Electric push rod capable of preventing rotation

Abstract

The utility model provides an anti-rotation electric push rod, and relates to the technical field of electric push rods. Comprising a shell, a transmission lead screw and a telescopic rod are arranged in the shell, the telescopic rod is arranged in the transmission lead screw in a sleeved mode so as to be suitable for stretching out and drawing back in the axial direction of the shell, and an anti-rotation sleeve installed on the outer side of the telescopic rod is arranged in the shell. The anti-rotation sleeve is configured to limit the telescopic rod to rotate around the central axis of the transmission lead screw. According to the scheme, the stability of the electric push rod can be higher.

Description

Technical Field

[0001] The utility model relates to the technical field of electric push rods, in particular to an electric push rod capable of preventing rotation. Background Art

[0002] An electric push rod is an electric drive device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. However, many electric push rods are currently large in size and cannot adapt to installation requirements in a small space, resulting in many product designs and R&D directions being unable to be realized. In addition, most current electric push rods use square shell materials, which are convenient for installation and positioning. However, the processing cost of a square metal shell is high, and the volume occupied is large at the same diameter and width, which is not conducive to application in a small space. Therefore, electric push rods with cylindrical shells have emerged. However, when the existing cylindrical electric push rods are telescopic, since the telescopic rod is generally also cylindrical, it is easy to shake or even rotate synchronously, resulting in instability of the telescopic rod when the electric push rod is telescoped along the axis, reducing the transmission efficiency of the motor. Utility Model Content

[0003] In view of this, an object of the present invention is to provide an anti-rotation electric push rod to solve the above problem.

[0004] The utility model adopts the following scheme: the application provides an anti-rotation electric push rod, including a shell, a transmission screw and a telescopic rod are arranged in the shell, the telescopic rod is sleeved in the transmission screw to be suitable for telescoping along the axial direction of the shell, and an anti-rotation sleeve installed on the outside of the telescopic rod is arranged in the shell, and the anti-rotation sleeve is configured to limit the telescopic rod from rotating around the central axis of the transmission screw.

[0005] Furthermore, at least one anti-rotation surface is provided in the anti-rotation sleeve, and a rotation-limiting surface matched with the anti-rotation surface is provided on the outer side surface of the telescopic rod.

[0006] Furthermore, two anti-rotation surfaces are provided, and the two anti-rotation surfaces are arranged opposite to each other on the inner wall of the anti-rotation sleeve.

[0007] Furthermore, the outer wall of the telescopic rod is provided with two rotation-limiting surfaces opposite to each other for cooperating with the two anti-rotation surfaces.

[0008] Furthermore, the anti-rotation sleeve is interference fit with the inner wall of the shell.

[0009] Furthermore, the anti-rotation sleeve comprises an upper anti-rotation sleeve and a lower anti-rotation sleeve which are detachably connected and matched with each other, and the upper anti-rotation sleeve and the lower anti-rotation sleeve are suitable for enclosing an anti-rotation space for accommodating the telescopic rod.

[0010] Furthermore, a screw nut is provided between the transmission screw and the telescopic rod, and the screw nut is threadedly connected to the transmission screw so as to move along the axial direction of the transmission screw when the transmission screw rotates, thereby driving the telescopic rod to perform telescopic work.

[0011] Furthermore, the transmission screw is connected to the drive motor through a coupling, and a bearing and a buffer pad are provided on the coupling. The buffer pad is arranged between the screw nut and the bearing so as to contact with the buffer pad to achieve buffering when the screw nut moves to the bottom.

[0012] Furthermore, the coupling is connected to the rotating shaft of the driving motor via a transmission pin.

[0013] Beneficial effects:

[0014] The present application sets an anti-rotation sleeve inside the housing to limit the rotation of the telescopic rod or the screw nut, so that the telescopic rod can only move along the axis of the transmission screw when it is extended and retracted, and will not rotate, thereby improving the stability of the telescopic rod when it is working. There is no need to design an anti-rotation nut at the end, so that the design length of the entire electric push rod can be further shortened to be suitable for a narrower environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structure diagram of an anti-rotation electric push rod according to an embodiment of the utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of the decomposition structure;

[0017] Figure 3 It is a schematic cross-sectional structure diagram of another anti-rotation electric push rod according to an embodiment of the utility model;

[0018] Figure 4 yes Figure 3 Schematic diagram of the decomposition structure;

[0019] Figure 5 It is a schematic structural diagram of another anti-rotation electric push rod according to an embodiment of the utility model;

[0020] Figure 6 yes Figure 5 Schematic diagram of the decomposition structure;

[0021] Figure numerals: housing 1, drive motor 2, transmission screw 3, telescopic rod 4, rotation limiting surface 41, guide sleeve 5, bearing 6, screw nut 7, buffer pad 8, coupling 9, transmission pin 10, anti-rotation sleeve 11, anti-rotation surface 111. DETAILED DESCRIPTION

[0022] Combination Figure 1 to Figure 2 As shown, this embodiment provides an anti-rotation electric push rod, including a shell 1, in which a transmission screw 3 and a telescopic rod 4 are arranged, and the telescopic rod 4 is sleeved in the transmission screw 3 to be suitable for telescoping along the axial direction of the shell 1, and an anti-rotation sleeve 11 installed on the outside of the telescopic rod 4 is arranged in the shell 1, and the anti-rotation sleeve 11 is configured to limit the telescopic rod 4 from rotating around the central axis of the transmission screw 3.

[0023] Combination Figures 1 to 6 As shown, in this embodiment, the electric push rod includes a housing 1, a driving motor 2, a transmission screw 3, a telescopic rod 4 and a guide sleeve 5, wherein the transmission screw 3 is connected to the output end of the driving motor 2, the telescopic rod 4 is threadedly connected to the transmission screw 3, and the guide sleeve 5 is arranged on the outer side of the telescopic rod 4 to provide a guiding effect when the telescopic rod 4 is telescoped; and a bearing 6 is arranged on the transmission screw 3. The housing 1 adopts a round tube shape to reduce the processing cost. In another embodiment, a screw nut 7 is further connected between the transmission screw 3 and the telescopic rod 4, and the screw nut 7 is used to be threadedly connected to the transmission screw 3. The telescopic rod 4 does not need to be provided with an internal thread. The telescopic rod 4 is telescoped by moving up and down in the axial direction of the transmission screw 3 through the screw nut 7, thereby reducing the power requirement required for driving the driving motor 2.

[0024] The driving motor 2 may be a stepping motor, and the stepping motor may be provided with a speed reducer to control the rotation speed, thereby improving the telescopic accuracy.

[0025] Combination Figures 1 to 6As shown, the housing 1 is provided with an anti-rotation sleeve 11 that cooperates with the telescopic rod 4 to limit the rotation of the telescopic rod 4. Specifically, the anti-rotation sleeve 11 can be installed inside the housing 1 by interference fit so that the anti-rotation sleeve 11 cannot rotate inside the housing 1. In other embodiments, in order to strengthen the tightness of the anti-rotation sleeve 11, the anti-rotation sleeve 11 and the housing 1 can also be fixed by an adhesive, such as thread glue. The anti-rotation sleeve 11 can be made of plastic or other materials. At least one anti-rotation surface 111 is provided in the anti-rotation sleeve 11, and a rotation-limiting surface 41 that matches the anti-rotation surface 111 is provided on the outer side of the telescopic rod 4. Specifically, in this embodiment, two anti-rotation surfaces 111 are provided, and the two anti-rotation surfaces 111 are relatively arranged on the inner wall of the anti-rotation sleeve 11. At the same time, two rotation-limiting surfaces 41 are relatively arranged on the outer wall of the telescopic rod 4 to cooperate with the two anti-rotation surfaces 111. The anti-rotation surface 111 cooperates with the rotation-limiting surface 41, so that the telescopic rod 4 does not rotate during the telescopic movement, thereby improving the stability of the telescopic rod 4 during the telescopic operation. In another embodiment, when a screw nut 7 is further connected between the transmission screw 3 and the telescopic rod 4, the screw nut 7 is also provided with the same rotation-limiting surface 41, so that the existing rotation-limiting nut can be eliminated and synchronization with the telescopic rod 4 can be ensured.

[0026] In another embodiment, the anti-rotation sleeve 11 includes an upper anti-rotation sleeve 11 and a lower anti-rotation sleeve 11 that match each other, and the upper anti-rotation sleeve 11 and the lower anti-rotation sleeve 11 are suitable for surrounding an anti-rotation space for accommodating the telescopic rod 4. Here, the driving motor 2, the bearing 6, the telescopic rod 4, and the transmission screw 3 can all be arranged in the anti-rotation sleeve 11, and the anti-rotation sleeve 11 is arranged in the housing 1 and cannot rotate in the housing 1. The guide sleeve 5 can be sleeved on the outside of the anti-rotation sleeve 11, and the anti-rotation sleeve 11 is located on the outside of the accommodating space and is recessed inward for installing the guide sleeve 5, so that the outside of the guide sleeve 5 is flush with the outside of the widest part of the anti-rotation sleeve 11 to save installation space. During installation, each component can be installed on the upper anti-rotation sleeve 11 or the lower anti-rotation sleeve 11 first, and then the other anti-rotation sleeve 11 can be docked, and then the entire anti-rotation sleeve 11 can be installed from one end of the housing 1 into the housing 1 to facilitate quick disassembly and assembly.

[0027] In this embodiment, the transmission screw 3 is connected to the drive motor 2 through a coupling 9, and a bearing 6 and a buffer pad 8 are provided on the coupling 9. The buffer pad 8 is provided between the screw nut 7 and the bearing 6 so as to contact the buffer pad 8 when the screw nut 7 moves to the bottom to achieve buffering. Here, when the screw nut 7 is provided, the buffer pad 8 can directly contact the screw nut 7. When only the telescopic rod 4 is provided, the telescopic rod 4 directly contacts the buffer pad 8, so that when the telescopic rod 4 or the screw nut 7 moves to the bottom limit position, the buffering effect of the buffer pad 8 can prevent the coupling 9 from being loosened due to multiple collisions. In this embodiment, the coupling 9 is connected to the rotating shaft of the drive motor 2 through a transmission pin 10 to reduce the impact of the load on the motor shaft.

[0028] Through the above-mentioned arrangement, the structure of the entire electric push rod is made more compact, and has the characteristics of small size, high precision, high strength, and good self-locking performance. It can be installed and used in a micro-space, and through the arrangement of the anti-rotation sleeve 11, the electric push rod is more stable when working.

[0029] It should be understood that the above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0030] The above description of the drawings used in the implementation manner only shows certain embodiments of the utility model and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

Claims

1. An anti-rotation electric push rod, comprising a housing, wherein a transmission screw and a telescopic rod are arranged in the housing, wherein the telescopic rod is sleeved in the transmission screw to be adapted to be telescopic along the axial direction of the housing, wherein: An anti-rotation sleeve installed on the outside of the telescopic rod is arranged in the shell, and the anti-rotation sleeve is configured to limit the telescopic rod from rotating around its central axis.

2. The anti-rotation electric push rod according to claim 1, characterized in that: At least one anti-rotation surface is arranged inside the anti-rotation sleeve, and a rotation-limiting surface matching the anti-rotation surface is arranged on the outer side surface of the telescopic rod.

3. The anti-rotation electric push rod according to claim 2, characterized in that: The anti-rotation surfaces are provided with two, and the two anti-rotation surfaces are arranged opposite to each other on the inner wall of the anti-rotation sleeve.

4. The anti-rotation electric push rod according to claim 3, characterized in that: The outer wall of the telescopic rod is oppositely provided with two rotation-limiting surfaces for cooperating with the two anti-rotation surfaces.

5. The anti-rotation electric push rod according to claim 1, characterized in that: The anti-rotation sleeve is interference-fitted with the inner wall of the shell.

6. The anti-rotation electric push rod according to claim 1, characterized in that: The anti-rotation sleeve comprises an upper anti-rotation sleeve and a lower anti-rotation sleeve which are detachably connected and matched with each other, and the upper anti-rotation sleeve and the lower anti-rotation sleeve are suitable for enclosing an anti-rotation space for accommodating the telescopic rod.

7. The anti-rotation electric push rod according to claim 1, characterized in that: A screw nut is arranged between the transmission screw and the telescopic rod, and the screw nut is threadedly connected to the transmission screw so as to move along the axial direction of the transmission screw when the transmission screw rotates, thereby driving the telescopic rod to perform telescopic work.

8. The anti-rotation electric push rod according to claim 7, characterized in that: The transmission screw is connected to the driving motor through a coupling, and a bearing and a buffer pad are arranged on the coupling. The buffer pad is arranged between the screw nut and the bearing so as to contact with the buffer pad to achieve buffering when the screw nut moves to the bottom.

9. The anti-rotation electric push rod according to claim 8, characterized in that: The coupling is connected to the rotating shaft of the driving motor via a transmission pin.

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