CN212254579U - Mechanical property testing machine for protective steel pipe scaffold fastener - Google Patents
Mechanical property testing machine for protective steel pipe scaffold fastener Download PDFInfo
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- CN212254579U CN212254579U CN202021653755.9U CN202021653755U CN212254579U CN 212254579 U CN212254579 U CN 212254579U CN 202021653755 U CN202021653755 U CN 202021653755U CN 212254579 U CN212254579 U CN 212254579U
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Abstract
The utility model discloses a belong to mechanical properties and detect technical field, specifically be a protection type steel pipe scaffold fastener mechanical properties testing machine, it includes: the detection cabinet comprises a fixed cabinet, a detection cabinet and a control cabinet, wherein a first controller and a first communication module are arranged inside the fixed cabinet, the detection cabinet is arranged on the top end of the fixed cabinet, a cabinet door is arranged on the front wall of the detection cabinet, a first linear motor is arranged in the middle of the bottom end inside the detection cabinet, the first linear motor is vertically arranged, a fixed plate is arranged on the top end of the first linear motor, and first electric push rods are arranged on two sides of the top end of the fixed plate. This protection type steel pipe scaffold frame fastener mechanical properties testing machine not only can exert pressure everywhere to the fastener, and the position of exerting pressure is more accurate, and detection effect is better, can detect the roughness on fastener surface before exerting pressure and the roughness after exerting pressure moreover, conveniently observes the slight deformation that the fastener produced.
Description
Technical Field
The utility model relates to a mechanical properties detects technical field, specifically is a protection type steel pipe scaffold fastener mechanical properties testing machine.
Background
A mechanical property testing machine for a steel pipe scaffold fastener is a detection device designed according to the requirements of a mechanical property testing method. The detection equipment can detect the mechanical properties of the right-angle fastener, the rotary fastener, the butt-joint fastener and the base, such as skid resistance, damage resistance, torsional rigidity, tensile strength and compression resistance. The mechanical property testing machine for the steel pipe scaffold fastener is mainly used in constructional engineering and is a device for detecting the mechanical properties of the steel pipe scaffold, such as damage resistance, torsional rigidity, compression resistance and the like. But current device often the position of exerting pressure is not accurate enough, and detection effect is not good, when fastener produced slight deformation moreover, the position and the range of deformation can't be fine detected.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.
The utility model discloses a problem that exists in the view of above-mentioned and/or current mechanical properties testing machine has been proposed.
Therefore, the utility model aims at providing a protection type steel pipe scaffold frame fastener mechanical properties testing machine not only can exert pressure everywhere to the fastener, and the position of exerting pressure is more accurate, and detection effect is better, can detect the roughness on fastener surface before exerting pressure and the roughness after exerting pressure moreover, conveniently observes the slight deformation that the fastener produced.
For solving the technical problem, according to the utility model discloses an aspect, the utility model provides a following technical scheme:
the utility model provides a protection type steel pipe scaffold fastener mechanical properties testing machine, it includes: the detection cabinet comprises a fixed cabinet, a detection cabinet and a control cabinet, wherein a first controller and a first communication module are installed inside the fixed cabinet, the detection cabinet is installed at the top end of the fixed cabinet, a cabinet door is installed on the front wall of the detection cabinet, a first linear motor is installed in the middle of the bottom end inside the detection cabinet, the first linear motor is vertically arranged, a fixed plate is installed at the top end of the first linear motor, first electric push rods are installed on two sides of the top end of the fixed plate, clamping plates are installed at the output ends of the two first electric push rods, the two first electric push rods are oppositely arranged, second linear motors are installed on the lower half portions of two inner sides of the detection cabinet, the two second linear motors are vertically arranged, a third linear motor is installed in the middle of the top end inside the detection cabinet, and the third linear motor is horizontally arranged, the utility model discloses a cabinet, including the cabinet, the spliced pole is installed to third linear electric motor's output, two second electric putter is all installed to the output of second linear electric motor and the bottom of spliced pole, swing joint has the post of exerting pressure on the output of second electric putter, install pressure sensor between second electric putter and the post of exerting pressure, detect the vertical two fourth linear electric motor of installing of inside rear wall both sides lower half of cabinet, the lower half transversely installs fourth linear electric motor, and is three in the middle of the inside rear wall of detecting the cabinet all install infrared distance measuring sensor on the output of fourth linear electric motor, control panel and display screen are installed to first half of the outside front wall of switch board, the internally mounted of switch board has second controller and second communication module, second communication module signal connection has first communication module.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: hydraulic push rods are installed at four corners inside the fixed cabinet, supporting plates are installed at the output ends of the four hydraulic push rods, and first anti-slip pads are installed at the bottom ends of the supporting plates.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: the bottom of the fixed cabinet is movably connected with ten wheels at equal intervals.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: the maintenance board is installed to the preceding wall of stationary cabinet, the sealing washer is installed in the outside of maintenance board, the sealing washer is located between maintenance board and the stationary cabinet.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: install the fingerprint lock on the cabinet door, fingerprint lock electric connection has the controller.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: two the relative lateral wall of splint all installs the cushion, the cushion is made for the cotton material of elasticity.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: the lamp shade is installed in the middle of the inside rear wall of the detection cabinet, and the illuminating lamp is installed inside the lamp shade.
As a protection type steel pipe scaffold fastener mechanical properties testing machine's an optimal selection scheme, wherein: a handle is installed to an outside lateral wall of detecting the cabinet, install the antiskid cover on hand.
Compared with the prior art: by opening the cabinet door, the steel pipe scaffold fastener is placed on the fixed plate, the first electric push rod drives the clamping plate to move to clamp the fastener, the first linear motor drives the fastener to move longitudinally, the longitudinal position of the fastener is adjusted, the second linear motor drives the second electric push rod to move, the second electric push rod pushes the pressure applying column to apply pressure to two sides of the fastener, the third linear motor drives the connecting column, the connecting column drives the second electric push rod to move transversely, the top end of the fastener is applied with pressure, the pressure applied by the pressure sensor sensing device is used for observing the pressure applied during deformation, the fourth linear motor drives the infrared distance measuring sensor to detect the distance of each part on the surface of the fastener, after the fastener is applied with pressure, the infrared distance measuring sensor is used for detecting again, the fine deformation generated by the fastener is observed, information is transmitted to the second communication module through the first communication module, and show through the display screen, conveniently long-range looking over, this protection type steel pipe scaffold frame fastener mechanical properties testing machine not only can exert pressure everywhere to the fastener, and the position of exerting pressure is more accurate, and detection effect is better, can detect the roughness on fastener surface before exerting pressure and the roughness after exerting pressure moreover, conveniently observes the slight deformation that the fastener produced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is a front view of the fixing cabinet and the detecting cabinet of the present invention;
fig. 2 is a front view of the control cabinet of the present invention;
FIG. 3 is a sectional view of the fixing cabinet and the detecting cabinet of the present invention;
FIG. 4 is an internal view of the inspection cabinet of the present invention;
fig. 5 is a sectional view of the control cabinet of the present invention.
In the figure: 100 fixed cabinet, 110 first controller, 120 first communication module, 130 hydraulic push rod, 140 supporting plate, 141 first non-slip mat, 150 wheels, 160 maintenance plate, 161 sealing ring, 200 detection cabinet, 210 cabinet door, 211 fingerprint lock, 220 first linear motor, 230 fixed plate, 231 first electric push rod, 232 clamping plate, 233 elastic mat, 240 second linear motor, 250 third linear motor, 251 connection column, 260 second electric push rod, 261 pressure column, 262 pressure sensor, 270 fourth linear motor, 271 infrared distance measuring sensor, 280 lampshade, 281 lighting lamp, 290 handle, 291 non-slip sleeve, 300 control cabinet, 310 control panel, 320 display screen, 330 second controller, 340 second communication module.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways than those specifically described herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic drawings are only examples, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The utility model provides a protection type steel pipe scaffold frame fastener mechanical properties testing machine not only can exert pressure everywhere to the fastener, and the position of exerting pressure is more accurate, and detection effect is better, can detect the roughness on fastener surface before exerting pressure and the roughness after exerting pressure moreover, conveniently observes the slight deformation that the fastener produced, please refer to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, include: a fixed cabinet 100, a detection cabinet 200 and a control cabinet 300;
referring to fig. 1, 2, 3, 4 and 5 again, a first controller 110 and a first communication module 120 are installed inside the fixed cabinet 100, the top end of the fixed cabinet 100 is installed with the detection cabinet 200, the front wall of the detection cabinet 200 is installed with the cabinet door 210, the middle of the bottom end inside the detection cabinet 200 is installed with a first linear motor 220, the first linear motor 220 is longitudinally arranged, the top end of the first linear motor 220 is installed with a fixed plate 230, both sides of the top end of the fixed plate 230 are installed with first electric push rods 231, the output ends of the two first electric push rods 231 are installed with clamping plates 232, the two first electric push rods 231 are oppositely arranged, the lower halves of both sides inside the detection cabinet 200 are installed with second linear motors 240, the two second linear motors 240 are vertically arranged, the middle of the top end inside the detection cabinet 200 is installed with a third linear motor 250, the third linear motor 250 is transversely arranged, the output end of the third linear motor 250 is provided with a connecting column 251, the output ends of the two second linear motors 240 and the bottom end of the connecting column 251 are respectively provided with a second electric push rod 260, the output end of the second electric push rod 260 is movably connected with a pressure application column 261, a pressure sensor 262 is arranged between the second electric push rod 260 and the pressure application column 261, the lower halves of the two sides of the inner rear wall of the detection cabinet 200 are vertically provided with two fourth linear motors 270, the lower half of the middle of the inner rear wall of the detection cabinet 200 is transversely provided with the fourth linear motors 270, the output ends of the three fourth linear motors 270 are respectively provided with an infrared distance measuring sensor 271, the upper half of the outer front wall of the control cabinet 300 is provided with a control panel 310 and a display screen 320, and the control cabinet 300 is internally provided with a second controller 330 and a second communication module 340, the second communication module 340 is in signal connection with the first communication module 120, specifically, the interior of the fixed cabinet 100 is connected with the first controller 110 and the first communication module 120 through bolt threads, the top end of the fixed cabinet 100 is connected with the detection cabinet 200 through bolt threads, the front wall of the detection cabinet 200 is connected with the cabinet door 210 through a hinge, the middle of the bottom end of the interior of the detection cabinet 200 is connected with the first linear motor 220 through bolt threads, the first linear motor 220 is vertically arranged, the top end of the first linear motor 220 is connected with the fixed plate 230 through bolt threads, both sides of the top end of the fixed plate 230 are connected with the first electric push rods 231 through bolt threads, the output ends of the two first electric push rods 231 are connected with the clamping plates 232 through bolt threads, the two first electric push rods 231 are oppositely arranged, the lower halves of both sides of the interior of the detection cabinet 200 are connected with the second linear motor 240 through bolt threads, the two second linear motors 240 are vertically arranged, the middle of the top end inside the detection cabinet 200 is connected with a third linear motor 250 through a bolt thread, the third linear motor 250 is transversely arranged, the output end of the third linear motor 250 is connected with a connecting column 251 through a bolt thread, the output ends of the two second linear motors 240 and the bottom end of the connecting column 251 are both connected with a second electric push rod 260 through a bolt thread, the output end of the second electric push rod 260 is connected with a pressure applying column 261 in a sliding manner, a pressure sensor 262 is embedded and connected between the second electric push rod 260 and the pressure applying column 261, the lower half parts of the two sides of the rear wall inside the detection cabinet 200 are vertically connected with two fourth linear motors 270 through a bolt thread, the lower half part of the middle of the rear wall inside the detection cabinet 200 is transversely connected with a fourth linear motor 270 through a bolt thread, the output ends of the three fourth linear motors 270 are all connected with infrared distance measuring sensors 271 through bolt threads, the upper half part of the front wall outside the control cabinet 300 is connected with a control panel 310 and a display screen 320 through bolt threads, the inside of the control cabinet 300 is connected with a second controller 330 and a second communication module 340 through bolt threads, the second communication module 340 is connected with a first communication module 120 through signal input, the fixed cabinet 100 and the control cabinet 300 are respectively used for protecting internal devices, the detection cabinet 200 and the cabinet door 210 are used for mutually matching and protecting the internal devices and facilitating fragment splashing generated when the steel structure is broken, the first controller 110 is used for fixing equipment inside the detection cabinet 200, the first communication module 120 and the second communication module 340 are used for mutually transmitting information, the first linear motor 220 is used for driving the fixing plate 230 to longitudinally move, the fixing plate 230 is used for placing steel pipe scaffold fasteners, the first electric push rod 231 is used for driving the clamp plate 232 to move, the clamp plate 232 is used for clamping a steel pipe scaffold fastener, the second linear motor 240 and the third linear motor 250 are respectively used for driving the second electric push rod 260 and the connecting column 251, the connecting column 251 is used for connecting the third linear motor 250 with the second electric push rod 260, the second electric push rod 260 is used for pushing the pressure application column 261 to move, the pressure application column 261 is used for applying pressure to the steel pipe scaffold fastener, the pressure sensor 262 is used for sensing the received pressure, the fourth linear motor 270 is used for driving the infrared distance measurement sensor 271 to move, the infrared distance measurement sensor 271 is used for detecting the flatness of the steel pipe scaffold fastener, the control panel 310 is used for sending a control command to the second controller 330, and the display screen 320 is used for displaying the working condition of;
when the steel pipe scaffold fastener is used specifically, by opening the cabinet door 210, the steel pipe scaffold fastener is placed on the fixing plate 230, the first electric push rod 231 drives the clamping plate 232 to move to clamp the fastener, the first linear motor 220 drives the fastener to move longitudinally, the longitudinal position of the fastener is adjusted, the second linear motor 240 drives the second electric push rod 260 to move, the second electric push rod 260 pushes the pressure applying column 261 to apply pressure to two sides of the fastener, the third linear motor 250 drives the connecting column 251, the connecting column 251 drives the second electric push rod 260 to move transversely, the top end of the fastener is applied with pressure, and the pressure applied by the pressure sensor 262 sensing device is used for observing the pressure applied during deformation, the fourth linear motor 270 drives the infrared distance measuring sensor 271 to detect the distance of each part of the surface of the fastener, after the pressure is applied to the fastener, the infrared distance measuring sensor 271 is used for detection again, thereby observe the slight deformation that the fastener produced, through first communication module 120 with information transfer to second communication module 340 on to show through display screen 320, convenient long-range looking over.
Referring to fig. 1 and 3 again, hydraulic push rods 130 are installed at four corners inside the fixed cabinet 100, support plates 140 are installed at output ends of the four hydraulic push rods 130, first anti-slip mats 141 are installed at bottom ends of the four support plates 140, specifically, the four corners inside the fixed cabinet 100 are connected with the hydraulic push rods 130 through bolt threads, the output ends of the four hydraulic push rods 130 are connected with the support plates 140 through bolt threads, the bottom ends of the four support plates 140 are connected with the first anti-slip mats 141 in an adhering manner, the hydraulic push rods 130 are used for pushing the support plates 140 to move, the support plates 140 are used for supporting the fixed cabinet 100, and the first anti-slip mats 141 are used for preventing the support plates 140 from slipping.
Referring to fig. 1 and 2 again, ten wheels 150 are movably connected to the bottom end of the stationary cabinet 100 at equal intervals, and in particular, ten wheels 150 are rotatably connected to the bottom end of the stationary cabinet 100 at equal intervals through a shaft, and the wheels 150 are used for enabling the device to move.
Referring to fig. 1 again, the front wall of the stationary cabinet 100 is provided with a maintenance plate 160, the outer side of the maintenance plate 160 is provided with a sealing ring 161, the sealing ring 161 is located between the maintenance plate 160 and the stationary cabinet 100, specifically, the front wall of the stationary cabinet 100 is connected with the maintenance plate 160 through a bolt and a thread, the outer side of the maintenance plate 160 is connected with the sealing ring 161 in a sealing manner, the sealing ring 161 is located between the maintenance plate 160 and the stationary cabinet 100, the maintenance plate 160 is used for facilitating the opening and maintenance of the internal structure of the stationary cabinet 100, and the sealing ring 161 is used for sealing the connection between the maintenance plate 160 and the stationary cabinet 100.
Referring to fig. 1 again, the cabinet door 210 is provided with a fingerprint lock 211, the fingerprint lock 211 is electrically connected to a controller, specifically, the cabinet door 210 is connected to the fingerprint lock 211 through a bolt and a thread, the fingerprint lock 211 is electrically connected to the controller through an input, and the fingerprint lock 211 is used for controlling the opening of the cabinet door 210 through a fingerprint 300.
Referring to fig. 3 again, the elastic pads 233 are mounted on the opposite side walls of the two clamping plates 232, the elastic pads 233 are made of elastic cotton material, specifically, the elastic pads 233 are bonded to the opposite side walls of the two clamping plates 232, the elastic pads 233 are made of elastic cotton material, and the elastic pads 233 are used for preventing the clamping plates 232 from damaging the steel pipe scaffold fastener.
Referring to fig. 4 again, a lamp shade 280 is installed in the middle of the rear wall inside the detection cabinet 200, and a lighting lamp 281 is installed in the lamp shade 280, specifically, the lamp shade 280 is connected in the middle of the rear wall inside the detection cabinet 200 through a bolt and a thread, the lighting lamp 281 is connected in the lamp shade 280 through a bolt and a thread, the lamp shade 280 is used for protecting the lighting lamp 281, and the lighting lamp 281 is used for providing a lighting function.
Referring to fig. 1 again, a handle 290 is installed on one side wall of the exterior of the detection cabinet 200, an anti-slip sleeve 291 is installed on the handle 290, specifically, the handle 290 is connected to one side wall of the exterior of the detection cabinet 200 through a bolt and a thread, the anti-slip sleeve 291 is sleeved on the handle 290, the handle 290 is used for conveniently pushing the detection cabinet 200, and the anti-slip sleeve 291 is used for conveniently grasping the handle 290.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the non-exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. The utility model provides a protection type steel pipe scaffold fastener mechanical properties testing machine which characterized in that includes: the detection cabinet comprises a fixed cabinet (100), a detection cabinet (200) and a control cabinet (300), wherein a first controller (110) and a first communication module (120) are installed inside the fixed cabinet (100), the detection cabinet (200) is installed at the top end of the fixed cabinet (100), a cabinet door (210) is installed on the front wall of the detection cabinet (200), a first linear motor (220) is installed in the middle of the inner bottom end of the detection cabinet (200), the first linear motor (220) is vertically arranged, a fixing plate (230) is installed at the top end of the first linear motor (220), first electric push rods (231) are installed on two sides of the top end of the fixing plate (230), clamping plates (232) are installed at the output ends of the two first electric push rods (231), the two first electric push rods (231) are oppositely arranged, second linear motors (240) are installed on the lower half portions of two sides inside the detection cabinet (200), the two second linear motors (240) are vertically arranged, a third linear motor (250) is installed in the middle of the top end inside the detection cabinet (200), the third linear motor (250) is transversely arranged, a connecting column (251) is installed at the output end of the third linear motor (250), second electric push rods (260) are installed at the output ends of the two second linear motors (240) and the bottom end of the connecting column (251), a pressure application column (261) is movably connected to the output end of the second electric push rod (260), a pressure sensor (262) is installed between the second electric push rod (260) and the pressure application column (261), two fourth linear motors (270) are vertically installed on the lower half portions of the two sides of the rear wall inside the detection cabinet (200), and a fourth linear motor (270) is transversely installed on the lower half portion of the middle of the rear wall inside the detection cabinet (200), it is three all install infrared distance measuring sensor (271) on the output of fourth linear electric motor (270), control panel (310) and display screen (320) are installed to the outside front wall first half of switch board (300), the internally mounted of switch board (300) has second controller (330) and second communication module (340), second communication module (340) signal connection has first communication module (120).
2. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein hydraulic push rods (130) are installed at four corners of the inside of the fixing cabinet (100), support plates (140) are installed at output ends of the four hydraulic push rods (130), and first anti-skid pads (141) are installed at bottom ends of the four support plates (140).
3. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein ten wheels (150) are movably connected to the bottom end of the fixed cabinet (100) at equal intervals.
4. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein a maintenance plate (160) is installed on the front wall of the fixing cabinet (100), a sealing ring (161) is installed on the outer side of the maintenance plate (160), and the sealing ring (161) is located between the maintenance plate (160) and the fixing cabinet (100).
5. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein a fingerprint lock (211) is installed on the cabinet door (210), and the fingerprint lock (211) is electrically connected with a controller.
6. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein an elastic pad (233) is mounted on one side wall of each of the two clamping plates (232), and the elastic pad (233) is made of elastic cotton material.
7. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein a lampshade (280) is installed in the middle of the inner rear wall of the detection cabinet (200), and an illuminating lamp (281) is installed inside the lampshade (280).
8. The mechanical property testing machine for the protective steel pipe scaffold fastener according to claim 1, wherein a handle (290) is installed on one side wall of the exterior of the detection cabinet (200), and an anti-skid sleeve (291) is installed on the handle (290).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021653755.9U CN212254579U (en) | 2020-08-11 | 2020-08-11 | Mechanical property testing machine for protective steel pipe scaffold fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021653755.9U CN212254579U (en) | 2020-08-11 | 2020-08-11 | Mechanical property testing machine for protective steel pipe scaffold fastener |
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| Publication Number | Publication Date |
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| CN212254579U true CN212254579U (en) | 2020-12-29 |
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| CN202021653755.9U Active CN212254579U (en) | 2020-08-11 | 2020-08-11 | Mechanical property testing machine for protective steel pipe scaffold fastener |
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| CN (1) | CN212254579U (en) |
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