CN221313302U - Self-centering clamping mechanism for rotary bar - Google Patents

Abstract

The utility model relates to the field of self-centering clamping tools, in particular to a self-centering clamping mechanism for a rotary bar, which comprises a first clamping arm group, a second clamping arm group, a first connecting rod, a second connecting rod, a driving arm assembly, a hydraulic cylinder, a rear box body, a front box body and a clamping arm connecting shaft, wherein the hydraulic cylinder is arranged at the bottom of the outer side of the rear box body and is locked and arranged with the rear box body through a locking nut, the driving arm assembly is arranged at the top part of a hydraulic rod and is fixedly connected with the top part of the hydraulic rod, and the clamping arm connecting shaft is symmetrically arranged at the inner side of the upper part of the rear box body.

Description

Self-centering clamping mechanism for rotary bar

Technical Field

The utility model relates to the field of self-centering clamping tools, in particular to a self-centering clamping mechanism for a rotary bar.

Background

The self-centering clamping mechanism is a mechanical clamping mechanism for simultaneously realizing centering positioning and quick clamping of bars, and in the clamping process of the bars, the influence of inaccuracy in positioning manufacture or positioning size deviation on centering is eliminated by utilizing constant-speed movement or uniform elastic deformation of the positioning clamping mechanism, so that the errors or the deviations can be uniformly and symmetrically distributed on a positioning reference surface of a workpiece, and the self-centering clamping mechanism is widely applied to various mechanical processing machine tool equipment at present, but the self-centering clamping mechanism in the prior art still has the following technical problems when centering and clamping the bars:

1. The existing self-centering clamping device has low clamping precision and insufficient clamping force, and is difficult to perform centering processing on a metal bar with a large length-diameter ratio, a large diameter or a large length (such as a self-centering clamping structure of a rod-shaped workpiece with a patent number of CN 202123338753.8);

2. the existing self-centering clamping device has the defects of very complex structure, larger volume, high production cost and insufficient usability (such as a self-centering clamp for a numerical control machining center with the patent number of CN 202022004923.8).

Disclosure of utility model

The utility model aims to provide a self-centering clamping mechanism for a rotary bar, which has the advantages of simple and convenient overall structure composition, small structure volume, low production and processing cost, good self-adaption to bars with different diameters, high clamping force and high clamping precision, and greatly meets the clamping use requirements of enterprises on bar parts.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The utility model provides a rotatory rod is from centering clamping mechanism, includes, first clamp arm group, second clamp arm group, first connecting rod, second connecting rod, the arm piece that closes, pneumatic cylinder, back box, preceding box and clamp arm connecting axle, the pneumatic cylinder install in back box outside bottom and install through lock nut and back box locking together, install the hydraulic stem on the pneumatic cylinder, the arm piece that closes install in hydraulic stem top position and link to each other with the fastening of hydraulic stem top, the upper portion inboard symmetry at back box install the clamp arm connecting axle, first clamp arm group, second clamp arm group install on clamp arm connecting axle and with clamp arm connecting axle articulated, articulated have first connecting rod and second connecting rod on the arm piece that closes, the arm piece that closes links to each other and drives first clamp arm group through first connecting rod and the clamp arm group and realize the clamp action, the arm piece that closes and link to each other and drive second clamp arm group through the second connecting rod and realize the clamp action, preceding box lid close and link to each other with the back box through the fastening bolt that installs after with the fastening.

The first clamping arm group and the second clamping arm group are identical in structure, the first clamping arm group and the second clamping arm group comprise a clamping arm main body, clamping rollers and a rotary shaft pin, an open slot is formed in the upper portion of the clamping arm main body, an installation shaft used for installing the clamping rollers is installed in the open slot, the clamping rollers are installed on the installation shaft through bearings, the rotary shaft pin is installed on the side face of the clamping arm main body, the rotary shaft pin and the clamping arm main body are fixedly connected into a whole, strip-shaped clamping slots are formed in the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod are clamped on the rotary shaft pin through the clamping slots.

The driving arm assembly comprises a horizontal driving arm, a vertical driving arm, driving arm idler wheels A and driving arm idler wheels B, wherein the bottom of the horizontal driving arm is installed at the top of a hydraulic rod and is connected with the top of the hydraulic rod, the vertical driving arm is installed on the upper portion of the horizontal driving arm and is connected with the vertical stationary phase of the horizontal driving arm, side open slots are formed in two sides of the horizontal driving arm, driving arm idler wheels A which are used for driving a clamping arm main body to rotate inwards around a clamping arm connecting shaft are installed in the side open slots, top open slots are formed in the top of the vertical driving arm, and driving arm idler wheels B which are used for supporting and clamping the bottom of a workpiece are installed in the top open slots.

Further, a limiting block for limiting the upper limit of the horizontal driving arm is arranged on the upper portion of the inner side of the rear box body, and the limiting block is fixedly connected with the inner side wall of the rear box body into a whole.

Further, a limit rod is fixedly arranged at the bottom of the horizontal driving arm, threads are machined on the limit rod, a limit nut is arranged on the limit rod, the limit nut is connected with the limit rod through threaded fit, once the hydraulic cylinder moves excessively, the limit nut collides with the bottom of the rear box body, the driving arm assembly is prevented from continuing to descend, and excessive opening of the clamping arm is avoided.

Further, a through hole for adapting the stop lever to penetrate is formed in the bottom of the rear box body, and the aperture of the through hole is larger than the outer diameter of the stop lever and smaller than the outer diameter of the stop nut.

Furthermore, two groups of limiting rods are symmetrically arranged at the bottom of the horizontal driving arm.

Further, two groups of limiting blocks for limiting the upper limit of the horizontal driving arm are symmetrically arranged on the upper part of the inner side of the rear box body.

Further, a pressure sensor is arranged on the hydraulic cylinder, when the driving arm roller B contacts the surface of the bar, after the bar is clamped, the pressure sensor can send a signal to an electric control system, so that certain pressure in the hydraulic cylinder is kept unchanged.

The beneficial effects of the utility model are as follows: compared with the existing self-centering clamping mechanism, the self-centering clamping mechanism for the rotary bar has the following technical characteristics and advantages:

1. The structure is simple; compared with the existing self-centering clamping mechanism, the self-centering clamping mechanism for the rotary bar greatly reduces the component number of mechanism parts, and can realize the operation function of the self-centering clamping mechanism by the minimum number of parts when in specific use;

2. The self-centering clamping mechanism for the rotary bar can be integrally arranged on a machine tool, and can position the bar before the clamping mechanism clamps the bar, so that the accuracy of bar clamping is ensured.

Drawings

FIG. 1 is a schematic diagram of a mounting assembly of the self-centering clamping mechanism for a rotary bar of the present utility model;

FIG. 2 is a schematic diagram of a second mounting assembly of the self-centering clamping mechanism for a rotary bar of the present utility model;

FIG. 3 is a schematic axial side view of a first clamping arm set and a second clamping arm set according to the present utility model;

FIG. 4 is a front view of the drive arm assembly of the present utility model;

FIG. 5 is a view showing the construction of the mounting shaft side of the driving arm assembly according to the present utility model;

FIG. 6 is a schematic illustration of the operation of the self-centering clamping mechanism of the present utility model;

FIG. 7 is a second specific operational schematic of the self-centering clamping mechanism of the present utility model;

The reference numerals in the figures are: the clamping device comprises a 1-first clamping arm set, a 2-second clamping arm set, a 3-first connecting rod, a 4-second connecting rod, a 5-driving arm assembly, a 6-hydraulic cylinder, a 7-rear box body, an 8-front box body, a 9-clamping arm connecting shaft, a 10-hydraulic rod, a 11-small diameter bar, a 12-large diameter bar, a 21-clamping arm main body, a 22-clamping roller, a 23-rotary shaft pin, a 51-horizontal driving arm, a 52-vertical driving arm, a 53-driving arm roller A, a 54-driving arm roller B, a 55-limiting block, a 56-limiting rod and a 57-limiting nut.

Description of the embodiments

In order to make the technical solution of the present utility model better understood by those skilled in the art, the present utility model is further described in detail below with reference to the drawings and the detailed description, and it should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly or indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used in the present document to indicate orientation are each based on the specific structure shown in the drawings, and do not constitute a limitation on the structure.

Specific example 1: as shown in the accompanying drawings 1 and 2 of the specification, the self-centering clamping mechanism for the rotary bar mainly comprises a first clamping arm group 1, a second clamping arm group 2, a first connecting rod 3, a second connecting rod 4, a driving arm combination piece 5, a hydraulic cylinder 6, a rear box body 7, a front box body 8 and a clamping arm connecting shaft 9, wherein the hydraulic cylinder 6 is arranged at the bottom of the outer side of the rear box body 7 and is tightly locked with the rear box body 7 through a locking nut, a hydraulic rod 10 for driving the driving arm combination piece 5 to lift up and down is arranged on the hydraulic cylinder 6, the driving arm combination piece 5 is arranged at the top part of the hydraulic rod 10 and is tightly connected with the top part of the hydraulic rod 10, the inner side of the upper part of the rear box body 7 is symmetrically provided with the clamping arm connecting shaft 9, the first clamping arm group 1 and the second clamping arm combination piece 2 for executing clamping positioning operation are arranged on the clamping arm connecting shaft 9 and are hinged with the clamping arm connecting shaft 9, the driving arm combination piece 5 is hinged with the first connecting rod 3 and the second connecting rod 4, when the driving arm combination piece 5 works, the driving arm combination piece 5 is tightly connected with the first clamping arm combination piece 7 through the first connecting rod 3 and the first clamping arm combination piece 2 and the first clamping arm combination piece 7 through the first connecting rod 2, and the first clamping arm combination piece 2 is tightly connected with the front box body 7 through the first connecting rod 2, and the first clamping arm combination piece 2 is tightly connected with the first box body 7.

As shown in fig. 3 of the specification of the present utility model, the first clamping arm set 1 and the second clamping arm set 2 for self-centering clamping and positioning a bar have the same structure, and the two clamping arm sets comprise a clamping arm main body 21, a clamping roller 22 and a rotary shaft pin 23, wherein an open slot is formed in the upper part of the clamping arm main body 21, a mounting shaft for mounting the clamping roller 22 is mounted in the open slot, the clamping roller 22 is mounted on the mounting shaft through a bearing, meanwhile, the rotary shaft pin 23 driven by the engagement of an adaptive connecting rod is mounted on the side surface of the clamping arm main body 21, the rotary shaft pin 23 and the clamping arm main body 21 are fixedly connected into a whole, the first connecting rod 3 and the second connecting rod 4 are provided with elongated clamping slots, and the first connecting rod 3 and the second connecting rod 4 are clamped on the rotary shaft pin 23 through the clamping slots during mounting.

As shown in fig. 4 and 5 of the specification of the present utility model, the driving arm assembly 5 for driving the first clamping arm set 1 and the second clamping arm set 2 to rotate around the clamping arm connecting shaft 9, so as to realize opening or clamping action comprises a horizontal driving arm 51, a vertical driving arm 52, a driving arm roller a53 and a driving arm roller B54, wherein the bottom of the horizontal driving arm 51 is installed at the top of the hydraulic rod 10 and is fixedly installed together with the top of the hydraulic rod 10, the vertical driving arm 52 for supporting the bottom of the bar is vertically and fixedly installed at the upper part of the horizontal driving arm 51, side open slots are formed at two side parts of the horizontal driving arm 51, driving arm rollers a53 for driving the clamping arm main body 21 to rotate inwards around the clamping arm connecting shaft 9 are installed in the side open slots, a top open slot is formed at the top of the vertical driving arm 52, driving arm rollers B54 for clamping the bottom of the workpiece are installed in the top open slots, two sets of limiting blocks 55 and 55 for limiting the upper limit of the horizontal driving arm 51 are symmetrically installed at the upper part of the inner side of the rear box 7, and the limiting blocks are fixedly connected with the inner side wall of the rear box 7. Two groups of limiting rods 56 are fixedly arranged at the bottom of the horizontal driving arm 51, threads are machined on the limiting rods 56, limiting nuts 57 are arranged on the limiting rods, during installation, the limiting nuts 57 are connected with the limiting rods 56 through threaded fit, once the hydraulic cylinder 6 moves excessively, the limiting nuts 57 collide with the bottom of the rear box body 7, the driving arm assembly 5 is prevented from continuing to descend, excessive opening of the clamping arms is avoided, it is required to say that through holes for adapting the limiting rods 56 to penetrate are formed in the bottom of the rear box body 7, the diameter of each through hole is larger than the outer diameter of each limiting rod 56 and smaller than the outer diameter of each limiting nut 57, during operation, the bottom of each limiting rod 56 can penetrate through the corresponding through hole, meanwhile, a pressure sensor for pressure detection is arranged on the hydraulic cylinder 6, and when the driving arm B54 contacts the surface of a bar, after the bar is clamped, the pressure sensor sends a signal to an electronic control system, and a certain pressure is kept unchanged in the hydraulic cylinder 6.

The working principle and working process of the self-centering clamping mechanism for the rotary bar provided by the utility model in specific operation are as follows:

Firstly, an operator can control the hydraulic cylinder 6 to start, at the moment, the hydraulic cylinder 6 provides a hydraulic rod 10 to drive the horizontal driving arm 51 to move downwards, at the moment, the horizontal driving arm 51 drives the first connecting rod 3 and the second connecting rod 4 to enable the upper parts of the first clamping arm set 1 and the second clamping arm set 2 to be in an open state, when the hydraulic cylinder 6 is opened to a certain extent, the hydraulic cylinder 6 stops working, at the moment, the processed bar can be taken away manually or automatically, and a new bar is put in;

In order to prevent misoperation, a limiting rod 56 is arranged at the bottom of the horizontal driving arm 51, threads are formed on the limiting rod 56, a limiting nut 57 is arranged on the limiting rod 56, the position of the limiting nut 57 on the limiting rod 56 can be adjusted according to actual conditions, and once the hydraulic cylinder 6 moves excessively downwards, the limiting nut 57 collides with the bottom of the rear box 7 to prevent the horizontal driving arm 51 from continuing to descend, so that excessive opening of the clamping arm is avoided;

Step three, an operator can hoist a bar to be processed to a proper position between a left driving arm and a right driving arm (a first clamping arm group 1 and a second clamping arm group 2), then, a hydraulic cylinder 6 is controlled to start, the hydraulic cylinder 6 drives a horizontal driving arm 51 to move upwards through a hydraulic rod 10, at the moment, driving arm rollers A53 arranged on two sides of the horizontal driving arm 51 are attached to an outer arc-shaped contour on the lower side of a clamping arm main body 21 (an outer arc-shaped contour which is suitable for the contact of the driving arm rollers A53 is formed on the lower side of the clamping arm main body 21), the clamping arm main body 21 is driven to rotate inwards around a clamping arm connecting shaft 9 until a clamping roller 22 clamps the bar, and meanwhile, driving arm rollers B54 arranged on a vertical driving arm 52 are just contacted with the surface of the bar from the lower side when the clamping roller 22 contacts with the surface of the bar, so that three-point automatic centering clamping is realized;

In order to prevent misoperation, a limiting block 55 for limiting the upper limit of the movement of the horizontal driving arm 51 is arranged at the upper part of the inner side of the rear box body 7, and once the hydraulic rod 10 in the hydraulic cylinder 6 moves excessively upwards, the limiting block 55 collides with the horizontal driving arm 51 to prevent the driving arm assembly 5 from continuously ascending as a whole, so that excessive clamping of the clamping arms (the first clamping arm group 1 and the second clamping arm group 2) is avoided;

A pressure sensor for detecting a pressure signal is arranged on the hydraulic cylinder 6, and after the driving arm roller B54 contacts the surface of the bar and clamps the bar, the pressure sensor sends a signal to an electric control system, so that certain pressure is kept unchanged in the hydraulic cylinder 6, and the bar can be kept at a fixed position and is kept still for the next processing or clamping of chucks at two ends of a machine tool;

And step six, after the operation processing is finished, returning to the step one for the next processing. The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims (9)

1. The utility model provides a rotatory rod self-centering clamping mechanism, a serial communication port, including first clamp arm group (1), second clamp arm group (2), first connecting rod (3), second connecting rod (4), drive arm closes piece (5), pneumatic cylinder (6), back box (7), preceding box (8) and clamp arm connecting axle (9), pneumatic cylinder (6) are installed in back box (7) outside bottom and are in the same place through lock nut and back box (7) locking installation, install hydraulic stem (10) on pneumatic cylinder (6), drive arm closes piece (5) and installs at hydraulic stem (10) top position and with hydraulic stem (10) top fastening link to each other, install clamp arm connecting axle (9) in the inboard symmetry of upper portion of back box (7), first clamp arm group (1), second clamp arm group (2) install on clamp arm connecting axle (9) and with clamp arm connecting axle (9) articulated, articulated on closing piece (5) have first connecting rod (3) and second clamp arm (4) and drive clamp arm group (1) and clamp arm action is realized through first connecting rod (3), the driving arm assembly (5) is connected with the second clamping arm set (2) through the second connecting rod (4) and drives the second clamping arm set (2) to realize clamping action, and the front box body (8) is covered on the rear box body (7) and is connected with the rear box body (7) through fastening bolts in a fastening mode.

2. The self-centering clamping mechanism for the rotary bar according to claim 1, wherein the first clamping arm group (1) and the second clamping arm group (2) have the same structure, the first clamping arm group and the second clamping arm group comprise a clamping arm main body (21), a clamping roller (22) and a rotary shaft pin (23), an opening groove is formed in the upper portion of the clamping arm main body (21), an installation shaft for installing the clamping roller (22) is installed in the opening groove, the clamping roller (22) is installed on the installation shaft through a bearing, the rotary shaft pin (23) is installed on the side face of the clamping arm main body (21), the rotary shaft pin (23) and the clamping arm main body (21) are fixedly connected into a whole, a strip-shaped clamping groove is formed in the first connecting rod (3) and the second connecting rod (4), and the first connecting rod (3) and the second connecting rod (4) are clamped on the rotary shaft pin (23) through the clamping groove.

3. The self-centering clamping mechanism for a rotary bar according to claim 1, wherein the driving arm assembly (5) comprises a horizontal driving arm (51), a vertical driving arm (52), a driving arm roller A (53) and a driving arm roller B (54), wherein the bottom of the horizontal driving arm (51) is arranged at the top of a hydraulic rod (10) and connected with the top of the hydraulic rod (10), the vertical driving arm (52) is arranged at the upper part of the horizontal driving arm (51), the vertical driving arm (52) is vertically fixedly connected with the horizontal driving arm (51), two sides of the horizontal driving arm (51) are provided with edge open slots, driving arm roller A (53) for driving a clamping arm main body (21) to rotate inwards around a clamping arm connecting shaft (9) is arranged in the edge open slots, the top open slots are formed in the top of the vertical driving arm (52), and driving arm roller B (54) for supporting and clamping the bottom of a workpiece is arranged in the top open slots.

4. The self-centering clamping mechanism for the rotary bar according to claim 3, further characterized in that a limiting block (55) for limiting the upper limit of the horizontal driving arm (51) is arranged on the upper portion of the inner side of the rear box body (7), and the limiting block (55) and the inner side wall of the rear box body (7) are fixedly connected into a whole.

5. A self-centering clamping mechanism for a rotary bar according to claim 3, further characterized in that a stop lever (56) is fixedly arranged at the bottom of the horizontal driving arm (51), threads are formed on the stop lever (56) and a stop nut (57) is arranged on the stop lever (56), the stop nut (57) is connected with the stop lever (56) through threaded fit, and once the hydraulic cylinder (6) moves excessively, the stop nut (57) collides with the bottom of the rear box (7) to prevent the driving arm assembly (5) from continuing to descend and avoid excessive opening of the clamping arm.

6. The self-centering clamping mechanism for a rotary bar according to claim 5, further characterized in that a through hole for adapting to the penetration of the limit rod (56) is formed at the bottom of the rear box body (7), and the hole diameter of the through hole is larger than the outer diameter of the limit rod (56) and smaller than the outer diameter of the limit nut (57).

7. A self-centering clamping mechanism for a rotating bar as claimed in claim 5, further characterized in that two sets of stop bars (56) are symmetrically mounted on the bottom of the horizontal driving arm (51).

8. The self-centering clamping mechanism for a rotary bar according to claim 4, further characterized in that two sets of limiting blocks (55) for limiting the upper limit of the horizontal driving arm (51) are symmetrically arranged at the upper part of the inner side of the rear box body (7).

9. A self-centering clamping mechanism for a rotating rod according to claim 3, further characterized in that a pressure sensor is provided on the hydraulic cylinder (6), and when the driving arm roller B (54) contacts the surface of the rod, after clamping the rod, the pressure sensor sends a signal to the electronic control system, so that a certain pressure is maintained in the hydraulic cylinder (6).