CN214290902U - Automatic workpiece fixing clamp and machining equipment - Google Patents

Abstract

The utility model discloses an automatic mounting fixture of work piece and processing equipment relates to machine-building technical field. Including the fixing base, and set up location chuck on the fixing base, the fixing base is provided with still be provided with a plurality of centre gripping subassemblies of circumference array on location chuck's the installation face, wherein, location chuck is used for placing the work piece, the automatic mounting fixture of work piece still includes drive assembly, drive assembly is through setting up transmission assembly in the fixing base with the transmission of centre gripping subassembly is connected, but the centre gripping subassembly driven axial clamp is tight or is loosened the work piece. The consistency of clamping force can be improved, the deformation of the workpiece is avoided, and the efficiency of workpiece clamping and fixing is improved.

Description

Automatic workpiece fixing clamp and machining equipment

Technical Field

The utility model relates to a machine-building technical field particularly, relates to an automatic mounting fixture of work piece and processing equipment.

Background

The self-centering three-jaw chuck is a matched fixture arranged at the front end of a lathe spindle, and has the basic structure that an inner disc wire with a bevel gear disc arranged on the bottom surface is arranged in a chuck body, the bevel gear disc is meshed with a linkage bevel gear arranged on the side surface of the chuck body, jaws capable of sliding are respectively arranged in three clamping grooves on the front end surface of the chuck body, and thread teeth on the bottom surface of each jaw are meshed with Archimedes spiral lines in front of the inner disc wire. Therefore, when the wrench is inserted into the central hole of the linkage bevel gear on the side surface of the chuck body and is driven to rotate, the linkage bevel gear drives the bevel gear disc to rotate the inner disc wire, and then the three clamping claws are driven to synchronously move centripetally or centrifugally, so that the purpose of clamping workpieces is realized.

By adopting the mode, when a workpiece is clamped and fixed, the wrench needs to be manually inserted into the central hole of the linkage bevel gear on the side surface of the chuck body and rotates to fasten the workpiece, the locking force cannot guarantee the consistency for large thin-wall parts, the force is too small, the workpiece is easy to fall off, and the workpiece is easy to deform and the machining precision is influenced due to too large force. And the clamping and fixing process is complicated, and the processing efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic mounting fixture of work piece and processing equipment can promote the uniformity of the tight dynamics of clamp and avoid the deformation of work piece to promote the fixed efficiency of work piece clamping.

The embodiment of the utility model is realized like this:

the embodiment of the utility model provides an aspect provides an automatic mounting fixture of work piece, including the fixing base, and set up positioning chuck on the fixing base, the fixing base is provided with still be provided with a plurality of centre gripping subassemblies of circumference array on positioning chuck's the installation face, wherein, positioning chuck is used for placing the work piece, the automatic mounting fixture of work piece still includes drive assembly, drive assembly is through setting up transmission assembly in the fixing base with the transmission of centre gripping subassembly is connected, but the centre gripping subassembly is driven the axial and is pressed from both sides tightly or loosen the work piece.

Optionally, the centre gripping subassembly is including setting up reference column on the fixing base, and with locating column articulated briquetting, the storage tank has been seted up on the briquetting, the spout has been seted up respectively on the relative both sides wall of storage tank, the centre gripping subassembly still include with the telescopic link that transmission assembly connects, the telescopic link is worn to locate the installation face, just the one end of telescopic link is located in the storage tank and with spout sliding connection.

Optionally, a flexible cushion block is further arranged on the pressing block, and the flexible cushion block is used for abutting against the workpiece.

Optionally, the positioning chuck is further provided with an auxiliary positioning assembly, the auxiliary positioning assembly comprises a positioning seat and a positioning shaft penetrating through the positioning seat, and an elastic piece matched with the positioning shaft is further arranged in the positioning seat, so that one end of the positioning shaft has elastic force extending out of the positioning seat and can be abutted against the workpiece.

Optionally, the driving assembly includes a cavity, a cylinder body and a piston rod, a first pipeline and a second pipeline are connected to the side wall of the cavity, one end of the cylinder body is inserted into the cavity, the piston rod is disposed in the cylinder body and slidably connected to the cylinder body, a first flow passage communicated with the first pipeline and a second flow passage communicated with the second pipeline are disposed on the cylinder body, the first flow passage is communicated with the rod cavity of the cylinder body, and the second flow passage is communicated with the rod-free cavity of the cylinder body.

Optionally, a first sealing element and a second sealing element are arranged between the cavity and the cylinder body, and the first sealing element and the second sealing element are respectively located on two sides of the inlet of the second pipeline, so that media flowing in the first pipeline and the second pipeline are isolated from each other.

Optionally, a bearing is further disposed between the cavity and the cylinder body, an outer ring of the bearing abuts against an inner wall of the cavity, and an inner ring of the bearing abuts against an outer wall of the cylinder body.

Optionally, one end of the piston rod, which is far away from the cylinder body, is connected with the transmission assembly to drive the transmission assembly to reciprocate.

Optionally, the transmission assembly comprises a connecting piece fixedly connected with the piston rod, the connecting piece is provided with a plurality of connecting rods, and the connecting rods are in one-to-one correspondence with the telescopic rods of the clamping assembly.

In another aspect of the embodiments of the present application, there is provided a machining apparatus including the automatic workpiece fixing clamp as described in any one of the above.

The utility model discloses beneficial effect includes:

the automatic fixing clamp for the workpiece and the processing equipment provided by the embodiment of the application can automatically clamp the workpiece through the positioning chuck arranged on the fixing seat and the plurality of clamping assemblies arranged on the mounting surface of the fixing seat provided with the positioning chuck in a circumferential array mode, and do not need to manually clamp and fix the workpiece. The clamping assembly is driven by the driving assembly to act in the process of clamping the workpiece through the clamping assembly, the clamping force applied to the workpiece can be kept consistent in the clamping process, and the problems that the workpiece is easy to fall off due to the fact that the clamping force is too small in the manual clamping process or the workpiece is easy to deform due to too large clamping force can be avoided. Meanwhile, the driving assembly is in transmission connection with the clamping assembly through the transmission assembly arranged in the fixed seat, so that the clamping assembly can axially clamp or loosen a workpiece, automation of clamping or loosening of the workpiece is realized, and the problem that the machining precision is influenced due to the fact that the workpiece is radially deformed when the workpiece is subjected to radial clamping force in a traditional clamping mode can be solved. By adopting the above mode, the consistency of clamping force can be improved, the deformation of the workpiece is avoided, and the efficiency of workpiece clamping and fixing is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of an automatic workpiece fixing clamp according to an embodiment of the present invention;

fig. 2 is a second schematic structural view of an automatic workpiece fixing clamp according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic structural diagram of the positioning chuck and the auxiliary positioning assembly according to the embodiment of the present invention.

Icon: 100-automatic fixture fixation of the workpiece; 105-a workpiece; 110-a fixed seat; 112-a connecting plate; 114-a housing; 116-a mounting surface; 120-a positioning chuck; 122-incision; 130-a clamping assembly; 131-a positioning column; 132-briquetting; 133-a receiving groove; 134-a chute; 135-a telescopic rod; 136-a flexible pad block; 140-a drive assembly; 141-a cavity; 1412-a first conduit; 1414-a second conduit; 1416-a first seal; 1418-a second seal; 1419-bearings; 142-a cylinder body; 1422 — first flow path; 1424-second flow path; 1426 — rod cavity; 1428 — rodless cavity; 143-a piston rod; 150-a transmission assembly; 152-a connector; 154-connecting rod; 160-an auxiliary positioning assembly; 162-positioning seat; 164-positioning the shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The automatic workpiece fixing clamp 100 provided by the embodiment of the application is mainly used for machining inner holes of large thin-wall cylindrical parts. In a traditional clamping and fixing mode, the jaws of the three-jaw chuck synchronously and radially move towards the center so as to clamp the workpiece 105. However, for large thin-wall parts, the locking force cannot ensure consistency, the force is too small, the workpiece 105 is easy to fall off, and the force is too large, the workpiece 105 is easy to deform, and the machining precision is affected. And the clamping and fixing process is complicated, and the processing efficiency is influenced. In addition, in the machining process, due to the deformation of the workpiece 105, not only is the prop loss caused too fast, but also the qualified rate of the machined product is low, so that the reliable and efficient machining of the workpiece 105 is not facilitated.

Referring to fig. 1 and fig. 2, the present embodiment provides an automatic workpiece fixing clamp 100, which includes a fixing base 110 and a positioning chuck 120 disposed on the fixing base 110, wherein a plurality of circumferentially arrayed clamping assemblies 130 are further disposed on a mounting surface 116 of the fixing base 110 on which the positioning chuck 120 is disposed, the positioning chuck 120 is used for placing a workpiece 105, the automatic workpiece fixing clamp 100 further includes a driving assembly 140, the driving assembly 140 is in transmission connection with the clamping assemblies 130 through a transmission assembly 150 disposed in the fixing base 110, and the clamping assemblies 130 are driven to axially clamp or loosen the workpiece 105.

Specifically, the fixing base 110 is mainly used for connecting a spindle of a lathe and has a supporting function, and the positioning chuck 120 arranged on the fixing base 110 can be used for preliminarily positioning the workpiece 105 on the positioning chuck 120, so that the plurality of clamping assemblies 130 circumferentially arranged in an array on the mounting surface 116 of the fixing base 110 synchronously act to clamp and fix the workpiece 105, and subsequent operations such as inner hole machining are facilitated. In the process of clamping the workpiece 105, manual clamping is not needed, and only the driving assembly 140 is operated to drive the clamping assembly 130 to move, so that the purpose of clamping the workpiece 105 is achieved.

It will be appreciated that a drive assembly 150 is provided within the holder 110 to allow simultaneous movement of the clamping assemblies 130 to clamp the workpiece 105. To facilitate installation and maintenance of the transmission assembly 150, the fixing base 110 may employ the connecting plate 112 and the housing 114 which are detachably connected, wherein the connecting plate 112 and the housing 114 may employ a circular structure so as to be more stable when the fixing base 110 rotates along with the main shaft.

It should be noted that, in the embodiment of the present application, the number of the clamping assemblies 130 is not particularly limited, and may be flexibly set according to the size of the workpiece 105, for example, the number of the clamping assemblies 130 may be set to 3 to 8, such as 3, 4, or 6. By adopting the mode, the workpiece 105 can be stressed more evenly, and the clamping is more stable and reliable.

The automatic workpiece fixing clamp 100 provided by the embodiment of the application can automatically clamp the workpiece 105 through the positioning chuck 120 arranged on the fixing seat 110 and the plurality of clamping assemblies 130 arranged in a circumferential array on the mounting surface 116 of the fixing seat 110 provided with the positioning chuck 120, and does not need to manually clamp and fix the workpiece. In the process of clamping the workpiece 105 through the clamping assembly 130, the clamping assembly 130 is driven by the driving assembly 140 to act, so that the clamping force applied to the workpiece 105 can be kept consistent in the clamping process, and the problems that the workpiece 105 is easy to fall off due to too small clamping force in the manual clamping process, or the workpiece 105 is easy to deform due to too large clamping force and the like can be solved. Meanwhile, the driving assembly 140 is in transmission connection with the clamping assembly 130 through the transmission assembly 150 arranged in the fixed seat 110, so that the clamping assembly 130 can axially clamp or loosen the workpiece 105, and when the workpiece 105 is automatically clamped or loosened, the problem that the machining precision is affected due to the radial deformation of the workpiece 105 when the workpiece 105 is subjected to a radial clamping force in a traditional clamping mode can be avoided. By adopting the mode, the consistency of clamping force can be improved, the deformation of the workpiece 105 is avoided, and the clamping and fixing efficiency of the workpiece 105 is improved.

As shown in fig. 1 and 3, the clamping assembly 130 includes a positioning pillar 131 disposed on the fixing base 110, and a pressing block 132 hinged to the positioning pillar 131, the pressing block 132 is provided with an accommodating groove 133, two opposite side walls of the accommodating groove 133 are respectively provided with a sliding groove 134, the clamping assembly 130 further includes an expansion link 135 connected to the transmission assembly 150, the expansion link 135 penetrates through the mounting surface 116, and one end of the expansion link 135 is located in the accommodating groove 133 and slidably connected to the sliding groove 134.

Specifically, through the positioning column 131 arranged on the fixing seat 110, when the pressing block 132 is hinged to the positioning column 131, a certain distance may be provided between the pressing block 132 and the mounting surface 116, which is beneficial to positioning the pressing block 132 at an end surface of the workpiece 105 far away from the positioning chuck 120, so as to clamp or loosen the workpiece 105. Through the containing groove 133 formed on the pressing block 132 and the sliding grooves 134 formed on the two opposite side walls of the containing groove 133, one end of the telescopic rod 135 can be located in the containing groove 133 and slidably connected with the sliding grooves 134. The pressing block 132 and the positioning column 131 can be connected through a pin shaft, the sliding groove 134 and the telescopic rod 135 can also be connected through a pin shaft, when the telescopic rod 135 extends out of or retracts into the mounting surface 116, the pressing block 132 is driven to rotate, the pin shaft connected with the sliding groove 134 slides in the sliding groove 134, and when the pressing block 132 and the positioning column 131 rotate relatively, the free end of the pressing block 132 is close to or far away from the positioning chuck 120, so that the workpiece 105 can be clamped or loosened axially.

As shown in fig. 3, the pressing block 132 is further provided with a flexible pad 136, and the flexible pad 136 is used for abutting against the workpiece 105. The flexible pad 136 may be made of nylon, rubber, or resin, so as to prevent the pressing block 132 from being unable to adhere to the workpiece 105 or causing an impression on the workpiece 105 during the process of clamping the workpiece 105. By adopting the mode, the axial force application on the workpiece 105 is ensured, and meanwhile, the clamping stability is ensured.

As shown in fig. 4, the positioning chuck 120 is further provided with an auxiliary positioning assembly 160, the auxiliary positioning assembly 160 includes a positioning seat 162 and a positioning shaft 164 passing through the positioning seat 162, and an elastic member engaged with the positioning shaft 164 is further disposed in the positioning seat 162, so that one end of the positioning shaft 164 has an elastic force extending out of the positioning seat 162 and can abut against the workpiece 105.

Specifically, the elastic member may be an elastic sheet or a compression spring, and the positioning shaft 164 may be provided with a protrusion, so that the positioning shaft 164 may be prevented from being separated from the positioning seat 162, and on the other hand, the elastic member may be conveniently connected with the positioning seat 162 in a matching manner. A plug coupled to the positioning seat 162 may be further disposed on the positioning seat 162 to facilitate the assembly between the positioning seat 162 and the positioning shaft 164, and to facilitate the force assistance of the elastic member, so that one end of the positioning shaft 164 has an elastic force extending out of the positioning seat 162. By the auxiliary positioning assembly 160 arranged on the positioning chuck 120, when the workpiece 105 is placed on the positioning chuck 120, the positioning shaft 164 can abut against the side wall of the workpiece 105, which is beneficial to the centering operation of the workpiece 105. It should be noted that, in the embodiment of the present application, the number of the auxiliary positioning assemblies 160 is not particularly limited, and may be flexibly set according to the size of the workpiece 105, for example, the number of the auxiliary positioning assemblies 160 may be set to 3 to 8, such as 3, 4, or 6. By adopting the mode, the stress of the workpiece 105 can be more balanced, and the centering effect is better.

In addition, referring to fig. 4, a plurality of notches 122 are further disposed on the outer ring of the positioning chuck 120, so that a part of the edge of the workpiece 105 can be exposed out of the positioning chuck 120 at the buckling and abutting position of the workpiece 105 and the positioning chuck 120, thereby facilitating the operation of taking out the workpiece 105 after the machining is completed. Meanwhile, through the plurality of notches 122 arranged on the outer ring of the positioning chuck 120, the notches 122 correspond to the clamping assembly 130, the clamping assembly 130 can be abducted, the mutual matching is more compact, the occupied space of the shell 114 is reduced, the length of the pressing block 132 is shortened, the expansion link 135 is reduced, the pressing block 132 generates plastic deformation due to the acting force of the transmission assembly 150, and meanwhile, the clamping force of the flexible cushion block 136 on the workpiece 105 can be increased.

As shown in fig. 2, the driving assembly 140 includes a cavity 141, a cylinder 142 and a piston rod 143, a first conduit 1412 and a second conduit 1414 are respectively connected to sidewalls of the cavity 141, one end of the cylinder 142 is inserted into the cavity 141, the piston rod 143 is disposed in the cylinder 142 and slidably connected to the cylinder 142, a first flow passage 1422 communicated with the first conduit 1412 and a second flow passage 1424 communicated with the second conduit 1414 are disposed on the cylinder 142, the first flow passage 1422 is communicated with a rod chamber 1426 of the cylinder 142, and the second flow passage 1424 is communicated with a rod-free chamber 1428 of the cylinder 142.

Specifically, the cavity 141 is fixedly arranged in the processing equipment, the cylinder 142 rotates synchronously with a main shaft of the processing equipment, and the cavity 141 and the cylinder 142 are connected in a rotating manner. The cavity 141 has a first conduit 1412 and a second conduit 1414 connected to sidewalls thereof, respectively, the first flow passage 1422 of the cylinder 142 may communicate with the first conduit 1412 through an end of the cylinder 142, and the second flow passage 1424 of the cylinder 142 may communicate with the second conduit 1414 through a sidewall of the cylinder 142. The extension rod 135 includes a piston disposed within a cylinder 142, and a push-pull rod connected to the piston, which divides the cylinder 142 into a rod chamber 1426 and a rodless chamber 1428. In this way, the piston rod 143 can be driven to move by the pressure difference between the rod chamber 1426 and the rod-less chamber 1428, so that the clamping assembly 130 is driven to move by the transmission assembly 150 disposed in the fixing base 110.

With continued reference to fig. 2, a first sealing element 1416 and a second sealing element 1418 are disposed between the cavity 141 and the cylinder 142, and the first sealing element 1416 and the second sealing element 1418 are respectively disposed on both sides of the inlet of the second channel 1414 to isolate the media flowing in the first channel 1412 and the second channel 1414 from each other.

Specifically, the form of the first sealing element 1416 and the second sealing element 1418 is not particularly limited in the embodiments of the present application, and for example, the first sealing element 1416 and the second sealing element 1418 may be in the form of a sealing ring or a skeleton seal, as long as the required stability of the seal can be ensured. Since the first and second seals 1416 and 1418 are disposed on both sides of the inlet of the second pipe 1414, an annular space is formed between the first and second seals 1416 and 1418, and the second pipe 1414 can be effectively communicated with the second flow passage 1424 regardless of any angle of rotation of the cylinder 142. In addition, because the first sealing element 1416 is positioned on the first pipeline 1412 and the second pipeline 1414, media flowing in the first pipeline 1412 and the second pipeline 1414 can be isolated, so that stable connection of the connection passage can be ensured.

It should be noted that, in the embodiment of the present application, a medium used is not particularly limited, for example, the medium may be hydraulic oil, and when hydraulic oil is used, the cylinder 142 may be a hydraulic cylinder. Likewise, the medium may be compressed air, and when compressed air is used, the cylinder 142 may be a pneumatic cylinder.

As shown in fig. 2, a bearing 1419 is further disposed between the cavity 141 and the cylinder 142, an outer ring of the bearing 1419 abuts against an inner wall of the cavity 141, and an inner ring of the bearing 1419 abuts against an outer wall of the cylinder 142. Thus, when the cylinder 142 and the cavity 141 rotate relatively, the cylinder 142 can rotate more smoothly, and noise generated during rotation can be reduced.

As shown in fig. 2, an end of the piston rod 143 away from the cylinder 142 is connected to the transmission assembly 150 to drive the transmission assembly 150 to reciprocate. Specifically, when the piston rod 143 and the cylinder 142 slide relatively, the transmission assembly 150 is driven to move synchronously, so that the transmission assembly 150 reciprocates, and the transmission assembly 150 is connected to the telescopic rod 135, so as to drive the telescopic rod 135 to move, and finally, the workpiece 105 is clamped or loosened.

As shown in fig. 1 and 2, the driving assembly 150 includes a connecting member 152 fixedly connected to the piston rod 143, the connecting member 152 is provided with a plurality of connecting rods 154, and the connecting rods 154 are disposed in one-to-one correspondence with the telescopic rods 135 of the clamping assembly 130.

Specifically, the connecting member 152 and the piston rod 143 may be fixed by a thread or a snap, which is not limited in this embodiment. By arranging a plurality of connecting rods 154 on the connecting member 152, the connecting rods 154 are arranged in one-to-one correspondence with the telescopic rods 135 of the clamping assembly 130. When the telescopic link 135 drives the connecting piece 152 to move, the connecting piece 152 drives the connecting rod 154 to move, thereby enabling the telescopic link 135 connected with the connecting rod 154 to move synchronously, so as to clamp or loosen the workpiece 105, in the whole operation process, the action switch connected with the driving component 140 can be controlled through the action switch, the clamping is not required to be carried out by manpower, the consistency and the reliability of the clamping force of the workpiece 105 can be ensured, the problem of too large or too small force during manual clamping can be avoided, and the efficiency of clamping and fixing the workpiece 105 can be improved.

The embodiment of the utility model provides a still disclose a processing equipment, including the automatic mounting fixture 100 of work piece in the aforementioned embodiment. The processing apparatus includes the same structure and advantageous effects as the automatic workpiece fixing jig 100 in the foregoing embodiment. The structure and advantages of the automatic workpiece fixing clamp 100 have been described in detail in the foregoing embodiments, and are not described in detail herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides an automatic mounting fixture of work piece, its characterized in that, includes the fixing base, and sets up location chuck on the fixing base, the fixing base is provided with still be provided with a plurality of centre gripping subassemblies of circumference array on location chuck's the installation face, wherein, location chuck is used for placing the work piece, automatic mounting fixture of work piece still includes drive assembly, drive assembly is through setting up transmission assembly in the fixing base with the transmission of centre gripping subassembly is connected, but the centre gripping subassembly driven axial presss from both sides tightly or unclamps the work piece.

2. The automatic workpiece fixing clamp according to claim 1, wherein the clamping assembly comprises a positioning post disposed on the fixing seat, and a pressing block hinged to the positioning post, wherein a containing groove is formed in the pressing block, sliding grooves are formed in two opposite side walls of the containing groove, respectively, the clamping assembly further comprises a telescopic rod connected to the transmission assembly, the telescopic rod penetrates through the mounting surface, and one end of the telescopic rod is located in the containing groove and is slidably connected to the sliding grooves.

3. The automatic workpiece fixing clamp of claim 2, wherein the pressing block is further provided with a flexible cushion block, and the flexible cushion block is used for abutting against the workpiece.

4. The automatic workpiece fixing clamp according to claim 1, wherein the positioning chuck is further provided with an auxiliary positioning assembly, the auxiliary positioning assembly comprises a positioning seat and a positioning shaft penetrating through the positioning seat, and an elastic member engaged with the positioning shaft is further disposed in the positioning seat, so that one end of the positioning shaft has an elastic force extending out of the positioning seat and can abut against the workpiece.

5. The automatic workpiece fixing clamp according to any one of claims 1 to 4, wherein the driving assembly comprises a cavity, a cylinder body and a piston rod, a first pipeline and a second pipeline are respectively connected to the side wall of the cavity, one end of the cylinder body is inserted into the cavity, the piston rod is arranged in the cylinder body and is slidably connected with the cylinder body, a first flow passage communicated with the first pipeline and a second flow passage communicated with the second pipeline are arranged on the cylinder body, the first flow passage is communicated with the rod cavity of the cylinder body, and the second flow passage is communicated with the rodless cavity of the cylinder body.

6. The automatic workpiece fixing clamp according to claim 5, wherein a first sealing element and a second sealing element are arranged between the cavity and the cylinder body, and the first sealing element and the second sealing element are respectively positioned at two sides of the inlet of the second pipeline so as to isolate media flowing in the first pipeline and the second pipeline from each other.

7. The automatic workpiece fixing clamp according to claim 5, wherein a bearing is further arranged between the cavity and the cylinder body, an outer ring of the bearing abuts against an inner wall of the cavity, and an inner ring of the bearing abuts against an outer wall of the cylinder body.

8. The automatic workpiece fixing clamp according to claim 5, wherein one end of the piston rod, which is far away from the cylinder body, is connected with the transmission assembly so as to drive the transmission assembly to reciprocate.

9. The automatic workpiece fixing clamp according to claim 8, wherein the transmission assembly comprises a connecting piece fixedly connected with the piston rod, a plurality of connecting rods are arranged on the connecting piece, and the connecting rods are arranged in one-to-one correspondence with the telescopic rods of the clamping assembly.

10. A machining apparatus comprising the automatic workpiece fixing jig according to any one of claims 1 to 9.

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