Lineation method for triangular plate of electric locomotive and auxiliary device of lineation method

Abstract

The invention discloses a marking method for a triangular plate of an electric locomotive and an auxiliary device thereof. The marking method comprises the following steps: determining a Z-direction plate body center line and size boundaries of a large end mounting hole and a small end mounting hole; determining the machining size boundaries of the large and small end faces in the X direction and the center line of the plate body in the direction; comprising the step of determining size boundaries of large and small end mounting holes in the Y direction by using an auxiliary device. Clamping and fixing are not needed in the scribing process, one third of the scribing time can be saved, the scribing precision is high through the auxiliary device, operation is easy, and the production cost is reduced. According to the method, in a three-dimensional space in mechanical engineering, three-dimensional lineation of an overturning set square in three directions is converted into spatial dimension conversion of three spatial dimensions. A square box is used for assisting, a horizontal ruler is used for measuring and locking the size, and plane scribing is carried out in two directions to complete the scribing process. And potential safety hazards caused by overturning the triangular plate in the third direction of three-dimensional scribing are eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of marking technology, in particular to a marking method for a triangle plate of an electric locomotive and an auxiliary device thereof. Background Art

[0002] The existing technology is to mark the size limits of the large and small end mounting holes of the set plate and the size limits of the large and small end end faces by three-dimensional marking, as well as the reference line for clamping and positioning on the machine tool.

[0003] The traditional marking method is to use mathematical calculations and dimension accumulation to flip the triangle plate body to mark the size limits in three directions and the reference line in that direction. First, support the triangle plate horizontally on three adjustable jacks, adjust the jacks to align the horizontal Z direction so that it is in a reasonable position, mark the size limits of the large and small end mounting holes and the center line of the triangle plate body. Then, support the triangle plate sideways on three adjustable jacks, align the center line drawn in the Z direction as the reference line and the X direction of the triangle plate body, and mark the size limits of the large and small end faces and the center line in that direction. Finally, stand the triangle plate upright. Since the end face of the small end as the support point is an arc surface, it cannot be used as a reliable support point. Only one support point can be set on each of the arc surfaces of the two small ends, and then lean on the vertical plate, set three support points on the vertical plate, and adjust the two adjustable jacks supported on the arc surface of the small end and the three adjustable jacks on the vertical plate according to the center lines of the first two directions. After alignment, use a pressure plate to pre-tighten and press. Mark the size boundaries of the large and small end mounting holes.

[0004] This method has low scribing efficiency, long process cycle and high labor cost. In addition, in the process of turning over the plate and determining the supporting structure, the plate is prone to collapse due to the instability of the supporting structure, which poses a safety hazard. Summary of the invention

[0005] The present invention aims to solve the problems of low operating efficiency, long process cycle, high labor cost and potential safety hazards of the flip plate in the three-dimensional scribing space in the prior art. The three-dimensional space in mechanical engineering is creatively transformed from the three-dimensional scribing of the flip set plate in three directions to the spatial dimension conversion of the three dimensions of the space. The method transforms the three-dimensional scribing in three directions performed by flipping the set plate into the scribing process completed by plane scribing in two directions with the assistance of a vertical plate, measuring and locking the size with a horizontal ruler.

[0006] To achieve the above object, the present invention is implemented by the following technical scheme. A method for marking a triangle plate of an electric locomotive and its auxiliary device. It includes the following steps:

[0007] S1: Draw the center line of the plate in the Z direction and the size limits of the large and small end mounting holes;

[0008] S2: Draw the center line of the plate in the X direction and the size limits of the large and small end faces;

[0009] S3: Use the auxiliary device horizontal ruler and vertical plate to mark the size boundaries of the large and small end mounting holes in the Y direction.

[0010] In the step S1: determination of the dimension value in the Z direction:

[0011] Support the triangle plate horizontally on three adjustable jacks, adjust the jacks to make the triangle plate in a horizontal position, divide the plate body in half, and use a marking disk to mark the center line of the triangle plate body as the reference line in that direction. Mark the size limits of the large and small end mounting holes.

[0012] In step S2: Determination of the dimension value in the X direction:

[0013] The triangle plate is supported sideways on three adjustable jacks. The large and small ends welded on the triangle plate body are at different heights from the marking platform used as the reference plane. Therefore, the support structure needs to be equipped with shims to increase the height. Place the adjustable jack on the shim, adjust the jack, use a square and a marking disk to align the center line drawn in the Z direction and the X direction of the plate body, use the marking disk to divide the X-direction dimension c of the triangle plate body in half, draw the center line in this direction with the c / 2 dimension value and use it as the coordinate zero point, loosen the locked marking needle on the marking disk, move it to the height gauge, align the a / 2 dimension value and lock it, and mark the processing dimension limit on the upper surface of the large end. Loosen the locked marking needle on the marking disk, move it to the height gauge, align the -a / 2 dimension value and lock it, and mark the processing dimension limit on the lower surface of the large end.

[0014] Loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of s / 2 and lock it, and mark the center line of the end face of the upper small end. Loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of (s+b) / 2 and lock it, and mark the machining dimension limit of the upper surface of the upper small end. Loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of (sb) / 2 and lock it, and mark the machining dimension limit of the lower surface of the upper small end.

[0015] Loosen the locked marking needle on the marking disc, move it to the height gauge, align it downward to the -s / 2 dimension value and lock it, and mark the center line of the end face of the lower small end. Loosen the locked marking needle on the marking disc, move it to the height gauge, align it downward to the -(sb) / 2 dimension value and lock it, and mark the machining dimension limit of the upper surface of the lower small end. Loosen the locked marking needle on the marking disc, move it to the height gauge, align it downward to the -(s+b) / 2 dimension value and lock it, and mark the machining dimension limit of the lower surface of the lower small end.

[0016] In step S3: Determination of the Y-direction dimension value

[0017] When marking the Y-direction dimension value, the horizontal ruler and the vertical plate are used to assist, so that the original three-dimensional marking that requires flipping the triangle plate body can be transformed into a three-dimensional transformation. The marking operation in three supporting directions can be completed in two supporting directions.

[0018] Move the horizontal ruler to the corresponding size position of the triangle plate body close to the side support structure, adjust the horizontal ruler to make it parallel to the center line of the plate body, and then place the front end face of the vertical plate base against the horizontal ruler so that the vertical plate is perpendicular to the horizontal ruler, that is, the center line of the vertical plate is perpendicular to the plate body. Hold the column of the marking disk with your right hand so that the base of the marking disk is against the vertical surface of the vertical plate. Rub the rightmost point of the arc surface of the two small end blanks of the triangle plate, adjust the horizontal ruler and release the locked marking needle on the marking disk, add the R1 dimension value to the left and lock it, hold the column of the marking disk with your right hand, and lean it against the vertical surface of the vertical plate. The marking disk intercepts the dimension values ​​of the center lines of the two small end mounting holes upward and downward respectively, marks the two small end center lines and uses them as the coordinate zero point. Release the locked marking needle on the marking disk, align to the right with the d / 2 dimension value of the horizontal ruler and lock it. Hold the column of the marking disc with your right hand, with the base against the vertical surface of the vertical board, and cut the d / 2 dimension value upward and downward respectively, marking the dimension limit of the lower part of the two small terminal mounting holes. Loosen the locked marking needle on the marking disc, align the dimension value of -d / 2 on the horizontal ruler to the right, and then lock it. Hold the column of the marking disc with your right hand, with the base against the vertical surface of the vertical board, and cut the -d / 2 dimension value upward and downward respectively, marking the dimension limit of the upper part of the two small terminal mounting holes.

[0019] Move the vertical plate to the left to the corresponding position of the horizontal ruler h coordinate dimension value, and the front end face of the vertical plate rests on the horizontal ruler in the state of the side support structure, so that the vertical surface of the vertical plate is perpendicular to the plate body of the triangle plate, that is, perpendicular to the center line of the plate body. Loosen the locked marking needle on the marking disk, align to the left with the horizontal ruler h coordinate dimension value and lock it. Hold the column of the marking disk with your left hand, with the base resting on the vertical surface of the vertical plate, and use the marking disk to intercept the center line h dimension value of the mounting hole on the surface of the large end. Mark out the center line of the large end mounting hole and use it as the reference line. Loosen the locked marking needle on the marking disk, align to the left with the horizontal ruler D / 2 dimension value and lock it. Hold the column of the marking disk with your left hand, resting on the vertical surface of the vertical plate, and intercept the D / 2 dimension value on the surface of the large end to mark the dimension limit of the upper part of the large end mounting hole. Loosen the locked marking needle on the marking disk, align it to the left with the -D / 2 coordinate dimension value of the horizontal ruler and lock it. Hold the column of the marking disk with your left hand, with the base against the vertical surface of the vertical plate. Use the marking disk to intercept the -D / 2 dimension value on the surface of the large end and mark the dimension boundary of the lower part of the large end mounting hole.

[0020] Check whether the size value of the large end R2 meets the design requirements.

[0021] The beneficial effects of the present invention are as follows:

[0022] By adjusting the three adjustable jacks, the dimension limit and center line of the set plate in the Z direction are determined. By adjusting the three adjustable jacks, the dimension limit and center line of the set plate in the X direction are determined. By coordinating the vertical plate and horizontal ruler, the dimension limit in the Y direction is determined.

[0023] The present invention creatively transforms the three-dimensional marking in three directions of the flipped set plate into the spatial dimension conversion of three dimensions in the three-dimensional space of mechanical engineering. The method transforms the three-dimensional marking in three directions of the flipped set plate into the marking process of plane marking in two directions with the assistance of a vertical plate, measuring and locking the size with a horizontal ruler. The marking process does not require clamping and fixing, while ensuring the marking accuracy.

[0024] The present invention can save one third of the marking time, eliminate the potential safety hazard caused by flipping the triangle plate in the third direction of three-dimensional marking, improve the marking efficiency, shorten the process cycle, and provide a reference template for the marking process of the same type of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the process flow chart of the Z direction of the present invention.

[0026] Figure 2 This is the process flow chart of the X direction of the present invention.

[0027] Figure 3 It is the process flow chart of the Y direction of the present invention.

[0028] Figure 4 It is a schematic diagram of the process flow in the Y direction of the present invention.

[0029] Figure 5 It is the front view of the horizontal ruler of the present invention.

[0030] Figure 6 It is a top view of a horizontal ruler of the present invention.

[0031] Figure 7 It is the right view of the horizontal ruler of the present invention.

[0032] Figure 8 It is a horizontal ruler sectional view of the present invention.

[0033] In the figure: 1-I-shaped base, 2-adjusting bolt, 3-slide plate, 4-steel ruler, 5-ear frame, 6-marking plate, 7-jack, 8-first shim, 9-second shim, 10-vertical plate, 11-large end, 12-small end, 20-horizontal ruler, 30-triangle plate, BTZX-center line of triangle plate 30, KJX-size limit of large end mounting hole, LJX-size limit of small end mounting hole, 40-marking platform, c-width size value of triangle plate, DSJX-machining size limit of upper surface of large end, DXJX-machining size limit of lower surface of large end, SXDZX-center line of end face of upper small end, SXSJX-machining size limit of upper surface of upper small end, SXXJX-machining size limit of lower surface of upper small end, X XDZX-center line of the end face of the lower small end, XXSJX-machining dimension limit of the upper surface of the lower small end, XXXJX-machining dimension limit of the lower surface of the lower small end, XDKZX-center line of the two small end mounting holes, XKXJX-dimension limit of the lower part of the two small end mounting holes, XKSJX-dimension limit of the upper part of the two small end mounting holes, h-hole distance between the large end mounting hole of the triangle plate and the two small end mounting holes, DDKZX-center line of the large end mounting hole, DDKSJX-dimension limit of the upper part of the large end mounting hole, DDKXJX-dimension limit of the lower part of the large end mounting hole, D-diameter of the large end mounting hole, d-diameter of the small end mounting hole, R1-radius of the arc surface of the outer surface of the small end blank, R2-radius of the arc surface of the outer surface of the large end blank. DETAILED DESCRIPTION

[0034] Preferred Embodiments

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0036] like Figure 1-8 As shown, a marking method for a triangle plate of an electric locomotive and an auxiliary device thereof include the following steps:

[0037] Step S1: Determination of the dimension value in the Z direction:

[0038] Support the triangle plate 30 horizontally on three adjustable jacks 7, adjust the jacks 7 to make the triangle plate 30 in a horizontal position, divide the triangle plate 30 into two halves, and use the marking plate 6 to mark the center line BTZX of the triangle plate 30 as the reference line in this direction. Mark the size limits KJX and LJX of the installation holes of the large end 11 and the small end 12.

[0039] Step S2: Determination of the X-direction dimension value:

[0040] The triangle plate 30 is supported sideways on three adjustable jacks 7. Since the large end 11 and the small end 12 welded on the triangle plate 30 have different height differences from the marking platform 40 as the reference plane, the support structure needs to be provided with a first shim 8 and a second shim 9 to increase the height. Figure 2 As shown. Place three adjustable jacks 7 on the first shim 8 and the second shim 9, adjust the adjustable jacks 7, use the square 18 and the marking disk 6 to align the center line BTZX of the triangle plate 30 and the X direction of the triangle plate 30, and then use the marking disk 6 to divide the X-direction dimension c of the triangle plate 30 in half, and use the c / 2 dimension value to mark the center line in this direction and use it as the coordinate zero point. Loosen the locked marking needle on the marking disk 6, move it to the height ruler 13, align it to the a / 2 dimension value and lock it, and mark the processing dimension limit DSJX of the upper end surface of the large end 11. Loosen the locked marking needle on the marking disk 6, move it to the height ruler 13, align it to the -a / 2 dimension value and lock it, and mark the processing dimension limit DXJX of the lower surface of the large end.

[0041] Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it upwards to the dimension value of s / 2 and lock it, and mark the center line SXDZX of the end face of the upper small end. Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it upwards to the dimension value of (s+b) / 2 and lock it, and mark the machining dimension limit SXSJX of the upper surface of the upper small end. Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it upwards to the dimension value of (sb) / 2 and lock it, and mark the machining dimension limit SXXJX of the lower surface of the upper small end.

[0042] Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it downwards to the dimension value of -s / 2 and lock it, and mark the center line of the end face of the lower small end XXDZX. Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it downwards to the dimension value of -(sb) / 2 and lock it, and mark the machining dimension limit XXSJX on the upper surface of the lower small end. Release the locked marking needle on the marking disk 6, move it to the height gauge 13, align it downwards to the dimension value of -(s+b) / 2 and lock it, and mark the machining dimension limit XXXJX on the lower surface of the lower small end.

[0043] Step S3: Determination of the Y-direction dimension value

[0044] When determining the marking process of the Y-direction dimension value, with the assistance of the horizontal ruler 20 and the vertical plate 10, the original need to flip the plate for three-dimensional marking is transformed into a spatial dimensional transformation of three dimensions, completing the marking operation in three supporting directions in two supporting directions.

[0045] Move the horizontal ruler 20 to the corresponding position of the triangle plate 30 in the state of the side support structure, adjust the horizontal ruler 20 to make it parallel to the center line BTZX of the triangle plate 30, and then lean the front end surface of the base of the vertical plate 10 against the horizontal ruler 20. Make the vertical plate 10 perpendicular to the horizontal ruler 20, that is, the vertical plate 10 is perpendicular to the center line BTZX of the triangle plate 30. Hold the column of the scribing disk 6 with your right hand, make the base of the scribing disk 6 lean against the vertical surface of the vertical plate 10, and rub the rightmost point of the arc surface of the two small ends 12 of the triangle plate 30, such as Figure 3 As shown. After adjusting the horizontal ruler 20, loosen the locked marking needle on the marking disk 6, add the R1 dimension value to the left and lock it, hold the column of the marking disk 6 with your right hand, lean against the vertical surface of the vertical plate 10, and the marking disk 6 marks the center line XDKZX of the two small terminal 12 installation holes upward and downward respectively and uses it as the coordinate zero point. Loosen the locked marking needle on the marking disk 6, align the d / 2 dimension value of the horizontal ruler 20 to the right and lock it, hold the column of the marking disk 6 with your right hand, lean the base against the vertical surface of the vertical plate 10, and the marking disk 6 intercepts the d / 2 dimension value on the surface of the two small terminals 12 upward and downward respectively, marking the dimension limit XKXJX of the lower part of the two small terminal installation holes. Release the locked marking needle on the marking disk 6, align the -d / 2 dimension value to the right, intercept the -d / 2 dimension value on the surface of the two small ends, and mark the dimension limit XKSJX on the upper part of the two small end mounting holes.

[0046] Move the vertical plate 10 to the left to the corresponding position of the horizontal ruler 20h coordinate dimension value, and the front end surface of the base of the vertical plate 10 leans against the horizontal ruler 20, so that the vertical plate 10 is perpendicular to the horizontal ruler 20, that is, the vertical plate 10 is perpendicular to the center line BTZX of the plate body. Loosen the locked marking needle on the marking disk 6, align the center line h coordinate dimension value of the large end 11 mounting hole of the horizontal ruler 20 to the left and lock it, hold the column of the marking disk 6 with your left hand, lean the base against the vertical surface of the vertical plate 10, use the marking disk 6 to intercept the center line h dimension value of the large end 11 mounting hole, mark the center line DDKZX of the large end 11 mounting hole and use it as the reference line. Loosen the locked marking needle on the marking disk 6, align it to the left with the D / 2 dimension value of the horizontal ruler 20 and then lock it, hold the column of the marking disk 6 with your left hand, with the base against the vertical surface of the vertical plate 10, cut the D / 2 dimension value on the surface of the large end 11 with the marking disk 6, and mark the dimension limit DDKSJX on the upper part of the large end installation hole. Loosen the locked marking needle on the marking disk 6, align it to the left with the D / 2 dimension value of the horizontal ruler 20 and then lock it, hold the column of the marking disk 6 with your left hand, with the base against the vertical surface of the vertical plate 10, cut the -D / 2 dimension value on the surface of the large end 11, and mark the dimension limit DDKXJX on the lower part of the large end 11 installation hole.

[0047] Check whether the size value of the large end 11R2 meets the design requirements.

[0048] The auxiliary device includes: a marking disk 6 for marking and aligning the position of a workpiece; a height gauge 13 for measuring the height dimension of the workpiece; a square ruler 18 for checking and aligning the vertical accuracy; a horizontal ruler 20 for checking and measuring the length dimension value; a first shim 8 and a second shim 9 for increasing the supporting height; a vertical plate 10 for marking and checking the vertical accuracy; and three adjustable jacks 7 for supporting and stabilizing the structure.

[0049] The horizontal ruler 20 includes an I-shaped base 1, an adjustment bolt 2, a slide plate 3, a steel plate ruler 4, and an ear frame 5. The base adopts an I-shaped structure. The I-shaped structure has strong bending resistance and high stability, and can ensure high measurement accuracy. The I-shaped base 1 can also achieve the purpose of weight reduction. Two through holes are set at both ends of the web of the I-shaped base 1 for use during hoisting. The top surface of the I-shaped base 1 is processed into a groove-like structure, and the slide plate 3 can slide with a gap on the upper surface of the groove. The steel plate ruler 4 or the ruler strip is fixed to the upper surface of the slide plate 3 by rivets. The lower surface of the slide plate 3 is provided with an ear frame 5, and the ear frame 5 is provided with a through hole and tapped with a thread. The end of the I-shaped base 1 close to the ear frame 5 is designed with a through hole, and the adjustment bolt 2 passes through the through hole with a gap and is threadedly connected with the threaded hole of the ear frame 5. When adjustment is required, the handle of the adjustment bolt 2 can be turned right or left, and the screw of the adjustment bolt 2 and the nut on the ear bracket 5 can be adjusted. The friction and pressure between the thread pairs can be used to convert the torque into thrust, thereby realizing the conversion between rotational motion and linear motion, thereby driving the steel ruler 4 or ruler bar to perform linear motion. The threaded transmission is self-locking, which can ensure the stability of the dimensional value in a static state.

Claims

1. A method for marking a triangle plate of an electric locomotive, characterized in that: The following steps are involved: S1: Draw the center line of the plate in the Z direction and the size limits of the large and small end mounting holes; S2: Draw the center line of the plate in the X direction and the size limits of the large and small end faces; S3: Use the auxiliary device horizontal ruler and vertical plate to mark the size boundaries of the large and small end mounting holes in the Y direction; S4: Check whether the size value of the large end R2 meets the design requirements.

2. The method for marking a triangle plate of an electric locomotive according to claim 1, characterized in that: In step S1: Determination of the dimension value in the Z direction: Support the triangle plate horizontally on three adjustable jacks, adjust the jacks to make the triangle plate in a horizontal position, divide the plate into two parts, use a marking disk to mark the center line of the triangle plate body and use it as the reference line in that direction; mark the size limits of the large and small end mounting holes.

3. The method for marking a triangle plate of an electric locomotive according to claim 2, characterized in that: In step S2: Determination of the dimension value in the X direction: Support the triangle plate sideways on three adjustable jacks, place the adjustable jacks on the pad iron, adjust the jacks, use the square and the marking disc to align the center line drawn in the Z direction and the X direction of the plate body, use the marking disc to divide the X direction dimension value c of the triangle plate body in half, mark the center line of this direction with the dimension value c / 2 and use it as the coordinate zero point, loosen the locked marking needle on the marking disc, move it to the height gauge, align it to the dimension value a / 2 and lock it, mark the processing dimension limit of the upper surface of the large end; loosen the locked marking needle on the marking disc, move it to the height gauge, align it to the dimension value -a / 2 and lock it, mark the processing dimension limit of the lower surface of the large end; Loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of s / 2 and then lock it, and mark the center line of the end face of the upper small end; loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of (s+b) / 2 and then lock it, and mark the machining dimension limit of the upper surface of the upper small end; loosen the locked marking needle on the marking disc, move it to the height gauge, align it upwards with the dimension value of (sb) / 2 and then lock it, and mark the machining dimension limit of the lower surface of the upper small end; Loosen the locked marking needle on the marking disk, move it to the front of the height gauge, align it downward to the -s / 2 dimension value and lock it, and mark the center line of the end face of the lower small end; loosen the locked marking needle on the marking disk, move it to the front of the height gauge, align it downward to the -(sb) / 2 dimension value and lock it, and mark the processing dimension limit on the upper surface of the lower small end; loosen the locked marking needle on the marking disk, move it to the front of the height gauge, align it downward to the -(s+b) / 2 dimension value and lock it, and mark the processing dimension limit on the lower surface of the lower small end.

4. The method for marking a triangle plate of an electric locomotive according to claim 3, characterized in that: In step S3: Determination of the Y-direction dimension value: When marking the Y-direction dimension value, the horizontal ruler and the vertical plate are used to assist, so that the original three-dimensional marking that requires flipping the triangle plate body can be transformed into a three-dimensional spatial transformation; the marking operation in three supporting directions can be completed in two supporting directions; Move the horizontal ruler to the corresponding size position of the triangle plate body in the state of the side support structure, adjust the horizontal ruler to make it parallel to the center line of the plate body, and then lean the front end face of the vertical plate base against the horizontal ruler, so that the vertical plate is perpendicular to the horizontal ruler, that is, the center line of the vertical plate and the plate body is perpendicular; hold the column of the scribing disk with your right hand, so that the base of the scribing disk leans against the vertical surface of the vertical plate; rub the rightmost point of the arc surface of the two small ends of the triangle plate blank, adjust the horizontal ruler and release the locked marking needle on the scribing disk, add the R1 size value to the left and lock it, hold the column of the scribing disk with your right hand, lean it against the vertical surface of the vertical plate, and the scribing disk cuts the two small ends upward and downward respectively The dimension value of the center line of the head mounting hole is used to mark the center lines of the two small ends and use them as the coordinate zero point; loosen the locked marking needle on the marking disk, align the dimension value of d / 2 of the horizontal ruler to the right and then lock it; hold the column of the marking disk with your right hand, with the base against the vertical surface of the vertical plate, and cut the dimension value of d / 2 upward and downward respectively to mark the dimension limit of the lower part of the two small end mounting holes; loosen the locked marking needle on the marking disk, align the dimension value of -d / 2 of the horizontal ruler to the right and then lock it, hold the column of the marking disk with your right hand, with the base against the vertical surface of the vertical plate, and cut the dimension value of -d / 2 upward and downward respectively to mark the dimension limit of the upper part of the two small end mounting holes; Move the vertical plate to the left to the corresponding position of the horizontal ruler h coordinate dimension value, and the front end face of the vertical plate rests on the horizontal ruler in the state of the side support structure, so that the vertical surface of the vertical plate is perpendicular to the plate body of the triangle plate, that is, perpendicular to the center line of the plate body; loosen the locked marking needle on the marking disk, align it to the left with the horizontal ruler h coordinate dimension value and then lock it, hold the column of the marking disk with your left hand, and the base rests on the vertical surface of the vertical plate, use the marking disk to intercept the center line h dimension value of the mounting hole on the surface of the large end, mark the center line of the large end mounting hole and use it as the reference line; loosen Open the locked marking needle on the marking disk, align it to the left with the D / 2 dimension value of the horizontal ruler and lock it, hold the column of the marking disk with your left hand, lean it against the vertical surface of the vertical board, intercept the D / 2 dimension value on the surface of the large end, and mark the dimension boundary of the upper part of the large end mounting hole; loosen the locked marking needle on the marking disk, align it to the left with the -D / 2 coordinate dimension value of the horizontal ruler and lock it, hold the column of the marking disk with your left hand, lean the base against the vertical surface of the vertical board, intercept the -D / 2 dimension value on the surface of the large end with the marking disk, and mark the dimension boundary of the lower part of the large end mounting hole.

5. The auxiliary device for the electric locomotive triangle plate marking method according to claim 4 is characterized in that: It includes a marking plate 6 for marking and aligning the position of a workpiece; a height gauge 13 for measuring the height dimension of the workpiece; a square ruler 18 for checking and aligning the vertical accuracy; a horizontal ruler 20 for checking and measuring the length dimension; a first shim 8 and a second shim 9 for increasing the support height; a vertical plate 10 for marking and checking the vertical accuracy; and three adjustable jacks 7 for supporting and stabilizing the structure. The horizontal ruler 20 includes an I-shaped base 1, an adjusting bolt 2, a slide plate 3, a steel ruler 4, and an ear frame 5. The base adopts an I-shaped structure, and two through holes are set at both ends of the web of the I-shaped base 1 for use in lifting; the top surface of the I-shaped base 1 is processed into a groove structure, and the slide plate 3 can slide with a gap on the upper surface of the groove, and the steel ruler 4 is fixed to the upper surface of the slide plate 3 by rivets; an ear frame 5 is set on the lower surface of the slide plate 3, and the ear frame 5 is provided with a through hole and tapped with a thread, and a through hole is designed at one end of the I-shaped base 1 close to the ear frame 5, and the adjusting bolt 2 passes through the through hole with a gap and is threadedly connected with the threaded hole of the ear frame 5.

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