Phase-shifting transmission assembly and frequency-selective phase-shifting device

Abstract

The utility model provides a kind of phase-shifting transmission assembly and frequency-selecting phase-shifting device, the phase-shifting transmission assembly includes phase-shifting piece and worm, rack is equipped on the phase-shifting piece, the worm is engaged with the rack, one end of the length direction of the phase-shifting piece is used to be connected with the phase-shifting component of phase shifter, the worm is used to receive external rotating torque and rotate, to drive the rack and drive the phase-shifting component linear motion along the length direction to implement phase shifting. The phase-shifting transmission assembly is based on rack and worm cooperation transmission, the rack is connected with the phase-shifting component of phase shifter, worm is driven to rotate by worm, to drive phase-shifting component to move by the rack, to realize phase shifting. And, rack and worm cooperation transmission has the advantages of high precision and low cost.

Description

Technical Field

[0001] This utility model belongs to the field of mobile communication technology, specifically relating to a phase shifting transmission component and a frequency selective phase shifting device configured with the phase shifting transmission component. Background Technology

[0002] In the field of wireless communication, the performance optimization of antenna systems is crucial to network coverage quality. The antenna transmission mechanism, as a core component, is mainly used to control phase adjustment components such as phase shifters. By achieving dynamic phase changes, it rapidly adjusts the antenna radiation pattern to meet network coverage requirements in complex scenarios. Currently, in mainstream technical solutions, the output end of the transmission mechanism typically uses a screw mechanism or a rack and pinion mechanism connected to the phase shifting component of the phase shifter. This mechanical transmission drives the phase shifting component to move linearly, thereby achieving phase adjustment. However, both of these technical solutions have significant drawbacks in practical applications, for the following reasons: Screw mechanisms, as a traditional transmission method, typically include components such as a screw, nut, clamp, guide rod, and front and rear support seats. While this approach can achieve stable linear transmission, it suffers from the following problems: Firstly, it requires clamps, guide rods, and multiple sets of support components, resulting in a large number of parts, complex assembly processes, and significantly increased manufacturing costs. Secondly, auxiliary structures such as clamps and guide rods occupy additional space, and the space requirement increases with the number of antenna operating frequency bands. This directly conflicts with the urgent need for miniaturization and integration of antenna equipment in current 5G / 6G communications.

[0003] Due to its compact structure and convenient installation, the gear and rack mechanism has gradually become a mainstream alternative in recent years. However, this technology still has the following problems: to avoid jamming when the gear and rack mesh, a tooth flank clearance needs to be reserved. But in high-frequency reciprocating transmission scenarios, the clearance will cause backlash error during reverse transmission, resulting in a decrease in phase adjustment accuracy.

[0004] Therefore, existing antenna transmission mechanisms have significant technical deficiencies in terms of transmission accuracy, structural compactness, and cost control. There is an urgent need for a transmission solution that combines high precision, miniaturization, and low cost to support the technological upgrade requirements of next-generation communication antennas. Utility Model Content

[0005] The primary objective of this invention is to solve at least one of the aforementioned problems by providing a phase-shifting transmission component and a frequency-selective phase-shifting device.

[0006] To achieve the various objectives of this utility model, the following technical solution is adopted: To achieve one of the objectives of this utility model, a phase-shifting transmission assembly is provided, comprising a phase-shifting component and a worm gear. The phase-shifting component is provided with a rack, and the worm gear meshes with the rack. One end of the phase-shifting component in the length direction is used to connect to the phase-shifting component of the phase shifter. The worm gear is used to receive external torque and rotate, thereby driving the rack to drive the phase-shifting component to move linearly along the length direction to implement phase shifting.

[0007] In one embodiment, the phase-shifting transmission assembly further includes a stop assembly, which includes a first stop member disposed on the worm gear and a second stop member disposed on one or both ends of the rack along its length direction, wherein the first stop member and the second stop member contact each other to stop.

[0008] In one embodiment, the first stop is disposed in one segment of the extension path of the thread groove of the external thread of the worm, and the second stop is disposed in the tooth groove at the end of the rack in the length direction.

[0009] In one embodiment, the first stop protrudes from the bottom of the threaded groove, and the second stop protrudes from the bottom of the toothed groove.

[0010] In one embodiment, the first stop is integrally formed with the worm gear, and the second stop is integrally formed with the rack.

[0011] In one embodiment, the first stop includes a stop ring, the second stop includes a pusher, the worm gear has a protruding insertion shaft at one end in the length direction, the stop ring is sleeved on the insertion shaft, the stop ring has a protruding stop block at the end opposite to the insertion shaft, the pusher is disposed at one end of the rack in the length direction, the pusher can abut against the stop ring, so as to push the stop block to abut against the external thread of the worm gear via the stop ring.

[0012] In one embodiment, the first stop further includes a spring, the stop ring has an inner groove, the opening of the inner groove faces the insertion shaft, the spring is installed in the inner groove and sleeved on the insertion shaft, and the pusher is used to apply a force to the stop ring to compress the spring, so that after the stop ring moves, the stop block abuts against the external thread.

[0013] In one embodiment, a mounting groove is provided at one end of the rack along its length, the pusher is installed in the mounting groove, and the pusher protrudes from the opening of the mounting groove, and the pusher can abut against the stop ring.

[0014] In one embodiment, the phase-shifting transmission assembly further includes an input gear and an output gear. The output gear is disposed on the worm, and the input gear is connected to the output gear in a transmission manner. The input gear is used to receive external torque so as to drive the worm to rotate via the output gear.

[0015] In one embodiment, the phase-shifting transmission assembly further includes a mounting box, in which the worm gear is mounted, and the mounting box also has a moving channel through which the rack passes.

[0016] To achieve one of the objectives of this utility model, a frequency-selective phase-shifting device is provided, comprising a frequency-selective module, a phase-shifting module, and a plurality of phase-shifting transmission components as described in any one of the preceding objectives. The plurality of phase-shifting transmission components are respectively applied to and connected to a plurality of external phase-shifting components. The plurality of phase-shifting transmission components are arranged in one row or two rows along the same axis. The frequency-selective module is used to select one of the phase-shifting transmission components, and the phase-shifting module is used to drive the worm gear of the selected phase-shifting transmission component to rotate, so as to correspondingly drive the connected phase-shifting component to move and implement phase shifting.

[0017] Compared with the prior art, this utility model has many advantages, including but not limited to: This utility model discloses a phase-shifting transmission assembly. By incorporating a rack on the phase-shifting component and engaging a worm gear with it, the worm gear rotates upon receiving external torque. Based on the meshing relationship between the worm and rack, the rotational motion is converted into the linear motion of the rack. One end of the phase-shifting component is connected to the phase-shifting part of the phase shifter, allowing the linear motion of the rack to directly drive the phase-shifting part to move along its length, thus smoothly implementing the phase-shifting operation. This transmission method is direct and reliable, ensuring that the phase-shifting part moves according to a predetermined trajectory and speed, meeting the basic requirements of the phase shifter for its transmission function, and providing a solid structural foundation for the normal operation of the phase shifter.

[0018] The rack and pinion gear combination offers significant advantages in transmission accuracy. Specifically, worm gear drives are characterized by accurate transmission ratios, smooth operation, and noiselessness. The precise meshing of the worm and rack ensures that each rotation is accurately converted into a linear movement of a specific distance on the rack. This precise transmission relationship guarantees the accuracy of the phase-shifting component's movement distance, thereby achieving high-precision phase-shifting operations.

[0019] The described phase-shifting transmission assembly has a simple and clear structure, reducing unnecessary parts and complex assembly processes, thus lowering assembly difficulty and labor costs. At the same time, the lower production cost makes this phase-shifting transmission assembly more competitive in price, meeting the cost requirements of different customer groups and providing feasibility and economic assurance for its large-scale application in the industry. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a three-dimensional schematic diagram of the phase-shifting transmission component according to the first embodiment of this utility model.

[0021] Figure 2 This is a schematic diagram of the phase-shifting transmission assembly according to the first embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the phase-shifting component of the phase-shifting transmission assembly according to the first embodiment of this utility model.

[0023] Figure 4 This is a schematic diagram of the worm gear structure of the phase-shifting transmission assembly according to the first embodiment of this utility model.

[0024] Figure 5 This is a schematic diagram of the phase-shifting transmission assembly according to the second embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the phase-shifting transmission assembly (stop ring not shown) according to the second embodiment of this utility model.

[0026] Figure 7 This is a schematic diagram of the worm gear structure of the phase-shifting transmission assembly according to the second embodiment of this utility model.

[0027] Figure 8 This is a schematic diagram from a first perspective of the stop member of the phase-shifting transmission assembly according to the second embodiment of the present invention.

[0028] Figure 9 This is a schematic diagram from a second perspective of the stop member of the phase-shifting transmission assembly according to the second embodiment of the present invention.

[0029] Figure 10 This is a schematic diagram of the phase-shifting component of the phase-shifting transmission assembly according to the second embodiment of this utility model.

[0030] Figure 11 for Figure 10 An enlarged schematic diagram of part A.

[0031] Figure 12 This is a schematic diagram of the pusher component of the phase-shifting transmission assembly according to the second embodiment of the present invention. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model and should not be construed as limiting this utility model.

[0033] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or components, nor does it exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0035] This invention provides a phase-shifting transmission assembly based on a rack and worm gear transmission. The rack is connected to the phase-shifting component of the phase shifter. The worm gear drives the worm to rotate, which in turn moves the phase-shifting component via the rack, thus achieving phase shifting. Furthermore, the rack and worm gear transmission offers advantages in terms of high precision and low cost.

[0036] In a typical embodiment of this utility model, combined with Figure 1 and Figure 2 or Figure 5The phase-shifting transmission assembly 100 includes a phase-shifting component 110 and a worm gear 120. The phase-shifting component 110 includes a base plate 111 and a rack 112. The rack 112 is disposed on the base plate 111, and one end of the base plate 111 is connected to the phase-shifting component of the phase shifter along the length of the rack 112. In this embodiment, it is recommended that the rack 112 and the base plate 111 be integrally formed, but this should not be construed as limiting the present invention.

[0037] The worm gear 120 meshes with the rack 112. The worm gear 120 is configured to receive an externally applied driving torque and rotate around its own axis, thereby driving the rack 112 to move linearly along its length. During the linear movement of the rack 112, it drives the base plate 111 to move along a linear direction, which in turn drives the phase-shifting component to move linearly, ultimately realizing the phase-shifting operation.

[0038] The phase-shifting transmission assembly 100 further includes an input gear 130 and an output gear 140. The output gear 140 is fixedly disposed at one end of the worm gear 120 along its length. The input gear 130 and the output gear 140 can be directly meshed for transmission, or they can be connected via a gear train. The input gear 130 receives externally applied torque and transmits it to the output gear 140, thereby driving the output gear 140 to rotate, ultimately driving the worm gear 120 to rotate synchronously. In this embodiment, it is recommended that the output gear 140 and the worm gear 120 be integrally formed, but this should not be construed as a limitation of the present invention. In one embodiment, both the input gear 130 and the output gear 140 are bevel gears, and they transmit power through direct meshing.

[0039] The phase-shifting transmission assembly 100 is further provided with a stopping assembly, which consists of a first stopping member 150 and one or two second stopping members 160. The first stopping member 150 is fixedly installed on the worm gear 120; the second stopping members 160 are configured such that one second stopping member 160 is provided at one end of the rack 112, or both ends of the rack 112 are provided with second stopping members 160. When the worm gear 120 drives the rack 112 to perform linear motion, and the end 1221 of the rack 112 moves to a position where it meshes with the worm gear 120, the first stopping member 150 and the second stopping members 160 will come into contact with each other and generate a stopping effect, thereby effectively preventing the rack 112 from separating from the worm gear 120 and ensuring that the phase-shifting transmission assembly 100 always maintains a stable structural state.

[0040] In the first embodiment of this utility model, combined with Figures 2 to 4 The worm gear 120 includes a rod body 121 and an external thread 122 disposed on the rod body 121. The rod body 121 and the external thread 122 cooperate to form the worm gear 120. The external thread 122 extends helically along the axial direction of the rod body 121 to form a threaded groove 123, and the threaded groove 123 also extends helically along the axial direction of the rod body 121.

[0041] The first stop 150 is disposed within the threaded groove 123, and the first stop 150 protrudes relative to the bottom of the threaded groove 123. The first stop 150 has a block-like structure, and its shape can be, for example, cubic, hemispherical, or semi-ellipsoidal. In this embodiment, it is recommended that the first stop 150 and the worm gear 120 be integrally formed, but this should not be construed as a limitation of the present invention. In one embodiment, both ends of the first stop 150 are connected to the two side walls of the threaded groove 123, thereby improving the stability of the overall structure.

[0042] The stopping assembly includes two second stop members 160, which are respectively disposed at both ends of the rack 112 along its length. Specifically, a tooth groove 1121 is formed between two adjacent teeth on the rack 112. The tooth groove 1121 located at the end of the rack 112 along its length is called the end tooth groove 1122. The rack 112 has two end tooth grooves 1122 along its length. The two second stop members 160 are respectively disposed in these two end tooth grooves 1122, that is, each end tooth groove 1122 is provided with a second stop member 160. The second stop member 160 protrudes from the bottom of the tooth groove 1121.

[0043] The second stop 160 has a block-like structure, and its shape can be, for example, cubic, hemispherical, or semi-ellipsoidal. In this embodiment, it is recommended that the second stop 160 and the rack 112 be integrally formed, but this should not be construed as a limitation of the present invention.

[0044] When the worm gear 120 is driven to rotate, it drives the rack 112 to move linearly. When one end of the rack 112 moves to the position of the worm gear 120, the first stop 150 provided in the threaded groove 123 engages with the second stop 160 located in the end tooth groove 1122, thereby stopping the worm gear 120 and the rack 112, preventing the worm gear 120 from disengaging from the rack 112, and improving the transmission stability of the phase-shifting transmission assembly 100.

[0045] Therefore, when the worm gear 120 drives the rack 112 to perform forward or reverse linear motion, and both ends of the rack 112 move to the position of the worm gear 120, the second stop 160 at each end of the rack 112 cooperates with the first stop 150 on the worm gear 120 to achieve stop, so that the worm gear 120 will not disengage from the rack 112 regardless of whether the rack 112 performs forward or reverse linear motion, thereby effectively improving the structural stability of the phase-shifting transmission assembly 100.

[0046] In the second embodiment of this utility model, combined with Figure 7 The worm gear 120 has a connector shaft 124 at one end in its length direction. The connector shaft 124 extends along the length direction of the worm gear 120, and the connector shaft 124 and the output gear 140 are respectively located at both ends in the length direction of the worm gear 120.

[0047] The first stop 150 includes a stop ring 151 and a spring 152. (Combined) Figure 8 and Figure 9 The stop ring 151 has an inner groove 1513 extending along the length direction, and a through hole 1511 at the bottom of the groove. Furthermore, the stop ring 151 has a stop block 1514 protruding from it along the length direction, and the stop block 1514 is positioned opposite the insertion shaft 124.

[0048] The stop ring 151 is sleeved on the insertion shaft 124, that is, the insertion shaft 124 is inserted into the inner groove 1513, or the insertion shaft 124 passes through the through hole 1511 on the bottom of the inner groove 1513. The spring 152 is installed in the inner groove 1513 and is simultaneously sleeved on the insertion shaft 124. Under the blocking action of the bottom of the inner groove 1513, the spring 152 will not come out of the inner groove 1513. The stop block 1514 is set closer to the worm gear 120 than the first end (that is, the end where the bottom of the inner groove 1513 is located). When subjected to external force, the stop block 1514 can abut against the external thread 122 of the worm gear 120, thereby preventing the worm gear 120 from rotating. In one embodiment, the worm gear 120 is also provided with a corresponding spring groove 125, and the spring 152 is sleeved on the plug shaft 124 and also installed in the spring groove 125 to facilitate the constraint of the spring 152.

[0049] In this embodiment, when the spring 152 is in a stretched state, i.e., not subjected to external force, under the influence of the elastic force of the spring 152 itself, the spring 152 will exert a force on the bottom of the inner groove 1513 to drive the stop ring 151 to move away from the worm 120, so that the stop block 1514 does not abut against the external thread 122 of the worm 120, and the worm 120 can rotate freely at this time.

[0050] Combination Figures 10 to 12 The second stop 160 includes a pusher 161, which is disposed at one end of the rack 112 along its length. When the worm gear 120 drives the rack 112 to move linearly in the direction of the pusher 161, if the pusher 161 on the rack 112 abuts against the first end of the stop ring 151, the pusher 161 will apply a force to the spring 152 through the first end of the stop ring 151, causing the spring 152 to be compressed, thereby causing the stop ring 151 to move closer to the worm gear 120. It can be understood that the stop ring 151 will simultaneously drive the stop block 1514 to move towards the worm gear 120, ultimately causing the stop block 1514 to abut against the external thread 122 of the worm gear 120, thereby limiting the rotation of the worm gear 120.

[0051] In this embodiment, combined with Figure 12 and Figure 9 The pushing member 161 has a pushing surface 1611, and the stop ring 151 has a force-receiving surface 1516. The force-receiving surface 1516 is formed on the first end of the stop ring 151, and the pushing surface 1611 and the force-receiving surface 1516 are disposed opposite to each other. The pushing surface 1611 contacts the force-receiving surface 1516 so that the pushing member 161 can apply a force to the stop ring 151, thereby compressing the spring 152.

[0052] In one embodiment, combined Figure 9 and Figure 7 The stop block 1514 has a stop surface 1515 formed on one side, and the worm gear 120 has an end face 1222 formed at one end of the external thread 122. When the stop block 1514 abuts against the end 1221 of the external thread 122, the stop surface 1515 and the end face 1222 engage with each other, thereby restricting the rotation of the worm gear 120.

[0053] In one embodiment, combined Figure 11 and Figure 12The rack 112 has a groove (not shown), and the pusher 161 is installed in the groove, protruding from the groove so that the pusher 161 abuts against the stop block 1514. In another embodiment, the pusher 161 and the rack 112 are integrally formed.

[0054] In the second embodiment, by driving the worm gear 120 to rotate in the opposite direction, the stop block 1514 no longer obstructs the rotation of the external thread 122. At this time, the worm gear 120 can drive the rack 112 to move in the opposite direction, thereby separating the stop block 1514 from the external thread 122. As the stop block 1514 separates from the external thread 122, the force on the spring 152 decreases, and the spring 152 gradually changes from a compressed state to a relaxed state, thereby allowing the stop ring 151 to rotate freely.

[0055] Therefore, by cooperating with the first stop 150 and the second stop 160, the worm gear 120 can be effectively prevented from disengaging from the rack 112, significantly improving the structural stability of the phase-shifting transmission assembly 100.

[0056] In a typical embodiment of this utility model, combined with Figure 1 The phase-shifting transmission assembly 100 also includes a mounting box 170, in which the worm gear 120 and the output gear 140 are both mounted. The mounting box 170 provides positioning and constraint for the worm gear 120 and the output gear 140. Simultaneously, a moving channel 1722 is provided within the mounting box 170, through which the rack 112 passes, facilitating meshing and transmission between the rack 112 and the worm gear 120.

[0057] Specifically, the mounting box 170 includes an upper shell 171 and a lower shell 172. The lower shell 172 has two mounting slots (not shown), and the upper shell 171 has two mating slots (not shown) corresponding to the two mounting slots. The mounting slots and their corresponding mating slots cooperate to form two mounting cavities, in which the worm gear 120 and the output gear 140 are respectively disposed. Furthermore, the moving channel 1722 is formed on the lower shell 172.

[0058] This utility model also provides a frequency-selective phase-shifting device, which includes a frequency selection module, a phase-shifting module, and multiple phase-shifting transmission components 100 as described above. Each of the multiple phase-shifting transmission components 100 is connected to a corresponding phase-shifting component. The phase-shifting transmission component 100 drives the connected phase-shifting component to move, thereby enabling the phase shifter containing the phase-shifting component to perform a phase-shifting operation.

[0059] The plurality of phase-shifting transmission components 100 are arranged sequentially along a first axis, wherein the first axis is perpendicular to the longitudinal axis of the rack 112 in the phase-shifting transmission component 100. Specifically, the plurality of phase-shifting transmission components 100 may be arranged in one row; or, the plurality of phase-shifting transmission components 100 may be arranged in two rows, and the two rows of phase-shifting transmission components 100 are arranged in an alternating vertical layout.

[0060] The frequency selection module can select a target phase shifting drive assembly 100 from one or two rows of phase shifting drive assemblies 100. After selecting the target phase shifting drive assembly 100, the phase shifting module establishes a transmission connection with the input gear 130 of the target phase shifting drive assembly 100, drives the input gear 130 to rotate, and sequentially drives the worm gear 120 and rack 112 of the target phase shifting drive assembly 100 to move. Finally, the rack 112 drives the phase shifting component connected to it to move, thereby realizing the phase shifting function.

[0061] In summary, the phase-shifting transmission assembly of this invention, through the coordinated operation of the rack and worm gear, can effectively drive the phase-shifting component to move, thereby realizing phase-shifting operation. In this phase-shifting transmission assembly, the rack and worm gear combination offers a significant advantage in high transmission accuracy. Simultaneously, its overall structural design effectively controls production costs, keeping them at a low level. Therefore, it possesses both feasibility and economic viability for large-scale application in the industry.

[0062] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this utility model is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features of this utility model that have similar functions.

[0063] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A phase-shifting transmission assembly, characterized in that, The device includes a phase shifter and a worm gear. The phase shifter is equipped with a rack, and the worm gear meshes with the rack. One end of the phase shifter along its length is used to connect to the phase shifting component of the phase shifter. The worm gear is used to receive external torque and rotate, thereby driving the rack to move the phase shifting component linearly along its length to perform phase shifting.

2. The phase-shifting transmission assembly as described in claim 1, characterized in that, The phase-shifting transmission assembly further includes a stop assembly, which includes a first stop member disposed on the worm gear and a second stop member disposed on one or both ends of the rack along its length direction. The first stop member and the second stop member are in contact to stop the movement.

3. The phase-shifting transmission assembly as described in claim 2, characterized in that, The first stop is disposed in one section of the extension path of the thread groove of the external thread of the worm, and the second stop is disposed in the tooth groove at the end of the rack in the length direction.

4. The phase-shifting transmission assembly as described in claim 3, characterized in that, The first stop protrudes from the bottom of the threaded groove, and the second stop protrudes from the bottom of the toothed groove.

5. The phase-shifting transmission assembly as described in claim 3, characterized in that, The first stop is integrally formed with the worm gear, and the second stop is integrally formed with the rack.

6. The phase-shifting transmission assembly as described in claim 2, characterized in that, The first stop includes a stop ring, and the second stop includes a pusher. The worm gear has a protruding insertion shaft at one end in the length direction. The stop ring is sleeved on the insertion shaft. A stop block is protruding at the end of the stop ring opposite to the insertion shaft. The pusher is located at one end of the rack in the length direction. The pusher can abut against the stop ring so that the stop block is pushed by the stop ring to abut against the external thread of the worm gear.

7. The phase-shifting transmission assembly as described in claim 6, characterized in that, The first stop further includes a spring. The stop ring has an inner groove with the opening of the inner groove facing the insertion shaft. The spring is installed in the inner groove and sleeved on the insertion shaft. The pusher is used to apply force to the stop ring to compress the spring, so that after the stop ring moves, the stop block abuts against the external thread.

8. The phase-shifting transmission assembly as described in claim 7, characterized in that, A mounting groove is provided at one end of the rack along its length. The pusher is installed in the mounting groove and protrudes from the opening of the mounting groove. The pusher can abut against the stop ring.

9. The phase-shifting transmission assembly as described in any one of claims 1 to 8, characterized in that, The phase-shifting transmission assembly further includes an input gear and an output gear. The output gear is mounted on the worm, and the input gear is connected to the output gear in a transmission manner. The input gear is used to receive external torque so as to drive the worm to rotate via the output gear.

10. The phase-shifting transmission assembly as claimed in claim 1, characterized in that, The phase-shifting transmission assembly also includes a mounting box, in which the worm gear is installed, and the mounting box is also provided with a moving channel through which the rack passes.

11. A frequency-selective phase-shifting device, characterized in that, The device includes a frequency selection module, a phase shifting module, and multiple phase shifting drive components as described in any one of claims 1 to 10. The multiple phase shifting drive components are respectively applied to and connected to multiple external phase shifting components. The multiple phase shifting drive components are arranged in one row or two rows along the same axis. The frequency selection module is used to select one of the phase shifting drive components. The phase shifting module is used to drive the worm gear of the selected phase shifting drive component to rotate, so as to drive the connected phase shifting component to move accordingly and implement phase shifting.

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