Communication antenna with protection structure

Abstract

The application relates to the technical field of antennas, in particular to a communication antenna with a protection structure. The cooperation of the detection rod two and the detection rod one can be used to detect the angle of the support column body in real time, so that whether the support column body is tilted can be found in time; if the support column body is tilted, the detection rod one and the detection rod two can be fixed after being closely attached, so that the support column body can be assisted and supported, the stability of the support column body is increased, the time for worker maintenance is saved, and in the detection process, the position of the detection rod two can be changed in real time, so that the overall detection of the support column body can be realized, and the detection accuracy is improved; and in the process of angle detection, vibration force is simultaneously generated on the knocking rod one and the knocking rod two, so that the antenna receiving end is vibrated, the animals such as birds staying on the antenna receiving end are driven away, the use of the antenna is avoided from being affected, and sundries on the antenna receiving end can also be dropped, so that the normal use of the antenna is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and particularly relates to a communication antenna with a protection structure. BACKGROUND

[0002] The communication antenna is a device for transmitting and receiving radio signals, and is a crucial component in a communication system, and is used for realizing information transmission on a radio frequency band.

[0003] The communication antenna is generally installed at a high position to ensure the accuracy of received signals, but at the high position, the rod body of the antenna needs to bear strong wind force for a long time, which can easily cause the whole antenna to tilt, affecting use, but since high-altitude operation is dangerous, workers cannot conveniently perform maintenance in daily life, so that it is not possible to timely learn whether the antenna has tilted, and it is also not possible to correct and protect the tilted antenna. SUMMARY

[0004] The present application aims to provide a communication antenna with a protection structure to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a communication antenna with a protection structure, comprising an antenna receiving end and a support column body, the antenna receiving end is hingedly arranged at the end of the support column body, a detection ring is arranged on the outer wall of the support column body, and an auxiliary ring is arranged on the outer side of the detection ring;

[0006] A detection rod one is arranged on the side wall of the detection ring in an elastically connected manner, a detection rod two is arranged on the auxiliary ring, the detection rod two is in contact with the end of the detection rod one during movement, the support column body is angle-detected when the detection rod two moves the detection rod one, and the support column body is corrected and supported when the detection rod two is relatively fixed with the detection rod one;

[0007] a transmission assembly is arranged between the detection ring and the auxiliary ring, the transmission assembly is used for driving the detection ring and the auxiliary ring to rotate in the same direction, and a support rod is connected to the outer wall of the auxiliary ring;

[0008] a driving assembly is arranged on the outer wall of the antenna receiving end, and the driving assembly is used for causing the antenna receiving end to vibrate.

[0009] Further, the end of the detection rod one is provided with a bevel one, the end of the detection rod two is provided with a bevel two, the bevel one and the bevel two are matched, and an inductive sensor one is arranged on the bevel one and the bevel two, the inductive sensor one sends a signal one when the bevel one is attached to the bevel two, and the inductive sensor one sends a signal two when the bevel one is separated from the bevel two.

[0010] Further, a groove one matched with the detection rod one is arranged on the detection ring, the detection rod one extends to the inside of the groove one, a spring one is arranged on the side wall of the detection rod one, the end of the spring one is fixedly connected with the side wall of the groove one, an induction sensor two is arranged in the inside of the groove one, and the induction sensor two sends a signal three when the end of the detection rod one is attached to the inner wall of the groove one.

[0011] Further, a control module is arranged, the control module receives the signal one, the signal two and the signal three, records the time node of receiving the signal two as T1, records the time node of receiving the signal three as T2, judges that the support column body does not tilt if the time nodes of T1 and T2 are the same, and judges that the support column body tilts if the time nodes of T1 and T2 are different.

[0012] Further, an insertion slot is arranged on the side wall of the detection rod one, an insertion piece in sliding connection is arranged in the inside of the detection ring, the insertion piece is matched with the insertion slot, an electromagnet is arranged above the insertion piece in the inside of the detection ring, and a magnet block is arranged in the insertion piece;

[0013] When the electromagnet is powered on, the insertion piece is above the insertion slot;

[0014] When the electromagnet is powered off, the insertion piece is inserted into the insertion slot, and the detection rod one cannot move.

[0015] Further, the transmission assembly comprises a transmission rod, the transmission rod is connected with the output shaft of the driving motor, a driving gear is arranged on the outer wall of the transmission rod, an annular rack one is arranged on the outer wall of the auxiliary ring, the driving gear is engaged with the annular rack one, a sector gear is arranged on the outer wall of the transmission rod, and an annular rack two is arranged on the outer wall of the detection ring, and the annular rack two is engaged with the sector gear.

[0016] Further, an annular groove is arranged on the outer wall of the support column body, a ratchet wheel is arranged in the inside of the annular groove, and a pawl matched with the ratchet wheel is arranged on the inner wall of the detection ring.

[0017] Further, the driving assembly comprises an adjusting ring, the adjusting ring is rotatably arranged on the outer wall of the antenna receiving end, a hinged knocking rod one and a knocking rod two are arranged on the adjusting ring, an elastically hinged knocking rod is arranged on the outer wall of the support column body, and the knocking rod produces a knocking force on the knocking rod one and the knocking rod two.

[0018] Further, the dialing rod is hinged with the support column through a rotating shaft, the rotating shaft is located between two end portions of the dialing rod, a torsional spring is arranged on the rotating shaft, the torsional spring is used for controlling the reset of the dialing rod, a transmission ring is arranged on the outer wall of the support column, the transmission ring is connected with the auxiliary ring, a dialing tooth is arranged on the outer wall of the transmission ring, the dialing tooth is in contact with one end portion of the dialing rod in the rotating process, and the other end portion of the dialing rod is in contact with the knock rod one and the knock rod two.

[0019] Further, the knock rod two end portion is provided with a hinged connecting seat one, the knock rod one end portion is provided with a hinged connecting seat two, the connecting seat one and the connecting seat two are fixedly connected with the adjusting ring, and the connecting seat one is internally provided with a bearing ball.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1、The present application can detect the angle of the support column in real time through the cooperation of the detection rod two and the detection rod one, so that whether the support column is inclined can be found in time, and if the support column is inclined, the detection rod one and the detection rod two can be fixed after being closely attached, so that the support column can be assisted and supported, the stability of the support column is increased, the time for worker maintenance is saved, and in the detection process, the position of the detection rod two can be changed in real time, so that the overall detection of the support column can be realized, and the detection accuracy is improved.

[0022] 2、In the process of angle detection, the knock rod one and the knock rod two also generate vibration force, so that the antenna receiving end generates vibration, animals such as birds are driven away, the use of the antenna is avoided from being affected, and sundries on the antenna receiving end can also fall off, so that the normal use of the antenna is ensured. DETAILED DESCRIPTION

[0023] Figure 1 It is a structural schematic view of the whole application;

[0024] Figure 2 It is a structural schematic view of the first angle of the whole application;

[0025] Figure 3 It is an enlarged structural schematic view of position A in the application; Figure 2

[0026] Figure 4 It is a structural schematic view of the second angle of the whole application;

[0027] Figure 5 It is an enlarged structural schematic view of position B in the application; Figure 4

[0028] Figure 6 ​​The schematic diagram of the side sectional structure of the whole application;

[0029] Figure 7 The schematic diagram of the sectional structure of the support column of the application; Figure 6 The schematic diagram of the enlarged structure at C in the application;

[0030] Figure 8 The schematic diagram of the sectional structure of the support column of the application;

[0031] In the figure: 1, the antenna receiving end; 2, the support column; 3, the detection ring; 4, the auxiliary ring; 5, the detection rod one; 6, the detection rod two; 7, the transmission assembly; 71, the transmission rod; 72, the driving motor; 73, the driving gear; 74, the annular rack one; 75, the sector gear; 76, the annular rack two; 77, the ratchet wheel; 78, the pawl; 8, the support rod; 9, the driving assembly; 91, the adjusting ring; 92, the knocking rod one; 93, the knocking rod two; 94, the knocking rod; 95, the rotating shaft; 96, the transmission ring; 97, the knocking gear; 98, the connecting seat two; 99, the connecting seat one; 910, the bearing ball; 10, the inclined plane one; 11, the inclined plane two; 12, the groove one; 13, the spring one; 14, the insertion slot; 15, the insertion piece; 16, the electromagnet. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0033] Embodiment: as shown in the figure, the application provides a communication antenna with a protection structure, which comprises an antenna receiving end 1 and a support column 2, the antenna receiving end 1 is hingedly arranged at the end of the support column 2, the outer wall of the support column 2 is sleeved with a detection ring 3, and the outer side of the detection ring 3 is sleeved with an auxiliary ring 4; Figures 1-8 The side wall of the detection ring 3 is provided with an elastically connected detection rod one 5, the auxiliary ring 4 is provided with a detection rod two 6, the detection rod two 6 is in contact with the end of the detection rod one 5 during movement, and when the detection rod two 6 pushes the detection rod one 5 to move, the angle of the support column 2 is detected, and when the detection rod two 6 is relatively fixed with the detection rod one 5, the support column 2 is corrected and supported;

[0034] and a transmission assembly 7, the transmission assembly 7 is arranged between the detection ring 3 and the auxiliary ring 4, the transmission assembly 7 is used for driving the detection ring 3 and the auxiliary ring 4 to rotate in the same direction, and the outer wall of the auxiliary ring 4 is connected with a support rod 8;

[0035] ​

[0036] And a driving component 9 is arranged on the outer wall of the antenna receiving end 1, and the driving component 9 is used to make the antenna receiving end 1 vibrate.

[0037] The end of the detection rod one 5 is provided with a slope one 10, the end of the detection rod two 6 is provided with a slope two 11, the slope one 10 and the slope two 11 are matched, and the slope one 10 and the slope two 11 are provided with an induction sensor one, when the slope one 10 and the slope two 11 are attached, the induction sensor one sends a signal one, and when the slope one 10 and the slope two 11 are separated, the induction sensor one sends a signal two.

[0038] Specifically, when the detection rod one 5 rotates, the end of the slope one 10 gradually contacts the slope two 11 and sends a signal one, at this time, the detection rod two 6 is pushed to move, when the detection rod one 5 moves between the two detection rod two 6, the slope one 10 and the slope two 11 are separated, a signal two is sent, and the detection rod two 6 is automatically reset.

[0039] The detection ring 3 is provided with a groove one 12 matched with the detection rod one 5, the end of the detection rod one 5 extends to the inside of the groove one 12, the side wall of the detection rod one 5 is provided with a spring one 13, the end of the spring one 13 is fixedly connected with the side wall of the groove one 12, and the inside of the groove one 12 is provided with an induction sensor two, when the end of the detection rod one 5 is attached to the inner wall of the groove one 12, the induction sensor two sends a signal three.

[0040] Specifically, when the detection rod one 5 pushes the detection rod two 6 to move, the end of the detection rod two 6 is inserted into the inside of the groove one 12, in a preferred embodiment, the spring one 13 is arranged in the slot on the side wall of the detection rod two 6, as the detection rod two 6 is pushed in, finally, the end of the detection rod two 6 is attached to the inner wall of the groove one 12, at this time, a signal three is sent, and the detection rod two 6 cannot be continuously pushed.

[0041] The control module receives the signal one, the signal two and the signal three, records the time node of receiving the signal two as T1, and records the time node of receiving the signal three as T2, if the time nodes of T1 and T2 are the same, it is judged that the support column body 2 does not tilt, and if the time nodes of T1 and T2 are different, it is judged that the support column body 2 tilts.

[0042] The side wall of the detection rod one 5 is provided with an insertion slot 14, the inside of the detection ring 3 is provided with a slidingly connected insertion piece 15, the insertion piece 15 is matched with the insertion slot 14, the inside of the detection ring 3 is provided with an electromagnet 16 above the insertion piece 15, and the insertion piece 15 is provided with a magnet block;

[0043] When the electromagnet 16 is powered on, the electromagnet 16 generates a magnetic force, which is attracted to the magnet block in the insertion piece 15, thereby driving the insertion piece 15 to move upwards, so that the insertion piece 15 is located above the insertion slot 14;

[0044] When the electromagnet 16 is powered off, the electromagnet 16 cannot be attracted to the magnet block, and under the action of gravity, the insertion piece 15 will fall, eventually inserting the end of the insertion piece 15 into the insertion slot 14. The insertion of the insertion piece 15 into the insertion slot 14 will limit the movement of the detection rod 1, so that the detection rod 1 cannot move. In a preferred embodiment, the insertion piece 15 can be connected with the return spring, and when it falls, the return spring will generate a certain pushing force on the insertion piece 15, so that the insertion piece 15 is more accurately inserted into the insertion slot 14.

[0045] The transmission assembly 7 comprises a transmission rod 71 connected with the output shaft of the driving motor 72, a driving gear 73 sleeved on the outer wall of the transmission rod 71, an annular rack 74 provided on the outer wall of the auxiliary ring 4, the driving gear 73 and the annular rack 74 being engaged with each other, a sector gear 75 sleeved on the outer wall of the transmission rod 71, an annular rack 76 provided on the outer wall of the detection ring 3, the annular rack 76 and the sector gear 75 being engaged with each other, and a ring groove provided on the outer wall of the support column 2, a ratchet wheel 77 provided inside the ring groove, and a pawl 78 provided on the inner wall of the detection ring 3 and matched with the ratchet wheel 77.

[0046] Specifically, the driving motor 72 is started, the output shaft of the driving motor 72 drives the transmission rod 71 to rotate, the transmission rod 71 drives the driving gear 73 to rotate, the driving gear 73 drives the engaged annular rack 74 to rotate, the annular rack 74 drives the auxiliary ring 4 to rotate, the detection rod 2 on the auxiliary ring 4 rotates, thereby controlling the detection rod 2 to cooperate with the detection rod 1, and the direction of rotation of the detection rod 2 is opposite to the one-way rotation direction of the ratchet wheel 77 and the pawl 78, so as to ensure that the detection rod 1 will not drive the detection ring 3 to rotate when pushing the detection rod 2 to move, thereby affecting the use, and the transmission rod 71 also drives the sector gear 75 to rotate, the sector gear 75 has fewer teeth, and every time the sector gear 75 rotates one period, the sector gear 75 will engage with the annular rack 76 to drive the annular rack 76 to rotate, at this time, the annular rack 76 drives the detection wheel to rotate, and since the sector gear 75 has fewer teeth, it can only drive the annular rack 76 to rotate a small angle, and at the same time, the detection wheel also rotates a small angle, which changes the position of the detection rod 1 and adjusts the relative position between the detection rod 1 and the support column 2, thereby detecting the angles of the support column 2 in all directions.

[0047] The driving component 9 comprises an adjusting ring 91 which is rotatably arranged on the outer wall of the antenna receiving end 1, and the adjusting ring 91 is provided with a hinged knock lever one 92 and a hinged knock lever two 93, the outer wall of the support column 2 is provided with an elastically hinged knock lever 94 which generates a knocking force on the knock lever one 92 and the knock lever two 93; the knock lever 94 is hinged to the support column 2 through a rotating shaft 95, the rotating shaft 95 is located between the two end portions of the knock lever 94, and the rotating shaft 95 is provided with a torsional spring which is used to control the reset of the knock lever 94, the outer wall of the support column 2 is provided with a transmission ring 96 which is connected with the auxiliary ring 4, and the outer wall of the transmission ring 96 is provided with a knock tooth 97 which is in contact with one end portion of the knock lever 94 in the rotating process, and the other end portion of the knock lever 94 is in contact with the knock lever one 92 and the knock lever two 93; the end portion of the knock lever two 93 is provided with a hinged connecting seat one 99, and the end portion of the knock lever one 92 is provided with a hinged connecting seat two 98, the connecting seat one 99 and the connecting seat two 98 are fixedly connected with the adjusting ring 91, and the inside of the connecting seat one 99 is provided with a bearing ball 910, and the weight of the connecting seat one 99 is greater than the weight of the connecting seat two 98.

[0048] Specifically, when the auxiliary ring 4 rotates, the transmission ring 96 will be driven to rotate, the knock tooth 97 will be driven to rotate, and the knock tooth 97 will be in contact with the knock lever 94 in the rotating process and drive the knock lever 94 to be hinged, when the knock tooth 97 is separated from the knock lever one 92 and the knock lever two 93, the knock lever 94 will be quickly reset under the action of the torsional spring, and one end of the knock lever 94 will knock the knock lever one 92 and the knock lever two 93 in the resetting process, when the above operation is repeated, the knock lever one 92 and the knock lever two 93 will generate a vibration force, so that the antenna receiving end 1 generates a vibration force, and the animals such as birds are driven away, and the sundries on the antenna receiving end can also fall off, so as to ensure the normal use of the antenna.

[0049] When the angle of the antenna receiving end 1 is adjusted, since the weight of the connecting seat one 99 plus the bearing ball 910 is greater than that of the connecting seat two 98, and under the action of gravity, the connecting seat one 99 will automatically move to the position where the antenna receiving end 1 is downwardly inclined, so that the connecting seat one 99 is always located at the lowest end, and since the connecting seat one 99 and the connecting seat two 98 are connected with the adjusting ring 91, the connecting seat two 98 is located in the symmetrical direction of the connecting seat one 99, that is, the high point of the antenna receiving end 1, so that the knock lever one 92 and the knock lever two 93 are distributed on both sides of the antenna receiving end 1, and finally the generated vibration force can be dispersed, rather than being limited to a certain part, so as to expand the monitoring range.

[0050] The working principle of the present application is as follows: in the use of the antenna, the control driving motor 72 is started, so that the auxiliary ring 4 can rotate, and the auxiliary ring 4 will drive the detection rod two 6 to rotate in the rotating process, because the slope of the detection rod two 6 and the slope of the end of the detection rod one 5 are matched, so the detection rod one 5 will be pushed inward, the time point when the slope of the detection rod one 5 and the slope of the detection rod two 6 are separated, and the time point when the detection rod one 5 and the inner wall of the groove are completely matched, if the time points of the two are the same, it shows that the support column body 2 does not tilt, if the time points of the two are not the same, it shows that the detection rod two 6 will push the detection rod one 5 to move in the case that the detection rod one 5 has matched the inner wall, so as to prove that the support column body 2 tilts at this time, and the time node of signal three is marked on the time axis between signal one and signal two, after intercepting the front section, the time period between the time node of signal three and the time node of signal two is left, and the inclination is calculated according to the rotation rate and the Pythagorean theorem, when the inclination reaches the set threshold value, the current of the electromagnet 16 is disconnected at this time, the insertion piece 15 is inserted into the insertion slot 14, and the detection rod one 5 is limited and fixed, after the end of the detection rod two 6 and the end of the detection rod one 5 are completely matched, continue to rotate, it will push the support column body 2 to move through the detection rod two 6, correct it, make it vertical, stop the rotation of the driving motor 72, at this time, the support column body 2 is supported and fixed, and the stability of the support column body 2 is increased.

[0051] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description presented above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the features to which the reference signs are attached. The application covers all the modifications and variations of this application falling within the scope of the appended claims.

Claims

1. A communication antenna having a protective structure, characterized by: The utility model relates to an antenna receiving end (1) and support column (2) are included, the antenna receiving end (1) is hinged to be located support column (2) end, support column (2) outer wall is equipped with detection ring (3), detection ring (3) outside is equipped with auxiliary ring (4), Detection ring (3) side wall is equipped with the detection rod one (5) of elastic connection, auxiliary ring (4) is equipped with detection rod two (6), detection rod two (6) contact with the end of detection rod one (5) in the moving process, when detection rod two (6) push detection rod one (5) and move, to support column (2) angle detection, when detection rod two (6) and detection rod one (5) relative fixed, to support column (2) correction support, And transmission assembly (7), transmission assembly (7) are located between detection ring (3) with auxiliary ring (4), transmission assembly (7) are used for driving detection ring (3) with auxiliary ring (4) same direction rotation, auxiliary ring (4) outer wall is connected with support rod (8), And drive component (9), drive component (9) are located support column (2) outer wall, drive component (9) are used for making antenna receiving end (1) produce vibration, Detection rod one (5) end is equipped with bevel one (10), detection rod two (6) end is equipped with bevel two (11), bevel one (10) with bevel two (11) match, bevel one (10) with bevel two (11) are equipped with inductive sensor one, when bevel one (10) and bevel two (11) adhere, inductive sensor one sends out signal one, when bevel one (10) and bevel two (11) separate, inductive sensor one sends out signal two, Detection ring (3) is equipped with recess one (12) with detection rod one (5) match, detection rod one (5) end extends to recess one (12) inside, detection rod one (5) side wall is equipped with spring one (13), spring one (13) end with recess one (12) side wall fixed connection, recess one (12) inside is equipped with inductive sensor two, when detection rod one (5) end and recess one (12) inner wall adhere, inductive sensor two sends out signal three, Still include control module, control module receives signal one, signal two and signal three, and the time node that receives signal two is recorded as T1, the time node that receives signal three is recorded as T2, if T1 and T2 time node are same, then judge support column (2) do not occur inclination, if T1 and T2 time node are not same, then judge support column (2) occur inclination.

2. The communication antenna with a protection structure according to claim 1, characterized in that: Detection rod one (5) side wall is equipped with insertion slot (14), detection ring (3) inside is equipped with the insertion piece (15) of sliding connection, insertion piece (15) with insertion slot (14) match, detection ring (3) inside is located insertion piece (15) top and is equipped with electromagnet (16), insertion piece (15) inside is equipped with magnet block; When the electromagnet (16) is powered on, the insertion piece (15) is above the insertion slot (14); When the electromagnet (16) is powered off, the insertion piece (15) is inserted into the insertion slot (14), and the detection rod (5) cannot be moved.

3. The communication antenna with a protection structure according to claim 1, characterized in that: The transmission assembly (7) comprises a transmission rod (71), the transmission rod (71) is connected with the output shaft of the driving motor (72), the transmission rod (71) is provided with a driving gear (73) on the outer wall, the auxiliary ring (4) is provided with an annular rack (74) on the outer wall, the driving gear (73) is engaged with the annular rack (74), the transmission rod (71) is provided with a sector gear (75) on the outer wall, the detection ring (3) is provided with an annular rack (76) on the outer wall, and the annular rack (76) is engaged with the sector gear (75).

4. The communication antenna with a protection structure according to claim 1, characterized in that: The support column (2) is provided with an annular groove on the outer wall, the annular groove is provided with a ratchet wheel (77) inside, and the detection ring (3) is provided with a pawl (78) matched with the ratchet wheel (77) on the inner wall.

5. The communication antenna with a protection structure according to claim 1, characterized in that: The driving assembly (9) comprises an adjusting ring (91), the adjusting ring (91) is rotatably arranged on the outer wall of the antenna receiving end (1), the adjusting ring (91) is provided with a hinged knocking rod (92) and a knocking rod (93), the support column (2) is provided with an elastically hinged knocking rod (94) on the outer wall, and the knocking rod (94) generates a knocking force on the knocking rod (92) and the knocking rod (93).

6. The communication antenna with a protection structure according to claim 5, characterized in that: The knocking rod (94) is hinged to the support column (2) through a rotating shaft (95), the rotating shaft (95) is located between the two end portions of the knocking rod (94), a torsional spring is arranged on the rotating shaft (95), the torsional spring is used for controlling the reset of the knocking rod (94), a transmission ring (96) is arranged on the outer wall of the support column (2), the transmission ring (96) is connected with the auxiliary ring (4), the transmission ring (96) is provided with a knocking tooth (97) on the outer wall, the knocking tooth (97) is in contact with one end portion of the knocking rod (94) in the rotating process, and the other end portion of the knocking rod (94) is in contact with the knocking rod (92) and the knocking rod (93).

7. The communication antenna with a protection structure according to claim 5, characterized in that: The knocking rod (93) is provided with a hinged connecting seat (99) on the end portion, the knocking rod (92) is provided with a hinged connecting seat (98) on the end portion, the connecting seat (99) and the connecting seat (98) are fixedly connected with the adjusting ring (91), the connecting seat (99) is provided with a bearing ball (910) in the inside, and the weight of the connecting seat (99) is greater than that of the connecting seat (98).

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