Electric push rod with origin position feedback

Abstract

The utility model provides an electric push rod with an original point position feedback function, 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 connected into the transmission lead screw so as to stretch out and draw back in the axial direction of the shell when the transmission lead screw rotates, and the driving motor and the triggering device are electrically connected with the control system. The driving motor is connected with the transmission lead screw to drive the transmission lead screw to rotate, and the triggering device is arranged in the axial direction of the shell so as to feed back the position of the telescopic rod to the control system when the telescopic rod moves to the original point position to control the next action of the driving motor. According to the scheme, the control precision 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 ultra-micro stepping electric push rod with origin position feedback. Background Art

[0002] An electric linear actuator is an electric drive device that converts the rotational motion of a motor into the linear reciprocating motion of a linear actuator. However, many electric linear actuators 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, conventional brushed motors cannot accurately control the number of rotations and the precise speed, and therefore cannot control the extension and retraction of the electric linear actuator. Therefore, in situations where the extension and retraction need to be precisely controlled, it is impossible to select a suitable ultra-mini linear motion actuator. At the same time, the cylindrical electric linear actuator has the highest space utilization, and the one-piece outer tube ensures structural strength, and it is difficult to provide feedback on the origin contact position. Utility Model Content

[0003] In view of this, an object of the present invention is to provide an electric push rod with origin position feedback to solve the above problems.

[0004] The utility model adopts the following scheme: the application provides an electric push rod with origin position feedback, including a shell, in which a transmission screw and a telescopic rod are arranged, the telescopic rod is connected to the transmission screw to be extended and retracted along the axial direction of the shell under the drive of the transmission screw, and also includes: a control system and a drive motor and a trigger device electrically connected to the control system, the drive motor is connected to the transmission screw to drive the transmission screw to rotate, and the trigger device is configured to trigger the control system to control the next action of the drive motor when the telescopic rod moves to a set origin position.

[0005] Furthermore, the trigger device includes a first conductive contact and a second conductive contact respectively connected to the control system, and the first conductive contact and the second conductive contact are arranged on the movement path of the telescopic rod so that when the telescopic rod touches the first conductive contact and the second conductive contact, the first conductive contact and the second conductive contact are disconnected or connected to trigger the control system.

[0006] Furthermore, the telescopic rod is provided with a conductive part, and when the conductive part moves to touch the first conductive contact and the second conductive contact, the first conductive contact and the second conductive contact can be connected and conducted, so that the control system obtains the position information of the telescopic rod.

[0007] Further, the positions of the first conductive contact and the second conductive contact are origin positions.

[0008] Furthermore, the driving motor is a stepping motor.

[0009] Furthermore, the control system is integrated into the drive motor.

[0010] Furthermore, an anti-rotation sleeve cooperating with the telescopic rod is arranged in the shell to limit the rotation of the telescopic rod.

[0011] Furthermore, the anti-rotation sleeve includes an upper anti-rotation sleeve and a lower anti-rotation sleeve that match each other, the upper anti-rotation sleeve and the lower anti-rotation sleeve are suitable for enclosing an anti-rotation space for accommodating the telescopic rod, and an installation groove suitable for installing the first conductive contact and the second conductive contact is provided at the connection between the upper anti-rotation sleeve and the lower anti-rotation sleeve.

[0012] Furthermore, a limited rotation surface is provided on the telescopic rod, and anti-rotation surfaces matching the limited rotation surface are provided in the upper anti-rotation sleeve and the lower anti-rotation sleeve.

[0013] Furthermore, a bearing is provided on the transmission screw.

[0014] Beneficial effects:

[0015] The present application provides a trigger device on the axis path of the housing to trigger the trigger device when the telescopic rod moves to the origin position, so that the control system controls the drive motor to stop or reverse, and prevents the drive motor from continuing to work when the telescopic rod moves to the origin position due to insufficient installation accuracy, causing the displacement of the telescopic rod to exceed the predetermined position. On the one hand, the accuracy of the origin position of each movement can be ensured, and on the other hand, the service life of the product is improved. Furthermore, by providing an anti-rotation sleeve inside the housing, 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

[0016] Figure 1 This is a schematic diagram of the overall structure of an electric push rod with origin position feedback according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of an electric push rod with origin position feedback according to an embodiment of the utility model;

[0018] Figure 3 It is a schematic cross-sectional structure diagram of an electric push rod with origin position feedback according to an embodiment of the utility model;

[0019] Figure 4 It is another cross-sectional structural schematic diagram of an electric push rod with origin position feedback according to an embodiment of the utility model;

[0020] Figure 5It is a schematic structural diagram of an electric push rod with origin position feedback in an embodiment of the utility model after removing the housing and the upper anti-rotation sleeve;

[0021] Figure 6 It is a structural schematic diagram of a lower anti-rotation sleeve of an electric push rod with origin position feedback according to an embodiment of the utility model;

[0022] Figure numerals: housing 1, drive motor 2, transmission screw 3, telescopic rod 4, conductive part 41, rotation limiting surface 411, guide sleeve 5, bearing 6, first conductive contact 7, second conductive contact 8, upper anti-rotation sleeve 9, lower anti-rotation sleeve 10, mounting groove 11, anti-rotation surface 12, connecting terminal 13. DETAILED DESCRIPTION

[0023] Combination Figures 1 to 6 As shown, this embodiment provides an electric push rod with origin position feedback, including a shell 1, in which a transmission screw 3 and a telescopic rod 4 are arranged, and the telescopic rod 4 is connected to the transmission screw 3 so as to be telescopic along the axial direction of the shell 1 when the transmission screw 3 rotates. It also includes: a control system and a drive motor 2 and a trigger device electrically connected to the control system, the drive motor 2 is connected to the transmission screw 3 to drive the transmission screw 3 to rotate, and the trigger device is arranged in the axial direction of the shell 1 to feed back the position of the telescopic rod 4 to the control system when the telescopic rod 4 moves to the origin position so as to control the next action of the drive motor 2.

[0024] 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 function when the telescopic rod 4 is extended and retracted; a bearing 6 is arranged on the transmission screw 3. The origin position can be set at any position on the telescopic motion path of the telescopic rod 4, and can be set as required. It can be set to the motion starting position of the bottom end of the telescopic rod 4, so as to provide position feedback each time the telescopic rod is extended and retracted, and correct the motion position deviation of the telescopic rod 4. The housing 1 adopts a round tube shape to reduce the processing cost. In this embodiment, the trigger device is arranged in the axial direction of the housing 1 to feedback the position of the telescopic rod 4 to the control system when the telescopic rod 4 moves to the origin position to control the next action of the driving motor 2. The next action includes stopping the driving motor 2 or reversing the driving motor.

[0025] The driving motor 2 may be a stepper motor, and the stepper motor may be provided with a speed reducer to control the rotation speed, thereby improving the telescopic accuracy. The control system may be integrated on an existing control circuit board, such as a PBCA board. In another embodiment, the control system may be integrated in the stepper motor, or the control board provided by the stepper motor may be directly connected to the trigger device to receive the feedback signal of the trigger device, and the stepper motor may be controlled to stop or reverse according to the signal.

[0026] Combination Figures 1 to 5 As shown, in this embodiment, the trigger device includes a first conductive contact 7 and a second conductive contact 8 respectively connected to the control system, and the first conductive contact 7 and the second conductive contact 8 are arranged at the origin position in the axial direction of the housing 1 so that when the telescopic rod 4 moves to touch the first conductive contact 7 and the second conductive contact 8, the first conductive contact 7 and the second conductive contact 8 are disconnected or connected so that the control system obtains the current position of the telescopic rod 4. Here, by setting two conductive contacts, when the first conductive contact 7 and the second conductive contact 8 are in a disconnected state, when the first conductive contact 7 and the second conductive contact 8 are connected by the telescopic rod 4, it is determined that the telescopic rod 4 is at the origin position, and the signal is fed back to the control system or the drive motor 2; or when the first conductive contact 7 and the second conductive contact 8 are originally in a connected state, when the first conductive contact 7 and the second conductive contact 8 are disconnected by the telescopic rod 4, it is determined that the telescopic rod 4 is at the origin position, and the signal is fed back to the control system or the drive motor 2. In this embodiment, the positions where the first conductive contact 7 and the second conductive contact 8 are located are the origin positions.

[0027] Specifically, in one embodiment, the telescopic rod 4 is provided with a conductive part 41, and when the conductive part 41 moves to touch the first conductive contact 7 and the second conductive contact 8, the first conductive contact 7 and the second conductive contact 8 can be connected, so that the control system obtains the origin position information. Here, the conductive part 41 is arranged at the bottom of the telescopic rod 4, and the first conductive contact 7 and the second conductive contact 8 are arranged between the telescopic rod 4 and the transmission screw 3. When the telescopic rod 4 moves to the bottom and contacts the first conductive contact 7 and the second conductive contact 8 at the same time, the circuit between the first conductive contact 7 and the second conductive contact 8 is connected, thereby generating an electrical signal to be transmitted to the drive motor 2 or the control system, and this position is the origin position.

[0028] It should be noted that, in other embodiments, the trigger device is not limited to the two conductive contacts in this embodiment, and may also be configured with a single contact trigger or multiple contact triggers, all of which are within the protection scope of this application.

[0029] Combination Figures 1 to 6 As shown, in another embodiment, an anti-rotation sleeve that cooperates with the telescopic rod 4 is provided in the housing 1 to limit the rotation of the telescopic rod 4. Specifically, the anti-rotation sleeve includes an upper anti-rotation sleeve 9 and a lower anti-rotation sleeve 10 that match each other, and the upper anti-rotation sleeve 9 and the lower anti-rotation sleeve 10 are suitable for surrounding an anti-rotation space for accommodating the telescopic rod 4, and a mounting groove 11 suitable for mounting the first conductive contact 7 and the second conductive contact 8 is provided at the connection between the upper anti-rotation sleeve 9 and the lower anti-rotation sleeve 10. Specifically, the first conductive contact 7 and the second conductive contact 8 are provided with a wire and a contact portion, the wire is fixed in the mounting groove 11, and the contact portion is fixed between the telescopic rod 4 and the transmission screw 3. Here, a limited rotation surface 411 is provided on the telescopic rod 4, and an anti-rotation surface 12 matching the limited rotation surface 411 is provided in the upper anti-rotation sleeve 9 and the lower anti-rotation sleeve 10. Through the cooperation of the limited rotation surface 411 and the anti-rotation surface 12, the telescopic rod 4 and the transmission screw 3 form a similar ball screw nut pair. Here, the drive motor 2, the bearing 6, the telescopic rod 4, and the transmission rod can all be arranged in the anti-rotation sleeve, and the anti-rotation connection is placed in the housing 1 and cannot rotate in the housing 1. The guide sleeve 5 can be connected to the outside of the anti-rotation sleeve, and the anti-rotation sleeve 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 to save installation space. During installation, each component can be installed on the upper anti-rotation sleeve 9 or the lower anti-rotation sleeve 10 first, and then the other anti-rotation sleeve can be docked, and then the entire anti-rotation sleeve can be installed into the housing 1 from one end of the housing 1.

[0030] It should be noted that the drive motor 2 is provided with a connection terminal 13 for connecting to other control systems.

[0031] Through the above scheme setting, the structure of the entire electric push rod is more compact, with the characteristics of small size, high precision, high strength, and good self-locking performance. It can be installed and used in a micro space to realize the movement of a micro mechanism. It can meet the use occasions with strict weight requirements for the actuator. The electric push rod has low power consumption and can use power sources such as chargers, batteries, and power adapters to meet the working conditions of various low-voltage power supply environments.

[0032] It should be understood that the above are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

[0033] 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 electric push rod with origin position feedback, comprising a housing, a transmission screw and a telescopic rod are arranged in the housing, the telescopic rod is connected to the transmission screw to be extended and retracted along the axial direction of the housing under the drive of the transmission screw, characterized in that: Also includes: A control system and a drive motor and a trigger device electrically connected to the control system, wherein the drive motor is connected to the transmission screw to drive the transmission screw to rotate, and the trigger device is configured to trigger the control system to control the next action of the drive motor when the telescopic rod moves to a set origin position.

2. The electric push rod with origin position feedback according to claim 1, characterized in that: The trigger device includes a first conductive contact and a second conductive contact respectively connected to the control system, and the first conductive contact and the second conductive contact are arranged on the movement path of the telescopic rod, so that when the telescopic rod touches the first conductive contact and the second conductive contact, the first conductive contact and the second conductive contact are disconnected or connected to trigger the control system.

3. The electric push rod with origin position feedback according to claim 2, characterized in that: The telescopic rod is provided with a conductive part, and when the conductive part moves to touch the first conductive contact and the second conductive contact, the first conductive contact and the second conductive contact can be connected and conducted, so that the control system obtains the position information of the telescopic rod.

4. The electric push rod with origin position feedback according to claim 3, characterized in that: The positions of the first conductive contact and the second conductive contact are the origin positions.

5. The electric push rod with origin position feedback according to any one of claims 1 to 3, characterized in that: The driving motor is a stepping motor.

6. The electric push rod with origin position feedback according to any one of claims 1 to 3, characterized in that: The control system is integrated into the drive motor.

7. The electric push rod with origin position feedback according to claim 2, characterized in that: An anti-rotation sleeve matched with the telescopic rod is arranged in the shell to limit the rotation of the telescopic rod.

8. The electric push rod with origin position feedback according to claim 7, characterized in that: The anti-rotation sleeve includes an upper anti-rotation sleeve and a lower anti-rotation sleeve that match each other. The upper anti-rotation sleeve and the lower anti-rotation sleeve are suitable for enclosing an anti-rotation space for accommodating the telescopic rod, and an installation groove suitable for installing the first conductive contact and the second conductive contact is provided at the connection between the upper anti-rotation sleeve and the lower anti-rotation sleeve.

9. The electric push rod with origin position feedback according to claim 8, characterized in that: A limited rotation surface is arranged on the telescopic rod, and anti-rotation surfaces matching the limited rotation surface are arranged in the upper anti-rotation sleeve and the lower anti-rotation sleeve.

10. The electric linear actuator with origin position feedback according to claim 1, characterized in that: A bearing is arranged on the transmission screw rod.

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