Straight shaft clamp and use method of straight shaft clamp

Abstract

The invention relates to the technical field of shaft detection, and discloses a straight shaft clamp and a straight shaft clamp using method, and the straight shaft clamp comprises a rack, a driving mechanism and two fixing mechanisms; the top surface of the rack is a working surface, the working surface is provided with a first sliding rail and a second sliding rail which extend horizontally and are distributed at intervals, and a plurality of sliding blocks used for installing detection instruments are installed on the first sliding rail in a sliding mode; the two fixing mechanisms are installed on the second sliding rail, the distance between the two fixing mechanisms in the length direction of the second sliding rail is adjustable, and the two fixing mechanisms are configured to be rotatably connected with the two ends of the to-be-tested straight shaft respectively; the driving mechanism is adjustable in height and is used for driving the to-be-measured straight shaft to rotate circumferentially. The straight shaft clamp can adapt to straight shafts of different sizes, and can realize rapid detection of the to-be-detected straight shaft by installing the detection instrument on the first sliding rail in a sliding manner.

Description

Technical Field

[0001] The present invention relates to the technical field of shaft detection, and particularly relates to a straight shaft fixture and a method for using the straight shaft fixture. Background Art

[0002] In a cigarette production workshop, in order to achieve stable and efficient transportation of tobacco leaves and cut tobacco, a large number of belt conveyors are arranged between various process equipment to transport tobacco leaves and cut tobacco.

[0003] The driving execution component of the belt conveyor can be regarded as a straight shaft. As the core power transmission component of the belt conveyor, its rotation accuracy directly affects the stability of equipment operation, energy consumption efficiency and service life. For example, when the straight shaft of the belt conveyor rotates, its radial offset will have periodic fluctuations, and excessive circular runout will cause the tobacco materials transported on the conveyor belt to deviate or even spill onto the bottom surface, and seriously, it will cause wear of the conveyor belt and reduce the service life. Therefore, it is necessary to regularly remove the straight shaft and detect parameters such as the dimensional accuracy, surface quality and geometric tolerance of the straight shaft.

[0004] However, since there are various models of belt conveyors in the cigarette production workshop, that is, there are a large number of straight shafts with different diameters and lengths. In order to speed up the detection speed of the straight shaft and at the same time reduce the detection difficulty, it is very necessary to propose a straight shaft fixture that can adapt to different-sized straight shafts and can assist the detection instrument to achieve rapid detection. Summary of the Invention

[0005] The purpose of the present invention is to provide a straight shaft fixture that can adapt to different-sized straight shafts and can assist the detection instrument to achieve rapid detection.

[0006] To achieve the above purpose, the present invention provides a straight shaft fixture, which includes a frame, a driving mechanism and two fixing mechanisms; the top surface of the frame is a working surface, and the working surface is provided with a first sliding track and a second sliding track that extend horizontally and are spaced apart. A plurality of sliders for installing detection instruments are slidably installed on the first sliding track; the two fixing mechanisms are installed on the second sliding track, and the distance between the two fixing mechanisms in the length direction of the second sliding track is adjustable. The two fixing mechanisms are configured to be able to rotatably connect to the two ends of the straight shaft to be measured respectively; the driving mechanism is adjustable in height and is used to drive the straight shaft to be measured to rotate circumferentially.

[0007] In some embodiments, the fixing mechanism includes a placement block slidably connected to the second sliding track, and the top of the placement block is provided with a V-shaped placement groove that penetrates the placement block in the length direction of the second sliding track. The V-shaped placement groove is used to rotatably connect to the end of the straight shaft to be measured.

[0008] In some embodiments, the fixing mechanism further includes a reinforcement structure, a bearing seat, and two bearings. The two bearings are respectively sleeved on two ends of the straight shaft to be measured, and the bearing seat can be fixedly sleeved on the bearings. The reinforcement structure includes two first connection parts and two second connection parts. The two first connection parts are arranged on both sides in the length direction of the placing block, the top surface of the first connection part is a horizontal plane, the two second connection parts are spaced apart and arranged on the outer periphery of the bearing seat, the bottom surface of the second connection part is a horizontal plane, and the two second connection parts can be fixedly connected to the two first connection parts through bolts one by one, wherein the top surface of the first connection part contacts the bottom surface of the second connection part.

[0009] In some embodiments, the first connection part is provided with a vertically penetrating strip-shaped hole, the length direction of the strip-shaped hole is parallel to the length direction of the placing block, and the two bolts are respectively installed in the two strip-shaped holes one by one.

[0010] In some embodiments, the driving mechanism includes a driving motor, a motor mounting frame, and a lifting mechanism. The lifting mechanism is mounted on the motor mounting frame, the driving motor is mounted on the top of the lifting mechanism and above the top plate of the motor mounting frame, and the lifting mechanism can adjust the height of the driving motor so that the output shaft of the driving motor can be in transmission connection with the end of the straight shaft to be measured.

[0011] In some embodiments, the lifting mechanism includes a mounting plate, a lifting lead screw, and a plurality of guide rods. The mounting plate is arranged above the top plate, the driving motor is mounted on the top surface of the mounting plate, the lifting lead screw and all the guide rods pass through the top plate and are connected to the mounting plate, the guide rods are slidably connected to the top plate, the lifting lead screw is equipped with a lead screw nut threadedly connected thereto, and the lead screw nut is rotatably connected to the top plate.

[0012] In some embodiments, a coupling for connecting with the end of the straight shaft to be measured is mounted on the output shaft of the driving motor.

[0013] In some embodiments, the straight shaft clamp further includes two temporary support blocks. The top of the temporary support block is provided with a V-shaped groove penetrating the temporary support block along the length direction of the second sliding track. The bottom of the temporary support block is provided with an avoidance groove for the second sliding track to pass through. The bottom of the temporary support block is provided with two clamping blocks, and the two clamping blocks are respectively located on both sides in the width direction of the second sliding track. The top of the frame is provided with two downwardly concave clamping grooves, and the two clamping grooves correspond to the two clamping blocks one by one. The temporary support block has a support state and a storage state. When the temporary support block is in the support state, the top surface of the clamping block presses against the top surface of the frame, and the top of the temporary support block is higher than the top of the placing block. When the temporary support block is in the storage state, the clamping block is movably inserted into the clamping groove, and the top of the temporary support block is lower than the top of the placing block.

[0014] In some embodiments, the slider slidably mounted on the first sliding track is connected to the detection instrument through a magnetic attraction structure.

[0015] On the other hand, the present invention provides a method for using a straight shaft fixture, which includes the following steps: S1. Place the straight shaft to be measured, adjust the positions of the two fixing mechanisms on the second sliding track so that the two fixing mechanisms respectively correspond to one end of the straight shaft to be measured, and place the straight shaft to be measured on the two fixing mechanisms; S2. Adjust the straight shaft to be measured to be horizontal. With the assistance of a horizontal detection instrument, finely adjust the placement position and fixing strength of the straight shaft to be measured to keep the straight shaft horizontal; S3. Conduct a manual rotation detection item. Install the detection instrument used on the first sliding track, adjust the instrument test position, conduct detection and record parameters; S4. Connect the straight shaft to be measured to the driving mechanism, and adjust the height of the driving mechanism to keep the straight shaft to be measured horizontal; S5. Conduct an electric rotation detection item. Install the detection instrument used on the first sliding track, adjust the instrument test position, conduct detection and record parameters.

[0016] The above technical solution of the present invention has the following beneficial effects:

[0017] Before detection, the tester installs the detection instrument on the first sliding track through a slider and adjusts the distance between the two fixing mechanisms according to the length of the straight shaft to be measured; then installs the straight shaft to be measured on the fixing mechanisms, makes the two fixing mechanisms respectively rotatably connected to both ends of the straight shaft to be measured, and finally adjusts the installation position of the straight shaft to be measured so that the straight shaft to be measured is horizontally placed. Then start various detections that need to be carried out under the condition of manual rotation of the straight shaft to be measured, and the detection instrument can slide on the first sliding track parallel to the axis of the straight shaft to be measured, so that data parameters of different positions of the straight shaft to be measured can be detected. For example, for the detection of circular runout error, contact the circular runout error detector on the first sliding track with the detection surface of the straight shaft to be measured, then manually rotate the straight shaft to be measured and record the detection value after it rotates one week to obtain the circular runout error of the corresponding detection point. After the items that need to be manually rotated for detection are completed, adjust the height of the driving mechanism to connect it to the straight shaft to be measured, and keep the straight shaft to be measured in a horizontal state after their connection, and then detect other parameters of the straight shaft to be measured under the drive of the driving mechanism. Therefore, the straight shaft fixture of the present invention can adapt to straight shafts of different sizes and can realize the rapid detection of the straight shaft to be measured by slidingly installing the detection instrument on the first sliding track. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a straight shaft fixture according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a driving mechanism according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the installation of a straight shaft to be measured and a placement block according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a placement block according to an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of a temporary support block according to an embodiment of the present invention.

[0023] Description of reference numerals

[0024] 1. Frame; 11. Working surface;

[0025] 2. Fixing mechanism; 21. Placement block; 22. V-shaped placement groove; 23. Reinforcement structure; 24. Bearing seat; 25. First connecting portion; 251. Strip-shaped hole; 26. Second connecting portion;

[0026] 3. Straight shaft to be measured;

[0027] 4. Detection instrument;

[0028] 5. Driving mechanism; 51. Driving motor; 52. Motor mounting bracket; 53. Lifting mechanism; 54. Top plate; 55. Mounting plate; 56. Lifting lead screw; 57. Guide rod; 58. Lifting nut; 59. Linear bearing;

[0029] 6. Coupling;

[0030] 7. Temporary support block; 71. Avoidance groove; 72. Card slot; 73. Card block; 74. V-shaped groove;

[0031] 8. First sliding track; 81. Slide block;

[0032] 9. Second sliding track. Detailed implementation manners

[0033] The following provides a detailed description of the specific implementation manners of the present invention. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0034] In the present invention, unless otherwise specified, the orientation terms such as "upper" and "lower" generally refer to the orientation in the assembled and used state. "Inner" and "outer" refer to the inside and outside relative to the contour of each component itself.

[0035] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] As Figure 1 shown, the present invention provides a straight shaft fixture, which includes a frame 1, a driving mechanism 5 and two fixing mechanisms 2; the top surface of the frame 1 is a working surface 11, and the working surface 11 is provided with a first sliding track 8 and a second sliding track 9 that extend horizontally and are spaced apart; a plurality of sliders 81 for installing a detection instrument 4 are slidably installed on the first sliding track 8; the two fixing mechanisms 2 are installed on the second sliding track 9, and the distance between the two fixing mechanisms 2 in the length direction of the second sliding track 9 is adjustable, and the two fixing mechanisms 2 are configured to be able to be rotatably connected to both ends of the straight shaft 3 to be measured respectively; the driving mechanism 5 is adjustable in height and is used to drive the straight shaft 3 to be measured to rotate circumferentially.

[0037] Specifically, before the detection, the tester installs the detection instrument 4 on the first sliding track 8 through the slider 81 and adjusts the distance between the two fixing mechanisms 2 according to the length of the straight shaft 3 to be measured; then installs the straight shaft 3 to be measured on the fixing mechanism 2, so that the two fixing mechanisms 2 are respectively rotatably connected to both ends of the straight shaft 3 to be measured, and finally adjusts the installation position of the straight shaft 3 to be measured so that the straight shaft 3 to be measured is horizontally placed. Then start various detections that need to be carried out under the condition of manual rotation on the straight shaft 3 to be measured, and the detection instrument 4 can slide on the first sliding track 8 parallel to the axis of the straight shaft 3 to be measured, so as to detect the data parameters at different positions of the straight shaft 3 to be measured. For example, for the detection of circular runout error, the circular runout error detector on the first sliding track 8 is brought into contact with the detection surface of the straight shaft 3 to be measured, and then the straight shaft 3 to be measured is manually rotated and the detection value is recorded after it rotates one week to obtain the circular runout error of the corresponding detection point. After the items that need to be manually rotated for detection are completed, adjust the height of the driving mechanism 5 so that it is connected to the straight shaft 3 to be measured, and keep the straight shaft 3 to be measured in a horizontal state after their connection, and then detect other parameters of the straight shaft 3 to be measured under the drive of the driving mechanism 5. Therefore, the straight shaft fixture of the present invention can be adapted to straight shafts of different sizes, and can realize the rapid detection of the straight shaft 3 to be measured by slidingly installing the detection instrument 4 on the first sliding track 8.

[0038] It should be noted that since the second sliding track 9 is horizontally arranged, the connection line between the same parts of the two fixing mechanisms 2 provided thereon is also parallel to the horizontal line. Therefore, during adjustment, only the connection position between the straight shaft 3 to be measured and the fixing mechanism 2 needs to be finely adjusted to make the straight shaft 3 to be measured horizontal, and then the height of the driving mechanism 5 is adjusted to match the position of the straight shaft 3 to be measured.

[0039] As Figure 3 and Figure 4 shown, in some embodiments of the present invention, the fixing mechanism 2 includes a placement block 21 slidably connected to the second sliding track 9. A V-shaped placement groove 22 penetrating the placement block 21 along the length direction of the second sliding track 9 is provided on the top of the placement block 21. The V-shaped placement groove 22 is used for rotatably connecting with the end of the straight shaft 3 to be measured.

[0040] Specifically, when placing the straight shaft 3 to be measured, the two ends of the straight shaft 3 to be measured are respectively placed in the V-shaped placement grooves 22 of the two placement blocks 21. Within a certain range, the V-shaped placement groove 22 is applicable to straight shafts 3 to be measured with different diameters. The V-shaped placement groove 22 contacts the outer surface of the straight shaft 3 through the symmetric inclined surfaces on both sides. No matter how the shaft diameter of the straight shaft 3 to be measured changes, it can automatically adjust the center line of the shaft to the theoretical symmetry line of the V-shaped placement groove 22 to facilitate adjusting the straight shaft 3 to be measured to be horizontal during detection. And the straight shaft 3 forms two-point contact with the two inclined surfaces on both sides of the V-shaped placement groove 22, reducing the risk of deviation caused by single-point support, thereby ensuring the detection accuracy.

[0041] It should be noted that the angle and depth of the V-shaped placement groove 22 can be customized according to requirements to adapt to the shaft diameters of different straight shafts.

[0042] In some embodiments of the present invention, the fixing mechanism 2 further includes a reinforcement structure 23, a bearing seat 24 and two bearings. The two bearings are respectively sleeved on the two ends of the straight shaft 3 to be measured. The bearing seat 24 can be fixedly sleeved on the bearing. The reinforcement structure 23 includes two first connection parts 25 and two second connection parts 26; the two first connection parts 25 are arranged on both sides in the length direction of the placement block 21, the top surface of the first connection part 25 is a horizontal plane, the two second connection parts 26 are arranged at intervals on the outer periphery of the bearing seat 24, the bottom surface of the second connection part 26 is a horizontal plane, and the two second connection parts 26 can be fixedly connected to the two first connection parts 25 through bolts one by one, wherein the top surface of the first connection part 25 contacts the bottom surface of the second connection part 26.

[0043] Specifically, on the working surface 11, the projection of the length direction of the placing block 21 is perpendicular to the length direction of the second sliding track 9. Bearings for connecting with the bearing block 24 are respectively connected to the two end parts of the straight shaft 3 to be measured. After the straight shaft 3 to be measured is installed on the bearing block 24, the tester can use bolts to connect the first connecting part 25 of the placing block 21 and the second connecting part 26 of the bearing block 24, so as to place the straight shaft 3 to be measured on the straight shaft fixture. Then, the horizontal detection instrument 4 is used to adjust the straight shaft by slightly adjusting the tightness of the bolts, so as to realize the horizontal placement of the straight shaft 3 to be measured. For example, if the horizontal detection instrument 4 shows that one end of the straight shaft 3 to be measured is slightly higher, the tester can appropriately tighten the bolt corresponding to this end to reduce the height of this end. Moreover, the fixing mechanism 2 can limit the axial movement when the straight shaft 3 to be measured rotates, thereby reducing the detection error.

[0044] In addition, in this embodiment, the structure of the V-shaped placing groove 22 of the placing block 21 is adopted, and on this basis, a first connecting part 25 is added to the placing block 21, so that the straight shaft 3 to be measured has two placing methods and the cost is saved.

[0045] In some embodiments of the present invention, the first connecting part 25 is provided with a vertically penetrating strip-shaped hole 251. The length direction of the strip-shaped hole 251 is parallel to the length direction of the placing block 21. Two bolts are respectively installed in the two strip-shaped holes 251 one by one, so that when the bearing block 24 is connected to the placing block 21, there is an adjustment margin perpendicular to the length direction of the first sliding track 8.

[0046] As Figure 2 shown, in some embodiments of the present invention, the driving mechanism 5 includes a driving motor 51, a motor mounting frame 52 and a lifting mechanism 53. The lifting mechanism 53 is installed on the motor mounting frame 52. The driving motor 51 is installed on the top of the lifting mechanism 53 and above the top plate 54 of the motor mounting frame 52. The lifting mechanism 53 can adjust the height of the driving motor 51 so that the output shaft of the driving motor 51 can be in transmission connection with the end part of the straight shaft 3 to be measured. In some embodiments, the motor mounting frame 52 can be fixedly connected to the frame 1 or can be independent of the frame 1.

[0047] In some embodiments of the present invention, the lifting mechanism 53 includes a mounting plate 55, a lifting lead screw 56 and a plurality of guide rods 57. The mounting plate 55 is arranged above the top plate 54. The driving motor 51 is installed on the top surface of the mounting plate 55. The lifting lead screw 56 and all the guide rods 57 pass through the top plate 54 and are connected to the mounting plate 55. The guide rods 57 are slidably connected to the top plate 54. The lifting lead screw 56 is equipped with a lead screw nut threadedly connected thereto, and the lead screw nut is rotatably connected to the top plate 54.

[0048] Specifically, the lifting screw rod 56 can be axially lifted to adjust the height position of the driving motor 51, so that the driving motor 51 can be connected to the straight shaft 3 to be measured in a horizontal state. A plurality of guide rods 57 arranged in parallel and at intervals with the lifting screw rod 56 can increase the stability during the height adjustment of the driving motor 51.

[0049] In some embodiments, the screw nut can be a screw-fixed nut. The lifting screw rod 56 is threadedly connected to the top plate 54 through the screw-fixed nut. When adjusting the position of the driving motor 51, the tester can manually rotate the screw-fixed nut to realize the lifting of the lifting screw rod 56. Of course, those skilled in the art can select a screw nut that can be rotatably connected to the top plate 54 according to needs.

[0050] In some embodiments of the present invention, a coupling 6 for connecting to the end of the straight shaft 3 to be measured is installed on the output shaft of the driving motor 51. Specifically, the coupling 6 is used to realize the transmission connection between the driving motor 51 and the straight shaft 3 to be measured, which simplifies the installation process of the driving motor 51 and the straight shaft 3 to be measured, improves the centering accuracy, and has the advantages of convenient disassembly and replacement, and is more suitable for the detection of straight shafts of various sizes.

[0051] As Figure 5 shown, in some embodiments of the present invention, the straight shaft fixture further includes two temporary support blocks 7. A V-shaped groove 74 penetrating the temporary support block 7 along the length direction of the second sliding track 9 is provided at the top of the temporary support block 7; an avoidance groove 71 is provided at the bottom of the temporary support block 7 for the second sliding track 9 to pass through. Two clamping blocks 73 are provided at the bottom of the temporary support block 7, and the two clamping blocks 73 are respectively located on both sides in the width direction of the second sliding track 9. Two downwardly concave clamping grooves 72 are provided at the top of the frame 1, and the two clamping grooves 72 correspond to the two clamping blocks 73 one by one; the temporary support block 7 has a support state and a storage state. When the temporary support block 7 is in the support state, the top surface of the clamping block 73 abuts against the top surface of the frame 1, and the top of the temporary support block 7 is higher than the top of the placement block 21; when the temporary support block 7 is in the storage state, the clamping block 73 is movably inserted into the clamping groove 72, and the top of the temporary support block 7 is lower than the top of the placement block 21.

[0052] Specifically, the temporary support block 7 is erected above the second sliding track 9, and the second sliding track 9 passes out from its avoidance groove 71. Before installing the straight shaft 3 to be measured on the placement block 21, the tester can adjust the temporary support block 7 to the support state so that its top is higher than the top of the placement block 21, and then temporarily place the straight shaft 3 to be measured in the V-shaped groove 74 of the temporary support block 7, so that the straight shaft 3 to be measured is located above the placement block 21. After the straight shaft 3 to be measured and the bearing seat 24 are installed, the tester can lift the straight shaft 3 to be measured, move the temporary support block 7 to make it enter the retracted state, and then place the straight shaft 3 to be measured on the top of the placement block 21.

[0053] In some embodiments of the present invention, in order to achieve the rapid installation and replacement of the detection instrument 4, the slider 81 slidably mounted on the first sliding track 8 is connected to the detection instrument 4 through a magnetic attraction structure.

[0054] On the other hand, the present invention provides a method for using a straight shaft fixture, which includes the following steps: S1. Place the straight shaft 3 to be measured, adjust the positions of the two fixing mechanisms 2 on the second sliding track 9 so that the two fixing mechanisms 2 respectively correspond to one end of the straight shaft 3 to be measured, and place the straight shaft 3 to be measured on the two fixing mechanisms 2; S2. Adjust the straight shaft 3 to be horizontal. With the assistance of the horizontal detection instrument 4, finely adjust the placement position and fixing strength of the straight shaft 3 to be measured so that the straight shaft 3 to be measured remains horizontal; S3. Conduct a manual rotation detection item, install the used detection instrument 4 on the first sliding track 8, and adjust the instrument test position to conduct detection and record parameters; S4. Connect the straight shaft 3 to be measured to the driving mechanism 5 and adjust the height of the driving mechanism 5 to keep the straight shaft 3 to be measured horizontal; S5. Conduct an electric rotation detection item, install the used detection instrument 4 on the first sliding track 8, and adjust the instrument test position to conduct detection and record parameters.

[0055] Specifically, in steps S3 and S5, the tester can adjust the detection position of the detection instrument 4 through the first sliding track 8, so as to obtain the detection parameters of different positions of the straight shaft 3 to be measured.

[0056] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0057] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0058] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A straight shaft fixture, characterized in that, It comprises a frame (1), a driving mechanism (5) and two fixing mechanisms (2); The top surface of the frame (1) is a working surface (11), and the working surface (11) is provided with a first sliding rail (8) and a second sliding rail (9) extending horizontally and spaced apart, and a plurality of sliding blocks (81) for mounting a detection instrument (4) are slidably mounted on the first sliding rail (8); The two fixing mechanisms (2) are installed on the second sliding track (9), the spacing between the two fixing mechanisms (2) in the length direction of the second sliding track (9) is adjustable, and the two fixing mechanisms (2) are configured to be rotatably connected to the two ends of the straight shaft (3) to be measured respectively; The driving mechanism (5) is height-adjustable and is used to drive the direct shaft (3) to be measured to rotate circumferentially.

2. The straight shaft fixture according to claim 1, characterized in that The fixing mechanism (2) comprises a placement block (21) slidably connected to the second sliding track (9); a V-shaped placement groove (22) is provided on the top of the placement block (21) and passes through the placement block (21) along the length direction of the second sliding track (9); the V-shaped placement groove (22) is used for rotationally connecting with the end of the straight shaft (3) to be measured.

3. The straight shaft fixture according to claim 2, characterized in that, The fixing mechanism (2) further comprises a reinforcement structure (23), a bearing seat (24) and two bearings, wherein the two bearings are respectively sleeved on two ends of the straight shaft (3) to be measured, the bearing seat (24) can be fixedly sleeved on the bearings, and the reinforcement structure (23) comprises two first connecting parts (25) and two second connecting parts (26); The two first connecting parts (25) are arranged on both sides of the length direction of the placement block (21), and the top surface of the first connecting part (25) is a horizontal plane. The two second connecting parts (26) are respectively arranged on both sides of the bearing seat (24), and the bottom surface of the second connecting part (26) is a horizontal plane. The two second connecting parts (26) can be fixed to the two first connecting parts (25) by bolts in a one-to-one correspondence, wherein the top surface of the first connecting part (25) is in contact with the bottom surface of the second connecting part (26).

4. The straight-axis fixture according to claim 3, wherein The first connecting portion (25) is provided with a vertically penetrating strip hole (251), the length direction of the strip hole (251) is parallel to the length direction of the placement block (21), and the two bolts are respectively installed in the two strip holes (251) in a one-to-one correspondence.

5. The straight-axis fixture according to claim 1, characterized in that, The driving mechanism (5) comprises a driving motor (51), a motor mounting frame (52) and a lifting mechanism (53); the lifting mechanism (53) is mounted on the motor mounting frame (52); the driving motor (51) is mounted on the top of the lifting mechanism (53) and is located above a top plate (54) of the motor mounting frame (52); the lifting mechanism (53) is capable of adjusting the height of the driving motor (51) so that the output shaft of the driving motor (51) can be transmission-connected with the end of the straight shaft (3) to be measured.

6. The straight shaft fixture according to claim 5, wherein, The lifting mechanism (53) includes a mounting plate (55), a lifting lead screw (56), and a plurality of guide rods (57). The mounting plate (55) is disposed above the top plate (54). The drive motor (51) is mounted on the top surface of the mounting plate (55). The lifting lead screw (56) and all the guide rods (57) pass through the top plate (54) and are connected to the mounting plate (55). The guide rods (57) are slidably connected to the top plate (54). The lifting lead screw (56) is provided with a lead screw nut threadedly connected thereto, and the lead screw nut is rotatably connected to the top plate (54).

7. The straight-axis fixture according to claim 6, characterized in that, A coupling (6) for connecting to the end of the straight shaft (3) to be measured is mounted on the output shaft of the drive motor (51).

8. The straight-axis fixture according to claim 3, wherein, The straight shaft fixture further includes two temporary support blocks (7). The top of the temporary support block (7) is provided with a V-shaped groove (74) penetrating the temporary support block (7) along the length direction of the second sliding track (9). The bottom of the temporary support block (7) is provided with an avoidance groove (71) for the second sliding track (9) to pass through. The bottom of the temporary support block (7) is provided with two clamping blocks (73). The two clamping blocks (73) are respectively located on both sides in the width direction of the second sliding track (9). The top of the frame (1) is provided with two downwardly recessed clamping grooves (72). The two clamping grooves (72) correspond to the two clamping blocks (73) one by one. The temporary support block (7) has a support state and a storage state. When the temporary support block (7) is in the support state, the top surface of the clamping block (73) abuts against the top surface of the frame (1), and the top of the temporary support block (7) is higher than the top of the placing block (21). When the temporary support block (7) is in the storage state, the clamping block (73) is movably inserted into the clamping groove (72), and the top of the temporary support block (7) is lower than the top of the placing block (21).

9. The straight-axis fixture according to claim 1, characterized in that The slider (81) slidably mounted on the first sliding track (8) is connected to the detection instrument (4) through a magnetic attraction structure.

10. A method for using a straight shaft fixture, characterized in that, It includes the following steps: S1. Place the straight shaft (3) to be measured, adjust the positions of the two fixing mechanisms (2) on the second sliding track (9) so that the two fixing mechanisms (2) respectively correspond to one end of the straight shaft (3) to be measured, and place the straight shaft (3) to be measured on the two fixing mechanisms (2). S2. Adjust the straight shaft (3) to be horizontal. With the assistance of the horizontal detection instrument (4), finely adjust the placement position and fixing strength of the straight shaft (3) to be measured so that the straight shaft (3) to be measured remains horizontal. S3. Conduct manual rotation detection items. Install the used detection instrument (4) on the first sliding track (8), adjust the instrument test position, conduct detection and record parameters. S4. Connect the straight shaft (3) to be measured to the driving mechanism (5), and adjust the height of the driving mechanism (5) to keep the straight shaft (3) to be measured horizontal. S5. Conduct the electric rotation detection project, install the used detection instrument (4) on the first sliding track (8), adjust the instrument test position, conduct the detection and record the parameters.

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