Electric push rod with absolute position feedback mechanism

Abstract

The utility model relates to the technical field of electric push rods, in particular to an electric push rod with an absolute position feedback mechanism. Comprising a rear end assembly; the sleeve assembly is arranged on one side of the rear end assembly; the motor assembly is arranged in the rear end assembly; the lead screw assembly is connected with the motor assembly; the sleeve assembly is arranged between the motor assembly and the lead screw assembly, the coupler assembly is arranged between the motor assembly and the lead screw assembly, the telescopic pipe assembly is arranged between the sleeve assembly and the lead screw assembly, and a position feedback device is arranged between the sleeve assembly and the telescopic pipe assembly; the position feedback device comprises a potentiometer which is arranged on the sleeve assembly; and one end of each outgoing line is connected with the potentiometer, and the other end of each outgoing line is connected with the motor assembly. The electric push rod of the absolute position feedback mechanism has the advantages of being rapid and accurate in positioning, simple in structure, convenient to operate and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electric push rods, in particular to an electric push rod with an absolute position feedback mechanism. Background Art

[0002] The electric push rod is composed of a drive motor, reduction gear, screw, nut, guide sleeve, push rod, slide seat, spring, housing, turbine, micro-control switch, etc.

[0003] Chinese patent CN218183165U discloses an electric push rod with a position feedback structure, which relates to the technical field of electric push rods with position feedback structures, including a rod sleeve, a push rod and a base, the top of the rod sleeve is penetrated with a slide groove, and the push rod is slidably connected with the slide groove, the bottom end of the rod sleeve is movably installed with a connecting seat, the top of the connecting seat is fixedly connected with a rotating rod, the bottom end of the rod sleeve is installed with a capacitive sensor at a position located on one side of the connecting seat, the outer side of the bottom end of the rod sleeve is provided with a plurality of limiting holes, the outer side of the top end of the base is provided with a plurality of mounting grooves, and the inside of the mounting groove is movably installed with a bayonet, and the bayonet and the limiting hole are engaged with each other. The utility model can reduce the installation space, facilitate the use of hospital beds, and improve the work efficiency of repairing and replacing the internal motor, the capacitive sensor and the communication unit, and has high convenience.

[0004] However, the capacitive sensor of this technical solution is particularly affected by environmental humidity and external electromagnetic interference, that is, the electric push rod is not suitable for humid environments. Secondly, as a quasi-absolute sensor, when the power is off for a long time, the battery needs to be replaced regularly, so it is difficult to use it as a sensor for long-term automatic measurement, which causes the sensor to fail and cannot feedback the position in time, affecting its use, resulting in large position errors and lack of precision. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and provide an electric push rod with an absolute position feedback mechanism, which realizes the function of real-time measurement of the absolute position of the push rod through the position feedback device in conjunction with multiple components of the electric push rod, thereby solving the problem of large absolute position error.

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

[0007] An electric push rod with an absolute position feedback mechanism, comprising:

[0008] Backend components;

[0009] A sleeve assembly, arranged on one side of the rear end assembly;

[0010] A motor assembly, disposed inside the rear end assembly;

[0011] A screw assembly is connected to the motor assembly and is disposed inside the sleeve assembly;

[0012] A coupling assembly is arranged between the motor assembly and the screw assembly, and

[0013] The telescopic tube assembly is arranged between the sleeve assembly and the screw assembly, and a position feedback device is arranged between the sleeve assembly and the telescopic tube assembly.

[0014] Preferably, the position feedback device comprises:

[0015] a potentiometer disposed on the bushing assembly; and

[0016] One end of a plurality of lead wires is connected to the potentiometer, and the other end is connected to the motor assembly.

[0017] Preferably, a spring plunger is provided on the potentiometer.

[0018] Preferably, one end of the spring plunger is fixedly connected to the screw nut of the screw assembly, and the other end thereof is slidably connected to the potentiometer.

[0019] Preferably, a groove is provided on the inner side of the sleeve assembly.

[0020] Preferably, a plate is provided in the groove, and the potentiometer is provided on the plate.

[0021] Preferably, one end of the potentiometer is arranged in the wire groove of the coupling assembly, and the other end passes through the wire groove and is fixedly connected to the plate.

[0022] Preferably, the lead wires are arranged on the periphery of the motor assembly.

[0023] Preferably, the groove is arranged on the same side as the wire slot, and the lead wire, the potentiometer and the mounting plate are in the same plane.

[0024] The beneficial effects of the utility model are:

[0025] (1) The utility model realizes the feedback of the absolute position of the push rod through the potentiometer, which has high precision and very accurate position acquisition. When the push rod is abnormal, the power can be cut off and then powered on, which can achieve the effect of instant start and stop, can be more intuitively displayed, and has high work efficiency.

[0026] (2) The utility model connects the potentiometer and the motor together through lead wires, so that the two share a power supply. There is no need to set up a separate power supply to drive the potentiometer. The structure is simple and the operation is convenient.

[0027] (3) The utility model places the lead wire, the potentiometer and the mounting plate in the same plane so that the three are all in a straight state. They can be approximately regarded as being in the same straight line, so there will be no line bending, and disassembly and assembly are convenient. In addition, the straight state can more intuitively reflect the state of the potentiometer to correspond to the absolute position of the push rod.

[0028] In summary, the utility model has the advantages of fast and accurate positioning, simple structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 It is a cross-sectional view of the utility model;

[0031] Figure 3 for Figure 2 A magnified image of point A;

[0032] Figure 4 for Figure 2 A magnified view of point B;

[0033] Figure 5 This is a schematic diagram of the internal structure of the utility model;

[0034] Figure 6 This is a schematic diagram of the installation of the position feedback device of the utility model;

[0035] Figure 7 This is an exploded view of the position feedback device of the utility model;

[0036] Figure 8 It is a cross-sectional view of the sleeve assembly of the utility model.

[0037] Figure markings: 1-rear end assembly; 2-sleeve assembly; 21-position feedback device; 211-potentiometer; 212-lead wire; 213-spring plunger; 22-groove; 23-plate; 3-motor assembly; 4-screw assembly; 41-screw nut; 5-coupling assembly; 51-wire slot; 6-telescopic tube assembly. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] Example

[0041] like Figure 1-8 As shown, this embodiment provides an electric push rod with an absolute position feedback mechanism, including: a rear end component 1, a sleeve component 2 arranged on one side of the rear end component 1, a motor component 3 arranged inside the rear end component 1, a screw assembly 4 connected to the motor assembly 3, a coupling assembly 5 arranged between the motor assembly 3 and the screw assembly 4, and a telescopic tube assembly 6 arranged between the sleeve component 2 and the screw assembly 4, the screw assembly 4 is arranged inside the sleeve component 2, and a position feedback device 21 is arranged between the sleeve component 2 and the telescopic tube assembly 6. The position feedback device 21 can realize real-time position feedback, so that the push rod can work more smoothly. When a fault occurs, it can also be stopped in time. It is simple to operate and easy to use.

[0042] Among them, the position feedback device 21 includes: a potentiometer 211 and a plurality of lead wires 212 arranged on the sleeve assembly 2, one end of the lead wire 212 is connected to the potentiometer 211, and the other end of the lead wire 212 is connected to the motor assembly 3. The motor assembly 3 provides power to cooperate with the lead wire 212 to drive the potentiometer 211 to work, so as to realize the feedback of the absolute position of the push rod. When the push rod is abnormal, the potentiometer 211 can be used to cut off the power and then power on. The working efficiency is high, and its structure is simple and easy to operate.

[0043] At the same time, the potentiometer 211 is a resistor element with three lead terminals and whose resistance value can be adjusted according to a certain change rule. It is usually composed of a resistor body and a movable brush. When the brush moves along the resistor body, a resistance value or voltage that is related to the displacement amount is obtained at the output end.

[0044] In this embodiment, a spring plunger 213 is provided on the potentiometer 211, one end of the spring plunger 213 is fixedly connected to the lead screw nut 41, and the other end thereof is slidably connected to the potentiometer 211. The spring plunger 213 moves with the lead screw nut 41, and the change in resistance value or voltage caused by the displacement change of the spring plunger 213 is fed back to the potentiometer 211, thereby realizing the feedback of the absolute position of the push rod.

[0045] In this embodiment, a groove 22 is provided on the inner side of the sleeve assembly 2, a plate 23 is provided in the groove 22, the potentiometer 211 is provided on the plate 23, the size of the groove 22 is slightly larger than the size of the plate 23, and the size of the groove 22 is slightly larger than the size of the potentiometer 211, so that the potentiometer 211 can be smoothly installed in the groove 22, and the depth of the groove 22 should be compatible with the sum of the thicknesses of the potentiometer 211 and the plate 23, that is, it is only required that the potentiometer 211 does not affect the movement of the sleeve assembly 2.

[0046] In this embodiment, one end of the potentiometer 211 is arranged in the wire groove 51 of the coupling assembly 5, and the other end passes through the wire groove 51 to be fixedly connected to the plate 23. The potentiometer 211 and the lead wire 212 are both installed in the wire groove 51. The wire groove 51 can completely accommodate the lead wire 212 and the potentiometer 211, which can save space. There is no need to install the potentiometer 211 and the lead wire 212 on the periphery of the coupling assembly 5, so that the entire circuit looks very neat and easy to disassemble and assemble.

[0047] Of course, the lead wire 212 is arranged on the periphery of the motor assembly 3, which is very convenient to install and disassemble. When a fault occurs, it can be quickly and effectively observed whether it is due to a problem with the line, which can avoid the lead wire 212 from becoming messy.

[0048] In addition, the groove 22 is arranged on the same side as the wire groove 51, and the lead wire 212, the potentiometer 211 and the plate 23 are in the same plane, so that the three are all in a straight state. They can be approximately regarded as being in the same straight line, so there will be no line bending, etc., and disassembly and assembly are convenient, and the straight state can more intuitively reflect the state of the potentiometer 211.

[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. An electric push rod with an absolute position feedback mechanism, characterized in that: include: Backend components; A sleeve assembly, arranged on one side of the rear end assembly; A motor assembly, disposed inside the rear end assembly; A screw assembly is connected to the motor assembly and is disposed inside the sleeve assembly; A coupling assembly is arranged between the motor assembly and the screw assembly, and The telescopic tube assembly is arranged between the sleeve assembly and the screw assembly, and a position feedback device is arranged between the sleeve assembly and the telescopic tube assembly.

2. The electric push rod with absolute position feedback mechanism according to claim 1, characterized in that: The position feedback device comprises: a potentiometer disposed on the bushing assembly; and One end of a plurality of lead wires is connected to the potentiometer, and the other end is connected to the motor assembly.

3. The electric push rod with absolute position feedback mechanism according to claim 2, characterized in that: The potentiometer is provided with a spring plunger.

4. The electric push rod with absolute position feedback mechanism according to claim 3, characterized in that: One end of the spring plunger is fixedly connected to the screw nut of the screw assembly, and the other end of the spring plunger is slidably connected to the potentiometer.

5. The electric push rod with absolute position feedback mechanism according to claim 2, characterized in that: A groove is arranged on the inner side of the sleeve assembly.

6. The electric push rod with absolute position feedback mechanism according to claim 5, characterized in that: A pasting plate is arranged in the groove, and the potentiometer is arranged on the pasting plate.

7. The electric push rod with absolute position feedback mechanism according to claim 6, characterized in that: One end of the potentiometer is arranged in the wire groove of the coupling assembly, and the other end passes through the wire groove and is fixedly connected to the plate.

8. The electric push rod with absolute position feedback mechanism according to claim 2, characterized in that: The lead wires are arranged on the periphery of the motor assembly.

9. The electric push rod with absolute position feedback mechanism according to claim 7, characterized in that: The groove is arranged on the same side as the wire-passing slot, and the lead-out wire, the potentiometer and the mounting plate are located on the same plane.

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