A tool for tightening SMA cable fastening nuts

Abstract

The application provides a tool for tightening SMA cable fastening nuts, which comprises a fixed plate, a first gear wheel arranged on the fixed plate and rotatable relative to the fixed plate, the first gear wheel being provided with a first accommodating cavity and a first opening, the first accommodating cavity being communicated with the first opening, the first accommodating cavity being shaped to match a nut for fixing the nut, and a driving assembly connected with the fixed plate, the driving assembly being used to drive the first gear wheel to rotate the nut. The application solves the problem that the operation of rotating the fastening nut is relatively complex when fastening the SMA cable.

Description

Technical Field

[0001] This invention relates to the field of cable tool technology, and in particular to a tool for tightening SMA cable fastening nuts. Background Technology

[0002] With the continuous development of the communications industry in recent years, in order to achieve stable signal transmission, my country typically uses Sub-Miniature-A (SMA) cables. In practical applications, SMA cables can also be called SMA antenna connectors or SMA reverse-polarity male connectors.

[0003] The ends of SMA cables typically include anchor nuts, clamping screws, and the cable body. When assembling SMA cables, the anchor nuts need to be tightened manually with a wrench to lock the cable body in place. However, SMA cables are usually tightly packed in confined spaces, and because existing wrenches are difficult to turn, it is often necessary to manually bend the wrench to rotate the anchor nuts.

[0004] Therefore, it can be seen that the existing technology has the problem that the operation of rotating the nut when tightening the cable is relatively complicated. Summary of the Invention

[0005] This invention provides a tool for tightening SMA cable fastening nuts, thereby solving the problem that the operation of rotating the fastening nut is relatively complicated when fastening SMA cables.

[0006] To achieve the above objectives, embodiments of the present invention provide a tool for tightening SMA cable fastening nuts, comprising:

[0007] A fixing plate is provided with a first gear, and the first gear is rotatable relative to the fixing plate; the first gear is provided with a first receiving cavity and a first opening, the first receiving cavity is connected to the first opening, and the shape of the first receiving cavity matches the nut for fixing the nut;

[0008] A drive assembly is connected to the fixed plate and is used to drive the first gear to rotate the nut.

[0009] Optionally, the fixing plate is further provided with a second gear, and the second gear is rotatable relative to the fixing plate, and the second gear meshes with the first gear;

[0010] The tool for tightening the SMA cable fastening nut also includes a drive shaft, one end of which is connected to the second gear and the other end of which is connected to the drive assembly. The drive shaft is used to drive the second gear to rotate the first gear under the action of the drive assembly.

[0011] Optionally, the fixing plate is further provided with:

[0012] The third gear is rotatable relative to the fixed plate; the third gear meshes with both the first gear and the second gear, and the contact position between the third gear and the first gear is the first contact point;

[0013] The fourth gear is rotatable relative to the fixed plate; the fourth gear meshes with both the first gear and the second gear; the contact position between the fourth gear and the first gear is the second contact point.

[0014] The circumferential angle between the first contact point and the second contact point relative to the rotation center of the first gear is the first circumferential angle; the circumferential angle between the first opening and the rotation center of the first gear is the second circumferential angle; wherein, the first circumferential angle is greater than the second circumferential angle.

[0015] Optionally, the fixing plate is further provided with a stop assembly, which is connected to the target gear and is used to limit the rotational stroke of the target gear from exceeding a preset value; wherein the target gear is any one of the first gear, the second gear, the third gear, and the fourth gear.

[0016] Optionally, the stop assembly includes a stop rod, a first end of which is connected to the fixed plate, and a second end of which is movable relative to the fixed plate.

[0017] When the rotational stroke of the target gear reaches the preset value, the second end of the stop bar is located at the target position and abuts against the target gear to restrict the rotation of the target gear.

[0018] Optionally, the stop assembly further includes an elastic element, one end of which is connected to the fixed plate and the other end of which is connected to the second end of the stop rod; the elastic element is used to drive the second end of the stop rod to move to the target position.

[0019] Optionally, the second gear includes:

[0020] Sub-gear, which meshes with both the third gear and the fourth gear;

[0021] A limiting member is provided, which is connected to the sub-gear; when the second end of the stop rod is located at the target position, the stop rod abuts against the limiting member to restrict the rotation of the sub-gear.

[0022] Optionally, the tool for tightening the SMA cable fastening nut further includes a torque detection component, which is electrically connected to the drive shaft and used to control the rotation of the drive shaft.

[0023] Optionally, the drive shaft and the second gear are detachably connected.

[0024] Optionally, the first gear is made of aluminum alloy.

[0025] In this embodiment, the first gear has a first receiving cavity and a first opening. The first receiving cavity communicates with the first opening, and the shape of the first receiving cavity matches the nut for fixing the nut. When the nut is located in the first receiving cavity, the first gear is driven to rotate by the driving component, thereby causing the nut to rotate. In specific implementation, the tightness of the nut can be adjusted by adjusting the rotation direction of the first gear. With the above configuration, when adjusting the tightness of the nut, only the first gear needs to be rotated, improving the convenience of rotating the nut. At the same time, driving the first gear to rotate by the driving component eliminates the need to manually rotate the first gear, further improving the convenience of rotating the nut and increasing the accuracy of adjusting the tightness of the nut. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the tool for tightening SMA cable fastening nuts provided in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0029] Figure 3 This is a schematic diagram of the structure of the fixing plate provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the SMA cable structure in an embodiment of the present invention;

[0031] Figure 5 It is along Figure 4 A cross-sectional view along the BB direction. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0034] like Figures 1-3 As shown, this embodiment of the invention provides a tool for tightening SMA cable fastening nuts, the tool comprising:

[0035] A fixing plate 10 is provided with a first gear 20, and the first gear 20 is rotatable relative to the fixing plate 10; the first gear 20 is provided with a first receiving cavity 201 and a first opening 202, the first receiving cavity 201 communicates with the first opening 202, and the shape of the first receiving cavity 201 matches the nut for fixing the nut;

[0036] A drive assembly 20 is connected to the fixed plate 10 and is used to drive the first gear 20 to rotate the nut.

[0037] It should be understood that the first gear 20 has a first receiving cavity 201 and a first opening 202. In some embodiments, the nut can enter the first receiving cavity 201 through the first opening 202. In this embodiment, the first opening 202 should be greater than the length of any side of the nut. In other embodiments, by adjusting the relative position of the first gear 20 and the nut so that the vertical projection of the nut on the first gear 20 is located within the first receiving cavity 201, and then moving the tool for tightening the SMA cable fastening nut, the nut is positioned within the first receiving cavity 201.

[0038] It should be understood that the structure of the fixing plate 10 is not limited herein. The fixing plate 10 is provided with a first gear 20, and the first gear 20 is rotatable relative to the fixing plate 10. In some embodiments, a portion of the outer surface of the fixing plate 10 is recessed inward to form a second receiving cavity and a second opening. The vertical projection of the first receiving cavity 201 on the fixing plate 10 is located within the second receiving cavity. When the first gear 20 rotates to a preset position, the vertical projection of the first opening 202 on the fixing plate 10 is located within the second opening. In other embodiments, the fixing plate 10 includes a plurality of sub-fixing plates 10, all of which are connected to the first gear 20, and the projections of the plurality of sub-fixing plates 10 on the first gear 20 are all located outside the first receiving cavity 201.

[0039] It should be understood that the specific structure of the drive component 20 is not limited herein. For example, in some embodiments, the drive component 20 is a pneumatic component. In other embodiments, the drive component 20 is an electric component.

[0040] It should be understood that the connection method between the drive assembly 20 and the fixing plate 10 is not limited here. For example, in some embodiments, the drive assembly 20 and the fixing plate 10 are detachably connected. In specific implementation, the shape of the first accommodating cavity 201 needs to match the nut, so different fixing plates 10 are required when adjusting the tightness of different nuts. This arrangement improves the ease of replacing the fixing plate 10 and enhances the flexibility of the tool used to tighten the SMA cable fastening nut. In other embodiments, the drive assembly 20 and the fixing plate 10 are welded together. This arrangement improves the connection stability of the drive assembly 20 and the fixing plate 10.

[0041] It should be understood that the material of the first gear 20 is not limited here. For example, optionally, in some embodiments, the first gear 20 is made of aluminum alloy. In this embodiment, since the first gear 20 is made of aluminum alloy, the impact on the nut can be reduced when the first gear 20 collides with the nut.

[0042] It should be understood that the structure of the fixing plate 10 is not limited here. For example, in some embodiments, the fixing plate 10 is made of aluminum alloy. In this embodiment, since the fixing plate 10 is made of aluminum alloy, the impact on other components can be reduced when the fixing plate 10 collides with other components.

[0043] In this embodiment, the first gear 20 is provided with a first receiving cavity 201 and a first opening 202. The first receiving cavity 201 communicates with the first opening 202. The shape of the first receiving cavity 201 matches the nut and is used to fix the nut. When the nut is located in the first receiving cavity 201, the first gear 20 is driven to rotate by the driving component 20, thereby driving the nut to rotate. In specific implementation, the tightness of the nut can be adjusted by adjusting the rotation direction of the first gear 20. With the above settings, when adjusting the tightness of the nut, only the first gear 20 needs to be rotated, which improves the convenience of rotating the nut. At the same time, the first gear 20 is driven to rotate by the driving component 20, eliminating the need to manually rotate the first gear 20, further improving the convenience of rotating the nut and improving the accuracy of adjusting the tightness of the nut.

[0044] Optionally, such as Figure 3 As shown, in some embodiments, the fixing plate 10 is further provided with a second gear 30, and the second gear 30 can rotate relative to the fixing plate 10, and the second gear 30 meshes with the first gear 20;

[0045] The tool for tightening the SMA cable fastening nut also includes a drive shaft, one end of which is connected to the second gear 30 and the other end is connected to the drive assembly 20. The drive shaft is used to drive the second gear 30 to rotate the first gear 20 under the action of the drive assembly 20.

[0046] It should be understood that the second gear 30 is connected to both the fixed plate 10 and the transmission shaft, and the second gear 30 is rotatable relative to the fixed plate 10. The connection method between the second gear 30 and the fixed plate 10 is not limited here.

[0047] It should be understood that the connection method between the second gear 30 and the drive shaft is not limited here. Optionally, in some embodiments, the drive shaft and the second gear 30 are detachably connected. This design improves the ease of separating the drive shaft from the second gear 30 when the fixing plate 10 needs to be replaced.

[0048] It should be understood that the first gear 20 is designed according to the specifications of different nuts, thereby adjusting the tightness of nuts of different specifications. In specific implementation, each size of the first gear 20 corresponds to a corresponding fixing plate 10. Therefore, when replacing the first gear 20, the fixing plate 10 is replaced as a whole. By replacing the fixing plate 10, the tool for tightening SMA cable fastening nuts provided in this embodiment can be easily disassembled and mounted on various types of equipment bodies.

[0049] It should be understood that the material of the drive shaft is not limited herein. For example, in some embodiments, the drive shaft is made of stainless steel. More specifically, the drive shaft is made of 304 stainless steel. Because 304 stainless steel has good machinability, high toughness, high temperature and corrosion resistance, and high rigidity, the above-mentioned design not only ensures the rigidity of the drive shaft but also extends its service life.

[0050] It should be understood that, in some embodiments, the tool for tightening the SMA cable fastening nut further includes a housing, and the protective housing and the drive shaft may also be referred to as an adapter. In this embodiment, the protective housing can be connected to the fixing plate 10. Furthermore, the housing and the fixing plate 10 are detachably connected.

[0051] In this embodiment, the fixing plate 10 is further provided with a second gear 30, and the tool for tightening the SMA cable fastening nut also includes a drive shaft. The drive assembly 20 drives the first gear 20 to rotate via the second gear 30 and the drive shaft. This arrangement reduces the impact of the drive assembly 20 directly driving the first gear 20.

[0052] Optionally, such as Figure 3 As shown, in some embodiments, the fixing plate 10 is further provided with:

[0053] The third gear 40 is rotatable relative to the fixed plate 10; the third gear 40 meshes with both the first gear 20 and the second gear 30, and the contact position between the third gear 40 and the first gear 20 is the first contact point;

[0054] The fourth gear 50 is rotatable relative to the fixed plate 10; the fourth gear 50 meshes with both the first gear 20 and the second gear 30; the contact position between the fourth gear 50 and the first gear 20 is the second contact point.

[0055] The distance between the first contact point and the second contact point relative to the rotation center of the first gear 20 is the first circumferential angle; the circumferential angle between the first opening 202 and the rotation center of the first gear 20 is the second circumferential angle; wherein, the first circumferential angle is greater than the second circumferential angle.

[0056] It should be understood that the fixing plate 10 is also provided with a third gear 40 and a fourth gear 50, and both the third gear 40 and the fourth gear 50 can rotate relative to the fixing plate 10. The connection method between the third gear 40 and the fourth gear 50 and the fixing plate 10 is not limited here.

[0057] It should be understood that the third gear 40 meshing with both the first gear 20 and the second gear 30 can be understood as the third gear 40 being located between the first gear 20 and the second gear 30, and meshing with the first gear 20 and the second gear 30 respectively.

[0058] It should be understood that the fourth gear 50 meshing with both the first gear 20 and the second gear 30 can be understood as the fourth gear 50 being located between the first gear 20 and the second gear 30, and meshing with the first gear 20 and the second gear 30 respectively.

[0059] In this embodiment, the fixing plate 10 is further provided with a third gear 40 and a fourth gear 50. The drive assembly 20 drives the second gear 30 to rotate via the transmission shaft. Since the third gear 40 and the fourth gear 50 mesh with the second gear 30 and also mesh with the first gear 20, the third gear 40 and the fourth gear 50 will rotate synchronously with the second gear 30, thereby driving the first gear 20 to rotate.

[0060] The first gear 20 has a first opening 202. When the first gear 20 rotates to the position where the first opening 202 corresponds to the third gear 40, the third gear 40 is not in contact with the first gear 20. Since the first circumferential angle is greater than the second circumferential angle, the fourth gear 50 contacts and meshes with the first gear 20 at this time, so the fourth gear 50 can push the first gear 20 to continue rotating. Similarly, when the first gear 20 rotates to the position where the first opening 202 corresponds to the fourth gear 50, the fourth gear 50 is not in contact with the first gear 20, and at this time the third gear 40 can push the first gear 20 to continue rotating.

[0061] In this embodiment, when the first gear 20 rotates, it is always in contact with at least one of the third gear 40 and the fourth gear 50. Through this arrangement, when the first gear 20 rotates to the point where the first opening 202 corresponds to either the third gear 40 or the fourth gear 50, the other gear can push the first gear 20 to continue rotating, ensuring the rotational continuity of the first gear 20.

[0062] Optionally, in some embodiments, the fixing plate 10 is further provided with a stop assembly 60, which is connected to the target gear and is used to limit the rotational stroke of the target gear from exceeding a preset value; wherein the target gear is any one of the first gear 20, the second gear 30, the third gear 40 and the fourth gear 50.

[0063] It should be understood that the target gear is any one of the first gear 20, the second gear 30, the third gear 40, and the fourth gear 50. In some embodiments, the target gear may also be at least one of the first gear 20, the second gear 30, the third gear 40, and the fourth gear 50.

[0064] It should be understood that the first gear 20 meshes with both the third gear 40 and the fourth gear 50, and both the third gear 40 and the fourth gear 50 mesh with the second gear 30. When the target gear stops rotating, it restricts the rotation of the gears meshing with the target gear, thereby achieving the purpose of restricting the rotation of the first gear 20.

[0065] It should be understood that the stop component 60, used to limit the rotational stroke of the target gear from exceeding a preset value, means that when the rotational stroke of the target gear along a preset direction reaches the preset value, the stop component 60 will limit the target gear from continuing to rotate. The preset value can be adjusted according to actual needs.

[0066] It should be understood that the structure of the stop assembly 60 is not limited herein. Optionally, in some embodiments, the stop assembly 60 includes a stop rod 601, the first end of which is connected to the fixing plate 10, and the second end of which is movable relative to the fixing plate 10.

[0067] When the rotational stroke of the target gear reaches the preset value, the second end of the stop bar 601 is located at the target position and abuts against the target gear to restrict the rotation of the target gear.

[0068] It should be understood that when the rotational stroke of the target gear reaches a preset value, the second end of the stop rod 601 is located at the target position and abuts against the target gear. When the rotational stroke of the target gear does not reach the preset value, the second end of the stop rod 601 is located at a position other than the target position, and the target gear can rotate normally.

[0069] It should be understood that the specific manner in which the second end of the stop rod 601 moves relative to the fixed plate 10 is not limited here. Optionally, in some embodiments, the stop assembly 60 further includes an elastic member 602, one end of which is connected to the fixed plate 10, and the other end of which is connected to the second end of the stop rod 601; the elastic member 602 is used to drive the second end of the stop rod 601 to move to the target position.

[0070] It should be understood that the elastic element 602 driving the second end of the stop rod 601 to move to the target position can be understood as follows: when the rotational stroke of the target gear has not reached the preset value, the elastic element 602 is in a stretched or compressed state and applies a force to the second end of the stop rod 601 to push the second end of the stop rod 601 to move to the target position. The setting of the target position is not limited here.

[0071] Optionally, in some embodiments, the second gear 30 includes:

[0072] Sub-gear 301, which meshes with both the third gear 40 and the fourth gear 50;

[0073] The limiting member 302 is connected to the sub-gear 301; when the second end of the stop rod 601 is located at the target position, the stop rod 601 abuts against the limiting member 302 to restrict the rotation of the sub-gear 301.

[0074] It should be understood that the specific connection method between the limiting member 302 and the sub-gear 301 is not limited here. For example, in some embodiments, the limiting member 302 and the sub-gear 301 are integrally formed. In other embodiments, the limiting member 302 and the sub-gear 301 are welded together.

[0075] It should be understood that when the sub-gear 301 rotates, the limiting member 302 also rotates synchronously. Therefore, when the stop rod 601 abuts against the limiting member 302, the stop rod 601 can limit the rotation of the sub-gear 301 by limiting the rotation of the limiting member 302.

[0076] It should be understood that, in this embodiment, the drive shaft can be connected to at least one of the sub-gear 301 and the limiting member 302. The connection method between the drive shaft and the sub-gear 301 is not limited here. The connection method between the drive shaft and the limiting member 302 is not limited here.

[0077] The following is based on Figure 3 The movement of the stop rod 601 will be explained using an example. Figure 3 As shown, let the target gear be the second gear 30, so that... Figure 3The position of the second gear 30 is the starting point, and the preset value of the rotational stroke is one counterclockwise rotation. When the second gear 30 rotates clockwise, the limiting member 302 pushes the stop rod 601 to move away from the second gear 30. The stop rod 601 compresses the elastic member 602, and the clockwise rotation of the second gear 30 is not restricted by the stop rod 601. When the second gear 30 rotates counterclockwise, the stop rod 601 moves to the target position under the push of the elastic member 602. In this embodiment, the second end of the stop rod 601 being located at the target position can be understood as the stop rod 601 being horizontally set. At this time, the limiting member 302 abuts against the stop rod 601, and the limiting member 302 cannot continue to rotate, thereby causing the second gear 30 to stop rotating.

[0078] In this embodiment, the second gear 30 includes a sub-gear 301 and a limiting member 302. When the second end of the stop rod 601 is located at the target position, the stop rod 601 abuts against the limiting member 302 to restrict the rotation of the sub-gear 301, thereby preventing the first gear 20 from rotating. Through this arrangement, the stop rod 601 only contacts the limiting member 302, thus reducing the influence of the stop rod 601 on the rotation of the sub-gear 301.

[0079] Optionally, in some embodiments, the tool for tightening the SMA cable fastening nut further includes a torque detection component electrically connected to the drive shaft for controlling the rotation of the drive shaft.

[0080] In this embodiment, the torque detection component is used to control the rotation of the transmission shaft. This can be understood as the torque detection component being used to detect the tightening torque. When the tightening torque reaches a preset torque value, the torque detection component can control the transmission shaft to stop rotating, thereby controlling the first gear 20 to stop rotating.

[0081] It should be understood that, in some embodiments, the torque detection assembly includes an electrically connected detection element and a controller. The detection element detects the tightening torque and sends the detected tightening torque to the controller, which can then control the rotation of the drive shaft based on the tightening torque. Furthermore, the torque detection assembly also includes a display device electrically connected to the controller, which displays the tightening torque. In specific implementations, the controller can automatically record and save the nut tightening information, forming a file that can be viewed on the system display and exported as tabular data.

[0082] In this embodiment, the tool for tightening the SMA cable fastening nut also includes a torque detection component. By setting the torque detection component, the tightening torque can be monitored in real time, improving the accuracy of adjusting the tightness of the nut.

[0083] The tool for tightening SMA cable fastening nuts provided in this embodiment can be used to remove nuts, install nuts, or adjust the tightness of nuts. The following will use an SMA cable as an example to describe the specific process of using the tool for tightening SMA cable fastening nuts provided in this embodiment to tighten an SMA cable. A structural diagram of the SMA cable in this embodiment can be found in [reference needed]. Figure 4 and Figure 5 In this embodiment, using the tool for tightening the SMA cable fastening nut to fasten the SMA cable can be understood as using the tool for tightening the SMA cable fastening nut to tighten the anchor nut 1 of the SMA cable, thereby fastening the SMA cable body 2. Typically, the diameter of the SMA cable body 2 is smaller than the diameter of the anchor nut 1.

[0084] In actual use, the user first adjusts the position of the tool used to tighten the SMA cable fastening nut so that the SMA cable body 2 passes through the first opening 202 and is located within the first receiving cavity 201. Then, the user moves the tool towards the anchor nut 1 so that the anchor nut 1 is located within the first receiving cavity 201. After securing the anchor nut 1, the user can start the drive assembly 20 to rotate clockwise. The drive assembly 20 drives the second gear 30 to rotate via the transmission shaft, and the second gear 30 pushes the first gear 20 to rotate clockwise via the third gear 40 and the fourth gear 50. During the rotation of the first gear 20, the anchor nut 1 rotates, thereby tightening the anchor nut 1. The detection element can detect the tightening torque and transmit the detected tightening torque to the controller. When the tightening torque reaches a preset torque value, the controller controls the transmission shaft to stop rotating, thereby stopping the first gear 20 from rotating. At this point, the anchor nut 1 can be considered tightened.

[0085] Because SMA cables are typically tightly packed, the first gear 20 needs to be rotated to its initial position to remove the tool used to tighten the SMA cable fastening nut. At this point, the user moves the tool, moving the first gear 20 towards the SMA cable body 2. This prevents the first gear 20 from contacting the anchor nut 1. Then, the drive assembly 20 is activated to reverse, causing the first gear 20 to rotate counter-clockwise. Because the stop bar 601 is provided in this embodiment, the counter-clockwise rotation stroke of the first gear 20 is less than one revolution, preventing the first gear 20 from spinning freely for multiple revolutions. After the first gear 20 rotates to the initial position, the user can remove the tool used to tighten the SMA cable fastening nut. In this embodiment, the initial position is the position of the first gear 20 when the user allows the SMA cable body 2 to pass through the first opening 202 and be located within the first receiving cavity 201.

[0086] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tool for tightening SMA cable fastening nuts, characterized in that, include: A fixing plate, wherein a first gear is provided on the fixing plate and the first gear is rotatable relative to the fixing plate; The first gear has a first receiving cavity and a first opening, the first receiving cavity is in communication with the first opening, and the shape of the first receiving cavity matches the nut for fixing the nut; A drive assembly is connected to the fixed plate and is used to drive the first gear to rotate the nut. The fixing plate is also provided with a second gear, and the second gear can rotate relative to the fixing plate; The tool for tightening the SMA cable fastening nut also includes a drive shaft, one end of which is connected to the second gear and the other end of which is connected to the drive assembly. The drive shaft is used to drive the second gear to rotate the first gear under the action of the drive assembly. The fixing plate is also provided with: A third gear, which is rotatable relative to the fixed plate; The third gear meshes with both the first gear and the second gear, and the contact position between the third gear and the first gear is the first contact point; A fourth gear, which is rotatable relative to the fixed plate; The fourth gear meshes with both the first gear and the second gear; The contact point between the fourth gear and the first gear is the second contact point; The circumferential angle between the first contact point and the second contact point relative to the rotation center of the first gear is the first circumferential angle; the circumferential angle between the first opening and the rotation center of the first gear is the second circumferential angle; wherein, the first circumferential angle is greater than the second circumferential angle; The fixed plate is also provided with a stop assembly, which is connected to the target gear and is used to limit the rotational stroke of the target gear from exceeding a preset value; wherein, the target gear is any one of the first gear, the second gear, the third gear, and the fourth gear; The stop assembly includes a stop rod, the first end of which is connected to the fixed plate, and the second end of which is movable relative to the fixed plate. When the rotational stroke of the target gear reaches the preset value, the second end of the stop bar is located at the target position and abuts against the target gear to restrict the rotation of the target gear.

2. The tool for tightening SMA cable fastening nuts according to claim 1, characterized in that, The stop assembly further includes an elastic element, one end of which is connected to the fixed plate and the other end of which is connected to the second end of the stop rod; the elastic element is used to drive the second end of the stop rod to move to the target position.

3. The tool for tightening SMA cable fastening nuts according to claim 1, characterized in that, The second gear includes: Sub-gear, which meshes with both the third gear and the fourth gear; A limiting member is provided, which is connected to the sub-gear; when the second end of the stop rod is located at the target position, the stop rod abuts against the limiting member to restrict the rotation of the sub-gear.

4. The tool for tightening SMA cable fastening nuts according to claim 1, characterized in that, The tool for tightening the SMA cable fastening nut also includes a torque detection component, which is electrically connected to the drive shaft and used to control the rotation of the drive shaft.

5. The tool for tightening SMA cable fastening nuts according to any one of claims 1-4, characterized in that, The drive shaft and the second gear are detachably connected.

6. The tool for tightening SMA cable fastening nuts according to any one of claims 1-4, characterized in that, The first gear is made of aluminum alloy.

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