CN114371476A

CN114371476A - 300GHz radar sensor and cigarette holder bead detection system

Info

Publication number: CN114371476A
Application number: CN202111670474.3A
Authority: CN
Inventors: 黄高昂
Original assignee: Chinasimba Electronic Co ltd
Current assignee: Chinasimba Electronic Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-19

Abstract

The invention discloses a 300GHz radar sensor and a detection system for a cigarette holder bead, which comprise a shell and a support frame, wherein the shell is hollow inside, a detection component and a circuit board component are arranged inside the shell, the detection component is arranged at the front end of the shell, the circuit board component is arranged at the rear end of the shell, and the shell penetrates through an inner cavity of the support frame and is in threaded connection with the support frame; the detection assembly comprises a lens frame, the lens frame is installed inside the shell in a compression joint mode, a lens antenna is installed on the lens frame, the circuit board assembly comprises a circuit board three-dimensional component which is formed by splicing six circuit boards and is similar to a cuboid, a front end circuit board of the circuit board three-dimensional component is connected with an integrated chip, and a rear end circuit board of the circuit board three-dimensional component is connected with an interface socket.

Description

300GHz radar sensor and cigarette holder bead detection system

Technical Field

The invention relates to the technical field of radar sensors, in particular to a 300GHz radar sensor and a detection system for a cigarette holder bead.

Background

The millimeter wave radar sensor has important application in the fields of automatic driving, industrial measurement, micro-distance detection, hidden object detection and the like. Compared with other products with lower working frequency, the radar sensor with the working frequency of 289 GHz-329 GHz (hereinafter referred to as 300GHz) is shorter in wavelength, smaller in beam angle, more concentrated in energy, better in distance resolution precision and angle resolution precision, and meanwhile, the short wavelength also provides a foundation for high integration of the products.

The bead blasting is placed in the cigarette holder, which is the development trend of the tobacco industry at present, and the production detection link is indispensable for eliminating cigarettes without bead blasting through factory detection of the bead blasting in the cigarette holder so as to improve the quality of products. In the prior art, the detection process of the cigarette holder popping beads is generally completed by photographing and imaging after the cigarettes are irradiated by strong light and then identifying and processing the images. In the method, when the cigarette holder is wrapped by the gold foil paper and contains the filter cotton, the effective detection of the popping beads cannot be realized. In this case, the cigarette holder needs to be photographed and imaged by X-rays and then processed and detected. The adoption of the X-ray can involve the problems of using and maintaining the radiation source, the operation and maintenance cost is increased, and risk points of radiation pollution and leakage exist, so that enterprises need to accept or reject the risks. Based on the above, the invention designs a 300GHz radar sensor and a detection system of the cigarette holder bead to solve the above problems.

Disclosure of Invention

The invention aims to provide a 300GHz radar sensor and a detection system of a popping bead of a cigarette, so as to solve the technical problems.

In order to achieve the purpose, the invention provides the following technical scheme: a300 GHz radar sensor comprises a shell and a supporting frame, wherein the shell is hollow inside, a detection assembly and a circuit board assembly are arranged inside the shell, the detection assembly is arranged at the front end of the shell, the circuit board assembly is arranged at the rear end of the shell, and the shell penetrates through an inner cavity of the supporting frame and is in threaded connection with the supporting frame;

the detection assembly comprises a lens frame, the lens frame is arranged in the shell in a compression joint mode, a lens antenna is arranged on the lens frame, the lens antenna is a high-resistance silicon plano-convex lens antenna, and the lens antenna is close to the front end of the shell;

the circuit board assembly comprises a circuit board three-dimensional component formed by splicing six circuit boards into a cuboid, a front end circuit board of the circuit board three-dimensional component is connected with an integrated chip, a distance is arranged between the integrated chip and a lens antenna, and a rear end circuit board of the circuit board three-dimensional component is connected with an interface socket.

Preferably, the circuit board assembly further comprises an insulation bushing and a tail bushing, the insulation bushing is sleeved on the outer wall of the circuit board three-dimensional component, the tail bushing is sleeved at the rear end of the circuit board three-dimensional component, and the circuit board three-dimensional component is installed inside the shell through the insulation bushing and the tail bushing.

Preferably, the circuit board three-dimensional component comprises a radio frequency circuit board, an interface circuit board, a first radar signal processing circuit board, a second radar signal processing circuit board, a third radar signal processing circuit board and a fourth radar signal processing circuit board, wherein the radio frequency circuit board, the interface circuit board, the first radar signal processing circuit board, the second radar signal processing circuit board, the third radar signal processing circuit board and the fourth radar signal processing circuit board are welded with each other to form a cuboid-like structure, the radio frequency circuit board is connected with an integrated chip, and the interface circuit board is connected with an interface socket.

Preferably, the rear end of the shell is detachably connected with a tail cover through threads, and a connecting port matched with the interface socket is formed in the tail cover.

Preferably, the outer wall of the shell is provided with external threads, the outer wall of the shell is in threaded connection with two groups of locking rings, and the two groups of locking rings are respectively positioned on two sides of the support frame.

Preferably, the support frame includes bottom plate and riser, the riser is installed at the bottom plate top perpendicularly, the riser runs through and sets up the screw hole of mutually supporting with the shell, the mounting hole has been seted up to the bottom plate, and the mounting hole is located the bottom plate four corners.

The utility model provides a cigarette holder detection system that explodes pearl, includes 300GHz radar sensor and cigarette conveyer belt, the cigarette that awaits measuring has been placed on the cigarette conveyer belt, be equipped with the distance between 300GHz radar sensor and the cigarette conveyer belt, and 300GHz radar sensor's front end towards the cigarette conveyer belt, the interface socket of 300GHz radar sensor rear end is pegged graft and is had the signal line, and 300GHz radar sensor passes through the signal line and is connected with outside computer processing system electricity.

Preferably, the cigarette holder further comprises an adjustable base, the adjustable base is installed at the bottom of the support frame of the 300GHz radar sensor, and the adjustable base is used for adjusting the height and the levelness of the 300GHz radar sensor so that the 300GHz radar sensor can keep a concentric state with the cigarette to be measured.

Preferably, the adjustable base includes the mounting panel, the position rigid coupling that the mounting panel top corresponds the bottom plate mounting hole has first nut, first nut inner chamber spiro union has the bolt, the bottom plate mounting hole inner chamber is passed at the bolt top, bolt outer wall spiro union has second nut and third nut, the second nut is with bottom plate bottom butt, third nut and bottom plate top looks butt.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the 300GHz radar sensor, the lens frame, the lens antenna, the circuit board three-dimensional component, the integrated chip and the interface socket are efficiently integrated into the shell, so that a high-integration-level miniaturized millimeter wave radar product is formed, and the industrial design of the 300GHz radar sensor is realized;

2. the 300GHz radar sensor is applied to a detection system of the cigarette holder popping bead, and the 300GHz electromagnetic wave has high frequency, short wavelength and wide frequency band, so that sufficient resolution can be provided to ensure the detection precision of the popping bead; meanwhile, because the beam angle is small and the energy is concentrated, the anti-interference energy is stronger, and because the 300GHz electromagnetic wave belongs to non-ionizing radiation, the risk of pollution or leakage of an ionizing radiation source of X-rays is avoided, and extra cost is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic front view of the structure of FIG. 2;

FIG. 4 is a schematic structural diagram of a three-dimensional component of the circuit board according to the present invention;

FIG. 5 is a schematic structural diagram of a three-dimensional circuit board structure and its connecting components according to the present invention;

FIG. 6 is a schematic structural view of a pop-top detection system of the present invention;

FIG. 7 is a schematic structural diagram of the 300GHz radar sensor of the invention after being installed with an adjustable base;

fig. 8 is an enlarged view of the structure at a in fig. 7.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a housing; 2. a support frame; 21. a base plate; 22. a vertical plate; 3. a lens holder; 4. a lens antenna; 5. a circuit board three-dimensional member; 51. a radio frequency circuit board; 52. an interface circuit board; 53. a first radar signal processing circuit board; 54. a second radar signal processing circuit board; 55. a third radar signal processing circuit board; 56. a fourth radar signal processing circuit board; 6. an integrated chip; 7. an interface socket; 8. an insulating bushing; 9. a tail bushing; 10. a tail cover; 11. locking a ring; 12. a cigarette conveyor; 13. an adjustable base; 131. mounting a plate; 132. a first nut; 133. a bolt; 134. a second nut; 135. and a third nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: a300 GHz radar sensor comprises a shell 1 and a supporting frame 2 which are hollow inside, wherein a detection assembly and a circuit board assembly are arranged inside the shell 1, the detection assembly is arranged at the front end of the shell, the circuit board assembly is arranged at the rear end of the shell 1, and the shell 1 penetrates through an inner cavity of the supporting frame 2 and is in threaded connection with the supporting frame 2;

the detection assembly comprises a lens frame 3, the lens frame 3 is arranged in the shell 1 in a compression joint mode, a lens antenna 4 is arranged on the lens frame 3, the lens antenna 4 is a high-resistance silicon plano-convex lens antenna, and the lens antenna 4 is close to the front end of the shell 1;

the circuit board assembly comprises a circuit board three-dimensional component 5 which is formed by splicing six circuit boards into a cuboid, a front end circuit board of the circuit board three-dimensional component 5 is connected with an integrated chip 6, a distance is arranged between the integrated chip 6 and the lens antenna 4, and a rear end circuit board of the circuit board three-dimensional component 5 is connected with an interface socket 7.

Specifically, the circuit board assembly further comprises an insulating bush 8 and a tail bush 9, the insulating bush 8 is sleeved on the outer wall of the circuit board three-dimensional component 5, the tail bush 9 is sleeved at the rear end of the circuit board three-dimensional component 5, the circuit board three-dimensional component 5 is installed inside the shell 1 through the insulating bush 8 and the tail bush 9, and the insulating bush and the tail bush are made of polytetrafluoroethylene materials, so that certain elasticity is achieved, and the circuit board assembly is convenient to install.

Specifically, the circuit board three-dimensional component 5 comprises a radio frequency circuit board 51, an interface circuit board 52, a first radar signal processing circuit board 53, a second radar signal processing circuit board 54, a third radar signal processing circuit board 55 and a fourth radar signal processing circuit board 56, wherein the radio frequency circuit board 51, the interface circuit board 52, the first radar signal processing circuit board 53, the second radar signal processing circuit board 54, the third radar signal processing circuit board 55 and the fourth radar signal processing circuit board 56 are welded with each other to form a cuboid-like structure, the radio frequency circuit board 51 is connected with the integrated chip 6, the interface circuit board 52 is connected with the interface socket 7, the design reduces the occupied space, simultaneously forms a stable connection structure, the composition of each part also meets the actual board surface arrangement requirement, does not need additional signal wires or power wires for connection, and reduces the installation process requirement, and the miniaturization of the product is realized.

Specifically, shell 1 rear end screw thread releasable connection has tail-hood 10, and the connector that mutually supports with interface socket 7 is seted up to tail-hood 10, thereby the tail-hood is removable can take out interior device.

Specifically, the outer wall of the shell 1 is provided with external threads, the outer wall of the shell 1 is in threaded connection with two groups of locking rings 10, and the two groups of locking rings 11 are respectively positioned on two sides of the support frame 2.

Specifically, support frame 2 includes bottom plate 21 and riser 22, and riser 22 is installed perpendicularly at bottom plate 21 top, and riser 22 runs through and sets up the screw hole of mutually supporting with shell 1, and the mounting hole has been seted up to bottom plate 21, and the mounting hole is located bottom plate 21 four corners, can fix whole radar sensor on application platform.

The utility model provides a cigarette holder bead detection system, includes 300GHz radar sensor and cigarette conveyer belt 12, has placed the cigarette that awaits measuring on the cigarette conveyer belt 12, is equipped with the distance between 300GHz radar sensor and the cigarette conveyer belt 12, and 300GHz radar sensor's front end towards cigarette conveyer belt 12, and the interface socket 7 of 300GHz radar sensor rear end is pegged graft and is had the signal line, and 300GHz radar sensor passing signal line is connected with outside computer processing system electricity.

Specifically, still include adjustable base, adjustable base 13 is installed in 2 bottoms of support frame of 300GHz radar sensor, and adjustable base 13 is used for adjusting 300GHz radar sensor's height and levelness make 300GHz radar sensor can keep concentric state with the cigarette that awaits measuring.

Specifically, the adjustable base 13 includes a mounting plate 131, a first nut 132 is fixedly connected to a position of the top of the mounting plate 131 corresponding to the mounting hole of the bottom plate 21, a bolt 133 is screwed to an inner cavity of the first nut 132, the top of the bolt 133 penetrates through the inner cavity of the mounting hole of the bottom plate 21, a second nut 134 and a third nut 135 are screwed to an outer wall of the bolt 133, the second nut 134 abuts against the bottom of the bottom plate 21, and the third nut 135 abuts against the top of the bottom plate 21.

A specific application example of the present embodiment is shown in fig. 1 to 7:

as shown in FIG. 1, FIG. 2 and FIG. 3, the detection front end of the 300GHz radar sensor is composed of a lens antenna 4, a lens frame 3 and a radar front end integrated chip 6 (the integrated chip 6 contains an on-chip integrated antenna, an antenna coupler, a mixer, a frequency multiplier, a power amplifier, a splitter, an oscillator, a frequency divider and other functional circuits, which are used in cooperation with an external phase-locked loop circuit to form a radar front end system, the radar front end system is divided into a transmitting link and a receiving link, a 75GHz radio frequency signal directly generated by the oscillator is converted into a 150GHz radio frequency signal through the splitter and respectively enters the transmitting link and the receiving link, the signal energy is increased through the power amplifier, and the frequency conversion to 300GHz is completed through the frequency multiplier, the radio frequency signal in the transmitting link is coupled into the integrated antenna through the antenna coupler and radiated outwards, and in the receiving link, the radio frequency signal generated by the oscillator, amplified and converted to 300GHz is transmitted to a zero beat frequency mixer as a local oscillation signal The radio frequency signals radiated by the transmitting link and reflected by the integrated antenna through the antenna coupler are subjected to mixed down-conversion to obtain intermediate frequency output signals; the oscillator, the 32 frequency divider and an external phase-locked loop circuit form a feedback adjusting circuit, the Frequency Modulation Continuous Wave (FMCW) radar working mode can be realized through the control of an externally input tuning signal, and the Continuous Wave (CW) radar working mode can be realized if the frequency of the oscillator is fixed; the lens antenna 4 is fixed on the lens frame 3 and keeps a fixed micro distance with the radar front end integrated chip 6 installed on the circuit board three-dimensional component 5, the lens frame 3 is installed inside the shell 1 and is fixed with the shell 1 in a crimping mode, in the installation process of the lens antenna 4, an optical method is needed to be adopted to carry out accurate positioning according to the lens antenna, good matching of the antenna on the integrated chip 6 and the lens antenna 4 can be achieved, and the stability of the performance of the radar sensor is guaranteed. The circuit board three-dimensional component 5 is formed by splicing six circuit boards into a cuboid form so as to realize the miniaturization of products. The periphery of the outer side of the circuit board three-dimensional component 5 is provided with an insulating bush 8 which fixes the circuit three-dimensional component 5 inside the shell 1 together with a tail bush 9 and a tail cover 10. The other end of the tail cover 10 is provided with a connecting hole, which can be connected with a USB connector or replaced into other connecting interface forms according to requirements. The outer side of the shell 1 is provided with threads, the threads can be connected with the support frame 2 and fixed by the locking ring 11, and the support frame 2 is provided with a mounting hole for connection, so that the whole radar sensor can be fixed on an application platform. According to actual requirements, an extended antenna or other additional devices can be conveniently connected to the shell 1.

As shown in fig. 4, the circuit board three-dimensional member 5 is composed of six circuit boards, the six circuit boards are spliced into a cuboid shape to reduce the volume of the product, and the splicing positions of the circuit boards are fixed and communicated with the circuit in a welding mode. The radar front end integrated chip 6 is arranged on the front end radio frequency circuit board 51, and the USB interface socket is arranged on the interface circuit board 52;

as shown in fig. 5, 6 and 7, the 300GHz radar sensor, the cigarette to be detected, the cigarette conveyor belt 12 and the adjustable base 13 form a detection part in the detection system of the popping bead of the cigarette; the height and the levelness of the 300GHz radar sensor can be adjusted by the adjustable base 13, so that the 300GHz radar sensor can keep a concentric state with the cigarettes to be detected in the cigarette conveying belt 12 and keep a specific distance, and electromagnetic wave beams can just penetrate through the cigarette holder part of the 300GHz radar sensor; during adjustment: the second nut 134 and the third nut 135 at the four mounting hole positions of the bottom plate 21 are respectively rotated, so that the bottom plate 21 can slide up and down along the bolt 133, thereby adjusting the height and levelness of the 300GHz radar sensor; then the 300GHz radar sensor is electrically connected with an external computer processing system through a signal line, so that the information obtained by detection can be transmitted to the computer processing system through the signal line for rapid processing, cigarettes with leaked blasting beads are removed through linkage of a follow-up device, and the closed loop of production detection is completed.

The performance and the working principle of the 300GHz radar sensor are as follows: the 300GHz radar sensor has a high working frequency band, the wavelength of the radar sensor reaches 1mm, and basically reaches a millimeter wave high band, and the radar sensor begins to show the characteristics of a submillimeter wave quasi-optical system. The working bandwidth reaches 40GHz, and for FMCW radar sensors, the working bandwidth and the detection precision are closely related. Meanwhile, under the same condition, the radar sensor with higher frequency can achieve higher resolution and has higher sensitivity to the tiny distance change of the measured object;

for industrial measurement, compared with a low-frequency product, the 300GHz radar sensor can realize a smaller radar beam angle under the same caliber, so that better performance can be realized in a narrow space where other products are difficult to realize performance;

for the detection system of the cigarette holder popping beads, firstly, as the filter cotton is a fluffy non-metallic solid, the filter cotton has a low relative dielectric constant, is easy to penetrate through high-frequency-band electromagnetic waves such as millimeter waves and the like, and basically does not influence the electromagnetic wave beams; the popping beads are liquid sealed by plastic, have larger relative dielectric constant, larger contrast difference with filter cotton and more obvious reflection phenomenon to electromagnetic waves, so that 300GHz electromagnetic waves can penetrate through the filter cotton wrapping the popping beads and cannot penetrate through the popping beads, and the detection of the cigarette holder popping beads is realized;

the 300GHz electromagnetic wave has high frequency, short wavelength and wide frequency band, and has enough resolution to ensure the detection precision of the blasting beads; meanwhile, the beam angle is small, the energy is concentrated, and the anti-interference energy is stronger; meanwhile, because the 300GHz electromagnetic wave belongs to non-ionizing radiation, the risk of pollution or leakage of an ionizing radiation source like X-rays is avoided, and additional cost is avoided.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A300 GHz radar sensor, characterized by: the detection device comprises a shell (1) and a support frame (2) which are hollow inside, wherein a detection assembly and a circuit board assembly are arranged inside the shell (1), the detection assembly is arranged at the front end of the shell, the circuit board assembly is arranged at the rear end of the shell (1), and the shell (1) penetrates through the inner cavity of the support frame (2) and is in threaded connection with the support frame (2);

the detection assembly comprises a lens frame (3), the lens frame (3) is installed inside the shell (1) in a compression joint mode, a lens antenna (4) is installed on the lens frame (3), the lens antenna (4) is a high-resistance silicon plano-convex lens antenna, and the lens antenna (4) is close to the front end of the shell (1);

the circuit board assembly comprises a circuit board three-dimensional component (5) formed by splicing six circuit boards into a cuboid, a front end circuit board of the circuit board three-dimensional component (5) is connected with an integrated chip (6), a distance is arranged between the integrated chip (6) and a lens antenna (4), and a rear end circuit board of the circuit board three-dimensional component (5) is connected with an interface socket (7).

2. A 300GHz radar sensor according to claim 1, wherein: the circuit board assembly further comprises an insulation bushing (8) and a tail bushing (9), the outer wall of the circuit board three-dimensional component (5) is sleeved with the insulation bushing (8), the rear end of the circuit board three-dimensional component (5) is sleeved with the tail bushing (9), and the circuit board three-dimensional component (5) is installed inside the shell (1) through the insulation bushing (8) and the tail bushing (9).

3. A 300GHz radar sensor according to claim 1, wherein: the circuit board three-dimensional component (5) comprises a radio frequency circuit board (51), an interface circuit board (52), a first radar signal processing circuit board (53), a second radar signal processing circuit board (54), a third radar signal processing circuit board (55) and a fourth radar signal processing circuit board (56), wherein the radio frequency circuit board (51), the interface circuit board (52), the first radar signal processing circuit board (53), the second radar signal processing circuit board (54), the third radar signal processing circuit board (55) and the fourth radar signal processing circuit board (56) are mutually welded to form a cuboid-like structure, the radio frequency circuit board (51) is connected with an integrated chip (6), and the interface circuit board (52) is connected with an interface socket (8).

4. A 300GHz radar sensor according to claim 1, wherein: the rear end of the shell (1) is in threaded detachable connection with a tail cover (10), and a connecting port matched with the interface socket (7) is formed in the tail cover (10).

5. A 300GHz radar sensor according to claim 1, wherein: the outer wall of the shell (1) is provided with external threads, the outer wall of the shell (1) is in threaded connection with two groups of locking rings (11), and the two groups of locking rings (11) are respectively positioned on two sides of the support frame (2).

6. A 300GHz radar sensor according to claim 1, wherein: the support frame (2) includes bottom plate (21) and riser (22), install at bottom plate (21) top perpendicularly riser (22), riser (22) run through set up with shell (1) screw hole of mutually supporting, the mounting hole has been seted up in bottom plate (21), and the mounting hole is located bottom plate (21) four corners.

7. The utility model provides a cigarette holder explodes pearl detecting system which characterized in that: the cigarette conveying belt (12) and the 300GHz radar sensor as claimed in any one of claims 1-6, wherein a cigarette to be detected is placed on the cigarette conveying belt (12), a distance is arranged between the 300GHz radar sensor and the cigarette conveying belt (12), the front end of the 300GHz radar sensor faces the cigarette conveying belt (12), a signal line is plugged into an interface socket (7) at the rear end of the 300GHz radar sensor, and the 300GHz radar sensor is electrically connected with an external computer processing system through the signal line.

8. A pop-top detection system as recited in claim 7, wherein: still include adjustable base, adjustable base (13) are installed in 300GHz radar sensor's support frame (2) bottom, adjustable base (13) are used for adjusting 300GHz radar sensor's height and levelness make 300GHz radar sensor can keep concentric state with the cigarette that awaits measuring.

9. A pop-top detection system as recited in claim 8, wherein: adjustable base (12) include mounting panel (131), the position rigid coupling that mounting panel (131) top corresponds bottom plate (21) mounting hole has first nut (132), first nut (132) inner chamber spiro union has bolt (133), bottom plate (21) mounting hole inner chamber is passed at bolt (133) top, bolt (133) outer wall spiro union has second nut (134) and third nut (135), second nut (134) and bottom plate (21) bottom looks butt, third nut (135) and bottom plate (21) top looks butt.