A fixture for precision engraving automation

Abstract

A clamp for precision engraving automated operations, comprising a module body with a workpiece placement position, a clamping unit located beside the workpiece placement position, a slot, an oblique guide hole and a proximity switch are provided beside the workpiece placement position, and a first and a second air pipe joint are provided on the side of the module body; the clamping unit comprises an oblique clamping mechanism and a cylinder integrated mechanism, the oblique clamping mechanism comprises a pressing claw, a linear bearing, an inclined guide rod fixedly connected to the pressing claw and inserted into the oblique guide hole to slide with the linear bearing, and a pressing block slidably mounted on the pressing claw, the pressing claw is provided with a guide hole and an oblique arm extending obliquely; the cylinder integrated mechanism comprises a sealing disk sealed and embedded in the slot, a piston rod penetrated by the sealing disk and provided with a piston disk at the bottom, the top of the piston rod penetrates the guide hole and is connected to the pressing block, the piston disk separates the area between the sealing disk and the bottom of the slot to form a first piston chamber connected to the first air pipe joint and a second piston chamber connected to the second air pipe joint.

Description

Technical Field

[0001] The utility model relates to the technical field of product fine carving, in particular to a clamp used for automatic fine carving operation. Background Art

[0002] CNC precision engraving is a process that uses small tools to finely engrave workpieces to obtain products with specific shapes and structures. Specifically, the fixture is fixed on a rotating table that can rotate at high speed, and a robot is used to grab and place the workpiece to be processed on the fixture. After the clamping mechanism of the fixture clamps the workpiece, the high-speed rotating workpiece is brought close to and contacts the tool to achieve cutting and engraving on the workpiece surface. Figure 1 The precision carving fixture shown is used to clamp the workpiece. Due to the limitation of its structure, its clamping mechanism can only move within a small range of travel in the upper and lower spaces. The clamping space available for operators to clamp the product is small, and they need to bypass the pressure plate to clamp the product. The clamping operation is inconvenient and due to the obstruction of vision, it is impossible to confirm whether the product is clamped in place. Secondly, there is a gap between the left and right guide pins and the cover plate of the above-mentioned precision carving fixture, which is prone to jamming of the clamping mechanism due to unbalanced friction force, thereby affecting the stability of the workpiece clamping and reducing the precision of the precision carving of the workpiece. Furthermore, the clamping mechanism of the above-mentioned precision carving fixture cannot avoid the loading of the robot arm, and it is difficult to adapt to the precision carving automation operation, which affects the precision carving efficiency of the workpiece. In addition, the above-mentioned precision carving fixture clamps the workpiece by adding a side push cylinder to improve the stability of the workpiece clamping, which makes the fixture structure complicated and cannot be streamlined, thereby increasing the cost of the fixture. Utility Model Content

[0003] Based on this, it is necessary to provide a fixture for precision carving automation operations that can avoid the product clamping position, reduce the difficulty of clamping and facilitate robot operation, have high movement accuracy and reliability, are not prone to jamming, and have a streamlined structure while clamping the workpiece to address the above-mentioned shortcomings.

[0004] A fixture for precision engraving automation operation, comprising a module body for fixed installation on a precision engraving machine rotating table and having a workpiece placement position on the upper surface, at least one clamping unit located beside the workpiece placement position, a slot located beside the workpiece placement position and extending along the height direction of the module body on the upper surface of the module body, an oblique guide hole opened beside the slot and extending obliquely and penetrating the upper surface and lower surface of the module body, a proximity switch fixed beside the slot, and a first air pipe joint and a second air pipe joint for connecting to an external air pressure device are provided on the side of the module body; the clamping unit comprises:

[0005] The oblique clamping mechanism comprises a clamping jaw, a linear bearing fixed in the oblique guide hole, an oblique guide rod fixed on the lower surface of the clamping jaw and inserted into the oblique guide hole to slide with the linear bearing, a clamping block slidably mounted on the upper surface of the clamping jaw and capable of approaching or moving away from the workpiece placement position, a guide hole penetrating the lower surface of the clamping jaw is provided in the sliding area of ​​the clamping block, and a side surface of the clamping jaw adjacent to the workpiece placement position is provided with an oblique arm extending obliquely and corresponding to the workpiece placement position to clamp the workpiece; and

[0006] The cylinder integrated mechanism comprises a sealing disk embedded in the slot and sealedly connected to the inner wall of the slot, a piston rod located below the pressure claw and passing through the sealing disk, and a piston disk fixed to the bottom end of the piston rod. The top end of the piston rod is fixedly connected to the pressure block via a connector passing through a guide hole. The piston disk separates the area between the sealing disk and the bottom of the slot to form a first piston chamber and a second piston chamber located below the first piston chamber. The first piston chamber is connected to the first air pipe joint via a first air passage passing through the side of the module body, and the second piston chamber is connected to the second air pipe joint via a second air passage passing through the side of the module body.

[0007] In one of the embodiments, a through hole is opened in the middle of the module body and penetrates the upper surface and the lower surface of the module body to form the workpiece placement position, and a workpiece placement plate is fixed in the through hole.

[0008] In one embodiment, the through hole includes a workpiece introduction portion and a plate mounting portion located below the workpiece introduction portion and connected to the workpiece introduction portion, the width of the workpiece introduction portion gradually decreases from top to bottom, and the width of the plate mounting portion gradually increases from top to bottom, and the workpiece placement plate is embedded in the plate mounting portion and is screwed to the module body.

[0009] In one of the embodiments, an oblique guide hole is provided on each side of the slot, a linear bearing is fixed in each oblique guide hole, the proximity switch is adjacent to the oblique guide hole on one side of the slot and is located next to the through hole, and the lower surface of the pressing block is relatively fixed with two inclined guide rods correspondingly inserted into the two oblique guide holes.

[0010] In one of the embodiments, a limiting groove extending along the length direction of the module body is formed on the upper surface of the pressing claw, the guide hole is formed at the bottom of the limiting groove and passes through the lower surface of the pressing claw, the pressing block is slidably embedded in the limiting groove, a limiting tube passing through the guide hole is fixed on the lower surface of the pressing block, a socket connected to the limiting tube is formed on the upper surface of the pressing block, and the pressing block is fixedly connected to the piston rod by a bolt which passes through the socket and the limiting tube in sequence and is inserted into the top of the piston rod.

[0011] In one embodiment, the inclined arm includes an inclined portion fixedly connected to the side wall of the pressure claw and parallel to the inclined guide rod, a pressing portion fixedly connected to the end of the inclined portion and extending along the length direction of the module body, and an elastic pressing piece for resisting the workpiece is fixed to the lower surface of the pressing portion.

[0012] In one of the embodiments, the annular side surface of the sealing disk is sleeved with a first sealing ring that seals with the inner wall of the slot, and the annular side surface of the piston disk is sleeved with a second sealing ring that seals with the inner wall of the slot. The sealing disk is provided with a through hole for passing the piston rod, and the through hole is embedded with a third sealing ring that seals with the piston rod; the inner wall of the slot is provided with an installation groove adjacent to the slot notch, and a retaining spring is embedded in the installation groove. The sealing disk is accommodated in the slot and the upper surface of the sealing disk abuts against the lower surface of the retaining spring.

[0013] In one of the embodiments, two or more clamping units arranged in a ring are provided on the module body, and two or more slots corresponding to the cylinder integrated mechanisms of each clamping unit, two or more proximity switches corresponding to the sides of each slot, and two or more oblique guide holes corresponding to the inclined guide rods of each clamping unit are provided on the side of the workpiece placement position.

[0014] In one of the embodiments, the fixture for precision engraving automated operation also includes a connecting turntable, which is fixedly connected to the side of the module body, and the connecting turntable is screwed to the rotating table of the precision engraving machine.

[0015] In one embodiment, a boss is provided on one side of the connecting turntable adjacent to the module body, two groups of clamping blocks are arranged opposite to each other on the boss, a slot is formed between the two groups of clamping blocks, one side of the module body is embedded in the slot and connected to the connecting turntable screw.

[0016] The clamp for precision engraving automation operation of the utility model includes the following beneficial effects:

[0017] 1) The original upper and lower clamping mechanism is designed as an oblique clamping mechanism, and the sliding cooperation between the inclined guide rod and the linear bearing is used to realize the oblique movement of the clamping claw relative to the horizontal direction, which can avoid the position where the operator clamps the product, reduce the difficulty of clamping and facilitate the operation of the robot.

[0018] 2) The sliding fit of the inclined guide rod and the linear bearing ensures the accuracy and reliability of the movement of the pressure claw. The clamping force on the workpiece can be increased by increasing the specifications of the cylinder integrated mechanism. There is no need to set up a side push cylinder, which simplifies the fixture structure while ensuring the clamping of the workpiece.

[0019] 3) By fixedly connecting the piston rod and the pressure block, and combining the sliding cooperation between the pressure block and the pressure claw, the sliding connection structure between the piston rod and the pressure claw is optimized, and surface contact dynamic friction is adopted to ensure the force balance of the pressure claw when the cylinder integrated mechanism is pressed down, thereby improving the stability of the workpiece clamping.

[0020] 4) The above-mentioned fixture can be matched with an automated manipulator and a loading fixture to realize automated loading and unloading production during workpiece fine carving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the existing fine carving jig and the rotating table;

[0022] Figure 2 This is a schematic diagram of the structure of the cooperation between the clamp and the rotating table in one embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of a clamp in one embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the exploded structure of a clamp in one embodiment of the utility model;

[0025] Figure 5 This is a schematic cross-sectional structure diagram of a clamp in one embodiment of the utility model;

[0026] Figure 6 This is a schematic cross-sectional structure diagram of a module body in one embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of a half-section structure of a module body in one embodiment of the utility model;

[0028] Figure 8 It is a structural schematic diagram of the oblique pressing mechanism in one embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] Please combine Figure 2-8The utility model discloses a fixture 10 for precision engraving automation operation, which can avoid the clamping position of the product, reduce the difficulty of clamping and facilitate the operation of the manipulator, has high motion accuracy and reliability, is not easy to get stuck, and has a simple structure while clamping the workpiece. The fixture includes a module body 100 for fixed installation on the rotary table 20 of the precision engraving machine and having a workpiece placement position on the upper surface, and at least one clamping unit located beside the workpiece placement position. The clamping unit is used to clamp the workpiece set in the workpiece placement position to achieve the positioning of the workpiece. The upper surface of the module body 100 is provided with a slot 110 located beside the workpiece placement position and extending along the height direction of the module body 100, an oblique guide hole 120 opened beside the slot 110 and extending obliquely and penetrating the upper and lower surfaces of the module body 100, and a proximity switch 130 fixed beside the slot 110. In this embodiment, the slot 110 and the oblique guide hole 120 beside the workpiece placement position are used to provide an installation position for the clamping unit, and the proximity switch 130 is used to detect whether the clamping unit has clamped the workpiece in place. The side of the module body 100 is provided with a first air pipe connector 140 and a second air pipe connector 150 for connecting to an external air pressure device. The first air pipe connector 140 and the second air pipe connector 150 are used to connect compressed gas from the external air pressure device to drive the cylinder integrated mechanism of the clamping unit to work, thereby providing a power source for clamping the workpiece.

[0031] The clamping unit includes an oblique clamping mechanism 200 and a cylinder integrated mechanism 300, wherein the oblique clamping mechanism 200 is used to move closer to or further away from the workpiece placement position, and to press down when approaching the workpiece on the workpiece placement position to clamp the workpiece. The cylinder integrated mechanism 300 is used to drive the pressing claw to slide obliquely on the module body 100. Since the oblique sliding of the pressing claw on the module body 100 can be decomposed into the lifting movement of the pressing block in the vertical direction and the sliding of the pressing block in the horizontal direction, when the cylinder integrated mechanism 300 drives the pressing claw to slide obliquely, the pressing claw can clamp or release the workpiece when lifting and lowering, and at the same time, the pressing claw can avoid the loading of the robot when sliding horizontally, so as to ensure the normal progress of the workpiece precision carving automation operation.

[0032] Specifically, the oblique clamping mechanism 200 includes a pressing claw 210, a linear bearing 220 fixed in the oblique guide hole 120, an oblique guide rod 230 fixed on the lower surface of the pressing claw 210 and inserted into the oblique guide hole 120 to slide with the linear bearing 220, a pressing block 240 slidably mounted on the upper surface of the pressing claw 210 and capable of approaching or moving away from the workpiece placement position, a guide hole 250 penetrating the lower surface of the pressing claw 210 is provided in the sliding area of ​​the pressing block 240, and a side surface of the pressing claw 210 adjacent to the workpiece placement position is provided with an oblique arm 260 that extends obliquely and corresponds to the workpiece placement position to clamp the workpiece. The oblique guide rod 230 is screwed to the lower surface of the pressing claw 210. The cylinder integrated mechanism 300 includes a sealing disk 310 embedded in the slot 110 and sealedly connected to the inner wall of the slot 110, a piston rod 320 located below the pressure claw 210 and passing through the sealing disk 310, and a piston disk 330 fixed to the bottom end of the piston rod 320. The top end of the piston rod 320 is fixedly connected to the pressure block 240 through a connecting piece passing through a guide hole 250. The piston disk 330 separates the area between the sealing disk 310 and the bottom of the slot 110 to form a first piston chamber 340 and a second piston chamber 350 located below the first piston chamber 340. The first piston chamber 340 is connected to the first air pipe joint 140 through a first air channel 341 passing through the side of the module body 100, and the second piston chamber 350 is connected to the second air pipe joint 150 through a second air channel 351 passing through the side of the module body 100. In this way, compressed gas can be introduced into the first piston chamber 340 through the first air pipe joint 140, so that the piston rod 320 moves toward the bottom of the slot 110, thereby driving the pressure claw 210 to press down to clamp the workpiece; compressed gas can be introduced into the second piston chamber 350 through the second air pipe joint 150, so that the piston rod 320 moves toward the bottom of the slot 110, thereby driving the pressure claw 210 to lift up to release the workpiece.

[0033] Since the piston rod 320 is fixedly connected to the pressing block 240, and the pressing block 240 is slidably matched with the pressing claw 210, the pressing block 240 has a tendency to move downward under the drive of the piston rod 320 during the descent of the piston rod 320, and the downward pulling force on the pressing block 240 can be decomposed into the force along the oblique guide hole 120. 0's axis downward thrust and the component force perpendicular to the thrust, since the pressure block 240 is in contact with the pressure claw 210, during the downward movement of the piston rod 320, the pressure block 240 will push the pressure claw 210 to move in the direction close to the workpiece placement position, and the pressure claw 210 will press down to clamp the workpiece; conversely, during the upward movement of the piston rod 320, the end face of the piston rod 320 will push the pressure claw 210 to move in the direction away from the workpiece placement position, and the pressure claw 210 will move up to release the workpiece. In addition, in the present embodiment, by setting the proximity switch 130, the relationship between the horizontal position of the end of the inclined arm 260 of the pressure claw 210 and its vertical height can be calculated in advance. Thus, when the proximity switch 130 senses that the end of the inclined arm 260 of the pressure claw 210 has moved horizontally to the preset position, it is judged that the pressure claw 210 has pressed the workpiece into place. In this way, the proximity switch 130 sends a signal to the controller of the engraving machine so that the controller controls the second air pipe joint 150 to stop continuing to supply compressed gas to the second piston chamber 350, thereby avoiding the problem of workpiece damage caused by excessive pressing force of the pressure claw 210 on the workpiece.

[0034] Please combine Figure 2-7 , a through hole 160 is provided in the middle of the module body 100, which penetrates the upper and lower surfaces of the module body 100 to form a workpiece placement position, and a workpiece placement plate 170 is fixed in the through hole 160, and the workpiece placement plate 170 is used to receive the workpiece. Further, the through hole 160 includes a workpiece introduction part and a plate body mounting part located below the workpiece introduction part and connected to the workpiece introduction part, the width of the workpiece introduction part gradually decreases from top to bottom, and the width of the plate body mounting part gradually increases from top to bottom, and the workpiece placement plate 170 is embedded in the plate body mounting part and is screwed to the module body 100. In other words, the upper and lower parts of the through hole 160 are respectively flared structures, and the width of the connection part between the workpiece introduction part and the plate body mounting part is smaller than the width of the other parts on the through hole 160. By designing the workpiece introduction part as a flared structure, the difficulty of placing the workpiece into the workpiece mounting position can be reduced; designing the plate body mounting part as a flared structure facilitates the rapid positioning and installation of the workpiece placement plate 170.

[0035] In one embodiment, the fixture 10 for precision engraving automation operation further includes a connecting turntable 400, which is fixedly connected to the side of the module body 100, and the connecting turntable 400 is screwed to the rotating table 20 of the precision engraving machine. Further preferably, a boss 410 is provided on the connecting turntable 400 adjacent to the module body 100, and two groups of clamping blocks 420 are arranged on the boss 410, and a slot 430 is formed between the two groups of clamping blocks 420, and one side of the module body 100 is embedded in the slot 430 and screwed to the connecting turntable 400. By arranging two groups of clamping blocks 420 on the connecting turntable 400 to form a slot 430, the side of the module body 100 can be inserted into the slot 430 to achieve the first repositioning of the module body 100 and the connecting turntable 400, and then the module body 100 and the connecting turntable 400 are connected to the side of the module body 100 by screws passing through the bottom surface of the slot 430 to achieve the second repositioning of the module body 100 and the connecting turntable 400, while improving the connection strength between the module body 100 and the connecting turntable 400, the assembly difficulty of the module body 100 and the connecting turntable 400 is reduced. In addition, in this embodiment, steps 101 can also be cut on the upper edge and the lower edge of the side of the module body 100, respectively, and the step 400 can be embedded in the slot 430 of the connecting turntable 400 and the module body 100 and the connecting turntable 400 are screwed to increase the contact area between the module body 100 and the connecting turntable 400, and further improve the connection strength between the two.

[0036] Please combine Figure 2-8 In order to improve the stability and reliability of the movement of the pressing claw 210, in one embodiment, an oblique guide hole 120 is provided on each side of the slot 110, and a linear bearing 220 is fixed in each oblique guide hole 120. The proximity switch 130 is adjacent to the oblique guide hole 120 on one side of the slot 110 and is located beside the through hole 160. Two oblique guide rods 230 correspondingly inserted into the two oblique guide holes 120 are relatively fixed on the lower surface of the pressing block 240. In this way, the pressing claw 210 is supported by the two oblique guide rods 230 on both sides of the piston rod 320, which can avoid the shaking of the pressing claw 210 and the unstable pressing of the workpiece caused by the uneven force on the pressing claw 210, thereby improving the stability and reliability of the movement of the pressing claw 210.

[0037] In one embodiment, the upper surface of the pressing claw 210 is provided with a limiting groove 270 extending along the length direction of the module body 100, and the length direction of the module body 100 is the sliding direction of the pressing claw 210 on the module body 100. The guide hole 250 is provided at the bottom of the limiting groove 270 and penetrates the lower surface of the pressing claw 210, and the pressing block 240 is slidably embedded in the limiting groove 270. The lower surface of the pressing block 240 is fixed with a limiting tube 241 penetrating the guide hole 250, and the upper surface of the pressing block 240 is provided with a plug hole 242 communicating with the limiting tube 241. The pressing block 240 is fixedly connected with the piston rod 320 by a bolt 243 which is sequentially penetrated through the plug hole 242 and the limiting tube 241 and inserted into the top of the piston rod 320, and the limiting tube 241 and the bolt 243 together constitute a connecting piece between the pressing block 240 and the piston rod 320. By providing a limiting groove 270 on the upper surface of the module body 100, the pressure block 240 and the inner wall of the limiting groove 270 are mutually constrained, and in the process of the piston rod 320 moving up or pressing down, the pressing claw 210 always approaches or moves away from the workpiece placement position in a straight line direction, which can avoid the problem of the pressing claw 210 failing to press the workpiece due to the displacement or rotation of the pressing claw 210, and improve the reliability of the fixture to position the workpiece. In addition, by providing a limiting tube 241 on the lower surface of the pressing block 240, the mutual sliding between the pressing block 240 and the pressing claw 210 can be limited by the mutual constraint between the limiting tube 241 and the inner wall of the guide hole 250.

[0038] See also Figure 8 The oblique arm 260 includes an inclined portion fixedly connected to the side wall of the pressure claw 210 and parallel to the inclined guide rod 230, and a pressing portion fixedly connected to the end of the inclined portion and extending along the length direction of the module body 100. The lower surface of the pressing portion is fixed with an elastic pressing member 280 for abutting against the workpiece. The elastic pressing member 280 can be made of urethane or silicone material to reduce the damage to the workpiece by the bottom of the oblique arm 260. In addition, in order to improve the pressing effect on the workpiece, in this embodiment, two or more oblique arms 260 are arranged at intervals on the side wall of the pressure claw 210. In this way, the contact area between the pressure claw 210 and the workpiece is increased, which can avoid the problem of shaking of the workpiece during the fine carving operation due to uneven force on the workpiece, so as to improve the yield rate of the fine carving operation of the workpiece.

[0039] In one embodiment, the annular side surface of the sealing disk 310 is sleeved with a first sealing ring 360 that seals with the inner wall of the slot 110, and the annular side surface of the piston disk 330 is sleeved with a second sealing ring 370 that seals with the inner wall of the slot 110. Similarly, the annular side of the sealing disk 310 is provided with a first annular groove 311 for embedding the first sealing ring 360, and the annular side of the piston disk 330 is provided with a second annular groove 331 for embedding the second sealing ring 370. The sealing disk 310 is provided with a connecting hole 312 for passing the piston rod 320, and the connecting hole 312 is embedded with a third sealing ring 380 that seals with the piston rod 320; the inner wall of the slot 110 is provided with a mounting groove 111 adjacent to the notch of the slot 110, and the mounting groove 111 is embedded with a retaining spring 390. The sealing disk 310 is accommodated in the slot 110 and the upper surface of the sealing disk 310 abuts against the lower surface of the retaining spring 390 to achieve the positioning of the sealing disk 310, prevent the occurrence of air leakage in the first piston chamber 340 and / or the second piston chamber 350 due to loosening of the sealing disk 310, and ensure the reliability of the movement of the pressing claw 210.

[0040] In one embodiment, two or more clamping units arranged in an annular manner are provided on the module body 100, and two or more slots 110 corresponding to the cylinder integrated mechanism 300 of each clamping unit are provided on the side of the workpiece placement position, two or more proximity switches 130 corresponding to the side of each slot 110, and two or more oblique guide holes 120 corresponding to the oblique guide rod 230 of each clamping unit are provided on the side of the workpiece placement position. In other words, one slot 110 and the oblique guide hole 120 located on the side of the slot 110 are used to install one clamping unit, and the proximity switch 130 located on the side of the slot 110 is used to detect whether the pressure claw 210 of the clamping unit has moved to the position. By providing two or more clamping units, the clamping effect on the workpiece can be improved, and the reliability of workpiece clamping can be improved. When two or more clamping units are arranged on the module body, the first piston chamber 340 of each slot is connected to the first air pipe joint 140, and the second piston chamber 350 of each slot is connected to the second air pipe joint 150, so as to ensure the consistency of the pressing claw action of each clamping unit and avoid uneven force on the workpiece. Preferably, in this embodiment, a clamping unit is provided on each of the two opposite sides of the workpiece placement position on the module body 100, and a slot 110 and a proximity switch 130 located beside the slot 110 are provided on each of the two opposite sides of the workpiece placement position, and an oblique guide hole 120 is provided on each side of each slot 110, so that the two clamping units are symmetrically arranged on both sides of the workpiece placement position, and the pressing claws 210 of the two clamping units simultaneously clamp the workpiece, so that the workpiece is evenly stressed, further improving the reliability and stability of the workpiece clamping.

[0041] The clamp 10 for precision engraving automation operation of the present invention has the following beneficial effects:

[0042] 1) The original upper and lower clamping mechanism is designed as an oblique clamping mechanism 200, and the sliding cooperation between the inclined guide rod 230 and the linear bearing 220 is used to realize the oblique movement of the clamping claw 210 relative to the horizontal direction, which can avoid the position where the operator clamps the product, reduce the difficulty of clamping and facilitate the operation of the robot.

[0043] 2) The sliding fit between the inclined guide rod 230 and the linear bearing 220 ensures the accuracy and reliability of the movement of the pressure claw 210. The clamping force on the workpiece can be increased by increasing the specifications of the cylinder integrated mechanism 300. There is no need to set up a side push cylinder, which simplifies the fixture structure while ensuring the clamping of the workpiece.

[0044] 3) By fixedly connecting the piston rod 320 and the pressure block 240, and in combination with the sliding cooperation between the pressure block 240 and the pressure claw 210, the sliding connection structure between the piston rod 320 and the pressure claw 210 is optimized, and surface contact dynamic friction is adopted to ensure the force balance of the pressure claw 210 when the cylinder integrated mechanism 300 is pressed down, thereby improving the stability of the workpiece clamping.

[0045] 4) The above-mentioned fixture can be matched with an automated manipulator and a loading fixture to realize automated loading and unloading production during workpiece fine carving.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fixture for precision engraving automation, characterized in that: The invention comprises a module body which is used for being fixedly mounted on a rotary table of a precision engraving machine and has a workpiece placement position on its upper surface, at least one clamping unit located beside the workpiece placement position, a slot located beside the workpiece placement position and extending along the height direction of the module body on its upper surface, an oblique guide hole which is opened beside the slot and extends obliquely and passes through the upper and lower surfaces of the module body, and a proximity switch fixed beside the slot, and a first air pipe joint and a second air pipe joint for connecting to an external air pressure device are provided on the side of the module body; the clamping unit comprises: The oblique clamping mechanism comprises a clamping jaw, a linear bearing fixed in the oblique guide hole, an oblique guide rod fixed on the lower surface of the clamping jaw and inserted into the oblique guide hole to slide with the linear bearing, a clamping block slidably mounted on the upper surface of the clamping jaw and capable of approaching or moving away from the workpiece placement position, a guide hole penetrating the lower surface of the clamping jaw is provided in the sliding area of ​​the clamping block, and a side surface of the clamping jaw adjacent to the workpiece placement position is provided with an oblique arm extending obliquely and corresponding to the workpiece placement position to clamp the workpiece; and The cylinder integrated mechanism comprises a sealing disk embedded in the slot and sealedly connected to the inner wall of the slot, a piston rod located below the pressure claw and passing through the sealing disk, and a piston disk fixed to the bottom end of the piston rod. The top end of the piston rod is fixedly connected to the pressure block via a connector passing through a guide hole. The piston disk separates the area between the sealing disk and the bottom of the slot to form a first piston chamber and a second piston chamber located below the first piston chamber. The first piston chamber is connected to the first air pipe joint via a first air passage passing through the side of the module body, and the second piston chamber is connected to the second air pipe joint via a second air passage passing through the side of the module body.

2. The clamp according to claim 1, characterized in that: A through hole is opened in the middle of the module body and penetrates the upper surface and the lower surface of the module body to form the workpiece placement position, and a workpiece placement plate is fixed in the through hole.

3. The clamp according to claim 2, characterized in that: The through hole includes a workpiece introduction portion and a plate mounting portion located below the workpiece introduction portion and connected to the workpiece introduction portion. The width of the workpiece introduction portion gradually decreases from top to bottom, and the width of the plate mounting portion gradually increases from top to bottom. The workpiece placement plate is embedded in the plate mounting portion and is screwed to the module body.

4. The clamp according to claim 2, characterized in that: An oblique guide hole is provided on each side of the slot, and a linear bearing is fixed in each oblique guide hole. The proximity switch is adjacent to the oblique guide hole on one side of the slot and is located beside the through hole. The lower surface of the pressing block is relatively fixed with two inclined guide rods correspondingly inserted into the two oblique guide holes.

5. The clamp according to claim 1, characterized in that: The upper surface of the pressing claw is provided with a limiting groove extending along the length direction of the module body, the guide hole is provided at the bottom of the limiting groove and passes through the lower surface of the pressing claw, the pressing block is slidably embedded in the limiting groove, a limiting tube penetrating into the guide hole is fixed on the lower surface of the pressing block, and an insertion hole connected to the limiting tube is provided on the upper surface of the pressing block. The pressing block is fixedly connected to the piston rod by a bolt which penetrates the insertion hole and the limiting tube in sequence and is inserted into the top of the piston rod.

6. The clamp according to claim 1, characterized in that: The inclined arm includes an inclined portion fixedly connected to the side wall of the pressure claw and parallel to the inclined guide rod, a pressing portion fixedly connected to the end of the inclined portion and extending along the length direction of the module body, and an elastic pressing piece for resisting the workpiece is fixed on the lower surface of the pressing portion.

7. The clamp according to claim 1, characterized in that: The annular side surface of the sealing disk is sleeved with a first sealing ring that is sealed with the inner wall of the slot, and the annular side surface of the piston disk is sleeved with a second sealing ring that is sealed with the inner wall of the slot. The sealing disk is provided with a connecting hole for passing the piston rod, and the connecting hole is embedded with a third sealing ring that is sealed with the piston rod; the inner wall of the slot is provided with an installation groove adjacent to the slot notch, and a retaining spring is embedded in the installation groove. The sealing disk is accommodated in the slot and the upper surface of the sealing disk abuts against the lower surface of the retaining spring.

8. The clamp according to any one of claims 1 to 7, characterized in that: The module body is provided with two or more clamping units arranged in a ring, and the side of the workpiece placement position is provided with two or more slots corresponding to the cylinder integrated mechanism of each clamping unit, two or more proximity switches corresponding to the side of each slot, and two or more oblique guide holes corresponding to the inclined guide rod of each clamping unit.

9. The clamp according to claim 1, characterized in that: It also includes a connecting turntable, which is fixedly connected to the side of the module body, and the connecting turntable is screwed to the rotating table of the engraving machine.

10. The clamp according to claim 9, characterized in that A boss is provided on one side of the connecting turntable adjacent to the module body, and two groups of clamping blocks are arranged opposite to each other on the boss, a slot is formed between the two groups of clamping blocks, and one side of the module body is embedded in the slot and connected to the connecting turntable screw.

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