Method for improving connection coaxiality of lead screw and motor, jig and lead screw fixing mechanism

Abstract

The invention relates to a method for improving the connection coaxiality of a lead screw and a motor, a jig and a lead screw fixing mechanism. The method comprises the steps that an auxiliary jig penetrates into a lead screw through hole of a lead screw fixing mechanism, the concentricity of all components in the lead screw fixing mechanism is adjusted to be consistent through the auxiliary jig, and the outer diameter of the part, penetrating into the lead screw through hole, of the auxiliary jig is equal to the outer diameter of a lead screw; the lead screw fixing mechanism is fixed to a machine table, and the auxiliary jig is pulled out; the lead screw is controlled to penetrate out of the lead screw through hole, and the end, penetrating out of the lead screw through hole, of the lead screw is connected with a coupler; and a motor is installed on the machine table, and a motor shaft is connected with the coupler. According to the method, the lead screw fixing mechanism is adjusted in advance through the auxiliary jig before the coupler is installed, so that the coaxiality of the lead screw and the motor shaft is high after the coupler and the motor are installed, and the problem that the lead screw fixing mechanism is difficult to adjust after the coupler and the motor are installed is solved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial automatic control system device manufacturing, and in particular to a method for improving the coaxiality of a screw rod and a motor connection, a fixture and a screw rod fixing mechanism. Background Art

[0002] A screw is a mechanical transmission element, mainly used to convert rotational motion into linear motion, or vice versa. The screw consists of a shaft with a thread and a nut that matches it, and the transmission of motion and force is achieved through the meshing of the threads. In industrial automatic control systems, the screw is mainly connected to the motor shaft through a coupling, and the motor drives the screw to rotate.

[0003] The coupling is an important component used to connect two shafts and transmit torque in the mechanical transmission system. Its installation accuracy directly affects the running stability of the equipment, the transmission efficiency and the service life of key components. In practical applications, the installation of the coupling needs to ensure the coaxiality of the two shafts to avoid problems such as vibration, noise, bearing wear and premature failure of the coupling caused by axis deviation. In the related technology, the screw rod and the motor shaft are generally connected together through a coupling, and then the screw rod is adjusted according to the coaxiality of the screw rod and the motor shaft. However, in some application scenarios, the working space becomes narrower after the coupling and the motor are installed, which makes it more difficult or even impossible to adjust the motor shaft. Summary of the invention

[0004] Based on this, it is necessary to provide a method, a fixture and a screw fixing mechanism to improve the coaxiality of the connection between the screw and the motor to address the problem that in some application scenarios, the working space becomes narrower after the coupling and the motor are installed, which makes it more difficult or even impossible to adjust the motor shaft.

[0005] A method for improving the coaxiality of a screw rod and a motor, comprising: Inserting the auxiliary jig into the screw through hole of the screw fixing mechanism, and adjusting the concentricity of the components in the screw fixing mechanism to be consistent through the auxiliary jig, wherein the outer diameter of the portion of the auxiliary jig that penetrates the screw through hole is equal to the outer diameter of the screw; Fix the screw fixing mechanism on the machine platform and extract the auxiliary fixture; The control screw rod is passed through the screw rod through hole, and one end of the screw rod passing through the screw rod through hole is connected to the coupling; The motor is mounted on the machine platform, and the motor shaft is connected to the coupling.

[0006] In the above method for improving the coaxiality of the connection between the screw and the motor, the auxiliary fixture is first inserted into the screw through hole of the screw fixing mechanism, and the concentricity of each component in the screw fixing mechanism is adjusted to be consistent through the auxiliary fixture, and the outer diameter of the part of the auxiliary fixture that penetrates the screw through hole is equal to the outer diameter of the screw; then the screw fixing mechanism is fixed on the machine platform, and the auxiliary fixture is pulled out; then the screw is controlled to pass through the screw through hole, and one end of the screw passing through the screw through hole is connected to the coupling; finally, the motor is installed on the machine platform, and the motor shaft is connected to the coupling. It can be seen that before the screw rod and the motor shaft are connected through the coupling, the method first adjusts the concentricity of each component in the screw rod fixing mechanism through an auxiliary fixture, so that the connection accuracy is high after the screw rod passes through the screw rod through hole and is connected to the coupling. After the motor shaft is connected to the coupling, the motor shaft and the screw rod have good coaxiality, and there is no need to adjust the screw rod fixing mechanism. This avoids the problem of difficulty in adjusting the screw rod due to limited working space after installing the coupling and the motor.

[0007] A jig using the above method for improving the coaxiality of the connection between the screw and the motor, the jig comprising a correction part cooperating with the screw fixing mechanism, a limiting part connected to the correction part, a base part connected to the limiting part, and a cover part connected to the base part; The cross sections of the correction portion, the limiting portion and the cover portion are all circular, and the cross section of the base portion is square.

[0008] In one embodiment, the central axes of the correction portion, the limiting portion, the base portion and the cover portion coincide with each other.

[0009] In one embodiment, the jig is manufactured in one go.

[0010] In one embodiment, the dimensional tolerance of the fixture is less than ±0.005 mm.

[0011] In one of the embodiments, the end of the correction portion adopts a chamfered structure.

[0012] A screw fixing mechanism matched with the above-mentioned fixture comprises a first angular contact ball bearing, a second angular contact ball bearing, a first bearing spacer, a second bearing spacer and a bearing seat; The first bearing spacer is connected to the first angular contact ball bearing, the first angular contact ball bearing is connected to the second angular contact ball bearing, and the second angular contact ball bearing is connected to the second bearing spacer; The bearing seat is sleeved on the outer sides of the first angular contact ball bearing and the second angular contact ball bearing.

[0013] In one embodiment, a first elastic washer is sleeved on the outer side of the first bearing spacer, and a second elastic washer is sleeved on the outer side of the second bearing spacer.

[0014] In one of the embodiments, the first bearing spacer is connected with a locking nut.

[0015] In one of the embodiments, the bearing seat is respectively connected with a fixing sleeve and a pressure cover, and the fixing sleeve and the pressure cover are respectively installed on two sides of the bearing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for improving the coaxiality of a screw rod and a motor connection according to an embodiment of the present invention; Figure 2 Application of the present invention Figure 1 A schematic diagram of the structure of the fixture of the method shown; Figure 3 for Figure 2 A schematic diagram of the matching structure of the jig and the screw fixing mechanism shown; Figure 4 for Figure 2 Another schematic diagram of the matching structure of the jig and the screw fixing mechanism shown; Figure 5 It is a schematic diagram of the exploded structure of the screw rod fixing mechanism of the present invention; Among them, 10 is an auxiliary fixture, 11 is a correction part, 12 is a limiting part, 13 is a base part, 14 is a cover part, 20 is a first angular contact ball bearing, 30 is a second angular contact ball bearing, 40 is a first bearing spacer, 41 is a first elastic washer, 50 is a second bearing spacer, 51 is a second elastic washer, 60 is a bearing seat, 70 is a locking nut, 80 is a fixing sleeve, and 90 is a pressure cover. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] The invention discloses a method for improving the coaxiality of the connection between a screw rod and a motor, a fixture and a screw rod fixing mechanism.

[0021] like Figure 1 As shown, the method for improving the coaxiality of the connection between the screw rod and the motor includes: Step S1: inserting an auxiliary jig into the screw through hole of the screw fixing mechanism, and adjusting the concentricity of each component in the screw fixing mechanism through the auxiliary jig, wherein the outer diameter of the part of the auxiliary jig that penetrates the screw through hole is equal to the outer diameter of the screw.

[0022] Among them, the auxiliary jig has a higher processing accuracy. By inserting the auxiliary jig into the screw through hole of the screw fixing mechanism, the concentricity of each component in the screw fixing mechanism can be adjusted to be consistent. Compared with the screw, the auxiliary jig has a higher processing accuracy, so the installation of the screw fixing mechanism can be corrected, thereby improving the installation accuracy of the screw fixing mechanism.

[0023] Step S2: Fix the screw fixing mechanism on the machine platform and extract the auxiliary fixture.

[0024] Among them, after the concentricity of each component in the screw fixing mechanism is adjusted to be consistent, the screw fixing mechanism is fixed on the machine platform so that the relative positions of each component in the screw fixing mechanism remain unchanged. After the auxiliary fixture is pulled out of the screw fixing mechanism, the installation accuracy of each component in the screw fixing mechanism fixed on the machine platform can be better maintained.

[0025] Step S3: Control the screw rod to pass through the screw rod through hole, and connect one end of the screw rod passing through the screw rod through hole to a coupling.

[0026] Among them, after completing the adjustment of the screw fixing mechanism, controlling the screw to pass through the screw through hole will make the screw have a higher installation accuracy, and then one end of the screw passing through the screw through hole is connected to half of the coupling.

[0027] Step S4: Install the motor on the machine platform and connect the motor shaft to the coupling.

[0028] After the motor is installed on the machine, the motor shaft is connected to the other half of the coupling. Finally, the two halves of the coupling are aligned and tightened to complete the connection between the screw and the motor shaft.

[0029] In the above method for improving the coaxiality of the connection between the screw and the motor, the auxiliary fixture is first inserted into the screw through hole of the screw fixing mechanism, and the concentricity of each component in the screw fixing mechanism is adjusted to be consistent through the auxiliary fixture, and the outer diameter of the part of the auxiliary fixture that penetrates the screw through hole is equal to the outer diameter of the screw; then the screw fixing mechanism is fixed on the machine platform, and the auxiliary fixture is pulled out; then the screw is controlled to pass through the screw through hole, and one end of the screw passing through the screw through hole is connected to the coupling; finally, the motor is installed on the machine platform, and the motor shaft is connected to the coupling. It can be seen that before the screw rod and the motor shaft are connected through the coupling, the method first adjusts the concentricity of each component in the screw rod fixing mechanism through an auxiliary fixture, so that the connection accuracy is high after the screw rod passes through the screw rod through hole and is connected to the coupling. After the motor shaft is connected to the coupling, the motor shaft and the screw rod have good coaxiality, and there is no need to adjust the screw rod fixing mechanism. This avoids the problem of difficulty in adjusting the screw rod due to limited working space after installing the coupling and the motor.

[0030] The invention also discloses a jig using the method for improving the coaxiality of the connection between the screw rod and the motor.

[0031] like Figure 2 As shown, the jig 10 includes a correction part 11 that cooperates with the screw fixing mechanism, a limiting part 12 connected to the correction part 11, a base part 13 connected to the limiting part 12, and a cover part 14 connected to the base part 13; the cross-sections of the correction part 11, the limiting part 12 and the cover part 14 are all circular, and the cross-section of the base part 13 is square. The outer diameter of the correction part 11 is consistent with the aperture size of the coupling mounting screw, and the processing accuracy of the correction part 11 is high, so that the concentricity of each component in the screw fixing mechanism can be optimized and adjusted. The outer diameter of the limiting part 12 is larger than the outer diameter of the correction part 11, and the feeding distance of the correction part 11 can be limited. The base part 13 can support the correction part 11 and the limiting part 12. The cover part 14 can facilitate the removal of the jig 10.

[0032] The central axes of the correction part 11, the limiting part 12, the base part 13 and the cover part 14 coincide with each other, which is beneficial to improve the processing accuracy of the fixture 10.

[0033] The jig 10 is processed in one step. Processing the jig 10 in one step can reduce the processing error of the jig 10, avoid the accumulation of errors caused by multiple processing, and significantly improve the processing accuracy of the jig 10. Furthermore, the dimensional tolerance of the jig 10 is less than ±0.005 mm.

[0034] The end of the correction part 11 is chamfered, which can eliminate the sharp edge of the correction part 11, avoid the jig 10 from causing harm to the operator during use, and disperse the stress of the jig 10 to increase the service life of the jig 10.

[0035] It can be seen that the jig is combined with the above-mentioned method of improving the coaxiality of the connection between the screw and the motor, so that after the coupling and the motor are installed, the motor shaft and the screw have a higher coaxiality, thereby improving the service life of the coupling.

[0036] The present invention also discloses a screw fixing mechanism matched with the fixture 10 .

[0037] like Figures 3 to 5 As shown, the screw fixing mechanism includes a first angular contact ball bearing 20, a second angular contact ball bearing 30, a first bearing spacer 40, a second bearing spacer 50 and a bearing seat 60; the first bearing spacer 40 is connected to the first angular contact ball bearing 20, the first angular contact ball bearing 20 is connected to the second angular contact ball bearing 30, and the second angular contact ball bearing 30 is connected to the second bearing spacer 50; the bearing seat 60 is sleeved on the outside of the first angular contact ball bearing 20 and the second angular contact ball bearing 30.

[0038] The first angular contact ball bearing 20 and the second angular contact ball bearing 30 can bear axial and radial loads at the same time, and perform high-precision positioning of the screw during the operation of the screw. Moreover, the first angular contact ball bearing 20 and the second angular contact ball bearing 30 reduce the clearance during the operation of the screw and improve the repeated positioning accuracy of the screw. Furthermore, the first angular contact ball bearing 20 and the second angular contact ball bearing 30 have high rigidity, which can effectively resist the deformation of the screw during operation and ensure the stability of the system.

[0039] The first elastic washer 41 is sleeved on the outer side of the first bearing spacer 40, and the second elastic washer 51 is sleeved on the outer side of the second bearing spacer 50. The first elastic washer 41 and the second elastic washer 51 can fill the gaps between the first bearing spacer 40, the second bearing spacer 50 and other components to prevent foreign objects such as dust and impurities from entering the first angular contact ball bearing 20 and the second angular contact ball bearing 30; at the same time, the first elastic washer 41 and the second elastic washer 51 can improve the sealing performance of the bearing seat 60 and reduce the leakage of lubricant.

[0040] The first bearing spacer 40 is connected with a locking nut 70. The locking nut 70 can lock the first angular contact ball bearing 20 and the second angular contact ball bearing 30 to ensure that the first angular contact ball bearing 20 and the second angular contact ball bearing 30 do not undergo axial displacement during operation, and prevent the first angular contact ball bearing 20 and the second angular contact ball bearing 30 from being loosened and disengaged from the predetermined position in a high-speed rotation and vibration environment.

[0041] Among them, the bearing seat 60 is respectively connected with a fixing sleeve 80 and a pressure cover 90, and the fixing sleeve 80 and the pressure cover 90 are respectively installed on both sides of the bearing seat 60. The fixing sleeve 80 can fix and support the bearing seat 60, ensure that the bearing seat 60 remains stable during operation, and provide accurate axial positioning and radial positioning for the screw. By setting the fixing sleeve 80, the rigidity, coaxiality and operating stability of the screw transmission system can be improved, and the service life of the screw can be improved. The pressure cover 90 is connected to the bearing seat 60 by bolts, and the first angular contact ball bearing 20 and the second angular contact ball bearing 30 are fixed inside the bearing seat 60, ensuring that the first angular contact ball bearing 20 and the second angular contact ball bearing 30 do not undergo axial displacement during operation. Further, the pressure cover 90 can also close the opening of the bearing seat 60 to prevent foreign matter such as dust and impurities from entering, and reduce the wear and damage of the first angular contact ball bearing 20 and the second angular contact ball bearing 30.

[0042] It can be seen that the screw fixing mechanism is combined with the above-mentioned fixture and the method for improving the coaxiality of the connection between the screw and the motor. The screw fixing mechanism is adjusted by the fixture. After the coupling and the motor are installed, the motor shaft and the screw have good coaxiality, avoiding the problem of limited working space and difficult adjustment caused by adjusting the screw fixing mechanism after the coupling and the motor are installed.

[0043] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for improving the coaxiality of the connection between the screw rod and the motor, characterized in that: include: Inserting the auxiliary jig into the screw through hole of the screw fixing mechanism, and adjusting the concentricity of the components in the screw fixing mechanism to be consistent through the auxiliary jig, wherein the outer diameter of the portion of the auxiliary jig that penetrates the screw through hole is equal to the outer diameter of the screw; Fix the screw fixing mechanism on the machine platform and extract the auxiliary fixture; The control screw rod is passed through the screw rod through hole, and one end of the screw rod passing through the screw rod through hole is connected to the coupling; The motor is mounted on the machine platform, and the motor shaft is connected to the coupling.

2. A jig for applying the method for improving the coaxiality of the connection between the screw rod and the motor as claimed in claim 1, characterized in that: The fixture comprises a correction part cooperating with the screw fixing mechanism, a limiting part connected to the correction part, a base part connected to the limiting part, and a cover part connected to the base part; The cross sections of the correction portion, the limiting portion and the cover portion are all circular, and the cross section of the base portion is square.

3. The fixture according to claim 2, characterized in that: The central axes of the correction part, the limiting part, the base part and the cover part coincide with each other.

4. The fixture according to claim 3, characterized in that: The jig is manufactured in one step.

5. The fixture according to claim 4, characterized in that: The dimensional tolerance of the fixture is less than ±0.005 mm.

6. The fixture according to claim 5, characterized in that: The end of the correction part adopts a chamfered structure.

7. A screw fixing mechanism for use with the fixture according to any one of claims 2 to 6, characterized in that: It includes a first angular contact ball bearing, a second angular contact ball bearing, a first bearing spacer, a second bearing spacer and a bearing seat; The first bearing spacer is connected to the first angular contact ball bearing, the first angular contact ball bearing is connected to the second angular contact ball bearing, and the second angular contact ball bearing is connected to the second bearing spacer; The bearing seat is sleeved on the outer sides of the first angular contact ball bearing and the second angular contact ball bearing.

8. The screw rod fixing mechanism according to claim 7, characterized in that: A first elastic washer is sleeved on the outer side of the first bearing spacer, and a second elastic washer is sleeved on the outer side of the second bearing spacer.

9. The screw rod fixing mechanism according to claim 8, characterized in that: The first bearing spacer is connected with a locking nut.

10. The screw rod fixing mechanism according to claim 9, characterized in that: The bearing seat is respectively connected with a fixing sleeve and a pressure cover, and the fixing sleeve and the pressure cover are respectively installed on both sides of the bearing seat.

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