Welding tool and welding method for ladder assembly

Abstract

The invention provides a welding tool and a welding method for a ladder assembly. The welding tool comprises a rack, a plurality of bar positioning and clamping mechanisms and prefabricated deflection cushion blocks. The positioning and clamping mechanism is arranged on the rack and comprises a clamping structure and a positioning structure, the positioning structure is used for positioning the ladder assembly, and the clamping structure can move relative to the positioning structure so as to clamp the ladder assembly. And the prefabricated deflection cushion block is arranged between the positioning structure and the ladder assembly and is used for presetting a deflection for the ladder assembly.

Description

Technical Field

[0001] The present application relates to the field of fire truck equipment, and in particular to a welding tooling and a welding method for a ladder frame of a fire truck. Background Art

[0002] Aerial ladder fire trucks are used for firefighters to climb high to fight fires in high-rise buildings, tall facilities, oil tanks, etc., rescue trapped people, rescue valuable materials, and complete other rescue tasks. There is a telescopic aerial ladder on the vehicle, which can be equipped with a lifting bucket turntable and a fire extinguishing device for firefighters to climb high to fight fires and rescue trapped people, and is suitable for fighting fires in high-rise buildings. In actual use, if the ladder frame is welded and processed in a straight shape, when the aerial ladder is fully extended, it will be affected by bending stresses such as gravity and torsion and bend downward, increasing the risk factor of the overall aerial ladder.

[0003] Therefore, in the welding of the aerial ladder, in order to overcome the bending deformation of the extended end of the aerial ladder, after the overall production of the ladder frame is completed, the aerial ladder frame is not straight, but in a reverse bending (precast deflection) state, so as to ensure that the ladder frame can resist the actual bending deformation when it is fully straightened. In actual welding, due to the long length of the ladder frame, the bending deformation amount of the ladder frame is uncontrollable, resulting in the welded ladder frame not meeting the design requirements; in addition, the welding tooling has a complex structure, cumbersome operation, large occupied space, and high cost. Summary of the Invention

[0004] The main purpose of the present application is to provide a welding tooling with a simple structure, easy operation, controllable bending deformation amount of the ladder frame, and high precision.

[0005] Another main purpose of the present application is to provide a welding method with a controllable bending deformation amount of the ladder frame, high precision, and easy operation.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, there is provided a welding tooling for a ladder frame, including a frame, a positioning and clamping mechanism, and a precast deflection pad. The positioning and clamping mechanism is arranged on the frame. The positioning and clamping mechanism includes a clamping structure and a positioning structure. The positioning structure is used to position the ladder frame, and the clamping structure can move relative to the positioning structure to clamp the ladder frame. The precast deflection pad is arranged between the positioning structure and the ladder frame for presetting a deflection for the ladder frame.

[0008] According to one embodiment of the present application, the positioning and clamping mechanism has a clamping groove. The clamping structure is arranged in the clamping groove and can move along the clamping groove, and the positioning structure is arranged at the end of the clamping groove far from the clamping structure.

[0009] According to one embodiment of the present application, the positioning and clamping mechanism further includes a clamping rod, which is arranged in the clamping groove and connected to the clamping structure, and the clamping rod drives the clamping structure to move.

[0010] According to one embodiment of the present application, the positioning structure is provided with a threaded hole. The clamping rod includes a threaded section and a connecting section connected to each other. The connecting section is connected to the clamping structure; the threaded section can rotate in the threaded hole to enable the clamping rod to drive the clamping structure to move.

[0011] According to one embodiment of the present application, the outer wall of the connecting section has a first annular groove, and balls are arranged in the first annular groove. The connecting section is connected to the clamping structure through the balls.

[0012] According to one embodiment of the present application, the clamping structure includes a clamping block and a clamping seat connected to each other. The clamping seat has a blind hole, and at least part of the connecting section extends into the blind hole. The inner wall of the blind hole has a second annular groove, and the balls are arranged in the second annular groove. The balls are connected to the clamping seat through the second annular groove.

[0013] According to one embodiment of the present application, the first annular groove and the second annular groove are communicated and form an annular groove with a circular cross-section, and the balls can freely roll in the annular groove.

[0014] According to one embodiment of the present application, the positioning and clamping mechanism further includes a pressing structure for pressing the ladder frame, and the clamping structure is arranged between the positioning structure and the pressing structure.

[0015] According to one embodiment of the present application, define the direction in which the clamping structure moves relative to the positioning structure as the first direction. The dimension of the precast deflection pad in the first direction is the thickness, then the thicknesses of the precast deflection pads are not completely the same.

[0016] According to one embodiment of the present application, the positioning and clamping mechanisms are arranged at intervals on the frame, and the positioning structures are located on the same side of the frame.

[0017] According to another aspect of the present application, the present application further provides a welding method for a ladder frame, which uses the above-mentioned welding tooling for the ladder frame. The welding method includes:

[0018] Step S1: Set the preset deflection of the ladder frame;

[0019] Step S2: Judge the correctness of the preset deflection;

[0020] Step S3: If it is correct, calculate the size of each of the prefabricated deflection pads according to the preset deflection, position and clamp the ladder frame on the welding fixture and then perform welding; if it is incorrect, repeat Step S1 and Step S2.

[0021] According to one embodiment of the present application, define the direction in which the clamping structure moves relative to the positioning structure as the first direction, and the length direction of the ladder frame as the second direction. The first direction is perpendicular to the second direction, and the dimension of the prefabricated deflection pad in the first direction is the thickness; then the thickness of the prefabricated deflection pad gradually increases from the center of the ladder frame to both ends along the second direction, and the difference between the thickness of the prefabricated deflection pads provided at the two outermost ends of the ladder frame and the thickness of the prefabricated deflection pad provided at the center of the ladder frame is equal to the value of the preset deflection of the ladder frame.

[0022] As can be seen from the above technical solutions, the advantages and positive effects of the welding fixture for the ladder frame proposed in the present application are as follows:

[0023] The welding fixture for the ladder frame proposed in the present application includes a positioning and clamping mechanism and prefabricated deflection pads. The prefabricated deflection pads are arranged on the positioning and clamping mechanism to preset a deflection for the ladder frame, so that the amount of reverse bending deformation (prefabricated deflection) of the ladder frame is controllable, and the welded ladder frame can meet the design requirements. Different prefabricated deflection pads can be arranged at different positions of the ladder frame, so that the reverse bending deformation accuracy of the ladder frame is high.

[0024] The welding fixture for the ladder frame proposed in the present application clamps the ladder frame to be welded through the cooperation of the positioning structure and the clamping structure on the positioning and clamping mechanism, and at the same time realizes presetting a deflection by cooperating with the prefabricated deflection pads arranged between the positioning structure and the ladder frame. The whole welding fixture has a simple structure, is easy to operate, occupies a small space and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By considering the following detailed description of the preferred embodiments of the present application in conjunction with the drawings, various objectives, features and advantages of the present application will become more obvious. The drawings are only exemplary illustrations of the present application and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0026] Figure 1 is a schematic diagram of the assembly of the ladder frame and the welding fixture of the present application.

[0027] Figure 2 is a schematic diagram of the structure of the welding fixture for the ladder frame of the present application.

[0028] Figure 3 is a schematic diagram of the structure of the frame of the welding fixture of the present application (the middle cover plate and the side cover plate are not shown).

[0029] Figure 4It is the left view of the welding tooling of the present application (showing the ladder frame).

[0030] Figure 5 It is the schematic structural diagram of the positioning and clamping mechanism of the welding tooling of the present application.

[0031] Figure 6 It is Figure 5 the enlarged view of part I in

[0032] Figure 7 It is Figure 5 the front view of the positioning and clamping mechanism of the welding tooling of the present application.

[0033] Figure 8 It is Figure 7 the sectional view taken along the A-A direction of

[0034] Figure 9 It is Figure 8 the enlarged view of part II in

[0035] Figure 10 the enlarged schematic diagram of the welding tooling (partial) of the present application.

[0036] Figure 11 It is the enlarged schematic diagram of the welding tooling of the present application with the ladder frame (partial) installed.

[0037] Figure 12 It is the schematic principle diagram of the welding method of the present application.

[0038] The description of the reference numerals is as follows:

[0039] 1 - Welding tooling;

[0040] 2 - Ladder frame;

[0041] 10 - Frame;

[0042] 20 - Positioning and clamping mechanism;

[0043] 30 - Prefabricated deflection pad;

[0044] 100 - Support block;

[0045] 101 - Support foot;

[0046] 102 - Intermediate cover plate;

[0047] 103 - Side cover plate;

[0048] 104 - Mounting seat;

[0049] 200 - Annular groove;

[0050] 201 - Clamping structure;

[0051] 202 - Positioning structure;

[0052] 203 - Compression structure;

[0053] 204 - Clamping groove;

[0054] 205 - Clamping rod;

[0055] 206 - Bottom plate;

[0056] 207 - Handle;

[0057] 2011 - Clamping block;

[0058] 2012 - Clamping seat;

[0059] 2013 - Blind hole;

[0060] 2014 - Second annular groove;

[0061] 2015 - Through hole;

[0062] 2021 - Threaded hole;

[0063] 2022 - Positioning block;

[0064] 2023 - Flange;

[0065] 2031 - Pressure plate;

[0066] 2032 - Pressure seat;

[0067] 2051 - Threaded section;

[0068] 2052 - Connection section;

[0069] 2053 - First annular groove;

[0070] 2054 - Ball;

[0071] 2055 - Plug;

[0072] 2061 - Left guide bar;

[0073] 2062 - Right guide bar;

[0074] 2063 - T-shaped groove;

[0075] D1 - First direction;

[0076] D2 - Second direction;

[0077] ΔP - Preset deflection;

[0078] Δ2 - Actual deviation;

[0079] S' - Spatial position coordinates of the extended end of the reverse bending ladder after loading;

[0080] Spatial position coordinates of the unloaded extended end of the R-inverted ladder rack;

[0081] Spatial position coordinates of the unloaded extended end of the straight ladder rack;

[0082] Spatial position coordinates of the extended end of the straight ladder rack after loading. Detailed implementation manners

[0083] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted.

[0084] In the following description of different exemplary embodiments of the present application, reference is made to the accompanying drawings which form a part of the present application, and in which are shown, by way of example, different exemplary structures, systems and steps that can implement various aspects of the present application. It should be understood that other specific solutions of components, structures, exemplary devices, systems and steps can be used and structural and functional modifications can be made without departing from the scope of the present application. Moreover, although terms such as "above", "between", "inside" etc. may be used in this specification to describe different exemplary features and elements of the present application, these terms are used herein for convenience only, for example, according to the directions of the examples described in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present application.

[0085] It can be understood that the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products or devices.

[0086] Relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to encompass different orientations of the device in addition to the orientations shown in the figures. For example, if the device in one of the figures is flipped, the element described as "lower" or "bottom" of other elements will be oriented "upper" or "top" of other elements. Thus, the exemplary term "lower" may include the orientations of "lower" and "upper", and the term "bottom" may include the orientations of "bottom" and "top", depending on the specific orientation of the figure. Similarly, if the device in one of the figures is flipped, the element described as "lower" or "bottom" of other elements will be oriented as "upper" or "top" of other elements. Thus, the exemplary terms "bottom" or "below" may include the orientations of upper and lower.

[0087] Refer to Figure 1 , Figure 2 and Figure 4 , the welding tooling 1 for the ladder 2 of the present application includes a frame 10, a positioning and clamping mechanism 20, and a prefabricated deflection cushion block 30. The positioning and clamping mechanism 20 is arranged on the frame 10. The positioning and clamping mechanism 20 includes a clamping structure 201 and a positioning structure 202. The positioning structure 202 is used to position the ladder 2, and the clamping structure 201 can move relative to the positioning structure 202 to clamp the ladder 2. The prefabricated deflection cushion block 30 is arranged between the positioning structure 202 and the ladder 2 for presetting a deflection for the ladder 2.

[0088] The welding tooling 1 for the ladder 2 of the present application includes a positioning and clamping mechanism 20 and a prefabricated deflection cushion block 30. The prefabricated deflection cushion block 30 is arranged on the positioning and clamping mechanism 20 to preset a deflection for the ladder 2, so that the amount of reverse bending deformation (prefabricated deflection) of the ladder 2 is controllable, and the welded ladder 2 can meet the design requirements. Different prefabricated deflection cushion blocks 30 can be arranged on the welding tooling 1 corresponding to different positions of the ladder 2, so that the reverse bending deformation accuracy of the ladder 2 is high.

[0089] The welding tooling 1 for the ladder 2 of the present application clamps the ladder 2 to be welded through the mutual cooperation of the positioning structure 202 and the clamping structure 201 on the positioning and clamping mechanism 20. At the same time, with the use of the prefabricated deflection cushion block 30 arranged between the positioning structure 202 and the ladder 2, the whole welding tooling 1 has a simple structure, is easy to operate, and occupies a small space.

[0090] Among them, the positioning and clamping mechanisms 20 are arranged at intervals on the frame 10, and the positioning structures 202 are located on the same side of the frame 10.

[0091] See Figure 2 and Figure 3, the frame 10 of the welding tooling 1 for the ladder rack 2 of the present application is a frame structure, including support feet 101 and mounting seats 104. The mounting seats 104 are used to fix the positioning and clamping mechanism 20, and the positioning and clamping mechanism 20 can be fixed to the mounting seats 104 by threads. The mounting seats 104 are arranged at intervals, an intermediate cover plate 102 is arranged between the mounting seats, and side cover plates 103 are arranged at the edges of the frame structure. The positioning and clamping mechanism 20 corresponds to the mounting seats 104. The support feet 101 can support the entire welding tooling 1 on the ground.

[0092] As Figure 4 and Figure 5 shown, in this embodiment, the positioning and clamping mechanism 20 of the present application has a clamping groove 204. The clamping structure 201 is arranged in the clamping groove 204 and can move along the clamping groove 204. The positioning structure 202 is arranged at the end of the clamping groove 204 far from the clamping structure 201. The setting of the clamping groove 204 provides space for the movement of the clamping structure 201 and can ensure the flatness of the ladder rack 2 installed on the positioning and clamping mechanism 20.

[0093] In this embodiment, the positioning and clamping mechanism 20 further includes a bottom plate 206, and the clamping groove 204 is arranged on the bottom plate 206. Along the direction of the clamping groove 204 on the bottom plate 206, a left guide bar 2061 and a right guide bar 2062 are arranged on both sides of the clamping groove 204. The left guide bar 2061, the right guide bar 2062 and the bottom plate 206 form a T-shaped groove 2063. Figure 5 Only a part of the right guide bar 2062 in

[0094] is shown, and the whole of the left guide bar 2061 is shown. In the actual product, both the right guide bar 2062 and the left guide bar 2061 are complete. The design of the T-shaped groove 2063 enables the positioning and clamping mechanism 20 to adapt to ladder racks 2 of different widths.

[0095] In this embodiment, referring to Figure 4 , one side of the ladder rack 2 is clamped by the clamping structure 201 and the prefabricated deflection cushion block 30, and the other side is pressed by the pressing structure 203. A plurality of support blocks 100 with different shapes and sizes are arranged on the positioning and clamping mechanism 20 for supporting the ladder rack 2 or supporting the pressing plate 2031.

[0096] In this embodiment, the positioning and clamping mechanism 20 further includes a clamping rod 205. The clamping rod 205 is disposed in the clamping groove 204 and is connected to the clamping structure 201. The clamping rod 205 drives the clamping structure 201 to move. The driving of the clamping structure 201 by the clamping rod 205 has a simple structure, the moving distance of the clamping structure 201 is controllable, and the accuracy is high.

[0097] In this embodiment, a handle 207 is provided at the end of the clamping rod 205 protruding from the positioning structure 202 for rotating the clamping rod 205. The handle 207 facilitates the operation of the staff.

[0098] As Figure 6 shown, in this embodiment, the outer wall of the connecting section 2052 has a first annular groove 2053, and a ball 2054 is disposed in the first annular groove 2053. The connecting section 2052 is connected to the clamping structure 201 through the ball 2054. The rotation of the clamping rod 205 can drive the clamping structure 201 to move. Driving the clamping structure 201 to move through the ball 2054 can reduce friction, reduce damage, and extend the service life of the positioning and clamping mechanism 20.

[0099] In this embodiment, the clamping structure 201 includes a clamping block 2011 and a clamping seat 2012 that are connected to each other. The clamping seat 2012 has a blind hole 2013, and at least a part of the connecting section 2052 extends into the blind hole 2013.

[0100] In this embodiment, referring to Figure 5 、 Figure 7 and Figure 8 , the positioning structure 202 is provided with a threaded hole 2021. The clamping rod 205 includes a threaded section 2051 and a connecting section 2052 that are connected to each other. The connecting section 2052 is connected to the clamping structure 201; the threaded section 2051 can rotate in the threaded hole 2021 to enable the clamping rod 205 to drive the clamping structure 201 to move. The threaded section 2051 on the clamping rod 205 can rotate in the threaded hole 2021 of the positioning structure 202, and the clamping structure 201 can be driven to move along the clamping groove 204 by the rotation of the clamping rod 205.

[0101] In this embodiment, referring to Figure 8 , the positioning structure 202 includes a positioning block 2022 and a flange 2023. The positioning block 2022 is used to position the ladder 2, and the flange 2023 is disposed on the side of the positioning block 2022 facing away from the clamping structure 201. The threaded hole 2021 is disposed on the flange 2023. The arrangement of the threaded hole 2021 on the flange 2023 can ensure the strength and accuracy of the positioning block 2022, which is beneficial to improving the accuracy of the preset deflection of the ladder 2 after welding.

[0102] In this embodiment, referring to Figure 6 and Figure 9, the inner wall of the blind hole 2013 has a second annular groove 2014, and the ball 2054 is arranged in the second annular groove 2014. The ball 2054 is connected to the clamping seat 2012 through the second annular groove 2014. The ball 2054 can roll in the second annular groove 2014.

[0103] The first annular groove 2053 and the second annular groove 2014 communicate with each other and form an annular groove 200 with a circular cross-section. The ball 2054 can freely roll in the annular groove 200. The cross-section of the first annular groove 2053 is semi-circular, and the cross-section of the second annular groove 2014 is semi-circular. In this way, the force exerted by the first annular groove 2053 on the ball 2054 can be transmitted to the second annular groove 2014 through the ball 2054, so that the clamping rod 205 can drive the clamping seat 2012 to move.

[0104] In this embodiment, a through hole 2015 is provided on the clamping seat 2012. The through hole 2015 communicates with the second annular groove 2014, and the diameter of the through hole 2015 is larger than the diameter of the ball 2054. The through hole 2015 provided on the clamping seat 2012 is mainly used for installing and replacing the ball 2054. In the positioning and clamping mechanism 20, mainly by rotating the clamping rod 205, the clamping seat 2012 is driven to move through the ball 2054. During the installation process, the connecting section 2052 of the clamping rod 205 needs to be installed into the blind hole 2013 of the clamping seat 2012 first, and then the ball 2054 is placed into the through hole 2015 of the clamping seat 2012. After the ball 2054 is installed, the through hole 2015 can be plugged with a plug 2055 to prevent the ball 2054 from falling out.

[0105] In this embodiment, refer to Figure 5 、 Figure 10 and Figure 11 , define the direction in which the clamping structure 201 moves relative to the positioning structure 202 as the first direction D1. The dimension of the precast deflection pad 30 in the first direction D1 is the thickness. Then the thicknesses of the plurality of precast deflection pads 30 are not completely the same. In this embodiment, the thicknesses of the precast deflection pads 30 used at both ends of the ladder frame 2 are greater than the thicknesses of the precast deflection pads 30 used in the middle of the ladder frame 2. In this way, the finally welded ladder frame 2 presents a state of protruding in the middle and sinking at both ends. In actual use, it can avoid bending downward under load and ensure fire safety.

[0106] There is also a second implementation manner for the welding tooling 1 of the ladder frame 2 of the present application. The welding tooling 1 of the ladder frame 2 in this second implementation manner has a substantially the same structure as that of the welding tooling 1 of the ladder frame 2 in Figures 1 to 11 the implementation manner. Therefore, in the following description of the welding tooling 1 of the ladder frame 2 in this second implementation manner, the description will not be repeated. Figures 1 to 11The structures described in the embodiments of Figures 1 to 11 The same reference numerals are used to label the structures that are the same as those of the welding fixture 1 for the ladder 2 described in the embodiments of Figures 1 to 11 Therefore, in the following description of the present embodiment, the differences from the welding fixture 1 for the ladder 2 in the embodiments of

[0107] There is also a third embodiment of the welding fixture 1 for the ladder 2 of the present application. The welding fixture 1 for the ladder 2 in this third embodiment has substantially the same structure in the basic configuration as Figures 1 to 11 the welding fixture 1 for the ladder 2 in the embodiments of Figures 1 to 11 The structures described in the embodiments of Figures 1 to 11 Therefore, in the following description of the present embodiment, the differences from the welding fixture 1 for the ladder 2 in the embodiments of Figures 1 to 11 the welding fixture 1 for the ladder 2 are mainly described. Among them, for the welding fixture 1 for the ladder 2 in this third embodiment, the positioning structure 202 of the positioning and clamping mechanism 20 and the setting position of the threaded hole 2021 of the positioning structure 202 are different. In this third embodiment, the positioning structure 202 includes the part of the bottom plate 206 at the end of the clamping groove 204 and the positioning block 2022. The positioning block 2022 is used to position the ladder 2, and the threaded hole 2021 is provided in the part of the bottom plate 206 at the end of the clamping groove 204.

[0108] The above is a detailed description of several exemplary embodiments of the welding fixture 1 for the ladder 2 proposed in the present application. Next, a detailed description of the welding method for the ladder 2 proposed in the present application will be given.

[0109] Referring to Figures 1 to 11 , the present application also proposes a welding method for the ladder 2. The welding fixture 1 used in the welding method is the above welding fixture 1. The welding method includes: Step S1: Set the preset deflection of the ladder 2; Step S2: Judge the correctness of the preset deflection; Step S3: If it is correct, calculate the size of each prefabricated deflection pad 30 according to the preset deflection, position and clamp the ladder 2 on the welding fixture 1 and then perform welding; if it is incorrect, repeat Steps S1 and S2.

[0110] The welding method of the ladder rack 2 of the present application sets the preset deflection of the ladder rack 2, verifies the correctness of the preset deflection through relevant calculations, and adjusts the size of the prefabricated deflection cushion block 30 of the welding tooling 1 of the ladder rack 2 according to the correct preset deflection to ensure the reverse bending amount of the ladder rack 2 after welding.

[0111] In this embodiment, the direction in which the clamping structure 201 moves relative to the positioning structure 202 is defined as the first direction D1, the length direction of the ladder rack 2 is the second direction D2, the first direction D1 is perpendicular to the second direction D2, and the dimension of the prefabricated deflection cushion block 30 in the first direction D1 is the thickness; then the thickness of the prefabricated deflection cushion block 30 gradually increases from the center of the ladder rack 2 to both ends along the second direction D2. In this way, the finally welded ladder rack 2 presents a state of convexity in the middle and sinking at both ends. In actual use, it can avoid bending downward under load and ensure fire safety.

[0112] In this embodiment, along the second direction D2, the difference between the thickness of the prefabricated deflection cushion block 30 arranged at the two outermost ends of the ladder rack 2 and the thickness of the prefabricated deflection cushion block 30 arranged at the center of the ladder rack 2 is equal to the value of the preset deflection of the ladder rack 2. In this way, a preset deflection can be set for the ladder rack 2 through prefabricated deflection cushion blocks 30 with different thicknesses, and the deformation amount caused by the bucket gravity and bending moment during the operation of the ladder rack 2 can be overcome.

[0113] In this embodiment, along the second direction D2, no prefabricated deflection cushion block 30 is arranged at the center of the ladder rack 2, and the thickness of the prefabricated deflection cushion block 30 arranged at the two outermost ends of the ladder rack 2 is equal to the value of the preset deflection of the ladder rack 2. In this way, the number of prefabricated deflection cushion blocks 30 can be reduced, which is beneficial to cost reduction.

[0114] In this embodiment, refer to Figure 12 , Figure 12 shows the principle of step S2 in the welding method of the present application, which includes: setting the ideal spatial position coordinate P0 of the extended end of the ladder rack 2, extracting the spatial position coordinate S' of the extended end of the reverse-bent ladder rack 2 with a preset deflection of ΔP after being loaded, and calculating the component Δ1 of the dimensional deviation between P0 and S' in the directions of Δ2, ΔP, and ΔD shown in Figure 12 . Extract the spatial position coordinate R of the unloaded extended end of the reverse-bent ladder rack 2 with a preset deflection, and calculate the difference ΔD between R and S'; extract the spatial position coordinate P of the unloaded extended end of the straight ladder rack 2 without a preset deflection. Then the preset deflection ΔP needs to satisfy: R1 = P1 - ΔP and Δ2 = ΔP - ΔD; if the actual deviation |Δ2| is less than Δ1, the preset deflection is correct. Where Δ2, ΔP, and ΔD are all quantities in the directions shown in Figure 12 , R1 is the component of R in the directions of Δ2, ΔP, and ΔD shown in Figure 12 , and P1 is the component of P in the directions of Δ2, ΔP, and ΔD shown in Figure 12 .

[0115] In practice, the spatial position coordinates P of the unloaded extended end of the straight ladder frame 2 without preset deflection can be used as the ideal spatial position coordinates P0 of the extended end of the ladder frame 2 for calculation.

[0116] After the ladder frame 2 is welded, stress relief, shot blasting, sand blasting, heat treatment and other processes are required, and then overall assembly and debugging are carried out until the requirements are met, then painting is carried out, and finally the overall debugging and assembly link is entered.

[0117] In summary, the welding tooling for the ladder frame proposed in this application includes a positioning and clamping mechanism and a prefabricated deflection pad. The prefabricated deflection pad is arranged on the positioning and clamping mechanism to preset a deflection for the ladder frame, so that the reverse bending deformation amount (prefabricated deflection) of the ladder frame is controllable, and the welded ladder frame can meet the design requirements. The positioning structure and the clamping structure on the positioning and clamping mechanism cooperate with each other to clamp the ladder frame to be welded. At the same time, the prefabricated deflection pad arranged between the matching positioning structure and the ladder frame, the whole welding tooling has a simple structure and is easy to operate. Different prefabricated deflection pads can be set at different positions of the ladder frame, so that the reverse bending deformation accuracy of the ladder frame is high.

[0118] The welding method of the ladder frame of this application sets the preset deflection of the ladder frame, verifies the correctness of the preset deflection through relevant calculations, and adjusts the size of the prefabricated deflection pad of the welding tooling of the ladder frame according to the correct preset deflection to ensure the reverse bending amount of the welded ladder frame.

[0119] It can be understood that the various embodiments / implementation manners provided in this application can be combined with each other without conflict, and no further examples will be given here.

[0120] In the above exemplary embodiment, the welding tooling for the ladder frame proposed in this application is described by taking its application to a fire truck as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of this application to other types of devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments, and these changes are still within the scope of the principle of the welding tooling for the ladder frame proposed in this application.

[0121] It should be noted here that the welding tooling for the ladder frame shown in the drawings and described in this specification is only a few examples of the many welding toolings for the ladder frame that can adopt the principle of this application. It should be clearly understood that the principle of this application is by no means limited to any details or any components of the welding tooling for the ladder frame shown in the drawings or described in this specification.

[0122] In the embodiments of the application, the terms "first", "second", "third" are for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "plural" means two or more unless otherwise clearly defined. Terms such as "installed", "connected", "coupled", "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "coupled" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to specific circumstances.

[0123] In the description of the embodiments of the application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the application.

[0124] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the application. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "one" and "the above" etc. are used to indicate the existence of one or more elements / components / etc. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0125] The above are only the preferred embodiments of the embodiments of the application and are not used to limit the embodiments of the application. For those skilled in the art, the embodiments of the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application shall be included in the protection scope of the embodiments of the application.

Claims

1. A welding tooling for ladders, characterized in that, Comprising: Frame; Positioning and clamping mechanism, arranged on the frame, the positioning and clamping mechanism includes a clamping structure and a positioning structure, the positioning structure is used for positioning the ladder frame, and the clamping structure can move relative to the positioning structure to clamp the ladder frame; Prefabricated deflection pad, arranged between the positioning structure and the ladder frame, used to preset a deflection for the ladder frame.

2. The welding tooling for the ladder rack according to claim 1, characterized in that, The positioning and clamping mechanism has a clamping groove, the clamping structure is arranged in the clamping groove and can move along the clamping groove, and the positioning structure is arranged at the end of the clamping groove far from the clamping structure.

3. The welding tooling for the ladder rack according to claim 2, characterized in that The positioning and clamping mechanism further includes a clamping rod, the clamping rod is arranged in the clamping groove and is connected to the clamping structure, and the clamping rod drives the clamping structure to move.

4. The welding tooling for the ladder bracket according to claim 3, characterized in that, The positioning structure is provided with a threaded hole, the clamping rod includes a threaded section and a connecting section connected to each other, the connecting section is connected to the clamping structure; the threaded section can rotate in the threaded hole to realize the clamping rod driving the clamping structure to move.

5. The welding tooling for the ladder rack according to claim 4, characterized in that, The outer wall of the connecting section has a first annular groove, and balls are arranged in the first annular groove, and the connecting section is connected to the clamping structure through the balls.

6. The welding tooling for the ladder rack according to claim 5, characterized in that, The clamping structure includes a clamping block and a clamping seat connected to each other, the clamping seat has a blind hole, at least part of the connecting section extends into the blind hole, the inner wall of the blind hole has a second annular groove, and the balls are arranged in the second annular groove, and the balls are connected to the clamping seat through the second annular groove.

7. The welding tooling for the ladder rack according to claim 6, characterized in that The first annular groove and the second annular groove are communicated and form an annular groove with a circular cross-section, and the balls can freely roll in the annular groove.

8. The welding tooling for the ladder rack according to claim 1, characterized in that, The positioning and clamping mechanism further includes a pressing structure, the pressing structure is used to press the ladder frame, and the clamping structure is arranged between the positioning structure and the pressing structure.

9. The welding tooling for the ladder rack according to claim 1, characterized in that Define the direction in which the clamping structure moves relative to the positioning structure as the first direction, and the dimension of the prefabricated deflection pad in the first direction is the thickness, then the thicknesses of the prefabricated deflection pads are not completely the same.

10. The welding tooling for the ladder rack according to claim 1, characterized in that, The positioning and clamping mechanisms are arranged on the frame at intervals, and the positioning structures are located on the same side of the frame.

11. A welding method for a ladder rack, characterized in that, Using the welding tooling for the ladder frame according to any one of claims 1-10, the welding method includes: Step S1: Set the preset deflection of the ladder frame; Step S2: Judge the correctness of the preset deflection; Step S3: If it is correct, calculate the dimensions of each prefabricated deflection pad according to the preset deflection, position and clamp the ladder frame on the welding tooling and then perform welding; if it is incorrect, repeat Step S1 and Step S2.

12. The welding method for the ladder frame according to claim 11, characterized in that Define the direction in which the clamping structure moves relative to the positioning structure as the first direction, the length direction of the ladder frame as the second direction, the first direction is perpendicular to the second direction, and the dimension of the prefabricated deflection pad in the first direction is the thickness; Then the thickness of the precast deflection pad gradually increases from the center of the ladder to both ends along the second direction, and the difference between the thickness of the precast deflection pad arranged at the two outermost ends of the ladder and the thickness of the precast deflection pad arranged at the center of the ladder is equal to the preset deflection value of the ladder.

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