Railway container flat car locking device assembling and positioning system and positioning method

Abstract

The invention discloses an assembling and positioning system and method for a railway container flat car locking device. The assembling and positioning system comprises a supporting platform used for supporting a bottom frame, a pair of supporting iron horses and eight sets of rotary positioning arms. The supporting iron horse is used for being combined with the two center plates of the container flatcar underframe respectively and being positioned, supported and fixed, and the rotary positioning arm is used for positioning the positions of the locking devices. According to the system and the assembling method, the unification of the positioning reference of a container flat car and the positioning reference of an assembling device is effectively achieved, a cross laser ray is adopted as the positioning reference of a lock seat frame to achieve rapid initial positioning of a locking device, and finally the lock head sample punching hole position is directly positioned through a lock head sample punching hole positioning pin; accurate positioning of the locking device in the length direction and the width direction is achieved; the system is provided with a reading pointer with height scale marks on a lock positioning pin, so that the height difference of the bearing surfaces of the locking devices can be directly read, and the height adjustment of the locking devices can be conveniently guided; the system and the application method thereof can effectively improve the assembly efficiency and control the assembly quality.

Description

Technical Field

[0001] This invention belongs to the field of railway vehicle manufacturing equipment design technology, and more particularly to the field of railway vehicle installation auxiliary equipment design technology. Specifically, it relates to an assembly and positioning device and positioning method for a railway container flatcar locking device. Background Technology

[0002] The locking device of a railway container flatcar consists of a lock seat and lock heads. A typical container flatcar has eight locking devices. The locking device is divided into two areas by the transverse centerline of the car body. Each area consists of four locking devices for transporting 20-foot containers, while the four locking devices at the front and rear of the car body are used for transporting 40-foot containers. To ensure flexible loading and unloading operations and transportation safety on railway container flatcars, high precision is required in the assembly of the locking device. Specifically, the height difference of the bearing surface of the lock seat used for the same container must be ≤6mm. The width and length of the eyelets between lock heads, as well as the diagonal of the center of the eyelets for each set of container lock heads, all have assembly tolerance requirements. These are key areas for quality control in the production of container flatcars.

[0003] Because the eight locking devices are distributed widely across the container flatcar, and the flatcar chassis exhibits deflection and lateral bending with significant dimensional deviations between the end beams and side beams, using the flatcar chassis as the assembly reference cannot meet the precision requirements for the locking devices. Furthermore, the locking device consists of a lock seat and a lock head, with a 2-3mm gap between the lock head and the lock seat. The lock seat is a casting, and its frame is not machined; using the lock seat frame as the assembly reference also results in dimensional errors.

[0004] There are three main ways to assemble existing container locking devices.

[0005] The locking device uses an integral assembly template rod assembly, with its positioning references mainly being the side beams, end beams, and lock seat frame of the container flatcar chassis. The main problems are: large size, occupying production space; heavy weight, requiring overhead crane operation, resulting in low production efficiency; adjusting the lead screw to make the template rod positioning surface contact the end and side beams of the container flatcar chassis, leading to low work efficiency and high labor intensity; and the use of the lock seat frame frame as the assembly reference introduces assembly dimensional errors.

[0006] The process involves assembling a small steel structure within the container flatcar chassis. The longitudinal and transverse centerlines of the small steel structure are aligned with those of the container flatcar chassis. A laser array on the small steel structure is then used to determine the positions of the end beams and the centerline of the lock head. Finally, a lock seat positioning component is installed to complete the locking device assembly. The main problems include: heavy weight requiring overhead crane operation and low production efficiency; difficulty and inefficiency in aligning the small steel structure with the container flatcar chassis's longitudinal and transverse centerlines; reduced positioning accuracy due to long-distance laser divergence; potential errors in the interaction between the laser intersection point and the positioning component; and dimensional errors in assembly due to using the lock seat frame as the assembly reference.

[0007] The installation positions of the four locking devices near the end beams were determined by marking lines and using a template to measure the dimensions of the four locking devices in the middle section. Problems included: the assembly quality was significantly affected by human factors due to the use of a measuring tape; and the installation positions of the locking devices required repeated adjustments during assembly, resulting in low assembly efficiency. Summary of the Invention

[0008] This invention discloses a positioning system and method for assembling locking devices on railway container flatcars, addressing the shortcomings of existing technologies. The purpose of this invention is to provide a positioning system and method for assembling locking devices on railway container flatcars that can effectively improve positioning and assembly efficiency and control positioning and assembly quality.

[0009] This invention is achieved through the following technical solution:

[0010] The present invention discloses an assembly and positioning system for a locking device of a railway container flatcar, comprising: a base support platform for supporting and fixing the base frame of the railway container flatcar, characterized in that: the positioning system further comprises a pair of support iron horses and eight sets of rotating positioning arms;

[0011] A pair of support blocks are fixedly installed at both ends of the underframe support platform to connect with and position the two core plates of the container flatcar underframe; including: Block 1, which consists of Block 1 base and a horizontally arranged core plate positioning surface and a core plate tangent circle positioning stop set on Block 1 base; Block 2, which consists of Block 2 base and a horizontally arranged core plate positioning surface and a core plate hole positioning pin set on Block 2 base;

[0012] Eight sets of rotary positioning arms are fixedly installed on the outer sides of the corresponding positions of each locking device on both sides of the underframe support platform to locate the position of each locking device. The rotary positioning arm assembly includes a rotary shaft assembly, a rotary arm assembly, a guide sleeve, and a lock head positioning pin. The rotary shaft assembly is a supporting column, with its top rotatably hinged to one end of the rotary arm assembly. The other end of the rotary arm assembly is vertically provided with a cylindrical guide sleeve, into which the lock head positioning pin can be inserted for positioning and fixation. The tip of the bottom end of each lock head positioning pin is the corresponding locking head positioning point of the locking device. A cross laser emitter that emits a cross laser line vertically downward is provided on the inner side of the rotary arm assembly. The position where the cross laser line falls on the surface of the railway container flatcar underframe is the positioning line of the locking device frame.

[0013] Furthermore, the rotary arm assembly is positioned and locked, and can be opened and closed; the positioning and fixing lock is set below each rotary arm assembly, and consists of a positioning plate and a locking fastener; the positioning plate has an L-shaped support positioning surface, which is used to support the rotary arm assembly. When the rotary arm assembly is fixed on the L-shaped support positioning surface, the tip of the bottom of its end lock head positioning pin is the corresponding locking head positioning point of the locking device, and the position of the cross laser line emitted by the cross laser emitter on the surface of the railway container flatcar underframe is the positioning line of the locking device frame; the locking fastener is a screw-type openable and closable fastener, which is hinged to the positioning plate and used to press and fix the rotary arm assembly.

[0014] Furthermore, the lock head positioning pin and the guide sleeve can be inserted into a clearance fit; the lock head positioning pin is cylindrical with a pointed end, and a reading pointer indicating the axial position of the lock head positioning pin is provided on the outer wall of the cylinder along the axial direction.

[0015] Furthermore, a lock head installation direction indicator is also provided on the side of the end of the rotary arm assembly.

[0016] Furthermore, the base support platform is a steel truss structure support platform, with eight sets of rotating positioning arms and positioning and fixing locks set on the top surface platform of the main column on the outer side of the corresponding locking devices on both sides of the base support platform.

[0017] The present invention further discloses a method for assembling and positioning a railway container flatcar locking device on the above-mentioned positioning system, comprising the following steps:

[0018] S1 hoists the container flatcar chassis into the chassis support platform. One end of the center plate falls into the center plate hole positioning pin on the second iron horse, and the other end of the center plate falls into the outer tangent circle positioning stop of the first iron horse, and contacts the positioning surfaces of the two iron horse center plates, thus completing the positioning of the container flatcar chassis.

[0019] S2 rotates the rotary positioning arm assembly into the container flatcar underframe until it is in contact with the positioning surface of the positioning and fixing lock, flips the locking fastener upward and adjusts the bolts to press the rotary arm assembly, thereby achieving the positioning of the rotary positioning arm assembly;

[0020] S3 activates the cross laser emitter, projecting the cross laser line onto the flatbed plane of the container flatcar.

[0021] S4 Place each locking device on the container flatcar underframe and align the locking device frame with the cross laser line to complete the initial positioning of the locking device installation.

[0022] S5 inserts the lock head positioning pin along the guide sleeve, and the lock head positioning pin falls freely along the guide sleeve. The top part of its bottom end contacts the lock head surface of the locking device below by gravity.

[0023] If the tip of the lock positioning pin falls completely into the pre-machined punch hole on the surface of the lock, it indicates that the current position of the lock meets the requirements and subsequent work can proceed.

[0024] If it is observed that the top of the locking head positioning pin fails to fall into the punch hole, or only partially falls in, then there is a deviation in the position of the locking head. At this time, the locking device is slightly adjusted by translation or rotation until the top of the locking head positioning pin falls completely into the punch hole of the locking head to achieve positioning.

[0025] S6 uses the reading pointer of the lock head positioning pin to confirm whether the height difference of each lock seat platform surface is ≤6mm; if the height difference of the lock seat platform surface is ≥6mm, the height needs to be adjusted; if the height difference of the lock seat platform surface is ≤6mm, the lock seat is spot welded to complete the assembly.

[0026] In step S4, each locking device is placed according to the direction indicated by the lock head installation direction sign.

[0027] This invention system unifies the positioning references for container flatcars and assembly devices, eliminating assembly quality problems caused by positioning reference deviations. By setting an initial positioning reference, namely the crosshair laser beam as the positioning reference for the lock seat frame, the locking device can be quickly positioned in the assembly position, improving assembly efficiency. By setting a final positioning reference, namely using the lock head punch positioning pin to directly position the lock head punch, the assembly accuracy and efficiency are improved.

[0028] This invention's system and assembly method effectively solve the problem of unifying the positioning reference of the container flatcar with that of the assembly device. It uses a cross-shaped laser beam as the positioning reference for the lock seat frame to achieve rapid initial positioning of the locking device. Finally, the locking head punch is used to directly position the locking head punch, achieving precise positioning of the locking device in both length and width directions. The system features a height scale reading pointer on the locking head positioning pin, allowing direct reading of the height difference between the bearing surfaces of each locking device, facilitating height adjustment guidance. This invention and its application method effectively improve assembly efficiency and control assembly quality. Attached Figure Description

[0029] Figure 1This is a top view of the positioning system of the container flatcar locking device of the present invention.

[0030] Figure 2 This is a side view of the positioning system of the container flatcar locking device of the present invention.

[0031] Figure 3 This is a schematic diagram of the positioning system for the iron horse of the present invention.

[0032] Figure 4 This is a schematic diagram of the positioning system of the present invention.

[0033] Figure 5 This is a schematic diagram of the rotary positioning arm of the positioning system of the present invention.

[0034] Figure 6 yes Figure 5 Schematic diagram of section AA.

[0035] Figure 7 This is a schematic diagram of the cross laser emitter of the positioning system of the present invention.

[0036] Figure 8 This is a schematic diagram of the positioning pin of the positioning system of the present invention.

[0037] Figure 9 This is a schematic diagram of the rotary positioning arm fixing lock of the positioning system of the present invention.

[0038] In the diagram, 1 is Iron Horse One, 2 is Iron Horse Two, 3 is a cross laser emitter, 4 is a rotating positioning arm assembly, 5 is a positioning and fixing lock, 6 is a base support platform, 11 is the base of Iron Horse One, 12 is the positioning stop of the outer tangent circle of the mandrel, 13 is the positioning surface of the mandrel one, 21 is the base of Iron Horse Two, 22 is the positioning pin of the mandrel hole, 23 is the positioning surface of the mandrel two, 41 is a rotating shaft assembly, 42 is a rotating arm assembly, 43 is a guide sleeve, 44 is a lock head positioning pin, 45 is a lock head installation direction indicator, 46 is a reading pointer, 51 is a positioning plate, 52 is a locking fastener, 53 is a positioning surface, G is a laser line, S is a locking device, D is a lock head punch, H is the vertical distance between the rotating positioning arm and the Iron Horse base, and Z is the longitudinal and transverse center lines of the container flatcar. Detailed Implementation

[0039] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principles of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the scope of protection of the present invention.

[0040] Refer to the attached diagram.

[0041] As shown in the figure, a railway container flatcar locking device assembly and positioning system includes: a base support platform 6 for supporting and fixing the railway container flatcar base frame; the positioning system also includes a pair of support iron horses and eight sets of rotary positioning arms 4.

[0042] A pair of support blocks are fixedly installed at both ends of the underframe support platform 6, for connecting and positioning the two core plates of the container flatcar underframe respectively; including: Block 1, which consists of Block 1 base 11 and a horizontally arranged core plate positioning surface 12 and a core plate circumferential positioning stop 13 arranged on Block 1 base 11; Block 2, which consists of Block 2 base 21 and a horizontally arranged core plate positioning surface 23 and a core plate hole positioning pin 22 arranged on Block 2 base 21;

[0043] Eight sets of rotary positioning arms 4 are fixedly installed on the outer side of the corresponding positions of each locking device S on both sides of the base support platform 6, and are used to position each locking device S. The rotary positioning arm 4 includes a rotary shaft assembly 41, a rotary arm assembly 42, a guide sleeve 43, and a lock head positioning pin 44. The rotary shaft assembly 41 is a support column, and its top is rotatably hinged to one end of the rotary arm assembly 42. The other end of the rotary arm assembly 42 is vertically provided with a cylindrical guide sleeve 43. The lock head positioning pin 44 can be inserted into the guide sleeve 43 for positioning and fixing. The bottom tip of each lock head positioning pin 44 is the corresponding lock head positioning point of the locking device S. A cross laser emitter 3 that emits a cross laser line G vertically downward is provided on the inner side of the rotary arm assembly 42. The position of the cross laser line G on the surface of the railway container flatcar base is the positioning line of the locking device S frame.

[0044] The slewing arm assembly 42 is positioned and can be opened and closed by the positioning and fixing lock 5. The positioning and fixing lock 5 is set below each slewing arm assembly 42 and consists of a positioning plate 51 and a locking fastener 52. The positioning plate 51 has an L-shaped support positioning surface 53. The L-shaped support positioning surface 53 is used to support the slewing arm assembly 42. When the slewing arm assembly 42 is fixed on the L-shaped support positioning surface 53, the bottom tip of the locking pin 44 at its end is the corresponding locking point of the locking device S. The position of the cross laser line G emitted by the cross laser emitter 3 on the surface of the railway container flatcar underframe is the positioning line of the locking device S frame. The locking fastener 52 is a screw-type opening and closing fastener that can be flipped and hinged on the positioning plate 51 and is used to press and fix the slewing arm assembly 42.

[0045] The lock head positioning pin 44 and the guide sleeve 43 can be inserted into a clearance fit; the lock head positioning pin 44 is cylindrical with a pointed end, and a reading pointer 46 indicating the axial position of the lock head positioning pin is provided on the outer wall of the cylinder along the axial direction.

[0046] The end side door of the slewing arm assembly 42 is also equipped with a lock installation direction indicator 45.

[0047] The base support platform 6 is a steel truss structure support platform. Eight sets of rotating positioning arms 4 and positioning and fixing locks 5 are set on the top surface of the main column on the outer side of the corresponding position of each locking device S on both sides of the base support platform 6.

[0048] like Figure 1 , Figure 3 , Figure 4 As shown, a pair of positioning iron horses are set on the underframe support platform 6. Iron horse 1 positions the outer tangent circle and horizontal support of the container flatcar center plate, and iron horse 2 positions the center hole and horizontal support of the container flatcar center plate. The two sets of iron horses work together to achieve horizontal height positioning and longitudinal and transverse positioning of the container flatcar underframe.

[0049] like Figure 1 , Figure 2 , Figure 5 As shown, eight sets of rotary positioning arms 4 are installed on the outside of the base support platform 6. Each set of rotary positioning arms 4 is equipped with a lock head positioning pin 44 and a lock head installation direction indicator 45. In the assembled state, the relative positions of the tips of the eight lock head positioning pins 44 are consistent with the relative dimensions of the center of the locking device S.

[0050] like Figure 1 , Figure 5 As shown, a cross laser emitter 3 is installed on the rotary positioning arm assembly 4. In this example, six sets are installed. Arranged with the center of the locking pin 44 as the reference, the two laser lines G of the cross laser emitter 3 are aligned with the two sides of the locking device S, and the two laser lines G are parallel to the longitudinal and transverse center lines Z of the container flatcar. Figure 5 As shown, the outer frame of the locking device S is positioned by ray positioning to achieve the initial positioning of the locking device S during installation, which facilitates the rapid assembly of the locking device S; at the same time, it can also ensure that the outer frames of the eight locking devices S are installed in a straight line in both the longitudinal and transverse directions.

[0051] Installation and positioning process:

[0052] 1. Hoist the container flatcar chassis onto the chassis support platform 6. One end of the center plate falls into the center plate hole positioning pin 22 on the iron horse 2, and the other end of the center plate falls into the outer tangent circle positioning stop 12 of the iron horse 1, and contacts the two iron horse center plate support surfaces to complete the positioning of the container flatcar chassis.

[0053] 2. Rotate the rotary positioning arm assembly 4 into the container flatcar underframe until it is in contact with the positioning surface 53 of the rotary positioning arm fixing lock 5, flip the locking fastener assembly 52 upward and adjust the bolts to press the rotary arm assembly 42, thereby achieving the positioning of the rotary positioning arm assembly 4.

[0054] 3. Turn on the switch of the cross laser emitter 3 to project the ray onto the flat surface of the container flatcar chassis.

[0055] 4. Place the locking device S on the container flatcar underframe according to the 45-degree direction indicator on the lock head installation sign, and align the frame of the locking device S with the cross laser line G to complete the initial positioning of the locking device S installation.

[0056] 5. The lock head positioning pin 44 is inserted along the guide sleeve 43 and falls freely along the guide sleeve 43. The tip of the pin at its bottom contacts the lock head surface of the locking device S below due to gravity. If the tip of the lock head positioning pin 44 can fall completely into the pre-machined punch hole D on the lock head surface, it indicates that the current position of the lock head meets the requirements and subsequent work can proceed. If it is observed that the tip of the lock head positioning pin 44 fails to fall into the punch hole D, or only partially falls in, such as the tip getting stuck at the edge of the hole or hanging in the air, it indicates that there is a deviation in the lock head position. At this time, a slight position adjustment of the locking device S is required, such as translation or rotation, until the tip of the lock head positioning pin 44 falls completely into the lock head punch hole D to achieve precise positioning.

[0057] 6. Use the reading pointer 46 of the lock head positioning pin 44 to confirm whether the height difference of each lock seat platform surface is ≤6mm. If the height difference of the lock seat platform surface is ≤6mm, spot weld the lock seats to complete the assembly; if the height difference of the lock seat platform surface is ≥6mm, the height needs to be adjusted before spot welding the lock seats to complete the assembly.

[0058] The railway container flatcar locking device assembly and positioning system of this invention positions the height of the container flatcar by using the support surface of the iron horse. It achieves planar positioning of the container flatcar through a set of iron horse positioning center holes and a set of iron horse positioning center outer tangent circles and edge positioning; the combination of points and edges determines the planar position of the container flatcar. After the spatial positioning of the container flatcar underframe is determined, the spatial positions of the eight sets of locking devices S distributed on the reference box are also determined.

[0059] When the locking device S is installed, the longitudinal and transverse center lines of the base support platform 6 of the railway container flatcar locking device assembly and positioning system of the present invention coincide with the projection of the longitudinal and transverse center lines of the container flatcar base frame onto the horizontal plane.

[0060] In the assembly and positioning system of the railway container flatcar locking device of this invention, the top of the locking pin 44 in the rotary positioning arm component 4 coincides with the projection of the locking head punch D of the locking device S on the horizontal plane during installation. Fixing and locking the rotary positioning arm positioning lock 5 at this position ensures that the top of the locking pin 44 is fixed during assembly.

[0061] The railway container flatcar locking device assembly and positioning system of this invention uses a positioning reference composed of the top of the locking head positioning pin 44 and two laser lines G of the cross laser emitter 3, which correspond to the position of the locking head punch D (lock center) and the two sides of the locking device S, respectively. Since the locking device S itself has assembly gaps and tolerances, and the dimensions marked on the drawings are the relative dimensions of the center of the locking head punch D, this invention uses the top of the locking head positioning pin 44 to accurately position the locking head punch D, and then uses the two laser lines G of the cross laser emitter 3 to initially position the frame of the locking device S, so as to achieve rapid assembly (initial positioning, with the laser line G as the initial installation position of the locking device S) and accurate positioning (final positioning, the top of the locking head positioning pin 44 falls into the punch D).

Claims

1. A railway container flatcar locking device assembly positioning system, comprising: A chassis support platform for supporting and fixing a railway container flat car chassis, characterized in that the positioning system further comprises a pair of support iron horses and eight groups of rotary positioning arm assemblies; The pair of support iron horses are fixedly arranged at the two ends of the chassis support platform, and are used for being combined with and fixedly supporting and positioning the two center plates of the container flat car chassis respectively; the iron horse one is composed of an iron horse one base, a horizontally arranged center plate one positioning surface and a center plate outer circle positioning stopper arranged on the iron horse one base; and the iron horse two is composed of an iron horse two base, a horizontally arranged center plate two positioning surface and a center plate hole positioning pin arranged on the iron horse two base. The eight groups of rotary positioning arm assemblies are fixedly arranged outside the corresponding positions of each locking device on the two sides of the chassis support platform, and are used for positioning the positions of each locking device; the rotary positioning arm assembly comprises a rotary shaft assembly, a rotary arm assembly, a guide sleeve and a lock head positioning pin; the rotary shaft assembly is a support column, the top of which is rotatably connected with one end of the rotary arm assembly, the other end of the rotary arm assembly is vertically arranged in a cylindrical guide sleeve, the lock head positioning pin can be inserted into the guide sleeve for positioning and fixing, and the bottom end of the sharp part of each lock head positioning pin is a lock head positioning point of the corresponding locking device; a cross laser emitter vertically downward emitting a cross laser line is arranged on the inner side of the rotary arm assembly, and the position where the cross laser line falls on the surface of the railway container flat car chassis is a positioning line of the frame of the locking device.

2. The railway container flatcar locking device assembly positioning system of claim 1, wherein: The rotary arm assembly is positioned and fixed by the positioning and fixing lock, and can be opened and closed; the positioning and fixing lock is arranged below each group of rotary arm assemblies, and is composed of a positioning plate and a locking fastener; the positioning plate has an L-shaped support positioning surface, which is used for supporting the rotary arm assembly; when the rotary arm assembly falls on the L-shaped support positioning surface and is fixed, the bottom end of the sharp part of the end lock head positioning pin is a lock head positioning point of the corresponding locking device, and the cross laser line emitted by the cross laser emitter falls on the surface of the railway container flat car chassis, and the position is a positioning line of the frame of the locking device; the locking fastener is a screw rod openable and closable fastener, which is reversibly connected to the positioning plate, and is used for pressing and fixing the rotary arm assembly.

3. The railway container flat car locking device assembly positioning system of claim 2, wherein: The lock head positioning pin and the guide sleeve can be inserted into the gap; the lock head positioning pin is cylindrical, and the bottom end is provided with a sharp part; and the cylindrical outer wall is provided with a reading pointer for indicating the axial position of the lock head positioning pin.

4. The railway container flat car locking device assembly positioning system of claim 2, wherein: The end side surface of the rotary arm assembly is further provided with a lock head installation direction indicator.

5. The railway container flat car locking device assembly positioning system of claim 2, wherein: The chassis support platform is a steel truss structure support platform, and the eight groups of rotary positioning arm assemblies and the positioning and fixing lock are arranged on the top surface of the main column outside the corresponding positions of each locking device on the two sides of the chassis support platform.

6. A method of assembling and positioning a railway container flat car locking device, comprising: The assembly positioning is performed on the positioning system according to any one of claims 1 to 5, and comprises the following steps: S1: hoisting the container flat car chassis onto the chassis support platform, with one end of the center plate falling into the center plate hole positioning pin on the iron horse two, and the other end of the center plate falling into the outer circle positioning stopper of the iron horse one and contacting the two center plate positioning surfaces of the iron horses, so as to complete the positioning of the container flat car chassis; S2: rotating the rotary positioning arm assembly to be in contact with the positioning surface of the positioning and fixing lock, and then reversibly turning the locking fastener and adjusting the bolt to press the rotary arm assembly, so as to realize the positioning of the rotary positioning arm assembly. S3 Turn on the cross laser emitter to project the cross laser line to the flat surface of the flat wagon chassis; S4 Place each locking device on the flat wagon chassis respectively, and align the frame of the locking device with the cross laser line to complete the initial positioning of the locking device installation; S5 Put the lock head positioning pin into the guide sleeve, and the bottom end of the top part of the lock head positioning pin falls freely and contacts the surface of the lock head of the locking device below by gravity; If the top of the lock head positioning pin falls completely into the sample punched hole pre-processed on the lock head surface, it means that the current position of the lock head meets the requirements, and the subsequent work can be carried out; If it is found by observation that the top of the lock head positioning pin cannot fall into the sample punched hole or only partially falls into it, the position of the lock head is deviated; At this time, the locking device is slightly adjusted in position by translation or rotation until the top of the lock head positioning pin completely falls into the sample punched hole of the lock head to realize positioning. S6 Confirm whether the height difference of the bearing surface of each lock seat is ≤6mm through the reading pointer of the lock head positioning pin; If the height difference of the bearing surface of the lock seat is ≥6mm, the height needs to be adjusted; If the height difference of the bearing surface of the lock seat is ≤6mm, the lock seat is spot welded to complete the assembly.

7. The method of claim 6, wherein: In the step S4, each locking device is placed according to the direction of the lock head installation direction indicator.

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