CN214770629U - Workpiece fixing device and numerical control machining equipment - Google Patents

Abstract

The utility model discloses a work piece fixing device and numerical control processing equipment, include: a support frame; the positioning boss is arranged on the support frame and provided with a channel hole penetrating through the height of the positioning boss; the liftable air suction guide column is in sliding fit with the channel hole and is provided with an air passage; the power mechanism and the clamp plate that links to each other with the output of power mechanism that locate the support frame, the clamp plate is used for corresponding the position in passageway hole to be equipped with the hole of stepping down, and power mechanism drive clamp plate switches between operating position and idle position, and wherein, operating position is the position that the clamp plate pressure was located the location boss top, and the idle position is the position that the location boss was dodged to the clamp plate. The workpiece can be adsorbed and fixed and pressed and fixed at one station, namely, after the workpiece is mounted on the positioning boss for one time, the workpiece can be fixed in two procedures of outline processing and hole site processing, the outline dimension of the workpiece is ensured, and the relative position precision between each hole site on the workpiece and the outline edge of the workpiece is ensured.

Description

Workpiece fixing device and numerical control machining equipment

Technical Field

The utility model relates to a mechanical process equips technical field, more specifically says, relates to a work piece fixing device. Furthermore, the utility model discloses still relate to a numerical control processing equipment including above-mentioned work piece fixing device.

Background

In the technical field of machining, a plurality of hole sites are generally required to be machined on a workpiece, when the workpiece is machined, the dimensional accuracy of the workpiece itself needs to be ensured, and meanwhile, the relative position accuracy between each hole site and the outline edge of the workpiece needs to be ensured.

When processing the work piece, generally adopt the tool of breathing in to adsorb fixed work piece, however, for some products, especially for electronic product such as cell-phone camera back cover, wrist-watch and on-vehicle digital display dial plate, because the size of work piece itself is less, when trompil on the work piece, the area except each hole on the work piece is littleer, this moment, if still adopt the fixed mode of absorption to fix the work piece, will make the work piece fixed insecure, consequently, when processing each hole site on the work piece, can't guarantee the relative position precision between each hole site and the work piece appearance edge on the work piece.

In the prior art, in order to improve the relative position precision between each hole position on a workpiece and the edge of the appearance of the workpiece, a special adsorption jig and a mechanical clamping jig are respectively adopted to fix the workpiece, and the appearance of the workpiece is processed when the adsorption jig is adopted to fix the workpiece; when a special mechanical clamping jig is used for fixing the workpiece, all hole positions on the workpiece are machined.

Although the method can improve the relative position precision between the hole position on the workpiece and the outer shape edge of the workpiece to a certain extent, the positioning reference is different when the workpiece is clamped twice because the workpiece is required to be clamped twice, so that the reference error exists, and the relative position precision between the hole position on the workpiece and the outer shape edge of the workpiece cannot be met for products with higher precision requirements.

In summary, how to provide a workpiece fixing device, which can firmly fix a workpiece in the processes of contour machining and hole location machining of the workpiece, and can ensure the relative position precision between each hole location on the workpiece and the contour edge of the workpiece while ensuring the contour dimension of the workpiece.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a workpiece fixing device, which can firmly fix a workpiece during both contour machining and hole site machining of the workpiece, so as to ensure the accuracy of the relative position between each hole site and the contour edge of the workpiece while ensuring the contour dimension of the workpiece.

Another object of the utility model is to provide a numerical control processing equipment including above-mentioned work piece fixing device, its machining precision is high, and machining efficiency is high.

In order to achieve the above object, the present invention provides the following technical solutions:

a workpiece fixture apparatus comprising:

a support frame;

the positioning boss is arranged on the support frame and provided with a channel hole penetrating through the height of the positioning boss;

the liftable air suction guide column is in sliding fit with the channel hole and is provided with an air passage;

the power mechanism is arranged on the support frame, the pressing plate is connected with the output end of the power mechanism, a yielding hole is formed in the position, corresponding to the channel hole, of the pressing plate, the power mechanism drives the pressing plate to be switched between a working position and an idle position, the working position is the position, above the positioning boss, of the pressing plate in a pressing mode, and the idle position is the position, above the positioning boss, of the pressing plate yielding.

Preferably, the bottom end of the air suction guide column is connected with a sealed air suction table, the sealed air suction table is provided with an air suction cavity and a first air suction port communicated with the air suction cavity, and the air passage is communicated with the air suction cavity.

Preferably, the sealing suction table is connected with a guide rod cylinder.

Preferably, the sealed air suction table is provided with a limiting guide pillar, and when the guide rod cylinder drives the sealed air suction table to ascend to the highest position, the limiting guide pillar abuts against the preset position of the support frame.

Preferably, the support frame is provided with a protective cover, and when the guide rod cylinder drives the sealed air suction table to ascend to the highest position, the sealed air suction table is located in the protective cover.

Preferably, the power mechanism comprises a rotary cylinder with a lifting function.

Preferably, the bottom of the pressing plate is provided with a limiting column, the supporting frame is provided with a limiting hole, and when the pressing plate is located at the working position, the limiting column is matched with the limiting hole.

Preferably, the support frame comprises:

the boss fixing panel is fixedly arranged on the positioning boss;

the first fixed seat of the power mechanism is mounted on the mounting base plate;

and the side plate is connected between the boss fixing panel and the mounting bottom plate.

Preferably, the positioning boss is further provided with a suction duct extending in a height direction thereof and a second suction port communicating with the suction duct.

A numerical control machining apparatus includes any one of the above workpiece fixing devices.

The utility model provides a workpiece fixing device, after the work piece is positioned on the location boss, at first the appearance of work piece is processed, at this moment, the guide pillar of breathing in rises to the position of being parallel and level with the top surface of location boss to utilize the air flue of the guide pillar of breathing in to breathe in, thereby make the work piece adsorbed and fixed in the location boss; that is, when the appearance of the workpiece is processed, the workpiece is fixed by the suction force in the air passage of the air suction guide pillar. When the appearance of the workpiece is processed and the preset position of the workpiece needs to be perforated, the air suction guide post descends to avoid interference with the perforating tool. In addition, power unit action, the drive clamp plate moves to operating position, promptly, makes the clamp plate press and locates the top of location boss, because the position that the clamp plate corresponds the passageway hole is equipped with the hole of stepping down, consequently, the clamp plate compresses tightly the position on the work piece except waiting the trompil position this moment, compresses tightly the work piece fixedly to in order to carry out the trompil to the work piece.

Therefore, the utility model provides a workpiece fixing device can realize on a station that the absorption to the work piece is fixed and compress tightly fixedly, also promptly, makes the work piece in location boss last time install the back, can realize that the work piece is fixed in appearance processing and hole site processing twice process, ensures the overall dimension of work piece to can guarantee the relative position precision between each hole site and the work piece appearance edge on the work piece.

The utility model provides a numerical control processing equipment, including above-mentioned work piece fixing device, have above-mentioned beneficial effect, consequently this numerical control processing equipment's machining precision is high, and machining efficiency is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a workpiece fixing device (one of the side plates of the supporting frame and one of the protective covers are not shown) according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

fig. 3 is a schematic external structural view of a workpiece fixing device according to an embodiment of the present invention;

FIG. 4 is a schematic view of the positioning boss of FIG. 1;

fig. 5 is a schematic structural diagram of fig. 4 from another view angle.

The reference numerals in fig. 1 to 5 are as follows:

the device comprises a support frame 1, a boss fixing panel 11, a limit hole 111, an installation bottom plate 12, a side plate 13, a positioning boss 2, a channel hole 21, an air suction duct 22, a second air suction port 23, an air suction guide post 3, a power mechanism 4, a rotary cylinder 41, a first fixing seat 42, a pressing plate 5, a limit post 51, a sealed air suction table 6, a first air suction port 61, a limit guide post 62, a guide rod cylinder 7, a second fixing seat 71, a transfer push block 72, a protective cover 8 and a workpiece 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a workpiece fixing device, it is fixed firm to carry out appearance processing and hole site course of working homoenergetic to the work piece to when guaranteeing work piece overall dimension, guarantee the relative position precision between each hole site and the work piece appearance edge on the work piece. The other core of the utility model is to provide a numerical control processing equipment including above-mentioned work piece fixing device, its machining precision is high, and machining efficiency is high.

Referring to fig. 1 to 5, fig. 1 is a schematic structural view of a workpiece fixing device (one of the side plates and one of the protective covers of the supporting frame are not shown) according to an embodiment of the present invention; FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective; fig. 3 is a schematic external structural view of a workpiece fixing device according to an embodiment of the present invention; FIG. 4 is a schematic view of the positioning boss of FIG. 1;

fig. 5 is a schematic structural diagram of fig. 4 from another view angle.

The utility model provides a workpiece fixing device, including support frame 1, location boss 2, the guide pillar 3 of breathing in, power unit 4 and clamp plate 5.

Specifically, the support frame 1 mainly plays a bearing role, and is used for arranging and supporting the positioning boss 2, the power mechanism 4 and the like. The positioning boss 2 is used for arranging a workpiece 9 and is arranged on the support frame 1, and the positioning boss 2 is provided with a channel hole 21 penetrating through the height of the positioning boss. The air suction guide post 3 can be lifted, and the air suction guide post 3 is in sliding fit with the channel hole 21 of the positioning boss 2, namely, the air suction guide post 3 moves up and down along the channel hole 21 when lifted; the air suction guide post 3 is provided with an air channel for air to pass through so as to fix the workpiece 9 and the positioning boss 2 by air suction when the shape of the workpiece 9 is processed. The first fixing seat 42 of the power mechanism 4 is mounted on the support frame 1, the output end of the power mechanism 4 is connected with the pressing plate 5 so as to drive the pressing plate 5 to move through the power mechanism 4, and the power mechanism 4 can drive the pressing plate 5 to switch between a working position and an idle position, wherein the working position of the pressing plate 5 refers to a position where the pressing plate 5 is pressed above the positioning boss 2, and the idle position of the pressing plate 5 refers to a position where the pressing plate 5 avoids the positioning boss 2; in addition, the pressure plate 5 is provided with a relief hole at a position corresponding to the passage hole 21.

After the workpiece 9 is positioned on the positioning boss 2, firstly processing the appearance of the workpiece 9, at this time, the air suction guide post 3 rises to a position flush with the top surface of the positioning boss 2 to suck air by utilizing an air passage of the air suction guide post 3, so that the workpiece 9 is adsorbed and fixed on the positioning boss 2; that is, when the shape of the workpiece 9 is processed, the workpiece 9 is fixed by the suction force in the air passage of the air suction guide post 3.

After the shape of the workpiece 9 is processed, a preset position of the workpiece 9 needs to be perforated, and it should be noted that after the workpiece 9 is positioned on the positioning boss 2, a position of the workpiece 9 to be perforated just aligns with the channel hole 21 of the positioning boss 2, so that when the workpiece 9 is perforated, the channel hole 21 can avoid a perforating tool, and a complete hole position can be ensured to be formed in the workpiece 9. It will be appreciated that the number of passage openings 21 is the same as the number of openings in the workpiece 9. At this time, the suction guide 3 descends to avoid interference with the boring tool. In addition, the power mechanism 4 acts to drive the pressing plate 5 to move to the working position, that is, the pressing plate 5 is pressed above the positioning boss 2, and since the position of the pressing plate 5 corresponding to the channel hole 21 is provided with the abdicating hole, the pressing plate 5 presses the position of the workpiece 9 except the position to be punched, and presses and fixes the workpiece 9, so as to punch holes on the workpiece 9.

Therefore, the utility model provides a workpiece fixing device can realize on a station that the absorption to work piece 9 is fixed and compress tightly fixedly, also promptly, makes work piece 9 in location boss 2 last time install the back, can realize that work piece 9 is fixed in outline processing and hole site processing twice process, ensures the overall dimension of work piece 9 to can guarantee the relative position precision between each hole site and the 9 appearance edges of work piece on the work piece 9.

It should be noted that, in this embodiment, the positioning manner of the workpiece 9 on the positioning boss 2 is not limited, and those skilled in the art can refer to the prior art, for example, by additionally providing a support, the support is matched with the positioning boss 2, so as to achieve complete positioning of the workpiece 9 on the positioning boss 2; of course, other limiting modes can be adopted, and are not described in detail herein.

In order to ensure sufficient air suction during the shape processing of the workpiece 9, on the basis of the above embodiment, the bottom end of the air suction guide post 3 is connected with the sealed air suction table 6, the sealed air suction table 6 is provided with an air suction cavity and a first air suction port 61 communicated with the air suction cavity, and an air passage of the air suction guide post 3 is communicated with the air suction cavity. That is, in the present embodiment, the sealed suction table 6 is additionally provided, and the suction amount is increased by the suction cavity of the sealed suction table 6, so that sufficient suction force is provided for the workpiece 9 when the workpiece 9 is subjected to contour machining, and the workpiece 9 is more firmly and reliably fixed.

In order to realize the lifting of the air suction guide post 3, a guide rod cylinder 7 is connected to the sealed air suction table 6 on the basis of the above embodiment. That is to say, this embodiment drives sealed air suction platform 6 through guide arm cylinder 7 and drives the guide pillar 3 that breathes in and go up and down to make sealed air suction platform 6 and the guide pillar 3 that breathes in go up and down together, so that realize the guide pillar 3 that breathes in and the top surface of location boss 2 state of parallel and level mutually or make guide pillar 3 that breathes in descend certain distance, in order to dodge the instrument of trompil when carrying out the trompil to work piece 9.

In addition, considering that the area of the fixed block at the tail end of the guide rod cylinder 7 is small, in order to enable the sealing air suction table 6 to be stressed uniformly and ensure the lifting stability of the sealing air suction table 6, on the basis of the above embodiment, the tail end of the guide rod cylinder 7 is connected with the switching push block 72, and the switching push block 72 is connected with the sealing air suction table 6. That is to say, this embodiment is through the switching effect of switching ejector pad 72, realizes being connected of sealed air suction platform 6 and guide arm cylinder 7, and then can come the reasonable size of design switching ejector pad 72 according to the concrete size of sealed air suction platform 6, for example, make the marginal dimension and the marginal shape of switching ejector pad 72 the same with the marginal dimension and the marginal shape of sealed air suction platform 6 to can make the better laminating contact of sealed air suction platform 6 and switching ejector pad 72, ensure that sealed air suction platform 6 atress is more balanced, the motion is more steady.

In order to limit the ascending limit position of the air suction guide post 3, on the basis of the above embodiment, the sealed air suction table 6 is provided with the limit guide post 62, and when the guide rod cylinder 7 drives the sealed air suction table 6 to ascend to the highest position, the limit guide post 62 is abutted against the preset position of the support frame 1. That is, in the present embodiment, the highest position at which the sealed suction table 6 ascends is limited by a mechanical limit manner, so that the highest position of the suction guide post 3 is limited. When the limiting guide post 62 abuts against the preset position of the support frame 1, the guide rod cylinder 7 cannot drive the sealing air suction table 6 to continuously rise, and the highest position of the sealing air suction table 6 is limited.

It should be noted that, in this embodiment, the specific number of the limiting guide pillars 62 is not limited, the number of the limiting guide pillars 62 may be one, or may also be at least two, preferably, the number of the limiting guide pillars 62 is two, and the two limiting guide pillars 62 are diagonally distributed.

In addition, considering that waste slag such as cutting chips is generated when the workpiece 9 is subjected to contour machining and the workpiece 9 is perforated, and meanwhile, the workpiece 9 needs to be cooled during the contour machining and the perforating of the workpiece 9, so that in order to avoid the waste slag from falling on the limit guide post 62 to cause inaccurate mechanical limit and prevent cooling liquid from entering the suction cavity and the like from the joint of the suction guide post 3 and the sealed suction table 6, as a preferable scheme, on the basis of the above embodiment, the support frame 1 is provided with the protection cover 8, and when the guide rod cylinder 7 drives the sealed suction table 6 to rise to the highest position, the sealed suction table 6 is positioned in the protection cover 8. That is to say, this embodiment protects sealed platform 6 of inhaling through setting up the protection casing 8 at support frame 1, and when sealed platform 6 of inhaling rises to the highest position, the protection casing 8 encloses the peripheral part of locating sealed platform 6 of inhaling, can avoid the waste material sediment to fall on spacing guide pillar 62 to can prevent that coolant liquid etc. from getting into sealed platform 6 of inhaling, thereby can guarantee to carry out the accuracy that machinery was spacing to sealed platform 6 of inhaling highest position, reach waterproof effect simultaneously.

It should be noted that, in the above embodiments, the motion form output by the power mechanism 4 is not specifically limited, that is, the motion track of the pressure plate 5 is not specifically limited, as long as the pressure plate 5 can be switched between the working position and the idle position. For example, the power mechanism 4 can drive the pressing plate 5 to move along the X-axis, the Y-axis and the Z-axis of the rectangular spatial coordinate system, so as to realize the position switching of the pressing plate 5; the position switching of the pressure plate 5 can also be realized by driving the pressure plate 5 to rotate in the horizontal plane and to lift in the vertical direction.

In view of the convenience of the movement of the pressing plate 5, the power mechanism 4 includes a rotary cylinder 41 having a lifting function on the basis of the above-described embodiment. That is, the present embodiment realizes the position switching of the platen 5 by the rotary cylinder 41 driving the platen 5 to rotate and ascend and descend. Specifically, when the workpiece 9 needs to be perforated after the contour machining of the workpiece 9 is completed, the platen 5 is driven by the rotary cylinder 41 to rotate above the positioning boss 2, and then the platen 5 is driven by the rotary cylinder 41 to descend to the working position. After the trompil is accomplished, through revolving cylinder 41 drive clamp plate 5 certain distance that rises earlier, drive clamp plate 5 again and rotate to idle position, the motion is simple, the control of being convenient for.

Further, in order to ensure that the pressing plate 5 has a more accurate working position, on the basis of the above embodiment, the bottom of the pressing plate 5 is provided with the limiting post 51, the supporting frame 1 is provided with the limiting hole 111, and when the pressing plate 5 is located at the working position, the limiting post 51 is matched with the limiting hole 111. That is to say, when revolving cylinder 41 drives clamp plate 5 and rotates to the top of location boss 2, spacing post 51 just aligns with spacing hole 111, and in revolving cylinder 41 driven clamp plate 5 descends to the in-process of operating position, spacing post 51 inserts in the spacing hole 111, utilizes spacing hole 111 to play the spacing effect of force machinery to spacing post 51 for ensure that clamp plate 5 has more accurate operating position.

In the above embodiments, the specific structure of the support frame 1 is not limited as long as it can support. Preferably, on the basis of the above embodiment, the supporting frame 1 includes a boss fixing panel 11, a mounting base plate 12 and a side plate 13. The positioning boss 2 is fixedly arranged on the boss fixing panel 11, the first fixing seat 42 of the power mechanism 4 is arranged on the mounting base plate 12, and the side plate 13 is connected between the boss fixing panel 11 and the mounting base plate 12, so that the boss fixing panel 11, the mounting base plate 12 and the side plate 13 form an integral supporting structure.

When the guide rod cylinder 7 drives the sealed air suction table 6 to drive the air suction guide post 3 to lift, the second fixed seat 71 of the guide rod cylinder 7 is also installed on the installation bottom plate 12.

Preferably, the side plate 13 is circumferentially closed, that is, the side plate 13, the boss fixing panel 11 and the mounting base plate 12 form an inner closed space, so that the rotating cylinder 41, the guide rod cylinder 7, the sealed air suction table 6, the air suction guide post 3 and the protective cover 8 are located in the space enclosed by the side plate 13, thereby avoiding the parts from being exposed to the outside. For example, as shown in fig. 3, the side plate 13 includes a lateral connecting plate and a lateral cover plate, the upper and lower ends of the lateral connecting plate are fixed to the boss fixing panel 11 and the mounting base plate 12, respectively, and the lateral cover plate is fixed to the lateral connecting plate.

In addition, in order to further ensure the fixing firmness of the workpiece 9, on the basis of the above embodiment, the positioning boss 2 is further provided with the air suction duct 22 extending along the height direction thereof and the second air suction port 23 communicating with the air suction duct 22. That is to say, in the embodiment, the positioning boss 2 is additionally provided with the air suction duct 22 and the second air suction port 23 to supplement the air suction amount, and when the shape of the workpiece 9 is machined, the purpose of enhancing the adsorption and fixation of the workpiece 9 is achieved through the matching effect of the air suction duct 22 and the air passage of the air suction guide pillar 3. When the workpiece 9 is drilled, the second air suction port 23 can also be used for sucking air into the air suction duct 22, so that the workpiece 9 can be fixed more firmly under the combined action of the air suction duct 22 and the pressing plate 5.

In addition, in each of the above embodiments, the specific number of the positioning bosses 2 is not limited, and the number of the positioning bosses 2 may be one or at least two, and it can be understood that the greater the number of the positioning bosses 2 is, the greater the number of the machining bits for the workpiece 9 is, and the simultaneous machining of a plurality of workpieces 9 can be realized, so as to improve the machining efficiency.

It should be noted that the number of the pressing plates 5 is the same as that of the positioning bosses 2, and the pressing plates 5 correspond to the positioning bosses 2 one to one. Preferably, the positioning bosses 2 are circumferentially distributed uniformly, so that each pressure plate 5 can be rotated by the same angle each time, and the pressure plates 5 are simultaneously located in their respective working or idle positions.

In addition, in view of the simplicity of construction, it is preferred that all the pressure plates 5 are of unitary construction, i.e. that the pressure plates 5 are radially disposed along the output end of the power mechanism 4.

It should be further noted that, in the above embodiments, the number of the suction guide posts 3 may be the same as the number of the passage holes 21, or may be different from the number of the passage holes 21, that is, some of the passage holes 21 are provided with the suction guide posts 3, and some of the passage holes 21 are not provided with the suction guide posts 3.

Except the workpiece fixing device, the utility model also provides a numerical control machining device including the workpiece fixing device disclosed by the above embodiment, and the structure of other parts of the numerical control machining device please refer to the prior art, which is not repeated herein.

It will be understood that the numerical control machining apparatus has a machining tool for performing a contour machining of the workpiece 9 and a boring tool for boring the workpiece 9, see in particular the prior art.

The emphasis of this embodiment is: by adopting the workpiece fixing device disclosed by any one of the embodiments, the workpiece 9 can be adsorbed, fixed and pressed and fixed on one station, namely, after the workpiece 9 is mounted on the positioning boss 2 for one time, the workpiece 9 can be fixed in two procedures of profile machining and hole site machining, the profile dimension of the workpiece 9 is ensured, the relative position precision between each hole site on the workpiece 9 and the profile edge of the workpiece 9 can be ensured, the machining precision is high, and the machining efficiency is high.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It is right above the utility model provides a work piece fixing device and numerical control processing equipment have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A workpiece holding device, comprising:

a support frame (1);

the positioning boss (2) is arranged on the support frame (1), and the positioning boss (2) is provided with a channel hole (21) penetrating through the height of the positioning boss;

the liftable air suction guide post (3) is in sliding fit with the channel hole (21), and the air suction guide post (3) is provided with an air passage;

locate power unit (4) of support frame (1) and with clamp plate (5) that the output of power unit (4) links to each other, clamp plate (5) are used for corresponding the position of passageway hole (21) is equipped with the hole of stepping down, power unit (4) drive clamp plate (5) switch between operating position and idle position, wherein, operating position does clamp plate (5) press to be located the position of location boss (2) top, the idle position does clamp plate (5) dodge the position of location boss (2).

2. The workpiece fixing device as recited in claim 1, characterized in that a sealed suction table (6) is connected to the bottom end of the suction guide post (3), the sealed suction table (6) is provided with a suction cavity and a first suction port (61) communicated with the suction cavity, and the air passage is communicated with the suction cavity.

3. Workpiece fixture device according to claim 2, characterised in that a guide rod cylinder (7) is connected to the sealing suction table (6).

4. The workpiece fixing device according to claim 3, characterized in that the sealing air suction table (6) is provided with a limiting guide post (62), and when the guide rod cylinder (7) drives the sealing air suction table (6) to ascend to the highest position, the limiting guide post (62) is abutted against the preset position of the support frame (1).

5. The workpiece fixing device according to claim 4, characterized in that the supporting frame (1) is provided with a protective cover (8), and when the guide rod cylinder (7) drives the sealing air suction table (6) to ascend to the highest position, the sealing air suction table (6) is positioned in the protective cover (8).

6. Workpiece fixture device according to any of claims 1-5, characterised in that the power unit (4) comprises a rotary cylinder (41) with a lifting function.

7. The workpiece fixing device according to claim 6, wherein a limiting post (51) is arranged at the bottom of the pressure plate (5), a limiting hole (111) is arranged on the support frame (1), and when the pressure plate (5) is located at the working position, the limiting post (51) is matched with the limiting hole (111).

8. A workpiece fixture device as claimed in any one of claims 1-5, characterised in that the support frame (1) comprises:

the boss fixing panel (11), the positioning boss (2) is fixedly arranged on the boss fixing panel (11);

the mounting base plate (12), and a first fixed seat (42) of the power mechanism (4) is mounted on the mounting base plate (12);

and the side plate (13) is connected between the boss fixing panel (11) and the mounting bottom plate (12).

9. The workpiece fixture device according to any of claims 1-5, characterized in that the positioning boss (2) is further provided with a suction duct (22) extending in the height direction thereof and a second suction port (23) communicating with the suction duct (22).

10. A numerical control machining apparatus comprising the workpiece holding device according to any one of claims 1 to 9.

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