Sectionally controlled telescoping boom
By dividing the boom's telescopic arm into two groups and using segmented control components, the problem of uncontrolled telescopic sequence in existing technologies is solved, enabling the boom to operate flexibly and efficiently in low-ceilinged spaces and ensuring stable telescopic speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU HONGCHANG TIANMA LOGISTICS EQUIP CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-19
AI Technical Summary
The extension and retraction sequence of the boom of existing knuckle boom cranes is uncontrolled, resulting in pressure loss, inconsistent flow, and large differences in extension and retraction speeds. Furthermore, when used in low-ceilinged spaces, it is impossible to achieve cross-stage control of the hydraulic cylinders, leading to inefficient operation.
The boom's telescopic boom is divided into two groups, using segmented control components and independent telescopic cylinders. The front and rear telescopic booms are independently controlled through multi-way valves, balance valves, and switching valves. Combined with a hose reel and length and angle sensors, the boom's telescopic movement is precisely controlled.
It achieves flexibility and efficiency in low-ceilinged operations, improves the stability and accuracy of telescopic speed, reduces pressure loss, and enhances the ability to operate in complex environments.
Smart Images
Figure CN224377526U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a segmented control telescopic boom, belonging to the field of crane technology. Background Technology
[0002] The boom of a knuckle boom crane has a corresponding telescopic cylinder for each section. The boom's extension and retraction are affected by the cylinder diameter and the friction of structural components, making the extension and retraction sequence uncontrollable. To address this, sequence valves or stroke valves are added between the cylinders to disconnect the connecting oil circuit between two cylinders, thus achieving sequential extension and retraction. However, sequentially telescopic booms have the following drawbacks:
[0003] 1) Pressure loss will occur; 2) All cylinders have the same flow rate, but the extension and retraction speeds vary greatly; 3) When used in low-ceilinged spaces, due to structural limitations (small cross-section booms cannot be used preferentially), it is impossible to achieve cross-level control of the cylinders, which is not efficient enough. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a segmented control telescopic boom that divides the telescopic boom into two groups. Based on the operation conditions in low-ceilinged spaces, it enables step-by-step control of the telescopic cylinders, allowing independent control of the extension and retraction of the front and rear telescopic booms.
[0005] The technical solution of this utility model is as follows:
[0006] A segmented telescopic boom, characterized by comprising a multi-way valve, several telescopic booms, several telescopic cylinders, and a segmented control assembly; the telescopic booms are sequentially divided into a first group and a second group, and similarly, the telescopic cylinders are divided into a corresponding first group and a second group; the segmented control assembly includes a first balance valve and a switching valve, the first balance valve and the switching valve being connected to the multi-way valve via hydraulic lines; the first balance valve is connected to the inlet and return oil chambers of the first group of telescopic cylinders via hydraulic lines, and the switching valve is connected to the inlet and return oil chambers of the second group of telescopic cylinders via hydraulic lines, forming a two-way control oil circuit.
[0007] In the above scheme, taking the basic boom as a reference, the first few sections of the telescopic boom are the first segment (group), and the last few sections of the telescopic boom are the second segment (group). The telescopic boom is divided into two segments (two groups) for control. The appropriate flow rate can be matched according to different cylinders to ensure the stability of the telescopic speed. The segmented control improves the ability to work in low-ceilinged spaces. The first section of the boom with a larger cross-section is used for heavy loads, and the second section of the boom with a smaller cross-section is used for light loads, which is more reasonable.
[0008] Furthermore, the segmented control assembly also includes a second balancing valve and a hose reel, with the first balancing valve, the second balancing valve, and the switching valve mounted on the base arm. The hose reel is connected to the switching valve and the second balancing valve via hydraulic lines, and the second balancing valve is connected to the inlet and outlet oil chambers of the second set of telescopic cylinders via hydraulic lines.
[0009] In the above solution, adding a second balance valve allows for more precise control of the second set of telescopic cylinders, improving the accuracy and stability of the telescopic movement. The hose reel effectively organizes and protects the hydraulic lines, preventing damage due to friction or collision during boom extension and retraction, thus extending the service life of the hydraulic lines.
[0010] Furthermore, the boom has 10 sections. Sections 1-4 are designated as the first segment (group), and sections 5-10 as the second segment (group). The boom's extension and retraction are controlled independently for each segment (group). Correspondingly, the hydraulic cylinders for the first segment are in the first group, and those for the second segment are in the second group. By dividing the boom into two hydraulically controlled segments, precise control of the boom is achieved, enabling two-stage extension and retraction and allowing for more flexible adjustment of the boom's extension and retraction movements.
[0011] In the above scheme, the multi-way valve connects to the inlet and return oil chambers of the first set of telescopic cylinders via a first balance valve and hydraulic lines, controlling the extension and retraction of the first telescopic arm; the multi-way valve connects to the inlet and return oil chambers of the second set of telescopic cylinders via a switching valve, hose reel, second balance valve, and hydraulic lines, controlling the extension and retraction of the second telescopic arm. Specifically:
[0012] 1) Boom extension:
[0013] Operate the multi-way valve to allow hydraulic oil to flow to the rodless chamber (large chamber) of the first set of telescopic cylinders, pushing the first telescopic arm to extend;
[0014] When the second telescopic boom needs to be extended, operate the multi-way valve and switch the hydraulic oil from the winch action to the rodless chamber (large chamber) of the second telescopic cylinder through the switching valve. At the same time, the hose reel automatically releases the hose as the boom extends, and the second balance valve allows hydraulic oil to enter, pushing the second telescopic boom to extend.
[0015] 2) Boom retraction:
[0016] Operate the multi-way valve to allow hydraulic oil to enter the rod chamber (small chamber) of the first set of telescopic cylinders. The first balance valve opens, allowing the hydraulic oil in the rodless chamber (large chamber) to flow back, and the first telescopic arm retracts.
[0017] When the second telescopic boom needs to be retracted, operate the multi-way valve to switch the hydraulic oil from the winch action to the rod chamber (small chamber) of the second telescopic cylinder. The second balance valve opens, allowing the hydraulic oil in the rodless chamber (large chamber) to flow back, and the second telescopic boom retracts. The hose reel automatically retracts the hose, ensuring that the hydraulic pipeline is neat.
[0018] Furthermore, the switching valve is also connected to the winch via a hydraulic line, realizing integrated control of the extension and retraction of the second telescopic boom and the winch action. By sharing the switching valve, redundant components in the hydraulic system are reduced, the structure is simpler, and the cost is lowered.
[0019] Furthermore, it also includes length angle sensor A and length angle sensor B, which are used to monitor the length of the first telescopic boom and the total length of the boom, respectively. Both length angle sensor A and length angle sensor B are installed on the basic boom.
[0020] The length-angle sensor A has its pull rope end fixed to the last section of the first telescopic boom, enabling it to monitor the length of the first telescopic boom segment. The length-angle sensor B has its pull rope end fixed to the last section of the second telescopic boom, enabling it to monitor the total length of the boom.
[0021] Two length and angle sensors transmit the collected data to the force limit control system. The two length and angle sensors monitor the extension length of different control sections of the boom, and the force limit control system calculates the boom length information to perform torque limit protection, ensuring the force limit safety of irregular extension and contraction.
[0022] Furthermore, guide frame assembly A is provided on telescopic boom sections 1-4, and guide frame assembly B is provided on telescopic boom sections 5-10, which facilitates the storage and neat arrangement of hydraulic lines, length and angle sensor ropes.
[0023] Furthermore, the hose reel is connected to the base arm via a mounting bracket, which has a U-shaped folding plate and two side baffles forming a stable support platform for installing and fixing the hose reel.
[0024] The beneficial effects of this utility model are as follows:
[0025] 1. By adding a connecting pipeline, the telescopic boom is divided into two sections. The front and rear sections of the telescopic boom can be controlled independently. According to the actual lifting weight, the appropriate section can be selected for operation, thereby improving the ability to cope with various working conditions.
[0026] 2. Segmented control allows the boom to be adjusted independently at different angles and lengths. In light-load and short-distance working conditions, the smaller cross-section telescopic boom can be used first for operation, improving the flexibility of operation when dealing with complex environments such as narrow spaces and obstacles.
[0027] 3. The telescopic boom is controlled by a dual-circuit hydraulic system to increase the telescopic speed. When controlling the second telescopic boom, it is not necessary to go through the first stage, which can reduce pressure loss. At the same time, the appropriate flow rate is matched according to the cylinder diameter and rod diameter to ensure the stability of the telescopic speed. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the boom in its retracted state in this utility model;
[0029] Figure 2 This is a schematic diagram of the installation of the second balancing valve in this utility model;
[0030] Figure 3 for Figure 2 Enlarged view of section C;
[0031] Figure 4 for Figure 3 Enlarged view of section D;
[0032] Figure 5 This is a schematic diagram of the installation of the tube reel in this utility model;
[0033] Figure 6 This is a schematic diagram of the installation of the switching valve in this utility model;
[0034] Figure 7 This is a schematic diagram of the installation of the length angle sensor A in this utility model;
[0035] Figure 8 This is a schematic diagram of the installation of the length angle sensor B in this utility model;
[0036] Figure 9 This is a control block diagram of the present invention;
[0037] Figure 10 This is a schematic diagram of the oil circuit of the telescopic hydraulic cylinder of this utility model;
[0038] Figure 11 This is a schematic diagram showing the connection between the tube reel and the mounting bracket in this utility model;
[0039] Figure 12 This is a schematic diagram of the structure of the hose reel mounting bracket in this utility model;
[0040] In the diagram: 1. Pipe A, 2. Pipe B, 3. Second Balance Valve, 4. Pipe C, 5. Pipe D, 6. Diaphragm Joint Mounting Bracket, 7. Pipe Winder, 8. Pipe B1, 9. Pipe A1, 10. Switching Valve, 11. Long Angle Sensor A, 12. Guide Frame Assembly A, 13. Long Angle Sensor B, 14. Guide Frame Assembly B, 15. U-Shaped Baffle, 16. Side Baffle, 17. First Cylinder, 18. Second Cylinder, 19. Third Cylinder, 20. Fourth Cylinder, 21. Fifth Cylinder, 22. Sixth Cylinder, 23. Seventh Cylinder, 24. Eighth Cylinder, 25. Ninth Cylinder, 26. Tenth Cylinder, 27. First Balance Valve, 28. Winch. Detailed Implementation
[0041] A segmented telescopic boom includes a multi-way valve, 10 telescopic boom sections, 10 telescopic cylinders, and a segmented control assembly. Sections 1-4 of the telescopic boom are designated as the first segment, and sections 5-10 are designated as the second segment. Correspondingly, the telescopic cylinders for the first segment are designated as the first group, and the telescopic cylinders for the second segment are designated as the second group. The telescopic boom is hydraulically divided into two segments, and precise control of the telescopic boom is achieved through segmented control.
[0042] The segmented control assembly includes a first balancing valve, a second balancing valve 3, a switching valve 10, and a hose reel 7. The first balancing valve, the second balancing valve, the switching valve, and the hose reel are mounted on the basic arm. The first balancing valve and the switching valve are connected to a multi-way valve via hydraulic lines, and the hose reel is connected to the switching valve and the second balancing valve via hydraulic lines. Figure 9 As shown, the multi-way valve connects to the inlet and outlet oil chambers of the first set of telescopic cylinders through the first balance valve and hydraulic lines to control the extension and retraction of the first telescopic arm; the multi-way valve connects to the inlet and outlet oil chambers of the second set of telescopic cylinders through the switching valve, hose reel, second balance valve and hydraulic lines to control the extension and retraction of the second telescopic arm.
[0043] The switching valve is also connected to the winch via a hydraulic line. The multi-way valve controls the flow of hydraulic oil through the switching valve and the hydraulic line to achieve the winch action.
[0044] In one embodiment of this utility model, such as Figure 7 , Figure 8 As shown, it also includes length angle sensors A11 and B13, both mounted on the basic boom. The pull rope end of length angle sensor A is fixed to the 4th telescopic boom section, monitoring the length of the first telescopic boom section (sections 1-4); the pull rope end of length angle sensor B is fixed to the 10th telescopic boom section, monitoring the total length of the boom (sections 1-10). The two length angle sensors transmit the collected data to the force limit control system. After calculation by the force limit control system, the extension length of the telescopic boom sections 5-10 is determined, limiting the lifting performance and ensuring safety.
[0045] In one embodiment of this utility model, guide frame assemblies A 12 are respectively provided on telescopic arms sections 1-4, and guide frame assemblies B 14 are respectively provided on telescopic arms sections 5-10.
[0046] In one embodiment of this utility model, the hose reel is connected to the basic arm via a mounting bracket, such as... Figure 11 , Figure 12 As shown, the mounting bracket consists of a U-shaped folding plate 15 and two side baffles 16. The U-shaped folding plate 15 and the side baffles 16 together form a stable bearing platform for installing and fixing the hose reel.
[0047] In one embodiment of this utility model, the connection and control methods of the hydraulic lines between the 1-4 sections of the telescopic boom, the multi-way valve, and the first balance valve are the same as those of the boom without segmented control. An additional hydraulic line is added to the original boom, dividing the telescopic boom into two control sections, namely:
[0048] like Figure 5 , Figure 6 As shown, a new diaphragm joint (installed on the basic arm) is added. The diaphragm joint is connected to the multi-way valve through a hydraulic line. Oil pipes B1 8 and A1 9 connect the diaphragm joint to the switching valve 10. The switching valve 10 is connected to the hose reel 7 through an oil pipe, connecting the inlet and return oil to the hose reel.
[0049] like Figure 1 , Figure 4 , Figure 9 As shown, the hose reel 7 is connected to the corresponding interfaces A and B on the diaphragm joint mounting bracket 6 (installed on the 4th telescopic boom), which connects the control oil circuit and controls the movement of the 5th to 10th telescopic boom sections.
[0050] like Figure 2 , Figure 3 , Figure 4 As shown, oil pipe C4 connects the small chamber of the telescopic cylinder (corresponding to the fourth telescopic boom section) to the second balance valve 3; oil pipe D5 connects the large chamber of the telescopic cylinder (corresponding to the fourth telescopic boom section) to the second balance valve 3; oil pipes A1 and B2 connect the second balance valve 3 to the interface on the partition joint mounting bracket 6. Figure 4 Interface A connects to the large chamber of the telescopic cylinder, and interface B connects to the small chamber of the telescopic cylinder.
[0051] like Figure 9 As shown, the control system connects to the first-section telescopic boom cylinder via multi-way valve control link 1, controlling the movement of sections 1-4 of the telescopic boom. Multi-way valve control link 2, through a switching valve and components such as the hose reel, connects to the second-section telescopic boom cylinder, controlling the movement of sections 5-10 of the telescopic boom, thus achieving segmented control of the telescopic boom. Specifically:
[0052] like Figure 10As shown, sections 1-4 of the boom are each equipped with two telescopic cylinders: a pair of first cylinders 17, a pair of second cylinders 18, a pair of third cylinders 19, and a pair of fourth cylinders 20. Sections 5-10 of the boom are each equipped with one telescopic cylinder: a fifth cylinder 21, a sixth cylinder 22, a seventh cylinder 23, an eighth cylinder 24, a ninth cylinder 25, and a tenth cylinder 26.
[0053] The hydraulic oil controlled by the multi-way valve, after passing through the first balance valve, sequentially enters the large chambers of a pair of first cylinders 17, a pair of second cylinders 18, a pair of third cylinders 19, and a pair of fourth cylinders 20. Arm sections 1-4 extend sequentially, while the corresponding small chambers of these cylinders return oil. The hydraulic oil controlled by the multi-way valve, after passing through the switching valve and the second balance valve, sequentially enters the large chambers of the fifth cylinder 21, the sixth cylinder 22, the seventh cylinder 23, the eighth cylinder 24, the ninth cylinder 25, and the tenth cylinder 26. Arm sections 5-10 extend sequentially, while the corresponding small chambers of these cylinders return oil.
[0054] The hydraulic oil controlled by the multi-way valve, after passing through the first balance valve, sequentially enters the small chambers of a pair of first cylinders 17, a pair of second cylinders 18, a pair of third cylinders 19, and a pair of fourth cylinders 20. As the boom sections 1-4 retract, oil returns from the large chambers of the corresponding cylinders. The hydraulic oil controlled by the multi-way valve, after passing through the switching valve and the second balance valve, sequentially enters the small chambers of the fifth cylinder 21, the sixth cylinder 22, the seventh cylinder 23, the eighth cylinder 24, the ninth cylinder 25, and the tenth cylinder 26. As the boom sections 5-10 retract, oil returns from the large chambers of the corresponding cylinders.
[0055] The multi-way valve also controls the extension and retraction of the winch through a switching valve.
Claims
1. A telescoping jib with segmental control, characterized in that, It includes a multi-way valve, several telescopic arms, several telescopic cylinders, and segmented control components; the telescopic arms are divided into a first group and a second group in sequence, and similarly, the telescopic cylinders are divided into a first group and a second group accordingly; The segmented control component includes a first balancing valve and a switching valve. The first balancing valve and the switching valve are respectively connected to a multi-way valve through hydraulic lines. The first balancing valve is connected to the inlet and return oil chambers of the first set of telescopic cylinders through hydraulic lines, and the switching valve is connected to the inlet and return oil chambers of the second set of telescopic cylinders through hydraulic lines, forming a two-way control oil circuit.
2. The boom with segmented telescopic control according to claim 1, characterized in that, The segmented control assembly also includes a second balance valve and a hose reel. The hose reel is connected to the switching valve and the second balance valve via a hydraulic line, and the second balance valve is connected to the inlet and outlet oil chambers of the second set of telescopic cylinders via a hydraulic line.
3. A segmented telescopic boom according to claim 2, characterized in that, The switching valve is also connected to the winch via a hydraulic line.
4. A segmented telescopic boom according to claim 2, characterized in that, The first balancing valve, the second balancing valve, and the switching valve are mounted on the basic arm.
5. A segmented control telescopic boom according to any one of claims 1-3, characterized in that, It also includes length angle sensor A and length angle sensor B, which are used to monitor the length of the first telescopic boom and the total length of the boom, respectively. Both length angle sensor A and length angle sensor B are installed on the basic boom.
6. A segmented telescopic boom according to claim 5, characterized in that, The end of the pull rope of the length angle sensor A is fixed to the last section of the first telescopic arm, and the end of the pull rope of the length angle sensor B is fixed to the last section of the second telescopic arm.