CN110814716A - Nut-screwing device and nut-screwing mechanism - Google Patents

Abstract

The invention belongs to the technical field of fasteners, and in particular relates to a nut screwing device and a nut screwing mechanism. The nut tightening mechanism includes a mounting seat, a sleeve mounted on the mounting seat and used to fit the nested nut, and a rotary driving member for driving the sleeve to rotate to provide tightening torque, and one end of the sleeve away from the mounting seat is provided with a The nested part of the nested nut is adapted, and the power output shaft of the rotary driving part is drivingly connected with the sleeve, and drives the sleeve to rotate around its own axis, so that the nested part drives the nut to rotate and tightens the nut. The nut tightening operation is mechanized and has a high degree of automation, which can effectively reduce the labor intensity of the operator and improve the work efficiency; and during the nut tightening process, the tightening torque applied to the nut can also be controlled by controlling the power output of the rotating drive to make it match the Match the torque required to tighten the nut to ensure that the nut will not be damaged by excessive torque, or the nut will not be tightened in place when the torque is too small.

Description

Nut-screwing device and nut-screwing mechanism

technical field

The invention belongs to the technical field of fasteners, and in particular relates to a nut screwing device and a nut screwing mechanism.

Background technique

In the field of mechanical engineering, nuts are very common fasteners, which are often used in conjunction with bolts or screws; when in use, the nut needs to be tightened by external force before it can play a tightening role. In the prior art, a hook wrench is often used to perform the tightening operation. During the operation, the operator manually tightens the nut by holding the hook wrench, which has high labor intensity and low operation efficiency. In addition, when manually tightening the nut, it is impossible to accurately control the tightening torque acting on the nut. The operator judges whether the nut is tightened by experience, and the prediction is often inaccurate, resulting in insufficient tightening of the nut, or excessive force causing slip wire damage. nut.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a nut-tightening device and its nut-tightening mechanism, which aims to solve the technical problems of high labor intensity, low work efficiency and uncontrollable tightening torque in the prior art using a hook wrench to manually screw a nut.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a nut screwing mechanism, comprising a mounting seat, a sleeve mounted on the mounting seat and used to fit the nested nut, and a sleeve for driving the sleeve to rotate In order to provide a rotary driver for tightening torque, one end of the sleeve away from the mounting seat is provided with a nesting portion for fitting and nesting the nut, and the power output shaft of the rotary driver is connected to the sleeve. The driving connection is used to drive the sleeve to rotate around its own axis, so that the nested portion drives the nut to rotate and tightens the nut.

Further, the nut tightening mechanism further includes a transmission assembly, the transmission assembly includes a driving gear, a driven gear and a transmission shaft, the driving gear is connected with the power output shaft of the rotary drive member, the

The driven gear is in meshing connection with the driving gear, the transmission shaft and the sleeve both have opposite first and second ends, the nesting portion is provided on the first end of the sleeve, the The driven gear is sleeved on the first end of the transmission shaft, and the second end of the sleeve is connected with the second end of the transmission shaft.

Further, the mounting seat includes a mounting plate and a mounting cylinder, the rotary driving member is mounted on the mounting plate, the driving gear and the driven gear are rotated and mounted on the mounting plate along the horizontal direction, so The mounting plate is provided with a connecting through hole at the position facing the driven gear, the mounting cylinder is fixed under the mounting plate, the transmission shaft is penetrated in the mounting cylinder, and the transmission shaft is The first end protrudes from the connecting through hole and is sleeved with the driven gear, the first end of the sleeve protrudes from the end of the mounting sleeve away from the mounting plate, and the transmission shaft can Under the action of an external force, the mounting cylinder moves up and down along its own axis direction, thereby driving the sleeve to reciprocate up and down, so that the nesting portion is nested or separated from the nut.

Further, the transmission assembly further includes a spline nut, a first bearing and a second bearing, the first bearing is embedded in the connecting through hole, and the spline nut is sleeved on the first bearing of the transmission shaft. At one end, the spline nut and the transmission shaft form a ball spline, the spline nut passes through the first bearing and is fixed to the inner ring of the first bearing, and one end of the spline nut extends Out of the mounting plate and being keyed with the driven gear, the second bearing is embedded in the mounting barrel, and the other end of the spline nut extends out of the connecting through hole and is connected with the first bearing. The inner rings of the two bearings are fixed so as to be rotatably connected with the mounting cylinder through the second bearing.

Further, the second end of the transmission shaft is connected with the second end of the sleeve through a transmission connection piece, the transmission connection piece includes a first connection head, a second connection head and a connection section, the first connection The head is connected to the second end of the transmission shaft, the second connection head is connected to the second end of the sleeve, and the second connection head is rotatably connected to the first connection head through the connection joint, Therefore, the sleeve can rotate relative to the transmission shaft.

Further, a first connecting shaft and a second connecting shaft, which are arranged in a crisscross pattern, protrude from the side wall of the connecting section, and the first connecting head is rotatably connected to the connecting section through the first connecting shaft, The second connecting head is rotatably connected with the connecting joint through the second connecting shaft, and the first connecting head, the connecting joint and the second connecting head together form a universal joint structure.

Further, the nut tightening mechanism further includes a positioning assembly for defining the coaxial connection between the sleeve and the transmission shaft, and the positioning assembly includes a coaxial arrangement with the transmission shaft and sleeved on the transmission shaft An external elastic positioning member, one end of the elastic positioning member is connected with the transmission shaft, and the other end of the elastic positioning member is connected with the sleeve and elastically pushes the sleeve, so that the The axis remains coincident with the axis of the drive shaft.

Further, the elastic positioning member is a spring sleeved on the outside of the transmission shaft, and the positioning assembly further includes a first spring fixing seat and a second spring fixing seat whose outlines are adapted to the mounting cylinder. The first spring fixing seat is sleeved on the second end of the transmission shaft, the second spring fixing seat is sleeved on the second end of the sleeve, and both ends of the spring are respectively embedded in the first In a spring fixing seat and the second spring fixing seat, when the transmission shaft drives the first spring fixing seat and the second spring fixing seat to rise to a predetermined position, the first spring fixing seat and the second spring fixing seat The second spring fixing seats are all accommodated in the mounting cylinder.

Further, the rotary drive member includes a drive motor and a reducer, the output shaft of the drive motor is connected with the input shaft of the reducer, the output shaft of the reducer is connected with the rotating shaft of the driving gear, the The reducer is mounted on the mounting plate through a reducer fixing seat, and the driving gear is accommodated in the reducer fixing seat.

The above-mentioned one or more technical solutions in the nut-tightening mechanism provided by the present invention have at least one of the following technical effects: when in use, the sleeve is moved to make the nested part and the nut nestedly connected, and then the rotary drive is activated to provide Tightening torque, the power take-off shaft of the rotating drive member drives the sleeve to rotate around its own axis, and the sleeve rotates at the same time to drive the nut nested in the nested part to rotate, so as to tighten the nut, and then move the sleeve to the nest after the nut is tightened. Parts can be removed from the nut. In this way, the use of the nut tightening mechanism can realize automatic tightening of the nut, the nut tightening operation is mechanized and has a high degree of automation, which can effectively reduce the labor intensity of the operator and improve the working efficiency; in addition, during the nut tightening process, it can also be driven by controlling the rotation. The power output size of the part controls the tightening torque applied to the nut. Before operation, set the torque output size of the rotary drive part to match the torque required for tightening the nut. The rotary drive part drives the sleeve to apply the specified torque to After the nut is threaded, the rotating drive will automatically stop, and there will be no damage to the nut due to excessive torque or insufficient tightening of the nut due to too small torque. The tightened nut is not easy to loosen, and the tightened connection is more stable and reliable.

Another technical solution of the present invention is: a nut screwing device, comprising the above-mentioned nut screwing mechanism.

The nut-tightening device of the present invention uses the above-mentioned nut-tightening mechanism, which can realize the automatic operation of nut tightening, thereby effectively reducing the labor intensity of the operator and improving the work efficiency, and it can also control the power of the rotary drive member by controlling The output size can control the tightening torque applied to the nut. When tightening the nut, the nut will not be damaged due to excessive torque, or the nut will not be tightened in place due to excessive torque. The tightened nut is not easy to loosen and the tightening connection is more stable. reliable.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a nut tightening mechanism provided by an embodiment of the present invention;

Figure 2 is an exploded schematic view of the nut tightening mechanism shown in Figure 1;

Fig. 3 is a sectional view along line A-A in Fig. 1;

Fig. 4 is a partial exploded schematic view of the nut tightening mechanism shown in Fig. 1;

FIG. 5 is a schematic structural diagram of the sleeve of the nut tightening mechanism shown in FIG. 1 .

Among them, each reference sign in the figure:

10—sleeve 11—nested part 20—rotation drive

21—PTO shaft 22—Drive motor 23—Reducer

30—Mounting seat 31—Mounting plate 32—Mounting barrel

40—transmission assembly 41—drive gear 42—driven gear

43—drive shaft 44—drive connector 45—spline nut

46—First bearing 47—Second bearing 50—Locating assembly

51—Elastic positioning piece 52—First spring fixing seat

53—Second spring fixing seat 111—Annular abutting wall 311—Connecting through hole

431—Anti-fallout pin 441—First connector 442—Second connector

443—Connecting Section 2311—Reducer Mounting Base 4411—First Connection Hole

4412—the first connection ear 4421—the second connection hole 4422—the second connection ear

4431—the first connecting shaft 4432—the second connecting shaft.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to FIGS. 1 to 5 are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention.

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

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As shown in Figures 1 to 5, an embodiment of the present invention provides a nut tightening mechanism, which is suitable for installation and maintenance of nuts on mechanical structures, and is especially suitable for nuts that require a large torque to be tightened, such as 150NM above torque, etc. Specifically, the nut-tightening mechanism includes a mounting seat 30, a sleeve 10 mounted on the mounting seat 30 and used to fit the nested nut, and a rotary driver for driving the sleeve 10 to rotate to provide tightening torque 20. One end of the sleeve 10 away from the mounting seat 30 is provided with a nesting portion 11 for fitting the nested nut, and the power output shaft 21 of the rotary driver 20 is drivingly connected with the sleeve 10 and used to drive the sleeve 10 around its own axis Rotate so that the nesting portion 11 rotates the nut and tightens the nut.

In the nut tightening mechanism of the embodiment of the present invention, when in use, the sleeve 10 is moved to make the nesting part 11 and the nut nested and connected, and then the rotary driving member 20 is activated to provide tightening torque, and the power output shaft 21 of the rotary driving member 20 is rotated. The sleeve 10 is driven to rotate around its own axis, and the sleeve 10 can rotate at the same time to drive the nut nested in the nesting portion 11 to rotate, thereby tightening the nut. Can. In this way, the use of the nut tightening mechanism can realize automatic tightening of the nut, the nut tightening operation is mechanized and has a high degree of automation, which can effectively reduce the labor intensity of the operator and improve the working efficiency; in addition, during the nut tightening process, it can also be driven by controlling the rotation. The power output size of the nut 20 controls the tightening torque applied to the nut. Before operation, set the torque output size of the rotary driver 20 to match the torque required for tightening the nut. The rotary driver 20 drives the sleeve 10 to the specified size. After the torque of the nut is applied to the nut, the rotating drive part 20 can automatically stop, and the nut will not be damaged due to excessive torque, or the nut cannot be tightened in place due to excessive torque. The tightened nut is not easy to loosen, and the tightening connection is more stable. reliable.

Specifically, in this embodiment, the rotary driving member 20 may be a rotary driving member 20 including a servo motor, etc. When in use, the rotation speed of the servo motor can be set according to the torque required for tightening the nut, and the tightening can be realized. Automatic torque control to provide the right amount of torque to tighten the nut.

More specifically, in this embodiment, as shown in FIG. 2 and FIG. 5 , the nesting portion 11 is a groove recessed at the end of the sleeve 10 and capable of accommodating the nut, and the inner wall surface of the groove has a groove with the nut. The annular abutting wall 111 is adapted in shape. For example, when the nut to be tightened is a hexagonal nut, the annular abutting wall 111 has six abutting wall surfaces corresponding to the six side walls of the nut; thus, when the nut is nested When inside the nesting portion 11 , the outer wall of the nut is in contact with the annular abutting wall 111 . When the sleeve 10 rotates, the nut abuts against the annular abutting wall 111 and can rotate together with the sleeve 10 .

In another embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the nut tightening mechanism further includes a transmission assembly 40 , and the rotary driving member 20 transmits the tightening torque to the sleeve 10 through the transmission assembly 40 , specifically , the transmission assembly 40 comprises a driving gear 41, a driven gear 42 and a transmission shaft 43, the driving gear 41 is connected with the power output shaft 21 of the rotary drive member 20, the driven gear 42 is meshed with the driving gear 41, and the transmission shaft 43 and the sleeve 10 have opposite first and second ends, the nesting part 11 is arranged on the first end of the sleeve 10, the driven gear 42 is sleeved on the first end of the transmission shaft 43, the second end of the sleeve 10 is connected to the first end of the sleeve 10. The second end of the transmission shaft 43 is connected. In this way, when the rotary driving member 20 is activated, the power output shaft 21 of the rotary driving member 20 rotates and drives the driving gear 41 to rotate, the driving gear 41 rotates and drives the driven gear 42 to rotate, and the driven gear 42 drives the transmission shaft 43 to rotate around its own axis. The shaft 43 further drives the sleeve 10 to rotate around its own axis, thereby tightening the nut. The transmission structure is simple and compact, which helps to reduce the overall volume of the tightening mechanism, and the tightening torque is transmitted through the meshing of the driving gear 41 and the driven gear 42. For nuts requiring different tightening torques, the driving gear with different transmission ratios can be replaced by 41 and the driven gear 42 are realized, and the use is more flexible and convenient.

In another embodiment of the present invention, as shown in FIG. 2 and FIG. 3 , the mounting base 30 includes a mounting plate 31 and a mounting cylinder 32 , the rotary driving member 20 is mounted on the mounting plate 31 , a driving gear 41 and a driven gear 42 It is rotated and mounted on the mounting plate 31 in the horizontal direction. Specifically, the driving gear 41 is mounted on one side of the mounting plate 31, and the driven gear 42 is mounted on the other side of the mounting plate 31. The driven gear 42 and the driving gear 41 Displaced in the vertical direction, the space above the driven gear 42 is free and will not interfere with other objects. A connecting through hole 311 is formed at the position of the mounting plate 31 facing the driven gear 42 , the mounting cylinder 32 is fixed under the mounting plate 31 , the transmission shaft 43 is inserted into the mounting cylinder 32 , and the first end of the transmission shaft 43 is connected from the The through hole 311 passes through and is sleeved with the driven gear 42. The first end of the sleeve 10, that is, the nesting portion 11, can protrude from the end of the mounting cylinder 32 away from the mounting plate 31, and the transmission shaft 43 can be installed under the action of external force. The barrel 32 reciprocates up and down along its own axis direction, thereby driving the sleeve 10 to reciprocate up and down to make the nesting portion 11 nest or disengage the nut.

When the nut-tightening mechanism of this embodiment is used to perform the tightening operation, the transmission shaft 43 moves downward along its axis in the mounting barrel 32 under the external force, and drives the first end of the sleeve 10 to move close to the nut, so that the sleeve 10. The nesting portion 11 at the first end is nested with the nut. On the contrary, after the tightening operation is completed, the drive shaft 43 drives the sleeve 10 to move in the reverse direction under the external force operation until the nesting portion 11 is released from the nut. No other structure is provided above the driven gear 42, and a large enough space is reserved above the driven gear 42 for installing the external driving member that drives the transmission shaft 43 to move up and down. The setting of the external driving member is not affected by other structures of the tightening mechanism itself , so that the nut-tightening mechanism of this embodiment can be better used in conjunction with external equipment, and by replacing the driven gears 42 of different sizes, it can be determined to reserve a suitable installation space to match the drive parts of different sizes. , the equipment modification will not interfere with other original structures.

Specifically, in this embodiment, as shown in FIGS. 2 to 4 , the transmission assembly 40 further includes a spline nut 45 , a first bearing 46 and a second bearing 47 . The first bearing 46 is embedded in the connecting through hole 311 , from The moving gear 42 is sleeved on the outside of the spline nut 45, the spline nut 45 is sleeved on the first end of the transmission shaft 43, the spline nut 45 and the transmission shaft 43 form a ball spline; the spline nut 45 passes through the first bearing 46 And fixed with the inner ring of the first bearing 46, one end of the spline nut 45 protrudes from the mounting plate 31 and is keyed with the driven gear 42, such as a flat key connection, etc., the second bearing 47 is embedded in the mounting cylinder 32, The other end of the spline nut 45 extends out of the connecting through hole 311 and is fixed to the inner ring of the second bearing 47 so as to be rotatably connected to the mounting cylinder 32 through the second bearing 47 .

More specifically, in this embodiment, as shown in FIGS. 2 to 4 , the transmission shaft 43 is a spline shaft, and the outer wall surface of the first end is provided with a plurality of track protrusions (not shown) evenly spaced apart, such as The outer peripheral wall of the transmission shaft 43 is divided into three rail projections arranged at 120 degrees, and six load ball rows are formed on the outer peripheral wall of the transmission shaft 43. The balls in the corresponding parts of the spline nut are clamped on the left and right sides of the corresponding rail projections. In this way, the load ball row can reduce the frictional force between the outer wall surface of the transmission shaft 43 and the outer wall surface of the spline nut 45 , thereby saving the external force for driving the transmission shaft 43 to move up and down. More specifically, the middle part of the transmission shaft 43 is also vertically connected with a stop pin 431, the length of the stop pin 431 is greater than the outer diameter of the spline nut 45, and the stop pin 431 can be used to prevent the transmission shaft 43 from being pulled under the action of external force. until it is released from the installation barrel 32 .

In another embodiment of the present invention, as shown in FIGS. 2 to 4 , the second end of the transmission shaft 43 is connected with the second end of the sleeve 10 through a transmission connection piece 44 , and the transmission connection piece 44 includes a first connection head 441 , the second connecting head 442 and the connecting section 443, the first connecting head 441 is connected to the second end of the transmission shaft 43, the second connecting head 442 is connected to the second end of the sleeve 10, and the second connecting head 442 passes through the connecting section 443 It is rotatably connected with the first connector 441 . In this way, the sleeve 10 can be rotated relative to the transmission shaft 43. When other objects are arranged around the nut, which makes it inconvenient for the nut-tightening mechanism of this embodiment to move to the top of the nut as a whole, the sleeve 10 can be rotated to change the relationship between the sleeve 10 and the transmission. The connection angle of the shaft 43 makes the sleeve 10 move to the right above the nut at a suitable angle, so that the nut can be nested into the nesting part 11, and then the rotary drive 20 is activated, and the tightening torque can still pass through the transmission connection. 44 is transmitted to the nesting part 11 of the sleeve 10, and the torque cannot be transmitted due to the change of the connection angle between the sleeve 10 and the transmission shaft 43; There may be a situation where the nut and the transmission shaft 43 are not concentric, and by setting the above-mentioned transmission connecting piece 44, the sleeve 10 rotates to adjust the connection angle between it and the transmission shaft 43, the nut and the transmission shaft 43 rotate coaxially, and the nut rotates Smoother, more labor-saving and reliable tightening operation.

Specifically, in this embodiment, as shown in FIGS. 2 to 4 , a first connecting shaft 4431 and a second connecting shaft 4432 that are arranged in a crisscross pattern protrude from the side wall of the connecting section 443 , and the first connecting head 441 The first connecting shaft 4431 is rotatably connected with the connecting section 443, the second connecting head 442 is rotatably connected with the connecting section 443 through the second connecting shaft 4432, and the first connecting head 441, the connecting section 443 and the second connecting head 442 together form a universal joint Section structure. In this way, the connecting section 443 is rotatably connected with the first connecting head 441 through the first connecting shaft 4431, and can rotate with the first connecting shaft 4431 as the rotating shaft, and the connecting section 443 is rotatably connected with the second connecting head 442 through the second connecting shaft 4432, And the second connecting shaft 4432 can be used as a rotating shaft to rotate, so that the sleeve 10 can be rotated using the first connecting shaft 4431 and the second connecting shaft 4432 as rotating shafts. Specifically, two oppositely disposed first connecting ears 4412 protrude from the end of the second connecting head 442 toward which the first connecting head 441 faces, and the two first connecting ears 4412 are respectively provided with holes for the first connecting shaft 4431 to rotate through. The first connecting hole 4411 is provided, and the end of the first connecting head 441 facing the second connecting head 442 protrudes with two oppositely arranged second connecting ears 4422. The connecting shaft 4432 rotates through the second connecting hole 4421 , and the hole axes of the first connecting hole 4411 and the second connecting hole 4421 are both perpendicular to the axis of the mounting cylinder 32 .

In another embodiment of the present invention, as shown in FIGS. 1 to 4 , the nut tightening mechanism further includes a positioning assembly 50 for limiting the coaxial connection between the sleeve 10 and the transmission shaft 43 . The shaft is arranged and sleeved on the elastic positioning member 51 outside the transmission shaft 43, one end of the elastic positioning member 51 is connected with the transmission shaft 43, and the other end of the elastic positioning member 51 is connected with the sleeve 10 and elastically pushes the sleeve 10, so that the The axis of the sleeve 10 is kept coincident with the axis of the transmission shaft 43 . In this way, when the tightening operation is not performed, that is, the sleeve 10 is always kept coaxial with the transmission shaft 43 in the initial state, the position of the sleeve 10 can be used as the positioning reference when the nut tightening mechanism of this embodiment is assembled with other equipment. When the nut mechanism is used, it is used as a reference to move, so that the sleeve 10 can move to the designated position more quickly. In addition, when the sleeve 10 is rotatably connected with the transmission shaft 43 through the above-mentioned transmission connecting member 44, the sleeve 10 will shake during the movement process. The positioning member 51 elastically restrains the sleeve 10 so that it cannot shake, thereby facilitating the rapid and precise movement of the sleeve 10, so that the nesting portion 11 can quickly move to just above the nut.

Specifically, in this embodiment, as shown in FIGS. 2 to 4 , the elastic positioning member 51 is a spring sleeved on the outside of the transmission shaft 43 , and the positioning assembly 50 further includes a first spring fixing seat whose outline is adapted to the mounting cylinder 32 . 52 and the second spring fixing seat 53, the first spring fixing seat 52 is sleeved on the second end of the transmission shaft 43, the second spring fixing seat 53 is sleeved on the second end of the sleeve 10, The ends are respectively embedded in the first spring fixing seat 52 and the second spring fixing seat 53. When the transmission shaft 43 drives the first spring fixing seat 52 and the second spring fixing seat 53 to rise to a predetermined position, the first spring fixing seat 52 and the second spring fixing seat 53 are accommodated in the installation cylinder 32, and the outer wall surfaces of the first spring fixing seat 52 and the second spring fixing seat 53 are in contact with the inner wall surface of the installation cylinder 32 and can follow the cylinder wall of the installation cylinder 32. slide. In this way, when the first spring fixing seat 52 and the second spring fixing seat 53 are accommodated in the installation cylinder 32, the position where the sleeve 10 is located is the positioning reference position. In this way, the first spring fixing seat 52 and the second spring fixing seat 52 are provided. The fixing seat 53 locates and installs the elastic positioning member 51, and the disassembly and assembly of the elastic positioning member 51 is more convenient, and the first spring fixing seat 52 and the second spring fixing seat 53 can also assist the elastic positioning member 51. The co-action enables the sleeve 10 to be better kept coaxially with the drive shaft 43 in the initial state.

More specifically, when the nut tightening operation starts, the transmission shaft 43 moves toward the nut under the action of the external force, and at the same time the transmission shaft 43 moves, the first positioning member mounting seat 52 and the second positioning member mounting seat 53 together with the elastic positioning member 51 are moved together. The sleeve 10 can be rotated relative to the transmission shaft 43 again after being squeezed until it is released from the installation barrel 32 .

In another embodiment of the present invention, as shown in FIG. 1 and FIG. 2 , the rotary driving member 20 includes a drive motor 22 and a reducer 23 , the output shaft of the drive motor 22 is connected with the input shaft of the reducer 23 , and the output shaft of the reducer 23 is connected. The output shaft is connected to the rotating shaft of the drive gear 41 , the reducer 23 is fixedly mounted on the mounting plate 31 through the reducer fixing seat 2311 , and the drive gear 41 is accommodated in the reducer fixing seat 2311 . Among them, the reducer 23 can reduce the rotational speed of the driving motor 22 and increase the torque, so that the rotary driving member 20 can better set the driving output power to match the tightening torque required by the nut.

Specifically, in this embodiment, the drive motor 22 is preferably a servo motor. The servo motor has the characteristics of small electromechanical time constant and high linearity, and can convert the received electrical signal into precise angular displacement or angular velocity output. The accuracy can reach 0.001mm.

Another embodiment of the present invention also provides a nut-tightening device (not shown in the figure), which includes the above-mentioned nut-tightening mechanism.

The nut-tightening device of this embodiment uses the above-mentioned nut-tightening mechanism, which can realize the automatic operation of nut tightening, thereby effectively reducing the labor intensity of the operator and improving the work efficiency, and it can also control the rotating driving member 20 The size of the power output, so as to control the tightening torque applied to the nut. When the nut is tightened, the nut will not be damaged due to excessive torque, or the nut will not be tightened in place due to excessive torque. The tightened nut is not easy to loosen and tighten the connection. More stable and reliable.

In this embodiment, the nut screwing device also includes a drive mechanism for driving the transmission shaft 43 to reciprocate up and down along its own axis. The driving mechanism drives the transmission shaft 43 to move up and down in the mounting cylinder 32, thereby driving the sleeve 10 to move up and down to The nesting portion 11 is nested or disengaged from the nut.

The above descriptions are only 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 in the protection of the present invention. within the range.

Claims (10)

1. A nut tightening mechanism, characterized in that it comprises a mounting seat, a sleeve mounted on the mounting seat and used to fit a nested nut, and a rotary drive for driving the sleeve to rotate to provide tightening torque The end of the sleeve away from the mounting seat is provided with a nesting portion for fitting and nesting the nut, and the power output shaft of the rotary driving member is drivingly connected with the sleeve and used to drive the The sleeve rotates around its own axis so that the nested portion drives the nut to rotate and tightens the nut. 2 . The nut-tightening mechanism according to claim 1 , wherein the nut-tightening mechanism further comprises a transmission assembly comprising a driving gear, a driven gear and a transmission shaft, and the driving gear and the rotating The power output shaft of the driving member is connected, the driven gear is meshed with the driving gear, the transmission shaft and the sleeve both have opposite first and second ends, and the nesting portion is arranged on the The first end of the sleeve, the driven gear is sleeved on the first end of the transmission shaft, and the second end of the sleeve is connected with the second end of the transmission shaft. 3 . The nut-tightening mechanism according to claim 2 , wherein the mounting base comprises a mounting plate and a mounting cylinder, the rotary driving member is mounted on the mounting plate, the driving gear and the driven The gear is rotated and mounted on the mounting plate along the horizontal direction, and a connecting through hole is opened at the position of the mounting plate facing the driven gear, the mounting cylinder is fixed under the mounting plate, and the transmission shaft is Passing through the installation cylinder, the first end of the transmission shaft passes through the connecting through hole and is sleeved with the driven gear, and the first end of the sleeve is away from the installation cylinder. The end of the mounting plate protrudes, and the transmission shaft can reciprocate up and down in the mounting cylinder along its own axis direction under the action of external force, thereby driving the sleeve to reciprocate up and down to make the nesting portion nest or disengage the nut. 4. The nut tightening mechanism according to claim 3, wherein the transmission assembly further comprises a spline nut, a first bearing and a second bearing, the first bearing being embedded in the connecting through hole, The spline nut is sleeved on the first end of the transmission shaft, the spline nut and the transmission shaft form a ball spline, the spline nut passes through the first bearing and is connected with the first bearing. The inner ring of the bearing is fixed, one end of the spline nut protrudes from the mounting plate and is keyed to the driven gear, the second bearing is embedded in the mounting cylinder, and the The other end extends out of the connecting through hole and is fixed to the inner ring of the second bearing, so as to be rotatably connected to the mounting cylinder through the second bearing. 5 . The nut-tightening mechanism according to claim 2 , wherein the second end of the transmission shaft is connected with the second end of the sleeve through a transmission connection piece, and the transmission connection piece comprises a first connection head. 6 . , a second connecting head and a connecting section, the first connecting head is connected to the second end of the transmission shaft, the second connecting head is connected to the second end of the sleeve, and the second connecting head is The connecting link is rotatably connected with the first connecting head, so that the sleeve can rotate relative to the transmission shaft. 6 . The nut tightening mechanism according to claim 5 , wherein a first connecting shaft and a second connecting shaft which are arranged in a crisscross form protrude from the side wall of the connecting joint, and the first connecting head passes through the The first connecting shaft is rotatably connected with the connecting section, the second connecting head is rotatably connected with the connecting section through the second connecting shaft, and the first connecting head, the connecting section and the first connecting section are The two connectors together form a universal joint structure. 7. The nut tightening mechanism according to any one of claims 3 to 6, wherein the nut tightening mechanism further comprises a positioning assembly for limiting the coaxial connection between the sleeve and the transmission shaft, and the The positioning assembly includes an elastic positioning member coaxially arranged with the transmission shaft and sleeved outside the transmission shaft, one end of the elastic positioning member is connected to the transmission shaft, and the other end of the elastic positioning member is connected to the transmission shaft. The sleeve is connected and elastically pushes against the sleeve, so that the axis of the sleeve and the axis of the transmission shaft are kept coincident. 8 . The nut tightening mechanism according to claim 7 , wherein the elastic positioning member is a spring sleeved on the outside of the transmission shaft, and the positioning assembly further comprises a nut whose outline is adapted to the installation cylinder. 9 . a first spring fixing seat and a second spring fixing seat, the first spring fixing seat is sleeved on the second end of the transmission shaft, the second spring fixing seat is sleeved on the second end of the sleeve, The two ends of the spring are respectively embedded in the first spring fixing seat and the second spring fixing seat, and the transmission shaft drives the first spring fixing seat and the second spring fixing seat to rise to In a predetermined position, both the first spring fixing seat and the second spring fixing seat are accommodated in the installation cylinder. 9. The nut tightening mechanism according to any one of claims 2 to 6, wherein the rotary driving member comprises a drive motor and a reducer, and the output shaft of the drive motor is connected to the input shaft of the reducer , the output shaft of the reducer is connected with the rotating shaft of the drive gear, the reducer is mounted on the mounting plate through the reducer fixing seat, and the drive gear is accommodated in the reducer fixing seat. 10. A nut tightening device, characterized in that it comprises the nut tightening mechanism according to any one of claims 1 to 9.

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