Energy-saving double-motor double-station screw press

Patent metadata

Field	Value
Publication number	US-11214029-B2
Application number	US-202016799754-A
Country	US
Kind code	B2
Filing date	Feb 24, 2020
Priority date	Apr 12, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

Disclosed is a double-motor double-station screw press, comprising two sets of screw pair mechanisms on both sides thereof, i.e., first and second screw pair mechanisms, where in the first screw pair mechanism, a first lead screw is driven by a resultant movement synthesized by first and second motors through a first differential gear train; in the second screw pair mechanism, a second lead screw is driven by a resultant movement synthesized by the first and second motors through a second differential gear train; a first slider and a second slider in the press work symmetrically; a transmission mode between the second motor and the second differential gear train is switched by controlling a steering switching apparatus, such that the second motor can assist the first motor during a single-cylinder pressing process to increase the output pressure, but also it is convenient to adjust a relative positions of two cylinders.

First claim

What is claimed is:

1. An energy-saving double-motor double-station screw press, wherein:
two sets of screw pair mechanisms are respectively arranged on both sides of the press, where a first screw pair mechanism comprises a first cylinder ( 7 a ), a first lead screw ( 6 a ), a first slider ( 8 a ), and a first anti-rotation apparatus ( 10 a ), and a second screw pair mechanism comprises a second cylinder ( 7 b ), a second lead screw ( 6 b ), a second slider ( 8 b ), and a second anti-rotation apparatus ( 10 b ); a first differential gear train is formed by a first bevel gear ( 4 a ), a second bevel gear ( 4 b ), a third bevel gear ( 4 c ), and a first turning arm ( 3 a ), the first differential gear train takes the third bevel gear ( 4 c ) and the first turning arm ( 3 a ) as input ends and the first bevel gear ( 4 a ) as an output end; and a second differential gear train is formed by a sixth bevel gear ( 4 b ), a seventh bevel gear ( 4 g ), an eighth bevel gear ( 4 h ) and a second turning arm ( 3 b ), the second differential gear train takes the eighth bevel gear ( 4 h ) and the second turning arm ( 3 b ) as input ends and the sixth bevel gear ( 40 as an output end;
the first lead screw ( 6 a ) is driven by a resultant movement which is synthesized by a first motor ( 1 a ) and a second motor ( 1 b ) through the first differential gear train; the second lead screw ( 6 b ) is driven by a resultant movement which is synthesized by the first motor ( 1 a ) and the second motor ( 1 b ) through the second differential gear train; a steering switching apparatus is provided between the second motor ( 1 b ) and the second differential gear train, so that the steering switching apparatus drives the eighth bevel gear ( 4 h ) in the second differential gear train to switch between two different rotation directions, under the condition that a rotation direction of the second motor ( 1 b ) is not changed;
a first displacement sensor ( 11 a ) and a second displacement sensor (lib) respectively detect and obtain displacements and speeds of the first slider ( 8 a ) and the second slider ( 8 b ), and transmit the obtained information to a control system ( 13 ); a first pressure sensor ( 9 a ) and a second pressure sensor ( 9 b ) respectively detect and obtain a pressure of the first slider ( 8 a ) and the second slider ( 8 b ) in a pressing process, and transmit this pressure information to the control system ( 13 ); the control system ( 13 ) controls the first motor ( 1 a ) and the second motor ( 1 b ) respectively through a first servo driver ( 12 a ) and a second servo driver ( 12 b ), and receives a motor feedback signal; and the first motor ( 1 a ) and the second motor ( 1 b ) are both servo motors.

2. The energy-saving double-motor double-station screw press according to claim 1 , wherein:
the first motor ( 1 a ) is directly connected to the first gear ( 2 a ); the first gear ( 2 a ) drives the first turning arm ( 3 a ) to rotate; the second motor ( 1 b ) is directly connected to a second gear ( 2 b ); the second gear ( 2 b ) is engaged with a third gear ( 2 c ); the third gear ( 2 c ) is coaxial with a fifth bevel gear ( 4 e ); the fifth bevel gear ( 4 e ) drives the third bevel gear ( 4 c ) to rotate through a fourth bevel gear ( 4 d ); inputs of the third bevel gear ( 4 c ) and the first turning arm ( 3 a ) are combined into an output of the first bevel gear ( 4 a ) through the first differential gear train, the first bevel gear ( 4 a ) is coaxial with the first lead screw ( 6 a ), a rotation movement of the first lead screw ( 6 a ) is converted into an up-and-down linear movement of the first slider ( 8 a ) through the first screw pair mechanism; simultaneously, the first turning arm ( 3 a ) drives the second turning arm ( 3 b ) to rotate; the steering switching apparatus is provided with a tenth bevel gear ( 4 j ) and an eleventh bevel gear ( 4 k ) coaxially with the third gear ( 2 c ), and a first clutch ( 5 a ) is provided between the third gear ( 2 c ) and the tenth bevel gear ( 4 j ), and a second clutch ( 5 b ) is provided between the third gear ( 2 c ) and the eleventh bevel gear ( 4 k ); the tenth bevel gear ( 4 j ) and the eleventh bevel gear ( 4 k ) are engaged with a ninth bevel gear ( 4 i ) at different positions; when the first clutch ( 5 a ) is engaged and the second clutch ( 5 b ) is disengaged, the third gear ( 2 c ) drives the ninth bevel gear ( 4 i ) to rotate through the tenth bevel gear ( 4 j ); when the first clutch ( 5 a ) is disengaged and the second clutch ( 5 b ) is engaged, the third gear ( 2 c ) drives the ninth bevel gear ( 4 i ) to rotate through the eleventh bevel gear ( 4 k ), the ninth bevel gear ( 4 i ) drives the eighth bevel gear ( 4 h ) to rotate, inputs of the eighth bevel gear ( 4 h ) and the second turning arm ( 3 b ) are combined into an output of the sixth bevel gear ( 40 through the second differential gear train, the sixth bevel gear ( 40 is coaxial with the second screw ( 6 b ), and a rotation movement of the second lead screw ( 6 b ) is converted into an up-and-down linear movement of the second slider ( 8 b ) through the second screw pair mechanism.

3. The energy-saving double-motor double-station screw press according to claim 2 , wherein:
an initial position is set according to the following process:
Step 1: moving the second slider ( 8 b ) to a limit position A by working of the first motor ( 1 a ), and the second motor ( 1 b ) being not working;
Step 2: keeping the first motor ( 1 a ) working, making the second motor ( 1 b ) work simultaneously, the first clutch ( 5 a ) being disengaged and the second clutch ( 5 b ) being engaged, and formula (1) being satisfied, so that the second slider ( 8 b ) is kept at the limit position A and does not move, and the first slider ( 8 a ) moves towards a limit position B, and the first motor ( 1 a ) and the second motor ( 1 b ) stop working when the first slider ( 8 a ) reaches the limit position B, to complete setting of the initial position; the limit positions A and B are different limit positions:

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Assignees

• Univ Hefei Technology

Inventors

• Huang Haihong
• Jin Rui
• Li Lei
• Fang Bo
• Liu Zhifeng

Classifications

• B30B1/186 Primary

  Control arrangements · CPC title

• B30B1/18 Primary

  by screw means {(B30B9/3064 takes precedence)} · CPC title