CN113375851B - Linear motor thrust test fixture - Google Patents
Linear motor thrust test fixture Download PDFInfo
- Publication number
- CN113375851B CN113375851B CN202110552728.5A CN202110552728A CN113375851B CN 113375851 B CN113375851 B CN 113375851B CN 202110552728 A CN202110552728 A CN 202110552728A CN 113375851 B CN113375851 B CN 113375851B
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- Prior art keywords
- screw
- sliding sleeve
- thrust
- ejector rod
- motor
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- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 230000004323 axial length Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/12—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring axial thrust in a rotary shaft, e.g. of propulsion plants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a linear motor thrust testing tool, which comprises a push rod, wherein the push rod is arranged on the push rod; the ejector rod is axially nested and inserted in the sliding sleeve, the rear end of the ejector rod is fixedly provided with a screw nut, the screw nut is sleeved on the ball screw, the rear end of the ball screw is driven to rotate by a linear stepping motor, and the screw nut converts the rotational motion of the ball screw into linear motion; a mounting seat is arranged between the ejector rod and the sliding sleeve and is fixed in the sliding sleeve, a boss is arranged on the inner surface of the mounting seat, a groove is arranged on the ejector rod corresponding to the boss, and the axial length of the groove is greater than that of the boss. The invention is simple, convenient, accurate and reliable, improves the working efficiency of testing the thrust, reduces the production cost, improves the accuracy and the reliability of testing the thrust of the motor, and avoids the resource waste caused by the damage of the ball screw in the process of testing the thrust of the motor.
Description
Technical Field
The invention relates to a linear motor thrust testing tool.
Background
The linear stepping motor is required to be subjected to motor thrust test by using a thrust test tool, whether the ball screw of the linear stepping motor is damaged or not is determined by the advantages and disadvantages of the thrust test tool, the accuracy and the reliability of the thrust test are determined, the ball screw is easily damaged by the conventional thrust test tool, the ball screw is generally expensive, the manufacturing period is long, and the manufacturing cost and the production period of the motor are seriously affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides the linear motor thrust testing tool which is simple, convenient, accurate and reliable, improves the working efficiency of testing thrust, reduces the production cost and improves the accuracy and reliability of motor thrust testing.
The invention is realized by the following technical scheme.
The invention provides a linear motor thrust testing tool, which comprises a push rod; the ejector rod is axially nested and inserted in the sliding sleeve, the rear end of the ejector rod is fixedly provided with a screw nut, the screw nut is sleeved on the ball screw, the rear end of the ball screw is driven to rotate by a linear stepping motor, and the screw nut converts the rotational motion of the ball screw into linear motion; a mounting seat is arranged between the ejector rod and the sliding sleeve and is fixed in the sliding sleeve, a boss is arranged on the inner surface of the mounting seat, a groove is arranged on the ejector rod corresponding to the boss, and the axial length of the groove is greater than that of the boss.
The sliding sleeve and the mounting seat are fixed through sliding sleeve screws.
The screw nut and the ejector rod are guided by the piston and axially slide, and the screw nut and the piston are fixed by a piston screw.
The position of the sliding sleeve, which is positioned at the rear end of the mounting seat, is also provided with an adapter plate which is used for adapting and limiting the linear stepping motor and the mounting seat.
The adapter plate is fixed on the mounting seat through the adapting screw.
The ball screw is characterized in that a shaft sleeve is arranged at the rear end of the ball screw and used for limiting a screw nut, and the shaft sleeve is fixed through a set screw.
The front end of the shaft sleeve is provided with a rubber pad.
The outer diameter of the front end surface of the ejector rod is the same as the integral outer diameter of the sliding sleeve.
The invention has the beneficial effects that: the thrust testing device is simple, convenient, accurate and reliable, improves the working efficiency of testing thrust, reduces the production cost, improves the accuracy and the reliability of motor thrust testing, and avoids resource waste caused by damage to the ball screw in the thrust testing process of the motor.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view taken along the A-A plane of FIG. 1;
FIG. 3 is a cross-sectional view taken along the B-B plane in FIG. 1;
FIG. 4 is a schematic diagram of the linear stepper motor of FIG. 1;
fig. 5 is a schematic structural view of an embodiment of the linear stepper motor of fig. 1.
In the figure: the device comprises a 1-ejector rod, a 2-sliding sleeve, a 3-mounting seat, a 4-sliding sleeve screw, a 5-piston, a 6-piston screw, a 7-adapting screw, an 8-rubber pad, a 9-shaft sleeve, a 10-set screw, an 11-adapting plate, a 12-linear stepping motor, a 13-ball screw, a 14-screw nut, a 15-supporting sleeve, a 16-key, a 17-ejector rod screw, an 18-wire outlet sheath, a 19-bearing, a 20-rear end cover, a 21-stator, a 22-rotor, a 23-front end cover, a 24-bearing baffle plate and a 25-motor nut.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
Example 1
The linear motor thrust test fixture as shown in fig. 1 to 5 comprises a push rod 1; the ejector rod 1 is axially nested and inserted in the sliding sleeve 2, a screw nut 14 is fixed at the rear end of the ejector rod 1, the screw nut 14 is sleeved on the ball screw 13, the linear stepping motor 12 is arranged at the rear end of the ball screw 13 to drive rotation, and the screw nut 14 converts the rotation motion of the ball screw 13 into linear motion; the method comprises the steps of carrying out a first treatment on the surface of the A mounting seat 3 is arranged between the ejector rod 1 and the sliding sleeve 2 and is fixed in the sliding sleeve 2, a boss is arranged on the inner surface of the mounting seat 3, a groove is arranged on the ejector rod 1 corresponding to the boss, and the axial length of the groove is greater than that of the boss.
Example 2
Based on embodiment 1, and, the sliding sleeve 2 and the mounting seat 3 are fixed by a sliding sleeve screw 4.
Example 3
Based on embodiment 1, and, the lead screw nut 14 and the jack 1 are guided by the piston 5 and axially slid, the lead screw nut 14 and the piston 5 are fixed by the piston screw 6.
Example 4
Based on the embodiment 1, the position of the sliding sleeve 2 at the rear end of the mounting seat 3 is also provided with an adapter plate 11 for switching and limiting the linear stepping motor 12 and the mounting seat 3.
Example 5
Based on embodiment 4, and, the adapter plate 11 is fixed to the mount 3 by the adapter screw 7.
Example 6
Based on embodiment 1, and, a shaft sleeve 9 is provided at the rear end position of the ball screw 13 for limiting a screw nut 14, the shaft sleeve 9 is fixed by a set screw 10.
Example 7
Based on example 6, and, the front end of the sleeve 9 has a rubber pad.
Example 8
Based on the embodiment 1, the outer diameter of the front end surface of the ejector rod 1 is the same as the overall outer diameter of the sliding sleeve 2.
Example 9
Based on the above embodiment, as shown in particular in figures 1 to 3,
the ejector rod 1 is used for jacking and pushing out the weight;
the sliding sleeve 2 is used for limiting and axially guiding;
the mounting seat 3 is used for limiting and axially guiding, and the end face of the mounting seat which extends inwards is also used for protecting the ball screw from damage caused by exceeding the range;
the sliding sleeve screw 4 (specification M5×20) is used for axially fixing the sliding sleeve 2 and the mounting seat 3;
the piston 5 is used for limiting and axially guiding, and axially connecting the screw nut 14 and the ejector rod 1, and transmitting thrust generated by the screw nut to the ejector rod;
the screw nut 14 and the ball screw 13 convert the rotational output torque generated by the stepper motor into linear thrust;
a piston screw 6 (specification m2×6) for axially fixing the lead screw nut 14 and the piston 5;
the adapting screw 7 (specification M4×20) is used for axially fixing the mounting base 3 and the adapting plate 11;
the rubber pad 8 is used for buffering, if the ball screw cannot bear the applied load, the load will be instantaneously smashed to the screw nut, the screw nut will drop vertically downwards to generate larger impact force, the rubber pad is used for slowing down the dropping speed of the screw nut, reducing the impact force and protecting the screw nut from being damaged by collision, at the moment, the shaft sleeve 9 is used for preventing the ball screw from being damaged by exceeding the stroke when falling, and is divided into two halves, and the two halves are fastened on two sides of the ball screw when in use and fastened by screws;
the set screw 10 is used for fixing the shaft sleeve 9, the ball screw 13 and the stepping motor 12;
the adapter plate 11 is used for connecting the fixed mounting seat 3 and the stepping motor 12;
the supporting sleeve 15 is used for contacting with the ground and transferring the action of supporting the pushed heavy object, so that all tools except the supporting sleeve can be separated from the ground;
the key 16 is used for guiding, sliding and limiting;
the ejector rod screw 17 (specification M3×4) is used for fixing the mounting seat 3 and the ejector rod 1;
example 10
Based on embodiment 9, and as shown in fig. 4, the wire-out sheath 18 is used for wire-out, preventing the wire from being cut by metal inside the motor;
the bearing 19 is a vacuum coating thrust bearing and is used for separating the stationary motor stator, the front end cover, the rear end cover and the rotor, so as to play a role in guiding the rotation of the shaft and reducing the friction between the shaft and the end covers;
the rear end cover 20 is used for motor assembly, and an inner spigot and a threaded hole of the rear end cover are used for fixing a motor stator 21 and a front end cover 23; the front end cover 23 is used for motor assembly, and the inner spigot and the through hole are used for fixing the motor stator 21 and the rear end cover 20; the outer spigot and the mounting hole are used for mounting a user mechanism; the bearing chambers of the front end cover 23 and the rear end cover 20 are used for installing the bearing 19, and the size of the bearing chambers is required to be processed according to the bearing size of the test motor. The front end cover and the rear end cover play a role in supporting the rotor to ensure an air gap, and in order to ensure the requirement of a small air gap, the end cover spigot and the end face are assembled with the inner hole of the stator 21 and the end face in a positioning way, so that the coaxiality of the end cover spigot and the bearing chamber is ensured, and the matched end face and the bearing chamber are perpendicular. Therefore, the front end cover and the rear end cover are processed by titanium alloy TC4R, and the reliability of bearing installation is ensured.
The stator 21 includes a stator core, windings, insulating materials, and lead wires for generating a radial magnetic field and an axial magnetic field, and driving the motor rotor (bearing) to rotate, which are important constituent parts of the motor.
The rotor 22 is composed of a rotor core, magnetic steel, a shaft and a shaft sleeve, is a rotating part of the motor, is used for installing a bearing, and mainly converts electric energy of the motor into rotational mechanical energy, and is an important component of the motor.
The bearing baffle 24 and the motor nut 25 are assembled and used, and all parts are processed independently and used for axially pre-tightening the thrust bearing 19 and bearing the important thrust action of the motor in the axial direction.
As shown in fig. 5, the general working steps are as follows:
a) The ball screw can drive the piston to reciprocate between I, II positions according to the axial force given by the stepping motor;
b) And (3) assembling a thrust test tool, wherein the thrust test tool is lubricated by using Mobil grease (XHP 222) in the assembling process. After the assembly is completed, the stepping motor is electrified, and the piston is enabled to run for 5 cycles according to the cycle sequence of I, II and I, so that the lubricating grease fully lubricates the thrust test tool. Placing the weight on a base of a KX100A thrust test table (comprising a weight table, a strut and a base), assembling a stress application contact between a thrust test tool and the weight table, placing weights on the weight table after the assembling is completed, and controlling the total weight of the weights and the weight table within a certain range according to actual working conditions;
c) Static load thrust test
Before the motor test, the screw nut is pushed to the middle position of the effective stroke by hand (namely, the piston is pushed to the middle position shown in fig. 1), any one phase (A, B, C, D any one phase) of the motor four-phase winding and the common end 0 are respectively connected with the two ends of a power supply of rated current, weights are added on a weight table, and static load axial thrust is measured. During testing, four-phase windings A0, B0, C0 and D0 are respectively connected with two ends of a power supply.
In the testing process, after the motor rotor rotates, the stress application contact is separated from the test tool immediately, and the power is cut off after the added weight is removed, so that the damage caused by the over-stroke of the ball screw is prevented. Before the motor is electrified to test the static load thrust, the piston is pushed to the middle position shown in fig. 1.
d) Dynamic load thrust test
Before the motor is tested, the ball screw nut is pushed to a limit position by hand (the length of the end part of the ball screw nut is about 3mm away from the root end of a motor shaft, namely, a piston is pushed to the position I in fig. 1, the motor is connected with wires according to requirements, the ball screw nut is electrified in the direction away from the motor shaft, the winding gradually applies load torque to the motor in the driving state of rated voltage until the motor is out of step, the load torque value when the motor is out of step is recorded, and the converted value is the dynamic load thrust of the motor.
In the test process, if the power-on reaches the upper limit value of the test time (the end face of the screw nut is separated from the screw lead), the dynamic load thrust is not measured, the stress application contact is separated from the test tool immediately, the rotating direction of the motor is changed, the motor is enabled to rotate in the same time as the anticlockwise rotating power-on time, the piston is enabled to rotate to the position I in the figure 1, the stress application contact is contacted with the test tool, the motor is connected according to the requirement, the dynamic load thrust is continuously tested by adding weights, and the test process is repeated. Before the motor is powered on each time to test the dynamic load thrust, the piston should be pushed to the position I in figure 1.
When the device is used, the device is required to rotate 90 degrees clockwise, the motor is electrified to rotate to generate output torque by applying load on the ejector rod, the ball screw nut 1 converts the output torque into linear thrust to push the sliding sleeve, and the ejector rod and the load applied above the ejector rod linearly upwards run. The end face extending out of the mounting seat is used for limiting the sliding sleeve to maximally move to the end face position, so that the ball screw is prevented from falling out of the screw lead from the left end face to fail, wherein the distance from I to II is a value obtained by subtracting a total of 5mm of safety protection distances of two ends from the ball screw lead, the rubber pad is used for reducing impact force of the ball screw nut 1 when the ball screw nut drops instantly, the ball screw nut 1 is protected, and the shaft sleeve is used for limiting the ball screw nut 1 from falling out of the screw lead to fail.
The calculation relation between the static load axial force output by the ball screw and the torque output by the stepping motor is shown in formula 1:
T＝F×L×η/(2×π).......................................(1)
wherein:
t-motor output torque, N.mm;
f, axial thrust and N;
l-lead screw lead, mm
η—screw efficiency.
The calculation relation between the dynamic load axial force output by the ball screw and the output torque of the stepping motor is shown in formula 2:
T＝F×L/(2×π×η).......................................(2)
wherein:
t-motor output torque, N.mm;
f, axial thrust and N;
l-lead screw lead, mm
η—screw efficiency.
Claims (4)
1. The utility model provides a linear electric motor thrust test fixture, includes ejector pin (1), its characterized in that: the ejector rod (1) is axially nested and inserted in the sliding sleeve (2), a screw nut (14) is fixed at the rear end of the ejector rod (1), the screw nut (14) is sleeved on the ball screw (13), the linear stepping motor (12) is arranged at the rear end of the ball screw (13) to drive rotation, and the screw nut converts the rotational motion of the ball screw into linear motion; a mounting seat (3) is arranged between the ejector rod (1) and the sliding sleeve (2) and is fixed in the sliding sleeve (2), a boss is arranged on the inner surface of the mounting seat (3), a groove is arranged on the ejector rod (1) at a position corresponding to the boss, and the axial length of the groove is larger than that of the boss;
placing a thrust test tool on a base of a KX100A thrust test table, wherein the thrust test table comprises a weight table, a support column and a base, assembling a stress application contact between the thrust test tool and the weight table, and placing weights on the weight table after the assembling is completed;
the screw nut (14) and the ejector rod (1) are guided by the piston (5) and axially slide, and the screw nut (14) and the piston (5) are fixed by a piston screw (6);
the sliding sleeve (2) is positioned at the rear end of the mounting seat (3), and the adapter plate (11) is used for adapting and limiting the linear stepping motor (12) and the mounting seat (3);
the rear end of the ball screw (13) is provided with a shaft sleeve (9) for limiting a screw nut (14), and the shaft sleeve (9) is fixed through a set screw (10);
the outer diameter of the front end surface of the ejector rod (1) is the same as the integral outer diameter of the sliding sleeve (2).
2. The linear motor thrust testing tool of claim 1, wherein: the sliding sleeve (2) and the mounting seat (3) are fixed through sliding sleeve screws (4).
3. The linear motor thrust testing tool of claim 1, wherein: the adapter plate (11) is fixed on the mounting seat (3) through the adapter screw (7).
4. The linear motor thrust testing tool of claim 1, wherein: the front end of the shaft sleeve (9) is provided with a rubber pad (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110552728.5A CN113375851B (en) | 2021-05-20 | 2021-05-20 | Linear motor thrust test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110552728.5A CN113375851B (en) | 2021-05-20 | 2021-05-20 | Linear motor thrust test fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113375851A CN113375851A (en) | 2021-09-10 |
| CN113375851B true CN113375851B (en) | 2023-10-31 |
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| CN202110552728.5A Active CN113375851B (en) | 2021-05-20 | 2021-05-20 | Linear motor thrust test fixture |
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| CN101520353A (en) * | 2009-03-30 | 2009-09-02 | 哈尔滨工业大学 | Device for testing constant thrust load of continuous linear motor |
| CN204788741U (en) * | 2015-07-10 | 2015-11-18 | 常州市鼎智机电有限公司 | Lead screw step motor thrust test fixture |
| CN107314851A (en) * | 2017-07-31 | 2017-11-03 | 哈尔滨工业大学 | Linear motor thrust testing device and the method using the measurement device force oscillation |
| CN208091612U (en) * | 2018-03-26 | 2018-11-13 | 常州市鼎智机电有限公司 | Lead screw motor propulsion test device |
| CN208953675U (en) * | 2018-10-26 | 2019-06-07 | 深圳市富源盛电子科技有限公司 | Motor load tester |
| CN110412465A (en) * | 2019-08-06 | 2019-11-05 | 哈尔滨工业大学 | Double lead-screw synchronizes drive type straight-line electromechanical testing platform |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692118A (en) * | 2009-10-19 | 2010-04-07 | 上海电机学院 | Testing device and testing method of linear motor |
| CN102866355B (en) * | 2012-09-25 | 2014-10-29 | 上海理工大学 | Linear motor power performance testing device used for numerical control direct feeding shaft |
| CN106324499B (en) * | 2016-08-02 | 2019-04-09 | 东南大学 | A kind of linear rotating motor dynamic performance and testing and its test method |
-
2021
- 2021-05-20 CN CN202110552728.5A patent/CN113375851B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520353A (en) * | 2009-03-30 | 2009-09-02 | 哈尔滨工业大学 | Device for testing constant thrust load of continuous linear motor |
| CN204788741U (en) * | 2015-07-10 | 2015-11-18 | 常州市鼎智机电有限公司 | Lead screw step motor thrust test fixture |
| CN107314851A (en) * | 2017-07-31 | 2017-11-03 | 哈尔滨工业大学 | Linear motor thrust testing device and the method using the measurement device force oscillation |
| CN208091612U (en) * | 2018-03-26 | 2018-11-13 | 常州市鼎智机电有限公司 | Lead screw motor propulsion test device |
| CN208953675U (en) * | 2018-10-26 | 2019-06-07 | 深圳市富源盛电子科技有限公司 | Motor load tester |
| CN110412465A (en) * | 2019-08-06 | 2019-11-05 | 哈尔滨工业大学 | Double lead-screw synchronizes drive type straight-line electromechanical testing platform |
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