Electric push rod

Abstract

The utility model discloses an electric push rod, and belongs to the technical field of furniture electrical equipment. Comprising a housing; the motor is arranged on the shell; the sleeve is arranged on the machine shell; the limiting cover body is arranged on the sleeve; the transmission assembly is movably arranged in the sleeve in a penetrating manner through a limiting cover body; a worm and a worm gear are arranged in the machine shell. The transmission assembly comprises a lead screw rotationally arranged in the sleeve, a threaded sleeve arranged on the lead screw and matched with the lead screw in a threaded mode, an inner rod connected with the threaded sleeve, a first buffering pad arranged in the machine shell and a second buffering pad arranged in the limiting cover body, and the inner rod is arranged on the limiting cover body in a sliding and penetrating mode. The first buffer pad and the second buffer pad are located at the two ends of the lead screw respectively. The electric push rod has the beneficial effect that the electric push rod capable of improving rotation control over the lead screw is provided.

Description

Technical Field

[0001] The present application relates to the technical field of furniture electrical equipment, and in particular to an electric push rod. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It can purify the fumes that are harmful to the human body produced during the cooking process, providing a guarantee for people's physical safety. Due to the high fume absorption rate of range hoods, range hoods are being used more and more widely.

[0003] The switch of the smoke screen on the range hood usually requires the assistance of an electric push rod. The smoke screen rotates around the connection point when it is opened, and the electric push rod generally performs linear reciprocating motion. The electric push rod is directly connected to the smoke screen. After the existing electric push rod moves to the limit of its stroke, the motor stops working through a micro switch, thereby controlling the stroke of the push rod. Since the range hood is in an environment where oil smoke is constantly present, the micro switch is easily affected by the oil smoke, which reduces the sensitivity of the micro switch and easily causes damage to the range hood. Utility Model Content

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide an electric linear actuator, including:

[0006] chassis;

[0007] A motor is arranged on the casing;

[0008] A sleeve, provided on the casing;

[0009] A limit cover body is arranged on the sleeve;

[0010] The transmission component is movably arranged in the sleeve through the limiting cover body;

[0011] A worm and a worm wheel are arranged in the casing;

[0012] The transmission assembly includes a lead screw rotatably arranged in a sleeve and fixedly connected to a worm gear at one end, a threaded sleeve arranged on the lead screw and cooperating with the thread of the lead screw, an inner rod connected to the threaded sleeve, a first buffer pad arranged in a casing, and a second buffer pad arranged in a limiting cover body. The inner rod is slidably penetrated through the limiting cover body, and the first buffer pad and the second buffer pad are respectively located on the two ends of the lead screw.

[0013] The motion process of the present application: the vertical rotation direction A of the motor is converted into the horizontal rotation direction B through the worm gear structure principle, the rotation of the worm gear drives the screw to rotate synchronously, and the rotational motion is converted into the straight wire direction C motion through the threaded engagement principle of the screw sleeve and the screw, and the movement of the screw sleeve drives the inner rod to move linearly at the same time, thereby realizing the required function. When the screw sleeve contacts the first buffer pad or the second buffer pad, the first and second buffer pads are slightly deformed, which hinders the movement of the screw sleeve, reduces the force, and hinders the rotation of the screw sleeve when the screw sleeve cannot continue to move, and the motor output shaft cannot rotate, causing the motor temperature to rise. After detecting the increase in the motor temperature, the electric control board stops the motor from working, avoiding the motor from being damaged by continuous heat generation, thereby avoiding the collision between the screw sleeve and the casing or the limit cover; the micro switch drive in the prior art is replaced by the buffer pad to control the rotation of the screw, avoiding the influence of oil smoke on the micro switch, reducing the cost of the electric push rod, making the electric push rod easier to install, and ensuring the reliability of information transmission. Therefore, when the self-locking is locked, the reverse operation may be locked because it is rotating independently without limit matching. Once locked, the device cannot be driven. The first buffer pad or the second buffer pad has a buffering effect on the nut, reducing the force and preventing blocking.

[0014] Furthermore, a receiving groove is provided in the casing, and the transmission assembly also includes a bearing installed in the receiving groove, and one end of the screw rod is inserted into the bearing.

[0015] Furthermore, the bearing is interference fit with the side wall of the accommodating groove.

[0016] Furthermore, the casing and the sleeve are connected by means of screws, and the screws are located inside the casing.

[0017] Furthermore, the sleeve and the limiting cover are connected by means of screws.

[0018] Furthermore, the number of teeth of the worm gear is 18.

[0019] Furthermore, a connecting rod is threadedly connected on one end of the inner rod.

[0020] Furthermore, it also includes a connecting plate, a fixing frame, and a fixing rod; the fixing frame is fixed to the casing by screws, the fixing rod is fixed to the fixing frame, a through hole is opened on the fixing rod, and the connecting plate is fixed to the fixing rod by a pin.

[0021] The beneficial effect of the present application is that it provides an electric push rod that improves the control over the rotation of the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0023] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0024] In the attached picture:

[0025] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0026] Figure 2 It is an exploded view;

[0027] Figure 3 is a cross-sectional view of an embodiment of the present application;

[0028] Figure 4 It is another embodiment of the present application.

[0029] Reference numerals:

[0030] 1. Casing; 2. Motor; 3. Sleeve; 4. Limiting cover; 5. Transmission assembly; 6. Worm; 7. Worm wheel; 8. Inner rod; 9. Screw; 10. Screw sleeve; 11. First buffer pad; 12. Second buffer pad; 13. Accommodating groove; 14. Bearing; 15. Connecting rod; 16. Connecting plate; 17. Fixing frame; 18. Fixing rod; 19. Through hole; 20. Latch; 21. Connecting ring. DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0032] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0033] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0034] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0035] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] Reference Figure 1-4 The electric push rod includes a casing 1, a motor 2, a sleeve 3, a limit cover 4, and a transmission assembly 5; the motor 2 is fixed on the casing 1, one end of the sleeve 3 is fixed on one side of the casing 1, the limit cover 4 is fixed on the other end of the sleeve 3, and the transmission assembly 5 is movably inserted into the sleeve 3 through the limit cover 4.

[0037] The casing 1 is connected to the sleeve 3 by screws. The sleeve 3 is connected to the limit cover 4 by screws, and the screws are located inside the casing.

[0038] The motor 2 is vertically mounted on the housing 1 by screws.

[0039] A worm 6 and a worm wheel 7 are provided in the casing 1 ; the worm 6 is provided on the output end of the motor 2 , the turbine is rotatably provided in the casing 1 and meshes with the worm 6 , and the transmission assembly 5 is in transmission cooperation with the worm wheel 7 .

[0040] The worm wheel 7 has 18 teeth.

[0041] The transmission assembly 5 includes an inner rod 8, a screw rod 9, a threaded sleeve 10, a first buffer pad 11, and a second buffer pad 12; the screw rod 9 is rotatably located in the sleeve 3 and one end is fixedly connected to the worm gear 7, the threaded sleeve 10 is arranged on the screw rod 9 and slidably cooperates with the screw rod 9, the inner rod 8 is arranged as a hollow tube, the inner rod 8 is slidably arranged on the limit cover body 4, and one end is threadedly connected with the threaded sleeve 10, the inner rod 8 is slidably arranged in the sleeve 3 through the threaded sleeve 10 and the screw rod 9, the first buffer pad 11 and the second buffer pad 12 are respectively sleeved on the two ends of the screw rod 9, and the first buffer pad 11 is installed in the casing 1, and the second buffer pad 12 is installed in the limit cover body 4. When the screw sleeve 10 contacts the first buffer pad 11 or the second buffer pad 12, the first and second buffer pads 12 are slightly deformed, which hinders the movement of the screw sleeve 10 and reduces the force, so that the screw sleeve 10 cannot continue to move, which hinders the rotation of the screw rod 9. The output shaft of the motor 2 cannot rotate, causing the temperature of the motor 2 to rise. After detecting the temperature rise of the motor 2, the electric control board stops the motor 2 to avoid the motor 2 from being damaged by the continuous heat generation of the motor 2, thereby avoiding the collision between the screw sleeve 10 and the housing 1 or the limit cover 4; the micro switch drive in the prior art is replaced by the buffer pad to control the rotation of the screw rod 9, avoiding the influence of oil smoke on the micro switch, reducing the cost of the electric push rod, making the electric push rod easier to install, and ensuring the reliability of information transmission. Therefore, when the self-locking is locked, it may be locked when running in the reverse direction because it is a single rotation without limit matching, and once locked, the device cannot be driven. Under the action of the first buffer pad 11 or the second buffer pad 12, a buffering effect is played on the nut, reducing the force, and playing an anti-blocking effect.

[0042] The housing 1 is provided with a receiving groove 13, and the transmission assembly 5 further includes a bearing 14; the bearing 14 is sleeved on the screw rod 9 and is located in the receiving groove 13, and the first buffer pad 11 is located on one end close to the bearing 14. The bearing 14 is installed in the receiving groove 13 by riveting, and the bearing 14 and the side wall of the receiving groove 13 are interference fit.

[0043] A connecting rod 15 is threadedly connected to one end of the inner rod 8, and is connected to the smoke screen on the range hood via the connecting rod 15, so that the opening or closing of the smoke screen is controlled by the movement of the inner rod 8.

[0044] In other embodiments, a connecting ring 21 is provided on the inner rod 8, and is connected to the smoke screen on the range hood via the connecting ring 21.

[0045] It also includes a connecting plate 16, a fixing frame 17, and a fixing rod 18; the fixing frame 17 is fixed to the housing 1 by screws, the fixing rod 18 is fixed to the fixing frame 17, a through hole 19 is opened on the fixing rod 18, and the connecting plate 16 is fixed to the fixing rod 18 by a pin 20.

[0046] The specific operation method is as follows:

[0047] The vertical rotation direction A of the motor 2 is converted into a horizontal rotation direction B through the structural principle of the worm 6 and worm wheel 7. The rotation of the worm wheel 7 drives the screw 9 to rotate synchronously. The rotational motion is converted into a straight line direction C motion through the threaded engagement principle of the screw sleeve 10 and the screw 9. The movement of the screw sleeve 10 drives the inner rod 8 to move in a straight line at the same time, thereby realizing the required function.

[0048] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. An electric linear actuator, comprising: chassis; A motor, arranged on the housing; A sleeve, disposed on the housing; A limiting cover body is arranged on the sleeve; A transmission assembly is movably arranged in the sleeve through the limiting cover body; Features: A worm and a worm wheel are arranged in the casing; The transmission assembly includes a screw that is rotatably arranged in the sleeve and has one end fixedly connected to the worm gear, a screw sleeve that is arranged on the screw and cooperates with the screw thread, an inner rod connected to the screw sleeve, a first buffer pad arranged in the casing, and a second buffer pad arranged in the limiting cover body. The inner rod is slidably penetrated on the limiting cover body, and the first buffer pad and the second buffer pad are respectively located on the two ends of the screw.

2. The electric linear actuator according to claim 1, characterized in that: A receiving groove is provided in the housing, and the transmission assembly further comprises a bearing installed in the receiving groove, and one end of the screw rod is inserted into the bearing.

3. The electric linear actuator according to claim 2, characterized in that: The bearing is interference fit with the side wall of the accommodating groove.

4. The electric linear actuator according to claim 1, characterized in that: The casing is connected to the sleeve by means of screws, and the screws are located inside the casing.

5. The electric linear actuator according to claim 1, characterized in that: The sleeve is connected to the limiting cover body by means of screws.

6. The electric linear actuator according to claim 1, characterized in that: The worm wheel has 18 teeth.

7. The electric linear actuator according to claim 1, characterized in that: One end of the inner rod is threadedly connected with a connecting rod.

8. The electric linear actuator according to claim 1, characterized in that: It also includes a connecting plate, a fixing frame, and a fixing rod; the fixing frame is fixed on the casing by screws, the fixing rod is fixed on the fixing frame, a through hole is opened on the fixing rod, and the connecting plate is fixed on the fixing rod by a latch.

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