Indoor directional single-polarization wall hanging antenna

Abstract

The invention relates to the technical field of communication, in particular to an indoor directional single-polarization wall hanging antenna which comprises a shell, a cable assembly, an impedance matching plate, a coaxial line, a radiation oscillator, two parasitic coupling pieces, two coupling pieces and a feed assembly, the shell comprises a bottom support, an outer cover, a clamping device and a hanging structure, an interval groove is formed in the middle of the radiation oscillator in a penetrating mode, and the coaxial line is arranged in the interval groove. The feed assembly is arranged on the radiation oscillator, the cable assembly penetrates through the clamping device to be connected with the impedance matching plate, and the two ends of the coaxial line are connected with the impedance matching plate and the feed assembly respectively. The indoor directional single-polarization wall hanging antenna disclosed by the invention can meet the requirement of an operator for a frequency band range, optimizes performance indexes such as the standing-wave ratio and impedance of the antenna, and has the advantages of simplicity and convenience in fixation and flexibility in communication.

Description

Technical Field

[0001] The invention relates to the technical field of communications, in particular to an indoor directional single-polarized wall-mounted antenna. Background Art

[0002] In existing communications, operators have different requirements for the indicators of single-polarized wall-mounted antennas. For example, the frequency bands required by mobile operators are 880-960Mhz and 1710-2635Mhz. Although some existing single-polarized wall-mounted antennas can basically meet the above frequency band requirements, their performance indicators such as radiation pattern, standing wave ratio or impedance are relatively poor.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an indoor directional single-polarized wall-mounted antenna to solve the problem that the existing wall-mounted antenna cannot meet the operator's requirements for various performance indicators.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An indoor directional single-polarized wall-mounted antenna comprises a shell, a cable assembly, an impedance matching plate, a coaxial line, a radiating element, two parasitic coupling plates, two coupling members and a feeding assembly, wherein the shell comprises a base, an outer cover, a clamping device and a suspension structure, wherein the outer cover cover is arranged on the base, the clamping device is arranged on one side of the outer cover, the suspension structure is arranged on the side of the base facing away from the outer cover, the radiating element is mounted on the base, the impedance matching plate is arranged on the base adjacent to the radiating element, two parasitic coupling plates are respectively arranged on two sides of the base relative to the radiating element, two coupling members are arranged oppositely, any one coupling member is mounted on the radiating element, and the other coupling member is arranged on the inner wall of the outer cover facing the base, a spacing groove is penetrated in the middle of the radiating element, the feeding assembly is arranged on the radiating element, the cable assembly passes through the clamping device to be connected to the impedance matching plate, and the two ends of the coaxial line are respectively connected to the impedance matching plate and the feeding assembly.

[0007] In an indoor directional single-polarized wall-mounted antenna as described above, the feeding assembly includes a first groove and a first feeding plate, the first groove is arranged on a side of the radiating element opposite to the spacing groove, the first feeding plate is bent along the side of the first groove close to the spacing groove, the first feeding plate is arranged parallel to the side of the radiating element facing the outer cover, the coaxial line includes a cylindrical braided mesh and an inner conductor, the cylindrical braided mesh is sleeved on the outer side of the inner conductor, the cylindrical braided mesh is connected to a side of the spacing groove away from the first groove, and the inner conductor passes through the radiating element and is connected to the first feeding plate.

[0008] As described above, an indoor directional single-polarized wall-mounted antenna, the feeding assembly includes a second groove, a second feeding plate, a third groove and a third feeding plate, the second groove and the third groove are respectively arranged on both sides of the radiating element relative to the spacing groove, the second feeding plate is bent along the side of the second groove close to the spacing groove, the third feeding plate is bent and extended along the side of the third groove close to the spacing groove, the second feeding plate and the third feeding plate are relatively arranged on the side of the radiating element facing the base, the coaxial line includes a cylindrical braided mesh and an inner conductor, the cylindrical braided mesh is sleeved on the outer side of the inner conductor, the cylindrical braided mesh is connected to the second feeding plate, and the inner conductor passes through the second feeding plate and is connected to the third feeding plate.

[0009] In the indoor directional single-polarized wall-mounted antenna as described above, the radiating element includes a flat surface and two inclined surfaces, the spacing groove is arranged on the flat surface, the two inclined surfaces are respectively bent along the two side edges of the flat surface toward one side of the base, and the two inclined surfaces, the second feeding plate and the third feeding plate are arranged on the same straight line.

[0010] In the indoor directional single-polarized wall-mounted antenna as described above, both sides of the spacing groove are connected to each other and provided with special-shaped expansion holes.

[0011] In the indoor directional single-polarized wall-mounted antenna as described above, the two parasitic coupling plates are respectively arranged on both sides of the radiation plate along the diagonal direction of the radiation plate, and each parasitic coupling plate is respectively arranged to be inclined relative to the plane direction where the feeding component is located.

[0012] In the indoor directional single-polarized wall-mounted antenna as described above, each of the parasitic coupling plates comprises a connecting portion, a first extending portion, and a second extending portion, wherein the connecting portion is connected to the base, the first extending portion is connected to a side of the connecting portion close to the radiation plate, the first extending portion is bent and extended along an edge of the connecting portion toward a side away from the base, and the second extending portion is bent and extended along an edge of the first extending portion away from the base.

[0013] In the indoor directional single-polarized wall-mounted antenna as described above, the two coupling members are circular structures of different sizes, and the coupling member of small size is arranged on the inner wall of the outer cover on the side facing the base.

[0014] In the indoor directional single-polarized wall-mounted antenna as described above, the clamping device includes a fixed clamping piece, a movable clamping piece, an extension block and a connecting groove, the connecting groove is arranged on a side of the outer cover close to the base, the fixed clamping piece is arranged on the connecting groove, the extension block is arranged on one side of the movable clamping piece, the width of the extension block is greater than the width of the connecting groove, the extension block is clamped on the inner side of the outer cover, the base is abutted against the bottom of the extension block, the fixed clamping piece and the movable clamping piece are clamped, and the fixed clamping piece and the movable clamping piece are clamped on both sides of one end of the cable assembly.

[0015] In the indoor directional single-polarized wall-mounted antenna as described above, the fixed connector includes a U-shaped connector, a first half sleeve and two plug-in slots, the U-shaped connector is arranged on the connecting slot, the first half sleeve is arranged on the inner top of the U-shaped connector, and the two plug-in slots are respectively arranged on both sides of the opening end of the U-shaped connector, the movable connector includes a spacer, a second half sleeve and two plug-in blocks, the second half sleeve is arranged on the top of the spacer corresponding to the first half sleeve, the two plug-in blocks are respectively arranged on both sides of the spacer, and the two plug-in blocks are respectively plugged into the two plug-in slots one by one.

[0016] Beneficial effects:

[0017] The invention discloses an indoor directional single-polarized wall-mounted antenna, comprising a shell, a cable assembly, an impedance matching plate, a coaxial line, a radiating vibrator, two parasitic coupling plates, two coupling members and a feeding assembly. The shell comprises a bottom bracket, an outer cover, a clamping device and a suspension structure. The radiating vibrator has the function of guiding and amplifying electromagnetic waves and is used for receiving and transmitting high and low frequency band signals. The cable assembly, the impedance matching plate, the coaxial line and the feeding assembly are connected in sequence for feeding. The two parasitic coupling plates are respectively connected to the bottom bracket to realize grounding of the two parasitic coupling plates, generate low-frequency resonance points, expand the low-frequency impedance bandwidth, and ensure stable performance of high and low frequency bands. In addition, the two parasitic coupling plates also have the function of adjusting low-frequency standing waves. The two coupling members improve the directional pattern and the standing wave ratio. The impedance matching plate reduces the reflection and loss of the signal during the transmission process and avoids the distortion of the signal waveform. The invention discloses an indoor directional single-polarized wall-mounted antenna, which can meet the needs of operators for the frequency band range, optimize the antenna standing wave ratio and impedance and other performance indicators, and has the advantages of simple and convenient fixation and flexible communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the wall-mounted antenna provided by the present invention;

[0019] Figure 2 An exploded view of the wall-mounted antenna according to the first embodiment of the present invention;

[0020] Figure 3 An exploded view of the wall-mounted antenna of the second embodiment provided by the present invention;

[0021] Figure 4 An exploded view of the wall-mounted antenna of the second embodiment provided by the present invention from another angle;

[0022] Figure 5 Table of performance index parameters of the wall-mounted antenna provided by the present invention;

[0023] Figure numerals: 1. shell; 11. base; 12. outer cover; 13. clamping device; 14. suspension structure; 15. fixed clamping piece; 151. U-shaped clamping piece; 152. first half sleeve; 153. plug-in slot; 16. movable clamping piece; 161. spacer block; 162. second half sleeve; 163. plug-in block; 17. extension block; 18. connecting slot; 2. cable assembly; 3. impedance matching plate; 4. coaxial line; 5. radiating oscillator; 51. spacing slot; 52. first groove; 53. first feeding plate; 54. second groove; 55. second feeding plate; 56. third groove; 57. third feeding plate; 58. straight surface; 59. inclined surface; 6. parasitic coupling plate; 61. connecting part; 62. first extension part; 63. second extension part; 7. coupling piece. DETAILED DESCRIPTION

[0024] The present invention provides an indoor directional single-polarized wall-mounted antenna. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0025] In the description of the present invention, it should be understood that the orientation or position relationship indicated by the term "top" etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and should not be understood as a limitation on the present invention; in addition, the terms "installation", "connection" etc. should be understood in a broad sense, and for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0026] like Figure 1-5As shown, the embodiment of the present application proposes an indoor directional single-polarized wall-mounted antenna, including a shell 1, a cable assembly 2, an impedance matching plate 3, a coaxial line 4, a radiating oscillator 5, two parasitic coupling plates 6, two coupling members 7 and a feeding assembly, the shell 1 includes a base 11, an outer cover 12, a clamping device 13 and a suspension structure 14, the outer cover 12 is covered on the base 11, the clamping device 13 is arranged on one side of the outer cover 12, the suspension structure 14 is arranged on the side of the base 11 facing away from the outer cover 12, the radiating oscillator 5 is mounted on the base 11, the impedance matching plate 3 is adjacent to the radiating oscillator 5, and the radiating oscillator 5 is mounted on the base 11. The radiating vibrator 5 is arranged on the base 11, the two parasitic coupling plates 6 are respectively arranged on the two sides of the base 11 relative to the radiating vibrator 5, the two coupling members 7 are arranged opposite to each other, any one of the coupling members 7 is mounted on the radiating vibrator 5, and the other coupling member 7 is arranged on the inner wall of the outer cover 12 facing the base 11, a spacing groove 51 is passed through the middle of the radiating vibrator 5, the feeding assembly is arranged on the radiating vibrator 5, the cable assembly 2 is connected to the impedance matching plate 3 through the clamping device 13, and the two ends of the coaxial line 4 are respectively connected to the impedance matching plate 3 and the feeding assembly.

[0027] The present invention discloses an indoor directional single-polarized wall-mounted antenna, comprising a housing 1, a cable assembly 2, an impedance matching plate 3, a coaxial line 4, a radiating vibrator 5, two parasitic coupling plates 6, two coupling members 7 and a feeding assembly. The housing 1 comprises a base 11, an outer cover 12, a clamping device 13 and a suspension structure 14. The radiating vibrator 5 has the function of guiding and amplifying electromagnetic waves and is used to receive and transmit high and low frequency band signals. The cable assembly 2, the impedance matching plate 3, the coaxial line 4 and the feeding assembly are connected in sequence for feeding. The two parasitic coupling plates 6 are respectively connected to the base 11 to realize The two parasitic coupling pieces 6 are now grounded to generate low-frequency resonance points, expand the low-frequency impedance bandwidth, and at the same time ensure the stable performance of the high and low frequency bands. The other two parasitic coupling pieces 6 also have the function of adjusting low-frequency standing waves. The two coupling parts 7 improve the directivity diagram and standing wave ratio. The impedance matching plate 3 reduces the reflection and loss of the signal during transmission and avoids distortion of the signal waveform. The indoor directional single-polarized wall-mounted antenna disclosed in the present invention can meet the operator's requirements for the frequency band range, optimizes the antenna standing wave ratio and impedance and other performance indicators, and has the advantages of simple and convenient fixation and flexible communication.

[0028] Embodiment 1 disclosed in the present invention:

[0029] The feeding assembly includes a first groove 52 and a first feeding plate 53, the first groove 52 is arranged on a side of the radiating element 5 opposite to the spacing groove 51, the first feeding plate 53 is bent along the side of the first groove 52 close to the spacing groove 51, and the first feeding plate 53 is arranged parallel to the side of the radiating element 5 facing the outer cover 12, the coaxial line 4 includes a cylindrical braided mesh and an inner conductor, the cylindrical braided mesh is sleeved on the outer side of the inner conductor, the cylindrical braided mesh is connected to the side of the spacing groove 51 away from the first groove 52, the inner conductor passes through the radiating element 5 and is connected to the first feeding plate 53, the inner conductor transmits high frequency, and the cylindrical braided mesh transmits low frequency and plays a shielding role at the same time, wherein the first feeding plate 53 is formed by cutting and folding the radiating element 5, on the one hand to reduce the production of parts and components and reduce costs; on the other hand, it can help improve the performance of the antenna, such as increasing the gain or changing the radiation direction.

[0030] Embodiment 2 disclosed in the present invention:

[0031] The feeding assembly includes a second groove 54, a second feeding plate 55, a third groove 56 and a third feeding plate 57. The second groove 54 and the third groove 56 are respectively arranged on both sides of the radiating vibrator 5 relative to the spacing groove 51. The second feeding plate 55 is bent along the side of the second groove 54 close to the spacing groove 51, and the third feeding plate 57 is bent and extended along the side of the third groove 56 close to the spacing groove 51. The second feeding plate 55 and the third feeding plate 57 are relatively arranged on the side of the radiating vibrator 5 facing the base 11. The coaxial line 4 includes a cylindrical braided mesh and an inner conductor. The cylindrical braided mesh is sleeved on the outer side of the inner conductor. The cylindrical braided mesh is connected to the second feeding plate 55, and the inner conductor passes through the second feeding plate 55 and is connected to the third feeding plate 57, that is, the second feeding plate 55 and the third feeding plate 57 are formed by cutting and folding the radiating vibrator 5 respectively.

[0032] Furthermore, the radiating vibrator 5 includes a straight surface 58 and two inclined surfaces 59, the spacing groove 51 is arranged on the straight surface 58, and the two inclined surfaces 59 are respectively bent along the two side edges of the straight surface 58 toward one side of the base 11, and the two inclined surfaces 59, the second feeding plate 55 and the third feeding plate 57 are arranged on the same straight line to change the radiation direction and further enhance the antenna radiation efficiency.

[0033] The radiation plate 5 and the feeding assembly are an integrally formed structure, the overall design structure is more stable, and the exposed edges formed by improper assembly are avoided, the edge effect is reduced, and unnecessary electromagnetic radiation and signal loss are reduced.

[0034] The two sides of the spacing groove 51 are respectively connected with special-shaped expansion holes 50, and the bandwidth of the antenna is expanded through the special-shaped expansion holes 50 on both sides.

[0035] The two parasitic coupling plates 6 are respectively arranged on both sides of the radiation plate 5 along the diagonal direction of the radiation plate 5, and each of the parasitic coupling plates 6 is respectively arranged obliquely relative to the plane direction where the feeding component is located, wherein each of the parasitic coupling plates 6 includes a connecting portion 61, a first extending portion 62 and a second extending portion 63, the connecting portion 61 is connected to the base 11, the first extending portion 62 is connected to the side of the connecting portion 61 close to the radiation plate 5, the first extending portion 62 is bent and extended along the edge of the connecting portion 61 toward the side away from the base 11, and the second extending portion 63 is bent and extended along the edge of the first extending portion 62 away from the base 11, and resonance is generated through parasitic capacitance and inductance, thereby further ensuring the stability of the performance of the high and low dual-bands and the performance of the wide frequency band, and expanding the low-frequency impedance bandwidth.

[0036] The two coupling members 7 are circular structures of different sizes. The small-sized coupling member 7 is arranged on the inner wall of the outer cover 12 facing the base 11. Both of the coupling members 7 are circular to reduce edge effects, reduce unnecessary electromagnetic radiation and signal loss; in addition, the small-sized coupling member 7 is arranged on one side of the outer cover 12 to gather the beam of the wall-mounted antenna, improve the gain, and ensure the gain effect of high and low frequencies.

[0037] The clamping device 13 includes a fixed clamping member 15, a movable clamping member 16, an extension block 17 and a connecting groove 18. The connecting groove 18 is arranged on a side of the outer cover 12 close to the base 11. The fixed clamping member 15 is arranged on the connecting groove 18. The extension block 17 is arranged on one side of the movable clamping member 16. The width of the extension block 17 is greater than the width of the connecting groove 18. The extension block 17 is clamped on the inner side of the outer cover 12. The base 11 abuts against the bottom of the extension block 17. The fixed clamping member 15 and the movable clamping member 16 are clamped. The fixed clamping member 15 and the movable clamping member 16 are clamped on both sides of one end of the cable assembly 2. The fixed clamping member 15 includes a U-shaped sleeve 151, a first half sleeve 152 and two plug-in grooves 153. The U-shaped sleeve 151 is arranged on the connecting groove 18. The first half sleeve 152 is arranged on the inner top of the U-shaped ferrule 151, and the two plug-in grooves 153 are respectively arranged on both sides of the open end of the U-shaped ferrule 151. The movable clamping member 16 includes a spacer 161, a second half sleeve 162 and two plug-in blocks 163. The second half sleeve 162 is arranged on the top of the spacer 161 corresponding to the first half sleeve 152, and the two plug-in blocks 163 are respectively arranged on both sides of the spacer 161. The two plug-in blocks 163 are respectively plugged into the two plug-in grooves 153 one by one. By inserting the extension block 17 into the connecting groove 18, the base 11 abuts against the bottom of the extension block 17. When the base 11 and the outer cover 12 are connected, the fixing of the clamping device 13 is completed at the same time without additional fixing, which saves the assembly steps and improves the assembly efficiency.

[0038] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An indoor directional single-polarized wall-mounted antenna, characterized in that: The invention comprises a housing (1), a cable assembly (2), an impedance matching plate (3), a coaxial line (4), a radiating oscillator (5), two parasitic coupling plates (6), two coupling members (7) and a feeding assembly. The housing (1) comprises a base (11), an outer cover (12), a clamping device (13) and a suspension structure (14). The outer cover (12) is covered on the base (11), the clamping device (13) is arranged on one side of the outer cover (12), the suspension structure (14) is arranged on a side of the base (11) facing away from the outer cover (12), the radiating oscillator (5) is mounted on the base (11), and the impedance matching plate (3) is arranged adjacent to the radiating oscillator (5). On the base (11), the two parasitic coupling plates (6) are respectively arranged on the two sides of the base (11) relative to the radiation oscillator (5), the two coupling members (7) are arranged opposite to each other, any one of the coupling members (7) is mounted on the radiation oscillator (5), and the other coupling member (7) is arranged on the inner wall of the outer cover (12) facing the base (11), a spacing groove (51) is penetrated in the middle of the radiation oscillator (5), the feeding assembly is arranged on the radiation oscillator (5), the cable assembly (2) passes through the clamping device (13) and is connected to the impedance matching plate (3), and the two ends of the coaxial line (4) are respectively connected to the impedance matching plate (3) and the feeding assembly.

2. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: The feeding assembly comprises a first groove (52) and a first feeding plate (53), wherein the first groove (52) is arranged on a side of the radiating vibrator (5) opposite to the spacing groove (51), and the first feeding plate (53) is bent along a side of the first groove (52) close to the spacing groove (51), and the first feeding plate (53) is arranged parallel to a side of the radiating vibrator (5) facing the outer cover (12). The coaxial line (4) comprises a cylindrical braided mesh and an inner conductor, wherein the cylindrical braided mesh is sleeved on the outer side of the inner conductor, and the cylindrical braided mesh is connected to a side of the spacing groove (51) away from the first groove (52), and the inner conductor passes through the radiating vibrator (5) and is connected to the first feeding plate (53).

3. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: The feeding assembly comprises a second groove (54), a second feeding plate (55), a third groove (56) and a third feeding plate (57); the second groove (54) and the third groove (56) are respectively arranged on two sides of the radiation vibrator (5) relative to the spacing groove (51); the second feeding plate (55) is bent along a side of the second groove (54) close to the spacing groove (51); the third feeding plate (57) is bent and extended along a side of the third groove (56) close to the spacing groove (51); the second feeding plate (55) and the third feeding plate (57) are arranged oppositely on a side of the radiation vibrator (5) facing the base (11); the coaxial line (4) comprises a cylindrical braided mesh and an inner conductor; the cylindrical braided mesh is sleeved on the outer side of the inner conductor; the cylindrical braided mesh is connected to the second feeding plate (55); and the inner conductor passes through the second feeding plate (55) and is connected to the third feeding plate (57).

4. The indoor directional single-polarized wall-mounted antenna according to claim 3, characterized in that: The radiation vibrator (5) comprises a straight surface (58) and two inclined surfaces (59); the spacing groove (51) is arranged on the straight surface (58); the two inclined surfaces (59) are respectively bent along the two side edges of the straight surface (58) toward one side of the base (11); and the two inclined surfaces (59), the second feeding plate (55) and the third feeding plate (57) are arranged on the same straight line.

5. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: Both sides of the spacing groove (51) are connected with special-shaped expansion holes (50).

6. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: The two parasitic coupling plates (6) are respectively arranged on both sides of the radiating element (5) along the diagonal direction of the radiating element (5), and each parasitic coupling plate (6) is respectively arranged to be inclined relative to the plane direction where the feeding component is located.

7. The indoor directional single-polarized wall-mounted antenna according to claim 6, characterized in that: Each of the parasitic coupling plates (6) comprises a connecting portion (61), a first extending portion (62) and a second extending portion (63); the connecting portion (61) is connected to the base (11); the first extending portion (62) is connected to a side of the connecting portion (61) close to the radiation plate (5); the first extending portion (62) is bent and extended along an edge of the connecting portion (61) toward a side away from the base (11); and the second extending portion (63) is bent and extended along an edge of the first extending portion (62) away from the base (11).

8. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: The two coupling members (7) are circular structures of different sizes, and the coupling member (7) of small size is arranged on the inner wall of the outer cover (12) on the side facing the base (11).

9. The indoor directional single-polarized wall-mounted antenna according to claim 1, characterized in that: The clamping device (13) comprises a fixed clamping piece (15), a movable clamping piece (16), an extension block (17) and a connecting groove (18); the connecting groove (18) is arranged on a side of the outer cover (12) close to the base (11); the fixed clamping piece (15) is arranged on the connecting groove (18); the extension block (17) is arranged on one side of the movable clamping piece (16); the width of the extension block (17) is greater than the width of the connecting groove (18); the extension block (17) is clamped on the inner side of the outer cover (12); the base (11) abuts against the bottom of the extension block (17); the fixed clamping piece (15) and the movable clamping piece (16) are clamped; the fixed clamping piece (15) and the movable clamping piece (16) are clamped on both sides of one end of the cable assembly (2).

10. The indoor directional single-polarized wall-mounted antenna according to claim 9, characterized in that: The fixed clamping part (15) comprises a U-shaped clamping sleeve (151), a first half sleeve (152) and two plug-in grooves (153); the U-shaped clamping sleeve (151) is arranged on the connecting groove (18); the first half sleeve (152) is arranged on the inner top of the U-shaped clamping sleeve (151); the two plug-in grooves (153) are respectively arranged on both sides of the opening end of the U-shaped clamping sleeve (151); the movable clamping part (16) comprises a spacer (161), a second half sleeve (162) and two plug-in blocks (163); the second half sleeve (162) is arranged on the top of the spacer (161) corresponding to the first half sleeve (152); the two plug-in blocks (163) are respectively arranged on both sides of the spacer (161); and the two plug-in blocks (163) are respectively plugged into the two plug-in grooves (153) one by one.

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