CN213453178U

CN213453178U - Energy-saving lighting device for intelligent building

Info

Publication number: CN213453178U
Application number: CN202023106489.0U
Authority: CN
Inventors: 陈进荣; 黄秋月
Original assignee: Nanjing Zhengyuan Intelligent Technology Co ltd
Current assignee: Nanjing Zhengyuan Intelligent Technology Co ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-06-15
Anticipated expiration: 2030-12-22

Abstract

The utility model provides an energy-saving lighting device for smart buildings, which comprises a control box, a lampshade, a LED lamp, a light intensity sensor, an infrared proximity sensor and a mounting bracket; the infrared proximity sensor is fixedly arranged on the front side surface of the square seat; the light intensity sensor is fixedly arranged at the top of the control box; a circuit board is arranged in the control box, and a controller and an LED drive circuit are arranged on the circuit board; the controller is respectively electrically connected with the light intensity sensor, the infrared proximity sensor and the LED driving circuit; the LED drive circuit is electrically connected with the LED lamp. This an energy-conserving lighting device for wisdom building utilizes light intensity sensor can gather light intensity to when infrared proximity sensor detected infrared signal, pass through the luminance of LED drive circuit regulation LED lamp by the controller according to the light intensity of gathering, thereby effectively practice thrift the electric energy.

Description

Energy-saving lighting device for intelligent building

Technical Field

The utility model relates to a lighting device, especially an energy-conserving lighting device for wisdom building.

Background

At present, most of existing building lamps are manually controlled, people often forget to turn off the building lamps after the building lamps are used up, electric energy is wasted, and some building lamps are started by infrared induction, but the building lamps are started in the daytime or at night. Therefore, there is a need to design an energy-saving lighting device for smart buildings, which can adjust the brightness of the lamp according to the light intensity in the smart buildings, thereby effectively saving electric energy.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the energy-saving lighting device for the intelligent building can adjust the brightness of a lamp according to the light intensity in the building, so that electric energy is effectively saved.

In order to realize the purpose of the utility model, the utility model provides an energy-saving lighting device for intelligent buildings, which comprises a control box, a lamp shade, an LED lamp, a light intensity sensor, an infrared proximity sensor and a mounting bracket;

a rectangular concave groove is formed in the front side face of the control box; the infrared proximity sensor is fixedly arranged on the front side surface of a square seat, and a spherical hinge seat is arranged on the rear side surface of the square seat; a spherical hinge joint is arranged on the spherical hinge seat in a spherical hinge way; the spherical hinge joint is provided with a short connecting column which is fixedly arranged at the center of the front side surface of one sensing installation bottom plate, and the edge of the sensing installation bottom plate is provided with an independent installation hole; a side limit hole is formed in each of the left side and the right side of the sensing installation bottom plate; a transverse barrier strip is transversely arranged on the upper side groove wall and the lower side groove wall of the rectangular concave groove; the sensing installation bottom plate is vertically embedded and installed in the rectangular concave groove, and the upper side and the lower side of the rear side surface of the sensing installation bottom plate are respectively close to the upper transverse barrier strip and the lower transverse barrier strip; the square base and the infrared proximity sensor are positioned outside the rectangular concave groove; a buckle pin rod is transversely inserted on the left side and the right side of the control box, and the inner end part of the buckle pin rod extends into the rectangular recessed groove; an anti-skid convex ring is arranged at the outer end part of the buckle pin rod; a supporting convex ring is arranged in the middle of the buckle pin rod, and a buckle pressure spring is sleeved on the buckle pin rod; the buckle pressure spring is elastically supported between the support convex ring and the inner wall of the control box and is used for pushing the end part of the buckle pin rod to extend into the side limit hole on the corresponding side; the mounting bracket is fixedly mounted on the rear side surface of the control box and is used for fixedly mounting the control box on a building wall; the light intensity sensor is fixedly arranged at the top of the control box;

the front side edge of the top of the lampshade is provided with two lower hinged seats, and the front side edge of the bottom of the control box is provided with two upper hinged seats; the two lower hinged seats are respectively hinged with the two upper hinged seats; the LED lamp is fixedly arranged in the lampshade; a swinging hinging seat is arranged in the middle of the rear side edge of the top of the lampshade, and a connecting rod is arranged on the swinging hinging seat in a swinging hinging manner; an angle adjusting rod is longitudinally and rotatably arranged at the inner bottom of the control box, the front end of the angle adjusting rod extends out of the control box, and a cross-shaped handle is fixedly arranged at the front end part of the angle adjusting rod; an adjusting external thread is arranged on the angle adjusting rod; a strip-shaped hole is longitudinally formed in the bottom of the control box and below the angle adjusting rod; an adjusting slide block is arranged on the strip-shaped hole in a sliding mode, the upper side and the lower side of the adjusting slide block are respectively provided with a supporting clamping plate, and the two supporting clamping plates are clamped on the upper side face and the lower side face of the bottom of the control box; an adjusting support is arranged on the supporting clamping plate on the upper side, and an adjusting threaded hole is formed in the adjusting support; the angle adjusting rod is screwed on the adjusting threaded hole through adjusting external threads; an adjusting hinged support is arranged on the supporting and clamping plate at the lower side, and the upper end of the connecting rod is hinged on the adjusting hinged support;

a circuit board is arranged in the control box, and a controller and an LED drive circuit are arranged on the circuit board; the controller is respectively electrically connected with the light intensity sensor, the infrared proximity sensor and the LED driving circuit; the LED drive circuit is electrically connected with the LED lamp, and the controller adjusts the brightness of the LED lamp through the LED drive circuit.

Furthermore, a temperature sensor and a motor driving circuit which are electrically connected with the controller are arranged on the circuit board; the left side surface and the right side surface of the control box are respectively provided with a heat dissipation window, and the heat dissipation windows are provided with air filter screens; a heat radiation fan is arranged in the control box and positioned at the heat radiation window; the motor driving circuit is electrically connected with a driving motor of the cooling fan; the circuit board is isolated in the independent cavity by the vertical partition board in the control box; a heat dissipation block penetrates through the vertical partition plate, one side of the heat dissipation block is close to the heat dissipation fan, and the other side of the heat dissipation block is close to the circuit board.

Furthermore, a front guide column is longitudinally arranged in the rectangular recessed groove, and a strip-shaped guide groove is longitudinally arranged on the front guide column; a bobbin is sleeved on the front side guide post, and a strip-shaped guide sliding block which is embedded into the strip-shaped guide groove in a sliding manner is arranged on the inner wall of the bobbin; two ends of the bobbin are provided with limiting rings; and an electric connection cable of the controller and the infrared proximity sensor is wound on the bobbin.

Further, the mounting bracket comprises a positioning disc, a rear side disc, a positioning sleeve and a wall mounting plate; the positioning disc is fixed on the rear side surface of the control box, and a rear positioning column is longitudinally arranged at the center of the positioning disc; one end of the positioning sleeve is fixedly arranged at the center of the rear side surface of the rear side disc, and the other end of the positioning sleeve is fixedly arranged at the center of the front side surface of the wall mounting plate; a circular groove is formed in the front side face of the rear side disc, the rear side face of the positioning disc is embedded into the circular groove, and a rear side positioning column penetrates through the rear side disc and is then rotatably installed in the positioning sleeve; the circumferential edge of the positioning disc is provided with anti-slip ribs at intervals, the circumferential edge of the rear disc is provided with a positioning bolt in a threaded fit manner, and the end part of a screw rod of the positioning bolt is pressed on the anti-slip ribs.

The beneficial effects of the utility model reside in that: the light intensity sensor can be used for collecting the light intensity in the building, so that when the infrared proximity sensor detects an infrared signal, the controller adjusts the brightness of the LED lamp through the LED driving circuit according to the collected light intensity, and electric energy is effectively saved; the orientation angle of the lampshade can be adjusted by matching the cross-shaped handle, the angle adjusting rod, the adjusting support, the adjusting slide block and the connecting rod, so that the orientation of the lamplight can be adjusted according to the field requirement after installation; the infrared proximity sensor can be detachably mounted by utilizing the matching of the side limit hole, the buckle pin rod and the buckle pressure spring, so that whether the sensing mounting bottom plate needs to be taken down or not is determined according to the field mounting requirement, and the infrared proximity sensor is independently mounted; utilize the articulated cooperation of spherical articulated seat and spherical articulated head, can carry out angle modulation to the infrared proximity sensor after the installation.

Drawings

Fig. 1 is a front view of the present invention;

FIG. 2 is a schematic view of the right side of the control box according to the present invention;

fig. 3 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1-3, the utility model discloses an energy-saving lighting device for wisdom building includes: the device comprises a control box 1, a lampshade 7, an LED lamp 8, a light intensity sensor 6, an infrared proximity sensor 5 and a mounting bracket;

a rectangular concave groove 2 is arranged on the front side surface of the control box 1; the infrared proximity sensor 5 is fixedly arranged on the front side surface of a square seat 18, and a spherical hinge seat 19 is arranged on the rear side surface of the square seat 18; a spherical hinge joint 21 is arranged on the spherical hinge seat 19 in a spherical hinge way; a connecting short column 20 is arranged on the spherical hinge joint 21, the connecting short column 20 is fixedly arranged at the center of the front side surface of one sensing installation bottom plate 3, and an independent installation hole 4 is arranged at the edge of the sensing installation bottom plate 3; a side limit hole 44 is arranged on each of the left side and the right side of the sensing installation bottom plate 3; a transverse barrier strip 22 is transversely arranged on the upper side wall and the lower side wall of the rectangular concave groove 2; the sensing installation bottom plate 3 is vertically embedded and installed in the rectangular recessed groove 2, and the upper side and the lower side of the rear side of the sensing installation bottom plate 3 are respectively close to the upper transverse barrier strip 22 and the lower transverse barrier strip 22; the square seat 18 and the infrared proximity sensor 5 are positioned outside the rectangular concave groove 2; a buckle pin rod 14 is transversely inserted into the left side and the right side of the control box 1, and the inner end part of the buckle pin rod 14 extends into the rectangular recessed groove 2; an anti-skid convex ring 15 is arranged at the outer end part of the buckling pin rod 14; a supporting convex ring 16 is arranged in the middle of the buckling pin rod 14, and a buckling pressure spring 17 is sleeved on the buckling pin rod 14; the buckle pressure spring 17 is elastically supported between the support convex ring 16 and the inner wall of the control box 1 and is used for pushing the end part of the buckle pin rod 14 to extend into the side limit hole 44 on the corresponding side; the mounting bracket is fixedly mounted on the rear side surface of the control box 1 and is used for fixedly mounting the control box 1 on a building wall; the light intensity sensor 6 is fixedly arranged at the top of the control box 1;

the front side edge of the top of the lampshade 7 is provided with two lower hinged seats 9, and the front side edge of the bottom of the control box 1 is provided with two upper hinged seats 10; the two lower hinge seats 9 are respectively hinged with the two upper hinge seats 10; the LED lamp 8 is fixedly arranged in the lampshade 7; a swinging hinged seat 11 is arranged in the middle of the rear side edge of the top of the lampshade 7, and a connecting rod 12 is arranged on the swinging hinged seat 11 in a swinging hinged mode; an angle adjusting rod 27 is longitudinally and rotatably arranged on the inner bottom of the control box 1, the front end of the angle adjusting rod 27 extends out of the control box 1, and a cross-shaped handle 13 is fixedly arranged on the front end part of the angle adjusting rod 27; an adjusting external thread 28 is arranged on the angle adjusting rod 27; a strip-shaped hole 29 is longitudinally arranged on the bottom of the control box 1 and below the angle adjusting rod 27; an adjusting slider 30 is slidably mounted on the strip-shaped hole 29, a supporting clamping plate 31 is arranged on each of the upper side and the lower side of the adjusting slider 30, and the two supporting clamping plates 31 are clamped on the upper side and the lower side of the bottom of the control box 1; an adjusting support 32 is arranged on the supporting clamping plate 31 on the upper side, and an adjusting threaded hole is formed in the adjusting support 32; the angle adjusting rod 27 is screwed on the adjusting threaded hole through an adjusting external thread 28; an adjusting hinged support is arranged on the supporting and clamping plate 31 at the lower side, and the upper end of the connecting rod 12 is hinged on the adjusting hinged support;

a circuit board 42 is arranged in the control box 1, and a controller and an LED drive circuit are arranged on the circuit board 42; the controller is respectively and electrically connected with the light intensity sensor 6, the infrared proximity sensor 5 and the LED driving circuit; the LED drive circuit is electrically connected with the LED lamp 8, and the controller adjusts the brightness of the LED lamp 8 through the LED drive circuit.

The light intensity sensor 6 can be used for collecting the light intensity in the building, so that when the infrared proximity sensor 5 detects an infrared signal, the controller adjusts the brightness of the LED lamp 8 through the LED driving circuit according to the collected light intensity, and electric energy is effectively saved; the orientation angle of the lampshade 7 can be adjusted by matching the cross-shaped handle 13, the angle adjusting rod 27, the adjusting support 32, the adjusting slide block 30 and the connecting rod 12, so that the orientation of the lamplight can be adjusted according to the field requirement after installation; the infrared proximity sensor 5 can be detachably mounted by utilizing the matching of the side limiting hole 44, the buckle pin rod 14 and the buckle pressure spring 17, so that whether the sensing mounting base plate 3 needs to be taken down or not is determined according to the field mounting requirement, and the infrared proximity sensor 5 is independently mounted; the infrared proximity sensor 5 after being installed can be subjected to angle adjustment by utilizing the hinged fit of the spherical hinge seat 19 and the spherical hinge joint 21.

Further, a temperature sensor and a motor driving circuit electrically connected to the controller are provided on the circuit board 42; the left side surface and the right side surface of the control box 1 are respectively provided with a heat dissipation window, and the heat dissipation windows are provided with air filter screens 43; a heat radiation fan 39 is arranged in the control box 1 and positioned at the heat radiation window; the motor driving circuit is electrically connected with a driving motor of the cooling fan 39; the circuit board 42 is isolated in an independent cavity in the control box 1 through a vertical partition plate 41; a heat dissipation block 40 is arranged on the vertical partition plate 41 in a penetrating manner, and one side of the heat dissipation block 40 is close to the heat dissipation fan 39, and the other side is close to the circuit board 42. By the cooperation of the heat radiation fan 39 and the heat radiation block 40, the heat radiation performance of the control box 1 and the circuit board 42 can be enhanced; the air filter screen 43 can reduce the entry of sundries and dust into the control box 1;

further, a front guide post 25 is longitudinally arranged in the rectangular recessed groove 2, and a strip-shaped guide groove 26 is longitudinally arranged on the front guide post 25; a bobbin 23 is sleeved on the front guide post 25, and a strip-shaped guide slide block which is slidably embedded into a strip-shaped guide groove 26 is arranged on the inner wall of the bobbin 23; both ends of the bobbin 23 are provided with a limit ring 24; the electrical connection cable of the controller to the infrared proximity sensor 5 is wound around the bobbin 23. The electric connection cable of the infrared proximity sensor 5 can be wound by using the bobbin 23, so that the electric connection cable can be conveniently stored when the infrared proximity sensor 5 is not independently installed; the cooperation of the bar-shaped guide sliding block and the bar-shaped guide groove 26 is utilized to facilitate the pulling of the bobbin 23 for winding.

Further, the mounting bracket comprises a positioning disc 33, a rear side disc 35, a positioning sleeve 37 and a wall mounting plate 38; the positioning disc 33 is fixed on the rear side surface of the control box 1, and a rear positioning column is longitudinally arranged at the center of the positioning disc 33; one end of the positioning sleeve 37 is fixedly arranged at the center of the rear side face of the rear side disc 35, and the other end of the positioning sleeve 37 is fixedly arranged at the center of the front side face of the wall mounting plate 38; a circular groove is formed in the front side face of the rear side disc 35, the rear side face of the positioning disc 33 is embedded into the circular groove, and a rear positioning column penetrates through the rear side disc 35 and is installed in the positioning sleeve 37 in a rotating mode; the circumferential edge of the positioning disk 33 is provided with anti-slip ribs 34 at intervals, a positioning bolt 36 is screwed on the circumferential edge of the rear disk 35, and the end of the screw of the positioning bolt 36 is pressed on the anti-slip ribs 34. By matching the positioning disc 33 and the circular groove, the positioning bolt 36 positions the rotating angle, so that the adjustment can be conveniently carried out according to the field installation condition; the stability of the positioning can be enhanced by the anti-slip projected ridges 34.

The utility model discloses an among the energy-conserving lighting device for wisdom building: the controller adopts the existing single chip microcomputer control module, such as a 51 single chip microcomputer module, and is used for realizing the receiving and transmitting control of signals; the light intensity sensor 6 adopts the existing light intensity sensor and is used for collecting the light intensity in real time; the infrared proximity sensor 5 adopts the existing infrared proximity sensor and is used for detecting infrared signals in a monitoring area in real time; the LED driving circuit adopts the existing LED driving circuit and is used for controlling the brightness of the LED lamp 8 according to the control signal of the controller; the temperature sensor adopts the existing temperature sensor and is used for detecting the temperature; the motor drive circuit adopts an existing motor drive circuit for driving the motor of the cooling fan 39.

The utility model discloses an energy-conserving lighting device for wisdom building when the installation uses: firstly, the energy-saving lighting device is installed on the wall of a building through an installation bracket, then the rotation angle of the positioning disc 33 is adjusted, and positioning and locking are carried out through the positioning bolt 36; the orientation angles of the lampshade 7 and the LED lamp 8 are adjusted by rotating the angle adjusting rod 27; whether the infrared proximity sensor 5 is independently installed or not is determined according to the field requirement, if the infrared proximity sensor 5 is independently installed, the two buckling pin rods 14 are pulled out, the sensing installation bottom plate 3 is taken out, the winding tube 23 is pulled out, the electric connection cable is laid down, then the sensing installation bottom plate 3 is independently installed, and if the infrared proximity sensor 5 does not need to be directly adjusted in orientation angle; when the LED lamp is used, the light intensity sensor 6 detects the light intensity in a building in real time, when the infrared proximity sensor 5 detects that an infrared signal exists in an area, a PWM driving signal of the LED driving circuit is set according to the light intensity, and then the LED driving circuit adjusts the brightness of the LED lamp 8 to illuminate the building.

As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides an energy-conserving lighting device for wisdom building which characterized in that: the device comprises a control box (1), a lampshade (7), an LED lamp (8), a light intensity sensor (6), an infrared proximity sensor (5) and a mounting bracket;

a rectangular concave groove (2) is arranged on the front side surface of the control box (1); the infrared proximity sensor (5) is fixedly arranged on the front side surface of a square seat (18), and a spherical hinge seat (19) is arranged on the rear side surface of the square seat (18); a spherical hinge joint (21) is arranged on the spherical hinge seat (19) in a spherical hinge way; a connecting short column (20) is arranged on the spherical hinge joint (21), the connecting short column (20) is fixedly arranged at the center of the front side surface of one sensing installation bottom plate (3), and an independent installation hole (4) is arranged at the edge of the sensing installation bottom plate (3); a side limit hole (44) is arranged on each of the left side and the right side of the sensing installation bottom plate (3); a transverse barrier strip (22) is transversely arranged on the upper side wall and the lower side wall of the rectangular concave groove (2); the sensing installation bottom plate (3) is vertically embedded and installed in the rectangular recessed groove (2), and the upper side and the lower side of the rear side surface of the sensing installation bottom plate (3) are respectively close to the upper transverse barrier strip and the lower transverse barrier strip (22); the square seat (18) and the infrared proximity sensor (5) are positioned outside the rectangular concave groove (2); a buckle pin rod (14) is transversely inserted into the left side and the right side of the control box (1), and the inner end part of the buckle pin rod (14) extends into the rectangular recessed groove (2); an anti-skid convex ring (15) is arranged at the outer end part of the buckling pin rod (14); a supporting convex ring (16) is arranged in the middle of the buckle pin rod (14), and a buckle pressure spring (17) is sleeved on the buckle pin rod (14); the buckle pressure spring (17) is elastically supported between the support convex ring (16) and the inner wall of the control box (1) and is used for pushing the end part of the buckle pin rod (14) to extend into the side limit hole (44) on the corresponding side; the mounting bracket is fixedly mounted on the rear side surface of the control box (1) and is used for fixedly mounting the control box (1) on a building wall; the light intensity sensor (6) is fixedly arranged at the top of the control box (1);

two lower hinged seats (9) are arranged on the front side edge of the top of the lampshade (7), and two upper hinged seats (10) are arranged on the front side edge of the bottom of the control box (1); the two lower hinged seats (9) are respectively hinged with the two upper hinged seats (10); the LED lamp (8) is fixedly arranged in the lampshade (7); a swinging hinged seat (11) is arranged in the middle of the rear side edge of the top of the lampshade (7), and a connecting rod (12) is mounted on the swinging hinged seat (11) in a swinging and hinged mode; an angle adjusting rod (27) is longitudinally and rotatably arranged on the inner bottom of the control box (1), the front end of the angle adjusting rod (27) extends out of the control box (1), and a cross-shaped handle (13) is fixedly arranged on the front end part of the angle adjusting rod (27); an adjusting external thread (28) is arranged on the angle adjusting rod (27); a strip-shaped hole (29) is longitudinally arranged on the bottom of the control box (1) and below the angle adjusting rod (27); an adjusting slide block (30) is slidably mounted on the strip-shaped hole (29), the upper side and the lower side of the adjusting slide block (30) are respectively provided with a supporting clamping plate (31), and the two supporting clamping plates (31) are clamped on the upper side and the lower side of the bottom of the control box (1); an adjusting support (32) is arranged on the supporting clamping plate (31) on the upper side, and an adjusting threaded hole is formed in the adjusting support (32); the angle adjusting rod (27) is screwed on the adjusting threaded hole through an adjusting external thread (28); an adjusting hinged support is arranged on the supporting and clamping plate (31) at the lower side, and the upper end of the connecting rod (12) is hinged on the adjusting hinged support;

a circuit board (42) is arranged in the control box (1), and a controller and an LED drive circuit are arranged on the circuit board (42); the controller is respectively and electrically connected with the light intensity sensor (6), the infrared proximity sensor (5) and the LED driving circuit; the LED drive circuit is electrically connected with the LED lamp (8), and the controller adjusts the brightness of the LED lamp (8) through the LED drive circuit.

2. The energy-saving lighting device for intelligent buildings according to claim 1, wherein: a temperature sensor and a motor driving circuit which are electrically connected with the controller are arranged on the circuit board (42); the left side surface and the right side surface of the control box (1) are respectively provided with a heat dissipation window, and an air filter screen (43) is arranged on the heat dissipation windows; a heat radiation fan (39) is arranged in the control box (1) and positioned at the heat radiation window; the motor driving circuit is electrically connected with a driving motor of the cooling fan (39); the circuit board (42) is isolated in the independent cavity by a vertical clapboard (41) in the control box (1); a heat dissipation block (40) penetrates through the vertical partition plate (41), one side of the heat dissipation block (40) is close to the heat dissipation fan (39), and the other side of the heat dissipation block is close to the circuit board (42).

3. The energy-saving lighting device for intelligent buildings according to claim 1, wherein: a front guide post (25) is longitudinally arranged in the rectangular concave groove (2), and a strip-shaped guide groove (26) is longitudinally arranged on the front guide post (25); a bobbin (23) is sleeved on the front guide post (25), and a strip-shaped guide sliding block which is embedded into a strip-shaped guide groove (26) in a sliding manner is arranged on the inner wall of the bobbin (23); two ends of the bobbin (23) are provided with a limiting ring (24); an electric connection cable of the controller and the infrared proximity sensor (5) is wound on the bobbin (23).

4. The energy-saving lighting device for intelligent buildings according to claim 1, wherein: the mounting bracket comprises a positioning disc (33), a rear side disc (35), a positioning sleeve (37) and a wall mounting plate (38); the positioning disc (33) is fixed on the rear side surface of the control box (1), and a rear positioning column is longitudinally arranged at the center of the positioning disc (33); one end of a positioning sleeve (37) is fixedly arranged at the center of the rear side surface of the rear side disc (35), and the other end of the positioning sleeve (37) is fixedly arranged at the center of the front side surface of the wall mounting plate (38); a circular groove is formed in the front side face of the rear side disc (35), the rear side face of the positioning disc (33) is embedded into the circular groove, and a rear positioning column penetrates through the rear side disc (35) and then is rotatably installed in the positioning sleeve (37); the circumferential edge of the positioning disc (33) is provided with anti-skid convex ribs (34) at intervals, the circumferential edge of the rear disc (35) is provided with a positioning bolt (36) in a threaded manner, and the end part of the screw rod of the positioning bolt (36) is pressed on the anti-skid convex ribs (34).