Servo electric cylinder

Abstract

The utility model discloses a servo electric cylinder, which relates to the technical field of servo electric cylinders and is characterized in that a driving belt pulley and a driven belt pulley are arranged in a base shell and are connected through a belt, a servo motor is mounted on the base shell, and an output shaft of the servo motor rotatably penetrates into the base shell and is fixed with the driving belt pulley; a cylinder barrel is installed on a base shell, a graphite copper sleeve is installed at the top end of the cylinder barrel through a bolt, an oil seal is installed on the upper surface of the graphite copper sleeve through a bolt, a ball screw is rotationally arranged in the cylinder barrel, and the ball screw is movably connected with a ball nut through a ball. The ball nut and the bottom of the push rod are fixed together through a bolt and synchronously slide in the cylinder barrel, and a screw rod end gear is fixed to the top end of the ball screw through threads; the utility model has the advantages that the arranged back-to-back bearing ensures the stable operation of the ball screw under the condition of large torsion; a graphite copper sleeve and an oil seal are mounted, so that dust and foreign matters can be effectively prevented from entering in the self-lubricating process of the push rod.

Description

Technical field:

[0001] The utility model relates to the technical field of servo electric cylinders, in particular to a servo electric cylinder. Background technology:

[0002] As the requirements for factory automation become higher and higher, the use of electric cylinders has become more and more widespread due to the problems of uncontrollable speed and low precision of hydraulic cylinders and pneumatic cylinders during use. Servo electric cylinders are modular products that integrate servo motors and ball screws to convert the rotary motion of servo motors into linear motion. Since servo electric cylinders use closed-loop servo control, high control precision, low cost, and flexible configuration, they are the best alternative to hydraulic cylinders and pneumatic cylinders and are widely used in military, entertainment facilities, automobile manufacturing and other industries.

[0003] The current problems are: some servo electric cylinders on the market have poor sealing problems. Once dust and foreign matter enter, it is very easy to wear the equipment and cause the automation accuracy of the servo electric cylinder to decrease; secondly, under the high torque of the servo motor, the ball screw will have unstable operation for a long time. Utility model content:

[0004] The purpose of the utility model is to provide a servo electric cylinder to solve the problems raised in the above background technology.

[0005] The utility model is implemented by the following technical solutions:

[0006] A servo electric cylinder comprises a base housing, a driving pulley, a driven pulley, a servo motor, an encoder, a cylinder barrel, a graphite copper sleeve, an oil seal, a ball screw, a locking sleeve, a ball nut, a push rod and a screw end stop;

[0007] A driving pulley and a driven pulley are relatively rotatable inside the base shell and are connected by a belt. A servo motor is installed on one side of the upper surface of the base shell by bolts, and an encoder is installed on the servo motor. The output shaft of the servo motor rotates and passes through the inside of the base shell and is fixed to the driving pulley. A cylinder is installed on the other side of the upper surface of the base shell, and a graphite copper sleeve is installed on the top of the cylinder by bolts, and an oil seal is installed on the upper surface of the graphite copper sleeve by bolts. A ball screw is rotatably arranged in the cylinder, and the bottom end of the ball screw rotates and passes through the inside of the base shell and is fixedly connected to the driven pulley by a tightening sleeve. The ball screw is movably connected by a ball and a ball nut, and the ball nut and the bottom of the push rod are fixed together by bolts and slide synchronously in the cylinder, and the top thread of the ball screw is fixed with a screw end stop.

[0008] Preferably, a shell cover is installed at the bottom of the base shell by bolts, and the base shell is provided with four waist holes around the driving pulley, and the servo motor is correspondingly arranged above the four waist holes and fixed to the upper surface of the base shell by penetrating bolts.

[0009] Preferably, an FK bearing seat is installed at the contact position between the cylinder and the bottom of the ball screw, and two bearings are installed in the FK bearing seat. The two bearings are distributed up and down in a back-to-back manner, and the ball screw is fixed on the inner rings of the two bearings.

[0010] Preferably, a locking nut is also installed on the ball screw, and the locking nut is located between the FK bearing seat and the base shell.

[0011] Preferably, the top end of the push rod passes through the graphite copper sleeve and the middle of the oil seal in sequence to the top of the cylinder barrel, and the top end of the push rod is threadedly connected with a connector.

[0012] Preferably, a holding brake is installed on the servo motor, and the servo motor can be connected to a power supply.

[0013] The advantages of the utility model are as follows: the displacement value of the push rod can be accurately controlled by outputting pulse values ​​of the servo motor; the torque during the operation of the push rod can be measured by the current of the servo to determine the state of the load; the back-to-back bearings are configured to ensure the stable operation of the ball screw under large torque conditions; the graphite copper sleeve and oil seal are installed to effectively prevent the entry of dust and foreign matter during the self-lubricating push rod. Description of the drawings:

[0014] Figure 1 It is a three-dimensional diagram of the utility model;

[0015] Figure 2 for Figure 1 Rear view of

[0016] Figure 3 It is a partial structural schematic diagram of the utility model;

[0017] Figure 4 for Figure 2 A schematic diagram of the structure inside the middle base shell;

[0018] Figure 5 for Figure 2 Cross-sectional view in the direction of A in the middle.

[0019] In the figure: 1. base housing, 1.1. housing cover, 1.2. waist hole, 2. driving pulley, 3. driven pulley, 4. servo motor, 5. encoder, 6. cylinder, 7. graphite copper sleeve, 8. oil seal, 9. ball screw, 11. expansion sleeve, 12. ball nut, 13. brake, 14. push rod, 15. screw end stop, 16. FK bearing seat, 17. locking nut, 18. connector. Specific implementation method:

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 , the utility model provides a servo electric cylinder technical solution:

[0022] A servo electric cylinder comprises a base housing 1, a driving pulley 2, a driven pulley 3, a servo motor 4, an encoder 5, a cylinder barrel 6, a graphite copper sleeve 7, an oil seal 8, a ball screw 9, a tightening sleeve 11, a ball nut 12, a push rod 14 and a screw end stop 15;

[0023] A driving pulley 2 and a driven pulley 3 are relatively rotatably arranged inside the base shell 1 and are connected by a belt. A servo motor 4 is installed on one side of the upper surface of the base shell 1 by bolts. An encoder 5 is installed on the servo motor 4. The output shaft of the servo motor 4 rotates and passes through the inside of the base shell 1 and is fixed to the driving pulley 2. A cylinder 6 is installed on the other side of the upper surface of the base shell 1. A graphite copper sleeve 7 is installed on the top of the cylinder 6 by bolts. The graphite copper sleeve 7 can play a self-lubricating role to avoid wear of the push rod 14 during operation; the graphite copper sleeve 7 An oil seal 8 is installed on the upper surface by bolts, which can effectively prevent the entry of dust and foreign matter; a ball screw 9 is rotatably arranged in the cylinder 6, and the bottom end of the ball screw 9 rotates to pass through the inside of the base shell 1 and is fixedly connected to the driven pulley 3 by a tightening sleeve 11. The ball screw 9 is movably connected by balls and ball nuts 12, and the ball nut 12 and the bottom of the push rod 14 are fixed together by bolts and slide synchronously in the cylinder 6. The top end of the ball screw 9 is threadedly fixed with a screw end stop 15, which prevents the ball screw 9 from overtravel movement.

[0024] A shell cover 1.1 is installed at the bottom of the base shell 1 by bolts. The base shell 1 has four waist holes 1.2 around the driving pulley 2. The servo motor 4 is correspondingly arranged above the four waist holes 1.2 and fixed to the upper surface of the base shell 1 by passing bolts. The tension of the belt can be adjusted by the position of the bolts.

[0025] An FK bearing seat 16 is installed at the contact position between the cylinder 6 and the bottom of the ball screw 9. Two bearings are installed in the FK bearing seat 16. The two bearings are distributed up and down in a back-to-back manner. Under large torque conditions, the stable operation of the ball screw 9 is guaranteed. The ball screw 9 is fixed on the inner rings of the two bearings.

[0026] A locking nut 17 is also installed on the ball screw 9. The locking nut 17 is located between the FK bearing seat 16 and the base housing 1 to prevent the two bearings in the FK bearing seat 16 from moving downward to achieve a limiting effect.

[0027] The top end of the push rod 14 passes through the graphite copper sleeve 7 and the middle of the oil seal 8 in sequence to the top of the cylinder 6. The top end of the push rod 14 is threadedly connected with a connector 18 for convenient connection with sports equipment.

[0028] The servo motor 4 is provided with a brake 13, which can prevent the servo motor shaft from moving when the servo drive is not in operation, so that the motor remains locked in position, so that the moving parts of the machine will not move due to their own weight or external force. The servo motor 4 can be connected to a power source.

[0029] The working principle is: when in use, first turn on the power, then open the brake 13, after the pulse output, the output shaft on the servo motor 4 drives the active pulley 2 to rotate, the active pulley 2 causes the driven pulley 3 to rotate synchronously through the belt, and the ball screw 9 is caused to rotate synchronously through the driven pulley 3. In the configuration, the precise position value of the push rod 14 can be controlled by outputting pulses according to the lead of the ball screw 9, so that the ball nut 12 can move up and down in the cylinder 6 under the action of the ball screw 9, so that part of the push rod 14 and the connecting head 18 can be telescopically moved up and down outside the top of the cylinder 6.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A servo electric cylinder, characterized in that: It comprises a base housing (1), a driving pulley (2), a driven pulley (3), a servo motor (4), an encoder (5), a cylinder (6), a graphite copper sleeve (7), an oil seal (8), a ball screw (9), a tightening sleeve (11), a ball nut (12), a push rod (14) and a screw end stop (15); A driving pulley (2) and a driven pulley (3) are relatively rotatably arranged inside the base shell (1) and are connected by a belt. A servo motor (4) is mounted on one side of the upper surface of the base shell (1) by means of bolts. An encoder (5) is mounted on the servo motor (4). The output shaft of the servo motor (4) is rotatably passed through the inside of the base shell (1) and is fixed to the driving pulley (2). A cylinder (6) is mounted on the other side of the upper surface of the base shell (1). A graphite copper sleeve (7) is mounted on the top of the cylinder (6) by means of bolts. An oil seal (8) is installed on the upper surface of the sleeve (7) by bolts, and a ball screw (9) is rotatably arranged in the cylinder (6). The bottom end of the ball screw (9) is rotated to pass through the inside of the base shell (1) and is fixedly connected to the driven pulley (3) by a tightening sleeve (11). The ball screw (9) is movably connected by balls and ball nuts (12). The ball nut (12) and the bottom of the push rod (14) are fixed together by bolts and slide synchronously in the cylinder (6). The top end of the ball screw (9) is threadedly fixed with a screw end stop (15).

2. A servo electric cylinder according to claim 1, characterized in that: The bottom of the base shell (1) is mounted with a shell cover plate (1.1) by means of bolts. The base shell (1) is provided with four waist holes (1.2) around the driving pulley (2). The servo motor (4) is correspondingly arranged above the four waist holes (1.2) and is fixed to the upper surface of the base shell (1) by means of bolts.

3. The servo electric cylinder according to claim 1, characterized in that: An FK bearing seat (16) is installed at the contact position between the cylinder (6) and the bottom of the ball screw (9), and two bearings are installed in the FK bearing seat (16). The two bearings are distributed up and down in a back-to-back manner, and the ball screw (9) is fixed on the inner rings of the two bearings.

4. The servo electric cylinder according to claim 1, characterized in that: A locking nut (17) is also mounted on the ball screw (9), and the locking nut (17) is located between the FK bearing seat (16) and the base housing (1).

5. The servo electric cylinder according to claim 1, characterized in that: The top end of the push rod (14) passes through the graphite copper sleeve (7) and the middle of the oil seal (8) in sequence to the top of the cylinder (6), and the top end of the push rod (14) is threadedly connected with a connector (18).

6. The servo electric cylinder according to claim 1, characterized in that: A holding brake (13) is installed on the servo motor (4), and the servo motor (4) can be connected to a power source.

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