CN2796222Y - Electric executor - Google Patents

Abstract

The utility model relates to an electric executer which the work made by the motor rotation is changed into the rectilinear motion output from the rotary motion through a leading screw. It includes a torque motor, and an output shaft of the motor is a hollow shaft (9). The leading screw (2) is arranged in the hollow shaft (9), and the outside terminal of the hollow shaft (9)is provided with a nut (13) fixed to a rotor of the torque motor, and the nut is rotatablely sheathed with the leading screw (2). One end of the leading screw (2)is connected with a coupling head (1) which is convenient to connect with a drive device, and the other end of the leading screw (2) is positioned in the hollow shaft, and it is provided with a range control mechanism. Because the utility model can directly change the rotary motion of the motor into the rectilinear motion through the leading screw, and it need not the additional machine, and thus it makes the structure get great simplification. If the profile chooses a pin bush connection structure, it can absorb the influence of the rectilinear motion and the curve motion, which ensures the braking process.

Description

Electric actuator

Technical field

The utility model belongs to a kind of mechanical movement control device, specifically, is a kind of electric actuator that rotatablely moving of motor is become the output shaft gun.

Background technology

The effect of electric actuator is the rectilinear motion that rotatablely moving of motor output shaft is transformed into output shaft.Chinese patent 93202986.8 discloses a kind of electric actuator that is applicable to that occasions such as electrically operated valve, electronic jack, electronic pull bar are used, it has installed one and its out-of-alignment eccentric bushing on the leading screw side, the existing revolution of eccentric interplanting has the planetary motion of rotation again, because its rotary speed is very slow, make rectilinear motion at a slow speed with the leading screw of its engagement, so can not meet the needs of the occasion of rectilinear motion output faster.

Rail truck has used automated system in the marshalling process AT STATION in recent years, has used radar velocity measurement, deceleration and dead-weight deceleration device during the hump in this system is banished.The dead-weight deceleration device mainly contains hydraulic pressure, pneumatic and electronic three kinds, and in use pneumatic means leaks out easily, and the reservoir wearing and tearing are installed complicated; There are two movements in a curve to become rectilinear motion again in the electronic reductor electrodynamic braking process, increased loss; In addition, motor is in braking and alleviation process, and a motor turnback is just stopped suddenly, so just caused rotor in unexpected docking process, because effect of inertia is crossed ambassador's electric drive axle and connecting lever and lower margin to the active force of axle and all born very big active force, be subjected to an easy deformation to wipe iron.Generally speaking, its shortcoming is easy off-axis and heating, and lower margin fracture and electric current are excessive or the like.

Summary of the invention

The utility model purpose provide a kind of merit of being done when motor is rotated by leading screw the be in line electric actuator of motion output of rotation motion.

Specifically, a kind of electric actuator that rotatablely moving of motor is become the output shaft gun, comprise a torque motor, the output shaft of this motor is hollow shaft (9), leading screw (2) is housed in the hollow shaft (9), it is coaxial with leading screw that the outer end of hollow shaft (9) has the nut (13) that is fixed on the torque motor rotor and this nut rotation set to go up at leading screw (2), is connected with at an end of leading screw (2) and is convenient to the coupling head (1) that is connected with driven device.

Be positioned at hollow shaft at leading screw (2) other end buffer spring (8) also is housed.The effect of buffer spring is to slow down the collision of leading screw to the hollow shaft top.

Whether put in place and prevent to answer back to spring for surveying the leading screw backhaul, be positioned at hollow shaft at leading screw (2) other end range controlling mechanism is housed.

Because the utility model directly becomes rectilinear motion to rotatablely moving of motor by a leading screw, need not add machinery, structure is simplified greatly, if profile is selected the guide syndeton for use, can absorb the influence of rectilinear motion and movement in a curve, guarantee braking procedure.Adopt torque motor simultaneously, improved efficient, reduced motor current, be applied to its converting equipment is reduced, total investment is reduced.

Description of drawings

Accompanying drawing is the utility model structural representation.

Embodiment

Because the structure of torque motor has two kinds of internal rotor and external rotors.But no matter the torque motor of that a kind of structure all can be suitable for the utility model.The internal rotor torque motor electric actuator of making as shown in drawings, comprise a torque motor, the output shaft of this motor is hollow shaft (9), leading screw (2) is housed in the hollow shaft (9), the outer end of hollow shaft (9) has the nut (13) and this nut rotation set that are fixed on the torque motor rotor to go up coaxial with leading screw at leading screw (2), be connected with at an end of leading screw (2) and be convenient to the coupling head (1) that is connected with driven device, be positioned at hollow shaft at leading screw (2) other end range controlling mechanism is housed.Be positioned at hollow shaft at leading screw (2) other end buffer spring (8) also is housed.Described range controlling mechanism can be an electric contact or pressure sensor, when the leading screw backhaul touch or lean put in place after, provide a signal of telecommunication motor stop the action or the counter-rotating, prevent to damage by pressure buffer spring.

For the external rotor torque motor, the same needs of the utility model with said structure with nut and motor rotor is fixed and a leading screw is installed in hollow shaft and and nut mesh and to get final product, the utility model is not providing its schematic structure.

The utility model uses can directly replace reservoir in rail truck marshalling process.At this moment can utilize the difference of leading screw or nut shape to make by auto-lock function or not with two kinds of devices of auto-lock function.Motor is selected torque motor for use, and rotor structure is selected for use iron to add permanent magnet and made.Like this, the breakdown torque formula of motor is as follows:

Motor maximum torque formula is as follows: $M\max =\frac{m_1}{\mathrm{wo}}\·\frac{{U^2}_{\mathrm{\φ}1}}{2(\sqrt{r_1^2+{(x_1+x_2)}^2}+r_1)},$ $\mathrm{Wo}=\frac{2\mathrm{\πf}1}{p}$

-------------motor electricity large torque of Mmax in the formula

Wo-------------synchronization mechanism angular speed

m ₁-------------stator number of phases

U φ ₁-------------stator phase voltage

P-------------level logarithm

f ₁-------------supply frequency (Hz)

r ₁-------------electronics phase resistance (Ω)

x ₁-------------stator leakage reactance (Ω)

x ¹ ₂-------------convert rotor leakage reactance (Ω) on stator limit

Usually higher (X1+X2)＞＞r, so r1 ignore, and with total leakage reactance X=x1+x2 and synchronous angular velocity $M\max =\frac{m_{1}p{u}_{\mathrm{\φ}1}^2}{4\mathrm{\π}{f}_{1}x}$ The substitution following formula obtains.

This electric power thruster rotor of selecting for use permanent magnet and iron to make big switch cabinet in that can reduce to leak electricity as can be seen from following formula.Certainly the magnetic flux of permanent magnet is the bigger the better and selects back family boron, iron, rubidium permanent magnet the best for use.

Since motor rotation with being that thick stick has become rectilinear motion.We have taken diameter d=60 millimeter also to have amplified simultaneously active force, and the multiplication factor of pitch t=20 power is about 4 times, and power of electric motor also can reduce like this.Motor current has just reduced like this.

The converting equipment of railway marshalling yard can be reduced.The effect that makes total investment obtain reducing.

Claims (3)

1, a kind of electric actuator that rotatablely moving of motor is become the output shaft gun, comprise a torque motor, the output shaft that it is characterized in that this motor is hollow shaft (9), leading screw (2) is housed in the hollow shaft (9), it is coaxial with leading screw that the outer end of hollow shaft (9) has the nut (13) that is fixed on the torque motor rotor and this nut rotation set to go up at leading screw (2), is connected with at an end of leading screw (2) and is convenient to the coupling head (1) that is connected with driven device.

2, electric actuator according to claim 1 is characterized in that being positioned at hollow shaft at leading screw (2) other end also is equipped with buffer spring (8).

3, electric actuator according to claim 1 and 2 is characterized in that being positioned at hollow shaft at leading screw (2) other end is equipped with range controlling mechanism.