CN106670510B - A kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control - Google Patents
A kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control Download PDFInfo
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- CN106670510B CN106670510B CN201611170299.0A CN201611170299A CN106670510B CN 106670510 B CN106670510 B CN 106670510B CN 201611170299 A CN201611170299 A CN 201611170299A CN 106670510 B CN106670510 B CN 106670510B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/007—Arrangements for observing, indicating or measuring on machine tools for managing machine functions not concerning the tool
- B23Q17/008—Life management for parts of the machine
Abstract
A kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control of the present invention, the system comprises main shaft bearing temperature rise on-Line Monitor Device, controller and hydraulic regulating devices；Main shaft bearing temperature rise on-Line Monitor Device for acquiring the temperature rise signal of main shaft bearing in real time；Hydraulic regulating device includes the hydraulic sliding sleeve that rear end main shaft bearing periphery is arranged in, it is mounted on hydraulic sliding sleeve periphery and forms the rear end bearing seat of closed annular hydraulic oil pocket with hydraulic sliding sleeve, the preceding end bearing block of front end main shaft bearing periphery is set, the spring socket of end bearing block rear end before being fixed on, preloading spring in spring socket is set, the hydraulic control system being connected to annular hydraulic oil pocket；Controller connects hydraulic control system control terminal by power amplifier；The temperature rise signal of the input terminal connection main shaft bearing temperature rise on-Line Monitor Device output of controller；Preloading spring is connect after being compressed with hydraulic sliding sleeve front end, applies initial pretightening force to main shaft bearing.
Description
Technical field
The invention belongs to intelligent main shaft field, it is related to for the monitoring of machine tool chief axis operational situation and bearing under different rotating speeds
The regulation of pretightning force, specially a kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control.
Background technique
Now, main shaft is suffered from each industrial circle volume and is widely applied.Such as lathe kernel component it
One, the static characteristics such as running accuracy, rigidity and thermal characteristics can all directly influence the efficiency and quality of machine tooling.Bearing is made
For the important spare part of supporting spindle operating, performance can generate important influence to axis system.Wherein, bearing appropriate is pre-
Clamp force can increase bearing rigidity, reduce bearing deformation, improves spindle rotation accuracy, reduces vibration, extends the service life of axis system.
In general, giving the biggish pretightning force of bearing, usually when the revolving speed of machine tool chief axis is lower to improve bearing and machine tool chief axis system
The rigidity for entirety of uniting；When the revolving speed of main shaft is higher, bearing pre-fastening is usually gradually decreased, to reduce the temperature of machine-tool spindle system
It rises.It is therefore desirable to carry out real-time monitoring to the machine tool chief axis temperature rise under different rotating speeds, and on this basis according to actual condition
The pretightning force for regulating and controlling machine tool mainshaft bearing controls the temperature rise of machine-tool spindle system in the reasonable scope.
The principle of adjustment and control of main shaft bearing pretightning force has following several at present: electromagnetism loading technique is applied to bearing pre-tightened by 1.
In the regulation of power, by changing size of current in coil, change electromagnetic force, to change bearing pre-fastening；2. using mounted in master
Piezoelectric actuator inside axis applies active force to bearing outer ring, realizes the change of bearing pre-fastening；3. passing through machinery appropriate
Centrifugal force is converted into acting on the axial force on bearing by structure, realizes that bearing pre-fastening changes.
In above-mentioned main shaft bearing pretightning force principle of adjustment and control: the volume of the first scheme regulation device can be very big, in internal junction
Structure is compact, in the lesser occasion in space using being limited significantly；Piezoelectric actuator of the second scheme for regulation exists
The problem of being easy aging and brake force is caused to decline, is limited significantly so as to cause service life；The third scheme is difficult to realize
The accurate quantification of bearing pre-fastening regulates and controls.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of machine tool mainshaft bearing preload based on hydraulic control
Power automatic regulating system and method are designed a set of pretightning force regulation mechanical device, are used for general lathe using hydraulic control technology
The regulation of axis system middle (center) bearing pretightning force.
The present invention is to be achieved through the following technical solutions:
A kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control, including main shaft bearing temperature rise are online
Monitoring device, controller and hydraulic regulating device；
The main shaft bearing temperature rise on-Line Monitor Device for acquiring the temperature rise signal of main shaft bearing in real time；
The hydraulic regulating device includes the hydraulic sliding sleeve that rear end main shaft bearing periphery is arranged in, and is mounted on hydraulic sliding sleeve
Periphery and the rear end bearing seat that closed annular hydraulic oil pocket is formed with hydraulic sliding sleeve, before front end main shaft bearing periphery is set
End bearing block, the spring socket of end bearing block rear end, is arranged in the preloading spring in spring socket, with annular hydraulic before being fixed on
The hydraulic control system of oil pocket connection；
The controller connects hydraulic control system control terminal by power amplifier；The input terminal of controller connects master
The temperature rise signal of axle bearing temperature rise on-Line Monitor Device output；
Preloading spring is connect after being compressed with hydraulic sliding sleeve front end, applies initial pretightening force to main shaft bearing；Work as controller
When receiving the bearing temperature rise in temperature rise signal more than the bearing temperature rise threshold value set, controller controls hydraulic control system and increases
Hydraulic oil power output, until bearing temperature rise threshold value of the bearing temperature rise lower than setting.
Preferably, the main shaft bearing temperature rise on-Line Monitor Device includes data collector and temperature sensor；Temperature
Sensor corresponds to each main shaft bearing setting, for acquiring the temperature rise signal of corresponding main shaft bearing in real time；Data collector it is defeated
Enter end and connect all temperature sensors, output end connects controller input terminal.
Further, it is respectively equipped with threaded hole on the corresponding position of hydraulic sliding sleeve and rear end bearing seat and preceding end bearing block, temperature
Degree sensor is mounted on corresponding main shaft bearing by threaded hole.
Preferably, the spring socket is annularly arranged, and multiple preloading springs are evenly arranged on spring socket.
Preferably, there are four the main shaft bearing is arranged altogether, it is divided into two groups of front and back, every group of two main shaft bearings are in
Arranged in series is in back-to-back configuration between two groups；The inside of preceding end bearing block and the rear end outer ring of preceding group of bearing are clamped；Hydraulic cunning
The inside and rear end main shaft bearing front end outer ring of set are clamped.
Preferably, the inner ring of main shaft bearing is positioned by being set in positioning ring on main shaft respectively, and the front end of preceding end bearing block is set
Set fixed drive end bearing bracket, the fixed rear end cap of the rear end setting of rear end bearing seat.
Preferably, it is provided on hydraulic sliding sleeve and the contact surface of rear end bearing seat for the hydraulic of annular hydraulic oil pocket sealing
Sealing ring.
Preferably, the hydraulic control system includes fuel tank, be connected in turn the motor of fuel tank oil outlet, filter and
Check valve and oil outlet；Check valve output end one successively connects oil outlet with proportional pressure control valve through electrohydraulic servo valve, another
Branch connects oil outlet through pressure retaining valve；Oil outlet connects fuel tank oil inlet end with flowmeter through cooler；Pressure retaining valve connects oil outlet one
Pressure gauge is arranged in side, and accumulator is arranged in the other side.
A kind of machine tool mainshaft bearing pretightning force Automatic adjustment method based on hydraulic control, based on above-mentioned any automatic tune
Section system, includes the following steps,
Step 1, the temperature rise simulation letter of main shaft bearing is detected by the way that the temperature sensor at the main shaft bearing of front and back end is arranged in
Number；
Step 2, temperature analog signal is through data collector, then is input in controller and is handled, any when acquisition
When the temperature rise of one main shaft bearing is higher than setting temperature rise threshold value, controller generates control instruction output；
Step 3, control instruction is increased by the valve core rotation of power amplifier control hydraulic control system electrohydraulic servo valve
The oil pressure of oil outlet, to increase the pressure of annular hydraulic oil pocket；
Step 4, the pressure of annular hydraulic oil pocket is transmitted to by spring socket by hydraulic sliding sleeve, and then reduces and acts on master
Bearing pre-fastening on axle bearing outer ring；
Step 5, the control instruction for often receiving controller output is primary, and the pressure of annular hydraulic oil pocket just increases Δ p, weight
Multiple step 1-4, bearing temperature rise gradually decrease, and until the bearing temperature rise temperature threshold lower than setting, controller controls hydraulic control
System keeps current oil pressure to stablize.
Preferably, when hydraulic control system is started to work, motor rotation drives the hydraulic oil in fuel tank to enter oil circuit, and
It is exported by filter and check valve, electrohydraulic servo valve and proportional pressure control valve control the oil pressure size of oil outlet, pressure gauge
The oil pressure of real-time monitoring oil outlet and by data feedback to electrohydraulic servo valve；When the pressure of oil outlet is met the requirements, pressure retaining valve
It opens, and guarantees that the pressure of oil outlet is stablized in steady state value by accumulator.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention is a kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control, for not
With the monitoring of machine-tool spindle system temperature rise under revolving speed, and regulate and control bearing pre-fastening on this basis, guarantees the temperature rise of axis system
Control in the reasonable scope, extends the service life of axis system.It is hydraulic by the pretightning force based on front and back end bearing block of setting
Regulation device has universal applicability suitable for general machine-tool spindle system.Sky needed for the hydraulic regulating device of pretightning force
Between small, the function that can be obtained and making minor adjustment to the original part of axis system without influencing to change original axis system
Energy.By using hydraulic control technology, the technology and methods are more mature and perfect, so in the vibration regulation process of main shaft
In it is more succinct and stablize.
Further, hydraulic control system oil outlet is equipped with pressure sensor and pressure gauge, and data are again anti-
It is fed in electrohydraulic servo valve, forms closed-loop system, guarantee that the intracavitary pressure of annular hydraulic is steady state value.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of system of the present invention.
Fig. 2 is the principle sketch of hydraulic control system of the present invention.
In figure: 1 is main shaft, and 2 be rear end main shaft bearing, and 3 be preloading spring, and 4 be spring socket, and 5 be hydraulic sliding sleeve, and 6 are
Rear end bearing seat, 7 be temperature sensor, and 8 be annular hydraulic chamber, and 9 be rear end cap, and 10 be positioning ring, and 11 be preceding end bearing block, 12
It is data collection system for drive end bearing bracket, 13,14 be controller, and 15 be power amplifier, and 16 be hydraulic control system, and 17 be hydraulic
Sealing ring, 18 be motor, and 19 be filter, and 20 be check valve, and 21 be electrohydraulic servo valve, and 22 be proportional pressure control valve, and 23 be accumulation of energy
Device, 24 be pressure retaining valve, and 25 be pressure gauge, and 26 be oil outlet, and 27 be cooler, and 28 be flowmeter, and 29 be fuel tank.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
System of the present invention can be used for the monitoring of machine-tool spindle system temperature rise under different rotating speeds, and regulate and control on this basis
Bearing pre-fastening, the temperature rise control for guaranteeing axis system in the reasonable scope, extend the service life of axis system.The system is by leading
Three axle bearing temperature rise on-Line Monitor Device, controller and hydraulic regulating device parts form.
The main shaft bearing temperature rise on-Line Monitor Device is for measuring and handling the real-time temperature rise signal of main shaft bearing；
The output end of the input terminal connection main shaft bearing temperature rise on-Line Monitor Device of the controller 14, connects for basis
The temperature rise signal output received controls voltage signal to hydraulic regulating device；
The hydraulic regulating device includes the hydraulic sliding sleeve 5 of 2 periphery of rear end main shaft bearing, is mounted on 5 periphery of hydraulic sliding sleeve
And the bullet for forming the rear end bearing seat 6 of closed annular hydraulic oil pocket 8 with hydraulic sliding sleeve 5, being mounted on preceding 11 left end of end bearing block
Preloading spring 3 in spring hole seat 4 and hole seat.Wherein, preloading spring 3 by compressed to hydraulic sliding sleeve 5 apply active force from
And give one initial pretightening force of main shaft bearing；Hydraulic sliding sleeve 5 and 2 outer ring of rear end main shaft bearing and rear end bearing seat 7 are all to meet
The clearance fit assembly that sliding requires；What is connect with 14 output end of controller is power amplifier 15；Connect with power amplifier 15
What is connect is hydraulic control system 16, and the oil outlet 26 of the hydraulic control system is connected with the annular hydraulic oil pocket 8.
The hydraulic regulating device is used to receive the control voltage signal of the output of controller 14, and passes through power amplifier 15
The electrohydraulic servo valve 21 of hydraulic control system 16 is controlled, and then controlling hydraulic control system oil outlet 26 is in annular hydraulic chamber 8
Pressure, and by pressure of 5 corrective action of hydraulic sliding sleeve on spring socket 4, final change acts on main shaft bearing outer ring
On bearing pre-fastening, guarantee that axis system has good temperature rise situation under different rotating speeds, to improve the longevity of axis system
Life.
In the initial stage, main shaft bearing F is given by preloading spring0Initial pretightening force.When machine tool chief axis starts running,
Under different rotating speeds, main shaft bearing temperature is monitored on-line, and sets a bearing temperature rise threshold value, once the bearing of monitoring
Temperature rise is more than threshold value, and controller 14 generates control instruction, and the valve core rotation of control 16 electrohydraulic servo valve 21 of hydraulic control system increases
The oil pressure of big oil outlet 26 to increase the pressure Δ P of annular hydraulic oil pocket 8, and then reduces and acts on main shaft bearing outer ring
Bearing pre-fastening so that pretightning force be F, F=F0-Δp·S；Bearing temperature rise gradually decreases, until the bearing temperature lower than setting
Rise temperature threshold.
Wherein, main shaft bearing temperature rise on-Line Monitor Device includes being mounted at the main shaft bearing of main shaft 1 front and back end four to be used for
Measure the temperature sensor 7 of main shaft bearing temperature rise and the data collector of the temperature rise signal for temperature sensor acquisition
13；The input terminal of data collector 13 connects temperature sensor 7, and output end connects the input terminal of controller 14.
By install preloading spring spring socket 4, by compression preloading spring 3 to hydraulic sliding sleeve 5 apply active force from
And given one initial pretightening force F of main shaft bearing0。
Hydraulic sliding sleeve 5 and rear end bearing seat 6 form closed annular hydraulic oil pocket 8, are radially evenly distributed, annular
Area of section is denoted as S.
Rear end bearing seat 6 offers the oil inlet passage penetrated through with annular hydraulic chamber 8, and oil inlet passage is equipped with fuel feed hole, should
Fuel feed hole is connected to the oil outlet 26 of hydraulic control system 16.
Hydraulic sliding sleeve 5 and 6 corresponding position of rear end bearing seat are equipped with threaded hole, and temperature sensor 7 is mounted on by threaded hole
At four main shaft bearings of main shaft front and back end.
When any one main shaft bearing temperature rise of acquisition is higher than the temperature threshold of setting, hydraulic control system 16 can be connect
Receive the instruction of the output of controller 14.The control instruction for often receiving the output of controller 14 is primary, the pressure of annular hydraulic oil pocket 8
With regard to increasing Δ p, and then reduce the bearing pre-fastening acted on main shaft bearing outer ring, so that pretightning force is F, F=F0-Δp·
S.With the reduction of bearing pre-fastening, bearing temperature rise is gradually decreased, until the temperature threshold lower than setting.
Using system of the present invention, adjusting method includes,
During the work time, the temperature sensor 7 at 1 front and back end main shaft bearing of main shaft will measure main shaft bearing temperature rise simulation
The step of signal；
Temperature analog signal is handled in being input to controller 14 through data collector 13, when the spindle shaft of acquisition
When holding temperature rise higher than temperature rise threshold value, controller 14 generates the step of control instruction exports；
The spool of 16 electrohydraulic servo valve 21 of hydraulic control system is controlled by power amplifier 15, and then controls annular hydraulic
The step of pressure of oil pocket 8；
Spring socket 4 is transferred the pressure to by hydraulic sliding sleeve 5, and then changes the bearing pre-tightened acted on bearing outer ring
The step of power improves the temperature characteristic of axis system, improves the bearing arrangement service life.
Specifically, as shown in Figure 1, a kind of machine tool mainshaft bearing pretightning force based on hydraulic control of the present invention automatically adjusts system
System includes main shaft bearing temperature rise on-Line Monitor Device, controller and hydraulic regulating device.
Main shaft bearing temperature rise on-Line Monitor Device includes temperature sensor 7, for the temperature of temperature sensor acquisition
The data collection system 13 of signal.Wherein, temperature sensor 7 is mounted on main shaft 1 front and back end four main shaft bearing by threaded hole
Place, for acquiring the real-time temperature rise signal of main shaft bearing；Data collection system 8 can locate main shaft bearing temperature rise signal in real time simultaneously
Reason, and be input in controller 14.
Controller 14 is used for the main shaft bearing temperature rise signal obtained according to data collection system 13, output control hydraulic pressure signal
To hydraulic regulating device.
Hydraulic regulating device include the hydraulic sliding sleeve 5 of 2 periphery of rear end main shaft bearing, be mounted on 5 periphery of hydraulic sliding sleeve and with
The spring eye of 11 left end of end bearing block before hydraulic sliding sleeve 5 forms the rear end bearing seat 6 of closed annular hydraulic oil pocket 8, is mounted on
Preloading spring 3 on seat 4 and hole seat.Wherein, preloading spring 3 by compressed to hydraulic sliding sleeve 5 apply active force to
One initial pretightening force of main shaft bearing；The outer ring and rear end bearing seat 6 of hydraulic sliding sleeve 5 and rear end main shaft bearing 2 are all to meet to slide
Dynamic desired clearance fit assembly；What is connect with 14 output end of controller is power amplifier 15；It is connect with power amplifier 15
Be hydraulic control system 16, be connected inside the oil outlet 26 of the hydraulic control system and the annular hydraulic oil pocket 8.
It is illustrated in figure 2 the basic principle schematic diagram of hydraulic control system.When hydraulic control system is started to work, motor 18
Rotation drives the hydraulic oil in fuel tank 29 to enter oil circuit, and passes through filter 19 and check valve 20, electrohydraulic servo valve 21 and ratio
Overflow valve 22 controls the oil pressure size at oil outlet 26, the oil pressure of 25 real-time monitoring oil outlet 26 of pressure gauge and by data feedback
To electrohydraulic servo valve 21 and pressure retaining valve 24.When the pressure of oil outlet is met the requirements, pressure retaining valve 24 is opened, and passes through accumulator 23
Guarantee that the pressure of oil outlet is stablized in steady state value.
Method of the present invention, during operation, preloading spring 3 act on 5 application of hydraulic sliding sleeve by being compressed
Power is to give one initial pretightening force F of main shaft bearing0, the temperature sensor 7 at the main shaft bearing of main shaft 1 front and back end four will measure
Main shaft bearing temperature analog signal through data collection system 13, be input in controller 14 and handled, when the main shaft measured
When bearing temperature is higher than temperature threshold, controller 14 generates control instruction output, and control instruction is controlled by power amplifier 15
The valve core rotation of 16 electrohydraulic servo valve 21 of hydraulic control system increases the oil pressure of oil outlet 26, to increase annular hydraulic oil pocket 8
Pressure, the pressure of annular hydraulic oil pocket 8 is transmitted to by spring socket 4 by hydraulic sliding sleeve 5, and then reduce and act on spindle shaft
Bearing pre-fastening on bearing outer-ring；The control instruction for often receiving the output of controller 14 is primary, and the pressure of annular hydraulic oil pocket 8 is just
Increase Δ p, it is assumed that the sectional area of annular hydraulic oil pocket is S, then every reception once command, bearing pre-fastening reduction amount is Δ
p·S.With the reduction of bearing pre-fastening, bearing temperature rise is gradually decreased, until the temperature threshold lower than setting.
Claims (10)
1. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control, including main shaft bearing temperature rise are supervised online
Survey device, controller (14) and hydraulic regulating device；It is characterized in that,
The main shaft bearing temperature rise on-Line Monitor Device for acquiring the temperature rise signal of main shaft bearing in real time；
The hydraulic regulating device includes hydraulic sliding sleeve (5) of the setting in rear end main shaft bearing (2) periphery, is mounted on hydraulic cunning
It covers (5) periphery and forms the rear end bearing seat (6) of closed annular hydraulic oil pocket (8) with hydraulic sliding sleeve (5), be arranged in front end master
The preceding end bearing block (11) of axle bearing periphery is fixed on the spring socket (4) of preceding end bearing block (11) rear end, is arranged in spring eye
Preloading spring (3) in seat (4), the hydraulic control system (16) being connected to annular hydraulic oil pocket (8)；
The controller (14) connects hydraulic control system (16) control terminal by power amplifier (15)；Controller (14)
Input terminal connects the temperature rise signal of main shaft bearing temperature rise on-Line Monitor Device output；
Preloading spring (3) is connect after being compressed with hydraulic sliding sleeve (5) front end, applies initial pretightening force to main shaft bearing；Work as control
When device (14) receives bearing temperature rise threshold value of the bearing temperature rise in temperature rise signal more than setting, controller (14) controls hydraulic control
System (16) processed increases the output of hydraulic oil power, to increase the pressure of annular hydraulic oil pocket (8), by hydraulic sliding sleeve (5) by ring
The pressure of shape hydraulic fluid chamber (8) is transmitted to spring socket (4), and then reduces the bearing pre-tightened acted on main shaft bearing outer ring
Power, until bearing temperature rise threshold value of the bearing temperature rise lower than setting.
2. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, the main shaft bearing temperature rise on-Line Monitor Device includes data collector (13) and temperature sensor (7)；Temperature
The corresponding each main shaft bearing setting of sensor (7), for acquiring the temperature rise signal of corresponding main shaft bearing in real time；Data collector
(13) input terminal connects all temperature sensors (7), and output end connects controller (14) input terminal.
3. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 2,
It is characterized in that, is respectively equipped with screw thread on hydraulic sliding sleeve (5) and the corresponding position of rear end bearing seat (6) and preceding end bearing block (11)
Hole, temperature sensor (7) are mounted on corresponding main shaft bearing by threaded hole.
4. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, the spring socket (4) is annularly arranged, and is evenly arranged with multiple preloading springs (3) on spring socket (4).
5. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, there are four the main shaft bearing is arranged altogether, is divided into two groups of front and back, every group of two main shaft bearings are matched in series connection
It sets, is in back-to-back configuration between two groups；The inside of preceding end bearing block (11) and the rear end outer ring of front end main shaft bearing are clamped；It is hydraulic
The inside and rear end main shaft bearing (2) front end outer ring of sliding sleeve (5) are clamped.
6. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, the inner ring of main shaft bearing is positioned by being set in positioning ring on main shaft (1) respectively, and the front end of preceding end bearing block (11) is set
It sets fixed drive end bearing bracket (12), the fixed rear end cap (9) of the rear end setting of rear end bearing seat (6).
7. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, is provided on the contact surface of hydraulic sliding sleeve (5) and rear end bearing seat (6) for annular hydraulic oil pocket (8) sealing
Hydraulic sealing ring (17).
8. a kind of machine tool mainshaft bearing pretightning force automatic regulating system based on hydraulic control according to claim 1,
It is characterized in that, the hydraulic control system (16) includes fuel tank (29), is connected to the motor of fuel tank (29) oil outlet in turn
(18), filter (19) and check valve (20) and oil outlet (26)；Check valve (20) output end one are successively through electro-hydraulic servo
Valve (21) and proportional pressure control valve (22) connection oil outlet (26), another connects oil outlet (26) through pressure retaining valve (24)；Oil outlet
(26) fuel tank oil inlet end is connected through cooler (27) and flowmeter (28)；Pressure retaining valve (24) connects oil outlet (26) side setting pressure
Accumulator (23) are arranged in power table (25), the other side.
9. a kind of machine tool mainshaft bearing pretightning force Automatic adjustment method based on hydraulic control, which is characterized in that wanted based on right
Automatic regulating system described in 1-8 any one is sought, is included the following steps,
Step 1, believed by the way that the temperature rise simulation of temperature sensor detection main shaft bearing (2) at the main shaft bearing of front and back end is arranged in
Number；
Step 2, temperature analog signal is through data collector (13), then is input in controller (14) and is handled, when acquisition
When the temperature rise of any one main shaft bearing is higher than setting temperature rise threshold value, controller (14) generates control instruction output；
Step 3, the valve that control instruction passes through the electrohydraulic servo valve (21) of power amplifier (15) control hydraulic control system (16)
Core rotation increases the oil pressure of oil outlet (26), to increase the pressure of annular hydraulic oil pocket (8)；
Step 4, the pressure of annular hydraulic oil pocket (8) is transmitted to spring socket (4) by hydraulic sliding sleeve (5), and then reduces and makees
With the bearing pre-fastening on main shaft bearing outer ring；
Step 5, the control instruction for often receiving controller (14) output is primary, and the pressure of annular hydraulic oil pocket (8) just increases Δ
P repeats step 1-4, and bearing temperature rise gradually decreases, until the bearing temperature rise temperature threshold lower than setting, controller (14) control
Hydraulic control system (16) keeps current oil pressure to stablize.
10. a kind of machine tool mainshaft bearing pretightning force Automatic adjustment method based on hydraulic control according to claim 9,
It is characterized in that, when hydraulic control system (16) start to work, motor (18) rotation drives the hydraulic oil in fuel tank (29) to enter
Oil circuit, and exported by filter (19) and check valve (20), electrohydraulic servo valve (21) and proportional pressure control valve (22) control
Oil pressure size at hydraulic fluid port (26), the oil pressure of pressure gauge (25) real-time monitoring oil outlet (26) and by data feedback to electro-hydraulic servo
Valve (21)；When the pressure of oil outlet (26) is met the requirements, pressure retaining valve (24) is opened, and guarantees oil outlet by accumulator (23)
Pressure stablize in steady state value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611170299.0A CN106670510B (en) | 2016-12-16 | 2016-12-16 | A kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control |
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| CN201611170299.0A CN106670510B (en) | 2016-12-16 | 2016-12-16 | A kind of machine tool mainshaft bearing pretightning force automatic regulating system and method based on hydraulic control |
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|---|---|---|---|---|
| CN107262745A (en) * | 2017-06-30 | 2017-10-20 | 河北工业大学 | The dynamic adjusting device and dynamic adjusting method of a kind of machine tool mainshaft bearing pretightning force |
| CN107738084B (en) * | 2017-10-09 | 2024-02-27 | 广州市昊志机电股份有限公司 | Device and main shaft of adjustment bearing play |
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| CN115622478B (en) * | 2022-12-20 | 2023-02-24 | 天津飞旋科技股份有限公司 | Method for controlling pre-tightening force of motor bearing |
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