CN109185410B

CN109185410B - High-precision push rod

Info

Publication number: CN109185410B
Application number: CN201811088247.8A
Authority: CN
Inventors: 兰宝胜; 马礼华; 黄晓龙
Original assignee: Longyan Zhikang Solar Technology Co Ltd
Current assignee: Longyan Zhikang Solar Technology Co Ltd
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2020-06-05
Anticipated expiration: 2038-09-18
Also published as: CN109185410A

Abstract

The invention belongs to the technical field of electric push rods, and particularly relates to a high-precision push rod which comprises a sleeve, a pushing piece, a screw rod and a driving mechanism, wherein the pushing piece comprises an inner movable seat, an outer movable seat and a plurality of connecting rods; still be equipped with the spacing subassembly of elasticity in the sleeve, including elastic component, apron, clamping ring and spacing bearing, the elastic component encircles and locates on the lead screw and the one end of elastic component and telescopic inner butt, the apron encircles and locates on the lead screw and with the other end butt of elastic component and the centre be equipped with the through-hole that supplies the lead screw to pass, the inner of lead screw is located to spacing bearing rotation cover, the clamping ring encircles and locates on the lead screw and the both ends of clamping ring respectively with spacing bearing and apron butt. The extension of elastic component makes apron, clamping ring and spacing bearing remove to telescopic outer end to further compress tightly the lead screw, make the lead screw keep accurate installation accuracy.

Description

High-precision push rod

Technical Field

The invention belongs to the technical field of electric push rods, and particularly relates to a high-precision push rod.

Background

The Chinese invention patent (with the publication number of CN104930148A) provides an electric push rod device. This electric putter device utilizes first promotion portion spiro union in lead screw, and a plurality of connecting rods that pass the second fixed part of fixed connection between first promotion portion and the second promotion portion to when the lead screw pivoted, drive first promotion portion along the axial round trip movement of lead screw. In the electric push rod, the two ends of the screw rod are rotatably connected with the first bearing and the second bearing, the first bearing and the second bearing are respectively fixed on the first fixing part and the second fixing part, and the bearing and the screw rod are easily worn through long-term use, so that the installation precision of the screw rod is reduced, the gap is enlarged, the screw rod is easy to vibrate during working, the screw rod is easy to vibrate and make abnormal sound during working, and the power output precision and the service life are reduced.

Disclosure of Invention

The invention aims to provide a high-precision push rod, and aims to solve the technical problem that in the prior art, due to long-term use, a bearing and a lead screw are abraded, and the mounting precision of the lead screw is reduced.

In order to achieve the purpose, the invention adopts the technical scheme that: a high-precision push rod comprises a sleeve, pushing pieces, a screw rod and a driving mechanism, wherein each pushing piece comprises an inner movable seat, an outer movable seat and a plurality of connecting rods, the inner movable seats are arranged in the sleeve and are in threaded connection with the screw rod, the inner ends of the connecting rods are fixedly connected with the inner movable seats, the outer ends of the connecting rods penetrate through the outer end of the sleeve and are connected with the outer movable seats, the outer end of the screw rod is rotatably connected with the outer end of the sleeve, the driving mechanism is fixed at the inner end of the sleeve and is connected with the inner end of the screw rod to drive the screw rod to rotate, an elastic limiting assembly is further arranged in the sleeve and comprises an elastic piece, a cover plate, a pressing ring and a limiting bearing, the elastic piece is annularly arranged on the screw rod, one end of the elastic piece is abutted against the inner end of the sleeve, and a through hole for the screw rod to penetrate through is, the apron ring is located on the lead screw and with the other end butt of elastic component, spacing bearing rotationally overlaps and locates the inner of lead screw is in order to restrict the position of lead screw, the clamping ring is located on the lead screw just the both ends of clamping ring respectively with spacing bearing with the apron butt.

Optionally, telescopic inner still is equipped with the adjusting nut that the outer periphery has the external screw thread, adjusting nut with sleeve threaded connection just adjusting nut is close to the one end of sleeve outer end with the elastic component butt, adjusting nut's centre is equipped with and is used for twisting the commentaries on classics adjusting nut and providing the through-hole is changeed in twisting in actuating mechanism power transmission space.

Optionally, the elastic element is an elastic plastic ring, an elastic rubber ring or a pressure spring sleeved on the screw rod.

Optionally, the limit bearing is an end face bearing, a single tapered roller bearing or a pair of tapered roller bearings arranged oppositely.

Optionally, the inner of lead screw is equipped with the location shaft shoulder, the spacing face orientation of location shaft shoulder the telescopic inner, the inner of lead screw still is equipped with the installation component, the installation component includes the lantern ring, solid fixed ring and fastening screw, the lantern ring cover is located the inner of lead screw and with the spacing face butt of location shaft shoulder, just the lantern ring with spacing face butt one end is equipped with the spacing ring, gu fixed ring cover is located just be located on the lead screw keep away from of the lantern ring the one end of spacing face, gu fixed ring's external diameter is greater than the external diameter of the lantern ring, fastening screw with lead screw threaded connection and with gu fixed ring keep away from the one end butt of the lantern ring, spacing bearing housing is located on the lantern ring just spacing bearing's both ends respectively with spacing ring with gu the fixed ring butt.

Optionally, a sliding rail parallel to the connecting rod is further disposed in the sleeve, the inner movable seat includes a first sliding plate, a second sliding plate, and a driving nut sleeved on the lead screw and in threaded connection with the lead screw, the first sliding plate and the second sliding plate are respectively disposed at two ends of the driving nut, and sliding grooves adapted to the sliding rail are disposed on both the first sliding plate and the second sliding plate.

Optionally, the inner movable seat further includes two connecting plates, the first sliding plate is fixedly connected to one end of the driving nut, the second sliding plate is sleeved on the other end of the driving nut, the two connecting plates are symmetrically arranged with respect to the axis of the driving nut, and two ends of the two connecting plates are fixedly connected to the first sliding plate and the second sliding plate respectively.

Optionally, the number of the slide rails is two, the slide rails are symmetrically arranged on two sides of the screw rod, and the first slide plate and the second slide plate are respectively provided with two slide grooves which are in one-to-one correspondence with the two slide rails.

Optionally, the driving mechanism includes a motor and a coupler, and a spindle of the motor is connected to the inner end of the screw rod through the coupler.

Optionally, be equipped with articulated seat on the telescopic outer wall, articulated seat includes the welded seat and is fixed in on the welded seat and be used for with articulated shaft swivelling joint's pivot seat, the welded seat includes first welded plate, second welded plate and third welded plate, first welded plate with second welded plate respectively fixed connection in the both ends of third welded plate, first welded plate the second welded plate with the third welded plate all with telescopic outer wall is tangent and all with telescopic outer wall welding.

The invention has the beneficial effects that: in the high-precision push rod, the limiting bearing is sleeved at the inner end of the screw rod, one end of the elastic piece is abutted with the inner end of the sleeve, the other end of the elastic piece is abutted with the cover plate, meanwhile, the cover plate is abutted with the pressing ring, and the pressing ring is abutted with the limiting bearing, so that elastic limiting is formed between the inner end of the screw rod and the inner end of the sleeve, when the mounting precision of the screw rod is changed, the elastic piece extends to enable the cover plate, the pressing ring and the limiting bearing to move towards the outer end of the sleeve, so that the screw rod is further compressed, the screw rod is enabled to keep accurate mounting precision, vibration and abnormal sound of the screw rod are.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a high-precision push rod according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a high-precision push rod according to an embodiment of the present invention;

FIG. 3 is an exploded view of a high precision push rod provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a screw rod, an inner movable seat and a connecting rod in the high-precision push rod according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a screw rod and an inner movable seat in the high-precision push rod according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-sleeve, 11-slide rail, 12-outer end cover, 13-inner end cover, 2-pushing piece, 21-inner movable seat, 211-first sliding plate, 212-second sliding plate, 213-driving nut, 214-connecting plate, 22-outer movable seat, 23-connecting rod, 3-lead screw, 31-locating shaft shoulder, 4-driving mechanism, 41-motor, 42-coupler, 43-reducer, 5-elastic limiting component, 51-elastic component, 52-cover plate, 53-press ring, 54-limiting bearing, 6-adjusting nut, 61-screwing through hole, 7-mounting component, 71-lantern ring, 711-limiting ring, 72-fixing ring, 73-fastening screw, 8-hinging seat, 81-welding plate, 82-screwing seat.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in fig. 1-5, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below with reference to fig. 1 to 5 are exemplary and intended to be illustrative of the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 2, an embodiment of the present invention provides a high precision push rod, which includes a sleeve 1, a pushing member 2, a screw rod 3 and a driving mechanism 4, where the pushing member 2 includes an inner movable seat 21, an outer movable seat 22 and a plurality of connecting rods 23, the inner movable seat 21 is disposed in the sleeve 1 and is in threaded connection with the screw rod 3 (specifically, the inner movable seat 21 is in threaded connection with the screw rod through a driving nut 213 hereinafter, or the inner movable seat 21 itself is provided with a through hole having an internal thread, so as to achieve threaded connection with the screw rod), an inner end of each connecting rod 23 is fixedly connected with the inner movable seat 21, an outer end of each connecting rod 23 passes through an outer end of the sleeve 1 and is connected with the outer movable seat 22 (specifically, an outer end of each connecting rod 23 passes through an outer end cap 12 hereinafter), an outer end of the screw rod 3 is rotatably connected with an outer end of the sleeve 1, the driving mechanism 4 is fixed at an inner end, still be equipped with the spacing subassembly 5 of elasticity in the sleeve 1, the spacing subassembly 5 of elasticity includes elastic component 51, apron 52, clamping ring 53 and spacing bearing 54, elastic component 51 encircles and locates on the lead screw 3 and the inner butt of one end of elastic component 51 and sleeve 1, be equipped with the through-hole that supplies lead screw 3 to pass in the middle of the apron 52, apron 52 encircle locate on the lead screw 3 and with elastic component 51's the other end butt, spacing bearing 54 rotationally overlaps the position in order to restrict lead screw 3 of locating the inner of lead screw 3, clamping ring 53 encircles and locates on the lead screw 3 and the both ends of clamping ring 53 respectively with spacing bearing 54 and apron 52 butt. In this embodiment, the inner end of the screw rod 3 is sleeved with the limit bearing 54, one end of the elastic piece 51 is abutted to the inner end of the sleeve 1, the other end of the elastic piece is abutted to the cover plate 52, meanwhile, the cover plate 52 is abutted to the pressing ring 53 and the pressing ring 53 is abutted to the limit bearing 54, so that the elastic limit between the inner end of the screw rod 3 and the inner end of the sleeve 1 is formed, when the installation accuracy of the screw rod 3 changes, the elastic piece 51 enables the cover plate 52, the pressing ring 53 and the limit bearing 54 to move towards the outer end of the sleeve 1 through the elastic force of the elastic piece 51, so that the screw rod 3 is further compressed, so that the screw rod 3 keeps accurate installation accuracy, thereby avoiding vibration and abnormal sound of the screw.

In addition, in this embodiment, the pressing ring 53 is disposed between the cover plate 52 and the limit bearing 54, the cross section of the pressing ring 53 perpendicular to the axis thereof is a circular ring surface, the surface of the pressing ring 53 abutting against the limit bearing 54 is the aforementioned circular ring surface, and when the bearing is installed, the screw rod 3 is additionally provided with some fixing structures such as a snap spring, a fastening screw 73, and the like, so that the abutting of the pressing ring 53 and the limit bearing 54 is relatively small, large-area abutting when the cover plate 52 directly abuts against the limit bearing 54 can be avoided, an installation space and a working space are provided for the limit bearing 54 through the pressing ring 53, and the cover plate 52 is prevented from affecting the installation and normal; the cover plate 52 is abutted with the elastic piece 51, so that the cover plate 52 completely bears the acting force of the elastic piece 51 and transmits the acting force to the press ring 53, the contact area between the cover plate 52 and the elastic piece 51 is large, the pressure applied to the elastic piece 51 by the cover plate 52 is small, if the press ring 53 is directly abutted with the elastic piece 51, large pressure is applied to the elastic piece 51, the press ring 53 easily presses the end face of the elastic piece 51 to deform and yield to form an annular groove, and the elastic piece 51 is damaged and fails, so that the pressure borne by the elastic piece 51 can be reduced by additionally arranging the cover plate 52, and the problems of deformation, damage and failure caused by the fact that the elastic piece 51 is subjected to high-strength pressure are avoided.

In the present embodiment, the inner end mentioned above and hereinafter refers to the end close to the driving mechanism 4, and the outer end refers to the end far from the driving mechanism 4.

Optionally, as shown in fig. 2 and fig. 3, the inner end of the sleeve 1 is further provided with an adjusting nut 6 having an external thread on an outer circumferential surface, the adjusting nut 6 is screwed with the sleeve 1, one end of the adjusting nut 6 close to the outer end of the sleeve 1 abuts against the elastic member 51, and a screwing through hole 61 for screwing the adjusting nut 6 and providing a power transmission space for the driving mechanism 4 is provided in the middle of the adjusting nut 6. During long-term use, the elastic member 51 releases the elastic force to push the cover plate 52, the pressing ring 53 and the limit bearing 54 to move, but the elastic force of the elastic member 51 is released to a certain limit, so that the elastic member 51 weakens after long-term use, and the elastic member 51 cannot provide enough elastic force to push the cover plate 52. In this embodiment, the adjusting nut 6 for screwing the through hole 61 is additionally provided to further compress the elastic member 51, so that the elastic member 51 is compressed again, thereby compressing the limit bearing 54 and prolonging the workpiece time of the elastic member 51. In addition, in this embodiment, the installation accuracy of the lead screw 3 is adjusted without disassembling the entire push rod, and the adjusting nut 6 can be exposed only by disassembling the driving mechanism 4 and the inner end cap 13 disposed at the inner end of the sleeve 1, so that the push rod can press the elastic member 51 while maintaining the installation state, thereby adjusting the accuracy of the lead screw 3. In the present embodiment, the adjusting nut 6 has the through hole 61 for power transmission, and the lead screw 3 or the coupling 42 can pass through the through hole 61, thereby preventing the adjusting nut 6 from interfering with power transmission.

Specifically, the twist through hole 61 is an internal hexagonal through hole. The screwing through hole 61 may be a straight groove having a through hole or a cross groove having a through hole, and specifically, a through hole is provided in the middle of the straight groove or the cross groove.

Alternatively, the elastic member 51 is an elastic plastic ring, an elastic rubber ring, or a compression spring. When the elastic member 51 is an elastic plastic ring or an elastic rubber ring, the cover plate 52 can reduce the pressure on the elastic plastic ring, thereby avoiding deformation and damage; in addition, the cover plate 52 can bear the elastic force of the elastic piece 51 and release the elastic force uniformly, so that the elastic piece 51 is prevented from being locally pressed and yielding to influence the moving distance of the elastic piece 51 to the press ring 53 and the limit bearing 54. When the elastic piece 51 is a pressure spring, the elastic piece 51 can be borne and the elastic force can be released uniformly, and the deformation of the end part of the pressure spring caused by the dislocation of the pressure spring when the pressure spring is directly abutted to the compression ring 53 is avoided, so that the transmission of the elastic force is disabled.

Alternatively, the limit bearing 54 is an end face bearing, a single tapered roller bearing, or a pair of oppositely disposed tapered roller bearings. A pair of oppositely disposed tapered roller bearings is preferred in this embodiment, which are capable of withstanding axial and radial forces.

Specifically, in this embodiment, the two tapered roller bearings arranged in pairs are all sleeved at the inner end of the lead screw 3, the outer rings of the two tapered roller bearings face outwards, the inner rings of the two tapered roller bearings are abutted, the outer ring of one of the tapered roller bearings is abutted with the pressing ring 53, the inner ring of the other tapered roller bearing is abutted with the limiting structure on the lead screw 3, and the pressing ring 53 is abutted with the outer ring of the corresponding tapered roller bearing.

Optionally, as shown in fig. 2, a positioning shoulder 31 (i.e., a limiting structure on the screw rod 3) is disposed at an inner end of the screw rod 3, a limiting surface of the positioning shoulder 31 faces the inner end of the sleeve 1, an installation assembly 7 is further disposed at the inner end of the screw rod 3, the installation assembly 7 includes a collar 71, a fixing ring 72 and a fastening screw 73, the collar 71 is sleeved at the inner end of the screw rod 3 and abuts against the limiting surface of the positioning shoulder 31, a limiting ring 711 is disposed at one end of the collar 71 abutting against the limiting surface, the fixing ring 72 is sleeved on the screw rod 3 and is located at one end of the collar 71 far away from the limiting surface, an outer diameter of the fixing ring 72 is larger than an outer diameter of the collar 71, the locking screw is in threaded connection with the screw rod 3 and abuts against one end of the fixing ring 72 far away from the collar 71, the limiting bearing 54. In this embodiment, the limit bearing 54 is fixed at the inner end of the screw rod 3 by the mounting assembly 7, specifically, the collar 71 abuts against the limit surface of the positioning shoulder 31, and the other end of the collar 71 is provided with the fixing ring 72 and the fastening screw 73, so as to limit the position of the collar 71, while the limit bearing 54 is mounted on the collar 71, and the two ends of the limit bearing 54 abut against the limit ring 711 and the fixing ring 72, respectively, so as to fix the position of the limit bearing 54.

Specifically, the inner ring of one of the tapered roller bearings abuts against the fixed ring 72, and the inner ring of the other tapered roller bearing abuts against the stopper ring 711 on the collar 71.

Optionally, two fastening screws 73 arranged side by side may be provided to enhance the locking effect of the collar 71, preventing the locking screws 73 from loosening.

Optionally, as shown in fig. 2 and fig. 3, a sliding rail 11 parallel to the connecting rod 23 is further disposed in the sleeve 1, the inner movable seat 21 includes a first sliding plate 211, a second sliding plate 212, and a driving nut 213 sleeved on the screw rod 3 and in threaded connection with the screw rod 3, the first sliding plate 211 and the second sliding plate 212 are respectively disposed at two ends of the driving nut 213, and sliding grooves adapted to the sliding rail 11 are disposed on both the first sliding plate 211 and the second sliding plate 212. The driving mechanism 4 drives the screw rod 3 to rotate through the driving nut 213, the screw rod 3 drives the driving nut 213 to move through the thread, the screw rod 3 applies a torsion force to the driving nut 213, so that the inner movable seat 21 applies a torsion force to the inner end of each connecting rod 23, and each connecting rod 23 is twisted or even bent. In this embodiment, specifically, the inner end of each connecting rod 23 is fixedly connected to the first sliding plate 211 or the second sliding plate 212, the sliding rail 11 and each connecting rod 23 together guide the inner movable seat 21 to move along the sleeve 1, and after a torsion is applied to the inner movable seat 21, an acting force is applied to the sliding rail 11 through the first sliding plate 211 and the second sliding plate 212 in the inner movable seat 21, because the sliding rail 11 is a rigid structure and is not easily deformed, the sliding rail 11 replaces each connecting rod 23 to bear the acting force applied by the inner movable seat 21, thereby preventing each connecting rod 23 from bending and deforming due to the torsion applied by the inner movable seat 21, keeping each connecting rod 23 in a straight state, and ensuring stable operation of the push rod.

In addition, in this embodiment, the first sliding plate 211 and the second sliding plate 212 are respectively disposed at two ends of the driving nut 213, so that two sliding connection pairs are formed, so that the guide rail has a better guiding effect. Further, the first sliding plate 211 and the second sliding plate 212 are simple in structure and light in weight, and the weight of the inner movable base 21 can be reduced, thereby reducing the cost.

In this embodiment, the first sliding plate 211 is located at one end of the driving nut 213 facing the driving mechanism 4, the second sliding plate 212 is provided with through holes correspondingly adapted to the respective connecting rods 23, the inner end of each connecting rod 23 is fixedly connected to the first sliding plate 211, and the outer end of each connecting rod 23 passes through the corresponding through hole on the second sliding plate 212. Thus, the inner ends of the connecting rods 23 are connected with the inner movable seat 21 at two positions, and the through holes on the second sliding plate 212 can guide the connecting rods 23 to avoid bending of the connecting rods 23, so that the connecting device has a better connecting effect.

Specifically, as shown in fig. 2 to 5, the inner movable seat 21 further includes two connecting plates 214, the first sliding plate 211 is fixedly connected to one end of the driving nut 213, the second sliding plate 212 is sleeved on the other end of the driving nut 213, the two connecting plates 214 are symmetrically disposed about the axis of the driving nut 213, and two ends of the two connecting plates 214 are respectively fixedly connected to the first sliding plate 211 and the second sliding plate 212. In this embodiment, the inner movable seat 21 is divided into five parts, which are respectively a driving nut 213, a first sliding plate 211, a second sliding plate 212 and two connecting plates 214, the first sliding plate 211 is fixedly connected with the driving nut 213, and the two connecting plates 214 fix the second sliding plate 212, which is sleeved with the other end of the driving nut 213, so as to form the inner movable seat 21 with a firm structure and convenient installation and disassembly. And each part can be independently processed or purchased in batches, so that the cost is lower.

In addition, the first sliding plate 211 is directly and fixedly connected with each connecting rod 23, each connecting rod 23 is pushed to move through the first sliding plate 211, the second sliding plate 212 is used for guiding each connecting rod 23 to avoid bending, power is not required to be output through the second sliding plate 212, and therefore the second sliding plate 212 is sleeved at the other end of the driving nut 213 and is fixed through the two connecting plates 214.

Specifically, the slide rail 11 is fixed to the inner surface of the sleeve 1 by screws, or the slide rail 11 is integrally connected to the sleeve 1.

Optionally, the number of the slide rails 11 is two, and the slide rails are symmetrically disposed on two sides of the screw rod 3, and two slide grooves corresponding to the two slide rails 11 one to one are disposed on the first slide plate 211 and the second slide plate 212. The two slide rails 11 are arranged, so that the guiding effect of the slide rails 11 is further increased, meanwhile, the two slide rails 11 share the effect exerted by the inner movable seat 21, and the two slide rails 11 bear smaller acting force respectively.

Further, as shown in fig. 2 or fig. 3, the driving mechanism 4 includes a motor 41, the screw rod 3 is rotatably disposed in the sleeve 1 and is in threaded connection with the inner movable seat 21, the motor 41 is disposed at the inner end of the sleeve 1, and a main shaft of the motor 41 is connected with the screw rod 3 and drives the screw rod 3 to rotate. Specifically, the motor 41 may be fixed to the inner end surface of the sleeve 1, or disposed inside the inner end of the sleeve 1. Under the drive of the motor 41, the screw rod 3 is driven to rotate forwards or reversely, the inner movable seat 21 in threaded connection with the screw rod 3 is driven to move, and the connecting rod 23 is made to do telescopic motion.

Further, as shown in fig. 2 or fig. 3, the driving mechanism 4 further includes a coupling 42, and the coupling 42 is connected between the motor 41 and the lead screw 3 for transmitting the torque of the motor 41 to the lead screw 3. Specifically, the main shaft of the motor 41 is connected to the lead screw 3 through the coupling 42, and the coupling 42 functions to buffer the vibration of the motor 41, so that the driving force is transmitted to the lead screw 33 more smoothly.

Optionally, in this embodiment, the coupling 42 is an sliding block coupling 42, and the sliding block coupling 42 compensates for a coaxiality deviation between the spindle of the motor 41 and the lead screw 3, and compensates for an increased distance between the lead screw 3 and the motor 41 caused by pushing the lead screw 3 by the elastic limiting assembly 5, so as to maintain stable transmission of power.

Optionally, as shown in fig. 2, the driving mechanism 4 further comprises a speed reducer 43, and the speed reducer 43 is connected between the motor 41 and the coupling 42 for adjusting the transmission ratio between the motor 41 and the lead screw 3. The speed reducer 43 is connected between the motor 41 and the screw rod 3, and is used for reducing the rotating speed transmitted to the screw rod 3, increasing the torque of the screw rod 3, and further increasing the driving force output by the screw rod 3. More specifically, the speed reducer 43 is provided intermediate the motor 41 and the coupling 42.

Alternatively, as shown in fig. 2, the outer end of the sleeve 1 is provided with an outer end cap 12, each connecting rod 23 passes through the outer end cap 12 to be connected with the outer movable seat 22, the inner end of the sleeve 1 is provided with an inner end cap 13, the motor 41 is fixed on the outer surface of the inner end cap 13, and the main shaft of the motor 41 passes through the inner end cap 1313 to be connected with the aforementioned coupling 42 or the screw rod 3.

Optionally, as shown in fig. 2 and 3, an articulated seat 8 for fixing the whole high-precision push rod is arranged on the outer wall of the sleeve 1, the articulated seat 8 includes a welded plate 81 and a rotating shaft seat 82 fixed on the welded plate 81 and used for being rotatably connected with the hinge shaft, the welded plate 81 includes a first welded plate, a second welded plate and a third welded plate, the first welded plate and the second welded plate are respectively and fixedly connected to two ends of the third welded plate, and the first welded plate, the second welded plate and the third welded plate are tangent to the outer wall of the sleeve 1. Three boards on the welding board 81 are tangent with the sleeve is trilateral, and first welding board, second welding board and third welding board weld with sleeve 1's outer wall respectively, realize welding board 81 and sleeve 1's trilateral welding, have increased the stability that welding board 81 and sleeve 1 are connected.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision push rod comprises a sleeve, a pushing piece, a screw rod and a driving mechanism, wherein the pushing piece comprises an inner movable seat, an outer movable seat and a plurality of connecting rods, the inner movable seat is arranged in the sleeve and is in threaded connection with the screw rod, the inner end of each connecting rod is fixedly connected with the inner movable seat, the outer end of each connecting rod penetrates through the outer end of the sleeve and is connected with the outer movable seat, the outer end of the screw rod is rotatably connected with the outer end of the sleeve, and the driving mechanism is fixed at the inner end of the sleeve and is connected with the inner end of the screw rod to drive the screw rod to rotate, and is characterized in that: the sleeve is internally provided with an elastic limiting assembly, the elastic limiting assembly comprises an elastic piece, an cover plate, a pressing ring and a limiting bearing, the elastic piece is annularly arranged on the screw rod, one end of the elastic piece is abutted to the inner end of the sleeve along the axial direction, a through hole for the screw rod to pass through is arranged in the middle of the cover plate, the cover plate is annularly arranged on the screw rod and is abutted to the other end of the elastic piece, the limiting bearing is a limiting bearing capable of bearing axial acting force at least, the limiting bearing is rotatably sleeved at the inner end of the screw rod to limit the position of the screw rod, the limiting bearing is arranged on the inner wall of the sleeve, the pressing ring is annularly arranged on the screw rod, two ends of the pressing ring are respectively abutted to the limiting bearing and the cover plate, and two axial end faces of the limiting bearing are respectively axially abutted to a limiting structure on the screw, the elastic piece is used for enabling the cover plate, the pressing ring and the limiting bearing to move towards the outer end of the sleeve through the elastic force of the elastic piece so as to press the screw rod; the inner of lead screw still is equipped with the installation component that is used for being fixed in the inner of lead screw with spacing bearing.

2. The high-precision push rod according to claim 1, characterized in that: the telescopic inner still is equipped with the adjusting nut that the outer periphery has the external screw thread, adjusting nut with sleeve threaded connection just adjusting nut is close to the one end of sleeve outer end with the elastic component butt, adjusting nut's centre is equipped with and is used for twisting the commentaries on classics adjusting nut and providing the through-hole is changeed in twisting in actuating mechanism power transmission space.

3. The high-precision push rod according to claim 1, characterized in that: the elastic piece is an elastic plastic ring, an elastic rubber ring or a pressure spring sleeved on the screw rod.

4. The high-precision push rod according to claim 1, characterized in that: the limiting bearing is an end face bearing, a single tapered roller bearing or a pair of tapered roller bearings which are arranged oppositely.

5. The high-precision push rod according to any one of claims 1 to 4, characterized in that: the inner of lead screw is equipped with the location shaft shoulder, the spacing face orientation of location shaft shoulder the telescopic inner, the installation component includes the lantern ring, solid fixed ring and fastening screw, the lantern ring cover is located the inner of lead screw and with the spacing face butt of location shaft shoulder, just the lantern ring with spacing face butt one end is equipped with the spacing ring, gu fixed ring cover is located on the lead screw and be located keeping away from of the lantern ring the one end of spacing face, gu fixed ring's external diameter is greater than the external diameter of the lantern ring, fastening screw with lead screw threaded connection and with gu fixed ring keep away from the one end butt of the lantern ring, spacing bearing housing is located on the lantern ring just spacing bearing's both ends respectively with the spacing ring with gu fixed ring butt.

6. The high-precision push rod according to any one of claims 1 to 4, characterized in that: the sleeve is internally provided with a sliding rail parallel to the connecting rod, the inner movable seat comprises a first sliding plate, a second sliding plate and a driving nut which is sleeved on the screw rod and is in threaded connection with the screw rod, the first sliding plate and the second sliding plate are respectively arranged at two ends of the driving nut, and sliding grooves matched with the sliding rail are respectively arranged on the first sliding plate and the second sliding plate.

7. The high-precision push rod according to claim 6, characterized in that: the inner movable seat further comprises two connecting plates, the first sliding plate is fixedly connected with one end of the driving nut, the second sliding plate is sleeved on the other end of the driving nut, the two connecting plates are symmetrically arranged with the axis of the driving nut, and two ends of the two connecting plates are respectively fixedly connected with the first sliding plate and the second sliding plate.

8. The high-precision push rod according to claim 7, wherein: the number of the slide rails is two, the slide rails are symmetrically arranged on two sides of the screw rod, and the first sliding plate and the second sliding plate are respectively provided with two slide grooves which are in one-to-one correspondence with the two slide rails.

9. The high-precision push rod according to any one of claims 1 to 4, characterized in that: the driving mechanism comprises a motor and a coupler, and a main shaft of the motor is connected with the inner end of the screw rod through the coupler.

10. The high-precision push rod according to any one of claims 1 to 4, characterized in that: be equipped with articulated seat on the telescopic outer wall, articulated seat includes the welded seat and is fixed in on the welded seat and be used for with articulated shaft swivelling joint's pivot seat, the welded seat includes first welded plate, second welded plate and third welded plate, first welded plate with second welded plate respectively fixed connection in the both ends of third welded plate, first welded plate the second welded plate with the third welded plate all with the tangent and all with telescopic outer wall welding.