CN114801278A - Intelligent press machine transmission efficiency monitoring system and method - Google Patents
Intelligent press machine transmission efficiency monitoring system and method Download PDFInfo
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- CN114801278A CN114801278A CN202210462987.3A CN202210462987A CN114801278A CN 114801278 A CN114801278 A CN 114801278A CN 202210462987 A CN202210462987 A CN 202210462987A CN 114801278 A CN114801278 A CN 114801278A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 45
- 238000012544 monitoring process Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001133 acceleration Effects 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
- B30B1/181—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means the screw being directly driven by an electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0094—Press load monitoring means
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- Mechanical Engineering (AREA)
- Control Of Presses (AREA)
Abstract
The invention discloses an intelligent press machine transmission efficiency monitoring system and method, comprising an angular velocity sensor, a roller screw and a controller, wherein the angular velocity sensor is used for monitoring the angular velocity of the roller screw; the force sensor is used for monitoring the load force of the nut; the angular acceleration sensor is used for monitoring the angular acceleration of the roller screw; and the control panel is used for calculating the instantaneous transmission efficiency of the roller screw. Each monitoring value of the sensor is conveyed to the control panel, the transmission efficiency of the intelligent press is obtained through analysis and calculation of the control panel, the calculation result is displayed on the panel, and when the transmission efficiency of the intelligent press is lower than a set value, the device can give an alarm to prompt a worker to maintain the transmission mechanism. The invention applies the planet roller screw to the press machine equipment, and the intelligent press machine equipment has the advantages of small volume, high precision, large load capacity and the like according to the meshing characteristics of the planet roller screw.
Description
Technical Field
The invention belongs to the field of press machine monitoring, and particularly relates to an intelligent press machine transmission efficiency monitoring system and method.
Background
The types of the press machines commonly used at home and abroad at present are as follows: pneumatic presses, screw presses, crank presses, hydraulic presses, and the like. Although these presses can reach a large upper pressure limit, there are many disadvantages, such as: the control precision of the applied pressure is not high, when the high-pressure force is large, the space size of the whole press is large, the running speed of the pressing plate is not high, and the like. In many cases, the requirements of intelligent equipment on light weight, high precision, high efficiency and the like cannot be met.
Disclosure of Invention
The invention aims to provide an intelligent monitoring system and method for the transmission efficiency of a press machine, which are used for detecting the transmission efficiency of the press machine in real time.
The technical solution for realizing the purpose of the invention is as follows:
an intelligent press transmission efficiency monitoring system, comprising:
angular velocity sensor for monitoring angular velocity of ball screw
Force sensor for monitoring the load force F of the nut N ；
Angular acceleration sensor for monitoring angular acceleration of ball screw
The control panel is used for calculating the instantaneous transmission efficiency of the ball screw:
wherein n is s Number of lead screw heads, p s Is the screw pitch of the screw, M s Torque is input to the screw shaft.
A monitoring method for transmission efficiency of an intelligent press is obtained by the following calculation:
wherein n is s Number of lead screw heads, p s Is the screw pitch of the screw, M s Torque is input to the screw shaft.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the planetary roller screw is applied to the press machine equipment, and under the condition of the same loading force, the volume of the whole equipment is greatly reduced;
(2) after the press machine uses the transmission mechanism of the planet roller screw, the action frequency and the equipment efficiency are greatly improved;
(3) the transmission mechanism is driven by a servo motor, and has high control precision on the loading force, the loading distance and the like of equipment;
(4) when the transmission efficiency of the press machine equipment is lower than a set value, the equipment can send an alarm to remind a worker to maintain the transmission component of the equipment.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the intelligent press machine.
Fig. 2 is a schematic diagram of parts in the transmission efficiency real-time monitoring method provided by the invention.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
With reference to fig. 1-2, the system and method for monitoring the transmission efficiency of the intelligent press apply a planetary roller screw to the intelligent press, and the monitoring system includes an equipment base 1, a support column 2, a press plate 3, a planetary roller screw 4, a coupling 5, a driving motor 6 and a control panel 7; wherein planet roller lead screw 4 specifically includes: support 8, angular velocity sensor 9, nut 10, force sensor 11, lead screw 12, support 13, angular acceleration sensor 14. Wherein, the angular velocity sensor 9 is arranged on the side surface of the support 8 and is used for monitoring the angular velocity of the lead screw; the effective monitoring surface of the force sensor 11 is arranged on the end surface of the nut 10 and is used for monitoring the load force of the nut 10; an angular acceleration sensor 14 is mounted to the side of the support 13 for monitoring the angular acceleration of the screw.
According to the invention, a nut 10 of a planetary roller screw is arranged on a pressure plate 3 through a flange, when a driving motor 6 works, a screw 12 is driven to rotate through a coupler 5, the rotary motion of the screw 12 is converted into the up-and-down linear motion of the nut 10 through the planetary roller screw 4, and the nut 10 drives the pressure plate 3 to move up and down linearly, so that the function of a press machine is realized.
The invention provides a basic principle of an instantaneous transmission efficiency real-time monitoring method, which comprises the following steps: the driving motor 6 transmits driving torque to the screw 12 through the coupling 5, and then angular velocity of the screw is respectively obtained through the angular velocity sensor 9, the angular acceleration sensor 14 and the force sensor 11
Angular acceleration
Nut load F N And sends each value to the control panel 7 of the intelligent device. An instantaneous transmission efficiency calculation module of the planetary roller screw is arranged in the control panel 7, and the efficiency of the equipment can be obtained through the software calculation module. Basic work flow: when the equipment works, the angular speed of the planetary roller screw is obtained through each sensor
Angular acceleration
Nut load F N The detection result is fed back to the control panel 7, so that the instantaneous transmission efficiency of the planetary roller screw, that is, the efficiency of the apparatus in consideration of the transmission mechanism, can be obtained. In the working process of the equipment, the efficiency of the equipment is reduced due to the reasons of abrasion of parts of a transmission mechanism, large load change, failure of lubrication in long-time working and the like, and when the efficiency is lower than a certain set value, the alarm device gives an alarm to remind related personnel. On the one hand, the safety of the equipment can be improved, on the other hand, the working personnel can be reminded to maintain the equipment in time, and the service life of the intelligent equipment is prolonged from the side surface.
The following is a basic derivation step (symbol meaning refers to symbol table) for deriving a motion differential equation of the planetary roller screw based on a Lagrange equation so as to calculate the transmission efficiency:
the Lagrangian equation, which we know of a general complete system, can be expressed as
Wherein q is j The generalized coordinate position of system particle;
the generalized velocity of mass point; t is system kinetic energy; q j T represents time, and is the generalized force or the generalized moment applied to the system particles.
The control panel 7 is provided with:
the total kinetic energy calculating unit is used for calculating the total kinetic energy in the motion process of the roller screw;
the first moment calculating unit is used for calculating the generalized moment borne by the roller screw;
the second moment calculation unit is used for calculating the generalized moment borne by the roller inside the roller screw;
a screw shaft input torque calculation unit for calculating a screw shaft input torque according to a relationship between the screw shaft input torque and the parameter monitored by the sensor;
and the instantaneous transmission efficiency calculating unit is used for calculating the instantaneous transmission efficiency of the roller screw according to the transmission efficiency calculating formula.
The total kinetic energy calculating unit can calculate the total kinetic energy T in the motion process of the planetary roller screw according to the meshing characteristics of the planetary roller screw and can represent the total kinetic energy T as
The first moment calculating unit can calculate the generalized moment applied to the screw rod as
The second moment calculating unit is used for calculating the generalized moment borne by the roller between the internal structures of the planetary roller screw and can be expressed as
The process of calculating the input torque of the screw shaft by the screw shaft input torque calculating unit is as follows:
from equation (2), it can be calculated
Substituting the formulas (3) to (8) into the formula (1) to obtain the final product
The formulas (9) and (10) can be simplified into
Wherein the content of the first and second substances,
the instantaneous transmission efficiency calculating unit calculates the instantaneous transmission efficiency of the ball screw:
since the transmission efficiency at any time in the system is equal to the ratio of the output power to the input power, the transmission efficiency η of the planetary roller screw at any time can be expressed as
Example (c): the basic structural parameters of a certain planetary roller screw are known as follows:
basic structure size parameter table of planetary roller screw
The numerical value of each structure dimension is substituted into the formula (11), so that the motion differential equation of the planetary roller screw can be obtained as follows
When the equipment is in operation, the angular acceleration can be obtained by the sensor
Angular velocity
Nut load F N By substituting the data of (2) into the equation (11), the input torque M can be calculated s Will input M s The torque is substituted into the formula (12), and the transmission efficiency of the planetary roller screw is obtained.
Claims (8)
1. An intelligent monitoring system for transmission efficiency of a press machine is characterized by comprising:
angular velocity sensor for monitoring angular velocity of roller screw
Force sensor for monitoring the load force F of the nut N ：
Angular acceleration sensor for monitoring angular acceleration of roller screw
A control panel for calculating the instantaneous transmission efficiency of the planetary roller screw:
wherein n is s Number of lead screw heads, p s Is the screw pitch of the screw, M s Torque is input to the screw shaft.
2. The intelligent press transmission efficiency monitoring system according to claim 1, wherein the control panel is provided with:
the total kinetic energy calculating unit is used for calculating the total kinetic energy in the motion process of the roller screw;
the first moment calculating unit is used for calculating the generalized moment borne by the roller screw;
the second moment calculating unit is used for calculating the generalized moment borne by the roller in the roller screw;
a screw shaft input torque calculation unit for calculating a screw shaft input torque according to a relationship between the screw shaft input torque and the parameter monitored by the sensor;
and the instantaneous transmission efficiency calculating unit is used for calculating the instantaneous transmission efficiency of the roller screw according to the transmission efficiency calculating formula.
3. The system for monitoring the transmission efficiency of the intelligent press according to claim 2, wherein the total kinetic energy calculating unit calculates the total kinetic energy in the roller screw motion process as follows:
wherein p is s Is the screw pitch of the screw rod, m n For equivalent nut mass, n r Number of roller heads, m r Is the mass of the roller, m b Cage mass, J s Is the moment of inertia of the screw, r r Is the pitch radius of the roller, r s Is the pitch radius of the screw, J b Is the moment of inertia of the cage, n s Number of lead screw heads, J r The moment of inertia of the axis of the roller,
the revolution angular velocity of the roller.
4. The system for monitoring the transmission efficiency of the intelligent press according to claim 2, wherein the first torque calculation unit calculates the generalized torque applied to the roller screw as follows:
wherein M is s For input of moment, n, to the screw shaft r The number of roller heads, mu is the friction coefficient of the contact surface of the screw rod and the roller, r s Is the pitch radius of the screw, p s Is the pitch of the lead screw, r r Is the pitch radius of the roller.
5. The system for monitoring the transmission efficiency of the intelligent press according to claim 2, wherein the second torque calculation unit calculates the generalized torque applied to the roller inside the roller screw as follows:
wherein n is r The number of roller heads, mu is the friction coefficient of the contact surface of the screw rod and the roller, r s Is the pitch radius of the screw, n s Number of lead screw heads, r s Is the pitch radius of the screw, n r The number of roller heads.
6. The system for monitoring the transmission efficiency of the intelligent press machine according to claim 2, wherein the screw shaft input torque calculation unit calculates the screw shaft input torque to satisfy the following formula:
wherein
Wherein p is s Is the screw pitch of the screw rod, m n For equivalent nut mass, n r Number of roller heads, m r Is the mass of the roller, m b Cage mass, J s Is the moment of inertia of the screw, r r Is the pitch radius of the roller, r s Is the pitch radius of the screw, J b Mu is the contact surface friction coefficient of the screw rod and the roller and n is the rotational inertia of the retainer s Number of lead screw heads, J r Roller axis rotationThe moment of inertia is changed,
the revolution angular velocity of the roller.
7. The monitoring method for the transmission efficiency of the intelligent press is characterized by being obtained by calculating according to the following formula:
wherein n is s Number of lead screw heads, p s Is the screw pitch of the screw, M s Torque is input to the screw shaft.
8. The intelligent monitoring method for the transmission efficiency of the press machine according to claim 7,
wherein the screw shaft inputs the moment M s Satisfies the following formula:
wherein
Wherein p is s Is the screw pitch of the screw rod, m n For equivalent nut mass, n r Number of roller heads, m r Is the roller mass, m b Cage mass, J s Is the moment of inertia of the screw, r r Is the pitch radius of the roller, r s Is the pitch radius of the screw, J b Mu is the contact surface friction coefficient of the screw rod and the roller and n is the rotational inertia of the retainer s Number of lead screw heads, J r The moment of inertia of the axis of the roller,
the revolution angular velocity of the roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210462987.3A CN114801278A (en) | 2022-04-28 | 2022-04-28 | Intelligent press machine transmission efficiency monitoring system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210462987.3A CN114801278A (en) | 2022-04-28 | 2022-04-28 | Intelligent press machine transmission efficiency monitoring system and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010024584A1 (en) * | 2010-06-22 | 2011-12-22 | Schaeffler Technologies Gmbh & Co. Kg | Drive device for press, has linear drive roller that is attached to plunger of press, and planetary linear drive roller formed on linear drive roller is directly connected with rotor of electromotor |
| CN112016196A (en) * | 2020-08-11 | 2020-12-01 | 西北工业大学 | Double-nut planetary roller screw dynamics research method based on elastic deformation |
| CN113340594A (en) * | 2021-06-23 | 2021-09-03 | 东北林业大学 | Fatigue life testing device and method for heavy-load planetary roller screw |
| CN114139294A (en) * | 2021-08-31 | 2022-03-04 | 北京精密机电控制设备研究所 | Method for calculating transmission efficiency of planetary roller screw pair |
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2022
- 2022-04-28 CN CN202210462987.3A patent/CN114801278A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010024584A1 (en) * | 2010-06-22 | 2011-12-22 | Schaeffler Technologies Gmbh & Co. Kg | Drive device for press, has linear drive roller that is attached to plunger of press, and planetary linear drive roller formed on linear drive roller is directly connected with rotor of electromotor |
| CN112016196A (en) * | 2020-08-11 | 2020-12-01 | 西北工业大学 | Double-nut planetary roller screw dynamics research method based on elastic deformation |
| CN113340594A (en) * | 2021-06-23 | 2021-09-03 | 东北林业大学 | Fatigue life testing device and method for heavy-load planetary roller screw |
| CN114139294A (en) * | 2021-08-31 | 2022-03-04 | 北京精密机电控制设备研究所 | Method for calculating transmission efficiency of planetary roller screw pair |
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