An electric cylinder drive device that facilitates routine maintenance

Abstract

This utility model discloses an electric cylinder drive device that facilitates daily maintenance. It includes an electric cylinder body and an electric cylinder swing frame housing a servo motor. The top of the swing frame is fixedly connected to the bottom of the cylinder body via a bearing seat. The servo motor is fixed to the bearing seat via a support cylinder, with all three coaxial, allowing the servo motor to be positioned close to the ground. A coupling is installed inside the support cylinder. The electric cylinder body includes an outer cylinder tube, an inner cylinder tube, and a ball screw. The top of the ball screw is slidably mounted in the inner cylinder tube via a radial adjusting bearing, and the bottom is connected to the output shaft of the servo motor via a coupling. During operation, the servo motor drives the ball screw to rotate, causing the ball screw nut to make the inner cylinder tube move linearly within the outer tube. This utility model, by placing the servo motor inside the bottom electric cylinder swing frame, significantly improves maintenance convenience, avoids the risks of working at heights, and saves downtime. Compared to the traditional top-mounted servo motor design, it offers higher safety and ease of operation.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction equipment, and in particular relates to an electric cylinder drive device that is easy to maintain in daily life. Background Technology

[0002] In existing electric cylinder pumping units, electric cylinders with integrated motor and lead screw are commonly used as linear actuators. In this type of electric cylinder drive unit, the servo motor is often mounted on the top of the electric cylinder body via a flange, arranged coaxially or parallel to the lead screw, so that the servo motor rises and falls together with the entire electric cylinder, forming a top-following layout. This is because early electric cylinders evolved from a combination of hydraulic cylinders and a top-mounted hydraulic motor. Designers followed the intuitive idea of ​​placing the power source at the piston rod extension end and directly replaced the hydraulic motor with a servo motor, thus forming the inertial layout of top-following.

[0003] However, this existing technology of mounting the servo motor on top of the electric cylinder body has the following problems in practical applications:

[0004] 1. High-altitude maintenance is risky and costly. When the servo motor is located at the top of the equipment, it is often 3 to 8 meters above the ground, or even higher. Therefore, once a malfunction occurs, in addition to having to stop the machine, the electric cylinder drive system of the pumping unit must be disassembled to open the servo motor for repair, which greatly increases the maintenance cost. Furthermore, during maintenance, scaffolding or a lift vehicle needs to be erected, which is considered working at height and near the edge, posing multiple safety risks such as falls, electric shock, and being struck by objects. At the same time, frequent climbing operations require additional climbing vehicles, safety supervisors, and personal protective equipment. The labor and equipment costs for a single maintenance are far higher than those for ground operations.

[0005] 2. Long downtime due to malfunctions leads to low efficiency. If the servo motor of the top follow-up structure overheats, malfunctions, or is damaged, a whole set of high-altitude operation procedures must be followed, such as high-altitude work permit approval, platform erection, power outage and tagging, and safety belt fastening. This means that the average maintenance time often exceeds 2 hours. For production lines that operate continuously for 24 hours, the downtime losses are significant.

[0006] 3. The structure is bulky and sways a lot. When the servo motor is placed at the top of the device, it will cause the center of gravity of the whole machine to shift upward. The greater the lifting stroke, the greater the inertial torque. In addition, it is more likely to sway and make abnormal noises when running at high speed. Additional guide rods or anti-sway devices are required, which further increases the weight and cost of the device and also affects safety and the construction environment.

[0007] In summary, traditional top-mounted electric cylinder drive devices have significant limitations in terms of high-altitude maintenance, fault response, and structural reliability. Therefore, there is an urgent need for an electric cylinder drive device that can be maintained on the ground, reduce safety risks, and shorten downtime. Utility Model Content

[0008] To address the problems existing in the prior art, the purpose of this utility model is to provide an electric cylinder drive device that is easy to maintain in daily use. The device of this utility model can ensure safe and reliable construction process, efficient and smooth oil pumping operation, low maintenance cost, improve environmental cleanliness, eliminate environmental noise, significantly improve the convenience of equipment maintenance and operational safety, and solve the problem of difficult maintenance caused by the high-position follow-up of the servo motor in traditional electric cylinder drive devices.

[0009] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0010] This utility model provides an electric cylinder drive device that is easy to maintain in daily life, including an electric cylinder body and an electric cylinder swing frame, wherein the top of the electric cylinder swing frame is fixedly connected to the bottom of the electric cylinder body through a bearing seat;

[0011] The electric cylinder swing frame is equipped with a servo motor. The servo motor is fixed to the bearing seat by a support cylinder, so that the servo motor is close to the ground. The servo motor, the support cylinder and the bearing seat are coaxial. The support cylinder is equipped with a coupling.

[0012] The electric cylinder body includes an outer cylinder tube, an inner cylinder tube sleeved inside the outer cylinder tube, and a ball screw, on which a ball screw nut is provided;

[0013] The top of the ball screw is slidably mounted in the inner tube of the electric cylinder via a radial adjusting bearing; the bottom of the ball screw is connected to the output shaft of the servo motor via the coupling and is fixed to the bearing seat via a main bearing.

[0014] During operation, the servo motor located at the bottom provides upward power, driving the ball screw to rotate, which in turn causes the ball screw nut to drive the inner tube of the electric cylinder to move linearly within the outer tube of the electric cylinder.

[0015] As a preferred technical solution, the bearing housing is embedded in the inner wall of the electric cylinder swing frame.

[0016] As a preferred technical solution, the servo motor is a servo motor with brake.

[0017] As a preferred technical solution, a permanent magnet brake is also provided between the servo motor and the support cylinder. The top of the permanent magnet brake is fixed to the support cylinder, and the braking component of the permanent magnet brake is clamped on the output shaft of the servo motor to form a double braking.

[0018] As a preferred technical solution, the coupling is a split diaphragm coupling, and the two ends of the split diaphragm coupling are respectively detachably fixed to the output shaft of the servo motor and the end of the ball screw.

[0019] As a preferred technical solution, a guide bar is provided between the radial adjusting bearing and the inner tube of the electric cylinder. The guide bar is embedded in the edge side wall of the radial adjusting bearing and slides in contact with the inner wall of the inner tube of the electric cylinder.

[0020] As a preferred technical solution, a lubricating oil sump is provided inside the outer tube of the electric cylinder. When the ball screw nut moves to the lowest end of the ball screw, the level of the lubricating oil sump is higher than the top of the ball screw nut.

[0021] As a further preferred technical solution, an electric cylinder piston mechanism is also provided between the outer tube and the inner tube of the electric cylinder. The electric cylinder piston mechanism includes upper guide sleeves of the inner and outer tubes, a fixing nut, and lower guide sleeves of the inner and outer tubes. The lower guide sleeves of the inner and outer tubes are fixedly connected to the lower end of the ball screw nut. The upper guide sleeves of the inner and outer tubes are fixedly connected to the outer side wall of the inner tube of the electric cylinder. The inner tube of the electric cylinder is pressed and fixed by the fixing nut and the ball screw nut. At the same time, the fixing nut is pressed and fixed by the upper guide sleeves and the lower guide sleeves of the inner and outer tubes.

[0022] As described above, the present invention has the following beneficial effects:

[0023] (1) The electric cylinder drive device of this utility model is easy to maintain. The servo motor is set in the electric cylinder swing frame at the bottom of the electric cylinder drive device, so that the servo motor is closer to the ground, which is convenient for daily maintenance. Once a fault occurs, it can be checked and repaired in time. Maintenance personnel do not need to climb to a high position to move and work. They can directly perform maintenance operations on the ground, avoiding the high-altitude operation of the original technology, significantly reducing safety risks and downtime. Therefore, compared with the existing technology where the motor is at the top and follows, it has greater safety and maintenance convenience. In addition, the detachable connection method of the split diaphragm coupling further improves the ease of maintenance.

[0024] (2) The electric cylinder drive device of this utility model is easy to maintain in daily life. By designing the servo motor at the bottom of the electric cylinder drive device, combined with the inner and outer tube straightening and anti-leakage mechanism, it can also effectively reduce high-position follow-up vibration, avoid the off-center load wear of the coupling and ball screw, ensure smooth movement, and extend the service life of the device while improving the stability of operation.

[0025] (3) The electric cylinder drive device of this utility model is easy to maintain in daily life. By adopting a servo motor with brake and adding a permanent magnet brake between the servo motor and the support cylinder, it provides double braking protection and improves the safety of device operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an electric cylinder drive device that is easy to maintain in daily use, according to this utility model.

[0027] Figure 2 This is a schematic diagram of the connection between the ball screw and the inner and outer tubes in an electric cylinder drive device that is easy to maintain in daily use, according to this utility model.

[0028] Figure 3 This is a schematic diagram of the top of the inner tube of the electric cylinder in an electric cylinder drive device that is easy to maintain in daily use, according to this utility model.

[0029] Figure 4 This is a schematic diagram of the bearing housing in an electric cylinder drive device that is easy to maintain in daily use, according to this utility model.

[0030] The specific annotations in the attached drawings are as follows: 1. Servo motor; 2. Electric cylinder swing frame; 3. Bearing housing; 4. Coupling; 5. Ball screw; 6. Ball screw nut; 7. Main bearing; 8. Electric cylinder outer tube; 9. Electric cylinder inner tube; 11. Radial adjusting bearing; 13. Support cylinder; 17. Lubricating oil sump; 18. Permanent magnet brake; 33. Screw locking nut; 36. Upper guide sleeve of inner and outer tubes; 37. Fixing nut; 38. Lower guide sleeve of inner and outer tubes. Detailed Implementation

[0031] To better understand the purpose, structure, and function of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides an electric cylinder drive device that is easy to maintain in daily life, including an electric cylinder body and an electric cylinder swing frame 2.

[0034] The top of the electric cylinder swing frame 2 is fixedly connected to a bearing seat 3, and the electric cylinder swing frame 2 is fixedly connected to the bottom of the electric cylinder body through the bearing seat 3. Specifically, as shown... Figure 4 As shown, the bearing seat 3 is embedded in the inner wall of the electric cylinder swing frame 2 to improve structural stability and vibration resistance, so that the bearing seat 3 can withstand more weight and vibration and avoid shaking.

[0035] A servo motor 1 is installed inside the electric cylinder swing frame 2. The servo motor 1 serves as the system power source, providing output power and driving the electric cylinder movement under program control. The upper end of the servo motor 1 is fixed upward to the bearing seat 3 via a support cylinder 13, ensuring the servo motor is close to the ground. Furthermore, the servo motor 1, the support cylinder 13, and the bearing seat 3 are coaxially aligned, with their centers on the same axis. Specifically, the bottom of the support cylinder 13 is fixedly connected to the upper end of the servo motor 1, and the top of the support cylinder 13 is fixed to the bottom of the bearing seat 3. A coupling 4 is provided inside the support cylinder 13. In this embodiment, the servo motor 1 is a braked servo motor 1, meaning it has a built-in stopping braking function. Preferably, a permanent magnet brake 18 is further provided between the servo motor 1 and the support cylinder 13. The top of the permanent magnet brake 18 is fixed to the support cylinder 13, and the braking component located at the bottom of the permanent magnet brake 18 is clamped on the output shaft located at the top of the servo motor 1, which can effectively enhance the braking effect to achieve double braking insurance. By always setting the servo motor 1 at the bottom of the electric cylinder drive device, daily maintenance is convenient, and in case of failure, timely inspection and maintenance can be carried out. Therefore, compared with the servo motor in the prior art that is located at the top and follows the movement, it has greater safety and maintenance convenience.

[0036] like Figure 2 As shown, the electric cylinder body includes an outer cylinder tube 8, an inner cylinder tube 9 sleeved inside the outer cylinder tube 8, and a ball screw 5. A ball screw nut 6 is threadedly fixed to the ball screw 5. The bottom of the inner cylinder tube 9 is threadedly fastened to the ball screw nut 6, and the bottom of the outer cylinder tube 8 is fixedly connected to the bearing seat 3.

[0037] like Figure 3 As shown, the top of the ball screw 5 is slidably disposed within the inner tube 9 of the electric cylinder via a radial adjusting bearing 11. Preferably, a guide strip is further provided between the radial adjusting bearing 11 and the inner tube 9 of the electric cylinder. The guide strip is embedded in the edge sidewall of the radial adjusting bearing 11 and slides in contact with the inner wall of the inner tube 9 of the electric cylinder. In this embodiment, the guide strip is made of tetrafluoroethylene (PTFE).

[0038] The bottom of the ball screw 5 is connected to the output shaft of the servo motor 1 via a coupling 4, and the ball screw 5 is fixed to the bearing housing 3 via a main bearing 7. Specifically, the portion of the ball screw 5 extending downward from the main bearing 7 is locked and fixed by a screw locking nut 33. In this embodiment, the coupling 4 is a split diaphragm coupling 4, and both ends of the split diaphragm coupling 4 are detachably fixed to the output shaft of the servo motor 1 and the end of the ball screw 5, respectively, thereby facilitating maintenance and repair of the components at the bottom of the main bearing 7.

[0039] like Figure 2 As shown, an electric cylinder piston mechanism is also provided between the outer tube 8 and the inner tube 9 of the electric cylinder. Specifically, the electric cylinder piston mechanism includes an upper guide sleeve 36, a fixing nut 37, and a lower guide sleeve 38 of the inner and outer tubes. The upper guide sleeve 36 and the lower guide sleeve 38 of the inner and outer tubes are located above and below the fixing nut 37, respectively. The inner end of the upper guide sleeve 36 abuts against the inner tube 9 of the electric cylinder and the outer end abuts against the outer tube 8 of the electric cylinder. The inner end of the lower guide sleeve 38 abuts against the ball screw nut 6 and the outer end abuts against the outer tube 8 of the electric cylinder. During installation, first lock the lower guide sleeve 38 of the inner and outer tubes to the lower end of the ball screw nut 6. Then, install the fixing nut 37, the inner tube of the electric cylinder 9, and the upper guide sleeve 36 of the inner and outer tubes in sequence and tighten them. The upper guide sleeve 36 of the inner and outer tubes is locked to the outer wall of the inner tube of the electric cylinder 9. The fixing nut 37 can lock the inner tube of the electric cylinder 9 to the ball screw nut 6. At the same time, the upper guide sleeve 36 and the lower guide sleeve 38 of the inner and outer tubes can squeeze and fix the fixing nut 37. This allows the ball screw nut 6 to move up and down with the rotation of the ball screw 5, and simultaneously drive the inner tube of the electric cylinder 9 to perform reciprocating piston motion in the outer tube 8 of the electric cylinder.

[0040] like Figure 2 and Figure 4 As shown, a lubricating oil reservoir 17 is also provided inside the outer tube 8 of the electric cylinder. The lubricating oil reservoir 17 is located at the bottom of the outer tube 8 of the electric cylinder. When the ball screw nut 6 moves to the lowest end of the ball screw 5, the liquid level of the lubricating oil reservoir 17 is higher than the top of the ball screw nut 6, so that the lower end of the ball screw nut 6, the ball screw 5, and the main bearing 7 are all immersed in the lubricating oil reservoir 17, ensuring the lubrication between the components and improving the smoothness of the device operation.

[0041] In other embodiments, when the electric cylinder drive device is used for an oil pumping unit, the bottom of the electric cylinder swing frame 2 is hinged to the electric cylinder base of the oil pumping unit, allowing the electric cylinder swing frame 2 to swing around the swing axis of the electric cylinder base of the oil pumping unit. Simultaneously, the top of the electric cylinder inner tube 9 is connected to the walking beam of the oil pumping unit via an inner tube swing seat. During operation, the servo motor 1 located at the bottom provides upward power, driving the ball screw to rotate. At this time, the ball screw nut 6 moves forward or backward on the ball screw 5, driving the electric cylinder inner tube 9 forward or backward. This causes the electric cylinder inner tube 9 to move vertically within the electric cylinder outer tube 8 along with the relative movement between the ball screw nut 6 and the ball screw. The inner tube swing seat then drives the walking beam to swing up and down, thereby pushing the walking beam of the oil pumping unit to swing up and down around its central fulcrum, achieving the purpose of oil extraction.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by the present invention.

Claims

1. An electric cylinder drive device that is easy to maintain in daily life, characterized in that, It includes an electric cylinder body and an electric cylinder swing frame, wherein the top of the electric cylinder swing frame is fixedly connected to the bottom of the electric cylinder body through a bearing seat; The electric cylinder swing frame is equipped with a servo motor. The servo motor is fixed to the bearing seat by a support cylinder, so that the servo motor is close to the ground. The servo motor, the support cylinder and the bearing seat are coaxial. The support cylinder is equipped with a coupling. The electric cylinder body includes an outer cylinder tube, an inner cylinder tube sleeved inside the outer cylinder tube, and a ball screw, on which a ball screw nut is provided; The top of the ball screw is slidably mounted in the inner tube of the electric cylinder via a radial adjusting bearing; the bottom of the ball screw is connected to the output shaft of the servo motor via the coupling and is fixed to the bearing seat via a main bearing. During operation, the servo motor located at the bottom provides upward power, driving the ball screw to rotate, which in turn causes the ball screw nut to drive the inner tube of the electric cylinder to move linearly within the outer tube of the electric cylinder.

2. The electric cylinder drive device for easy daily maintenance according to claim 1, characterized in that, The bearing housing is embedded in the inner wall of the electric cylinder swing frame.

3. The electric cylinder drive device for easy daily maintenance according to claim 1, characterized in that, The servo motor is a servo motor with brake.

4. The electric cylinder drive device for easy daily maintenance according to claim 1, characterized in that, A permanent magnet brake is also provided between the servo motor and the support cylinder. The top of the permanent magnet brake is fixed to the support cylinder, and the braking component of the permanent magnet brake is clamped on the output shaft of the servo motor to form a double braking.

5. The electric cylinder drive device for easy daily maintenance according to claim 1, characterized in that, The coupling is a split diaphragm coupling, and both ends of the split diaphragm coupling are detachably fixed to the output shaft of the servo motor and the end of the ball screw, respectively.

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