Guide structure for extending the main boom of crawler cranes

Abstract

This utility model discloses a guide structure for extending the main boom of a crawler crane, including a telescopic main boom and three guide sleeves. Four fixing blocks are provided on the outer sides of each of the three guide sleeves. A supporting horizontal plate is slidably connected to the inner wall of each fixing block. A movable plate is provided on the supporting horizontal plate, and a through hole is formed in the supporting horizontal plate. The movable plate is slidably connected to the inner wall of the corresponding through hole. A clearance notch is formed at the bottom of the movable plate, and a roller is rotatably connected to the inner wall of the clearance notch. The roller is slidably connected to the side wall of the corresponding section of the telescopic main boom. By observing the shape of the scratch marks on the colored wax plate, the distance the movable plate moves towards the telescopic main boom can be detected, thus indirectly reflecting the structural deformation caused by the concavity of the outer wall of the telescopic main boom. This allows for timely detection of concavity problems caused by load on the telescopic main boom, preventing the accumulation of concavity from damaging the structural integrity of the main boom.

Description

Technical Field

[0001] This utility model relates to the field of crane main boom technology, specifically a guide structure for extending the main boom of a crawler crane. Background Technology

[0002] Tracked cranes, as core heavy equipment in modern engineering, are widely used in construction, bridges, and other fields due to their strong load-bearing capacity and flexible operation. Their operating range and lifting performance depend on the boom structure. The boom moves loads by swinging and extends the operating radius through segmented telescopic extension to meet the needs of large-scale operations. The stability of the boom's telescopic extension is ensured by the segment ends and internal guide structure. Existing guide structures include components such as the inner wall rail of the mother segment, the slider at the end of the daughter segment, rollers, locating pin holes, and flanges. These components limit lateral offset to ensure smooth movement of the segment along the axis while distributing bending stress under radial loads. However, in actual use, the boom is prone to localized dents and deformations on its outer wall due to the lifting load, its own weight, and impact loads. When lifting heavy objects, especially when the boom is extended to its maximum extent or when lifting eccentric loads, stress concentration on the outer wall of the segment joint area causes plastic dents, compromising structural integrity, reducing load-bearing capacity, and even leading to potential cracks. These dents also alter the fit accuracy of the guide structure, causing track misalignment, abnormal clearance between the slider and track, resulting in telescopic jamming, abnormal noises, and component wear, thus shortening service life.

[0003] Therefore, this utility model provides a guide structure for extending the main boom of a crawler crane. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a guide structure for extending the main boom of a crawler crane, thereby solving the aforementioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a guide structure for extending the main boom of a crawler crane, comprising a telescopic main boom and three guide sleeves. Four fixing blocks are provided on the outer sides of each of the three guide sleeves. A supporting horizontal plate is slidably connected to the inner wall of each fixing block. A movable plate is provided on the supporting horizontal plate, and a through hole is formed in the supporting horizontal plate. The movable plate is slidably connected to the inner wall of the corresponding through hole. A clearance notch is formed at the bottom of the movable plate, and a roller is rotatably connected to the inner wall of the clearance notch. The roller is slidably connected to the side wall of the corresponding boom segment of the telescopic main boom. A colored wax plate is provided on one side of each movable plate, and the colored wax plate contacts the inner wall of the through hole.

[0006] Preferably, a fixing plate is installed on the inner wall of the through hole, and a central hole is opened on the movable plate, with the fixing plate slidably connected to the inner wall of the central hole.

[0007] Preferably, a compression spring is installed on the inner wall of the central hole, and the top end of the compression spring contacts the bottom of the fixing plate.

[0008] Preferably, a guide rod is installed in the central hole, and the compression spring is sleeved on the outer side of the corresponding guide rod, with the guide rod passing through the top of the fixing plate.

[0009] Preferably, an infrared rangefinder is embedded in the top side of the central hole, and the infrared rangefinder is positioned above the corresponding fixing plate.

[0010] Preferably, a screw is rotatably connected to the inner wall of the fixing block, one end of the screw is located outside the fixing block, and the screw is threadedly connected to the inner wall of the corresponding support plate. Beneficial effects

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] This invention, by observing the scratch marks on the colored wax plate, can detect the distance the movable plate moves towards the crane's telescopic boom, thus indirectly reflecting the structural deformation caused by the dent in the outer wall of the crane's telescopic boom. This allows for timely detection of dents caused by load on the crane's telescopic boom, preventing the accumulation of dents from damaging the structural integrity of the boom. Simultaneously, by monitoring the relative state of the movable plate and the supporting cross plate, it can detect changes in the precision of the guide structure's fit in advance, such as track misalignment or abnormal gaps caused by boom dents. This reduces telescopic jamming, abnormal noises, and component wear, ensuring the stability of the boom's telescopic movement and extending the service life of the guide structure and the boom. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is the utility model Figure 1 A magnified view of the structure at point A in the middle;

[0015] Figure 3 This is an enlarged structural diagram of the fixed block and the movable plate in this utility model. Figure 1 ;

[0016] Figure 4 This is an enlarged structural diagram of the fixed block and the movable plate in this utility model. Figure 2 .

[0017] In the diagram: 1. Crane telescopic boom; 11. Guide sleeve; 2. Fixing block; 21. Support plate; 22. Through hole; 23. Fixing plate; 24. Screw; 3. Movable plate; 31. Clearance notch; 32. Roller; 33. Center hole; 34. Compression spring; 35. Guide rod; 36. Infrared rangefinder; 37. Colored wax plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 The guide structure for extending the main boom of a crawler crane includes a crane telescopic main boom 1 and three guide sleeves 11, with four fixing blocks 2 on the outer side of each of the three guide sleeves 11.

[0020] The inner wall of the fixed block 2 is slidably connected to a support plate 21, the support plate 21 is provided with a movable plate 3, the support plate 21 is provided with a through hole 22, and the movable plate 3 is slidably connected to the inner wall of the corresponding through hole 22.

[0021] It should be noted that this embodiment is described.

[0022] The bottom of the movable plate 3 has a clearance notch 31, and a roller 32 is rotatably connected to the inner wall of the clearance notch 31. The roller 32 is slidably connected to the side wall of the corresponding section of the crane telescopic main boom 1.

[0023] It should be noted that the movable plate 3 described in this embodiment contacts the telescopic boom 1 of the crane via rollers 32.

[0024] A colored wax plate 37 is provided on one side of the movable plate 3, and the colored wax plate 37 is in contact with the inner wall of the through hole 22.

[0025] It should be noted that, in this embodiment, the support plate 21 scrapes the colored wax plate 37 through the top edge of the through hole 22 to detect the distance that the movable plate 3 moves toward the crane telescopic main boom 1.

[0026] Specifically, to address the issues of easy denting and deformation of the main boom and the impact on the guide structure, the crane telescopic main boom 1, serving as the basic load-bearing and moving body, uses three guide sleeves 11 to slide and guide the corresponding boom segments. The guide sleeves 11 are positioned by four fixed blocks 2 on their outer sides. The inner walls of the fixed blocks 2 provide sliding guidance for the support cross plate 21, allowing the support cross plate 21 to move relative to the fixed blocks 2. The movable plate 3 adjusts its position through sliding engagement with the through holes 22 on the support cross plate 21. Rollers 32 within the bottom clearance notch 31 contact the side walls of the corresponding boom segments of the crane telescopic main boom 1, utilizing rolling friction to both assist the movable plate 3 in stably following the telescopic guidance of the crane telescopic main boom 1 and reduce wear on the side walls of the crane telescopic main boom 1. When the crane telescopic main boom 1 bears lifting loads, its own weight, or impact loads, causing wear on the outer walls of the boom segment docking area, etc., When localized indentation and deformation cause the movable plate 3 to abnormally approach the support horizontal plate 21 towards the crane telescopic boom 1, the top edge of the through hole 22 of the support horizontal plate 21 will scrape the colored wax plate 37 on the movable plate 3. By observing the shape of the scraped marks on the colored wax plate 37, the distance the movable plate 3 approaches the crane telescopic boom 1 can be detected, thus indirectly reflecting the structural deformation caused by the indentation of the outer wall of the crane telescopic boom 1. This allows for timely detection of indentation problems caused by load on the crane telescopic boom 1, preventing the accumulation of indentations from damaging the structural integrity of the boom. At the same time, by monitoring the relative state of the movable plate 3 and the support horizontal plate 21, changes in the fit accuracy of the guide structure can be detected in advance, such as track offset and abnormal gaps caused by boom indentation. This reduces telescopic jamming, abnormal noise, and component wear, ensuring the telescopic stability of the boom and extending the service life of the guide structure and the boom.

[0027] In one embodiment of this utility model, such as Figures 1-4 As shown, a fixing plate 23 is installed on the inner wall of the through hole 22, and a central hole 33 is opened on the movable plate 3. The fixing plate 23 is slidably connected to the inner wall of the central hole 33.

[0028] It should be noted that the fixed block 2 described in this embodiment restricts the range of motion of the movable plate 3 through the fixed plate 23 and the central hole 33.

[0029] Specifically, the fixed plate 23 on the fixed block 2 is slidably connected to the central hole 33 of the movable plate 3 to form a limiting structure. When the movable plate 3 moves with the crane telescopic main boom 1 or changes position due to the force on the main boom, the fixed plate 23 slides along the inner wall of the central hole 33. The two work together to strictly limit the range of motion of the movable plate 3, allowing it to move only within a specific trajectory. This ensures that the movable plate 3 will not deviate excessively due to the swaying of the crane telescopic main boom 1 or the force applied. At the same time, it ensures that the colored wax plate 37 on the movable plate 3 can stably contact the inner wall of the through hole 22, so that the scratch marks accurately reflect the movement of the movable plate 3.

[0030] In one embodiment of this utility model, such as Figures 1-4As shown, a compression spring 34 is installed on the inner wall of the central hole 33, and the top of the compression spring 34 contacts the bottom of the fixing plate 23.

[0031] It should be noted that the compression spring 34 described in this embodiment pushes the movable plate 3 downward with the fixed plate 23 as the support base.

[0032] Specifically, the top of the compression spring 34 installed on the inner wall of the central hole 33 contacts the bottom of the fixed plate 23, and the fixed plate 23 serves as the support base to generate a downward thrust on the movable plate 3, so that the movable plate 3 always tends to move closer to the crane telescopic boom 1. This ensures that the roller 32 in the clearance notch 31 at the bottom of the movable plate 3 continues to be in close contact with the side wall of the corresponding section of the crane telescopic boom 1. At the same time, it ensures that the colored wax plate 37 on the movable plate 3 remains stably attached to the inner wall of the through hole 22. When the outer wall of the crane telescopic boom 1 is recessed due to load, causing the position of the movable plate 3 to change, the compression spring 34 will adaptively adjust the position of the movable plate 3 through its elasticity, so that the roller 32 always fits against the side wall of the boom. At the same time, it causes the colored wax plate 37 to slide relative to the inner wall of the through hole 22, forming observable scratches, thereby accurately reflecting the displacement change of the movable plate 3.

[0033] In one embodiment of this utility model, such as Figures 1-4 As shown, a guide rod 35 is installed in the central hole 33, and a compression spring 34 is sleeved on the outside of the corresponding guide rod 35. The guide rod 35 passes through the top of the fixing plate 23.

[0034] It should be noted that the fixed plate 23 described in this embodiment provides sliding guidance for the movable plate 3 and the guide rod 35.

[0035] Specifically, during operation, the compression spring 34, supported by the fixed plate 23, exerts a downward pushing force on the movable plate 3, causing the roller 32 at the bottom of the movable plate 3 to continuously adhere to the side wall of the crane telescopic boom 1. At the same time, the guide rod 35 slides axially under the constraint of the fixed plate 23, limiting the radial displacement of the compression spring 34, ensuring the stability of its elastic force direction, and preventing the spring from twisting and causing the movable plate 3 to become unbalanced. When the crane telescopic boom 1 is dented or the position of the movable plate 3 changes, the guide rod 35 slides synchronously along the fixed plate 23 with the movable plate 3, cooperating with the adaptive elastic force adjustment of the compression spring 34 to ensure stable contact between the colored wax plate 37 and the inner wall of the through hole 22 and to produce reliable scratches, accurately reflecting the displacement state of the movable plate 3.

[0036] In one embodiment of this utility model, such as Figures 1-4 As shown, an infrared rangefinder 36 is embedded in the top side of the central hole 33, and the infrared rangefinder 36 is located above the corresponding fixing plate 23.

[0037] Specifically, when the outer wall of the crane telescopic boom 1 is dented due to load, and the movable plate 3 moves closer to the boom under the action of the compression spring 34, the movable plate 3 drives the infrared rangefinder 36 to move down synchronously, causing a change in the distance between it and the fixed plate 23. The infrared rangefinder 36 converts the distance data into an electrical signal output. This structure, combined with the sliding guidance of the guide rod 35 and the elastic support of the compression spring 34, and based on the visual feedback of scratches on the colored wax plate 37, achieves precise quantitative monitoring of the displacement of the movable plate 3 through infrared ranging, further improving the detection accuracy and response speed of the dent deformation of the outer wall of the crane telescopic boom 1.

[0038] In one embodiment of this utility model, such as Figures 1-4 As shown, a screw 24 is rotatably connected to the inner wall of the fixing block 2. One end of the screw 24 is located on the outside of the fixing block 2, and the screw 24 is threaded to the inner wall of the corresponding support plate 21.

[0039] It should be noted that, in this embodiment, the screw 24 is used to adjust the length of the support plate 21 extending out of the fixing block 2 when it rotates.

[0040] Specifically, when the screw 24 is rotated, the thread transmission principle drives the support plate 21 to slide along the inner wall of the fixed block 2, thereby adjusting the length of the support plate 21 extending out of the fixed block 2. During this adjustment process, the support plate 21 drives the movable plate 3 to move synchronously, thereby changing the initial contact position between the roller 32 on the movable plate 3 and the side wall of the crane telescopic boom 1, as well as the initial contact state between the colored wax plate 37 and the inner wall of the through hole 22. This achieves adaptive adjustment of the fit clearance between the guide structure and the crane telescopic boom 1, so as to match the boom segments with different wear levels or meet the guidance requirements under different working conditions, ensuring that the guide structure always maintains stable guiding performance and accurate deformation detection capability.

[0041] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0042] Working principle: This guide structure is based on the crane telescopic main boom 1. Three guide sleeves 11 slide and guide the corresponding sections of the crane telescopic main boom 1. The guide sleeves 11 are installed and positioned by four fixed blocks 2 on the outside. The support cross plate 21 inside the fixed block 2 is adjustable. The movable plate 3 cooperates with the support cross plate 21 through the through hole 22. The bottom roller 32 contacts the side wall of the main boom, using rolling friction to assist in stabilizing the guide and reduce wear. The colored wax plate 37 on the movable plate 3 contacts the inner wall of the through hole 22. When the outer wall of the main boom is concave due to load, the movable plate 3 moves closer to the main boom, and the edge of the through hole 22 scrapes the wax plate to shape. The traces reflect the deformation of the main arm. The fixed plate 23 in the through hole 22 slides with the central hole 33 of the movable plate 3, limiting the displacement of the movable plate 3 and ensuring stable contact of the wax plate. The compression spring 34 in the central hole 33 pushes the movable plate 3 down with the fixed plate 23 as support, ensuring that the roller 32 continuously fits the main arm. The guide rod 35 constrains the radial displacement of the spring to avoid force imbalance. The infrared rangefinder 36 on the top side of the central hole 33 measures the distance between the movable plate 3 and the fixed plate 23 in real time and quantifies the displacement feedback. The screw 24 of the rotating fixed block 2 can adjust the extension length of the support cross plate 21 to adapt to different working conditions and ensure the stability of the guide and the accuracy of deformation detection.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A guide structure for the extension of the main boom of a caterpillar crane, comprising a telescopic main boom (1) of the crane and three guide sleeves (11), characterized in that, Four fixing blocks (2) are provided on the outer side of each of the three guide sleeves (11), wherein, The inner wall of the fixed block (2) is slidably connected to a support plate (21), and a movable plate (3) is provided on the support plate (21). A through hole (22) is opened on the support plate (21), and the movable plate (3) is slidably connected to the inner wall of the corresponding through hole (22). The bottom of the movable plate (3) is provided with a clearance notch (31), and a roller (32) is rotatably connected to the inner wall of the clearance notch (31). The roller (32) is slidably connected to the side wall of the corresponding section of the telescopic main boom (1) of the crane. A colored wax plate (37) is provided on one side of the movable plate (3), and the colored wax plate (37) is in contact with the inner wall of the through hole (22).

2. The guide structure for extension of a main boom of a cable crane according to claim 1, characterized in that, A fixing plate (23) is installed on the inner wall of the through hole (22), and a central hole (33) is opened on the movable plate (3). The fixing plate (23) is slidably connected to the inner wall of the central hole (33).

3. The guide structure for extending the main boom of a crawler crane according to claim 2, characterized in that, A compression spring (34) is installed on the inner wall of the central hole (33), and the top of the compression spring (34) contacts the bottom of the fixing plate (23).

4. The guide structure for extension of a main boom of a cable crane according to claim 3, characterized in that, A guide rod (35) is installed in the central hole (33), and a compression spring (34) is sleeved on the outside of the guide rod (35). The guide rod (35) passes through the top of the fixing plate (23).

5. The guide structure for extension of the main boom of a cable crane according to claim 4, characterized in that, An infrared rangefinder (36) is embedded in the top side of the central hole (33), and the infrared rangefinder (36) is located above the corresponding fixing plate (23).

6. The guide structure for extension of a main boom of a cable crane according to claim 1, characterized in that, The inner wall of the fixing block (2) is rotatably connected to a screw (24), one end of which is located outside the fixing block (2), and the screw (24) is threadedly connected to the inner wall of the corresponding support plate (21).

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