Automatic locking adjustable high-bearing pull rod

Abstract

The invention relates to the technical field of aviation pull rods, in particular to an automatic locking adjustable high-bearing pull rod which comprises a rod body. The connecting mechanisms are used for connecting and fixing the pull rod, the connecting mechanisms are rotationally arranged at the two ends of the rod body, and the rotating axes of the connecting mechanisms coincide with the central axis of the rod body; when the rod body is rotated, the connecting mechanisms at the two ends of the rod body move oppositely or oppositely along the central axis of the rod body at the same time so as to adjust the length of the pull rod. The rotating and stretching locking mechanism is used for limiting the relative rotation between the rod body and the connecting mechanism when the pull rod rotates and is adjusted to the set length or the limit length; the rotating and stretching locking mechanism comprises rotating pieces fixedly arranged at the two ends of the rod body in a sleeving mode and limiting pieces fixed to the connecting mechanism and matched with the rotating pieces in a locking mode. According to the pull rod, threaded connection modes with different rotating directions are matched with a rotating and stretching locking mechanism composed of the tooth-shaped sleeve and the arc-shaped elastic piece, and the purposes of convenient and fast high-precision adjustment of the length of the pull rod and automatic locking are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation tie rods, and particularly to an automatically locking and adjustable high-load tie rod. Background Art

[0002] In the aviation field, tie rods are widely used in key parts such as flaps, landing gears, engine suspensions, luggage compartments, and mechanical control systems.

[0003] The existing tie rod structure is relatively simple, mostly consisting of ordinary straight rods with conventional connecting components. The common connection method is to directly weld or bolt the fixing seats at both ends of the rod body to connect with the relevant structures of the luggage compartment. To achieve a certain length adjustment function for some tie rods, multiple positioning holes are opened on the rod body, and the length is changed by inserting pins into different hole positions.

[0004] However, the length adjustment method of the existing tie rod is inconvenient to operate and the accuracy cannot meet the working condition requirements. For example, in different loading situations of the luggage compartment, it may be necessary to finely adjust the length of the tie rod to ensure the smooth opening and closing of the luggage compartment door and the stable storage of luggage. However, the adjustment method using positioning holes and pins not only takes a lot of time to operate, but also is difficult to achieve precise length adjustment. At the same time, the existing tie rod lacks a necessary self-locking structure to prevent the tie rod length from changing due to factors such as vibration during use, affecting the safe use of the luggage compartment. Summary of the Invention

[0005] To solve at least one of the above technical problems, the present invention proposes an automatically locking and adjustable high-load tie rod to solve the problems of inconvenient adjustment, high adjustment accuracy, and lack of automatic locking existing in the existing tie rod.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An automatically locking and adjustable high-load tie rod, comprising: A rod body; A connection mechanism for connecting and fixing the tie rod. The connection mechanism is rotatably arranged at both ends of the rod body, and the rotation axis of the connection mechanism coincides with the central axis of the rod body; when the rod body is rotated, the connection mechanisms at both ends of the rod body move towards or away from each other along the central axis of the rod body simultaneously to adjust the length of the tie rod; A rotation and extension locking mechanism for restricting the relative rotation between the rod body and the connection mechanism when the tie rod is rotated and adjusted to a set length or an extreme length; the rotation and extension locking mechanism includes rotating members sleeved and fixed at both ends of the rod body and limiting members fixed on the connection mechanism and locking and cooperating with the rotating members.

[0007] Preferably, the rotating member includes: Toothed sleeve, on the outer surface of which a number of teeth are arranged in a circular array; Limit block, arranged on the inner wall of the toothed sleeve. At both ends of the rod body, first limit grooves are provided along the central axis direction, and the limit block is clamped in the first limit groove to limit the circumferential rotation of the toothed sleeve relative to the rod body.

[0008] Preferably, the pull rod further includes a retaining ring for restricting the axial movement of the toothed sleeve along the rod body. The retaining ring is arranged on one side of the toothed sleeve close to the end of the rod body; second limit grooves are provided along the circumferential direction of both ends of the rod body, and the retaining ring is embedded in the second limit groove.

[0009] Preferably, the limiting member includes: Two arc-shaped elastic pieces, coaxially and symmetrically fixed on the connecting mechanism with the toothed sleeve. The arc-shaped elastic pieces are provided with inwardly concave portions adapted to the tooth grooves of the toothed sleeve along the central axis direction of the rod body. Under the elastic action of the arc-shaped elastic pieces towards the toothed sleeve, the concave portions are pressed into the tooth grooves to limit the rotation of the toothed sleeve relative to the connecting mechanism; A number of positioning pieces, fixedly arranged at both ends of the arc-shaped elastic piece and facing the inner side of the arc-shaped elastic piece to limit the axial movement of the toothed sleeve within the limiting area between the positioning pieces at both ends of the arc-shaped elastic piece.

[0010] Preferably, the arc-shaped elastic piece further includes a connecting piece for fixing the arc-shaped elastic piece on the connecting mechanism. One end of the connecting piece connected to the arc-shaped elastic piece is an arc concentric and of the same diameter as the arc-shaped elastic piece.

[0011] Preferably, the pull rod further includes an elastic auxiliary member for applying a pressure towards the radial direction of the toothed sleeve to the arc-shaped elastic piece, and at least part of the elastic auxiliary member is in contact with the arc-shaped elastic piece.

[0012] Preferably, the elastic auxiliary member is an elastic steel wire. The fixed end of the elastic steel wire is fixed to the connecting piece. The concave portion forms a groove on the surface of the arc-shaped elastic piece. The elastic steel wire is pressed in the groove under the elastic force and applies a pressure to the arc-shaped elastic piece to assist in the limiting and fixing of the concave portion of the arc-shaped elastic piece and the tooth groove.

[0013] Preferably, the rod body includes: First horizontal section; Tapered sections, symmetrically arranged at both ends of the first horizontal section. The large-mouth ends of the tapered sections are fixed to the horizontal section, and the central axis of the tapered sections coincides with the central axis of the first horizontal section; The second horizontal section, one end of which is coaxially fixed to the small-mouth end of the tapered section, and the other end is fixed to the connecting mechanism. The central axis of the second horizontal section coincides with the central axis of the tapered section and / or the first horizontal section.

[0014] Preferably, the connecting mechanism is a fork ear and / or a spherical plain bearing. The second horizontal sections located at both ends of the first horizontal section are provided with internal threads with different helix directions; The fork ear includes an ear seat, ear plates symmetrically arranged on the upper part of the ear seat, and a first threaded rod arranged on the lower part of the ear seat. The first threaded rod is threadedly connected to the second horizontal section, and the ear plates are correspondingly provided with pin holes and fixed by pin shafts; The spherical plain bearing includes an outer ring and an inner ring rotatably arranged inside the outer ring, and a second threaded rod that is smoothly connected along the radial direction of the outer ring and has an internal thread adapted to the internal thread of the second horizontal section.

[0015] Preferably, the rod body is hollow and made of aluminum alloy material, and both the telescopic locking mechanism and the connecting mechanism are made of stainless steel material.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the threaded connection method with different helix directions, when the rod body is rotated, the connecting mechanisms at both ends can move towards each other or away from each other, enabling the drawbar to conveniently adjust the length of the railing by rotating the rod body. At the same time, in cooperation with the telescopic locking mechanism composed of a toothed sleeve and an arc-shaped elastic piece arranged between the rod body and the connecting mechanism, the adjustment accuracy of the drawbar is controlled through the tooth pitch of the toothed sleeve. When the length of the drawbar is adjusted to the set length or the limit length, the arc-shaped elastic piece cooperates with the toothed sleeve to achieve automatic locking of the circumferential direction of the drawbar.

[0017] 2. By providing a concave portion on the arc-shaped elastic piece to fit with the tooth groove of the toothed sleeve, the rod body is in a fixed state when there is no circumferential rotational force or the circumferential rotational force is less than the minimum circumferential rotational force required to rotate the rod body. Thus, the purpose of automatic locking of the drawbar after adjustment is achieved.

[0018] 3. By providing a positioning piece, the toothed sleeve can be restricted to move within the restricted area of the two end positioning pieces, effectively preventing the operator from rotating the rod body excessively and causing damage to the railing. At the same time, compared with the positioning structure arranged inside the rod body, the visible positioning piece in this embodiment allows the operator to intuitively see whether the rod body has rotated to the limit position, that is, whether the drawbar has been adjusted to the limit length.

[0019] 4. In the present invention, an elastic steel wire is attached to the outer side of the arc-shaped elastic piece, and the elastic force of the elastic steel wire applies a certain pressure to the arc-shaped elastic piece to assist the rebound of the arc-shaped elastic piece, so as to make the fitting degree between the concave part and the tooth groove of the tooth-shaped sleeve better. Thus, during the use process, when subjected to external force vibration or impact, relative axial rotation between the arc-shaped elastic piece and the tooth-shaped sleeve will not occur, ensuring the stability of the length of the pull rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an automatic locking adjustable high-load pull rod (double fork ears); Figure 2 is a schematic structural diagram of an automatic locking adjustable high-load pull rod (fork ears and spherical plain bearing); Figure 3 is an exploded view of an automatic locking adjustable high-load pull rod; Figure 4 is Figure 3 the enlarged view at A in Figure 5 is a schematic structural diagram of the rod body in the present invention; Figure 6 is a three-dimensional view of the extension locking mechanism used in cooperation with the fork ears in the present invention; Figure 7 is a front view of the extension locking mechanism used in cooperation with the fork ears in the present invention; Figure 8 is a side view of the extension locking mechanism used in cooperation with the fork ears in the present invention; Figure 9 is a side view of the extension locking mechanism used in cooperation with the spherical plain bearing; Figure 10 is a three-dimensional view of the extension locking mechanism used in cooperation with the spherical plain bearing; Figure 11 is a side view of the usage state of the fork ears and the extension locking mechanism; Figure 12 is a three-dimensional view of the usage state of the fork ears and the extension locking mechanism; Figure 13 is a side view of the usage state of the spherical plain bearing and the extension locking mechanism; Figure 14 is a three-dimensional view of the usage state of the spherical plain bearing and the extension locking mechanism; In the figure: 10. Rod body; 101. First horizontal section; 102. Tapered section; 103. Second horizontal section; 1031. First limit groove; 1032. Second limit groove; 104. Retaining ring; 20. Connecting mechanism; 201. Fork ears; 2011. Ear seat; 2012. Ear plate; 2013. First threaded rod; 202. Spherical plain bearing; 2021. Bearing; 2022. Second threaded rod; 30. Telescopic locking mechanism; 301. Rotating member; 3011. Tooth-shaped sleeve; 30111. Teeth; 30112. Tooth grooves; 3012. Limit block; 302. Limiting member; 3021. Arc-shaped elastic piece; 30211. Concave pressing part; 30212. Groove; 3022. Positioning piece; 3023. Connecting piece; 40. Elastic steel wire. Detailed implementation manners

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention.

[0022] Please refer to Figures 1-14 As shown, an automatic locking and adjustable high-load pull rod includes: Rod body 10; Connecting mechanism 20 for connecting and fixing the pull rod. The connecting mechanism 20 is rotatably arranged at both ends of the rod body 10, and the rotation axis of the connecting mechanism 20 coincides with the central axis of the rod body 10; when the rod body 10 is rotated, the connecting mechanisms 20 at both ends of the rod body 10 move towards or away from each other along the central axis of the rod body 10 at the same time to adjust the length of the pull rod; Telescopic locking mechanism 30 for restricting the relative rotation between the rod body 10 and the connecting mechanism 20 when the pull rod is rotated and adjusted to a set length or an extreme length; the telescopic locking mechanism 30 includes a rotating member 301 sleeved and fixed at both ends of the rod body 10 and a limiting member 302 fixed on the connecting mechanism 20 and locked and cooperated with the rotating member 301.

[0023] In this embodiment, by providing a connecting structure at both ends of the rod body 10 and rotating the rod body 10 to adjust the length of the pull rod, the pull rod can meet the length adjustment requirements in the use scenario. At the same time, in cooperation with the telescopic locking mechanism 30, when the pull rod is adjusted to a set length or an extreme length, the rod body 10 and the connecting mechanism 20 are locked in a fixed position through the telescopic locking mechanism 30, avoiding the relative rotation of the rod body 10 when there is no rotational force, and improving the stability of the use of the pull rod and the convenience of adjustment.

[0024] It should be noted that, in order to improve the load-bearing capacity of the pull rod, the rod body 10 in this embodiment is hollow and made of aluminum alloy, and the telescopic locking mechanism 30 and the connecting mechanism 20 are both made of stainless steel.

[0025] Please refer to Figures 1-3 and Figure 5As shown in the figure, the above-mentioned rod body 10 includes: a first horizontal section 101; a tapered section 102 symmetrically arranged at both ends of the first horizontal section 101, the large-mouth end of the tapered section 102 is fixed to the horizontal section, and the central axis of the tapered section 102 coincides with the central axis of the first horizontal section 101; a second horizontal section 103, one end of which is coaxially fixed to the small-mouth end of the tapered section 102, and the other end is fixed to the connecting mechanism 20, and the central axis of the second horizontal section 103 coincides with the central axis of the tapered section 102 and / or the first horizontal section 101.

[0026] It should be noted that since the tie rod in the present invention is mainly applied to the aviation field, specifically mainly applied to flaps, landing gears, engine hangings, luggage compartments, mechanical control systems, etc. The above-mentioned usage scenarios all require the rod body 10 to have high load-bearing capacity and long service life.

[0027] Based on the above usage scenarios, the rod body 10 in this embodiment is generally composed of an equal-diameter hollow cylindrical tube and a variable-diameter conical tube. The rod body 10 adopting the above structure has at least the following advantages: Specifically, the design of the gradually changing diameter of the tapered section 102 can improve the stress concentration situation of the rod body 10. When the rod body 10 bears axial or bending loads, it can make the stress more evenly distributed on the rod body 10, reduce the risk of local damage due to stress concentration, and improve the service life of the rod body 10.

[0028] At the same time, whether the rod body 10 bears axial tension, pressure, or transverse shear force and bending moment, it can adapt to the change of the load through the change of the cross-section, so that the rod body 10 has good structural strength in multiple directions, and has strong versatility and stability.

[0029] In addition, compared with the rod body 10 with an equal diameter, under the premise of meeting certain strength requirements, the rod body 10 in this embodiment can appropriately reduce the use of materials through the above-mentioned rod body 10 structure, reduce the self-weight of the rod body 10, and at the same time ensure sufficient load-bearing capacity and improve the utilization efficiency of materials.

[0030] In order to further reduce the self-weight of the rod body 10, the above-mentioned rod body 10 in the present invention adopts a hollow structure.

[0031] In order to improve the load-bearing capacity of the overall tie rod, the rod body 10 in this embodiment is made of aluminum alloy, and the rotation and locking mechanism 30 and the connecting mechanism 20 are both made of stainless steel.

[0032] It can be understood that, in order to facilitate the operator to rotate the rod body 10, in this embodiment, the surface of the rod body 10 is provided with textures that increase the contact friction. Specifically, the knurling process can be adopted to roll patterns on the surface of the rod body 10, such as straight patterns, mesh patterns, etc. These patterns can increase the friction between the hand and the rod body 10, making it easier for the operator to apply force and less likely to slip when rotating the rod body 10.

[0033] Meanwhile, in order to facilitate gripping, in this embodiment, the first horizontal section 101 is provided with a gripping groove 30212 adapted to the hand. Specifically, according to the ergonomic principle, the shape and size that conform to the human hand gripping are designed, so that the hand of the operator can better fit the rod body 10, increasing the stability and comfort of gripping, and thus easily rotating the rod body 10.

[0034] Please refer to Figures 6-14 As shown, in this embodiment, the rod body 10 and the connecting mechanism 20 cooperate with the limiting member 302 through a toothed mechanism to realize the locking of the rotation position and the adjustment of the length of the pull rod.

[0035] Specifically, as Figure 5 and Figure 6 shown, the above-mentioned rotating member 301 includes: a toothed sleeve 3011, and a plurality of teeth 30111 are annularly arrayed on the outer surface of the toothed sleeve 3011; a limiting block 3012 is arranged on the inner wall of the toothed sleeve 3011, and first limiting grooves 1031 are provided at both ends of the rod body 10 along the central axis direction, and the limiting block 3012 is clamped in the first limiting grooves 1031 to limit the circumferential rotation of the toothed sleeve 3011 relative to the rod body 10.

[0036] In this embodiment, the above-mentioned limiting member 302 includes: Two arc-shaped elastic pieces 3021, which are coaxial with the toothed sleeve 3011 and symmetrically fixed on the connecting mechanism 20. The arc-shaped elastic pieces 3021 are provided with inwardly concave portions 30211 adapted to the tooth grooves 30112 of the toothed sleeve 3011 along the central axis direction of the rod body 10. Under the elastic action of the arc-shaped elastic pieces 3021 towards the toothed sleeve 3011, the concave portions 30211 are pressed into the tooth grooves 30112 to limit the rotation of the toothed sleeve 3011 relative to the connecting mechanism 20.

[0037] Specifically, in this embodiment, the connecting mechanisms 20 at both ends are fixed and do not rotate during use. The above-mentioned arc-shaped elastic pieces 3021 are fixedly arranged on the connecting mechanism 20 and remain fixed when the rod body 10 rotates; the toothed sleeve 3011 is fixed to the rod body 10, and when the rod body 10 rotates, the toothed sleeve 3011 rotates synchronously with the rod body 10.

[0038] Therefore, when the length of the pull rod needs to be adjusted, the operator needs to rotate the rod body 10. When the rod body 10 rotates, the teeth 30111 of the toothed sleeve 3011 will push open the concave portion 30211 in the tooth groove 30112, causing the concave portion 30211 of the elastic arc-shaped spring piece 3021 to move away from the central axis of the toothed sleeve 3011 along the side wall of the tooth 30111 until it reaches the tooth top. Under the action of the self-elastic recovery of the arc-shaped spring piece 3021, the concave portion 30211 moves closer to the central axis of the toothed sleeve 3011 along the side wall of the tooth 30111 until the concave portion 30211 is pressed into the tooth groove 30112 again.

[0039] Repeat this process until the length of the rod body 10 reaches the set length for use, and then the operator stops rotating. At this time, the concave portion 30211 fits with the tooth groove 30112, so that when there is no circumferential rotational force on the rod body 10 or the circumferential rotational force is less than the minimum circumferential rotational force that causes the rod body 10 to rotate, the rod body 10 is in a fixed state. Thus, the purpose of automatic locking of the pull rod after adjustment is achieved, and the convenience of use and adjustment of the pull rod is realized.

[0040] It should be noted that the teeth 30111 of the toothed sleeve 3011 generally include triangle, trapezoid, rectangle, involute, cycloid, etc. The usage characteristics and application scenarios of the above different tooth shapes belong to the prior art, and will not be elaborated in this application.

[0041] In this embodiment, triangular teeth 30111 are adopted. In order to ensure the smoothness of rotational adjustment, in this embodiment, the tooth top of the above teeth 30111 adopts a circular arc transition.

[0042] It can be understood that since the adjustment of the pull rod length is achieved by rotating the toothed sleeve 3011, the tooth pitch of the toothed sleeve 3011 has a direct impact on the accuracy and sensitivity of the pull rod length adjustment.

[0043] Specifically, a smaller tooth pitch means that within the same adjustment stroke, the toothed sleeve 3011 and the concave portion 30211 of the arc-shaped spring piece 3021 cooperate more times, and the adjustment is more precise. In scenarios where the length of the pull rod needs to be finely adjusted, a smaller tooth pitch can achieve more accurate adjustment and improve the adjustment accuracy. However, an overly small tooth pitch may cause a decrease in the strength of the teeth 30111 and is prone to damage under high load conditions. Although a larger tooth pitch can increase the strength of the teeth 30111, the adjustment sensitivity will decrease, and it is easy to over-adjust during the adjustment process, which also affects the adjustment accuracy. Therefore, in actual use, it is necessary to select an appropriate tooth pitch according to the usage scenario so that the accuracy and sensitivity of the pull rod adjustment meet the usage requirements.

[0044] Please refer to Figure 5As shown, in order to facilitate the positioning and installation of the limit block 3012, in this embodiment, a U-shaped first limit groove 1031 (through groove) is provided at one end of the second horizontal section 103. By providing the first limit groove 1031, it is not only convenient for the positioning and installation of the toothed sleeve 3011, but also can effectively limit the circumferential rotation of the toothed sleeve 3011 relative to the rod body 10.

[0045] Please refer to Figure 3 、 Figure 6 and Figure 10 As shown, in order to prevent the toothed sleeve 3011 from displacing along the axial direction, in this embodiment, a retaining ring 104 is provided on one side of the toothed sleeve 3011 close to the end of the rod body 10. At the same time, second limit grooves 1032 are provided along the circumferential direction of both ends of the rod body 10, and the retaining ring 104 is embedded in the second limit grooves 1032.

[0046] Specifically, in this embodiment, the retaining ring 104 is a C-shaped retaining ring 104, and the C-shaped retaining ring 104 can be made of materials such as 65MN, stainless steel, and carbon steel. Using the above materials with good elasticity and toughness can adapt to a certain degree of deformation and vibration while ensuring the fixing effect.

[0047] Please refer to Figure 6 、 Figure 7 、 Figure 10 and Figure 12 As shown, in this embodiment, the railing further includes a plurality of positioning pieces 3022, which are fixedly arranged at both ends of the arc-shaped elastic piece 3021 and face the inner side of the arc-shaped elastic piece 3021 to limit the axial movement of the toothed sleeve 3011 within the limit area between the positioning pieces 3022 at both ends of the arc-shaped elastic piece 3021.

[0048] It can be understood that the effective length of the limit area in this embodiment should be equal to the sum of the axial length of the toothed sleeve 3011 and the adjustment length of the pull rod. Specifically, in this embodiment, two positioning pieces 3022 are provided at one end of each arc-shaped elastic piece 3021, and are located on the inner wall of the arc-shaped elastic piece 3021. For the convenience of description, the positioning piece 3022 close to the connecting mechanism 20 is defined as the proximal positioning piece 3022, and the positioning piece 3022 far from the connecting mechanism 20 is defined as the distal positioning piece 3022. When the rod body 10 is rotated, the connecting mechanisms 20 at both ends will approach or move away from each other through the following thread connection methods with different helix directions between the rod body 10 and the connecting mechanism 20, so that the toothed sleeve 3011 approaches the proximal positioning piece 3022 or the distal positioning piece 3022, that is, the minimum adjustment length and the maximum adjustment length of the pull rod.

[0049] In this embodiment, by setting the positioning piece 3022, the toothed sleeve 3011 can be restricted to move within the restricted area of the two end positioning pieces 3022, effectively preventing the operator from over-rotating the rod body 10 and causing damage to the railing. At the same time, compared with the positioning structure arranged inside the rod body 10, the visible positioning piece 3022 in this embodiment allows the operator to directly see whether the rod body 10 has rotated to the limit position, that is, whether the pull rod has been adjusted to the limit length.

[0050] Please refer to Figure 6 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13 In order to facilitate the fixation of the arc-shaped elastic piece 3021, the arc-shaped elastic piece 3021 in this embodiment further includes a connecting piece 3023. The connecting piece 3023 is used to fix the arc-shaped elastic piece 3021 on the connecting mechanism 20. One end of the connecting piece 3023 connected to the arc-shaped elastic piece 3021 is an arc concentric and equal in diameter with the arc-shaped elastic piece 3021.

[0051] It should be noted that according to different usage scenarios, the connecting mechanism 20 in this embodiment can be a fork ear 201 and / or a spherical plain bearing 202.

[0052] Specifically, the fork ear 201 includes an ear seat 2011, ear plates 2012 symmetrically arranged on the upper part of the ear seat 2011, and a first threaded rod 2013 arranged on the lower part of the ear seat 2011. The first threaded rod 2013 is threadedly connected to the second horizontal section 103, and the ear plates 2012 are correspondingly provided with pin holes and fixed by pins.

[0053] The spherical plain bearing 202 includes a bearing 2021 composed of an outer ring and an inner ring rotatably arranged inside the outer ring, and a second threaded rod 2022 smoothly connected along the radial direction of the outer ring and having an internal thread adapted to the internal thread of the second horizontal section 103.

[0054] Since rotating the rod body 10 requires the fork ears 201 or the spherical plain bearings 202 at both ends to approach or move away from each other, the second horizontal sections 103 at both ends of the first horizontal section 101 are provided with internal threads with different helix directions (not shown in the figure) (right-handed threads and left-handed threads) in this embodiment.

[0055] Please refer to the figure. When the connecting mechanism 20 is a fork ear 201, the above-mentioned connecting piece 3023 can be a U-shaped structure. The bottom of the connecting piece 3023 is fixed to the ear seat 2011 by screws. At the same time, in order to avoid damage to the connecting piece 3023 caused by stress concentration, both the inner and outer sides of the corner section of the connecting piece 3023 are rounded.

[0056] When the connecting mechanism 20 is a spherical plain bearing 202, the above-mentioned connecting pieces 3023 can be fixedly installed on the smooth connecting section between the second threaded rod 2022 and the outer ring through screws respectively. At the same time, the connecting piece 3023 can include a horizontal section fixed to the spherical plain bearing 202 and a connecting section fixed to the arc-shaped elastic piece 3021, and the angle between the horizontal section and the connecting section is determined according to the height difference between the installation position of the connecting piece 3023 and the toothed sleeve 3011, so that the central axis of the arc-shaped elastic piece 3021 after fixed installation coincides with the central axis of the toothed sleeve 3011. Therefore, when the toothed sleeve 3011 rotates, the indentation part 30211 can be completely attached to the tooth groove 30112, ensuring the relative stability of the limit fixation.

[0057] Please refer to Figure 8 and Figure 11 As shown, in order to apply an auxiliary pressure to the arc-shaped elastic piece 3021 in the radial direction of the toothed sleeve 3011, the pull rod in this embodiment further includes an elastic auxiliary member, and at least part of the elastic auxiliary member is in contact with the arc-shaped elastic piece 3021.

[0058] It should be noted that, in order to facilitate the fitting with the arc-shaped elastic piece 3021, the elastic auxiliary member in this embodiment is an elastic steel wire 40. Specifically, the fixed end of the elastic steel wire 40 is fixed to the connecting piece 3023, and the indentation part 30211 forms a groove 30212 on the surface of the arc-shaped elastic piece 3021. The elastic steel wire 40 is pressed in the groove 30212 under the action of elastic force and applies pressure to the arc-shaped elastic piece 3021 to assist the indentation part 30211 of the arc-shaped elastic piece 3021 to be limit-fixed with the tooth groove 30112.

[0059] It can be understood that, in order to maximize the elastic pressure that the elastic steel wire 40 can provide to the arc-shaped elastic piece 3021 effectively, the above-mentioned elastic steel wire 40 should be set according to the specific shape of the connecting piece 3023.

[0060] Specifically, when the connecting mechanism 20 is a fork ear 201, two elastic steel wires 40 can be used, which are respectively attached and arranged in the groove 30212 of the arc-shaped elastic piece 3021. At the same time, the fixed ends of the elastic steel wires 40 can be wound into a C shape and flattened (as Figure 14 shown), so as to be fixed to the bottom of the connecting piece 3023 and the ear seat 2011 through screws. The shape of the elastic steel wire 40 should be similar to the shape of the U-shaped connecting piece 3023, so that at least the part of the elastic steel wire 40 located in the groove 30212 can be completely attached to it.

[0061] Similarly, when the connecting mechanism 20 is a spherical plain bearing 202, two elastic steel wires 40 are used and are respectively and conformably arranged in the grooves 30212 of the arc-shaped elastic piece 3021. At the same time, the fixed ends of the elastic steel wires 40 can be wound into a C shape and flattened to facilitate fixing to the outer ring or the smooth connecting section by screws. The shape of the elastic steel wires 40 should also be similar to the shape of the connecting piece 3023. At the same time, the contact part between the groove 30212 and the elastic steel wires 40 should be rounded so that at least the part of the elastic steel wires 40 located in the groove 30212 can be fully conformed to it.

[0062] In this embodiment, by conformably arranging the elastic steel wires 40 on the outer side of the arc-shaped elastic piece 3021, a certain pressure is applied to the arc-shaped elastic piece 3021 through the elastic force of the elastic steel wires 40 to assist the rebound of the arc-shaped elastic piece 3021, so that the fitting degree between the concave part 30211 and the tooth groove 30112 of the tooth-shaped sleeve 3011 is better. Thus, it is ensured that during use, when subjected to external force vibration or impact, there will be no relative axial rotation between the arc-shaped elastic piece 3021 and the tooth-shaped sleeve 3011, ensuring the stability of the length of the pull rod.

[0063] In the present invention, through the thread connection methods with different helix directions, when the rotating rod body 10 is rotated, the connecting mechanisms 20 at both ends can move towards each other or away from each other, so that the length of the pull rod can be adjusted by rotating the rod body 10. At the same time, cooperating with the rotation and extension locking mechanism 30 composed of the tooth-shaped sleeve 3011 and the arc-shaped elastic piece 3021 arranged between the rod body 10 and the connecting mechanism 20, the adjustment precision of the pull rod is controlled through the tooth pitch of the tooth-shaped sleeve 3011. When the length of the pull rod is adjusted to the set length or the limit length, the circumferential automatic locking of the pull rod is realized through the cooperation between the concave part 30211 of the arc-shaped elastic piece 3021 and the tooth groove 30112 of the tooth-shaped sleeve 3011.

[0064] The above is the specific implementation manner of the embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. An automatic locking adjustable high-load pull rod, characterized in that Comprising: A rod body (10); A connecting mechanism (20) for connecting and fixing the drawbar. The connecting mechanism (20) is rotatably arranged at both ends of the rod body (10), and the rotation axis of the connecting mechanism (20) coincides with the central axis of the rod body (10); when the rod body (10) is rotated, the connecting mechanisms (20) at both ends of the rod body (10) move towards each other or away from each other along the central axis of the rod body (10) simultaneously to adjust the length of the drawbar; A telescopic locking mechanism (30) for restricting the relative rotation between the rod body (10) and the connecting mechanism (20) when the drawbar is rotated and adjusted to a set length or an extreme length; the telescopic locking mechanism (30) includes rotating members (301) sleeved and fixed at both ends of the rod body (10) and limiting members (302) fixed on the connecting mechanism (20) and locking and cooperating with the rotating members (301).

2. The automatically locking and adjustable high-load pull rod according to claim 1, wherein The rotating member (301) includes: A toothed sleeve (3011), and a plurality of teeth (30111) are annularly arrayed on the outer surface of the toothed sleeve (3011); A limiting block (3012) is arranged on the inner wall of the toothed sleeve (3011). First limiting grooves (1031) are arranged at both ends of the rod body (10) along the central axis direction, and the limiting block (3012) is clamped in the first limiting grooves (1031) to limit the circumferential rotation of the toothed sleeve (3011) relative to the rod body (10).

3. The automatically locking and adjustable high-load pull rod according to claim 2, wherein, The drawbar further includes a retaining ring (104) for restricting the axial movement of the toothed sleeve (3011) along the rod body (10). The retaining ring (104) is arranged on one side of the toothed sleeve (3011) close to the end of the rod body (10); second limiting grooves (1032) are arranged at both ends of the rod body (10) along the circumferential direction of the rod body (10), and the retaining ring (104) is embedded in the second limiting grooves (1032).

4. The automatically locking and adjustable high-load pull rod according to claim 2, wherein, The limiting member (302) includes: Two arc-shaped elastic pieces (3021), which are coaxial with the toothed sleeve (3011) and symmetrically fixed on the connecting mechanism (20). The arc-shaped elastic pieces (3021) are provided with inward pressing concave parts (30211) adapted to the tooth grooves (30112) of the toothed sleeve (3011) along the central axis direction of the rod body (10). Under the elastic action of the arc-shaped elastic pieces (3021) towards the toothed sleeve (3011), the pressing concave parts (30211) are pressed into the tooth grooves (30112) to limit the rotation of the toothed sleeve (3011) relative to the connecting mechanism (20); A plurality of positioning pieces (3022) are fixedly arranged at both ends of the arc-shaped elastic pieces (3021) and face the inner sides of the arc-shaped elastic pieces (3021) to limit the axial movement of the toothed sleeve (3011) within the limiting area between the positioning pieces (3022) at both ends of the arc-shaped elastic pieces (3021).

5. The automatically locking and adjustable high-load pull rod according to claim 4, characterized in that, The arc-shaped elastic piece (3021) further includes a connecting piece (3023). The connecting piece (3023) is used to fix the arc-shaped elastic piece (3021) on the connecting mechanism (20). One end of the connecting piece (3023) connected to the arc-shaped elastic piece (3021) is an arc concentric and equal in diameter with the arc-shaped elastic piece (3021).

6. The automatically locking and adjustable high-load pull rod according to claim 4, wherein, The pull rod further includes an elastic auxiliary member for applying a pressure radially toward the toothed sleeve (3011) to the arc-shaped elastic piece (3021). At least part of the elastic auxiliary member is in contact with the arc-shaped elastic piece (3021).

7. The automatically locking and adjustable high-load pull rod according to claim 6, characterized in that, The elastic auxiliary member is an elastic steel wire (40). The fixed end of the elastic steel wire (40) is fixed to the connecting piece (3023). The indentation part (30211) forms a groove (30212) on the surface of the arc-shaped elastic piece (3021). The elastic steel wire (40) is pressed in the groove (30212) under the action of elastic force and applies a pressure to the arc-shaped elastic piece (3021) to assist in the limit fixation of the indentation part (30211) of the arc-shaped elastic piece (3021) and the tooth groove (30112).

8. The automatically locking and adjustable high-load pull rod according to any one of claims 1-7, characterized in that, The rod body (10) includes: A first horizontal section (101); Tapered sections (102) symmetrically arranged at both ends of the first horizontal section (101). The large-mouth ends of the tapered sections (102) are fixed to the first horizontal section (101). The central axis of the tapered sections (102) coincides with the central axis of the first horizontal section (101); A second horizontal section (103) with one end coaxially fixed to the small-mouth end of the tapered section (102) and the other end fixed to the connecting mechanism (20). The central axis of the second horizontal section (103) coincides with the central axis of the tapered section (102) and / or the first horizontal section (101).

9. The automatically locking and adjustable high-load pull rod according to claim 8, characterized in that, The connecting mechanism (20) is a fork ear (201) and / or a spherical plain bearing (202). The second horizontal sections (103) located at both ends of the first horizontal section (101) are provided with internal threads with different helix directions; The fork ear (201) includes an ear seat (2011), ear plates (2012) symmetrically arranged on the upper part of the ear seat (2011), and a first threaded rod (2013) arranged on the lower part of the ear seat (2011). The first threaded rod (2013) is threadedly connected to the second horizontal section (103), and pin holes are correspondingly provided in the ear plates (2012) and fixed by pin shafts; The spherical plain bearing (202) includes an outer ring and an inner ring rotatably arranged inside the outer ring to form a bearing (2021) and a second threaded rod (2022) smoothly connected along the radial direction of the outer ring and having an internal thread adapted to the second horizontal section (103).

10. The automatically locking and adjustable high-load pull rod according to claim 8, wherein The rod body (10) is hollow and made of aluminum alloy. The telescopic locking mechanism (30) and the connecting mechanism (20) are both made of stainless steel.

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