Electric cylinder

Abstract

The utility model discloses an electric cylinder which comprises a cylinder barrel, a ball screw is arranged in the cylinder barrel through a first bearing, a push rod moving back and forth along the interior of the cylinder barrel is arranged on the ball screw through a moving block in a sleeved mode, and a plug used for sealing an inner cavity of the push rod is arranged at the end of the push rod. A key groove is formed in the inner wall of the cylinder barrel, and a key moving along the key groove is arranged on the outer wall of the push rod. A gear box connected with the ball screw is arranged on the cylinder barrel, and a motor used for driving the gear box is arranged on the cylinder barrel; and a speed reducer is arranged between the motor and the gear box. According to the electric cylinder, the motor drives the small gear in the gearbox to rotate through the speed reducer, the small gear drives the idle gear to rotate, the idle gear drives the large gear to rotate, the large gear drives the ball screw to rotate, the ball screw rotates to drive the moving block to move front and back, the moving block pushes the push rod to move front and back, and accurate control over the electric cylinder is achieved. And the response speed and the energy efficiency of the electric cylinder are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial production technical field more particularly relates to a kind of electric cylinder. BACKGROUND

[0002] Electric cylinder is also called electric actuator or servo electric cylinder, which is a kind of high-precision mechatronic device that converts rotary motion into linear motion by electric energy.

[0003] At present, electric cylinder mainly relies on hydraulic cylinder and pneumatic cylinder to realize linear motion, and these two kinds of electric cylinders have some problems in actual use: for example, hydraulic system has problems of oil leakage, complex maintenance and high energy consumption when in use; pneumatic system is limited by the stability of compressed air, low precision and controllability, so it is difficult to realize accurate control of electric cylinder, thereby it is difficult to guarantee the response speed and energy efficiency of electric cylinder. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide an electric cylinder, which can realize accurate control of electric cylinder, thereby guaranteeing the response speed and energy efficiency of electric cylinder.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is as follows.

[0006] An electric cylinder comprises a cylinder barrel, a ball screw is arranged in the inside of the cylinder barrel through a first bearing, a push rod that moves forward and backward along the inside of the cylinder barrel is arranged on the ball screw through a moving block, and a plug is arranged at the end of the push rod to close the internal cavity of the push rod; a key groove is arranged on the inner wall of the cylinder barrel, and a key that moves along the key groove is arranged on the outer wall of the push rod; a gear box connected with the ball screw is arranged on the cylinder barrel, and a motor for driving the gear box is arranged on the cylinder barrel; a speed reducer is arranged between the motor and the gear box.

[0007] Further optimization of the technical scheme is that a pinion connected with the speed reducer is arranged in the gear box, a idler gear is engaged with the pinion, a large gear is engaged with the idler gear, and the large gear is connected with the ball screw passing through the first bearing.

[0008] Further optimization of the technical scheme is that the ball screw is arranged at the center of the large gear through a nut.

[0009] Further optimization of the technical scheme is that a bearing seat is arranged in the cylinder barrel at the other end of the ball screw, a second bearing is arranged on the bearing seat, and the end of the ball screw is arranged on the second bearing.

[0010] Further optimization of the technical scheme is that a pressing plate is arranged on the outside of the second bearing, and the ball screw is arranged on the pressing plate through a nut.

[0011] Further optimization of the technical scheme is that the key is arranged on the push rod through a screw.

[0012] Thanks to the above technical solutions, the utility model has the following technical progress.

[0013] The utility model provides a kind of electric cylinder, motor drives pinion rotation in gear box by speed reducer, pinion drives idler wheel rotation, idler wheel drives gear rotation, gear drives ball screw rotation, ball screw rotation drives moving block forward and backward action, moving block pushes push rod forward and backward action, realize the accurate control of electric cylinder, guarantee the response speed and energy efficiency of electric cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the structure schematic diagram of the utility model;

[0015] Fig. 2 It is the internal structure schematic diagram of the utility model.

[0016] Wherein: 1. cylinder, 2. gear box, 3. speed reducer, 4. motor, 5. pinion, 6. idler wheel, 7. gear, 8. nut, 9. ball screw, 10. moving block, 11. push rod, 12. first bearing, 13. keyway, 14. key, 15. screw, 16. bearing seat, 17. second bearing, 18. pressing plate, 19. plug. DETAILED DESCRIPTION

[0017] The utility model will be further explained in detail in connection with the drawings and specific embodiment.

[0018] A kind of electric cylinder, in combination Figs. 1-2 As shown in the figure, including cylinder 1, the inside of cylinder 1 is provided with ball screw 9, push rod 11 is set on ball screw, cylinder 1 is provided with motor 4 and gear box 2, motor drives ball screw rotation by gear box, to realize the forward and backward movement of push rod 11.

[0019] Motor shaft of motor 4 is provided with speed reducer 3, gear box 2 is connected with speed reducer 3, pinion 5, idler wheel 6 and gear 7 are provided in gear box 2, pinion 5 is connected on speed reducer 3, idler wheel 6 is set in the inside of gear box 2 by bearing, idler wheel is engaged with pinion, gear 7 is connected on ball screw 9, gear is engaged with idler wheel, motor drives pinion rotation by speed reducer, pinion drives idler wheel rotation, idler wheel drives gear rotation, to realize the rotation of ball screw 9.

[0020] Ball screw 9 is set in cylinder 1 by first bearing 12, ball screw 9 is connected with gear 7 by passing through first bearing 12, ball screw is set in the center of gear 7 by nut 8.

[0021] A bearing seat 16 is arranged in the cylinder 1 at the other end of the ball screw 9, a second bearing 17 is arranged on the bearing seat 16, and the end of the ball screw 9 is arranged on the second bearing 17. A pressing plate 18 is arranged on the outer side of the second bearing 17, and the ball screw 9 is arranged on the pressing plate 18 through the nut 8.

[0022] A push rod 11 is sleeved on the ball screw 9 through a moving block 10, a plug 19 is arranged at the end of the push rod 11, and the plug 19 is used for sealing the internal cavity of the push rod. The moving block 10 is connected with the ball screw through threads, and the ball screw drives the moving block to move back and forth.

[0023] A key groove 13 is arranged on the inner wall of the cylinder 1, and a key 14 is arranged on the outer wall of the push rod 11. The key is arranged on the push rod 11 through a screw 15. When the ball screw drives the moving block to move back and forth, the key groove limits the moving position of the key. The push rod moves back and forth, and the push rod is prevented from rotating with the moving block. Through the arrangement of the key groove and the key, the push rod moves back and forth with the rotation of the ball screw.

[0024] In the working process of the utility model, the motor drives the pinion in the gear box to rotate through the speed reducer, the idler is driven to rotate by the pinion, the gear is driven to rotate by the idler, the ball screw is driven to rotate by the gear, the moving block is driven to move back and forth by the ball screw, the push rod is driven to move back and forth by the moving block, the precise control of the electric cylinder is realized, and the response speed and energy efficiency of the electric cylinder are ensured.

Claims

1. An electric cylinder, characterized in that: The cylinder (1) includes a ball screw (9) installed inside the cylinder (1) via a first bearing (12). A push rod (11) that moves back and forth inside the cylinder (1) is mounted on the ball screw (9) via a moving block (10). A plug (19) for sealing the internal cavity of the push rod (11) is provided at the end of the push rod (11). A keyway (13) is provided on the inner wall of the cylinder (1), and a key (14) that moves along the keyway (13) is provided on the outer wall of the push rod (11). A gearbox (2) connected to the ball screw (9) is provided on the cylinder (1), and a motor (4) for driving the gearbox (2) is provided on the cylinder (1). A reducer (3) is provided between the motor (4) and the gearbox (2).

2. An electric cylinder according to claim 1, characterized in that: The gearbox (2) is provided with a small gear (5) connected to the reducer (3), an idler gear (6) meshes with the small gear (5), a large gear (7) meshes with the idler gear (6), and the large gear (7) is connected to the ball screw (9) that passes through the first bearing (12).

3. An electric cylinder according to claim 2, characterized in that: The ball screw (9) is set at the center of the large gear (7) via a nut (8).

4. An electric cylinder according to claim 1, characterized in that: A bearing housing (16) is provided in the cylinder (1) at the other end of the ball screw (9), and a second bearing (17) is provided on the bearing housing (16). The end of the ball screw (9) passes through the second bearing (17).

5. An electric cylinder according to claim 4, characterized in that: A pressure plate (18) is provided on the outer side of the second bearing (17), and the ball screw (9) is mounted on the pressure plate (18) by a nut (8).

6. An electric cylinder according to claim 1, characterized in that: The key (14) is mounted on the push rod (11) by a screw (15).

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