CN111089786B - Device and method for testing impact damage of steel wire rope - Google Patents
Device and method for testing impact damage of steel wire rope Download PDFInfo
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- CN111089786B CN111089786B CN202010070833.0A CN202010070833A CN111089786B CN 111089786 B CN111089786 B CN 111089786B CN 202010070833 A CN202010070833 A CN 202010070833A CN 111089786 B CN111089786 B CN 111089786B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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Abstract
The invention discloses a test device and a test method for steel wire rope impact damage, which comprises a test bed base, a pre-tightening system, a lifting system, a translation system and an impact system, wherein the pre-tightening system is used for applying tension to a test steel wire rope; the lifting system, the impact system and the translation system are sequentially arranged on the test bed base; the pretensioning system is arranged between the lifting system and the translation system. The impact behavior of the steel wire rope under different angles, different forces and different steel wire rope configuration attribute parameters is realized, the real-time accurate detection and analysis of the tension vibration dynamic response process of the steel wire rope after being ejected by impact are realized, and the system is used for researching the mechanical response and damage mechanism of the steel wire rope guardrail after being impacted.
Description
Technical Field
The invention relates to the field of steel wire rope impact damage tests, in particular to a test device and a test method for steel wire rope impact damage.
Background
The steel cable guardrail is composed of a plurality of steel cable wires, and the steel cable wires are twisted by high-strength flexible steel wires and have excellent tensile bending performance. The steel wire rope can intercept an out-of-control vehicle to decelerate and stop the vehicle, kinetic energy of the vehicle running at a high speed is absorbed into elastic potential energy of the steel wire rope, and the good elasticity of the steel wire rope obviously prolongs collision time, so that the transportation tool and other objects are prevented from being damaged due to instant high-speed impact, and the high loading capacity of the steel wire rope also ensures the interception reliability. With the development of industry and the improvement of social level, the automobile holding amount always shows a sharp trend, and traffic accidents also frequently occur. When a vehicle collides with the guardrail, the impact speed per hour can reach 100-120 km/h or even higher, and once the guardrail is broken, more serious accidents can be caused. In 2018, in 10 months, a bus in Chongqing in China collides with a red car when driving to a Yangtze river second bridge, then rushes into an opposite lane to break a guardrail and falls into the river, and 15 people die.
The interception performance parameters of the steel cable guardrail (namely the steel cable) comprise the damage degree of an intercepted body, deceleration time, parking displacement and the stress and damage state of the steel cable, the parameters are related to the speed, the quality, the shape, the collision position and the like of an impact body, the pre-tightening state, the impact times and the attribute parameters of the steel cable, and the limit of the impact times is directly related to the damage degree of the steel wire in the steel cable. Therefore, the steel wire rope impact failure test method and device for simulating the collision of the steel wire rope guardrail on the road are developed, dynamic mechanical response and failure mechanism experimental study after the steel wire rope is impacted are developed, and the method and device have important significance for searching the action relationship between the configuration parameters (length, quantity, rope diameter, specification, pretightening force and the like) of the steel wire rope, the speed, the quality and the like of an impact body and the interception performance and the damage degree of the guardrail, and further improving the impact tolerance and the interception reliability of the steel wire rope guardrail.
At present, the impact damage of the steel wire rope is rarely researched and is similar, and a patent number CN201410728399.5 discloses an impact friction experiment system for winding and lifting the steel wire rope in a kilometer deep well, the device realizes the contact collision of two rotating wheel ropes and is used for researching a mechanism of impact collision damage between the ropes and the surfaces of the ropes, but the device mainly simulates the friction between the ropes in a rope groove of a friction wheel of a winding type lifter and is obviously different from the harsh severe external impact on a protective steel wire rope; the patent No. CN201820173515.5 discloses a high-efficiency steel wire rope impact cutting device for production engineering, which realizes the rapid impact cutting of a steel wire rope and ensures the smoothness of a tangent plane, but the device adopts the cutting working condition and does not relate to the interception performance of the steel wire rope; the steel cord is likewise not subjected to a transverse violent impact. The existing steel wire rope impact tension vibration device or method mainly has the following problems: the harsh impact application working condition of the steel wire rope for interception is not reflected, the application working condition does not relate to the interception performance detection and impact damage analysis of the steel wire rope, and the existing steel wire rope impact tension vibration device or method cannot meet the test requirement.
Disclosure of Invention
The invention aims to provide a device and a method for testing impact damage of a steel wire rope, which are used for solving the problems in the prior art, realizing the impact working condition of a rope surface impact hammer of the steel wire rope under different pre-tightening forces, and detecting and analyzing dynamic responses such as tension vibration and the like of the steel wire rope and the damage mechanism of the steel wire rope.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a test device for steel wire rope impact damage, which comprises a test bed base, a pre-tightening system, a lifting system, a translation system and an impact system, wherein the pre-tightening system is used for applying a pulling force to a test steel wire rope; the lifting system, the impact system and the translation system are sequentially arranged on the test bed base; the pretensioning system is disposed between the lift system and the translation system.
The lifting system comprises a lifting platform and a lifting assembly for driving the lifting platform to move up and down; the translation system comprises a mobile platform and a translation assembly for driving the mobile platform to move in parallel.
The pretensioning system comprises a first steel wire rope fastener and a second steel wire rope fastener; the first steel wire rope fastener is connected with the lifting platform in a sliding manner; the second steel wire rope fastener is fixedly connected with the mobile platform; the first steel wire rope fastener and the second steel wire rope fastener are fixedly connected with the test steel wire rope; and a tension sensor is arranged on the test steel wire rope.
Preferably, the test bed base is fixedly provided with two groups of steel wire mesh frames, the steel wire mesh frames are provided with protective steel wire meshes, and the test steel wire rope is located between the two protective steel wire meshes.
Preferably, the lifting assembly comprises a threaded lead screw and a lifting support frame, two ends of the threaded lead screw are sleeved in a lead screw fixing sleeve, the lead screw fixing sleeve is fixedly arranged on the test bed base, and a threaded guide sleeve is arranged on the threaded lead screw; the lifting support frame comprises two support rods, and the middle parts of the two support rods are hinged; a chute plate is arranged below the lifting platform; one end of the support rod is hinged with the threaded guide sleeve, and the other end of the support rod is hinged with the sliding groove plate; one end of the other supporting rod is hinged with the test bed base, and the other end of the other supporting rod slides in the sliding groove plate; the lifting assembly is driven by a second motor.
Preferably, the translation assembly comprises a ball screw, two ends of the ball screw are connected in bearing seats, the bearing seats are fixedly arranged on a translation mechanism fixing plate, and the translation mechanism fixing plate is fixedly connected to the test bed base; the ball screw is provided with a screw guide sleeve and a screw nut pair, and the moving platform is fixedly connected to the screw guide sleeve and the screw nut pair; the translation assembly is driven by a first motor.
Preferably, the pre-tightening system further comprises a pre-tightening hydraulic cylinder and a tightening plate; a piston rod of the pre-tightening hydraulic cylinder is fixedly connected with the tensioning plate, and the tensioning plate is fixedly connected with the first steel wire rope fastening piece; the tensioning plate is connected with the lifting platform in a sliding mode.
Preferably, the impact system comprises a fixed support, an impact hydraulic cylinder and an impact hammer, the impact hydraulic cylinder is fixedly arranged on the fixed support, a piston rod of the impact hydraulic cylinder penetrates through the fixed support and is fixedly connected with the impact hammer, and the impact hammer is positioned right above the test steel wire rope; two sides of the impact hammer are provided with impact hammer guide rods for guiding; and a fixed tripod for reinforcing the fixed connection effect is arranged in the fixed support.
A test method for impact damage of a steel wire rope is carried out by using any one of the steel wire rope impact damage devices, and comprises the following steps:
7.1 fixedly mounting the test wire rope between the first wire rope fastener and the second wire rope fastener;
7.2 adjusting a lifting system according to the test requirements to enable the test steel wire rope to reach the required inclination angle;
7.3, adjusting the translation system to enable the test steel wire rope to reach a tight state, and checking the connection firmness among all the parts;
7.4 applying a pretightening force to the test steel wire rope, and stopping applying the pretightening force to the test steel wire rope when a tension sensor on the test steel wire rope reaches a set tension;
7.5 the pre-tightening system, the impact system and the translation system are self-locked to ensure the tension of the test steel wire rope;
7.6 the impact system starts to work, applies impact force to the test steel wire rope, and collects and stores data of the tension sensor;
7.7 repeating the step 7.6 to perform the impact test for the required times, sequentially returning the impact system, the pre-tightening system, the lifting system and the translation system, taking down the test steel wire rope, and performing a tensile breaking test on the test steel wire rope to complete the impact breaking test of the steel wire rope.
The invention discloses the following technical effects: the device achieves the purpose of adjusting the test steel wire rope by driving the moving platform to move through the translation assembly in the translation system, achieves the purpose of adjusting different inclination angles of the test steel wire rope by adjusting the height of the lifting platform through the lifting assembly in the lifting system, adjusts the tension force borne by the test steel wire rope through the pre-tightening hydraulic cylinder in the pre-tightening system and adjusts the specification of a steel wire rope grouting fixing block to adjust the thickness of the steel wire rope, and simulates different impact conditions through adjusting different parameters such as the impact force, the impact speed, the impact time, the impact distance and the like of the impact hydraulic cylinder in the impact system. The impact behavior of the steel wire rope under different angles, different forces and different steel wire rope configuration attribute parameters is realized, the real-time accurate detection and analysis of the tension vibration dynamic response process of the steel wire rope after being ejected by impact are realized, and the system is used for researching the mechanical response and damage mechanism of the steel wire rope guardrail after being impacted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an experimental apparatus according to the present invention;
FIG. 2 is a schematic view of the lift system of the present invention;
FIG. 3 is a schematic view of the translation system of the present invention.
Wherein, 1 is a pre-tightening hydraulic cylinder, 2 is a protective steel wire mesh, 4 is a steel wire mesh frame, 5 is an impact hydraulic cylinder, 6 is an impact hydraulic cylinder piston rod, 7 is a fixed tripod, 8 is an impact hammer mechanism, 9 is an impact hammer guide rod, 10 is a first motor, 11 is a first coupling, 13 is a tension sensor, 14 is a translation mechanism fixed plate, 15 is a fixed bracket, 16 is a test steel wire rope, 17 is a test bed base, 19 is a second coupling, 20 is a second motor, 21 is a lifting platform, 22 is a lead screw fixed sleeve, 23 is a threaded lead screw, 24 is a screw, 25 is a threaded guide sleeve, 26 is a lifting support frame, 27 is a pre-tightening hydraulic cylinder piston rod, 28 is a tensioning plate, 29 is a first steel wire rope fastener, 31 is a baffle plate, 32 is a bearing end cover, 33 is a fixed screw, 34 is a bearing seat, 35 is a gasket, 36 is a deep groove ball bearing, 38 is a ball screw, and 40 is a steel wire rope grouting fixed block, 41 is a second steel wire fastener, 42 is a lead screw guide sleeve, 43 is a movable platform, 44 is a lead screw nut pair, 45 is a key, and 47 is a fixed plate.
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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a test device for steel wire rope impact damage, which comprises a test bed base 17, a pre-tightening system, a lifting system, a translation system and an impact system, wherein the pre-tightening system is used for applying pulling force to a test steel wire rope 16; the lifting system, the impact system and the translation system are sequentially arranged on the test bed base 17; the pretensioning system is disposed between the lift system and the translation system. The test bed base 17 is fixedly provided with two groups of steel wire net frames 4, protective steel wire nets 2 are arranged on the steel wire net frames 4, and the test steel wire rope 16 is located between the two protective steel wire nets 2, so that damage to personnel and equipment after the test steel wire rope is broken in the test process is prevented.
The lifting system comprises a lifting platform 21 and a lifting assembly for driving the lifting platform 21 to move up and down, and the lifting assembly is driven by a second motor 20. The lifting assembly comprises a threaded lead screw 23 and a lifting support frame 26, two ends of the threaded lead screw 23 are sleeved in a lead screw fixing sleeve 22, the lead screw fixing sleeve 22 is fixedly arranged on the test bed base 17, and a threaded guide sleeve 25 is arranged on the threaded lead screw 23; the lifting support frame 26 comprises two support rods, and the middle parts of the two support rods are hinged; a chute plate is arranged below the lifting platform 21 and fixedly connected with the lifting platform 21 through a screw 24; one end of one strut is hinged with the threaded guide sleeve 25, and the other end is hinged with the chute plate; one end of the other strut is hinged with the test bed base 17, and the other end slides in the chute plate. The second motor 20 is connected with one end of a threaded lead screw 23 through a second coupling 19.
The translation system comprises a mobile platform 43, a translation assembly for driving the mobile platform 43 in a parallel motion, the translation assembly being driven by a first motor 10. The translation assembly comprises a ball screw 38, two ends of the ball screw 38 are connected in the bearing seat 34 through a gasket 35 and a deep groove ball bearing 36 and are sealed through a bearing end cover 32 and a fixing screw 33; the bearing seat 34 is fixedly arranged on the translation mechanism fixing plate 14, and the translation mechanism fixing plate 14 is fixedly connected to the test bed base 17; the ball screw 38 is provided with a screw guide 42 and a screw nut pair 44, and the movable platform 43 is fixedly connected to the screw guide 42 and the screw nut pair 44. One end of the ball screw 38 is connected with the first motor 10 through the first coupler 11 and the key 45, and a fixing plate 47 is arranged between the first motor 10 and the first coupler 11.
The pre-tightening system comprises a pre-tightening hydraulic cylinder 1, a tightening plate 28, a first steel wire rope fastener 29 and a second steel wire rope fastener 41 which are correspondingly arranged; a piston rod 27 of the pre-tightening hydraulic cylinder 1 is fixedly connected with a tensioning plate 28, and the tensioning plate 28 is fixedly connected with a first steel wire rope fastening piece 29; the tensioning plate 28 is connected with the lifting platform 21 in a sliding way; the second steel wire rope fastener 41 is fixedly connected with the moving platform 43; a test steel wire rope 16 is fixedly connected between the first steel wire rope fastener 29 and the second steel wire rope fastener 41, and the first steel wire rope fastener 29 and the second steel wire rope fastener 41 are both provided with a steel wire rope grouting fixing block 40; the test steel wire rope 16 is provided with a tension sensor 13. One end of the lifting platform 21, which is far away from the pre-tightening hydraulic cylinder 1, is provided with a baffle 31, and the baffle 31 is positioned between the first steel wire rope fastener 29 and the second steel wire rope fastener 41, so that the pre-tightening hydraulic cylinder is prevented from being damaged due to huge impact force.
The impact system comprises a fixing support 15, an impact hydraulic cylinder 5 and an impact hammer 8, wherein the impact hydraulic cylinder 5 is fixedly arranged on the fixing support 15, an impact hydraulic cylinder piston rod 6 of the impact hydraulic cylinder 5 penetrates through the fixing support 15 and is fixedly connected with the impact hammer 8, and the impact hammer 8 is positioned right above the test steel wire rope 16. Two sides of the impact hammer 8 are provided with impact hammer guide rods 9 for guiding. The fixed support 15 is internally provided with a fixed tripod 7 for reinforcing the fixed connection effect.
A test method for steel wire rope impact damage is carried out by applying the steel wire rope impact damage device, and comprises the following steps:
7.1 fixedly installing the test rope 16 between the first rope fastener 29 and the second rope fastener 41;
7.2 driving a second motor 20 to adjust the lifting system according to the test requirements, so that the test steel wire rope 16 reaches the required inclination angle;
7.3 driving the first motor 10 to adjust the translation system, so that the test steel wire rope 16 reaches a tight state, and the connection firmness of all the parts is checked;
7.4 applying a pretightening force to the test steel wire rope 16 through the pretightening hydraulic cylinder 1, and stopping the operation of the pretightening hydraulic cylinder 1 when the tension sensor 13 on the test steel wire rope 16 reaches a set tension;
7.5 self-locking the pre-tightening system, the impact system and the translation system to ensure that the tension of the steel wire rope 16 is tested;
7.6 the impact hydraulic cylinder 5 starts to work, the piston rod 6 of the impact hydraulic cylinder rapidly pushes the impact hammer 8 to apply impact force to the test steel wire rope 16, and data of the tension sensor 13 is collected and stored;
7.7 repeating the step 7.6 to perform the impact test for the required times, sequentially returning the impact system, the pre-tightening system, the lifting system and the translation system, taking down the test steel wire rope 16, performing the tensile breaking test on the test steel wire rope 16, and completing the impact breaking test of the steel wire rope.
The device achieves the purpose of adjusting the test steel wire rope by driving the moving platform to move through the translation assembly in the translation system, achieves the purpose of adjusting different inclination angles of the test steel wire rope by adjusting the height of the lifting platform through the lifting assembly in the lifting system, adjusts the tension force borne by the test steel wire rope through the pre-tightening hydraulic cylinder in the pre-tightening system and adjusts the specification of a steel wire rope grouting fixing block to adjust the thickness of the steel wire rope, and simulates different impact conditions through adjusting different parameters such as the impact force, the impact speed, the impact time, the impact distance and the like of the impact hydraulic cylinder in the impact system. The impact behavior of the steel wire rope under different angles, different forces and different steel wire rope configuration attribute parameters is realized, the real-time accurate detection and analysis of the tension vibration dynamic response process of the steel wire rope after being ejected by impact are realized, and the system is used for researching the mechanical response and damage mechanism of the steel wire rope guardrail after being impacted.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. The utility model provides a test device of wire rope impact failure which characterized in that: the device comprises a test bed base (17), a pre-tightening system, a lifting system, a translation system and an impact system, wherein the pre-tightening system is used for applying tension to a test steel wire rope (16), and the impact system is used for impacting the test steel wire rope (16); the lifting system, the impact system and the translation system are sequentially arranged on the test bed base (17); the pre-tightening system is arranged between the lifting system and the translation system;
the lifting system comprises a lifting platform (21) and a lifting assembly for driving the lifting platform (21) to move up and down; the lifting assembly comprises a threaded lead screw (23) and a lifting support frame (26), two ends of the threaded lead screw (23) are sleeved in a lead screw fixing sleeve (22), the lead screw fixing sleeve (22) is fixedly arranged on the test bed base (17), and a threaded guide sleeve (25) is arranged on the threaded lead screw (23); the lifting support frame (26) comprises two support rods, and the middle parts of the two support rods are hinged; a chute plate is arranged below the lifting platform (21); one end of the support rod is hinged with the threaded guide sleeve (25), and the other end of the support rod is hinged with the sliding groove plate; one end of the other support rod is hinged with the test bed base (17), and the other end of the other support rod slides in the sliding groove plate; the lifting assembly is driven by a second motor (20);
the translation system comprises a moving platform (43), a translation assembly for driving the moving platform (43) to move in parallel; the translation assembly comprises a ball screw (38), two ends of the ball screw (38) are connected into bearing seats (34), the bearing seats (34) are fixedly arranged on a translation mechanism fixing plate, and the translation mechanism fixing plate is fixedly connected to the test bed base (17); the ball screw (38) is provided with a screw guide sleeve (42) and a screw nut pair (44), and the moving platform (43) is fixedly connected to the screw guide sleeve (42) and the screw nut pair (44); the translation assembly is driven by a first motor (10);
the impact system comprises a fixed support (15), an impact hydraulic cylinder (5) and an impact hammer (8), the impact hydraulic cylinder (5) is fixedly arranged on the fixed support (15), an impact hydraulic cylinder piston rod (6) of the impact hydraulic cylinder (5) penetrates through the fixed support (15) to be fixedly connected with the impact hammer (8), and the impact hammer (8) is positioned right above the test steel wire rope (16); two sides of the impact hammer (8) are provided with impact hammer guide rods (9) for guiding; a fixed tripod (7) for reinforcing the fixed connection function is arranged in the fixed support (15);
the pretensioning system comprises a first wire rope fastener (29) and a second wire rope fastener (41); the first steel wire rope fastener (29) is connected with the lifting platform (21) in a sliding manner; the second steel wire rope fastener (41) is fixedly connected with the movable platform (43); the first steel wire rope fastening piece (29) and the second steel wire rope fastening piece (41) are fixedly connected with the test steel wire rope (16); and a tension sensor (13) is arranged on the test steel wire rope (16).
2. The steel wire rope impact damage test device according to claim 1, characterized in that: the test bed is characterized in that two groups of steel wire mesh frames (4) are fixedly arranged on the test bed base (17), protective steel wire meshes (2) are arranged on the steel wire mesh frames (4), and the test steel wire ropes (16) are located between the two protective steel wire meshes (2).
3. The steel wire rope impact damage test device according to claim 1, characterized in that: the pre-tightening system further comprises a pre-tightening hydraulic cylinder (1) and a tensioning plate (28); a piston rod (27) of the pre-tightening hydraulic cylinder (1) is fixedly connected with the tensioning plate (28), and the tensioning plate (28) is fixedly connected with a first steel wire rope fastener (29); the tensioning plate (28) is connected with the lifting platform (21) in a sliding mode.
4. A test method for impact damage of a steel wire rope is characterized by comprising the following steps: the method is carried out by using the steel wire rope impact damage test device of any one of claims 1 to 3, and comprises the following steps:
4.1 fixedly mounting the test rope (16) between the first (29) and second (41) rope fasteners;
4.2 adjusting a lifting system according to the test requirements to enable the test steel wire rope (16) to reach a required inclination angle;
4.3, adjusting the translation system to enable the test steel wire rope (16) to reach a tight state, and checking the connection firmness among all the parts;
4.4, applying a pretightening force to the test steel wire rope (16), and stopping applying the pretightening force to the test steel wire rope (16) when a tension sensor (13) on the test steel wire rope (16) reaches a set tension;
4.5 the pre-tightening system, the impact system and the translation system are self-locked, so that the tension of the steel wire rope (16) is tested;
4.6, applying impact force to the test steel wire rope (16), and collecting and storing data of the tension sensor (13);
4.7 repeating the step 4.6 to perform the impact test for the required times, sequentially returning the impact system, the pre-tightening system, the lifting system and the translation system, taking down the test steel wire rope (16), and performing a tensile breaking test on the test steel wire rope (16) to complete the impact breaking test of the steel wire rope.
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| CN112730107B (en) * | 2020-11-23 | 2023-06-23 | 中国汽车技术研究中心有限公司 | Impact test system and method for power battery pack |
| CN112763196B (en) * | 2020-12-25 | 2023-01-17 | 江苏师范大学 | Impact slip test device for shipboard aircraft arresting cable |
| CN114034458B (en) * | 2022-01-10 | 2022-03-11 | 南通昌荣机电有限公司 | Impact load detection device of steel wire rope head connecting piece |
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| WO2019049304A1 (en) * | 2017-09-08 | 2019-03-14 | 神栄テストマシナリー株式会社 | Impact test device |
| CN207528543U (en) * | 2017-11-28 | 2018-06-22 | 青岛诚达工程检测有限公司 | A kind of safety net detection device |
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