Electric push rod capable of rapidly adjusting travel switch

Abstract

The invention provides an electric push rod capable of rapidly adjusting a travel switch, which comprises a shell, a motor assembly, a sleeve, a transmission assembly and a telescopic pipe assembly, and is characterized in that the transmission assembly comprises a bearing seat and a screw rod, and the telescopic pipe assembly comprises a transmission nut and a telescopic pipe; the switch assembly is arranged on one side of the transmission assembly and used for rapidly adjusting and limiting the stroke of the telescopic pipe assembly; the detection assembly transmits the rotation stroke of the lead screw to the position of the limiting switch; the fine adjustment assembly is used for quickly adjusting the position of the detection assembly relative to the limiting switch; the adjustable window which can be opened is arranged on the electric push rod, the detection assembly is matched with the fine adjustment assembly, the stroke and the minimum installation distance of the push rod can be rapidly adjusted on line, and the technical problems that in the prior art, the stroke and the minimum installation distance of the electric push rod are low in adjustment speed and not convenient to adjust on line are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electric push rods, in particular to an electric push rod with a travel switch that can be quickly adjusted. Background Art

[0002] The electric push rod is powered by an electric motor, which drives a lead screw nut through gear reduction, converts the rotational motion of the motor into linear motion of the push rod along the guide rail, and uses the forward and reverse rotation of the motor to achieve the reciprocating forward and backward motion of the push rod. The electric push rod needs to be equipped with a limit detection mechanism to limit the minimum installation distance and maximum stroke of the electric push rod.

[0003] Chinese patent CN217789506U discloses a travel switch structure for an electric push rod, including a motor, a screw, a nut, a mounting seat, a slider, a rod, a limit block, an elastic member and a travel switch, wherein the nut is arranged on the screw. The slider is mounted on the mounting seat and moves along the length direction of the screw on the mounting seat. The rod and the slider are fixedly connected and pass through the nut. The limit block is movably connected to the rod. The elastic member resets the slider, and the travel switch controls the connection motor. The utility model only needs to adjust the position of the limit block on the rod, without adjusting the position of the travel switch, to adjust the limit position of the nut movement. There is a sufficient distance between the rod and the screw, and the limit block is small in size, which is convenient for adjusting the limit position of the nut movement.

[0004] However, this technical solution adopts the method of manually rotating limit block one and limit block two to change the minimum installation distance and stroke. The fine-pitch thread adjustment is not only slow but also inconvenient for online adjustment. The stroke and minimum installation distance can only be adjusted when the electric push rod is assembled. If the user needs to make adjustments later, the electric push rod needs to be disassembled and adjusted. Since the threaded connections of the electric push rod are provided with sealing glue, the sealing cannot be completely guaranteed after the second opening, which affects the normal use of the electric push rod. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide an electric push rod with a travel switch that can be quickly adjusted. An openable adjustment window is set on the electric push rod to achieve online adjustment of the travel and minimum installation distance of the push rod, and a detection component is used to control the travel and minimum installation distance of the telescopic tube. At the same time, the detection component can be used to quickly and roughly adjust the travel and minimum installation distance of the telescopic tube, thereby solving the technical problems in the prior art that the travel and minimum installation distance of the electric push rod are slow to adjust and are not convenient for online adjustment. Furthermore, a fine adjustment component is used to accurately adjust the travel and minimum installation distance of the telescopic tube, thereby solving the problem of inaccurate manual coarse adjustment of the position.

[0006] To achieve the above object, the present invention provides the following technical solutions: An electric push rod for quickly adjusting a travel switch, comprising: A housing, wherein a motor assembly is disposed in the housing; the motor assembly comprises a reduction motor; a sleeve connected to one end of the shell; A transmission assembly, the transmission assembly is transmission-connected to the motor assembly; A telescopic tube assembly, the telescopic tube assembly being transmission-connected to an output end of the transmission assembly; The transmission assembly comprises: A bearing seat connected to the motor assembly; A screw rod, one end of which is transmission-connected to the reduction motor; the screw rod is rotatably arranged in the bearing seat; The telescopic tube assembly comprises: A transmission nut, the transmission nut is in transmission connection with the transmission assembly; specifically, the transmission nut is in transmission connection with the screw thread; A telescopic tube, one end of which is threadedly connected to one end of the transmission nut, and the other end of which extends out of one end of the sleeve; Also includes: A switch assembly, the switch assembly 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 stroke of the screw rod to the limit switch; A fine adjustment component, the fine adjustment component is used to quickly adjust the position of the detection component relative to the limit switch; The switch assembly comprises: a lower switch seat, an upper switch seat and a switch mounting plate arranged between the lower switch seat and the upper switch seat; A limit switch for limiting the travel of the telescopic tube is installed on the switch installation plate.

[0007] As an improvement, the detection component includes: an inner ring gear, a multi-stage reduction gear, an upper adjustment disk and a lower adjustment disk; the input end of the multi-stage reduction gear is meshed with the screw rod for transmission, and the output end is meshed with the first internal tooth of the inner ring gear for transmission, and the inner ring gear drives the upper adjustment disk and the lower adjustment disk to rotate synchronously in turn, and the upper adjustment disk and the lower adjustment disk are used to control the on and off of the limit switch.

[0008] As an improvement, the inner diameter surface of one end of the inner gear ring is provided with a first inner diameter surface, and the first inner diameter surface is provided with a first internal tooth; the outer diameter surface of the inner gear ring is provided with a first outer diameter surface; The multi-stage reduction gear is used to realize the multi-stage mutually meshing gear rotation of reduction and is arranged on the upper switch seat.

[0009] 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; The second inner diameter surface is provided with a first positioning groove, and the first outer diameter surface is provided with a plurality of first elastic limiting members matched with the first positioning groove; The outer diameter surface of the upper adjusting plate is provided with a second outer diameter surface and a third outer diameter surface, the third outer diameter surface is provided with first external teeth, and the second outer diameter surface is provided with a plurality of second elastic limiting members; A first sensing block for sensing with a limit switch is convexly provided on one side of the upper adjusting disk.

[0010] As an improvement, the lower adjustment disk is arranged between the upper adjustment disk and the upper switch seat; the inner diameter surface of the lower adjustment 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; The third inner diameter surface is provided with a second positioning groove, and the second elastic limiting member is adapted to the second positioning groove; The fourth inner diameter surface is provided with second inner teeth; The lower adjusting plate is provided with a second sensing block for sensing with the limit switch.

[0011] As an improvement, a first friction plate is provided between one end surface of the inner gear ring and the bottom end surface of the second inner diameter surface; one end surface of the inner gear ring is provided with a plurality of elastic members abutting against the first friction plate; the first friction plate is provided with two plates, which are respectively connected to the inner gear ring and the upper adjustment plate through a plurality of cylindrical pins evenly distributed around the circumference; 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; the second friction plate is provided with two plates, which are respectively connected to the lower adjustment plate and the upper adjustment plate through a plurality of cylindrical pins evenly distributed around the circumference; The friction coefficient of the second friction plate is greater than the friction coefficient of the first friction plate.

[0012] As an improvement, the detection assembly further includes a pressing assembly, which presses the inner gear ring, the upper adjustment disk, and the lower adjustment disk tightly against one end of the upper switch seat; The clamping assembly comprises: A compression sleeve, the compression sleeve being threadedly connected to the inner wall of the sleeve; And an elastic pressing piece, one end of which abuts against the pressing sleeve, and the other end abuts against the inner gear ring. Specifically, the elastic pressing piece is preferably a compression spring, one end of which abuts against the inner diameter surface step of the pressing sleeve, and the other end abuts against the inner gear ring.

[0013] 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.

[0014] As an improvement, one end of the first adjusting rod rotates and slides along the axial direction of the lower switch seat and is arranged on the lower switch seat, and the other end passes through the upper switch seat and extends into the interior of the lower adjusting disk; a first adjusting gear is provided at the end of the first adjusting rod; the first adjusting gear is meshed with the second internal teeth for transmission; and a first adjusting knob is also provided on the first adjusting rod.

[0015] As an improvement, one end of the second adjusting rod rotates and slides along the axial direction of the lower switch seat and is arranged on the lower switch seat, and the other end passes through the upper switch seat and extends into the interior of the lower adjusting disk; a second adjusting gear is provided at the end of the second adjusting rod; the second adjusting gear meshes with the first external teeth for transmission; and a second adjusting knob is also provided on the second adjusting rod.

[0016] The beneficial effects of the present invention are: (1) 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.

[0017] (2) 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.

[0018] (3) The present invention realizes the connection of the adjacent inner gear ring and the upper adjustment plate into an integral structure through the provision of the first elastic limit member and the first positioning groove, thereby achieving synchronous rotation. The provision of the first friction plate between the two further ensures that the two can rotate synchronously.

[0019] (4) 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.

[0020] (5) 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.

[0021] (6) 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.

[0022] (7) The present invention can achieve stepless adjustment throughout the entire stroke. By selecting the seal, the sealing and waterproof level of the electric push rod can reach IP68 or higher, which is suitable for more working conditions.

[0023] 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

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the whole of the present invention; Figure 3 This is a schematic diagram of the installation of the switch assembly and the detection assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the inner gear ring of the present invention; Figure 5 This is a schematic diagram of the upper adjustment disk of the present invention; Figure 6 It is a cross-sectional schematic diagram of the lower adjustment disk of the present invention; Figure 7 This is a schematic diagram of the installation of the fine adjustment component of the present invention; Figure 8 It is a cross-sectional schematic diagram of the detection assembly of the present invention; Fig. 9 It is a schematic diagram of installing a first elastic limiting member on the inner gear ring of the present invention; Fig.10 It is a partial enlarged schematic diagram of the fine adjustment component of the present invention; Fig.11 for Figure 2 A partial enlarged schematic diagram in the middle; Fig.12 for Figure 8 A partial enlarged schematic diagram of point B in the middle; Fig.13 for Figure 8 A partial enlarged schematic diagram of point C in the middle; Fig.14 for Figure 8 The partial enlarged schematic diagram of point D in the middle; Fig.15 for Figure 8 A partial enlarged schematic diagram of point E in the middle. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] Embodiment 1 like Figure 1-Figure 15 As shown, this embodiment provides an electric push rod for quickly adjusting a travel switch, 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.

[0028] 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.

[0029] 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 .

[0030] 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.

[0031] 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.

[0032] Embodiment 2 like Figure 8 , Figure 12-Figure 15 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first 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 .

[0033] 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.

[0034] As an improvement, the diameter of the second friction plate 78 is smaller than the diameter of the first friction plate 77 .

[0035] 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.

[0036] Embodiment 3 like Figure 7 , Fig.10 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first 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 .

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In actual applications, users can adjust the minimum installation distance first and then adjust the stroke.

[0041] Embodiment 4 This embodiment provides a method for quickly adjusting the stroke of an electric push rod, so that the electric push rods described in the first to third embodiments above can quickly adjust their stroke and minimum installation distance online, and the specific operation includes the following steps: Quick adjustment of the minimum installation distance of the telescopic tube: open the cover of the adjustment window 31, manually turn the upper adjustment disk 73, change the distance between the first sensing block 738 and the limit switch 64, run the telescopic tube 52 of the motor to the minimum extension position, detect the minimum installation distance of the telescopic tube, and complete the adjustment of the minimum installation distance of the telescopic tube 52 after the minimum installation distance meets the requirements; it should be noted that in the process of turning the upper adjustment disk 73, the lower adjustment disk 74 can be pressed to ensure that the lower adjustment disk 74 does not move. Of course, when adjusting the minimum installation distance, the lower adjustment disk can also move synchronously with the upper adjustment disk; Rapid adjustment of the telescopic tube stroke: open the cover of the adjustment window 31, rotate the lower adjustment disk 74, and keep the upper adjustment disk 73 stationary at this time, change the relative position of the second sensing block 747 on the lower adjustment disk 74 and the limit switch 64, so as to achieve rapid adjustment of the telescopic tube stroke; Minimum installation distance fine adjustment: turn the second adjustment knob 822 to drive the second adjustment rod 82 to move rightward, so that the second adjustment gear 821 and the first outer tooth 736 are meshed and transmitted, turn the second adjustment knob 822 to change the position of the upper adjustment disk 73 relative to the limit switch 64, and realize the fine adjustment of the travel of the telescopic tube 52; during the rotation of the upper adjustment disk 73, the lower adjustment disk 74 rotates synchronously with the upper adjustment disk 73; Fine adjustment of the travel of the telescopic tube 52: Turn 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, and realizing fine adjustment of the minimum installation distance; 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; Preferably, quick and accurate adjustment is achieved through scale lines on the outer sides of the upper adjustment disk and the lower adjustment disk.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric push rod 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 installed on the switch mounting plate (63).

2. The electric push rod for rapid adjustment of a travel switch according to claim 1, characterized in that: 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) sequentially drives the upper adjustment disk (73) and the lower adjustment disk (74) to rotate synchronously, 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).

3. The electric push rod for rapid adjustment of a travel switch according to claim 2, characterized in that: 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) is provided on the upper switch seat (62) for realizing multi-stage mutually meshing gear rotation to reduce speed.

4. The electric push rod for rapid adjustment of a travel switch according to claim 3, characterized in that: 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 with a limit switch (64) is convexly provided on one side of the upper adjustment disk (73).

5. The electric push rod for rapid adjustment of a travel switch according to claim 4, characterized in that: 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).

6. The electric push rod for rapid adjustment of a travel switch according to claim 5, 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).

7. The electric push rod for rapid adjustment of a travel switch according to claim 5, 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).

8. An electric push rod for rapid adjustment of a travel switch according to any one of claims 5 to 7, 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).

9. The electric push rod for rapid adjustment of a travel switch according to claim 8, 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).

10. The electric push rod for rapid adjustment of a travel switch according to claim 8, 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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