Electric push rod stroke on-line rapid adjusting method and electric push rod

Abstract

The invention provides an electric push rod stroke on-line rapid adjustment method which comprises the following steps: rapid adjustment of the minimum installation distance of a telescopic pipe: opening a cover plate of an adjustment window, shifting an upper adjustment disc, and changing the distance of a first induction block on the upper adjustment disc relative to a limit switch; a cover plate of an adjusting window is opened, a lower adjusting disc is rotated, an upper adjusting disc is kept still, and the relative position of a second induction block on the lower adjusting disc and a limiting switch is changed; the distance of the adjusting disc relative to the limiting switch is changed in a rotating mode of the adjusting disc, efficient and stepless full-stroke adjustment is achieved, meanwhile, by means of the adjusting window capable of being opened, sealing and water proofing are achieved after adjustment is completed, the waterproof device is suitable for the higher waterproof grade, and the problem that in the prior art, the waterproof effect is poor is solved. And the technical problems that full-stroke stepless adjustment cannot be achieved and the waterproof grade is poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and in particular to an online rapid adjustment method for the stroke of an electric push rod and an electric push rod. Background Art

[0002] The stroke adjustment of the electric push rod is a key operation process, which determines the motion range and position accuracy of the electric push rod. The stroke of the electric push rod is generally controlled by the limit switch. By adjusting the position of the limit switch or setting the parameters of the encoder, the stroke of the electric push rod can be accurately adjusted.

[0003] Chinese patent CN210404974U discloses a stroke-adjustable electric push rod, comprising a motor, a cylinder body, a front cover, a rear cover and a push rod, the front cover and the rear cover are respectively covered at both ends of the cylinder body, the push rod is movably arranged in the cylinder body, the outer end of the push rod axially extends out of the cylinder body and slides with the front cover, the push rod is provided with a matching lead screw nut and a lead screw, the rear cover is provided with a meshing worm and a worm wheel, a stroke switch is provided between the push rod and the cylinder body, buttons are provided on the stroke switch, a trigger body for triggering the button is provided on the lead screw nut, a slide rail is provided on the cylinder body, a plurality of opening grooves are provided on the slide rail, a slide seat slidingly matched with the slide rail is provided on the stroke switch, the slide seat passes through the slide rail and extends to the outside of the cylinder body, a locking block hinged with the slide seat is provided on the outside of the cylinder body, the end of the locking block is locked with the opening groove, and a reset spring is provided between the locking block and the stroke switch. The utility model has the advantages of simple and compact structure and convenient stroke adjustment.

[0004] However, this technical solution uses a slide rail in combination with an open slot to achieve online adjustment. However, it is a segmented adjustment and cannot achieve full-stroke adjustment. At the same time, the slide slot structure cannot achieve a high waterproof level and cannot be used in working conditions with a high waterproof level. Summary of the invention

[0005] The purpose of the present invention is to provide an online rapid adjustment method for the stroke of an electric push rod in view of the deficiencies in the prior art, which adopts the method of rotating an adjusting disk to change the distance of the adjusting disk relative to a limit switch, thereby achieving efficient and stepless full-stroke adjustment. At the same time, an openable adjustment window is utilized to achieve sealing and waterproofing after the adjustment is completed, thereby achieving a higher waterproof grade, thereby solving the technical problems in the prior art of being unable to achieve stepless adjustment of the full stroke and having a poor waterproof grade.

[0006] To achieve the above object, the present invention provides the following technical solutions: A method for online rapid adjustment of electric push rod stroke A method for online rapid adjustment of electric push rod stroke, characterized in that it comprises the following steps: Quick adjustment of the minimum installation distance of the telescopic tube: open the cover of the adjustment window, turn the upper adjustment disk, change the distance between the first sensor block on the upper adjustment disk and the limit switch, and the telescopic tube of the motor runs to the minimum extension position to detect the minimum installation distance of the telescopic tube. When the minimum installation distance meets the requirements, the adjustment of the minimum installation distance of the telescopic tube is completed; Quick adjustment of the telescopic tube stroke: open the cover of the adjustment window, turn the lower adjustment disk, keep the upper adjustment disk stationary, change the relative position of the second sensing block on the lower adjustment disk and the limit switch, the telescopic tube of the motor runs to the maximum extension position, detect the maximum travel distance of the telescopic tube, and complete the quick adjustment of the telescopic tube stroke after the maximum travel meets the set value.

[0007] As an improvement, it also includes fine-tuning the minimum installation distance. Turning the second adjusting knob drives the second adjusting rod to move to the right, so that the second adjusting gear and the first external tooth engage and transmit. Turning the second adjusting knob changes the position of the upper adjusting disk relative to the limit switch to complete the fine-tuning of the telescopic tube stroke.

[0008] As an improvement, it also includes fine adjustment of the telescopic tube stroke: turning the first adjusting knob drives the first adjusting rod to move to the right, so that the first adjusting gear engages with the second internal gear, turning the first adjusting knob drives the lower adjusting disk to rotate, changing the position of the lower adjusting disk relative to the limit switch, and completing the fine adjustment of the minimum installation distance.

[0009] As an improvement, in the telescopic tube stroke fine adjustment step, the friction coefficient of the second friction plate is smaller than the friction coefficient of the first friction plate, and when the lower adjustment plate is turned, the upper adjustment plate remains stationary.

[0010] As an improvement, in the minimum installation distance fine adjustment step, the friction coefficient of the second friction plate is smaller than the friction coefficient of the first friction plate, and during the rotation of the upper adjustment plate, the lower adjustment plate rotates synchronously with the upper adjustment plate.

[0011] As an improvement, in the step of quickly adjusting the minimum installation distance of the telescopic tube, while turning the upper adjustment disk, the lower adjustment disk is pressed to ensure that the lower adjustment disk does not move.

[0012] As an improvement, scale lines for visually adjusting the distance are provided on the outer sides of the upper adjustment disk and the lower adjustment disk.

[0013] Another object of the present invention is to provide an electric push rod to address the deficiencies in the prior art, and to use the above-mentioned adjustment method to achieve rapid adjustment of the stroke of the electric push rod.

[0014] To achieve the above object, the present invention provides the following technical solutions: An electric push rod, characterized in that the stroke of the electric push rod is adjusted by using the above-mentioned method for online rapid adjustment of the stroke of the electric push rod, the electric push rod comprises a housing, a sleeve, a transmission assembly, a telescopic tube assembly, a switch assembly, a detection assembly and a fine adjustment assembly; The transmission assembly includes a screw rod; The telescopic tube assembly includes a telescopic tube; The detection assembly comprises: an inner gear ring, a multi-stage reduction gear, an upper adjustment disk and a lower adjustment disk; the input end of the multi-stage reduction gear meshes with the lead screw for transmission, and the output end of the multi-stage reduction gear meshes with the first internal tooth of the inner gear ring for transmission, and the inner gear ring drives the upper adjustment disk and the lower adjustment disk to rotate synchronously in turn; The upper adjusting disk is provided with a first external tooth, and one side of the upper adjusting disk is provided with a first sensing block for sensing with a limit switch. The inner diameter surface of the lower adjusting disk is provided with a second inner tooth, and the inner diameter of one end thereof is provided with a second sensing block for sensing with a limit switch; A first friction plate is provided between the inner gear ring and the upper adjusting plate; A second friction plate is provided between the upper adjusting plate and the lower adjusting plate; The friction coefficient of the second friction plate is smaller than the friction coefficient of the first friction plate.

[0015] As an improvement, the fine adjustment assembly includes a first adjustment rod for adjusting the travel of the telescopic tube and a second adjustment rod for adjusting the minimum installation distance of the telescopic tube.

[0016] As an improvement, a first adjusting gear is provided at the end of the first adjusting rod; the first adjusting gear is meshed with the second internal gear for transmission; and a first adjusting knob is also provided on the first adjusting rod; A second adjusting gear is disposed at the end of the second adjusting rod; the second adjusting gear is meshed with the first external teeth for transmission; and a second adjusting knob is also disposed on the second adjusting rod.

[0017] The beneficial effects of the present invention are: (1) The present invention achieves stepless adjustment of the entire stroke of the electric push rod by changing the distance relative to the limit switch by rotating the upper adjustment disk and the lower adjustment disk. At the same time, the stroke of the electric push rod can be quickly adjusted by toggling the upper adjustment disk and the lower adjustment disk. After the adjustment is completed, the waterproof level of the electric push rod reaches IP68 or higher by closing and sealing the adjustment window, thereby solving the technical problems in the prior art of slow stroke adjustment, inability to achieve full stroke adjustment, and poor waterproof level.

[0018] (2) The present invention realizes controlling the travel and minimum installation distance of the telescopic tube by means of the detection component. At the same time, the travel and minimum installation distance of the telescopic tube can be quickly and roughly adjusted by means of the detection component to solve the technical problems in the prior art that the travel and minimum installation distance of the electric push rod are slow to adjust and inconvenient to adjust online. At the same time, the fine adjustment component is used to accurately adjust the travel and minimum installation distance of the telescopic tube by means of a small gear driving a large gear to rotate in conjunction with the scale lines on the adjustment disk, thereby solving the problem of inaccurate manual coarse adjustment of the position.

[0019] (3) The present invention converts the rotation distance of the screw into the rotation distance of the upper adjustment disk and the lower adjustment disk through a multi-stage reduction gear, thereby realizing the minimum installation distance and stroke position detection. The detection mechanism is built into the electric push rod, which improves the application scope of the electric push rod, especially for occasions with high requirements for waterproofing.

[0020] (4) The present invention realizes the connection of the adjacent inner gear ring and the upper adjustment plate into an integral structure by setting the first elastic limiter and the first positioning groove, thereby realizing synchronous rotation. The setting of the first friction plate between the two further ensures that the two can rotate synchronously.

[0021] (5) The present invention uses a clamping assembly to tightly clamp the inner gear ring, the upper adjustment plate and the lower adjustment plate, thereby ensuring that the three rotate synchronously during the normal operation of the electric push rod, thereby realizing the stroke detection of the electric push rod.

[0022] (6) The present invention reduces the friction between the lower adjustment disk and the upper switch seat and between the elastic pressing member and the inner gear ring by providing a connecting member, thereby ensuring that the upper adjustment disk, the lower adjustment disk and the inner gear ring rotate stably and synchronously, thereby improving the stroke detection accuracy.

[0023] (7) The present invention provides an openable adjustment window on the electric push rod, thereby facilitating rapid online adjustment of the stroke of the electric push rod, thereby improving the application range of the electric push rod, especially for working conditions that require frequent stroke adjustment.

[0024] In summary, the present invention has the advantages of being able to adjust the stroke of the push rod online, the minimum installation distance, fast adjustment speed, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic cross-sectional view of the whole of the present invention; Figure 4 This is a schematic diagram of the installation of the switch assembly and the detection assembly of the present invention; Figure 5 This is a schematic diagram of the structure of the inner gear ring of the present invention; Figure 6 This is a schematic diagram of the upper adjustment disk of the present invention; Figure 7 It is a cross-sectional schematic diagram of the lower adjustment disk of the present invention; Figure 8 This is a schematic diagram of the installation of the fine adjustment component of the present invention; Fig. 9 It is a cross-sectional schematic diagram of the detection assembly of the present invention; Fig.10 It is a schematic diagram of installing a first elastic limiting member on the inner gear ring of the present invention; Fig.11 It is a partial enlarged schematic diagram of the fine adjustment component of the present invention; Fig.12 for Figure 3 A partial enlarged schematic diagram in the middle; Fig.13 for Fig. 9 A partial enlarged schematic diagram of point B in the middle; Fig.14 for Fig. 9 A partial enlarged schematic diagram of point C in the middle; Fig.15 for Fig. 9 The local enlarged schematic diagram of point D in the middle; Fig.16 for Fig. 9 A partial enlarged schematic diagram of point E in the middle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] 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 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, rather than indicating or implying 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 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 invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] Embodiment 1 like Figure 1 As shown, this embodiment provides a method for online rapid adjustment of the stroke of an electric push rod, comprising the following steps: Quick adjustment of the minimum installation distance of the telescopic tube: open the cover of the adjustment window 31, turn the upper adjustment disk 73, change the distance between the first sensing block 738 on the upper adjustment disk 73 and the limit switch 64, the telescopic tube 52 of the motor runs to the minimum extension position, and the minimum installation distance of the telescopic tube is detected. When the minimum installation distance meets the requirements, the adjustment of the minimum installation distance of the telescopic tube 52 is completed; Rapid adjustment of the telescopic tube stroke: open the cover of the adjustment window 31, rotate the lower adjustment disk 74, keep the upper adjustment disk 73 stationary, change the relative position of the second sensing block 747 on the lower adjustment disk 74 and the limit switch 64, and run the telescopic tube 52 of the motor to the maximum extension position, detect the maximum travel distance of the telescopic tube, and complete the rapid adjustment of the telescopic tube stroke after the maximum travel meets the set value; As an improvement, it also includes fine adjustment of the minimum installation distance. The second adjustment knob 822 is turned to drive the second adjustment rod 82 to move to the right, so that the second adjustment gear 821 and the first outer tooth 736 are engaged for transmission. The second adjustment knob 822 is turned to change the position of the upper adjustment disk 73 relative to the limit switch 64, thereby completing the fine adjustment of the travel of the telescopic tube 52.

[0029] As an improvement, it also includes fine adjustment of the telescopic tube stroke: turning the first adjusting knob 812 drives the first adjusting rod 81 to move to the right, so that the first adjusting gear 811 engages with the second inner tooth 745, and rotating the first adjusting knob 812 drives the lower adjusting disk 74 to rotate, thereby changing the position of the lower adjusting disk 74 relative to the limit switch 64, thereby completing the fine adjustment of the minimum installation distance.

[0030] Preferably, in the step of finely adjusting the telescopic tube stroke, the friction coefficient of the second friction plate 78 is smaller than the friction coefficient of the first friction plate 77, and when the lower adjustment plate 74 is turned, the upper adjustment plate 73 remains stationary.

[0031] Preferably, in the minimum installation distance fine adjustment step, the friction coefficient of the second friction plate 78 is smaller than the friction coefficient of the first friction plate 77 , and during the rotation of the upper adjustment plate 73 , the lower adjustment plate 74 rotates synchronously with the upper adjustment plate 73 .

[0032] Preferably, in the step of quickly adjusting the minimum installation distance of the telescopic tube, during the process of turning the upper adjustment disk 73, the lower adjustment disk 74 is pressed to ensure that the lower adjustment disk 74 does not move.

[0033] Preferably, scale lines for visually adjusting the distance are provided on the outer sides of the upper adjustment disk 73 and the lower adjustment disk 74 .

[0034] Embodiment 2 like Figure 2-Figure 16 The present embodiment provides an electric push rod, which uses the electric push rod stroke online rapid adjustment method described in the first embodiment to adjust the stroke of the electric push rod. The electric push rod includes a housing 1, a sleeve 3, a transmission assembly 4, a telescopic tube assembly 5, a switch assembly 6, a detection assembly 7 and a fine adjustment assembly 8; The transmission assembly 4 includes a screw rod 42; The telescopic tube assembly 5 includes a telescopic tube 52; The detection assembly 7 includes: an inner gear ring 71, a multi-stage reduction gear 72, an upper adjustment disk 73 and a lower adjustment disk 74; the input end of the multi-stage reduction gear 72 is meshed with the screw rod 42 for transmission, and the output end thereof is meshed with the first inner tooth 712 of the inner gear ring 71 for transmission, and the inner gear ring 71 drives the upper adjustment disk 73 and the lower adjustment disk 74 to rotate synchronously in turn; The upper adjusting plate 73 is provided with a first outer tooth 736 , and one side of the upper adjusting plate 73 is provided with a first sensing block 738 for sensing with the limit switch 64 . The inner diameter surface of the lower adjusting plate 74 is provided with a second inner tooth 745, and the inner diameter of one end thereof is provided with a second sensing block 747 for sensing with the limit switch 64; A first friction plate 77 is provided between the inner gear ring 71 and the upper adjustment plate 73; A second friction plate 78 is provided between the upper adjustment plate 73 and the lower adjustment plate 74; The friction coefficient of the second friction plate 78 is smaller than the friction coefficient of the first friction plate 77 .

[0035] As an improvement, the fine adjustment assembly 8 includes a first adjustment rod 81 for adjusting the travel of the telescopic tube 52 and a second adjustment rod 82 for adjusting the minimum installation distance of the telescopic tube 52 .

[0036] As an improvement, a first adjusting gear 811 is provided at the end of the first adjusting rod 81; the first adjusting gear 811 is meshed with the second inner teeth 745 for transmission; and a first adjusting knob 812 is also provided on the first adjusting rod 81; A second adjusting gear 821 is disposed at the end of the second adjusting rod 82 ; the second adjusting gear 821 is meshed with the first outer teeth 736 for transmission; and a second adjusting knob 822 is also disposed on the second adjusting rod 82 .

[0037] Embodiment 3 like Figure 2-Figure 16 , wherein the components identical or corresponding to those in the second embodiment are marked with the corresponding reference numerals in the second embodiment, and for the sake of simplicity, only the differences from the second embodiment are described below. The difference between the third embodiment and the second embodiment is that: An electric push rod, comprising: A housing 1, wherein a motor assembly 2 is disposed in the housing 1, wherein the motor assembly 2 comprises a reduction motor 21 and a mounting frame 22 connected to the reduction motor 21; A sleeve 3, wherein the sleeve 3 is threadedly connected to one end of the housing 1; A transmission assembly 4, wherein the transmission assembly 4 is transmission-connected to the motor assembly 2; A telescopic tube assembly 5, wherein the telescopic tube assembly 5 is transmission-connected to an output end of the transmission assembly 4; The transmission assembly 4 comprises: A bearing seat 41, wherein the bearing seat 41 is connected to the motor assembly 2; specifically, the bearing seat 41 is connected to the mounting frame 22; A screw rod 42, one end of which is transmission-connected to the reduction motor 21; the screw rod 42 is rotatably arranged in the bearing seat 41; specifically, a threaded sleeve is threadedly connected to the screw rod 42, and a bearing is arranged between the outer diameter surface of the threaded sleeve and the inner wall of the bearing seat 41 to support the screw rod 42 to rotate stably. At the same time, the threaded sleeve can prevent the screw rod 42 from being worn and improve the service life of the screw rod 42; and an anti-dropout assembly 43, which is arranged at the other end of the screw rod 42 and is used to prevent the transmission nut 51 from falling off; the anti-dropout assembly 43 includes an anti-dropout gasket 431 and an anti-dropout nut 432, and the anti-dropout nut 432 is threadedly connected to the end of the screw rod 42 to fix the anti-dropout gasket 431 to the end of the screw rod 42; The telescopic tube assembly 5 comprises: A transmission nut 51, wherein the transmission nut 51 is in transmission connection with the transmission assembly 4; specifically, the transmission nut 51 is in threaded transmission connection with the screw rod 42; A telescopic tube 52, one end of which is threadedly connected to one end of the driving nut 51, and the other end of which extends out of one end of the sleeve 3; A transmission guide sleeve 53, wherein the transmission guide sleeve 53 is fixedly connected to the transmission nut 51; the outer diameter surface of the transmission guide sleeve 53 is slidably and guidely connected to the inner wall of the telescopic tube 52; specifically, the outer diameter surface of the transmission guide sleeve 53 is provided with a plurality of guide protrusions, and the inner wall of the sleeve 3 is provided with a guide groove, and the transmission guide sleeve 53 reciprocates along the guide groove; and a guide assembly 54, wherein the guide assembly 54 is disposed at one end of the telescopic tube assembly 5 and guides the telescopic tube assembly 5 to reciprocate; The guide assembly 54 includes a positioning member 541, a guiding member 542 provided on the inner wall of the positioning member 541 for contacting and guiding the telescopic tube assembly 5, and a sealing assembly for sealing the telescopic tube assembly 5; the outer diameter surface of the positioning member 541 is threadedly connected to the end of the sleeve 3, and the connection is bonded with a waterproof sealant, and a sealing ring is also provided between the positioning member 541 and the sleeve 3; the sealing assembly includes a plurality of sealing rings, which can be selectively arranged from the inside to the outside in sequence as O-rings, step seals, and dustproof rings, etc., of course, not limited to the above order combination, and the corresponding sealing ring combination is selected according to different waterproof and dustproof levels; It also includes: a switch assembly 6, which is arranged on one side of the transmission assembly 4 and is used to quickly adjust and limit the stroke of the telescopic tube assembly 5; A detection assembly 7, wherein the detection assembly 7 transmits the rotation stroke of the screw rod 42 to the limit switch 64; and a fine adjustment component 8, the fine adjustment component 8 is used to quickly adjust the position of the detection component 7 relative to the limit switch 64; The switch assembly 6 includes: a lower switch seat 61, an upper switch seat 62, and a switch mounting plate 63 disposed between the lower switch seat 61 and the upper switch seat 62; The lower switch seat 61, the switch mounting plate 63, and the upper switch seat 62 are connected to the bearing seat 41 in sequence through fasteners; The switch mounting plate 63 is provided with a limit switch 64 for limiting the travel of the telescopic tube 52, and the control panel of the limit switch 64 protrudes from the upper switch seat. It should be noted that there are two limit switches 64, one for limiting the shortest travel of the telescopic tube 52, i.e., the minimum installation distance, and the other for limiting the maximum travel of the telescopic tube 52. The lower switch seat 61 is firmly connected to the bearing seat 41; As an improvement, the detection component 7 includes: an inner ring gear 71, a multi-stage reduction gear 72, an upper adjustment disk 73 and a lower adjustment disk 74; the input end of the multi-stage reduction gear 72 is meshed with the screw rod 42 for transmission, and the output end is meshed with the first inner tooth 712 of the inner ring gear 71 for transmission, and the inner ring gear 71 drives the upper adjustment disk 73 and the lower adjustment disk 74 to rotate synchronously in turn, and the upper adjustment disk 73 and the lower adjustment disk 74 are used to control the on and off of the limit switch 64.

[0038] Preferably, the inner diameter surface of one end of the inner gear ring 71 is provided with a first inner diameter surface 711, and the first inner diameter surface 711 is provided with a first inner tooth 712; the outer diameter surface of the inner gear ring 71 is provided with a first outer diameter surface 713; The multi-stage reduction gear 72 is a multi-stage gear that meshes with each other to achieve deceleration and is arranged on the upper switch seat 62; specifically, a large gear on the outermost side of the multi-stage reduction gear 72 meshes with the external teeth arranged on the screw rod 42 for transmission, and the large gear on the other side meshes with the first internal teeth 712; the rotation distance of the screw rod 42 is transmitted to the inner gear ring 71 through the multi-stage reduction gear 72; it should be noted that two support shafts 621 are arranged on the upper switch seat 62, and a plurality of large gears and small gears are alternately arranged on the same support shaft 621; a group of large gears and small gears opposite to the two support shafts 621 mesh with each other to achieve deceleration; As an improvement, the inner diameter surface of the upper adjusting disk 73 is provided with a second inner diameter surface 731, and the second inner diameter surface 731 is sleeved with the first outer diameter surface 713; The second inner diameter surface 731 is provided with a first positioning groove 732 , and the first outer diameter surface 713 is provided with a plurality of first elastic limiting members 733 matched with the first positioning groove 732 ; The outer diameter surface of the upper adjusting plate 73 is provided with a second outer diameter surface 734 and a third outer diameter surface 735 , the third outer diameter surface 735 is provided with first outer teeth 736 , and the second outer diameter surface 734 is provided with a plurality of second elastic stoppers 737 ; A first sensing block 738 for sensing the limit switch 64 is convexly disposed on one side of the upper adjusting disk 73; specifically, the first sensing block 738 is preferably disposed at the inner diameter of the upper adjusting disk 73; The outer diameter surface of the upper adjustment disk 73 is also provided with scale lines for rapid size adjustment, so that the operator can quickly adjust the stroke of the electric push rod.

[0039] Preferably, the lower adjustment disk 74 is disposed between the upper adjustment disk 73 and the upper switch seat 62; the inner diameter surface of the lower adjustment disk 74 is provided with a third inner diameter surface 741 and a fourth inner diameter surface 742; the third inner diameter surface 741 is sleeved with the second outer diameter surface 734; The third inner diameter surface 741 is provided with a second positioning groove 744, and the second elastic limiting member 737 is adapted to the second positioning groove 744; The fourth inner diameter surface 742 is provided with second inner teeth 745; The lower adjusting disk 74 is provided with a second sensing block 747 for sensing with the limit switch 64 ; specifically, the second sensing block 747 is provided at the inner diameter surface of the lower adjusting disk 74 .

[0040] As an improvement, the detection assembly 7 further includes a pressing assembly 75, and the pressing assembly 75 tightly presses the inner gear ring 71, the upper adjustment plate 73, and the lower adjustment plate 74 to one end of the upper switch seat 62; The pressing assembly 75 comprises: A compression sleeve 751, wherein the compression sleeve 751 is threadedly connected to the inner wall of the sleeve 3; the outer diameter surface of the compression sleeve 751 is provided with a pattern for facilitating the screwing of the compression sleeve 751; and an elastic pressing member 752, one end of which abuts against the pressing sleeve 751, and the other end abuts against the inner gear ring 71. Specifically, the elastic pressing member 752 is preferably a compression spring, one end of which abuts against the inner diameter surface step of the pressing sleeve 751, and the other end abuts against the inner gear ring 71. The adjustment of the pressing force is achieved by changing the distance between the pressing sleeve 751 and the inner gear ring.

[0041] A low-friction connector 76 is provided between the lower adjustment disk 74 and the upper switch seat 62 and between the elastic clamping member 752 and the inner gear ring 71; specifically, the connector 76 can be selected from oil-containing bearings, rolling bearings, ultra-thin gaskets, etc., to reduce the friction resistance between the lower adjustment disk 74 and the switch seat.

[0042] Embodiment 4 like Fig. 9 , Figure 13-Figure 16 As shown, the components identical or corresponding to those in the third embodiment are marked with the corresponding reference numerals in the third embodiment. For the sake of simplicity, only the differences from the third embodiment are described below. The fourth embodiment differs from the third embodiment in that: In this embodiment, a first friction plate 77 is provided between one end surface of the inner gear ring 71 and the bottom end surface of the second inner diameter surface 731; the first friction plate 77 is provided with two plates, which are respectively connected to the inner gear ring 71 and the upper adjustment plate 73 through a plurality of cylindrical pins 771 evenly distributed around the circumference; a plurality of elastic members 772 are provided on one end surface of the inner gear ring 71 to abut against the first friction plate 77, so that the two first friction plates 77 are closely fitted to realize friction transmission; preferably, the elastic member 772 is a spring; A second friction plate 78 is provided between the bottom end of the third inner diameter surface 741 and the top end of the second outer diameter surface 734; the second friction plate 78 has two plates, which are respectively connected to the lower adjustment plate 74 and the upper adjustment plate 73 through a plurality of cylindrical pins 771 evenly distributed around the circumference; a plurality of elastic members 772 are evenly distributed around the top end of the second outer diameter surface 734, which are used to fit the two second friction plates 78 tightly together to achieve friction transmission; As an improvement, the friction coefficient of the second friction plate 78 is smaller than the friction coefficient of the first friction plate 77 .

[0043] It should be noted that, during the stroke adjustment process, when the upper adjustment disk 73 is turned alone, the lower adjustment disk 74 rotates synchronously with the upper adjustment disk, and the inner gear ring remains stationary, so that the distance between the upper adjustment disk 73 and the limit switch is adjusted, thereby realizing the rapid adjustment of the minimum installation distance; After adjusting the minimum installation distance, when the lower adjustment disk 74 is turned alone, the upper adjustment disk 73 remains stationary, and the inner gear ring remains stationary, so that the position of the lower adjustment disk relative to the upper adjustment disk 73 and the limit switch is adjusted, thereby realizing rapid adjustment of the travel of the telescopic tube 52.

[0044] As an improvement, the diameter of the second friction plate 78 is smaller than the diameter of the first friction plate 77 .

[0045] Specifically, under the same positive pressure, a larger friction plate diameter will increase its torque limit. When torque is input, the inner ring gear, upper adjustment plate, and lower adjustment plate are treated as a whole and are subject to the same torque. Therefore, the friction plate with a smaller diameter will reach the friction limit first and then be rotated.

[0046] Embodiment 5 like Figure 8 , Fig.11 As shown, the components identical or corresponding to those in the third embodiment are marked with the corresponding reference numerals in the third embodiment. For the sake of simplicity, only the differences from the third embodiment are described below. The fifth embodiment differs from the third embodiment in that: In this embodiment, the fine adjustment assembly 8 includes a first adjustment rod 81 for adjusting the travel of the telescopic tube 52 and a second adjustment rod 82 for adjusting the minimum installation distance of the telescopic tube 52 .

[0047] Further, one end of the second adjusting rod 82 is rotated and slid along the axial direction of the lower switch seat 61 and is arranged on the lower switch seat 61, and the other end passes through the upper switch seat 62 and extends into the lower adjusting disk 74; a second adjusting gear 821 is arranged at the end of the second adjusting rod 82; the second adjusting gear 821 is meshed and transmitted with the first outer tooth 736; a second adjusting knob 822 is also arranged on the second adjusting rod 82; magnetic rings 813 are arranged at both ends of the second adjusting knob 822, and magnetic rings 813 are also arranged at the positions on the lower switch seat 61 and the upper switch seat 62 where the second adjusting rod 82 passes; When it is necessary to precisely adjust the minimum installation distance of the telescopic tube 52, the second adjusting knob 822 is turned to move the second adjusting rod 82 to the right, driving the second adjusting gear 821 and the first outer tooth 736 to engage in transmission, and the second adjusting knob 822 is turned to make the upper adjusting disk 73 and the lower adjusting disk 74 rotate synchronously, so as to adjust the distance of the upper adjusting disk 73 relative to the limit switch, thereby achieving precise adjustment of the minimum installation distance; when no adjustment is required, the second adjusting knob 822 moves to the left and is adsorbed on the lower switch seat 61 by the magnetic ring 813, and at the same time, the second adjusting gear 821 is disengaged.

[0048] As an improvement, one end of the first adjusting rod 81 is rotated and slid along the axial direction of the lower switch seat 61 and is arranged on the lower switch seat 61, and the other end passes through the upper switch seat 62 and extends into the lower adjusting disk 74; a first adjusting gear 811 is arranged at the end of the first adjusting rod 81; the first adjusting gear 811 is meshed and transmitted with the second inner gear 745; a first adjusting knob 812 is also arranged on the first adjusting rod 81; magnetic rings 813 are arranged at both ends of the first adjusting knob 812, and magnetic rings 813 are also arranged at the positions on the lower switch seat 61 and the upper switch seat 62 where the first adjusting rod 81 passes; It should be noted that the upper switch seat 62 is also provided with a receiving cavity for receiving the first adjusting gear 811. When no adjustment is required, the first adjusting knob 812 is close to the lower switch seat 61, so that the magnetic ring 813 on the lower switch seat 61 is attracted to the magnetic ring 813 of the first adjusting knob 812, so that the first adjusting knob 812 is fixed on the lower switch seat 61. At the same time, the first adjusting gear 811 enters the receiving cavity and is disengaged from the second inner tooth 745. When the position of the lower adjusting disk 74 needs to be precisely adjusted, , turn the first adjusting knob 812 to make it close to the upper switch seat 62 and use the magnetic ring 813 to absorb it. At this time, the first adjusting gear 811 is engaged with the second inner tooth 745, and the first adjusting knob 812 is turned to drive the lower adjusting disk 74 to rotate. Since the friction coefficient of the second friction plate 78 is smaller than the friction coefficient of the first friction plate 77, at this time, the upper adjusting disk 73 remains stationary, thereby realizing fine adjustment of the position of the second sensing block 747, thereby realizing precise adjustment of the travel of the telescopic tube 52.

[0049] An adjustment window 31 is also provided on the outer diameter surface of the sleeve 3. A sealing ring is provided at the adjustment window 31 so as to be suitable for working conditions requiring waterproofing. The position of the adjustment window 31 corresponds to the position of the lower switch seat 61. At the same time, the width of the adjustment window 31 is adapted to the width from the lower switch seat 61 to the clamping sleeve 751, so that the adjustment window 31 is opened conveniently and the stroke of the electric push rod can be adjusted quickly. The adjustment window 31 is particularly suitable for electric push rods that need to frequently adjust the stroke of the electric push rods online, so as to solve the technical problems in the prior art that the electric push rods are inconvenient to adjust the stroke online and have a slow adjustment speed.

[0050] In actual applications, users can adjust the minimum installation distance first and then adjust the stroke.

[0051] 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 method for online rapid adjustment of electric push rod stroke, characterized in that: The following steps are involved: Rapid adjustment of the minimum installation distance of the telescopic tube: opening the cover of the adjustment window (31), turning the upper adjustment disk (73), changing the distance between the first sensing block (738) on the upper adjustment disk (73) and the limit switch (64), the telescopic tube (52) of the motor runs to the minimum extension position, and the minimum installation distance of the telescopic tube is detected; Rapid adjustment of the telescopic tube stroke: open the cover of the adjustment window (31), rotate the lower adjustment disk (74), keep the upper adjustment disk (73) stationary, change the relative position of the second sensing block (747) on the lower adjustment disk (74) and the limit switch (64), and move the telescopic tube (52) of the motor to the maximum extension position to detect the maximum travel distance of the telescopic tube.

2. The method for online rapid adjustment of electric push rod stroke according to claim 1, characterized in that: The invention also includes fine adjustment of the minimum installation distance of the telescopic tube, wherein the second adjustment knob (822) is turned to drive the second adjustment rod (82) to move rightward, so that the second adjustment gear (821) and the first outer gear (736) are meshed and transmitted, and the second adjustment knob (822) is turned to change the position of the upper adjustment disk (73) relative to the limit switch (64), thereby completing the fine adjustment of the travel of the telescopic tube (52).

3. The method for online rapid adjustment of electric push rod stroke according to claim 1, characterized in that: The invention also includes fine adjustment of the telescopic tube stroke: turning the first adjustment knob (812) to drive the first adjustment rod (81) to move rightward, so that the first adjustment gear (811) is meshed with the second inner gear (745), and the first adjustment knob (812) is turned to drive the lower adjustment disk (74) to rotate, thereby changing the position of the lower adjustment disk (74) relative to the limit switch (64), thereby completing the fine adjustment of the minimum installation distance.

4. The method for online rapid adjustment of electric push rod stroke according to claim 3, characterized in that: In the telescopic tube stroke fine adjustment step, the friction coefficient of the second friction plate (78) is smaller than the friction coefficient of the first friction plate (77), and when the lower adjustment plate (74) is turned, the upper adjustment plate (73) remains stationary.

5. The method for online rapid adjustment of electric push rod stroke according to claim 2, characterized in that: In the minimum installation distance fine adjustment step, the friction coefficient of the second friction plate (78) is smaller than the friction coefficient of the first friction plate (77), and during the rotation of the upper adjustment plate (73), the lower adjustment plate (74) rotates synchronously with the upper adjustment plate (73).

6. The method for online rapid adjustment of electric push rod stroke according to claim 1, characterized in that: In the step of quickly adjusting the minimum installation distance of the telescopic tube, during the process of turning the upper adjustment disk (73), the lower adjustment disk (74) is pressed to ensure that the lower adjustment disk (74) does not move.

7. The method for online rapid adjustment of electric push rod stroke according to claim 1, characterized in that: Scale lines for visually adjusting the distance are provided on the outer sides of the upper adjustment disk (73) and the lower adjustment disk (74).

8. An electric push rod, characterized in that: The stroke of the electric push rod is adjusted by using the method for online rapid adjustment of the stroke of the electric push rod as described in any one of claims 1 to 7, the electric push rod comprising a housing (1), a sleeve (3), a transmission assembly (4), a telescopic tube assembly (5), a switch assembly (6), a detection assembly (7) and a fine adjustment assembly (8); The transmission assembly (4) comprises a screw rod (42); The telescopic tube assembly (5) comprises a telescopic tube (52); The detection assembly (7) comprises: an inner gear ring (71), a multi-stage reduction gear (72), an upper adjustment disk (73) and a lower adjustment disk (74); the input end of the multi-stage reduction gear (72) meshes with the lead screw (42) for transmission, and the output end of the multi-stage reduction gear (72) meshes with the first inner tooth (712) of the inner gear ring (71) for transmission, and the inner gear ring (71) sequentially drives the upper adjustment disk (73) and the lower adjustment disk (74) to rotate synchronously; The upper adjustment disk (73) is provided with a first external tooth (736), and one side of the upper adjustment disk (73) is provided with a first sensing block (738) for sensing with a limit switch (64). The inner diameter surface of the lower adjustment disk (74) is provided with second inner teeth (745), and the inner diameter of one end thereof is provided with a second sensing block (747) for sensing with a limit switch (64); A first friction plate (77) is provided between the inner gear ring (71) and the upper adjustment plate (73); A second friction plate (78) is provided between the upper adjustment plate (73) and the lower adjustment plate (74); The friction coefficient of the second friction plate (78) is smaller than the friction coefficient of the first friction plate (77).

9. The electric linear actuator according to claim 8, characterized in that: The fine adjustment assembly (8) comprises a first adjustment rod (81) for adjusting the travel of the telescopic tube (52) and a second adjustment rod (82) for adjusting the minimum installation distance of the telescopic tube (52).

10. The electric linear actuator according to claim 9, characterized in that: A first adjusting gear (811) is provided at the end of the first adjusting rod (81); the first adjusting gear (811) is meshed with the second inner teeth (745) for transmission; and a first adjusting knob (812) is also provided on the first adjusting rod (81); A second adjusting gear (821) is provided at the end of the second adjusting rod (82); the second adjusting gear (821) is meshed with the first external teeth (736) for transmission; and a second adjusting knob (822) is also provided on the second adjusting rod (82).

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