Tool changing device for spindle of numerical control machine tool

Abstract

The invention relates to the field of tool changing of machine tools, and discloses a numerical control machine tool spindle tool changing device which comprises a telescopic rod, the telescopic end of the telescopic rod is fixedly connected with a rotating seat, the left side and the right side of the rotating seat are fixedly connected with partition plates, electromagnets are fixedly installed in the middles of the lower surfaces of the partition plates, and a stepping motor is fixedly installed on the front face of the rotating seat. And an output shaft of the stepping motor penetrates through the lower part of the rotating seat. The rotating plate rotates by 180 degrees, so that the rotating ring is located under the main shaft, then the rotating ring vertically moves upwards, the rubber ring clamps the cutter, the main shaft loosens the cutter, and therefore the cutter is detached; the rotating ring moves upwards to clamp the tool and then resets downwards, the rotating plate rotates by 180 degrees, and the rotating ring moves upwards to enable the tool to be installed on the main shaft, so that the problems that an existing automatic tool changing device needs a large horizontal space, and the automatic tool changing requirements of a small production workshop and a compact machine tool are difficult to meet are solved.

Description

Technical Field

[0001] This application relates to the technical field of tool changing for machine tools, and particularly to a tool changing device for the spindle of a numerically controlled machine tool. Background Art

[0002] Currently, traditional machining centers on the market have a separate set of tool changing control systems. Although the types of tool magazines in numerically controlled machining centers are different, the tool changing process is the same. When the automatic tool changing device receives a tool changing instruction, the spindle immediately stops rotating and stops at the tool changing position, and the tool is loosened; then the tool magazine selects a tool, and the new tool moves to the tool changing position with the tool magazine, and the tool magazine loosens the tool; the tool changing arm grabs the new and old tools on the tool magazine and the spindle at the same time. After the tool exchange table rotates into place, the new and old tools are respectively rotated onto the spindle and the empty position of the tool magazine; then the spindle clamps the tool, and the tool changing arm returns to the original position to achieve the purpose of tool changing.

[0003] The existing automatic tool changing device clamps the tool with a manipulator and then rotates 180 degrees in the horizontal direction to complete the entire tool changing process. This makes the automatic tool changing device require a large amount of horizontal space, which cannot achieve automatic tool changing in a production workshop with limited space or on a compact machine tool, and it is difficult to meet the needs of smaller production workshops and compact machine tools. Summary of the Invention

[0004] This application proposes a tool changing device for the spindle of a numerically controlled machine tool, which has the advantages of small volume and accurate tool changing, and is used to solve the problem that the existing automatic tool changing device requires a large amount of horizontal space and is difficult to meet the automatic tool changing requirements of smaller production workshops and compact machine tools.

[0005] To achieve the above object, this application adopts the following technical solution: A tool changing device for the spindle of a numerically controlled machine tool, including a telescopic rod, the telescopic end of the telescopic rod is fixedly connected with a rotating seat, both the left and right sides of the rotating seat are fixedly connected with partition plates, an electromagnet is fixedly installed in the middle of the lower surface of the partition plate, a stepping motor is fixedly installed on the front surface of the rotating seat, and the output shaft of the stepping motor passes through the lower part of the rotating seat; A rotating plate, both the upper and lower surfaces of the rotating plate are provided with installation grooves, permanent magnets are fixedly installed inside the installation grooves, an installation cavity is provided inside the rotating plate, two connecting arms are fixedly connected to the right side of the rotating plate, the two connecting arms are symmetrically arranged, and a fixer is rotatably installed at the right part of the connecting arm; Rotating ring, circular holes are provided on both the front and back surfaces of the rotating ring, a ring groove is provided inside the rotating ring, a rubber ring is fixedly installed inside the ring groove, and a counterweight ring is fixedly connected to the lower surface of the rotating ring. With the above structure, during operation, the stepping motor works to drive the rotating plate to rotate 180 degrees, so that the rotating ring is located directly below the main shaft. Subsequently, the telescopic rod shortens, driving the rotating ring to move vertically upward until the tool is located in the middle of the rotating ring. At this time, the tool will squeeze the rubber ring, causing it to clamp the tool, and the main shaft releases the tool, thus completing the disassembly of the tool; when the rotating ring is located directly below the tool to be replaced, the telescopic rod shortens to make the rotating ring clamp the tool, and then it extends and resets. The stepping motor rotates forward 180 degrees, causing the rotating plate to contact the left partition. The left electromagnet is energized to adsorb the lower permanent magnet, and the telescopic rod shortens, so that the tool is installed on the main shaft.

[0006] Preferably, the fixator includes a housing, a T-shaped pin is movably installed inside the housing, a compression spring is fixedly connected between the T-shaped pin and the inner wall of the housing, a pull rod fixedly connected to the T-shaped pin is provided in the middle of the compression spring, and the pull rod penetrates and exposes the outer end of the housing. With the above structure, during operation, pulling the front and rear pull rods causes the T-shaped pin to squeeze the compression spring, thereby removing the rotating ring. Placing a rotating ring of other dimensions between the two T-shaped pins and releasing the pull rod completes the replacement of rotating rings of different dimensions.

[0007] Preferably, a driving motor is fixedly installed on the right side of the rotating plate, a driving gear is fixedly installed on the output shaft of the driving motor, a driven gear is engaged behind the driving gear, a threaded rod is fixedly connected to the middle of the driven gear, and a fixing plate is threadedly connected to the right end of the threaded rod. The front part of the fixing plate is slidably connected to a sliding rod. With the above structure, during operation, the driving motor works to drive the driving gear to rotate. The driving gear drives the threaded rod to rotate through the driven gear, so that the fixing plate moves a proper distance closer to the driving motor. The stepping motor rotates in reverse, driving the rotating plate to rotate 180 degrees. During this process, under the action of the counterweight ring, the tool always remains in a vertically downward state. After the rotating plate rotates, the driving motor rotates in reverse, driving the driving gear to rotate. The driving gear drives the threaded rod to rotate through the driven gear. The rotation of the threaded rod causes the fixing plate to move away from the driving motor and closer to the rotating ring. When the driving motor is in close contact with the rotating ring, it ensures that the rotating ring is in a horizontal state, that is, it ensures that the tool is in a vertical state.

[0008] Preferably, sliding grooves are provided on the inner sides of the two connecting arms, and the sliding grooves are adapted to the front and rear parts of the fixing plate.

[0009] Preferably, the two partition plates are horizontally flush, the rotating plate contacts the bottom surface of the upper partition plate, and the rotating plate is fixedly connected to the output shaft of the stepping motor. In the above structure, when working, the electromagnet is energized to adsorb the permanent magnet directly below, so that the upper surface of the rotating plate is in close contact with the partition plate, thereby ensuring that the rotating plate is in a horizontal state.

[0010] Preferably, the rubber ring protrudes from the ring groove, and the diameter of the round hole is equal to the inner end diameter of the T-shaped pin. In the above structure, when working, when the tool is located in the middle of the rotating ring, the tool will squeeze the rubber ring, causing it to clamp the tool.

[0011] Preferably, the housing is rotatably connected to the connecting arm, and the T-shaped pins on the front and rear sides both extend into the round holes on the corresponding sides, thereby installing the rotating ring between the two connecting arms.

[0012] Preferably, the driving gear and the driven gear are both located inside the installation cavity, the threaded rod is rotatably connected to the rotating plate, and the sliding rod is fixedly connected to the rotating plate.

[0013] Preferably, the threaded rod is rotatably connected to the rear connecting arm and is located inside the rear sliding groove, and the sliding rod is fixedly connected to the front connecting arm and is located inside the front sliding groove.

[0014] Preferably, the fixing plate is adapted to the left side of the rotating ring, and the front and rear parts of the fixing plate are slidably connected to the sliding grooves on the corresponding sides. In the above structure, when working, the driving motor works to drive the driving gear to rotate, and the driving gear drives the threaded rod to rotate through the driven gear, so that the fixing plate moves left and right along the sliding grooves and the sliding rod, thereby realizing the limiting and rotation of the rotating ring by the fixing plate.

[0015] The beneficial effects of the present invention are as follows: 1. In the present invention, the stepping motor works to drive the rotating plate to rotate 180 degrees, so that the rotating ring is located directly below the main shaft. Subsequently, the telescopic rod shortens, driving the rotating ring to move vertically upward until the tool is located in the middle of the rotating ring. At this time, the tool will squeeze the rubber ring, causing it to clamp the tool, and the main shaft releases the tool, thereby completing the disassembly of the tool; when the rotating ring is located directly below the tool to be replaced, the telescopic rod shortens to clamp the tool by the rotating ring, and then extends and resets. The stepping motor rotates forward 180 degrees, so that the rotating plate contacts the left partition plate, and the left electromagnet is energized to adsorb the permanent magnet below. Subsequently, the driving motor works to fix the rotating ring by the fixing plate, and the telescopic rod shortens, so that the tool is installed on the main shaft, thus solving the problem that the existing automatic tool changer requires a large horizontal space, which cannot realize automatic tool change in a production workshop with limited space or on a compact machine tool, and it is difficult to meet the requirements of a smaller production workshop and a compact machine tool.

[0016] 2. The driving motor of the present invention operates to drive the driving gear to rotate. The driving gear drives the threaded rod to rotate through the driven gear, so that the fixing plate moves a proper distance closer to the driving motor. The stepping motor reverses to drive the rotating plate to rotate 180 degrees. During this process, under the action of the counterweight ring, the cutting tool always remains in a vertically downward state. After the rotating plate rotates, the driving motor reverses to drive the driving gear to rotate. The driving gear drives the threaded rod to rotate through the driven gear. The rotation of the threaded rod will cause the fixing plate to move away from the driving motor and closer to the rotating ring. When the driving motor is in close contact with the rotating ring, the rotating ring is ensured to be in a horizontal state, that is, the cutting tool is ensured to be in a vertical state, so that the cutting tool can be accurately installed on the main shaft or the empty position of the tool magazine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings forming a part of the specification illustrate the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application in a clear and understandable manner.

[0018] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein: Figure 1 is a schematic diagram of the overall appearance of the present invention; Figure 2 is a schematic diagram of a half-section of the rotating seat of the present invention; Figure 3 is a schematic diagram of a half-section of the connecting arm of the present invention; Figure 4 is Figure 3 an enlarged schematic diagram at position A in Figure 5 is a schematic diagram of a half-section of the rotating plate of the present invention; Figure 6 is a schematic diagram of a half-section of the rotating ring of the present invention; Figure 7 is a schematic diagram of the structure of the fixing plate of the present invention.

[0019] Wherein: 1. telescopic rod; 2. rotating seat; 3. partition; 4. electromagnet; 5. stepping motor; 6. rotating plate; 7. installation groove; 8. permanent magnet; 9. installation cavity; 10. connecting arm; 11. fixer; 111. housing; 112. T-shaped pin; 113. compression spring; 114. pull rod; 12. rotating ring; 13. round hole; 14. annular groove; 15. rubber ring; 16. counterweight ring; 17. driving motor; 18. driving gear; 19. driven gear; 20. threaded rod; 21. fixing plate; 22. sliding rod; 23. sliding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0021] Please refer to Figure 1-7 , which discloses a tool changing device for the spindle of a numerical control machine tool, including a telescopic rod 1. The telescopic end of the telescopic rod 1 is fixedly connected with a rotating seat 2. Diaphragms 3 are fixedly connected to both the left and right sides of the rotating seat 2. An electromagnet 4 is fixedly installed in the middle of the lower surface of the diaphragm 3. A stepping motor 5 is fixedly installed on the front surface of the rotating seat 2, and the output shaft of the stepping motor 5 passes through the lower part of the rotating seat 2; A rotating plate 6. Installation grooves 7 are formed on both the upper and lower surfaces of the rotating plate 6. Permanent magnets 8 are fixedly installed inside the installation grooves 7. An installation cavity 9 is formed inside the rotating plate 6. Two connecting arms 10 are fixedly connected to the right side of the rotating plate 6. The two connecting arms 10 are symmetrically arranged. A fixator 11 is rotatably installed at the right part of the connecting arm 10; A rotating ring 12. Circular holes 13 are formed on both the front and back surfaces of the rotating ring 12. An annular groove 14 is formed inside the rotating ring 12. A rubber ring 15 is fixedly installed inside the annular groove 14. A counterweight ring 16 is fixedly connected to the lower surface of the rotating ring 12; Its function is that when the stepping motor 5 works, it drives the rotating plate 6 to rotate 180 degrees, so that the rotating ring 12 is located directly below the spindle. Subsequently, the telescopic rod 1 shortens, driving the rotating ring 12 to move vertically upward until the tool is located in the middle of the rotating ring 12. At this time, the tool will squeeze the rubber ring 15, causing it to clamp the tool and the spindle to release the tool, thus completing the disassembly of the tool; when the rotating ring 12 is located directly below the tool to be replaced, the telescopic rod 1 shortens to make the rotating ring 12 clamp the tool, and then extends and resets. The stepping motor 5 rotates forward 180 degrees, so that the rotating plate 6 contacts the left diaphragm 3. The left electromagnet 4 is energized to adsorb the lower permanent magnet 8, and the telescopic rod 1 shortens, so that the tool is installed on the spindle, thus solving the problem that the existing automatic tool changing device requires a large horizontal space, which cannot realize automatic tool changing in a production workshop with limited space or on a compact machine tool, and it is difficult to meet the requirements of a small production workshop and a compact machine tool.

[0022] Among them, the fixture 11 includes a housing 111. A T-shaped pin 112 is movably installed inside the housing 111. A compression spring 113 is fixedly connected between the T-shaped pin 112 and the inner wall of the housing 111. A pull rod 114 fixedly connected to the T-shaped pin 112 is arranged in the middle of the compression spring 113. The pull rod 114 penetrates and exposes the outer end of the housing 111. Its function is to pull the pull rods 114 on the front and back sides, so that the T-shaped pin 112 squeezes the compression spring 113, thereby removing the rotating ring 12, placing the rotating ring 12 of the remaining size between the two T-shaped pins 112, and loosening the pull rod 114, thus completing the replacement of the rotating rings 12 of different sizes.

[0023] Among them, a driving motor 17 is fixedly installed on the right side of the rotating plate 6. A driving gear 18 is fixedly installed on the output shaft of the driving motor 17. A driven gear 19 is engaged with the rear side of the driving gear 18. A threaded rod 20 is fixedly connected to the middle of the driven gear 19. The right end of the threaded rod 20 is threadedly connected to a fixing plate 21. A sliding rod 22 is slidably connected to the front part of the fixing plate 21; Its function is that when the driving motor 17 works, it drives the driving gear 18 to rotate. The driving gear 18 drives the threaded rod 20 to rotate through the driven gear 19, so that the fixing plate 21 moves a proper distance closer to the driving motor 17. The stepping motor 5 rotates in reverse, driving the rotating plate 6 to rotate 180 degrees. During the process, under the action of the counterweight ring 16, the tool is always in a vertically downward state. After the rotating plate 6 rotates, the driving motor 17 rotates in reverse, driving the driving gear 18 to rotate. The driving gear 18 drives the threaded rod 20 to rotate through the driven gear 19. The rotation of the threaded rod 20 will make the fixing plate 21 move away from the driving motor 17 and closer to the rotating ring 12. When the driving motor 17 is in close contact with the rotating ring 12, it ensures that the rotating ring 12 is in a horizontal state, that is, ensures that the tool is in a vertical state, so that the tool can be accurately installed on the main shaft or the vacant position of the tool magazine.

[0024] Among them, sliding grooves 23 are formed on the inner sides of the two connecting arms 10, and the sliding grooves 23 are adapted to the front and rear parts of the fixing plate 21; Among them, the two partition plates 3 are horizontally flush. The rotating plate 6 is in contact with the bottom surface of the upper partition plate 3. The rotating plate 6 is fixedly connected to the output shaft of the stepping motor 5. Its function is that when the electromagnet 4 is energized, it adsorbs the permanent magnet 8 directly below, so that the upper surface of the rotating plate 6 is in close contact with the partition plate 3, thereby ensuring that the rotating plate 6 is in a horizontal state.

[0025] Among them, the rubber ring 15 protrudes from the ring groove 14, and the diameter of the round hole 13 is equal to the inner end diameter of the T-shaped pin 112. Its function is that when the tool is located in the middle of the rotating ring 12, the tool will squeeze the rubber ring 15, causing it to clamp the tool.

[0026] Among them, the housing 111 is rotatably connected to the connecting arm 10, and the T-shaped pins 112 on the front and rear sides both penetrate into the circular holes 13 on the corresponding sides, thereby installing the rotating ring 12 between the two connecting arms 10.

[0027] Among them, the driving gear 18 and the driven gear 19 are both located inside the installation cavity 9. The threaded rod 20 is rotatably connected to the rotating plate 6, and the sliding rod 22 is fixedly connected to the rotating plate 6. The threaded rod 20 is rotatably connected to the rear connecting arm 10 and is located inside the rear sliding groove 23. The sliding rod 22 is fixedly connected to the front connecting arm 10 and is located inside the front sliding groove 23. The fixing plate 21 is adapted to the left side of the rotating ring 12, and the front and rear parts of the fixing plate 21 are slidably connected to the corresponding sliding grooves 23. Its function is that when the driving motor 17 works, it drives the driving gear 18 to rotate. The driving gear 18 drives the threaded rod 20 to rotate through the driven gear 19, so that the fixing plate 21 moves left and right along the sliding grooves 23 and the sliding rod 22, thereby realizing the limiting and rotation of the fixing plate 21 to the rotating ring 12.

[0028] Working principle: When changing the tool of the main shaft, the telescopic rod 1 extends, driving the rotating seat 2, the partition plate 3 and the rotating plate 6 to move downward as a whole to an appropriate distance. Subsequently, the electromagnet 4 above the rotating plate 6 is powered off, and the electromagnet 4 will no longer adsorb the permanent magnet 8 below. Then the stepping motor 5 works, driving the rotating plate 6 to rotate 180 degrees until the lower surface of the rotating plate 6 contacts the partition plate 3 on the left. At this time, the electromagnet 4 on the left is powered on to adsorb the permanent magnet 8 directly below. The machine tool controls the main shaft and the tool to move until the central axes of the main shaft and the tool are collinear with the central axis of the rotating ring 12 and the main shaft and the tool are directly above the rotating ring 12. The telescopic rod 1 shortens, driving the rotating ring 12 to move vertically upward until the cutting tool is located in the middle of the rotating ring 12. At this time, the cutting tool will squeeze the rubber ring 15, causing it to clamp the cutting tool. The main shaft releases the tool. Subsequently, the telescopic rod 1 extends to an appropriate position, the driving motor 17 operates, driving the driving gear 18 to rotate. The driving gear 18 drives the threaded rod 20 to rotate through the driven gear 19, so that the fixing plate 21 moves closer to the driving motor 17. When the fixing plate 21 moves to an appropriate distance, the electromagnet 4 on the left is powered off and will no longer adsorb the permanent magnet 8 below. The stepping motor 5 rotates in reverse, driving the rotating plate 6 to rotate 180 degrees in the reverse direction. During this process, under the action of the counterweight ring 16, the cutting tool always remains in a vertically downward state. When the rotating plate 6 contacts the partition 3 on the right, the electromagnet 4 on the right is powered on and adsorbs the permanent magnet 8 directly below, making the upper surface of the rotating plate 6 in close contact with the partition 3, thereby ensuring that the rotating plate 6 is in a horizontal state. Subsequently, the driving motor 17 rotates in reverse, driving the driving gear 18 to rotate. The driving gear 18 drives the threaded rod 20 to rotate through the driven gear 19. The rotation of the threaded rod 20 causes the fixing plate 21 to move away from the driving motor 17 and closer to the rotating ring 12. When the driving motor 17 is in close contact with the rotating ring 12, it ensures that the rotating ring 12 is in a horizontal state, that is, ensures that the cutting tool is in a vertical state. Subsequently, the telescopic rod 1 shortens, driving the cutting tool to move upward, thereby placing the cutting tool in the empty position of the tool magazine. Subsequently, the telescopic rod 1 extends. The tool magazine moves the cutting tool that needs to be replaced and installed to directly above the rotating ring 12. Subsequently, the telescopic rod 1 shortens to clamp the cutting tool by the rotating ring 12, and then extends and resets. The driving motor 17 operates to make the fixing plate 21 close to the driving motor 17. Subsequently, the electromagnet 4 at the right end is powered off, and the stepping motor 5 rotates 180 degrees in the forward direction, making the rotating plate 6 contact the partition 3 on the left. The electromagnet 4 on the left is powered on to adsorb the permanent magnet 8 below. Subsequently, the driving motor 17 operates to fix the rotating ring 12 by the fixing plate 21. The telescopic rod 1 shortens, so that the cutting tool is installed on the main shaft.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A tool changing device for the spindle of a numerical control machine tool, comprising a telescopic rod (1), and a rotating seat (2) is fixedly connected to the telescopic end of the telescopic rod (1), characterized in that, Both the left and right sides of the rotating base (2) are fixedly connected with partition plates (3). In the middle of the lower surface of the partition plate (3), an electromagnet (4) is fixedly installed. On the front surface of the rotating base (2), a stepper motor (5) is fixedly installed, and the output shaft of the stepper motor (5) penetrates through the lower part of the rotating base (2). A rotating plate (6), both the upper and lower surfaces of the rotating plate (6) are provided with mounting grooves (7). Inside the mounting groove (7), a permanent magnet (8) is fixedly installed. Inside the rotating plate (6), a mounting cavity (9) is formed. On the right side of the rotating plate (6), two connecting arms (10) are fixedly connected. The two connecting arms (10) are symmetrically arranged. At the right part of the connecting arm (10), a fixator (11) is rotatably installed. A rotating ring (12), both the front and back surfaces of the rotating ring (12) are provided with round holes (13). Inside the rotating ring (12), a ring groove (14) is formed. Inside the ring groove (14), a rubber ring (15) is fixedly installed. On the lower surface of the rotating ring (12), a counterweight ring (16) is fixedly connected.

2. The tool changing device for the spindle of a numerically controlled machine tool according to claim 1, characterized in that, The fixator (11) includes a housing (111). Inside the housing (111), a T-shaped pin (112) is movably installed. Between the T-shaped pin (112) and the inner wall of the housing (111), a compression spring (113) is fixedly connected. In the middle of the compression spring (113), a pull rod (114) fixedly connected to the T-shaped pin (112) is provided. The pull rod (114) penetrates through the outer end of the housing (111) and protrudes.

3. The tool changing device for the spindle of a numerically controlled machine tool according to claim 2, wherein, On the right side of the rotating plate (6), a driving motor (17) is fixedly installed. On the output shaft of the driving motor (17), a driving gear (18) is fixedly installed. Behind the driving gear (18), a driven gear (19) is engaged. In the middle of the driven gear (19), a threaded rod (20) is fixedly connected. At the right end of the threaded rod (20), a fixing plate (21) is threadedly connected. In the front part of the fixing plate (21), a sliding rod (22) is slidably connected.

4. The tool changing device for the spindle of a numerical control machine tool according to claim 3, characterized in that, On the inner sides of the two connecting arms (10), sliding grooves (23) are formed, and the sliding grooves (23) are adapted to the front and rear parts of the fixing plate (21).

5. The tool changing device for the spindle of a numerically controlled machine tool according to claim 4, characterized in that, The two partition plates (3) are horizontally flush. The rotating plate (6) contacts the bottom surface of the upper partition plate (3), and the rotating plate (6) is fixedly connected to the output shaft of the stepper motor (5).

6. The tool changing device for the spindle of a numerically controlled machine tool according to claim 5, wherein, The rubber ring (15) protrudes from the ring groove (14), and the diameter of the round hole (13) is equal to the inner end diameter of the T-shaped pin (112).

7. A tool changing device for the spindle of a numerically controlled machine tool according to claim 6, characterized in that, The housing (111) is rotatably connected to the connecting arm (10). The front and rear T-shaped pins (112) both extend into the corresponding round holes (13) inside, thereby installing the rotating ring (12) between the two connecting arms (10).

8. A tool changing device for the spindle of a numerical control machine tool according to claim 7, characterized in that, The driving gear (18) and the driven gear (19) are both located inside the mounting cavity (9). The threaded rod (20) is rotatably connected to the rotating plate (6), and the sliding rod (22) is fixedly connected to the rotating plate (6).

9. The tool changing device for the spindle of a numerical control machine tool according to claim 8, characterized in that, The threaded rod (20) is rotatably connected to the rear connecting arm (10) and is located inside the rear sliding groove (23). The sliding rod (22) is fixedly connected to the front connecting arm (10) and is located inside the front sliding groove (23).

10. A tool changing device for the spindle of a numerical control machine tool according to claim 9, characterized in that, The fixing plate (21) is adapted to the left side of the rotating ring (12). The front and rear parts of the fixing plate (21) are slidably connected to the corresponding sliding grooves (23).

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