Telescopic arm with anti-sagging arm tube and elimination of in-place wobble gap and adjustment method thereof

Abstract

The application discloses a telescopic arm with functions of preventing arm pipe from drooping and eliminating the gap of in-place shaking, and an adjusting method thereof. The telescopic arm comprises five-section arms and a telescopic mechanism. The five-section arms can perform telescopic action under the driving of the telescopic mechanism. The end of each section arm installed in the upper section arm is a tail part, and the end of the next section arm installed is a mouth part. The main body structure of each section arm is an arm weldment, and the inner wall surface of the arm weldment is provided with a guide rail. The tail part of the arm weldment is provided with a tail part pulley assembly, a tail part upper sliding block and a tail part lower sliding block. The mouth part of the arm weldment is provided with a mouth part guide sliding block and a mouth part pulley assembly. The application can guarantee high-precision straightness of unfolding, eliminate the structural gap between the arm pipes of different levels, prevent the telescopic arm from shaking due to the gap under the condition of strong wind, and affect the radar precision.

Description

Technical Field

[0001] This invention belongs to the field of telescopic boom technology, specifically relating to a telescopic boom that prevents the boom tube from sagging and eliminates the gap during positioning, as well as its adjustment method. Background Technology

[0002] Existing horizontal telescopic boom structures primarily focus on achieving telescopic functionality and ensuring the load strength of the telescopic axis. Excessive resistance between boom segments leads to high driving force. The connection between boom segments is achieved through a flexible chain drive mechanism with relatively low stiffness. Furthermore, the driving structure has a large mass, and high resistance between boom segments can cause crawling. Therefore, it is necessary to reduce inter-boom resistance to ensure smooth and stable movement. Traditional telescopic boom structures generally employ a slider-guided design, requiring guide rails inside the boom tube for full-range guidance. Consequently, the boom tube structure often uses a two-part assembly method, with the internal guide rails machined before assembly. This structure involves significant machining workload and requires high precision, resulting in lower structural strength compared to integral molding. While this slider-guided design is acceptable for vertical telescopic extension or when no load is carried at a certain angle (e.g., crane booms), it fails to reduce inter-boom resistance during horizontal extension and retraction with a significant load.

[0003] Furthermore, existing horizontal telescopic booms do not have special requirements for the straightness of the boom after deployment. However, as the main frame for carrying the radar array, it is necessary to ensure high precision in the straightness of deployment while ensuring functionality and load capacity. It is also necessary to eliminate the structural gaps between the boom tubes at each level to prevent gap swaying of the telescopic boom in windy conditions, which would affect the accuracy of the radar. Summary of the Invention

[0004] In view of this, the present invention provides a telescopic boom and its adjustment method that prevents the boom tube from sagging and eliminates gaps in positioning. It can ensure high precision in deployment straightness while maintaining functionality and load capacity, and can eliminate structural gaps between different stages of the boom tube, preventing gap swaying of the telescopic boom in windy conditions, which would affect radar accuracy.

[0005] This invention is achieved through the following technical solution:

[0006] A telescopic boom that prevents the boom tube from sagging and eliminates the gap during positioning includes: a five-section boom and a telescopic mechanism;

[0007] The five-section arm can extend and retract under the drive of the telescopic mechanism; the end of each section of the five-section arm installed in the upper section is the tail, and the end installed in the lower section is the mouth.

[0008] The main structure of each arm segment is an arm welded assembly, with guide rails on the inner wall of the arm welded assembly; the tail end of the arm welded assembly is equipped with a tail pulley assembly, a tail upper slider, and a tail lower slider; the opening end of the arm welded assembly is equipped with an opening guide slider and an opening pulley assembly.

[0009] The four side walls of the arm weld assembly are the upper side wall, the lower side wall, the left side wall, and the right side wall;

[0010] Two tail pulley assemblies are mounted side-by-side on the upper sidewall of the tail of the arm welded assembly. Each tail pulley assembly is equipped with a screw adjustment mechanism for adjusting the position of the tail pulley assembly. The upper tail slider and the lower tail slider are both mounted on the outer wall surface of the tail of the arm welded assembly.

[0011] Two mouth pulley assemblies are mounted side by side on the lower side wall of the mouth of the arm welded assembly. Each mouth pulley assembly is provided with an eccentric adjustment mechanism, which is used to adjust the position of the mouth pulley assembly.

[0012] Four guide sliders are installed at the four corners of the inner wall of the arm weld assembly opening, and the positions of the four guide sliders are adjustable.

[0013] Furthermore, the positions of the four guide sliders are adjusted by the upper adjusting bolt, the upper lateral adjusting bolt, and the lower lateral adjusting bolt;

[0014] The two guide sliders located on the upper sidewall of the arm welded body are both L-shaped blocks, and the two opening guide sliders located on the lower sidewall of the arm welded body correspond one-to-one with the two opening pulley assemblies to form an L-shaped structure.

[0015] Both upper adjusting bolts are installed on the upper side wall of the arm welded joint opening and abut against one side of the corresponding L-shaped block. The two upper lateral adjusting bolts are installed on the left and right side walls of the arm welded joint opening and abut against the other side of the corresponding L-shaped block. That is, each L-shaped block has one upper adjusting bolt and one upper lateral adjusting bolt. The upper adjusting bolt is used to adjust the vertical height of the L-shaped block, and the upper lateral adjusting bolt is used to adjust the left and right lateral position of the L-shaped block.

[0016] Two lower lateral adjustment bolts are respectively installed on the left and right side walls of the opening of the arm welded assembly, and respectively abut against the corresponding L-shaped structure opening guide slider. The lower lateral adjustment bolts are used to adjust the left and right lateral positions of the L-shaped structure opening guide slider.

[0017] Furthermore, the tail pulley assembly consists of several rollers, which are used to provide support for the sliding of the current segment within the previous segment.

[0018] The mouth pulley assembly consists of several rollers, which provide support and guidance for the sliding of the next stage arm within the current stage arm.

[0019] Furthermore, the eccentric adjustment mechanism adopts a pulley eccentric spindle, and the rollers of the mouth pulley assembly are all mounted on the pulley eccentric spindle. The pulley eccentric spindle is coaxially connected with the lower pulley adjusting bolt. By rotating the lower pulley adjusting bolt, the rotation angle of the pulley eccentric spindle, i.e. the eccentric position, is adjusted, thereby causing the position of the rollers of the L-shaped mouth pulley assembly to move up and down.

[0020] Furthermore, after each arm segment is fully extended, a positioning block with a set slope is installed at the intersection with the previous arm segment. The positioning block is used to assist the tail pulley assembly, mouth pulley assembly, upper adjusting bolt, upper lateral adjusting bolt, and lower lateral adjusting bolt in adjusting the gap at the intersection of the current arm segment and the previous arm segment.

[0021] Furthermore, the positioning block includes two parallel upper positioning blocks located on the inner wall of the arm tube and two right-angle positioning blocks located at the intersection of the left and lower side walls and the right and lower side walls of the outer wall of the arm tube, respectively. Each positioning block on the outer wall has a transition slope in the direction of the arm tube opening, and each positioning block on the inner wall has a transition slope in the direction of the arm tube tail.

[0022] Furthermore, the five-section arm includes: a first section arm, a second section arm, a third section arm, a fourth section arm, and a fifth section arm;

[0023] The diameters of the first, second, third, fourth, and fifth arm sections decrease sequentially, and they are nested and slidably connected in sequence. The first arm section is in a fixed state, while the second, third, fourth, and fifth arm sections extend and retract synchronously.

[0024] The telescopic mechanism includes: a drive assembly and a chain drive assembly;

[0025] The drive assembly can be a lead screw drive, a hydraulic cylinder, or an electric cylinder, used to drive the extension and retraction of the second arm within the first arm.

[0026] The chain drive assembly employs a rope system to drive the telescopic movement of the third, fourth, and fifth arm sections, including: a third extension chain, a fourth extension chain, a fifth extension chain, a third retraction chain, a fourth retraction chain, and a fifth retraction chain; the third extension chain and the third retraction chain are respectively mounted on the third arm section to drive the telescopic movement of the third arm section within the second arm section; the fourth extension chain and the fourth retraction chain are respectively mounted on the fourth arm section to drive the telescopic movement of the fourth arm section within the third arm section; and the fifth extension chain and the fifth retraction chain are respectively mounted on the fifth arm section to drive the telescopic movement of the fifth arm section within the fourth arm section.

[0027] An adjustment method for a telescopic boom that prevents boom tube sagging and eliminates positioning sway gap, the adjustment method comprising: an adjustment method for preventing boom tube sagging and an adjustment method for eliminating positioning sway gap;

[0028] The method for preventing the boom tube from sagging is as follows: After the telescopic boom is fully extended, adjust the position of the tail pulley assembly and the mouth pulley assembly in all boom sections:

[0029] When adjusting the position of the tail pulley assembly, the position of the tail pulley assembly is adjusted by the rotating screw adjustment mechanism of the current arm. During adjustment, tighten the screw adjustment mechanism to move the tail pulley assembly upward until the tail pulley assembly is pressed against the inner wall surface of the arm tube of the previous arm.

[0030] When adjusting the position of the opening pulley assembly, the lower pulley adjusting bolt is rotated to drive the pulley eccentric spindle to rotate. Due to the eccentricity of the pulley eccentric spindle, the rollers in the opening pulley assembly will move up and down accordingly, thereby generating a pre-elevation angle in the boom tube of the next stage boom. The size of the pre-elevation angle is determined according to the self-weight of the boom tube and the load, and is used to counteract the bending moment deformation of the telescopic boom under its own weight and load, thereby ensuring the straightness of the telescopic boom after it is deployed.

[0031] The adjustment method for eliminating the gap during positioning is as follows: After the telescopic arm is extended to its final position, adjust the upper adjusting bolt, the upper lateral adjusting bolt, and the lower lateral adjusting bolt so that the guide slider at the opening of the upper-level arm section is in close contact with the positioning block on the outer wall surface of the current arm section, eliminating the gap between the guide slider at the opening of the upper-level arm section and the outer wall surface of the current arm section, thereby preventing structural swaying due to the gap between the arm sections in strong winds; at the same time, when the current arm section is extended to its final position, the positioning block inside the upper-level arm section contacts the tail pulley assembly of the current arm section, and adjusting the tail pulley assembly can eliminate the gap between the tail sections of the arm sections; the positioning block outside the current arm section contacts the opening pulley assembly and the opening guide slider of the upper-level arm section, and adjusting the opening pulley assembly and the opening guide block can eliminate the gap in the middle of the arm section.

[0032] Beneficial effects:

[0033] (1) The present invention provides a telescopic arm that prevents the arm tube from sagging and eliminates the gap of swaying when in position. It is used to carry a radar array antenna for horizontal deployment and retraction. The telescopic arm overcomes the problem of arm tube sagging caused by the weight of the load and the telescopic arm itself after deployment. The vertical position of the tail pulley assembly, mouth pulley assembly and mouth guide slider of all the arms of the telescopic arm can be finely adjusted. The distance between the tail pulley assembly and the arm that cooperates with it is adjusted by a screw adjustment mechanism for stepless adjustment. The gap between the mouth pulley assembly and the arm that cooperates with it is adjusted by an eccentric adjustment mechanism. The structural gap between each arm tube can be effectively eliminated by setting the adjustable position of the above components (i.e., tail pulley assembly, mouth pulley assembly and mouth guide slider) to prevent the gap of the arm tube from swaying.

[0034] (2) This invention provides a telescopic boom that prevents the boom tube from sagging and eliminates the gap of swaying during positioning. It uses a combination of rollers and sliders to reduce resistance. The tail pulley assembly and the mouth pulley assembly of this invention are both composed of several rollers. That is, the telescopic movement between the boom sections is replaced by the sliding of the sliders by the sliding of the rollers. The friction coefficient of the rollers is between 0.002 and 0.005, while the friction coefficient of the sliders is between 0.15 and 0.3. Rolling friction replaces sliding friction. It can be seen that this invention can significantly reduce the friction coefficient between the boom sections. Therefore, this invention combines rollers and sliders. During the telescopic process, the force contact part is connected by rollers, and the non-force contact surface is connected and guided by sliders, which saves space, reduces weight, lowers damping, and improves efficiency.

[0035] (3) This invention provides a telescopic boom that prevents the boom tube from sagging and eliminates gaps during positioning. Each boom segment, after being fully extended, has a positioning block with a set slope installed at its intersection with the previous boom segment. The positioning block assists the pulley assembly and adjusting bolts in adjusting the gap between the current boom segment and the previous boom segment. This invention uses positioning blocks to control the gap, which has relatively low requirements for the boom tube's shape and internal spacing dimensions. Therefore, it can use pre-formed rectangular profiles, significantly saving manufacturing costs and shortening the processing cycle.

[0036] (4) The present invention provides an adjustment method for a telescopic arm that prevents the arm tube from sagging and eliminates the gap of swaying when in place. The upper side of the tail of the arm tube is provided with a tail pulley assembly and the lower side of the mouth is provided with a mouth pulley assembly. The tail can be adjusted up and down by lifting through a screw adjustment mechanism. The mouth roller shaft is designed as a pulley eccentric spindle. By rotating the pulley eccentric spindle, the roller of the mouth pulley assembly can be adjusted up and down. By adjusting the roller, the gap can be adjusted. At the same time, the up and down adjustment of the roller can be used to give the arm tube a pre-tilt angle to counteract the sagging caused by the load and self-weight of the telescopic arm after it is deployed, thereby ensuring the straightness of the telescopic arm after it is deployed.

[0037] The adjustment method adopts an adjustable positioning gap design. All arm tube openings are equipped with opening guide sliders on the left, right, and upper sides. The positioning gap can be controlled by adjusting the position of the opening guide sliders.

[0038] This adjustment method uses positioning blocks to eliminate gaps and control positioning accuracy. The positioning blocks transition with the running path surface using a sloped surface. Inside the boom tube, there are welded or riveted guide rails with a protruding slope at the end of the guide rails. There are also protruding positioning blocks on the outside of the boom tube. When the current boom section extends and reaches its position, the positioning block inside the previous boom section contacts the tail pulley assembly of the current boom section to eliminate the gap between the tail sections of the boom tubes. At the same time, the positioning block outside the current boom tube contacts the mouth pulley assembly and mouth guide slider of the previous boom section to eliminate the gap in the middle of the boom tube.

[0039] Because of the adjustable positioning block and positioning gap design, the device has a large movement gap during extension and retraction, and the requirements for the internal cavity or external spacing of the arm tube are not significant. Therefore, the arm tube is manufactured using an integral molding method, which not only ensures strength but also significantly reduces the weight of the arm tube, while eliminating the need for precision machining. Compared with conventional telescopic arm structures, the adjustable gap design of this invention not only optimizes the component processing flow but also precisely controls the positioning gap and can optimize the straightness of the long arm structure to a certain extent. Attached Figure Description

[0040] Figure 1 This is an overall structural diagram of the present invention;

[0041] Figure 2 This is an overall structural diagram of the hidden five-section arm of the present invention;

[0042] Figure 3 for Figure 2 Top view;

[0043] Figure 4 This is a structural diagram of the segment arm of the present invention;

[0044] Figure 5 for Figure 4 A magnified view of point I;

[0045] Figure 6 for Figure 4 Enlarged view at point II;

[0046] Figure 7 This is a connection diagram of the tail pulley assembly and the screw adjustment mechanism.

[0047] Figure 8 This is a connection diagram of the mouth pulley assembly and the pulley eccentric spindle;

[0048] Figure 9 This is a diagram showing the fit between the tail pulley assembly and the inclined surface of the present invention;

[0049] Figure 10 This is an assembly drawing of the limiting block of the present invention;

[0050] Wherein, 1-first arm section, 2-second arm section, 3-third arm section, 4-fourth arm section, 5-fifth arm section, 6-third extension chain section, 7-fourth extension chain section, 8-fifth extension chain section, 9-third retraction chain section, 10-fourth retraction chain section, 11-fifth retraction chain section, 12-drive assembly;

[0051] 21-Arm welded assembly, 22-Tail pulley assembly, 23-Converter mounting base, 24-Tail upper slider, 25-Tail lower slider, 26-Orifice guide slider, 27-Upper adjusting bolt, 28-Upper lateral adjusting bolt, 29-Lower pulley adjusting bolt, 30-Orifice pulley assembly, 31-Lower lateral adjusting bolt, 32-Inclined surface, 33-Upper limit block, 34-Lower limit block, 35-Screw adjustment mechanism, 36-Pulley eccentric spindle. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] Example 1:

[0054] This embodiment provides a telescopic boom that prevents the boom tube from sagging and eliminates the gap during positioning, including: a five-section boom and a telescopic mechanism;

[0055] The five-section arm includes: first section arm 1, second section arm 2, third section arm 3, fourth section arm 4, and fifth section arm 5;

[0056] See appendix Figure 1 The diameters of the first arm 1, second arm 2, third arm 3, fourth arm 4, and fifth arm 5 decrease sequentially, and they are nested and slidably connected in sequence. Specifically, the second arm 2 is slidably connected inside the first arm 1 and can extend and retract within the first arm 1; the third arm 3 is slidably connected inside the second arm 2 and can extend and retract within the second arm 2; the fourth arm 4 is slidably connected inside the third arm 3 and can extend and retract within the third arm 3; and the fifth arm 5 is slidably connected inside the fourth arm 4 and can extend and retract within the fourth arm 4. The first arm 1 is in a fixed state, while the second arm 2, third arm 3, fourth arm 4, and fifth arm 5 extend and retract synchronously.

[0057] The telescopic mechanism includes: a drive assembly 12 and a chain drive assembly;

[0058] See appendix Figure 2-3The drive assembly 12 can be a lead screw drive, a hydraulic cylinder, or an electric cylinder, used to drive the extension and retraction of the second arm 2 within the first arm 1; in this embodiment, the drive assembly 12 is a lead screw drive, including a lead screw motor, a lead screw, and a nut; the lead screw motor is fixed on the first arm 1, the nut is fixed on the second arm 2, the lead screw is arranged along the length of the five arms, one end of which is connected to the output shaft of the lead screw motor, and the other end is threadedly engaged with the nut;

[0059] The chain drive assembly employs a rope system to drive the telescopic movement of the third arm 3, the fourth arm 4, and the fifth arm 5. It includes: a third extension chain 6, a fourth extension chain 7, a fifth extension chain 8, a third retraction chain 9, a fourth retraction chain 10, and a fifth retraction chain 11. The third extension chain 6 and the third retraction chain 9 are respectively mounted on the third arm 3 to drive the telescopic movement of the third arm 3 within the second arm 2. The fourth extension chain 7 and the fourth retraction chain 10 are respectively mounted on the fourth arm 4 to drive the telescopic movement of the fourth arm 4 within the third arm 3. The fifth extension chain 8 and the fifth retraction chain 11 are respectively mounted on the fifth arm 5 to drive the telescopic movement of the fifth arm 5 within the fourth arm 4.

[0060] Among them, the first arm 1, the second arm 2, the third arm 3, the fourth arm 4 and the fifth arm 5 are collectively referred to as arms. The end of each arm installed in the previous arm is called the tail, and the end installed in the next arm is called the mouth. For example, the end of the second arm 2 installed in the first arm 1 is the tail, and the end installed in the third arm 3 is the mouth.

[0061] The second arm 2, the third arm 3, and the fourth arm 4 have the same mouth structure but different sizes, and the second arm 2, the third arm 3, and the fourth arm 4 also have the same tail structure but different sizes; the first arm 1 has the same mouth structure as the second arm 2, and the fifth arm 5 has the same tail structure as the fourth arm 4.

[0062] See appendix Figure 4 Each arm segment has a main structure of arm welded assembly 21; the arm welded assembly 21 is an arm tube with a rectangular cross-section, which is the load-bearing and carrier component of the arm segment; the arm welded assembly 21 is an arm tube with a rectangular cross-section, and the inner wall of the arm tube is provided with welded or riveted guide rails, which are used to guide and support the sliding of the next stage arm segment within the current arm segment.

[0063] See appendix Figure 5 The tail structure includes: a tail pulley assembly 22, a converter mounting base 23, an upper tail slider 24, and a lower tail slider 25; see attached diagram. Figure 6The mouth structure includes: a mouth guide slider 26, an upper adjusting bolt 27, an upper lateral adjusting bolt 28, a lower pulley adjusting bolt 29, a mouth pulley assembly 30, and a lower lateral adjusting bolt 31;

[0064] The four side walls of the arm welded assembly 21 are the upper side wall, the lower side wall, the left side wall, and the right side wall, respectively.

[0065] Two tail pulley assemblies 22 are mounted side-by-side on the upper sidewall of the arm welded body 21 (i.e., the tail section of the boom). The axial direction of the tail pulley assembly 22 is parallel to the upper sidewall of the arm welded body 21 and perpendicular to the left (or right) sidewall. The tail pulley assembly 22 consists of several rollers and is used to provide support for the sliding of the current boom section within the previous boom section. Each tail pulley assembly 22 is provided with a screw adjustment mechanism 35, which is used to adjust the height of the working surface of the tail pulley assembly 22 relative to the outer wall surface of the upper sidewall of the arm welded body 21, as shown in the attached figure. Figure 7 As shown, the position of the tail pulley assembly 22 can be moved up and down by adjusting the screw adjustment mechanism 35;

[0066] The upper tail slider 24 and the lower tail slider 25 are both installed on the outer wall surface of the tail of the arm welded body 21, and are used to provide guidance and support for the sliding of the current arm segment within the previous arm segment.

[0067] The converter mounting base 23 is installed inside the tail of the arm welded body 21 and is used to connect to the drive assembly 12, such as a lead screw, hydraulic cylinder or electric cylinder, as a force transmission component.

[0068] Two mouth pulley assemblies 30 are mounted side-by-side on the lower sidewall of the arm welded assembly 21. The axial direction of the mouth pulley assembly 30 is parallel to the lower sidewall of the arm welded assembly 21 and perpendicular to the left (or right) sidewall. Each mouth pulley assembly 30 consists of several rollers, providing support and guidance for the sliding of the next-stage arm segment within the current arm segment. Each mouth pulley assembly 30 is equipped with an eccentric adjustment mechanism to adjust the height of the working surface of the mouth pulley assembly 30 relative to the inner wall of the lower sidewall of the arm welded assembly 21. The eccentric adjustment mechanism uses a pulley eccentric spindle 36, and the rollers of the mouth pulley assembly 30 are all mounted on the pulley eccentric spindle 36. Figure 8 As shown, the position of the roller in the mouth pulley assembly 30 can be moved up and down by rotating the pulley eccentric spindle 36;

[0069] The four mouth guide sliders 26 are respectively installed at the four corners of the inner wall of the mouth of the arm welded body 21, and are used to provide guidance and support for the sliding of the next stage arm segment within the current arm segment; wherein, the two guide sliders 26 located on the upper side wall of the arm welded body 21 are both L-shaped blocks, and the two mouth guide sliders 26 located on the lower side wall of the arm welded body 21 are respectively corresponding to the two mouth pulley assemblies 30 to form an L-shaped structure;

[0070] Both upper adjusting bolts 27 are installed on the upper side wall of the opening of the arm welded body 21 and abut against one side of the corresponding L-shaped block. Two upper lateral adjusting bolts 28 are installed on the left and right side walls of the opening of the arm welded body 21 and abut against the other side of the corresponding L-shaped block. That is, each L-shaped block corresponds to one upper adjusting bolt 27 and one upper lateral adjusting bolt 28. The upper adjusting bolt 27 is used to adjust the vertical height of the L-shaped block, and the upper lateral adjusting bolt 28 is used to adjust the left and right lateral position of the L-shaped block.

[0071] Two lower lateral adjustment bolts 31 are respectively installed on the left and right side walls of the opening of the arm welded body 21, and respectively abut against the corresponding L-shaped structure opening guide slider 26. The lower lateral adjustment bolts 31 are used to adjust the left and right lateral positions of the L-shaped structure opening guide slider 26.

[0072] The two lower pulley adjusting bolts 29 are respectively connected to two eccentric adjustment mechanisms, that is, respectively coaxially connected to two pulley eccentric spindles 36, and are used to adjust the rotation angle (i.e. eccentric position) of the pulley eccentric spindles 36, thereby causing the roller position of the L-shaped structure opening pulley assembly 30 to move up and down.

[0073] Each segment arm has a bevel 32 with a set slope on its inner wall surface at the opening and tail. The bevel 32 is located at both ends of the guide rail within the segment arm, as shown in the attached diagram. Figure 9 As shown, the inclined surface 32 is used to limit and remind the next stage segment arm that slides within the current segment arm to extend into place or retract into place.

[0074] Each boom segment's tail outer wall surface (i.e., the intersection with the previous boom segment after deployment) is equipped with a positioning block with a set slope, as shown in the attached diagram. Figure 10As shown, the positioning block is used to assist the tail pulley assembly, mouth pulley assembly, upper adjusting bolt, upper lateral adjusting bolt, and lower lateral adjusting bolt in adjusting the gap at the intersection of the current arm segment and the previous arm segment. The positioning block includes two parallel upper positioning blocks on the inner wall of the arm tube and two right-angle positioning blocks on the outer wall of the arm tube at the intersection of the left and lower side walls and the right and lower side walls, respectively. Each positioning block on the outer wall has a transition slope in the direction of the arm tube opening, and each positioning block on the inner wall has a transition slope in the direction of the arm tube tail.

[0075] The entire five-section arm is externally connected to a telescopic connecting rod, which can extend and retract synchronously with the telescopic arm in this embodiment.

[0076] Example 2:

[0077] Based on Embodiment 1, this embodiment provides an adjustment method for a telescopic boom that prevents the boom tube from sagging and eliminates the gap during positioning. The principle of eliminating the gap during positioning is to eliminate the gap at the working position (fully extended, i.e., fully extended). Gaps exist at other positions (running path). Since an inclined surface 32 is provided on the inner wall of the boom section, when the telescopic boom extends or retracts, there will be a gap between each boom section that is the same as or slightly larger than the height of the inclined surface 32, thereby ensuring that there is no jamming during the telescopic movement.

[0078] The adjustment methods include: methods to prevent arm tube sagging and methods to eliminate positioning sway gaps;

[0079] The method for preventing the boom tube from sagging is as follows: After the telescopic boom is fully extended, adjust the position of the tail pulley assembly 22 and the mouth pulley assembly 30 in all boom sections:

[0080] When adjusting the position of the tail pulley assembly 22, the screw adjustment mechanism 35 is rotated through the hand hole machined on the side of the arm tube of the current arm segment (i.e., the arm welded body 21) to adjust the position of the tail pulley assembly 22. During adjustment, the screw adjustment mechanism 35 is tightened to move the tail pulley assembly 22 upward until the tail pulley assembly 22 is pressed against the inner wall surface of the arm tube of the previous arm segment.

[0081] When adjusting the position of the opening pulley assembly 30, the lower pulley adjusting bolt 29 is rotated to drive the pulley eccentric spindle 36 to rotate. Due to the eccentric design, the rollers in the opening pulley assembly 30 will move up and down accordingly, thereby generating a pre-elevation angle for the boom tube of the next stage boom. The size of the pre-elevation angle is determined according to the self-weight of the boom tube and the load, and is used to counteract the bending moment deformation of the telescopic boom under its own weight and load, thereby ensuring the straightness of the telescopic boom after it is deployed.

[0082] The adjustment method for eliminating the gap during positioning is as follows: After the telescopic arm is extended to its final position, adjust the upper adjusting bolt 27, the upper lateral adjusting bolt 28, and the lower lateral adjusting bolt 31 so that the guide slider 26 at the opening of the upper-level arm section is in close contact with the outer wall surface of the current arm section, eliminating the gap between the guide slider 26 at the opening of the upper-level arm section and the outer wall surface of the current arm section, thereby preventing structural swaying due to the gap between the arm sections in strong winds; at the same time, when the current arm section is extended to its final position, the positioning block inside the upper-level arm section contacts the tail pulley assembly of the current arm section, and adjusting the tail pulley assembly can eliminate the gap between the tail sections of the arm sections; the positioning block outside the current arm section contacts the opening pulley assembly and the opening guide slider of the upper-level arm section, and adjusting the opening pulley assembly and the opening guide block can eliminate the gap in the middle of the arm section; this method of eliminating gaps using inclined surfaces and positioning blocks is also applicable to vertical lifting mechanisms.

[0083] Example 3:

[0084] Based on Embodiment 1, this embodiment can replace the rolling mode of the tail pulley assembly 22 and the mouth pulley assembly 30 with sliding, such as a slider, but the operating power needs to be increased significantly and the tensile load of the transmission chain needs to be greatly improved.

[0085] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A telescopic boom that prevents the boom tube from sagging and eliminates gaps during positioning, characterized in that, include: Five-section boom and telescopic mechanism; The five-section arm can extend and retract under the drive of the telescopic mechanism; the end of each section of the five-section arm installed in the upper section is the tail, and the end installed in the lower section is the mouth. The main structure of each arm segment is an arm welded assembly, with guide rails on the inner wall of the arm welded assembly; the tail end of the arm welded assembly is equipped with a tail pulley assembly, a tail upper slider, and a tail lower slider; the opening end of the arm welded assembly is equipped with an opening guide slider and an opening pulley assembly. The four side walls of the arm weld assembly are the upper side wall, the lower side wall, the left side wall, and the right side wall; Two tail pulley assemblies are mounted side-by-side on the upper sidewall of the tail of the arm welded assembly. Each tail pulley assembly is equipped with a screw adjustment mechanism for adjusting the position of the tail pulley assembly. The upper tail slider and the lower tail slider are both mounted on the outer wall surface of the tail of the arm welded assembly. Two mouth pulley assemblies are mounted side by side on the lower side wall of the mouth of the arm welded assembly. Each mouth pulley assembly is provided with an eccentric adjustment mechanism, which is used to adjust the position of the mouth pulley assembly. Four mouth guide sliders are respectively installed at the four corners of the inner wall of the arm welded assembly mouth, and the positions of the four mouth guide sliders are adjustable.

2. The telescopic boom as described in claim 1, characterized in that, The positions of the four orifice guide sliders are adjusted by the upper adjusting bolt, the upper lateral adjusting bolt, and the lower lateral adjusting bolt; The two opening guide sliders located on the upper sidewall of the arm welded body are both L-shaped blocks, and the two opening guide sliders located on the lower sidewall of the arm welded body correspond one-to-one with the two opening pulley assemblies to form an L-shaped structure. Both upper adjusting bolts are installed on the upper side wall of the arm welded joint opening and abut against one side of the corresponding L-shaped block. The two upper lateral adjusting bolts are installed on the left and right side walls of the arm welded joint opening and abut against the other side of the corresponding L-shaped block. That is, each L-shaped block has one upper adjusting bolt and one upper lateral adjusting bolt. The upper adjusting bolt is used to adjust the vertical height of the L-shaped block, and the upper lateral adjusting bolt is used to adjust the left and right lateral position of the L-shaped block. Two lower lateral adjustment bolts are respectively installed on the left and right side walls of the opening of the arm welded assembly, and respectively abut against the corresponding L-shaped structure opening guide slider. The lower lateral adjustment bolts are used to adjust the left and right lateral positions of the L-shaped structure opening guide slider.

3. A telescopic boom as described in claim 1, characterized in that, The tail pulley assembly consists of several rollers and is used to provide support for the sliding of the current segment within the previous segment. The mouth pulley assembly consists of several rollers, which provide support and guidance for the sliding of the next stage arm within the current stage arm.

4. A telescopic boom as described in claim 3, characterized in that, The eccentric adjustment mechanism adopts a pulley eccentric spindle. The rollers of the mouth pulley assembly are all mounted on the pulley eccentric spindle. The pulley eccentric spindle is coaxially connected with the lower pulley adjusting bolt. By rotating the lower pulley adjusting bolt, the rotation angle of the pulley eccentric spindle, i.e. the eccentric position, is adjusted, thereby causing the position of the rollers of the L-shaped mouth pulley assembly to move up and down.

5. A telescopic boom as described in claim 4, characterized in that, After each arm segment is fully extended, a positioning block with a set slope is installed at the intersection with the previous arm segment. The positioning block is used to assist the tail pulley assembly, mouth pulley assembly, upper adjusting bolt, upper lateral adjusting bolt, and lower lateral adjusting bolt in adjusting the gap at the intersection of the current arm segment and the previous arm segment.

6. A telescopic boom as described in claim 5, characterized in that, The positioning blocks include two parallel upper positioning blocks located on the inner wall of the arm tube and two right-angle positioning blocks located at the intersection of the left and lower side walls and the right and lower side walls of the outer wall of the arm tube, respectively. Each positioning block on the outer wall has a transition slope in the direction of the arm tube opening, and each positioning block on the inner wall has a transition slope in the direction of the arm tube tail.

7. A telescopic boom as described in any one of claims 1-6, characterized in that, The five-section arm includes: the first section arm, the second section arm, the third section arm, the fourth section arm, and the fifth section arm; The diameters of the first, second, third, fourth, and fifth arm sections decrease sequentially, and they are nested and slidably connected in sequence. The first arm section is in a fixed state, while the second, third, fourth, and fifth arm sections extend and retract synchronously. The telescopic mechanism includes: a drive assembly and a chain drive assembly; The drive assembly is a lead screw drive, a hydraulic cylinder, or an electric cylinder, used to drive the extension and retraction of the second arm within the first arm. The chain drive assembly employs a rope system to drive the telescopic movement of the third, fourth, and fifth arm sections, including: a third extension chain, a fourth extension chain, a fifth extension chain, a third retraction chain, a fourth retraction chain, and a fifth retraction chain; the third extension chain and the third retraction chain are respectively mounted on the third arm section to drive the telescopic movement of the third arm section within the second arm section; the fourth extension chain and the fourth retraction chain are respectively mounted on the fourth arm section to drive the telescopic movement of the fourth arm section within the third arm section; and the fifth extension chain and the fifth retraction chain are respectively mounted on the fifth arm section to drive the telescopic movement of the fifth arm section within the fourth arm section.

8. A method for adjusting a telescopic boom that prevents the boom tube from sagging and eliminates gaps during positioning, wherein the telescopic boom is the telescopic boom described in claim 5 or 6, characterized in that... The adjustment methods include: methods to prevent arm tube sagging and methods to eliminate positioning sway gaps; The method for preventing the boom tube from sagging is as follows: After the telescopic boom is fully extended, adjust the position of the tail pulley assembly and the mouth pulley assembly in all boom sections: When adjusting the position of the tail pulley assembly, the position of the tail pulley assembly is adjusted by the screw adjustment mechanism of the current arm section. During adjustment, tighten the screw adjustment mechanism to move the tail pulley assembly upward until the tail pulley assembly is pressed against the inner wall surface of the arm tube of the previous arm section. When adjusting the position of the opening pulley assembly, the lower pulley adjusting bolt is rotated to drive the pulley eccentric spindle to rotate. Due to the eccentricity of the pulley eccentric spindle, the rollers in the opening pulley assembly will move up and down accordingly, thereby generating a pre-elevation angle in the boom tube of the next stage boom. The size of the pre-elevation angle is determined according to the weight of the boom tube and the load, and is used to counteract the bending deformation of the telescopic boom under its own weight and load, thereby ensuring the straightness of the telescopic boom after it is deployed. The adjustment method for eliminating the gap during positioning is as follows: After the telescopic arm is extended to its final position, adjust the upper adjusting bolt, the upper lateral adjusting bolt, and the lower lateral adjusting bolt so that the guide slider at the opening of the upper-level arm section is in close contact with the positioning block on the outer wall surface of the current arm section, eliminating the gap between the guide slider at the opening of the upper-level arm section and the outer wall surface of the current arm section, thereby preventing structural swaying due to the gap between the arm sections in strong winds; at the same time, when the current arm section is extended to its final position, the positioning block inside the upper-level arm section contacts the tail pulley assembly of the current arm section, and adjusting the tail pulley assembly can eliminate the gap between the tail sections of the arm sections; the positioning block outside the current arm section contacts the opening pulley assembly and the opening guide slider of the upper-level arm section, and adjusting the opening pulley assembly and the opening guide block can eliminate the gap in the middle of the arm section.

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