Arm support type concrete spreader for secondary structure construction
By designing a multi-stage boom mechanism for the boom-type concrete placing boom, the problems of difficult positioning of the delivery pipe and the inability of small pump trucks to enter narrow areas were solved, achieving efficient, stable and precise control of concrete pouring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHENJIANG XINTIANHONG MASCH TECH CO LTD
- Filing Date
- 2026-02-11
- Publication Date
- 2026-05-19
AI Technical Summary
Existing inclined secondary structure pumps have problems such as difficulty in positioning the delivery pipe, high labor intensity, low efficiency and easy damage during concrete pouring, and small pump trucks cannot meet the construction needs in narrow areas.
A boom-type concrete placing boom was designed, which includes boom lifting and lowering, boom telescopic lifting, four-stage boom lifting and lowering and horizontal rotation mechanism. The boom is flexibly and precisely controlled by hydraulic and mechanical drive, and is equipped with a telescopic frame mechanism to fix the concrete delivery hose.
It achieves stable and precise positioning of the boom, reduces labor intensity, improves construction efficiency, reduces equipment wear, and is suitable for construction in narrow areas.
Smart Images
Figure CN122061597A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of construction machinery and equipment technology, and in particular to a boom-type concrete placing boom suitable for concrete pouring operations of secondary structures (such as structural columns, ring beams, and inverted supports) in high-rise buildings such as residential buildings and office buildings. It can achieve unmanned pipe carrying, rapid material placement, and safe and efficient construction. Background Technology
[0002] In building construction, especially when pouring concrete for secondary structures such as structural columns, lintels, and window sills, inclined secondary structural concrete pumps (commonly known as "secondary structural column pumps") are often used. This equipment is relatively small in size, making it easy to move within the building, and pumps concrete to the area to be poured via a connected flexible delivery pipe.
[0003] However, existing inclined secondary structure pumps have significant shortcomings in practical use: their delivery pipes are typically long and flexible hoses, lacking positioning and support mechanisms at the discharge port. When pouring concrete at higher locations or over horizontal distances that require crossing obstacles, operators must manually drag, lift, and secure the hose's discharge port. This process is not only labor-intensive and inefficient but also presents numerous problems. For example, positioning is difficult and unstable; manually holding the hose makes it difficult to accurately and stably align the discharge port with the formwork pouring opening, easily leading to concrete spillage, wasting materials, and polluting the work environment; it requires a large number of personnel, typically requiring at least one dedicated person to operate the hose discharge port, thus consuming manpower; and the hose's dragging and friction on the ground or structure easily causes abnormal wear, shortening its service life.
[0004] Currently, while large concrete pump trucks are equipped with flexible multi-section booms, enabling long-distance and precise concrete delivery, their bulky size and high cost make them inaccessible to indoor or confined secondary structure construction areas. Small secondary structure pumps also suffer from these shortcomings. Therefore, there is an urgent market need for a device that balances miniaturization, mobility, and convenient delivery and positioning to solve these technical problems. Summary of the Invention
[0005] In view of the defects existing in the prior art, the purpose of this invention is to provide a boom-type concrete placing boom for secondary structure construction, including equipment body (15) and boom assembly, characterized in that: the boom assembly is composed of a boom lifting and lowering mechanism, a boom telescopic lifting and lowering mechanism, and a four-stage boom lifting and lowering mechanism.
[0006] The aforementioned boom lifting and lowering mechanism includes a primary boom 11, a boom lifting cylinder 13, a lifting and lowering cylinder pin 12, a rotating pin 14, and a second lifting and lowering cylinder pin 16. The root of the primary boom 11 is hinged to the equipment vehicle body 15 through the rotating pin 14, allowing the primary boom 11 to rotate around the rotating pin 14. The piston rod end of the boom lifting cylinder 13 is hinged to the middle or front of the primary boom 11 through the lifting and lowering cylinder pin 12, and the bottom of the boom lifting cylinder 13 is hinged to the equipment vehicle body 15 through the second lifting and lowering cylinder pin 16.
[0007] The aforementioned boom telescopic lifting mechanism includes a secondary boom 24, a tertiary boom 23, a lifting cylinder 25, a lifting cylinder pin 26, a locking nut 21, and a plane bearing 22. The secondary boom 24 is connected to the primary boom 11, and the tertiary boom 23 is fitted inside the secondary boom 24, forming a sliding sleeve structure. The tertiary boom 23 can slide and extend stably along the axial direction of the secondary boom 24. The bottom of the cylinder of the lifting cylinder 25 is hinged to the primary boom 11 below through the lifting cylinder pin 26. The top of the piston rod of the lifting cylinder 25 passes through a pre-set plane hole on the tertiary boom 23 and is axially fixed by the locking nut 21. The plane bearing 22 is provided on both the upper and lower sides of the plane hole.
[0008] The aforementioned four-stage boom lifting mechanism consists of a four-stage boom 31, a drive unit 32, a transmission shaft 34, and a bushing 35. The four-stage boom 31 serves as the executing boom, and the drive unit 32 is fixedly installed on one end of the three-stage boom 23. The drive unit is a worm gear motor reducer 32, and the transmission shaft 34 is a hexagonal transmission shaft 34. The bushing 35 contains an inner hexagonal bushing 35. The output shaft of the worm gear motor reducer 32 is connected to a hexagonal transmission shaft 34. On one side of the root of the four-stage boom 31, an inner hexagonal bushing 35 is welded, the inner hole shape of which matches the hexagonal transmission shaft 34. The hexagonal transmission shaft 34 is inserted into the inner hexagonal bushing 35. The other side of the four-stage boom 31 is hinged to the three-stage boom 23 via a common pin, thus forming a rotating pair.
[0009] The boom-type concrete placing boom for secondary structure construction of the present invention further includes a boom horizontal rotation mechanism, which consists of a slewing component, a fixing component, and a pin-type locking device. The top of the primary boom 11 serves as the fixing component, and the boom telescopic lifting mechanism and the fourth-stage boom lifting mechanism serve as the slewing component. A circular sleeve structure is provided at the bottom of the secondary boom 24, and the circular sleeve structure is rotatably connected to the top journal of the primary boom 11 through two upper and lower needle roller bearings 45. The pin-type locking device has evenly distributed primary boom top teeth 46 machined on the top circumference of the primary boom 11. On both sides of the circular sleeve structure of the secondary boom 24, two sets of elastic pin assemblies composed of pin rods 43 and pin springs 44 are symmetrically arranged. Under the pretension of the pin springs 44, the ends of the pin rods 43 are embedded in the primary boom top teeth 46. The secondary boom 24 is also equipped with boom rotation handles 41 on both sides. The boom rotation handles 41 are hinged to the upper end of the pin rods 43 on the same side through connecting pieces 42.
[0010] The boom-type concrete placing boom of the present invention for secondary structure construction also includes a telescopic frame mechanism. The telescopic frame mechanism consists of a fixed base, a telescopic frame 54, and locking elements. The fourth-stage boom 31 serves as the fixed base, with multiple evenly distributed boom connection holes 52 machined along its length on both side walls. The telescopic frame 54, as a sliding component, has a U-shaped channel steel structure with its main body facing downwards, capable of wrapping around the square tube of the fourth-stage boom from top to bottom. Fixing screw holes are machined on both side walls of the telescopic frame 54 corresponding to the connection hole positions of the fourth-stage boom 31. Connecting screws 53 pass through the fixing screw holes of the telescopic frame 54 and the selected boom connection holes 52 on the fourth-stage boom 31, and are tightened with nuts, thus securely locking the telescopic frame 54 to any desired position on the fourth-stage boom 31. The fixing screw holes, connecting screws 53, boom connection holes 52, and nuts together constitute the locking elements. A hose fixing clamp 55 is installed at the top of the telescopic frame 54 for reliably fixing the concrete conveying hose.
[0011] Alternatively, a hose fixing clamp 55 may be installed at the top of the fourth-stage boom 31 to reliably secure the concrete delivery hose. Alternatively, a hose fixing clamp 55 may be installed at the top of the fourth-stage boom lifting mechanism to reliably secure the concrete delivery hose. Beneficial effects:
[0012] 1. The boom lifting and lowering mechanism of the boom-type concrete placing boom for secondary structure construction of the present invention is compact, powerfully driven, and easy to control. It can solve the problem that the end effector of small pumping equipment cannot achieve large-angle pitch adjustment, and provide a stable foundation support for subsequent telescopic and precise positioning functions.
[0013] 2. The boom telescopic lifting mechanism of the boom-type concrete placing boom for secondary structure construction of the present invention can further drive the boom to extend and retract linearly after the boom pitch angle is determined, thereby flexibly and accurately adjusting the final working height and radial distance to achieve precise coverage of pouring points at different heights.
[0014] 3. The four-stage boom lifting and lowering mechanism of the boom-type concrete placing boom of the present invention for secondary structure construction is compact, has high transmission efficiency, has self-locking function and precise positioning. This mechanism can drive the end boom to move in a wide range of angles and can be reliably locked at any position, thereby achieving precise and stable control of the discharge port direction.
[0015] 4. The boom horizontal rotation mechanism of the boom-type concrete placing boom of the present invention for secondary structure construction can realize manual operation and multi-position locking. This mechanism is used to adjust the horizontal angle of the entire upper boom and can achieve reliable mechanical locking at multiple angle positions.
[0016] 5. The telescopic frame mechanism of the boom-type concrete placing boom for secondary structure construction of the present invention is installed at the end of the fourth-level boom and can be manually adjusted and locked. This telescopic frame mechanism can realize the fine adjustment of the length of the boom end and provide rigid support after adjustment, thereby making up for the shortcomings of large telescopic mechanisms in micro-operation. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the boom lifting and lowering mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0018] Figure 2 This is a schematic diagram of the boom lifting and lowering mechanism of a boom-type concrete placing boom used in secondary structure construction (in a tilted state).
[0019] Figure 3 This is a 3D structural diagram of the boom lifting and lowering mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0020] Figure 1-3 In the middle, there are: first-stage boom 11, lifting cylinder pin 12, boom lifting cylinder 13, swivel pin 14, equipment body 15, and second lifting cylinder pin 16.
[0021] Figure 4 This is a schematic diagram of the boom telescopic lifting mechanism of a boom-type concrete placing boom used in secondary structure construction (extended state).
[0022] Figure 5 This is a partial schematic diagram of the boom telescopic lifting mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0023] Figure 6This is a schematic diagram of the boom telescopic lifting mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0024] Figure 4-6 In the middle, there are locking nuts 21, flat bearings 22, three-stage booms 23, two-stage booms 24, lifting cylinders 25, and lifting cylinder pins 26.
[0025] Figure 7 This is a schematic diagram of the four-stage boom lifting and lowering mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0026] Figure 8 This is a schematic diagram of a partial four-stage boom lifting and lowering mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0027] Figure 9 This is a schematic diagram of the hexagonal drive shaft structure of the four-stage boom lifting and lowering mechanism in Embodiment 3.
[0028] Figure 10 This is a schematic diagram of the inner hexagonal bushing structure of the four-stage boom lifting and lowering mechanism in Embodiment 3.
[0029] Figure 7-10 In the middle, there are four-stage boom 31, drive unit 32, three-stage boom 23, hexagonal drive shaft 34, and inner hexagonal bushing 35.
[0030] Figure 11 This is a schematic diagram of the horizontal rotation mechanism of the boom of a boom-type concrete placing boom used in secondary structure construction.
[0031] Figure 12 This is an exploded structural diagram of the boom horizontal rotation mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0032] Figure 11-12 The components include: boom rotating handle 41, connecting plate 42, pin rod 43, pin spring 44, needle roller bearing 45, and first-stage boom top tooth 46.
[0033] Figure 13 This is a schematic diagram of the horizontal rotation mechanism of the boom of a boom-type concrete placing boom used in secondary structure construction.
[0034] Figure 14 This is an exploded structural diagram of the boom horizontal rotation mechanism of a boom-type concrete placing boom used in secondary structure construction.
[0035] Figure 13-14 In the middle, there are four-stage boom 31, boom connection hole 52, connection screw 53, telescopic frame 54, and hose fixing clamp 55. Detailed Implementation
[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1
[0037] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment describes the boom lifting and lowering mechanism of a boom-type concrete placing boom for secondary structure construction. It mainly includes a primary boom 11, a boom lifting cylinder 13, a lifting and lowering cylinder pin 12, an equipment body 15, and a rotating pin 14. The primary boom 11 serves as the basic boom segment of the entire boom system. Its base is hinged to the equipment body 15 via the rotating pin 14, allowing the primary boom 11 to rotate around the rotating pin 14. The boom lifting cylinder 13 is the core driving component. Its piston rod end is hinged to the middle or front of the primary boom 11 via the lifting and lowering cylinder pin 12, while its cylinder bottom is hinged to the equipment body 15 via the second lifting and lowering cylinder pin 16. By controlling the extension and retraction of the boom lifting cylinder 13 through a hydraulic system, the primary boom 11 can be driven to lift or tilt around the rotating pin 14, achieving a pitch angle change of approximately 90 degrees.
[0038] Working principle: The hydraulic circuit is connected to the boom lifting cylinder 13. When the boom needs to be lifted, hydraulic oil enters the rodless chamber of the cylinder, pushing the piston rod out and thus lifting the first-stage boom 11. When the boom needs to be tilted, hydraulic oil enters the rod chamber of the cylinder, the piston rod retracts, and pulls the first-stage boom 11 downward. By precisely controlling the flow and pressure of the hydraulic oil, the boom can be smoothly and accurately stopped at the required angle. Joint bearings or bushings are installed at each hinge point to ensure flexible rotation and reduce wear.
[0039] The present invention achieves the following significant benefits through the simple combination of linkage and cylinder: (1) It greatly reduces labor intensity, eliminates the need for manual climbing and dragging of hoses, and has a high degree of automation and safe operation. (2) The basic movement is stable and reliable. The cylinder drive provides strong lifting and holding forces, ensuring that the first-stage boom and its load can be stably suspended at any angle, laying the foundation for precise material placement. (3) It has good expandability. This first-stage boom lifting and lowering mechanism provides a stable platform for the subsequent installation of multi-stage telescopic booms or slewing mechanisms, and is the basis for the entire boom system to achieve more complex functions. Example 2
[0040] like Figure 4 , Figure 5 , Figure 6As shown, this embodiment describes the boom telescopic lifting mechanism of a boom-type concrete placing boom for secondary structure construction. It mainly includes a secondary boom 24, a tertiary boom 23, a lifting cylinder 25, and related connecting and guiding components. The secondary boom 24 is connected to the primary boom 11, serving as the fixed guiding part of the telescopic mechanism. The tertiary boom 23 is fitted inside the secondary boom 24, forming a sliding sleeve structure to ensure that the tertiary boom 23 can stably slide and extend along the axial direction (length direction) of the secondary boom 24. The lifting cylinder 25 serves as the core driving element, with its cylinder bottom hinged to the lower primary boom 11 via a lifting cylinder pin 26. The piston rod of the lifting cylinder 25 passes through a pre-set planar hole on the tertiary boom 23 and is axially fixed by a locking nut 21, etc. Crucially, planar bearings 22 are installed on both the upper and lower sides of the planar hole. This design allows the boom system to have a certain degree of swing or torsional freedom in the horizontal plane while the cylinder rod bears the axial pushing and pulling force to drive the extension and retraction of the third-stage boom 23, thus preventing structural jamming. By controlling the extension and retraction of the lifting cylinder 25 through the hydraulic system, the third-stage boom 23 can be directly pushed or pulled to slide up and down within the second-stage boom 24, thereby smoothly changing the effective length of the entire boom.
[0041] Working Principle: In practical applications, this telescopic mechanism works in conjunction with the boom lifting and lowering mechanism of Embodiment 1. When the boom length needs to be increased (e.g., to feed material to a higher position), the hydraulic system is operated to allow pressurized oil to enter the rodless chamber of the lifting cylinder 25, pushing the piston rod out. The fixing device at the top of the piston rod transmits the thrust to the third-stage boom 23 via the flat bearing 22, driving it to extend upward from the second-stage boom 24. Conversely, when the boom needs to be retracted, pressurized oil enters the rod chamber of the cylinder, the piston rod retracts, and the pulling force causes the third-stage boom 23 to slide back into the second-stage boom 24. Throughout the process, the flat bearing 22 ensures that even with minor misalignment or boom deformation, the cylinder rod can move smoothly without being jammed. The locking nut 21 ensures a reliable connection between the cylinder rod and the third-stage boom 23.
[0042] The present invention has the following significant advantages: (1) It effectively expands the working range, significantly increases the working space coverage of the equipment, and makes it easier for the hose outlet to reach higher and farther pouring points. (2) It adopts a sleeve-type telescopic structure, which realizes the maximum stroke change within a limited installation space, and has high structural stability and good bending and torsional resistance. (3) The movement is smooth. The introduction of the plane bearing effectively solves the problem of motion interference between the oil cylinder and the boom, ensures the smoothness of the telescopic movement, and improves the adaptability of the mechanism to different working conditions. Example 3
[0043] like Figure 7-10As shown, this embodiment is a four-stage boom lifting mechanism for a boom-type concrete placing boom used in secondary structure construction. It mainly consists of a four-stage boom 31, a drive unit, a transmission shaft 34, and a specially designed bushing 35 connector. The four-stage boom 31 serves as the executing boom. The drive unit is a worm gear motor reducer 32, whose body is fixedly installed on one end of the three-stage boom 23. The output shaft of this worm gear motor reducer 32 is connected to a specially designed hexagonal transmission shaft 34. An inner hexagonal bushing 35 is welded to one side of the root of the four-stage boom 31, its inner hole shape matching the hexagonal transmission shaft 34. The hexagonal transmission shaft 34 is inserted into the inner hexagonal bushing 35, forming a sliding spline connection that effectively transmits torque while allowing slight axial movement under certain conditions. The other side of the four-stage boom 31 is hinged to the three-stage boom 23 via a common pin, thus forming a rotating pair.
[0044] Working principle: When the worm gear motor reducer 32 starts, its output torque is transmitted through the hexagonal drive shaft 34 to the inner hexagonal bushing 35 welded to the fourth-stage boom 31. Since the other side of the fourth-stage boom 31 is fixed by a pin, this torque is converted into a force that rotates the fourth-stage boom 31 around its pin hinge point, thereby achieving vertical lifting or lowering movements with a range of motion up to 180 degrees. When the movement stops, the inherent self-locking characteristic of the worm gear transmission mechanism 32 immediately takes effect, firmly locking the fourth-stage boom 31 at a specified angle and resisting reverse rotation caused by external forces.
[0045] The present invention brings the following significant benefits through the innovative design of "motor reducer + hexagonal transmission pair": (1) By utilizing the self-locking characteristics of worm gear transmission, the end arm can be reliably locked at any angle without the need for an additional braking device, and the positioning is accurate, which greatly improves the accuracy of fabric placement.
[0046] Simple and compact structure: (2) Compared with the hydraulic cylinder drive scheme, it eliminates the complex hydraulic pipelines and valve blocks, making the overall structure more compact and lightweight, which is very suitable for installation on the end boom where space is limited. (3) The hexagonal bushing connection method is simple to process, has a large contact area, and good transmission rigidity. Example 4
[0047] like Figure 11-12As shown, this embodiment describes the horizontal rotation mechanism of a boom-type concrete placing boom for secondary structure construction. It mainly consists of a rotating component, a fixed component, bearing supports, and a pin-type locking device. The top of the primary boom 11 serves as the fixed part. The secondary boom 24 and all its upper structures (including the tertiary boom 23 and the quaternary boom 31) serve as the rotating component. A circular sleeve structure is provided at the bottom of the secondary boom 24. This circular sleeve structure is rotatably connected to the top journal of the primary boom 11 via two upper and lower needle roller bearings 45, ensuring that the rotating component can rotate flexibly and smoothly around the vertical axis.
[0048] The locking mechanism is the core of the boom horizontal rotation mechanism in this embodiment: a series of evenly distributed toothed grooves (i.e., "first-stage boom top teeth 46") are machined on the top circumference of the first-stage boom 11. On both sides of the circular sleeve structure of the second-stage boom 24, two sets of elastic pin assemblies composed of pin rods 43 and pin springs 44 are symmetrically arranged. Under the pretension of the pin springs 44, the ends of the pin rods 43 can be inserted into the first-stage boom top teeth 46. Large boom rotation handles 41 are also installed on both sides of the second-stage boom 24. These large boom rotation handles 41 are hinged to the upper ends of the pin rods 43 on the same side via connecting pieces 42.
[0049] Working principle: Under the push of the pin spring 44, the lower end of the pin rod 43 is engaged in the top tooth 46 of the primary boom, using mechanical interference to prevent the boom from rotating and achieve a safe lock. When the orientation needs to be adjusted, the operator simultaneously presses down the boom rotation handles 41 on both sides. The boom rotation handles 41 overcome the tension of the pin spring 44 through the connecting piece 42, pulling the two pin rods 43 out of the top tooth 46 of the primary boom, thereby releasing the lock. At this time, the operator can push and pull the boom, allowing the rotating part to rotate freely around the fixed part by means of the needle roller bearing 45. When the target angle is reached (i.e., the position where the top tooth 46 of the primary boom is aligned), the boom rotation handles 41 are released, and the pin spring 44 immediately drives the pin rods 43 to pop out again, automatically engaging in the corresponding top tooth 46 of the primary boom, completing a new round of locking and positioning.
[0050] This embodiment achieves the following significant benefits through ingenious lever linkage and spring pin design: (1) The spring-driven pin engages with the toothed groove, providing a large locking force and good vibration resistance, effectively preventing accidental rotation of the boom during operation, thus ensuring high safety. (2) Multi-position precise positioning, with multiple positioning points evenly distributed on the circumference of the toothed groove, meeting the orientation requirements under most working conditions. (3) The lever principle design allows for easy unlocking by pressing down the handle, enabling the entire unlocking-rotation-locking process to be completed with one hand, resulting in good ergonomics. Example 5
[0051] like Figure 13-14As shown, this embodiment describes the telescopic frame mechanism of a boom-type concrete placing boom for secondary structure construction. It allows for manual extension and fine-tuning of the fourth-stage boom's end. It mainly consists of a fixed base, a telescopic frame, and locking elements. The fourth-stage boom 31 serves as the fixed base of this mechanism; its main body is a square tube structure, with multiple evenly distributed boom connection holes 52 machined along its length on both side walls. These holes constitute multiple preset adjustment positions. The telescopic frame 54, as a sliding component, is designed as a downward-opening U-shaped channel steel structure, capable of wrapping around the square tube of the fourth-stage boom from top to bottom. Fixing screw holes are also machined on both side walls of the telescopic frame 54 corresponding to the connection hole positions of the fourth-stage boom 31.
[0052] Working principle: By passing at least two sets of connecting screws 53 through the screw holes of the telescopic frame 54 and the selected boom connection holes 52 on the fourth-stage boom 31, and tightening them with nuts, the telescopic frame 54 can be securely locked at any desired position on the fourth-stage boom 31. At the top of the telescopic frame 54, a hose fixing clamp 55 is installed to reliably secure the concrete delivery hose.
[0053] The telescopic frame mechanism of this embodiment has the following significant advantages: (1) It provides a second-level fine-tuning function relative to the main telescopic mechanism, allowing operators to quickly and manually slide the telescopic frame to the appropriate position and lock it, thus achieving precise control. (2) It adopts a mechanical thread locking method, forming a rigid connection after locking, which can effectively resist the impact and vibration during concrete pumping and prevent position slippage. Multiple evenly distributed connection holes provide a wealth of length adjustment options, which can be flexibly selected according to different working conditions, making it highly adaptable. (3) As an end-mounted auxiliary device, this mechanism does not affect all the main functions of the boom, such as lifting, rotation, and main telescopic, and is a supplement and improvement to its functions.
[0054] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the invention. Any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention, and these modifications and modifications also fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims of this application.
Claims
1. A boom-type concrete placing boom for secondary structure construction, comprising a vehicle body (15) and a boom assembly, characterized in that: The boom assembly consists of a boom lifting and lowering mechanism, a boom telescopic lifting and lowering mechanism, and a four-stage boom lifting and lowering mechanism.
2. The boom-type concrete placing boom for secondary structure construction according to claim 1, characterized in that: The boom lifting and lowering mechanism includes a primary boom (11), a boom lifting cylinder (13), a lifting and lowering cylinder pin (12), a rotating pin (14), and a second lifting and lowering cylinder pin (16). The root of the primary boom (11) is hinged to the equipment vehicle body (15) through the rotating pin (14), so that the primary boom (11) can rotate around the rotating pin (14). The piston rod end of the boom lifting cylinder (13) is hinged to the middle or front of the primary boom (11) through the lifting and lowering cylinder pin (12), and the bottom of the boom lifting cylinder (13) is hinged to the equipment vehicle body (15) through the second lifting and lowering cylinder pin (16).
3. The boom-type concrete placing boom for secondary structure construction according to claim 2, characterized in that: The boom telescopic lifting mechanism includes a secondary boom (24), a tertiary boom (23), a lifting cylinder (25), a lifting cylinder pin (26), a locking nut (21), and a plane bearing (22). The secondary boom (24) is connected to the primary boom (11), and the tertiary boom (23) is fitted inside the secondary boom (24). The two form a sliding sleeve structure. The tertiary boom (23) can slide and extend stably along the axial direction of the secondary boom (24). The bottom of the cylinder of the lifting cylinder (25) is hinged to the primary boom (11) below through the lifting cylinder pin (26). The top of the piston rod of the lifting cylinder (25) passes through a pre-set plane hole on the tertiary boom (23) and is axially fixed by the locking nut (21). The plane bearing (22) is provided on both the upper and lower sides of the plane hole.
4. The boom-type concrete placing boom for secondary structure construction according to claim 3, characterized in that: The four-stage boom lifting mechanism consists of a four-stage boom (31), a drive unit (32), a transmission shaft (34), and a bushing (35). The four-stage boom (31) serves as the execution boom, and the drive unit (32) is fixedly installed on one side of the end of the three-stage boom (23).
5. The boom-type concrete placing boom for secondary structure construction according to claim 4, characterized in that: The drive unit is a worm gear motor reducer (32), the transmission shaft (34) is a hexagonal transmission shaft (34), the bushing (35) is an inner hexagonal bushing (35), the output shaft of the worm gear motor reducer (32) is connected to a hexagonal transmission shaft (34), on one side of the root of the fourth-stage boom (31), an inner hexagonal bushing (35) is welded, the inner hole shape of which matches the hexagonal transmission shaft (34), the hexagonal transmission shaft (34) is inserted into the inner hexagonal bushing (35), and the other side of the fourth-stage boom (31) is hinged to the third-stage boom (23) through a common pin, thus forming a rotating pair.
6. The boom-type concrete placing boom for secondary structure construction according to any one of claims 3 to 5, characterized in that: It also includes a boom horizontal rotation mechanism, which consists of a slewing component, a fixing component, and a pin-type locking device. The top of the first-stage boom (11) serves as the fixing component, and the boom telescopic lifting mechanism and the fourth-stage boom lifting mechanism serve as the slewing component. A circular sleeve structure is provided at the bottom of the second-stage boom (24). The circular sleeve structure is rotatably connected to the top journal of the first-stage boom (11) through two upper and lower needle roller bearings (45). The pin-type locking device is located at the top circular journal of the first-stage boom (11). On the upper part, there are evenly distributed teeth (46) on the top of the first-stage boom. On both sides of the circular sleeve structure of the second-stage boom (24), there are two sets of elastic pin assemblies composed of pin rods (43) and pin springs (44). Under the pretension of the pin springs (44), the ends of the pin rods (43) are embedded in the teeth (46) of the first-stage boom. The second-stage boom (24) is also equipped with boom rotating handles (41) on both sides. The boom rotating handles (41) are hinged to the upper end of the pin rods (43) on the same side through connecting pieces (42).
7. The boom-type concrete placing boom for secondary structure construction according to any one of claims 3 to 5, characterized in that: It also includes a telescopic frame mechanism, which consists of a fixed base, a telescopic frame (54) and a locking element. The fourth-level boom (31) serves as a fixed base, and multiple evenly distributed boom connection holes (52) are machined on its two side walls along the length direction. The telescopic frame (54) serves as a sliding component, and its main body is a U-shaped channel steel structure with an opening facing downwards, which can cover the outside of the square tube of the fourth-level boom from top to bottom. The two side walls of the telescopic frame (54) are machined with fixing screw holes corresponding to the connection hole positions of the fourth-level boom (31). The connecting screw (53) passes through the fixing screw hole of the telescopic frame (54) and the selected boom connection hole (52) on the fourth-level boom (31), and is fastened with a nut, so that the telescopic frame (54) can be firmly locked at any desired position on the fourth-level boom (31). The fixing screw hole, the connecting screw (53), the boom connection hole (52) and the nut together constitute the locking element.
8. The boom-type concrete placing boom for secondary structure construction according to claim 7, characterized in that: At the top of the telescopic frame (54), a hose fixing clamp (55) is installed to reliably secure the concrete delivery hose.
9. The boom-type concrete placing boom for secondary structure construction according to claim 4, characterized in that: At the top of the fourth-stage boom (31), a hose fixing clamp (55) is installed to reliably secure the concrete delivery hose.
10. The boom-type concrete placing boom for secondary structure construction according to claim 1, characterized in that: At the top of the fourth-stage boom lifting mechanism, a hose fixing clamp (55) is installed to reliably secure the concrete delivery hose.