Non-contact travel switch for electric push rod

Abstract

The utility model provides a non-contact travel switch for an electric push rod, which comprises a bearing seat mounted in the push rod and a travel limiting assembly mounted on the bearing seat, the travel limiting assembly at least comprises a circuit board and a pull rod sliding relative to the circuit board, a first switch is mounted on the upper end face of the circuit board, and a second switch is mounted on the lower end face of the circuit board. A second switch is installed on the lower end face of the pull rod, a collision block for triggering the second switch is installed at the lower end of the pull rod, and the collision block and the bearing seat are arranged in a magnetic attraction mode. An elastic reset piece in the prior art is replaced with the magnetic type reset piece, the axial installation distance of the push rod is reduced under the condition that the stroke and limiting of the push rod are consistent, the push rod has the smaller size and weight, and the application range of the push rod is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a non-contact travel switch for an electric push rod. Background Art

[0002] An electric push rod, also known as a linear actuator, mainly consists of mechanisms such as a motor push rod and a control device, and can convert the rotational motion of an electric motor into the linear reciprocating motion of the push rod. It is widely used in various simple or complex technological processes to achieve remote control, centralized control or automatic control.

[0003] In the prior art, the stroke of the push rod is generally limited by a contact switch. The lead screw nut drives the push rod to rise until the limit switch is triggered to stop rising. The push rod maintains its original motion state before the contact switch, and the stopping process is relatively short, resulting in a large impact on the switch and causing vibration of the push rod.

[0004] Chinese Patent CN217789506U discloses a travel switch structure for an electric push rod, which includes a motor, a lead screw, a nut, a mounting seat, a slider, a rod, a limit block, an elastic member and a travel switch. The nut is arranged on the lead screw. The slider is installed on the mounting seat and moves along the length direction of the lead screw on the mounting seat. The rod is fixedly connected to the slider and passes through the nut. The limit block is movably connected to the rod. The elastic member resets the slider, and the travel switch is controllably connected to the motor. This utility model only needs to adjust the position of the limit block on the rod, without adjusting the position of the travel switch, to adjust the limit position of the nut movement. There is enough distance between the rod and the lead screw, and at the same time, the volume of the limit block is small, which is convenient for adjusting the limit position of the nut movement.

[0005] However, this technical solution has the following problems. It uses an elastic member to reset the slider, and the axial installation distance is relatively long. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a non-contact travel switch for an electric push rod in view of the deficiencies of the prior art. By using a magnetic attraction reset member to replace the elastic reset member in the prior art, the axial installation distance of the push rod is reduced under the condition that the push rod stroke and the limit are consistent, so that the push rod has a smaller volume and weight, and the applicable range of the push rod is expanded.

[0007] To achieve the above object, the present utility model provides the following technical solutions:

[0008] A non-contact travel switch for an electric push rod, comprising a bearing seat installed in the push rod and a travel limit assembly installed on the bearing seat. The travel limit assembly at least includes a circuit board and a pull rod that slides relative to the circuit board. A first switch is installed on the upper end face of the circuit board, and a second switch is installed on the lower end face. A striker for triggering the second switch is installed at the lower end of the pull rod, and the striker is magnetically attracted to the bearing seat.

[0009] As a preference, a first magnetic member is installed on the bottom surface of the striker, and a second magnetic member that attracts each other is installed on the bearing seat corresponding to the first magnetic member.

[0010] As a preference, the travel limit assembly further includes a switch seat. A positioning surface is provided above the bearing seat, and the switch seat is coaxially installed on the positioning surface.

[0011] As a preference, the circuit board is installed on the upper end face of the switch seat, and the pull rod is slidably installed up and down on one side of the switch seat.

[0012] As a preference, the switch seat includes an installation space for accommodating the second switch and an installation structure that slidably cooperates with the pull rod and the striker. The installation structure is arranged outside the installation space, and the pull rod drives the striker to move up and down in the installation space.

[0013] As a preference, the installation structure is provided with a limit step for restricting the movement range of the striker.

[0014] As a preference, the switch seat further includes a wire bundling structure, and the wire bundling structure is arranged outside the switch seat; the bearing seat is provided with a wire harness channel corresponding to the wire bundling structure.

[0015] As a preference, the circuit board, the switch seat, and the bearing seat are sequentially connected from top to bottom by fasteners.

[0016] As a preference, several positioning structures are provided on the positioning surface, and positioning grooves that cooperate with the positioning structures are provided on the bottom surface of the switch seat.

[0017] As a preference, a limit block is installed on the pull rod.

[0018] The beneficial effects of the present utility model are as follows:

[0019] (1) By using a magnetically attracted reset member to replace the elastic reset member in the prior art, the present utility model reduces the axial installation distance of the push rod under the condition that the travel and limit of the push rod are consistent, makes the push rod have a smaller volume and weight, and expands the application range of the push rod.

[0020] (2) In the present utility model, the striker and the bearing seat are magnetically attracted. When the lead screw nut rises to contact the limit block on the pull rod, it is necessary to overcome the magnetic force between the striker and the bearing seat to make the striker contact the second switch and stop the motor. At this time, the magnetic force applies a downward acceleration to the lead screw nut, playing a buffering role. Moreover, the magnetic attraction can make the striker return to the preset position more accurately, reducing the vibration and impact of the push rod, and improving the stability and precision of the push rod.

[0021] (3) Through the cooperation of the first switch and the second switch on the circuit board with the striker, and by setting the limit step to limit the movement range of the striker, the present utility model realizes the precise limit of the push rod stroke, ensures the accurate stop and start of the push rod at a specific position, and enhances the reliability and controllability of the system.

[0022] (4) By setting the positioning structure and the positioning groove, the switch seat can be quickly positioned on the bearing seat. And by using fasteners to connect the circuit board, the switch seat and the bearing seat, and cooperating with the wire harness structure and the wire harness channel, the wire harness management is made more tidy, the assembly efficiency is improved, and the later maintenance and repair are facilitated. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2 is a schematic sectional view of the present utility model;

[0025] Figure 3 is an exploded view of the present utility model. Detailed Embodiment

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0028] Embodiment

[0029] As Figures 1-3 shown, this embodiment provides a non-contact travel switch for an electric push rod, which includes a bearing seat 1 installed in the push rod and a travel limit assembly 2 installed on the bearing seat 1. The travel limit assembly 2 at least includes a circuit board 3 and a pull rod 4 that slides relative to the circuit board 3. A first switch 31 is installed on the upper end face of the circuit board 3, and a second switch 32 is installed on the lower end face. A striker 41 for triggering the second switch 32 is installed at the lower end of the pull rod 4, and the striker 41 and the bearing seat 1 are magnetically attracted.

[0030] By using a magnetic reset member to replace the elastic reset member in the prior art, the axial installation distance of the push rod is reduced when the travel and limit of the push rod are the same, making the push rod have a smaller volume and weight, adapting to space limitations and lightweight requirements, and expanding the applicable range of the push rod.

[0031] As Figure 2 、 3 shown, a first magnetic member 5 is installed on the bottom surface of the striker 41, and a second magnetic member 6 that attracts each other is installed on the bearing seat 1 corresponding to the first magnetic member 5.

[0032] By magnetically attracting the striker 41 and the bearing seat 1, when the lead screw nut rises to contact the limit block 42 on the pull rod 4, it is necessary to overcome the magnetic force between the striker 41 and the bearing seat 1 to make the striker 41 contact the second switch 32 to stop the motor operation. At this time, the magnetic force applies a downward acceleration to the lead screw nut, playing a buffering role, and the magnetic attraction can make the striker 41 return to the preset position more accurately, reducing the vibration and impact of the push rod, and improving the stability and accuracy of the push rod.

[0033] As Figure 2 、 3 shown, the stroke limit assembly 2 further includes a switch base 7. A positioning surface 11 is provided above the bearing seat 1. The switch base 7 is coaxially installed on the positioning surface 11. The circuit board 3 is installed on the upper end surface of the switch base 7. The pull rod 4 is slidably installed up and down on one side of the switch base 7. The switch base 7 includes an installation space 71 for accommodating the second switch 32 and an installation structure 72 that slidably cooperates with the pull rod 4 and the striker 41. The installation structure 72 is provided outside the installation space 71. The pull rod 4 drives the striker 41 to move up and down in the installation space 71.

[0034] As Figure 2 、 3 shown, the installation structure 72 is provided with a limit step 73 that restricts the movement range of the striker 41.

[0035] Through the cooperation of the first switch 31 and the second switch 32 on the circuit board 3 with the striker 41, and by setting the limit step 73 to restrict the movement range of the striker 41, accurate limit of the push rod stroke is achieved, ensuring the accurate stop and start of the push rod at a specific position, and enhancing the reliability and controllability of the system.

[0036] As Figure 2 、 3 shown, the switch base 7 further includes a wire bundling structure 74. The wire bundling structure 74 is provided outside the switch base 7; the bearing seat 1 is provided with a wire harness channel 12 corresponding to the wire bundling structure 74. The design of the wire bundling structure 74 and the wire harness channel 12 makes the wire harness management more tidy, facilitating later maintenance and repair.

[0037] As Figure 2 、 3 shown, the circuit board 3, the switch base 7, and the bearing seat 1 are sequentially connected from top to bottom by fasteners 8. The positioning surface 11 is provided with a plurality of positioning structures 13, and the bottom surface of the switch base 7 is provided with positioning grooves 75 that cooperate with the positioning structures 13.

[0038] By providing the positioning structures 13 and the positioning grooves 75, the switch base 7 can be quickly positioned on the bearing seat 1, and by using fasteners 8 to connect the circuit board 3, the switch base 7, and the bearing seat 1, the assembly efficiency is improved.

[0039] As Figure 2 shown, a limit block 42 is installed on the pull rod 4, and the installation position of the limit block 42 on the pull rod 4 can be manually adjusted to change the maximum stroke of the push rod.

[0040] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A non-contact travel switch for an electric push rod, characterized in that: It includes a bearing seat installed in the push rod and a travel limit assembly installed on the bearing seat, the travel limit assembly at least includes a circuit board and a pull rod sliding relative to the circuit board, a first switch is installed on the upper end surface of the circuit board, and a second switch is installed on the lower end surface, and a collision block for triggering the second switch is installed on the lower end of the pull rod, and the collision block and the bearing seat are magnetically arranged.

2. A non-contact travel switch for an electric push rod according to claim 1, characterized in that: A first magnetic component is installed on the bottom surface of the collision block, and a second magnetic component that attracts each other is installed on the bearing seat corresponding to the first magnetic component.

3. A non-contact travel switch for an electric push rod according to claim 1, characterized in that: The travel limit assembly also includes a switch seat. A positioning surface is arranged above the bearing seat, and the switch seat is coaxially mounted on the positioning surface.

4. A non-contact travel switch for an electric push rod according to claim 3, characterized in that: The circuit board is mounted on the upper end surface of the switch seat, and the pull rod is mounted on one side of the switch seat for sliding up and down movement.

5. A non-contact travel switch for an electric push rod according to claim 4, characterized in that: The switch seat includes an installation space for accommodating the second switch and an installation structure that slidably cooperates with the pull rod and the bump block. The installation structure is arranged outside the installation space, and the pull rod drives the bump block to move up and down in the installation space.

6. A non-contact travel switch for an electric push rod according to claim 5, characterized in that: The mounting structure is provided with a limiting step for limiting the moving range of the collision block.

7. A non-contact travel switch for an electric push rod according to claim 3, characterized in that: The switch seat further comprises a wire harness structure, which is arranged outside the switch seat; the bearing seat is provided with a wire harness channel corresponding to the wire harness structure.

8. The non-contact travel switch for an electric push rod according to claim 3, characterized in that: The positioning surface is provided with a plurality of positioning structures, and the bottom surface of the switch seat is provided with positioning grooves matched with the positioning structures.

9. A non-contact travel switch for an electric push rod according to claim 3, characterized in that: The circuit board, the switch seat and the bearing seat are connected in sequence from top to bottom through fasteners.

10. The non-contact travel switch for an electric push rod according to claim 1, characterized in that: A limit block is installed on the pull rod.

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