Self-centering clamping device for numerical control machine tool

Abstract

The self-centering clamping device for the numerical control machine tool comprises a square shell body, a square disc, a centering mechanism, a cleaning mechanism, a limiting mechanism and a pressing mechanism, metal chips below are blown downwards through a first fan set, a second fan set and a third fan set, and therefore the metal chips can be automatically clamped through a round hole and a rectangular hole. The metal chippings are collected, and the purpose of rapidly cleaning and collecting the metal chippings is achieved; a first linear handle drives a T-shaped limiting rod to move in the direction of a second linear handle, so that the T-shaped limiting rod is disengaged from the interior of a first limiting block, limiting on an iron wire net is relieved, a baffle naturally and vertically falls down, then the iron wire net is pulled out by holding a handle, and metal chippings in the iron wire net are removed; and therefore, the purpose of quickly cleaning the collected metal scraps is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled machine tools, in particular to a self-centering clamping device for numerically controlled machine tools. Background Art

[0002] A CNC machine tool is an automated machine tool equipped with a program control system that can logically process programs specified by control codes or other symbolic instructions, decode them, and represent them in coded numbers, which are input into the CNC device through information carriers. After calculation and processing, the CNC device sends various control signals to control the movement of the machine tool and automatically process parts according to the shape and size required by the drawing. When a circular ring workpiece is processed by a CNC machine tool, the circular ring workpiece is generally fixed on the workbench of the CNC machine tool by a clamping device, and then the processing operation is carried out. Based on the clamping device in the prior art, when fixing the circular ring workpiece, a triangular chuck is used to center and fix the circular ring workpiece from the inside of the circular ring workpiece. During the fixing process, the triangular chuck squeezes the circular ring to make the circular ring workpiece shift upward, and fixes the circular ring workpiece from the inside. When the processing position is close to the inside of the circular ring workpiece, interference will occur, and the fixture needs to be replaced for processing, which greatly reduces efficiency. At the same time, when the processed circular ring workpiece is cleaned, the bottom surface of the circular ring workpiece contacts the receiving plate, making it difficult to clean the metal chips remaining on the bottom surface of the circular ring workpiece. Therefore, a self-centering clamping device for a CNC machine tool with publication number CN112917206B includes a base frame, a centering component, a workpiece cleaning component, a fixture cleaning component, and a centering component. The centering component performs a centering operation on the circular ring workpiece, fixes the circular ring workpiece at a specified position from the inside, and prevents the circular ring workpiece from being pried up during the fixing process. The CNC machine tool starts to process the circular ring workpiece. When the CNC machine tool processes the circular ring workpiece at the inside position, the centering component fixes the circular ring workpiece from the outside of the circular ring workpiece. After the processing is completed, the workpiece cleaning component uses a strong airflow to remove metal chips on the surface of the circular ring workpiece, and automatically presses the circular ring workpiece downward and then clamps it, eliminating the phenomenon of prying up the circular ring workpiece during the fixing process. At the same time, it can switch between inner and outer fixing to adapt to a variety of processing scenarios. It also realizes automatic suspension of the circular ring workpiece and then removal of metal chips on its surface, eliminating the problem of residual metal chips. However, this technical solution still has the following defects: although the metal debris on the bottom surface of the workpiece can be cleaned, the metal debris will be blown everywhere, and smaller and lighter metal debris will be inhaled into the human body, thereby affecting the health of the workers. At the same time, the flying metal debris will also fall on the ground around the above-mentioned device, thereby adding more trouble to the subsequent cleaning. Utility Model Content

[0003] In view of the problems described in the above background technology, the technical problem to be solved by the present invention is to provide a self-centering clamping device for CNC machine tools, which can quickly clean and collect metal debris and clean the collected metal debris.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] A self-centering clamping device for a numerically controlled machine tool, comprising a square shell body, a square plate, a centering mechanism, a cleaning mechanism, a limiting mechanism, and a pressing mechanism;

[0006] The square plate is arranged in the square shell body, the square plate is provided with a chip dropping hole, the square plate is connected to the limiting square ring seat, the bottom of the square shell body is fixed with supporting legs and a U-shaped frame, and the inside of the U-shaped frame is slidably connected to the wire mesh;

[0007] The centering mechanism comprises a first supporting round rod, a second supporting round rod and a square column connected to the upper surface of the square plate, the first supporting round rod is connected to a circular ring frame at one end away from the square plate, the inner side of the circular ring frame is connected to a first electric push rod, and the end of the first electric push rod close to the square column is connected to a clamping block; the end of the second supporting round rod away from the square plate is connected to a circular ring placement plate, the square column is connected to a second electric push rod, and the end of the second electric push rod away from the square column is connected to a centering block;

[0008] The cleaning mechanism includes a first motor installed on the outer surface of the second rectangular tube, a rotating rod is installed at the output end of the first motor, the rotating rod is rotatably connected to the second rectangular tube, the rotating rod is connected to the first gear, and the first gear meshes with the second gear; the second gear is connected to the rotating rod, the rotating rod is rotatably connected to the second rectangular tube, and the two ends of the rotating rod are fixed with a connecting frame, the connecting frame is connected to the first rectangular tube, the first rectangular tube is connected to the second motor, the threaded rod connected to the output end of the second motor is rotatably connected to the inside of the first rectangular tube, the bottom surface of the connecting frame contacts the upper surface of the right-angle support plate, the threaded rod is screwed on the slider, and the slider is slidably connected to the first rectangular tube, the slider fixes the square cover, the square cover is aligned with the limiting square ring seat, and the inner wall of the square cover is installed with a first fan group, a second fan group and a third fan group;

[0009] The limiting mechanism includes a U-shaped member and a first limiting block fixed on the bottom surface of the U-shaped frame, the U-shaped member is connected to a round pin, the round pin is connected to a baffle, the baffle is in contact with the outer surface of the wire mesh, the left side of the baffle is connected to a cylinder, the cylinder is connected to a spring, the end of the spring away from the baffle is connected to a T-shaped limiting rod, and the T-shaped limiting rod is connected to the first limiting block and the cylinder;

[0010] The pressing mechanism includes a Z-shaped frame connected to the outer surface of the square shell body, the Z-shaped frame is connected to the square slide rod, the bottom surface of the square slide rod is connected to the third electric push rod, and the end of the third electric push rod away from the square slide rod is connected to the cross pressing plate; a magnet is arranged on the bottom surface of the square slide rod, and the side of the magnet away from the third electric push rod is adsorbed by the Z-shaped frame, the end of the square slide rod away from the third electric push rod is connected to a stop block, and the side of the stop block close to the square slide rod is connected to a limiting column.

[0011] In the above technical solution, the upper surface of the square shell body is connected to the second limit block, the right side of the square shell body is connected to the second rectangular tube, and the right side of the second rectangular tube is connected to the right-angle support plate.

[0012] In the above technical solution, the centering mechanism is arranged above the square plate, the cleaning mechanism is arranged on the right side of the square shell body, the limiting mechanism is arranged below the square shell body, and the pressing mechanism is arranged on the left side of the square shell body.

[0013] In the above technical solution, the caliber of the limiting square ring seat is matched with the caliber of the square cover.

[0014] In the above technical solution, the shapes of the chip dropping holes include round holes and rectangular holes.

[0015] In the above technical solution, the outer surface of the wire mesh is fixedly connected to a handle.

[0016] In the above technical solution, the square cover is provided with an observation glass and a group of air holes.

[0017] In the above technical solution, the T-shaped limit rod is connected to the first one-way handle, the side of the baffle away from the wire mesh is connected to the second one-way handle, the side of the second one-way handle close to the cylinder is fixedly connected to the spring rod, and the end of the spring rod away from the second one-way handle is connected to the first one-way handle.

[0018] In the above technical solution, a limiting hole is provided inside the Z-shaped frame, and the Z-shaped frame is connected with a square sliding rod.

[0019] Beneficial effect: The utility model starts the first motor, the first motor synchronously drives the rotating rod and the first gear to rotate, the first gear drives the second gear, the rotating rod and the connecting frame to rotate, the connecting frame drives the first rectangular tube and the square cover to rotate upward until the connecting frame contacts the second limit block, so that the square cover is aligned with the limit square ring seat, and then the second motor is started, the second motor drives the threaded rod to rotate, the rotation of the threaded rod drives the slider to move in the direction of the limit square ring seat, the slider synchronously drives the square cover, the first fan group, the second fan group and the third fan group to move in the direction of the limit square ring seat, so that the square cover can be attached to the limit square ring seat, and then the first fan group, the second fan group and the third fan group are started to move the fan below The metal debris is blown downward, so that the metal debris can be blown into the square shell body from the round hole and the rectangular hole, and then blown into the wire mesh from the square shell body, thereby completing the collection of the metal debris and achieving the purpose of quickly cleaning and collecting the metal debris; by pressing the first one-shaped handle in the direction of the second one-shaped handle, the spring and the spring rod are contracted at the same time, and the first one-shaped handle drives the T-shaped limit rod to move in the direction of the second one-shaped handle, so that the T-shaped limit rod is disengaged from the first limit block, thereby releasing the limit on the wire mesh, and then the baffle is naturally dropped vertically, and then the wire mesh is pulled out by holding the handle to clean the metal debris in the wire mesh, thereby achieving the purpose of quickly cleaning the collected metal debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of the centering mechanism of the utility model;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the wire mesh of the utility model;

[0024] Figure 4 It is a three-dimensional structural diagram of the limiting mechanism of the utility model;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the pressing mechanism of the utility model;

[0026] Figure 6It is a three-dimensional structural schematic diagram of the cleaning mechanism of the utility model;

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the cleaning mechanism of the utility model.

[0028] In the figure: 1, square shell body; 2, support legs; 3, fixing plate; 4, square plate; 5, centering mechanism; 501, first supporting round rod; 502, second supporting round rod; 503, square column; 504, circular frame; 505, first electric push rod; 506, clamping block; 507, circular plate; 508, second electric push rod; 509, centering block; 6, cleaning mechanism; 601, first motor; 602, rotating rod; 603, first gear; 604, second gear; 605, rotating rod; 606, connecting frame; 607, first rectangular tube; 608, second motor; 609, threaded rod; 610, slider; 611, square cover; 612, observation glass; 613, air vent; 614, first fan group; 615, second Fan group; 616, the third fan group; 7, limiting mechanism; 701, U-shaped part; 702, round pin; 703, baffle; 704, cylinder; 705, spring; 706, T-shaped limiting rod; 707, first straight handle; 708, spring rod; 709, second straight handle; 710, first limiting block; 8, pressing mechanism; 801, Z-shaped frame; 802, square slide bar; 803, third electric push rod; 804, cross pressing plate; 805, magnet; 806, baffle; 807, limiting column; 808, limiting hole; 9, wire mesh; 10, limiting square ring seat; 11, round hole; 12, rectangular hole; 13, U-shaped frame; 14, handle; 15, second limiting block; 16, second rectangular cylinder; 17, right-angle support plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] according to Figures 1 to 7As shown, as an embodiment: a self-centering clamping device for a CNC machine tool includes a square shell body 1, the bottom surface of the square shell body 1 is fixedly connected to a support leg 2, the end of the support leg 2 away from the square shell body 1 is fixedly connected to a fixing plate 3, the inside of the square shell body 1 is fixedly connected to a square plate 4, a centering mechanism 5 is arranged above the square plate 4, a cleaning mechanism 6 is arranged on the right side of the square shell body 1, a limiting mechanism 7 is arranged below the square shell body 1, a pressing mechanism 8 is arranged on the left side of the square shell body 1, and the upper surface of the square plate 4 The square ring seat 10 is fixedly connected, a group of circular holes 11 are opened inside the square plate 4, four rectangular holes 12 are opened inside the square plate 4, the bottom surface of the square shell body 1 is fixedly connected to the U-shaped frame 13, the wire mesh 9 is slidably connected inside the U-shaped frame 13, the outer surface of the wire mesh 9 is fixedly connected to the handle 14, the upper surface of the square shell body 1 is fixedly connected to the second limit block 15, the right side of the square shell body 1 is fixedly connected to the second rectangular tube 16, and the right side of the second rectangular tube 16 is fixedly connected to the right angle support plate 17. The centering mechanism 5 includes a first supporting round rod 501, a second supporting round rod 502 and a square column 503 fixedly connected to the upper surface of the square plate 4, the end of the first supporting round rod 501 away from the square plate 4 is fixedly connected to the circular ring frame 504, the inner side of the circular ring frame 504 is fixedly connected to the first electric push rod 505, and the end of the first electric push rod 505 close to the square column 503 is fixedly connected to the clamping block 506. One end of the second supporting round rod 502 away from the square plate 4 is fixedly connected to the circular ring placement plate 507 , the outer surface of the square column 503 is fixedly connected to the second electric push rod 508 , and one end of the second electric push rod 508 away from the square column 503 is fixedly connected to the centering block 509 .

[0031] The cleaning mechanism 6 includes a first motor 601 installed on the outer surface of the second rectangular tube 16, and a rotating rod 602 is installed at the output end of the first motor 601. The outer surface of the rotating rod 602 is rotatably connected to the inside of the second rectangular tube 16, and the outer surface of the rotating rod 602 is fixedly connected to the first gear 603. The outer surface of the first gear 603 is meshed with a second gear 604. The interior of the second gear 604 is fixedly connected to a rotating rod 605, and the outer surface of the rotating rod 605 is rotatably connected to the interior of the second rectangular tube 16. Both ends of the rotating rod 605 are fixedly connected to a connecting frame 606, and the bottom surface of the connecting frame 606 contacts the upper surface of the right-angle support plate 17. The outer surface of the connecting frame 606 is fixedly connected to the first rectangular tube 607. The outer surface of the first rectangular tube 607 is installed with a second motor 608, and the output end of the second motor 608 is installed with a threaded rod 609. The outer surface of the threaded rod 609 is threadedly connected to the interior of the first rectangular tube 607. The outer surface of the threaded rod 609 is threadedly connected to a slider 610, and the outer surface of the slider 610 is slidably connected to the inner wall of the first rectangular tube 607. The upper surface of the slider 610 is fixedly connected to a square cover 611, and an observation glass 612 is installed inside the square cover 611. A group of air holes 613 are opened inside the square cover 611, and the inner wall of the square cover 611 is installed with a first fan group 614, a second fan group 615 and a third fan group 616. The limiting mechanism 7 includes a U-shaped piece 701 and a first limiting block 710 fixedly connected to the bottom surface of the U-shaped frame 13. The interior of the U-shaped piece 701 is fixedly connected to a round pin 702, and the outer surface of the round pin 702 is rotatably connected to a baffle 703. The side of the baffle 703 close to the U-shaped frame 13 is in contact with the outer surface of the wire mesh 9. The left side of the baffle 703 is fixedly connected to a cylinder 704, and the inner wall of the cylinder 704 is fixedly connected to a spring 705. The end of the spring 705 away from the baffle 703 is fixedly connected to a T-shaped limiting rod 706, and the outer surface of the T-shaped limiting rod 706 is slidably connected to the interior of the first limiting block 710. The outer surface of the T-shaped limit rod 706 is slidably connected to the inner wall of the cylinder 704, and the outer surface of the T-shaped limit rod 706 is fixedly connected to the first straight handle 707. The side of the baffle 703 away from the wire mesh 9 is fixedly connected to the second straight handle 709. The side of the second straight handle 709 close to the cylinder 704 is fixedly connected to the spring rod 708. The end of the spring rod 708 away from the second straight handle 709 is fixedly connected to the outer surface of the first straight handle 707.

[0032] The pressing mechanism 8 includes a Z-shaped frame 801 fixedly connected to the outer surface of the square shell body 1, a limiting hole 808 is provided inside the Z-shaped frame 801, a square slide bar 802 is slidably connected inside the Z-shaped frame 801, the bottom surface of the square slide bar 802 is fixedly connected to the third electric push rod 803, the end of the third electric push rod 803 away from the square slide bar 802 is fixedly connected to the cross pressing plate 804, a magnet 805 is installed on the bottom surface of the square slide bar 802, a side of the magnet 805 away from the third electric push rod 803 is adsorbed on the outer surface of the Z-shaped frame 801, one end of the square slide bar 802 away from the third electric push rod 803 is fixedly connected to the stopper 806, and a side of the stopper 806 close to the square slide bar 802 is fixedly connected to the limiting column 807.

[0033] The device can be fixed by mounting four fixing plates 3 on the CNC machine table with bolts.

[0034] A rubber pad is provided on one side of the baffle 703 close to the wire mesh 9 .

[0035] The material of the Z-shaped frame 801 is set to stainless steel.

[0036] The wire mesh 9 is made of stainless steel, and mesh holes are provided inside the wire mesh 9 for ventilation, but the size of the mesh holes is smaller than the metal debris, so that the metal debris will not leak out. When the first fan group 614, the second fan group 615 and the third fan group 616 blow air downward, the metal debris inside the wire mesh 9 will not be affected by the impact of the wind and fly upward.

[0037] The caliber of the limiting square ring seat 10 is matched with the caliber of the square cover 611 .

[0038] The square plate is provided with a chip-dropping hole in the form of a round hole or a rectangular hole. Through the round hole 11, metal chips can fall into the square shell body 1 and then into the wire mesh 9. The rectangular hole 12 has the same function as the round hole 11, and can make longer metal chips fall into the square shell body 1 and then into the wire mesh 9. The U-shaped frame 13 is provided to facilitate the wire mesh 9 to slide in the U-shaped frame 13. The handle 14 is provided to facilitate the wire mesh 9 to be pulled out of the U-shaped frame 13. The second limiting block 15 is provided to limit the connection frame 606, so that the connection frame 606 forms a ninety-degree angle with the square shell body 1, so that the square cover 611 is always aligned with the limiting square ring seat 10.

[0039] The function of the right-angle support plate 17 is to provide auxiliary support for the cleaning mechanism 6 .

[0040] There are four supporting legs 2, all of which are arranged on the bottom surface of the square shell body 1, and the specific positions are arranged in the directions of the four corners of the square shell body 1. A fixing plate 3 is arranged at one end of each supporting leg 2, and a mounting through hole is opened inside each fixing plate 3. There are four first supporting round rods 501 and four second supporting round rods 502, all of which are arranged on the upper surface of the square plate 4. There are four first electric push rods 505 and four clamping blocks 506, all of which are arranged on the inner side of the circular ring frame 504. There are four second electric push rods 508 and four centering blocks 509, all of which are arranged on the outer surface of the square column 503. A rubber pad is arranged on the outer surface of each clamping block 506 and the centering block 509. There are two second limit blocks 15, all of which are arranged on the upper surface of the square shell body 1.

[0041] The working principle of the utility model is as follows:

[0042] First, the device is placed on the workbench of the CNC machine tool, and then the four fixing plates 3 are fixed on the workbench by external bolts. Then the circular workpiece is placed on the circular placing plate 507. Then, the second electric push rod 508 is started, and the second electric push rod 508 drives the centering block 509 to center the center of the circular workpiece. Then, the square slide bar 802 is manually pushed to the center of the circular workpiece until the limit column 807 is inserted into the limit hole 808. Then, the third electric push rod 803 is started, and the third electric push rod 803 drives the cross pressing plate 804 to move downward to press the circular workpiece. Then, the first electric push rod 505 is started, and the first electric push rod 505 drives the clamping block 506 to clamp the outer surface of the circular workpiece. The ring workpiece is held fixed, thereby solving the problem of prying up the circular workpiece during the fixing process, and then the third electric push rod 803 is started to shrink the cross pressing plate 804, and the square sliding rod 802 is pushed to the left until the magnet 805 is attracted to the Z-shaped frame 801, so as not to affect the processing of the circular workpiece. After the processing of the circular workpiece is completed, the first motor 601 is started, and the first motor 601 synchronously drives the rotating rod 602 and the first gear 603 to rotate, and the first gear 603 drives the second gear 604, the rotating rod 605 and the connecting frame 606 to rotate, and the connecting frame 606 drives the first rectangular tube 607 and the square cover 611 to rotate upward until the connecting frame 606 contacts the second limit block 15, so that the square cover 611 is aligned with the limit block. The second motor 608 is started, and the second motor 608 drives the threaded rod 609 to rotate. The threaded rod 609 rotates and drives the slider 610 to move toward the direction of the limiting square ring seat 10. The slider 610 synchronously drives the square cover 611, the first fan group 614, the second fan group 615 and the third fan group 616 to move toward the direction of the limiting square ring seat 10, so that the square cover 611 can be attached to the limiting square ring seat 10. Then, the first fan group 614, the second fan group 615 and the third fan group 616 are started to blow the metal debris below downward, so that the metal debris can be blown into the square shell body 1 from the round hole 11 and the rectangular hole 12, and then blown into the wire mesh 9 from the square shell body 1. Thus, the collection of metal debris is completed, and the purpose of quickly cleaning and collecting metal debris is achieved. When the metal debris in the wire mesh 9 needs to be cleaned, first, by holding the second one-shaped handle 709 and the first one-shaped handle 707, by pressing the first one-shaped handle 707 in the direction of the second one-shaped handle 709, the spring 705 and the spring rod 708 are contracted, and the first one-shaped handle 707 drives the T-shaped limiting rod 706 to move in the direction of the second one-shaped handle 709, so that the T-shaped limiting rod 706 is disengaged from the first limiting block 710, thereby releasing the limit on the wire mesh 9, and then the baffle 703 is naturally dropped vertically, and then the wire mesh 9 is pulled out by holding the handle 14, and the metal debris in the wire mesh 9 is cleaned.Thereby achieving the purpose of quickly cleaning the collected metal debris.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Therefore, although the above-mentioned embodiments have shown and described the embodiments of the present invention, they are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. For ordinary technicians in this field, within the technical scope disclosed by the present invention, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, which should all be included in the protection scope of the present invention.

Claims

1. A self-centering clamping device for a CNC machine tool, characterized in that: It includes a square shell body, a square plate, a centering mechanism, a cleaning mechanism, a limiting mechanism, and a pressing mechanism; The square plate is arranged in the square shell body, the square plate is provided with a chip dropping hole, the square plate is connected to the limiting square ring seat, the bottom of the square shell body is fixed with supporting legs and a U-shaped frame, and the inside of the U-shaped frame is slidably connected to the wire mesh; The centering mechanism comprises a first supporting round rod, a second supporting round rod and a square column connected to the upper surface of the square plate, the first supporting round rod is connected to a circular ring frame at one end away from the square plate, the inner side of the circular ring frame is connected to a first electric push rod, and the end of the first electric push rod close to the square column is connected to a clamping block; the end of the second supporting round rod away from the square plate is connected to a circular ring placement plate, the square column is connected to a second electric push rod, and the end of the second electric push rod away from the square column is connected to a centering block; The cleaning mechanism includes a first motor installed on the outer surface of the second rectangular tube, a rotating rod is installed at the output end of the first motor, the rotating rod is rotatably connected to the second rectangular tube, the rotating rod is connected to the first gear, and the first gear meshes with the second gear; the second gear is connected to the rotating rod, the rotating rod is rotatably connected to the second rectangular tube, and the two ends of the rotating rod are fixed with a connecting frame, the connecting frame is connected to the first rectangular tube, the first rectangular tube is connected to the second motor, the threaded rod connected to the output end of the second motor is rotatably connected to the inside of the first rectangular tube, the bottom surface of the connecting frame contacts the upper surface of the right-angle support plate, the threaded rod is screwed on the slider, and the slider is slidably connected to the first rectangular tube, the slider fixes the square cover, the square cover is aligned with the limiting square ring seat, and the inner wall of the square cover is installed with a first fan group, a second fan group and a third fan group; The limiting mechanism includes a U-shaped member and a first limiting block fixed on the bottom surface of the U-shaped frame, the U-shaped member is connected to a round pin, the round pin is connected to a baffle, the baffle is in contact with the outer surface of the wire mesh, the left side of the baffle is connected to a cylinder, the cylinder is connected to a spring, the end of the spring away from the baffle is connected to a T-shaped limiting rod, and the T-shaped limiting rod is connected to the first limiting block and the cylinder; The pressing mechanism includes a Z-shaped frame connected to the outer surface of the square shell body, the Z-shaped frame is connected to the square slide rod, the bottom surface of the square slide rod is connected to the third electric push rod, and the end of the third electric push rod away from the square slide rod is connected to the cross pressing plate; a magnet is arranged on the bottom surface of the square slide rod, and the side of the magnet away from the third electric push rod is adsorbed by the Z-shaped frame, the end of the square slide rod away from the third electric push rod is connected to a stop block, and the side of the stop block close to the square slide rod is connected to a limiting column.

2. A self-centering clamping device for a CNC machine tool according to claim 1, characterized in that: The upper surface of the square shell body is connected to the second limiting block, the right side surface of the square shell body is connected to the second rectangular tube, and the right side surface of the second rectangular tube is connected to the right-angle support plate.

3. A self-centering clamping device for a CNC machine tool according to claim 1 or 2, characterized in that: The centering mechanism is arranged above the square plate, the cleaning mechanism is arranged on the right side of the square shell body, the limiting mechanism is arranged below the square shell body, and the pressing mechanism is arranged on the left side of the square shell body.

4. A self-centering clamping device for a CNC machine tool according to claim 3, characterized in that: The caliber of the position-limiting square ring seat is matched with the caliber of the square cover.

5. A self-centering clamping device for a CNC machine tool according to claim 4, characterized in that: The shapes of the chip dropping holes include round holes and rectangular holes.

6. A self-centering clamping device for a CNC machine tool according to claim 5, characterized in that: The outer surface of the wire mesh is fixedly connected with a handle.

7. The self-centering clamping device for a CNC machine tool according to claim 5, characterized in that: The square cover is provided with an observation glass and a group of air holes.

8. The self-centering clamping device for a CNC machine tool according to claim 5, characterized in that: The T-shaped limiting rod is connected to the first one-shaped handle, the side of the baffle away from the wire mesh is connected to the second one-shaped handle, the side of the second one-shaped handle close to the cylinder is fixedly connected to the spring rod, and the end of the spring rod away from the second one-shaped handle is connected to the first one-shaped handle.

9. The self-centering clamping device for a CNC machine tool according to claim 1, characterized in that: A limiting hole is provided inside the Z-shaped frame, and a square sliding rod is connected to the Z-shaped frame.

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