A static pressure test adjustment method for a bogie with a swing arm positioning structure

Abstract

The present invention relates to a static pressure test adjustment method for a bogie with a swivel arm positioning structure, comprising the following steps: measuring the height of each spring seat before the bogie with the swivel arm positioning structure is completed; then, based on the height of each spring seat, adjusting pads are added to control the height difference at the four corners of the bogie with the swivel arm positioning structure within a preset range; the swivel arm node is fixedly connected under a static pressure test load condition AW0; and when performing air spring air tightness pressure maintenance testing, the displacement control system of the static pressure test bench weighing unit is set to fixed, and the hydraulic cylinder applying the load is set to fixed height control. Application of the present invention to the static pressure test adjustment method for a bogie with a swivel arm positioning structure ensures uniform compression of the tie springs at the four corners and uniform distribution of wheel load during static pressure test loading.

Description

Technical Field

[0001] The present invention relates to the technical field of EMU assembly, and in particular to a static pressure test adjustment method for a bogie with a rotating arm positioning structure. Background Art

[0002] When the bogie with the swing arm positioning structure is subjected to static pressure test, the influence of various parts of the bogie varies greatly. At present, there is no unified requirement and specification for the static pressure test process, and there are the following problems: 1. The frame spring seat of the swing arm positioning structure bogie is not processed, and the height difference of the four corners after welding is about 3mm. If it is assembled without treatment, the difference in wheel weight at the four points will be large, and it must be disassembled and adjusted at least once for each static pressure test; 2. The connection process flow of the swing arm node before the static pressure test is unreasonable, and the force conditions of the swing arm node are inconsistent, resulting in irregular changes in the results of each adjustment. There will also be a large difference between the static pressure test results (wheel weight and wheelbase) and the test results after assembly and unloading; the filling and loading servo control system of the bogie static pressure test bench is affected by the contraction and expansion force of the swing arm positioning structure bogie, and the empty spring pressure holding and filling pressure takes a long time to stabilize. Summary of the Invention

[0003] The present invention aims to solve the technical problems in the prior art and provides a static pressure test adjustment method for a bogie with a swing arm positioning structure.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0005] A static pressure test adjustment method for a bogie with a swivel arm positioning structure comprises the following steps:

[0006] Step i: Before the bogie with the pivot arm positioning structure is completed, the height of each spring seat is measured, and then, based on the height of each spring seat, the height difference of the four corners of the bogie with the pivot arm positioning structure is controlled within a preset range by adding adjustment pads;

[0007] Step ii: The boom joint is fixedly connected under the static pressure test load AW0 condition;

[0008] Step iii: When performing the air spring air tightness pressure holding test, the displacement control system of the static pressure test bench weighing unit is set to fixed.

[0009] In the above technical solution, after step iii, there is further provided:

[0010] Step iv: When performing wheel weight and wheelbase testing, the displacement control system of the static pressure test bench weighing unit is set to floating.

[0011] In the above technical solution, in step iii, when performing the air spring air tightness pressure maintenance test, the static pressure test bench weighing unit displacement control system is set to be fixed by:

[0012] The hydraulic cylinder that applies the load is set to a fixed height control.

[0013] In the above technical solution, the number of spring seats in step i is 4.

[0014] In the above technical solution, the spring seats in step i are all series spring seats.

[0015] In the above technical solution, in step i, the height difference of the four corners is controlled within 0.5 mm by adding adjustment pads.

[0016] The present invention has the following beneficial effects:

[0017] The static pressure test adjustment method of the bogie with a swivel arm positioning structure of the present invention standardizes the static pressure process of the bogie with a swivel arm positioning structure (assembly sequence and equipment function setting), reduces the number of disassembly and assembly and the air filling and pressure stabilization time during the static pressure test adjustment process of the bogie, and ensures the consistency of the static pressure test results with those after assembly and unloading.

[0018] The application of the static pressure test adjustment method for the bogie with a swing arm positioning structure of the present invention to measure, calculate and pre-pad adjustment can ensure that the wheel weight test is qualified in one go.

[0019] By applying the static pressure test adjustment method for the bogie with the swing arm positioning structure of the present invention, the man-hours for each bogie static pressure test can be reduced by 3 hours, which is not only economical but also can stabilize the static pressure test cycle time.

[0020] The bogie manufactured by the static pressure test adjustment method of the bogie with the swing arm positioning structure of the present invention has a reasonable process, eliminates the influence of the vehicle load factor, and the repeatability of the wheel weight and wheelbase detection results of the bogie static pressure test and the assembly weighing can reach 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 The figure is a schematic flow chart of the steps of the static pressure test adjustment method of the bogie with the swing arm positioning structure of the present invention. DETAILED DESCRIPTION

[0023] The inventive concept of the present invention is:

[0024] The static pressure test adjustment method of the bogie with the arm positioning structure of the present invention is as follows:

[0025] 1. Before the bogie is completed, the height difference of the four corners is controlled within 0.5mm through measurement, calculation and pre-shimming adjustment of the four corners to ensure uniform wheel weight difference at the four corners and reduce the number of bogie adjustment and disassembly times;

[0026] 2. The arm joint connection process is carried out under the static pressure load AW0 condition to ensure that the arm joint is not subjected to stress during each wheel weight adjustment test, and the influence of stress on the wheel weight is close to zero, thereby improving the consistency of the wheel weight and wheelbase test results in the static pressure test and assembly weighing stages;

[0027] 3. The requirements for the floating and fixed state settings of the static pressure test bench weighing unit: When the empty spring is holding pressure, it must be set to fixed (at the same time, the hydraulic cylinder applying the load is set to height fixed control) to eliminate the impact of the wheelbase change of the bogie structure on the inflation pressure servo control system and shorten the inflation pressure stabilization time;

[0028] In addition, the wheel weight and wheelbase detection must be set to floating to ensure that the displacement of the weighing unit is consistent with the changes in the wheelset.

[0029] The present invention will be described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the static pressure test adjustment method of the bogie with a rotating arm positioning structure of the present invention comprises the following steps:

[0031] Step i: Before the bogie with the pivot arm positioning structure is completed, the heights of the four primary spring seats are measured, and then, based on the height of each primary spring seat, the height difference of the four corners of the bogie with the pivot arm positioning structure is controlled within 0.5 mm by adding adjustment pads;

[0032] Step ii: The boom joint is fixedly connected under the static pressure test load AW0 condition;

[0033] Step iii: When performing the air spring air tightness pressure holding test, the static pressure test bench weighing unit displacement control system is set to fixed, and the hydraulic cylinder applying the load is set to height fixed control;

[0034] Step iv: When performing wheel weight and wheelbase testing, the displacement control system of the static pressure test bench weighing unit is set to floating.

[0035] The static pressure test adjustment method of the bogie with the arm positioning structure of the present invention is further described in detail.

[0036] The present invention's method for adjusting the arm positioning structure during a static pressure test of a bogie involves measuring the heights of the frame's four primary spring seats (i.e., the distance from the primary spring seat to the axle centerline) before the bogie is completed. Adjustment shims are then added or the heights of the four primary springs are adjusted to within 0.5 mm of each other. This ensures uniform compression of the primary springs at the four corners and even distribution of wheel loads during the static pressure test.

[0037] At present, there are two forms of bogie frames with arm positioning structures: the lower end face of the cap barrel is not processed and the lower end face is processed (process improvement for the convenience of measurement). The processed form means that the lower end face of the cap barrel is processed with respect to the lower end face of the arm positioning seat to increase the relative reference.

[0038] Each fixed connection of the swing arm node is required to be carried out under the static pressure test load AW0 condition. This ensures that during each wheel weight adjustment test of the bogie, the swing arm node is not stressed after being fixed, so that the influence of the swing arm node stress on the wheel weight is close to 0. This ensures that the sprung load conditions during the static pressure test and assembly weighing of the bogie are close to equal. At this time, the swing arm node is basically free of stress, which minimizes the impact on the wheel weight and wheelbase test results.

[0039] When the air spring air tightness holding pressure test is performed on a static pressure test bench for a bogie with a swing arm positioning structure, the static pressure test bench weighing unit displacement control system setting requirements are as follows: the air spring must be set to fixed during pressure holding (and the hydraulic cylinder applying the load must be set to height fixed control). This eliminates the impact of the bogie's wheelbase changes on the air filling pressure servo control system and shortens the air filling pressure stabilization time.

[0040] The wheel weight and wheelbase detection must be set to floating to ensure that the displacement detection of the weighing unit is synchronized with the change of the wheelset wheelbase.

[0041] The static pressure test adjustment method of the bogie with a swivel arm positioning structure of the present invention standardizes the static pressure process of the bogie with a swivel arm positioning structure (assembly sequence and equipment function setting), reduces the number of disassembly and assembly and the air filling and pressure stabilization time during the static pressure test adjustment process of the bogie, and ensures the consistency of the static pressure test results with those after assembly and unloading.

[0042] The application of the static pressure test adjustment method for the bogie with a swing arm positioning structure of the present invention to measure, calculate and pre-pad adjustment can ensure that the wheel weight test is qualified in one go.

[0043] By applying the static pressure test adjustment method for the bogie with the swing arm positioning structure of the present invention, the man-hours for each bogie static pressure test can be reduced by 3 hours, which is not only economical but also can stabilize the static pressure test cycle time.

[0044] The bogie manufactured by the static pressure test adjustment method of the bogie with the swing arm positioning structure of the present invention has a reasonable process, eliminates the influence of the vehicle load factor, and the repeatability of the wheel weight and wheelbase detection results of the bogie static pressure test and the assembly weighing can reach 100%.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A static pressure test adjustment method for a bogie with a turret arm positioning structure, characterized in that: The following steps are involved: Step i: Before the bogie with the pivot arm positioning structure is completed, the height of each spring seat is measured, and then, based on the height of each spring seat, the height difference of the four corners of the bogie with the pivot arm positioning structure is controlled within a preset range by adding adjustment pads; Step ii: The boom joint is fixedly connected under the static pressure test load AW0 condition; Step iii: When performing the air spring air tightness pressure holding test, the displacement control system of the static pressure test bench weighing unit is set to fixed.

2. The static pressure test adjustment method for a bogie with a turret arm positioning structure according to claim 1, characterized in that: After step iii, there is also: Step iv: When performing wheel weight and wheelbase testing, the displacement control system of the static pressure test bench weighing unit is set to floating.

3. The static pressure test adjustment method for a bogie with a turret arm positioning structure according to claim 1 or 2, characterized in that: In step iii, when performing the air spring air tightness pressure maintenance test, the static pressure test bench weighing unit displacement control system is set to fixed by: The hydraulic cylinder that applies the load is set to a fixed height control.

4. The static pressure test adjustment method for a bogie with a turret arm positioning structure according to claim 1 or 2, characterized in that: The number of spring seats in step i is 4.

5. The static pressure test adjustment method for a bogie with a turret arm positioning structure according to claim 1 or 2, characterized in that: The spring seats in step i are all spring seats.

6. The static pressure test adjustment method for a bogie with a turret arm positioning structure according to claim 1 or 2, characterized in that: In step i, the height difference of the four corners is controlled within 0.5 mm by adding adjustment pads.

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