Road engineering bored pile hole cleaning device
By designing a device for drilling pile holes, the lifting rod, surrounding driving mechanism, elastic telescopic crossbar assembly and adjustment and collection mechanism are used to solve the problem of irregular protrusions in the inner wall of the hole caused by mechanical vibration during the hole cleaning process, and an efficient and stable hole cleaning effect is achieved.
Patent Information
- Application Number
- CN202510130355.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-05-06
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When cleaning the wet and soft foundations with a hole cleaning device, mechanical vibration can easily cause the hole cleaning device to interact with the inner wall of the hole, causing irregular protrusions of the inner wall of the hole, affecting the forming strength of the cast pile.
A road engineering drilling pile hole cleaning device is designed, including a lifting rod, a surround drive mechanism, an elastic telescopic crossbar assembly, a cleaning scraper and an adjustment and collection mechanism. By cooperating around the drive mechanism and the lifting rod, the movement of the cleaning scraper is accurately controlled; the elastic telescopic crossbar assembly can achieve flexible adjustment to avoid excessive friction; the adjustment of the collection mechanism ensures effective collection of impurities.
The device can accurately control the movement of the cleaning scraper, ensure full coverage of the inner wall of the drill hole, and improve hole cleaning efficiency; the design of the elastic telescopic crossbar assembly avoids excessive friction and protects the hole wall; the design of the adjustment collection mechanism ensures effective collection of impurities and improves overall working efficiency.
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Figure CN119933596A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of safety engineering, and in particular to a bored pile hole cleaning device for road engineering. Background Art
[0002] Bored cast-in-place piles refer to piles formed by forming holes in the foundation through various methods and pouring concrete inside during engineering construction. When rough drilling is carried out, there will be foundation residues at the bottom of the hole that have not been discharged in time. It is necessary to use a slag cleaning device to clean the foundation residues at the bottom of the hole to ensure that the cast-in-place piles after the concrete is injected can obtain the required length and shape. However, when using the slag cleaning device to clean the relatively moist and soft foundation, since the foundation is relatively moist and soft, if the head of the slag cleaning device that is extended for extraction generates mechanical vibration during operation, it is easy to cause the extended part of the slag cleaning device to interact with the inner wall of the hole to produce irregular protrusions on the inner wall of the hole, which in turn causes the poured cement to have irregular diameters due to the presence of protrusions, affecting the strength of the cast-in-place pile after formation. Summary of the invention
[0003] In order to overcome the above-mentioned existing shortcomings, the main purpose of the present invention is to provide a bored pile hole cleaning device for road engineering.
[0004] To achieve the above object, the present invention adopts the following technical scheme, a road engineering bored pile hole cleaning device, comprising:
[0005] A lifting rod, the upper end of which is fixedly connected to a fixing frame arranged on the ground surface;
[0006] An adjusting and collecting mechanism is arranged at the lower end of the lifting rod;
[0007] A surrounding driving mechanism is arranged on the lifting rod;
[0008] An elastic telescopic crossbar assembly is horizontally arranged, and one end of the elastic telescopic crossbar assembly is vertically fixedly connected to the surrounding driving mechanism;
[0009] A cleaning scraper is vertically arranged, one end of which is vertically fixedly connected to the elastic telescopic cross bar assembly and contacts the hole wall;
[0010] A longitudinal sliding compression assembly is fixedly mounted on the bottom of the surrounding driving mechanism;
[0011] A connecting rod, one end of which is connected to the longitudinal sliding compression assembly, and the other end of which is hinged to the lower end of the cleaning scraper;
[0012] The support rod has one end hinged to the elastic telescopic cross bar assembly and the other end slidably connected to the connecting rod.
[0013] The elastic telescopic cross bar assembly comprises:
[0014] A pipe sleeve, vertically and fixedly connected to the surrounding driving mechanism;
[0015] A moving block is arranged in the pipe sleeve, slidably connected with the pipe sleeve, and has magnetism;
[0016] A soft magnetic body is arranged at the bottom of the tube sleeve and is electrically connected to a power source;
[0017] A sleeve rod, one end of which is vertically fixedly connected to the side wall of the moving block, and the other end of which is vertically fixedly connected to the cleaning scraper;
[0018] The first elastic extrusion piece is arranged in the pipe sleeve, one end of which is fixedly connected to the bottom of the pipe sleeve, and the other end of which is fixedly connected to the connection block, and has no magnetism.
[0019] The surround drive mechanism comprises:
[0020] The driving block is fixed on the lifting rod and has an annular groove at the bottom;
[0021] A plurality of forward and reverse motors are evenly arranged at the bottom of the annular groove;
[0022] A plurality of first gears are respectively connected to the plurality of forward and reverse motors through motor shaft transmission, and are in the annular groove;
[0023] A driving ring is sleeved on the driving block, and its outer side wall is vertically fixedly connected to the pipe sleeve;
[0024] The inner gear ring is fixed on the inner wall of the driving ring and meshes with the first gears.
[0025] The longitudinal sliding compression assembly comprises:
[0026] A connecting block is fixedly mounted on the bottom of the surrounding driving mechanism; a sliding groove is longitudinally provided on the side wall of the connecting block;
[0027] A slider, slidably disposed in the slide groove and hinged to one end of the connecting rod;
[0028] Two second elastic extrusion members are arranged in the slide groove and are respectively located on both sides of the slide block, and are both fixedly connected to the slide block.
[0029] The regulating and collecting mechanism comprises:
[0030] A plurality of fan-shaped plates are evenly arranged around the lifting rod, and the inner arc ends of the fan-shaped plates are hinged to the lower end of the lifting rod;
[0031] A plurality of fan-shaped flexible folding members are respectively arranged between adjacent fan-shaped plates, and two straight sides of each of the fan-shaped flexible folding members are fixedly connected to the fan-shaped plates on both sides;
[0032] A sliding telescopic arc rod assembly is fixedly arranged on one side of the outer arc of each sector plate and is fixedly connected to the outer arc side wall of each sector flexible folding member;
[0033] A retracting assembly, slidably disposed at the lower end of the lifting rod;
[0034] A plurality of supporting rods have one end connected to the contraction assembly and the other end hinged to the fan-shaped plates respectively.
[0035] The shrinking assembly comprises:
[0036] An adjusting block is slidably sleeved on the lifting rod;
[0037] The lifting rod is provided with a vertical accommodating slot;
[0038] A rack, arranged in the vertical receiving groove;
[0039] A rotary drive member, fixedly mounted on the top of the adjusting block;
[0040] The driving gear is fixedly connected to the rotating drive and meshes with the rack.
[0041] The sliding telescopic arc rod assembly:
[0042] An arc-shaped slide rail is arranged on one side of the outer arc of each sector plate;
[0043] An arc-shaped rod, having the same curvature radius as the arc-shaped slide rail, one end of which is slidably connected to the arc-shaped slide rail, and the other end of which is connected to an adjacent sector plate of the fixed slide rail;
[0044] The third elastic extrusion member is arranged in the arc-shaped slide rail, and two ends of the third elastic extrusion member are respectively connected to the side wall of the arc-shaped slide rail and the arc-shaped rod.
[0045] The elastic telescopic cross bar assembly is provided with a plurality of groups, and the arc-shaped rods of the elastic telescopic cross bar assembly arranged at intervals are vertically fixedly connected with the roller.
[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can accurately control the longitudinal and circumferential horizontal movement of the cleaning scraper through the cooperation of the surrounding drive mechanism and the lifting rod, ensuring the comprehensive coverage of the inner wall of the borehole during the cleaning process, thereby improving the hole cleaning efficiency. Among them, the design of the elastic telescopic crossbar assembly can achieve flexible adjustment, so that the contact force between the cleaning scraper and the hole wall can be accurately adjusted to avoid excessive friction and damage to the hole wall, while ensuring the effective removal of the uneven parts on the side wall of the hole. The design of the pipe sleeve, the moving block and the soft magnet can adjust the telescopic length of the cleaning scraper as needed to adapt to the hole shape of different depths and widths, ensuring the cleaning effect. And the adjustment collection mechanism for collecting the processed objects, wherein the cooperation design of multiple fan-shaped plates, flexible folding parts and sliding telescopic arc rod assemblies can ensure that the debris and impurities cleaned in the hole are directly collected after being processed from the side wall during the hole cleaning process. And through the design of the adjustment block, the rack and the rotating drive member, the shape of the collection mechanism can be flexibly adjusted to facilitate the adaptation to boreholes of different sizes and shapes, and ensure stability and ease of operation. The multiple elastic extrusion parts, connecting rods, supporting rods and other components in the design of the present invention enhance the stability of the device and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.
[0048] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;
[0049] Figure 2 It is a schematic diagram of the top view of the structure of the elastic telescopic cross bar assembly of the present invention;
[0050] Figure 3 is a cross-sectional schematic diagram of the annular drive mechanism of the present invention;
[0051] Figure 4 is a cross-sectional schematic diagram of a longitudinal sliding compression assembly of the present invention;
[0052] Figure 5 It is a schematic diagram of the top view of the regulating and collecting mechanism of the present invention;
[0053] Figure 6 It is a structural schematic diagram of the sliding telescopic arc rod assembly of the present invention. DETAILED DESCRIPTION
[0054] A bored pile hole cleaning device for road engineering, comprising a lifting rod 1, the upper end of which is fixedly connected to a fixed frame arranged on the ground surface; an adjusting and collecting mechanism, which is arranged at the lower end of the lifting rod 1; a surrounding drive mechanism 2, which is arranged on the lifting rod 1; an elastic telescopic cross bar assembly 3, which is horizontally arranged, and one end of which is vertically fixedly connected to the surrounding drive mechanism 2; a cleaning scraper 4, which is vertically arranged, and one end of which is vertically fixedly connected to the elastic telescopic cross bar assembly 3 and contacts with the hole wall; a longitudinal sliding compression assembly, which is fixedly arranged at the bottom of the surrounding drive mechanism 2; a connecting rod 6, one end of which is connected to the longitudinal sliding compression assembly, and the other end is hinged to the lower end of the cleaning scraper 4; a support rod 7, one end of which is hinged to the elastic telescopic cross bar assembly 3, and the other end is slidably connected to the connecting rod 6.
[0055] The elastic telescopic cross bar assembly 3 includes: a pipe sleeve 3-1, which is vertically fixedly connected to the surrounding drive mechanism 2; a moving block 3-2, which is arranged in the pipe sleeve 3-1, slidably connected to the pipe sleeve 3-1, and has magnetism; a soft magnet, which is arranged at the bottom of the pipe sleeve 3-1; and is electrically connected to the power point; a sleeve rod 3-3, one end of which is vertically fixedly connected to the side wall of the moving block 3-2, and the other end of which is vertically fixedly connected to the cleaning scraper 4; a first elastic extrusion piece 3-4, which is arranged in the pipe sleeve 3-1, one end of which is fixedly connected to the bottom of the pipe sleeve 3-1, and the other end of which is fixedly connected to the connecting block 5, and has no magnetism.
[0056] The surrounding drive mechanism 2 includes: a drive block 2-1, which is fixed on the lifting rod 1; a ring groove is opened at the bottom; multiple forward and reverse motors 2-3 are evenly arranged at the bottom of the ring groove; multiple first gears 2-2 are respectively connected to the multiple forward and reverse motors 2-3 through motor shaft transmission, and are in the ring groove; a drive ring, which is sleeved on the drive block 2-1, and its outer wall is vertically fixedly connected to the pipe sleeve 3-1; an inner gear ring, which is fixed on the inner wall of the drive ring, and is meshed with multiple first gears 2-2.
[0057] The longitudinal sliding compression assembly includes: a connecting block 5, which is fixed at the bottom of the surrounding driving mechanism 2; a sliding groove is longitudinally opened on its side wall; a sliding block 5-2, which is slidably arranged in the sliding groove and is hinged to one end of the connecting rod 6; two second elastic extrusion members 5-1, which are arranged in the sliding groove and are respectively located on both sides of the sliding block 5-2, and are both fixedly connected to the sliding block 5-2.
[0058] The regulating and collecting mechanism includes: a plurality of fan-shaped plates 7-3, which are evenly arranged around the lifting rod 1, and the inner arc ends thereof are hinged to the lower end of the lifting rod 1; a plurality of fan-shaped flexible folding members 8, which are respectively arranged between adjacent fan-shaped plates 7-3, and the two straight sides of each of the fan-shaped flexible folding members are fixedly connected to the fan-shaped plates 7-3 on both sides; a sliding telescopic arc rod assembly, which is fixedly arranged on one side of the outer arc of each fan-shaped plate 7-3, and is fixedly connected to the outer arc side wall of each fan-shaped flexible folding member; a contraction assembly, which is slidably arranged at the lower end of the lifting rod 1; a plurality of support rods 7-2, one end of which is connected to the contraction assembly, and the other end is respectively hinged to the fan plates 7-3.
[0059] The retraction assembly includes: an adjustment block, which is slidably sleeved on the lifting rod 1; a vertical accommodating groove is opened on the lifting rod 1; a rack is arranged in the vertical accommodating groove; a rotating driving member is fixedly arranged on the top of the adjustment block; and a driving gear is fixedly connected to the rotating driving member and meshed with the rack.
[0060] The sliding telescopic arc rod assembly includes: an arc-shaped slide rail, which is arranged on one side of the outer arc of each sector plate; an arc rod 10, which has the same curvature radius as the arc-shaped slide rail, one end of which is slidably connected to the arc-shaped slide rail, and the other end is connected to the adjacent sector plate 7-3 of the fixed sliding rail; a third elastic extrusion member 11, which is arranged in the arc-shaped slide rail, and its two ends are respectively connected to the side wall of the arc-shaped slide rail and the arc rod 10.
[0061] The elastic telescopic cross bar assembly 3 is provided with a plurality of groups, and the arc-shaped rods of the elastic telescopic cross bar assembly 3 arranged at intervals are vertically fixedly connected to the roller.
[0062] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.
[0063] Example:
[0064] The lifting rod 1 is fixedly connected to a fixing frame 2 disposed on the ground through its upper end, forming the basic frame of the device. The fixing frame 2 is usually made of steel structure or concrete to ensure its stability. During the operation, the lifting rod 1 will rise and fall to meet the needs of cleaning holes of different depths.
[0065] The regulating collection mechanism is arranged at the lower end of the lifting rod 1, and its main function is to collect the mud and sand and other debris generated during the hole cleaning process. The mechanism is composed of a plurality of fan-shaped plates evenly arranged around the lifting rod, and the inner arc end of the fan-shaped plate is connected to the lower end of the lifting rod by a hinge. A fan-shaped flexible folding piece is arranged between every two adjacent fan-shaped plates, and these folding pieces provide the necessary flexibility to ensure that the collection mechanism can adapt to different hole diameter shapes.
[0066] A sliding telescopic arc rod assembly is provided on the outer arc side of each sector plate. The connection between the arc slide rail and the arc rod allows the arc rod assembly to freely extend and retract during the hole cleaning process to adjust the opening and closing degree of the collection mechanism. The third elastic extrusion piece ensures that the arc rod always maintains balance when extending and retracting and provides appropriate tension.
[0067] The cleaning scraper 4 is vertically arranged, located below the lifting rod, and contacts the hole wall to ensure that the debris on the hole wall can be effectively removed. The cleaning scraper is connected to the elastic telescopic cross bar assembly 3, which is horizontally arranged and adjusts the position of the cleaning scraper by elastic telescopic means. The elastic telescopic cross bar assembly includes components such as a pipe sleeve, a moving block, and a soft magnet. The soft magnet is connected to the circuit through a power point to provide the necessary magnetic force to stabilize the assembly when needed. That is, when the hole cleaning operation is not performed, the power is turned on. Due to the magnetic effect, the sleeve rod is close to the bottom of the sleeve, and the first elastic extrusion member is squeezed at this time.
[0068] The longitudinal sliding compression component is arranged at the bottom of the surrounding driving mechanism and is slidably connected to the slider and the connecting rod. The function of this component is to provide longitudinal driving force when cleaning the hole to ensure that the cleaning scraper can effectively clean the hole wall. The second elastic extrusion member is arranged in the slide groove to ensure the smooth movement of the slider.
[0069] The surrounding drive mechanism is located on the lifting rod 1 and is responsible for providing power for the hole cleaning device to clean the side wall. The mechanism drives the hole cleaning device to operate efficiently through the linkage with the elastic telescopic cross bar assembly, the cleaning scraper and the longitudinal sliding compression assembly.
[0070] The contraction assembly includes an adjustment block, a rack and a rotary drive member, and the contraction degree of the contraction assembly is controlled by providing power through the rotary drive member. The rack is matched with the receiving vertical slot on the lifting rod, and the adjustment block is connected to the lifting rod by sliding.
[0071] When the hole cleaning device is started, the lifting rod starts to move up and down through the support of the fixed frame. The regulating and collecting mechanism at the lower end of the lifting rod is unfolded, and the cleaning scraper is pushed toward the hole wall under the action of the elastic telescopic cross bar assembly.
[0072] The surrounding drive mechanism is started to drive the elastic telescopic crossbar assembly and the cleaning scraper to perform cleaning operations in the hole wall. The longitudinal sliding compression assembly cooperates with the movement of the cleaning scraper to provide the necessary longitudinal force.
[0073] At the same time, the collected debris is collected centrally by a collecting mechanism composed of a fan-shaped plate and a flexible folding member, and finally the cleaned debris is taken out by a contraction component.
[0074] The hole cleaning device reaches the position of the bored pile, and the fixed frame and lifting rod remain stable. The collection mechanism is adjusted to expand and prepare to collect the debris generated during the hole cleaning process. The surrounding drive mechanism is activated, pushing the cleaning scraper to contact the hole wall and clean the hole wall. The cleaning scraper adjusts the angle or position through the elastic telescopic crossbar assembly to adapt to different hole diameters. The longitudinal sliding compression assembly cooperates with the pressure generated by the cleaning scraper to perform longitudinal cleaning in the hole. The collected debris is finally discharged through the collection mechanism.
[0075] The present invention realizes the efficient cleaning function of the bored pile hole cleaning device. Through the precise linkage design of each component, it can maintain good working stability and adaptability in a complex construction environment. Through the comprehensive application of multiple technical means such as elastic expansion, magnetic adjustment, longitudinal sliding, etc., the hole cleaning device has high operating efficiency and good adaptability in practical applications.
[0076] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0077] The above embodiments are merely examples of the present invention and do not limit the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.
Claims
1. A boring pile hole cleaning device for road engineering, characterized in that: include: A lifting rod (1), the upper end of which is fixedly connected to a fixing frame arranged on the ground surface; An adjusting and collecting mechanism is arranged at the lower end of the lifting rod (1); A surrounding driving mechanism (2) is arranged on the lifting rod (1); An elastic telescopic crossbar assembly (3) is arranged horizontally, and one end of the elastic telescopic crossbar assembly (3) is vertically fixedly connected to the surrounding driving mechanism (2); A cleaning scraper (4) is arranged vertically, one end of which is vertically fixedly connected to the elastic telescopic cross bar assembly (3) and contacts the hole wall; A longitudinal sliding compression assembly is fixedly arranged at the bottom of the surrounding driving mechanism (2); A connecting rod (6), one end of which is connected to the longitudinal sliding compression assembly, and the other end of which is hinged to the lower end of the cleaning scraper (4); A support rod (7) has one end hinged to the elastic telescopic cross rod assembly (3) and the other end slidably connected to the connecting rod (6).
2. The road engineering bored pile hole cleaning device as claimed in claim 1, characterized in that: The elastic telescopic crossbar assembly (3) comprises: A pipe sleeve (3-1) vertically and fixedly connected to the surrounding driving mechanism (2); A moving block (3-2) is disposed in the pipe sleeve (3-1) and is slidably connected to the pipe sleeve (3-1), and is specifically magnetic; A soft magnetic body is arranged at the bottom of the pipe sleeve (3-1) and is electrically connected to a power source; A sleeve rod (3-3), one end of which is vertically fixedly connected to the side wall of the moving block (3-2), and the other end of which is vertically fixedly connected to the cleaning scraper (4); The first elastic extrusion piece (3-4) is arranged in the pipe sleeve (3-1), has one end fixedly connected to the bottom of the pipe sleeve (3-1), and the other end fixedly connected to the connection block (5), and has no magnetism.
3. The road engineering bored pile hole cleaning device as claimed in claim 2, characterized in that: The surrounding driving mechanism (2) comprises: The driving block (2-1) is fixedly mounted on the lifting rod (1); an annular groove is formed at the bottom of the driving block; A plurality of forward and reverse motors (2-3) are evenly arranged at the bottom of the annular groove; A plurality of first gears (2-2) are respectively connected to the plurality of forward and reverse motors (2-3) via motor shaft transmission, and are located in the annular groove; A driving ring, sleeved on the driving block (2-1), with its outer side wall vertically and fixedly connected to the pipe sleeve (3-1); The inner gear ring is fixed on the inner wall of the driving ring and meshes with the plurality of first gears (2-2).
4. The road engineering bored pile hole cleaning device as claimed in claim 1, characterized in that: The longitudinal sliding compression assembly comprises: A connecting block (5) is fixedly mounted on the bottom of the surrounding driving mechanism (2); a sliding groove is longitudinally provided on the side wall thereof; A slider (5-2) is slidably disposed in the slide groove and is hinged to one end of the connecting rod (6); Two second elastic extrusion members (5-1) are arranged in the slide groove and are respectively located on both sides of the slide block (5-2), and are both fixedly connected to the slide block (5-2).
5. The road engineering bored pile hole cleaning device as claimed in claim 1, characterized in that: The regulating and collecting mechanism comprises: A plurality of fan-shaped plates (7-3) are evenly arranged around the lifting rod (1), and the inner arc ends of the fan-shaped plates are hinged to the lower end of the lifting rod (1); A plurality of fan-shaped flexible folding members (8) are respectively arranged between adjacent fan-shaped plates (7-3), and two straight sides of each of the fan-shaped flexible folding members are fixedly connected to the fan-shaped plates (7-3) on both sides; A sliding telescopic arc rod assembly is fixedly arranged on one side of the outer arc of each sector plate (7-3) and is fixedly connected to the outer arc side wall of each sector flexible folding member; A retracting assembly, slidably disposed at the lower end of the lifting rod (1); A plurality of support rods (7-2) have one end connected to the contraction assembly and the other end hinged to the sector plates (7-3) respectively.
6. The road engineering bored pile hole cleaning device as claimed in claim 5, characterized in that: The shrinking assembly comprises: An adjusting block, slidably sleeved on the lifting rod (1); The lifting rod (1) is provided with a vertical accommodating groove; A rack, arranged in the vertical receiving groove; A rotary driving member, fixedly mounted on the top of the adjusting block; A driving gear is fixedly connected to the rotating driving member and meshes with the rack.
7. The road engineering bored pile hole cleaning device as claimed in claim 5, characterized in that: The sliding telescopic arc rod assembly comprises: An arc-shaped slide rail is arranged on one side of the outer arc of each sector plate; An arc-shaped rod (10) having the same curvature radius as the arc-shaped slide rail, one end of which is slidably connected to the arc-shaped slide rail, and the other end of which is connected to an adjacent sector plate (7-3) of the fixed slide rail; The third elastic extrusion member (11) is arranged in the arc-shaped slide rail, and its two ends are respectively connected to the side wall of the arc-shaped slide rail and the arc-shaped rod (10).
8. The road engineering bored pile hole cleaning device as claimed in claim 1, characterized in that: The elastic telescopic cross bar assembly (3) is provided with a plurality of groups, and the arc-shaped rods of the elastic telescopic cross bar assembly (3) arranged at intervals are vertically fixedly connected to the roller.
Citation Information
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