An electric push rod with quick adjustment of travel switch

Abstract

The present invention provides an electric push rod with quick adjustment of travel switch, comprising: a housing, a motor assembly, a sleeve, a transmission assembly, and a telescopic tube assembly. The transmission assembly includes: a bearing seat and a lead screw. The telescopic tube assembly includes: a transmission nut and a telescopic tube. It further includes: a switch assembly, which is arranged on one side of the transmission assembly and is used to quickly adjust and limit the travel of the telescopic tube assembly; a detection assembly, which transmits the rotation travel of the lead screw to a limit switch; a fine adjustment assembly, which is used to quickly adjust the position of the detection assembly relative to the limit switch. By providing an adjustable opening window on the electric push rod, the detection assembly cooperates with the fine adjustment assembly to achieve online quick adjustment of the travel and minimum installation distance of the push rod, solving the technical problems in the prior art that the adjustment speed of the travel and minimum installation distance of the electric push rod is slow and it is not convenient for online adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and particularly to an electric push rod with quick adjustment of travel switches. Background Art

[0002] An electric push rod uses an electric motor as power, drives a screw nut through gear reduction, converts the rotational motion of the electric motor into a linear motion of the push rod along the guide rail, and uses the forward and reverse rotation of the electric motor to realize the reciprocating forward and backward movement of the push rod. The electric push rod needs to be provided with a limit detection mechanism to limit the minimum installation distance and the maximum stroke of the electric push rod.

[0003] Chinese Patent CN217789506U discloses a travel switch structure for an electric push rod, which includes a motor, a lead screw, a nut, a mounting seat, a slider, a rod member, a limit block, an elastic member, and a travel switch. The nut is arranged on the lead screw. The slider is installed on the mounting seat and moves along the length direction of the lead screw on the mounting seat. The rod member is fixedly connected to the slider and passes through the nut. The limit block is movably connected to the rod member. The elastic member resets the slider. The travel switch is controllably connected to the motor. In the present utility model, only by adjusting the position of the limit block on the rod member, without adjusting the position of the travel switch, the limit position of the nut movement can be adjusted. There is a sufficient distance between the rod member and the lead screw. At the same time, the volume of the limit block is small, and it is convenient to adjust the limit position of the nut movement.

[0004] However, this technical solution adopts the method of manually rotating the first limit block and the second limit block to change the minimum installation distance and the stroke. Adjusting through fine-threaded screws is not only slow but also not convenient for on-line adjustment. Only when assembling the electric push rod, the stroke and the minimum installation distance can be adjusted. If subsequent users need to adjust, they need to disassemble the electric push rod for adjustment. Since sealant is provided at the threaded connection of the electric push rod, it cannot be fully guaranteed to be sealed after being opened for the second time, which affects the normal use of the electric push rod. Summary of the Invention

[0005] The purpose of the present invention is to provide an electric push rod with quick adjustment of travel switches for the deficiencies of the prior art. By providing an adjustable opening window on the electric push rod, on-line adjustment of the stroke and the minimum installation distance of the push rod can be realized. The detection component is used to control the stroke and the minimum installation distance of the telescopic tube. At the same time, the detection component can quickly and roughly adjust the stroke and the minimum installation distance of the telescopic tube, solving the technical problems in the prior art that the adjustment speed of the stroke and the minimum installation distance of the electric push rod is slow and it is not convenient for on-line adjustment. Further, the fine adjustment component is used to accurately adjust the stroke and the minimum installation distance of the telescopic tube, solving the problem of inaccurate adjustment position in manual rough adjustment.

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

[0007] An electric push rod with quick adjustment of travel switch, comprising:

[0008] A housing, in which a motor assembly is provided; the motor assembly includes a reduction motor;

[0009] A sleeve, which is connected to one end of the housing;

[0010] A transmission assembly, which is in transmission connection with the motor assembly;

[0011] A telescopic tube assembly, which is in transmission connection with the output end of the transmission assembly;

[0012] The transmission assembly includes:

[0013] A bearing seat, which is connected to the motor assembly;

[0014] A lead screw, one end of which is in transmission connection with the reduction motor; the lead screw is rotatably arranged in the bearing seat;

[0015] The telescopic tube assembly includes:

[0016] A transmission nut, which is in transmission connection with the transmission assembly; specifically, the transmission nut is in threaded transmission connection with the lead screw;

[0017] A telescopic tube, one end of which is in threaded connection with one end of the transmission nut, and the other end extends out of one end of the sleeve;

[0018] It further includes:

[0019] A switch assembly, which is arranged on one side of the transmission assembly for quickly adjusting and limiting the travel of the telescopic tube assembly;

[0020] A detection assembly, which transmits the rotation travel of the lead screw to the limit switch;

[0021] A fine adjustment assembly, which is used for quickly adjusting the position of the detection assembly relative to the limit switch;

[0022] The switch assembly includes: a lower switch seat, an upper switch seat, and a switch mounting plate arranged between the lower switch seat and the upper switch seat;

[0023] A limit switch for restricting the travel of the telescopic tube is installed on the switch mounting plate.

[0024] As an improvement, the detection component includes: an internal gear ring, a multi-stage reduction gear, an upper adjusting disk, and a lower adjusting disk; the input end of the multi-stage reduction gear is in meshing transmission with the lead screw, and its output end is in meshing transmission with the first internal teeth of the internal gear ring. The internal gear ring drives the upper adjusting disk and the lower adjusting disk to rotate synchronously in sequence, and the upper adjusting disk and the lower adjusting disk are used to control the on-off of the limit switch.

[0025] As an improvement, one end inner diameter surface of the internal gear ring is provided with a first inner diameter surface, and the first inner teeth are provided on the first inner diameter surface; the outer diameter surface of the internal gear ring is provided with a first outer diameter surface;

[0026] The multi-stage reduction gear, which is used to realize the rotation of multiple meshing gears for deceleration, is arranged on the upper switch seat.

[0027] As an improvement, the inner diameter surface of the upper adjusting disk is provided with a second inner diameter surface, and the second inner diameter surface is sleeved with the first outer diameter surface;

[0028] The second inner diameter surface is provided with a first positioning groove, and several first elastic limiting parts matched with the first positioning groove are provided on the first outer diameter surface;

[0029] The outer diameter surface of the upper adjusting disk is provided with a second outer diameter surface and a third outer diameter surface. The first external teeth are provided on the third outer diameter surface, and several second elastic limiting parts are provided on the second outer diameter surface;

[0030] One side of the upper adjusting disk is convexly provided with a first induction block for inducing with the limit switch.

[0031] As an improvement, the lower adjusting disk is arranged between the upper adjusting disk and the upper switch seat; the inner diameter surface of the lower adjusting disk is provided with a third inner diameter surface and a fourth inner diameter surface; the third inner diameter surface is sleeved with the second outer diameter surface;

[0032] The third inner diameter surface is provided with a second positioning groove, and the second elastic limiting part is adapted to the second positioning groove;

[0033] The fourth inner diameter surface is provided with second internal teeth;

[0034] The lower adjusting disk is provided with a second induction block for inducing with the limit switch.

[0035] As an improvement, a first friction plate is arranged between one end end surface of the internal gear ring and the bottom end surface of the second inner diameter surface; several elastic parts abutted against the first friction plate are arranged on one end end surface of the internal gear ring; there are two first friction plates, which are respectively connected with the internal gear ring and the upper adjusting disk through several circumferentially evenly distributed cylindrical pins;

[0036] A second friction plate is provided between the bottom end of the third inner diameter surface and the top end of the second outer diameter surface; there are two second friction plates, which are respectively connected to the lower adjusting disc and the upper adjusting disc by a number of circumferentially distributed cylindrical pins;

[0037] The friction coefficient of the second friction plate is greater than that of the first friction plate.

[0038] As an improvement, the detection assembly further includes a pressing assembly, and the pressing assembly tightly presses the internal gear ring, the upper adjusting disc, and the lower adjusting disc against one end of the upper switch base;

[0039] The pressing assembly includes:

[0040] A pressing sleeve, which is threadedly connected to the inner wall of the sleeve;

[0041] And an elastic pressing member, one end of the elastic pressing member abuts against the pressing sleeve, and the other end abuts against the internal gear ring. Specifically, the elastic pressing member is preferably a compression spring, one end of the compression spring abuts against the inner diameter surface step of the pressing sleeve, and the other end abuts against the internal gear ring.

[0042] As an improvement, the fine adjustment assembly includes a first adjusting rod for adjusting the stroke of the telescopic tube and a second adjusting rod for adjusting the minimum installation distance of the telescopic tube.

[0043] As an improvement, one end of the first adjusting rod rotates and axially slides along the lower switch base and is arranged on the lower switch base, and the other end passes through the upper switch base and extends into the lower adjusting disc; a first adjusting gear is provided at the end of the first adjusting rod; the first adjusting gear meshes and drives with the second internal teeth; a first adjusting knob is also provided on the first adjusting rod.

[0044] As an improvement, one end of the second adjusting rod rotates and axially slides along the lower switch base and is arranged on the lower switch base, and the other end passes through the upper switch base and extends into the lower adjusting disc; a second adjusting gear is provided at the end of the second adjusting rod; the second adjusting gear meshes and drives with the first external teeth; a second adjusting knob is also provided on the second adjusting rod.

[0045] The beneficial effects of the present invention are as follows:

[0046] (1) Through the setting of the detection assembly, the present invention realizes controlling the stroke and the minimum installation distance of the telescopic tube through the detection assembly. At the same time, the detection assembly can quickly and roughly adjust the stroke and the minimum installation distance of the telescopic tube, solving the technical problems in the prior art that the adjustment speed of the stroke and the minimum installation distance of the electric push rod is slow and it is not convenient to adjust online. At the same time, by using the fine adjustment assembly, the stroke and the minimum installation distance of the telescopic tube are accurately adjusted in the way of driving a large gear to rotate by a small gear and cooperating with the scale line on the adjusting disc, solving the problem of inaccurate position adjustment in manual rough adjustment.

[0047] (2) The present invention converts the distance of the rotation of the lead screw into the rotation distance of the upper adjusting disc and the lower adjusting disc through a multi-stage reduction gear, so as to realize the minimum installation distance and the detection of the stroke position. The detection mechanism is built inside the electric push rod, improving the applicable range of the electric push rod, especially in occasions with high waterproof requirements.

[0048] (3) The present invention realizes the connection of the adjacent internal gear ring and the upper adjusting disc into an integral structure through the setting of the first elastic limiting member and the first positioning groove, realizing synchronous rotation. With the setting of the first friction plate between the two, it further ensures that the two can rotate synchronously.

[0049] (4) The present invention tightly presses the internal gear ring, the upper adjusting disc and the lower adjusting disc through the pressing component, ensuring the synchronous rotation of the three during the normal operation of the electric push rod, and realizing the stroke detection of the electric push rod.

[0050] (5) The present invention reduces the frictional force between the lower adjusting disc and the upper switch seat and between the elastic pressing member and the internal gear ring by setting the connecting member, ensuring the stable and synchronous rotation of the upper adjusting disc, the lower adjusting disc and the internal gear ring, and improving the stroke detection accuracy.

[0051] (6) The present invention is provided with an adjustable opening window on the electric push rod, facilitating the quick on-line adjustment of the stroke of the electric push rod, improving the applicable range of the electric push rod, especially for working conditions that require frequent adjustment of the stroke.

[0052] (7) The present invention can realize stepless adjustment throughout the stroke. Through the selection of the sealing member, the sealing and waterproof level of the electric push rod can reach IP68 or higher, and it is applicable to more working conditions.

[0053] In summary, the present invention has the advantages of being able to adjust the stroke of the push rod on-line, having the minimum installation distance, fast adjustment speed, wide applicable range, etc. Brief Description of the Drawings

[0054] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0055] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0056] Figure 3 It is a schematic diagram of the installation of the switch assembly and the detection assembly of the present invention;

[0057] Figure 4 It is a schematic diagram of the internal gear ring structure of the present invention;

[0058] Figure 5 It is a schematic diagram of the upper adjusting disc of the present invention;

[0059] Figure 6Schematic cross-sectional view of the lower adjusting disc of the present invention;

[0060] Figure 7 Schematic installation view of the fine adjustment component of the present invention;

[0061] Figure 8 Schematic cross-sectional view of the detection component of the present invention;

[0062] Figure 9 Schematic view of the installation of the first elastic limiting member on the internal gear ring of the present invention;

[0063] Figure 10 Schematic enlarged view of a part of the fine adjustment component of the present invention;

[0064] Figure 11 For Figure 2 Partial enlarged view at position A in

[0065] Figure 12 For Figure 8 Partial enlarged view at position B in

[0066] Figure 13 For Figure 8 Partial enlarged view at position C in

[0067] Figure 14 For Figure 8 Partial enlarged view at position D in

[0068] Figure 15 For Figure 8 Partial enlarged view at position E in Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present 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. Therefore, it should not be construed as a limitation to 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0071] Embodiment 1

[0072] As Figures 1 - 15 shown, this embodiment provides an electric push rod with quick adjustment of travel switch, including:

[0073] A housing 1, in which a motor assembly 2 is provided. The motor assembly 2 includes a reduction motor 21 and a mounting bracket 22 connected to the reduction motor 21;

[0074] A sleeve 3, which is threadedly connected to one end of the housing 1;

[0075] A transmission assembly 4, which is in transmission connection with the motor assembly 2;

[0076] A telescopic tube assembly 5, which is in transmission connection with the output end of the transmission assembly 4;

[0077] The transmission assembly 4 includes:

[0078] A bearing seat 41, which is connected to the motor assembly 2; specifically, the bearing seat 41 is connected to the mounting bracket 22;

[0079] A lead screw 42, one end of which is in transmission connection with the reduction motor 21; the lead screw 42 is rotatably arranged in the bearing seat 41; specifically, a threaded shaft sleeve is threadedly connected to the lead screw 42, and a bearing is provided between the outer diameter surface of the threaded shaft sleeve and the inner wall of the bearing seat 41 to support the stable rotation of the lead screw 42. At the same time, the threaded shaft sleeve can prevent the lead screw 42 from being worn and improve the service life of the lead screw 42;

[0080] and an anti - detachment component 43 which is arranged at the other end of the lead screw 42 and used to prevent the transmission nut 51 from detaching; the anti - detachment component 43 includes an anti - detachment gasket 431 and an anti - detachment nut 432. The anti - detachment nut 432 is threadedly connected to the end of the lead screw 42 to fix the anti - detachment gasket 431 to the end of the lead screw 42;

[0081] The telescopic tube assembly 5 includes:

[0082] A transmission nut 51 which is in transmission connection with the transmission component 4; specifically, the transmission nut 51 is in threaded transmission connection with the lead screw 42;

[0083] A telescopic tube 52, one end of the telescopic tube 52 is threadedly connected to one end of the transmission nut 51, and the other end extends out of one end of the sleeve 3;

[0084] A transmission guide sleeve 53 which is fixedly connected to the transmission nut 51; the outer diameter surface of the transmission guide sleeve 53 is in sliding and guiding connection with the inner wall of the telescopic tube 52; specifically, a number of guiding protrusions are provided on the outer diameter surface of the transmission guide sleeve 53, and guiding grooves are provided on the inner wall of the sleeve 3, and the transmission guide sleeve 53 reciprocates along the guiding grooves;

[0085] And a guiding component 54 which is arranged at one end of the telescopic tube assembly 5 to guide the telescopic tube assembly 5 to reciprocate;

[0086] The guiding component 54 includes a positioning member 541, a guiding member 542 arranged on the inner wall of the positioning member 541 and in contact and guiding with the telescopic tube assembly 5, and a sealing component 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 at the same time, a waterproof sealant is used for bonding at the connection. A sealing ring is also provided between the positioning member 541 and the sleeve 3; the sealing component includes multiple groups of sealing rings. The multiple groups of sealing rings can be sequentially arranged from the inside to the outside as O - rings, Struthers seals, dust seals, etc. Of course, it is not limited to the above - mentioned sequence combination, and the corresponding sealing ring combination is selected according to different waterproof and dust - proof grades;

[0087] It also includes: a switch component 6 which is arranged on one side of the transmission component 4 and used to quickly adjust and limit the stroke of the telescopic tube assembly 5;

[0088] A detection component 7 which transmits the rotation stroke of the lead screw 42 to the limit switch 64;

[0089] And a fine - tuning component 8 which is used to quickly adjust the position of the detection component 7 relative to the limit switch 64;

[0090] The switch assembly 6 includes: a lower switch base 61, an upper switch base 62, and a switch mounting plate 63 disposed between the lower switch base 61 and the upper switch base 62;

[0091] The lower switch base 61, the switch mounting plate 63, and the upper switch base 62 are sequentially connected to the bearing seat 41 through fasteners;

[0092] A limit switch 64 for restricting the stroke of the telescopic tube 52 is mounted on the switch mounting plate 63, and the control board of the limit switch 64 protrudes from the upper switch base; it should be noted that there are two limit switches 64, one for restricting the shortest stroke of the telescopic tube 52, that is, the minimum installation distance, and the other for restricting the maximum stroke of the telescopic tube 52;

[0093] The lower switch base 61 is fixedly connected to the bearing seat 41;

[0094] As an improvement, the detection assembly 7 includes: an internal 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 in meshing transmission with the lead screw 42, and its output end is in meshing transmission with the first internal teeth 712 of the internal gear ring 71. The internal gear ring 71 drives the upper adjustment disk 73 and the lower adjustment disk 74 to rotate synchronously in sequence, and the upper adjustment disk 73 and the lower adjustment disk 74 are used to control the on-off of the limit switch 64.

[0095] Preferably, one end inner diameter surface of the internal gear ring 71 is provided with a first inner diameter surface 711, and the first inner teeth 712 are provided on the first inner diameter surface 711; the outer diameter surface of the internal gear ring 71 is provided with a first outer diameter surface 713;

[0096] The multi-stage reduction gear 72, which is a set of gears in multi-stage meshing for achieving speed reduction, is disposed on the upper switch base 62; specifically, the outermost large gear of the multi-stage reduction gear 72 is in meshing transmission with the external teeth provided on the lead screw 42, and the large gear on the other side is in meshing with the first internal teeth 712; the distance of the rotation of the lead screw 42 is transmitted to the internal gear ring 71 through the multi-stage reduction gear 72; it should be noted that two support shafts 621 are provided on the upper switch base 62, and a number of large gears and small gears are alternately provided on the same support shaft 621; a set of large gears and small gears on the two opposite support shafts 621 are meshed with each other to achieve speed reduction;

[0097] As an improvement, the inner diameter surface of the upper adjustment 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;

[0098] The second inner diameter surface 731 is provided with a first positioning groove 732, and a number of first elastic limit members 733 cooperating with the first positioning groove 732 are provided on the first outer diameter surface 713;

[0099] 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 ;

[0100] 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;

[0101] 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.

[0102] 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;

[0103] 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;

[0104] The fourth inner diameter surface 742 is provided with second inner teeth 745;

[0105] 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 .

[0106] 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;

[0107] The pressing assembly 75 comprises:

[0108] 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;

[0109] 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.

[0110] A low-friction connecting member 76 is provided between the lower adjusting disc 74 and the upper switch base 62, and between the elastic pressing member 752 and the internal gear ring 71. Specifically, the connecting member 76 can be an oil-impregnated bearing, a rolling bearing, an ultra-thin gasket, etc., to reduce the frictional resistance between the lower adjusting disc 74 and the switch base.

[0111] Embodiment 2

[0112] As Figure 8 、 Figures 12 - 15 shown, where the same or corresponding components as those in Embodiment 1 are labeled with the corresponding reference numerals in the drawings of Embodiment 1. For simplicity, only the differences from Embodiment 1 will be described below. The differences between this Embodiment 2 and Embodiment 1 are as follows:

[0113] In this embodiment, a first friction plate 77 is provided between one end face of the internal gear ring 71 and the bottom end face of the second inner diameter surface 731. There are two first friction plates 77, which are respectively connected to the internal gear ring 71 and the upper adjusting disc 73 through a number of circumferentially evenly distributed cylindrical pins 771. A number of elastic members 772 are provided on one end face of the internal gear ring 71 to abut against the first friction plate 77, so that the two first friction plates 77 are closely attached to achieve frictional transmission. Preferably, the elastic member 772 is a spring.

[0114] 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. There are two second friction plates 78, which are respectively connected to the lower adjusting disc 74 and the upper adjusting disc 73 through a number of circumferentially evenly distributed cylindrical pins 771. A number of elastic members 772 are circumferentially evenly distributed at the top end of the second outer diameter surface 734 for closely attaching the two second friction plates 78 to achieve frictional transmission.

[0115] As an improvement, the friction coefficient of the second friction plate 78 is less than that of the first friction plate 77.

[0116] It should be noted that during the process of realizing stroke adjustment, when the upper adjusting disc 73 is toggled alone, the lower adjusting disc 74 rotates synchronously with the upper adjusting disc, and the internal gear ring remains stationary, realizing the adjustment of the distance between the upper adjusting disc 73 and the limit switch, so as to realize the rapid adjustment of the minimum installation distance.

[0117] After adjusting the minimum installation distance, when the lower adjusting disc 74 is toggled alone, the upper adjusting disc 73 remains stationary and the internal gear ring remains stationary, realizing the position adjustment of the lower adjusting disc relative to the upper adjusting disc 73 and the limit switch, so as to realize the rapid adjustment of the stroke of the telescopic tube 52.

[0118] As an improvement, the diameter of the second friction plate 78 is less than that of the first friction plate 77.

[0119] Specifically, under the same normal pressure, a larger friction plate diameter will increase its torque upper limit. When inputting torque, the inner gear ring, the upper adjusting disc, and the lower adjusting disc are regarded as a whole, and the torque they receive is the same. Therefore, the friction plate with a smaller diameter will reach the friction upper limit first and then be rotated.

[0120] Embodiment Three

[0121] As Figure 7 、 Figure 10 shown, where the same or corresponding components as those in Embodiment One adopt the corresponding reference numerals in the drawings of Embodiment One. For the sake of simplicity, only the differences from Embodiment One will be described below. The differences between this Embodiment Two and Embodiment One are as follows:

[0122] In this embodiment, the fine-tuning assembly 8 includes a first adjusting rod 81 for adjusting the stroke of the telescopic tube 52 and a second adjusting rod 82 for adjusting the minimum installation distance of the telescopic tube 52.

[0123] Further, one end of the second adjusting rod 82 is rotatably and axially slidably disposed on the lower switch base 61 along the lower switch base 61, and the other end passes through the upper switch base 62 and extends into the inner part of the lower adjusting disc 74; a second adjusting gear 821 is provided at the end of the second adjusting rod 82; the second adjusting gear 821 is in meshing transmission with the first external teeth 736; a second adjusting knob 822 is further provided on the second adjusting rod 82; magnetic rings 813 are provided at both ends of the second adjusting knob 822, and magnetic rings 813 are also provided at the positions on the lower switch base 61 and the upper switch base 62 through which the second adjusting rod 82 passes;

[0124] When it is necessary to accurately adjust the minimum installation distance of the telescopic tube 52, the second adjusting knob 822 is toggled to move the second adjusting rod 82 to the right, driving the second adjusting gear 821 and the first external teeth 736 to be in meshing transmission. The second adjusting knob 822 is rotated to synchronously rotate the upper adjusting disc 73 and the lower adjusting disc 74, realizing the adjustment of the distance between the upper adjusting disc 73 and the limit switch, so as to realize the accurate adjustment of the minimum installation distance; when no adjustment is needed, the second adjusting knob 822 moves to the left and is adsorbed on the lower switch base 61 by the magnetic ring 813. At the same time, the second adjusting gear 821 disengages from the meshing.

[0125] As an improvement, one end of the first adjusting rod 81 is rotatably and axially slidably disposed on the lower switch base 61 along the lower switch base 61, and the other end passes through the upper switch base 62 and extends into the inner part of the lower adjusting disc 74; a first adjusting gear 811 is provided at the end of the first adjusting rod 81; the first adjusting gear 811 is in meshing transmission with the second internal teeth 745; a first adjusting knob 812 is further provided on the first adjusting rod 81; magnetic rings 813 are provided at both ends of the first adjusting knob 812, and magnetic rings 813 are also provided at the positions on the lower switch base 61 and the upper switch base 62 through which the first adjusting rod 81 passes;

[0126] It should be noted that the upper switch base 62 is further provided with a receiving cavity for receiving the first adjusting gear 811. When adjustment is not required, the first adjusting knob 812 is close to the lower switch base 61, so that the magnetic ring 813 on the lower switch base 61 attracts the magnetic ring 813 of the first adjusting knob 812, so that the first adjusting knob 812 is fixed on the lower switch base 61. At the same time, the first adjusting gear 811 enters the receiving cavity and disengages from the second internal teeth 745; when precise adjustment of the position of the lower adjusting disc 74 is required, the first adjusting knob 812 is toggled to make the first adjusting knob 812 close to the upper switch base 62 and adsorbed by the magnetic ring 813. At this time, the first adjusting gear 811 is engaged with the second internal teeth 745. By rotating the first adjusting knob 812, the lower adjusting disc 74 is driven to rotate. Since the friction coefficient of the second friction plate 78 is less than the friction coefficient of the first friction plate 77, at this time, the upper adjusting disc 73 remains stationary, so as to realize precise adjustment of the position of the second sensing block 747, and thus realize precise adjustment of the stroke of the telescopic tube 52.

[0127] An adjustment window 31 is further opened on the outer diameter surface of the sleeve 3. A sealing ring is provided at the adjustment window 31 to be suitable for working conditions that require waterproofing. The position of the adjustment window 31 corresponds to the position of the lower switch base 61. At the same time, the width of the adjustment window 31 is adapted to the width from the lower switch base 61 to the pressing sleeve 751, which is convenient for opening the adjustment window 31 to quickly adjust the stroke of the electric push rod; especially for electric push rods that need to frequently adjust the stroke of the electric push rod online, it is particularly applicable, and solves the technical problems of inconvenient online adjustment of the stroke and slow adjustment speed in the prior art.

[0128] In practical applications, users can first adjust the minimum installation distance and then adjust the stroke.

[0129] Embodiment Four

[0130] This embodiment provides a method for quickly adjusting the stroke of an electric push rod, so that the electric push rod described in the above Embodiments 1 to 3 can realize online and quick adjustment of its stroke and minimum installation distance. The specific operations include the following steps:

[0131] Quick adjustment of the minimum installation distance of the telescopic pipe: Open the cover plate of the adjustment window 31, manually turn the upper adjustment disc 73 to change the distance between the first induction block 738 and the limit switch 64, run the telescopic pipe 52 of the motor to the minimum extended position, detect the minimum installation distance of the telescopic pipe. After the minimum installation distance meets the requirements, complete the adjustment of the minimum installation distance of the telescopic pipe 52; it should be noted that during the process of turning the upper adjustment disc 73, the lower adjustment disc 74 can be pressed to ensure that the lower adjustment disc 74 does not move. Of course, when adjusting the minimum installation distance, the lower adjustment disc can also move synchronously with the upper adjustment disc;

[0132] Quick adjustment of the telescopic pipe stroke: Open the cover plate of the adjustment window 31, rotate the lower adjustment disc 74. At this time, the upper adjustment disc 73 remains stationary, and change the relative position between the second induction block 747 on the lower adjustment disc 74 and the limit switch 64, so as to achieve the quick adjustment of the telescopic pipe stroke;

[0133] Fine adjustment of the minimum installation distance: Turn the second adjustment knob 822 to drive the second adjustment rod 82 to move to the right, so that the second adjustment gear 821 and the first external tooth 736 mesh and drive. Turn the second adjustment knob 822 to change the position of the upper adjustment disc 73 relative to the limit switch 64, and achieve the fine adjustment of the telescopic pipe 52 stroke; during the rotation of the upper adjustment disc 73, the lower adjustment disc 74 rotates synchronously with the upper adjustment disc 73;

[0134] Fine adjustment of the telescopic pipe 52 stroke: Turn the first adjustment knob 812 to drive the first adjustment rod 81 to move to the right, so that the first adjustment gear 811 meshes with the second internal tooth 745. Rotate the first adjustment knob 812 to drive the lower adjustment disc 74 to rotate, and change the position of the lower adjustment disc 74 relative to the limit switch 64, and achieve the fine adjustment of the minimum installation distance;

[0135] In the step of fine adjustment of the telescopic pipe stroke, the friction coefficient of the second friction plate 78 is less than that of the first friction plate 77. When turning the lower adjustment disc 74, the upper adjustment disc 73 remains stationary;

[0136] Preferably, quick and precise adjustment is achieved through the scale lines on the outer sides of the upper adjustment disc and the lower adjustment disc.

[0137] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric push rod for quickly adjusting a travel switch, comprising: A housing (1), wherein a motor assembly (2) is arranged inside the housing (1); A sleeve (3), the sleeve (3) being connected to one end of the shell (1); A transmission assembly (4), the transmission assembly (4) being in transmission connection with the motor assembly (2); and a telescopic tube assembly (5), the telescopic tube assembly (5) being in driving connection with 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); and a screw rod (42), one end of which is drivingly connected to the motor assembly (2); the screw rod (42) is rotatably disposed in the bearing seat (41); The telescopic tube assembly (5) comprises: A transmission nut (51), the transmission nut (51) being transmission-connected to the transmission assembly (4); and a telescopic tube (52), one end of the telescopic tube (52) being threadedly connected to one end of the driving nut (51), and the other end of the telescopic tube (52) extending out of one end of the sleeve (3); It is characterized by further comprising: A switch assembly (6), the switch assembly (6) being arranged on one side of the transmission assembly (4) and being used for quickly adjusting and limiting the travel of the telescopic tube assembly (5); A detection assembly (7), wherein the detection assembly (7) transmits the rotational travel of the screw rod (42) to a limit switch (64); and a fine adjustment component (8), wherein 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) comprises: 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); A limit switch (64) for limiting the travel of the telescopic tube (52) is mounted on the switch mounting plate (63); 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, the inner gear ring (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); An inner diameter surface at one end of the inner gear ring (71) is provided with a first inner diameter surface (711), and a first inner tooth (712) is provided on the first inner diameter surface (711); and an outer diameter surface of the inner gear ring (71) is provided with a first outer diameter surface (713); A multi-stage reduction gear (72), which is used to realize the multi-stage mutually meshing gear rotation of reduction and is arranged on the upper switch seat (62); The inner diameter surface of the upper adjustment 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) that cooperate with the first positioning groove (732); The outer diameter surface of the upper adjustment disk (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 external 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 a limit switch (64) is convexly provided on one side of the upper adjustment plate (73); 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 sheathed 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 fit the second positioning groove (744); The fourth inner diameter surface (742) is provided with second inner teeth (745); The lower adjustment plate (74) is provided with a second sensing block (747) for sensing with the limit switch (64).

2. The electric push rod for rapid adjustment of a travel switch according to claim 1, characterized in that: A first friction plate (77) is provided between an end surface of one end of the inner gear ring (71) and a bottom end surface of the second inner diameter surface (731); a plurality of elastic members (772) abutting against the first friction plate (77) are provided on an end surface of one end of the inner gear ring (71); 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) via a plurality of cylindrical pins (771) evenly distributed around the circumference; 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) is provided with two plates, which are respectively connected to the lower adjustment plate (74) and the upper adjustment plate (73) via a plurality of cylindrical pins (771) evenly distributed around the circumference; The friction coefficient of the second friction plate (78) is greater than the friction coefficient of the first friction plate (77).

3. The electric push rod for rapid adjustment of a travel switch according to claim 1, characterized in that: The detection assembly (7) further comprises a pressing assembly (75), wherein the pressing assembly (75) tightly presses the inner gear ring (71), the upper adjustment disk (73), and the lower adjustment disk (74) onto one end of the upper switch seat (62); The pressing assembly (75) comprises: A compression sleeve (751), the compression sleeve (751) being threadedly connected to the inner wall of the sleeve (3); and an elastic pressing piece (752), one end of the elastic pressing piece (752) abutting against the pressing sleeve (751), and the other end of the elastic pressing piece (752) abutting against the inner gear ring (71).

4. An electric push rod for rapid adjustment of a travel switch according to any one of claims 1 to 3, 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).

5. The electric push rod for rapid adjustment of a travel switch according to claim 4, characterized in that: One end of the first adjusting rod (81) is arranged on the lower switch seat (61) so as to rotate and slide along the axial direction of the lower switch seat (61), and the other end passes through the upper switch seat (62) and extends into the interior of 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 with the second internal gear (745) for transmission; and a first adjusting knob (812) is also arranged on the first adjusting rod (81).

6. The electric push rod for rapid adjustment of a travel switch according to claim 4, characterized in that: One end of the second adjusting rod (82) is arranged on the lower switch seat (61) so as to rotate and slide along the axial direction of the lower switch seat (61), and the other end thereof passes through the upper switch seat (62) and extends into the interior of 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 with the first external gear (736) for transmission; and a second adjusting knob (822) is also arranged on the second adjusting rod (82).

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