An electric push rod with precise stroke control

Abstract

The present invention relates to the technical field of electric push rods, and in particular to an electric push rod with precisely controlled stroke, which includes a shell with a transmission assembly provided in the shell; a sleeve connected to one end of the shell; a telescopic assembly provided in the sleeve, and connected to a switch assembly through transmission with the output end of the transmission assembly; the transmission assembly includes a drive motor, which is a motor with dual output ends; and a stroke control assembly provided at the tail end of the shell; the stroke control assembly is used to precisely control the stroke of the electric push rod; the pressure of the detection assembly is changed by changing the stroke of the detection assembly, and the pressure change is used to cooperate with the detection element to achieve high-precision detection of the stroke of the electric push rod, thereby solving the technical problem of low detection accuracy in the prior art; at the same time, the present application arranges the stroke control assembly at the tail end of the electric push rod, which not only reduces the lead length, but also reduces the diameter size of the electric push rod, thereby realizing a push rod that meets special size requirements of the present application.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and in particular to an electric push rod with precisely controlled stroke. Background Art

[0002] The electric push rod adopts a worm gear or gear transmission to achieve linear motion through a lead screw nut. The stroke control of the electric push rod is detected and controlled by mechanical limit, encoder and Hall feedback, PLC and controller.

[0003] Chinese patent CN202022043505.X discloses a high-load electric push rod, including a sleeve assembly, an inner tube assembly sleeved in the sleeve assembly and with the front end extending through the sleeve assembly, a transmission mechanism for driving the inner tube assembly to perform telescopic movement, and a drive unit fixedly connected to the rear end of the sleeve assembly. The transmission mechanism includes a transmission screw sleeved in the inner tube assembly, and also includes a thrust plate installed on the rear end shaft neck of the transmission screw with an interference fit and used for bearing and transmitting axial load force; by optimizing the design of a new type of elastic retaining ring, namely the thrust plate, and installing it on the rear end of the transmission screw with an interference fit, the thrust plate can provide a larger axial and radial preload, effectively replacing the load-bearing of the original push plate, reducing the wear of components, and has a simple structure, low cost, and convenient and time-saving installation.

[0004] However, the control component of this technical solution is between the motor and the lead screw, and the control line needs to be passed along the inner wall of the sleeve component. During the assembly process, due to manual operation errors, the lead wire is easily squeezed or ground, causing the lead wire to be damaged, affecting the detection accuracy or even losing the detection accuracy, and unable to achieve high-precision detection of the stroke of the electric push rod. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the existing technology and provide an electric push rod with precise stroke control. The pressure of the detection component can be changed by changing the stroke of the detection component. The pressure change is combined with the detection element to achieve high-precision detection of the stroke of the electric push rod. Compared with the prior art using Hall detection, the present application has the function of confirming the specific position of the electric push rod after power is cut off and then turned on again, avoiding the technical problem that the Hall detection method cannot correctly judge the position of the electric push rod after power is cut off. At the same time, the present application arranges the stroke control component at the tail end of the electric push rod, which not only reduces the lead length, but also reduces the diameter size of the electric push rod, so that the present application can achieve a push rod that meets special size requirements.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric push rod for precisely controlling stroke, comprising:

[0008] a housing, wherein a transmission assembly is disposed within the housing;

[0009] a sleeve connected to one end of the housing;

[0010] a telescopic assembly, the telescopic assembly being disposed in the sleeve and being in transmission connection with the output end of the transmission assembly;

[0011] A switch assembly, used to control the travel of the telescopic assembly;

[0012] The transmission assembly includes a drive motor, which is a motor with two output ends; the telescopic assembly is connected to the drive motor through a reducer;

[0013] It also includes a stroke control component that is arranged at the rear end of the shell and is transmission-connected to the transmission component; the stroke control component is used to accurately control the stroke of the electric push rod.

[0014] As an improvement, the stroke control component converts the rotation distance of the motor into pressure changes, and determines the actual stroke of the electric push rod by detecting the pressure.

[0015] As an improvement, the stroke control component includes:

[0016] a support shaft mounted on an end portion of the drive motor;

[0017] a gear shaft, the gear shaft being rotatably mounted on the support shaft and having external teeth;

[0018] A worm, the worm being sleeved on the gear shaft and rotating synchronously with the gear shaft;

[0019] a multi-stage reduction assembly, wherein the input end of the multi-stage reduction assembly is connected to the output end of the drive motor, and the output end is drivingly connected to the gear shaft;

[0020] and a detection component, wherein the detection component is used to detect the rotational displacement of the drive motor.

[0021] As an improvement, the stroke control component drives the volume change of the detection component to change the internal pressure of the detection component, thereby determining the stroke of the electric push rod.

[0022] As an improvement, the detection component includes:

[0023] A detection base, the detection base being installed on one side of the drive motor;

[0024] A detection element is installed at the inner bottom end of the detection base and detects the stroke of the electric push rod through pressure changes;

[0025] A guide cylinder is mounted on one side of the detection base and forms an internal closed space with the detection base, wherein hydraulic oil is provided in the closed space;

[0026] A push rod piston, wherein the push rod piston is slidably arranged on the inner wall of the guide cylinder, one end of the push rod piston passes through the guide cylinder, and the push rod piston reciprocates to change the pressure in the enclosed space;

[0027] and an adjusting block, wherein the adjusting block is connected to the worm gear transmission and the other end is connected to the push rod piston.

[0028] As an improvement, the detection assembly further includes guide rods arranged on the outer wall of the guide cylinder; the adjustment block is slidably arranged between the guide rods.

[0029] As an improvement, the multi-stage reduction assembly is formed by multiple gears meshing with each other, which includes a transmission gear connected to the output end of the drive motor in the middle, and multiple sets of coaxially connected first large gears and first small gears.

[0030] As an improvement, the telescopic assembly includes:

[0031] A screw rod connected to an output end of the transmission assembly;

[0032] A transmission nut, the transmission nut being threadably connected to the lead screw, and the outer side of the transmission nut being slidably connected to the sleeve;

[0033] and a telescopic tube, wherein the telescopic tube is connected to the transmission nut and reciprocates along with the transmission nut.

[0034] As an improvement, the switch assembly includes a limit switch for limiting the maximum stroke and the minimum stroke of the telescopic tube.

[0035] As an improvement, it also includes a protective component for isolating the stroke control component, the protective component includes a base plate connected to the drive motor, a protective cover covering the stroke control component, and the outer side of the protective cover is provided with a groove for passing the wire.

[0036] The beneficial effects of the present invention are:

[0037] (1) The present invention reduces the lead length of the stroke control component by arranging the control component at the tail end of the electric push rod, thereby avoiding the prior art method of routing the wires on the side of the inner wall of the electric push rod, which causes the wire sheath of the wire to be damaged due to operational errors during the assembly and use of the electric push rod, thereby causing damage to the lead of the control component, causing external factors to affect the signal transmission accuracy, resulting in low stroke control accuracy of the electric push rod.

[0038] (2) The present invention arranges the forming control component at the tail end of the push rod, eliminating the need to run wires inside the push rod, thereby reducing the diameter of the push rod. For working conditions with special size requirements, greater output power can be provided under the same size conditions.

[0039] (3) The present invention converts the linear motion of the driving motor into the stroke of the detection component, and changes the pressure of the detection component by changing the stroke of the detection component. The pressure change is combined with the detection element to achieve high-precision detection of the stroke of the electric push rod. Compared with the existing technology using Hall detection, the present application has the function of confirming the specific position of the electric push rod after power is turned off and then on again, thus avoiding the technical problem that the Hall detection method cannot correctly determine the position of the electric push rod after power is turned off.

[0040] (4) The present invention converts the rotation distance of the motor into the stroke change of the detection component through a multi-stage reduction structure, and uses a dual-output motor to realize the drive screw transmission at one end and the detection and control of the screw transmission distance at the other end.

[0041] (5) The present invention drives the push rod piston to move back and forth through the regulating block to achieve pressure changes in the enclosed space, cooperates with the detection element for detecting pressure changes in the enclosed space to achieve accurate detection of the stroke position of the electric push rod, and cooperates with the control board to accurately control the stroke of the electric push rod.

[0042] In summary, the present invention has the advantages of high detection accuracy and small external influence factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0045] Figure 3 This is a schematic diagram of the protective component of the present invention;

[0046] Figure 4 This is a schematic diagram of the stroke control assembly of the present invention;

[0047] Figure 5 For the present invention Figure 2 A partial enlarged schematic diagram of point I in the middle;

[0048] Figure 6 For the present invention Figure 2 A partial enlarged schematic diagram of point II in the middle;

[0049] Figure 7 It is a cross-sectional schematic diagram of the stroke control assembly of the present invention.

[0050] Reference numerals:

[0051] 1. Housing; 2. Transmission assembly; 21. Drive motor; 22. Reducer; 3. Sleeve; 31. Positioning piece; 32. Guide ring; 33. Sealing ring; 4. Telescopic assembly; 41. Screw; 42. Transmission nut; 43. Telescopic tube; 5. Switch assembly; 6. Stroke control assembly; 61. Support shaft; 62. Gear shaft; 63. Worm; 64. Multi-stage reduction assembly; 641. Transmission gear; 642. First large gear; 643. First small gear; 65. Detection assembly; 651. Detection base; 652. Detection element; 653. Guide cylinder; 654. Push rod piston; 655. Adjustment block; 656. Guide rod; 7. Protection assembly; 71. Bottom plate; 72. Protective cover; 721. Groove. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] In the description of the present invention, 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 to 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0054] Example 1

[0055] like Figure 1-Figure 2 As shown, this embodiment provides an electric push rod for precisely controlling travel, comprising:

[0056] A housing 1, wherein a transmission assembly 2 is provided in the housing 1;

[0057] a sleeve 3 connected to one end of the housing 1;

[0058] The telescopic assembly 4 is disposed in the sleeve 3 and is in transmission connection with the output end of the transmission assembly 2. The transmission assembly 2 controls the extension / retraction of the telescopic tube 43, thereby changing the stroke of the electric push rod. The sleeve 3 guides the reciprocating motion of the telescopic assembly 4.

[0059] A switch assembly 5 is provided between the telescopic assembly 4 and the transmission assembly 2 and is used to control the travel of the telescopic assembly 4;

[0060] The transmission assembly 2 includes:

[0061] The drive motor 21 is a motor with two output ends; the telescopic assembly 4 is connected to the drive motor 21 through a reducer 22; specifically, by adopting the dual-output drive motor 21, accurate detection of motor rotation is achieved, that is, the two ends of the motor are simultaneously connected to the detection mechanism and the drive mechanism, achieving synchronization of detection and transmission, thereby achieving accurate detection of the stroke of the electric push rod;

[0062] It also includes a stroke control component 6 that is arranged at the rear end of the housing 1 and is transmission-connected to the transmission component 2; the stroke control component 6 is used to accurately control the stroke of the electric push rod.

[0063] It should be noted that the stroke control component 6 is installed at the tail end of the housing 1 to reduce the length of the connecting wire of the stroke control component 6 and avoid problems such as the stroke control component 6 being squeezed and damaged during the assembly and application process due to the wire being too long during installation, thereby affecting the stroke control accuracy of the electric push rod.

[0064] Preferably, the stroke control component 6 converts the rotation distance of the motor into pressure change, and determines the actual stroke of the electric push rod by detecting the pressure.

[0065] Specifically, the present application converts the rotation distance of the motor into the stroke of the hydraulic component through a deceleration structure, thereby changing the pressure inside the hydraulic component. The different pressures are detected by the pressure sensing element arranged inside the hydraulic component, so as to judge the specific stroke of the electric push rod. At the same time, the different pressures are reversely inferred as the stroke distance. The specific parameters can be calculated by the engineer before leaving the factory and informed to the user, or the parameter data can be written into the processor for real-time retrieval.

[0066] Preferably, the telescopic assembly 4 includes:

[0067] A screw rod 41 connected to the output end of the transmission assembly 2;

[0068] A transmission nut 42 is threadedly connected to the screw rod 41. The outer side of the transmission nut 42 is slidably connected to the sleeve 3. Specifically, a guide groove is provided on the transmission nut 42, and a guide protrusion is provided on the inner wall of the sleeve 3. The guide groove is slidably provided on the guide protrusion, so that the transmission nut 42 can perform reciprocating linear motion along the sleeve 3, thereby preventing the transmission nut 42 from rotating, thereby driving the telescopic tube 43 to move back and forth;

[0069] The telescopic tube 43 is connected to the transmission nut 42 and reciprocates with the transmission nut 42 .

[0070] Further, such as Figure 5 As shown, the end of the sleeve 3 is also provided with a positioning member 31 for guiding and sealing the telescopic tube 43. The positioning member 31 is connected to the sleeve 3, and the inner wall of the positioning member 31 abuts against the telescopic tube 43. A plurality of sealing rings 33 and a guide ring 32 are provided between the two to achieve high-precision guiding and sealing of the telescopic tube 43.

[0071] Preferably, the switch assembly 5 includes a limit switch for limiting the maximum stroke and minimum stroke of the telescopic tube 43. Specifically, the maximum stroke limit switch is provided at the protruding end of the telescopic tube 43. When the telescopic tube 43 extends outward and squeezes the maximum stroke limit switch, the telescopic tube 43 triggers a protection mechanism to prevent the telescopic tube 43 from continuing to extend and causing damage to the electric push rod. Similarly, when the telescopic tube 43 runs to the minimum stroke, the minimum stroke limit switch is squeezed to stop the electric push rod from running, thereby preventing the telescopic tube 43 from damaging the internal structure of the push rod piston 654.

[0072] Example 2

[0073] like Figure 4 、 Figure 6 、 Figure 7 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0074] In this embodiment, the stroke control component 6 includes:

[0075] a support shaft 61 , the support shaft 61 being mounted on an end portion of the drive motor 21 ;

[0076] A gear shaft 62 rotatably mounted on the support shaft 61 and having external teeth;

[0077] The worm 63 is sleeved on the gear shaft 62 and rotates synchronously with the gear shaft 62. Specifically, the outer diameter surface of one end of the gear shaft 62 is provided with a flat structure, and the inner diameter of the worm 63 is provided with a flat groove adapted to the flat structure, so that the worm 63 rotates synchronously with the gear shaft 62.

[0078] a multi-stage reduction assembly 64 , wherein the input end of the multi-stage reduction assembly 64 is connected to the output end of the drive motor 21 , and the output end is in driving connection with the gear shaft 62 ;

[0079] and a detection component 65 , wherein the detection component 65 is used to detect the rotational displacement of the drive motor 21 .

[0080] Preferably, the stroke control component 6 determines the stroke of the electric push rod by driving the volume change of the detection component 65 to change the internal pressure of the detection component 65.

[0081] Example 3

[0082] like Figure 7 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For simplicity, only the differences from the first embodiment are described below. The differences between the third embodiment and the first embodiment are:

[0083] In this embodiment, the detection component 65 includes:

[0084] A detection base 651 , the detection base 651 being installed on one side of the drive motor 21 ;

[0085] The detection element 652 is mounted on the inner bottom end of the detection base 651 and detects the stroke of the electric push rod through pressure changes. Specifically, the detection element 652 can be a pressure sensor. The pressure sensor detects internal pressure changes and transmits the data to the PCB for identification, thereby determining the stroke position of the electric push rod. The pressure sensor can be a combination of one or more types such as a strain gauge pressure sensor, a piezoelectric sensor, and a capacitive pressure sensor to detect pressure changes in a confined space.

[0086] A guide cylinder 653 is mounted on one side of the detection base 651 and forms an internal closed space with the detection base 651. Hydraulic oil is provided in the closed space.

[0087] A push rod piston 654 is slidably mounted on the inner wall of the guide cylinder 653 , with one end of the push rod piston 654 passing through the guide cylinder 653 . The push rod piston 654 reciprocates to change the pressure in the enclosed space.

[0088] The regulating block 655 is connected to the worm 63 in a transmission manner, and the other end of the regulating block 655 is connected to the push rod piston 654 .

[0089] It should be noted that the rotation of the worm 63 drives the adjustment block 655 to move back and forth, thereby driving the push rod piston 654 to move back and forth, so that the circumferential motion of the worm 63 is converted into the linear motion of the adjustment block 655, thereby changing the pressure in the confined space. The stroke of the electric push rod is determined by the pressure change detected by the detection element 652. The method of determining the stroke of the push rod piston 654 in this application is significantly different from the existing method of using limit switches and Hall detection positions. Specifically, the Hall detection position is a relative position detection. When a power outage occurs, after the electric push rod is turned on again, the Hall detection cannot determine the real-time position of the electric push rod, that is, the Hall sensor does not know the position of the push rod piston 654 after the power is turned on again, resulting in the inability to perform subsequent judgments normally, such as disengagement or jamming.

[0090] In addition, the Hall sensor has high requirements for environmental working conditions. For some working conditions with strong magnetic fields that greatly interfere with the normal operation of the Hall sensor, the Hall sensor cannot perform high-precision stroke detection.

[0091] However, the present application adopts the method of determining the stroke position of the push rod piston 654 by pressure change, which has high detection accuracy, is applicable to special working conditions, and the control accuracy is less affected by external factors.

[0092] Furthermore, the detection assembly 65 further includes guide rods 656 disposed on the outer wall of the guide cylinder 653 ; the adjustment block 655 is slidably disposed between the guide rods 656 .

[0093] It should be noted that, by providing the guide rod 656 , the adjustment block 655 can move back and forth smoothly, thereby improving the stroke control accuracy of the push rod piston 654 .

[0094] Example 4

[0095] like Figure 4 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The fourth embodiment differs from the first embodiment in that:

[0096] In this embodiment, the multi-stage reduction assembly 64 is formed by multiple gears meshing with each other, which includes a transmission gear 641 connected to the output end of the drive motor 21 in the middle, and multiple groups of coaxially connected first large gears 642 and first small gears 643.

[0097] It should be noted that the transmission gear 641 is engaged with the first large gear 642, the first small gear 643 is engaged with the first large gear 642 of another group, and the first large gear 642 is engaged with the first small gear 643 of another group to achieve step-by-step deceleration; the first small gear 643 of the last group is engaged with the external teeth on the gear shaft 62, thereby driving the worm 63 to rotate.

[0098] Example 5

[0099] like Figure 3 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The differences between the fifth embodiment and the first embodiment are as follows:

[0100] In this embodiment, a protective component 7 for isolating the stroke control component 6 is also included. The protective component 7 includes a base plate 71 connected to the drive motor 21, and a protective cover 72 covering the stroke control component 6. The outer side of the protective cover 72 is provided with a groove 721 for passing the wire, and the lead is arranged in the groove 721 to prevent the lead from being squeezed and worn during the assembly process.

[0101] Specifically, one end of the stroke control component 6 passes through the bottom plate 71 and is connected to the drive motor 21. By providing the protection component 7, the cleanliness of the operating environment of the stroke control component 6 is improved, and the transmission accuracy is improved.

[0102] 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 scope of protection of the present invention.

Claims

1. An electric push rod for precisely controlling travel, comprising: A housing (1), wherein a transmission assembly (2) is provided in the housing (1); a sleeve (3), the sleeve (3) being connected to one end of the housing (1); a telescopic assembly (4), the telescopic assembly (4) being arranged in the sleeve (3) and being in transmission connection with the output end of the transmission assembly (2); A switch assembly (5) for controlling the travel of the telescopic assembly (4); It is characterized in that the transmission assembly (2) includes a drive motor (21), and the drive motor (21) is a motor with two output ends; the telescopic assembly (4) is connected to the drive motor (21) through a reducer (22); It also includes a stroke control component (6) disposed at the rear end of the housing (1) and connected to the transmission component (2); the stroke control component (6) is used to accurately control the stroke of the electric push rod; The stroke control component (6) converts the rotation distance of the motor into pressure change, and determines the actual stroke of the electric push rod by detecting the pressure; The stroke control component (6) includes a worm (63) and a detection component (65), wherein the detection component (65) is used to detect the rotational displacement of the drive motor (21); The detection component (65) includes: A detection base (651), the detection base (651) being mounted on one side of the drive motor (21); A detection element (652), the detection element (652) is mounted on the inner bottom end of the detection base (651), and detects the stroke of the electric push rod through pressure changes; A guide cylinder (653), the guide cylinder (653) being mounted on one side of the detection base (651) and forming an internal closed space with the detection base (651), wherein hydraulic oil is provided in the closed space; A push rod piston (654), wherein the push rod piston (654) is slidably disposed on the inner wall of the guide cylinder (653), one end of the push rod piston (654) passes through the guide cylinder (653), and the push rod piston (654) reciprocates to change the pressure of the enclosed space; and an adjusting block (655), wherein the adjusting block (655) is drivingly connected to the worm (63), and the other end is connected to the push rod piston (654); The stroke control component (6) drives the volume change of the detection component (65), changes the internal pressure of the detection component (65), and thus determines the stroke of the electric push rod.

2. The electric push rod for precise stroke control according to claim 1, characterized in that: The stroke control component (6) further includes: A support shaft (61), the support shaft (61) being mounted on an end portion of the drive motor (21); a gear shaft (62), the gear shaft (62) being rotatably mounted on the support shaft (61) and having external teeth; the worm (63) being sleeved on the gear shaft (62) and rotating synchronously with the gear shaft (62); and a multi-stage reduction assembly (64), wherein the input end of the multi-stage reduction assembly (64) is connected to the output end of the drive motor (21), and the output end is transmission-connected to the gear shaft (62).

3. The electric push rod for precise stroke control according to claim 1, characterized in that: The detection assembly (65) further includes guide rods (656) disposed on the outer wall of the guide cylinder (653); the adjustment block (655) is slidably disposed between the guide rods (656).

4. The electric push rod for precise stroke control according to claim 2, characterized in that: The multi-stage reduction assembly (64) is formed by a plurality of gears meshing with each other, and comprises a transmission gear (641) whose middle portion is connected to the output end of the drive motor (21), and a plurality of sets of first large gears (642) and first small gears (643) connected coaxially.

5. The electric push rod for precise stroke control according to claim 1, characterized in that: The telescopic assembly (4) comprises: A screw rod (41), the screw rod (41) being connected to an output end of the transmission assembly (2); A transmission nut (42), the transmission nut (42) is threadedly connected to the screw rod (41), and the outer side of the transmission nut (42) is slidably connected to the sleeve (3); and a telescopic tube (43), wherein the telescopic tube (43) is connected to the transmission nut (42) and reciprocates along with the transmission nut (42).

6. The electric push rod for precise stroke control according to claim 5, characterized in that: The switch assembly (5) includes a limit switch for limiting the maximum stroke and the minimum stroke of the telescopic tube (43).

7. The electric push rod for precise stroke control according to claim 1, characterized in that: The invention also includes a protective component (7) for isolating the stroke control component (6), wherein the protective component (7) includes a base plate (71) connected to the drive motor (21), a protective cover (72) covering the stroke control component (6), and a groove (721) for passing a wire is provided on the outer side of the protective cover (72).

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