A positioning device for welding a steel frame of a lifting platform

Abstract

The application discloses a positioning device for welding of a lifting platform support steel frame, relates to the technical field of lifting platforms, and comprises a welding pre-positioning mechanism and a positioning support installed on the outer side of the welding pre-positioning mechanism. The outer side of the welding pre-positioning mechanism is provided with a welding mechanism, and the outer side of the welding mechanism is symmetrically provided with lifting supports. The welding pre-positioning mechanism comprises an ejection support, the top and bottom of the ejection support are symmetrically provided with support fixing frames, the inside of the support fixing frame is fixedly provided with a second limiting sliding rod, the outer side of the second limiting sliding rod is slidably connected with a second limiting sliding sleeve, and the inclined supporting plate, the clamping side plate and the top supporting plate can clamp and position a plurality of welding parts of the lifting platform support steel frame body, so that the assembly of the lifting platform support steel frame body is completed, and the welding positions of the lifting platform support steel frame body can be preheated by cooperating with the far-infrared heater.

Description

Technical Field

[0001] This invention relates to the field of lifting platform technology, specifically to a positioning device for welding the support steel frame of a lifting platform. Background Technology

[0002] A lifting platform is a type of lifting machinery that vertically transports people or goods. It also refers to equipment used for vertical transport in logistics systems such as factories and automated warehouses. Lifting platforms are often equipped with various horizontal conveying devices as connecting devices for conveying lines at different heights. Small lifting platforms are characterized by their small size, flexible movement, and convenient operation. They can adapt to various work scenarios with limited space and are widely used in municipal maintenance, building material transfer, docks, logistics center cargo transportation, building decoration, and other scenarios.

[0003] In existing technologies, the welding of the support steel frame for small lifting platforms is done in stages. First, the base plate is welded. After the base plate is completed, the scissor bracing is raised, and then the top plate is welded. However, during the base plate welding, the scissor bracing is in a compressed state, which obstructs the view and makes observation difficult, leading to uneven welding. Furthermore, stress changes occur in some areas, causing tearing of weakly welded sections at the bottom during the subsequent raising of the scissor bracing. This poses a safety hazard at the welding site and easily leads to rework, affecting both welding quality and efficiency. Additionally, preheating the components is required during welding. Preheating each component individually not only affects welding efficiency but also results in uneven temperature distribution, increasing the temperature difference between the welding area and the welded parts. This increases thermal stress and residual deformation, further impacting weld quality.

[0004] Therefore, a positioning device for welding the support steel frame of a lifting platform is proposed to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a positioning device for welding the support steel frame of a lifting platform, to solve the problems mentioned in the background art. These problems arise because the scissor brace is in a compressed state during the welding of the base plate, which obstructs the view and makes observation difficult, leading to uneven welding and stress changes in some areas. During the subsequent ascent of the scissor brace, the weakly welded parts at the bottom may tear, posing a danger to the welding site and requiring rework, thus affecting both welding quality and efficiency. Furthermore, the need for preheating the workpieces during welding, which affects welding efficiency and causes uneven temperature distribution, increasing the temperature difference between the welding area and the welded parts, thereby increasing thermal stress and residual deformation, ultimately impacting welding quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a positioning device for welding the support steel frame of a lifting platform, comprising a welding pre-positioning mechanism and a positioning bracket installed on the outside of the welding pre-positioning mechanism; A welding mechanism is provided on the outside of the welding prepositioning mechanism, and lifting brackets are symmetrically provided on the outside of the welding mechanism. Also includes The positioning bracket is provided with a vertical positioning mechanism for vertically supporting the top plate of the lifting platform to be welded, and the vertical positioning mechanism can slide along the vertical direction of the positioning bracket. A lateral positioning mechanism is slidably installed on the positioning bracket. The lateral positioning mechanism can move closer to or further away from the scissor brace of the lifting platform in the lateral direction to abut against the outer wall of the scissor brace. The welding pre-positioning mechanism includes an ejector bracket, with symmetrical support brackets installed at the top and bottom of the ejector bracket. A second limiting sliding rod is fixedly installed inside the support bracket, and a second limiting sliding sleeve is slidably connected to the outer side of the second limiting sliding rod. A second limiting spring is fixedly connected to one side of the second limiting sliding sleeve, and a support rotating rod is rotatably connected to the top of the second limiting sliding sleeve. An inclined support plate is fixedly installed at the end of the support rotating rod and is rotatably connected to the support bracket. A bottom clamping fixing block is fixedly installed on one side of the bottom of the positioning bracket, and several support springs are fixedly installed at the bottom of the bottom clamping fixing block. A support base block is fixedly installed at the bottom of the support springs, and an anti-slip groove is provided at the bottom of the support base block. Several clamping rotating brackets are rotatably connected to one side of the bottom clamping fixing block. The clamping rotating bracket has a first limiting sliding rod fixedly installed inside. A first limiting sliding sleeve is slidably connected to the outside of the first limiting sliding rod. A first limiting spring is fixedly connected to one side of the first limiting sliding sleeve. A clamping rotating rod is rotatably connected to the bottom of the first limiting sliding sleeve. The clamping rotating rod is rotatably connected to the support base block. A clamping side plate is rotatably connected to the end of the clamping rotating bracket. The vertical positioning mechanism includes a top support plate, a first lifting motor is fixedly installed on one side of the top of the positioning bracket, a first lifting threaded rod is fixedly connected to the output end of the first lifting motor, a first lifting threaded sleeve is threadedly connected to the outer side of the first lifting threaded rod, the top support plate is fixedly installed on the outer side of the first lifting threaded sleeve, and a first lifting sliding sleeve is fixedly installed on one side of the top support plate. The first lifting sliding sleeve has a lifting sliding rod slidably connected inside. The lifting sliding rod is fixedly installed on one side of the positioning bracket. A second lifting motor is fixedly installed at the top center of the positioning bracket. A second lifting threaded rod is fixedly connected to the output end of the second lifting motor. A second lifting threaded sleeve is threadedly connected to the outer side of the second lifting threaded rod. The transverse positioning mechanism includes an ejector fixing frame, which is fixedly installed on the outer side of the second lifting threaded sleeve. A second lifting sliding sleeve is fixedly installed on one side of the ejection fixing frame. The second lifting sliding sleeve is slidably connected to the lifting sliding rod. An ejection motor is fixedly installed at the end of the ejection fixing frame. An ejection bidirectional threaded rod is fixedly connected to the output end of the ejection motor. An ejection threaded sleeve is symmetrically threaded to the outer side of the ejection bidirectional threaded rod. An ejection scissor brace is rotatably connected to the outer side of the ejection threaded sleeve. An ejection sliding sleeve is rotatably connected to the end of the ejection scissor brace. An ejection sliding rod is slidably connected inside the ejection sliding sleeve. The ejection sliding rod is fixedly installed inside the ejection bracket.

[0007] Preferably, the welding mechanism includes a welding workbench, a clamping motor is fixedly installed at the center of one end of the welding workbench, a clamping bidirectional threaded rod is fixedly connected to the output end of the clamping motor, a clamping threaded sleeve is symmetrically threaded to the outer side of the clamping bidirectional threaded rod, the clamping threaded sleeve is fixedly installed at the bottom of the positioning bracket, and a lifting platform support steel frame body is placed on the top of the welding workbench.

[0008] Preferably, the lifting brackets are symmetrically installed on both sides of the top of the welding workbench. The interior of each of the two lifting brackets is provided with a lifting slide groove. A winding bracket is symmetrically installed on the top of each of the two lifting brackets. A winding motor is fixedly installed on the outside of the winding bracket. A winding roller is fixedly connected to the output end of the winding motor. A winding steel wire rope is symmetrically wound on the outside of the winding roller. A fixed pulley is provided in the middle of the winding steel wire rope. The fixed pulley is symmetrically installed on the top of the lifting bracket.

[0009] Preferably, a translation bracket is fixedly installed at the end of the winding wire rope, and lifting limit blocks are fixedly installed at both ends of the translation bracket. A translation motor is fixedly installed on the outer side of one of the lifting limit blocks, and a translation threaded rod is fixedly connected to the output end of the translation motor. A translation threaded sleeve is threadedly connected to the outer side of the translation threaded rod, and a translation limit plate is fixedly installed at the bottom of the translation threaded sleeve. A welding robotic arm is fixedly installed at the bottom of the translation limit plate.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: This positioning device for welding the support steel frame of a lifting platform can clamp and position multiple welding parts of the lifting platform support steel frame body through a welding pre-positioning mechanism. This not only completes the assembly of the lifting platform support steel frame body but also supports the scissor braces of the main load-bearing parts. This allows for simultaneous welding of the scissor braces to the top and bottom plates, avoiding the phenomenon of insufficient weld strength in the area when the scissor braces are welded to the bottom plate first under traditional compression conditions due to obstructed vision. Furthermore, the welding pre-positioning mechanism can also ensure the stability of the welded parts on the bottom and top plates. After welding is completed, the support from the scissor braces is slowly removed, providing sufficient safety support for observing and inspecting the welding results. Simultaneously, it can be used in conjunction with far-infrared heaters to preheat the welded areas of the lifting platform's support steel frame. This overall preheating method ensures a more uniform temperature distribution in the workpiece, reducing the temperature difference between the weld zone and the base material, thereby reducing thermal stress and residual deformation. Preheating also slows down the cooling rate, preventing the formation of hardened structures such as martensite, and promotes hydrogen escape, significantly reducing the risk of cold cracking and hydrogen-induced cracking. This improves the welding effect of the lifting platform's support steel frame. The specific details are as follows: 1. By setting up a welding pre-positioning mechanism, not only can the upper and lower inclined support plates support the scissor braces inside the lifting platform support steel frame, thereby improving the welding stability of the scissor braces, but also, through the relative movement of the two positioning brackets, the clamping side plates can clamp and fix the bottom sides of the lifting platform support steel frame. Simultaneously, the elastic force of the first limit spring causes the first limit sliding sleeve to slide outside the first limit sliding rod, driving the clamping rotating rod to rotate, thus lowering the support base block. The anti-slip groove at the bottom of the support base block provides stable support, improving the clamping stability of the lifting platform support steel frame. Simultaneously, the first lifting motor is activated, driving the first lifting threaded rod to rotate, causing the first lifting threaded sleeve to move the top support plate up and down. The top support plate supports the top of the lifting platform support steel frame. The second lifting motor drives the second lifting threaded rod to rotate, causing the second lifting threaded sleeve to be ejected and fixed. The lifting and moving mechanism activates the ejector motor, which drives the ejector bidirectional threaded rod to rotate. This causes the ejector threaded sleeve to rotate, while the ejector scissor brace rotates. Simultaneously, the ejector sliding sleeve slides on the outside of the ejector sliding rod, enabling the ejector support to move. The ejector support then moves the support fixing frame and the inclined support plate, facilitating the support of the scissor brace. The inclined support plate, clamping side plate, and top support plate clamp and position multiple welded parts of the lifting platform support steel frame, completing the assembly of the lifting platform support steel frame. Simultaneously, it can be used with a far-infrared heater to preheat the welded areas of the lifting platform support steel frame. This overall preheating method results in a more uniform temperature distribution on the workpiece, reducing the temperature difference between the welded area and the base material, thereby reducing thermal stress and residual deformation. Preheating also slows down the cooling rate, preventing the formation of hardened structures such as martensite and promoting hydrogen escape, significantly reducing the risk of cold cracking and hydrogen-induced cracking, thus improving the welding effect of the lifting platform support steel frame. 2. By setting up a welding mechanism, not only can the clamping motor drive the clamping bidirectional threaded rod to rotate, causing the clamping threaded sleeve to move relative to the positioning bracket, facilitating the clamping and fixing of the lifting platform support steel frame, but also the winding motor can drive the winding roller to rotate, realizing the extension or retraction of the winding wire rope. Under the limiting action of the fixed pulley, the lifting and lowering movement of the translation bracket can be realized. At the same time, the translation motor can be started to drive the translation threaded rod to rotate, causing the translation threaded sleeve to move the translation limit plate and the welding robot arm. Through the movement of the welding robot arm, the omnidirectional welding of the lifting platform support steel frame can be realized. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the welding pre-positioning mechanism in this invention; Figure 3 This is a three-dimensional structural diagram of the positioning bracket in this invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the supporting base block in this invention; Figure 5 This is a three-dimensional cross-sectional structural diagram of the clamping and rotating bracket in this invention; Figure 6 This is a three-dimensional structural diagram of the top support plate in this invention; Figure 7 This is a three-dimensional structural diagram of the ejector support cross-section in this invention; Figure 8 This is a three-dimensional structural diagram of the inclined support plate in this invention; Figure 9 This is a three-dimensional structural diagram of the welding mechanism in this invention; Figure 10 This is a three-dimensional structural diagram of the coiled steel wire rope in this invention; Figure 11 This is a three-dimensional structural diagram of the translational support in this invention.

[0012] In the diagram: 1. Welding pre-positioning mechanism; 101. Positioning bracket; 102. Bottom clamping fixing block; 103. Support spring; 104. Support base block; 105. Anti-slip groove; 106. Clamping rotating bracket; 107. First limiting sliding rod; 108. First limiting sliding sleeve; 109. First limiting spring; 110. Clamping rotating rod; 111. First lifting motor; 112. First lifting threaded rod; 113. First lifting threaded sleeve; 114. Top support plate; 115. First lifting sliding sleeve; 116. Lifting sliding rod; 117. Second lifting motor; 118. Second lifting threaded rod; 119. Second lifting threaded sleeve; 120. Ejection fixing frame; 121. Second lifting sliding sleeve; 122. Ejection motor; 123. Ejection bidirectional threaded rod; 124. Ejection threaded sleeve; 125. Ejection scissor brace; 126. Ejection sliding... 127. Moving sleeve; 128. Ejecting sliding rod; 129. Ejecting bracket; 130. Support fixing frame; 131. Second limit sliding rod; 132. Second limit sliding sleeve; 133. Second limit spring; 134. Support rotating rod; 135. Inclined support plate; 136. Clamping side plate; 137. Lifting platform support steel frame body; 2. Welding mechanism; 201. Welding workbench; 202. Clamping motor; 203. Clamping double... 204. Threaded rod; 205. Clamping threaded sleeve; 206. Lifting bracket; 207. Lifting chute; 208. Winding bracket; 209. Winding motor; 210. Winding roller; 211. Winding wire rope; 212. Fixed pulley; 213. Translation bracket; 214. Lifting limit block; 215. Translation motor; 216. Translation threaded rod; 217. Translation threaded sleeve; 218. Translation limit plate; 219. Welding robotic arm. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figures 1-6 , Figure 9 This invention provides a technical solution: a positioning device for welding the support steel frame of a lifting platform, comprising a welding pre-positioning mechanism 1 and a positioning bracket 101 installed on the outside of the welding pre-positioning mechanism 1. A welding mechanism 2 is provided on the outside of the welding pre-positioning mechanism 1, and lifting brackets 205 are symmetrically arranged on the outside of the welding mechanism 2. A vertical positioning mechanism is provided on the positioning bracket 101 for vertically supporting the top plate of the lifting platform to be welded. The vertical positioning mechanism can slide along the vertical direction of the positioning bracket 101. A horizontal positioning mechanism is slidably installed on the positioning bracket 101. The horizontal positioning mechanism can move closer to or further away from the scissor brace of the lifting platform in the horizontal direction to abut against the outer wall of the scissor brace. The welding pre-positioning mechanism 1 includes a push-out support. The top and bottom of the support bracket 128 are symmetrically equipped with support fixing brackets 129. A second limiting sliding rod 130 is fixedly installed inside the support fixing bracket 129. A second limiting sliding sleeve 131 is slidably connected to the outside of the second limiting sliding rod 130. A second limiting spring 132 is fixedly connected to one side of the second limiting sliding sleeve 131. A support rotating rod 133 is rotatably connected to the top of the second limiting sliding sleeve 131. An inclined support plate 134 is fixedly installed at the end of the support rotating rod 133. The inclined support plate 134 is rotatably connected to the support fixing bracket 129. The upper and lower inclined support plates 134 are used to support the scissor brace inside the lifting platform support steel frame body 136, thereby improving the welding stability of the scissor brace.

[0015] Please see Figures 2-8A bottom clamping block 102 is fixedly installed on one side of the bottom of the positioning bracket 101. Several support springs 103 are fixedly installed on the bottom of the bottom clamping block 102. A support base block 104 is fixedly installed on the bottom of the support springs 103. An anti-slip groove 105 is provided on the bottom of the support base block 104. Several clamping rotating brackets 106 are rotatably connected to one side of the bottom clamping block 102. A first limiting sliding rod 107 is fixedly installed inside the clamping rotating bracket 106. A first limiting sliding sleeve 108 is slidably connected to the outside of the first limiting sliding rod 107. A first limiting spring 109 is fixedly connected to one side of the first limiting sliding sleeve 108. A clamping spring 109 is rotatably connected to the bottom of the first limiting sliding sleeve 108. The rotating rod 110 is rotatably connected to the support base block 104. The end of the clamping rotating bracket 106 is rotatably connected to the clamping side plate 135. Through the relative movement of the two positioning brackets 101, the clamping side plate 135 can clamp and fix the bottom sides of the lifting platform support steel frame body 136. At the same time, the elastic force of the first limiting spring 109 causes the first limiting sliding sleeve 108 to slide outside the first limiting sliding rod 107 while driving the clamping rotating rod 110 to rotate, thereby lowering the support base block 104. The anti-slip groove 105 at the bottom of the support base block 104 provides stable support for the support base block 104, improving the clamping stability of the lifting platform support steel frame body 136.

[0016] Please see Figures 2-8The vertical positioning mechanism includes a top support plate 114. A first lifting motor 111 is fixedly installed on one side of the top of the positioning bracket 101. A first lifting threaded rod 112 is fixedly connected to the output end of the first lifting motor 111. A first lifting threaded sleeve 113 is threadedly connected to the outer side of the first lifting threaded rod 112. The top support plate 114 is fixedly installed on the outer side of the first lifting threaded sleeve 113. A first lifting sliding sleeve 115 is fixedly installed on one side of the top support plate 114. A lifting sliding rod 116 is slidably connected inside the first lifting sliding sleeve 115. The lifting sliding rod 116 is fixedly installed inside the positioning bracket 101. On the side, a second lifting motor 117 is fixedly installed at the top center of the positioning bracket 101. A second lifting threaded rod 118 is fixedly connected to the output end of the second lifting motor 117. A second lifting threaded sleeve 119 is threadedly connected to the outer side of the second lifting threaded rod 118. The transverse positioning mechanism includes an ejector fixing frame 120, which is fixedly installed on the outer side of the second lifting threaded sleeve 119. A second lifting sliding sleeve 121 is fixedly installed on one side of the ejector fixing frame 120. The second lifting sliding sleeve 121 is slidably connected to the lifting sliding rod 116. An ejector motor 122 is fixedly installed at the end of the ejector fixing frame 120. The output end of the motor 122 is fixedly connected to an ejector bidirectional threaded rod 123. An ejector threaded sleeve 124 is symmetrically threaded to the outer side of the ejector bidirectional threaded rod 123. An ejector scissor brace 125 is rotatably connected to the outer side of the ejector threaded sleeve 124. An ejector sliding sleeve 126 is rotatably connected to the end of the ejector scissor brace 125. An ejector sliding rod 127 is slidably connected inside the ejector sliding sleeve 126. The ejector sliding rod 127 is fixedly installed inside the ejector bracket 128. Starting the first lifting motor 111 drives the first lifting threaded rod 112 to rotate, causing the first lifting threaded sleeve 113 to move the top support plate 114 up and down. The support plate 114 supports the top of the lifting platform support steel frame body 136. The second lifting motor 117 drives the second lifting threaded rod 118 to rotate, which causes the second lifting threaded sleeve 119 to drive the ejector fixed frame 120 to move up and down. The ejector motor 122 is started to drive the ejector bidirectional threaded rod 123 to rotate, which causes the ejector threaded sleeve 124 to drive the ejector scissor brace 125 to rotate. At the same time, the ejector sliding sleeve 126 slides on the outside of the ejector sliding rod 127 to realize the movement of the ejector bracket 128. The ejector bracket 128 can drive the support fixed frame 129 and the inclined support plate 134 to move, which facilitates the support of the scissor brace.

[0017] Please see Figures 1-2 , Figures 9-11The welding mechanism 2 includes a welding workbench 201. A clamping motor 202 is fixedly installed at the center of one end of the welding workbench 201. A clamping bidirectional threaded rod 203 is fixedly connected to the output end of the clamping motor 202. A clamping threaded sleeve 204 is symmetrically threaded to the outer side of the clamping bidirectional threaded rod 203. The clamping threaded sleeve 204 is fixedly installed at the bottom of the positioning bracket 101. A lifting platform support steel frame body 136 is placed on the top of the welding workbench 201. Lifting brackets 205 are symmetrically installed on both sides of the top of the welding workbench 201. Lifting grooves are opened inside both lifting brackets 205. 206. A winding bracket 207 is symmetrically installed on the top of each of the two lifting supports 205. A winding motor 208 is fixedly installed on the outer side of the winding bracket 207. A winding roller 209 is fixedly connected to the output end of the winding motor 208. A winding steel wire rope 210 is symmetrically wound on the outer side of the winding roller 209. A fixed pulley 211 is provided in the middle of the winding steel wire rope 210. The fixed pulleys 211 are symmetrically installed on the top of the lifting supports 205. A translation bracket 212 is fixedly installed at the end of the winding steel wire rope 210. Lifting limit blocks 213 are fixedly installed at both ends of the translation bracket 212. One side of the lifting limit block 213... A translation motor 214 is fixedly installed on the outer side of the lifting platform support frame 136. A translation threaded rod 215 is fixedly connected to the output end of the translation motor 214. A translation threaded sleeve 216 is threadedly connected to the outer side of the translation threaded rod 215. A translation limit plate 217 is fixedly installed at the bottom of the translation threaded sleeve 216. A welding robotic arm 218 is fixedly installed at the bottom of the translation limit plate 217. The clamping motor 202 drives the clamping bidirectional threaded rod 203 to rotate, causing the clamping threaded sleeve 204 to drive the positioning bracket 101 to move relative to it, which facilitates the clamping and fixing of the lifting platform support frame body 136. At the same time, the winding motor 208 drives the... The winding roller 209 rotates to extend or retract the winding wire rope 210. Under the limiting action of the fixed pulley 211, the translation support 212 can be lifted and moved. At the same time, the translation motor 214 is started to drive the translation threaded rod 215 to rotate, so that the translation threaded sleeve 216 drives the translation limit plate 217 and the welding robot arm 218 to move. Through the movement of the welding robot arm 218, the lifting platform support steel frame body 136 can be welded in all directions. The lifting platform in the attached drawings of this specification is only a rough illustration. Its main welding areas are the support steel frame, the platform frame and the support base and other components.

[0018] Working principle: Before using this positioning device for welding the support steel frame of a lifting platform, it is necessary to check the overall condition of the device to ensure it can function normally. Figure 1 - Figure 11As shown, firstly, the clamping motor 202 drives the clamping bidirectional threaded rod 203 to rotate, causing the clamping threaded sleeve 204 to move relative to the positioning bracket 101. Through the relative movement of the two positioning brackets 101, the clamping side plate 135 can clamp and fix the bottom sides of the lifting platform support steel frame body 136. At the same time, the elastic force of the first limiting spring 109 causes the first limiting sliding sleeve 108 to slide outside the first limiting sliding rod 107 while driving the clamping rotating rod 110 to rotate, thereby lowering the support base block 104. The anti-slip groove 105 at the bottom of the support base block 104 provides stable support for the support base block 104, improving the clamping stability of the lifting platform support steel frame body 136. Simultaneously, the first lifting motor 111 is started to drive the first lifting threaded rod 112 to rotate, causing the first lifting threaded sleeve 113 to move the top support plate 114 up and down, thereby supporting the top of the lifting platform support steel frame body 136.

[0019] Secondly, the second lifting motor 117 drives the second lifting threaded rod 118 to rotate, causing the second lifting threaded sleeve 119 to move the ejector fixing frame 120 up and down. The ejector motor 122 is then activated, driving the ejector bidirectional threaded rod 123 to rotate, causing the ejector threaded sleeve 124 to rotate the ejector scissor brace 125. Simultaneously, the ejector sliding sleeve 126 slides outside the ejector sliding rod 127, enabling the ejector bracket 128 to move. The ejector bracket 128 then moves the support fixing frame 129 and the inclined support plate 134. The upper and lower inclined support plates 134 support the scissor brace inside the lifting platform support steel frame body 136. During welding, the scissor brace is pre-positioned to facilitate the installation of the required welding parts, thereby improving the welding stability of the lifting platform. After pre-welding, the welding platform needs to be observed and inspected. The welding results ensure stable support of the scissor braces during their expansion and closure, thereby improving welding accuracy. The inclined support plate 134, clamping side plate 135, and top support plate 114 clamp and position multiple welded parts of the lifting platform support steel frame body 136, completing the assembly of the lifting platform support steel frame body 136. Simultaneously, it can be used with a far-infrared heater to preheat the welded areas of the lifting platform support steel frame body 136. Overall preheating results in a more uniform temperature distribution of the workpiece, reducing the temperature difference between the weld zone and the base material, thus reducing thermal stress and residual deformation. Preheating also slows down the cooling rate, preventing the formation of hardened structures such as martensite, and promotes hydrogen escape, significantly reducing the risk of cold cracking and hydrogen-induced cracking, thereby improving the welding effect of the lifting platform support steel frame body 136.

[0020] Finally, the winding motor 208 drives the winding roller 209 to rotate, thereby extending or retracting the winding wire rope 210. Under the limiting action of the fixed pulley 211, the translation support 212 can be lifted and moved. At the same time, the translation motor 214 is started to drive the translation threaded rod 215 to rotate, so that the translation threaded sleeve 216 drives the translation limit plate 217 and the welding robot arm 218 to move. Through the movement of the welding robot arm 218, the all-round welding of the lifting platform support steel frame body 136 can be achieved.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning device for welding the support steel frame of a lifting platform, comprising a welding pre-positioning mechanism (1) and a positioning bracket (101) installed on the outside of the welding pre-positioning mechanism (1). A welding mechanism (2) is provided on the outside of the welding prepositioning mechanism (1), and a lifting bracket (205) is symmetrically provided on the outside of the welding mechanism (2). Its features are, Also includes: The positioning bracket (101) is provided with a vertical positioning mechanism for vertically supporting the top plate of the lifting platform to be welded, and the vertical positioning mechanism can slide vertically along the positioning bracket (101). A transverse positioning mechanism is slidably installed on the positioning bracket (101). The transverse positioning mechanism can move closer to or further away from the scissor brace of the lifting platform in the transverse direction to abut against the outer wall of the scissor brace. The welding pre-positioning mechanism (1) includes an ejector bracket (128). Support brackets (129) are symmetrically installed at the top and bottom of the ejector bracket (128). A second limiting sliding rod (130) is fixedly installed inside the support bracket (129). A second limiting sliding sleeve (131) is slidably connected to the outer side of the second limiting sliding rod (130). A second limiting spring (132) is fixedly connected to one side of the second limiting sliding sleeve (131). A supporting rotating rod (133) is rotatably connected to the top of the second limiting sliding sleeve (131). An inclined support plate (134) is fixedly installed at the end of the positioning bracket (101). The inclined support plate (134) is rotatably connected to the support fixing frame (129). A bottom clamping fixing block (102) is fixedly installed on one side of the bottom of the positioning bracket (101). Several support springs (103) are fixedly installed on the bottom of the bottom clamping fixing block (102). A support bottom block (104) is fixedly installed on the bottom of the support springs (103). An anti-slip groove (105) is opened on the bottom of the support bottom block (104). Several clamping rotating brackets (106) are rotatably connected to one side of the bottom clamping fixing block (102). The clamping rotating bracket (106) is internally fixedly installed with a first limiting sliding rod (107), and a first limiting sliding sleeve (108) is slidably connected to the outside of the first limiting sliding rod (107). A first limiting spring (109) is fixedly connected to one side of the first limiting sliding sleeve (108). A clamping rotating rod (110) is rotatably connected to the bottom of the first limiting sliding sleeve (108). The clamping rotating rod (110) is rotatably connected to the support base block (104). A clamping side plate (135) is rotatably connected to the end of the clamping rotating bracket (106). The vertical positioning mechanism includes a top support plate (114), a first lifting motor (111) is fixedly installed on one side of the top of the positioning bracket (101), a first lifting threaded rod (112) is fixedly connected to the output end of the first lifting motor (111), a first lifting threaded sleeve (113) is threadedly connected to the outer side of the first lifting threaded rod (112), the top support plate (114) is fixedly installed on the outer side of the first lifting threaded sleeve (113), and a first lifting sliding sleeve (115) is fixedly installed on one side of the top support plate (114). The first lifting sliding sleeve (115) is slidably connected to a lifting sliding rod (116), the lifting sliding rod (116) is fixedly installed on one side of the positioning bracket (101), the positioning bracket (101) is fixedly installed at the top center position of a second lifting motor (117), the output end of the second lifting motor (117) is fixedly connected to a second lifting threaded rod (118), the outer side of the second lifting threaded rod (118) is threadedly connected to a second lifting threaded sleeve (119), the transverse positioning mechanism includes an ejector fixing frame (120), the ejector fixing frame (120) is fixedly installed on the outer side of the second lifting threaded sleeve (119); A second lifting sliding sleeve (121) is fixedly installed on one side of the ejection fixing frame (120). The second lifting sliding sleeve (121) is slidably connected to the lifting sliding rod (116). An ejection motor (122) is fixedly installed at the end of the ejection fixing frame (120). An ejection bidirectional threaded rod (123) is fixedly connected to the output end of the ejection motor (122). An ejection threaded sleeve (124) is symmetrically threaded on the outer side of the ejection bidirectional threaded rod (123). An ejection scissor brace (125) is rotatably connected to the outer side of the ejection threaded sleeve (124). An ejection sliding sleeve (126) is rotatably connected to the end of the ejection scissor brace (125). An ejection sliding rod (127) is slidably connected inside the ejection sliding sleeve (126). The ejection sliding rod (127) is fixedly installed inside the ejection bracket (128).

2. The positioning device for welding the support steel frame of a lifting platform according to claim 1, characterized in that: The welding mechanism (2) includes a welding workbench (201). A clamping motor (202) is fixedly installed at the center of one end of the welding workbench (201). A clamping bidirectional threaded rod (203) is fixedly connected to the output end of the clamping motor (202). A clamping threaded sleeve (204) is symmetrically threaded on the outer side of the clamping bidirectional threaded rod (203). The clamping threaded sleeve (204) is fixedly installed at the bottom of the positioning bracket (101). A lifting platform support steel frame body (136) is placed on the top of the welding workbench (201).

3. A positioning device for welding the support steel frame of a lifting platform according to claim 2, characterized in that: The lifting brackets (205) are symmetrically installed on the top two sides of the welding workbench (201). The interior of each of the two lifting brackets (205) is provided with a lifting slide groove (206). The top of each of the two lifting brackets (205) is symmetrically installed with a winding bracket (207). A winding motor (208) is fixedly installed on the outside of the winding bracket (207). A winding roller (209) is fixedly connected to the output end of the winding motor (208). A winding steel wire rope (210) is symmetrically wound on the outside of the winding roller (209). A fixed pulley (211) is provided in the middle of the winding steel wire rope (210). The fixed pulley (211) is symmetrically installed on the top of the lifting brackets (205).

4. A positioning device for welding the support steel frame of a lifting platform according to claim 3, characterized in that: A translation bracket (212) is fixedly installed at the end of the winding wire rope (210). A lifting limit block (213) is fixedly installed at both ends of the translation bracket (212). A translation motor (214) is fixedly installed on the outer side of one side of the lifting limit block (213). A translation threaded rod (215) is fixedly connected to the output end of the translation motor (214). A translation threaded sleeve (216) is threadedly connected to the outer side of the translation threaded rod (215). A translation limit plate (217) is fixedly installed at the bottom of the translation threaded sleeve (216). A welding robot arm (218) is fixedly installed at the bottom of the translation limit plate (217).

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