Wagon welding fixing device

Abstract

The utility model provides a railway wagon welding fixing device which comprises a fixing frame, a clamping unit and a switching unit, the fixing frame is provided with a containing groove used for containing the side wall of a carriage, and the fixing frame is connected to a rack in a rotating and / or sliding mode so that the fixing frame can be switched between a containing state and a fixing state; the clamping unit comprises a plurality of clamping assemblies which are symmetrically arranged on the fixing frame along a first path, and the multiple clamping assemblies are used for clamping and fixing the side wall of the carriage; the switching unit comprises a switching driver and a transmission mechanism connected to the switching driver, the transmission mechanism is further connected with the fixing frame, and the switching driver drives the transmission mechanism to rotate or slide so as to control the fixing frame to be switched between the containing state and the fixing state. The utility model provides a railway wagon welding fixing device and aims to solve the problems that in the prior art, the strength of inclined struts and transverse belts of carriages is large, gaps between the inclined struts and side plates and gaps between the transverse belts and end plates are difficult to adjust only by means of manual force application, the assembling gaps of the carriages are large, and the welding quality is affected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of car maintenance tooling, more specifically, relate to a railway freight car welding fixing device. BACKGROUND

[0002] In recent years, the reform of repair program and repair system vehicle is due, and the end plate and side plate are seriously corroded and damaged. When the railway freight car is repaired, the corroded and damaged side plate and end plate need to be replaced. When the side plate and end plate are replaced, the corroded and damaged side plate and end plate need to be disassembled and separated by using flame cutting or plasma cutting process. According to the previous repair experience and statistical results, most of the car's diagonal brace groups and cross belts are in good condition and do not need to be replaced and repaired. Therefore, the intact part of the car needs to be protected during disassembly to avoid unnecessary loss caused by over-disassembly or mis-disassembly.

[0003] After disassembly, the new side plate and end plate need to be welded to the car. In order to ensure the overall assembly size and welding quality of the railway freight car, the gap between the new side plate or end plate and the car needs to be precisely controlled, and the welding deformation needs to be controlled within a reasonable range. However, due to the high strength of the diagonal brace and the cross belt, when adjusting the gap between the side plate and the diagonal brace and the gap between the end plate and the cross belt, a simple clamp is manually held and heated by flame to adjust the diagonal brace or cross belt point by point. Meanwhile, the operating personnel also need to cooperate with each other for welding operation. The labor of the operating personnel is huge, and the work efficiency is low. Since the existing clamp mainly relies on the force of the operator, it is easy to cause unstable clamping during welding. UTILITARIAN CONTENT

[0004] The utility model aims at providing a railway freight car welding fixing device, which aims to solve the problem that the diagonal brace and cross belt of the existing car have high strength, and it is difficult to adjust the gap between the diagonal brace and the side plate and the gap between the cross belt and the end plate only by manual force, resulting in large car assembly gap and affecting the welding quality.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0006] Firstly, a railway freight car welding fixing device is provided, which comprises:

[0007] The fixing frame has a containing groove for containing the car side wall, and the fixing frame is rotationally and / or slidably connected to the rack, so that the fixing frame can be switched between the storage state and the fixed state. In the storage state, the car side wall is located outside the containing groove, and in the fixed state, the car side wall is located inside the containing groove.

[0008] The clamping unit comprises a plurality of clamping assemblies symmetrically arranged along a first path on the fixed frame, the clamping assemblies are movable along the first path, and the plurality of clamping assemblies are used for clamping and fixing the side wall of the carriage.

[0009] The switching unit comprises a switching driver and a transmission mechanism connected to the switching driver, the transmission mechanism is further connected to the fixed frame, and the switching driver drives the transmission mechanism to rotate or slide to control the fixed frame to switch between the storage state and the fixed state.

[0010] In a possible implementation, the transmission mechanism comprises:

[0011] A transmission gear connected to the switching driver, the switching driver controls the transmission gear to rotate around its own axis; and

[0012] A transmission rack extending in the up-down direction and meshing with the transmission gear, and the fixed frame is connected to the transmission rack.

[0013] In a possible implementation, the transmission mechanism comprises:

[0014] A driving gear connected to the switching driver, the switching driver controls the driving gear to rotate around its own axis;

[0015] A driven gear connected to the fixed frame, the axis of the driven gear is parallel to the axis of the driving gear; and

[0016] A transmission chain connected at the head and tail to surround the driving gear and the driven gear outside and mesh with the driving gear and the driven gear respectively, the transmission chain is used to drive the driven gear to rotate.

[0017] In a possible implementation, the railway wagon welding fixing device further comprises an adjusting unit, and the adjusting unit comprises:

[0018] An adjusting driver; and

[0019] A walking assembly connected to the adjusting driver and connected to the fixed frame, the walking assembly is movable along a second path, is used for adjusting the position of the fixed frame on the second path, and the second path is perpendicular to the first path.

[0020] In a possible implementation, the walking assembly comprises:

[0021] A walking support, the adjusting driver is fixed to the walking support, and the walking support is further connected to the fixed frame; and

[0022] A walking wheel is rotatably connected to the walking support and connected with the adjusting driver, the adjusting driver being configured to drive the walking wheel to rotate about an axis of the walking wheel, the axis of the walking wheel being parallel to the first path, and the walking wheel being configured to abut against the frame in the up-down direction.

[0023] In a possible implementation, the adjusting unit further comprises a fine adjustment assembly, the fine adjustment assembly comprising:

[0024] A fine adjustment support extending along the first path, and the adjusting driver and the walking assembly being arranged on the fine adjustment support; and

[0025] A fine adjustment mechanism arranged on the fine adjustment support and connected with the fixed frame, the fine adjustment mechanism being configured to drive the fixed frame to move along the first path.

[0026] In a possible implementation, the fine adjustment mechanism comprises:

[0027] A fine adjustment driver arranged on the fine adjustment support; and

[0028] A fine adjustment screw rod parallel to the first path, an end of the fine adjustment screw rod being connected with the fine adjustment driver, and the fixed frame being connected with a nut of the fine adjustment screw rod and slidingly connected with the fine adjustment support along the first path.

[0029] In a possible implementation, the clamping assembly comprises a clamping mechanism moving along the first path, the clamping mechanism being a telescopic member telescoping along the first path, or the clamping mechanism comprising a clamping driver, a clamping gear connected with the clamping driver, and a clamping rack connected with the clamping gear, the clamping rack extending along the first path and being configured to abut against the side wall of the carriage.

[0030] In a possible implementation, the clamping assembly further comprises a lifting mechanism connected with the clamping mechanism, the lifting mechanism being configured to drive the clamping mechanism to move in the up-down direction.

[0031] In a possible implementation, the lifting mechanism comprises:

[0032] A lifting driver arranged on the fixed frame; and

[0033] A lifting screw rod parallel to the up-down direction, one end of the lifting screw rod being connected with the lifting driver, and the other end of the lifting screw rod being connected with the fixed frame through a bearing, and the clamping mechanism being connected with a nut of the lifting screw rod and slidingly connected with the fixed frame in the up-down direction.

[0034] The advantages of the railway freight car welding and fixing device provided by this utility model are as follows: Compared with the prior art, the railway freight car welding and fixing device of this utility model connects the fixing frame to the frame by rotation or sliding, thereby switching between a stored state and a fixed state. When welding operations are required on the freight car, the fixing frame is switched to the fixed state, the side wall of the car is located in the receiving groove, and the corresponding two sets of clamping components abut against the side wall of the car along the first path, thereby fixing the side wall of the car and avoiding displacement between the various components of the side wall of the car during welding. This ensures that the parameters such as the misalignment of the side plate or end plate with the car frame and the reduction of assembly meet the requirements, thereby controlling the welding deformation within a reasonable range. After welding is completed, the switching unit switches the fixing frame to the stored state, making it convenient to remove the car and avoiding interference between the fixing frame and the car. The fixing frame in this utility model is connected to the frame, eliminating the need for manual hand-held clamps, and the clamping components achieve clamping and fixing of the side wall of the car by moving along the first path, ensuring the stability of the side wall of the car during welding, improving the reliability of clamping and fixing, and reducing the amount of welding deformation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the structure of the railway freight car welding and fixing device provided in the embodiment of this utility model;

[0037] Figure 2 A structural diagram of a railway freight car welding and fixing device provided in another embodiment of this utility model.

[0038] In the diagram: 1. Frame; 2. Fixing frame; 201. Receiving slot; 3. Clamping unit; 301. Clamping mechanism; 302. Lifting mechanism; 4. Switching unit; 401. Switching driver; 402. Transmission mechanism; 4021. Driving gear; 4022. Driven gear; 4023. Transmission chain; 5. Adjustment unit; 501. Adjustment driver; 502. Walking assembly; 5021. Walking bracket; 5022. Walking wheel; 503. Fine-tuning assembly; 5031. Fine-tuning bracket; 5032. Fine-tuning mechanism. Detailed Implementation

[0039] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.

[0040] In the claims, the specification, and the drawings of the utility model, unless otherwise expressly specified, such as using the terms "first", "second" or "third", etc., are all for distinguishing different objects, and are not used to describe a specific order. Unless otherwise stated, the remaining orientation words, such as "vertical", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the utility model. In the claims, the specification and the above drawings of the utility model, unless otherwise expressly specified, such as using the terms "fixedly connected" or "fixedly connected", should be understood broadly, that is, any connection mode without displacement relationship and relative rotation relationship between the two, that is, it means including non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements. In the claims, the specification and the above drawings of the utility model, such as using the terms "including", "having" and their variants, are intended to "include but not limited to".

[0041] Please see Figure 1 And Figure 2 The railway wagon welding fixing device provided by the utility model will be described. The railway wagon welding fixing device comprises a fixing frame 2, a clamping unit 3 and a switching unit 4, the fixing frame 2 has an accommodating groove 201 for accommodating a carriage side wall, the fixing frame 2 is rotationally and / or slidingly connected to the rack 1, so that the fixing frame 2 is switched between a storage state and a fixed state, in the storage state, the carriage side wall is located outside the accommodating groove 201, and in the fixed state, the carriage side wall is located in the accommodating groove 201; the clamping unit 3 comprises a plurality of clamping assemblies symmetrically arranged along a first path on the fixing frame 2, the clamping assemblies move along the first path, and the plurality of clamping assemblies are used for clamping and fixing the carriage side wall; the switching unit 4 comprises a switching driver 401 and a transmission mechanism 402 connected to the switching driver 401, the transmission mechanism 402 is further connected to the fixing frame 2, and the switching driver 401 drives the transmission mechanism 402 to rotate or slide, so as to control the fixing frame 2 to be switched between the storage state and the fixed state.

[0042] Compared with the prior art, the railway wagon welding fixing device provided by the utility model switches between the storage state and the fixing state by rotating or sliding the fixing frame 2 on the rack 1. When welding operation on the wagon compartment is needed, the fixing frame 2 is switched to the fixing state, the compartment side wall is located in the containing groove 201, and the two groups of clamping assemblies correspondingly abut on the compartment side wall along the first path, so that the compartment side wall is fixed, displacement between the components of the compartment side wall during welding is avoided, the parameters such as the deviation of the side plate or the end plate from the wagon framework and the assembly are ensured to meet the requirements, and the welding deformation is controlled within a reasonable range. After welding is completed, the switching unit 4 switches the fixing frame 2 to the storage state, the compartment is conveniently removed, and interference between the fixing frame and the compartment is avoided. In the utility model, the fixing frame 2 is connected to the rack 1, manual holding of the clamp is not needed, the clamping assembly is moved along the first path to realize clamping and fixing of the compartment side wall, the stability of the compartment side wall during welding is ensured, the reliability of clamping and fixing is improved, and the welding deformation is reduced.

[0043] It should be noted that the "compartment side wall" in the present application refers to the structure of the compartment end plate, the side plate and the like except the compartment bottom plate and the top plate, for example, the compartment framework and the side plate, so that the parameters such as the edge deviation of the new side plate or end plate from the compartment and the assembly gap are accurately controlled.

[0044] It should be noted that the "rack 1" refers to a frame body arranged on the ground or a workbench, which has a mounting portion located above the compartment, and the fixing frame 2 is connected to the mounting portion.

[0045] Optionally, the fixing frame 2 is slidingly connected to the rack 1 in the up-down direction, the switching driver 401 is a hydraulic or pneumatic telescopic member, and the transmission mechanism 402 is a transmission rod. The hydraulic or pneumatic telescopic member is telescopic in the up-down direction to drive the transmission rod to move in the up-down direction, so as to realize switching of the fixing frame 2 between the fixing state and the storage state.

[0046] In some embodiments, not shown in the figure, the transmission mechanism 402 includes a transmission gear and a transmission rack. The transmission gear is connected to the switching driver 401, and the switching driver 401 controls the transmission gear to rotate around its own axis. The transmission rack extends in the up-down direction and is engaged with the transmission gear, and the fixing frame 2 is connected to the transmission rack.

[0047] In the embodiment, the switching driver 401 drives the transmission gear to rotate, and then the transmission rack engaged with the transmission gear moves up and down, and the fixing frame 2 connected to the transmission rack moves up and down, so as to realize switching of the fixing frame 2 between the storage state and the fixing state. The transmission gear and the transmission rack are engaged to control the fixing frame 2, the position of the fixing frame 2 can be accurately adjusted and controlled, and interference with the fixing frame 2 during movement of the compartment is avoided.

[0048] Optionally, the switching driver 401 is fixed to the frame 1.

[0049] Optionally, the switching driver 401 is a motor.

[0050] In some embodiments, referring to Figure 1 , the transmission mechanism 402 comprises a driving gear 4021, a driven gear 4022 and a transmission chain 4023, the driving gear 4021 is connected to the switching driver 401, the switching driver 401 controls the driving gear 4021 to rotate around its axis; the driven gear 4022 is connected to the fixed frame 2, the axis of the driven gear 4022 is parallel to the axis of the driving gear 4021; the transmission chain 4023 is connected at its head and tail and is arranged outside the driving gear 4021 and the driven gear 4022 and is engaged with the driving gear 4021 and the driven gear 4022 respectively, the transmission chain 4023 is used to drive the driven gear 4022 to rotate.

[0051] The switching driver 401 drives the driving gear 4021 to rotate and drives the driven gear 4022 to rotate synchronously through the transmission chain 4023, the fixed frame 2 connected to the driven gear 4022 is flipped, thereby realizing the switching between the fixed state and the storage state. In this embodiment, the switching between the fixed state and the storage state is realized by flipping the fixed frame 2, which reduces the requirement for space during the switching of the fixed frame 2.

[0052] In some embodiments, referring to Figure 2 , the welded fixing device of the railway wagon further comprises an adjusting unit 5, the adjusting unit 5 comprises an adjusting driver 501 and a walking assembly 502; the walking assembly 502 is connected to the adjusting driver 501 and is connected to the fixed frame 2, the walking assembly 502 moves along a second path, which is perpendicular to the first path, to adjust the position of the fixed frame 2 on the second path.

[0053] The adjusting driver 501 drives the walking assembly 502 to move along the second path, so that the fixed frame 2 connected to the walking assembly 502 can be moved to a specified position along the second path to clamp and fix the area of the wagon side wall that needs to be welded. In this embodiment, the wagon does not need to be moved, and the position of the fixed frame 2 can be adjusted to clamp and fix the specified area of the wagon, thereby improving the maintenance efficiency.

[0054] Specifically, the walking assembly 502 is directly or indirectly connected to the fixed frame 2.

[0055] Optionally, the adjusting driver 501 is a telescopic member or a motor, and when the adjusting driver 501 is a motor, the walking assembly 502 is a walking lead screw or a gear and rack structure, the walking lead screw is parallel to the second path, and the fixed frame 2 is connected to the nut of the walking lead screw.

[0056] In some embodiments, referring to Figure 2The walking assembly 502 comprises a walking support 5021 and a walking wheel 5022, the adjustment driver 501 is fixed to the walking support 5021, and the walking support 5021 is further connected to the fixed frame 2; the walking wheel 5022 is rotationally connected to the walking support 5021 and connected to the adjustment driver 501, the adjustment driver 501 is used to drive the walking wheel 5022 to rotate around its own axis, and the axis of the walking wheel 5022 is parallel to the first path, and the walking wheel 5022 abuts against the rack 1 in the up-down direction.

[0057] The adjustment driver 501 drives the walking wheel 5022 to rotate, the rack 1 provides a supporting force for the walking wheel 5022, the walking wheel 5022 generates a rolling friction force with the rack 1, the walking wheel 5022 moves along the second path, and the fixed frame 2 is driven to move. In this embodiment, the resistance during the movement of the walking wheel 5022 is reduced, and the energy consumption of the adjustment driver 501 is reduced.

[0058] Optionally, the walking support 5021 is directly or indirectly connected to the fixed frame 2.

[0059] Optionally, the adjustment driver 501 is a motor.

[0060] In some embodiments, referring to Figure 2 The adjustment unit 5 further comprises a fine adjustment assembly 503, the fine adjustment assembly 503 comprises a fine adjustment support 5031 and a fine adjustment mechanism 5032, the fine adjustment support 5031 extends along the first path, and the adjustment driver 501 and the walking assembly 502 are arranged on the fine adjustment support 5031; the fine adjustment mechanism 5032 is arranged on the fine adjustment support 5031 and connected to the fixed frame 2, and the fine adjustment mechanism 5032 is used to drive the fixed frame 2 to move along the first path.

[0061] The fine adjustment mechanism 5032 drives the fixed frame 2 to move along the first path, the position of the fixed frame 2 can be adjusted along the first path, so that the fixed frame 2 is adapted to carriages of different sizes (different sizes of the first path), the application range is expanded, the position of the carriage does not need to be adjusted, and the maintenance efficiency is improved.

[0062] Optionally, the fine adjustment driver can be a gas pressure or hydraulic telescopic member that telescopes along the first path, and the fine adjustment mechanism 5032 is a connecting frame structure.

[0063] Optionally, the fine adjustment mechanism 5032 is directly or indirectly connected to the fixed frame 2.

[0064] In some embodiments, referring to Figure 2 The fine adjustment mechanism 5032 comprises a fine adjustment driver and a fine adjustment lead screw, the fine adjustment driver is arranged on the fine adjustment support 5031; the fine adjustment lead screw is parallel to the first path, the end of the fine adjustment lead screw is connected to the fine adjustment driver, the fixed frame 2 is connected to the nut of the fine adjustment lead screw and slidably connected to the fine adjustment support 5031 along the first path.

[0065] The embodiment adopts the screw rod to adjust the position of the fixing frame 2 in the first path, and has higher adjustment accuracy, and the fixing frame 2 does not need to be manually moved, thereby improving the adjustment efficiency.

[0066] Optionally, the fine adjustment driver is an electric motor.

[0067] In some embodiments, referring to Figure 1 and Figure 2 , the clamping assembly comprises clamping mechanisms 301 moving along the first path, the clamping mechanisms 301 are telescopic members telescoping along the first path, or the clamping mechanisms 301 comprise clamping drivers, clamping gears connected to the clamping drivers, and clamping racks connected to the clamping gears, the clamping racks extend along the first path and are used to abut against the side walls of the vehicle compartment.

[0068] When the two symmetrical groups of clamping mechanisms 301 are extended, they respectively abut against the side walls of the vehicle compartment, so as to clamp and fix the side walls of the vehicle compartment. When the two symmetrical groups of clamping mechanisms 301 are retracted, they respectively separate from the side walls of the vehicle compartment, so as to release the side walls of the vehicle compartment. Or the clamping drivers (electric motors) control the clamping gears to rotate, so that the clamping racks meshing with the clamping gears move along the first path, thereby abutting against the side walls of the vehicle compartment, so as to clamp and fix the side walls of the vehicle compartment.

[0069] Optionally, the clamping mechanisms 301 are hydraulic or pneumatic telescopic members, or the clamping drivers are electric motors.

[0070] In some embodiments, referring to Figure 1 and Figure 2 , the clamping assembly further comprises lifting mechanisms 302 connected to the clamping mechanisms 301, the lifting mechanisms 302 are used to drive the clamping mechanisms 301 to move in the up-down direction.

[0071] The lifting mechanisms 302 are used to adjust the positions of the clamping mechanisms 301 in the up-down direction, so that different height regions of the side walls of the vehicle compartment can be clamped and fixed, without the need to adjust the height of the vehicle compartment, thereby further improving the convenience of maintenance.

[0072] Optionally, the lifting mechanisms 302 are hydraulic or pneumatic telescopic members.

[0073] In some embodiments, referring to Figure 1 , the lifting mechanisms 302 comprise lifting drivers and lifting screw rods, the lifting drivers are arranged on the fixing frame 2; the lifting screw rods are parallel to the up-down direction, one end of each of the lifting screw rods is connected to the lifting driver, the other end of each of the lifting screw rods is connected to the fixing frame 2 through a bearing, and the clamping mechanisms 301 are connected to the nuts of the lifting screw rods and are slidingly connected to the fixing frame 2 in the up-down direction.

[0074] The lifting driver controls the rotation of the lifting screw, so that the fixing frame 2 connected to the lifting screw nut moves in the up-down direction to clamp and fix the specified height of the car side wall. Compared with the telescopic adjustment scheme, the adjustment accuracy is higher.

[0075] The above only describes the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A railway wagon welding fixture, characterised in that, The railway wagon welding fixing device comprises a fixing frame, a clamping unit and a switching unit. The fixing frame has a receiving groove for receiving a wagon side wall, and is rotationally and / or slidingly connected to a rack to switch the fixing frame between a receiving state and a fixing state. In the receiving state, the wagon side wall is located outside the receiving groove. In the fixing state, the wagon side wall is located inside the receiving groove.

2. The railroad car welded fixture of claim 1 wherein, The clamping unit comprises a plurality of clamping assemblies symmetrically arranged along a first path on the fixing frame. The clamping assemblies are movable along the first path and are used to clamp and fix the wagon side wall. The switching unit comprises a switching driver and a transmission mechanism connected to the switching driver.

3. The railroad car welded fixture of claim 1 wherein, The transmission mechanism is also connected to the fixing frame. The switching driver drives the transmission mechanism to rotate or slide to control the fixing frame to switch between the receiving state and the fixing state. The transmission mechanism comprises a transmission gear connected to the switching driver. The switching driver controls the transmission gear to rotate around its own axis.

4. The railroad car welded fixture of claim 1 wherein, The transmission mechanism also comprises a transmission rack extending in the up-down direction and meshing with the transmission gear. The fixing frame is connected to the transmission rack. The transmission mechanism comprises a driving gear connected to the switching driver.

5. The railroad car welded fixture of claim 4 wherein, The switching driver controls the driving gear to rotate around its own axis. The transmission mechanism also comprises a driven gear connected to the fixing frame. The axis of the driven gear is parallel to the axis of the driving gear.

6. The railroad car welded fixture of claim 4 wherein, The transmission mechanism further comprises a transmission chain connected at the head and tail to the driving gear and the driven gear outside and meshing with the driving gear and the driven gear respectively. The transmission chain is used to drive the driven gear to rotate. The railway wagon welding fixing device further comprises an adjusting unit.

7. The railroad car welded fixture of claim 6 wherein, The adjusting unit comprises an adjusting driver and a walking assembly connected to the adjusting driver and connected to the fixing frame. The walking assembly is movable along a second path to adjust the position of the fixing frame on the second path. The second path is perpendicular to the first path. The walking assembly comprises a walking support and a walking wheel. The adjusting driver is fixed to the walking support. The walking support is also connected to the fixing frame. The walking wheel is rotationally connected to the walking support and connected to the adjusting driver. The adjusting driver is used to drive the walking wheel to rotate around its own axis. The axis of the walking wheel is parallel to the first path. The walking wheel abuts against the rack in the up-down direction. The adjusting unit further comprises a fine adjustment assembly. The fine adjustment assembly comprises a fine adjustment support and a fine adjustment mechanism. The adjusting driver and the walking assembly are arranged on the fine adjustment support. The fine adjustment mechanism is arranged on the fine adjustment support and connected to the fixing frame. The fine adjustment mechanism is used to drive the fixing frame to move along the first path. The fine adjustment mechanism comprises a fine adjustment driver and a fine adjustment lead screw. The fine adjustment driver is arranged on the fine adjustment support. The fine adjustment lead screw is parallel to the first path. The end of the fine adjustment lead screw is connected to the fine adjustment driver. The fixing frame is connected to the nut of the fine adjustment lead screw and slidingly connected to the fine adjustment support along the first path.

8. The railroad car welded fixture of claim 1 wherein, The clamping assembly comprises a clamping mechanism moving along the first path, the clamping mechanism being a telescopic member telescoping along the first path, or the clamping mechanism comprising a clamping driver, a clamping gear connected to the clamping driver, and a clamping rack connected to the clamping gear, the clamping rack extending along the first path and being used to abut against the side wall of the carriage.

9. The railroad car welded fixture of claim 8, wherein, The clamping assembly further comprises a lifting mechanism connected to the clamping mechanism, the lifting mechanism being used to drive the clamping mechanism to move in the up-down direction.

10. The railroad car welded fixture of claim 9, wherein, The lifting mechanism comprises: a lifting driver provided on the fixed frame; and a lifting screw rod parallel to the up-down direction, one end of the lifting screw rod being connected to the lifting driver, the other end of the lifting screw rod being connected to the fixed frame through a bearing, the clamping mechanism being connected to a nut of the lifting screw rod and being slidably connected to the fixed frame in the up-down direction.

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