CN102768030A - Hook height limit detection device and dynamic compactor - Google Patents
Hook height limit detection device and dynamic compactor Download PDFInfo
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- CN102768030A CN102768030A CN2012102801698A CN201210280169A CN102768030A CN 102768030 A CN102768030 A CN 102768030A CN 2012102801698 A CN2012102801698 A CN 2012102801698A CN 201210280169 A CN201210280169 A CN 201210280169A CN 102768030 A CN102768030 A CN 102768030A
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Abstract
The invention relates to a hook height limit detection device and a dynamic compactor. The hook height limit detection device comprises a rope pressing mechanism and a position detection mechanism. The rope pressing mechanism comprises a pressing part and a part to be detected, wherein the pressing part is used for pressing a lifting steel wire rope wound on a lifting winch; and the part to be detected is connected with the pressing part and is changed with the variation of the position of the pressing part in the radial direction of the lifting winch. The position detection mechanism comprises a detection switch for detecting whether the part to be detected approaches or is contacted. According to the invention, the height variation of the lifting steel wire rope is indirectly shown by measuring the thickness variation on the lifting winch, and thus, when engineering equipment operates, the engineering equipment is interfered a little, the sending of an error signal is reduced and eliminated, and the influence of an error command on the operation of the engineering equipment is avoided to the greatest extent; and moreover, the hook height limit detection device can be arranged on a rotary table on which the lifting winch is arranged and is stable when operating and the problem that the steel wire rope of the existing counter weight height limit switch, on which a counter weight is hung, is possibly broken is also avoided.
Description
Technical field
The present invention relates to engineering machinery field, relate in particular to a kind of height under hook limit detection device and dynamic compaction machinery.
Background technology
At present; Domestic mostly with 300 ~ 500 tons of rice crawler type dynamic compaction machineries of 50 ~ 80 tons medium and small tonnage crawler cranes transformations; The dynamic compaction machinery of this transformation does not have special-purpose height limit switch; The general Weight type height limit switch of using always on the crawler crane that adopts, this Weight type height limit switch hangs over the jib head of dynamic compaction machinery usually through double-screw bolt, and the below thin steel rope of switch is hung a weight; One through hole is arranged on the weight, and hoist rope passes from the hole of weight.Under the normal condition, hoist rope can freely move up and down in the hole of weight, can not drive weight; But when jib or hoist rope shake because of dropping hammer, weight is shaken up and down.
Deadweight through weight be connected wire rope; Weight can be in free suspension status below arm head; Making highly, limit switch receives the pulling force of weight and connects; If after suspension hook rising highest point held up weight, the height limit switch did not receive the pulling force of weight and breaks off, control system is controlled the upward movement of suspension hook through the make-and-break signal of height limit switch.
Drop hammer during the dynamic compaction machinery operation and can bring bigger vibrations to jib; Weight type height limit switch also can make the thin steel rope that connects switch and Weight type rupture cisco unity malfunction easily along with jib shakes; Jib vibrations cause also vertical tremor thereupon of weight easily in addition; Make the height limit switch send rub-out signal, cause control system to send false command, thereby can not adapt to strong rammer job requirements.
Summary of the invention
The objective of the invention is to propose a kind of height under hook limit detection device and dynamic compaction machinery, can satisfy under the dynamic compaction machinery job requirements, carry out the spacing detection of height under hook effectively.
For realizing above-mentioned purpose; The invention provides a kind of height under hook limit detection device; Comprise and press rope mechanism and position detecting mechanism; Said pressure rope mechanism comprises and is used to compress the portion to be detected that the compressed part of the hoist rope that twines on the elevator changes with the change in location that is connected with said compressed part and makes progress in the footpath of the said elevator that hoists along with compressed part that hoists, said position detecting mechanism comprise be used to detect said to be detected whether near to or in contact with detector switch.
Further; Said compressed part comprises cylinder, elastomeric element and mounting bracket; Said cylinder is installed in the end of said mounting bracket near the said elevator that hoists; Said mounting bracket is hinged on the said elevator place turntable that hoists away from an end of the said elevator that hoists, and said elastomeric element is installed on the said mounting bracket, and the pretightning force that compresses said hoist rope is provided for said cylinder.
Further, said to be detected detection plane that perhaps is arranged on the sidepiece of said mounting bracket for the sidepiece plane of said mounting bracket.
Further, on said elastomeric element, also be provided with through changing length and regulate the adjuster bar of the pretightning force of said elastomeric element.
Further, also be included on the said elevator place turntable that hoists the pressure rope level(l)ing mechanism of the position adjustment of the axis direction that is provided with, said mounting bracket and elastomeric element are parallel to the said elevator that hoists.
Further, also be included on the said elevator place turntable that hoists the switch level governor motion that is provided with, said detector switch is carried out the position adjustment of horizontal direction according to the position of said pressure rope mechanism.
Further; Said cylinder is the nylon cylinder; And said cylinder is fixed on through rolling bearing and is installed in the rotating shaft near an end of the said elevator that hoists of said mounting bracket, and perhaps said cylinder is installed in the end near the said elevator that hoists of said mounting bracket through rolling bearing.
Further, the one or both ends of said cylinder on axis direction are provided with chamfering or fillet.
For realizing above-mentioned purpose; The invention provides a kind of dynamic compaction machinery; Comprise turntable, jib, elevator and hanger system hoist; The said elevator that hoists is fixed on the said turntable, and the hoist rope that twines on the said elevator that hoists links to each other with said hanger system through the lifting pulley on the said jib, it is characterized in that; Also comprise the aforementioned height under hook limit detection device that is arranged on the said turntable; Compressed part in the pressure of the said height under hook limit detection device rope mechanism compresses the hoist rope that twines on the said elevator that hoists, the detector switch in the said position detecting mechanism to be detected in the said pressure rope mechanism whether near to or in contact with detecting, and output detection signal.
Further, also comprise the hydraulic control that the detection signal that sends according to said detector switch limits the height of said hanger system.
Based on technique scheme; The present invention utilizes and presses rope mechanism to compress the hoist rope that twines on the elevator that hoists; The variation in thickness of on the elevator that hoists, twining along with hoist rope; Press rope mechanism also occurrence positions change, again through detector switch detect to be detected the position of pressing in the rope mechanism confirm hanger system whether reached with the elevator that hoists on the relevant constrain height position of hoist rope thickness of twining.The spacing monitoring device of height under hook of the present invention is through the measurement height change that variation in thickness on the elevator embodies indirectly hoist rope that hoists; Therefore when the engineering equipment operation; It is less to be interfered; Sending of minimizing and elimination rub-out signal avoided the influence of false command to the engineering equipment operation as far as possible; In addition; The spacing monitoring device of height under hook of the present invention can be installed on the elevator place turntable that hoists; More stable when operation; Be not easy bigger vibrations to take place operate as normal that can be continual and steady, the problem of also having avoided existing Weight type height limit switch possibly hang the wire cable rupture of weight along with operation process.The present invention is applicable to the various engineering equipments that need to use hanger systems, especially is fit to be applied to dynamic compaction machinery, can be effectively the height of hanger system is detected and controls.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation under the embodiment installment state of height under hook limit detection device of the present invention.
Fig. 2 is the applied control system structural representation of height under hook limit detection device embodiment of the present invention.
Fig. 3,4,5 is respectively the synoptic diagram in front, depression angle and the AA cross section of pressing rope mechanism among the height under hook limit detection device embodiment of the present invention.
Fig. 6,7,8 is respectively the synoptic diagram of front, depression angle and the LOOK LEFT degree of position detecting mechanism among the height under hook limit detection device embodiment of the present invention.
Fig. 9,10 is respectively positive angle and the synoptic diagram of depression angle of another embodiment of height under hook limit detection device of the present invention.
Embodiment
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
As shown in Figure 1, be the structural representation under the embodiment installment state of height under hook limit detection device of the present invention.In the present embodiment; The height under hook limit detection device comprises presses rope mechanism 4 and position detecting mechanism 5; Wherein press rope mechanism 4 to comprise to be used to compress the compressed part and the portion to be detected of the hoist rope that twines on the elevator 1 of hoisting, wherein to be detected change in location that is connected with compressed part and makes progress in the footpath of the elevator 1 that hoists along with compressed part and changing.Whether approaching position detecting mechanism 5 comprise and be used to detect said to be detected detector switch.
The elevator 1 that hoists among Fig. 1 can be fixed on the plane of turntable 2 of dynamic compaction machinery through support 3; Same; Press rope mechanism 4 to be arranged on too on the plane of this turntable 2, because turntable 2 is because own wt, structure and the center of gravity in-scope that is in whole dynamic compaction machinery are therefore then more stable than the jib of dynamic compaction machinery with position detecting mechanism 5; When dynamic compaction machinery carries out operation; The turntable 2 of dynamic compaction machinery wants much little than vibrations that jib took place, and therefore the influence that therefore is arranged on the suffered vibrations of height under hook limit detection device on the turntable much also little, and this just reduces to a certain extent or shakes sending of the rub-out signal that caused when having been avoided because of operation; And then avoided control system to send wrong steering order as far as possible, keep the continual and steady operation of dynamic compaction machinery.
Fig. 2 has provided the applied control system structure of height under hook limit detection device embodiment of the present invention; From Fig. 2, can see; Press rope mechanism near the elevator that hoists; And change to be detected the position that it connects along with the wire rope thickness that twines on the elevator that hoists; And position detecting mechanism is just to pressing to be detected change in location in the rope mechanism to detect; In case the position that detects to be detected has reached predeterminated position (this process can also can be to be detected qualitative determination mode realization that whether is detected etc. through realizing apart from quantitative measurement) or detector switch contacts portion to be detected, thereby trigger position testing agency sends detection signal.
The equipment or the element that receive this detection signal can be the alarm units of acoustooptic form, are used for the generation that alert reaches the constrain height incident, in time carry out manual intervention to impel operating personnel; The equipment or the element that receive this detection signal also can be automatic control units; The hydraulic control shown in Fig. 2 for example; Program according to preset is directly carried out the transmission of steering order to the hydraulic drive mechanism of the elevator that hoists, with change the hoist running etc. of elevator of rotation direction, velocity of rotation and the termination of elevator that hoists.Certainly also allow the combination of said units or integratedly play a role perhaps selectable playing a role jointly.
Fig. 3-5 has provided the synoptic diagram in front, depression angle and the AA cross section of pressing rope mechanism among the height under hook limit detection device embodiment of the present invention respectively.From Fig. 3-5, can see, press rope mechanism to comprise cylinder 54,55, elastomeric element 53 and mounting bracket 51.With reference to the position relation of pressing rope mechanism among Fig. 9 and Figure 10 with the elevator that hoists; Cylinder 54 is installed in the end of mounting bracket 51 near the elevator 1 that hoists with cylinder 55; Mounting bracket 51 is hinged on the elevator 1 place turntable 2 that hoists away from an end of the elevator 1 that hoists; Elastomeric element 53 is installed on the mounting bracket 51, and the pretightning force that compresses the hoist rope on the elevator 1 that hoists is provided for cylinder 54,55.Why compressed part adopts roll form, then is to consider that the rolling friction mode can reduce the loss that causes owing to friction between cylinder and the wire rope in the sliding friction mode as far as possible.
In another kind of implementation; Rotating shaft 56 can directly be fixed on the end of mounting bracket 51 near the elevator 1 that hoists; Rotating shaft 56 is static with respect to mounting bracket 51, and cylinder 54,55 is installed in the rotating shaft 56 through rolling bearing 57, and wherein the outer ring of rolling bearing 57 and cylinder 54,55 are fixing; And inner ring and rotating shaft 56 are fixing, thereby realization cylinder 54,55 also can be realized the rotation action with respect to mounting bracket 51.Adopt rolling bearing can reduce the friction between cylinder and the axle effectively, make the rolling of cylinder more smooth and easy.In addition; Consider that hoist rope possibly can change the position in the elevator rotation process that hoists; May skid off the cylinder in-scope; Therefore can be provided with chamfering or fillet in the one or both ends on the axis direction of cylinder, guide that hoist rope is easier to be entered in the scope that cylinder compresses.
For cylinder 54,55 pretightning force that compresses the hoist rope on the elevator 1 that hoists is provided in order to adjust elastomeric element 53, can on elastomeric element 53, be provided with through changing length and regulates the adjuster bar 52 of the pretightning force of elastomeric element 53.Can see from Fig. 3,4; Adjuster bar 52 can be arranged between elastomeric element 53 (for example spring, elastic threads etc.) and the mounting bracket 51; Just can adjust the pretightning force (be elastomeric element 53 pretightning force that compress hoist rope hoist elevator 1 on is provided for cylinder 54,55) of elastomeric element 53 through the length that changes adjuster bar 52, the position of changing adjuster bar 52 and elastomeric element 53 certainly is feasible too.Elastomeric element 53 also can adopt the form that is arranged on mounting bracket 51 tops; Utilize downward pressure that pretightning force is provided; Equally, can utilize adjuster bar 52 to adjust the pretightning force of elastomeric element 53 (be elastomeric element 53 pretightning force that compress hoist rope hoist elevator 1 on is provided for cylinder 54,55).
In conjunction with Fig. 5, Fig. 9 and Figure 10; Can find out, press the cylinder of rope mechanism one end pressing the elevator 1 that hoists, and the hinge hole 58 of the other end can be fixed on the bearing of turntable 2 through bearing pin etc.; Press rope mechanism just can change rotational angle around hinge hole 58 pairing axis like this along with the variation in thickness of hoist rope on the elevator 1 that hoists; For example ought hoisting, the thickness of hoist rope becomes big on the elevator 1, and then hoist rope overcomes cylinder to its pretightning force that applies, and cylinder is moved to the direction away from the elevator that hoists; Accordingly, mounting bracket also prolongs the angle between 58 respective axes increases of hinge hole and turntable 2 planes thereupon.
Structure through Fig. 6-8 pair position detecting mechanism describes again below; Wherein position detecting mechanism has the switch mounting bracket 42 of detector switch 41 and fixed test switch 41; Wherein detector switch 41 can adopt near switch or travel switch; The position of its setting can be selected in the side near mounting bracket 51 (referring to Fig. 3); And to be detected detection plane that is set to the sidepiece plane of mounting bracket 51 or is arranged on the sidepiece of mounting bracket will pressing rope mechanism, the relevant detection signal is sent in the detection that utilizes detector switch to treat test section.For instance; Can make detector switch 41 just can detect the portion to be detected on the mounting bracket 51 earlier; Along with the rotation of mounting bracket 51, its to be detected gradually away from detector switch 41, and relevant detection switch 41 measured detection signals also change thereupon; When this detection signal perhaps detects less than to be detected less than certain preset value; Then judge the limitation in height reached hanger system, will send the relevant detection signal this moment, and carry out and warn, control hammer ram and come off, reduce the equiprobable operation of elevator rotating speed.Perhaps adopt another kind of implementation; The position to be detected place during the maximum height promptly confirming earlier to limit, and set the detector switch position with this, when operate as normal; If the signal that detector switch detects is greater than certain preset value or when detecting to be detected; Explain to be detected this moment very near detector switch, promptly, then can judge the limitation in height that has reached hanger system corresponding to the position of the maximum height that limits; To send the relevant detection signal this moment, and carry out and to warn, to control hammer ram and come off, reduce the equiprobable operation of elevator rotating speed.
Consider the position that is arranged on the spacing required hoist rope of height under hook that the position of cylinder setting may not be lucky; And during work; The mode that fixedly installs rope press device with respect to turntable possibly cause hoist rope to be separated from the scope that cylinder compresses; Thereby cause the inaccurate of detection, therefore preferably can be to pressing rope mechanism to adjust, to adapt to the position at hoist rope place.
Can adjust on the axis direction with respect to the elevator that hoists in order to make cylinder; Can on the elevator 1 place turntable 2 that hoists, be provided with and press the rope level(l)ing mechanism, can adjust the position that mounting bracket and elastomeric element are parallel to the axis direction of the said elevator that hoists.Wherein pressure rope horizontal adjustment structure has not only comprised the position adjustment structure of mounting bracket, has also comprised the position adjustment structure of elastomeric element.Wherein the hinge hole 58 of the mounting bracket level of can passing is transferred double-screw bolt 581, and is fixed mounting bracket and adjust the position of mounting bracket at the axis direction that is parallel to the elevator 1 that hoists with right-handed nut 585 (left-hand threaded nut 584 and right-handed nut's 585 installation site can be changed) by left-hand threaded nut 584.Can secures resilient member on the levelling lever 582, and elastomeric element can carry out the adjustment of position at levelling lever 582.
Accordingly, can also on the elevator 1 place turntable 2 that hoists, the switch level governor motion be set, can carry out the position adjustment of horizontal direction to detector switch 41 according to the position of pressing rope mechanism.Put the switch level governor motion and comprise mount pad 44; Mount pad 44 is provided with long and narrow groove; The switch mounting bracket 42 of fixed test switch 41 is through being bolted on the mount pad 44; Bolt can slide in the groove of mount pad 44; Realize the adjustable positions of detector switch on the axis direction that is parallel to the elevator that hoists, can realize being arranged on the adjustable positions of detector switch 41 on the vertical direction of the groove glide direction of mount pad 44 in the position adjustment groove 43 through the position adjustment groove 43 on switch mounting bracket 42 tops again.
These adjusting mechanisms can make detector switch 41 can successfully adjust to suitable position, thereby obtain accurately and effectively detection signal.
The engineering equipment that foregoing various height under hook limit detection device embodiment goes for all kinds of use hanger systems and need limit the height of hanger system; Especially be fit to be applied on the dynamic compaction machinery; In a dynamic compaction machinery embodiment of the present invention; Dynamic compaction machinery comprises turntable, jib, elevator and hanger system hoist; The elevator that hoists is fixed on the said turntable; The hoist rope that twines on the elevator that hoists links to each other with hanger system through the lifting pulley on the jib, and this dynamic compaction machinery also comprises any height under hook limit detection device embodiment that the front that is arranged on the said turntable is introduced, and the compressed part that the pressure of this height under hook limit detection device is restricted in the mechanism compresses the hoist rope that twines on the said elevator that hoists; Detector switch in the said position detecting mechanism to be detected in the said pressure rope mechanism whether near to or in contact with detecting, and output detection signal.
This dynamic compaction machinery of using height under hook limit detection device embodiment can reduce or rocks when avoiding operation greatly the influence of height under hook limit detection device, avoids sending of rub-out signal, guarantees that the stable of operation carries out.
In another dynamic compaction machinery embodiment, also comprise the hydraulic control that the detection signal that sends according to said detector switch limits the height of said hanger system.
Be example below with the dynamic compaction machinery, the spacing testing process of height under hook is described, as follows:
Before the dynamic compaction machinery operation; Can allow the maximum height that rises according to the brachium of the jib of dynamic compaction machinery and suspension hook; Transfer double-screw bolt, right-handed nut and left-hand threaded nut to adjust the installation site of pressing rope mechanism through the adjustment level, the position of hoist rope on the elevator that hoists when making compressed part just in time be pressed in the suspension hook hit the ceiling.After adjusting the installation site of compressed part, adjust the installation site of detector switch again through switch mounting bracket and mount pad, make detector switch just in time can detect to be detected of the mounting bracket side or just in time detect fully less than portion to be detected.When the suspension hook hit the ceiling, hoist rope is wound into the below of compressed part, and the angle of its mounting bracket is changed, and causes the detection signal of detector switch to change thereupon.The signal that transmits through detector switch comes the unloader of controlled hydraulic system, and the restriction suspension hook can not continue to rise, and can only descend.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (10)
1. height under hook limit detection device; It is characterized in that; Comprise and press rope mechanism and position detecting mechanism; Said pressure rope mechanism comprises and is used to compress the portion to be detected that the compressed part of the hoist rope that twines on the elevator changes with the change in location that is connected with said compressed part and makes progress in the footpath of the said elevator that hoists along with compressed part that hoists, said position detecting mechanism comprise be used to detect said to be detected whether near to or in contact with detector switch.
2. height under hook limit detection device according to claim 1; It is characterized in that; Said compressed part comprises cylinder, elastomeric element and mounting bracket, and said cylinder is installed in the end of said mounting bracket near the said elevator that hoists, and said mounting bracket is hinged on the said elevator place turntable that hoists away from an end of the said elevator that hoists; Said elastomeric element is installed on the said mounting bracket, and the pretightning force that compresses said hoist rope is provided for said cylinder.
3. height under hook limit detection device according to claim 2 is characterized in that, said to be detected detection plane that perhaps is arranged on the sidepiece of said mounting bracket for the sidepiece plane of said mounting bracket.
4. height under hook limit detection device according to claim 2 is characterized in that, on said elastomeric element, also is provided with through changing length and regulates the adjuster bar of the pretightning force of said elastomeric element.
5. height under hook limit detection device according to claim 2; It is characterized in that, also be included on the said elevator place turntable that hoists the pressure rope level(l)ing mechanism of the position adjustment of the axis direction that is provided with, said mounting bracket and elastomeric element are parallel to the said elevator that hoists.
6. height under hook limit detection device according to claim 5; It is characterized in that, also be included on the said elevator place turntable that hoists the switch level governor motion that is provided with, said detector switch is carried out the position adjustment of horizontal direction according to the position of said pressure rope mechanism.
7. height under hook limit detection device according to claim 2; It is characterized in that; Said cylinder is the nylon cylinder; And said cylinder is fixed on through rolling bearing and is installed in the rotating shaft near an end of the said elevator that hoists of said mounting bracket, and perhaps said cylinder is installed in the end near the said elevator that hoists of said mounting bracket through rolling bearing.
8. height under hook limit detection device according to claim 7 is characterized in that, the one or both ends of said cylinder on axis direction are provided with chamfering or fillet.
9. dynamic compaction machinery; Comprise turntable, jib, elevator and hanger system hoist; The said elevator that hoists is fixed on the said turntable, and the hoist rope that twines on the said elevator that hoists links to each other with said hanger system through the lifting pulley on the said jib, it is characterized in that; Also comprise the arbitrary described height under hook limit detection device of the claim 1 ~ 8 that is arranged on the said turntable; Compressed part in the pressure of the said height under hook limit detection device rope mechanism compresses the hoist rope that twines on the said elevator that hoists, the detector switch in the said position detecting mechanism to be detected in the said pressure rope mechanism whether near to or in contact with detecting, and output detection signal.
10. dynamic compaction machinery according to claim 9 is characterized in that, also comprises the hydraulic control that the detection signal that sends according to said detector switch limits the height of said hanger system.
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| CN201210280169.8A CN102768030B (en) | 2012-08-09 | 2012-08-09 | Hook height limit detection device and dynamic compactor |
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| CN201210280169.8A CN102768030B (en) | 2012-08-09 | 2012-08-09 | Hook height limit detection device and dynamic compactor |
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| CN102768030B CN102768030B (en) | 2015-04-29 |
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| CN103673956A (en) * | 2013-12-13 | 2014-03-26 | 中联重科股份有限公司 | System, method and device for detecting rope releasing length of winch and crane |
| CN105800013A (en) * | 2016-04-11 | 2016-07-27 | 太仓市鑫鹤印刷包装有限公司 | Material receiving device used for packaging machine |
| CN111422770A (en) * | 2020-04-08 | 2020-07-17 | 浙江三一装备有限公司 | Steel wire rope pre-tightening equipment and engineering machinery |
| CN111689406A (en) * | 2019-03-12 | 2020-09-22 | 包尔机械有限公司 | Work machine and method for operating a work machine |
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| CN103673956B (en) * | 2013-12-13 | 2016-03-30 | 中联重科股份有限公司 | System, method and device for detecting rope releasing length of winch and crane |
| CN105800013A (en) * | 2016-04-11 | 2016-07-27 | 太仓市鑫鹤印刷包装有限公司 | Material receiving device used for packaging machine |
| CN111689406A (en) * | 2019-03-12 | 2020-09-22 | 包尔机械有限公司 | Work machine and method for operating a work machine |
| CN111422770A (en) * | 2020-04-08 | 2020-07-17 | 浙江三一装备有限公司 | Steel wire rope pre-tightening equipment and engineering machinery |
| CN111422770B (en) * | 2020-04-08 | 2023-10-03 | 浙江三一装备有限公司 | Steel wire rope pre-tightening equipment and engineering machinery |
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| CN102768030B (en) | 2015-04-29 |
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