Inductance regulating device

Abstract

The utility model relates to the technical field of electromagnetic induction discloses an inductance adjusting device, include: first inductance coil and second inductance coil, first inductance coil and second inductance coil coaxial arrangement, first drive mechanism, drive end is connected with second inductance coil, is suitable for making second inductance coil along second inductance coil axial direction movement. Through with first inductance coil and second inductance coil adopt coaxial arrangement mode, and utilize first drive mechanism drive second inductance coil along axial movement, realized the continuous adjustable of inductance value. Through change first inductance coil and second inductance coil's axial relative position can accurate regulation mutual inductance coefficient, adopt mechanical drive mode to adjust coil spacing, compared with traditional fixed inductance or switch switching type regulation, can realize more smooth, more delicate inductance value change, simple and reliable structure form simultaneously, need not complex circuit design to realize inductance parameter's dynamic adjustment.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic induction technology, specifically to an inductance adjustment device. Background Technology

[0002] Mutual inductance is an electromagnetic induction phenomenon where a change in current in one coil induces an electromotive force in a nearby coil. It is not limited to two coils wound on the same iron core; it can occur between any two closely spaced circuits. Mutual inductance has wide applications in the field of electromagnetic induction technology, allowing energy or signals to be easily transferred from one coil to another. The magnitude of the mutual inductance coefficient is determined by the geometry, size, relative position, number of turns of each coil, and the permeability of the surrounding medium. Based on this principle, devices such as transformers and induction coils have been developed.

[0003] In existing transformers, the distance between the coils is relatively fixed. This makes it difficult to change the mutual inductance coefficient once the coils are fixed, and voltage fluctuations can only be performed according to the predetermined design. If the distance between the coils needs to be changed, the transformer must be redesigned, leading to increased costs and reduced efficiency. Utility Model Content

[0004] In view of this, the present invention provides an inductance adjustment device to solve the problem of poor distance adjustment effect between inductors in the prior art.

[0005] This utility model provides an inductance adjustment device, comprising:

[0006] The first inductor and the second inductor are coaxially arranged.

[0007] The first driving mechanism has its driving end connected to the second inductor coil and is adapted to make the second inductor coil move along the axial direction of the second inductor coil.

[0008] Beneficial effects: By arranging the first and second inductors coaxially and using a first driving mechanism to drive the second inductor to move axially, continuous adjustment of the inductance value is achieved. The mutual inductance coefficient can be precisely adjusted by changing the axial relative position of the first and second inductors. The mechanical drive method for adjusting the coil spacing, compared to traditional fixed inductance or switch-type adjustment, enables smoother and more precise changes in inductance value. Furthermore, the structure is simple and reliable, allowing for dynamic adjustment of inductance parameters without complex circuit design.

[0009] Optionally, it also includes a magnetic core, which is simultaneously inserted through the first inductor and the second inductor. The magnetic core is externally fixed so that it can slide along the magnetic core axis.

[0010] Beneficial effects: The addition of a magnetic core structure, which passes through two inductor coils simultaneously and can slide axially, makes the inductance adjustment more sensitive. The axial sliding characteristic of the magnetic core further expands the inductance adjustment range. Fixing the magnetic core ensures the stability of the magnetic core during movement and avoids fluctuations in inductance value caused by the shaking of the magnetic core. The addition of the magnetic core also improves the energy conversion efficiency of the entire device and reduces leakage magnetic loss.

[0011] Optionally, it also includes a second drive mechanism adapted to move the magnetic core along the axial direction of the magnetic core.

[0012] Beneficial effects: The addition of a second driving mechanism to drive the magnetic core movement realizes a dual inductance adjustment mechanism. On the one hand, the mutual inductance can be changed by adjusting the relative position of the two coils through the first driving mechanism; on the other hand, the relative position of the first and second inductor coils can be changed by adjusting the position of the magnetic core through the second driving mechanism. This expands the range and flexibility of inductance adjustment. The two adjustment methods work together to achieve more precise inductance value control. By programmably controlling the two driving mechanisms, automated adjustment of inductance parameters can be achieved, improving the system's intelligence level.

[0013] Optionally, it also includes a connecting plate, which is fixedly connected to one end of the magnetic core.

[0014] Beneficial effects: The magnetic core is fixedly connected by the connecting plate, which provides reliable fixed support for the magnetic core and ensures the stability of the magnetic core during movement. The setting of the connecting plate simplifies the connection method between the magnetic core and the drive mechanism, making the overall structure more compact and reasonable. The connecting plate can be driven by the drive structure to change the relative position of the first inductor coil and the second inductor coil.

[0015] Optionally, the connecting plate blocks the side of the second inductor coil away from the first inductor coil.

[0016] Beneficial effects: The blocking effect of the connecting plate provides a mechanical limit to the movement of the second inductor coil, preventing it from exceeding the designed stroke and improving the safety of the device. At the same time, when the connecting plate moves, it can also push the second inductor coil closer to the first inductor coil to achieve the purpose of adjusting the inductance.

[0017] Optionally, the first drive mechanism is a rotary motor, and the first drive mechanism is connected to the first end of the second inductor coil through a transmission component.

[0018] Beneficial effects: The first drive mechanism uses a rotary motor in conjunction with a transmission component. The rotary motor has high control precision and fast response speed. The transmission component converts the rotational motion into linear motion, which not only maintains the control precision of the motor, but also meets the requirements of linear movement of the coil. At the same time, it is easy to realize digital control and can be integrated with modern control systems, providing a good foundation for realizing automated regulation.

[0019] Optionally, the transmission assembly includes: a first baffle, which is snapped and fixed to the first end of the second inductor coil;

[0020] The first guide rail is slidably connected to the first baffle. A slider is provided on the first guide rail and is fixedly connected to the first baffle. The slider slides along the extension direction of the first guide rail to limit the movement trajectory of the first baffle.

[0021] The transmission shaft and the sleeve are fixedly connected to the first baffle. The sleeve is fitted onto the transmission shaft. The outer circumferential surface of the transmission shaft is provided with an external thread, and the inner circumferential surface of the sleeve is provided with an internal thread. The external thread and the internal thread cooperate to convert the rotational motion of the rotary motor into the linear motion of the sleeve.

[0022] Beneficial effects: The transmission assembly includes components such as a first baffle, a first guide rail, a transmission shaft, and a sleeve. The snap-fit ​​fixing method between the first baffle and the inductor coil ensures the reliability of the connection and facilitates installation and disassembly. The cooperation between the first guide rail and the slider ensures the precise guidance of the moving parts and effectively prevents deviation and shaking during the movement. The threaded transmission mechanism converts rotary motion into linear motion, with high transmission accuracy and good self-locking performance.

[0023] Optionally, the first driving mechanism is a stepper motor, with the output shaft of the stepper motor fixed coaxially with the transmission shaft, so as to adjust the position of the second inductor coil by controlling the stepper motor.

[0024] Beneficial effects: Using a stepper motor as the drive source, the stepper motor has precise position control capabilities, enabling precise displacement adjustment. The stepper motor also has good low-speed performance, making it suitable for fine adjustment, thus providing a hardware foundation for the realization of intelligent adjustment systems.

[0025] Optionally, the second end of the second inductor is connected to a second baffle and a second guide rail. The second baffle is fixedly connected to the second end of the second inductor and slidably connected to the second guide rail.

[0026] Beneficial effects: The addition of a second baffle and a second guide rail at the other end of the second inductor coil improves the stability of the moving parts by providing double-end support and prevents the skew that may occur during single-sided driving. The addition of the second guide rail makes the movement smoother and more stable, reduces friction and wear, optimizes the force distribution, and extends the service life of the equipment. The double guide rail structure also provides a structural basis for the electrical conduction of the device.

[0027] Optionally, the second drive mechanism is a rotary motor. The outer circumferential surface of the drive end of the second drive mechanism is provided with an external thread, and the connecting plate is provided with an internal thread in the connecting hole corresponding to the drive end. The external thread and the internal thread cooperate to convert the rotational motion of the second drive mechanism into the linear motion of the connecting plate.

[0028] Beneficial effects: The use of a rotary motor in conjunction with a threaded drive ensures that the magnetic core position remains stable after adjustment. The internal thread of the connecting plate and the external thread of the drive end are matched to simplify the transmission method and make the structure more compact. It is worth mentioning that it can form a unified control strategy with the first drive mechanism, which facilitates the coordinated control of the two adjustment methods and creates favorable conditions for the development of a more intelligent inductance adjustment system. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the inductance adjustment device of this utility model;

[0031] Figure 2 This is a front view of the inductance adjustment device of this utility model;

[0032] Figure 3 This is a schematic diagram of the second drive mechanism of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. First inductor coil; 2. Second inductor coil; 3. First drive mechanism; 32. Drive shaft; 33. Sleeve; 34. First guide rail; 35. First baffle; 4. Second drive mechanism; 41. Second baffle; 42. Second guide rail; 5. Magnetic core; 6. Connecting plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0039] Mutual inductance is a form of electromagnetic induction where a change in current in one coil induces an electromotive force in a nearby coil. This phenomenon exists not only between coils wound on the same iron core but also applies to any circuit that is close to each other. Mutual inductance is widely used in electromagnetic induction technology to efficiently transfer energy or signals. The mutual inductance coefficient is a parameter that measures the strength of mutual inductance and depends on several factors, including the geometry, size, relative position, number of turns of the two coils, and the permeability of the surrounding medium. Based on this principle, transformers, induction coils, and other devices have been manufactured for voltage transformation, signal coupling, and other applications.

[0040] However, the coil spacing of traditional transformers is usually fixed, which means that the mutual inductance coefficient cannot be flexibly adjusted, and the output voltage can only vary according to a preset turns ratio. If the coil spacing needs to be changed to adapt to different needs, the transformer must be redesigned or replaced, which not only increases manufacturing costs but also reduces efficiency. This limitation restricts the transformer's dynamic adjustment capability, making it difficult to adapt to applications requiring flexible voltage or coupling adjustments.

[0041] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0042] According to an embodiment of the present invention, an inductance adjustment device is provided, comprising: a first inductor coil 1, a second inductor coil 2 and a first driving mechanism 3, wherein the first inductor coil 1 and the second inductor coil 2 are coaxially arranged; the driving end of the first driving mechanism 3 is connected to the second inductor coil 2 and is adapted to cause the second inductor coil 2 to move along the axial direction of the second inductor coil 2.

[0043] The first inductor coil 1 and the second inductor coil 2 are arranged coaxially, and the second coil is precisely moved axially using a first drive mechanism 3. The mutual inductance coefficient is changed by mechanically adjusting the relative axial position of the two coils. This overcomes the limitations of traditional fixed inductance or switch-type adjustment. The mechanically driven axial displacement method makes the inductance adjustment process continuous, enabling smooth gradient changes and fine parameter control. Compared to traditional methods such as electronic switch switching or tap switching, no additional complex control circuitry is required; the inductance parameters can be dynamically adjusted simply by changing the physical position, reducing system complexity and improving reliability. The coaxial arrangement ensures the symmetry and predictability of the magnetic field coupling, while the axial movement adjustment method provides a linear parameter change curve, making the inductance adjustment more intuitive and precise. The overall structure achieves high-performance adjustable inductance while maintaining the simplicity and maintainability of the mechanical structure.

[0044] In some embodiments, combined with Figure 1 As shown, the device also includes a magnetic core 5, which passes through both the first inductor coil 1 and the second inductor coil 2. The magnetic core 5 is externally fixed, allowing it to slide along its axial direction. The addition of the magnetic core 5, which passes through both inductor coils and can slide axially, makes inductance adjustment more sensitive. The axial sliding characteristic of the magnetic core 5 further expands the inductance adjustment range. Fixing the magnetic core 5 ensures stability during movement, preventing inductance fluctuations caused by core 5 shaking. The addition of the magnetic core 5 also improves the overall energy conversion efficiency of the device and reduces leakage flux loss.

[0045] The magnetic core 5 is made of a high-permeability material and runs through the inner cavities of both the first inductor coil 1 and the second inductor coil 2. The magnetic core 5 is fixed using a low-friction sliding bearing or linear guide to ensure its stability during movement and prevent inductance fluctuations caused by mechanical vibration or external impacts. Furthermore, the optimized design of the magnetic core 5 effectively reduces leakage flux loss and improves overall energy conversion efficiency. In certain high-precision applications, the surface of the magnetic core 5 can be coated with a wear-resistant insulating layer to reduce sliding friction and prevent eddy current losses.

[0046] In some embodiments, combined with Figure 1 and Figure 3As shown, it also includes a second drive mechanism 4, which is adapted to move the magnetic core 5 along its axial direction. The addition of the second drive mechanism 4 to drive the magnetic core 5 achieves a dual inductance adjustment mechanism. On one hand, the mutual inductance can be changed by adjusting the relative position of the two coils through the first drive mechanism 3; on the other hand, the relative position of the first inductor coil 1 and the second inductor coil 2 can be changed by adjusting the position of the magnetic core 5 through the second drive mechanism 4. This expands the range and flexibility of inductance adjustment. The two adjustment methods work together to achieve finer inductance value control. Through programmed control of the two drive mechanisms, automated adjustment of inductance parameters can be achieved, improving the system's intelligence level.

[0047] Furthermore, the connecting plate 6 is fixedly connected to one end of the magnetic core 5. The connecting plate 6 provides reliable support for the magnetic core 5, ensuring its stability during movement. The connecting plate 6 simplifies the connection between the magnetic core 5 and the drive mechanism, making the overall structure more compact and reasonable. The connecting plate 6 can be driven by the drive structure to change the relative positions of the first inductor coil 1 and the second inductor coil 2.

[0048] It is worth noting that the connecting plate 6 blocks the side of the second inductor coil 2 away from the first inductor coil 1. The blocking effect of the connecting plate 6 provides a mechanical limit to the movement of the second inductor coil 2, preventing it from exceeding its designed stroke and improving the safety of the device. At the same time, when the connecting plate 6 moves, it can also push the second inductor coil 2 closer to the first inductor coil 1 to achieve the purpose of adjusting the inductance. That is, when the connecting plate 6 is driven by the second driving mechanism 4, it can push or pull the magnetic core 5 to move, and at the same time, it can indirectly push the second inductor coil 2, making it move closer to or away from the first inductor coil 1, thereby achieving a more flexible inductance adjustment method.

[0049] Specifically, the second drive mechanism 4 is a rotary motor. The outer circumferential surface of the drive end of the second drive mechanism 4 is provided with an external thread, and the connecting plate 6 has an internal thread in the corresponding connecting hole of the drive end. The external thread and the internal thread cooperate to convert the rotational motion of the second drive mechanism 4 into the linear motion of the connecting plate 6. Using a rotary motor in conjunction with threaded transmission ensures that the position of the magnetic core 5 remains stable after adjustment. The cooperation between the internal thread of the connecting plate 6 and the external thread of the drive end simplifies the transmission method and makes the structure more compact. It is worth mentioning that this allows for a unified control strategy with the first drive mechanism 3, facilitating coordinated control of the two adjustment methods and creating favorable conditions for developing a more intelligent inductance adjustment system.

[0050] In some embodiments, combined with Figure 2As shown, the first drive mechanism 3 is a rotary motor, which is connected to the first end of the second inductor coil 2 via a transmission assembly. The first drive mechanism 3, through the rotary motor and the transmission assembly, utilizes the rotary motor's high control precision and fast response speed. The transmission assembly converts rotational motion into linear motion, maintaining the motor's control precision while meeting the requirements for linear coil movement. Furthermore, it facilitates digital control and integration with modern control systems, providing a solid foundation for automated regulation.

[0051] Furthermore, the transmission assembly includes: a first baffle 35, a first guide rail 34, a transmission shaft 32, and a sleeve 33. The first baffle 35 is snapped and fixed to the first end of the second inductor coil 2. The first baffle 35 is slidably connected to the first guide rail 34. A slider is provided on the first guide rail 34. The slider is fixedly connected to the first baffle 35. The slider slides along the extension direction of the first guide rail 34 to limit the movement trajectory of the first baffle 35. The sleeve 33 is fixedly connected to the first baffle 35. The sleeve 33 is sleeved on the transmission shaft 32. The outer circumferential surface of the transmission shaft 32 is provided with an external thread, and the inner circumferential surface of the sleeve 33 is provided with an internal thread. The external thread and the internal thread cooperate to convert the rotational motion of the rotary motor into the linear motion of the sleeve 33.

[0052] The transmission assembly includes components such as a first baffle 35, a first guide rail 34, a transmission shaft 32, and a sleeve 33. The snap-fit ​​fixing method between the first baffle 35 and the inductor coil ensures the reliability of the connection and facilitates installation and disassembly. The cooperation between the first guide rail 34 and the slider ensures the precise guidance of the moving parts and effectively prevents deviation and shaking during the movement. The threaded transmission mechanism converts rotary motion into linear motion, with high transmission accuracy and good self-locking performance.

[0053] The transmission components can also be ball screws, timing belts, or rack and pinion gears.

[0054] In one implementation, the first drive mechanism 3 is a stepper motor, with its output shaft coaxially fixed to the transmission shaft 32, allowing the position of the second inductor coil 2 to be adjusted by controlling the stepper motor. Using a stepper motor as the drive source provides precise position control capabilities, enabling accurate displacement adjustment. The stepper motor also exhibits good low-speed performance, making it suitable for fine-tuning, thus providing the hardware foundation for the implementation of an intelligent adjustment system.

[0055] In some embodiments, combined with Figure 3As shown, the second end of the second inductor coil 2 is connected to a second baffle 41 and a second guide rail 42. The second baffle 41 is fixedly connected to the second end of the second inductor coil 2, and the second baffle 41 is slidably connected to the second guide rail 42. The other end of the second inductor coil 2 is also equipped with a second baffle 41 and a second guide rail 42. This double-end support improves the stability of the moving parts and prevents skewness that may occur with unilateral drive. The addition of the second guide rail 42 makes the movement smoother and more stable, reduces friction and wear, optimizes force distribution, and extends the service life of the equipment. The double-guide rail structure also provides a structural basis for electrical conduction in the device.

[0056] As one feasible implementation, the first drive mechanism 3 and the second drive mechanism 4 use cylinders instead of rotary motors, with one end of the cylinder directly connected to the second inductor coil 2 and the connecting plate 6, respectively. By controlling the extension and retraction of the cylinder, precise axial displacement of the second inductor coil 2 and the shaft core is achieved. This eliminates mechanical transmission components, reduces frictional losses, and improves response speed.

[0057] The inductance adjustment device drives the second inductor coil 2 to move axially via the first drive mechanism 3, changing its relative position with the first inductor coil 1 to adjust the mutual inductance coefficient. When a magnetic core 5 is provided, the magnetic core 5 can be axially slid via the second drive mechanism 4, thus doubly adjusting the magnetic field coupling strength. In use, the rotation of the rotary motor is controlled, which is converted into linear motion via a threaded drive, controlling the coil spacing or the magnetic core position to achieve continuous adjustment of the inductance value. The device also supports automated control; the two drive systems can work independently or collaboratively, achieving dynamic adjustment of inductance parameters through programmed instructions.

[0058] In use, the first inductor coil 1 and the second inductor coil are connected to the circuit. By controlling the rotation of the first drive mechanism 3, the second inductor coil 2 is moved axially via a threaded drive, changing the relative position of the two coils to adjust the inductance value. If the device is equipped with a magnetic core 5, the magnetic core 5 can also be driven to slide axially via the second drive mechanism 4 to further finely adjust the magnetic field coupling strength. The user can precisely set the number of rotation steps or the stroke of the drive motor through an external controller to achieve continuous and stable adjustment of the inductance parameters. After adjustment, the system automatically maintains the set position.

[0059] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. An inductance adjustment device, characterized in that, include: A first inductor (1) and a second inductor (2) are arranged coaxially. The first driving mechanism (3) has its driving end connected to the second inductor coil (2) and is adapted to make the second inductor coil (2) move along the axial direction of the second inductor coil (2).

2. The inductance adjustment device according to claim 1, characterized in that, It also includes a magnetic core (5), which is simultaneously inserted through the first inductor coil (1) and the second inductor coil (2). The magnetic core (5) is externally fixed so that it slides along the axial direction of the magnetic core (5).

3. The inductance adjustment device according to claim 2, characterized in that, It also includes a second drive mechanism (4), which is adapted to move the magnetic core (5) along the axial direction of the magnetic core (5).

4. The inductance adjustment device according to claim 3, characterized in that, It also includes a connecting plate (6), which is fixedly connected to one end of the magnetic core (5).

5. The inductance adjustment device according to claim 4, characterized in that, The connecting plate (6) blocks the second inductor coil (2) on the side away from the first inductor coil (1).

6. The inductance adjustment device according to any one of claims 1-5, characterized in that, The first drive mechanism (3) is a rotary motor, and the first drive mechanism (3) is connected to the first end of the second inductor coil (2) through a transmission component.

7. The inductance adjustment device according to claim 6, characterized in that, The transmission assembly includes: The first baffle (35) is fixedly engaged with the first end of the second inductor coil (2); The first guide rail (34) is slidably connected to the first baffle (35). The first guide rail (34) is provided with a slider, which is fixedly connected to the first baffle (35). The slider slides along the extension direction of the first guide rail (34) to limit the movement trajectory of the first baffle (35). A drive shaft (32) and a sleeve (33) are provided. The sleeve (33) is fixedly connected to the first baffle (35). The sleeve (33) is sleeved on the drive shaft (32). The outer circumferential surface of the drive shaft (32) is provided with an external thread, and the inner circumferential surface of the sleeve (33) is provided with an internal thread. The external thread and the internal thread cooperate to convert the rotational motion of the rotary motor into the linear motion of the sleeve (33).

8. The inductance adjustment device according to claim 7, characterized in that, The first driving mechanism (3) is a stepper motor. The output shaft of the stepper motor is coaxially fixed with the transmission shaft (32) so as to adjust the position of the second inductor coil (2) by controlling the stepper motor.

9. The inductance adjustment device according to claim 6, characterized in that, The second end of the second inductor coil (2) is connected to a second baffle (41) and a second guide rail (42). The second baffle (41) is fixedly connected to the second end of the second inductor coil (2), and the second baffle (41) is slidably connected to the second guide rail (42).

10. The inductance adjustment device according to claim 4 or 5, characterized in that, The second drive mechanism (4) is a rotary motor. The outer circumferential surface of the drive end of the second drive mechanism (4) is provided with an external thread. The connecting plate (6) is provided with an internal thread in the connecting hole corresponding to the drive end. The external thread and the internal thread cooperate to convert the rotational motion of the second drive mechanism (4) into the linear motion of the connecting plate (6).

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