CN219310615U - Guiding mechanism - Google Patents

Abstract

The utility model discloses a guide mechanism which comprises a plurality of supports arranged around an assembly axis, wherein guide arms are rotatably connected to the supports, guide pieces are arranged on the guide arms, connecting lines at two ends of the guide arms are parallel to the assembly axis, and when the guide pieces are contacted with the surface of a workpiece, the axis of the workpiece is collinear with the assembly axis. According to the guide mechanism disclosed by the utility model, the guide arm capable of rotating on the support is arranged, and the guide piece capable of contacting with the workpiece is arranged on the guide arm, such as the upper and lower adjusting blocks or the idler wheels arranged at the upper end and the lower end of the guide arm, when the guide arm moves to be parallel to the assembly axis of the workpiece with the connecting lines of the two ends of the guide arm, the guide piece on the guide arm contacts with the workpiece, so that the workpiece is clamped, and the workpiece can only move along the assembly axis direction due to the radial acting force of the guide piece, so that the accurate installation of the workpiece is ensured.

Description

Guiding mechanism

Technical Field

The utility model belongs to equipment assembly auxiliary tools, and relates to a guide mechanism.

Background

Devices such as large cylinders that primarily move linearly are widely used in the field of industrial production, mechanical equipment, building assembly, etc., and these devices typically have a workpiece that moves linearly, such as a piston rod on the large cylinder. When producing these devices or maintaining these devices that have been in use, it is generally necessary to assemble the workpiece to the device main body, because the workpiece of a large-scale oil cylinder or other device generally has a large inertia, the workpiece is difficult to be installed in centering, the workpiece is easy to be aligned with the axis of the mounting hole in the device main body during the installation process, even the axis of the workpiece is not parallel to the axis of the mounting hole, in addition, the operation of these devices is powered by hydraulic pressure or pneumatic pressure, etc., and the seal is installed on the contact surface of the workpiece and the device main body, that is, the contact surface of the workpiece and the mounting hole, the problem that the workpiece and the assembly axis are not collinear and not parallel during the installation of the workpiece is very easy to cause the sealing element to be blocked during the installation process of the workpiece.

Disclosure of Invention

The utility model aims to provide a guide mechanism which solves the problems that the prior workpiece is difficult to mount in a centering way during mounting and axial different lines are easy to appear during the mounting process.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a guiding mechanism, includes a plurality of supports of arranging around the assembly axis, all rotate on the support and be connected with the guide arm, be provided with the guide on the guide arm, the link at guide arm both ends is on a parallel with the assembly axis just when the guide contacts with the work piece, work piece axis and assembly axis collinearly.

Optionally, the guide piece comprises an upper adjusting block and a lower adjusting block, and the upper adjusting block and the lower adjusting block are respectively connected with two ends of the guide arm in a rotating way.

Optionally, the guide piece comprises two rollers, and the two rollers are respectively connected to two ends of the guide arm in a rotating way.

Optionally, cambered grooves are formed on one side of the upper adjusting block and one side of the lower adjusting block, which face the workpiece.

Optionally, the guiding arm includes a top edge rod and a bottom edge rod connected to a lower portion of the top edge rod, and the top edge rod and the bottom edge rod form an included angle.

Optionally, the angle of the included angle formed by the upper side rod and the lower side rod is adjustable, and the lower side rod is rotatably connected to the upper side rod.

Optionally, a plurality of limiting holes are formed on the upper side rod, a limiting arm is rotatably connected on the lower side rod, and a protruding portion matched with the limiting hole is formed on the limiting arm.

Optionally, a platform plate is arranged on the support, a slideway extending along the radial direction is formed on the platform plate, a sliding block is connected in the slideway in a sliding way, and the guide arm is connected on the sliding block in a rotating way.

Optionally, a spring is arranged in the slideway, one end of the spring is connected to the sliding block, and the other end of the spring is connected to the end part of the slideway.

Optionally, the support is equiangularly disposed about the mounting axis.

Optionally, the device further comprises an integral base, and a plurality of the supports are detachably connected to the integral base.

Optionally, the device further comprises a plurality of independent bases, and a plurality of the supports are respectively detachably connected to the independent bases.

The beneficial effects of the utility model include:

1. by installing the guide mechanism disclosed by the utility model around the installation hole on the equipment, the rod-shaped or columnar workpiece is limited and guided by the guide piece on the guide mechanism in the installation process, the axis of the workpiece is collinear with the assembly axis, the workpiece can be accurately installed in the installation hole, the workpiece is prevented from being deviated or inclined in the process of being assembled in the installation hole, and the accuracy and the installation efficiency of workpiece installation are improved.

2. According to the self-using guide mechanism disclosed by the utility model, the guide arm capable of rotating on the support is arranged, the upper adjusting block and the lower adjusting block or the idler wheels capable of rotating along the moving direction of the workpiece are respectively arranged at the top and the bottom of the guide arm, and the guide of the workpiece movement and the adjustment of the posture of the workpiece are realized through the clamping of the guide parts such as the upper adjusting block and the lower adjusting block or the idler wheels, so that the accurate installation of the workpiece is ensured. Meanwhile, as the support and the base are fixed, the upper adjusting block and the lower adjusting block can ensure contact with the surface of the workpiece, and the guiding function on the workpiece is ensured.

Drawings

Fig. 1 is a schematic isometric view of a first exemplary guide mechanism of the present disclosure.

Fig. 2 is an isometric view of an integral base of a second embodiment of the disclosed guide mechanism.

Fig. 3 is an isometric view of a guide arm with an adjustable included angle in a third embodiment of the disclosed guide mechanism.

Fig. 4 is a schematic front view of a fourth embodiment of the disclosed guide mechanism.

Fig. 5 is a schematic side view of a fourth embodiment of the disclosed guide mechanism.

Fig. 6 is a schematic top view of a fourth embodiment of the disclosed guide mechanism.

Fig. 7 is a schematic view of a fifth embodiment of a guide mechanism according to the present utility model, in which two ends of a guide arm are connected to rollers.

In the figure: 1. a workpiece; 2. an independent base; 3. supporting; 4. a guide arm; 5. an upper adjusting block; 6. a lower adjusting block; 7. a waist-shaped hole; 8. a top edge bar; 9. a lower edge bar; 10. a limiting arm; 11. a limiting hole; 12. an integral base; 13. a platform plate; 14. a slideway; 15. a slide block; 16. a spring; 17. and a roller.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

Many large-scale apparatuses are currently equipped with work pieces 1 that perform linear movement, and these work pieces 1 are usually rod-shaped members such as piston rods of large-scale cylinders. During the production, assembly and maintenance of these large-scale apparatuses, the step of mounting the work 1, which performs linear movement, to these apparatuses is included, and these work 1 are usually mounted in mounting holes provided in the apparatus main body, in which the work 1 can be moved in the axial direction of the mounting holes. When the workpiece 1 is installed, the workpiece 1 is required to be aligned with the installation hole, collision between the workpiece 1 and the equipment main body is avoided, but for the rod-shaped workpiece 1 with larger size and weight, the workpiece 1 and the installation hole are difficult to keep aligned all the time in the installation process, so that the posture of the workpiece 1 needs to be repeatedly adjusted before the workpiece 1 is inserted into the installation hole, and the installation efficiency of the workpiece 1 is lower.

In other large-scale apparatuses, a plurality of rod-shaped workpieces 1 are butted together in an end-to-end manner, and when two workpieces 1 are butted, the ends of the two workpieces 1 need to be aligned, that is, when the two workpieces 1 are butted, the axis of the two workpieces 1 needs to be collinear, so that the accurate butting of the two workpieces 1 is ensured. During the docking process, there is also a great difficulty in keeping the axes of the two workpieces 1 to be docked aligned at all times.

Therefore, in order to improve the installation efficiency of the workpiece 1 or the abutting efficiency of two workpieces 1 on the large-scale equipment, a guiding tool is required to guide the movement of the workpiece 1 so as to improve the installation or abutting accuracy of the workpiece 1.

For convenience of description, the axis to be aligned when the workpieces 1 are assembled is hereinafter referred to as an assembly axis, that is, an axis of the mounting hole or a docking axis to be aligned when the two workpieces 1 are docked. The axial direction is the direction extending along the assembly axis, and the radial direction is the direction perpendicular to the assembly axis.

The utility model provides a guide mechanism which is used for guiding a workpiece 1 when the workpiece 1 is assembled, and improves the installation efficiency of the workpiece 1.

The guide mechanism disclosed by the utility model is described below by taking an assembly process of a piston rod of a large-sized oil cylinder as an example.

First embodiment:

as shown in fig. 1, a guide mechanism includes three independent bases 2 independent of each other, and a guide unit that contacts a workpiece 1 and guides the workpiece 1 is provided on each independent base 2. When the guide unit is used, the three independent bases 2 are arranged around the orifice of the mounting hole, the mounting hole is enclosed between the three independent bases 2, and the distances between the guide units on the independent bases 2 and the assembly axis are equal. The piston rod of the oil cylinder firstly extends into the middle of the three guide units, then the guide units are contacted with the outer surface of the workpiece 1, radial acting force is applied to the workpiece 1, and the axis of the workpiece 1 and the assembly axis are collinear, so that the workpiece 1 can be directly inserted into the mounting hole.

The three individual bases 2 are identical in shape. The individual bases 2 are plate-like members having top and bottom surfaces extending along a horizontal plane. In this embodiment, two bolt holes are formed in the independent base 2, the independent base 2 is fixed around the mounting hole by mounting bolts in the bolt holes, and the fixed base enables a guide unit mounted thereon to provide radial acting force to the workpiece 1, so that the workpiece 1 can be accurately assembled. The independent base 2 is also provided with a waist-shaped hole 7 for installing a guide unit, and the guide unit is also installed in the waist-shaped hole 7 through a bolt.

The guide unit comprises a support 3 and a guide arm 4 connected to the support 3, and the support 3 is detachably mounted on the top surface of the independent base 2. The guide arms 4 are provided with guide pieces which are contacted with the workpiece 1, and when the guide pieces on the three guide arms 4 are contacted with the surface of the workpiece 1, the connecting lines of the two ends of the guide arms 4 are parallel to the assembly axis, and at the moment, the axis of the workpiece 1 is collinear with the assembly axis.

Specifically, the support 3 is a columnar member extending in a direction parallel to the fitting axis. The independent base 2 is provided with a waist-shaped hole 7, the length direction of which always coincides with the radial direction, and the support 3 is fixedly connected in the waist-shaped hole 7, so that the distance between the support 3 and the assembly axis can be adjusted by adjusting the position of the support 3 in the waist-shaped hole 7.

When the guide mechanism is installed, the relative positions between the independent bases 2 and the installation holes are firstly determined, the distances between the three independent bases 2 and the assembly axis are ensured to be approximately equal, then the supports 3 are connected to the independent bases 2, and the distances between the supports 3 and the assembly axis can be adjusted in the process of installing the supports 3, so that the distances between the three supports 3 and the assembly axis are kept consistent. Since the distance between the support 3 and the assembly axis can be controlled by adjusting the position of the support 3 in the waist-shaped hole 7, a larger deviation is allowed when the independent base 2 is installed, the convenience of the installation of the independent base 2 is improved, and the use efficiency of the whole guide mechanism is improved.

In alternative embodiments, the support 3 may be a member of other shapes, such as a triangular bracket or a triangular support 3 plate or other shape that provides a stable support 3 and radial force.

A U-shaped notch is formed at the top of the support 3, and the guide arm 4 is rotatably connected in the U-shaped notch formed at the top of the support 3. Two ends of the first pin shaft are fixedly connected with two opposite side walls of the U-shaped notch respectively. The middle part of the guide arm 4 is provided with a first pin hole, and the first pin shaft is inserted into the first pin hole of the guide arm 4, so that the guide arm 4 can rotate around the first pin shaft, namely, the guide arm 4 can rotate at the top of the support 3. It will be appreciated that the guide arm 4 may also be rotatably connected to the top of the support 3 in other ways.

An upper adjusting block 5 and a lower adjusting block 6 which can be contacted with the surface of the workpiece 1 are respectively connected with the upper end and the lower end of the guide arm 4 in a rotating way, and the distance from the contact surface of the upper adjusting block 5 and the lower adjusting block 6 with the workpiece 1 to the assembly axis is equal to the radius of the workpiece 1. When the workpiece 1 extends into the space between the three upper adjusting blocks 5 and the lower adjusting block 6, the lower adjusting block 6 and the upper adjusting block 5 sequentially contact the surface of the workpiece 1, and finally the lower adjusting block 6 and the upper adjusting block 5 act on the surface of the workpiece 1 at the same time to clamp the workpiece 1. Because of the distance between the upper adjusting block 5 and the lower adjusting block 6 and the assembly axis, the axis of the workpiece 1 is collinear with the assembly axis, so that the guiding and limiting of the workpiece 1 can be realized, and the workpiece 1 can only move along the assembly axis.

Specifically, the top and bottom of the guide arm 4 are both formed with U-shaped grooves, and the U-shaped grooves at the two ends of the guide arm 4 are also provided with second pin shafts with the two ends respectively connected to the inner walls at the two sides of the U-shaped groove. The side wall of one side of the upper adjusting block 5 and the lower adjusting block 6 far away from the workpiece 1 is provided with a protruding part, a connecting through hole is formed in the protruding part, the second pin shaft can be inserted into the connecting through hole, the upper adjusting block 5 and the lower adjusting block 6 can rotate around the second pin shaft, namely, the upper adjusting block 5 can rotate at the top of the guide arm 4, and the lower adjusting block 6 can rotate at the bottom of the guide arm 4. It will be appreciated that the upper and lower adjustment blocks 5, 4 are not limited to the above-described connection to the guide arm 4, and that other connection means may be used to effect rotation of the upper and lower adjustment blocks 5, 6 on the guide arm 4.

The upper adjusting block 5 and the lower adjusting block 6 are guiding pieces on the guiding arm 4.

The side surfaces of the upper adjusting block 5 and the lower adjusting block 6, which are in contact with the workpiece 1, are provided with cambered surface grooves which can be attached to the surface of the workpiece 1, and the workpiece 1 can slide along the cambered surface grooves. The arrangement of the cambered surface groove can enable the adjusting block to have larger contact area with the surface of the workpiece 1, and the upper adjusting block 5 and the lower adjusting block 6 can better clamp the workpiece 1, so that better guiding and radial limiting effects are realized. The larger contact surface can also reduce the pressure intensity at the contact position of the regulating block and the workpiece 1, so that abrasion and scratch on the surface of the workpiece 1 are avoided, and the use of the workpiece 1 is prevented from being influenced.

Because the guide arm 4 is rotationally connected to the top of the support 3, when the upper adjusting block 5 moves towards the direction close to the assembly axis, the lower adjusting block 6 moves towards the direction far away from the assembly axis synchronously, so that the position of the lower adjusting block 6 relative to the workpiece 1 can be adjusted only, the lower adjusting block 6 and the upper adjusting block 5 are contacted with the surface of the workpiece 1 at the same time, and the guiding and limiting of the workpiece 1 are realized. Therefore, when in use, the distance from the upper adjusting block 5 to the assembly axis is larger than the radius length of the workpiece 1, so that the workpiece 1 does not need to be in a particularly accurate axis position when entering the area enclosed between the three guide arms 4, and the use flexibility and the usability of the guide mechanism are improved.

In this embodiment, the guide arm 4 includes two angled side bars, the bottom of the upper side bar 8 is connected to the top of the lower side bar 9, and the upper side bar 8 and the lower side bar 9 form an included angle, in other words, the guide arm 4 is a V-shaped member having an included angle. The apex angle of guide arm 4 rotates with the first round pin axle at support 3 top to be connected, and upper adjusting block 5 rotates the top of connecting at the upper edge pole, and lower adjusting block 6 rotates the bottom of connecting at the lower edge pole, and the lower part of upper edge pole is connected with the upper portion of lower edge pole. The guide arm 4 with an included angle can rotate on the support 3 for a larger angle, so that the guide arm is more flexible and easy to adjust in use. From the view of limiting effect on the workpiece 1, the two ends of the guide arm 4 with the included angle can provide larger radial acting force for the workpiece 1, meanwhile, the moment effect on the end part of the guide arm 4 is smaller, the deformation of the guide arm 4 caused by the moment effect is reduced, and the long-term use of the guide arm 4 is facilitated.

Specifically, the angle of the guide arm 4 is not more than 180 degrees. Preferably, the included angle of the guiding arm 4 is 60 degrees to 150 degrees.

When in use, the distance between the contact surface of the lower adjusting blocks 6 on the three guide arms 4 and the workpiece 1 and the assembly axis is smaller than the radius of the workpiece 1, and the distance between the upper adjusting blocks 5 and the assembly axis is larger than the radius of the workpiece 1. When the workpiece 1 is installed, the workpiece 1 firstly stretches into the space between the three guide arms 4, the lower part of the workpiece 1 firstly contacts with the lower adjusting blocks 6 to push the three lower adjusting blocks 6 to move in the directions away from each other, meanwhile, the three upper adjusting blocks 5 are close to each other, when the three lower adjusting blocks 6 are attached to the workpiece 1, the three upper adjusting blocks 5 are attached to the workpiece 1, the connecting lines of the two ends of the guide arms 4 are parallel to the assembly axis at the moment, the guide arms 4 cannot rotate due to the limitation of the workpiece 1 on the guide arms 4, the workpiece 1 is clamped by the surrounding guide arms 4 and cannot move radially, and the axis of the workpiece 1 and the assembly axis are in heavy collineation and can move along the assembly axis.

The work 1 is a rod-shaped member that moves linearly.

The working flow is as follows: the base is firstly arranged on the surface of the oil cylinder through bolts, and the position of the base on the oil cylinder is determined before the base is arranged, so that the distances from the three bases to the assembly axis are approximately equal after the base is arranged. The support 3 is then mounted on the top surface of the base, the guide arms 4 are connected to the support 3, and the position of the support 3 on the base is adjusted to ensure that the distances between the upper adjusting blocks 5 and the lower adjusting blocks 6 of the three guide arms 4 and the assembly axis are consistent.

When the workpiece 1 is mounted, the guide arms 4 are first opened upwards so that the distance between the three lower adjusting blocks 6 is smaller than the diameter of the workpiece 1, and the distance between the three upper adjusting blocks 5 and the mounting axis is larger than the diameter of the workpiece 1, so that the workpiece 1 can easily extend into the area between the three guide arms 4. In the process of moving the workpiece 1 towards the direction of the mounting hole, the workpiece 1 firstly enters the area between the three upper adjusting blocks 5, then moves towards the direction of the lower adjusting blocks 6, when the workpiece 1 moves downwards to the position above the lower adjusting blocks 6, the workpiece 1 can enter the position between the three lower adjusting blocks 6 by manual assistance, after the position of the bottom end face of the workpiece 1 is lower than the upper surface of the lower adjusting blocks 6, the lower adjusting blocks 6 gradually and completely attach to the surface of the workpiece 1 in the process of moving the workpiece 1 downwards, in the process, the upper adjusting blocks 5 attach to the surface of the workpiece 1, at the moment, the connecting lines of the two ends of the guide arms 4 are parallel to the assembly axis, and finally the upper adjusting blocks 5 and the lower adjusting blocks 6 stably clamp the workpiece 1, at the moment, the workpiece 1 can only move in the direction limited by the upper adjusting blocks 5 and the lower adjusting blocks 6, and the guiding of the workpiece 1 is realized.

In other embodiments, the guide mechanism of the present utility model may have only two opposite guide units, or may have more than three guide units according to needs, and the guide units may be disposed around the mounting hole when in use. Preferably, a plurality of supports 3 are arranged at equal angles around the mounting hole.

Second embodiment:

the difference from the first embodiment is that the base in the second embodiment is an integral base 12, i.e. three guiding units are all mounted on one integral base 12.

Fig. 2 shows the structure of the integral base 12 according to the second embodiment of the present utility model.

The integral base 12 is a circular plate-shaped member, wherein a guide through hole with a diameter larger than that of the mounting hole is formed in the middle of the integral base 12, and when the integral base 12 is mounted, the axis of the guide through hole and the assembly axis of the integral base 12 are ensured to be approximately collinear, so that the distance between the support 3 on the integral base 12 and the assembly axis is ensured to be approximately accurate. Three projections are formed on the integral base 12, the three projections being equiangularly distributed on the periphery of the integral base 12. The protruding parts are all provided with waist-shaped holes 7, the supports 3 are arranged in the waist-shaped holes 7, and the distance between the supports 3 and the assembly axis can be adjusted by adjusting the positions of the supports 3 in the waist-shaped holes 7.

The integral base 12 is also formed with a plurality of bolt holes distributed around the guide through holes, through which the integral base 12 is secured to the surface of the apparatus or other foundation that provides a firm support 3.

The integral base 12 in the present embodiment only needs to ensure the accuracy of the position of the integral base 12 when in use, but a plurality of independent bases 2 are usually required when in use, and the accuracy of the installation of each independent base 2 needs to be ensured when in installation, so the installation workload of using the independent bases 2 is larger than that of the integral base 12. The stand-alone base 2 is more suitable for use on rough-surfaced equipment than the integral base 12, and the integral base 12 is more suitable for use on flat-surfaced equipment.

Third embodiment:

the difference from the first two embodiments is that the angle of the guide arm 4 formed by the two side bars in the third embodiment is adjustable.

As shown in fig. 3, the angle of the guide arm 4 formed by the two side bars is adjustable. The guide arm 4 comprises an upper side rod 8 and a lower side rod 9, the lower part of the upper side rod 8 is rotationally connected with the upper part of the lower side rod 9, and the change of the included angle of the guide arm 4 is realized by rotating the lower side rod 9.

Specifically, the lower part of the upper side rod 8 is provided with a second pin hole, the upper part of the lower side rod 9 is provided with a third pin hole matched with the second pin hole, when the lower side rod 9 is connected with the upper side rod 8, the third pin hole is aligned with the second pin hole, a third pin shaft is inserted into the two pin holes, and the upper side rod 8 and the lower side rod 9 can rotate around the third pin shaft, so that the angle of an included angle formed by the upper side rod 8 and the lower side rod 9 can be adjusted.

Further, in order to achieve guiding and limiting of the workpiece 1, after the guiding arm 4 is adjusted to a proper included angle, the included angle of the guiding arm 4 needs to be kept unchanged, so that an angle limiting is further arranged on the guiding arm 4.

Specifically, the angle limit includes a limit arm 10 rotatably connected to one side of the lower side lever 9. The lower part of the limiting arm 10 is fixedly connected with a fourth pin shaft, a fourth pin hole is formed in the lower side rod 9, the diameter of the fourth pin hole is larger than that of the fourth pin shaft, and the limiting arm 10 can rotate on the lower side rod 9 after the fourth pin shaft is inserted into the fourth pin hole.

The upper part of one side of the limit arm 10 facing the lower side rod 9 is provided with a protruding part, and one side of the upper side rod 8 facing the limit arm 10 is provided with a plurality of equidistant limit holes 11, and the limit holes 11 are matched with the protruding parts of the limit arm 10. After the included angle of the guide arm 4 is adjusted, the limiting arm 10 is rotated to enable the protruding portion of the limiting arm 10 to be inserted into the corresponding limiting hole 11, and the included angle of the guide arm 4 cannot be further adjusted due to the blocking of the limiting arm 10, so that the angle of the guide arm 4 is locked.

The angle of the guide arm 4 is adjustable, so that the whole guide mechanism has better use flexibility in the direction perpendicular to the assembly axis, and the included angle of the guide arm 4 can be flexibly adjusted according to the length of the workpiece 1 and the guide effect on the workpiece 1.

Fourth embodiment:

in the first three embodiments, the guide arm 4 cannot rotate when the guides on the guide arm 4 are all in contact with the surface of the workpiece 1, and although the first three embodiments are all suitable for guiding a single diameter workpiece 1, they are not suitable for guiding a rod-shaped workpiece 1 of variable cross section. When the workpiece 1 with the upper part thick and the lower part thin is guided, the guide piece of the guide arm 4 is firstly contacted with the lower part of the workpiece 1, so that the axis of the workpiece 1 is aligned with the assembly axis, but when the upper large-diameter section of the workpiece 1 starts to be contacted with the guide arm 4, the upper guide piece of the guide arm 4 is pushed by the large-diameter section of the workpiece 1 to rotate in a direction away from the workpiece 1, and the guide arm 4 cannot rotate because the lower guide piece of the guide arm 4 is attached to the surface of the small-diameter section of the workpiece 1, the large-diameter section of the workpiece 1 is blocked by the guide piece on the guide arm 4 at the moment, so that the workpiece 1 cannot move further along the assembly axis. Therefore, the guide mechanism in the first embodiment does not satisfy the guide requirement of the variable cross-section bar member well.

As shown in fig. 4-6, in order to meet the guiding requirement of the variable-section workpiece 1, a platform plate 13 extending along the horizontal direction is fixedly connected to the top of the support 3, a radial through hole extending along the radial direction is formed on the platform plate 13, that is, a slide way 14 shown in fig. 6 is formed on the platform plate 13, a slide block 15 is connected in the slide way 14 in a sliding manner, sliding grooves are formed on two side walls of the slide way 14 along the length direction, and two ends of the slide block 15 are respectively clamped into the sliding grooves of the side walls of the slide way 14. The width of the sliding groove is slightly larger than the thickness of the two ends of the sliding block 15, the two ends of the sliding block 15 can move in the sliding way 14 in the radial direction, but the two ends of the sliding block 15 cannot rotate in the sliding groove due to the limitation of the sliding groove on the two ends of the sliding block 15, and the sliding block 15 can move in the radial direction only when the connecting line of the two ends of the guide arm 4 is parallel to the assembly axis. The apex angle of the angled guide arm 4 is rotatably connected to the slide 15, so that the guide arm 4 can also move radially in the slide 14. Further, a spring 16 is further arranged in the slideway 14, one end of the spring 16 is fixedly connected with a sliding block 15, and the other end of the spring 16 is fixedly connected with the end of the slideway 14 far away from the workpiece 1. After the spring 16 is compressed due to the fact that the sliding block 15 is pushed by external force, the spring 16 pushes the sliding block 15 to reset after the external force applied to the sliding block 15 disappears; when the spring 16 is relaxed, the slider 15 is in the default position.

When the guide members of the guide arm 4 are in close contact with the workpiece 1, the workpiece 1 can move along the direction defined by the guide members of the guide arm 4, and when the part of the workpiece 1 with larger diameter is in contact with the guide members of the guide arm 4, the connecting lines of the upper end and the lower end of the guide arm 4 are parallel to the assembly axis, that is, the guide members of the guide arm 4 are simultaneously in contact with the surface of the workpiece 1, so that the diameter change of the workpiece 1 can not rotate the guide arm 4, only the guide arm 4 can be pushed to slide in the slideway 14, and the large-diameter section of the workpiece 1 has the guiding effect.

Fifth embodiment:

as shown in fig. 7, the difference from the first embodiment is that one roller 17 is rotatably connected to each end of the guide arm 4, that is, two rollers 17 are guides on the guide arm 4 that contact the workpiece 1. The rollers 17 on the guide arms 4 roll along the direction of the assembly axis, and when the connecting lines of the two ends of the guide arms 4 are parallel to the assembly axis, the rollers 17 on the guide arms 4 are contacted with the surface of the workpiece 1, and the workpiece 1 can only move along the direction of the assembly axis. When the workpiece 1 moves, the roller 17 rolls on the surface of the workpiece 1, the roller 17 can reduce the friction force on the surface of the workpiece 1 while ensuring the guiding function on the workpiece 1, so that the workpiece 1 can be pushed to move along the direction of the assembly axis by using smaller axial acting force, the rolling of the roller 17 on the surface of the workpiece 1 can also obviously reduce the surface abrasion of the workpiece 1, and the guiding mechanism can also have longer service life.

The term "plurality" as used herein includes two or more.

The foregoing description of the embodiments is provided to facilitate the understanding and appreciation of the utility model by those skilled in the art. It will be apparent to those skilled in the art that various modifications can be made to these teachings and that the general principles described herein may be applied to other embodiments without the need for inventive faculty. The utility model is not limited to the above description of the embodiments and the description of the embodiments, and those skilled in the art, based on the disclosure of the utility model, should make improvements and modifications without departing from the scope of the utility model.

Claims (12)

1. A guide mechanism comprising a plurality of supports arranged about an assembly axis, characterized in that: the support is rotatably connected with a guide arm, the guide arm is provided with a guide piece, the connecting lines at two ends of the guide arm are parallel to the assembly axis, and when the guide piece is contacted with a workpiece, the axis of the workpiece is collinear with the assembly axis.

2. The guide mechanism according to claim 1, wherein: the guide piece comprises an upper adjusting block and a lower adjusting block, and the upper adjusting block and the lower adjusting block are respectively connected with two ends of the guide arm in a rotating mode.

3. The guide mechanism according to claim 1, wherein: the guide piece comprises two rollers, and the two rollers are respectively connected to the two ends of the guide arm in a rotating mode.

4. The guide mechanism according to claim 2, wherein: and cambered grooves are formed on one sides of the upper adjusting block and the lower adjusting block, which face the workpiece.

5. A guide mechanism according to any one of claims 1-3, wherein: the guide arm comprises an upper side rod and a lower side rod connected to the lower portion of the upper side rod, and an included angle is formed between the upper side rod and the lower side rod.

6. The guide mechanism according to claim 5, wherein: the angle of the included angle formed by the upper side rod and the lower side rod is adjustable, and the lower side rod is rotatably connected to the upper side rod.

7. The guide mechanism of claim 6, wherein: the upper side rod is provided with a plurality of limiting holes, the lower side rod is rotatably connected with a limiting arm, and the limiting arm is provided with a protruding part matched with the limiting holes.

8. The guide mechanism according to claim 1, wherein: the support is provided with a platform plate, a slide rail extending along the radial direction is formed on the platform plate, a sliding block is connected in a sliding manner in the slide rail, and the guide arm is connected to the sliding block in a rotating manner.

9. The guide mechanism of claim 8, wherein: the sliding rail is characterized in that a spring is arranged in the sliding rail, one end of the spring is connected to the sliding block, and the other end of the spring is connected to the end portion of the sliding rail.

10. The guide mechanism according to any one of claims 1 or 8-9, wherein: the supports are equiangularly arranged around the mounting axis.

11. The guide mechanism of claim 10, wherein: the support is detachably connected to the integral base.

12. The guide mechanism of claim 10, wherein: the support is detachably connected to the independent bases respectively.

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