A centering fixture for a medium-long axis structural member

Abstract

The utility model provides a kind of medium-long axis structural member centering fixture, the utility model includes distance adjusting assembly, can be flexible to the diameter of medium-long axis casting piece Two centering assembly spacing is adjusted, adapt to different specifications centering demand, the C-shaped floating dog claw of centering assembly can be stable support shaft piece two end offset, V-shaped clamping surface can be stable and fixed position and prevent deflection, adapt to the irregular shape of shaft piece surface, increase contact stability and centering accuracy, effectively solve the problem of overhanging end skew, guarantee that the two end thread holes, end surface and part center are coaxial after processing And end surface is perpendicular, fixture is driven by motor, realize automatic adjustment and centering, easy to operate, both reduce manual labor intensity, improve centering efficiency and stability, conducive to guarantee product processing quality consistency.

Description

Technical Field

[0001] This utility model relates to the field of centering fixture technology, and in particular to a centering fixture for a medium-length shaft structure. Background Technology

[0002] In machining the end faces of long shaft castings, the general-purpose three-jaw chuck fixture has obvious defects. It can only locally center a single clamping area of ​​the shaft. Because the shaft is long, the overhanging end is prone to skew, resulting in poor coaxiality between the threaded holes and end faces and the rotation center after machining, which affects subsequent assembly. At the same time, the rigid clamping surface is difficult to fit the irregular surface of the casting, resulting in poor contact stability. In addition, it relies on manual adjustment, which is cumbersome and causes large fluctuations in machining quality, restricting accuracy and efficiency, and has become a bottleneck that urgently needs to be overcome in this field.

[0003] Therefore, designing and manufacturing a new type of fixture that can simultaneously bring both ends of the medium-length shaft casting close to the common center of rotation and solve the aforementioned machining problem has become an urgent problem for those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a centering fixture for medium-length shaft structural components. This invention features an adjustable spacing component, allowing for flexible adjustment of the distance between the two centering components according to the diameter of the medium-length shaft casting, adapting to different centering requirements. The C-shaped floating jaws of the centering components provide stable support against offset at both ends of the shaft, while the V-shaped locking surface ensures stable positioning and prevents deflection. It adapts to irregular shapes on the shaft surface, increasing contact stability and centering accuracy, effectively solving the problem of skewed overhang ends, and ensuring that the threaded holes and end faces at both ends are coaxial with the center of the part and perpendicular to the end faces after machining. The fixture is driven by a motor, achieving automated adjustment and centering. Operation is simple, reducing manual labor intensity and improving centering efficiency and stability, thus ensuring consistent product processing quality.

[0005] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0006] A centering fixture for a medium-length shaft structure is provided, including a motor A. A rotating disk is mounted on the output shaft of the motor A. Two rectangular through holes are symmetrically opened on one end face of the rotating disk. An adjusting component is movably installed between the two rectangular through holes. The adjusting component is set inside the rotating disk. Centering components are symmetrically installed on the adjusting component corresponding to the two rectangular through holes.

[0007] Specifically, the centering component includes two jaw positioning blocks, which are respectively installed on the adjusting component in a one-to-one correspondence with two rectangular through holes. Each jaw positioning block has a through groove at one end, and a drive shaft is movably mounted on each jaw positioning block via a bearing. The drive shaft passes through the through groove and through the jaw positioning block.

[0008] Preferably, a floating pawl is fixedly installed on each drive shaft at a position inside the through groove. The floating pawl has a C-shaped structure, and both ends of the floating pawl have a V-shaped engagement surface structure. A medium-length shaft casting is abutted between the two floating pawls.

[0009] Each floating jaw is movably mounted to the through slot. An external gear ring is mounted on the outer side of one end of each drive shaft. Each external gear ring drives a gear. A motor B is mounted on one side of each jaw positioning block. The output shaft of each motor B is axially mounted to the gear.

[0010] The pitch adjustment assembly includes a motor C, which is mounted on the outside of the rotating disk. A bidirectional ball screw is axially mounted on the output shaft of the motor C. The bidirectional ball screw is movably mounted inside the rotating disk via bearings. Two screw nuts are driven on the bidirectional ball screw, and a corresponding chuck positioning block is mounted on each screw nut.

[0011] Two rectangular through holes are symmetrically positioned on one end face of the rotating disk relative to its center.

[0012] This invention, by setting an adjustable distance component, can flexibly adjust the distance between two centering components according to the diameter of the medium-length shaft casting. It has strong adaptability and can meet the centering requirements of medium-length shaft castings with different diameter specifications. The floating jaws in the centering component adopt a C-shaped structure to stably support the offset of the two ends of the shaft. The V-shaped clamping surface design can stably position and prevent the shaft from deflecting. It can adapt to the irregular shape of the surface of the medium-length shaft casting and increase the contact stability with the medium-length shaft casting, improve the centering accuracy, and effectively solve the problem of the skew of the overhanging end of the medium-length shaft casting. It ensures that the threaded holes and end faces at both ends are coaxial with the center of the whole part after processing, and the end faces are perpendicular. The entire fixture is driven by a motor, realizing automated adjustment and centering. It is easy to operate, reduces the intensity of manual labor, and also improves the centering efficiency and stability, which is conducive to ensuring the consistency of product processing quality. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the present invention.

[0014] Figure 1 This is a three-dimensional view of the overall structure of a centering fixture for a medium-long shaft structure according to this utility model.

[0015] Figure 2 This is a partial three-dimensional view of a centering fixture for a medium-long shaft structure according to this utility model.

[0016] Figure 3 This is a partial three-dimensional view of a centering fixture for a medium-long shaft structure according to this utility model.

[0017] Figure 4This is a partial three-dimensional view of a centering fixture for a medium-long shaft structure according to this utility model.

[0018] from Figures 1 to 4 Including:

[0019] 1. Electric motor A;

[0020] 2. Rotate the disc;

[0021] 3. Rectangular through hole;

[0022] 4. Adjustable distance assembly;

[0023] 5. Centering component;

[0024] 6. Claw positioning block;

[0025] 7. Through groove;

[0026] 8. Drive shaft;

[0027] 9. Floating chuck;

[0028] 10. External gear ring;

[0029] 11. Gear;

[0030] 12. Electric motor B;

[0031] 13. Castings of the middle and long shafts;

[0032] 14. Electric motor C;

[0033] 15. Two-way ball screw;

[0034] 16. Lead screw nut. Detailed Implementation

[0035] The present invention will be further described in conjunction with the following embodiments.

[0036] Example 1.

[0037] like Figure 1-4 As shown, a centering fixture for a medium-length shaft structure includes a motor A1. A rotating disk 2 is mounted on the output shaft of the motor A1. Two rectangular through holes 3 are symmetrically opened on one end face of the rotating disk 2. An adjusting component 4 is movably installed between the two rectangular through holes 3. The adjusting component 4 is located inside the rotating disk 2. A centering component 5 is symmetrically installed on the adjusting component 4 corresponding to the two rectangular through holes 3.

[0038] like Figure 1-4As shown, the centering component 5 includes two jaw positioning blocks 6. The two jaw positioning blocks 6 are respectively installed on the adjusting component 4 in a one-to-one correspondence with two rectangular through holes 3. One end of each jaw positioning block 6 is provided with a through groove 7. A drive shaft 8 is movably installed on each jaw positioning block 6 through a bearing. The drive shaft 8 passes through the through groove 7 and penetrates the jaw positioning block 6.

[0039] like Figure 1-4 As shown, a floating pawl 9 is fixedly installed on each drive shaft 8 at a position inside the through groove 7. The floating pawl 9 has a C-shaped structure, and both ends of the floating pawl 9 have a V-shaped engagement surface structure. A medium-length shaft casting 13 abuts between the two floating pawls 9.

[0040] like Figure 1-4 As shown, each floating jaw 9 is movably mounted to the through slot 7. An external gear ring 10 is mounted on the outer side of one end of each drive shaft 8. Each external gear ring 10 drives a gear 11. A motor B12 is mounted on one side of each jaw positioning block 6. The output shaft of each motor B12 is axially mounted to the gear 11.

[0041] like Figure 1-4 As shown, the pitch adjustment assembly 4 includes a motor C14, which is mounted on the outside of the rotating disk 2. A bidirectional ball screw 15 is axially mounted on the output shaft of the motor C14. The bidirectional ball screw 15 is movably mounted inside the rotating disk 2 via bearings. Two screw nuts 16 are driven on the bidirectional ball screw 15, and a corresponding pawl positioning block 6 is mounted on each screw nut 16.

[0042] like Figure 1-4 As shown, two rectangular through holes 3 are symmetrically opened on one end face of the rotating disk 2 relative to the center of the rotating disk 2.

[0043] When using this utility model, firstly, according to the diameter of the medium-length shaft casting 13, start the motor C14. The motor C14 drives the bidirectional ball screw 15 to rotate. Since the threads at both ends of the bidirectional ball screw 15 rotate in opposite directions, the two screw nuts 16 will move towards or away from each other along the bidirectional ball screw 15, thereby driving the two pawl positioning blocks 6 to move along the rectangular through hole 3, adjusting the distance between the two pawl positioning blocks 6 in the centering assembly 5 to a position that matches the diameter of the medium-length shaft casting 13.

[0044] The middle and long shaft casting 13 is placed between two floating jaws 9. The motor B12 is started, and the motor B12 drives the gear 11 to rotate. The gear 11 meshes with the external gear ring 10, which drives the transmission shaft 8 to rotate. The transmission shaft 8 drives the floating jaws 9 to rotate. By adjusting the angle of the floating jaws 9, the V-shaped contact surface of the floating jaws 9 is made to fit tightly with the middle and long shaft casting 13, so as to achieve the initial centering and clamping of the middle and long shaft casting 13.

[0045] Start motor A1, which drives rotating disk 2 to rotate, and rotating disk 2 drives the middle and long shaft casting 13 to rotate synchronously, so that subsequent machining operations can be carried out. If a slight offset is found in the middle and long shaft casting 13 during the machining process, motor B12 can be started again to finely adjust the angle of floating jaw 9 to ensure that the middle and long shaft casting 13 is always in a precise centering state.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A centering fixture for a medium-long axis structural member, characterized by: Includes motor A, the output shaft of motor A is mounted with a rotating disk, two rectangular through holes are symmetrically opened on one end face of the rotating disk, an adjusting component is movably installed between the two rectangular through holes, the adjusting component is disposed inside the rotating disk, and a centering component is symmetrically installed on the adjusting component corresponding to the two rectangular through holes; The centering assembly includes two jaw positioning blocks, each corresponding to one of the two rectangular through holes, mounted on the adjusting assembly. Each jaw positioning block has a through slot at one end, and a drive shaft is movably mounted on each jaw positioning block via a bearing. The drive shaft passes through the through slot and through the jaw positioning block. A floating jaw is fixedly mounted on each drive shaft at a position inside the through slot, and each floating jaw is movably mounted to the through slot. An external gear ring is mounted on the outer side of one end of each drive shaft, and each external gear ring drives a gear. A motor B is mounted on one side of each jaw positioning block, and the output shaft of each motor B is axially mounted to the gear. A medium-length shaft casting abuts between the two floating jaws.

2. A centering fixture for a medium-long axis structural member as defined in claim 1, characterized in that: The pitch adjustment assembly includes a motor C, which is mounted on the outside of the rotating disk. A bidirectional ball screw is axially mounted on the output shaft of the motor C. The bidirectional ball screw is movably mounted inside the rotating disk via bearings. Two screw nuts are driven on the bidirectional ball screw, and a corresponding chuck positioning block is mounted on each screw nut.

3. A centering fixture for a medium-long axis structural member as defined in claim 2, wherein: The two rectangular through holes are symmetrically formed on one end face of the rotating disk with respect to the center of the rotating disk.

4. A centering fixture for a medium-long axis structural member as defined in claim 3, wherein: The floating claw has a C-shaped structure, and both ends of the floating claw have a V-shaped engagement surface structure.

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