CN219747394U - Workpiece positioning device - Google Patents

Abstract

The utility model provides a workpiece positioning device, which comprises: a mounting base; the positioning seat is arranged on the mounting seat and is provided with a bearing table for bearing the workpiece; the clamping mechanism is arranged on the mounting seat and used for clamping a workpiece; the compressing mechanism is arranged on the positioning seat and used for compressing the workpiece from the upper part of the workpiece; the limiting mechanism is arranged on the positioning seat and is used for limiting the workpiece from the first end of the workpiece; the pushing mechanism is arranged on the positioning seat and used for pushing the workpiece from the second end of the workpiece. According to the utility model, the clamping mechanism clamps the workpiece, the pressing mechanism presses the workpiece from the upper part of the workpiece, and the limiting mechanism and the pushing mechanism work together to clamp the workpiece from the two ends of the workpiece, so that the workpiece can be kept at the position when in a clamping state, the position can meet the positioning requirement of the workpiece, the workpiece can be accurately positioned, the workpiece is clamped by other devices and then is placed at the polishing device for polishing, and the precision requirement of the polishing size of the workpiece is met.

Description

Workpiece positioning device

Technical Field

The utility model relates to the technical field of grinding and polishing, in particular to a workpiece positioning device.

Background

When an industrial robot is used for polishing a workpiece, an end effector of the robot is required to clamp the workpiece from the profiling material rack for feeding, a mechanical arm of the robot controls the workpiece to be close to a contact polishing tool for polishing, and the polishing tool is relatively fixed. For the workpiece with low or no requirement on the size precision, the workpiece can be clamped on the profiling material rack for direct polishing. However, for workpieces with high polishing dimensional accuracy requirements, the positioning accuracy of the profiling material rack cannot meet the requirements.

Disclosure of Invention

In view of the above, the utility model provides a workpiece positioning device, which aims to solve the problem that the positioning precision of a profiling material rack in the prior art cannot meet the requirement of higher polishing precision.

The utility model provides a workpiece positioning device, which comprises: a mounting base; the positioning seat is arranged on the mounting seat and is provided with a bearing table for bearing the workpiece; the clamping mechanism is arranged on the mounting seat and used for clamping a workpiece; the compressing mechanism is arranged on the positioning seat and used for compressing the workpiece from the upper part of the workpiece; the limiting mechanism is arranged on the positioning seat and is used for limiting the workpiece from the first end of the workpiece; the pushing mechanism is arranged on the positioning seat and used for pushing the workpiece from the second end of the workpiece.

Further, in the workpiece positioning device, the clamping mechanism includes: the parallel finger cylinder is arranged on the mounting seat; the two clamping jaws are connected with the two driving ends of the parallel finger cylinder in a one-to-one correspondence manner, and are respectively arranged at two sides of the bearing table; the two clamping plates are connected with the two clamping jaws in one-to-one correspondence and with adjustable angles so that the two clamping plates are contacted with the workpiece; the parallel finger cylinder is used for driving the two clamping jaws to approach to each other so as to drive the two clamping plates to clamp the workpiece from the two sides of the workpiece.

Further, in the workpiece positioning device, one side of each clamping plate far away from the workpiece is vertically provided with a mounting plate, and each mounting plate is provided with a mounting hole; the top of each clamping jaw is provided with a rotating shaft, and the rotating shafts are rotatably penetrated with corresponding mounting holes; each mounting plate has a predetermined length such that a predetermined gap is provided between the corresponding clamping plate and the clamping jaw.

Further, in the workpiece positioning device, the pressing mechanism includes: the rotary clamping cylinder is arranged on the positioning seat; the bracket is arranged on the swing arm of the rotary clamping cylinder in an adjustable position so as to adjust the deflection angle of the bracket and the distance between the bracket and the workpiece; the roller wheel of flexible material rotationally sets up in the support for compress tightly the work piece.

Further, in the workpiece positioning device, a threaded column is arranged at the top of the bracket; the swing arm of the rotary clamping cylinder is provided with a threaded hole, and the threaded column is in threaded connection with the threaded hole.

Further, in the workpiece positioning device, the limiting mechanism includes: the locating seat is provided with a baffle at the first end corresponding to the workpiece, the baffle is vertically connected with the bearing table, and the locating body is adjustably connected with the baffle in position so as to adjust the position of the locating body and further limit the workpiece.

Further, in the workpiece positioning device, the limiting mechanism further includes: the baffle is provided with a bar-shaped hole along the length direction of the baffle, one surface of the limiting body facing the baffle is provided with a groove, the groove is slidably buckled on the baffle, the bottom of the groove is provided with a threaded hole, and the locking bolt movably penetrates through the bar-shaped hole and is in threaded connection with the threaded hole.

Further, in the workpiece positioning device, the pushing mechanism includes: the triaxial cylinder is arranged on the positioning seat; the pushing plate is arranged at the driving end of the triaxial air cylinder and used for pushing the workpiece.

Further, the workpiece positioning device further includes: the air pipe is arranged on the mounting seat, the first end of the air pipe is used for being connected with the air conveying device, and the second end of the air pipe is arranged above the workpiece so as to convey the sweeping air to the positioning seat.

Further, the workpiece positioning device further includes: the two side plates are arranged on the positioning seat and are respectively arranged on two sides of the bearing table, and each side plate has preset elasticity so as to support the workpiece from two sides of the workpiece.

According to the utility model, the bearing table of the positioning seat bears the workpiece, the clamping mechanism clamps the workpiece according to the positioning requirement of the workpiece and the position where the workpiece needs to be held, the workpiece is tightly pressed by the pressing mechanism from the upper part of the workpiece, and the two ends of the workpiece are clamped by the limiting mechanism and the pushing mechanism in a combined action mode, so that the workpiece is kept at the position when in a clamping state, the positioning requirement of the workpiece can be met, the accurate positioning of the workpiece is realized, the workpiece is clamped by other devices and then is placed at the polishing device for polishing, the polishing size precision requirement of the workpiece is met, and the problem that the positioning precision of the profiling material frame in the prior art cannot meet the higher polishing precision requirement is solved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic diagram of a workpiece positioning device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of another state of the workpiece positioning device according to the embodiment of the utility model.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 2, a preferred structure of the workpiece positioning device in this embodiment is shown. As shown, the workpiece positioning device includes: the device comprises a mounting seat 1, a positioning seat 2, a clamping mechanism 3, a pressing mechanism 4, a limiting mechanism 5 and a pushing mechanism 6. The positioning seat 2 is disposed on the mounting seat 1, and the positioning seat 2 is provided with a bearing table 10, and the bearing table 10 is used for bearing the workpiece 7. Specifically, the carrying table 10 may have an elongated shape so as to accommodate the workpiece 7.

The clamping mechanism 3 is provided to the mount 1, and the clamping mechanism 3 is used for clamping the workpiece 7, specifically, the clamping mechanism 3 clamps the workpiece 7 from both sides of the workpiece 7.

The pressing mechanism 4 is arranged on the positioning seat 2, and the pressing mechanism 4 is used for pressing the workpiece 7 from the upper part of the workpiece 7 and pressing the workpiece 7 onto the bearing table 10.

The limiting mechanism 5 is disposed on the positioning seat 2, and the limiting mechanism 5 is used for limiting the workpiece 7 from a first end (a lower end shown in fig. 1) of the workpiece 7. A pushing mechanism 6 is provided to the positioning seat 2, the pushing mechanism 6 being for pushing the workpiece 7 from a second end (an upper end shown in fig. 1) of the workpiece 7. In this way, the limiting mechanism 5 cooperates with the pushing mechanism 6 to clamp the workpiece 7 from both ends of the workpiece 7.

In specific implementation, the top surface (upper surface shown in fig. 1) of the mounting seat 1 is inclined, and the positioning seat 2 is arranged on the top surface of the mounting seat 1. Because the top surface of the mounting seat 1 is obliquely arranged, the positioning seat 2, the clamping mechanism 3, the pressing mechanism 4, the limiting mechanism 5 and the pushing mechanism 6 are all in an oblique shape. The first end of the workpiece 7 corresponds to a position lower in the top surface of the mount 1, and the second end of the workpiece 7 corresponds to a position upper in the top surface of the mount 1, and the second end to the first end of the workpiece 7 are disposed obliquely downward.

It can be seen that in this embodiment, the carrying table 10 of the positioning seat 2 carries the workpiece 7, according to the positioning requirement of the workpiece 7 and the position where the workpiece 7 needs to be held, the clamping mechanism 3 clamps the workpiece 7, the pressing mechanism 4 presses the workpiece 7 from the upper portion of the workpiece 7, the limiting mechanism 5 and the pushing mechanism 6 jointly act to clamp the workpiece 7 from two ends of the workpiece 7, so that the workpiece 7 is kept at the position when in the clamping state, the positioning requirement of the workpiece 7 can be met, the accurate positioning of the workpiece 7 is realized, then the workpiece 7 is clamped by other devices and then is placed at the polishing device for polishing, the requirement of the polishing size of the workpiece 7 is met, and the problem that the positioning precision of the profiling rack in the prior art cannot meet the requirement of higher polishing precision is solved.

Referring to fig. 1 and 2, in the above embodiment, the clamping mechanism 3 includes: a parallel finger cylinder 31, two jaws 32 and two clamping plates 33. Wherein, parallel finger cylinder 31 is disposed at mount 1. Specifically, the parallel finger cylinder 31 has two driving ends which are disposed opposite to each other, and the two driving ends may be close to each other or may be away from each other. And, the two driving ends are respectively disposed at the left and right sides of the loading table 10.

The two clamping jaws 32 are in one-to-one correspondence with the two driving ends of the parallel finger cylinder 31, and each clamping jaw 32 is connected with the corresponding driving end of the parallel finger cylinder 31, and the two driving ends of the two clamping jaws 32 are relatively fixed when the connection is in fixed connection. Two clamping jaws 32 are placed on either side of the carrying floor 10.

Two clamping plates 33 are in one-to-one correspondence with two clamping jaws 32, and each clamping plate 33 is connected with the corresponding clamping jaw 32 in an angle adjustable manner so as to adjust the angle between each clamping plate 33 and the corresponding clamping jaw 32, and each clamping plate 33 can be in close contact with the workpiece 7.

The parallel finger cylinder 31 is used for driving the two driving ends to approach each other, and the two driving ends drive the two clamping jaws 32 to approach each other, so that the two clamping plates 33 are driven to clamp the workpiece 7 from two sides of the workpiece 7.

Preferably, the side of each clamping plate 33 remote from the workpiece 7 is vertically provided with a mounting plate 34, in particular a first side of each clamping plate 33 in contact with the workpiece 7, a second side of each clamping plate 33 being arranged opposite the first side, the second side of each clamping plate 33 being provided with a mounting plate 34. Each mounting plate 34 is perpendicular to the corresponding clamping plate 33, and each mounting plate 34 extends away from the clamping plate 33. Each mounting plate 34 is provided with a mounting hole.

The top of each clamping jaw 32 is provided with a rotating shaft 35, and the corresponding mounting holes are rotatably penetrated through by the rotating shafts 35. Specifically, each mounting plate 34 extends to the top of the corresponding jaw 32, with a mounting hole disposed above the top of the jaw 32 and a spindle 35 rotatable within the mounting hole such that the mounting plates 34 are rotatable about the spindle 35, i.e., such that the clamping plate 33 is rotatable relative to the jaw 32.

Each mounting plate 34 has a predetermined length such that a predetermined gap is provided between the corresponding clamping plate 33 and the clamping jaw 32. In practical implementation, the preset length and the preset gap may be determined according to practical situations, which is not limited in this embodiment. In order to provide a certain clearance between the clamping plate 33 and the clamping jaw 32, the length of the mounting plate 34 may be increased.

It can be seen that in this embodiment, the two clamping jaws 32 are driven to approach each other by the parallel finger cylinder 31 to drive the two clamping plates 33 to clamp the workpiece 7 from two sides of the workpiece 7, so that the structure is simple and implementation is convenient. And, every splint 33 rotationally around locating the pivot 35 at corresponding clamping jaw 32 top for splint 33 is rotatable, can adapt to the contained angle error of work piece 7 both sides plane, makes work piece 7 centering in the thickness direction, ensures that two splint 33 all and work piece 7 in close contact with, and then improves the clamping effect of two splint 33 to work piece 7.

Referring to fig. 1 to 2, in each of the above embodiments, the pressing mechanism 4 includes: the clamping cylinder 41, the bracket 43 and the roller 44 are rotated. Wherein the rotary clamping cylinder 41 is arranged on the positioning seat 2. The bracket 43 is adjustably positioned on the swing arm 42 of the rotary clamping cylinder 41 to adjust the deflection angle of the bracket 43 and the distance between the bracket 43 and the workpiece 7.

A roller 44 is rotatably provided to the bracket 43 for pressing the workpiece 7 from the upper portion of the workpiece 7. The roller 44 is made of a flexible material, specifically, the peripheral wall of the roller 44 is made of a flexible material, so as to protect the workpiece 7, avoid damaging or scratching the surface of the workpiece 7, play an anti-slip role, and ensure stable compression of the roller 44 on the workpiece 7. The roller 44 is provided with a bearing therein, and the bearing is provided on the bracket 43 so that the roller can freely rotate in the bracket 43.

It can be seen that, in this embodiment, the rotary clamping cylinder 41 drives the bracket 43 to rotate and move downwards, and drives the roller 44 to move downwards to compress the workpiece 7, so that, in order to make the roller 44 compress the workpiece 7 accurately and stably after rotating, the position of the bracket 43 on the swing arm 42 of the rotary clamping cylinder 41 is adjustable, so as to adjust the position between the bracket 43 and the workpiece 7, ensure that the roller 44 is compressed in stable contact with the workpiece 7, and the angle of the bracket 43 on the swing arm 42 of the rotary clamping cylinder 41 is adjustable, so that the position of the bracket 43 at the same height, that is, the orientation of the roller 44 at the same height can be adjusted, that is, the roller 44 is oriented in the required direction according to the requirement.

Referring to fig. 1 to 2, in each of the above embodiments, the top of the bracket 43 is provided with a screw column 45. The swing arm 42 of the rotary clamping cylinder 41 is provided with a threaded hole, and the threaded column 45 is in threaded connection with the threaded hole. The distance between the bracket 43 and the workpiece 7, namely, the distance between the roller 44 and the workpiece 7 is adjusted by screwing the threaded column 45, so that the roller 44 is ensured to be pressed against the workpiece 7 under the driving of the rotary clamping cylinder 41, and the roller 44 can be oriented in different directions when screwing the threaded column 45.

Referring to fig. 1 to 2, in each of the above embodiments, the positioning seat 2 is provided with the baffle 11 at the first end corresponding to the workpiece 7, and the baffle 11 is vertically connected to the loading table 10, the baffle 11 and the loading table 10 form an L-shape.

The limit mechanism 5 includes: a stopper 51. The limiting body 51 is adjustably connected with the baffle 11 in position, so as to adjust the position of the limiting body 51 on the baffle 11, and further limit the workpiece 7.

Preferably, the limiting mechanism 5 further includes: locking bolt 52. Wherein the baffle 11 is provided with a strip-shaped hole 111 along its length direction (up-down direction shown in fig. 1). The longitudinal direction of the baffle 11 is perpendicular to the longitudinal direction (left-to-right direction shown in fig. 1) of the stage 10, and the longitudinal direction of the bar-shaped hole 111 is parallel to the longitudinal direction of the baffle 11.

The limiting body 51 is provided with a groove on one surface facing the baffle 11, and the groove is slidably buckled on the baffle 11, so that the limiting body 51 can freely slide along the length direction of the baffle 11. The bottom of the groove is provided with a threaded hole, and the locking bolt 52 is movably arranged in the strip-shaped hole 111 in a penetrating mode and is in threaded connection with the threaded hole. Specifically, according to the position of the first end of the workpiece 7, the stopper 51 slides along the length direction of the baffle 11, and since the lock bolt 52 is movably inserted through the bar-shaped hole 111, the lock bolt 52 can slide in the bar-shaped hole 111, that is, the stopper 51 slides within the length range of the bar-shaped hole 111. When the limiting body 51 slides to a required position, the locking bolt 52 is in threaded connection with a threaded hole in the limiting body 51, so that the limiting body 51 is kept at the position and is still, and further, the limiting body 51 is ensured to limit the first end of the workpiece 7.

It can be seen that in this embodiment, the position of the limiting body 51 on the baffle 11 along the length direction thereof is adjustable, so that the workpiece 7 with different sizes can be adapted, the limiting body 51 can limit the first end of the workpiece 7, and the workpieces 7 with the same shape and different sizes can be accurately positioned by sharing the same workpiece positioning device, so that the universality is strong, the structure is simple, and the implementation is convenient.

Referring to fig. 1 to 2, in each of the above embodiments, the pushing mechanism 6 includes: a triaxial cylinder 61 and a push plate 62. The triaxial cylinder 61 is disposed on the positioning seat 2, and the pushing plate 62 is disposed on the driving end of the triaxial cylinder 61 and is used for pushing the workpiece 7. Specifically, the triaxial cylinder 61 drives the pushing plate 62 to move toward the second end of the workpiece 7, so that the pushing plate 62 pushes the second end of the workpiece 7. It can be seen that the pushing mechanism 6 is simple in structure and convenient to implement.

Referring to fig. 1 to 2, in each of the above embodiments, the workpiece positioning device may further include: and a trachea 8. Wherein, the air pipe 8 is arranged on the mounting seat 1, a first end (lower end shown in fig. 1) of the air pipe 8 is used for being connected with the gas transmission device, and a second end (upper end shown in fig. 1) of the air pipe 8 is arranged above the workpiece 7 so as to convey the sweeping gas to the positioning seat 2. Specifically, the first end of the air pipe 8 is used for receiving the purge gas conveyed by the gas conveying device, and the second end of the air pipe 8 conveys the purge gas to the upper side of the workpiece 7, so that the purge gas purges the positioning seat 2. More specifically, the second end of the air tube 8 is placed above the push plate 62 and towards the carrying floor 10 to facilitate the purge air purging the positioning bed 2. Like this, at the in-process of polishing, sweep positioning seat 2, can reduce the accumulation of dust on work piece positioner, avoid the dust to influence positioning accuracy.

Referring to fig. 1 to 2, in each of the above embodiments, the workpiece positioning device may further include: two side plates 9. Wherein, two curb plates 9 all set up in positioning seat 2 to, two curb plates 9 are arranged in the both sides of plummer 10 respectively, and every curb plate 9 all has to predetermine elasticity, and two curb plates 9 support work piece 7 from the both sides of work piece 7. In practical implementation, the preset elasticity may be determined according to practical situations, and this embodiment does not limit this. In this way, the two side plates 9 can laterally support the workpiece 7, prevent the workpiece 7 from turning sideways, and ensure that the workpiece 7 is stably placed on the carrying table 10.

Referring to fig. 1 to 2, first, according to the position of the first end of the workpiece 7, the limiting body 51 is slid, so that the limiting body 51 is in stable contact with the first end of the workpiece 7, then the locking bolt 52 is screwed, the locking bolt 52 is screwed with the threaded hole on the limiting body 51, that is, the limiting body 51 is fixed, and at this time, the limiting body 51 limits the first end of the workpiece 7. The robot places the workpiece 7 on the carrying table 10, and the top surface of the mounting seat 1 is inclined, so that the workpiece 7 tends to slide at the position of the directional limiting body 51 under the action of gravity. Two side plates 9 support both sides of the workpiece 7. The rotary clamping cylinder 41 is started, the swing arm 42 of the rotary clamping cylinder 41 rotates clockwise by 90 degrees, and then the workpiece 7 is pressed downwards, so that the roller 44 presses the workpiece. Then, the triaxial cylinder 61 drives the pushing plate 62 to move toward the second end of the workpiece 7, the pushing plate 62 pushes the second end of the workpiece 7 so that the workpiece 7 is abutted against the stopper 51, during this pushing process, the roller 44 always presses the workpiece 7, and the roller 44 can allow the workpiece 7 to slide slightly without being scratched under the pressing condition. Finally, the parallel finger cylinder 31 drives the two clamping plates 33 to approach each other at the same time, the clamping plates 33 press the side surfaces of the workpiece 7, and the two clamping plates 33 clamp the workpiece 7 from both sides of the workpiece 7. The parallel finger cylinder 31, the rotary clamping cylinder 41 and the triaxial cylinder 61 are kept clamped, the position of the workpiece 7 meets the requirement for polishing, the state is kept still, the robot clamps the workpiece 7 again, then the parallel finger cylinder 31, the rotary clamping cylinder 41 and the triaxial cylinder 61 are released simultaneously, and the robot removes the workpiece 7 from the carrying table 10 to polish the workpiece 7.

To sum up, in this embodiment, the plummer 10 of positioning seat 2 bears work piece 7, according to the location demand of work piece 7 and the position that work piece 7 needs to keep, clamping mechanism 3 presss from both sides tight work piece 7, hold-down mechanism 4 compresses tightly work piece 7 from the upper portion of work piece 7, stop gear 5 and pushing mechanism 6 combined action presss from both ends of work piece 7 to work piece 7, make work piece 7 keep being in the position when clamping state, this position can satisfy the location demand of work piece 7, the accurate positioning of work piece 7 has been realized, then place work piece 7 centre gripping through other devices in grinding device department again and polish, the precision requirement of work piece 7 polishing size has been satisfied, the device simple structure, degree of automation is high, through the cylinder driving action, need not manual operation, repeated positioning accuracy is high, can carry out accurate positioning to work piece 7.

It should be noted that, in the description of the present utility model, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A workpiece positioning device, comprising:

a mounting base (1);

the positioning seat (2) is arranged on the mounting seat (1), and the positioning seat (2) is provided with a bearing table (10) for bearing a workpiece (7);

the clamping mechanism (3) is arranged on the mounting seat (1) and used for clamping the workpiece (7);

the pressing mechanism (4) is arranged on the positioning seat (2) and is used for pressing the workpiece (7) from the upper part of the workpiece (7);

the limiting mechanism (5) is arranged on the positioning seat (2) and is used for limiting the workpiece (7) from the first end of the workpiece (7);

the pushing mechanism (6) is arranged on the positioning seat (2) and is used for pushing the workpiece (7) from the second end of the workpiece (7).

2. Workpiece positioning device according to claim 1, characterized in that the clamping mechanism (3) comprises:

a parallel finger cylinder (31) arranged on the mounting seat (1);

the two clamping jaws (32) are connected with the two driving ends of the parallel finger cylinder (31) in a one-to-one correspondence manner, and the two clamping jaws (32) are respectively arranged at two sides of the bearing table (10);

two clamping plates (33) which are connected with the two clamping jaws (32) in a one-to-one correspondence and with adjustable angles so that the two clamping plates (33) are contacted with the workpiece (7);

the parallel finger cylinder (31) is used for driving the two clamping jaws (32) to approach to drive the two clamping plates (33) to clamp the workpiece (7) from two sides of the workpiece (7).

3. A workpiece positioning apparatus as defined in claim 2, wherein,

a mounting plate (34) is vertically arranged on one side, far away from the workpiece (7), of each clamping plate (33), and each mounting plate (34) is provided with a mounting hole;

a rotating shaft (35) is arranged at the top of each clamping jaw (32), and the rotating shafts (35) are rotatably penetrated through corresponding mounting holes;

each mounting plate (34) has a predetermined length such that a predetermined gap is provided between the corresponding clamping plate (33) and the clamping jaw (32).

4. Workpiece positioning device according to claim 1, characterized in that the hold-down mechanism (4) comprises:

a rotary clamping cylinder (41) arranged on the positioning seat (2);

a bracket (43) which is arranged on a swing arm (42) of the rotary clamping cylinder (41) in an adjustable position so as to adjust the deflection angle of the bracket (43) and the distance between the bracket (43) and the workpiece (7);

and the roller (44) is made of flexible materials, is rotatably arranged on the bracket (43) and is used for pressing the workpiece (7).

5. A workpiece positioning apparatus as defined in claim 4, wherein,

a threaded column (45) is arranged at the top of the bracket (43);

a swing arm (42) of the rotary clamping cylinder (41) is provided with a threaded hole, and the threaded column (45) is in threaded connection with the threaded hole.

6. Workpiece positioning device according to claim 1, characterized in that the limiting mechanism (5) comprises:

the locating seat (2) is provided with a baffle (11) at a first end corresponding to the workpiece (7), the baffle (11) is vertically connected with the bearing table (10), and the locating seat (51) is connected with the baffle (11) in a position-adjustable mode so as to adjust the position of the locating seat (51) and limit the workpiece (7).

7. The workpiece positioning device according to claim 6, characterized in that the limiting mechanism (5) further comprises:

the locking bolt (52), bar hole (111) have been seted up along its length direction to baffle (11), spacing body (51) orientation the one side of baffle (11) is seted up flutedly, the recess slidable detain locate baffle (11), the screw hole has been seted up to the bottom of recess, locking bolt (52) movably wear to locate bar hole (111) and with screw hole looks spiro union.

8. Workpiece positioning device according to claim 1, characterized in that the pushing mechanism (6) comprises:

the triaxial cylinder (61) is arranged on the positioning seat (2);

the pushing plate (62) is arranged at the driving end of the triaxial air cylinder (61) and is used for pushing the workpiece (7).

9. The workpiece positioning device of claim 1, further comprising:

the air pipe (8) is arranged on the mounting seat (1), a first end of the air pipe (8) is used for being connected with the gas transmission device, and a second end of the air pipe (8) is arranged above the workpiece (7) so as to convey the sweeping gas to the positioning seat (2).

10. The workpiece positioning device of claim 1, further comprising:

two curb plates (9) all set up in positioning seat (2) and place respectively in the both sides of plummer (10), every curb plate (9) all have preset elasticity, in order to follow both sides of work piece (7) support work piece (7).