Coaxiality detection device of engine main shaft

Abstract

The utility model relates to the technical field of engine unit assembly, in particular to an engine main shaft coaxiality detection device, which comprises a base, a side plate and a main shaft, the side plate is fixedly connected to one side of the top end of the base, the outer side of the main shaft is provided with a main shaft coaxiality measurement structure, and the other side above the base is provided with a coupler clamping and fixing structure. According to the coaxiality detection device of the engine main shaft, a positioning magnetic block adopts a magnet structure with a square notch formed in the side wall of one side, a clamping block is a square metal iron block and can be transversely inserted into the inner side of the positioning magnetic block to be adsorbed and fixed, and meanwhile, the upper end and the lower end of the clamping block are limited by the notches in the inner side of the positioning magnetic block, so that when an extension rod rotates, the positioning magnetic block is fixed by the clamping block; the clamping block and the internal dial indicator can be stably fixed in situ and do not deflect along with inertia and centrifugal force generated by rotation of the extension rod, and the measurement position of the dial indicator is directly stabilized.

Description

Technical Field

[0001] This utility model relates to the field of engine assembly technology, specifically to a coaxiality detection device for an engine main shaft. Background Technology

[0002] The main shaft refers to the shaft that receives power from an engine or electric motor and transmits it to other components. The main shaft, also known as the "optical axis," is a diameter that exhibits symmetry within an optical system. For example, the main axis of a spherical mirror is a straight line perpendicular to the center of the mirror surface; the main axis of a lens or optical system is the line connecting the centers of the lens surfaces.

[0003] For example, the authorization announcement number "CN222364533U" is titled "A Generator Assembly Coaxiality Testing Fixture." By rotating the engine spindle, the fixture and dial indicator rotate with the engine spindle, realistically simulating the rotation of the engine spindle relative to the coupling. This allows for dynamic testing of the coaxiality between the coupling and the engine spindle, resulting in higher testing accuracy. However, existing generator assembly coaxiality testing fixtures measure coaxiality by rotating the spindle without rotating the coupling. The accuracy of the measurement relies entirely on the changes in the dial indicator reading. The dial indicator is only attached to the outside of the positioning component by a magnetic block. Since the positioning component needs to rotate with the engine spindle, the magnetic block also needs to rotate. During the rotation of the magnetic block, it is subject to centrifugal force and inertia, resulting in a slight deviation to the outside of the rotation direction. Therefore, the value measured by the dial indicator will be larger than the actual spindle concentricity, affecting the testing accuracy of the engine spindle coaxiality.

[0004] Meanwhile, existing generator assembly coaxiality testing fixtures rely on dial indicators that rotate against the outside of the coupling to perform the test. However, the dial indicator measures the circumference of the outer wall of the coupling. When the outer wall of the coupling is a uniform circle, the coaxiality measurement result is naturally correct. However, when the outer wall of the coupling has some pits and unevenness, the dial indicator tip will contact the pits and unevenness of the coupling, causing the measurement result to fluctuate and affecting the reliability of the coaxiality measurement data. Utility Model Content

[0005] The purpose of this invention is to solve the problems of poor measurement accuracy and unreliable measurement data results of existing generator assembly coaxiality testing fixtures, and to propose a coaxiality testing device for engine main shaft.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] Design a coaxiality detection device for an engine main shaft, including a base, a side plate and a main shaft. One end of the main shaft is rotatably connected to a coupling. The side plate is fixedly connected to one side of the top of the base. A main shaft coaxiality measuring structure is provided on the outer side of the main shaft. A coupling clamping and fixing structure is provided on the other side above the base. An engine main shaft positioning structure is provided on the inner side of the side plate.

[0008] Preferably, the spindle coaxiality measuring structure includes clamping arc plates and extension rods. Two clamping arc plates are movably sleeved on the outside of the spindle. Splicing plates are fixedly connected to the side walls of the two clamping arc plates. Locking bolts are threadedly connected to the inner sides of the two splicing plates. Two extension rods are fixedly connected to the outer walls of the clamping arc plates. A positioning magnetic block is fixedly installed at one end of each extension rod. A locking block is movably engaged inside the positioning magnetic block. A dial indicator is fixedly installed inside the locking block.

[0009] Preferably, the other end of the two extension rods is fixedly equipped with a rotating handle, and the lower ends of the two dial indicators are slidably connected to the outer wall of the coupling.

[0010] Preferably, two crossbeams are fixedly installed on the side walls of the two extension rods, and marking pens are fixedly connected to the ends of the two crossbeams. The ends of the two marking pens slide against the side walls of the coupling.

[0011] Preferably, the coupling clamping and fixing structure includes a support frame and a double-ended screw. The support frame is fixedly connected to one side of the top of the base. The double-ended screw is rotatably connected to the inner side of the support frame. Clamping blocks are threadedly connected to both sides of the double-ended screw. A turning wheel is fixedly connected to the top of the double-ended screw. The inner walls of the two clamping blocks abut against the outer wall of the coupling.

[0012] Preferably, the engine main shaft positioning structure includes an electric push rod and a positioning block. The electric push rod is fixedly connected to the inner wall of the side plate, and a rotating seat is fixedly connected to the front end of the electric push rod. The positioning block is rotatably installed on the inner side of the rotating seat, and the other end of the positioning block is movably connected to the end of the main shaft.

[0013] The coaxiality detection device for engine main shaft proposed in this utility model has the following advantages: the positioning magnetic block adopts a magnet structure with a square slot cut on one side wall, and the clamping block is a square metal block. The clamping block can be inserted horizontally into the inside of the positioning magnetic block for adsorption and fixation. At the same time, both the upper and lower ends of the clamping block are restricted by the inner slot of the positioning magnetic block. Therefore, when the extension rod rotates, the clamping block and the internal dial indicator will be relatively stably fixed in the original position and will not deviate due to the inertia and centrifugal force generated by the rotation of the extension rod, thus directly stabilizing the measurement position of the dial indicator.

[0014] The crossbeams are welded laterally to the outer wall of the extension rod. Marking pens capable of applying color markings are fixed to the ends of the two crossbeams. The tips of the marking pens contact the fixed side wall of the coupling. Therefore, when the spindle is manually rotated, the marking pen can leave a circular mark on the outside of the coupling while rotating. Finally, the roundness of the circle drawn by the marking pen can be used as a comparison with the dial indicator measurement data. For example, if the circle drawn by the marking pen is relatively round, but the dial indicator measurement data indicates a difference in coaxiality, it can be determined that the reliability of the measurement result is insufficient. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 for Figure 1 A frontal sectional view;

[0017] Figure 3 for Figure 1 A side sectional view;

[0018] Figure 4 for Figure 2 Enlarged sectional view of section A in the middle;

[0019] Figure 5 for Figure 2 Enlarged sectional view of section B in the middle;

[0020] Figure 6 for Figure 2 Enlarged sectional view of section C.

[0021] In the diagram: 1. Base, 2. Side plate, 3. Main shaft, 4. Coupling, 5. Main shaft coaxiality measuring structure, 51. Clamping arc plate, 52. Splicing plate, 53. Locking bolt, 54. Extension rod, 55. Positioning magnetic block, 56. Clamping block, 57. Dial indicator, 61. Crossbeam, 62. Marking pen, 7. Rotating handle, 8. Coupling clamping and fixing structure, 81. Support frame, 82. Tightening wheel, 83. Double-ended screw, 84. Clamping block, 9. Engine main shaft positioning structure, 91. Electric push rod, 92. Rotating seat, 93. Positioning block. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings: Example 1:

[0023] Please see Figure 1-6In this embodiment, an engine spindle coaxiality detection device includes a base 1, a side plate 2, and a spindle 3. One end of the spindle 3 is rotatably connected to a coupling 4. The center point of the engine spindle 3 is rotatably connected to the center point of the coupling 4. The side plate 2 is fixedly connected to one side of the top of the base 1. The side plate 2 is made of a metal plate welded to the top of the base 1. A spindle coaxiality measuring structure 5 is provided on the outer side of the spindle 3. A coupling clamping and fixing structure 8 is provided on the other side above the base 1. An engine spindle positioning structure 9 is provided on the inner side of the side plate 2.

[0024] The spindle coaxiality measuring structure 5 includes clamping arc plates 51 and extension rods 54. Two clamping arc plates 51 are movably sleeved on the outside of the spindle 3. The clamping arc plates 51 are made of two semicircles on each side, with diameters matching those of the spindle 3. The two clamping arc plates 51 can be clamped in the middle position on the outside of the spindle 3, and then the two side splicing plates 52 will fit together. Fixing is achieved by rotating and tightening the locking bolts 53. Therefore, the clamping arc plates 51, along with the two side extension rods 54, can be fixed to the outside of the spindle 3. The side walls of the two clamping arc plates 51 are fixedly connected to splicing plates 52, and the inner threads of the two splicing plates 52 are threaded with locking bolts 53. The two extension rods 54 are fixedly connected to the outer walls of the clamping arc plates 51. A positioning magnetic block 55 is fixedly installed at one end of the rod 54. The positioning magnetic block 55 adopts a magnet structure with a square slot cut out on one side wall. The locking block 56 is a square metal block. The locking block 56 can be inserted horizontally into the inside of the positioning magnetic block 55 for adsorption and fixation. At the same time, both the upper and lower ends of the locking block 56 are restricted by the inner slot of the positioning magnetic block 55. Therefore, when the extension rod 54 rotates, the locking block 56 and the internal dial indicator 57 will be relatively stably fixed in the original position and will not deviate or move due to the inertia and centrifugal force generated by the rotation of the extension rod 54. The measuring position of the dial indicator 57 is directly stabilized. The locking block 56 is movably engaged on the inside of the positioning magnetic block 55. The dial indicator 57 is fixedly installed inside the locking block 56.

[0025] The other ends of the two extension rods 54 are fixedly equipped with rotating handles 7, which make it convenient for the operator to hold and drive the main shaft 3 to rotate. The lower ends of the two dial indicators 57 are slidably connected to the outer wall of the coupling 4. The dial indicator 57 belongs to the relatively mature existing technology at present. The dial indicator 57 reads the size of the measured dimension by amplifying the small linear movement of the measuring rod caused by the measured dimension through gear transmission. The dial indicator is a measuring instrument that uses rack and pinion or lever gear transmission to convert the linear displacement of the measuring rod into the angular displacement of the pointer.

[0026] Two crossbeams 61 are fixedly installed on the side walls of the two extension rods 54. The crossbeams 61 are welded laterally to the outer wall of the extension rods 54. Marking pens 62 that can be used to apply color markings are fixed to the ends of the two crossbeams 61. The ends of the marking pens 62 contact the side wall of the fixed coupling 4. Therefore, when the spindle 3 is manually controlled to rotate, the marking pens 62 can leave circular marks on the outside of the coupling 4 while rotating. Finally, the roundness of the circle drawn by the marking pens 62 can be used as a comparison for the measurement data of the dial indicator 57. For example, if the circle drawn by the marking pens 62 is relatively round, but the data measured by the dial indicator 57 indicates a difference in coaxiality, it can be determined that the reliability of the measurement result is insufficient. The ends of the two crossbeams 61 are fixedly connected to the marking pens 62, and the ends of the two marking pens 62 slide against the side wall of the coupling 4.

[0027] The coupling clamping and fixing structure 8 includes a support frame 81 and a double-ended screw 83. The support frame 81 is fixedly connected to one side of the top of the base 1. The double-ended screw 83 is rotatably connected to the inner side of the support frame 81. The threads on both sides of the double-ended screw 83 are arranged in opposite directions. Therefore, the operator can first place the coupling 4 inside the two clamping blocks 84, and drive the double-ended screw 83 to rotate inside the support frame 81 by rotating the turning wheel 82. The double-ended screw 83 will drive the two clamping blocks 84 to move relative to each other, so as to clamp the intermediate coupling 4 for fixing. The clamping blocks 84 are threadedly connected to both sides of the double-ended screw 83, and the turning wheel 82 is fixedly connected to the top of the double-ended screw 83. The inner walls of the two clamping blocks 84 abut against the outer wall of the coupling 4.

[0028] The engine main shaft positioning structure 9 includes an electric push rod 91 and a positioning block 93. The electric push rod 91 is fixedly connected to the inner wall of the side plate 2. The electric push rod 91 can be an electric push rod with a locking function. After the coupling 4 is clamped and fixed, the electric push rod 91 pushes the rotating seat 92 and the positioning block 93 close to the main shaft 3. The positioning block 93 is close to the end of the main shaft 3. In this way, when the main shaft 3 is controlled to rotate, the problem of end sagging can be reduced under the restriction of the positioning block 93. The front end of the electric push rod 91 is fixedly connected to the rotating seat 92. The positioning block 93 is rotatably installed on the inner side of the rotating seat 92. The other end of the positioning block 93 is movably connected to the end of the main shaft 3.

[0029] Working principle:

[0030] The coaxiality detection device for the engine main shaft is used because during the engine assembly process, it is often necessary to check the coaxiality of some components. For example, after the coupling is installed on the engine main shaft, it is necessary to check the coaxiality between the coupling and the engine main shaft.

[0031] The dial indicator fixed measuring structure of the engine spindle coaxiality testing device:

[0032] The clamping arc plate 51 is made of two semicircles on both sides with diameters matching the main shaft 3. The two clamping arc plates 51 can be clamped in the middle position on the outside of the main shaft 3. Then the splicing plates 52 on both sides will fit together and be fixed by rotating and tightening the locking bolts 53. Therefore, the clamping arc plate 51 can be fixed on the outside of the main shaft 3 along with the extension rods 54 on both sides. The positioning magnetic block 55 adopts a magnetic structure with a square slot cut on one side wall. The locking block 56 is a square metal block. The locking block 56 can be inserted horizontally into the inside of the positioning magnetic block 55 for adsorption and fixation. At the same time, the upper and lower ends of the locking block 56 are restricted by the inner slot of the positioning magnetic block 55. Therefore, when the extension rod 54 rotates, the locking block 56 and the internal dial indicator 57 will be fixed in the original position relatively stably. It will not deviate or move due to the inertia and centrifugal force generated by the rotation of the extension rod 54, and directly stabilize the measuring position of the dial indicator 57.

[0033] Reliability auxiliary structure for the coaxiality detection device of the engine main shaft:

[0034] The crossbeam 61 is welded laterally to the outer wall of the extension rod 54. Marking pens 62, which can be used to apply color marks, are fixed at the ends of the two crossbeams 61. The ends of the marking pens 62 contact the side wall of the fixed coupling 4. Therefore, when the main shaft 3 is manually controlled to rotate, the marking pen 62 can leave a circular mark on the outside of the coupling 4 while rotating. Finally, the roundness of the circle drawn by the marking pen 62 can be used as a comparison with the measurement data of the dial indicator 57. For example, if the circle drawn by the marking pen 62 is relatively round, but the data measured by the dial indicator 57 indicates that there is a difference in coaxiality, it can be determined that the reliability of the measurement result is insufficient.

[0035] The threads on both sides of the double-ended screw 83 are arranged in opposite directions. Therefore, the operator can first place the coupling 4 inside the two clamping blocks 84, and drive the double-ended screw 83 to rotate inside the support frame 81 by rotating the turning wheel 82. The double-ended screw 83 will drive the two clamping blocks 84 to move relative to each other, so as to clamp the middle coupling 4 for fixation. A limit screw is threaded inside the turning wheel 82 at the top of the double-ended screw 83. When the double-ended screw 83 drives the clamping blocks 84 to clamp the coupling 4, the limit screw can be screwed into the support frame 81 for fixation. This can further limit the double-ended screw 83 and prevent the double-ended screw 83 from becoming loose.

[0036] Furthermore, the electric push rod 91 can be selected as an electric push rod with locking function. After the coupling 4 is clamped and fixed, the electric push rod 91 can push the rotating seat 92 and the positioning block 93 close to the main shaft 3. The positioning block 93 is close to the end of the main shaft 3. In this way, when the main shaft 3 is controlled to rotate, the problem of end drop can be reduced under the restriction of the positioning block 93.

[0037] Specific procedures for coaxiality testing of the engine spindle:

[0038] When performing coaxiality testing on the engine main shaft, the operator first uses two opposing clamping blocks 84 on the inner side of the support frame 81 to fix the coupling 4, so that the coupling 4 will not affect the measurement. Then, the other end uses an electric push rod 91 to push the rotatable positioning block 93 to the end of the main shaft 3, using the positioning block 93 to stabilize the rotational position of the main shaft 3. Next, the operator places two clamping arc plates 51 in the middle position on the outside of the main shaft 3, and then the two side splicing plates 52 will fit together. The fixing is completed by rotating and tightening the locking bolts 53. Therefore, the clamping arc plates 51, together with the two side extension rods 54, can be fixed to the outside of the main shaft 3. Then, the locking block 56 can be inserted laterally into the inner side of the positioning magnetic block 55 for adsorption and fixation. At the same time, both the upper and lower ends of the locking block 56 are restricted by the inner groove of the positioning magnetic block 55. Therefore, when the extension rod 54 rotates, the locking block 56 and the internal dial indicator 57 will be relatively stably fixed in the original position. According to the rotation of the engine main shaft 3 and the non-rotation of the coupling 4, the pointer jump of the dial indicator 57 can be observed to see if it is within the standard range. The test is completed, and the test device can be fixed on the engine main shaft 3 to truly simulate the situation where the engine main shaft 3 rotates relative to the coupling 4, thereby detecting the coaxiality between the coupling 4 and the engine main shaft 3 under dynamic conditions.

[0039] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A coaxiality detection device for an engine main shaft, comprising a base (1), a side plate (2), and a main shaft (3), wherein a coupling (4) is rotatably connected to one end of the main shaft (3), and the side plate (2) is fixedly connected to one side of the top end of the base (1), characterized in that: The main shaft (3) is provided with a main shaft coaxiality measuring structure (5) on the outside, and a coupling clamping and fixing structure (8) is provided on the other side above the base (1). The side plate (2) is provided with an engine main shaft positioning structure (9).

2. The coaxiality detection device for the engine main shaft according to claim 1, characterized in that: The main spindle coaxiality measuring structure (5) includes a clamping arc plate (51) and an extension rod (54). The two clamping arc plates (51) are movably sleeved on the outside of the main spindle (3). The side walls of the two clamping arc plates (51) are fixedly connected with splicing plates (52). The inner sides of the two splicing plates (52) are threaded with locking bolts (53). The two extension rods (54) are fixedly connected to the outer walls of the clamping arc plates (51). One end of the two extension rods (54) is fixedly installed with a positioning magnetic block (55). The inner side of the positioning magnetic block (55) is movably engaged with a locking block (56). The inside of the locking block (56) is fixedly installed with a dial indicator (57).

3. The coaxiality detection device for the engine main shaft according to claim 2, characterized in that: The other ends of the two extension rods (54) are fixedly fitted with rotating handles (7), and the lower ends of the two dial indicators (57) are slidably connected to the outer wall of the coupling (4).

4. The coaxiality detection device for the engine main shaft according to claim 2, characterized in that: Two crossbeams (61) are fixedly installed on the side walls of the two extension rods (54), and marker pens (62) are fixedly connected to the ends of the two crossbeams (61). The ends of the two marker pens (62) slide against the side wall of the coupling (4).

5. The coaxiality detection device for the engine main shaft according to claim 1, characterized in that: The coupling clamping and fixing structure (8) includes a support frame (81) and a double-ended screw (83). The support frame (81) is fixedly connected to one side of the top of the base (1). The double-ended screw (83) is rotatably connected to the inner side of the support frame (81). Clamping blocks (84) are threadedly connected to both sides of the double-ended screw (83). A turning wheel (82) is fixedly connected to the top of the double-ended screw (83). The inner walls of the two clamping blocks (84) abut against the outer wall of the coupling (4).

6. The coaxiality detection device for the engine main shaft according to claim 1, characterized in that: The engine main shaft positioning structure (9) includes an electric push rod (91) and a positioning block (93). The electric push rod (91) is fixedly connected to the inner wall of the side plate (2). The front end of the electric push rod (91) is fixedly connected to a rotating seat (92). The positioning block (93) is rotatably installed on the inner side of the rotating seat (92). The other end of the positioning block (93) is movably connected to the end of the main shaft (3).

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