Automatic gripping device

Abstract

The utility model relates to processing equipment field discloses an automatic clamping equipment, including the handle of knife for being installed on the main shaft to can be driven to rotate with the main shaft, the clamping mechanism that is connected on the handle of knife to be used for clamping or loosening the product after being driven, the limiting structure for being installed on the main shaft lathe to be used for limiting the rotation angle of handle of knife and the limiting cooperation structure that is fixedly connected to handle of knife and with limiting cooperation structure limiting cooperation, the utility model discloses the cooperation between limiting structure and limiting cooperation structure, can make handle of knife move in the position corresponding to two kinds of state of clamping and loosening the material when the main shaft drives handle of knife to rotate, thereby effectively avoids handle of knife excessive rotation, thereby accurate grasp the separation of product and material, thereby improves product processing efficiency to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of processing equipment, and in particular to an automatic clamping device. Background Technology

[0002] CNC (Computer Numerical Control) machining is a process that uses pre-programmed digital instructions to control machine tools for high-precision parts manufacturing. Its core advantage lies in its ability to automatically complete complex processes such as milling, turning, and drilling, making it particularly suitable for mass production of metal or plastic parts with uniform shapes. In CNC machining, "bridging" (also known as micro-connection or bridging) is a common process, referring to maintaining a tiny connection point of 0.1-0.3mm between the part and the scrap edge. This ensures workpiece stability during machining and facilitates easy separation later, either manually or mechanically. This design significantly improves the yield rate of thin-walled or precision parts while reducing the risk of material deformation.

[0003] Tool holders are specialized tools used in CNC machining for efficiently clamping connected parts, and their design is optimized for the characteristics of connected part processes. These tool holders typically employ hydraulic or heat-shrink clamping technology, equipped with high-rigidity tungsten carbide jaws, which can stably grip workpieces with micro-connections of 0.1-0.3mm during machining, effectively preventing deformation or displacement of thin-walled parts under cutting forces. However, when clamping products for shearing connected parts, the CNC spindle usually clamps the tool holder from the tool magazine to grip the product. Therefore, the tool holder cannot be directly connected to the spindle. Since the tool holder's gripping of the product is usually driven by hydraulic or pneumatic methods, ensuring that the tool holder can be connected to an air or hydraulic source, ensuring that the tool holder can twist off the connected parts as the spindle rotates, and preventing the tool holder from over-rotating, limiting the tool holder's rotation to avoid over-rotation after the spindle and tool holder are connected becomes a challenge. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide an automatic clamping device to solve the problem of rotation limit of existing tool holders.

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic clamping device comprising a tool holder mounted on a spindle and capable of being rotated by the spindle, a clamping mechanism connected to the tool holder for clamping or releasing products after being driven, a limiting structure mounted on a spindle machine tool for limiting the rotation angle of the tool holder, and a limiting engagement structure fixedly connected to the tool holder and engaging with the limiting structure.

[0006] Furthermore, the limiting structure includes a base and a limiting hole disposed on the base. The limiting hole is configured as an arc-shaped hole centered on the central axis of the tool handle and distributed along the circumference of the tool handle. The limiting mating structure includes a connecting block connected to the tool handle and a protrusion disposed on the connecting block and slidably mated within the arc-shaped hole.

[0007] Furthermore, the connecting block has a ring sleeved around the outer periphery of the tool holder, the ring being connected to the tool holder so as to rotate synchronously with it when the spindle drives the tool holder to rotate.

[0008] Furthermore, the clamping mechanism is configured to be driven by an external drive source; the base is provided with a first cavity communicating with the drive source, and the connecting block is provided with a second cavity; when the protrusion slides into the arc-shaped hole, the second cavity communicates with the first cavity.

[0009] Furthermore, a first mating surface facing the base is formed on the connecting block. A transfer cavity communicating with the second cavity through a vent hole is recessed on the first mating surface. A first sealing ring surrounding the transfer cavity is provided on the first mating surface, and the vent hole is located inside the first sealing ring. A second mating surface parallel to the first mating surface is formed at the bottom of the base. An air outlet communicating with the first cavity and adapted to the vent hole is provided on the second mating surface. When the spindle is connected to the tool holder, the first sealing ring abuts against the transfer cavity and the second mating surface so that the air outlet communicates with the transfer cavity.

[0010] Furthermore, an extension platform is formed on the side of the base facing the tool holder, and the arc-shaped hole is formed on the extension platform.

[0011] Furthermore, the clamping mechanism includes a drive unit connected to the tool holder and a clamping unit movably connected to the drive unit for clamping the product. The drive unit is connected to the second cavity through a connecting pipe. After being connected to a drive source, the drive unit is used to drive the clamping unit to clamp or release the product.

[0012] Furthermore, the protrusion has an initial position and a clamping position relative to the arc-shaped hole. When the driving unit drives the clamping part to be in the open state, the protrusion is located in an initial position relative to the arc-shaped hole. When the driving unit drives the clamping part to be in the clamping state, the protrusion is located in a clamping position relative to the arc-shaped hole.

[0013] Furthermore, the clamping part includes a first clamping link and a second clamping link hinged to the driving part and distributed in a mirror image, and clamping blocks respectively connected to the ends of the first clamping link and the second clamping link away from the driving part. Clamping pieces for clamping products extend from the opposing sides of the two clamping blocks. The operation of the driving part causes the first clamping link and the second clamping link to swing so that the two clamping blocks move towards or away from each other. There is a passage space between the two clamping pieces and the clamping blocks for the product to pass through when the clamping part is in the open state.

[0014] Furthermore, the two clamping blocks are slidably connected to the end of the drive unit away from the tool holder and can move towards or away from each other. The operation of the drive unit causes the first clamping link and the second clamping link to swing, causing the two clamping blocks to slide towards or away from each other.

[0015] The automatic clamping device of this utility model has at least the following beneficial effects: through the cooperation between the limiting structure and the limiting matching structure, the tool holder can move in the corresponding position of clamping or releasing the material when the spindle drives the tool holder to rotate, thereby effectively avoiding excessive rotation of the tool holder, thus accurately grasping the separation of the product and the material, thereby improving the product processing efficiency to a certain extent. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the automatic gripping device of this utility model;

[0018] Figure 2 This is a side view of the automatic gripping device of this utility model;

[0019] Figure 3 This is a front sectional view of the automatic gripping device of this utility model;

[0020] Figure 4 This is a partial sectional view of the side of the automatic gripping device of this utility model;

[0021] Figure 5 This is a side sectional view of the limiting structure and the limiting mating structure of this utility model;

[0022] Figure 6 This is a structural schematic diagram of the automatic clamping device (hidden cylinder) of this utility model;

[0023] Figure 7 This is a schematic diagram of the limiting fit structure of this utility model.

[0024] The meanings of the labels in the attached diagram are as follows:

[0025] 1. Tool holder; 2. Clamping mechanism; 21. Drive unit; 21. Fixing block; 211. Sealing cavity; 212. Cylinder; 213. Piston; 214. Second mounting groove; 2141. Connecting rod; 2142. Clearance section; 2143. First through groove; 2144. Second through groove; 2145. Spring; 215. Sealing block; 216. Fourth sealing ring; 2161. First mounting groove; 2162. Second sealing ring; 2163. Third sealing ring; 2164. Second opening; 2171. Drive chamber; 2172. Base plate; 2181. Movable cavity; 2182. Base plate; 2183. Clearance hole; 2184. Slide groove; 2185. Clamping part; 22. First clamping connecting rod; 221 1. First arm segment 2211, second arm segment 2212, first hinge tube 2213, second rotating shaft 2214, second clamping link 222, third arm segment 2221, fourth arm segment 2222, notch 2223, second hinge tube 2224, third rotating shaft 2225, clamping block 223, groove 2231, clamping piece 2232, passage space 2233, limiting structure 3, base 31, extension platform 311, limiting hole 32, limiting mating structure 4, connecting block 41, ring 411, first mating surface 412, central transfer cavity 413, vent hole 414, first sealing ring 415, protrusion 42, connecting pipe 5. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Please see Figures 1 to 7 The automatic clamping device of this invention is used in conjunction with a CNC spindle to clamp products with continuous material. The automatic clamping device includes a tool holder 1 mounted on the spindle and capable of being rotated by the spindle; a clamping mechanism 2 connected to the tool holder 1 for clamping or releasing the product after being driven; a limiting structure 3 mounted on the spindle machine tool to limit the rotation angle of the tool holder 1; and a limiting engagement structure 4 fixedly connected to the tool holder 1 and engaging with the limiting structure 3. The tool holder 1 facilitates connection to the spindle, and the limiting engagement structure 4, in conjunction with the limiting structure 3, drives the clamping mechanism 2 to operate in a clamping or releasing state.

[0028] In this embodiment, the tool holder 1 is a custom-made component, a key interface component specifically designed to connect the spindle and the cutting tool. The tool holder 1 has a tapered interface and a traction bolt. The tapered interface mates with the tapered hole of the spindle to achieve radial positioning, and the spindle is positioned by contacting the tapered surface of the tapered interface. The traction bolt is located at the tail of the tool holder 1 and is gripped by the spindle pull rod to lock the tool holder 1. The tool holder 1 is an existing structure and will not be described in detail here.

[0029] In this embodiment, the clamping mechanism 2 includes a drive unit 21 connected to the knife handle 1 and a clamping unit 22 movably connected to the drive unit 21 for clamping the product. The drive unit 21 is connected to an external drive source so that the clamping unit 22 can be driven to clamp or release the product in cooperation with the drive source.

[0030] The drive unit 21 includes a fixed block 211 bolted to the bottom of the tool holder 1 and having a sealed cavity 212 inside; a cylinder 213 coaxially connected to the bottom surface of the fixed block 211; a piston 214 slidably disposed within the sealed cavity 212; and a spring 215 disposed within the sealed cavity 212 for elastically compressing the piston 214. The cylinder 213 is also fixedly connected to the fixed block 211. The sealed cavity 212 is coaxially arranged with the cylinder 213 and can be cylindrical. For ease of assembly and processing, the sealed cavity 212 extends through the side facing the fixed block 211 to form a first opening. A sealing block 216 is placed at the first opening, and a fourth sealing ring 2161 is provided around the sealing block 216 to ensure the sealing of the first opening. A first mounting groove 2162 is formed on the inward-facing side of the sealing block 216, and one end of the spring 215 extends into the first mounting groove 2162. The piston 214 is cylindrical and adapted to the shape of the sealed cavity 212. In one embodiment, the piston 214 may be made of rubber and its outer wall may be tightly fitted against the inner wall of the sealing cavity 212 to achieve a seal. In another embodiment, the piston 214 may be made of a hard material such as plastic or metal. To ensure a seal, a second sealing ring 2163 is provided around the outer wall of the piston 214, and the second sealing ring 2163 abuts against the inner wall of the sealing cavity 212 to achieve a seal. A second mounting groove 2141 is provided on the side of the piston 214 facing the sealing block 216. The other end of the spring 215 extends out of the first mounting groove 2162 and into the second mounting groove 2141. Based on this, the piston 214 should be made of a hard material. To drive the clamping part, a second opening 2171 is coaxially provided on the side of the cylinder 213 away from the fixing block 211. The second opening 2171 coaxially communicates with the sealing cavity 212. A connecting rod 2142 is formed protruding axially outward (i.e., towards the side away from the fixed block 211) on the side of piston 214 facing away from sealing block 216. The connecting rod 2142 is adapted to the second opening 2171 and its size is smaller than the size of sealing cavity 212, and the connecting rod 2142 extends out of the second opening 2171. When piston 214 abuts against the inner wall of the outer side of sealing cavity 212, spring 215 is in a natural or slightly compressed state, and piston 214 is pressed against the inner wall of the outer side of sealing cavity 212 under the compression of spring 215. It should be noted that a clearance section 2143 is formed on the outer end of piston 214 and at the position between piston 214 and connecting rod 2142. The size of clearance section 2143 is smaller than the size of piston 214 but larger than the size of connecting rod 2142 and second opening 2171, so that it cannot pass through second opening 2171. A drive chamber 2172 is always formed between the outer wall of the clearance section 2143 and the sealing cavity 212. A third sealing ring 2164 is provided on the inner wall of the second opening 2171, and the third sealing ring 2164 abuts against the connecting rod 2142 to keep the drive chamber 2172 in a sealed state.It should be noted that a through hole is formed on the cylinder body 213, extending through the outer side of the drive chamber 2172, and the through hole penetrates the outer wall of the cylinder body 213. The through hole can be connected to an external drive source such as a pneumatic source or a liquid source to drive the entire drive unit 21 by pneumatic or hydraulic means, so that the entire clamping mechanism 2 is a pneumatic clamping mechanism 2 or a hydraulic clamping mechanism 2.

[0031] In this embodiment, two base plates 2181 are fixedly connected to the bottom of the cylinder 213, i.e., the end of the cylinder 213 away from the fixed block 211. The two base plates 2181 are arranged parallel and spaced apart, forming a movable cavity 2182 between the two base plates 2181. The end of the connecting rod 2142 extends into the movable cavity 2182. A base plate 2183 is fixedly connected to the side of the two base plates 2181 away from the cylinder 213. When the piston 214 contacts the outward-facing side of the sealing cavity 212, the connecting rod 2142 approaches the base plate 2183 but is spaced apart from the base plate 2183 and does not contact it. A first through groove 2144 is formed on the connecting rod 2142, extending radially through the connecting rod 2142. A second through groove 2145 is also formed on the connecting rod 2142, extending radially through another part of the connecting rod 2142. The radial direction of the second through groove 2145 is perpendicular to the radial direction of the connecting rod 2142 corresponding to the first through groove 2144. The first through groove 2144 extends towards the side away from the fixing block 211, forming a three-sided opening. The second through groove 2145 has a cylindrical structure, and a first rotating shaft passes through it. The clamping part 22 includes a first clamping link 221 and a second clamping link 222, which are hinged to the driving part 21 and mirror-distributed, and clamping blocks 223 connected to the ends of the first clamping link 221 and the second clamping link 222 away from the driving part 21, respectively. Specifically, the first clamping link 221 includes a first arm segment 2211 and a second arm segment 2212. One end of the first arm segment 2211 passes through the first through groove 2144 and has a U-shaped notch 2223 at its end. The notch 2223 is forked on the first rotating shaft and can rotate relative to the first rotating shaft. A first hinge tube 2213 is formed on the other end of the first arm segment 2211. The first hinge tube 2213 has a third through groove whose axial direction is parallel to the axial direction of the second through groove 2145 and passes through the first hinge tube 2213. A second rotating shaft 2214 is rotatably inserted through the third through groove. The two ends of the second rotating shaft 2214 are respectively connected to the two base plates 2181 so that the first arm segment 2211 can rotate through the second rotating shaft 2214. One end of the second arm segment 2212 is fixedly connected to the first hinge tube 2213, and the other end of the second arm segment 2212 extends away from the fixed block 211. The included angle between the first arm segment 2211 and the second arm segment 2212 can be between 45° and 90°. The second clamping link 222 includes a third arm segment 2221 and a fourth arm segment 2222. One end of the third arm segment 2221 passes through the first through groove 2144 and also has a U-shaped notch 2223 at its end. The notch 2223 is forked on the first rotating shaft and can rotate relative to the first rotating shaft. The first arm segment 2211 and the third arm segment 2221 are staggered after passing through the first through groove 2144.A second hinge tube 2224 is formed on the other end of the third arm segment 2221. The second hinge tube 2224 has a fourth through groove that is axially parallel to the second through groove 2145 and passes through the second hinge tube 2224. A third rotating shaft 2225 is rotatably inserted through the fourth through groove. The two ends of the third rotating shaft 2225 are respectively connected to the two base plates 2181 so that the third arm segment 2221 can rotate through the third rotating shaft 2225. One end of the fourth arm segment 2222 is fixedly connected to the second hinge tube 2224, and the other end of the fourth arm segment 2222 extends toward the side away from the fixed block 211. The included angle between the third arm segment 2221 and the fourth arm segment 2222 can be between 45° and 90°. The first clamping link 221 and the second clamping link 222 are symmetrically distributed on both sides of the connecting rod 2142 and are both located in the movable cavity 2182.

[0032] Clearance holes 2184 are formed on the base plate 2183 corresponding to the ends of the second arm segment 2212 and the fourth arm segment 2222. The two clamping blocks 223 are slidably connected to the base plate 2183 at the end of the drive unit 21 away from the tool holder 1 and can move towards or away from each other. Correspondingly, a sliding groove 2185 is provided on the base plate 2183, which is provided through the base plate 2183 along a through direction parallel to both sides of the first through groove 2144, and the tops of the two clamping blocks 223 are slidably disposed in the sliding groove 2185. By providing dovetail-shaped guide rails or other shaped guide rails on the tops of the two clamping blocks 223, and adapting the cross section of the sliding groove 2185 to them, the two clamping blocks 223 can be restricted to the base plate 2183 and slidably engaged with it. Both clearance holes 2184 are connected to the slide groove 2185, and grooves 2231 are formed on the top of both clamping blocks 223. The ends of the second arm segment 2212 and the fourth arm segment 2222 respectively move into the two grooves 2231.

[0033] In use, the drive source is connected through the through hole. When the piston 214 slides inward toward the sealing block 216, the movable rod moves inward and pushes the ends of the first arm segment 2211 and the third arm segment 2221 inward to swing inward. This causes the second arm segment 2212 and the fourth arm segment 2222 to rotate around the second rotating shaft 2214 and the third rotating shaft 2225 respectively, and swing away from the fixed block 211 towards each other. This pushes the two clamping blocks 223 to slide towards each other and can be used to clamp the product until the two clamping blocks 223 press against each other and clamp the product. When the piston 214 slides outward, the movable rod moves into the movable cavity 2182 and pushes the ends of the first arm segment 2211 and the third arm segment 2221 to swing outward towards the bottom plate 2183, so that the second arm segment 2212 and the fourth arm segment 2222 rotate around the second rotating shaft 2214 and the third rotating shaft 2225 respectively and swing away from the fixed block 211, thereby pushing the two clamping blocks 223 to slide away from each other, which can be used to release the product or put the two clamping blocks 223 in the open state.

[0034] Clamping pieces 2232 for clamping products are formed on opposite sides of the two clamping blocks 223. The two clamping pieces 2232 are located on the side of the clamping block 223 away from the fixing block 211. There is a passage space 2233 between the two clamping pieces 2232 and the clamping block 223 for the product to pass through when the clamping part 22 is in the open state. The passage space 2233 is adapted to the shape of the product to facilitate clamping the product. The two clamping pieces 2232 can clamp the connecting material at the connecting material position to reduce damage to the product when removing the connecting material.

[0035] In this embodiment, the limiting structure 3 includes a base 31 and a limiting hole 32 disposed on the base 31. The base 31 is used to connect to the spindle frame and remain stationary relative to the spindle. It can be fixed to the spindle frame by bolts through threaded holes in the base 31. A first cavity communicating with an external drive source is provided on the base 31. The drive source can be an air source, which is connected to the first cavity (not shown in the figure) through a pipe. A second mating surface is formed at the bottom of the base 31, and an air outlet (not shown in the figure) communicating with the first cavity is provided on the second mating surface. The second mating surface is a horizontal surface. An extension platform 311 is formed on the side of the base 31 facing the tool holder 1. The limiting hole 32 is formed on the extension platform 311 and passes through the extension platform 311 in an axial direction parallel to the tool holder 1. The extension platform 311 is spaced from the spindle after the tool holder 1 is connected to the spindle. The limiting hole 32 is configured as an arc-shaped hole centered on the central axis of the tool holder 1 and distributed along the circumference of the tool holder 1.

[0036] In this embodiment, the limiting fit structure 4 includes a connecting block 41 connected to the tool holder 1 and a protrusion 42 disposed on the connecting block 41 and slidably fitted within the arc-shaped hole. The connecting block 41 has a ring 411 sleeved on the outer periphery of the tool holder 1. The ring 411 is connected to the tool holder 1 so that it rotates synchronously when the spindle drives the tool holder 1 to rotate. Therefore, the ring 411 of the connecting block 41 is fixedly connected to the tool holder 1. A second cavity (not shown in the figure) is provided on the connecting block 41. An internal center is provided between the connecting block 41 and the cylinder 213, with both ends connected to the connecting block 41 and the cylinder 213 respectively. The two ends of the connecting pipe 5 are respectively sealed and connected to the second cavity and the through hole so that the driving part 21 is connected to the second cavity. When the tool holder 1 is connected to the spindle, the protrusion 42 passes through the arc-shaped hole along the axial direction of the tool holder 1 and can slide relative to the arc-shaped hole. The second cavity connects to the first cavity. At this time, after the drive source is connected to the first cavity, it passes through the second cavity and the connecting pipe before entering the drive chamber 2172, thereby driving the extension and retraction of the connecting rod 2142 to clamp or open the two clamping blocks 223. A first mating surface 412 is formed on the connecting block 41, facing the base 31 and parallel to the second mating surface. A transfer cavity 413, connected to the second cavity through a vent hole 414, is recessed on the first mating surface 412. The transfer cavity 413 is open towards the second mating surface, and the vent hole 414 is formed at the midpoint of the cavity wall on the side of the transfer cavity 413 away from the second mating surface. A first sealing ring 415 is provided on the first mating surface 412, surrounding the transfer cavity 413, and the vent hole 414 is located inside the first sealing ring 415. When the spindle is connected to the tool holder 1, the first sealing ring 415 abuts against the transfer cavity 413 and the second mating surface, so that the vent hole connects to the transfer cavity 413, thereby connecting to the second cavity through the vent hole 414.

[0037] In this embodiment, the protrusion 42 has an initial position and a clamping position relative to the arc-shaped hole. When the spindle grips the tool holder 1 and the drive unit 21 drives the clamping part 22 to be in the open state, the protrusion 42 is located in the initial position relative to the arc-shaped hole, and the initial position is located at one end of the arc-shaped hole. When the drive unit 21 drives the clamping part 22 to be in the clamping state, the protrusion 42 is located in the clamping position relative to the arc-shaped hole, and the clamping position is located at the middle position of the arc-shaped hole.

[0038] The working method of one embodiment of the automatic gripping device of this utility model is as follows: At the beginning of use, the tool handle 1 is in the open state. At this time, the piston 214 abuts against the inner wall of the sealing cavity 212 facing outward. At this time, the volume of the drive chamber 2172 is at its minimum, and the connecting rod 2142 is close to the bottom plate 2183. The two gripping blocks 223 are far apart from each other and form a passage space 2233. During use, after the spindle connects to the tool handle 1 in the tool magazine and removes the tool handle 1, the protrusion 42 passes into the arc-shaped hole and is in the initial position. The first mating surface 412 and the second mating surface contact each other, and the first sealing ring 415 seals the surface. Between the first mating surface 412 and the second mating surface, the transfer chamber 413 and the vent are sealed and connected. The CNC worktable moves the product to below the spindle. After the spindle moves to the material handling position for removing the product, it stops and introduces a drive source into the first cavity. The drive source passes sequentially through the vent, transfer chamber 413, vent 414, second cavity, connecting pipe 5, and through hole into the drive chamber 2172, thereby pushing the piston 214 inward. The spring 215 is compressed, and the connecting rod 2142 moves inward, pulling the first clamping link 221 and the end of the second clamping link 222 with the notch 2223. The ends of the second arm segment 2212 and the fourth arm segment 2222 swing towards each other, causing the two clamping blocks 223 to slide towards each other, thereby allowing the clamping plate 2232 to clamp the product. There is a clearance cavity between the end of the clamping block 223 and the clamping plate 2232, allowing the product to reside there when the two clamping blocks 223 are in contact. The clamping plate 2232 can then clamp onto the connecting material. The main shaft rotates ±16 degrees, causing the protrusion 42 to move to the clamping position. The first mating surface 412 and the second mating surface rub against each other. The vent is always within the range of the transfer cavity 413 and connected to the transfer cavity 413. At this time, the product and the connecting material separate, and then the main shaft... The shaft drives the entire automatic gripping device to move above the external receiving box. After the drive source is stopped from being supplied to the first cavity, the piston 214 slides outward under the reset of the spring 215, causing the connecting rod 2142 to move outward and push the first clamping link 221 and the second clamping link 222. This causes the second arm segment 2212 and the fourth arm segment 2222 to swing in opposite directions, causing the two clamping blocks 223 to slide in opposite directions and separate, and the product naturally falls into the receiving box. Repeating the above actions can remove multiple products and break up the connected materials. After the material is removed, the automatic material handling device is put back into the tool magazine without affecting the normal CNC machining. It should be noted that the fixed block 211 is located on the spindle frame and moves with the spindle, and the fixed block 211 is stationary relative to the spindle.

[0039] Compared with the prior art, the automatic clamping device of this utility model, through the cooperation between the first mating surface 412, the second mating surface, the air outlet, the transfer cavity 413, the arc-shaped hole and the protrusion 42, enables the tool holder 1 and the spindle to clamp and release the product, rotate the tool holder 1, connect the drive source, and position and guide the rotation of the tool holder 1 when they are used to break the product connecting material. Through ingenious structural design and combination, it achieves multiple functions, and the overall structure is relatively simple and easy to process.

Claims

1. An automatic gripping device for cooperating with a CNC spindle to grip products, characterized in that: It includes a tool holder for mounting on a spindle so that it can be driven to rotate by the spindle, a clamping mechanism connected to the tool holder for clamping or releasing products after being driven, a limiting structure for mounting on a spindle machine tool to limit the rotation angle of the tool holder, and a limiting engagement structure fixedly connected to the tool holder and engaging with the limiting structure.

2. The automatic gripping device as described in claim 1, characterized in that: The limiting structure includes a base and a limiting hole disposed on the base. The limiting hole is configured as an arc-shaped hole centered on the central axis of the tool handle and distributed along the circumference of the tool handle. The limiting mating structure includes a connecting block connected to the tool handle and a protrusion disposed on the connecting block and slidably mated within the arc-shaped hole.

3. The automatic gripping device as described in claim 2, characterized in that: The connecting block has a ring fitted around the outer periphery of the tool holder, and the ring is connected to the tool holder so as to rotate synchronously with it when the spindle drives the tool holder to rotate.

4. The automatic gripping device as described in claim 2, characterized in that: The clamping mechanism is configured to be driven by an external drive source; the base is provided with a first cavity communicating with the drive source, and the connecting block is provided with a second cavity; when the protrusion slides into the arc-shaped hole, the second cavity communicates with the first cavity.

5. The automatic gripping device as described in claim 4, characterized in that: The connecting block has a first mating surface facing the base. A transfer cavity, which is connected to the second cavity through a vent hole, is recessed on the first mating surface. A first sealing ring is provided on the first mating surface surrounding the transfer cavity, and the vent hole is located inside the first sealing ring. A second mating surface, parallel to the first mating surface, is formed at the bottom of the base. An air outlet is provided on the second mating surface, which is connected to the first cavity and adapted to the vent hole. When the spindle is connected to the tool holder, the first sealing ring abuts against the transfer cavity and the second mating surface, so that the air outlet connects to the transfer cavity.

6. The automatic gripping device as described in claim 5, characterized in that: An extension platform is formed on the side of the base facing the tool holder, and the arc-shaped hole is formed on the extension platform.

7. The automatic gripping device as described in claim 4, characterized in that: The clamping mechanism includes a drive unit connected to the tool holder and a clamping unit movably connected to the drive unit for clamping the product. The drive unit is connected to the second cavity through a connecting pipe. After being connected to a drive source, the drive unit is used to drive the clamping unit to clamp or release the product.

8. The automatic gripping device as described in claim 7, characterized in that: The protrusion has an initial position and a clamping position relative to the arc-shaped hole. When the driving part drives the clamping part to be in the open state, the protrusion is located in an initial position relative to the arc-shaped hole. When the driving part drives the clamping part to be in the clamping state, the protrusion is located in a clamping position relative to the arc-shaped hole.

9. The automatic gripping device as described in claim 8, characterized in that: The clamping part includes a first clamping link and a second clamping link hinged to the drive part and distributed in a mirror image, and clamping blocks respectively connected to the ends of the first clamping link and the second clamping link away from the drive part. Clamping pieces for clamping products extend from the opposing sides of the two clamping blocks. The operation of the drive part causes the first clamping link and the second clamping link to swing so that the two clamping blocks move towards each other or away from each other. There is a passage space between the two clamping pieces and the clamping blocks for the product to pass through when the clamping part is in the open state.

10. The automatic gripping device as described in claim 9, characterized in that: The two clamping blocks are slidably connected to the end of the drive unit away from the tool holder and can move towards or away from each other. The operation of the drive unit causes the first clamping link and the second clamping link to swing, causing the two clamping blocks to slide towards or away from each other.

Images