CN200980019Y

CN200980019Y - An electrically driven cylinder controlled and served by the straight movement of a piston rod

Info

Publication number: CN200980019Y
Application number: CN 200620111544
Authority: CN
Inventors: 沈杰; 廖长兵; 沈应彬
Original assignee: CHONGQING HAITONG MACHINERY MANUFACTURE Co Ltd
Current assignee: CHONGQING HAITONG MACHINERY MANUFACTURE Co Ltd
Priority date: 2006-10-18
Filing date: 2006-10-18
Publication date: 2007-11-21
Anticipated expiration: 2016-10-18

Abstract

A piston-rod linear motion control-and-servo electric cylinder comprises a cylinder (1) and arranges a second lead screw which comprises a lead screw (3) and a screw nut (4) in the cylinder (1), wherein the cylinder (1) is equipped with a piston rod (2) with a tubular structure inside, and one end of the piston rod (2) is connected with the screw nut (4) by a bolt (20) via a flange (10) and a middle block (11), while the piston rod (2) is locked equipped with a spring collar (12) to axial fixed connect with the middle block (11). One end of the lead screw (3) inserts into the piston rod (2) and is connected with a buffer device, while another end is directly or indirectly connected with an output end of a servo-motor (5). The utility model converts the rotary motion of the servo-motor to the linear motion of the piston rod via the second lead screw, and compared with prior control device with air-pressure or fluid-pressure structure, the utility model reduces a plurality of inertias and slacks of intermediate links, thereby making the structure more compact and improving control accuracy, and also making assembling, using and maintaining more convenient.

Description

Piston rod rectilinear motion control servo electric jar

Technical field

The utility model relates to motion control device, relates in particular to the device that the rectilinear motion of piston rod is controlled.

Background technology

At present, traditional piston rod rectilinear motion control device is generally hydraulic pressure or pneumatic structure, mainly is made of power source (hydraulic power unit, air compressor machine etc.), control valve platform, actuator's (oil cylinder, cylinder) and auxiliary.By prime mover electric energy is changed into hydraulic pressure energy or pressure energy, change into the mechanical energy of piston rod motion again by control, adjusting and actuator (oil cylinder, cylinder etc.), the motion that promptly comes the control piston bar by hydraulic pressure or air pressure.This device is owing to adopt liquid or gas to come transferring power, and the energy loss in the transmission process is bigger, and liquid or gas in the cylinder body easily leak, and pollutes the work-yard, thereby has limited its range of application; Liquid or gas are subjected to variations in temperature bigger at work, cause the variation of whole device kinetic characteristic easily, thereby influence the robust motion and the accuracy of actuator.

The utility model content

Problem to be solved in the utility model provides a kind of control steadily, accurately and reliably, and the piston rod rectilinear motion of compact conformation control servo electric jar.

For solving the problems of the technologies described above, piston rod rectilinear motion control servo electric jar of the present utility model, have cylinder barrel and piston rod, piston rod is positioned at cylinder barrel, is provided with the screw pair that is made of screw mandrel and nut in the cylinder barrel, and piston rod is a tubular structure, one end of piston rod links to each other with the nut on the screw pair, the other end links to each other with the cylinder barrel gudgeon that is connected outward, and screw mandrel one end stretches in the piston rod, and the other end links to each other with the output shaft of servomotor by belt pulley or shaft coupling.

Owing between piston rod in cylinder barrel and the servomotor screw pair is arranged, watch rotatablely moving of motor and be converted into the rectilinear motion of piston rod by screw pair, the displacement that sensor feedback screw mandrel on the servomotor rotates, compare with the control device of conventional hydraulic or pneumatic structure, the inertia and the gap of a lot of intermediate links have been reduced, more compact structure has improved control precision and control stability, installs, uses and keep in repair also more convenient.

As preference, above-mentioned piston rod is connected with bolt by ring flange and intermediate mass with nut, be installed with check ring on the piston rod intermediate mass is carried out axial limiting, this syndeton both guaranteed between piston rod and the nut be connected reliable, guarantee between them not constrained each other on gyratory directions again, thereby when piston rod movement behind extreme position, screw mandrel is not if piston rod can prevent to damage motor along with screw pair rotates together when being rotated further.

As another preference, the end that above-mentioned screw mandrel is positioned at piston rod is connected with buffer unit, this buffer unit is made of left and right cushion pad, buffer and buffer pad head, link to each other by bearing pin between left and right cushion pad and the piston rod, connecting hole on the left and right cushion pad is bar hole, the buffer pad head thread is connected on the right cushion pad, and buffer is threaded with left cushion pad.When piston rod turnover cylinder head arrived near extreme position, above-mentioned buffer unit began to work, and buffer is similar to the damping shock absorption structure, and the bar hole structure on left and right cushion pad realizes the composite buffering cushioning effect.

As improvement to above-mentioned buffer unit, above-mentioned left cushion pad outer surface is arranged with two grooves of axial perforation, the bar shaped connecting hole is arranged on the bottom of groove, there are two to connect pawls and match on the right cushion pad with groove on the left cushion pad, bar shaped connecting hole on the right cushion pad is arranged on this connection pawl, this compact conformation can make left and right cushion pad realize that under the identical situation of external diameter bar hole connects.

The beneficial effects of the utility model are: compare with the control device of conventional hydraulic or pneumatic structure, reduced the inertia and the gap of a lot of intermediate links, more compact structure has improved control precision and control stability, installs, uses and keep in repair also more convenient

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Fig. 3 is left and right cushion pad 13 and 15 a matching relationship schematic cross-section in the utility model.

Fig. 4 is an electric control schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, piston rod rectilinear motion control servo electric jar of the present utility model is provided with the screw pair that is made of screw mandrel 3 and nut 4 in cylinder barrel 1, piston rod 2 is a tubular structure, piston rod 2 is positioned at cylinder barrel 1, and the one end links to each other with nut 4, and the other end links to each other with cylinder barrel 1 gudgeon 19 that is connected outward; Screw mandrel 3 one ends stretch in the piston rod 2, and the other end links to each other with the output of servomotor 5 by big belt pulley 6, small belt pulley 7 and belt 8, and screw mandrel 3 also can or directly link to each other with the output of servomotor 5 by shaft coupling.The screw pair that is provided with in cylinder barrel 1 is converted into rotatablely moving of servomotor 5 rectilinear motion of piston rod 2, just can realize the straight-line displacement control of piston rod by the accurately control that rotatablely moves servomotor 5 output shafts, compare with the piston rod rectilinear motion control device of conventional hydraulic or pneumatic structure, many intermediate links have been reduced, more compact structure, it is more accurate, stable to control.Label 9 is a ball bearing among Fig. 1, and 17 is the rear end cap of

cylinder barrel

1, and 18 is sliding bearing.

Fig. 1, Fig. 2 illustrate piston rod 2 and are connected by ring flange 10 and intermediate mass 11 usefulness bolts 20 with nut 4, be installed with 12 pairs of intermediate mass of check ring 11 on the piston rod 2 and carry out axial limiting, this structure both guaranteed between piston rod 2 and the ball nut 4 be connected reliable, guarantee between them not constrained each other on gyratory directions again, thereby when travel switch malfunctioning after piston rod 2 moves to extreme position, when servomotor 5 output shafts rotated as if continuation rotating band movable wire bar 3, piston rod 2 can be along with screw pair rotates together.

Fig. 1, Fig. 2 illustrates the end that screw mandrel 3 is positioned at piston rod 2 and is connected with buffer unit, this buffer unit is by a left side, cushion pad 13, right cushion pad 15, buffer 21 and buffer pad head 16 constitute, left side cushion pad 13, link to each other by bearing pin 14 between right cushion pad 15 and the piston rod 2, connecting hole 13a on the cushion pad 13 of a left side and the connecting hole 15a on the right cushion pad 15 are bar hole, buffer pad head 16 is threaded on the right cushion pad 15, buffer 21 is threaded with left cushion pad 13, left side cushion pad 13 outer surfaces are arranged with two groove 13b of axial perforation, bar shaped connecting hole 13a is arranged on the bottom of groove 13b, there are two to connect pawl 15b and match on the right cushion pad 15 with groove 13b on the left cushion pad 13, bar shaped connecting hole 15a on the right cushion pad 15 is arranged on this connection pawl 15b, this compact conformation, can make a left side,

right cushion pad

13,15 realize that under the identical situation of external diameter bar hole connects, buffer 21 is similar to the damping shock absorption structure, when piston rod 2 turnover cylinder heads 1 arrive near extreme position, above-mentioned buffer unit begins to work, with a left side, right cushion pad 13, bar hole structure on 15 realizes the composite buffering cushioning effect together.

Fig. 3 is an electric control schematic diagram of the present utility model, PC host computer 22 sends instruction and gives motion controller 23, motion controller 23 is done integrated computing with instruction, the output control signal is given servo-driver 24, servo-driver requires output corresponding driving signal to give servomotor 5 according to control signal, transducer 25 on the servomotor 5 feeds back to motion controller 23 with the number of turns of running, motion controller 23 with the order of PC host computer 22 with after feedback signal is compared, export control signal again and give servo-driver 24, carry out system's closed-loop control, rotatablely moving of servomotor 5 then drives piston rod 2 moving linearlies by screw pair, thereby realize the motion of piston rod 2 is controlled by motion control to servomotor 5, this electric control principle is identical with existing SERVO CONTROL principle, and its physical circuit and control principle omit at this.

Claims

1, a kind of piston rod rectilinear motion control servo electric jar, comprise cylinder barrel (1) and piston rod (2), piston rod (2) is positioned at cylinder barrel (1), it is characterized in that: be provided with the screw pair that constitutes by screw mandrel (3) and nut (4) in the described cylinder barrel (1), piston rod (2) is a tubular structure, one end of piston rod (2) links to each other with nut (4) on the screw pair, the other end links to each other with cylinder barrel (1) gudgeon (19) that is connected outward, screw mandrel (3) one ends stretch in the piston rod (2), and the other end links to each other with the output shaft of servomotor (5) by belt pulley or shaft coupling.

2, piston rod rectilinear motion control servo electric jar according to claim 1, it is characterized in that: described piston rod (2) is connected with bolt (20) by ring flange (10) and intermediate mass (11) with nut (4) on the screw pair, is installed with check ring (12) on the piston rod (2) intermediate mass (11) is carried out axial limiting.

3, piston rod rectilinear motion control servo electric jar according to claim 1, it is characterized in that: the end that described screw mandrel (3) is positioned at piston rod (2) is connected with buffer unit, this buffer unit is by a left side, right cushion pad (13,15), buffer (21) and buffer pad head (16) constitute, a left side, right cushion pad (13,15) and between the piston rod (2) link to each other by bearing pin (14), a left side, right cushion pad (13,15) connecting hole (13a on, 15a) be bar hole, buffer pad head (16) is threaded on the right cushion pad (15), and buffer (21) is threaded with left cushion pad (13).

4, piston rod rectilinear motion control servo electric jar according to claim 3, it is characterized in that: described left cushion pad (13) outer surface is arranged with two grooves (13b) of axial perforation, bar shaped connecting hole (13a) is arranged on the bottom of groove (13b), have two to connect pawls (15b) and match with groove (13b) on the left cushion pad (13) on the right cushion pad (15), the bar shaped connecting hole (15a) on the right cushion pad (15) is arranged on this connection pawl (15b).