CN109017645A - A kind of high efficiency buffer system based on elastic component - Google Patents
A kind of high efficiency buffer system based on elastic component Download PDFInfo
- Publication number
- CN109017645A CN109017645A CN201810843366.3A CN201810843366A CN109017645A CN 109017645 A CN109017645 A CN 109017645A CN 201810843366 A CN201810843366 A CN 201810843366A CN 109017645 A CN109017645 A CN 109017645A
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- Prior art keywords
- guide
- pressure sensor
- spring
- connect
- rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/023—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
Abstract
The high efficiency buffer system based on elastic component that the invention discloses a kind of, including controller, fixing seat, U-shaped guide part and transmitting assembly, guide part middle part and flat part, one end on flat part far from middle part is provided with pneumatic cylinder, it is provided with guide groove on the inner concave of middle part, is provided with sequentially connected pressure sensor and transmitting spring at the both ends of guide groove；Transmitting assembly includes telescopic rod and support ring, telescopic rod includes moving cylinder, energy-storaging spring and mobile bar, one end of mobile bar is hingedly arranged there are two guide rod, guide pad is provided with close to one end of middle part on the guide bar, guide pad is inserted into guide groove, and respectively transmits the end thereof contacts on spring far from pressure sensor with one respectively；Controller is connect with the driving motor of pneumatic cylinder and pressure sensor.Impact force is transferred to other directions by the present invention, is then weakened the whole impact force size born in impact direction of automobile, is protected car body.
Description
Technical field
The present invention relates to automotive fields, and in particular to a kind of high efficiency buffer system based on elastic component.
Background technique
Automobile itself there is power to be driven, be not necessary to set up according to track or electric power, be able to the vehicle of powered travel.
Automobile is generally made of four essential parts such as engine, chassis, vehicle body and electrical equipment.Body of a motor car is mounted on the vehicle on chassis
On frame, cargo is taken or loaded to driver, passenger.Car, car vehicle body be usually overall structure, truck body is general
It is made of driver's cabin and container two parts.
Automotive body structure specifically includes that bodyshell, car door, vehicle window, Chinese herbaceous peony metal plate product, vehicle body internal and external ornament part and vehicle
Body attachment, seat and ventilation, heating, cold air, conditioner etc..Wherein, bodyshell is all car body components
Installation foundation, typically refers to the main load-bearing component such as longitudinal and transverse beam and pillar and the metal plate part that is connected with them collectively constitutes
Rigid space structure.Bus body majority has apparent skeleton, and coachbuilt body and truck cab are then without apparent bone
Frame.Bodyshell also typically includes the materials such as the sound insulation laid on it, heat-insulated, vibrationproof, anti-corrosion, sealing and coating.Outside vehicle body
Portion's decoration is primarily referred to as ornamental strip, wheel disk, mark and sculptured text etc..Radiator grill, bumper, anticollision
The attachmentes such as beam, lamps and lanterns and rearview mirror also have apparent dicoration.
In the traffic accident of automobile, collision is a kind of accident form for being easiest to occur.After low speed collision generation, vapour
The colliding part meeting Inward deflection of vehicle, therefore the often bumper or collision prevention girders in colliding part setting for buffering.It is existing
Buffer unit is divided into hard buffering equipment and soft buffering equipment.Hard buffering equips the plastic deformation by itself, to protect vehicle body not
It is damaged；Soft buffering equipment mainly absorbs energy by the flexible deformation of itself, then protects vehicle sound injury-free.It is existing soft
Energy conversion effect is undesirable when in use for buffering equipment, and impact force can only be carried out to longitudinal absorption, can not be transferred into it
He can only damage car body to eliminate impact force, be unfavorable for the protection of car body in direction when longitudinally absorbing endless impact force.And incite somebody to action
When the buffer path of soft buffering equipment increases its absorbent impact force of increase, then it can greatly increase its volume, be unfavorable for
The traffic traveling of automobile is parked and aesthetics.
Summary of the invention
The high efficiency buffer system based on elastic component that it is an object of that present invention to provide a kind of, solving existing soft buffering equipment makes
Used time energy conversion effect is undesirable, and impact force can only be carried out to longitudinal absorption, other directions can not be transferred into, work as longitudinal direction
When absorbing endless impact force, the problem of car body can only be damaged to eliminate impact force, be unfavorable for the protection of car body.
The present invention is achieved through the following technical solutions:
A kind of high efficiency buffer system based on elastic component, including controller and sequentially connected fixing seat, U-shaped guide part
And transmitting assembly, wherein
The guide part includes arc-shaped middle part and two flat parts, the arcuate surface and fixing seat of the middle part
Connection, the flat part are respectively connect with the end of a middle part respectively, and one end on flat part far from middle part is respectively provided with
There is pneumatic cylinder, the axis of the pneumatic cylinder is parallel to the center line of guide part, and cylinder bottom is connect with flat part, piston-rod end
It is directed away from the direction of flat part, the contour of middle part is provided with guide groove on the inner concave of middle part, in guide groove
Both ends be provided with sequentially connected pressure sensor and transmitting spring, the pressure sensor is fixed on the end of guide groove
Portion, and pressure sensor can acquire the pressure information from transmitting spring；
The transmitting assembly is located at the inside of guide part comprising elastic telescopicing rod and support ring, the axis of the telescopic rod
Line is overlapped with the center line of guide part, and telescopic rod includes moving cylinder, energy-storaging spring and the mobile bar for being sequentially connected simultaneously coaxial line, institute
It states support ring to be set in moving cylinder, is provided with support arm on a pair of of opposite outer walls of support ring, it is separate on the support arm
One end of support ring is respectively connect with a flat part respectively, in the centre bore of one end insertion moving cylinder of the mobile bar, and is led to
The bottom hole for crossing energy-storaging spring and centre bore connects, the other end of mobile bar hingedly be arranged there are two guide rod, the hinged axis
Line is provided with guide pad close to one end of middle part on the guide bar perpendicular to the U-shaped face of guide part, and the guide pad is inserted
Enter in guide groove, and respectively transmits the end thereof contacts on spring far from pressure sensor with one respectively；
Magnet is provided on the face relative to each other of guide rod, the magnet repels one another so that the axis of guide rod is equal
Acute angle is formed with the axis of transmitting assembly, spring is transmitted at this time and is in ortho states；
The controller is connect with the driving motor of pneumatic cylinder and pressure sensor, and pressure sensor is collected
Pressure information be sent to controller, controller receives the information from pressure sensor, and controls the work shape of driving motor
State.
In use, fixing seat is mounted on the face for being also easy to produce collision, one end direction in moving cylinder far from mobile bar is touched
Hit source.When colliding, moving cylinder is first contacted with collision source, and impact force acts directly in moving cylinder, then energy-storaging spring
It is compressed, as energy-storaging spring is compressed, the part energy of impact force is converted in energy-storaging spring, and another part energy pushes
Telescopic rod is whole mobile to middle part, while guide rod is rotated around hinged axis, guide rod under the movement of telescopic rod
Therewith away from each other, guide pad is moved along the cell wall of guide groove to corresponding transmitting spring, and is compressed for separate hinged one end
Spring is transmitted, the conversion of a part of impact force is carried out, and as transmitting spring is compressed, telescopic rod can continue to middle part
It is mobile, then continue conversion and falls a part of impact force.During transmitting spring is compressed, pressure sensor is triggered, and
Its collected pressure information from transmitting spring is sent into controller, controller receives the information from pressure sensor
Afterwards, start pneumatic cylinder, then make its piston rod top to collision source, generate a power opposite with impact, then offset a part
Impact force.
Controller, pressure sensor and controller control driving motor, the working method for receiving pressure sensor are
The prior art.
The present invention can not only be carried out impact force come multiple positions by the compression of energy-storaging spring and the movement of telescopic rod
It is longitudinal to absorb, and can also be turned impact force by components such as guide pads by the rotation of guide rod and the compression of transmitting spring
Other directions are moved on to, the whole impact force size born in impact direction of automobile, when preventing impact force larger, car body are then weakened
Generate damage；And a power opposite with impact can also be generated, a part of impact force is then offset by starting pneumatic cylinder；
Simultaneously, moreover it is possible to which, by transmitting spring, while increasing the buffer path of impact force, buffer unit increases on impact force direction
Length be far smaller than the increased length of buffer path, then control buffer unit entirety volume, then guarantee automobile friendship
It is current to sail, park and aesthetics.
Simultaneously magnet setting so that the present invention be in when work state, the axis of guide rod always with transmitting assembly
Axis forms acute angle, is then conducive to the present invention when buffering, and guide pad can be successfully along the cell wall of guide groove to right
The transmitting spring answered is mobile, without generating guide rod close to the axis of transmitting assembly and contacting with each other, and causes in this position
Movement dead is generated, guide pad is not easy to and occurs along the situation that cell wall moves.
Further, stiffening plate is provided between the arcuate surface and fixing seat of the middle part, the stiffening plate is straight
Angle triangle, one right-angle side are connect with fixing seat, bevel edge indent camber, and are connect with the arcuate surface of middle part, and its
Radius is consistent with the evagination radius surface of middle part, and there are two stiffening plates, and along the center line central symmetry of guide part.
The setting of stiffening plate increases the stability that middle part is fixed in fixing seat.
Further, the middle part and fixing seat are welded with stiffening plate.
Further, the guide part is integrally formed.
Compared with prior art, the present invention having the following advantages and benefits:
1, a kind of high efficiency buffer system based on elastic component of the present invention, passes through the compression of energy-storaging spring and the shifting of telescopic rod
Impact force is carried out longitudinal absorption by dynamic next multiple positions, and can also be by the rotation of guide rod and the compression of transmitting spring, will
Impact force is transferred to other directions by components such as guide pads, and it is big then to weaken the whole impact force born in impact direction of automobile
Small, when preventing impact force larger, car body generates damage；And can also be by starting pneumatic cylinder, generation one is opposite with impact
Power then offsets a part of impact force；
2, a kind of high efficiency buffer system based on elastic component of the present invention, by transmitting spring, in the buffering for increasing impact force
While path, buffer unit increased length on impact force direction is far smaller than the increased length of buffer path, then controls
The volume of buffer unit entirety processed then guarantees the traffic traveling of automobile, parks and aesthetics；
3, a kind of high efficiency buffer system based on elastic component of the present invention, the setting of magnet, so that the present invention is in work shape
When state, the axis of guide rod forms acute angle with the axis of transmitting assembly always, when then buffering conducive to the present invention, leads
It can successfully be moved to block along the cell wall of guide groove to corresponding transmitting spring, without generating guide rod close to transmitting assembly
Axis and contact with each other, and cause this position generate movement dead, be not easy to guide pad and go out along the situation that cell wall moves
It is existing.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is main view of the invention；
Fig. 3 is cross section structure schematic diagram figure of the invention；
Fig. 4 is the structural schematic diagram when present invention absorbs impact power.
Label and corresponding parts title in attached drawing:
1- fixing seat, 2- guide part, 3- middle part, 4- flat part, 5- guide groove, 6- transmit spring, 7- moving cylinder, and 8- stores
Can spring, 9- mobile bar, 10- guide rod, 11- guide pad, 12- magnet, 13- pressure sensor, 14- allows pneumatic cylinder, and 15- reinforces
Plate, 16- contact plate, 17- internal screw thread cylinder, 18- limiting slot, 19- spacing ball, 20- support ring, 21- support arm.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
As Figure 1-Figure 4, a kind of high efficiency buffer system based on elastic component of the present invention, including controller and successively connect
Fixing seat 1, U-shaped guide part 2 and the transmitting assembly connect, wherein
The guide part 2 includes arc-shaped middle part 3 and two flat parts 4, the arcuate surface of the middle part 3 and solid
Reservation 1 connects, and the flat part 4 is respectively connect with the end of a middle part 3 respectively, the one of separate middle part 3 on flat part 4
End is provided with pneumatic cylinder 14, and the axis of the pneumatic cylinder 14 is parallel to the center line of guide part 2, and cylinder bottom and flat part 4 connect
It connects, piston-rod end is directed away from the direction of flat part 4, is arranged on the inner concave of middle part 3 along the contour of middle part 3
There is guide groove 5, is provided with sequentially connected pressure sensor 13 and transmitting spring 6 at the both ends of guide groove 5, the pressure passes
Sensor 13 is fixed on the end of guide groove 5, and pressure sensor 13 can acquire the pressure information from transmitting spring 6；
The transmitting assembly is located at the inside of guide part 2 comprising elastic telescopicing rod and support ring 20, the telescopic rod
Axis is overlapped with the center line of guide part 2, and telescopic rod includes being sequentially connected the simultaneously moving cylinder 7 of coaxial line, energy-storaging spring 8 and movement
Bar 9, the support ring 20 are set in moving cylinder 7, and support arm 21 is provided on a pair of of opposite outer walls of support ring 20, described
One end on support arm 21 far from support ring 20 is respectively connect with a flat part 4 respectively, and movement is inserted into one end of the mobile bar 9
It in the centre bore of cylinder 7, and is connect with the bottom hole of centre bore by energy-storaging spring 8, there are two the other end of mobile bar 9 is hingedly arranged
Guide rod 10, perpendicular to the U-shaped face of guide part 2, one end on guide rod 10 close to middle part 3 is all provided with the hinged axis
It is equipped with guide pad 11, the guide pad 11 is inserted into guide groove 5, and is respectively passed respectively on a transmitting spring 6 far from pressure
The end thereof contacts of sensor 13；
Magnet 12 is provided on the face relative to each other of guide rod 10, the magnet 12 repels one another so that guide rod 10
Axis with the axis of transmitting assembly formed acute angle, at this time transmit spring 6 be in ortho states；
The controller is connect with the driving motor of pneumatic cylinder 14 and pressure sensor 13, pressure sensor 13 by its
Collected pressure information is sent to controller, and controller receives the information from pressure sensor 13, and controls driving motor
Working condition.
In use, fixing seat 1 is mounted on the face for being also easy to produce collision, far from one end direction of mobile bar 9 in moving cylinder 7
Collision source.When colliding, moving cylinder 7 is first contacted with collision source, and impact force acts directly in moving cylinder 7, then accumulation of energy
Spring 8 is compressed, and as energy-storaging spring 8 is compressed, the part energy of impact force converts another part in energy-storaging spring 8
Energy pushes telescopic rod whole mobile to middle part 3, while guide rod 10 is under the movement of telescopic rod, around hinged axis
Rotation, therewith away from each other far from hinged one end, guide pad 11 is along the cell wall of guide groove 5 to corresponding transmitting for guide rod 10
Spring 6 is mobile, and compresses transmitting spring 6, carries out the conversion of a part of impact force, and as transmitting spring 6 is compressed, stretches
Contracting bar can continue then to continue conversion to the movement of middle part 3 and fall a part of impact force.During transmitting spring 6 is compressed,
Pressure sensor 13 is triggered, and its collected pressure information from transmitting spring 6 is sent controller, and controller receives
After information from pressure sensor, start pneumatic cylinder 14, then makes its piston rod top to collision source, generate one and impact phase
Anti- power then offsets a part of impact force.
Controller, pressure sensor and controller control driving motor, the working method for receiving pressure sensor are
The prior art.
The present invention, can not only by the compression of energy-storaging spring 8 and the movement of telescopic rod come multiple positions by impact force into
Row is longitudinal to be absorbed, and impact force can also be passed through guide pad 11 etc. by the rotation of guide rod 10 and the compression of transmitting spring 6
Component is transferred to other directions, then weakens the whole impact force size born in impact direction of automobile, prevents impact force larger
When, car body generates damage；And a power opposite with impact can also be generated, then offsets one by starting pneumatic cylinder 13
Divide impact force；Simultaneously, moreover it is possible to which, by transmitting spring 6, while increasing the buffer path of impact force, buffer unit is in impact force
Increased length is far smaller than the increased length of buffer path on direction, then controls the volume of buffer unit entirety, then protects
The traffic traveling of card automobile is parked and aesthetics.
Simultaneously magnet setting so that the present invention be in when work state, the axis of guide rod always with transmitting assembly
Axis forms acute angle, is then conducive to the present invention when buffering, and guide pad can be successfully along the cell wall of guide groove to right
The transmitting spring answered is mobile, without generating guide rod close to the axis of transmitting assembly and contacting with each other, and causes in this position
Movement dead is generated, guide pad is not easy to and occurs along the situation that cell wall moves.
Further, stiffening plate 15, the stiffening plate are provided between the arcuate surface and fixing seat 1 of the middle part 3
15 be right angled triangle, and one right-angle side is connect with fixing seat 1, bevel edge indent camber, and is connected with the arcuate surface of middle part 3
It connects, and its radius is consistent with the evagination radius surface of middle part 3, there are two stiffening plates 15, and along the center line center pair of guide part 2
Claim.
The setting of stiffening plate 15 increases the stability that middle part 3 is fixed in fixing seat 1.
Embodiment 2
Controller can use single-chip microcontroller, and concrete model is preferred are as follows: 80C32E；The model of pressure sensor is preferred are as follows:
TJH-10。
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of high efficiency buffer system based on elastic component, it is characterised in that: including controller and sequentially connected fixing seat
(1), U-shaped guide part (2) and transmitting assembly, wherein
The guide part (2) includes arc-shaped middle part (3) and two flat parts (4), the arcuate surface of the middle part (3)
It is connect with fixing seat (1), the flat part (4) respectively connect with the end of a middle part (3) respectively, remote on flat part (4)
One end from middle part (3) is provided with pneumatic cylinder (14), and the axis of the pneumatic cylinder (14) is parallel to the center of guide part (2)
Line, cylinder bottom are connect with flat part (4), and piston-rod end is directed away from the direction of flat part (4), in the interior of middle part (3)
The contour of middle part (3) is provided with guide groove (5) on concave surface, is provided at the both ends of guide groove (5) sequentially connected
Pressure sensor (13) and transmitting spring (6), the pressure sensor (13) is fixed on the end of guide groove (5), and pressure passes
Sensor (13) can acquire the pressure information from transmitting spring (6)；
The transmitting assembly is located at the inside of guide part (2) comprising elastic telescopicing rod and support ring (20), the telescopic rod
Axis is overlapped with the center line of guide part (2), and telescopic rod includes being sequentially connected the simultaneously moving cylinder (7) of coaxial line, energy-storaging spring (8)
With mobile bar (9), the support ring (20) is set on moving cylinder (7), is respectively provided on a pair of of opposite outer walls of support ring (20)
Have support arm (21), one end on the support arm (21) far from support ring (20) is respectively connect with a flat part (4) respectively, institute
It states in the centre bore of one end insertion moving cylinder (7) of mobile bar (9), and is connect by energy-storaging spring (8) with the bottom hole of centre bore,
The other end of mobile bar (9) is hingedly arranged there are two guide rod (10), U-shaped of the hinged axis perpendicular to guide part (2)
Face, one end on guide rod (10) close to middle part (3) are provided with guide pad (11), and the guide pad (11) is inserted into and is led
To in slot (5), and the end thereof contacts on spring (6) far from pressure sensor (13) are respectively transmitted with one respectively；
It is provided on the face relative to each other of guide rod (10) magnet (12), the magnet (12) repels one another so that guide rod
(10) axis forms acute angle with the axis of transmitting assembly, transmits spring (6) at this time and is in ortho states；
The controller is connect with the driving motor of pneumatic cylinder (14) and pressure sensor (13), and pressure sensor (13) will
Its collected pressure information is sent to controller, and controller receives the information for coming from pressure sensor (13), and controls driving
The working condition of motor.
2. a kind of high efficiency buffer system based on elastic component according to claim 1, it is characterised in that: in the middle part
(3) it is provided with stiffening plate (15) between arcuate surface and fixing seat (1), the stiffening plate (15) is right angled triangle, always
The arm of angle is connect with fixing seat (1), bevel edge indent camber, and is connect with the arcuate surface of middle part (3), and its radius and centre
The evagination radius surface in portion (3) is consistent, and there are two stiffening plates (15), and along the center line central symmetry of guide part (2).
3. a kind of high efficiency buffer system based on elastic component according to claim 2, it is characterised in that: the middle part
(3) and fixing seat (1) is welded with stiffening plate (15).
4. a kind of high efficiency buffer system based on elastic component according to claim 1, it is characterised in that: the guide part
(2) integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810843366.3A CN109017645A (en) | 2018-07-27 | 2018-07-27 | A kind of high efficiency buffer system based on elastic component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810843366.3A CN109017645A (en) | 2018-07-27 | 2018-07-27 | A kind of high efficiency buffer system based on elastic component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109017645A true CN109017645A (en) | 2018-12-18 |
Family
ID=64647073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810843366.3A Withdrawn CN109017645A (en) | 2018-07-27 | 2018-07-27 | A kind of high efficiency buffer system based on elastic component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109017645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109866728A (en) * | 2019-03-22 | 2019-06-11 | 安徽彤上智能科技有限公司 | It is a kind of to reduce the automobile buffer beam for hitting kinetic energy |
| CN112003150A (en) * | 2020-08-31 | 2020-11-27 | 河南正宇电气有限公司 | Explosion-proof type switch board |
-
2018
- 2018-07-27 CN CN201810843366.3A patent/CN109017645A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109866728A (en) * | 2019-03-22 | 2019-06-11 | 安徽彤上智能科技有限公司 | It is a kind of to reduce the automobile buffer beam for hitting kinetic energy |
| CN112003150A (en) * | 2020-08-31 | 2020-11-27 | 河南正宇电气有限公司 | Explosion-proof type switch board |
| CN112003150B (en) * | 2020-08-31 | 2022-04-22 | 河南正宇电气有限公司 | Explosion-proof type switch board |
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Application publication date: 20181218 |