Electric cylinder with new anti-rotation structure

Abstract

This utility model discloses a novel anti-rotation structure for an electric cylinder, comprising: a motor with a cylinder body fixedly mounted on the left side of its housing; a support bearing fixedly fitted inside the right side of the cylinder body; a ball screw fixedly fitted inside the inner ring of the support bearing and installed with the output shaft of the motor; a screw nut threaded onto the ball screw; an anti-wear anti-rotation component installed between the inner side of the cylinder body and the outer side of the screw nut; a nut sleeve fixedly fitted onto the outer side of the screw nut; and a piston rod fixedly connected to the left side of the nut sleeve. This utility model, through a series of structures, facilitates anti-rotation and anti-wear guidance for the screw nut and piston rod. By combining the anti-rotation and anti-wear guidance of the screw nut with the anti-wear guidance of the piston rod, it avoids the phenomenon of reduced accuracy caused by wear during long-term use of traditional sliding friction guides, reducing friction loss and improving long-term accuracy and lifespan.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder technology, specifically to a novel anti-rotation structure for an electric cylinder. Background Technology

[0002] With the popularization of permanent magnet synchronous motors, electric cylinders are being accepted in more and more occasions. They are favored for their high precision, controllable speed, torque and position, as well as energy saving, environmental protection and ease of use.

[0003] Because electric cylinders use ball screws and are equipped with nut sleeves and guide mechanisms to ensure smooth linear movement of the piston rod, and their guide mechanisms employ anti-rotation sliding friction, they are easy to install due to their small size. However, the following problems exist during use:

[0004] Because of the sliding friction guiding mechanism, the anti-rotation guiding mechanism suffers severe wear after prolonged operation. As the wear increases, the accuracy deteriorates, thus affecting the accuracy and lifespan. Therefore, the accuracy and lifespan are low after long-term use. In view of this, this application proposes a new type of anti-rotation structure for electric cylinders to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a novel anti-rotation structure for an electric cylinder to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel anti-rotation structure for an electric cylinder, comprising:

[0007] The motor has a cylinder fixedly mounted on the left side of its housing.

[0008] The support bearing is fixedly mounted on the inner right side of the cylinder block;

[0009] The ball screw is fixedly sleeved inside the inner ring of the support bearing and installed with the output shaft of the motor;

[0010] A lead screw nut is threaded onto a ball screw.

[0011] The anti-wear anti-rotation component is installed between the inner side of the cylinder body and the outer side of the lead screw nut; the anti-wear anti-rotation component is used to limit the rotation of the lead screw nut and to provide anti-wear lateral guidance during its lateral movement;

[0012] Nut sleeve, fixedly sleeved on the outside of the lead screw nut;

[0013] The piston rod is fixedly connected to the left side of the nut sleeve;

[0014] The linear guide assembly is fixedly installed on the left side of the cylinder body and movably sleeved on the piston rod; the linear guide assembly is used to guide the piston rod laterally during its transverse movement.

[0015] The threaded connector is fixedly connected to the left side of the piston rod.

[0016] Preferably, the anti-wear anti-rotation component includes anti-rotation balls, which are movably embedded in the top and bottom of the lead screw nut. There may be one or more anti-rotation balls located at the top and bottom of the lead screw nut. Arc-shaped anti-rotation grooves are provided on the top inner wall and bottom inner wall of the cylinder body. The outer side of the anti-rotation ball is in movable contact with the inner wall of the corresponding arc-shaped anti-rotation groove.

[0017] Preferably, the linear guide assembly includes a front end cover fixedly connected to the left side of the cylinder body, and a linear bearing is fixedly sleeved inside the front end cover, with the inner side of the linear bearing in movable contact with the outer side of the piston rod.

[0018] Preferably, a coupling is fixedly connected between the left end of the motor's output shaft and the right end of the ball screw, and the ball screw is installed to the motor's output shaft through the coupling.

[0019] Preferably, the outer side of the nut sleeve and the outer side of the lead screw nut do not contact the inner side of the cylinder body.

[0020] Preferably, the piston rod has a relief groove at its right end, and the ball screw is located in the relief groove and does not contact the inner wall of the relief groove.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. By using a motor, coupling, ball screw, nut sleeve, piston rod, cylinder and anti-wear anti-rotation component, the anti-rotation balls can roll laterally in the arc-shaped anti-rotation groove, and the arc-shaped anti-rotation groove restricts the rotation of the screw nut through the anti-rotation balls. When the motor drives the ball screw to rotate and controls the lateral movement of the screw nut, the effect of preventing the screw nut from rotating and preventing wear is achieved.

[0023] 2. By setting up a linear guide component, wear-resistant transverse guides are implemented for the piston rod; by cooperating with the anti-rotation and anti-wear transverse guides for the lead screw nut to prevent wear and reduce accuracy caused by the wear of traditional sliding friction guides during long-term use, friction loss is reduced, and long-term accuracy and lifespan are improved.

[0024] This utility model incorporates a series of structures to facilitate anti-rotation and anti-wear guides for the lead screw nut and piston rod. By combining the anti-rotation and anti-wear guides for the lead screw nut with the anti-wear guides for the piston rod, it avoids the phenomenon of reduced accuracy caused by wear during long-term use of traditional sliding friction guides, thereby reducing friction loss and improving long-term accuracy and lifespan. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of an electric cylinder with a novel anti-rotation structure proposed in this utility model;

[0026] Figure 2 This is a right-side structural schematic diagram of an electric cylinder with a novel anti-rotation structure proposed in this utility model.

[0027] Figure 3 This utility model presents a schematic diagram of the cylinder body, lead screw nut, ball screw, anti-rotation balls, and arc-shaped anti-rotation groove connecting parts of an electric cylinder with a novel anti-rotation structure. (Right view sectional view)

[0028] In the diagram: 1. Motor; 2. Coupling; 3. Support bearing; 4. Nut sleeve; 5. Ball screw; 6. Piston rod; 7. Cylinder body; 8. Linear bearing; 9. Front end cover; 10. Threaded joint; 11. Arc-shaped anti-rotation groove; 12. Anti-rotation ball; 13. Screw nut. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 3 As shown in this embodiment, a novel anti-rotation structure for an electric cylinder includes:

[0031] Motor 1, with cylinder 7 fixedly mounted on the left side of its housing;

[0032] Support bearing 3 is fixedly mounted on the inner right side of cylinder body 7;

[0033] The ball screw 5 is fixedly sleeved in the inner ring of the support bearing 3 and installed with the output shaft of the motor 1. The support bearing 3 provides rotational support for the ball screw 5. A coupling 2 is fixedly connected between the left end of the output shaft of the motor 1 and the right end of the ball screw 5. The ball screw 5 is installed with the output shaft of the motor 1 through the coupling 2.

[0034] The lead screw nut 13 is threaded onto the ball screw 5;

[0035] The anti-wear anti-rotation component is installed between the inner side of the cylinder 7 and the outer side of the lead screw nut 13; the anti-wear anti-rotation component is used to limit the rotation of the lead screw nut 13 and to perform anti-wear lateral guidance work when it moves laterally.

[0036] Nut sleeve 4 is fixedly sleeved on the outside of lead screw nut 13. Neither the outside of nut sleeve 4 nor the outside of lead screw nut 13 is in contact with the inside of cylinder body 7.

[0037] The piston rod 6 is fixedly connected to the left side of the nut sleeve 4. A clearance groove is provided at the right end of the piston rod 6. The ball screw 5 is located in the clearance groove and does not contact the inner wall of the clearance groove, which achieves the effect of clearance at the end of the ball screw 5 while ensuring a small size.

[0038] A linear guide assembly is fixedly installed on the left side of the cylinder body 7 and movably sleeved on the piston rod 6; the linear guide assembly is used to guide the piston rod 6 laterally when it moves laterally.

[0039] Threaded connector 10 is fixedly connected to the left side of piston rod 6.

[0040] Specifically, the anti-wear anti-rotation component includes anti-rotation balls 12, which are movably embedded in the top and bottom of the lead screw nut 13. There can be one or more anti-rotation balls 12 located at the top and bottom of the lead screw nut 13. Arc-shaped anti-rotation grooves 11 are provided on the inner walls of the top and bottom of the cylinder body 7. The outer side of the anti-rotation ball 12 is in contact with the inner wall of the corresponding arc-shaped anti-rotation groove 11. The anti-rotation ball 12 and the arc-shaped anti-rotation groove 11 cooperate with each other. By using the anti-rotation ball 12 to be movably attached to the arc-shaped anti-rotation groove 11, the circumferential restriction effect of the lead screw nut 13 is achieved, thus achieving the anti-rotation restriction function of the lead screw nut 13. When the lead screw nut 13 moves laterally, it drives the anti-rotation ball 12 to roll laterally in the corresponding arc-shaped anti-rotation groove 11. By using the anti-rotation ball 12 to roll along the corresponding arc-shaped anti-rotation groove 11, the direct horizontal friction phenomenon is avoided, thus achieving the effect of anti-wear lateral guidance.

[0041] Furthermore, the linear guide assembly includes a front end cover 9 fixedly connected to the left side of the cylinder body 7. A linear bearing 8 is fixedly sleeved inside the front end cover 9, and the inner side of the linear bearing 8 is in movable contact with the outer side of the piston rod 6. The front end cover 9 and the linear bearing 8 cooperate to fix and support the linear bearing 8. Since the inner side of the linear bearing 8 has multiple steel balls, the multiple steel balls on the inner side of the linear bearing 8 are used to prevent wear and provide lateral guidance when the piston rod 6 moves laterally.

[0042] The usage method of this embodiment is as follows: When the electric cylinder with the novel anti-rotation structure is in use, when the motor 1 starts and drives the ball screw 5 to rotate through the coupling 2, the rotation of the ball screw 5 causes the screw nut 13 to move laterally. The anti-rotation balls 12 are movably engaged in the arc-shaped anti-rotation groove 11, achieving the effect of circumferential restriction on the screw nut 13, thus achieving anti-rotation restriction of the screw nut 13. During the lateral movement of the screw nut 13, the anti-rotation balls 12 are driven to roll laterally within the corresponding arc-shaped anti-rotation groove 11. By utilizing the rolling displacement of the anti-rotation balls 12 along the corresponding arc-shaped anti-rotation groove 11, direct horizontal friction is avoided, thus achieving anti-rotation restriction of the screw nut 13. The anti-wear lateral guide effect of the rotating screw nut 13 is achieved by using the nut sleeve 4 to drive the piston rod 6 to move laterally within the linear bearing 8 when the screw nut 13 moves laterally. The piston rod 6 then drives the threaded joint 10 to move laterally. After the external load is connected to the threaded joint 10, it can drive the load to move linearly. Since the linear bearing 8 has multiple steel balls on its inner side, the multiple steel balls on the inner side of the linear bearing 8 are used to prevent wear and provide lateral guidance for the piston rod 6 when it moves laterally. By combining the anti-rotation and anti-wear lateral guide of the screw nut 13 with the anti-wear lateral guide of the piston rod 6, the phenomenon of easy wear and reduced accuracy caused by traditional sliding friction guides during long-term use is avoided. This reduces friction loss and improves long-term accuracy and lifespan.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel anti-rotation structure for an electric cylinder, comprising a motor (1), characterized in that: include: The motor (1) has a cylinder (7) fixedly installed on the left side of its housing; Support bearing (3) is fixedly mounted on the inner right side of cylinder body (7); The ball screw (5) is fixedly sleeved in the inner ring of the support bearing (3) and installed with the output shaft of the motor (1); The screw nut (13) is threaded onto the ball screw (5); The wear-resistant anti-rotation component is installed between the inner side of the cylinder body (7) and the outer side of the lead screw nut (13); Nut sleeve (4) is fixedly sleeved on the outside of the screw nut (13); The piston rod (6) is fixedly connected to the left side of the nut sleeve (4); The linear guide assembly is fixedly installed on the left side of the cylinder (7) and movably sleeved on the piston rod (6); The threaded connector (10) is fixedly connected to the left side of the piston rod (6).

2. The electric cylinder with a novel anti-rotation structure according to claim 1, characterized in that: The anti-wear anti-rotation component includes anti-rotation balls (12), which are movably embedded in the top and bottom of the lead screw nut (13). There can be one or more anti-rotation balls (12) at the top and bottom of the lead screw nut (13). Arc-shaped anti-rotation grooves (11) are provided on the top inner wall and bottom inner wall of the cylinder (7). The outer side of the anti-rotation ball (12) is in contact with the inner wall of the corresponding arc-shaped anti-rotation groove (11).

3. The electric cylinder with a novel anti-rotation structure according to claim 1, characterized in that: The linear guide assembly includes a front end cover (9) fixedly connected to the left side of the cylinder (7), and a linear bearing (8) is fixedly sleeved inside the front end cover (9). The inner side of the linear bearing (8) is in contact with the outer side of the piston rod (6).

4. The electric cylinder with a novel anti-rotation structure according to claim 1, characterized in that: A coupling (2) is fixedly connected between the left end of the output shaft of the motor (1) and the right end of the ball screw (5). The ball screw (5) is installed with the output shaft of the motor (1) through the coupling (2).

5. The electric cylinder with a novel anti-rotation structure according to claim 1, characterized in that: The outer side of the nut sleeve (4) and the outer side of the lead screw nut (13) do not contact the inner side of the cylinder body (7).

6. The electric cylinder with a novel anti-rotation structure according to claim 1, characterized in that: The piston rod (6) has a clearance groove at its right end, and the ball screw (5) is located in the clearance groove and does not contact the inner wall of the clearance groove.

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