Telescopic arm device and mobile crane

Abstract

The application belongs to the technical field of engineering mechanical equipment, and particularly relates to a telescopic arm device and a lorry-mounted crane. The telescopic arm device comprises a first oil cylinder, a second oil cylinder, a third oil cylinder, a cable assembly, and a first basic arm section, a second arm section, a third arm section, a fourth arm section, a fifth arm section, a sixth arm section and a seventh arm section which are nested with each other. In the process of extension of the telescopic arm device, the first oil cylinder is extended to drive the second arm section to extend, the second oil cylinder is extended to drive the third arm section to extend, the third oil cylinder is extended to drive the fourth arm section to extend, and the cable assembly drives the fifth arm section, the sixth arm section and the seventh arm section to synchronously extend. In the application, the connection between the oil cylinders is strengthened by hinging the piston rod of the second oil cylinder with the cylinder body of the first oil cylinder and hinging the piston rod of the third oil cylinder with the cylinder body of the second oil cylinder, so that the rigidity of the whole oil cylinder is improved, and the stability of the telescopic arm device in the telescoping process is improved.

Description

Technical Field

[0001] This application belongs to the technical field of engineering machinery and equipment, specifically relating to a telescopic boom device and a truck-mounted crane. Background Technology

[0002] Telescopic boom devices consist of multiple boom sections and can extend and retract freely. The number of boom sections significantly affects the performance of the telescopic boom device. The extension and retraction of the telescopic boom device is achieved by hydraulic cylinders and cables connecting adjacent boom sections. Different numbers of boom sections require different selections of the number of hydraulic cylinders, cables, cylinder connection methods, and cable routing paths. In particular, for telescopic boom devices with a large number of boom sections, it is necessary to improve the cylinder connection methods and cable routing paths to ensure a more stable and safe extension and retraction process. Currently, the stability of the extension and retraction process of telescopic boom devices with seven boom sections still needs to be improved. Utility Model Content

[0003] The purpose of this application is to provide a telescopic boom device that aims to improve the stability of the telescopic process of a multi-section telescopic boom device.

[0004] To achieve the above objectives, this application provides a telescopic boom device, comprising:

[0005] The cylindrical basic arm section, second arm section, third arm section, fourth arm section, fifth arm section, sixth arm section and seventh arm section are assembled in a nested manner;

[0006] The first hydraulic cylinder has a piston rod connected to the rear of the cylindrical basic arm section, and the cylinder body of the first hydraulic cylinder is hinged to the rear of the second arm section.

[0007] The second hydraulic cylinder has its piston rod hinged to the cylinder body of the first hydraulic cylinder, and the cylinder body of the second hydraulic cylinder is hinged to the rear part of the third boom section.

[0008] The third hydraulic cylinder has its piston rod hinged to the cylinder body of the second hydraulic cylinder, and the cylinder body of the third hydraulic cylinder is hinged to the rear part of the fourth boom section.

[0009] The cable assembly includes a first cable, a second cable, a third cable, and a fourth cable. The first cable connects the front of the fourth arm segment to the rear of the fifth arm segment; the second cable connects the front of the fifth arm segment to the rear of the sixth arm segment; the third cable connects the front of the sixth arm segment to the rear of the seventh arm segment; and the fourth cable connects the rear of the fourth arm segment to the front of the seventh arm segment.

[0010] In some embodiments, a first connecting frame is fitted at the rear of the cylinder body of the first hydraulic cylinder, the first connecting frame having a first oblong hole and a first round hole, a second arm shaft hole is formed at the rear of the second arm section, a second rod shaft hole is formed on the piston rod of the second hydraulic cylinder, and the telescopic arm device includes a second arm pin and a second rod pin, the second arm pin passing through the second arm shaft hole and the first oblong hole, and the second rod pin passing through the second rod shaft hole and the first round hole;

[0011] The second cylinder body has a second connecting frame fitted at the rear. The second connecting frame has a second oblong hole and a second round hole. The third arm section has a third arm shaft hole at the rear. The piston rod of the third cylinder has a third rod shaft hole. The telescopic arm device includes a third arm pin and a third rod pin. The third arm pin passes through the third arm shaft hole and the second oblong hole. The third rod pin passes through the third rod shaft hole and the second round hole.

[0012] In some embodiments, the first connecting frame includes a first sleeve portion and a first connecting portion. The number of the first connecting portions is two, and the two first connecting portions are arranged parallel to each other in the left-right direction below the first sleeve portion. The first sleeve portion is sleeved on the cylinder body of the first hydraulic cylinder. The second hydraulic cylinder is located below the first hydraulic cylinder, and the piston rod of the second hydraulic cylinder extends into the space between the two first connecting portions.

[0013] The second connecting frame includes a second sleeve portion and a second connecting portion. There are two second connecting portions, and the two second connecting portions are arranged parallel to each other in the left-right direction below the second sleeve portion. The second sleeve portion is sleeved on the cylinder body of the second oil cylinder. The third oil cylinder is located below the second oil cylinder, and the piston rod of the third oil cylinder extends between the two second connecting portions.

[0014] In some embodiments, the cable assembly further includes a first half-pulley and a second half-pulley disposed at the rear of the fifth arm section, a first pulley disposed at the front of the fourth arm section, and a first cable support disposed at the front of the third arm section. The first half-pulley and the second half-pulley are both located behind the first pulley, and the first half-pulley is located behind the second half-pulley. There are two first cables and two first pulleys. One first cable is wound around the first half-pulley and one of the first pulleys, and the other first cable is wound around the second half-pulley and the other first pulley. Both ends of the two first cables are fixed to the first cable support.

[0015] In some embodiments, the first pulley has a double groove structure, and the first cable is a double-strand rope structure.

[0016] In some embodiments, the cable assembly further includes a third half pulley disposed at the rear of the sixth arm section, a second pulley disposed at the front of the fifth arm section, and a second cable support disposed at the front of the fourth arm section. The third half pulley is located behind the second pulley, and the second cable passes around the third half pulley and the second pulley, with both ends of the second cable fixed to the second cable support.

[0017] In some embodiments, the cable assembly further includes a fourth half pulley disposed at the rear of the seventh arm section, a third pulley disposed at the front of the sixth arm section, and a third cable support disposed at the front of the fifth arm section. The fourth half pulley is located behind the third pulley, and the third cable passes around the fourth half pulley and the third pulley, with both ends of the third cable fixed to the third cable support.

[0018] In some embodiments, the cable assembly further includes a fifth half pulley disposed at the front of the seventh arm section, a fourth pulley disposed at the rear of the cylinder body of the third cylinder, a fifth pulley disposed at the front of the cylinder body of the second cylinder, a sixth pulley disposed at the rear of the fourth arm section, and a fourth cable support disposed at the front of the third arm section. The fourth cable passes around the fifth half pulley, the fourth pulley, the fifth pulley, and the sixth pulley, and both ends of the fourth cable are fixed to the fourth cable support.

[0019] In some embodiments, the front part of the cylinder body of the third cylinder is provided with a side pulley bracket and a bottom pulley bracket. The side pulley bracket extends upward from the third cylinder, and the bottom pulley bracket extends forward from the third cylinder. Both the side pulley bracket and the bottom pulley bracket are provided with guide pulleys, which are used to roll with the inner peripheral wall of the seventh arm section.

[0020] Another aspect of this application provides a truck-mounted crane, including the telescopic boom device described above.

[0021] Through the above technical solutions, the telescopic boom device and truck-mounted crane provided in this application have the following beneficial effects:

[0022] During the extension of the telescopic boom, the first cylinder extends, causing the second boom section to extend from its cylindrical basic boom section. The second cylinder extends, causing the third boom section to extend from its second boom section. The third cylinder extends, causing the fourth boom section to extend from its third boom section. Simultaneously, the fourth boom section, via the first, second, and third cables, causes the fifth, sixth, and seventh boom sections to extend synchronously, completing the extension of all boom sections and enabling lifting operations. During the retraction of the telescopic boom, the third cylinder retracts, causing the fourth boom section to retract from its third boom section. Simultaneously, the fourth boom section, via the fourth, third, and second cables, causes the seventh, sixth, and fifth boom sections to retract synchronously, completing the retraction of all boom sections. In this application, the interconnection between the first and second cylinders, and between the second and third cylinders, enhances the overall rigidity of the cylinders, thereby improving the stability of the telescopic boom during its extension and retraction.

[0023] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0025] Figure 1 This is a top view of the telescopic arm device according to a specific embodiment of this application;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0027] Figure 3 for Figure 1 Cross-sectional schematic diagram of BB;

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of section C;

[0029] Figure 5 for Figure 3 An enlarged schematic diagram of section D in the middle;

[0030] Figure 6 This is a structural diagram of the first hydraulic cylinder according to a specific embodiment of this application;

[0031] Figure 7 This is a structural diagram of the second hydraulic cylinder according to a specific embodiment of this application;

[0032] Figure 8 This is a structural diagram of the third hydraulic cylinder according to a specific embodiment of this application.

[0033] Explanation of reference numerals in the attached figures

[0034] 100. Telescopic boom device; 1. Basic cylindrical boom section; 2. Second boom section; 3. Third boom section; 4. Fourth boom section; 5. Fifth boom section; 6. Sixth boom section; 7. Seventh boom section; 8. First hydraulic cylinder; 9. Second hydraulic cylinder; 10. Third hydraulic cylinder; 11. First cable; 12. Second cable; 13. Third cable; 14. Fourth cable; 15. First connecting frame; 16. Second connecting frame; 17. First half-pulley; 8. Second half pulley; 19. First pulley; 20. First cable support; 21. Third half pulley; 22. Second pulley; 23. Second cable support; 24. Fourth half pulley; 25. Third pulley; 26. Third cable support; 27. Fifth half pulley; 28. Fourth pulley; 29. ​​Fifth pulley; 30. Sixth pulley; 31. Fourth cable support; 32. Side pulley bracket; 33. Bottom pulley bracket; 34. Guide pulley. Detailed Implementation

[0035] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0036] The terminology of the telescopic boom device and truck-mounted crane according to this application is described below with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 2As shown, a specific embodiment of this application provides a telescopic boom device 100, including a first hydraulic cylinder 8, a second hydraulic cylinder 9, a third hydraulic cylinder 10, a cable assembly, and mutually nested cylindrical basic boom sections 1, 2, 3, 4, 5, 6, and 7. The piston rod of the first hydraulic cylinder 8 is connected to the rear of the cylindrical basic boom section 1, and the cylinder body of the first hydraulic cylinder 8 is hinged to the rear of the second boom section 2. The piston rod of the second hydraulic cylinder 9 is hinged to the cylinder body of the first hydraulic cylinder 8, and the cylinder body of the second hydraulic cylinder 9 is hinged to the rear of the third boom section 3. The piston rod of the third cylinder 10 is hinged to the cylinder body of the second cylinder 9, and the cylinder body of the third cylinder 10 is hinged to the rear part of the fourth arm section 4; the cable assembly includes a first cable 11, a second cable 12, a third cable 13, and a fourth cable 14. The first cable 11 connects the front part of the fourth arm section 4 and the rear part of the fifth arm section 5; the second cable 12 connects the front part of the fifth arm section 5 and the rear part of the sixth arm section 6; the third cable 13 connects the front part of the sixth arm section 6 and the rear part of the seventh arm section 7; and the fourth cable 14 connects the rear part of the fourth arm section 4 and the front part of the seventh arm section 7.

[0038] During the extension of the telescopic boom device 100, the first cylinder 8 extends, causing the second boom section 2 to extend out of the cylindrical basic boom section 1; the second cylinder 9 extends, causing the third boom section 3 to extend out of the second boom section 2; and the third cylinder 10 extends, causing the fourth boom section 4 to extend out of the third boom section 3. Since each boom section of the telescopic boom device 100 is relatively long, and the maximum extension length of each cylinder must be at least equal to the length of the corresponding boom section to complete the extension of that section—that is, the maximum extension length of the first cylinder 8 is equal to the length of the second boom section 2—and each boom section has a large self-weight, the first cylinder 8, the second cylinder 9, and the third cylinder 10 need to have sufficient rigidity to stably complete the extension and retraction of each boom section over a long period. In this application, the overall rigidity of the cylinders is improved by connecting the first cylinder 8 and the second cylinder 9, and by connecting the second cylinder 9 and the third cylinder 10, thereby improving the stability of the telescopic boom device 100 during the extension and retraction process.

[0039] It should be noted that a hydraulic cylinder consists of a piston rod and a cylinder body, and the maximum extension length of a hydraulic cylinder refers to the maximum length of the piston rod extending out of the cylinder body.

[0040] It should be noted that, in the description of this application, unless otherwise stated, the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In the specific embodiments of this application, "front-back direction" refers to the extension direction of the telescopic arm device 100, "left-right direction" and "up-down direction" are two mutually perpendicular directions in a plane perpendicular to the front-back direction, "up-down direction" is the vertical direction, and "left-right direction" is the horizontal direction, wherein the specific orientations of "up," "down," "left," "right," "front," and "back" are shown by the arrows in the accompanying drawings.

[0041] like Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments, a first connecting frame 15 is fitted at the rear of the cylinder body of the first cylinder 8. The first connecting frame 15 has a first oblong hole and a first round hole. A second arm shaft hole is formed at the rear of the second arm section 2. A second rod shaft hole is formed on the piston rod of the second cylinder 9. The telescopic arm device 100 includes a second arm pin and a second rod pin. The second arm pin passes through the second arm shaft hole and the first oblong hole, and the second rod pin passes through the second rod shaft hole and the first round hole. A second connecting frame 16 is fitted at the rear of the cylinder body of the second cylinder 9. The second connecting frame 16 has a second oblong hole and a second round hole. A third arm shaft hole is formed at the rear of the third arm section 3. A third rod shaft hole is formed on the piston rod of the third cylinder 10. The telescopic arm device 100 includes a third arm pin and a third rod pin. The third arm pin passes through the third arm shaft hole and the second oblong hole, and the third rod pin passes through the third rod shaft hole and the second round hole.

[0042] Specifically, the first connecting frame 15 includes a first sleeve portion and a first connecting portion. There are two first connecting portions, and the two first connecting portions are arranged parallel to each other in the left-right direction below the first sleeve portion. The first sleeve portion is fitted onto the cylinder body of the first hydraulic cylinder 8. The second hydraulic cylinder 9 is located below the first hydraulic cylinder 8, and the piston rod of the second hydraulic cylinder 9 extends into the space between the two first connecting portions. The second connecting frame 16 includes a second sleeve portion and a second connecting portion. There are two second connecting portions, and the two second connecting portions are arranged parallel to each other in the left-right direction below the second sleeve portion. The second sleeve portion is fitted onto the cylinder body of the second hydraulic cylinder 9. The third hydraulic cylinder 10 is located below the second hydraulic cylinder 9, and the piston rod of the third hydraulic cylinder 10 extends into the space between the two second connecting portions.

[0043] The traditional method of connecting hydraulic cylinders involves directly connecting them to adjacent boom sections. Before installing each cylinder, its placement must be considered to avoid interference after assembly. Furthermore, the placement of openings on each boom section must also be considered to ensure proper connection between the assembled cylinders and their corresponding boom sections. In this application, by using a first connecting bracket 15 and a second connecting bracket 16 to connect the first hydraulic cylinder 8, the second hydraulic cylinder 9, and the third hydraulic cylinder 10, only the relative positions of the first boom shaft hole on the cylindrical basic boom section 1, the second boom shaft hole on the second boom section 2, and the third boom shaft hole on the third boom section 3 need to be considered. This significantly improves the assembly speed of the first hydraulic cylinder 8, the second hydraulic cylinder 9, and the third hydraulic cylinder 10.

[0044] Meanwhile, a waist-shaped hole is provided on the first connecting part to avoid the influence of machining errors, thereby facilitating the assembly of the connecting frame and the boom section.

[0045] like Figures 2 to 5 As shown, in some embodiments, the cable assembly further includes a first half pulley 17 and a second half pulley 18 disposed at the rear of the fifth arm section 5, a first pulley 19 disposed at the front of the fourth arm section 4, and a first cable support 20 disposed at the front of the third arm section 3. The first half pulley 17 and the second half pulley 18 are both located behind the first pulley 19, and the first half pulley 17 is located behind the second half pulley 18.

[0046] Specifically, there are two first cables 11, two first pulleys 19 and two first cable supports 20. The first cable supports 20 are arranged above the front of the third arm section 3 and the two first cable supports 20 are arranged alternately in the left and right direction. The two first pulleys 19 are arranged above the front of the fourth arm section 4 and the two first pulleys 19 are arranged alternately in the left and right direction. The two first pulleys 19 and the two first cable supports 20 are arranged alternately in the front and back direction.

[0047] One of the first cables 11 is wound around the first half pulley 17 and the first pulley 19 located on the left, and both ends are fixed to the first cable support 20 located on the left. The other first cable 11 is wound around the second half pulley 18 and the first pulley 19 located on the right, and both ends are fixed to the first cable support 20 located on the right.

[0048] Since the extension and retraction of the fifth, sixth, and seventh boom sections are all driven by cables, setting the number of first cables 11 to two helps to reduce the force on a single first cable 11, thereby reducing the amplitude of vibration of a single first cable 11 under force, thus improving the stability of the extension and retraction of the fifth, sixth, and seventh boom sections, and further improving the stability of the extension and retraction process of the telescopic boom device 100.

[0049] Optionally, the first pulley 19 has a double-groove structure, and the first cable 11 is a double-strand rope structure, with the two strands of the double-strand rope wound one-to-one in the two grooves of the double-groove structure. This arrangement can further reduce the vibration amplitude of the first cable 11 under force, thereby further improving the stability of the extension and retraction of the fifth, sixth, and seventh arm sections, and thus improving the stability of the telescopic boom device 100 during the extension and retraction process.

[0050] like Figures 2 to 5 As shown, in some embodiments, the cable assembly further includes a third half pulley 21 disposed at the rear of the sixth arm section 6, a second pulley 22 disposed above the front of the outer peripheral wall of the fifth arm section 5, and a second cable support 23 disposed above the front of the outer peripheral wall of the fourth arm section 4. The second cable support 23 is located behind the second pulley 22, and the third half pulley 21 is located behind the second cable support 23. There are two second pulleys 22, and the two second pulleys 22 are aligned in the left-right direction. The second cable 12 passes around the third half pulley 21 and the two second pulleys 22, and both ends of the second cable 12 are fixed on the second cable support 23.

[0051] The cable assembly also includes a fourth half pulley 24 located at the rear of the seventh arm section 7, a third pulley 25 located at the front of the sixth arm section 6, and a third cable support 26 located at the front of the fifth arm section 5. The third cable support 26 is located behind the third pulley 25, and the fourth half pulley 24 is located behind the third pulley 25. There are two third pulleys 25, and the two third pulleys 25 are arranged alternately in the left-right direction. There are two third cable supports 26, and the two third cable supports 26 are arranged alternately with the two third pulleys 25 in the front-back direction. The third cable 13 passes over the fourth half pulley 24 and the two third pulleys 25, and both ends of the third cable 13 are fixed to the two third cable supports 26 respectively.

[0052] Specifically, the second cable support 23 is arranged between the two first pulleys 19, and the second pulley 22 is arranged between the two third cable supports 26, so as to make full use of the space above the boom section, thereby eliminating the need to increase the size of the boom section to arrange the cable assembly, which in turn facilitates the reduction of the size of the telescopic boom device 100.

[0053] It should be noted that since the second cable 12 and the third cable 13 are subjected to less force than the first cable 11, setting the second cable 12 and the third cable 13 as a single-strand rope structure is beneficial to reduce strength redundancy, thereby reducing the production cost and assembly difficulty of the telescopic boom device 100. However, the second cable 12 and the third cable 13 can also be set as a double-strand rope structure and the second pulley 22 and the third pulley 25 can be set as a double-groove structure according to actual needs, so as to improve the stability of the telescopic boom device 100 during the telescopic process.

[0054] like Figures 2 to 5 As shown, in some embodiments, the cable assembly further includes a fifth half pulley 27 disposed at the front of the seventh arm section 7, a fourth pulley 28 disposed at the rear of the cylinder body of the third cylinder 10, a fifth pulley 29 disposed at the front of the cylinder body of the second cylinder 9, a sixth pulley 30 disposed at the rear of the fourth arm section 4, and a fourth cable support 31 disposed at the front of the third arm section 3.

[0055] Specifically, the sixth pulley 30 is located above the fifth pulley 29, the fifth pulley 29 is located above the fourth pulley 28, and there are two of each of the fourth pulley 28, the fifth pulley 29 and the sixth pulley 30. The fourth cable 14 passes over the fifth half pulley 27, the two fourth pulleys 28, the two fifth pulleys 29 and the two sixth pulleys 30, and both ends of the fourth cable 14 are fixed to the fourth cable support 31.

[0056] Furthermore, a connecting vertical plate is provided on the front part of the inner peripheral wall of the seventh arm section 7, and the fourth half pulley 24 is connected to the connecting vertical plate of the seventh arm section 7 by a screw.

[0057] Optionally, the fourth cable support 31 is located below the first cable support 20 to make full use of the space above the boom segment, so as not to increase the size of the boom segment to arrange the cable assembly, thereby facilitating the reduction of the size of the telescopic boom device 100.

[0058] like Figure 8 As shown, in some embodiments, the front part of the cylinder body of the third cylinder 10 is provided with a side pulley bracket 32 ​​and a bottom pulley bracket 33. The side pulley bracket 32 ​​extends upward from the third cylinder 10, and the bottom pulley bracket 33 extends forward from the third cylinder 10. Both the side pulley bracket 32 ​​and the bottom pulley bracket 33 are provided with guide pulleys 34, which are used to roll with the inner peripheral wall of the seventh arm section 7.

[0059] Specifically, the bottom pulley bracket 33 includes two longitudinal plates and two first horizontal plates. The two longitudinal plates extend in the front-to-back direction and are spaced apart in the left-to-right direction. The two first horizontal plates extend in the front-to-back direction and are spaced apart in the up-down direction. A roller pin extending in the left-to-right direction is provided between the two longitudinal plates, and two roller pins extending in the up-down direction are provided between the two first horizontal plates. The side pulley bracket 32 ​​includes two vertical plates and two second horizontal plates. The two vertical plates extend in the up-down direction and are spaced apart in the left-to-right direction. The two second horizontal plates extend in the front-to-back direction and are spaced apart in the up-down direction. A roller pin extending in the left-to-right direction is provided between the two vertical plates, and two roller pins extending in the up direction are provided between the two second horizontal plates. A guide pulley 34 is fitted on each roller pin. In this application, multiple guide pulleys 34 are set to roll with the inner peripheral wall of the seventh boom section 7 to avoid collision between the hydraulic cylinder and the seventh boom section 7, and at the same time to avoid hard friction between each boom section due to manufacturing clearance errors. This avoids wear and abnormal noise between the hydraulic cylinder and the seventh boom section 7 and adjacent boom sections, and also helps to improve the telescopic stability of the telescopic boom device 100.

[0060] In some embodiments, the telescopic boom device 100 includes a cylinder triggering assembly, which includes a first sequence control valve and a first adjusting valve rod arranged in a front-rear direction, a second sequence control valve and a second adjusting valve rod arranged in a front-rear direction, wherein the first sequence control valve is disposed on the front end face of the cylinder body of the first cylinder 8, the first adjusting valve rod is disposed above the front part of the cylinder body of the second cylinder 9, the second sequence control valve is disposed on the front end face of the cylinder body of the second cylinder 9, and the second adjusting valve rod is disposed above the front part of the cylinder body of the third cylinder 10.

[0061] Specifically, after the first cylinder 8 extends to its full position, the first adjusting valve rod on the second cylinder 9 can trigger the first sequence control valve on the first cylinder 8 to adjust the oil circuit, thereby driving the second cylinder 9 to begin extending; after the second cylinder 9 extends to its full position, the second adjusting valve rod on the third cylinder 10 can trigger the second sequence control valve on the second cylinder 9 to adjust the oil circuit, thereby driving the third cylinder 10 to begin extending; after the third cylinder 10 retracts to its full position, the second adjusting valve rod on the third cylinder 10 can trigger the second sequence control valve on the second cylinder 9 to adjust the oil circuit, thereby driving the second cylinder 9 to begin retracting; after the third cylinder 10 retracts to its full position, the first adjusting valve rod on the second cylinder 9 can trigger the first sequence control valve on the first cylinder 8 to adjust the oil circuit, thereby driving the first cylinder 8 to begin retracting.

[0062] It should be noted that the structure and working principle of the sequential control valve and the regulating valve stem are well known to those skilled in the art and are not part of the core inventive point of this application, so they will not be described in detail here.

[0063] The extension process of the telescopic boom device 100 provided in this application is as follows:

[0064] First, the first hydraulic cylinder 8 extends, causing the second arm section 2, the third arm section 3, the fourth arm section 4, the fifth arm section 5, the sixth arm section 6, and the seventh arm section 7 to extend outward as a whole from the cylindrical basic arm section 1. Then, after the first hydraulic cylinder 8 has extended, the second hydraulic cylinder 9 extends, causing the third arm section 3, the fourth arm section 4, the fifth arm section 5, the sixth arm section 6, and the seventh arm section 7 to extend outward as a whole from the second arm section 2. Finally, after the second hydraulic cylinder 9 has extended, the third hydraulic cylinder 10 extends, causing the fourth arm section 4, the fifth arm section 5, the sixth arm section 6, and the seventh arm section 7 to extend outward as a whole from the third arm section 3. At the same time, the fourth arm section 4 pulls the fifth arm section 5 outward through the first cable 11, the fifth arm section 5 pulls the sixth arm section 6 outward through the second cable 12, and the sixth arm section 6 pulls the seventh arm section 7 outward through the third cable 13.

[0065] The retraction process of the telescopic boom device 100 provided in this application is as follows:

[0066] First, the retraction of the third cylinder 10 causes the fourth boom section 4, the fifth boom section 5, the sixth boom section 6, and the seventh boom section 7 to retract inwards as a whole into the third boom section 3. Simultaneously, the fourth boom section 4, via the fourth cable 14, pulls the seventh boom section 7 inwards into the sixth boom section 6. The seventh boom section 7, via the third cable 13, pulls the sixth boom section 6 inwards into the fifth boom section 5. Finally, the sixth boom section 6, via the second cable 12, pulls the fifth boom section 5 inwards into the fourth boom section. 4; Then, after the third cylinder 10 retracts, the second cylinder 9 retracts, causing the third arm section 3, the fourth arm section 4, the fifth arm section 5, the sixth arm section 6, and the seventh arm section 7 to retract into the second arm section 2 as a whole; Finally, after the second cylinder 9 retracts, the first cylinder 8 retracts, causing the second arm section 2, the third arm section 3, the fourth arm section 4, the fifth arm section 5, the sixth arm section 6, and the seventh arm section 7 to retract into the cylindrical basic arm section 1 as a whole.

[0067] In this application, the overall rigidity of the cylinders is improved by connecting the first cylinder 8, the second cylinder 9, and the third cylinder 10. The stress on each strand of the first cable 11 is reduced by setting the first pulley 19 as a double-groove structure and the first cable 11 as a double-strand rope structure, thereby improving the stability of the first cable 11 during the stretching process. Thus, the stability of the telescopic boom device 100, which includes multiple boom sections, is improved during the telescopic process from both the cylinder and cable assemblies. While increasing the number of boom sections to increase the working range of the telescopic boom device 100, the operational stability of the telescopic boom device 100 is also guaranteed.

[0068] A specific embodiment of this application also provides a truck-mounted crane, including the telescopic boom device 100 as described above. Since the truck-mounted crane employs all embodiments of the telescopic boom device 100, it possesses all the beneficial effects of the telescopic boom device 100.

[0069] Those skilled in the art will understand that, in addition to applying the telescopic boom device 100 to truck-mounted cranes, it can also be applied to construction machinery such as truck cranes and crawler cranes.

[0070] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A telescopic boom device, characterized in that, include: The cylindrical basic arm section (1), second arm section (2), third arm section (3), fourth arm section (4), fifth arm section (5), sixth arm section (6) and seventh arm section (7) are nested together. The first oil cylinder (8) has a piston rod connected to the rear of the cylindrical basic arm section (1) and the cylinder body of the first oil cylinder (8) is hinged to the rear of the second arm section (2). The second oil cylinder (9) has its piston rod hinged to the cylinder body of the first oil cylinder (8), and the cylinder body of the second oil cylinder (9) is hinged to the rear part of the third arm section (3). The third oil cylinder (10) has its piston rod hinged to the cylinder body of the second oil cylinder (9), and the cylinder body of the third oil cylinder (10) is hinged to the rear part of the fourth arm section (4). The cable assembly includes a first cable (11), a second cable (12), a third cable (13), and a fourth cable (14). The first cable (11) connects the front of the fourth arm section (4) and the rear of the fifth arm section (5). The second cable (12) connects the front of the fifth arm section (5) and the rear of the sixth arm section (6). The third cable (13) connects the front of the sixth arm section (6) and the rear of the seventh arm section (7). The fourth cable (14) connects the rear of the fourth arm section (4) and the front of the seventh arm section (7).

2. The telescopic boom device according to claim 1, characterized in that, The first connecting frame (15) is sleeved on the rear part of the cylinder body of the first oil cylinder (8). The first connecting frame (15) has a first waist-shaped hole and a first round hole. The rear part of the second arm section (2) has a second arm shaft hole. The piston rod of the second oil cylinder (9) has a second rod shaft hole. The telescopic arm device (100) includes a second arm pin and a second rod pin. The second arm pin passes through the second arm shaft hole and the first waist-shaped hole. The second rod pin passes through the second rod shaft hole and the first round hole. The second connecting frame (16) is sleeved on the rear part of the cylinder body of the second oil cylinder (9). The second connecting frame (16) has a second waist-shaped hole and a second round hole. The rear part of the third arm section (3) has a third arm shaft hole. The piston rod of the third oil cylinder (10) has a third rod shaft hole. The telescopic arm device (100) includes a third arm pin and a third rod pin. The third arm pin passes through the third arm shaft hole and the second waist-shaped hole. The third rod pin passes through the third rod shaft hole and the second round hole.

3. The telescopic arm device according to claim 2, characterized in that, The first connecting frame (15) includes a first sleeve part and a first connecting part. There are two first connecting parts, and the two first connecting parts are arranged parallel to each other in the left and right direction below the first sleeve part. The first sleeve part is sleeved on the cylinder body of the first oil cylinder (8). The second oil cylinder (9) is located below the first oil cylinder (8), and the piston rod of the second oil cylinder (9) extends into the space between the two first connecting parts. The second connecting frame (16) includes a second sleeve and a second connecting part. There are two second connecting parts, and the two second connecting parts are arranged parallel to each other in the left and right direction below the second sleeve. The second sleeve is sleeved on the cylinder body of the second oil cylinder (9). The third oil cylinder (10) is located below the second oil cylinder (9), and the piston rod of the third oil cylinder (10) extends between the two second connecting parts.

4. The telescopic boom device according to claim 1, characterized in that, The cable assembly also includes a first half pulley (17) and a second half pulley (18) located at the rear of the fifth arm section (5), a first pulley (19) located at the front of the fourth arm section (4), and a first cable support (20) located at the front of the third arm section (3). The first half pulley (17) and the second half pulley (18) are both located behind the first pulley (19), and the first half pulley (17) is located behind the second half pulley (18). There are two first cables (11) and two first pulleys (19). One first cable (11) is wound around the first half pulley (17) and one of the first pulleys (19), and the other first cable (11) is wound around the second half pulley (18) and the other first pulley (19). Both ends of the two first cables (11) are fixed to the first cable support (20).

5. The telescopic arm device according to claim 4, characterized in that, The first pulley (19) has a double groove structure, and the first cable (11) is a double-strand rope structure.

6. The telescopic boom device according to any one of claims 1 to 5, characterized in that, The cable assembly also includes a third half pulley (21) located at the rear of the sixth arm section (6), a second pulley (22) located at the front of the fifth arm section (5), and a second cable support (23) located at the front of the fourth arm section (4). The third half pulley (21) is located behind the second pulley (22), and the second cable (12) passes around the third half pulley (21) and the second pulley (22), with both ends of the second cable (12) fixed to the second cable support (23).

7. The telescopic boom device according to any one of claims 1 to 5, characterized in that, The cable assembly also includes a fourth half pulley (24) located at the rear of the seventh arm section (7), a third pulley (25) located at the front of the sixth arm section (6), and a third cable support (26) located at the front of the fifth arm section (5). The fourth half pulley (24) is located behind the third pulley (25). The third cable (13) passes around the fourth half pulley (24) and the third pulley (25), and both ends of the third cable (13) are fixed to the third cable support (26).

8. The telescopic boom device according to any one of claims 1 to 5, characterized in that, The cable assembly also includes a fifth half pulley (27) located at the front of the seventh arm section (7), a fourth pulley (28) located at the rear of the cylinder body of the third cylinder (10), a fifth pulley (29) located at the front of the cylinder body of the second cylinder (9), a sixth pulley (30) located at the rear of the fourth arm section (4), and a fourth cable support (31) located at the front of the third arm section (3). The fourth cable (14) passes over the fifth half pulley (27), the fourth pulley (28), the fifth pulley (29), and the sixth pulley (30), and both ends of the fourth cable (14) are fixed on the fourth cable support (31).

9. The telescopic boom device according to any one of claims 1 to 5, characterized in that, The front part of the cylinder body of the third cylinder (10) is provided with a side pulley bracket (32) and a bottom pulley bracket (33). The side pulley bracket (32) extends upward from the third cylinder (10), and the bottom pulley bracket (33) extends forward from the third cylinder (10). Both the side pulley bracket (32) and the bottom pulley bracket (33) are provided with guide pulleys (34). The guide pulleys (34) are used to roll with the inner peripheral wall of the seventh arm section (7).

10. A truck-mounted crane, characterized in that, Includes the telescopic boom device (100) according to any one of claims 1 to 9.

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