High-adaptability elevator car welding jig

Abstract

The invention discloses a high-adaptability elevator car body welding jig which is applied to the related technical field of welding jigs and can simplify the dismounting and mounting process of a limiting assembly, so that the mounting position of the limiting assembly can be quickly changed according to the size and shape of an elevator car part needing to be welded, and the welding efficiency is improved. The problem that in the prior art, a welding jig is difficult to adapt to welding of different parts of lift cars of different sizes is solved, in the process of installing a limiting assembly, by rotating a pre-lifting cushion block, the end cushion block can be driven to move upwards through inclined face matching between a lifting piece and the end cushion block, tight abutting between a jig platform and a bearing strip is achieved, and the welding quality is improved. Therefore, rapid locking of the limiting assembly is completed. Besides, in the welding process, the limiting stability of the limiting assembly on the lift car component can be monitored, so that abnormal deviation or looseness can be found in time, welding under the condition of unstable limiting is effectively avoided, the welding precision of the lift car is effectively guaranteed, and the defective rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding jigs, in particular to a high-adaptability elevator car body welding jig. BACKGROUND

[0002] The elevator car body is the core load-bearing structure of the elevator system, and its welding quality is directly related to the safety and service life of the entire elevator. During welding, a welding jig is usually used to position and fix the various components of the car body to ensure welding precision and consistency. However, existing elevator car body welding jigs mostly use fixed positioning structures, and the position adjustment range of their limiting components is limited, making it difficult to adapt to the welding needs of car bodies of different sizes. Especially when facing non-standard customized or significantly different size car body components, traditional jigs often need to frequently replace or re-adjust the positioning modules, resulting in low assembly efficiency, long adjustment period, and unstable positioning that can affect welding quality.

[0003] In addition, existing welding jigs either directly fix the limiting components on the jig or rely on bolts for fixation, which is cumbersome to disassemble and reassemble, increasing the labor intensity of the operators and making it difficult to achieve quick response and multi-station collaborative work. For example, the elevator beam welding jig disclosed in Chinese Patent CN211759542U and the welding jig for an elevator car bracket disclosed in Chinese Patent CN103722337B. The welding of the elevator car involves the welding of the top, bottom, support beams, etc., and the sizes vary greatly. Direct fixation or bolted limiting components have poor adaptability and are difficult to adapt to the welding of different car parts.

[0004] Therefore, there is an urgent need for a welding jig with high adaptability and quick adjustment of limiting components to meet the diversified and high-precision welding manufacturing needs of elevator car bodies. SUMMARY

[0005] The core of the present application is to simplify the disassembly and assembly process of the limiting components by using modular limiting components and U-shaped opening columns, allowing quick adjustment of the installation position according to the size and shape of the car parts to be welded, thereby solving the problem of existing welding jigs that are difficult to adapt to the welding of car parts of different sizes. During welding, the stability of the limiting components on the car parts can also be monitored to detect abnormal deviation or looseness in a timely manner, effectively preventing welding under unstable limiting conditions, thereby effectively ensuring the welding precision of the elevator car and reducing the rate of defective products.

[0006] To solve the above problems, the present application adopts the following technical solutions.

[0007] A highly adaptable elevator car welding fixture includes a fixture platform. Support legs are fixedly connected to the four corners of the bottom of the fixture platform. The upper part of the fixture platform has mounting holes arranged in a matrix. Multiple parallel support strips are installed on the bottom of the fixture platform via electric slide rails. Multiple grooves arranged in a linear array are carved on the support strips. The multiple support strips correspond to multiple columns of mounting holes in the matrix. Limiting components are inserted into some of the mounting holes. The lower end of the limiting components extends into the grooves. A U-shaped open post is sleeved on the outer end of the limiting components located below the fixture platform. The upper and lower ends of the U-shaped open post abut against the fixture platform and the support strips, respectively. The U-shaped open column includes two end blocks and a pre-lifting block located between the two end blocks. Both the end blocks and the pre-lifting block have U-shaped grooves cut in the middle. The ends of the two end blocks that are close to each other have guide ring grooves. At least four support rods are fixedly connected to the upper and lower ends of the pre-lifting block. The upper ends of the upper support rods are fixedly connected to guide strips. The guide strips and the lower support rods are respectively matched with the two guide ring grooves. A protruding strip is fixedly connected to the outer end of the middle of the pre-lifting block. Lifting plates are fixedly connected to the two upper ends of the opening of the pre-lifting block. The upper end of the lifting plate is a horizontal plane. The horizontal plane of the lifting plate is inclined to the upper end of the pre-lifting block and forms an inclined plane. The two lower ends of the opening of the upper end block are cut, and the slope of the cut is consistent with the slope of the inclined plane of the lifting plate.

[0008] Furthermore, the limiting component includes a column with a movable through-hole, a crossbar fixed through the top of the column, and a screw threaded to the end of the crossbar. An auxiliary ring is fixedly connected to the upper end of the screw, a pressure plate is snapped into the lower end of the screw, and a T-shaped base plate is fixedly connected to the lower end of the column. The T-shaped base plate matches the groove, and the U-shaped open column is located outside the column.

[0009] Furthermore, the two inner walls of the U-shaped grooves in the upper end pad are also cut, and when the U-shaped grooves on the end pad and the pre-lifting pad overlap, the cut end pad does not overlap with the horizontal plane of the lifting plate.

[0010] Optionally, the two support rods away from the opening of the U-shaped groove are configured in multiple sections. The multi-section support rod includes an outer cylinder that is fixed through the guide strip, a sensing section inserted into the outer cylinder, and a compression spring that is fixedly connected between the lower end of the sensing section and the bottom end of the outer cylinder. The sensing section includes an inner rod, a pressure sensor that is fixedly connected to the upper end of the inner rod, and an outer protrusion that is fixedly connected to the detection end of the pressure sensor.

[0011] Furthermore, the upper end of the protruding head has a spherical structure, and in its natural state, the distance between the top of the protruding head and the guide strip is not less than the height of the lifting plate.

[0012] Optionally, an offset monitoring column is movably embedded inside the horizontal plane of the lifting plate. The offset monitoring column movably passes through the lifting plate and extends into the end pad. The offset monitoring column includes a fixed column and a movable column fixedly connected to the bottom of the fixed column. The lower end of the movable column is fixedly connected to the end pad, and the top of the fixed column is flush with the surface of the lifting plate.

[0013] Furthermore, a light-measuring cavity is drilled inside the upper end of the fixed column, and a light sensor is fixedly installed at the center of the bottom end of the light-measuring cavity. Multiple rows of evenly arranged light guide holes are also drilled at the outer end of the fixed column, with multiple light guide holes in each row, and the light guide holes are connected to the light-measuring cavity.

[0014] Furthermore, the light guide holes are set at an angle, with the opening of the light guide hole on the outer wall of the fixed column being higher than the opening on the inner wall, and the diameter of the opening of the light guide hole facing outward is larger than the diameter of the other opening. The opening edges of multiple light guide holes in the same column are in contact with each other, and the top edge of the uppermost light guide hole is flush with the top of the fixed column.

[0015] Compared with the prior art, the advantages of this invention are: (1) This solution simplifies the assembly and disassembly process of the limiting components by setting up modular limiting components and U-shaped opening columns, so that the installation position can be quickly changed according to the size and shape of the car parts to be welded, thereby solving the problem that welding fixtures in the prior art are difficult to adapt to welding different parts of different car sizes.

[0016] (2) At the same time, during the welding process, the limiting stability of the limiting components on the car parts can be monitored, so as to detect abnormal deviations or loosening in time, effectively avoid welding under unstable limiting conditions, and thus effectively ensure the welding accuracy of the elevator car and reduce the defect rate. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a bottom-view perspective view of the present invention; Figure 3 This is a perspective view of the limiting component of the present invention connected to the support bar; Figure 4 This is a perspective view of the limiting component of the present invention; Figure 5 This is a three-dimensional comparison of the U-shaped opening post of the present invention before and after it is inserted into the limiting component; Figure 6 This is an exploded view of the U-shaped open column of the present invention; Figure 7 This is a bottom perspective view of the pre-lifting pad block of the present invention; Figure 8 This is a frontal comparison image of the U-shaped open column of the present invention before and after use; Figure 9 This is a top view comparison of the U-shaped open column of the present invention before and after its use; Figure 10 This is a cross-sectional view of the support rod of the present invention; Figure 11 This is a cross-sectional view of the support rod when the top of the annular groove of the present invention abuts against the guide strip; Figure 12 This is a cross-sectional schematic diagram of the lifting plate portion of the present invention; Figure 13 This is a comparison diagram of the offset monitoring column of the present invention before and after the U-shaped opening column is offset; Figure 14 This is a schematic cross-sectional view of the top portion of the offset monitoring column of the present invention; Figure 15 This is a comparison diagram of the light guide hole on the inner wall and the upper opening of the outer wall of the offset monitoring column of the present invention.

[0018] Explanation of the labels in the diagram: 1. Fixture platform, 101. Support leg, 102. Mounting hole, 2. Limiting component, 21. Column, 22. Horizontal bar, 23. Screw, 24. Pressure plate, 201. Auxiliary ring, 202. T-shaped base plate, 3. Bearing strip, 301. Groove, 4. U-shaped open column, 41. End pad, 42. Pre-lift pad, 43. Lifting piece, 401. U-shaped groove, 402. Protrusion, 51. Support rod, 52. Guide strip, 511. Outer cylinder, 512. Inner rod, 513. Outer protrusion, 514. Compression spring, 501. Guide ring groove, 502. Pressure sensor, 61. Fixed column, 62. Moving column, 601. Light guide hole, 602. Light sensor. Detailed Implementation

[0019] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0020] First implementation method: Figures 1-2The diagram illustrates a highly adaptable elevator car welding fixture, comprising a fixture platform 1. Support legs 101 are fixedly connected to the four corners of the bottom of the fixture platform 1. The upper end of the fixture platform 1 has mounting holes 102 arranged in a matrix. Multiple parallel support strips 3 are mounted on the bottom of the fixture platform 1 via electric slide rails. Multiple grooves 301 arranged in a linear array are carved on the support strips 3. Each support strip 3 corresponds to a row of mounting holes 102 in the matrix arrangement. Limiting components 2 are inserted into some of the mounting holes 102. The lower end of the limiting components 2 extends into the grooves 301, and a U-shaped open post 4 is fitted onto the outer end of the limiting components 2 located below the fixture platform 1. The upper and lower ends of the U-shaped open post 4 abut against the fixture platform 1 and the support strips 3, respectively. In use, the limiting components 2 can be installed at different locations and limited by the U-shaped open post 4, allowing multiple limiting components 2 to adapt to welding the top or bottom of elevator cars of different sizes.

[0021] like Figures 3-4 The limiting component 2 includes a column 21 with a movable through mounting hole 102, a crossbar 22 fixed through the top of the column 21, and a screw 23 threaded to the end of the crossbar 22. An auxiliary ring 201 is fixedly connected to the upper end of the screw 23, and a pressure plate 24 is snapped into the lower end of the screw 23. A T-shaped base plate 202 is fixedly connected to the lower end of the column 21. The T-shaped base plate 202 matches the groove 301. The U-shaped open column 4 is located outside the column 21.

[0022] It is worth noting that the outer diameter of the U-shaped open column 4 is larger than the outer diameter of the groove 301, which enables it to stably press the T-shaped base plate 202, thereby achieving the effect of limiting the positioning component 2 on the Z-axis.

[0023] In use, the car components to be welded can be assembled on the fixture platform 1 first. Then, the T-shaped base plates 202 at the bottom of the multiple limiting components 2 are removed, and the multiple limiting components 2 are passed through different mounting holes 102 respectively. Then, the T-shaped base plates 202 are connected to the bottom of the column 21. At the same time, the control support bar 3 is moved so that it is located directly below the row of mounting holes 102 where the limiting components 2 are located, so that the T-shaped base plates 202 can be smoothly inserted into the grooves 301. At this time, the U-shaped open column 4 is inserted into the bottom of the fixture platform 1 and above the support bar 3 along the opening of the U-shaped groove 401, thereby making... The U-shaped open column 4 presses the groove 301, making it difficult for the limiting component 2 to move along the Z-axis. Then, the limiting component 2 is rotated, causing the T-shaped base plate 202 to rotate within the groove 301, thereby achieving the effect of adjusting the position of the screw 23. Finally, the screw 23 is rotated manually or by inserting a pry bar into the mounting hole 102, causing it to move down with the pressure plate 24 until the pressure plate 24 presses on the corresponding position of the car component. When the pressure plates 24 on multiple limiting components 2 press on different parts of the car component in different directions, the limiting of the car component is achieved. Then, the car component can be welded using welding equipment.

[0024] In the above process, by setting the U-shaped open column 4, the position change between the multiple limiting components 2 and the fixture platform 1 is significantly reduced compared to the bolt installation in the prior art, which greatly reduces the cumbersomeness of disassembly and assembly. Under the condition of rapid disassembly and assembly, the multiple limiting components 2 can effectively adapt to the welding limit of larger car parts, thereby effectively improving the speed of welding positioning and accelerating the overall welding efficiency.

[0025] Second implementation method: This embodiment further improves the U-shaped opening column 4 based on the first embodiment, while the rest remains the same as the first embodiment.

[0026] Figures 5-6 As shown, the U-shaped open column 4 includes two end pads 41 and a pre-lifting pad 42 located between the two end pads 41. Both the end pads 41 and the pre-lifting pad 42 have U-shaped grooves 401 cut into their middle portions. The ends of the two end pads 41 that are close to each other each have guide ring grooves 501 cut into them. At least four support rods 51 are fixedly connected to both the upper and lower ends of the pre-lifting pad 42. Guide bars 52 are fixedly connected to the upper ends of the upper support rods 51. The guide bars 52 and the lower support rods 51 respectively match the two guide ring grooves 501. A protruding strip 40 is fixedly connected to the outer end of the middle portion of the pre-lifting pad 42. 2. The protrusion 402 facilitates the rotation of the middle pre-lifting pad 42, so that the U-shaped opening column 4 forms a complete ring, thereby effectively improving the limiting effect of the limiting component 2, making it less likely for the various parts of the car to loosen or shift during welding, and effectively ensuring welding accuracy. The two upper ends of the opening of the pre-lifting pad 42 are fixedly connected with lifting plates 43. The upper end of the lifting plate 43 is a horizontal plane, and the horizontal plane of the lifting plate 43 is inclined to the upper end of the pre-lifting pad 42 and presents an inclined surface. The two lower ends of the opening of the upper end pad 41 are cut, and the slope of the cut is consistent with the slope of the inclined surface of the lifting plate 43.

[0027] The two inner walls of the U-shaped groove 401 in the upper end pad 41, which are close to each other, are also cut. When the U-shaped groove 401 on the end pad 41 and the pre-lifting pad 42 overlap, the cut end pad 41 and the horizontal plane of the lifting plate 43 do not overlap. This effectively ensures that the higher horizontal plane will not affect the relative position between the end pad 41 and the pre-lifting pad 42 under normal circumstances. When the U-shaped open column 4 is installed between the fixture platform 1 and the bearing strip 3, the bottom of the upper end pad 41 can contact the pre-lifting pad 42, so that the overall height of the U-shaped open column 4 is slightly lower than the distance between the bearing strip 3 and the fixture platform 1, and the size difference between the two is exactly the height of the lifting plate 43. This allows it to be smoothly inserted into the limiting component 2 and enter between the fixture platform 1 and the bearing strip 3, effectively reducing the assembly difficulty of the limiting component 2.

[0028] like Figure 5 After the U-shaped open post 4 is inserted into the limiting component 2, the pre-lifting pad 42 can be rotated by the protrusion 402, causing its inner U-shaped groove 401 to gradually misalign with the U-shaped grooves 401 on the two end pads 41. This allows the three U-shaped grooves 401 to form a complete ring from a top-view angle, making it less likely for the U-shaped open post 4 to undergo relative displacement with respect to the limiting component 2, thus improving the limiting effect. Figures 8-9 Furthermore, during the rotation of the U-shaped groove 401, the inclined surface of the lifting plate 43 pushes against the inclined surface of the lower end of the upper end pad 41, causing the upper end pad 41 to gradually rise until the two inclined surfaces are misaligned. At this time, the horizontal surface of the lifting plate 43 contacts the plane of the lower end of the upper end pad 41, and the upper end pad 41 abuts against the bottom of the fixture platform 1. Compared with the fixed height U-shaped opening column 4 in the first embodiment, the height of the U-shaped opening column 4 is smaller during installation, which can easily enter between the fixture platform 1 and the support bar 3, and then raise its height. This can effectively reduce the wear of the U-shaped opening column 4, the fixture platform 1, and the support bar 3 during installation, and also reduce the installation difficulty, thereby further accelerating the replacement of the position of the limit component 2, and making the welding efficiency relatively high when welding different car components.

[0029] The third implementation method: This embodiment further improves the U-shaped opening column 4 based on the second embodiment, while the rest remains the same as the second embodiment.

[0030] Figure 10 As shown, the two support rods 51 away from the opening side of the U-shaped groove 401 are configured in multiple sections. The multi-section support rod 51 includes an outer cylinder 511 fixedly penetrating the guide bar 52, a sensing section inserted into the outer cylinder 511, and a compression spring 514 fixedly connected between the lower end of the sensing section and the inner bottom end of the outer cylinder 511. The sensing section includes an inner rod 512, a pressure sensor 502 fixedly connected to the upper end of the inner rod 512, and an outer protrusion 513 fixedly connected to the detection end of the pressure sensor 502. The upper end of the outer protrusion 513 has a spherical structure, and in its natural state, the distance between the top of the outer protrusion 513 and the guide bar 52 is not less than the height of the lifting plate 43.

[0031] In this embodiment, such as Figure 11 When the U-shaped open post 4 is not installed on the limiting assembly 2, the upper end pad 41 and the pre-lifting pad 42 are in contact with each other. At this time, the guide strip 52 abuts against the inner top of the guide ring groove 501. After being installed on the limiting assembly 2, the upper end pad 41 moves upward and contacts the lifting piece 43, and the guide ring groove 501 moves upward accordingly, so that there is a certain gap between the upper end of the guide strip 52 and the inner top of the guide ring groove 501. Figure 10At this point, without the resistance of the end pad 41, the sensing section rises under the action of the compression spring 514 and comes into contact with the top of the guide ring groove 501. During the welding process, when the U-shaped opening column 4 and the limiting component 2 have a certain relative displacement, that is, when the stability of the limiting component 2 is abnormal, the sensing section will also have a relative displacement with the limiting component 2. During the displacement, due to vibration or tilting of the upper end pad 41, the data of the pressure sensor 502 will fluctuate significantly. Based on the changes in the data of the pressure sensor 502, real-time monitoring of the limiting stability of multiple limiting components 2 on the car components can be realized, thereby effectively avoiding welding under unstable limiting conditions, thus effectively ensuring welding accuracy and reducing the defect rate of welding costs.

[0032] Fourth implementation method: This embodiment adds an offset monitoring column to the second embodiment, while the rest remains the same as the second embodiment.

[0033] Figure 12 As shown, an offset monitoring column is movably embedded inside the horizontal plane of the lifting plate 43. The offset monitoring column movably passes through the lifting plate 43 and extends into the end pad 41. The offset monitoring column includes a fixed column body 61 and a movable column body 62 fixedly connected to the bottom of the fixed column body 61. The lower end of the movable column body 62 is fixedly connected to the end pad 41, and the top of the fixed column body 61 is flush with the surface of the lifting plate 43. Figure 13 When the upper end pad 41 moves to contact the lifting plate 43, the end pad 41 generates a magnetic attraction force on the fixed column 61, causing the offset monitoring column to tend to move upward. When the U-shaped opening column 4 shifts, that is, when the upper end pad 41 shifts to the inclined side, a certain tilting misalignment occurs between the end pad 41 and the horizontal plane of the lifting plate 43, causing the upper end of the fixed column 61 to move slightly towards the pre-lifting pad 42, thus allowing the opening of the light guide hole 601 to slightly protrude. Figure 14 At this time, external light can enter the photometric cavity through the exposed light guide hole 601, which increases the detection data of the light sensor 602 inside. Based on this, the stability of the U-shaped open column 4 can also be monitored.

[0034] Furthermore, compared to the third embodiment, the light sensor 602 data in this embodiment is less affected by vibration, making its data more accurate. However, the components in the third embodiment are simpler and more common to implement, and the implementation cost is slightly lower. The specific implementation can be selected and set according to actual needs.

[0035] like Figure 14The upper end of the fixed column 61 has a photometer cavity drilled inside. A light sensor 602 is fixedly installed at the center of the bottom end of the photometer cavity. Multiple rows of evenly arranged light guide holes 601 are drilled on the outer end of the fixed column 61. Each row of light guide holes 601 contains multiple holes, and the light guide holes 601 communicate with the photometer cavity. Figures 14-15 The light guide hole 601 is inclined, with the opening on the outer wall of the fixed column 61 being higher than the opening on the inner wall. The diameter of the outward-facing opening of the light guide hole 601 is larger than the diameter of the other opening. The edges of the openings of multiple light guide holes 601 in the same row are in contact with each other, and the top edge of the uppermost light guide hole 601 is flush with the top of the fixed column 61. The larger outer opening allows the fixed column 61 to receive external light when it is slightly facing the surface of the lifting plate 43, thus achieving the effect of light transmission into the light measuring cavity. The smaller inner opening is mainly to ensure the strength of the fixed column 61, so that its strength is not weakened due to the opening, and thus it is not easily deformed or damaged, effectively ensuring the accuracy of the monitoring results.

[0036] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A highly adaptable elevator car welding fixture, comprising a fixture platform (1), wherein support legs (101) are fixedly connected to the four corners of the bottom of the fixture platform (1), characterized in that: The upper end of the fixture platform (1) is drilled with mounting holes (102) arranged in a matrix. The bottom of the fixture platform (1) is equipped with multiple parallel bearing strips (3) arranged in a motorized slide rail. Multiple grooves (301) arranged in a linear array are drilled on the bearing strips (3). The multiple bearing strips (3) correspond to multiple columns of mounting holes (102) in the matrix arrangement. A limiting component (2) is inserted into some of the mounting holes (102). The lower end of the limiting component (2) extends into the groove (301). The outer end of the limiting component (2) located below the fixture platform (1) is fitted with a U-shaped open post (4). The upper and lower ends of the U-shaped open post (4) abut against the fixture platform (1) and the bearing strips (3) respectively. The U-shaped open column (4) includes two end pads (41) and a pre-lifting pad (42) located between the two end pads (41). Both the end pads (41) and the pre-lifting pad (42) have U-shaped grooves (401) carved in their middle sections. Guide ring grooves (501) are carved at the ends of the two end pads (41) that are close to each other. At least four support rods (51) are fixedly connected to both the upper and lower ends of the pre-lifting pad (42). A guide strip (52) is fixedly connected to the upper ends of the multiple upper support rods (51). The guide strip (52) and the lower... Multiple support rods (51) are matched with two guide ring grooves (501) respectively. A protrusion (402) is fixedly connected to the outer end of the middle part of the pre-lifting pad (42). Lifting plates (43) are fixedly connected to the two upper ends of the opening of the pre-lifting pad (42). The upper end of the lifting plate (43) is a horizontal plane. The horizontal plane of the lifting plate (43) is inclined to the upper end of the pre-lifting pad (42) and presents an inclined plane. The two lower ends of the opening of the upper end pad (41) are cut, and the slope of the cut is consistent with the slope of the inclined plane of the lifting plate (43).

2. The highly adaptable elevator car welding fixture according to claim 1, characterized in that: The limiting component (2) includes a column (21) with a movable through mounting hole (102), a crossbar (22) fixed through the top of the column (21), and a screw (23) threaded to the end of the crossbar (22). An auxiliary ring (201) is fixedly connected to the upper end of the screw (23), and a pressure plate (24) is snapped into the lower end of the screw (23). A T-shaped base plate (202) is fixedly connected to the lower end of the column (21). The T-shaped base plate (202) matches the groove (301). The U-shaped open column (4) is located outside the column (21).

3. The highly adaptable elevator car welding fixture according to claim 1, characterized in that: The two inner walls of the U-shaped groove (401) openings of the upper end pad (41) are also cut, and when the U-shaped grooves (401) on the end pad (41) and the pre-lifting pad (42) overlap, the cut end pad (41) does not overlap with the horizontal plane of the lifting piece (43).

4. The highly adaptable elevator car welding fixture according to claim 3, characterized in that: The two support rods (51) far from the opening side of the U-shaped groove (401) are configured in multiple sections. The multi-section support rod (51) includes an outer cylinder (511) fixedly passing through the guide strip (52), a sensing section inserted into the outer cylinder (511), and a compression spring (514) fixedly connected between the lower end of the sensing section and the bottom end of the outer cylinder (511). The sensing section includes an inner rod (512), a pressure sensor (502) fixedly connected to the upper end of the inner rod (512), and an outer protrusion (513) fixedly connected to the detection end of the pressure sensor (502).

5. The highly adaptable elevator car welding fixture according to claim 4, characterized in that: The upper end of the protruding head (513) is a spherical structure, and in its natural state, the distance between the top of the protruding head (513) and the guide strip (52) is not less than the height of the lifting plate (43).

6. The highly adaptable elevator car welding fixture according to claim 1, characterized in that: An offset monitoring column is movably embedded inside the horizontal plane of the lifting plate (43). The offset monitoring column movably passes through the lifting plate (43) and extends into the end pad (41). The offset monitoring column includes a fixed column body (61) and a movable column body (62) fixedly connected to the bottom of the fixed column body (61). The lower end of the movable column body (62) is fixedly connected to the end pad (41), and the top of the fixed column body (61) is flush with the surface of the lifting plate (43).

7. A highly adaptable elevator car welding fixture according to claim 6, characterized in that: The upper end of the fixed column (61) has a photometer cavity, and a light sensor (602) is fixedly installed at the center of the bottom end of the photometer cavity. The outer end of the fixed column (61) also has multiple rows of evenly arranged light guide holes (601), and each row of light guide holes (601) has multiple holes, and the light guide holes (601) are connected to the photometer cavity.

8. The highly adaptable elevator car welding fixture according to claim 7, characterized in that: The light guide hole (601) is inclined. The opening of the light guide hole (601) on the outer wall of the fixed column (61) is higher than the opening on the inner wall. The diameter of the opening of the light guide hole (601) facing outward is larger than the diameter of the other opening. The opening edges of the multiple light guide holes (601) in the same column are in contact with each other. The uppermost edge of the uppermost light guide hole (601) is flush with the top of the fixed column (61).

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