CN214570313U - Lower chord connecting structure of cargo boom of flat-top tower crane - Google Patents
Lower chord connecting structure of cargo boom of flat-top tower crane Download PDFInfo
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- CN214570313U CN214570313U CN202023337537.7U CN202023337537U CN214570313U CN 214570313 U CN214570313 U CN 214570313U CN 202023337537 U CN202023337537 U CN 202023337537U CN 214570313 U CN214570313 U CN 214570313U
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Abstract
The utility model discloses a lower chord connecting structure of a flat-top tower crane boom, wherein the lower end of a single-section arm is provided with two lower chords which are symmetrical with the longitudinal axis of an arm section, a connecting plate which is vertical to the lower chords is welded between the end parts of the two lower chords on the same single-section arm, the lower chord connecting structure comprises a locking mechanism which is used for locking the two connecting plates between two adjacent single-section arms, the locking mechanism comprises a group of positioning holes which are respectively arranged on the two adjacent connecting plates and have corresponding positions, the locking mechanism further comprises a wedge block matched with the radial through groove, the wedge block is matched with the radial through groove in shape, a baffle is arranged at the tail part of the pin shaft, and the distance between the radial through groove and the baffle is larger than the thickness of the two connecting plates. The lower chord connecting structure is simple, good in stability and high in safety.
Description
Technical Field
The utility model relates to a tower crane jib loading boom technical field, concretely relates to last quarter connection structure of crew cut tower crane jib loading boom.
Background
The tower crane is a common hoisting machine in the construction industry, plays an important role in urban construction, and has high requirements on the fatigue strength of a steel structure of the tower crane and the reliability of a part combination part because the tower crane works at high altitude and heavy load and needs frequent installation and disassembly, so that enough safety protection needs to be provided to avoid safety risks. The tower crane boom is formed by hinging and assembling single-section arms into a whole, the upper chord and the lower chord of two adjacent single-section arms are hinged together through a pin shaft, and a connecting plate between the lower chords is usually locked through the matching of bolts and nuts. After a period of use, the bolt and the nut can loosen, potential safety hazards exist, and the bolt and the nut need to be tightened regularly to avoid safety accidents.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the lower chord connecting structure of the cargo boom of the flat-head tower crane has the advantages of simple structure, good stability and high safety.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
a lower chord connecting structure of a lifting arm of a flat-head tower crane is characterized in that the lower end of a single-section arm is provided with two lower chords which are symmetrical to the longitudinal axis of an arm section, a connecting plate which is vertical to the lower chords is welded between the end parts of the two lower chords on the same single-section arm, the lower chord connecting structure comprises a locking mechanism used for locking two connecting plates between two adjacent single-section arms, the locking mechanism comprises a group of positioning holes which are respectively arranged on two adjacent connecting plates and correspond to each other in position, and a pin shaft which is axially inserted through the two positioning holes on the two connecting plates, the pin shaft is provided with a radial through groove, the locking mechanism also comprises a wedge block matched with the radial through groove, the wedge block is matched with the radial through groove in shape, the tail part of the pin shaft is provided with a baffle plate, the distance between the groove wall of one side of the radial through groove close to the tail part of the pin shaft and the baffle is larger than the thickness of the two connecting plates.
As a specific implementation manner, a groove wall of one side of the radial through groove far away from the tail part of the pin shaft is an arc-shaped surface, and correspondingly, the wedge block is provided with an arc-shaped surface corresponding to the arc-shaped surface.
In a specific embodiment, the angle of the inclined surface of the wedge is set between 80 ° and 85 °.
As a specific implementation mode, a radial through hole is formed on the lower side part of the wedge block, and the locking mechanism further comprises a split pin which is matched with the radial through hole for locking.
As a specific implementation mode, the distance between the groove wall of one side of the radial through groove close to the tail part of the pin shaft and the baffle is D1, the thickness of each connecting plate is D2, and D1-2D2 are more than 0 and less than or equal to 3 mm.
As a specific implementation mode, two groups of positioning holes are formed in the connecting plate, and the two groups of positioning holes are respectively arranged at the end parts close to the two lower chords on the same single-section arm.
In a specific embodiment, at least one side wall in the notch of the radial through groove is a rough surface.
Compared with the prior art, the utility model discloses an useful part is: the utility model discloses a last quarter connection structure of crew cut tower crane jib loading boom, its through set up take radial logical groove the round pin axle, with radial logical groove matched with voussoir, can ensure that the tower machine is in the use, connecting plate department is difficult for taking place not hard up, sets up radial through-hole simultaneously on the voussoir, through the split pin with its locking, can effectively ensure this locking mechanism's security, the reliability is high, simple to operate.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts;
fig. 1 is a schematic structural view of a lower chord connecting structure of a jib of a flat-top tower crane according to the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
fig. 3 is a schematic structural view of a pin shaft in the lower chord connecting structure of the jib of the flat-top tower crane of the present invention;
fig. 4 is a schematic structural diagram of a wedge block in a lower chord connecting structure of a jib of a flat-top tower crane according to the present invention;
wherein: 1. a lower chord; 2. a connecting plate; 3. a locking mechanism; 31. a pin shaft; 311. a baffle plate; 312. a radial through groove; 32. a wedge block; 321. a radial through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention:
the lower chord connecting structure of a lifting arm of a flat-head tower crane is characterized in that two lower chords 1 symmetrical to the longitudinal axis of an arm section are arranged at the lower end of a single-section arm, connecting plates 2 perpendicular to the lower chords 1 are welded between the end parts of the two lower chords 1 on the same single-section arm, and the lower chord connecting structure comprises a locking mechanism 3 used for locking the two connecting plates 2 between two adjacent single-section arms, and is shown in figure 1.
This locking mechanical system 3 includes and sets up respectively on two adjacent connecting plates 2 and the position is corresponding a set of locating hole (not marking in the figure), wear to establish the round pin 31 through two locating holes on two connecting plates 2 along self axial, seted up radial logical groove 312 on the round pin 31, see that fig. 3 shows, locking mechanical system 3 still includes the voussoir 32 with radial logical groove 312 matched with, voussoir 32 matches in shape with radial logical groove 312, see that fig. 1, 2 shows, the afterbody of round pin 31 is provided with baffle 311, radial logical groove 312 is close to one side cell wall at the afterbody of round pin 31 and is greater than the thickness of two connecting plates 2 apart from the interval of baffle 311. Through setting up round pin axle 31 and voussoir 32, can be effectual with two connecting plates 2 locking together, and difficult emergence is not hard up in the use, has ensured the security of using, and this radial groove 312 is close to one side cell wall of round pin axle 31 afterbody and sets the thickness that is greater than two connecting plates 2 apart from the interval of baffle 311 to, its purpose: on one hand, the radial through groove 312 cannot be affected to cause looseness; on the other hand, in the hoisting process, the knuckle arm slightly tilts, and a certain gap is formed between the two connecting plates 2 through the arrangement mode so as to relieve the hard contact between the two connecting plates 2. Specifically, in this example, the distance between the groove wall of the radial through groove 312 close to the tail of the pin 31 and the baffle 311 is D1, the thickness of each connecting plate 2 is D2, and the requirement that D1-2D2 is greater than 0 and less than or equal to 3mm is met.
In this embodiment, a groove wall of the radial through groove 312, which is away from the tail of the pin 31, is an arc-shaped surface, and correspondingly, the wedge 32 is provided with an arc-shaped surface corresponding to the arc-shaped surface. Through setting up the arcwall face, reduce the rigid contact of voussoir 32 and round pin axle 31, prolong its life.
In this example, the angle of the slope of the wedge 32 is set at 80-85 °. By setting the angle within the above range, the installation is facilitated.
In this example, in order to increase the safety of the locking mechanism 3, a radial through hole 321 is opened on the lower side of the wedge 32, and as shown in fig. 4, the locking mechanism 3 further includes a cotter pin which is matched and locked with the radial through hole 321. By providing the cotter pin and the radial through hole 321, the mounting reliability can be further secured.
In this example, there are two sets of positioning holes on the connecting plate 2, and the two sets of positioning holes are respectively arranged at the end parts of two lower chords 1 close to the same single-section arm. In this embodiment, at least one sidewall of the slot of the radial slot 312 is rough. By providing a roughened surface, the coefficient of friction between wedge 32 and radial channel 312 is increased, increasing the security of locking mechanism 3.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (7)
1. A lower chord connecting structure of a lifting arm of a flat-head tower crane is characterized in that the lower end of a single-section arm is provided with two lower chords which are symmetrical to the longitudinal axis of an arm section, a connecting plate which is vertical to the lower chords is welded between the end parts of the two lower chords on the same single-section arm, it is characterized in that the lower chord connecting structure comprises a locking mechanism used for locking two connecting plates between two adjacent single-section arms, the locking mechanism comprises a group of positioning holes which are respectively arranged on two adjacent connecting plates and correspond to each other in position, and a pin shaft which is axially inserted through the two positioning holes on the two connecting plates, the pin shaft is provided with a radial through groove, the locking mechanism also comprises a wedge block matched with the radial through groove, the wedge block is matched with the radial through groove in shape, the tail part of the pin shaft is provided with a baffle plate, the distance between the groove wall of one side of the radial through groove close to the tail part of the pin shaft and the baffle is larger than the thickness of the two connecting plates.
2. The lower chord connecting structure of a jib of a flat-head tower crane according to claim 1, wherein a wall of one side of the radial through groove far away from the tail of the pin shaft is an arc-shaped surface, and correspondingly, the wedge block is provided with an arc-shaped surface corresponding to the arc-shaped surface.
3. The lower chord connection structure of a jib of a flat head tower crane according to claim 1, wherein the angle of the inclined surface of the wedge is set at 80-85 °.
4. The lower chord connecting structure of a jib of a flat-head tower crane according to claim 1, wherein a radial through hole is formed on the lower side part of the wedge block, and the locking mechanism further comprises a cotter pin which is matched and locked with the radial through hole.
5. The lower chord connecting structure of a jib of a flat head tower crane according to claim 1, wherein the distance between the wall of the radial through groove at the side close to the tail part of the pin shaft and the baffle is D1, and the thickness of each connecting plate is D2, and is more than 0 and less than or equal to 3mm and more than D1-2D 2.
6. The lower chord connecting structure of a jib of a flat head tower crane according to claim 1, wherein there are two sets of positioning holes on the connecting plate, and the two sets of positioning holes are respectively arranged at the end parts close to the two lower chords on the same single-section arm.
7. The bottom chord connecting structure of a jib of a flat head tower crane of claim 1, wherein at least one side wall in the notch of the radial through groove is rough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023337537.7U CN214570313U (en) | 2020-12-31 | 2020-12-31 | Lower chord connecting structure of cargo boom of flat-top tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023337537.7U CN214570313U (en) | 2020-12-31 | 2020-12-31 | Lower chord connecting structure of cargo boom of flat-top tower crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214570313U true CN214570313U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023337537.7U Active CN214570313U (en) | 2020-12-31 | 2020-12-31 | Lower chord connecting structure of cargo boom of flat-top tower crane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4299501A1 (en) * | 2022-06-30 | 2024-01-03 | WOLFFKRAN Holding AG | Connecting device for connecting boom segments of a boom of a tower crane |
| WO2024003167A1 (en) * | 2022-06-30 | 2024-01-04 | Wolffkran Holding Ag | Connection device for connecting jib segments of a jib of a tower crane |
| CN117529443A (en) * | 2022-06-30 | 2024-02-06 | 沃尔夫控股公司 | Connecting device for connecting boom sections of a tower crane boom |
-
2020
- 2020-12-31 CN CN202023337537.7U patent/CN214570313U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4299501A1 (en) * | 2022-06-30 | 2024-01-03 | WOLFFKRAN Holding AG | Connecting device for connecting boom segments of a boom of a tower crane |
| WO2024003167A1 (en) * | 2022-06-30 | 2024-01-04 | Wolffkran Holding Ag | Connection device for connecting jib segments of a jib of a tower crane |
| CN117529443A (en) * | 2022-06-30 | 2024-02-06 | 沃尔夫控股公司 | Connecting device for connecting boom sections of a tower crane boom |
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