circuit. Due to the resonance effect, only a relatively small power supply is needed to generate a high voltage across the test object for withstand voltage testing. In this embodiment, the mechanical structure of the frequency conversion series resonant test device mainly consists of three systems: a cable management system, a cooling system, and an indicator system. The specific working principle is as follows: Cable management system structure: The accommodating cavity at the lower end of the main body 100 of the experimental apparatus, The partition 102 and the winding assembly 200 are housed within the cavity. The winding roller 201 (composed of roller column 201a and baffles 201b at both ends) Conduit 201e and swivel joint, The driver 2021 and the transmission mechanism (drive gear 2022 and roller gear 201c). Cable routing method: The other end of the cable is led out through an L-shaped conduit 201e and connected to the internal circuitry of the main body 100 of the experimental apparatus via a rotary joint. The middle portion of the cable is spirally wound around roller 201a. The other end of the cable extends out of the device to connect with an external device. During this process, a socket or plug can be installed on the other end of the cable.

[0039] Winding mechanism working process: When the driver 2021 starts, it drives the roller teeth 201c at the lower end of the winding roller 201 to rotate via the drive gear 2022. The winding roller 201 rotates to release or retract the cable. The waist hole on the partition 103 and the design of the slide plate 202 allow for adjustment of the position of the driver 2021 to ensure proper engagement or disengagement with the roller teeth 201c. (A pin structure can be set in the substructure to ensure that the slide plate 202 will not be displaced due to the vibration of the driver 2021. The pin installation is as follows: according to existing technology and conventional usage, the pin is set on the slide plate 202 and a pin hole is opened in the partition 103.) The bearing design ensures that the winding roller rotates smoothly.

[0040] Cooling system structure: Hollow structure roller 201a, The fan 201f is installed inside the roller 201a. The circumferentially distributed air holes on the surface of roller 201a The grooved plate 201d structure on the outer side of the roller 201a.

[0041] Cooling process: Fan 201f starts, generating a stable airflow inside roller 201a. Airflow exits through circularly distributed vents. The airflow directly contacts the cable wrapped around the outside of the roller 201a, carrying away heat. The 201d channel plate features a channel steel structure design, ensuring that cables are arranged in an orderly manner between the air vents without obstructing the airflow, thus forming a direct cooling channel from the fan to the air vents and then to the cables.

[0042] Temperature control mechanism: Fan 201F runs continuously to maintain a stable cooling airflow. The 201d channel plate structure maintains a certain distance between the cables and the air vents, creating a good heat exchange space. To achieve effective cooling of cables under high voltage and high current operating conditions and prevent overheating.

[0043] The structure of the indicator system consists of: The fixing cylinder on the upper surface of the winding roller 201 Driven bevel gear 203 and driven bevel gear 204, The large gear 2041 is combined with the rack 205. The pointer 2051 on the rack 205 is aligned with the scale on the main body.

[0044] Transmission link: The rotation of the winding roller 201 drives the drive bevel gear 203 on the fixed cylinder to rotate. The driving bevel gear 203 drives the driven bevel gear 204 to rotate counterclockwise. Driven bevel gear 204 drives large gear 2041 to rotate. The large gear 2041 drives the rack 205 to rise or fall.

[0045] Indication principle: When the winding roller 201 unwinds the wire, the transmission system causes the rack to rise. The rise height of rack 205 directly reflects the cable release length. The pointer on rack 205 moves before the scale value, visually indicating the degree of cable release. The front and rear surface grooves and irregular holes of rack 205 ensure smooth up-and-down movement. The lightweight 205 rack material and the constraint slider design reduce friction, improve indication accuracy, and prevent reset due to its own weight.

[0046] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A variable frequency series resonant test device, comprising a main body (100) of the test device, wherein a receiving cavity is provided at the lower end of the main body (100), a partition (103) is placed inside the receiving cavity, and a winding assembly (200) is mounted on the partition (103). One end of a cable is connected to the interface of the main body (100) of the test device, the other end is connected to an external device, and the remaining part is wound on the winding assembly (200). Its features are: The winding assembly (200) includes a winding roller (201), which is composed of a roller column (201a) and baffles (201b) at both ends. The roller column (201a) is hollow and a fan (201f) is installed inside the roller column (201a). The roller column (201a) has circumferentially vent holes. A conduit (201e) is connected through the lower side of the roller column (201a). The conduit (201e) is L-shaped and the center of the end of the conduit (201e) coincides with the center of the winding roller (201). The experimental device body (100) is wound with a cable in a spiral shape on the roller column (201a). The end of the cable passes through the conduit (201e) and is connected to a rotating joint. The cable is connected to the conductor of the experimental device body (100) through the rotating joint, and the other end extends to the outside of the device, thereby realizing the electrical connection between the experimental device body (100) and the external equipment.

2. The variable frequency series resonant test device according to claim 1, characterized in that: The outer side of the roller (201a) is provided with multiple grooved plates (201d) at equal intervals in a circular pattern. The grooved plates (201d) are channel steel structures. The side of the grooved plate (201d) that is in contact with the roller (201a) has a through hole that coincides with the air hole. The cable is wound on the grooved plate (201d) to avoid the cable blocking the air hole and affecting the air outlet.

3. The variable frequency series resonant test device according to claim 2, characterized in that: The outer side of the baffle (201b) at the lower end of the winding roller (201) is provided with a ring of roller teeth (201c), and the partition (103) is equipped with a driver (2021). The driving end of the driver (2021) is fixedly connected to a driving gear (2022), and the driving gear (2022) meshes with the roller teeth (201c).

4. The variable frequency series resonant test device according to claim 3, characterized in that: The partition (103) has a pair of waist holes, and the waist holes are covered with a slide plate (202). The slide plate (202) is connected to an L-shaped plate through one of the waist holes, and the driver (2021) is placed on the L-shaped plate. The drive shaft of the driver (2021) passes through the slide plate (202) and is connected to the drive gear (2022). The lower surface of the slide plate (202) is also provided with a constraint block that is slidably connected to the other waist hole.

5. The variable frequency series resonant test device according to claim 1, characterized in that: The partition plate (103) has a circular hole with the same inner diameter as the roller (201a), and the bottom of the winding roller (201) is provided with a bearing. The winding roller (201) is rotatably connected to the partition plate (103) through the bearing. The inner diameter of the bearing is equal to the diameter of the circular hole on the partition plate (103).

6. The variable frequency series resonance test device according to claim 5, characterized in that: The upper surface of the winding roller (201) is provided with a fixed cylinder, and a driving bevel gear (203) is fixedly sleeved on the fixed cylinder. A driven bevel gear (204) meshes with the driving bevel gear (203), and a large gear (2041) is fixedly connected to the rear surface of the driven bevel gear (2041). A rack (205) meshes with one side of the large gear (2041). The upper surface of the rack (205) penetrates the main body (100) of the experimental device and is exposed. When the winding roller (201) releases the wire, the driven bevel gear (204) is driven to rotate counterclockwise by the driving bevel gear (203), and then the rack (205) is driven to rise by the large gear (2041). The height of the rack (205) is observed to understand the degree of wire release.

7. The variable frequency series resonant test device according to claim 6, characterized in that: The rack (205) has grooves on its front and rear surfaces, and the upper surface of the experimental device body (100) and the partition plate (103) are provided with corresponding irregular holes. Before the rack (205) rises, its lower end is inserted into the partition plate (103). When the rack (205) rises, it slides in connection with the irregular hole on the upper surface of the experimental device body (100).

8. The variable frequency series resonance test device according to claim 6, characterized in that: The rack (205) is made of a lightweight material, and a constraint slider (2052) is provided on the side of the rack (205) opposite to the receiving cavity. Correspondingly, a groove is provided on the inner wall of the receiving cavity to match the constraint slider (2052).

9. The variable frequency series resonant test device according to claim 1, characterized in that: A clearance groove (101) is provided on the main body (100) of the experimental device and at the point through which the rack (205) passes. After the rack (205) rises, it is located in the clearance groove (101). A scale value is provided on one side of the front surface of the clearance groove (101). A pointer (2051) is provided on the upper surface of the rack (205), and the pointer (2051) extends out from the clearance groove (101).

10. The variable frequency series resonant test device according to claim 1, characterized in that: The front surface of the cavity is connected to a cabinet door (102) via a hinge, and the cabinet door (102) has a hole for cables to extend out.

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