Energy storage electric cylinder with brake and mechanical limit

Abstract

The utility model belongs to electric cylinder technical field discloses a kind of energy storage electric cylinder with brake and mechanical limiting.This energy storage electric cylinder includes electric cylinder assembly and driving assembly, electric cylinder assembly includes cylinder barrel, cylinder barrel two ends are equipped with bearing seat and cylinder barrel cover respectively, built-in ball screw in cylinder barrel, ball screw is sequentially equipped with limit sleeve, disc spring baffle and screw nut outside;Limit sleeve is equipped with disc spring group, disc spring group one end and limit sleeve abut, the other end and disc spring baffle abut;Disc spring baffle and screw nut are connected, and piston rod assembly is installed outside limit sleeve of screw nut.The utility model is through built-in centrifugal brake, double limiting structure and disc spring energy storage mechanism, realize the power-off protection of electric cylinder, reliable limiting and power-off work;Solve the problem that electric cylinder cannot reset, lack power-off protection and unreliable limiting in prior art after power-off.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder technology, and in particular to an energy storage electric cylinder with braking and mechanical limit, which is suitable for application scenarios that require power failure protection, mechanical reset and dual limit. Background Technology

[0002] An electric cylinder is a linear actuator that converts the rotary motion of a motor into linear motion and is widely used in industrial automation. Existing electric cylinders cannot automatically reset after a power outage and lack effective power-off protection measures. For example, Chinese patent CN222321295U discloses an energy storage electric cylinder, including a motor, a reducer bolted to the output end of the motor, a coupling bolted to the output end of the reducer, a bearing end on one side of the coupling, a ball screw rotatably connected inside the bearing end, a ball nut threaded onto the surface of the ball screw, a push rod bolted to one end of the ball nut, a sleeve bolted to one side of the bearing end, and an energy storage spring fitted onto the surface of the ball nut.

[0003] However, the aforementioned electric cylinder can only return to a specific position when power is off, and the thrust of the energy storage spring may exceed the braking force of the motor, causing the electric cylinder to be in an accelerated state, leading to safety hazards. In addition, the existing electric cylinder has a single limiting method, relying solely on electrical limiting, and cannot effectively limit the movement when the switch fails. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an energy storage electric cylinder with braking and mechanical limit. Through the built-in centrifugal brake, double limit structure and disc spring energy storage mechanism, the electric cylinder can realize power failure protection, reliable limit and power failure operation; and solve the problems of electric cylinders not being able to reset after power failure, lack of power failure protection and unreliable limit in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An energy storage electric cylinder with braking and mechanical limiting includes an electric cylinder assembly and a drive assembly for driving the electric cylinder assembly. The drive assembly includes a motor, and a reducer is connected to the output shaft of the motor.

[0007] The electric cylinder assembly includes a cylinder barrel, with bearing seats and cylinder barrel cover plates respectively provided at both ends of the cylinder barrel, and the bearing seats are located close to the reducer; a ball screw is built into the cylinder barrel, and one end of the ball screw passes through the bearing seat and is connected to the output shaft of the reducer;

[0008] A limiting sleeve, a disc spring baffle, and a screw nut are sequentially fitted around the ball screw. The ball screw and the screw nut are threaded together. The limiting sleeve is located near the bearing seat, and one end of the limiting sleeve contacts the inner wall of the cylinder. A disc spring assembly is fitted around the limiting sleeve. One end of the disc spring assembly abuts against the limiting sleeve, and the other end of the disc spring assembly abuts against the disc spring baffle. The disc spring baffle is connected to the screw nut, and a piston rod assembly extending out of the cylinder cover plate is fitted around the screw nut.

[0009] Furthermore, a buffer ring is installed on the inner side of the cylinder cover plate.

[0010] Furthermore, the cylinder is provided with a first limit switch assembly and a second limit switch assembly for sensing the position of the disc spring baffle, and the first limit switch assembly and the second limit switch assembly are arranged back and forth along the movement direction of the piston rod assembly.

[0011] The cylinder is equipped with a disc spring assembly. When the piston rod assembly retracts, it compresses the disc spring assembly to store energy. When the power is off, the disc spring assembly releases energy to push the piston rod assembly to reset.

[0012] The first and second limit switch assemblies, acting as electrical limit components, sense the position of the disc spring baffle and thus control the motor brake. Upon power failure, the electrical limit components cease functioning; in this case, the right end of the limit sleeve acts as the upper mechanical limit, and the buffer washer acts as the lower mechanical limit, ensuring the reliability of the entire cylinder's operation. The combination of mechanical and electrical limits enhances safety and reliability, ensuring the electric cylinder operates within its set range.

[0013] In addition, the buffer washer can prevent the disc spring baffle from colliding hard with the cylinder head plate, thus preventing damage.

[0014] Furthermore, it also includes a centrifugal brake for limiting the speed of the ball screw, which is sleeved on the ball screw. This brake automatically applies when the ball screw speed is too high, preventing loss of control or damage due to inertia and improving safety.

[0015] Furthermore, the centrifugal brake is located on the end face of the bearing housing, close to the reducer. This proximity optimizes spatial layout, reduces braking delay, and improves response speed.

[0016] Furthermore, the bearing housing end face is provided with a first step for positioning and installing the centrifugal brake, and the ball screw is provided with a second step for positioning and installing the centrifugal brake. The positioning and installation with the first and second steps can ensure that the centrifugal brake is installed firmly, avoid displacement due to vibration or impact, and improve braking reliability.

[0017] Furthermore, the ball screw is connected to the reducer output shaft via a coupling, and an adapter flange is provided between the reducer and the bearing housing, located outside the coupling. The coupling improves transmission accuracy, reduces axial and radial deviations, and minimizes wear. The adapter flange protects the coupling from external interference or contamination, thus improving transmission stability.

[0018] Furthermore, the first limit switch assembly and the second limit switch assembly each include a limit switch mounting base mounted on the cylinder barrel. The limit switch mounting base has a built-in limit switch, and a limit switch protective cover is installed on the upper surface of the limit switch mounting base. The limit switch protective cover can prevent dust, oil, and other contaminants from affecting the sensitivity of the limit switch, improving its long-term reliability.

[0019] Furthermore, a waterproof connector is installed on the end face of the limit switch protective cover. The waterproof connector enhances the waterproof and dustproof capabilities of the limit switch, making it suitable for harsh environments and improving its durability.

[0020] Furthermore, it also includes a hand crank for easy manual operation of the electric cylinder. A motor cover is located at the end of the motor away from the reducer, and a limit post is provided on the motor end face to limit the hand crank's movement. The hand crank can be manually operated in case of power failure or emergency, improving the equipment's emergency response capability.

[0021] Furthermore, the piston rod assembly includes a piston rod connected to a lead screw nut and a rod head connected to the end of the piston rod extending out of the cylinder cover plate.

[0022] Furthermore, the limiting sleeve is a T-shaped hollow sleeve, which can optimize structural strength, facilitate the installation and limiting of the disc spring assembly, and improve overall stability.

[0023] The beneficial effects of this utility model are as follows: This utility model has a simple structure and reasonable design, and has the following advantages:

[0024] (1) The first limit switch assembly and the second limit switch assembly are electrical limit assemblies, which can sense the position of the disc spring baffle and thus control the motor brake. After power failure, the electrical limit assembly fails. At this time, the right end of the limit sleeve acts as the upper mechanical limit and the buffer washer acts as the lower mechanical limit, thereby ensuring the reliability of the cylinder action. The combination of mechanical limit and electrical limit provides double limit, thereby improving safety and reliability and ensuring that the electric cylinder operates within the set range.

[0025] (2) When the ball screw speed is too high, the centrifugal brake will automatically brake to prevent loss of control or damage due to inertia and improve safety.

[0026] (3) It is equipped with a hand crank, which enables the electric cylinder to work normally even when the power is off, thus improving the emergency response capability of the electric cylinder. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 yes Figure 1 A sectional view;

[0030] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0031] In the diagram: 1. Hand crank, 2. Motor, 3. Reducer, 4. Adapter flange, 5. Coupling, 6. Centrifugal brake, 7. Bearing housing, 8. Limit sleeve, 9. Cylinder, 10. Disc spring assembly, 11. Ball screw, 12. Limit switch mounting base, 13. Limit switch protective cover, 14. Waterproof connector, 15. Limit switch, 16. Buffer ring, 17. Disc spring baffle, 18. Piston rod, 19. Rod head, 20. Motor cover, 21. Cylinder cover plate, 22. Screw nut. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1

[0036] like Figures 1-3 The energy storage electric cylinder shown includes an electric cylinder assembly and a drive assembly for driving the electric cylinder assembly. The drive assembly includes a motor 2 whose output shaft is connected to a reducer 3; the electric cylinder assembly includes a cylinder barrel 9, with bearing seats 7 and a cylinder cover plate 21 respectively at both ends of the cylinder barrel 9, the bearing seats 7 being located close to the reducer 3; a ball screw 11 is built into the cylinder barrel 9, one end of the ball screw 11 passing through the bearing seat 7 and connected to the output shaft of the reducer 3; the ball screw 11 is then fitted with... The cylinder is equipped with a limiting sleeve 8, a disc spring baffle 17, and a lead screw nut 22. The ball screw 11 is threadedly connected to the lead screw nut 22. The limiting sleeve 8 is located near the bearing seat 7 and one end of the limiting sleeve 8 is in contact with the inner wall of the cylinder 9. A disc spring assembly 10 is installed outside the limiting sleeve 8. One end of the disc spring assembly 10 abuts against the limiting sleeve 8, and the other end of the disc spring assembly 10 abuts against the disc spring baffle 17. The disc spring baffle 17 is connected to the lead screw nut 22, and a piston rod assembly that extends out of the cylinder cover plate 21 is installed outside the lead screw nut 22.

[0037] A buffer ring 16 is installed on the inner side of the cylinder cover plate 21.

[0038] The cylinder 9 is equipped with a first limit switch assembly and a second limit switch assembly at the position of the sensing disc spring baffle 17. The first limit switch assembly and the second limit switch assembly are arranged back and forth along the movement direction of the piston rod assembly (i.e., the first limit switch assembly is located to the left of the second limit switch assembly). The cylinder 9 and the bearing housing 7 are connected by screws.

[0039] This energy storage electric cylinder with braking and mechanical limiting also includes a centrifugal brake 6 for limiting the rotational speed of the ball screw 11. The centrifugal brake 6 is sleeved on the ball screw 11. The centrifugal brake 6 is located on the end face of the bearing housing 7, close to the reducer 3. The end face of the bearing housing 7 has a first step for positioning and installing the centrifugal brake 6, and the ball screw 11 has a second step for positioning and installing the centrifugal brake 6. The positioning and installation of the first and second steps can ensure that the centrifugal brake 6 is installed firmly, avoids displacement due to vibration or impact, and improves braking reliability.

[0040] The ball screw 11 is connected to the output shaft of the reducer 3 via a coupling 5. A transition flange 4 is provided between the reducer 3 and the bearing housing 7, and the transition flange 4 is located outside the coupling 5.

[0041] The first limit switch assembly and the second limit switch assembly each include a limit switch mounting base 12 mounted on the cylinder 9. The limit switch mounting base 12 has a built-in limit switch 15, and a limit switch protective cover 13 is mounted on the upper surface of the limit switch mounting base 12. A waterproof connector 14 is mounted on the end face of the limit switch protective cover 13.

[0042] This energy storage electric cylinder with braking and mechanical limiting also includes a hand crank 1 for easy manual operation of the electric cylinder. A motor cover 20 is provided at the end of the motor 2 away from the reducer 3, and a limiting post is provided on the end face of the motor 2 to limit the hand crank 1. The motor cover 20 is threaded onto the end of the motor 2 for easy disassembly.

[0043] The piston rod assembly includes a piston rod 18 connected to a lead screw nut 22. After extending out of the cylinder cover plate 21, the piston rod 18 is connected to a rod head 19. The disc spring baffle 17, piston rod 18, and lead screw nut 22 are connected as a whole by screws. The piston rod 18 and rod head 19 are threaded together, which facilitates the replacement of the rod head 19 and makes maintenance convenient.

[0044] Limit sleeve 8 is a T-shaped hollow sleeve.

[0045] Specifically, taking this embodiment as an example, the working process of this energy storage electric cylinder with braking and mechanical limiting is as follows:

[0046] (1) Normal operation: When motor 2 is powered on, the motor shaft rotates and drives the ball screw 11 to rotate, thereby driving the piston rod 18 to reciprocate along the axial direction. During the retraction process of piston rod 18, disc spring baffle 17 will compress disc spring assembly 10, thereby storing energy in disc spring assembly 10. After reaching the upper limit, the limit switch 15 on the left will sense disc spring baffle 17 and send a signal to the host computer, and motor 2 will brake and lock the motor shaft. Similarly, when piston rod 18 extends, disc spring assembly 10 releases energy. When it reaches the lower limit, the limit switch 15 on the right will send feedback information to the host computer, and motor 2 will brake and lock the motor shaft.

[0047] (2) Power failure protection: If the motor 2 suddenly loses power or malfunctions during the retraction of the piston rod 18, the force stored in the disc spring assembly 10 will be released instantly, pushing the piston rod 18 to extend faster, thereby accelerating the rotation of the ball screw 11. When the speed of the ball screw 11 reaches the critical speed of the centrifugal brake 6, the centrifugal brake 6 will open, thereby limiting the speed of the ball screw 11, i.e. the extension speed of the piston rod 18, to ensure safe use. In the power failure state, both the first limit switch assembly and the second limit switch assembly fail, i.e., the electrical limit fails. At this time, the right end of the limit sleeve 8 acts as the upper mechanical limit, and the buffer ring 16 acts as the lower mechanical limit, thereby ensuring the reliability of the cylinder action.

[0048] (3) Power off operation, enter manual operation mode, remove motor cover 20, connect hand crank 1 to motor shaft. Since motor 2 has no brake device, the motor shaft can be easily rotated by hand crank 1, thereby controlling the extension and retraction of piston rod 18. When piston rod 18 extends to the predetermined position, hand crank 1 can be locked in the limiting post (not shown in the figure) at the tail of motor 2 to restrict the motor shaft from reversing in the energy storage state of disc spring assembly 10. This structure can realize the control of various movement states of piston rod 18 even when power is off.

[0049] In summary, this utility model has a simple structure and achieves power-off protection, reliable limiting, and power-off operation of the electric cylinder through a built-in centrifugal brake, a double limit structure, and a disc spring energy storage mechanism.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An energy storage electric cylinder with brake and mechanical limit, characterized in that: It includes an electric cylinder assembly and a drive assembly for driving the electric cylinder assembly. The drive assembly includes a motor (2) and a reducer (3) is connected to the output shaft of the motor (2). The electric cylinder assembly includes a cylinder (9), with bearing seats (7) and cylinder cover plates (21) respectively provided at both ends of the cylinder (9). The bearing seats (7) are located close to the reducer (3). The cylinder (9) contains a ball screw (11), with one end of the ball screw (11) passing through the bearing seat (7) and connected to the output shaft of the reducer (3). The ball screw (11) is fitted with a limiting sleeve (8), a disc spring baffle (17) and a screw nut (22) in sequence. The ball screw (11) and the screw nut (22) are threaded together. The limiting sleeve (8) is located near the bearing seat (7) and one end of the limiting sleeve (8) is in contact with the inner wall of the cylinder (9). The limiting sleeve (8) is fitted with a disc spring assembly (10). One end of the disc spring assembly (10) abuts against the limiting sleeve (8) and the other end of the disc spring assembly (10) abuts against the disc spring baffle (17). The disc spring baffle (17) and the screw nut (22) are connected. The screw nut (22) is fitted with a piston rod assembly that extends out of the cylinder cover plate (21).

2. The energy storage electric cylinder with braking and mechanical limiting according to claim 1, characterized in that: A buffer ring (16) is installed on the inner side of the cylinder cover plate (21).

3. The energy-storing electric cylinder with brake and mechanical limit according to claim 1, characterized in that: The cylinder (9) is provided with a first limit switch assembly and a second limit switch assembly at the position of the sensing disc spring baffle (17). The first limit switch assembly and the second limit switch assembly are arranged back and forth along the movement direction of the piston rod assembly.

4. The energy-storing electric cylinder with brake and mechanical limit according to claim 1, characterized in that: It also includes a centrifugal brake (6) for limiting the rotational speed of the ball screw (11), the centrifugal brake (6) being sleeved on the ball screw (11); The centrifugal brake (6) is located on the end face of the bearing seat (7) and is positioned close to the reducer (3).

5. The energy-storing electric cylinder with brake and mechanical limit according to claim 4, characterized in that: The bearing housing (7) has a first step on its end face for positioning and installing the centrifugal brake (6), and the ball screw (11) has a second step on its end face for positioning and installing the centrifugal brake (6).

6. The energy-storing, electric cylinder with mechanical and brake limiting according to claim 1, characterized in that: The ball screw (11) is connected to the output shaft of the reducer (3) via a coupling (5). A transition flange (4) is provided between the reducer (3) and the bearing housing (7), and the transition flange (4) is located outside the coupling (5).

7. An energy storage electric cylinder with braking and mechanical limiting according to claim 3, characterized in that: The first limit switch assembly and the second limit switch assembly each include a limit switch mounting base (12) mounted on the cylinder (9), a limit switch (15) built into the limit switch mounting base (12), and a limit switch protective cover (13) mounted on the upper surface of the limit switch mounting base (12).

8. An energy storage electric cylinder with braking and mechanical limiting according to claim 7, characterized in that: A waterproof connector (14) is installed on the end face of the limit switch protective cover (13).

9. The energy storage electric cylinder with braking and mechanical limiting according to claim 1, characterized in that: It also includes a hand crank (1) for easy manual operation of the electric cylinder, a motor cover (20) at the end of the motor (2) away from the reducer (3), and a limit post on the end face of the motor (2) to limit the hand crank (1).

10. The energy-storing, electric cylinder with mechanical and brake limiting according to claim 1, characterized in that: The piston rod assembly includes a piston rod (18) connected to a lead screw nut (22) and a rod head (19) connected to the end of the piston rod (18) extending out of the cylinder cover plate (21).

11. The energy-storing, electric cylinder with mechanical and brake limiting according to claim 1, characterized in that: The limiting sleeve (8) is a T-shaped hollow sleeve.

Images