Automatic thread sleeve loosening and tightening machine for testing radio frequency cable assembly

Abstract

The invention discloses an automatic thread sleeve tightening machine for radio frequency cable assembly testing, belongs to the technical field of radio frequency cable assembly testing, and solves the problem of low testing efficiency of an existing radio frequency cable assembly due to the fact that a thread sleeve is manually screwed. The device comprises a hollow test support, a hollow driver and a rotary support, the hollow test support comprises a semicircular cylinder for a test line of the network analyzer to pass through, and at least one adapter fixing seat for fixing an adapter is arranged on the inner wall of the semicircular cylinder; the rotating support comprises a U-shaped base, the U-shaped base is fixed to the hollow speed reducer, and a fixing base is movably arranged on the U-shaped base. The hollow driver drives the rotary support to enable the U-shaped base to rotate around the semicircular cylinder, the fixing base movably arranged on the U-shaped base can drive the threaded sleeve to move in a self-adaptive mode in the rotating process, the threaded sleeve is made to rotate and linearly move at the same time, threaded connection with the adapter is completed, and the testing efficiency of the radio frequency cable assembly is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency cable assembly testing, and in particular to an automatic thread sleeve tightening and loosening machine for radio frequency cable assembly testing. Background Art

[0002] RF cable assembly is a special cable used to transmit high-frequency signals. It is widely used in communications, radar, broadcasting and television, test and measurement and other fields. It consists of two parts: RF cable and RF connector. The RF connector is often mechanically fixed by a screw sleeve (threaded ring) to ensure stable connection and impedance matching.

[0003] During RF cable assembly testing, a network analyzer is required to verify high-frequency signal transmission performance. This test involves connecting the network analyzer's test leads to the threaded sleeves on the RF test cable via an adapter. Existing RF cable assembly testing often involves manually screwing the threaded sleeves onto the adapter, resulting in low testing efficiency. Summary of the Invention

[0004] In response to the above-mentioned problems in the prior art, the present invention provides an automatic screw sleeve tightening machine for testing radio frequency cable assemblies, which solves the problem of low testing efficiency of existing radio frequency cable assemblies due to manual screwing of the screw sleeve.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: Provided is an automatic screw sleeve loosening and tightening machine for testing radio frequency cable components, comprising: a hollow test bracket, the hollow test bracket comprising a semi-cylinder for a test line of a network analyzer to pass through, at least one adapter fixing seat for fixing an adapter being provided on the inner wall of the semi-cylinder; a hollow driver, the hollow driver comprising a hollow reducer sleeved on the semi-cylinder, the input end of the hollow reducer being transmission-connected to the output shaft of a motor; a rotating bracket, the rotating bracket comprising a U-shaped seat, a side plate of the U-shaped seat being fixed to the hollow output end of the hollow reducer, and a fixing seat for fixing the screw sleeve being provided on the U-shaped seat so as to move along the axial direction of the semi-cylinder.

[0006] The beneficial effects of this solution are as follows. The hollow driver drives the rotating bracket to make the U-shaped seat rotate around the semi-cylindrical body, so that the fixed seat movably arranged on the U-shaped seat can adaptively drive the screw sleeve to move during the rotation, enabling the screw sleeve to perform both rotational and linear motions simultaneously, completing the threaded connection with the adapter, and improving the test efficiency of the RF cable assembly. Among them, the opening of the semi-cylindrical body not only facilitates accommodating the test line of the network analyzer, avoiding the test line being driven and reducing the test accuracy, but also is conducive to fixing the adapter fixed seat. At the same time, the hollow driver sleeved on the semi-cylindrical body exposes the side of the U-shaped seat for fixing the screw sleeve, facilitating the installation of the screw sleeve in the RF cable assembly on the fixed seat through the screw sleeve fixture.

[0007] Furthermore, a hollow torque sensor is fixed between the hollow output end of the hollow speed reducer and the U-shaped seat. The hollow torque sensor not only serves as a coupling to complete the transmission connection between the U-shaped seat and the hollow speed reducer, but also can detect the forward or reverse torque of the screw sleeve, improving the torque accuracy of the screw sleeve, avoiding torque overshoot and causing damage to the edges of the screw sleeve. At the same time, torque can be used as a feedback signal to make the control more precise. After the screw sleeve and the connector reach the torque required by the technical requirements, then slightly reverse-rotate to make the measured value of the torque of the rotating arm applying the torque zero, ensuring that there is no circumferential torque and other external forces between the screw sleeve and the adapter except for the axial pre-tightening force, and ensuring the consistency and accuracy of batch testing.

[0008] Furthermore, U-shaped openings are provided on both side plates of the U-shaped seat and the top of the fixed seat, and the width of each U-shaped opening is greater than the outer ring diameter of the semi-cylindrical body. The setting of the three U-shaped openings can make the center lines of the RF cable, the screw sleeve, and the adapter coincide. The setting that the width of the U-shaped opening is greater than the outer diameter of the semi-cylindrical body can prevent mechanical interference between the U-shaped seat and the semi-cylindrical body during rotation or movement.

[0009] Furthermore, a guide rod mechanism extending along the axis direction of the semi-cylindrical body is provided on the inner wall of the side plate of the U-shaped seat far from the hollow speed reducer, and the fixed seat is movably arranged on the guide rod mechanism. The guide rod mechanism guides the fixed seat to move linearly along the axis direction of the semi-cylindrical body, avoiding the alignment deviation of the screw sleeve and the adapter caused by skewing.

[0010] Furthermore, the guide rod mechanism at least includes two guide rods symmetrically fixed on both sides of the side plate of the U-shaped seat respectively. Each guide rod is sleeved with a compression spring, and both sides of each compression spring are fixed on the side plate of the U-shaped seat and the fixed seat respectively. The pre-pressure of the compression spring enables a certain adjustable pre-tightening force between the screw sleeve and the threaded port of the adapter, facilitating the quick screwing of the screw sleeve with the thread on the adapter.

[0011] Further, at least one telescopic member that telescopically moves along the axial direction of the semi-cylindrical barrel is provided on the bottom of the outer wall of the semi-cylindrical barrel; when the telescopic end is in the extended state, it pushes the fixing seat away from the semi-cylindrical barrel, and when the telescopic end is in the retracted state, it moves away from the fixing seat. When the telescopic member is in the extended state, the fixing seat is made to overcome the elastic force of the compression spring to move away from the semi-cylindrical barrel, facilitating the replacement of the screw sleeve on the sleeve fixture fixing seat; when the telescopic member is in the retracted state, the fixing seat approaches the semi-cylindrical barrel under the pre-tightening force of the compression spring, so that there is a certain adjustable pre-tightening force between the screw sleeve and the threaded port of the adapter.

[0012] Further, a distance sensor for detecting the moving distance of the screw sleeve fixture fixing seat is provided on the side plate of the U-shaped seat away from the hollow speed reducer. The distance sensor can detect the moving distance of the screw sleeve fixture fixing seat, which not only facilitates the control of the threaded connection length between the screw sleeve and the adapter, but also the moving distance of the screw sleeve fixture fixing seat can be used in combination with the number of rotation turns of the hollow speed reducer and the pitch of the screw sleeve. Since the product of the number of rotation turns of the screw sleeve and the pitch can reflect the threaded connection length of the screw sleeve, by comparing the magnitude relationship between the product of the number of rotation turns of the screw sleeve and the pitch and the moving distance of the screw sleeve fixture fixing seat during assembly, it can be determined whether the screw sleeve is assembled successfully or whether the screw sleeve has a thread slipping phenomenon.

[0013] Further, at least one arc-shaped groove for bolt connection with the adapter fixing seat is provided on the inner wall of the semi-cylindrical barrel. The provision of the arc-shaped groove not only facilitates the fixing of the adapter fixing seat, but also facilitates the adjustment of the installation angle of the adapter fixing seat.

[0014] Further, the hollow test bracket further includes a base, a fixing plate is vertically fixed on the base, the hollow speed reducer is fixed on the fixing plate, a rectangular opening for fixing the motor is provided at the top of the fixing plate, and a semi-circular hole for the semi-cylindrical barrel to pass through is provided at the bottom of the rectangular opening of the fixing plate. The design of the rectangular opening and the semi-circular hole of the fixing plate realizes the compact installation of the motor and the semi-cylindrical barrel on the fixing plate, ensuring the rigid connection between the drive system and the test bracket.

[0015] Further, the base is fixed inside the housing for fixing the network analyzer, and a through hole for the semi-cylindrical barrel to pass through is provided on one side of the housing. The integrated design of the base and the housing integrates the network analyzer into the housing, reducing external environmental interference; the rotating bracket is located outside the housing, facilitating the replacement of the RF cable assembly for testing. Description of the Drawings

[0016] Figure 1 Schematic structural diagram of a screw sleeve automatic tightening and loosening machine for RF cable assembly testing; Figure 2 Side view of a screw sleeve automatic tightening and loosening machine for RF cable assembly testing; Figure 3 Partial schematic structural diagram of a screw sleeve automatic tightening and loosening machine for RF cable assembly testing; Figure 4 It is a structural schematic diagram of the housing; Figure 5 It is an axonometric drawing of the screw sleeve fixture; Figure 6 It is a side view of the screw sleeve fixture; Wherein: 1. Hollow test bracket; 11. Semi-cylindrical tube; 111. Arc-shaped groove; 112. Telescopic member; 12. Base; 13. Fixed plate; 2. Hollow driver; 21. Hollow speed reducer; 22. Motor; 23. Hollow torque sensor; 3. Rotating bracket; 31. U-shaped seat; 32. Fixed seat; 311. Guide rod mechanism; 4. Adapter fixed seat; 5. Housing; 6. Screw sleeve fixture; 61. Lifting cylinder; 62. Support plate; 63. Connecting plate; 64. Pressure plate. Specific embodiments

[0017] The following describes the specific embodiments of the present invention to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions created using the concept of the present invention are within the scope of protection.

[0018] In the existing radio frequency cable assembly during the test, it is common to manually screw the screw sleeve of the radio frequency connector on the radio frequency cable onto the adapter of the network analyzer by hand, resulting in the problem of low test efficiency. To solve the problem of low efficiency, an automatic nut machine is used in the prior art to tighten the screw sleeve onto the adapter to improve efficiency. However, during the test of the radio frequency cable assembly, it is required that the test line needs to be kept stable during the test. Since the existing automatic nut machine does not have a channel provided to accommodate the test line, it is difficult to avoid moving the test line during the process of driving the screw sleeve to rotate, reducing the test accuracy and service life. At the same time, sometimes two or more adapters need to be fixed during the test of the radio frequency cable, while the automatic nut machine usually has only one fixed end and cannot fix two or more adapters.

[0019] In order to overcome the problem of low test efficiency, this application provides a screw sleeve automatic tightening and loosening machine for testing radio frequency cable assemblies. The hollow driver 2 drives the rotating bracket 3 to make the U-shaped seat 31 rotate around the semi-cylindrical tube 11, so that the fixed seat 32 movably arranged on the U-shaped seat 31 can adaptively drive the screw sleeve to move during the rotation, making the screw sleeve perform both rotational motion and linear motion simultaneously to complete the threaded connection with the adapter, improving the test efficiency of the radio frequency cable assembly. The following provides a detailed display of it.

[0020] Reference Figure 1 and Figure 2, an automatic thread sleeve tightening and loosening machine for testing radio frequency cable components, including a hollow test bracket 1, a hollow driver 2 and a rotating bracket 3.

[0021] refer to Figure 3 The hollow test stand 1 includes a semi-cylinder 11 for the network analyzer test line to pass through. At least one adapter holder 4 is provided on the inner wall of the semi-cylinder 11. Each adapter holder 4 is used to fix an adapter. The opening of the semi-cylinder 11 is not only convenient for accommodating the network analyzer test line, preventing the test line from being dragged and reducing the test accuracy, but also facilitates the fixing of the adapter holder 4. In this embodiment, four arc grooves 111 are provided on the inner wall of the semi-cylinder 11 for bolt connection with the adapter fixing base 4, wherein the central angle of the arc groove 111 is 60°. The setting of the arc groove 111 not only facilitates the fixing of the adapter fixing base 4, but also facilitates the adjustment of the installation angle of the adapter fixing base 4.

[0022] The hollow driver 2 is used to drive the rotating bracket 3 to rotate on the hollow test bracket 1. It includes a hollow reducer 21 mounted on the semi-cylinder 11. The input end of the hollow reducer 21 is connected to the output shaft of the motor 22, and the hollow output end of the hollow reducer 21 is connected to the rotating bracket 3.

[0023] The rotating bracket 3 includes a U-shaped seat 31, one side plate of which is fixed to the hollow output end of the hollow reducer 21. A fixing seat 32 is provided on the U-shaped seat 31 so as to be movable along the axial direction of the semi-cylinder 11. The fixing seat 32 fixes the screw sleeve via a screw sleeve fixture 6. The hollow driver 2, which is sleeved on the semi-cylinder 11, exposes one side of the U-shaped seat 31 for fixing the screw sleeve, making it easier for the screw sleeve in the RF cable assembly to be installed on the fixing seat 32. Among them, the adapter fixing seat 4 is prior art, and its specific working principle and connection relationship will not be described in detail in this embodiment.

[0024] The two side panels of the U-shaped seat 31 and the top of the fixed seat 32 are each provided with a U-shaped opening, and the width of each U-shaped opening is greater than the outer ring diameter of the semi-cylinder 11. The arrangement of the three U-shaped openings allows the centerlines of the RF cable, the screw sleeve, and the adapter to coincide. The width of the U-shaped openings being greater than the outer diameter of the semi-cylinder 11 prevents mechanical interference between the U-shaped seat 31 and the semi-cylinder 11 during rotation or movement.

[0025] To enable the fixed seat 32 to move along the axis of the semi-cylinder 11, a guide rod mechanism 311 extending along the axis of the semi-cylinder 11 is provided on the inner wall of a side plate of the U-shaped seat 31, away from the hollow reducer 21. The fixed seat 32 is movable on the guide rod mechanism 311. The guide rod mechanism 311 is used to guide the fixed seat 32 to move linearly along the axis of the semi-cylinder 11, thereby preventing misalignment between the screw sleeve and the adapter caused by deflection.

[0026] In this embodiment, the guide rod mechanism 311 includes two guide rods symmetrically fixed on both sides of the side plate of the U-shaped seat 31 respectively and a guide rod arranged at the bottom of the side plate of the U-shaped seat 31. The three guide rods are distributed in an equilateral triangle. A compression spring is sleeved on each guide rod, and both sides of each compression spring are fixed on the side plate of the U-shaped seat 31 and the fixed seat 32 respectively. The pre-pressure of the compression spring enables the adjustable pre-tightening force between the screw sleeve and the threaded port of the adapter, which facilitates the quick screwing of the screw sleeve with the thread on the adapter.

[0027] To ensure that the fixed seat 32 moves along the guide rod during rotation to achieve the threaded connection between the screw sleeve and the adapter, two telescopic members 112 that can expand and contract along the axial direction of the semi-cylindrical barrel 11 are symmetrically arranged at the bottom of the outer wall of the semi-cylindrical barrel 11. When the telescopic end is in the extended state, it pushes the fixed seat 32 in the direction away from the semi-cylindrical barrel 11, and when the telescopic end is in the retracted state, it is away from the fixed seat 32.

[0028] When the telescopic member 112 is in the extended state, the fixed seat 32 overcomes the elastic force of the compression spring to move away from the semi-cylindrical barrel 11, which is convenient for replacing the screw sleeve on the sleeve fixture fixed seat; when the telescopic member 112 is in the retracted state, the fixed seat 32 approaches the semi-cylindrical barrel 11 under the pre-tightening force of the compression spring, so that there is a certain adjustable pre-tightening force between the screw sleeve and the threaded port of the adapter. In this embodiment, the telescopic member 112 can be a cylinder, a hydraulic cylinder or an electric push rod.

[0029] To improve the torque accuracy of the screw sleeve, a hollow torque sensor 23 is fixed between the hollow output end of the hollow speed reducer 21 and the U-shaped seat 31. The hollow torque sensor 23 not only acts as a coupling to complete the transmission connection between the U-shaped seat 31 and the hollow speed reducer 21, but also can detect the forward torque or reverse torque of the screw sleeve, improve the torque accuracy of the screw sleeve, and avoid the torque overshoot caused by the screw sleeve edge being damaged. At the same time, the torque can be used as a feedback signal to make the control more accurate. After the screw sleeve and the connector reach the torque required by the technical requirements, then slightly reverse the rotation, so that the measured value of the torque of the rotating arm applying the torque is zero, ensuring that there is no circumferential torque and other external forces between the screw sleeve and the adapter except for the axial pre-tightening force, and ensuring the consistency and accuracy of the batch tests.

[0030] As a further solution of this embodiment, a distance sensor (not shown in the figure) for detecting the moving distance of the fixed seat 32 is provided on the side plate of the U-shaped seat 31 away from the hollow speed reducer 21. The distance sensor can detect the moving distance of the fixed seat 32, which not only facilitates the control of the threaded connection length between the screw sleeve and the adapter, but also the moving distance of the fixed seat 32 can be combined with the number of rotation turns of the hollow speed reducer and the pitch of the screw sleeve. Since the product of the number of rotation turns of the screw sleeve and the pitch can reflect the threaded connection length of the screw sleeve, by comparing the size relationship between the product of the number of rotation turns of the screw sleeve and the pitch and the moving distance of the fixed seat 32 during assembly, it can be determined whether the screw sleeve is successfully assembled or whether the screw sleeve has a thread slipping phenomenon.

[0031] As a further solution of this embodiment, the hollow test bracket 1 further includes a base 12. A fixing plate 13 is vertically fixed on the base 12. The hollow speed reducer 21 is fixed on the fixing plate 13. A rectangular opening for fixing the motor 22 is provided at the top of the fixing plate 13, and a semi-circular hole for the semi-cylindrical barrel 11 to pass through is provided at the bottom of the fixing plate 13 in the rectangular opening. The design of the rectangular opening and the semi-circular hole of the fixing plate 13 realizes the compact installation of the motor 22 and the semi-cylindrical barrel 11 on the fixing plate 13, ensuring the rigid connection between the drive system and the test bracket.

[0032] In this embodiment, referring to Figure 4 , the base 12 is fixed in a housing 5 for fixing a network analyzer. A through hole for the semi-cylindrical barrel 11 to pass through is provided on one side of the housing 5. The integrated design of the base 12 and the housing 5 integrates the network analyzer into the housing, reducing external environmental interference. The rotating bracket 3 is located outside the housing, facilitating the replacement of the RF cable assembly for testing. Among them, a control panel signal-connected to the controller is further provided on the housing 5. The controller is respectively signal-connected to the motor 22, the telescopic member 112, and the distance sensor. The control panel can control the forward and reverse rotation, the number of revolutions of the motor 22, and the torque of the hollow torque sensor 23.

[0033] As a further solution of this embodiment, a specific structure of a screw sleeve fixture 6 is provided in this embodiment. Referring to Figure 5 and Figure 6 , the screw sleeve fixture 6 includes a lifting cylinder 61 fixed on the base 12, a support plate 62, two connecting plates 63, and a pressing plate 64. Both ends of the pressing plate 64 are respectively fixedly connected to one ends of the two connecting plates 63. The other ends of the two connecting plates 63 are respectively fixed to the two ends of the top of the support plate 62. The middle parts of the two connecting plates 63 are both slidably connected to the side plates of the U-shaped seat 31 in the vertical direction through a pull rod with a compression spring. The two connecting plates 63 drive the pressing plate 64 to press the screw sleeve located in the fixed seat 32 under the pulling force of the compression spring. The free end of the lifting cylinder 61 is used to jack up the support plate 62 upward so as to drive the pressing plate 64 to lift upward, facilitating the removal of the screw sleeve.

[0034] In summary, the working principle of this solution is as follows: Before the test starts, the ferrule on the RF connector of the RF cable assembly is installed on the fixed seat 32 through the ferrule clamp 6, so that the telescopic member 112 is in the retracted state. The fixed seat 32 drives the ferrule to contact the adapter under the elastic force of the compression spring and ensures a certain axial pre-tightening force. Start the motor 22 to rotate forward. The motor 22 drives the rotating bracket 3 to rotate through the hollow reducer and the hollow torque sensor 23, so that the ferrule rotates and moves linearly at the same time. When the torque between the ferrule and the adapter reaches the specified torque value, the motor 22 stops and moves slightly in the reverse direction, so that the torque detected by the hollow torque sensor 23 drops to zero, and the cable assembly to be tested starts to be tested.

[0035] After the test is completed, start the motor 22 to rotate in the reverse direction. When a certain torque value is reached, wait for the ferrule to start to loosen and continue to unscrew. After reaching the set number of turns to ensure that the ferrule is completely unscrewed, make the telescopic member 112 in the extended state. The telescopic member 112 pushes the fixed seat 32 outwards by a certain distance, opens the self-locking mechanism on the fixed seat 32, and takes out the ferrule.

[0036] Although the specific implementation mode of the invention has been described in detail in conjunction with the accompanying drawings, it should not be construed as a limitation on the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative work still fall within the protection scope of this patent.

Claims

1. Automatic tightening and loosening machine for ferrules used in radio frequency cable assembly tests, characterized in that, Comprising: A hollow test bracket (1), the hollow test bracket (1) includes a semi-cylindrical tube (11) for a test line of a network analyzer to pass through, and at least one adapter fixing seat (4) for fixing an adapter is provided on the inner wall of the semi-cylindrical tube (11); A hollow driver (2), the hollow driver (2) includes a hollow speed reducer (21) sleeved on the semi-cylindrical tube (11), and the input end of the hollow speed reducer (21) is in transmission connection with the output shaft of a motor (22); A rotating bracket (3), the rotating bracket (3) includes a U-shaped seat (31), one side plate of the U-shaped seat (31) is fixed on the hollow output end of the hollow speed reducer (21), and a fixing seat (32) for fixing a screw sleeve is movably arranged on the U-shaped seat (31) along the axis direction of the semi-cylindrical tube (11).

2. The automatic tightening and loosening machine for the screw sleeve used in the radio frequency cable assembly test according to claim 1, characterized in that, A hollow torque sensor (23) is fixed between the hollow output end of the hollow speed reducer (21) and the U-shaped seat (31).

3. The automatic tightening and loosening machine for the screw sleeve used in the radio frequency cable assembly test according to claim 1, characterized in that, U-shaped openings are provided on the two side plates of the U-shaped seat (31) and the top of the fixing seat (32), and the width of each U-shaped opening is greater than the outer ring diameter of the semi-cylindrical tube (11).

4. The automatic tightening and loosening machine for the screw sleeve used in the test of the RF cable assembly according to claim 1, wherein, A guide rod mechanism (311) extending along the axis direction of the semi-cylindrical tube (11) is provided on the inner wall of the side plate of the U-shaped seat (31) far from the hollow speed reducer (21), and the fixing seat (32) is movably arranged on the guide rod mechanism (311).

5. The automatic screwing machine for the screw sleeve used in the radio frequency cable assembly test according to claim 4, characterized in that, The guide rod mechanism (311) at least includes two guide rods symmetrically fixed on both sides of the side plate of the U-shaped seat (31) respectively, an extrusion spring is sleeved on each guide rod, and both sides of each extrusion spring are fixed on the side plate of the U-shaped seat (31) and the fixing seat (32) respectively.

6. The automatic tightening and loosening machine for the screw sleeve used in the radio frequency cable assembly test according to claim 5, characterized in that, At least one telescopic member (112) that telescopically moves along the axis direction of the semi-cylindrical tube (11) is provided on the bottom of the outer wall of the semi-cylindrical tube (11); The telescopic end of each telescopic member (112) includes an extended state and a retracted state. When the telescopic end is in the extended state, it pushes the fixing seat (32) in a direction away from the semi-cylindrical tube (11), and when the telescopic end is in the retracted state, it is away from the fixing seat (32).

7. The automatic tightening and loosening machine for the screw sleeve used in the radio frequency cable assembly test according to claim 1, wherein A distance sensor for detecting the moving distance of the fixing seat (32) is provided on the side plate of the U-shaped seat (31) far from the hollow speed reducer (21).

8. The automatic screwing machine for the screw sleeve used in the radio frequency cable assembly test according to claim 1, wherein, At least one arc-shaped groove (111) for bolt connection with the adapter fixing seat (4) is provided on the inner wall of the semi-cylindrical tube (11).

9. The automatic tightening and loosening machine for the screw sleeve used in the radio frequency cable assembly test according to claim 1, characterized in that, The hollow test bracket (1) further includes a base (12), a fixing plate (13) is vertically fixed on the base (12), the hollow speed reducer (21) is fixed on the fixing plate (13), a rectangular opening for fixing the motor (22) is provided on the top of the fixing plate (13), and a semi-circular hole for the semi-cylindrical tube (11) to pass through is provided at the bottom of the rectangular opening of the fixing plate (13).

10. The automatic screwing machine for the testing of the RF cable assembly according to claim 9, wherein, The base (12) is fixed in a housing (5) for fixing a network analyzer, and a through hole for the semi-cylindrical tube (11) to pass through is provided on one side of the housing (5).

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