CN112964559A - Gantry crane steel wire rope stretching degree safety detection equipment and method thereof - Google Patents
Gantry crane steel wire rope stretching degree safety detection equipment and method thereof Download PDFInfo
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- CN112964559A CN112964559A CN202110318113.6A CN202110318113A CN112964559A CN 112964559 A CN112964559 A CN 112964559A CN 202110318113 A CN202110318113 A CN 202110318113A CN 112964559 A CN112964559 A CN 112964559A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
- B66C15/065—Arrangements or use of warning devices electrical
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention relates to a gantry crane steel wire rope stretching degree safety detection device and a method thereof, wherein the gantry crane steel wire rope stretching degree safety detection device comprises magnetic components which are equidistantly arranged on a steel wire rope, a magnetic induction sensor and a steel wire rope speed measurement component for detecting the winding and unwinding speed of the steel wire rope; the magnetic induction sensor and the steel wire rope speed measurement assembly are arranged on a trolley of the portal crane through a sleeve, openings for the clearance-avoiding steel wire ropes are respectively formed in the upper side and the lower side of the sleeve, the magnetic induction sensor is fixed in the middle of an inner cavity of the sleeve, and two pairs of the steel wire rope speed measurement assembly are respectively arranged on the upper side and the lower side of the magnetic induction sensor; the gantry crane steel wire rope stretching degree safety detection equipment provided by the invention can monitor the stretching degree of the steel wire rope, avoids the situation that the steel wire rope is excessively stretched and is broken, guarantees the property and personal safety of personnel, and is suitable for further popularization and application.
Description
Technical Field
The invention relates to the field of cranes, in particular to a gantry crane steel wire rope stretching degree safety detection device and a gantry crane steel wire rope stretching degree safety detection method.
Background
The gantry crane is a variant of a bridge crane and is also called a gantry crane. The device is mainly used for loading and unloading operations of outdoor goods yards, stock yards and bulk goods, and is important mechanical equipment for house building and bridge construction. The portal crane has the characteristics of high site utilization rate, large operation range, wide application range, strong universality and the like, and is widely used in port goods yards. The metal structure of the device is like a door-shaped frame, two support legs are arranged under a bearing main beam and can directly walk on a track on the ground, and overhanging cantilever beams can be arranged at the two ends of the main beam.
The steel wire rope used on the portal crane is formed by winding a plurality of strands of thin steel wires, the steel wire rope is influenced by the stretching of a heavy object in the long-time use process, the relatively weak section of the strength of the steel wire rope can be stretched and thinned, the tensile strength of the steel wire rope can be reduced, if the steel wire rope is not found in time, the steel wire rope is easy to break, and property loss and casualties of people are further caused.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for safely detecting the stretching degree of a steel wire rope of a gantry crane.
The invention is realized by the following technical scheme:
a safety detection device for the stretching degree of a steel wire rope of a gantry crane comprises magnetic assemblies, magnetic induction sensors and a steel wire rope speed measurement assembly, wherein the magnetic assemblies are equidistantly arranged on the steel wire rope; the magnetic induction sensor and the steel wire rope speed measurement assembly are mounted on a trolley of the portal crane through a sleeve, openings for the clearance-avoiding steel wire ropes are respectively formed in the upper side and the lower side of the sleeve, the magnetic induction sensor is fixed in the middle of the inner cavity of the sleeve, and the steel wire rope speed measurement assembly is provided with two pairs of upper sides and lower sides which are respectively arranged on the magnetic induction sensor.
Further, magnetic component includes first semicircle ring, second semicircle ring, stings tooth, magnetism strip and locking bolt, evenly be equipped with on the inner wall of first semicircle ring, second semicircle ring and sting the tooth, the magnetism strip inlays on the outer wall of first semicircle ring and second semicircle ring, first semicircle ring and second semicircle ring are through two sets of locking bolt fixed connection, and two sets of locking bolts all pass wire rope and locate the upper and lower both sides of magnetism strip respectively.
Further, the sleeve is assembled by two sets of arc subassemblies and is formed, magnetic induction sensor is fixed in the inner wall middle part of one of them set of arc subassembly, and the upper and lower both ends of two sets of arc subassembly inner walls all are fixed with wire rope speed measuring component, and two sets of wire rope speed measuring component of same height are pressing from both sides tightly wire rope on being in the straight line, the sleeve passes through the bolt fastening on portal crane's dolly.
Furthermore, the side walls of the two sets of arc-shaped components which are connected in an abutting mode are respectively provided with an alignment column and a matching hole matched with the alignment column.
Further, the openings at the upper end and the lower end of the sleeve are coaxially arranged, the upper end and the lower end of the opening are symmetrically funnel-shaped, and the joint of the middle part is in circular arc transition.
Preferably, the steel wire rope speed measuring assembly comprises a guide wheel fixed in an inner cavity of the sleeve and a tachometer used for detecting the rotating speed of the concave wheel on the guide wheel, a support end of the guide wheel is fixed in the inner cavity of the sleeve, a rubber anti-slip layer is arranged on the inner wall of the concave wheel of the guide wheel, and a detection end of the tachometer is connected with a rotating shaft of the concave wheel and used for detecting the rotating speed of the guide wheel.
The invention further provides a method for safely detecting the stretching degree of the steel wire rope of the gantry crane, which comprises the following steps:
inputting the early warning length value of the steel wire rope between the adjacent magnetic assemblies;
scanning the magnetic assemblies through the magnetic induction sensor, and measuring the time required by the adjacent magnetic assemblies to pass through the magnetic induction sensor according to the time difference of the adjacent magnetic assemblies;
the steel wire rope winding and unwinding speed is measured and calculated through the steel wire rope speed measuring component, and the average value measured and calculated by each group of steel wire rope speed measuring components is used as the winding and unwinding speed of the steel wire rope at the moment;
calculating the length of the steel wire rope between the adjacent magnetic assemblies according to the time required by the adjacent magnetic assemblies to pass through the magnetic induction sensor and the winding and unwinding speed of the steel wire rope in the corresponding time measured by the steel wire rope speed measuring assembly;
and when the calculated length of the steel wire rope is larger than the set early warning length value, early warning prompt is carried out.
Compared with the prior art, the invention has the following beneficial effects:
the gantry crane steel wire rope stretching degree safety detection equipment provided by the invention can monitor the stretching degree of the steel wire rope, avoids the situation that the steel wire rope is excessively stretched and is broken, guarantees the property and personal safety of personnel, and is suitable for further popularization and application.
Drawings
FIG. 1 is a schematic of the present invention;
FIG. 2 is an enlarged fragmentary view of the present invention;
FIG. 3 is a front view of the magnetic assembly;
FIG. 4 is a top view of the magnetic assembly;
FIG. 5 is a schematic view of the assembly of the magnetic assembly and the steel wire rope;
FIG. 6 is a schematic diagram of a steel wire rope speed measuring assembly;
FIG. 7 is a schematic view of a magnetic induction sensor;
FIG. 8 is a schematic view of an arc assembly;
figure 9 is a schematic representation of a wireline passing through an arc assembly.
The reference numbers in the figures represent respectively:
a gantry crane-1; a sleeve-2; a magnetic induction sensor-3; a magnetic component-4; a steel wire rope speed measuring component-5; a trolley-11; a steel wire rope-12; an arc assembly-21; a first semi-circular ring-41; a second semi-circular ring-42; a bite-block-43; a magnetic strip-44; locking bolt-45; a guide wheel-51; tachometer-52.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to the attached drawings 1-9, a gantry crane steel wire rope stretching degree safety detection device comprises a magnetic component 4, a magnetic induction sensor 3 and a steel wire rope speed measurement component 5, wherein the magnetic component 4 is equidistantly arranged on a steel wire rope 12; wherein the distance between the magnetic components 4 is 80-100 cm; the magnetic induction sensor 3 and the steel wire rope speed measurement component 5 are arranged on a trolley 11 of the portal crane 1 through a sleeve 2, openings for the clearance steel wire rope 12 are respectively formed in the upper side and the lower side of the sleeve 2, the magnetic induction sensor 3 is fixed in the middle of an inner cavity of the sleeve 2, and two pairs of the steel wire rope speed measurement component 5 are respectively arranged on the upper side and the lower side of the magnetic induction sensor 3; the magnetic induction sensor 3 and the steel wire rope speed measuring component 5 are electrically connected with an external control system; the control system is also connected with a corresponding early warning module, wherein the early warning module can select a warning buzzer, a flashing light and the like.
Further, the magnetic assembly 4 comprises a first semicircular ring 41, a second semicircular ring 42, a snap tooth 43, a magnetic strip 44 and a locking bolt 45, wherein the thickness of the first semicircular ring 41 and the second semicircular ring 42 is about 2.5 mm; the inner walls of the first semicircular ring 41 and the second semicircular ring 42 are uniformly provided with teeth 43, the magnetic strips 44 are embedded on the outer walls of the first semicircular ring 41 and the second semicircular ring 42, the first semicircular ring 41 and the second semicircular ring 42 are fixedly connected through two groups of locking bolts 45, and the two groups of locking bolts 45 penetrate through the steel wire rope 12 and are respectively arranged on the upper side and the lower side of the magnetic strips 44; the second semicircular ring 42 is provided with an internal threaded hole, and the locking bolt 45 is in threaded connection with the internal threaded hole in the second semicircular ring 42, so that the first semicircular ring 41 and the second semicircular ring 42 are fixed; when the first semicircular ring 41 and the second semicircular ring 42 are locked by the locking bolt 45, the first semicircular ring 41 and the second semicircular ring 42 tightly hold the steel wire rope 12 and the teeth 43 are inserted into the steel wire rope 1 to prevent the magnetic component 4 from moving on the steel wire rope, and the magnetic induction sensor 3 can sense the magnetic strip 44 on the magnetic component 4.
As a further improvement, a protruding strip is arranged on the first semicircular ring 41, and a groove matched with the protruding strip is arranged on the second semicircular ring 42, so that the first semicircular ring 41 and the second semicircular ring 42 can be conveniently installed in an aligned manner.
Further, the sleeve 2 is formed by assembling two groups of arc-shaped assemblies 21, the magnetic induction sensor 3 is fixed in the middle of the inner wall of one group of arc-shaped assemblies 21, the upper end and the lower end of the inner wall of the two groups of arc-shaped assemblies 21 are respectively fixed with a steel wire rope speed measurement assembly 5, the two groups of steel wire rope speed measurement assemblies 5 at the same height clamp the steel wire rope 12 on the same straight line, and the sleeve 2 is fixed on the trolley 11 of the portal crane 1 through bolts; wherein sleeve 2 is assembled through the bolt by two sets of arc subassemblies 21 and forms, and this kind of setting is convenient for during later stage installation with sleeve 2 cover in wire rope's the outside. Wherein, the butted side walls of the two groups of arc-shaped components 21 are respectively provided with a positioning column and a matching hole matched with the positioning column; this arrangement facilitates the alignment installation of the two sets of arc assemblies 21.
Furthermore, openings at the upper end and the lower end of the sleeve 2 are coaxially arranged, the upper end and the lower end of each opening are in a symmetrical funnel shape, and the joint of the middle parts is in arc transition; wherein both ends are the funnel-shaped guide effect that can play at wire rope 12's the in-process of receiving and releasing about the opening symmetrically about the opening, and the junction in opening middle part is the circular arc transition, and the circular arc transition can prevent wire rope 12 and is scraped at the in-process of receiving and releasing.
The steel wire rope speed measuring component 5 comprises a guide wheel 51 fixed in the inner cavity of the sleeve 2 and a tachometer 52 used for detecting the rotating speed of a concave wheel on the guide wheel 51, wherein the guide wheel 51 consists of a bracket and a concave wheel rotationally connected to the bracket; the bracket end of the guide wheel 51 is fixed in the inner cavity of the sleeve 2, and the inner wall of the concave wheel of the guide wheel 51 is provided with a rubber anti-skid layer; the rubber anti-slip layer can improve the friction force between the guide wheel 51 and the steel wire rope 12, so that the steel wire rope 12 can better drive the guide wheel 51 to rotate; in addition, the rubber anti-slip layer has certain elasticity, and when the magnetic component 4 on the steel wire rope 12 passes through, the rubber anti-slip layer can avoid, so that the guide wheel 51 is prevented from being damaged by pressure; the detection end of the tachometer 52 is connected with the rotating shaft of the concave wheel and is used for detecting the rotating speed of the tachometer 52, wherein the rotating speed of the tachometer 52 used for detecting the concave wheel is Wr/min, the equivalent circumference of the concave wheel on the guide wheel 51 matched with the steel wire rope 12 is 2 pi R, wherein R is the equivalent radius, when the steel wire rope 12 is attached to the concave wheel, the minimum distance between the attached steel wire rope 12 and the axis of the concave wheel is the equivalent radius R, and the winding and unwinding speed V of the steel wire rope 12 is W2 pi R.
As a further improvement, an ink jet device is further installed in the sleeve 2, and when the calculated length L of the steel wire rope 12 is greater than the set early warning length value, the ink jet device jets ink so as to find out the stretched over-long section of the steel wire rope 12 in the later maintenance.
The embodiment further provides a gantry crane steel wire rope stretching degree safety detection method, which comprises the following steps:
inputting the early warning length value of the steel wire rope 12 between the adjacent magnetic assemblies 4;
scanning the magnetic assemblies 4 through the magnetic induction sensor 3, and measuring the time required by the adjacent magnetic assemblies 4 to pass through the magnetic induction sensor 3 according to the time difference of the adjacent magnetic assemblies 4;
the winding and unwinding speed of the steel wire rope 12 and the winding and unwinding speed V of the steel wire rope 12 are measured and calculated through the steel wire rope speed measuring component 5t＝W t2 π R, wherein WtThe rotation speed of the concave wheel measured by the tachometer 52 at time t; vtThe winding and unwinding speed of the steel wire rope 12 at the time t; and taking the average value measured and calculated by each group of steel wire rope speed measuring component 5 as the winding and unwinding speed of the steel wire rope 12 at the moment
Calculating the length of the steel wire rope 12 between the adjacent magnetic assemblies 4 in an integral manner according to the time required by the adjacent magnetic assemblies 4 to pass through the magnetic induction sensor 3 and the winding and unwinding speed of the steel wire rope 12 in the corresponding time measured and calculated by the steel wire rope speed measuring assembly 5; the length L of the steel wire rope 12 between the adjacent magnetic assemblies 4 is calculated according to the following formula:
wherein t isn+1-tnI.e. the time required for the adjacent magnetic assembly 4 to pass through the magnetic induction sensor 3; for example, t2-t1 are the time differences between the second magnetic assembly 4 and the first magnetic assembly 4 detected by the magnetic induction sensor 3.
When the calculated length L of the steel wire rope 12 is larger than the set early warning length value, the control system controls the corresponding early warning module to perform early warning prompt, namely, a warning buzzer and a flashing light perform early warning prompt.
As a further improvement, the rotation speed of a motor driving the steel wire rope 12 to be wound and unwound is detected, and when the rotation speed of the motor is zero, the length of the steel wire rope 12 between adjacent magnetic assemblies 4 is measured and calculated by taking the magnetic assembly 4 detected by the magnetic induction sensor 3 after the motor is repeatedly rotated as a first detection point; namely, the length of the steel wire rope 12 between the adjacent magnetic assemblies 4 is measured and calculated only when the motor continuously runs; when the rotating speed of the motor is zero, the points of the magnetic assemblies 4 are collected again and calculated, and the length of the steel wire rope 12 between the adjacent magnetic assemblies 4 is calculated without combining the collecting point before the rotating speed of the motor is zero with the collecting point after the repeated rotation.
Further, the last group of magnetic assemblies 4 detected by the magnetic induction sensor 3 before the motor steering change and the first group of magnetic assemblies 4 detected after the motor steering change are not used as input to calculate the length of the steel wire rope 12 between the adjacent magnetic assemblies 4; when the motor rotates forwards and backwards, the magnetic assemblies 4 read by the magnetic induction sensor 3 can be the same magnetic assembly 4, the length of the steel wire rope 12 between the adjacent magnetic assemblies 4 cannot be accurately calculated, and in order to avoid the situation of false alarm, the last group of magnetic assemblies 4 detected by the magnetic induction sensor 3 before the motor steering change and the first group of magnetic assemblies 4 detected after the motor steering change are not used as input for calculation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The safety detection equipment for the stretching degree of the steel wire rope of the gantry crane is characterized by comprising magnetic components (4) which are equidistantly arranged on the steel wire rope (12), a magnetic induction sensor (3) and a steel wire rope speed measurement component (5) for detecting the winding and unwinding speed of the steel wire rope (12); magnetic induction sensor (3) and wire rope speed measuring component (5) are installed on dolly (11) of gantry crane (1) through sleeve (2), the opening that is used for keeping away empty wire rope (12) is offered respectively to the upper and lower both sides of sleeve (2), magnetic induction sensor (3) are fixed in the inner chamber middle part of sleeve (2), wire rope speed measuring component (5) set up two upper and lower both sides of locating magnetic induction sensor (3) respectively.
2. The gantry crane steel wire rope stretching degree safety detection device according to claim 1, wherein the magnetic component (4) comprises a first semicircular ring (41), a second semicircular ring (42), a tooth (43), a magnetic strip (44) and locking bolts (45), the tooth (43) is uniformly arranged on the inner walls of the first semicircular ring (41) and the second semicircular ring (42), the magnetic strip (44) is embedded on the outer walls of the first semicircular ring (41) and the second semicircular ring (42), the first semicircular ring (41) and the second semicircular ring (42) are fixedly connected through two groups of locking bolts (45), and the two groups of locking bolts (45) penetrate through the steel wire rope (12) and are respectively arranged on the upper side and the lower side of the magnetic strip (44).
3. The tensile degree safety detection equipment of the steel wire rope of the gantry crane according to claim 1, wherein the sleeve (2) is formed by assembling two groups of arc-shaped components (21), the magnetic induction sensor (3) is fixed in the middle of the inner wall of one group of arc-shaped components (21), the steel wire rope speed measurement components (5) are fixed at the upper end and the lower end of the inner wall of the two groups of arc-shaped components (21), the two groups of steel wire rope speed measurement components (5) at the same height clamp the steel wire rope (12) on the same straight line, and the sleeve (2) is fixed on a trolley (11) of the gantry crane (1) through bolts.
4. The tensile strength safety detecting equipment for steel wire rope of gantry crane according to claim 3, wherein the butted side walls of the two sets of arc-shaped components (21) are respectively provided with an alignment column and a matching hole matched with the alignment column.
5. The tensile degree safety detection device for steel wire rope of gantry crane according to claim 3, wherein the openings at the upper and lower ends of the sleeve (2) are coaxially arranged, the upper and lower ends of the opening are symmetrically funnel-shaped, and the joint of the middle part is in arc transition.
6. The tensile strength safety detection device for steel wire rope of gantry crane according to claim 1, wherein the steel wire rope speed measurement component (5) comprises a guide wheel (51) fixed in the inner cavity of the sleeve (2) and a tachometer (52) for detecting the rotating speed of a concave wheel on the guide wheel (51), the bracket end of the guide wheel (51) is fixed in the inner cavity of the sleeve (2), a rubber anti-slip layer is arranged on the inner wall of the concave wheel of the guide wheel (51), and the detection end of the tachometer (52) is connected with the rotating shaft of the concave wheel and is used for detecting the rotating speed of the guide wheel (51).
7. A gantry crane steel wire rope stretching degree safety detection method is characterized by comprising the following steps:
inputting the early warning length value of the steel wire rope (12) between the adjacent magnetic components (4);
scanning the magnetic assemblies (4) through the magnetic induction sensor (3), and calculating the time required by the adjacent magnetic assemblies (4) to pass through the magnetic induction sensor (3) according to the time difference of the adjacent magnetic assemblies (4) to pass through;
the winding and unwinding speed of the steel wire rope (12) is measured and calculated through the steel wire rope speed measuring component (5), and the average value measured and calculated by each group of steel wire rope speed measuring components (5) is used as the winding and unwinding speed of the steel wire rope (12) at the moment;
calculating the length of the steel wire rope (12) between the adjacent magnetic assemblies (4) according to the time required by the adjacent magnetic assemblies (4) to pass through the magnetic induction sensor (3) and the winding and unwinding speed of the steel wire rope (12) in the corresponding time measured and calculated by the steel wire rope speed measuring assembly (5);
and when the calculated length of the steel wire rope (12) is larger than the set early warning length value, early warning prompt is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318113.6A CN112964559A (en) | 2021-03-25 | 2021-03-25 | Gantry crane steel wire rope stretching degree safety detection equipment and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318113.6A CN112964559A (en) | 2021-03-25 | 2021-03-25 | Gantry crane steel wire rope stretching degree safety detection equipment and method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112964559A true CN112964559A (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110318113.6A Pending CN112964559A (en) | 2021-03-25 | 2021-03-25 | Gantry crane steel wire rope stretching degree safety detection equipment and method thereof |
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| Country | Link |
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| CN (1) | CN112964559A (en) |
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2021
- 2021-03-25 CN CN202110318113.6A patent/CN112964559A/en active Pending
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