A method and a measuring tool for symmetry measurement

Abstract

The present application relates to a method and a measuring tool for symmetry measurement, belonging to the technical field of symmetry measurement. The method includes cleaning the V-groove, cleaning the rectangular groove, cleaning the measuring surface, placing the positioning block, placing the fixing block, placing the measuring piece, and height difference measurement; the measuring tool includes a base body, a cross column slidably arranged on the base body, and one end of the cross column is hingedly provided with a first clamping plate and a second clamping plate above the V-groove at the bottom of the machine base. The first clamping plate is a pair and is used for clamping the positioning block, and the second clamping plate is located on both sides of the first clamping plate and is used for clamping the fixing block. A driving component for driving the first clamping plate and the second clamping plate to clamp is arranged on the cross column. The present application facilitates the measurement of V-grooves with different angles and height differences by using the positioning block, the fixing block, and the measuring piece, reduces the labor intensity, and has the advantage of being able to accurately measure the symmetry of mechanical components.

Description

Technical Field

[0001] This application relates to the technical field of symmetry measurement, and in particular, to a method and a measuring tool for symmetry measurement. Background Art

[0002] Currently, in the process of machining, due to the different structures of various mechanical parts, it is often encountered that the general measuring tools cannot be used for measurement. For example, Figure 1 As shown in the bottom of the motor base, the base is connected to the base, and a rectangular groove is formed on the base. Corresponding inclined surfaces are formed at the upper end of the rectangular groove, and the inclined surfaces form a V-shaped groove. A measuring surface is formed on the top surface of the V-shaped groove. That is, the relative offset of the upper end of the rectangular groove is the V-shaped groove, that is, the symmetry, and it is necessary to measure the symmetry of the two groove walls of the V-shaped groove.

[0003] The inventor found that it is difficult to measure the symmetry using the existing general measuring tools, so a measuring tool that can accurately measure the symmetry is needed. Summary of the Invention

[0004] In order to accurately measure the symmetry of mechanical components, the purpose of this application is to provide a method and a measuring tool for symmetry measurement.

[0005] On the one hand, a method for symmetry measurement provided by this application adopts the following technical solution:

[0006] A method for symmetry measurement includes the following steps:

[0007] Clean the V-shaped groove, rectangular groove, and measuring surface at the bottom of the base;

[0008] Place the positioning block in the measuring tool into the rectangular groove;

[0009] Place the two pairs of fixing blocks in the measuring tool into the V-shaped groove and abut against both sides of the positioning block, leaving a gap between the fixing blocks on the same side of the positioning block;

[0010] Place the measuring piece in the measuring tool between the positioning blocks, and make the measuring piece abut against the positioning block, fixing block, and V-shaped groove wall at the same time;

[0011] Measure the height difference of the measuring pieces on both sides of the positioning block, and calculate the center line offset of the V-shaped groove.

[0012] By adopting the above technical solution, the measurer wears clean gloves, wipes the bottom rectangular groove, the upper V-shaped groove and the measuring surface of part of the mechanical structure of the high-speed train motor base with alcohol, places the positioning block into the rectangular groove, and then places the fixing blocks on both sides of the positioning block, so that there are two fixing blocks on each side of the positioning block. The side wall of the fixing block is abutted against the positioning block, and the bottom wall is abutted against the V-shaped groove surface, and there is a gap greater than the measuring piece between the fixing blocks. Then, the measuring piece is placed into the gap between the fixing blocks, so that there are measuring pieces on both sides of the positioning block. The two fixing blocks on one side of the positioning block are pushed towards the measuring piece to clamp the measuring piece with the fixing blocks. Then, the height difference between the measuring pieces on both sides of the positioning block is measured with a general depth gauge, and the center line offset of the V-shaped groove is calculated through calculation. Therefore, by using the positioning block, the fixing block and the measuring piece, it is convenient to measure V-shaped grooves with different angles and height differences, reduces the labor intensity, and can accurately measure the symmetry of mechanical components.

[0013] Optionally, in the measurement of the height difference between the measuring pieces on both sides of the positioning block, the measuring piece on one side of the positioning block is the first steel ball, and the measuring piece on the other side is the second steel ball. The height difference includes the height that the first steel ball is higher than the second steel ball and the height that the second steel ball is higher than the first steel ball.

[0014] By adopting the above technical solution, the first steel ball and the second steel ball have wear resistance and corrosion resistance, improving the service life of the measuring piece. At the same time, using steel balls can respectively have point contact with the positioning block, the V-shaped groove surface and the fixing block to improve the measurement accuracy.

[0015] Optionally, the height difference that the first steel ball is higher than the second steel ball calculates the positive offset of the center line of the V-shaped groove, and the height difference that the second steel ball is higher than the first steel ball calculates the negative offset of the center line of the V-shaped groove.

[0016] By adopting the above technical solution, when measuring the offset of the center line of the V-shaped groove, the height of the first steel ball is higher than the height of the second steel ball. That is, the height difference is obtained by subtracting the height of the second steel ball from the height of the first steel ball, and then the positive offset of the V-shaped groove is calculated through the height difference. On the contrary, the height difference that the second steel ball is higher than the first steel ball can calculate the negative offset of the V-shaped groove. The positive and negative offsets respectively correspond to both sides in the length direction of the positioning block, so as to facilitate obtaining the offset of the center line of the V-shaped groove.

[0017] On the other hand, the present application provides a measuring tool for symmetry measurement. In the method for symmetry measurement, it includes a positioning block, a fixing block, a measuring piece, and also includes a seat body and a cross column slidably arranged on the seat body. One end of the cross column is hinged with a first clamping plate and a second clamping plate located above the V-shaped groove at the bottom of the machine base. The first clamping plate is a pair and is used to clamp the positioning block. The second clamping plate is located on both sides of the first clamping plate and is used to clamp the fixing block. A driving component for driving the first clamping plate and the second clamping plate to clamp is arranged on the cross column.

[0018] By adopting the above technical solution, when measuring the offset of the center line of the V-shaped groove, slide the transverse column to drive the first clamping plate and the second clamping plate to slide in the vertical direction until the first clamping plate covers the positioning block and the second clamping plate covers the fixed block. Then the driving assembly is started to drive the first clamping plate to clamp the positioning block and the second clamping plate to clamp the fixed block, and slide the transverse column upward to drive the clamped positioning block and fixed block upward. Then rotate the seat body to rotate the positioning block and the fixed block above the V-shaped groove at the bottom of the machine base, and the transverse column drives the first clamping plate and the second clamping plate to slide downward. The driving assembly drives the first clamping plate and the second clamping plate to open, so as to place the positioning block into the rectangular groove and the fixed block into the V-shaped groove, so that the fixed block and the positioning block are in contact with each other and also in contact with the groove wall of the V-shaped groove, and at this time, a gap for placing the first steel ball and the second steel ball is formed between the fixed blocks. After the first steel ball and the second steel ball are placed, the first steel ball and the second steel ball are in contact with the positioning block, the fixed block and the groove wall of the V-shaped groove at the same time, and push the fixed block to clamp the measuring piece to limit the measuring piece, so as to measure the height of the measuring piece and improve the accuracy of measuring the height of the measuring piece.

[0019] Optionally, abutting portions are formed at the upper ends of the first clamping plate and the second clamping plate. The abutting portion on the first clamping plate bends in a direction away from each other, and the abutting portion on the second clamping plate also bends in a direction away from each other. The first clamping plate is hinged inside the transverse column, and the second clamping plate is hinged on the side wall of the transverse column. The first clamping plate and the second clamping plate are both hinged inside the transverse column. Branches corresponding to the fixed blocks on both sides of the positioning block are formed at the lower end of the second clamping plate. The abutting portions drive the lower ends of the first clamping plate and the second clamping plate to approach each other after being driven by the driving assembly.

[0020] By adopting the above technical solution, when clamping the positioning block and the fixed block, the driving assembly drives the abutting portions to move away from each other, and drives the lower ends of the first clamping plate to rotate towards each other and the lower ends of the second clamping plate to rotate towards each other. So that the two branches of the second clamping plate respectively push the fixed block to clamp the fixed block, so that the driving assembly can drive the first clamping plate to rotate while driving the second clamping plate to rotate, realizing the synchronous action of the first clamping plate and the second clamping plate driven by a single driving source.

[0021] Optionally, the driving assembly includes a driving column slidably disposed inside the transverse column and a cylinder disposed on the transverse column to drive the driving column to slide between the abutting portions of the first clamping plate and between the abutting portions of the second clamping plate. The driving column is used to push the abutting portion to drive the clamping portion to clamp.

[0022] By adopting the above technical solution, when the driving clamp plate 1 and clamp plate 2 rotate, the cylinder drives the driving column to slide down, and the driving column abuts on the abutting part, so that the abutting parts rotate in the direction of moving away from each other, so that the upper ends of clamp plate 1 and clamp plate 2 move away from each other. Then, the lower ends of clamp plate 1 and clamp plate 2 move closer to each other, so that clamp plate 1 clamps the positioning block and clamp plate 2 clamps the fixing block.

[0023] Optionally, the lower end of the branch formed by the second clamping plate is connected to an abutment plate that abuts against the side wall of the fixed block, and positioning plates for abutting the fixed block are arranged side by side in the horizontal column, and the abutment plate is used to abut the fixed block onto the positioning plate.

[0024] By adopting the above technical solution, when the second clamping plate clamps the fixed block, the driving column abuts the abutting part of the second clamping plate, driving the lower ends of the second clamping plate to move closer to each other, so that after the abutting plate of the second clamping plate abuts against the fixed block, the fixed block is pressed against the positioning plate. After the second clamping plate is opened, the two pairs of fixed blocks can be clamped respectively, so that it is convenient to clamp all the fixed blocks at one time and then transfer them.

[0025] Optionally, a slideway is provided in the horizontal column and located between the second clamping plate, the lower end of the slideway is located above the positioning plate, the upper end of the slideway passes through the side wall of the horizontal column, and the first clamping plate is provided with an avoidance groove for avoiding the slideway, the slideway allows steel balls one and two to slide down and slide off from between the positioning plates, the upper end of the side wall of the fixed block abuts against the positioning plate, and the lower end of the side wall of the fixed block does not abut against the positioning plate.

[0026] By adopting the above technical scheme, when steel ball 1 and steel ball 2 are placed between the fixed blocks, steel ball 1 and steel ball 2 slide down after being placed in the slideway, and slide out from between the positioning plates, so that steel ball 1 and steel ball 2 can slide between the fixed blocks. At this time, the fixed block has been placed on the wall of the V-shaped groove, and the cylinder drives the driving column to slide up, driving the clamping plate 1 to rotate while driving the clamping plate 2 to rotate, and the avoidance groove allows the clamping plate 1 to rotate smoothly. Then drive the lower end of the clamping plate 2 to release the abutment against the fixed block, and the cross column drives the clamping plate 2 to slide up. Until the fixed block is separated from the positioning plate, the abutment plate at this time is still located on one side of the fixed block, and the cylinder drives the driving column to slide down again, abutting the abutment part, driving the abutment plates to move closer to each other, so that the abutment plates abut the fixed block to move closer to each other, so that the fixed block that is close to each other clamps steel ball 1 and steel ball 2, and limits steel ball 1 and steel ball 2 on the V-shaped groove surface, so that it is convenient for steel ball 1 and steel ball 2 to be placed in the fixed block to realize automatic clamping.

[0027] Optionally, a slide plate is slidably connected to the inner wall of the horizontal column, and a through hole is opened at the lower end of the slide for the end of the slide plate to slide into, and one end of the slide plate sliding into the through hole is used to prevent steel ball one or steel ball two from sliding down.

[0028] By adopting the above technical solution, when the second clamping plate clamps the fixing block and slides down along the transverse column, the sliding plate slides into the through hole to block the first steel ball and the second steel ball, preventing the first steel ball and the second steel ball from sliding out of the lower end of the slideway when the transverse column slides down. Until the fixing block is placed in the V-shaped groove and abuts against the positioning block, then the sliding plate is slid out of the through hole, and the first steel ball and the second steel ball fall between the fixing blocks, so that it is convenient for the fixing block to be first placed in the V-shaped groove and then the first steel ball and the second steel ball fall into the V-shaped groove.

[0029] Optionally, a spring is arranged between the second clamping plates. One end of the spring is connected to one of the second clamping plates, and the other end of the spring is connected to the other second clamping plate. The spring is used to pull the upper ends of the second clamping plates to approach each other and the lower ends to move away from each other. The sliding plate slides on one side of the second clamping plates. An embedding groove for the second clamping plates to be embedded is formed at one end of the sliding plate away from the slideway, and the width of the embedding groove is greater than the thickness of the second clamping plates.

[0030] By adopting the above technical solution, when the second clamping plates clamp the fixing block and place it in the V-shaped groove, the driving column slides upward to disengage from the abutting part. The upper ends of the second clamping plates are subjected to the pulling force of the spring, driving the upper ends of the second clamping plates to approach each other and the lower ends to move away from each other, so that the abutting plate disengages from the fixing block and the fixing block is placed in the V-shaped groove. While the lower ends of the second clamping plates move away from each other, the second clamping plates rotate in the embedding groove and then drive the sliding plate to slide in a direction away from the slideway, so that the slideway automatically slides away from the through hole and the lower end of the slideway is opened, facilitating the first steel ball and the second steel ball to automatically slide out of the lower end of the slideway. Therefore, by arranging the spring, after the spring drives the second clamping plates to rotate, the sliding plate is indirectly driven to slide, realizing the automatic sliding of the sliding plate, thus facilitating the slideway to be automatically opened by the sliding plate after the fixing block is put down.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. By using the positioning block, the fixing block and the measuring piece, it is convenient to measure V-shaped grooves with different angles and height differences, reducing the labor intensity and being able to accurately measure the symmetry of mechanical components;

[0033] 2. By arranging the first clamping plate and the second clamping plate, it is convenient to automatically place the positioning block and the fixing block on the mechanical structure at the bottom of the machine base;

[0034] 3. By arranging the driving column, the abutting part, the abutting plate and the positioning plate, the driving column is used to push the abutting part away, so that the abutting plates approach each other to clamp and hold the fixing block tightly on the positioning plate, facilitating the clamping of the fixing block;

[0035] 4. By arranging the slideway, with the upper end of the side wall of the fixing block abutting against the positioning plate, when the transverse column moves upward to drive the fixing block to disengage from the positioning plate, the driving column moves downward to drive the abutting plate to push the fixing block to automatically clamp the falling first steel ball and the second steel ball;

[0036] 5. By setting a spring, after the spring drives the second clamping plate to rotate, it indirectly drives the sliding plate to slide, realizing the automatic sliding of the sliding plate, so as to facilitate the sliding plate to automatically open the slideway after the fixed block is put down. Description of the Drawings

[0037] Figure 1 It is a schematic diagram of the bottom structure of the motor base.

[0038] Figure 2 It is a top view for showing the placement of the measuring piece in the embodiment of the present application.

[0039] Figure 3 It is a schematic diagram of the overall structure for showing the measuring tool in the embodiment of the present application.

[0040] Figure 4 It is a schematic diagram of the internal structure for showing the cross column in the embodiment of the present application.

[0041] Figure 5 It is a schematic diagram of the structure for showing the positioning plate in the embodiment of the present application.

[0042] Figure 6 It is a flowchart of the measuring method in the embodiment of the present application.

[0043] Figure 7 It is a schematic diagram of the first steel ball and the second steel ball in the theoretical state in the embodiment of the present application.

[0044] Figure 8 It is a schematic diagram for showing the measurement of right offset in the embodiment of the present application.

[0045] Figure 9 It is a schematic diagram for showing the measurement of left offset in the embodiment of the present application.

[0046] Description of the reference numerals: 1, base; 11, rectangular groove; 12, V-shaped groove; 13, measuring surface; 2, positioning block; 3, fixed block; 4, measuring piece; 41, first steel ball; 42, second steel ball; 5, seat body; 51, lead screw; 52, motor; 53, cylinder; 54, driving column; 6, cross column; 61, first clamping plate; 611, avoidance groove; 62, second clamping plate; 621, spring; 63, abutting portion; 64, abutting plate; 65, positioning plate; 7, fixing plate; 71, slideway; 711, through hole; 72, sliding plate; 721, embedding groove; 73, through groove; 74, limiting block; 75, avoidance groove. Detailed Description of the Embodiment

[0047] The following further describes the present application in detail Figures 1-9 with reference to the attached

[0048] Refer to Figure 1, the bottom of a partial mechanical structure of a high-speed train motor housing includes a base 1. A rectangular groove 11 is formed in the base 1 and extends along the length direction of the housing. Corresponding inclined surfaces are formed at the upper end of the rectangular groove 11, and the inclined surfaces form a V-shaped groove 12. The top surface of the V-shaped groove forms a measuring surface.

[0049] The embodiment of the present application discloses a measuring tool for symmetry measurement.

[0050] Referring to Figure 1 and Figure 2 , the measuring tool includes a positioning block 2, a fixing block 3, and a measuring member 4. The positioning block 2 is located in the rectangular groove 11. There are four fixing blocks 3, two in a pair, and one pair on each side of the positioning block 2. The bottom of the fixing block 3 is inclined, that is, the fixing block 3 abuts against the groove wall of the V-shaped groove 12, and at the same time, the fixing block 3 also abuts against the side wall of the positioning block 2. The measuring member 4 includes a first steel ball 41 and a second steel ball 42. The first steel ball 41 and the second steel ball 42 are respectively located on both sides of the positioning block 2. The first steel ball 41 and the second steel ball 42 are simultaneously in contact with the positioning block 2, the fixing block 3, and the groove wall of the V-shaped groove 12, and the fixing block 3 separately clamps the first steel ball 41 and the second steel ball 42.

[0051] Referring to Figure 3 , the measuring tool further includes a seat body 5 and a cross column 6 slidably connected to the seat body 5 in the vertical direction. A lead screw 51 is rotatably connected in the seat body 5, and a motor 52 for driving the rotation of the lead screw 51 is fixed at the top of the seat body 5. The lead screw 51 passes through and is threadedly connected to the cross column 6 to drive the cross column 6 to slide along the axial direction of the lead screw 51.

[0052] Referring to Figure 3 and Figure 4 , one end of the cross column 6 away from the seat body 5 has a cavity. A pair of first clamping plates 61 and a pair of second clamping plates 62 are hingedly arranged in the cross column 6. The pair of first clamping plates 61 are located between the second clamping plates 62. The hinge axes of the first clamping plates 61 and the second clamping plates 62 both extend in the horizontal direction.

[0053] Referring to Figure 4 , the upper ends of the first clamping plates 61 are bent and inclined in a direction away from each other, and the upper ends of the second clamping plates 62 are also bent and inclined in a direction away from each other, that is, the upper ends of the first clamping plates 61 and the second clamping plates 62 both form abutting portions 63, and the abutting portions 63 have elasticity.

[0054] Referring to Figure 3 and Figure 4 , a driving assembly for driving the first clamping plates 61 and the second clamping plates 62 to rotate simultaneously is installed on the cross column 6, and it drives the upper ends of the first clamping plates 61 to move away from each other and the lower ends to move closer to each other, and the upper ends of the second clamping plates 62 to move away from each other and the lower ends to move closer to each other.

[0055] Referring to Figure 3 and Figure 4, a cylinder 53 of the driving component package fixed to the cross column 6 and a driving column 54 connected to the piston rod of the cylinder 53. The piston rod of the cylinder 53 slides through the top wall of the cross column 6 and then is connected to the driving column 54. The driving column 54 slides between the first clamping plate 61 and the second clamping plate 62, and the driving column 54 slides and abuts against the abutting portion 63 to drive the lower ends of the first clamping plate 61 and the second clamping plate 62 to rotate away from each other.

[0056] Refer to Figure 3 and Figure 4 , an opening is formed on the bottom wall of the cross column 6, and the lower ends of the first clamping plate 61 and the second clamping plate 62 extend out from the opening. The lower ends of the first clamping plate 61 and the second clamping plate 62 extending out of the opening are located above the V-shaped groove 12 at the bottom of the machine base, and the first clamping plate 61 is located on both sides of the positioning block 2 for clamping the positioning block 2.

[0057] Refer to Figure 3 and Figure 4 , fixed plates 7 are fixedly connected to two opposite side walls inside the cross column 6. The first clamping plate 61 is hinged to the fixed plate 7, and the fixed plate 7 is located on both sides of the first clamping plate 61 and the second clamping plate 62 at the same time, so that the first clamping plate 61 can rotate smoothly to clamp the positioning block 2, and the second clamping plate 62 can rotate smoothly to clamp the fixed block 3.

[0058] Refer to Figure 4 and Figure 5 , branches corresponding to the fixed blocks 3 on both sides of the positioning block 2 are formed at the lower end of the second clamping plate 62, and an abutting plate 64 is connected to the ends of the second clamping plate 62 forming the two branches. The abutting plate 64 is used to abut against the side wall of the fixed block 3. Positioning plates 65 are fixedly connected side by side on the fixed plate 7, so that the two fixed blocks 3 on the same side of the positioning block 2 abut against the positioning plates 65. After the lower ends of the second clamping plate 62 approach each other, the abutting plate 64 is driven to rotate, so that the abutting plate 64 presses the fixed block 3 tightly against the positioning plate 65 to clamp the fixed blocks 3 on both sides of the positioning block 2.

[0059] Refer to Figure 4 , a spring 621 is fixedly connected to the connection between the upper end of the second clamping plate 62 and the abutting portion 63. The other end of the spring 621 is connected to the second clamping plate 62 on one side, so as to drive the upper ends of the second clamping plate 62 to approach each other through the pulling force of the spring 621, so that the abutting plates 64 at the lower ends of the second clamping plate 62 are away from each other and the fixed block 3 is put down.

[0060] Refer to Figure 4 and Figure 5, the abutting plate 64 abuts and fixes the entire side wall of the fixed block 3 facing away from the positioning plate 65. The upper end of the side wall of the fixed block 3 facing away from the abutting plate 64 abuts against the positioning plate 65, and the lower end of the side wall of the fixed block 3 facing the positioning plate 65 does not abut against the positioning plate 65. So that after the abutting plate 64 releases the abutment on the fixed block 3, the fixed block 3 falls onto the wall of the V-shaped groove 12. Then the cross column 6 drives the second clamping plate 62 and the abutting plate 64 to move upward, so that the fixed block 3 is located below the positioning plate 65. At this time, the abutting plate 64 is still on one side of the fixed block 3. Then the second clamping plate 62 drives the abutting plate 64 to approach again, so that after the fixed block 3 is pushed away from the positioning plate 65, it can approach again.

[0061] Refer to Figure 3 and Figure 4 , a slideway 71 penetrates through the fixing plate 7. An avoidance groove 75 is formed on the fixing plate 7 to avoid the slideway 71 and allow the slideway 71 to pass through. The lower end of the slideway 71 bends and extends above the positioning plate 65. The upper end of the slideway 71 penetrates through the side wall of the cross column 6.

[0062] Refer to Figure 3 and Figure 5 , an avoidance groove 611 for avoiding the slideway 71 is formed on the first clamping plate 61, so that the first clamping plate 61 can rotate normally. Furthermore, it is convenient for the first steel ball 41 and the second steel ball 42 to slide into the slideways 71 on both sides of the cross column 6 respectively. And the distance between the lower end diameter of the slideway 71 and the positioning plate 65 is the same, so that the first steel ball 41 and the second steel ball 42 can slide down from between the positioning plates 65 through the lower end of the slideway 71, and it is convenient for the first steel ball 41 and the second steel ball 42 to fall between the fixed blocks 3.

[0063] Refer to Figure 4 , one end of the fixing plate 7 is slidably connected with a sliding plate 72, that is, the sliding plate 72 is located on both sides of the positioning block 2 and close to the same end of the positioning block 2. A through groove 73 for the sliding plate 72 to slide horizontally is formed on the fixing plate 7, and the through groove 73 penetrates through the side wall of one side of the fixing plate 7. One end of the sliding plate 72 passing through the fixing plate 7 and away from the first clamping plate 61 is fixedly connected with a limiting block 74, and the limiting block 74 slidably abuts against the side wall of the fixing plate 7 facing away from the first clamping plate 61, so as to limit the sliding plate 72 from detaching from the fixing plate 7 and facilitate the sliding of the sliding plate 72 in the horizontal direction.

[0064] Refer to Figure 4 and Figure 5, the skateboard 72 slides on one side of the fixed plate 7 facing the second clamping plate 62. A slot 721 for the second clamping plate 62 to be inserted into is formed on the skateboard 72. The width of the slot 721 is greater than the thickness of the second clamping plate 62, so that the second clamping plate 62 can drive the skateboard 72 to slide after rotation. The lower end of the slideway 71 is located on the sliding path of the skateboard 72, that is, a through hole 711 for the end of the skateboard 72 to slide into is formed on the slideway 71. Only a part of the end of the skateboard 72 slides into the through hole 711, that is, after the skateboard 72 slides into the through hole 711, it restricts the first steel ball 41 and the second steel ball 42 from sliding out of the slideway 71. After the lower ends of the second clamping plates 62 move away from each other, they drive the skateboard 72 to slide in a direction away from the slideway 71, so that the skateboard 72 slides out of the through hole 711 to open the slideway 71 and release the first steel ball 41 and the second steel ball 42 from the slideway 71.

[0065] The implementation principle of the measuring tool for symmetry measurement in the embodiment of the present application is as follows: When measuring the offset of the center line of the V-shaped groove 12, rotate the seat body 5 to position the first clamping plate 61 and the second clamping plate 62 above the fixed block 3 and the positioning block 2. The air cylinder 53 drives the driving column 54 to slide downwards, the first clamping plate 61 clamps the fixed block 3, and the second clamping plate 62 presses the positioning block 2 against the positioning plate 65 to complete the clamping of the positioning block 2 and the fixed block 3. Then rotate the seat body 5 to position the clamped fixed block 3 and positioning block 2 above the V-shaped groove 12 at the bottom of the machine base. Then the air cylinder 53 drives the driving column 54 to slide upwards. After disengaging from the abutting portion 63, the lower end of the first clamping plate 61 loosens to place the positioning block 2 into the rectangular groove 11, and the lower end of the second clamping plate 62 loosens to place the fixed block 3 onto the V-shaped groove 12. When the second clamping plate 62 places the fixed block 3 down, it drives the skateboard 72 to slide out of the through hole 711. After the first steel ball 41 and the second steel ball 42 fall out of the slideway 71, they pass between the positioning plates 65 and finally fall between the fixed blocks 3. The cross column 6 drives the first clamping plate 61 and the second clamping plate 62 to move upwards, so that the first clamping plate 61 disengages from the positioning block 2, and the abutting plate 64 of the second clamping plate 62 still remains on one side of the fixed block 3. At this time, the air cylinder 53 drives the driving column 54 to slide downwards again, pushing the second clamping plate 62 to rotate, so that the abutting plates 64 approach and push the fixed blocks 3 to approach, so that the fixed blocks 3 clamp the first steel ball 41 and the second steel ball 42, and the first steel ball 41 and the second steel ball 42 are simultaneously abutted against the positioning block 2, the fixed block 3, and the wall of the V-shaped groove 12, so as to measure the height difference by measuring the heights of the first steel ball 41 and the second steel ball 42, thereby improving the accuracy of measuring the heights of the first steel ball 41 and the second steel ball 42.

[0066] The embodiment of the present application also discloses a method for symmetry measurement, including the following steps:

[0067] Refer to Figure 5 and Figure 6, clean the V-shaped groove 12, rectangular groove 11, and measuring surface 13 at the bottom of the machine base; the measurer wears clean gloves and wipes the rectangular groove 11, upper V-shaped groove 12, and measuring surface 13 at the bottom of the mechanical structure of the high-speed train motor base with alcohol to reduce the influence of dust and debris on the measurement accuracy.

[0068] Place the positioning block 2 into the rectangular groove 11; the cross-column 6 slides down, and the first clamping plate 61 is in an open state. Until the first clamping plate 61 covers the positioning block 2, the air cylinder 53 drives the driving column 54 to slide down, and the driving column 54 presses against the first clamping plate 61 to rotate and clamp the positioning block 2.

[0069] Place two pairs of fixing blocks 3 into the V-shaped groove 12 and abut against both sides of the positioning block 2; there is a gap between the fixing blocks 3 on the same side of the positioning block 2; the cross-column 6 slides down, and the second clamping plate 62 is in an open state. Until the second clamping plate 62 covers the positioning block 2, the air cylinder 53 drives the driving column 54 to slide down, and at the same time presses against the first clamping plate 61 and the second clamping plate 62 to rotate, that is, while the first clamping plate 61 clamps the positioning block 2, the second clamping plate 62 clamps the fixing blocks 3.

[0070] Place the measuring piece 4 in the measuring tool between the positioning blocks 2, and make the measuring piece 4 abut against the positioning blocks 2, fixing blocks 3, and the wall of the V-shaped groove 12 at the same time; the measuring piece 4 is the first steel ball 41 and the second steel ball 42. Place the first steel ball 41 and the second steel ball 42 into the slideway 71. As the second clamping plate 62 releases the fixing blocks 3, it drives the slide plate 72 to slide out of the slideway 71, and the first steel ball 41 and the second steel ball 42 automatically fall out of the slideway 71, so that the first steel ball 41 and the second steel ball 42 fall between the fixing blocks 3.

[0071] Measure the height difference of the measuring pieces 4 on both sides of the positioning block 2, and calculate the center line offset of the V-shaped groove 12. The height difference includes the height that the first steel ball 41 is higher than the second steel ball 42 and the height that the second steel ball 42 is higher than the first steel ball 41. That is, the height difference that the first steel ball 41 is higher than the second steel ball 42 is used to calculate the positive offset of the center line of the V-shaped groove 12, that is, the left offset; the height difference that the second steel ball 42 is higher than the first steel ball 41 is used to calculate the reverse offset of the center line of the V-shaped groove 12, that is, the right offset.

[0072] Refer to Figure 7 , in the theoretical state, the heights of the first steel ball 41 and the second steel ball 42 are the same. Respectively draw vertical lines O1, C1; O2, C2 and O1, T1; O2, T2; d1, d2, L1, L2; angles α / 2, α / 4, and radius R through the centers O1, O2. When the left and right included angles α / 2 are equal, draw two identical diameter circles and tangent to the inclined plane respectively. Since d1 = R * cot(α / 4), d2 = R * cot(α / 4), and d1 = d2, so L1 = L2, and at this time the left and right offsets are 0;

[0073] Refer toFigure 8 When the center line of the V-groove 12 shifts to the right, perpendicular lines O1, C1; O2, C2; O1, T1; O2, T2; O1, P1, O2, P2; O1, G1; O2, G2 are drawn through the centers O1 and O2 respectively.

[0074] d3, d4, d5, d6, d7, d8, d9, d10, L3, L4. Angle α / 2, offset S1, radius R.

[0075] Since d10 = R - S1, d3 = cot(α / 2) * d10 = cot(α / 2) * (R - S1), d4 = R ÷ sin(α / 2), d5 = d3 + d4 = [cot(α / 2) * (R - S1)] + [R ÷ sin(α / 2)];

[0076] L3 = d5 + R = [cot(α / 2) * (R - S1)] + [R ÷ sin(α / 2)] + R;

[0077] Since d9 = S1 + R, d6 = cot(α / 2) * d9 = cot(α / 2) * (S1 + R), d7 = R ÷ sin(α / 2), d8 = d6 + d7 = [cot(α / 2) * (S1 + R)] + [R ÷ sin(α / 2)];

[0078] L4 = d8 + R = [cot(α / 2) * (S1 + R)] + [R ÷ sin(α / 2)] + R.

[0079] By comprehensive calculation, L4 - L3 = [cot(α / 2) * (S1 + R)] + [R ÷ sin(α / 2)] + R - {[cot(α / 2) * (R - S1)] + [R ÷ sin(α / 2)] + R};

[0080] Therefore, L4 - L3 = 2 * S1 * cot(α / 2), that is, S1 = [(L4 - L3) ÷ 2] * tan(α / 2), where L4 - L3 is the height difference of the first steel ball 41 above the second steel ball 42.

[0081] That is, S1 = [(L4 - L3) ÷ 2] * tan(α / 2) is the rightward offset of the center line of the V-groove 12, thus forming a general formula. Just input the formula to calculate the rightward offset of the center line of the V-groove 12.

[0082] Refer to Figure 9 When the center line of the V-groove 12 shifts to the left, perpendicular lines O1, C1; O2, C2; O1, T1; O2, T2; O1, P1, O2, P2; O1, G1; O2, G2 are drawn through the centers O1 and O2 respectively.

[0083] d3, d4, d5, d6, d7, d8, d9, d10, L5, L6. Angle α / 2, offset S2, radius R.

[0084] Since d10 = R + S2, d3 = cot(α / 2) * d10 = cot(α / 2) * (R + S2), d4 = R ÷ sin(α / 2), d5 = d3 + d4 = [cot(α / 2) * (R + S2)] + [R ÷ sin(α / 2)];

[0085] L5 = d5 + R = [cot(α / 2) * (R + S2)] + [R ÷ sin(α / 2)] + R;

[0086] Since d9 = R - S2, d6 = cot(α / 2) * d9 = cot(α / 2) * (R - S2), d7 = R ÷ sin(α / 2), d8 = d6 + d7 = [cot(α / 2) * (R - S2)] + [R ÷ sin(α / 2)];

[0087] L6 = d8 + R = [cot(α / 2) * (R - S2)] + [R ÷ sin(α / 2)] + R.

[0088] By comprehensive calculation, L5 - L6 = [cot(α / 2) * (R + S2)] + [R ÷ sin(α / 2)] + R - {[cot(α / 2) * (R - S2) + [R ÷ sin(α / 2)] + R};

[0089] Therefore, L5 - L6 = 2 * S2 * cot(α / 2), that is, S2 = [(L5 - L6) ÷ 2] * tan(α / 2), where L5 - L6 is the height difference between ball two 42 and ball one 41.

[0090] That is, S2 = [(L5 - L6) ÷ 2] * tan(α / 2) is the left offset of the center line of the V-groove 12. Thus, a general formula is formed. Just input the formula to calculate the left offset of the center line of the V-groove 12.

[0091] The implementation principle of the method for measuring symmetry in the embodiment of this application is as follows: Use the positioning block 2 and the fixing block 3 to fix the positions of ball one 41 and ball two 42 in the V-groove 12. By measuring the height difference between ball one 41 and ball two 42 on the inclined groove walls of the V-groove 12, the offset of the center line of the V-groove 12 can be calculated by substituting the height differences of the V-groove 12 walls at different angles into the formula, reducing the labor intensity and achieving fast and effective measurement.

[0092] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A method for symmetry measurement, characterized in that: The measuring tool includes a positioning block (2), a fixing block (3), and a measuring member (4). The positioning block (2) is located in a rectangular groove (11). There are four fixing blocks (3), two in a pair, and one pair on each side of the positioning block (2). The bottom of the fixing block (3) is inclined, that is, the fixing block (3) abuts against the groove wall of the V-shaped groove (12), and at the same time, the fixing block (3) also abuts against the side wall of the positioning block (2). The measuring member (4) includes a first steel ball (41) and a second steel ball (42). The first steel ball (41) and the second steel ball (42) are respectively located on both sides of the positioning block (2). The first steel ball (41) and the second steel ball (42) simultaneously abut against the positioning block (2), the fixing block (3), and the groove wall of the V-shaped groove (12), and the fixing block (3) separately clamps the first steel ball (41) and the second steel ball (42) respectively; It includes the following steps: Clean the V-shaped groove (12), rectangular groove (11), and measuring surface (13) at the bottom of the machine base; Put the positioning block (2) in the measuring tool into the rectangular groove (11); Put the two pairs of fixing blocks (3) in the measuring tool into the V-shaped groove (12) and abut against both sides of the positioning block (2), leaving a gap between the fixing blocks (3) on the same side of the positioning block (2); Put the first steel ball (41) and the second steel ball (42) of the measuring member (4) in the measuring tool between the positioning blocks (2), and make the first steel ball (41) and the second steel ball (42) simultaneously abut against the positioning block (2), the fixing block (3), and the wall of the V-shaped groove (12); Measure the height difference between the first steel ball (41) and the second steel ball (42) on both sides of the positioning block (2), and calculate the center line offset of the V-shaped groove (12); Among the height differences between the first steel ball (41) and the second steel ball (42) on both sides of the positioning block (2) measured, the height difference includes the height that the first steel ball (41) is higher than the second steel ball (42) and the height that the second steel ball (42) is higher than the first steel ball (41); The height difference that the first steel ball (41) is higher than the second steel ball (42) calculates the positive offset of the center line of the V-shaped groove (12), and the height difference that the second steel ball (42) is higher than the first steel ball (41) calculates the reverse offset of the center line of the V-shaped groove (12).

2. A measuring tool for symmetry measurement, which is used in the method for symmetry measurement described in the above-mentioned claim 1, and includes a positioning block (2), a fixing block (3), and a measuring member (4), and is characterized in that: It further includes a seat body (5) and a cross column (6) slidably arranged on the seat body (5). One end of the cross column (6) is hinged with a first clamping plate (61) and a second clamping plate (62) located above the V-shaped groove (12) at the bottom of the machine base. The first clamping plate (61) is in a pair and is used to clamp the positioning block (2), and the second clamping plate (62) is located on both sides of the first clamping plate (61) and is used to clamp the fixing block (3). A driving component for driving the first clamping plate (61) and the second clamping plate (62) to clamp is provided on the cross column (6).

3. A measuring tool for symmetry measurement according to claim 2, characterized in that: The upper ends of the first clamping plate (61) and the second clamping plate (62) are both formed with abutting portions (63). The abutting portion (63) on the first clamping plate (61) bends in a direction away from each other, and the abutting portion (63) on the second clamping plate (62) also bends in a direction away from each other. The first clamping plate (61) and the second clamping plate (62) are both hinged inside the cross-column (6). The lower end of the second clamping plate (62) forms branches corresponding to the fixed blocks (3) on both sides of the positioning block (2). After the abutting portion (63) is driven by the driving assembly, the lower end of the first clamping plate (61) is driven to approach and the lower end of the second clamping plate (62) is driven to approach.

4. A measuring tool for symmetry measurement according to claim 2, characterized in that: The driving assembly includes a driving column (54) slidably arranged inside the cross-column (6), and a cylinder (53) arranged on the cross-column (6) to drive the driving column (54) to slide between the abutting portions (63) of the first clamping plate (61) and between the abutting portions (63) of the second clamping plate (62). The driving column (54) is used to abut against the abutting portion (63) to drive the clamping portion to clamp.

5. A measuring tool for symmetry measurement according to claim 2, characterized in that: The lower end of the second clamping plate (62) where the branch is formed is connected with an abutting plate (64) that abuts against the side wall of the fixed block (3). Inside the cross-column (6), positioning plates (65) for the fixed blocks (3) to abut against are arranged side by side. The abutting plate (64) is used to abut the fixed block (3) onto the positioning plate (65).

6. The measuring tool for symmetry measurement according to claim 5, characterized in that: A slideway (71) is arranged inside the cross-column (6) between the second clamping plates (62). The lower end of the slideway (71) is located above the positioning plate (65), and the upper end of the slideway (71) penetrates through the side wall of the cross-column (6). An avoidance groove (611) for avoiding the slideway (71) is formed on the first clamping plate (61). The slideway (71) allows the first steel ball (41) and the second steel ball (42) to slide down and fall between the positioning plates (65). The upper end of the side wall of the fixed block (3) abuts against the positioning plate (65), and the lower end of the side wall of the fixed block (3) does not abut against the positioning plate (65).

7. A measuring tool for symmetry measurement according to claim 6, characterized in that: A sliding plate (72) is slidably connected to the inner wall of the cross-column (6). A through hole (711) for the end of the sliding plate (72) to slide into is formed at the lower end of the slideway (71). One end of the sliding plate (72) that slides into the through hole (711) is used to block the downward sliding of the first steel ball (41) or the second steel ball (42).

8. A measuring tool for symmetry measurement according to claim 7, characterized in that: A spring (621) is arranged between the second clamping plates (62). One end of the spring (621) is connected to one of the second clamping plates (62), and the other end of the spring (621) is connected to the other second clamping plate (62). The spring (621) is used to pull the upper ends of the second clamping plates (62) to approach each other and the lower ends to move away from each other. The sliding plate (72) slides on one side of the second clamping plate (62). An embedding groove (721) for the second clamping plate (62) to be embedded is formed at one end of the sliding plate (72) away from the slideway (71). The width of the groove of the embedding groove (721) is greater than the thickness of the second clamping plate (62).

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