Motor assembly gravity center measuring tool and method for predicting lifting hook and measuring and calculating gravity center position

Abstract

The invention discloses a motor assembly gravity center measuring tool and a method for predicting a lifting hook and measuring and calculating the gravity center position, aims to solve the technical problem that the lifting hook position and the gravity center of a combination need to be predicted depending on experience of an operator in the prior art, and belongs to the technical field of gravity center measuring tools. The device comprises a main measuring ruler, a gravity line simulation ruler a and a gravity line simulation ruler b, the gravity line simulation ruler a and the gravity line simulation ruler b can stretch out and draw back, one end of the gravity line simulation ruler a is rotationally connected with a sliding block a, and one end of the gravity line simulation ruler b is rotationally connected with a sliding block b. The other end of the gravity line simulation ruler a is rotatably connected with the other end of the gravity line simulation ruler b, and the sliding block a and the sliding block b can slide on the main measuring ruler.

Description

Technical Field

[0001] The invention belongs to the technical field of center of gravity measuring tools, and in particular relates to a motor assembly center of gravity measuring tool and a method for predicting a hook and measuring a center of gravity position. Background Art

[0002] The assembly of the motor stator and rotor requires the use of an assembly hoist (the main structure includes a hook and a bow) to lift the motor rotor. After the combination of the motor rotor and the assembly hoist (hereinafter referred to as the combination) is stationary, the motor rotor needs to be kept horizontal before being assembled with the motor stator. However, before lifting the motor rotor, the hook of the assembly hoist needs to be moved to the gravity line of the center of gravity of the combination. Usually, the center of gravity of the combination and this gravity line are predicted and found based on the experience of the operator. The operation process is that the operator moves the hook to the corresponding position of the gravity line of the center of gravity of the combination relative to the assembly hoist based on experience, and then lifts the motor rotor. If the motor rotor does not remain horizontal, it is necessary to continuously adjust the hook position and lift it again and again so that the hook is finally located on the gravity line of the combination, and then assemble the stator and rotor. Because the operator is mainly based on experience, the prediction error is large, the number of hook position adjustments is large, and the operation efficiency is low.

[0003] The technical solutions of the prior art are as follows: 1) By hanging objects, relying on the operator's experience, predict the position of the hook on the assembly spreader and the center of gravity of the assembly; 2) Predict the hook position based on the tilt state of the motor rotor during the last lift; 3) Adjust the position of the hook on the assembly sling several times, and move the hook to the gravity line at the center of gravity of the assembly so that the assembly is balanced and in a horizontal state; 4) Use observation to determine the horizontal state of the motor rotor.

[0004] The disadvantages of the prior art are as follows: 1) The operators rely on experience to predict the hook position and the center of gravity of the assembly, which is not accurate enough; 2) There is no quantitative analysis of the relationship between the hook position and the tilt state of the assembly, and the prediction of the hook position lacks data support; 3) The hook position needs to be adjusted many times and the operation time is long; 4) The observation method varies from person to person, and the judgment results have certain errors, which affects the motor assembly process and assembly quality; 5) The position of the center of gravity of the assembly cannot be calculated.

[0005] In addition, there are literatures that calculate the center of gravity of objects through geometric methods, support methods, theoretical calculation methods, etc.

[0006] The present invention mainly introduces a motor assembly center of gravity measuring tool, a method for predicting the position of a hook on an assembly hoist and a method for measuring the center of gravity position of a combination. The center of gravity measuring tool and method can improve the accuracy of predicting the position of the hook, calculate the approximate value of the center of gravity position of the combination, keep the motor rotor in a horizontal state after lifting, and facilitate the assembly of the motor stator and rotor. Summary of the invention

[0007] The purpose of the present invention is to provide a motor assembly center of gravity measuring tool and a method for predicting the hook and measuring the center of gravity position, which is used to solve the technical problem that the prior art needs to rely on the operator's experience to predict the hook position and the center of gravity of the assembly.

[0008] The present invention is achieved by adopting the following technical solutions: A motor-assembled center of gravity measuring tool comprises a main measuring scale and a gravity line simulation scale a and a gravity line simulation scale b. Both the gravity line simulation scale a and the gravity line simulation scale b can be extended and retracted. One end of the gravity line simulation scale a is rotatably connected to a slider a, and one end of the gravity line simulation scale b is rotatably connected to a slider b. The other end of the gravity line simulation scale a is rotatably connected to the other end of the gravity line simulation scale b, and the slider a and the slider b can slide on the main measuring scale.

[0009] When in use, move the hook to different positions, use the final assembly hoist to lift the motor rotor twice in advance, and after they are stationary, use the motor assembly gravity center measuring tool to measure relevant data to obtain the distances a1 and a2 from the center line of the hook to the right end face of the bow (i.e. the positions of slider b and slider a on the main measuring scale), the inclination angles α1 and α2 of the motor rotor, and use the motor assembly gravity center measuring tool to construct two gravity lines of the assembly through the gravity line simulation scale a and the gravity line simulation scale b. The two constructed gravity lines have an intersection point, which is the projection point of the center of gravity of the assembly, and the intersection point of the perpendicular line through the intersection point and the main measuring scale with the main measuring scale is the predicted position of the hook on the final assembly hoist.

[0010] Further preferably, the main measuring scale is provided with an angle measuring instrument to facilitate measuring the tilt angle of the suspended motor rotor.

[0011] Further preferably, a laser transmitter is provided at the position where the gravity line simulation ruler a and the gravity line simulation ruler b are rotatably connected, so as to facilitate rapid finding of the position point of the hook.

[0012] Further preferably, the gravity line simulation ruler a and the gravity line simulation ruler b can adopt the following structure: the gravity line simulation ruler a includes a rocker arm 1, the rocker arm 1 is slidably connected to a connecting rod 1, and the connecting rod 1 is slidably connected to a rocker arm 1; the gravity line simulation ruler b includes a rocker arm 2, the rocker arm 2 is slidably connected to a connecting rod 2, the connecting rod 2 is slidably connected to a rocker arm 2, and the rocker arm 1 and the rocker arm 2 are rotatably connected.

[0013] Further preferably, it also includes nut a and nut b, the main measuring scale is provided with a first sliding groove along the center line, the slider a can slide in the first sliding groove and is provided with a cylindrical extension a, a dial a is fixed at the root of the extension a, an external thread is provided on the cylindrical surface of the extension a, the gravity line simulation scale a is sleeved on the extension a through a light hole, and a pointer one is provided at the end connected to one end of the extension a, and the nut a is screwed into the extension a; the slider b can slide in the first sliding groove and is provided with a cylindrical extension b, a dial b is fixed at the root of the extension b, an external thread is provided on the cylindrical surface of the extension b, the gravity line simulation scale b is sleeved on the extension b through the light hole, and a pointer three is provided at the end connected to one end of the extension b, and the nut b is screwed into the extension b, the pointer on the gravity line simulation scale can be used to indicate the rotation angle of the gravity line simulation scale, and the function of the nut a and the nut b is to lock the rotation angle of the gravity line simulation scale.

[0014] Further preferably, the angle measuring instrument includes a support shaft, a dial c, a knob 2 and a pointer 2 with a counterweight, the support shaft is vertically fixed on the main measuring scale, the dial c, the knob 2 and the pointer 2 with a counterweight are sequentially sleeved on the support shaft, the support shaft is provided with a thread, the knob 2 is provided with an internal thread, the knob 2 is screwed on the support shaft, the part of the support shaft exposed from the pointer 2 is screwed with a nut c, a gap is retained between the nut c and the pointer 2, and the purpose of retaining the gap is to facilitate the rotation of the pointer 2 under the action of gravity.

[0015] Further preferably, it also includes a nut d, a connecting shaft is provided at one end of the gravity line simulation scale b, a light hole is provided at one end of the gravity line simulation scale a, one end of the gravity line simulation scale a and the nut d are assembled on the connecting shaft in sequence, and a knob 1 is also provided on the top of the connecting shaft, a laser emitter is fixed on the knob 1, and the laser emitter is controlled to open and close by a button.

[0016] Further preferably, it also includes screw 1, screw 2, screw 3 and screw 4, the rocker 1 is provided with a slide groove 1, the connecting rod 1 is provided with a small slider 1 at one end, the small slider 1 can slide in the slide groove 1, the small slider 1 is provided with a threaded hole, the screw 1 is installed in the threaded hole, the thread length of the screw 1 is greater than the thickness of the small slider 1, the connecting rod 1 is provided with a slide groove 2, the rocker 1 is provided with a small slider 2 at one end, the small slider 2 can slide in the slide groove 2, the small slider 2 is provided with a threaded hole, the screw 2 is installed in the threaded hole, and the screw 2 The thread length is greater than the thickness of the small slider two; the rocker arm two is provided with a slide groove three, and a small slider four is provided at one end of the connecting rod two. The small slider four can slide in the slide groove three, and a threaded hole is provided in the small slider four. The screw four is installed in the threaded hole, and the thread length of the screw four is greater than the thickness of the small slider four. The connecting rod two is provided with a slide groove four, and a small slider three is provided at one end of the rocker arm two. The small slider three can slide in the slide groove four, and a threaded hole is provided in the small slider three. The screw three is installed in the threaded hole, and the thread length of the screw three is greater than the thickness of the small slider three.

[0017] A method for predicting the position of a hook on an assembly spreader is implemented by the motor assembly gravity center measurement tool described above; Step 1: Place the motor assembly center of gravity measuring tool on a horizontal surface and rotate knob 2 to align the 0 line on the dial with the center line of pointer 2.

[0018] Step 2: Move the hook to different positions, and use the assembly hoist to lift the motor rotor twice in advance. After the motor is stationary, use the motor assembly center of gravity measurement tool to measure the relevant data to obtain the distance a1 and a2 from the center line of the hook to the right end face of the bow, and the inclination angles α1 and α2 of the motor rotor.

[0019] Step three, use the motor to assemble the center of gravity measuring tool to construct the gravity line passing through the center of gravity of the assembly. The two constructed gravity lines are realized by moving slider a and slider b, and rotating gravity line simulation scale a and gravity line simulation scale b. The two constructed gravity lines have an intersection point, which is defined as intersection point 1. Intersection point 1 is the projection point of the center of gravity of the assembly on the two-dimensional plane. The vertical line passing through intersection point 1 and perpendicular to the main measuring scale will have an intersection point with the main measuring scale. The intersection point is defined as intersection point 2. Intersection point 2 is the predicted position of the hook on the final assembly hanger.

[0020] A method for measuring the center of gravity position of an assembly is implemented by using the motor assembly center of gravity measuring tool.

[0021] Since the motor rotor and assembly hanger can be regarded as objects with regular shape and uniform mass, which are symmetrical about the plane, the center of gravity of the motor rotor is on the symmetry plane.

[0022] Step 1: Use the center of gravity measurement tool to keep the direction and position of the gravity line of one structure unchanged, and realize the construction of the gravity line through the gravity line simulation ruler b; change the direction and position of the gravity line of another structure, and realize the construction of the gravity line through the gravity line simulation ruler a.

[0023] Step 2, move the slider a to the position of the hook when the actual motor rotor is in a horizontal state. The two constructed gravity lines have an intersection point, which is defined as intersection point 4, and intersection point 4 is the center of gravity of the assembly.

[0024] Step 3: Establish a spatial rectangular coordinate system so that its XOY plane is on the symmetry plane, the origin of the coordinate system is located at the right end of the center line of the upper plate of the bow, the positive direction of X points to the right along the center line of the upper plate of the bow, and the positive direction of Y points upward perpendicular to the center line of the upper plate of the bow. The coordinates of the center of gravity of the assembly are (-a0, -b0, c0), where a0 is the distance from the center line of the hook to the origin of the coordinate system when the motor rotor is in a horizontal state, b0 is the length of the gravity line simulation ruler a, and c0=0.

[0025] The present invention has the following beneficial effects 1. It effectively solves the problem of making the hoisted motor rotor in a horizontal state and completing the motor stator and rotor assembly without relying on the operator's experience; 2. It provides data for the force balance state of the assembly after lifting, so as to quantitatively analyze the relationship between the hook position and the inclination angle of the assembly, and improve the accuracy of the hook position prediction; 3. Reduce the number of hook position adjustments and improve work efficiency; 4. Provides a tool to determine the horizontal state of the motor rotor, reducing the error of manual judgment results; The present invention does not use complicated calculation formulas or measure the magnitude of force, but adopts tool simulation to simplify the measurement and calculation process, thereby improving calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It shows the schematic diagram of the final assembly hoist.

[0029] Figure 2 Schematic diagram showing a hook lifting the motor rotor.

[0030] Figure 3 The present invention measures Figure 2 Schematic diagram of the distance a1 from the center line of the middle hook to the right end face of the bow.

[0031] Figure 4 The present invention measures Figure 2 Schematic diagram of the motor rotor inclination angle α1.

[0032] Figure 5 A schematic diagram showing the secondary hook lifting the motor rotor of the present invention.

[0033] Figure 6 A schematic diagram showing the predicted position of a hook on an assembly hanger according to a fifth embodiment of the present invention.

[0034] Figure 7 A schematic diagram showing the horizontal state of the motor rotor of the present invention.

[0035] Figure 8 A flowchart of the sixth embodiment of the present invention is shown.

[0036] Fig. 9 A schematic diagram showing the position of the center of gravity of the measuring assembly according to the seventh embodiment of the present invention.

[0037] Fig.10 A flow chart showing the seventh embodiment of the present invention.

[0038] Fig.11 A schematic diagram showing the structure of the main measuring ruler of the present invention is shown.

[0039] Fig.12 A schematic diagram showing the structure of the angle measuring instrument of the present invention is shown.

[0040] Fig.13 A schematic diagram showing the rotational connection between the first and second swing arms of the present invention.

[0041] Fig.14 Schematic diagram showing the rotation connection between the gravity line simulation ruler a and the main measuring ruler of the present invention Figure 1 .

[0042] Fig.15 Schematic diagram showing the rotation connection between the gravity line simulation ruler a and the main measuring ruler of the present invention Figure 2 .

[0043] Fig.16 A schematic diagram showing the sliding connection between the rocker arm 1 and the connecting rod 1 of the present invention.

[0044] In the figure: 1-main measuring ruler, 2-slider a, 3-pointer 1, 4-rocker 1, 5-nut a, 6-bolt 1, 7-end plate 1, 8-bolt 2, 9-small slider 1, 10-screw 1, 11-connecting rod 1, 12-small slider 2, 13-screw 2, 14-rocker 1, 15-connecting shaft, 16-knob 1, 17-button, 18-laser transmitter, 19-rocker 2, 20-screw 3, 21-small slider 3, 22-connecting rod 2, 23-screw 4, 24-small slider 4, 25-rocker 2, 26-dial c, 27-support shaft, 28-knob 2, 29-pointer 2, 30-slider b, 31-pointer 3, 32-nut b, 33-hook, 34-bow, 35-motor rotor. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0046] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0048] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0049] Embodiment 1, a motor-assembled center of gravity measuring tool comprises a main measuring scale 1 and a gravity line simulation scale a and a gravity line simulation scale b. Both the gravity line simulation scale a and the gravity line simulation scale b can be extended and retracted. One end of the gravity line simulation scale a is rotatably connected to a slider a2, and one end of the gravity line simulation scale b is rotatably connected to a slider b30. The other end of the gravity line simulation scale a is rotatably connected to the other end of the gravity line simulation scale b, and the slider a2 and the slider b30 can slide on the main measuring scale 1.

[0050] The main measuring scale 1 is provided with an angle measuring instrument.

[0051] A laser emitter 18 is provided at the position where the gravity line simulation scale a and the gravity line simulation scale b are rotatably connected.

[0052] The gravity line simulation ruler a includes a rocker arm 4, which is slidably connected to a connecting rod 11, which is slidably connected to a pendulum rod 14; the gravity line simulation ruler b includes a rocker arm 25, which is slidably connected to a connecting rod 22, which is slidably connected to a pendulum rod 29, and the pendulum rod 14 and the pendulum rod 2 19 are rotationally connected.

[0053] It also includes screw 10, screw 2 13, screw 4 23 and screw 3 20, rocker 14 is provided with a slide groove 1, one end of connecting rod 11 is provided with a small slider 9, the small slider 9 can slide in the slide groove 1, a threaded hole is provided in the small slider 9, screw 10 is installed in the threaded hole, the thread length of screw 10 is greater than the thickness of the small slider 9, connecting rod 11 is provided with a slide groove 2, one end of rocker rod 14 is provided with a small slider 2 12, the small slider 2 12 can slide in the slide groove 2, a threaded hole is provided in the small slider 2 12, screw 2 13 is installed in the threaded hole, the thread length of screw 2 13 Greater than the thickness of the small slider 2 12; the rocker 2 25 is provided with a slide groove 3, a small slider 4 24 is provided at one end of the connecting rod 2 2, the small slider 4 24 can slide in the slide groove 3, a threaded hole is provided in the small slider 4 24, a screw 4 23 is installed in the threaded hole, and the thread length of the screw 4 23 is greater than the thickness of the small slider 4 24, the connecting rod 2 22 is provided with a slide groove 4, and a small slider 3 21 is provided at one end of the rocker 2 19, the small slider 3 21 can slide in the slide groove 4, a threaded hole is provided in the small slider 3 21, a screw 3 20 is installed in the threaded hole, and the thread length of the screw 3 20 is greater than the thickness of the small slider 3 21.

[0054] Working principle: The main measuring scale 1 and the slider a2 and the slider b30 form a moving pair, the rocker arm 14 and the slider a2 form a rotating pair, the rocker arm 25 and the slider b30 form a rotating pair, the small slider 19 is fixedly connected to the connecting rod 11 and forms a moving pair with the rocker arm 14, the small slider 21 is fixedly connected to the rocker arm 14 and forms a moving pair with the connecting rod 11, the small slider 4 24 is fixedly connected to the connecting rod 22 and forms a moving pair with the rocker arm 25, the small slider 3 21 is fixedly connected to the rocker arm 2 19 and forms a moving pair with the connecting rod 22, and the rocker arm 14 and the rocker arm 2 19 form a rotating pair.

[0055] Embodiment 2 also includes nut a5 and nut b32. The main measuring ruler 1 is provided with a first slide groove along the center line. The slider a2 can slide in the first slide groove and is provided with a cylindrical extension a. A scale plate a is fixed at the root of the extension a. An external thread is provided on the cylindrical surface of the extension a. The gravity line simulation ruler a is sleeved on the extension a through a light hole, and a pointer 3 is provided at the end connected to one end of the extension a. The nut a5 is screwed into the extension a. The slider b30 can slide in the first slide groove and is provided with a cylindrical extension b. A scale plate b is fixed at the root of the extension b. An external thread is provided on the cylindrical surface of the extension b. The gravity line simulation ruler b is sleeved on the extension b through a light hole, and a pointer 31 is provided at the end connected to one end of the extension b. The nut b32 is screwed into the extension b. The main measuring ruler 1 is provided with an end plate 7 at the end of the first slide groove. The end plate 7 is fixed to the right end face of the main measuring ruler 1 by bolts 1 6 and 2 8.

[0056] Working principle: Loosen nut a5, gravity line simulation scale a can rotate with slider a2, and slider a2 can slide with main measuring scale 1; loosen nut b32, gravity line simulation scale b can rotate with slider b30, and slider b30 can slide with main measuring scale 1.

[0057] During the rotation of the gravity line simulation scale a and the gravity line simulation scale b, the pointer one 3 and the pointer three 31 can indicate the rotation angle.

[0058] Embodiment three, the angle measuring instrument comprises a support shaft 27, a dial c26, a knob 28 and a pointer 29 with a counterweight, the support shaft 27 is vertically fixed on the main measuring scale 1, the dial c26, the knob 28 and the pointer 29 with a counterweight are sequentially sleeved on the support shaft 27, the support shaft 27 is provided with a thread, the knob 28 is provided with an internal thread, the knob 28 is screwed on the support shaft 27, the part of the support shaft 27 exposed from the pointer 29 is screwed with a nut c, and a gap is retained between the nut c and the pointer 29.

[0059] Working principle: The function of the knob 28 is to fix the position of the scale plate c26, and the function of the nut c is to retain the space required for the movement of the pointer 29 while preventing the pointer 29 from falling.

[0060] Embodiment 4 also includes a nut d, a connecting shaft 15 is provided at one end of the gravity line simulation scale b, a light hole is provided at one end of the gravity line simulation scale a, one end of the gravity line simulation scale a and the nut d are sequentially assembled on the connecting shaft 15, a knob 16 is also provided on the top of the connecting shaft 15, a laser emitter 18 is fixed on the knob 16, the laser emitter 18 is controlled to open and close by a button 17, and the knob 16 and the connecting shaft 15 form a rotating pair.

[0061] Working principle: The rotation of knob 16 can drive the laser emitter 18 to rotate. The laser emitter 18 is used to quickly locate the position of the hook 33 on the main measuring scale 1. The function of nut d is to lock the rotation of the rotating parts of the gravity line simulation scale a and the gravity line simulation scale b.

[0062] It should be noted that the gravity line simulation scale a and the gravity line simulation scale b can be provided with scales for measuring distance. In the present embodiment, the misaligned installation of the gravity line simulation scale a and the gravity line simulation scale b on the connecting shaft 15 will not affect the final readings, and are all within the normal error range. Of course, it is more preferred that the gravity line simulation scale a can be assembled on one end of the connecting shaft 15 and be set to a "Z" type bend, so that the gravity line simulation scale a and the gravity line simulation scale b can be provided with scale parts in the same plane as the main measuring scale.

[0063] Embodiment 5, a method for predicting the position of a hook on an assembly hanger, is implemented by the motor assembly gravity center measurement tool described above; Step 1: Place the motor assembly center of gravity measuring tool on a horizontal surface, and rotate the knob 28 to align the scale line 0 with the center line of the pointer 29.

[0064] Step 2, move the hook 33 to different positions, and use the final assembly lifting device to lift the motor rotor 35 twice in advance. After they are stationary, use the motor assembly center of gravity measurement tool to measure relevant data to obtain the distances a1 and a2 from the center line of the hook 33 to the right end face of the bow 34, and the inclination angles α1 and α2 of the motor rotor 35.

[0065] The specific operation method can be taken as follows: S21, first remove the gravity line simulation scale a and the gravity line simulation scale b from the motor assembly center of gravity measuring tool, and only place the main measuring scale 1 against the hanging bow 34.

[0066] S22, the main measuring ruler 1 is provided with scale lines, and the 0 scale line is aligned with the position of the center line of the right end surface of the hanging bow 34 during measurement.

[0067] S221, move the hook 33 to a position of the final assembly hoist, lift the motor rotor 35 by the final assembly hoist, and after it stops, use the motor assembly center of gravity measuring tool to measure the distance a1 from the center line of the hook 33 to the right end face of the bow 34 (read by the scale line on the main measuring ruler 1), and the inclination angle α1 of the motor rotor 35 (read by the angle measuring instrument on the main measuring ruler 1).

[0068] S222, move the hook 33 to another position of the final assembly lifting device, measure the distance a2 from the center line of the hook 33 to the right end surface of the bow 34, and the inclination angle α2 of the motor rotor 35.

[0069] Step three, use the motor to assemble the center of gravity measuring tool to construct the gravity line passing through the center of gravity of the assembly. The two constructed gravity lines are realized by moving slider a and slider b, and rotating gravity line simulation scale a and gravity line simulation scale b. The two constructed gravity lines have an intersection point, which is defined as intersection point 1. Intersection point 1 is the projection point of the center of gravity of the assembly on the two-dimensional plane. The vertical line passing through intersection point 1 and perpendicular to the main measuring scale 1 will have an intersection point with the main measuring scale 1. The intersection point is defined as intersection point 2. Intersection point 2 is the predicted position of the hook 33 on the final assembly hanger.

[0070] The specific operation method is as follows: S31, loosen nut a5, nut b32, screw one 10, screw two 13, screw four 23, screw three 20 in sequence to allow slider a2, slider b30, small slider one 9, small slider two 12, small slider four 24, small slider three 21 to move.

[0071] S32, move the slider a2 and the slider b30 respectively so that the distances from their midlines to the right end surface of the main measuring scale 1 are a2 and a1 respectively, tighten the nuts a5 and b32 to fix the slider a2 and the slider b30.

[0072] S33, rotate rocker 1 4 and rocker 2 25 respectively, so that the angle pointed by pointer 1 3 is α2, the angle pointed by pointer 3 31 is α1, tighten screw 1 10, screw 2 13, screw 4 23, screw 3 20, and fix small slider 1 9, small slider 2 12, small slider 4 24, and small slider 3 21.

[0073] S34, the two constructed gravity lines have an intersection point, turn the knob 16 to make its rotation angle -α1 (clockwise is negative, counterclockwise is positive), press the button, and the laser emitted from the laser transmitter 18 is projected onto the main measuring scale 1. The light spot is the predicted position of the hook 33 on the final assembly hanger.

[0074] It should be noted that since the pendulum rod 19 swings at an angle of α1, in order to make the laser emitter 18 emit rays perpendicular to the main measuring scale 1, the laser emitter 18 needs to be rotated in the opposite direction at an angle of α1 during operation.

[0075] This method is used to predict the position of the hook 33 on the final assembly lifting device, and can make the motor rotor 35 quickly stop and be in a horizontal state after being lifted.

[0076] It should be noted that due to the influence of factors such as the structure, material, and manufacturing process of the actual motor rotor 35 and the bow 34, the predicted point of the position of the hook 33 may deviate from the actual point. By fine-tuning the position of the hook 33 and waiting for it to come to rest, the motor assembly center of gravity measuring tool is placed on the upper plane of the assembly hanger, and the scale pointed to by pointer 29 is observed. If the center line of pointer 29 points to the 0 scale line, the motor rotor 35 is horizontal; otherwise, the motor rotor 35 is not horizontal, and the position of the hook 33 is continued to be adjusted until the motor rotor 35 remains horizontal. In this way, the predicted point will quickly approach the actual point, thereby reducing the number of times the position of the hook 33 is adjusted; at the same time, the distance a0 from the center line of the hook 33 to the right end face of the bow 34 is measured.

[0077] Example 6: Measuring multiple sets of data (a1, a2...a n ), (α1, α2…α n ), regression analysis is used to establish a functional relationship y=f(x), where: y is the inclination angle of the motor rotor 35, and x is the distance from the center line of the hook 33 to the right end face of the bow 34.

[0078] The position of the hook 33 on the assembly hanger is predicted through a functional relationship when the motor rotor 35 is horizontal; the predicted position is simulated and evaluated through structural features such as the main measuring scale 1 and the gravity line simulation scale.

[0079] Embodiment 7, a method for measuring the center of gravity position of an assembly is implemented by the above-mentioned motor assembly center of gravity measuring tool.

[0080] Since the motor rotor 35 and the assembly hanger can be regarded as objects with regular shapes and uniform masses, and are symmetrical about a plane, the center of gravity of the motor rotor 35 is on the symmetry plane.

[0081] Step 1: Use the center of gravity measurement tool to keep the direction and position of the gravity line of one structure unchanged, and realize the construction of the gravity line through the gravity line simulation ruler b; change the direction and position of the gravity line of another structure, and realize the construction of the gravity line through the gravity line simulation ruler a.

[0082] Step 2, move the slider a2 to the position of the hook 33 when the actual motor rotor 35 is in a horizontal state. The two constructed gravity lines have an intersection point, which is defined as intersection point 4, and intersection point 4 is the center of gravity of the assembly.

[0083] The specific steps are as follows: S11, loosen nut a5, screw two 13, screw three 20, move slider a2, make the distance from the center line of slider a2 to the right end face of the main measuring scale 1 is a0, tighten nut a5, screw two 13, screw three 20, fix slider a2, small slider two 12, small slider three 21.

[0084] Step three, establish a spatial rectangular coordinate system so that its XOY plane is located on the symmetry plane, the origin of the coordinate system is located at the right end of the center line of the upper plate of the bow 34, and the approximate value of the center of gravity coordinate of the combination is (-a0, -b0, c0), where a0 is the distance from the center line of the hook 33 to the origin of the coordinate system when the motor rotor 35 is in a horizontal state, b0 is the length of the gravity line simulation ruler a, c0=0, or the value of b0 is calculated by the formula b0=(a1-a0)cotα1.

[0085] This method is used to measure the center of gravity position of the motor rotor 35 and the assembly hanger assembly.

[0086] Preferably, rocker arm 1 4, connecting rod 1 11, pendulum arm 1 14, rocker arm 2 25, connecting rod 2 2 and pendulum arm 2 19 are provided with scales, which can be used to measure distance. When the motor assembly center of gravity measuring tool is used for measurement, the b0 value can be directly obtained, that is, the approximate value of the center of gravity coordinate of the assembly can be observed to be (-a0, -b0, c0), where c0=0.

[0087] The present invention has the following advantages: 1) The present invention uses a method of measuring distance and inclination by a tool to obtain relevant data, thereby quantitatively analyzing the relationship between the position of the hook 33 and the inclination of the assembly, improving the accuracy of the prediction of the position of the hook 33, and reducing the number of times the position of the hook 33 is adjusted.

[0088] 2) The present invention predicts the position of the hook 33 on the assembly hanger by constructing a gravity line without relying on the experience of the operators, so that the lifted motor rotor 35 is in a horizontal state, the motor stator and rotor assembly is completed, the operation efficiency is improved, the accuracy of the position prediction of the hook 33 is improved, and the number of times the position of the hook 33 is adjusted is reduced.

[0089] 3) The present invention adopts a simplified physical simulation method to measure the center of gravity of the assembly, solves the approximate value of the center of gravity of the assembly, and simplifies the measurement and calculation process.

[0090] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. Motor assembly center of gravity measurement tool, characterized by: The invention comprises a main measuring scale (1) and a gravity line simulation scale a and a gravity line simulation scale b, wherein the gravity line simulation scale a and the gravity line simulation scale b are both capable of extension and retraction, one end of the gravity line simulation scale a is rotatably connected to a slider a (2), one end of the gravity line simulation scale b is rotatably connected to a slider b (30), the other end of the gravity line simulation scale a is rotatably connected to the other end of the gravity line simulation scale b, and the slider a (2) and the slider b (30) are capable of sliding on the main measuring scale (1).

2. The motor assembly center of gravity measuring tool according to claim 1, characterized in that: The main measuring ruler (1) is provided with an angle measuring instrument.

3. The motor assembly center of gravity measuring tool according to claim 1, characterized in that: A laser emitter (18) is provided at the position where the gravity line simulation scale a and the gravity line simulation scale b are rotatably connected.

4. The motor assembly center of gravity measuring tool according to claim 1, characterized in that: The gravity line simulation ruler a comprises a rocker arm 1 (4), wherein the rocker arm 1 (4) is slidably connected to a connecting rod 1 (11), and the connecting rod 1 (11) is slidably connected to a swing rod 1 (14); the gravity line simulation ruler b comprises a rocker arm 2 (25), wherein the rocker arm 2 (25) is slidably connected to a connecting rod 2 (22), and the connecting rod 2 (22) is slidably connected to a swing rod 2 (19), and the swing rod 1 (14) and the swing rod 2 (19) are rotationally connected.

5. The motor assembly center of gravity measuring tool according to claim 1, characterized in that: It also includes a nut a (5) and a nut b (32), wherein the main measuring scale (1) is provided with a first slide groove along the center line, the slider a (2) can slide in the first slide groove and is provided with a cylindrical extension a, a dial a is fixed at the root of the extension a, an external thread is provided on the cylindrical surface of the extension a, the gravity line simulation scale a is sleeved on the extension a through a light hole, and a pointer one (3) is provided at the end connected to one end of the extension a, and the nut a (5) is screwed into the extension a; the slider b (30) can slide in the first slide groove and is provided with a cylindrical extension b, a dial b is fixed at the root of the extension b, an external thread is provided on the cylindrical surface of the extension b, the gravity line simulation scale b is sleeved on the extension b through a light hole, and a pointer three (31) is provided at the end connected to one end of the extension b, and the nut b (32) is screwed into the extension b.

6. The motor assembly center of gravity measuring tool according to claim 2, characterized in that: The angle measuring instrument comprises a support shaft (27), a scale plate c (26), a second knob (28) and a second pointer (29) with a counterweight, wherein the support shaft (27) is vertically fixed on the main measuring scale (1), the scale plate c (26), the second knob (28) and the second pointer (29) with a counterweight are sequentially sleeved on the support shaft (27), the support shaft (27) is provided with a thread, the second knob (28) is internally provided with an internal thread, the second knob (28) is screwed on the support shaft (27), and a nut c is screwed on a portion of the support shaft (27) exposed from the second pointer (29), and a gap is retained between the nut c and the second pointer (29).

7. The motor assembly center of gravity measuring tool according to claim 3, characterized in that: It also includes a nut d, a connecting shaft (15) is provided at one end of the gravity line simulation scale b, a light hole is provided at one end of the gravity line simulation scale a, one end of the gravity line simulation scale a and the nut d are sequentially assembled on the connecting shaft (15), a knob 1 (16) is also provided on the top of the connecting shaft (15), a laser emitter (18) is fixed on the knob 1 (16), and the laser emitter (18) is controlled to be opened and closed by a button (17).

8. The motor assembly center of gravity measuring tool according to claim 4, characterized in that: The invention also comprises a screw 1 (10), a screw 2 (13), a screw 4 (23) and a screw 3 (20), wherein the rocker 1 (4) is provided with a slide groove 1, a small slider 1 (9) is provided at one end of the connecting rod 1 (11), the small slider 1 (9) can slide in the slide groove 1, a threaded hole is provided in the small slider 1 (9), the screw 1 (10) is installed in the threaded hole, the thread length of the screw 1 (10) is greater than the thickness of the small slider 1 (9), the connecting rod 1 (11) is provided with a slide groove 2, the rocker 1 (14) is provided with a small slider 2 (12) at one end, the small slider 2 (12) can slide in the slide groove 2, a threaded hole is provided in the small slider 2 (12), the screw 2 (13) is installed in the threaded hole, the thread of the screw 2 (13) The length is greater than the thickness of the small slider 2 (12); the rocker 2 (25) is provided with a slide groove 3, and a small slider 4 (24) is provided at one end of the connecting rod 2 (22). The small slider 4 (24) can slide in the slide groove 3, and a threaded hole is provided in the small slider 4 (24). The screw 4 (23) is installed in the threaded hole. The thread length of the screw 4 (23) is greater than the thickness of the small slider 4 (24). The connecting rod 2 (22) is provided with a slide groove 4, and a small slider 3 (21) is provided at one end of the rocker 2 (19). The small slider 3 (21) can slide in the slide groove 4, and a threaded hole is provided in the small slider 3 (21). The screw 3 (20) is installed in the threaded hole. The thread length of the screw 3 (20) is greater than the thickness of the small slider 3 (21).

9. A method for predicting the position of a hook on an assembly spreader, characterized in that: This is achieved by the motor assembly center of gravity measurement tool described in claim 6; Step 1: Place the motor assembly center of gravity measuring tool on a horizontal surface, and rotate knob 2 (28) to align the 0 line on the dial with the center line of pointer 2 (29); Step 2, move the hook (33) to different positions, lift the motor rotor (35) twice in advance by using the final assembly lifting device, wait for the motor rotor to come to rest, and then use the motor assembly center of gravity measurement tool to measure relevant data to obtain the distances a1 and a2 from the center line of the hook (33) to the right end surface of the lifting bow (34), and the inclination angles α1 and α2 of the motor rotor (35); Step 3, use the motor assembly gravity center measurement tool to construct the gravity line passing through the gravity center of the assembly. The two constructed gravity lines are realized by moving slider a and slider b, rotating gravity line simulation scale a and gravity line simulation scale b. The two constructed gravity lines have an intersection point, which is defined as intersection point 1. Intersection point 1 is the projection point of the gravity center of the assembly on the two-dimensional plane. A vertical line passing through intersection point 1 and perpendicular to the main measuring scale (1) will intersect with the main measuring scale (1). This intersection point is defined as intersection point 2. Intersection point 2 is the predicted position of the hook (33) on the final assembly hanger.

10. A method for measuring the center of gravity of a combination, characterized in that: This is achieved by using the motor assembly center of gravity measurement tool described in any one of claims 1 to 8; Since the motor rotor (35) and the assembly hanger can be regarded as objects with regular shape and uniform mass, and are symmetrical about the plane, the center of gravity of the motor rotor (35) is on the symmetry plane; Step 1: Use the gravity center measurement tool to keep the direction and position of the gravity line of one structure unchanged, and use the gravity line simulation ruler b to realize the construction of the gravity line; change the direction and position of the gravity line of another structure, and use the gravity line simulation ruler a to realize the construction of the gravity line; Step 2, moving the slider a (2) to the position of the hook (33) when the actual motor rotor (35) is in a horizontal state, the two constructed gravity lines have an intersection point, and the intersection point is defined as intersection point 4, and intersection point 4 is the center of gravity of the assembly; Step 3, establish a spatial rectangular coordinate system so that its XOY plane is located on the symmetry plane, the origin O of the coordinate system is located at the right end of the center line of the upper plate of the bow (34), the positive direction of X points to the right along the center line of the upper plate of the bow (34), and the positive direction of Y points to the upper side perpendicular to the center line of the upper plate of the bow (34). The coordinates of the center of gravity of the combination are (-a0, -b0, c0), where a0 is the distance from the center line of the hook (33) to the origin of the coordinate system when the motor rotor is in a horizontal state, b0 is the length of the gravity line simulation ruler a, and c0=0.

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