CN113979337A - Crane jib pin mute locking device and jib - Google Patents
Crane jib pin mute locking device and jib Download PDFInfo
- Publication number
- CN113979337A CN113979337A CN202111254699.0A CN202111254699A CN113979337A CN 113979337 A CN113979337 A CN 113979337A CN 202111254699 A CN202111254699 A CN 202111254699A CN 113979337 A CN113979337 A CN 113979337A
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- pin
- arm
- arm pin
- jib
- spring
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 210000004907 gland Anatomy 0.000 claims abstract description 13
- 238000013016 damping Methods 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 description 9
- 230000003139 buffering effect Effects 0.000 description 7
- 230000030279 gene silencing Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a crane arm pin mute locking device which comprises an arm pin locking mechanism and a mute mechanism, wherein the arm pin locking mechanism comprises an arm pin, an arm pin bolt, an arm pin spring, a gland and an arm tail, and the mute mechanism comprises a buffer device and a buffer plate; the buffer device is connected with the arm tail through a first screw, and the buffer plate is used for fixing the side wall of the connecting arm pin bolt through a second screw; the damping device is in contact with the damping plate when the arm pin is in the neutral state and the locked state. The invention solves the problem of excessive loud noise when the arm pin is released in the prior art.
Description
Technical Field
The invention relates to a mute locking device for a crane jib pin and a jib, and belongs to the technical field of cranes.
Background
With the increase of the tonnage of the crane, the requirements of customers on the bearing capacity and the length of the suspension arm of the crane are higher and higher, and the single-cylinder bolt type suspension arm has the typical characteristics of no arm length limitation, smooth section change of the suspension arm, high suspension weight performance and the like. Therefore, in the field of large-tonnage cranes, each host manufacturer adopts a single-cylinder bolt type suspension arm so as to meet the lifting weight performance requirements of the increasing market on the cranes.
The single-cylinder bolt type suspension arm mainly comprises a suspension arm structure and an arm pin locking mechanism, and the telescopic function is realized through the combined action of the arm pin locking mechanism and a telescopic oil cylinder. The basic structure composition of the large-tonnage crane is shown in figure 1, only five-section arms are shown in the figure, and actually, the single-cylinder bolt type crane jib is not limited by the number of sections of the jib, and the number of sections of the jib of the current large-tonnage crane can be eight-section arms or more.
As shown in fig. 1, each arm pin locking mechanism can move up and down in each suspension arm, and in the illustrated state, each arm pin locking mechanism is in a locking state; as shown in fig. 2, when the arm pin locking mechanism moves down to the extreme position, the arm and the outer arm are separated and in the unlocked state; as shown in fig. 3, when the arm pin locking mechanism and the arm pin hole are misaligned and the arm pin locking mechanism is released, it is in an intermediate state.
When the existing arm pin locking mechanism is switched from a middle state to a locking state, the rigidity and the thrust of an arm pin spring are high, and when the arm pin is completely released, the arm pin speed is high due to the action of the arm pin spring and is close to being instantly released in place, so that the arm pin and a gland are violently collided, a large sound is generated, and the sound can reach more than 100 decibels.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a crane jib pin mute locking device and a jib, and solves the problem of excessive loud noise when the jib pin is released in the prior art.
In order to achieve the above object, the present invention adopts the following technical solutions:
a crane arm pin mute locking device comprises an arm pin locking mechanism and a mute mechanism, wherein the arm pin locking mechanism comprises an arm pin, an arm pin bolt, an arm pin spring, a gland and an arm tail, and the mute mechanism comprises a buffer device and a buffer plate;
the arm pin bolt is connected with the lower end of the arm pin through threads, an arm pin spring is coaxially sleeved on the outer side of the arm pin, one side of the arm pin spring is connected with the arm tail, and the other side of the arm pin spring is in contact with the step surface of the arm pin;
the buffer device is connected with the arm tail through a first screw, and the buffer plate is used for fixing the side wall of the connecting arm pin bolt through a second screw;
the damping device is in contact with the damping plate when the arm pin is in the neutral state and the locked state.
Further, the buffer device comprises a cylinder body, a cylinder rod, a spring and a flange cover, wherein the cylinder body is fixedly connected with an arm tail, a piston matched with an inner cavity of the cylinder body is arranged on the cylinder rod, the flange cover is sleeved at the lower end of the cylinder rod, the spring is positioned between the inner cavity of the cylinder body and the cylinder rod, a large exhaust hole is formed in the side wall of the cylinder body, and a small exhaust hole penetrating through the piston is formed in the piston.
Furthermore, at least two silencing mechanisms are uniformly arranged along the center of the arm pin locking mechanism.
Furthermore, a hole matched with the arm pin is formed in the arm tail, the arm pin bolt is in threaded connection with the lower end of the arm pin, the arm pin spring is sleeved on the outer side of the arm pin coaxially, and the pressing cover is fixedly connected with a concave hole in the upper end of the arm tail through the bolt.
Further, the stroke of the arm pin locking mechanism is larger than the stroke of the buffer device.
Further, the buffer device is a spring buffer device.
Further, the damper device is an oil/air damper.
A mute locking suspension arm of a crane jib pin comprises the mute locking device of the crane jib pin.
The invention achieves the following beneficial effects:
1. according to the arm pin mute locking device provided by the invention, when the arm pin is released, the speed is greatly reduced before the arm pin is completely released through the final 5mm speed limit setting of the buffer device, so that the arm pin is slowly contacted with the gland, the problem of excessive sound when the arm pin is released is solved, and the release speed can be ensured to meet the technical requirements of extension and retraction.
2. The diameter of the small vent hole in the piston can be adjusted, the buffering effect is further increased, the speed of the arm pin is reduced, and the aim of no sound when the arm pin is released is finally achieved.
Drawings
FIG. 1 is a schematic view of a prior art single cylinder latch boom;
FIG. 2 is a schematic view of a prior art arm pin unlocked state;
FIG. 3 is a schematic view of a prior art arm pin early released state;
FIG. 4 shows a first silent arm lock of the present invention;
FIG. 5 is a first exploded view of the first arm pin noise dampening latch of the present invention;
FIG. 6 is a second exploded view of the first arm pin noise dampening latch of the present invention;
FIG. 7 is a schematic view of the cushioning apparatus of FIG. 4 in accordance with the present invention;
FIG. 8 is an exploded view of the cushioning device of FIG. 4 in accordance with the present invention;
FIG. 9 is a fully unlocked condition of the arm pin of the present invention;
FIG. 10 is an early arm pin release condition of the present invention;
FIG. 11 is a fully released condition of the arm pin of the present invention;
FIG. 12 is a second arm pin mute lock of the present invention;
fig. 13 shows a third arm pin silent lock apparatus according to the present invention.
The meaning of the reference symbols in the figures: 1-arm pin; 2-arm pin bolt; 3-arm pin spring; 4-pressing the cover; 5-a buffer device; 6-a buffer plate; 7-arm tail; 8-bolt; 9-a first screw; 10-a second screw; 11-the arm cylinder of this section; 12-outer joint arm cylinder; 13-arm pin locking mechanism; 14-spring buffer means; 15-oil/air pressure buffer; 16-arm pin hole; 17-one section of arm; 18-two-section arm; 19-three section arm; 20-four section arm; 21-five arm; 51-a cylinder barrel; 52-cylinder rod; 53-a spring; 54-a flange plate; 55-large vent; 56-Small vent.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example one
The embodiment discloses an arm pin mute locking device, which mainly has the function of buffering the collision between the arm pin 1 and a gland 4 and playing a role in silencing when the arm pin 1 is switched from a middle state to a locking state. As shown in fig. 4, 5, and 6, the device includes an arm pin lock mechanism 13 and a mute mechanism. The arm pin locking mechanism 13 comprises an arm pin 1, an arm pin bolt 2, an arm pin spring 3, a gland 4, an arm tail 7 and a bolt 8; the muting mechanism includes a buffer 5 and a buffer plate 6.
The arm tail 7 is provided with a hole for matching with the arm pin 1 and limiting the arm pin 1 to move up and down only. The arm pin bolt 2 is screwed into the lower end of the arm pin 1 through threads, and can move up and down under the tensile force of the telescopic oil cylinder. The arm pin spring 3 is coaxially sleeved on the outer side of the arm pin 1, one side of the arm pin spring is limited by the arm tail 7, and the other side of the arm pin spring is in surface contact with the step of the arm pin 1 and is used for bouncing and supporting the arm pin 1. The gland 4 is fixed in a concave hole at the upper end of the arm tail 7 through a bolt 8, and the gland 4 is also provided with a hole matched with the arm pin 1 and can be used for pressing the step surface of the arm pin 1, so that a limiting function is provided for the arm pin 1, and the arm pin 1 is prevented from freely popping up. The buffer plate 6 is fixed to the sidewall of the arm pin bolt 2 by the second screw 10 while contacting one end of the buffer 5, and the buffer plate 6 is separated from the buffer 5. The buffer device 5 is fixed on the arm tail 7 through the first screw 9, and has the main function of limiting the speed of the arm pin 1 during release, so that the impact sound of the arm pin 1 and the gland 4 is reduced, and when the force of the buffer device is large enough, the buffer device can also be used as a limiting mechanism of the arm pin 1, so that the impact sound of the arm pin 1 and the gland 4 can be completely eliminated, and the effect of mute release of the arm pin is achieved.
In the embodiment, a silencing mechanism is added on the basis of the original arm pin locking mechanism 13, and the silencing mechanism comprises a buffer device 5 and a buffer plate 6 which are matched with each other to limit the releasing speed of the arm pin. In order to avoid excessive torque when the arm pin is released, at least two damping devices 5 and damping plates 6 are arranged uniformly along the center of the arm pin locking mechanism 13.
The specific structure of the buffer device 5 is shown in fig. 7 and 8, and comprises a cylinder body 51, a cylinder rod 52, a spring 53 and a flange cover 54, wherein the flange cover 54 is sleeved on the lower end position of the cylinder rod 52, and when the spring 53 reaches the limit position, the flange cover 54 is contacted with the lower end of the cylinder body 51. The piston of the cylinder rod 52 is provided with a sealing device, the piston is matched with the inner cavity of the cylinder body 51, and a spring 53 is connected between the cylinder rod 52 and the inner cavity of the cylinder body 51. The buffering stroke A of the buffering device can be designed according to actual needs, and in the embodiment, the buffering device only has a limited buffering effect within the range of the last 5mm, and does not have the buffering effect in other strokes. The realization method comprises the following steps: the side wall of the cylinder barrel 51 is provided with a large exhaust hole 55 to ensure no speed limit in normal stroke, the piston of the cylinder rod 52 is provided with a small exhaust hole 56 which penetrates through the cylinder barrel to ensure speed limit buffer in the last 5mm stroke, and the size of the exhaust hole is determined according to buffer time.
The main working principle of the embodiment is as follows:
arm pin unlocking process: when the arm pin bolt 2 is completely pulled down under the tensile force of the telescopic oil cylinder, the states of all parts of the arm pin mute locking device are as shown in fig. 9, at this time, the buffer plate 6 moves down along with the arm pin bolt 2, the cylinder rod 52 in the buffer device 5 moves down under the thrust of the spring 53, the buffer device 5 and the buffer plate 6 are separated because the stroke of the buffer device 5 is smaller than that of the arm pin locking mechanism 13, and at this time, the arm pin mute locking mechanism is in an unlocking state.
The arm pin early releasing process: when the arm pin is released in advance, the states of the components of the arm pin mute locking device are limited to the outer joint arm cylinder 2 as shown in fig. 10, the arm pin 1 is not released completely, the arm pin 1 contacts the outer joint arm cylinder 12, the buffer device 5 contacts the buffer plate 6, and the arm pin mute locking mechanism is in a middle state.
Arm pin complete release process: when the arm pin 1 reaches the arm pin hole 16 of the outer barrel 12, the states of the components of the arm pin mute locking device are as shown in fig. 11, the arm pin 1 suddenly loses the limitation, and starts to move upwards in an accelerating way under the large thrust of the arm pin spring 3, meanwhile, the buffer device 5 gives downward pressure and speed limitation to the arm pin bolt 2, so that the arm pin is prevented from moving too fast until the arm pin 1 is completely released, namely, the arm pin 1 and the gland 4 are mechanically limited, and at the moment, the arm pin mute locking mechanism is in a locking state.
Example two
As shown in fig. 12, the damper 5 may also be replaced with a spring damper 14.
EXAMPLE III
As shown in fig. 13, the damper device 5 may be replaced with an oil/air pressure damper 15.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, modifications and variations can be made without departing from the technical principle of the present invention, such as a buffer device using rubber elastic pad, air support with buffer function, etc., and these modifications and variations should be considered as the protection scope of the present invention.
Claims (8)
1. The crane arm pin mute locking device is characterized by comprising an arm pin locking mechanism (13) and a mute mechanism, wherein the arm pin locking mechanism (13) comprises an arm pin (1), an arm pin bolt (2), an arm pin spring (3), a gland (4) and an arm tail (7), and the mute mechanism comprises a buffer device (5) and a buffer plate (6);
the arm pin bolt (2) is connected with the lower end of the arm pin (1) through threads, the arm pin spring (3) is coaxially sleeved on the outer side of the arm pin (1), one side of the arm pin spring (3) is connected with an arm tail (7), and the other side of the arm pin spring is in contact with the step surface of the arm pin (1);
the buffer device (5) is connected with the arm tail (7) through a first screw (9), and the buffer plate (6) is fixedly connected with the side wall of the arm pin bolt (2) through a second screw (10);
when the arm pin (1) is in the intermediate state and the locked state, the buffer device (5) is in contact with the buffer plate (6).
2. The damping device according to claim 1, characterized in that the damping device (5) comprises a cylinder body (51), a cylinder rod (52), a spring (53) and a flange cover (54), the cylinder body (51) is fixedly connected with the arm tail (7), the cylinder rod (52) is provided with a piston matched with an inner cavity of the cylinder body (51), the flange cover (54) is sleeved on the lower end of the cylinder rod (52), the spring (53) is positioned between the inner cavity of the cylinder body (51) and the cylinder rod (52), the side wall of the cylinder body (51) is further provided with a large exhaust hole (55), and the piston is provided with a small exhaust hole (56) which penetrates through the large exhaust hole.
3. The crane jib pin silence lock arrangement of claim 1, wherein at least two of the silence mechanisms are arranged uniformly along the center of the jib pin lock mechanism (13).
4. The crane jib pin silence locking device according to claim 1, wherein the jib tail (7) is provided with a hole matched with the jib pin (1), the jib pin bolt (2) is in threaded connection with the lower end of the jib pin (1), the jib pin spring (3) is coaxially sleeved on the outer side of the jib pin (1), and the gland (4) is fixedly connected with a concave hole at the upper end of the jib tail (7) through a bolt (8).
5. A crane jib pin silence lock arrangement as claimed in claim 1 wherein the stroke of the jib pin lock mechanism (13) is greater than the stroke of the damping means (5).
6. A jib pin silent locking mechanism according to claim 1, wherein the damping means (5) is a spring damping means.
7. A jib pin silent locking mechanism according to claim 1, wherein the damping means (5) is an oil/gas pressure damper.
8. A jib pin silent locking jib, comprising a jib pin silent locking device according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111254699.0A CN113979337A (en) | 2021-10-27 | 2021-10-27 | Crane jib pin mute locking device and jib |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111254699.0A CN113979337A (en) | 2021-10-27 | 2021-10-27 | Crane jib pin mute locking device and jib |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113979337A true CN113979337A (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111254699.0A Pending CN113979337A (en) | 2021-10-27 | 2021-10-27 | Crane jib pin mute locking device and jib |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113979337A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10024499A1 (en) * | 2000-05-21 | 2001-11-29 | Forschungsges Umformtechnik | Gas compression cylinder as nitrogen spring has control element in cylinder to control force flow by producing or release connection between upper and lower chambers as cylinder moves from position on lid towards base |
| CZ22828U1 (en) * | 2011-07-08 | 2011-10-24 | Knobloch@Rafael | Gas-filled spring device with damping |
| CN203670576U (en) * | 2014-01-13 | 2014-06-25 | 江苏现代电力科技股份有限公司 | Air-resistance shock absorber |
| CN204281127U (en) * | 2014-11-24 | 2015-04-22 | 徐州重型机械有限公司 | A kind of arm pin system, telescopic boom and hoisting crane |
| CN206889554U (en) * | 2017-07-05 | 2018-01-16 | 无锡比德希减震阻尼技术有限公司 | A kind of Novel single-pore piston-type hydraulic buffer |
| CN206889562U (en) * | 2017-07-05 | 2018-01-16 | 无锡比德希减震阻尼技术有限公司 | A kind of new buffer for being easy to processing |
| CN207005185U (en) * | 2017-05-17 | 2018-02-13 | 湖北省平安鼎安全科技咨询有限公司 | With the buffer unit in driving |
| CN109404477A (en) * | 2018-11-21 | 2019-03-01 | 沈阳建筑大学 | A kind of SMA spring-STF viscous damper |
| CN209839043U (en) * | 2019-04-19 | 2019-12-24 | 苏州市富尔达科技股份有限公司 | Double-speed buffer |
| CN110626681A (en) * | 2019-10-15 | 2019-12-31 | 台州科技职业学院 | Buffer of garbage can and garbage can with buffer |
| CN210889881U (en) * | 2019-09-23 | 2020-06-30 | 宁波市仁龙机械有限公司 | High-performance sectional type damping air spring |
| CN214226829U (en) * | 2020-11-03 | 2021-09-17 | 杭州肯创电气系统工程有限公司 | Mute contactor for elevator |
-
2021
- 2021-10-27 CN CN202111254699.0A patent/CN113979337A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10024499A1 (en) * | 2000-05-21 | 2001-11-29 | Forschungsges Umformtechnik | Gas compression cylinder as nitrogen spring has control element in cylinder to control force flow by producing or release connection between upper and lower chambers as cylinder moves from position on lid towards base |
| CZ22828U1 (en) * | 2011-07-08 | 2011-10-24 | Knobloch@Rafael | Gas-filled spring device with damping |
| CN203670576U (en) * | 2014-01-13 | 2014-06-25 | 江苏现代电力科技股份有限公司 | Air-resistance shock absorber |
| CN204281127U (en) * | 2014-11-24 | 2015-04-22 | 徐州重型机械有限公司 | A kind of arm pin system, telescopic boom and hoisting crane |
| CN207005185U (en) * | 2017-05-17 | 2018-02-13 | 湖北省平安鼎安全科技咨询有限公司 | With the buffer unit in driving |
| CN206889554U (en) * | 2017-07-05 | 2018-01-16 | 无锡比德希减震阻尼技术有限公司 | A kind of Novel single-pore piston-type hydraulic buffer |
| CN206889562U (en) * | 2017-07-05 | 2018-01-16 | 无锡比德希减震阻尼技术有限公司 | A kind of new buffer for being easy to processing |
| CN109404477A (en) * | 2018-11-21 | 2019-03-01 | 沈阳建筑大学 | A kind of SMA spring-STF viscous damper |
| CN209839043U (en) * | 2019-04-19 | 2019-12-24 | 苏州市富尔达科技股份有限公司 | Double-speed buffer |
| CN210889881U (en) * | 2019-09-23 | 2020-06-30 | 宁波市仁龙机械有限公司 | High-performance sectional type damping air spring |
| CN110626681A (en) * | 2019-10-15 | 2019-12-31 | 台州科技职业学院 | Buffer of garbage can and garbage can with buffer |
| CN214226829U (en) * | 2020-11-03 | 2021-09-17 | 杭州肯创电气系统工程有限公司 | Mute contactor for elevator |
Non-Patent Citations (1)
| Title |
|---|
| 北方工业大学流体传动与控制教研室，济南华能气动元器件公司: "气动元件及系统设计", 31 August 1996, 机械工业出版社, pages: 115 - 117 * |
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