Switch assembly and electric push rod stroke limiting device applying same

Abstract

The utility model provides a switch assembly and an electric push rod stroke limiting device using the same, the switch assembly comprises a first circuit board and a second circuit board arranged below the first circuit board at an interval, and the first circuit board and the second circuit board are respectively provided with a first controller and a second controller; the pin end of the first controller is installed on the first circuit board and is provided with a first travel switch lower than the second circuit board. The pin end of the second controller is installed on the second circuit board and is provided with a second travel switch higher than the first circuit board. The electric push rod stroke limiting device comprises the switch assembly and a limiting mechanism slidably arranged on the side face of the switch assembly. The controller is respectively installed on the two circuit boards arranged at intervals, the axial installation length of the switch assembly is shortened, the switch assembly is used in the electric push rod stroke limiting device, the purpose of reducing the overall length of the push rod is achieved, and the problem that installation of the push rod in a compact space is limited is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric push rods, in particular to a switch component and an electric push rod travel limit device using the switch component. Background Art

[0002] The working principle of the electric push rod is mainly through the rotation of the motor, which drives the lead screw nut to perform linear reciprocating motion after passing through the reduction mechanism. By changing the forward and reverse rotation of the motor, the push rod can be extended and retracted. As a common linear transmission device, the electric push rod has been widely used in various industries and fields. It is easy to install, easy to operate, and has low maintenance costs. It has gradually replaced traditional transmission methods such as cylinders and hydraulic cylinders.

[0003] Chinese patent CN206323254U discloses a linear drive device, and particularly relates to a linear electric push rod with a stroke limit protection device. The technical solution is: A linear electric push rod with a stroke limit protection device, including a motor assembly, a screw, a stroke nut sleeved on the screw, a stroke push rod sleeved outside the screw, and an outer sleeve sleeved outside the stroke nut. The motor assembly includes a motor, and a retraction stroke control switch and an extension stroke control switch of the stroke push rod are arranged in the outer sleeve between the motor and the stroke nut. The retraction stroke control switch and the extension stroke control switch are electrically connected to the motor respectively. The end of the retraction stroke control switch facing the stroke nut is provided with a resistance member that can contact the stroke nut, and the outer sleeve is provided with an extension stroke control switch driving member that is linked to the stroke nut. The above technical solution provides a linear electric push rod with a stroke limit protection device that has precise stroke control, simple structure, and stable control.

[0004] However, this technical solution has the following problems: the retraction stroke control switch and the extension stroke control switch are installed on the same circuit board, and the axial length is large, so that the push rod requires a larger installation space, which limits its application in certain compact or specific spaces. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and to provide a switch assembly and an electric push rod stroke limit device using the same. The axial installation length of the switch assembly is shortened by installing the controller on two spaced-apart circuit boards respectively, and the switch assembly is used in the electric push rod stroke limit device, thereby achieving the purpose of reducing the overall length of the push rod and solving the problem of limited installation of the push rod in a compact space.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A switch assembly comprises a first circuit board and a second circuit board spaced below the first circuit board, wherein the first circuit board and the second circuit board are respectively mounted with a first controller and a second controller;

[0008] The pin end of the first controller is installed on the first circuit board, and is provided with a first travel switch lower than the second circuit board; the pin end of the second controller is installed on the second circuit board, and is provided with a second travel switch higher than the first circuit board.

[0009] As a preference, the first circuit board is provided with a first avoidance space corresponding to the second controller, and the second circuit board is provided with a second avoidance space corresponding to the first controller.

[0010] Preferably, the first circuit board and the second circuit board are arranged in parallel, and the projection of the mounting position of the pin end of the first controller on the second circuit board is bilaterally symmetrical with the mounting position of the pin end of the second controller.

[0011] As a preference, the first circuit board and the second circuit board are coaxially arranged, and a circular hole is formed in the center of both.

[0012] As a preference, the device further comprises at least one connecting member, wherein the connecting member abuts between the first circuit board and the second circuit board, and a plurality of connecting columns are arranged on the abutting surfaces of the connecting member and the first circuit board and the second circuit board.

[0013] As a preference, two connecting members are provided and are symmetrically arranged on both sides of the circular hole.

[0014] As a preference, the first avoidance space and the second avoidance space are gaps.

[0015] A travel limit device for an electric push rod comprises the switch assembly mentioned above and a limit mechanism slidably arranged on the side of the switch assembly.

[0016] As a preferred embodiment, the limiting mechanism is arranged outside the first controller, and comprises a resistance member arranged below the first controller and a guide rod driving the resistance member to rise and fall;

[0017] The abutment is installed at the lower end of the guide rod, and the guide rod sleeve is provided with a reset member abutting against the abutment; and a limiting member is installed at the upper end of the guide rod.

[0018] Preferably, the first circuit board is provided with a third avoidance space on the outer side of the first controller corresponding to the guide rod.

[0019] The beneficial effects of the utility model are:

[0020] (1) The utility model can shorten the axial installation length of the switch assembly by installing the controller on two spaced-apart circuit boards, making the structure of the utility model more compact, thereby achieving the purpose of reducing the overall length of the push rod.

[0021] (2) The utility model avoids the situation where the travel switch is blocked by the circuit board and cannot be triggered by setting a first travel switch lower than the second circuit board and a second travel switch higher than the first circuit board. The first notch and the second notch provide installation positions for the second controller and the first controller respectively, avoiding interference between the components and improving the stability of the travel limit device.

[0022] (3) The utility model provides a reset member. When the travel limit device is installed in the push rod, the resistance member can provide a force to move away from the first travel switch, so that the resistance member will trigger the first travel switch to stop the push rod only when the screw nut contacts the limit member and drives the guide rod and the resistance member to move, thereby improving the accuracy of travel control.

[0023] (4) The utility model connects the first circuit board and the second circuit board which are spaced apart by providing at least one connecting member, and the connecting member also plays a role in determining the spacing distance, so the structure is compact and stable.

[0024] In summary, the utility model has the advantages of compact structure, high stability and precision, etc., and can shorten the overall length of the push rod when installed in the push rod, avoiding limitation of its installation position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the utility model;

[0026] Figure 2 This is an explosion diagram of Embodiment 1 of the utility model;

[0027] Figure 3 This is a schematic diagram of the overall structure of the second embodiment of the utility model;

[0028] Figure 4 It is a schematic diagram comparing the installation heights of the second embodiment of the utility model and the prior art. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting 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 indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] Embodiment 1

[0032] like Figure 1 , 2 As shown, this embodiment provides a switch assembly, including a first circuit board 3 and a second circuit board 4 spaced below the first circuit board 3, the first circuit board 3 and the second circuit board 4 are respectively installed with a first controller 5 and a second controller 6; the pin end of the first controller 5 is installed on the first circuit board 3, and a first travel switch 51 lower than the second circuit board 4 is provided; the pin end of the second controller 6 is installed on the second circuit board 4, and a second travel switch 61 higher than the first circuit board 3 is provided.

[0033] By installing the controllers on two spaced-apart circuit boards respectively, the axial installation length of the switch assembly 1 can be shortened, making the structure of the switch assembly 1 more compact.

[0034] like Figure 2 As shown, the first circuit board 3 is provided with a first avoidance space 31 corresponding to the second controller 6 , and the second circuit board 4 is provided with a second avoidance space 41 corresponding to the first controller 5 .

[0035] By setting the first travel switch 51 lower than the second circuit board 4 and the second travel switch 61 higher than the first circuit board 3, the situation where the travel switch is blocked by the circuit board and cannot be triggered is avoided, and the first avoidance space 31 and the second avoidance space 41 provide installation space for the second controller 6 and the first controller 5 respectively, avoiding interference between the components and improving the stability of the travel limit device.

[0036] like Figure 1 ,2 As shown, the first circuit board 3 and the second circuit board 4 are arranged in parallel, and the projection of the mounting position of the pin end of the first controller 5 on the second circuit board 4 is symmetrical with the mounting position of the pin end of the second controller 6. The first circuit board 3 and the second circuit board 4 are arranged coaxially, and a circular hole 9 is opened in the center of both. The first avoidance space 31 and the second avoidance space 41 are notches, which are arranged outside the circular hole 9, and a circuit board of a certain width is left between the notch and the circular hole 9 to prevent the notch and the circular hole 9 from causing excessive influence on the structural strength of the circuit board.

[0037] like Figure 2 As shown, the switch assembly 1 further includes at least one connector 7, the connector 7 abuts between the first circuit board 3 and the second circuit board 4, and the connector 7 is provided with a plurality of connector posts 71 whose two ends respectively cooperate with the first circuit board 3 and the second circuit board 4. Two connectors 7 are provided, and are symmetrically arranged on both sides of the circular hole 9. The symmetry axis of the pin end mounting position of the first controller 5 and the pin end mounting position of the second controller 6 is perpendicular to the symmetry axis of the two connectors 7, so that the first circuit board 3 and the second circuit board 4 are subjected to uniform force.

[0038] By symmetrically arranging two connecting members 7 to connect the first circuit board 3 and the second circuit board 4 arranged at an interval, the first circuit board 3 and the second circuit board 4 are subjected to uniform force, and the connecting member 7 also plays a role in determining the interval distance, and the structure is compact and stable.

[0039] Embodiment 2

[0040] like Figure 1-4 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment is different from the first embodiment in that: an electric push rod travel limit device comprises the switch assembly 1 described in the first embodiment and a limit mechanism 2 slidably disposed on the side of the switch assembly 1.

[0041] By using the switch assembly 1 in the stroke limit device of the electric push rod, the axial installation length of the stroke limit device in the electric push rod is shortened, thereby achieving the purpose of reducing the overall length of the push rod.

[0042] like Figure 3 As shown, the limiting mechanism 2 is arranged on the outside of the first controller 5, and includes a resistance member 21 arranged below the first controller 5 and a guide rod 22 for driving the resistance member 21 to rise and fall; the resistance member 21 is installed at the lower end of the guide rod 22, and the guide rod 22 is sleeved with a reset member 23 that abuts against the resistance member 21; a limiting member 24 is installed at the upper end of the guide rod 22, and the relative positions of the resistance member 21, the guide rod 22 and the limiting member 24 are fixed.

[0043] By setting the reset member 23, when the travel limit device is installed in the push rod, a force can be provided to the resistance member 21 to move away from the first travel switch 51, so that the resistance member 21 will trigger the first travel switch 51 to stop the push rod only when the screw nut abuts against the limit member 24 and drives the guide rod 22 and the resistance member 21 to move, thereby improving the accuracy of travel control.

[0044] like Figure 2 , 3 As shown, the first circuit board 3 is provided with a third avoidance space 32 on the outer side of the first controller 5 corresponding to the guide rod 22, so as to reserve movable space for the guide rod 22 to prevent interference.

[0045] Further, when the push rod is extended until its screw nut contacts the limit member 24, the push rod continues to extend until the contact member 21 stops moving when the first travel switch 51 is turned on, and reaches the extension limit.

[0046] The push rod retracts until its screw nut abuts against the second travel switch 61, so that the second controller 6 is turned on and stops moving, reaching the retraction limit.

[0047] like Figure 2 As shown, a plurality of mounting holes 8 are correspondingly provided on the first circuit board 3 and the second circuit board 4. It should be noted that, because the second controller 6 is triggered by the screw nut, the travel limit switch is generally installed between the screw nut and the drive assembly in the push rod, and the mounting hole 8 is used to position and install the travel limit switch in the push rod, and the diameter of the circular hole 9 needs to be slightly larger than the transmission shaft passing therethrough to avoid interference with the transmission shaft.

[0048] Figure 4 Comparing the left view of the present invention with that of the prior art, it can be seen intuitively that the axial length of the present invention is shorter, and the shortened distance is approximately equal to the spacing distance between the two circuit boards.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch assembly, characterized in that: It comprises a first circuit board and a second circuit board spaced below the first circuit board, wherein the first circuit board and the second circuit board are respectively equipped with a first controller and a second controller; The pin end of the first controller is installed on the first circuit board, and is provided with a first travel switch lower than the second circuit board; the pin end of the second controller is installed on the second circuit board, and is provided with a second travel switch higher than the first circuit board.

2. A switch assembly according to claim 1, characterized in that: The first circuit board is provided with a first avoidance space corresponding to the second controller, and the second circuit board is provided with a second avoidance space corresponding to the first controller.

3. A switch assembly according to claim 1, characterized in that: The first circuit board and the second circuit board are arranged in parallel, and the projection of the installation position of the pin end of the first controller on the second circuit board is bilaterally symmetrical with the installation position of the pin end of the second controller.

4. A switch assembly according to claim 1, characterized in that: The first circuit board and the second circuit board are coaxially arranged, and a circular hole is opened in the center of both.

5. A switch assembly according to claim 4, characterized in that: It also includes at least one connecting member, which is abutted between the first circuit board and the second circuit board, and a plurality of connecting columns are arranged on the abutting surface of the connecting member with the first circuit board and the second circuit board.

6. A switch assembly according to claim 5, characterized in that: The connecting pieces are provided with two and are symmetrically arranged on both sides of the circular hole.

7. A switch assembly according to claim 2, characterized in that: The first avoidance space and the second avoidance space are gaps.

8. An electric push rod travel limit device, characterized in that: It comprises the switch assembly according to any one of claims 1 to 7 and a limiting mechanism slidably arranged on the side of the switch assembly.

9. The electric push rod stroke limiting device according to claim 8, characterized in that: The limiting mechanism is arranged outside the first controller, and comprises a resisting member arranged below the first controller and a guide rod driving the resisting member to rise and fall; The abutment is installed at the lower end of the guide rod, and the guide rod sleeve is provided with a reset member abutting against the abutment; and a limiting member is installed at the upper end of the guide rod.

10. The electric push rod stroke limiting device according to claim 9, characterized in that: The first circuit board is provided with a third avoidance space on the outer side of the first controller corresponding to the guide rod.

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