CN202148151U - Automobile crane and multi-section telescopic arm device thereof - Google Patents
Automobile crane and multi-section telescopic arm device thereof Download PDFInfo
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- CN202148151U CN202148151U CN201120192554U CN201120192554U CN202148151U CN 202148151 U CN202148151 U CN 202148151U CN 201120192554 U CN201120192554 U CN 201120192554U CN 201120192554 U CN201120192554 U CN 201120192554U CN 202148151 U CN202148151 U CN 202148151U
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Abstract
The utility model relates to an automobile crane and a multi-section telescopic arm device thereof. The multi-section telescopic arm device comprises a telescopic oil cylinder installed between a first section arm and a second section arm, a first extending arm rotating wheel fixed on the second section arm, a first extending arm draw cord bypassing the first extending arm rotating wheel and with two ends fixed on the first section arm and the second section arm respectively, a telescopic arm rotating wheel group arranged between a third section arm and a fourth section arm, a telescopic arm draw cord bypassing the telescopic arm rotating wheel group and with two ends fixed on the first section arm and the third section arm respectively, a withdrawing arm rotating wheel group arranged between the first section arm and the second section arm, and a first withdrawing arm draw cord bypassing the withdrawing arm rotating wheel group and with two ends fixed on the second section arm and the fourth section arm respectively. The automobile crane with the multi-section telescopic arm device is further provided. The multi-section telescopic arm device achieves synchronous telescoping of a multi-section telescopic arm through the single telescopic oil cylinder, reduces weight of more than one ton for a hoisting arm, and namely reduces the weight of the whole crane. In addition, self weight of the hoisting arm is reduced so that stability of the whole crane in operation is improved.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of device with multiple sections of telescopic jibs that is used for car hosit.The utility model also relates to a kind of car hosit that is provided with above-mentioned device with multiple sections of telescopic jibs.
Background technology
The principal arm of car hosit is the core component of complete machine, also is complete machine most important load-bearing structural member in hanging year operation, and therefore, the weight of principal arm, intensity and rigidity will directly influence the in-use performance of car hosit.In addition, the technology content of principal arm structure also is the important symbol of car hosit product level, and design, manufacturing, the assembly quality that improves principal arm mechanism is the target that each hoisting crane producer is constantly pursued.
The principal arm telescoping mechanism mainly contains oil cylinder rope row's formula and two kinds of patterns of single cylinder bolt-type; Consider cost and associated fabrication techniques problem; At present, the car hosit of 100 tons and following tonnage adopts five joints (perhaps below five joints) synchronization telescope mechanism as crane arm, and its arrangement mainly adopts oil cylinder rope row formula; For this kind five joint synchronization telescope mechanisms, mainly be to realize two, three, four, five joint arm synchronization telescopes by two inverted telescopic oil cylinders and two groups of telescopic boom rope mechanisms.
Five above-mentioned joints (perhaps below five joints) synchronization telescope mechanism is widely used in the car hosit of medium and small tonnage.Yet for the product of 50 tons and above tonnage on the market, the quality of every telescopic oil cylinder all surpasses one ton, and this makes that the crane arm weight of car hosit is bigger, and productive costs is higher.
Therefore, how developing the device with multiple sections of telescopic jibs that a kind of deadweight gentlier and not influences functions of use, is the technical barrier that those skilled in the art need to be resolved hurrily.
The utility model content
In order to overcome the above-mentioned defective and the deficiency of prior art, on the one hand, the utility model provides a kind of single oil cylinder retractor device.
This single oil cylinder retractor device is except comprising the first segment arm; Be socketed on the second joint arm, the 3rd joint arm and the 4th joint arm in the said first segment arm successively; And telescopic oil cylinder, the cylinder thick stick of said telescopic oil cylinder and cylinder barrel are individually fixed in said first segment arm and the said second joint arm, also comprise:
The first semi-girder runner and the first semi-girder stay cord, the said first semi-girder runner are fixed in the said second joint arm, and the said first semi-girder runner walked around by the said first semi-girder stay cord and two ends are individually fixed in said first segment arm and the said second joint arm;
Telescopic boom runner group and telescopic boom stay cord, said telescopic boom runner are mounted between said the 3rd joint arm and said the 4th joint arm, and said telescopic boom runner group walked around by said telescopic boom stay cord and two ends are individually fixed in said first segment arm and said the 3rd joint arm;
The arm runner group that contracts and the first arm stay cord that contracts, the said arm runner that contracts are mounted between said first segment arm and the said second joint arm, and the said first arm stay cord that contracts is walked around said arm runner group and the two ends of contracting and is individually fixed in said second joint arm and said the 4th joint arm.
Preferably, said telescopic boom runner group comprises first telescopic boom runner that is fixed in said the 3rd joint arm and the second telescopic boom runner that is fixed in said the 4th joint arm; The said arm runner group that contracts comprises and is fixed in first of said first segment arm contract arm runner and the second arm runner that contracts that is fixed in the said second joint arm.
Preferably, the cylinder thick stick of said telescopic oil cylinder is fixed in the afterbody of said first segment arm, and the cylinder barrel of said telescopic oil cylinder is fixed in the afterbody of the said second joint arm near an end of cylinder thick stick.
Preferably, the said first semi-girder runner is fixed in the other end of said cylinder barrel.
Preferably, the said first telescopic boom runner is fixed in the head of said the 3rd joint arm, and the said second telescopic boom runner is fixed in the afterbody of said the 4th joint arm; The first arm runner that contracts is fixed in the head of said first segment arm, and the second arm runner that contracts is fixed in the afterbody of the said second joint arm.
Preferably, said device with multiple sections of telescopic jibs also comprises:
Basic arm, said first segment arm, the said second joint arm, said the 3rd joint arm and said the 4th joint arm are socketed in the said basic arm successively;
The second semi-girder runner and the second semi-girder stay cord, the said second semi-girder runner is fixed in said first segment arm, and the said second semi-girder runner walked around by the said second semi-girder stay cord and two ends are individually fixed in said basic arm and the said second joint arm;
The 3rd arm runner and the second arm stay cord that contracts that contracts, the said the 3rd arm runner that contracts is fixed in said first segment arm, and the said second arm stay cord that contracts is walked around the said the 3rd contract arm runner and two ends and is individually fixed in the basic arm and the second joint arm;
Preferably, each runner is pulley, and each stay cord is steel rope.
Preferably, each runner is sprocket wheel, and each stay cord is chain.
On the other hand, the utility model also provides a kind of car hosit, and this car hosit is provided with above-mentioned each described device with multiple sections of telescopic jibs.
A kind of device with multiple sections of telescopic jibs that the utility model provides and the car hosit that is provided with this device with multiple sections of telescopic jibs through the synchronization telescope of single telescopic oil cylinder realization multi-stage telescopic arms, have improved the stretching speed of crane arm; In addition; Owing to saved a telescopic oil cylinder,, thereby alleviated the weight of complete machine for crane arm reduces weight more than one ton; And because the reduction of crane arm deadweight, improved complete machine in the stability of hanging when carrying operation.
Description of drawings
The structural representation of a kind of device with multiple sections of telescopic jibs that is provided for the utility model first embodiment shown in Figure 1;
The structural representation of a kind of device with multiple sections of telescopic jibs that Fig. 2 is provided for the utility model second embodiment.
The specific embodiment
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.Should be pointed out that description and description order to concrete structure in this part only are the explanations to specific embodiment, should not be regarded as that the protection domain of the utility model is had any restriction.
Please refer to Fig. 1, the structural representation of a kind of device with multiple sections of telescopic jibs that is provided for the utility model first embodiment shown in Figure 1.
As shown in Figure 1, this device with multiple sections of telescopic jibs comprises that first segment arm 11, the second joint arm the 12, the 3rd save arm 13, the 4th joint arm 14, are arranged on inboard telescopic oil cylinder 16, the first semi-girder runner a of the 4th joint arm
1With the first semi-girder stay cord A
1, telescopic boom runner group b
12With telescopic boom stay cord B
12, the arm runner group that contracts c
12With the first arm stay cord C that contracts
12, its annexation is following:
The second joint arm the 12, the 3rd saves arm 13 and the 4th joint arm 14 is socketed in the said first segment arm 11 successively; The cylinder thick stick 161 of said telescopic oil cylinder 16 is fixedly connected on the afterbody of first segment arm 11, and the lower end of the cylinder barrel 162 of said telescopic oil cylinder 16 (near that end of piston rod 161) is fixedly connected on the afterbody of the second joint arm 12;
The first semi-girder runner a
1Be fixedly connected on the upper end (away from that end of piston rod 161) of cylinder barrel 162, the first semi-girder stay cord A
1Walk around the said first semi-girder runner a
1And its two ends are fixedly connected on the afterbody (perhaps being located at the self-equalizing frame of this afterbody, down together) of first segment arm 11 and the afterbody of the 3rd joint arm 13 respectively;
Telescopic boom runner group b
12Comprise the first telescopic boom runner b that is fixed in said the 3rd joint arm 13 heads
1With the second telescopic boom runner b that is fixed in said the 4th joint arm 14 afterbodys
2, telescopic boom stay cord B
12Walk around the first telescopic boom runner b
1With the second telescopic boom runner b
2And its two ends are individually fixed in the afterbody of said first segment arm 11 and the head of said the 3rd joint arm 13 (perhaps being located at the self-equalizing frame of this head, down together);
The arm runner group that contracts c
12Comprise and be fixed in first of the said first segment arm 11 heads arm runner c that contracts
1With the second arm runner c that contracts that is fixed in said second joint arm 12 afterbodys
2, the said first arm stay cord C that contracts
12Walk around the first arm runner c that contracts
1With the said second arm runner c that contracts
2And its two ends are individually fixed in the afterbody of the said second joint arm 12 and the afterbody of said the 4th joint arm 14.
Please refer to Fig. 2, the structural representation of a kind of device with multiple sections of telescopic jibs that Fig. 2 is provided for the utility model second embodiment.
As shown in Figure 2, the device with multiple sections of telescopic jibs among second embodiment is except comprising that the described first segment arm 11, second of first embodiment saves arm 12, the 3rd joint arm the 13, the 4th saves arm 14, is arranged on inboard telescopic oil cylinder 16, the first semi-girder runner a of the 4th joint arm
1With the first semi-girder stay cord A
1, telescopic boom runner group b
12With telescopic boom stay cord B
12, the arm runner group that contracts c
12With the first arm stay cord C that contracts
12Deng outside, also comprise:
The second semi-girder runner a
2With the second semi-girder stay cord A
2, the said second semi-girder runner a
2Be fixed in the afterbody of said first segment arm 11, the said second semi-girder stay cord A
2Walk around the said second semi-girder runner a
2And its two ends are individually fixed in the head of said basic arm 10 and the afterbody of the said second joint arm 12;
The 3rd arm runner c that contracts
3With the second arm stay cord C that contracts
3, the said the 3rd arm runner c that contracts
3Be fixed in the head of said first segment arm 11, the said second arm stay cord C that contracts
3Walk around the said the 3rd arm runner c that contracts
3And its two ends are individually fixed in the afterbody of basic arm 10 and the afterbody of the second joint arm 12.
In the course of the work, can be telescopic oil cylinder 16 fuel feeding through oil pipe and rotating disk, when the rodless cavity oil-feed of telescopic oil cylinder 16, the cylinder barrel 162 of telescopic oil cylinder 16 protract (speed of stretching out of supposing cylinder barrel 162 relative cylinder bars 161 is V); The cylinder barrel 162 of captiveing joint with the afterbody of the second joint arm 12 drives the second joint arm 12 and stretches out, and realizes that the second joint arm 12 stretches out with telescopic oil cylinder 16 synchronously; When the second joint arm 12 stretches out with telescopic oil cylinder 16 synchronously, at the first semi-girder runner a
1Effect under, with the 3rd the joint arm 13 the afterbody bonded assembly first semi-girder stay cord A
1Drive the 3rd joint arm 13 and stretch out, thereby realize that the second joint arm the 12, the 3rd saves stretching out synchronously of arm 13 with the speed of 2V; When the second joint arm 12, the 3rd joint arm 13 stretch out synchronously, walk around the first telescopic boom runner b
1With the second telescopic boom runner b
2Telescopic boom stay cord B
12Drive the 4th joint arm 14 and stretch out, thereby realize that the second joint arm the 12, the 3rd saves stretching out synchronously of arm 13 and the 4th joint arm 14 with two times (being 4V) that the 3rd joint arm 13 stretches out speed; When telescopic oil cylinder 16, the second joint arm 12 stretch out synchronously, walk around the second semi-girder runner a
2The second semi-girder stay cord A
2Drive first segment arm 11 and stretch out, thereby realize that first segment arm 11, the second joint arm the 12, the 3rd save stretching out synchronously of arm 13, the 4th joint arm 14 with 0.5 times (being 0.5V) that the second joint arm 12 stretches out speed.
In the course of the work, when the rod chamber oil-feed of telescopic oil cylinder 16, cylinder barrel 162 retractions of telescopic oil cylinder 16 (suppose that retraction speed is V
1), the cylinder barrel 162 drives second joint arm 12 of captiveing joint with the afterbody of the second joint arm 12 bounces back synchronously, and (speed is V
1); In second joint arm 12 retraction, walk around the first arm runner c that contracts
1With the second arm runner c that contracts
2The first arm stay cord C that contracts
12Driving the 4th joint arm 14 (is 4V with the retraction speed of second 12 4 times on the arm of joint
1) retraction, walk around the first telescopic boom runner b
1With the second telescopic boom runner b
2Telescopic boom stay cord B
12Driving the 3rd joint arm 13 (is 3V with the speed of second 12 3 times on the arm of joint
1) retraction, thereby realize that the second joint arm the 12, the 3rd saves the synchronous retraction of arm 13 and the 4th joint arm 14; In telescopic oil cylinder 16, the second joint arm, 12 retractions, walk around the 3rd arm runner c that contracts
3The second arm stay cord C that contracts
3Drive first segment arm 11 0.5 times of speed with the second joint arm 12 (are 0.5V
1) retraction, thereby realize that first segment arm 11, the second joint arm the 12, the 3rd save the synchronous retraction of arm 13 and the 4th joint arm 14.
Need to prove that each the semi-girder runner among above-mentioned first embodiment and second embodiment, each telescopic boom runner and the arm runner that respectively contracts are pulley or sprocket wheel, each stay cord is steel rope or chain.
Need to prove; Walk around among above-mentioned first embodiment and second embodiment each runner stay cord an end otherwise with the joint arm head be connected; Be connected with the afterbody of joint arm; In other embodiments of the utility model, under the situation that does not influence result of use, also can be connected with other positions of joint arm.
Need to prove; Above-mentioned first embodiment and second embodiment have introduced the specific embodiment of four joint telescopic boom devices and five joint telescopic boom devices respectively; Other embodiment of the utility model also comprise the above telescopic boom device of five joints; For example; Can add a joint arm (being called for short the 5th joint arm) again at the described five joint telescopic boom devices of second embodiment and form six joint telescopic boom devices, the 5th joint arm can be socketed in the 4th joint arm 14 and (under this kind situation, also need be provided with and b between the head of the afterbody of the 5th joint arm and the 4th joint arm 14
1, b
2And the similar telescoping mechanism of stay cord, also need be provided with and c between the afterbody of the afterbody of the 5th joint arm and the 3rd joint arm 13
1, c
2And the stay cord arm mechanism that similarly contracts), also can (under this kind situation, the afterbody of basic arm 10 also need be provided with and a by basic arm 10, first segment arm 11, the second joint arm 12, the 3rd joint arm 13 and the 4th joint arm 14 socket successively
2And the similar semi-girder of stay cord mechanism, the head of basic arm 10 also need be provided with and c
3And the stay cord arm mechanism that similarly contracts).
A kind of device with multiple sections of telescopic jibs that the utility model embodiment provides through the synchronization telescope of single telescopic oil cylinder realization multi-stage telescopic arms, has improved the stretching speed of crane arm; And assembly difficulty is low, in addition, owing to saved a telescopic oil cylinder; For crane arm reduces weight more than one ton; Thereby alleviated the weight of complete machine, and because the reduction of crane arm deadweight, improved complete machine in the stability of hanging when carrying operation.
The utility model also provides a kind of car hosit; This car hosit is provided with above-mentioned device with multiple sections of telescopic jibs; Because above-mentioned device with multiple sections of telescopic jibs has above-mentioned technique effect, therefore, the car hosit that is provided with this device with multiple sections of telescopic jibs also should possess the corresponding techniques effect; Its practical implementation process is similar to the above embodiments, does not give unnecessary details now.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (9)
1. a device with multiple sections of telescopic jibs comprises first segment arm (11), is socketed on the second joint arm (12), the 3rd joint arm (13) and the 4th joint arm (14) in the said first segment arm successively, and telescopic oil cylinder (16), it is characterized in that:
The cylinder thick stick (161) of said telescopic oil cylinder (16) and cylinder barrel (162) are individually fixed in said first segment arm (11) and the said second joint arm (12);
Said device with multiple sections of telescopic jibs also comprises:
The first semi-girder runner (a
1) and the first semi-girder stay cord (A
1), the said first semi-girder runner (a
1) be fixed in said second the joint arm (12), the said first semi-girder stay cord (A
1) walk around the said first semi-girder runner (a
1) and two ends be individually fixed in said first segment arm (11) and said second the joint arm (13);
Telescopic boom runner group (b
12) and telescopic boom stay cord (B
12), said telescopic boom runner group (b
12) be located between said the 3rd joint arm (13) and said the 4th joint arm (14) said telescopic boom stay cord (B
12) walk around said telescopic boom runner group (b
12) and two ends be individually fixed in said first segment arm (11) and said the 3rd the joint arm (13);
The arm runner group that contracts (c
12) and the first arm stay cord (C that contracts
12), the said arm runner group (c that contracts
12) be located between said first segment arm (11) and said second joint arm (12) the said first arm stay cord (C that contracts
12) walk around said contract arm runner group and two ends and be individually fixed in said second joint arm (12) and said the 4th joint arm (14).
2. device with multiple sections of telescopic jibs as claimed in claim 1 is characterized in that, said telescopic boom runner group (b
12) comprise be fixed in said the 3rd the joint arm (13) the first telescopic boom runner (b
1) and be fixed in said the 4th the joint arm (14) the second telescopic boom runner (b
2); The said arm runner group (c that contracts
12) comprise and be fixed in first of said first segment arm (11) arm runner (c that contracts
1) and be fixed in the second arm runner (c that contracts of the said second joint arm (12)
2).
3. device with multiple sections of telescopic jibs as claimed in claim 2; It is characterized in that; The cylinder thick stick (161) of said telescopic oil cylinder (16) is fixed in the afterbody of said first segment arm (11), and the cylinder barrel (162) of said telescopic oil cylinder (16) is fixed in the afterbody of the said second joint arm (12) near an end of cylinder thick stick (161).
4. multi-joint telescoping device as claimed in claim 3 is characterized in that, the said first semi-girder runner (a
1) be fixed in the other end of said cylinder barrel (162).
5. device with multiple sections of telescopic jibs as claimed in claim 4 is characterized in that, the said first telescopic boom runner (b
1) be fixed in said the 3rd the joint arm (13) head, the said second telescopic boom runner (b
2) be fixed in said the 4th the joint arm (14) afterbody; The first arm runner (c that contracts
1) be fixed in the head of said first segment arm (11), the second arm runner (c that contracts
2) be fixed in said second the joint arm (12) afterbody.
6. like each described device with multiple sections of telescopic jibs of claim 1 to 5, it is characterized in that said device with multiple sections of telescopic jibs also comprises:
Basic arm (10), said first segment arm (11), the said second joint arm (12), said the 3rd joint arm (13) and said the 4th joint arm (14) are socketed in the said basic arm (10) successively;
The second semi-girder runner (a
2) and the second semi-girder stay cord (A
2), the said second semi-girder runner (a
2) be fixed in said first segment arm (11), the said second semi-girder stay cord (A
2) walk around the said second semi-girder runner (a
2) and two ends be individually fixed in said basic arm (10) and said second the joint arm (12);
The 3rd arm runner (c that contracts
3) and the second arm stay cord (C that contracts
3), the said the 3rd arm runner (c that contracts
3) be fixed in said first segment arm (11), the said second arm stay cord (C that contracts
3) walk around the said the 3rd arm runner (c that contracts
3) and two ends be individually fixed in basic arm (10) and second the joint arm (12);
7. device with multiple sections of telescopic jibs as claimed in claim 6 is characterized in that each runner is pulley, and each stay cord is steel rope.
8. device with multiple sections of telescopic jibs as claimed in claim 6 is characterized in that each runner is sprocket wheel, and each stay cord is chain.
9. a car hosit is characterized in that, said car hosit is provided with like each described device with multiple sections of telescopic jibs of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120192554U CN202148151U (en) | 2011-06-09 | 2011-06-09 | Automobile crane and multi-section telescopic arm device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120192554U CN202148151U (en) | 2011-06-09 | 2011-06-09 | Automobile crane and multi-section telescopic arm device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202148151U true CN202148151U (en) | 2012-02-22 |
Family
ID=45589218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120192554U Expired - Fee Related CN202148151U (en) | 2011-06-09 | 2011-06-09 | Automobile crane and multi-section telescopic arm device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202148151U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334767A (en) * | 2013-07-11 | 2013-10-02 | 丁达兴 | Synchronous mechanical telescopic boom |
| CN103466474A (en) * | 2013-08-26 | 2013-12-25 | 三一汽车起重机械有限公司 | Telescopic arm device and automobile crane |
| US9452913B2 (en) | 2012-12-20 | 2016-09-27 | Cnh Industrial America Llc | Telescopic boom |
| CN106185653A (en) * | 2016-09-12 | 2016-12-07 | 周明凯 | The synchronous telescopic boom of built-in hydraulic power |
| CN108439223A (en) * | 2017-09-21 | 2018-08-24 | 漳州龙文区信创友工业设计有限公司 | A kind of method of arm of derrick fracture safe protection |
| CN109659662A (en) * | 2019-01-28 | 2019-04-19 | 中国电子科技集团公司第三十八研究所 | A kind of antenna deployment mechanism of telescopic boom |
| CN110745721A (en) * | 2019-11-30 | 2020-02-04 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
| CN111675119A (en) * | 2020-06-23 | 2020-09-18 | 三一汽车起重机械有限公司 | Telescopic arm of crane and crane |
| CN110745721B (en) * | 2019-11-30 | 2024-04-19 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
-
2011
- 2011-06-09 CN CN201120192554U patent/CN202148151U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9452913B2 (en) | 2012-12-20 | 2016-09-27 | Cnh Industrial America Llc | Telescopic boom |
| CN103334767A (en) * | 2013-07-11 | 2013-10-02 | 丁达兴 | Synchronous mechanical telescopic boom |
| CN103334767B (en) * | 2013-07-11 | 2015-09-30 | 福建正方机械有限公司 | Synchronization mechanism telescopic arm |
| CN103466474A (en) * | 2013-08-26 | 2013-12-25 | 三一汽车起重机械有限公司 | Telescopic arm device and automobile crane |
| CN103466474B (en) * | 2013-08-26 | 2015-10-14 | 三一汽车起重机械有限公司 | Telescopic boom device and car hosit |
| CN106185653B (en) * | 2016-09-12 | 2017-08-29 | 周明凯 | The synchronous telescopic boom of built-in hydraulic power |
| CN106185653A (en) * | 2016-09-12 | 2016-12-07 | 周明凯 | The synchronous telescopic boom of built-in hydraulic power |
| CN108439223A (en) * | 2017-09-21 | 2018-08-24 | 漳州龙文区信创友工业设计有限公司 | A kind of method of arm of derrick fracture safe protection |
| CN108439223B (en) * | 2017-09-21 | 2019-10-01 | 泉州台商投资区国钗商贸有限公司 | A kind of method of arm of derrick fracture safe protection |
| CN109659662A (en) * | 2019-01-28 | 2019-04-19 | 中国电子科技集团公司第三十八研究所 | A kind of antenna deployment mechanism of telescopic boom |
| CN109659662B (en) * | 2019-01-28 | 2020-05-15 | 中国电子科技集团公司第三十八研究所 | Telescopic arm type antenna unfolding mechanism |
| CN110745721A (en) * | 2019-11-30 | 2020-02-04 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
| CN110745721B (en) * | 2019-11-30 | 2024-04-19 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
| CN111675119A (en) * | 2020-06-23 | 2020-09-18 | 三一汽车起重机械有限公司 | Telescopic arm of crane and crane |
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