Driving mechanism in high-speed main shaft clamping device

Abstract

The utility model provides a driving mechanism in a high-speed main shaft clamping device, and belongs to the technical field of machinery. The clamping device solves the problem that an existing clamping device works unstably. The driving mechanism in the high-speed main shaft clamping device comprises a rack, a main shaft horizontally and rotatably arranged on the rack and an air cylinder arranged on the rear side of the main shaft, the main shaft is hollow, a pull rod is horizontally arranged in the main shaft, the air cylinder comprises a piston rod and a cylinder body fixed on the rack, the front end of the piston rod extends out of the cylinder body, and the piston rod is hollow. A connecting cylinder is horizontally arranged between the piston rod and the pull rod, and the piston rod, the pull rod and the connecting cylinder are coaxially arranged; the front end of the piston rod extends into the rear end of the connecting cylinder, and the front end of the piston rod and the rear end of the connecting cylinder are rotationally connected through a bearing arranged in the connecting cylinder. Stable operation of the clamping device can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a high-speed main shaft clamping device, in particular to a driving mechanism in the high-speed main shaft clamping device. Background Art

[0002] The spindle clamping device is an important mechanical component. Its main function is to clamp the workpiece on the machine tool to ensure machining accuracy and stability.

[0003] Existing clamping devices, such as an automatic spindle clamping device disclosed in the China Patent Library (application number: 202123149089.2), include a spindle, a pull rod, a chuck, a spring, a cylinder and a stop plate. The spindle is formed with a through central axis hole along the axial direction, and the first end of the pull rod extends into the central axis hole and is fixedly connected to one end of the chuck. A conical head is formed at the other end of the chuck, and a contraction gap is formed at the outer end of the conical head along the central axis; a stop plate is provided at the second end of the pull rod, and the spring is provided on the pull rod between the stop plate and the spindle, and the second end of the pull rod is in contact with the push rod end of the cylinder.

[0004] The above-mentioned clamping device drives the pull rod backward through the spring to cause the chuck to contract and clamp the workpiece. The cylinder push rod pushes the pull rod forward through contact with the pull rod to cause the chuck to release the workpiece. When the spindle rotates at high speed, this connection method is prone to expansion and contraction and vibration due to inertia, resulting in the chuck being unable to stably clamp the workpiece, affecting the workpiece processing quality and precision. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a driving mechanism in a high-speed spindle clamping device with stable operation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: the driving mechanism in the high-speed spindle clamping device includes a frame, a spindle horizontally rotatably arranged on the frame and a cylinder arranged on the rear side of the spindle, the spindle is hollow, and a pull rod is horizontally arranged in the spindle, the cylinder includes a piston rod and a cylinder body fixed on the frame, and the front end of the piston rod extends out of the cylinder body, and is characterized in that the piston rod is hollow, a connecting tube is horizontally arranged between the piston rod and the pull rod, and the piston rod, the pull rod and the connecting tube are coaxially arranged; the front end of the connecting tube extends into the spindle and is fixedly connected to the rear end of the pull rod, the front end of the piston rod extends into the rear end of the connecting tube and the two are rotatably connected through a bearing arranged in the connecting tube.

[0007] The piston rod is set to be hollow. The front end of the piston rod extends into the connecting cylinder that is fixedly connected to the pull rod, and the connecting cylinder and the pull rod are rotationally connected through a bearing. This is to meet the requirement of forming a reliable connection between the piston rod and the pull rod, while also preventing the cylinder from rotating at high speed with the main shaft, ensuring that the cylinder stably tightens the pull rod so that the chuck arranged at the front end of the main shaft can stably clamp the workpiece, thereby ensuring the machining quality and accuracy of the workpiece.

[0008] In the driving mechanism of the above high-speed spindle clamping device, the rear end of the above piston rod extends out of the cylinder block. The pull rod is hollow and open at both ends. The rear end of the pull rod is inserted and fixed inside the front end of the connecting cylinder. A trachea is horizontally fixed inside the piston rod. The front end of the trachea extends into the front end of the connecting cylinder and they do not contact each other. The rear end of the trachea extends out of the piston rod. During actual use, the rear end of the trachea is connected to a gas supply device through a nozzle to send gas into the connecting cylinder. The gas passes through the pull rod and finally sprays forward through the chuck to blow the waste chips generated by grinding away from the workpiece, effectively avoiding the interference of waste chips on grinding and further improving the machining quality and accuracy of the workpiece.

[0009] In the driving mechanism of the above high-speed spindle clamping device, a connecting ring is fixed at the front end of the piston rod. The connecting ring is sleeved on the trachea, and the above bearing is arranged between the connecting ring and the connecting cylinder. With the above design, it is used to reduce the length of the piston rod to adapt to small-sized cylinders and reduce costs.

[0010] In the driving mechanism of the above high-speed spindle clamping device, a positioning ring is sleeved and fixed on the trachea. The connecting ring is located between the piston rod and the positioning ring, and the connecting ring is clamped and positioned between the rear end face of the positioning ring and the front end face of the piston rod. With the above design, it is convenient for the installation and positioning of the connecting ring.

[0011] In the driving mechanism of the above high-speed spindle clamping device, an annular step matching the piston rod is provided on the inner wall of the rear end of the connecting ring. The front end of the piston rod is embedded in the annular step and pressed on the bottom surface of the annular step to strengthen the positioning strength and stability of the connecting ring and ensure the stable operation of the driving mechanism.

[0012] In the driving mechanism of the above high-speed spindle clamping device, the outer side surface of the middle part of the trachea and the inner side surface of the piston rod match and are attached together. An annular shoulder is formed on the outer wall of the rear end of the trachea, and the annular shoulder is tightly pressed on the rear end face of the piston rod. With the above design and in cooperation with a compression ring, the trachea is limited in all directions to realize the fixed connection between the trachea and the piston rod.

[0013] In the driving mechanism of the above high-speed spindle clamping device, the bearing includes an inner ring and an outer ring. The connecting cylinder is composed of a cylindrical main body and a positioning sleeve coaxially fixed at the rear end of the main body. An annular outer groove is formed between the inner wall of the positioning sleeve and the inner wall of the connecting cylinder. The axial cross-section of the outer groove is in a U shape matching the outer ring. The outer ring is located in the outer groove, and an interference fit is formed between the outer ring and the bottom surface of the outer groove. Both ends of the outer ring are tightly pressed on both end faces of the outer groove.

[0014] In the driving mechanism of the above-mentioned high-speed spindle clamping device, an annular inner groove is formed between the outer wall of the positioning ring and the outer wall of the connecting ring. The axial cross-section of the inner groove is in a U-shape matching the inner ring. The inner ring is located in the inner groove. An interference fit is formed between the inner ring and the bottom surface of the inner groove. The two ends of the inner ring are respectively pressed tightly against the two end surfaces of the inner groove.

[0015] With the cooperation of the outer groove and the inner groove, a very stable rotational cooperation is formed between the connecting ring and the connecting cylinder, further ensuring the stable operation of the driving mechanism.

[0016] In the driving mechanism of the above-mentioned high-speed spindle clamping device, the positioning ring is threadedly connected to the air pipe, which is convenient for adjusting the position of the positioning ring and facilitating assembly.

[0017] In the driving mechanism of the above-mentioned high-speed spindle clamping device, a seal is formed between the outer wall of the air pipe and the piston rod through a sealing ring to prevent external dust from entering through the inner hole of the piston rod.

[0018] Compared with the prior art, the driving mechanism in the high-speed spindle clamping device has the following advantages:

[0019] 1. The piston rod is hollow, and the front end of the piston rod extends into the connecting tube of the fixed pull rod, and the connecting tube and the pull rod are rotatably connected through the bearing to ensure that the piston rod and the pull rod form a reliable connection, and the cylinder does not rotate with the high-speed spindle, ensuring that the cylinder stably tightens the pull rod so that the chuck set at the front end of the spindle can stably clamp the workpiece, thereby ensuring the workpiece processing quality and accuracy.

[0020] 2. In actual use, the rear end of the air pipe is connected to the air supply equipment through the air nozzle to send gas into the connecting tube. The gas passes through the pull rod and finally ejects forward through the chuck to blow the waste chips generated by grinding away from the workpiece, effectively avoiding the interference of waste chips in grinding and further improving the processing quality and precision of the workpiece.

[0021] 3. The locating ring is used for trachea installation positioning, as well as for connecting ring positioning and bearing axial positioning. That is, in the present application, the locating ring has three functions in one, so as to effectively simplify the structure and facilitate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a right side view schematic diagram of the high-speed spindle clamping device.

[0023] Figure 2 It is a cross-sectional schematic diagram of a high-speed spindle clamping device.

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0025] In the figure, 1, frame; 2, main shaft; 3, cylinder; 3a, piston rod; 3b, cylinder body; 4, pull rod; 5, connecting tube; 5a, main body; 5b, positioning sleeve; 5c, outer groove; 6, bearing; 7, air pipe; 7a, annular shoulder; 8, connecting ring; 9, positioning ring; 10, inner groove; 11, sealing ring. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1 As shown, the driving mechanism in the high-speed spindle clamping device includes a frame 1, a spindle 2 horizontally rotatably arranged on the frame 1, and a cylinder 3 arranged at the rear side of the spindle 2.

[0028] in,

[0029] The main shaft 2 is hollow, a pull rod 4 is horizontally arranged inside the main shaft 2 , and the pull rod 4 and the main shaft 2 are coaxially arranged.

[0030] The cylinder 3 is an existing product, comprising a piston rod 3a and a cylinder body 3b fixed on the frame 1, and the front end and the rear end of the piston rod 3a both extend out of the cylinder body 3b. Figure 1 As shown, the piston rod 3a is hollow and both ends are open. A connecting tube 5 is horizontally arranged between the piston rod 3a and the pull rod 4, and the piston rod 3a, the pull rod 4 and the connecting tube 5 are coaxially arranged. The front end of the connecting tube 5 extends into the main shaft 2 and is fixedly connected to the rear end of the pull rod 4, and the front end of the piston rod 3a extends into the rear end of the connecting tube 5 and the two are rotatably connected through a bearing 6 arranged in the connecting tube 5.

[0031] The piston rod 3a is arranged to be hollow, and the front end of the piston rod 3a extends into the connecting tube 5 fixedly connected with the pull rod 4, and the connecting tube 5 and the pull rod 4 are rotatably connected through the bearing 6 to ensure that the piston rod 3a and the pull rod 4 form a reliable connection, and the cylinder 3 does not rotate with the high speed of the main shaft 2, ensuring that the cylinder 3 stably tightens the pull rod 4 so that the chuck arranged at the front end of the main shaft 2 can stably clamp the workpiece, thereby ensuring the workpiece processing quality and accuracy.

[0032] Further explanation: the pull rod 4 is hollow and open at both ends. The rear end of the pull rod 4 is inserted and fixed in the front end of the connecting tube 5, and the pull rod 4 and the connecting tube 5 are preferably welded and fixed. The air pipe 7 is fixed horizontally in the piston rod 3a, and the front end of the air pipe 7 extends into the front end of the connecting tube 5 without the two contacting, and the rear end of the air pipe 7 extends out of the piston rod 3a. In actual use, the above-mentioned chuck is hollow; the rear end of the air pipe 7 is connected to the air supply equipment through the air nozzle to feed gas into the connecting tube 5, and the gas is ejected forward through the pull rod 4 and finally through the chuck to blow the waste chips generated by grinding away from the workpiece, effectively avoiding the waste chips from interfering with the grinding, and further improving the workpiece processing quality and precision.

[0033] As Figure 1 shown, a connecting ring 8 is fixed to the front end of the piston rod 3a. The connecting ring 8 is sleeved on the air pipe 7, and the above-mentioned bearing 6 is arranged between the connecting ring 8 and the connecting cylinder 5. With the above design, it is used to reduce the length of the piston rod 3a to adapt to the small-size cylinder 3 and reduce the cost.

[0034] In this embodiment,

[0035] The positioning method of the connecting ring 8 is as follows: A positioning ring 9 is sleeved and fixed on the air pipe 7. The connecting ring 8 is located between the piston rod 3a and the positioning ring 9, and the connecting ring 8 is clamped and positioned between the rear end face of the positioning ring 9 and the front end face of the piston rod 3a. Further explanation, an annular step matching the piston rod 3a is formed on the inner wall of the rear end of the connecting ring 8. The front end of the piston rod 3a is embedded in the annular step and pressed on the bottom surface of the annular step to enhance the positioning strength and stability of the connecting ring 8 and ensure the stable operation of the driving mechanism.

[0036] The positioning ring 9 is threadedly connected to the air pipe 7, which is convenient for adjusting the position of the positioning ring 9 and convenient for assembly. Naturally, it is also possible to fixedly connect the positioning ring 9 and the air pipe 7 by welding.

[0037] The installation method of the air pipe 7 is as follows: The outer side surface of the middle part of the air pipe 7 and the inner side surface of the piston rod 3a are matched and attached together; An annular shoulder 7a is formed on the outer wall of the rear end of the air pipe 7, and the annular shoulder 7a is tightly pressed on the rear end face of the piston rod 3a. With the above design and in cooperation with the pressing ring, the air pipe 7 is limited in all directions to realize the fixed connection between the air pipe 7 and the piston rod 3a.

[0038] The positioning method of the bearing 6 is as follows: The type of the bearing 6 is a ball bearing 6, including an inner ring and an outer ring; The connecting cylinder 5 is composed of a cylindrical main body 5a and a positioning sleeve 5b coaxially fixed at the rear end of the main body 5a. An annular outer groove 5c is formed between the inner wall of the positioning sleeve 5b and the inner wall of the connecting cylinder 5. The axial cross-section of the outer groove 5c is in a U shape matching the outer ring. The outer ring is located in the outer groove 5c, and an interference fit is formed between the outer ring and the bottom surface of the outer groove 5c. Both ends of the outer ring are tightly pressed on both end faces of the outer groove 5c; An annular inner groove 10 is formed between the outer wall of the positioning ring 9 and the outer wall of the connecting ring 8. The axial cross-section of the inner groove 10 is in a U shape matching the inner ring. The inner ring is located in the inner groove 10, and an interference fit is formed between the inner ring and the bottom surface of the inner groove 10. Both ends of the inner ring are tightly pressed on both end faces of the inner groove 10. With the cooperation of the outer groove 5c and the inner groove 10, a very stable rotational fit is formed between the connecting ring 8 and the connecting cylinder 5, further ensuring the stable operation of the driving mechanism.

[0039] As Figure 1 shown, a seal is formed between the outer wall of the air pipe 7 and the piston rod 3a through a sealing ring 11 to prevent external dust from entering through the inner hole of the piston rod 3a. In the actual product, an annular groove for placing the sealing ring 11 is formed on the inner wall of the piston rod 3a.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A driving mechanism in a high-speed spindle clamping device, comprising a frame (1), a spindle (2) rotatably arranged on the frame (1), and a cylinder (3) arranged at the rear side of the spindle (2), wherein the spindle (2) is hollow, and a pull rod (4) is horizontally arranged inside the spindle (2), and the cylinder (3) comprises a piston rod (3a) and a cylinder body (3b) fixed on the frame (1), and the front end of the piston rod (3a) extends out of the cylinder body (3b), characterized in that: The piston rod (3a) is hollow. A connecting cylinder (5) is horizontally arranged between the piston rod (3a) and the pull rod (4), and the piston rod (3a), the pull rod (4), and the connecting cylinder (5) are coaxially arranged. The front end of the connecting cylinder (5) extends into the main shaft (2) and is fixedly connected to the rear end of the pull rod (4). The front end of the piston rod (3a) extends into the rear end of the connecting cylinder (5), and the two are rotatably connected through a bearing (6) arranged in the connecting cylinder (5).

2. The driving mechanism in the high-speed spindle clamping device according to claim 1, characterized in that: The rear end of the piston rod (3a) extends out of the cylinder block (3b). The pull rod (4) is hollow and open at both ends. The rear end of the pull rod (4) is inserted and fixed inside the front end of the connecting cylinder (5). A trachea (7) is horizontally and fixedly arranged inside the piston rod (3a). The front end of the trachea (7) extends into the front end of the connecting cylinder (5) and the two do not contact each other. The rear end of the trachea (7) extends out of the piston rod (3a).

3. The driving mechanism in the high-speed spindle clamping device according to claim 2 is characterized in that: A connecting ring (8) is fixed to the front end of the piston rod (3a). The connecting ring (8) is sleeved on the trachea (7), and the bearing (6) is arranged between the connecting ring (8) and the connecting cylinder (5).

4. The driving mechanism in the high-speed spindle clamping device according to claim 3 is characterized in that: A positioning ring (9) is sleeved and fixed on the trachea (7). The connecting ring (8) is located between the piston rod (3a) and the positioning ring (9), and the connecting ring (8) is clamped and positioned between the rear end face of the positioning ring (9) and the front end face of the piston rod (3a).

5. The driving mechanism in the high-speed spindle clamping device according to claim 4, characterized in that: An annular step matching the piston rod (3a) is formed on the inner wall of the rear end of the connecting ring (8). The front end of the piston rod (3a) is embedded in the annular step and presses on the bottom surface of the annular step.

6. The driving mechanism in the high-speed spindle clamping device according to claim 4 or 5, characterized in that: The outer side surface of the middle part of the trachea (7) and the inner side surface of the piston rod (3a) match and are attached together. An annular shoulder (7a) is formed on the outer wall of the rear end of the trachea (7), and the annular shoulder (7a) presses tightly on the rear end face of the piston rod (3a).

7. The driving mechanism in the high-speed spindle clamping device according to claim 4 or 5, characterized in that: The bearing (6) includes an inner ring and an outer ring. The connecting cylinder (5) is composed of a cylindrical main body (5a) and a positioning sleeve (5b) coaxially fixed to the rear end of the main body (5a). An annular outer groove (5c) is formed between the inner wall of the positioning sleeve (5b) and the inner wall of the connecting cylinder (5). The axial section of the outer groove (5c) is in a U shape matching the outer ring. The outer ring is located in the outer groove (5c), and an interference fit is formed between the outer ring and the bottom surface of the outer groove (5c). The two ends of the outer ring are respectively pressed tightly on the two end faces of the outer groove (5c).

8. The driving mechanism in the high-speed spindle clamping device according to claim 7, characterized in that: An annular inner groove (10) is formed between the outer wall of the positioning ring (9) and the outer wall of the connecting ring (8). The axial section of the inner groove (10) is in a U shape matching the inner ring. The inner ring is located in the inner groove (10), and an interference fit is formed between the inner ring and the bottom surface of the inner groove (10). The two ends of the inner ring are respectively pressed tightly on the two end faces of the inner groove (10).

9. The driving mechanism in the high-speed spindle clamping device according to claim 4, characterized in that: The positioning ring (9) is threadedly connected to the trachea (7).

10. The driving mechanism in the high-speed spindle clamping device according to claim 2, characterized in that: A seal is formed between the outer wall of the trachea (7) and the piston rod (3a) through a sealing ring (11).

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