Ladder truck guide rail positioning device and ladder truck guide rail installation method

Abstract

The present invention relates to a ladder vehicle guide rail positioning device and a ladder vehicle guide rail installation method, wherein the ladder vehicle comprises a multi-section ladder frame (10) and a multi-section guide rail (20), the ladder frame (10) comprises a slideway (11) and an upper chord rod (12), the guide rail (20) is installed on the upper chord rod (12), the ladder vehicle guide rail positioning device comprises a bracket (40), a first positioning member (50) and a second positioning member (60), the first positioning member (50) and the second positioning member (60) are both installed on the bracket (40), the first positioning member (50) is used to cooperate with the slideway (11) and position the bracket (40) through the cooperation of the first positioning member (50) and the slideway (11), and the second positioning member (60) is used to cooperate with the guide rail (20) and position the installation of the guide rail (20) through the cooperation of the second positioning member (60) and the guide rail (20). The positioning device of the present invention can position the installation of the guide rail and improve the installation accuracy of the guide rail.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a ladder truck guide rail positioning device and a ladder truck guide rail installation method. Background Art

[0002] A ladder truck is a ladder fire truck with a special chassis, a lifting truss arm, and professional operators. It can transport firefighters to a certain height and realize high-altitude rescue or firefighting operations. The ladder truck includes a ladder frame, a slide, a guide rail, and a lifting pulley. Multiple ladders constitute the truss arm of the ladder fire truck, and the slide is the running track of each arm of the ladder truck's truss arm during the extension and retraction process. The guide rail is installed on the upper chord of the ladder frame. The guide rail is a long thin angle steel and is the running track of the lifting pulley when it is working. The lifting pulley runs on the top of the truss arm of the ladder truck and is used to raise and lower the manned platform during rapid rescue.

[0003] Whether the lifting pulley of the ladder fire truck can run smoothly depends mainly on the welding quality of the guide rails. Since the guide rails are long and thin angle steels with large deflection, it is difficult to ensure the width between the left and right guide rails and the height of each side guide rail during manual welding. It is also difficult to ensure that the height of the guide rails on each ladder frame is the same, especially it is impossible to ensure that the guide rails will not tilt during welding.

[0004] If the width between the left and right rails cannot be guaranteed, the guide wheels of the lifting pulley may be stuck by the rails on both sides, causing jamming or even failure to operate; if the height of the rails on each side cannot be guaranteed, the surface of the rails will be uneven; if the height of the rails on each ladder frame cannot be guaranteed, the lifting pulley will vibrate significantly when it moves from the previous ladder frame to the next ladder frame, and may even cause the lifting pulley to detach from the rails at the transition between the two ladder frames and fail to operate normally; if the rails are tilted during welding, the guide wheels will always be in contact with the rails during operation, which may cause excessive wear of the guide wheels and reduce the service life of the lifting pulley. Therefore, it is an important prerequisite for the smooth operation of the lifting pulley to ensure that the rails do not tilt after welding, and at the same time ensure that the width and height of the rails on both sides and the height of the rails on each ladder frame meet the design requirements.

[0005] At present, in the prior art, when installing the guide rails, the upper chord of each ladder frame is generally used as the positioning reference. When the guide rails are welded, the upper surface of the upper chord is pre-marked to determine the lateral size of the single-sided guide rail relative to the corresponding upper chord, and then the guide rails are manually straightened and welded in sections.

[0006] This solution, which uses only the upper chord on one side as the positioning reference during the welding of the guide rails, is easily affected by the upper chord, and cannot guarantee the width and height of the left and right guide rails of a single ladder frame, nor can it determine the relative spatial position of the guide rails, nor can it determine the relative spatial position of the guide rails between the ladder frames. The specific analysis is as follows:

[0007] (1) The width dimension between the guide rails on both sides of the ladder frame cannot be guaranteed: the position of the upper chord in space will produce local deformation as the welding heat input increases, and the spatial position dimension of the upper chord will eventually deviate from the theoretical dimension. If the guide rail is installed based on the upper chord as the reference, the error will continue to accumulate;

[0008] (2) The height of the guide rails on both sides of the ladder frame cannot be guaranteed: Due to the limitation of the ladder frame structure, the upper chord rod is supported by sections. After the ladder frame is welded, the upper chord rod will form different degrees of wave deformation, resulting in an uneven upper surface of the upper chord rod. If the guide rail is installed based on the upper surface of the upper chord rod, it will inevitably lead to an uneven upper surface of the guide rail.

[0009] (3) The height dimension of the guide rails between the ladder frames cannot be guaranteed: the height dimension between the upper chord and the slideway inevitably has different deviations along the axial direction of the ladder frame. Therefore, after the assembly of the ladder frames, the different extension lengths of the ladder frames will lead to inconsistent heights of the guide rails between the ladder frames. If the guide rails are installed based on the upper chord as the reference positioning, there will also be a problem of inconsistent heights of the guide rails between the ladder frames.

[0010] It should be noted that the information disclosed in the background technology section of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0011] The embodiment of the present invention provides a ladder truck guide rail positioning device and a ladder truck guide rail installation method, which are used to position the guide rail when installing the guide rail and improve the installation accuracy of the guide rail.

[0012] According to one aspect of the present invention, a guide rail positioning device for a ladder truck is provided. The ladder truck comprises a multi-section ladder frame and a multi-section guide rail. The ladder frame comprises a slideway and an upper chord rod. The guide rail is mounted on the upper chord rod. The guide rail positioning device for the ladder truck comprises:

[0013] Bracket;

[0014] A first positioning member, mounted on the bracket, used to cooperate with the slideway and position the bracket through the cooperation between the first positioning member and the slideway; and

[0015] The second positioning member is installed on the bracket and is used to cooperate with the guide rail and position the installation of the guide rail through the cooperation between the second positioning member and the guide rail.

[0016] In some embodiments, the ladder truck guide rail positioning device further includes a first mounting plate, the first mounting plate is mounted on the bottom side of the bracket, and the first positioning member is mounted on the first mounting plate.

[0017] In some embodiments, the ladder truck guide rail positioning device further includes a second mounting plate, the second mounting plate is mounted on the top side of the bracket, and the second positioning member is mounted on the second mounting plate.

[0018] In some embodiments, the first positioning member includes a first roller.

[0019] In some embodiments, the second positioning member includes a second roller and a boss disposed on the second roller, the boss extending radially outward from an outer surface of the second roller, and the boss is used to abut against the guide rail.

[0020] In some embodiments, the axes of the first roller and the second roller are parallel to each other.

[0021] In some embodiments, the bracket is in the shape of a rectangular parallelepiped, and the ladder truck guide rail positioning device includes four first positioning members and four second positioning members, the four first positioning members are respectively arranged on the four corners of the bottom of the bracket, and the four second positioning members are respectively arranged on the four corners of the top of the bracket.

[0022] In some embodiments, the bracket includes a bracket body and an inclined rod connected to a diagonal line of the bracket body.

[0023] According to another aspect of the present invention, a method for installing a ladder truck guide rail based on the above-mentioned ladder truck guide rail positioning device is provided, comprising:

[0024] Provide ladder truck guide rail positioning device;

[0025] The first positioning member is matched with the slideway, and the bracket is positioned by the matching of the first positioning member and the slideway;

[0026] Matching the second positioning member with the guide rail, and positioning the guide rail through the matching of the second positioning member and the guide rail; and

[0027] After the position of the guide rail is determined, connect the guide rail and the upper chord.

[0028] In some embodiments, the ladder truck guide rail installation method further includes:

[0029] Providing a plurality of ladder rail positioning devices, wherein the widths of the brackets of the plurality of ladder rail positioning devices correspond to the widths of the slideways on both sides of the multi-section ladder frame; and

[0030] The guide rails are installed one by one on the upper chord rods of the corresponding ladder frame through the ladder truck guide rail positioning device.

[0031] Based on the above technical solution, an embodiment of the present invention provides a guide rail positioning device for a ladder truck, the positioning device includes a bracket, a first positioning member and a second positioning member. The first positioning member can be positioned by the cooperation between the first positioning member and the slideway of the ladder truck. After the position of the first positioning member is determined, the positions of the bracket and the second positioning member can also be determined, and then the guide rail can be positioned by the cooperation between the second positioning member and the guide rail. The positioning device uses the slideway of the ladder truck as a positioning reference. When installing the guide rail, the guide rail is positioned by the positioning device, which can effectively ensure the installation accuracy of the guide rail, and then ensure the stability of the trolley of the ladder truck running on the guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 The present invention is a schematic structural diagram of a ladder truck using a ladder truck guide rail positioning device according to an embodiment of the present invention to install a guide rail.

[0034] Figure 2 A schematic diagram of the partial structure of a ladder truck using a ladder truck guide rail positioning device according to an embodiment of the present invention to install the guide rail.

[0035] Figure 3 The present invention is a schematic structural diagram of a ladder frame of a ladder truck using a guide rail positioning device for a ladder truck according to an embodiment of the present invention to install a guide rail.

[0036] Figure 4 for Figure 3 Left view of .

[0037] Figure 5 The figure is a schematic diagram of the matching structure of an embodiment of the ladder truck guide rail positioning device of the present invention and the guide rail.

[0038] Figure 6 for Figure 5 Left view of .

[0039] In the figure:

[0040] 10. Ladder frame; 11. Slideway; 12. Upper chord rod; 13. Side rod;

[0041] 20. Guide rail; 30. Pulley;

[0042] 40. bracket; 41. bracket body; 42. diagonal rod;

[0043] 50. first positioning member; 51. first roller;

[0044] 60. second positioning member; 61. second roller; 62. boss;

[0045] 70. First mounting plate; 80. Second mounting plate. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0048] In order to solve the problem of poor guide rail installation accuracy in the prior art solution of installing the guide rail using the upper chord as the positioning reference, the present invention provides a ladder truck guide rail positioning device, by which the guide rail can be positioned when installing the guide rail to ensure the installation accuracy of the guide rail and improve the stability and safety of the pulley running on the guide rail.

[0049] like Figure 1 As shown, the ladder truck to which the ladder truck guide rail positioning device embodiment provided by the present invention is applicable includes a multi-section ladder frame 10 and a multi-section guide rail 20. The ladder frame 10 includes a slide 11 and an upper chord 12. Two adjacent ladder frames 10 can move relative to each other along the slide 11 to achieve the extension and retraction of the truss arm composed of the multi-section ladder frames 10. The guide rail 20 is installed on the upper chord 12.

[0050] like Figure 2 As shown, the ladder truck also includes a pulley 30, which moves along the guide rail 20. The multiple ladder frames 10 are connected end to end to form a retractable truss arm. When the truss arm is extended, the pulley 30 can move along the guide rail 20 to the farthest end of the truss arm to send people to a high place. The pulley 30 can also return to the ground along the guide rail 20; when the truss arm is retracted, it is convenient for transfer and transportation. Among two adjacent ladder frames 10, the next ladder frame 10 can move along the slide 11 relative to the previous ladder frame 10, and the extension and retraction of the truss arm can be achieved by the movement between the two adjacent ladder frames 10 along the slide 11.

[0051] like Figure 3As shown, the ladder frame 10 includes a slide 11, an upper chord 12 and a side rod 13. The side rod 13 is connected between the slide 11 and the upper chord 12. A plurality of cross rods and reinforcing rods are also connected between the slides 11 on both sides to form a boom structure to improve the overall structural strength of the boom.

[0052] The slideways 11 on both sides are arranged in parallel, the upper chord rods 12 on both sides are arranged in parallel, and the slideways 11 and the upper chord rods 12 are also arranged in parallel. A plurality of side rods 13 are arranged obliquely relative to the slideways 11 and the upper chord rods 12. The slideways 11, the upper chord rods 12 and the side rods 13 can all be hollow structures to reduce the weight of the ladder frame 10.

[0053] like Figure 4 As shown, the cross section of the slideway 11 is C-shaped, and the cross section of the guide rail 20 is inverted L-shaped. Figure 1 It can be seen that in this embodiment, the aerial ladder truck includes 6 ladder frames 10, and the guide rails 20 installed on two adjacent ladder frames 10 are arranged relatively to each other, that is, the lateral parts of the two guide rails 20 extend relative to each other, so that they can cooperate with the T-shaped bosses on the roller sides provided on the pulley 30, and the pulley 30 can be limited when the pulley 30 transitions between the two ladder frames 10 to prevent the pulley 30 from derailing, thereby ensuring the safety of the operation of the pulley 30.

[0054] refer to Figure 5 and Figure 6 As shown, in some embodiments of the ladder truck guide rail positioning device provided by the present invention, the positioning device includes a bracket 40, a first positioning member 50 and a second positioning member 60, the first positioning member 50 and the second positioning member 60 are both installed on the bracket 40, the first positioning member 50 is used to cooperate with the slide 11 and position the bracket 40 through the cooperation between the first positioning member 50 and the slide 11, and the second positioning member 60 is used to cooperate with the guide rail 20 and position the installation of the guide rail 20 through the cooperation between the second positioning member 60 and the guide rail 20.

[0055] In the above embodiment, the positioning device includes a bracket 40, a first positioning member 50 and a second positioning member 60. The first positioning member 50 can be positioned by the cooperation between the first positioning member 50 and the slideway 11 of the ladder truck. After the position of the first positioning member 50 is determined, the positions of the bracket 40 and the second positioning member 60 can also be determined, and then the guide rail 20 can be positioned by the cooperation between the second positioning member 60 and the guide rail 20. The positioning device uses the slideway 11 of the ladder truck as a positioning reference. When the guide rail 20 is installed, the positioning device is used to position the guide rail 20, which can effectively ensure the installation accuracy of the guide rail, and then ensure the stability of the trolley of the ladder truck running on the guide rail.

[0056] In order to smoothly realize the extension and retraction of each section of the ladder frame 10, the slideways 11 on both sides of the ladder frame 10 are set more accurately. Therefore, using the slideways 11 as the installation reference of the guide rails 20 can greatly improve the installation accuracy of the guide rails 20 and avoid the installation error of the upper chord rod 12, thermal deformation and other factors that affect the installation of the guide rails 20.

[0057] The positioning device uses the slide 11 of the ladder frame 10 as a positioning reference, and can effectively ensure the width of the guide rails 20 on both sides through the second positioning member 60, and will not make the width of the guide rails 20 impossible to ensure due to the change in the spatial position of the upper chord rod 12 caused by the welding deformation of the ladder frame 10.

[0058] On the positioning device, the heights of the first positioning member 50 and the second positioning member 60 are fixed. By using the positioning device with the slide 11 of the ladder frame 10 as the positioning reference and positioning the upper end surface of the guide rail 20 by the second positioning member 60, the heights of the guide rails 20 on both sides can be ensured to be consistent, and the height dimension will not be affected by the wave deformation of the upper chord 12.

[0059] The positioning device uses the slideway 11 of the ladder frame 10 as a positioning reference, and also uses the telescopic slideway 11 as a reference when installing to the next ladder frame 10. Therefore, it can also ensure that the spatial position of the guide rails 20 on the two adjacent ladder frames 10 is accurate, and the interchangeability between the ladder frames 10 is good.

[0060] In some embodiments, the ladder truck guide rail positioning device further includes a first mounting plate 70 , the first mounting plate 70 is mounted on the bottom side of the bracket 40 , and the first positioning member 50 is mounted on the first mounting plate 70 .

[0061] The first mounting plate 70 can be provided to facilitate the installation of the first positioning member 50. The first mounting plate 70 can be fixedly mounted on the bracket 40 by bolts.

[0062] In some embodiments, the ladder truck guide rail positioning device further includes a second mounting plate 80 , the second mounting plate 80 is mounted on the top side of the bracket 40 , and the second positioning member 60 is mounted on the second mounting plate 80 .

[0063] The second mounting plate 80 can be provided to facilitate the installation of the second positioning member 60. The second mounting plate 80 can be fixedly mounted on the bracket 40 by bolts.

[0064] In some embodiments, the first positioning member 50 includes a first roller 51, and the first roller 51 is rotatably mounted on the first mounting plate 70. The first roller 51 is used as the first positioning member 50 to facilitate the movement of the first positioning member 50 relative to the slideway 11 and reduce the movement resistance. By rolling the first positioning member 50 relative to the slideway 11, the length requirement of the bracket 40 can be reduced. When installing the guide rail 20, the bracket 40 can be welded in sections. After a section is welded, the bracket 40 is pushed to slide along the slideway 11 of the ladder frame 10 to the next section for welding again until the guide rail 20 on the entire ladder frame 10 is installed.

[0065] In some embodiments, the second positioning member 60 includes a second roller 61 and a boss 62 disposed on the second roller 61, the boss 62 extending radially outward from the outer surface of the second roller 61, and the boss 62 is used to abut against the guide rail 20. The second roller 61 is rotatably mounted on the second mounting plate 80, the boss 62 is fixedly mounted on the second roller 61 or is integrally formed with the second roller 61, and the boss 62 rotates with the second roller 61. Using the second roller 61 as the second positioning member 60 can facilitate the movement of the second positioning member 60 relative to the slide 11 and reduce the movement resistance. By rolling the second positioning member 60 relative to the slide 11, the length requirement of the bracket 40 can also be reduced.

[0066] In some embodiments, the axes of the first roller 51 and the second roller 61 are parallel to each other.

[0067] like Figure 6 As shown, the first roller 51 and the second roller 61 are both disposed on the outside of the bracket 40 and arranged horizontally. The first roller 51 can be embedded in the C-shaped opening of the slide 11, the second roller 61 abuts against the lateral side of the L-shaped guide rail 20, and the side of the boss 62 abuts against the vertical side of the L-shaped guide rail 20.

[0068] The first roller 51 and the second roller 61 can be made of steel, plastic, or nylon by machining.

[0069] In some embodiments, the bracket 40 is in a rectangular parallelepiped shape. This structural form is easy to assemble and has good structural strength and is not easy to deform.

[0070] In some embodiments, the ladder truck guide rail positioning device includes four first positioning members 50 and four second positioning members 60 . The four first positioning members 50 are respectively arranged at the four corners of the bottom of the bracket 40 , and the four second positioning members 60 are respectively arranged at the four corners of the top of the bracket 40 .

[0071] The four first positioning members 50 and the four second positioning members 60 are all arranged horizontally.

[0072] In some embodiments, the bracket 40 includes a bracket body 41 and an inclined rod 42 connected to the diagonal line of the bracket body 41. By providing the inclined rod 42, the structural strength of the bracket body 41 can be improved.

[0073] In some embodiments, the bracket 40 is formed by connecting hollow tubes to reduce the overall weight of the bracket 40. For example, the bracket 40 can be welded from square steel tubes, rectangular steel tubes, angle steels, channel steels, and steel plates.

[0074] In some embodiments, a first gasket is provided between the first mounting plate 70 and the first roller 51; and / or a second gasket is provided between the second mounting plate 80 and the second roller 61. By providing the first gasket or the second gasket between the roller and the mounting plate, the installation positions of the first roller 51 and the second roller 61 can be fine-tuned to compensate for the matching problems caused by manufacturing errors and assembly errors.

[0075] Through the description of multiple embodiments of the guide rail positioning device for a ladder truck of the present invention, it can be seen that in the embodiment of the guide rail positioning device for a ladder truck of the present invention, each ladder frame 10 is in a nested structure, the assembly and movement of the next ladder frame 10 are completely based on the slideway 11 of the previous ladder frame 10, and the height position of the upper chord 12 of each ladder frame 10 in space is completely dependent on the height of the slideway 11 of the previous ladder frame 10. The guide rail positioning device for a ladder truck positions the guide rail 20 based on the slideway 11, and uses the slideways 11 of each single ladder frame 10 as the positioning reference, and completes the installation of the guide rail 20 above the upper chord 12 on both sides by segment welding. Under the condition of ensuring the height size of the slideway 11 of each ladder frame 10, the installation of the guide rail 20 on each ladder frame 10 is based on the same positioning reference, so the spatial position of the guide rail 20 is relatively determined, the width and height of the guide rails 20 on both sides can be kept fixed, and there will be no height misalignment between the guide rails 20 and the guide rails 20 on two adjacent ladder frames 10.

[0076] Based on the ladder truck guide rail positioning device in each of the above embodiments, the present invention also proposes a ladder truck guide rail installation method, which includes:

[0077] Provide ladder truck guide rail positioning device;

[0078] The first positioning member 50 is matched with the slideway 11, and the bracket 40 is positioned by the matching of the first positioning member 50 and the slideway 11;

[0079] The second positioning member 60 is matched with the guide rail 20, and the guide rail 20 is positioned by the matching of the second positioning member 60 and the guide rail 20; and

[0080] After the position of the guide rail 20 is determined, the guide rail 20 and the upper chord rod 12 are connected.

[0081] In some embodiments, the ladder truck guide rail installation method further includes:

[0082] Providing a plurality of ladder rail positioning devices, wherein the widths of the brackets 40 of the plurality of ladder rail positioning devices correspond to the widths of the slideways 11 on both sides of the multi-section ladder frame 10; and

[0083] The guide rails 20 are installed one by one on the upper chords 12 of the corresponding ladder frames 10 through the ladder truck guide rail positioning device.

[0084] By providing a plurality of positioning devices with different widths, they can respectively correspond to ladder frames with different widths, thereby realizing the guide rail installation of the entire truss arm.

[0085] The positive technical effects of the ladder truck guide rail positioning device in the above-mentioned embodiments are also applicable to the ladder truck guide rail installation method, which will not be described in detail here.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A guide rail positioning device for a ladder truck, the ladder truck comprising a multi-section ladder frame (10) and a multi-section guide rail (20), the ladder frame (10) comprising a slideway (11) and an upper chord rod (12), the guide rail (20) being mounted on the upper chord rod (12), It is characterized in that The ladder vehicle guide rail positioning device comprises: Bracket (40); A first positioning member (50) is mounted on the bracket (40) and is used to cooperate with the slideway (11) and position the bracket (40) through the cooperation between the first positioning member (50) and the slideway (11); and A second positioning member (60) is mounted on the bracket (40) and is used to cooperate with the guide rail (20) and position the installation of the guide rail (20) through the cooperation between the second positioning member (60) and the guide rail (20).

2. The ladder truck guide rail positioning device according to claim 1, It is characterized in that It also includes a first mounting plate (70), wherein the first mounting plate (70) is mounted on the bottom side of the bracket (40), and the first positioning member (50) is mounted on the first mounting plate (70).

3. The ladder truck guide rail positioning device according to claim 1, It is characterized in that It also includes a second mounting plate (80), wherein the second mounting plate (80) is mounted on the top side of the bracket (40), and the second positioning member (60) is mounted on the second mounting plate (80).

4. The ladder truck guide rail positioning device according to claim 1, It is characterized in that The first positioning member (50) comprises a first roller (51).

5. The ladder truck guide rail positioning device according to claim 4, It is characterized in that The second positioning member (60) comprises a second roller (61) and a boss (62) arranged on the second roller (61), wherein the boss (62) extends radially outward from the outer surface of the second roller (61), and the boss (62) is used to abut against the guide rail (20).

6. The ladder truck guide rail positioning device according to claim 5, It is characterized in that The axes of the first roller (51) and the second roller (61) are parallel to each other.

7. The ladder truck guide rail positioning device according to claim 1, It is characterized in that The bracket (40) is in a rectangular parallelepiped shape, and the ladder truck guide rail positioning device comprises four first positioning members (50) and four second positioning members (60), the four first positioning members (50) are respectively arranged at four corners of the bottom of the bracket (40), and the four second positioning members (60) are respectively arranged at four corners of the top of the bracket (40).

8. The ladder truck guide rail positioning device according to claim 7, It is characterized in that The bracket (40) comprises a bracket body (41) and an inclined rod (42) connected to a diagonal line of the bracket body (41).

9. A method for installing a ladder truck guide rail based on the ladder truck guide rail positioning device according to any one of claims 1 to 8, It is characterized in that include: Providing the ladder truck guide rail positioning device; The first positioning member (50) is matched with the slideway (11), and the bracket (40) is positioned by the matching of the first positioning member (50) and the slideway (11); The second positioning member (60) is matched with the guide rail (20), and the guide rail (20) is positioned by the matching of the second positioning member (60) and the guide rail (20); and After the position of the guide rail (20) is determined, the guide rail (20) and the upper chord rod (12) are connected.

10. The method for installing a ladder truck guide rail according to claim 9, It is characterized in that Also includes: Providing a plurality of said ladder truck guide rail positioning devices, wherein the widths of said brackets (40) of said plurality of ladder truck guide rail positioning devices correspond one to one with the widths of said slideways (11) on both sides of said multi-section ladder rack (10); and The guide rails (20) are installed one by one on the upper chord rods (12) of the corresponding ladder frames (10) through the ladder truck guide rail positioning device.

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