Ejector pin clamp mechanism for machining slender shaft parts

Abstract

The utility model provides an ejector pin clamp mechanism for machining slender shaft parts, and belongs to the technical field of machine tool accessories. The problem that an existing ejector pin clamp mechanism is poor in adjusting flexibility is solved. The ejector pin clamp mechanism for machining the slender shaft parts comprises a main shaft, a hollow inner cavity is formed in the main shaft, a mounting hole penetrating through the end of the main shaft is formed in one end of the inner cavity, an ejector pin assembly capable of telescopically moving in the length direction of the inner cavity is arranged in the mounting hole, and a clamp assembly used for fixing the parts is arranged on the main shaft. The clamp assembly is arranged on one side of the mounting hole of the main shaft, and the clamping part of the clamp assembly is distributed around the mounting hole. The adjusting device has the advantage of high adjusting flexibility.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool accessories and relates to an ejector clamp mechanism used for machining slender shaft parts. Background Art

[0002] With the rapid development of my country's modern industry, more and more parts need to be processed with long axes in mechanical processing. However, with the rapid development of my country's industry, the number and types of long axes that need to be processed are increasing. At present, many machine tools in my country have many problems in processing long axis parts. The most common long axis parts processing still relies on ordinary lathes for processing. The ejector pins and workpiece fixtures on traditional machine tools can only clamp and fix the workpiece before the parts are processed. The clamping position of the fixture cannot be adjusted from time to time, resulting in manual adjustment of the coaxiality and circular runout of long axis parts for each processing. Because of the manual adjustment, there are often deviations in the processing dimensions of the two ends of the long axis parts and vibration of the lathe during the processing of long axis parts. Utility Model Content

[0003] The utility model aims to solve the above problems and provides a thimble fixture mechanism for machining slender shaft parts.

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

[0005] A thimble fixture mechanism for processing slender shaft parts comprises a main shaft, wherein the main shaft has a hollow inner cavity, one end of the inner cavity has a mounting hole penetrating the end of the main shaft, and is characterized in that a thimble assembly that can be telescopically moved along the length direction of the inner cavity is arranged in the mounting hole, and a fixture assembly for fixing parts is arranged on the main shaft, the fixture assembly is arranged on one side of the mounting hole of the main shaft, and the supporting part of the fixture assembly is distributed around the mounting hole.

[0006] In the above-mentioned ejector fixture mechanism for processing slender shaft parts, the ejector assembly includes a transmission cylinder body and an ejector. The transmission cylinder body is distributed in the inner cavity in an elongated strip shape, and a through hole for the working part of the ejector to pass through is provided on the end of the transmission cylinder body facing the external mounting hole. The ejector can reciprocate in the transmission cylinder body to pass through the through hole or retract into the transmission cylinder body.

[0007] In the above-mentioned ejector fixture mechanism for processing slender shaft parts, the ejector includes a needle body, the front end of the needle body is a tip portion for holding the workpiece, and the rear end of the ejector has a radial protrusion that is in sealing contact with the inner wall of the transmission cylinder.

[0008] In the above-mentioned ejector fixture mechanism for processing slender shaft parts, a chamber is formed between the sealing ring platform and the end of the transmission cylinder body away from the through hole, and the transmission cylinder body is provided with an inlet pipe and an outlet pipe connected to the interior of the chamber.

[0009] In the above-mentioned ejector fixture mechanism for machining slender shaft parts, the needle body and the sealing ring platform can be integrally formed or detachably connected.

[0010] In the above-mentioned ejector fixture mechanism for machining slender shaft parts, a plurality of evenly distributed sealing grooves are provided on the outer surface of the sealing ring platform, and a sealing ring is arranged in each of the sealing grooves.

[0011] In the above-mentioned ejector fixture mechanism for machining slender shaft parts, the diameter of the through hole is smaller than the diameter of the sealing ring stage.

[0012] In the above-mentioned ejector clamp mechanism for processing slender shaft parts, the clamp assembly includes a clamp seat and a plurality of claws arranged on the clamp seat, and the plurality of claws are evenly distributed on the clamp seat in the circumferential direction with the central axis of the mounting hole as the center, and the plurality of claws can be moved synchronously close to the central axis of the mounting hole or away from the central axis of the mounting hole.

[0013] In the above-mentioned ejector clamp mechanism for machining slender shaft parts, the number of the clamping claws is 3.

[0014] Compared with the existing technology, the advantages of the utility model are: during the entire processing process, the ejector pin always presses against the end of the part to prevent its axial movement, the clamp assembly is adjusted as the cutting position of the part is adjusted, the cutting stability is always maintained, and it has the advantage of strong adjustment flexibility.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] In the figure, 1, main shaft; 2, inner cavity; 3, mounting hole; 4, ejector assembly; 5, fixture assembly; 6, transmission cylinder; 7, ejector; 8, perforation; 9, needle body; 10, tip; 11, sealing ring platform; 12, chamber; 13, inlet pipe; 14, outlet pipe; 15, sealing groove; 16, sealing ring; 17, fixture seat; 18, claw. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a pin fixture mechanism for processing slender shaft parts includes a main shaft 1, a hollow inner cavity 2 is provided in the main shaft 1, one end of the inner cavity 2 has a mounting hole 3 that passes through the end of the main shaft 1, a pin assembly 4 that can be telescopically moved along the length direction of the inner cavity 2 is arranged in the mounting hole 3, and a fixture assembly 5 for fixing parts is arranged on the main shaft 1. The fixture assembly 5 is arranged on one side of the mounting hole 3 of the main shaft 1, and the supporting part of the fixture assembly 5 is distributed around the mounting hole 3.

[0020] In this embodiment, the ejector clamp mechanism is used to support and fix one end of a slender shaft-like part, which cooperates with the tool for cutting. When the tool has completed cutting a part of the part, the spindle 1 will begin to move toward the middle part of the part, so that the ejector 7 will move relatively and shrink into the inner cavity 2, so that the spindle 1 wraps the completed part of the part, and then the clamp assembly 5 works to clamp the part, and the tool starts to cut the unfinished part of the part against the clamp assembly 5, and this cycle is repeated until the part is completed. During the entire processing process, the ejector 7 always presses against the end of the part to prevent its axial movement, and the clamp assembly 5 is adjusted as the cutting position of the part is adjusted to always maintain the stability of the cutting.

[0021] In this embodiment, the ejector assembly 4 includes a transmission cylinder body 6 and an ejector 7. The transmission cylinder body 6 is distributed in the inner cavity 2 in a long strip shape, and a through hole 8 for the working part of the ejector 7 to pass through is provided on one end of the transmission cylinder body 6 facing the external mounting hole 3. The ejector 7 can reciprocate in the transmission cylinder body 6 to pass through the through hole 8 or retract into the transmission cylinder body 6.

[0022] In this embodiment, the ejector pin 7 includes a needle body 9, the front end of the needle body 9 is a tip portion 10 for holding a workpiece, and the rear end of the ejector pin 7 has a radially protruding sealing ring 11 that is in sealing contact with the inner wall of the transmission cylinder body 6. Preferably, a plurality of evenly distributed sealing grooves 15 are provided on the outer surface of the sealing ring 11, and a sealing ring 16 is provided in each sealing groove 15. The sealing ring 11 and the sealing ring 16 on the sealing ring 11 are provided to maintain the sealing performance of the ejector pin 7 when it moves relative to the transmission cylinder body 6.

[0023] In this embodiment, a chamber 12 is formed between the sealing ring stage 11 and the end of the transmission cylinder body 6 away from the through hole 8, and an inlet pipe 13 and an outlet pipe 14 connected to the inside of the chamber 12 are provided on the transmission cylinder body 6. The chamber 12 is used for filling with air or oil. Preferably, oil can be selected. Oil has more stable performance and can withstand greater pressure than air. When it is necessary to push the ejector pin 7 to move toward the side of the mounting hole 3, oil can be filled into the chamber 12 through the inlet pipe 13. When the ejector pin 7 needs to move away from the mounting hole 3, the oil can be returned through the outlet pipe 14.

[0024] In this embodiment, the needle body 9 and the sealing ring platform 11 can be integrally formed or detachably connected. Both have their own advantages. The integral one has the advantage of higher strength, and the detachable connection has the advantage of convenient disassembly and replacement.

[0025] In this embodiment, the diameter of the through hole 8 is smaller than the diameter of the sealing ring stage 11 , which is equivalent to limiting the sealing ring stage 11 . When the sealing ring stage 11 moves to the position of the through hole 8 , the maximum displacement is reached.

[0026] In this embodiment, the clamp assembly 5 includes a clamp seat 17 and a plurality of claws 18 arranged on the clamp seat 17. The plurality of claws 18 are evenly distributed on the clamp seat 17 in a circumferential direction with the central axis of the mounting hole 3 as the center, and the plurality of claws 18 can be synchronously moved close to the central axis of the mounting hole 3 or away from the central axis of the mounting hole 3. Preferably, the number of the claws 18 is 3.

[0027] Those skilled in the art should understand that the fixture assembly 5 is a conventional technical means in the field of machine tools. Since the creative point of the technical solution of the present application does not lie in the improvement of the fixture assembly 5, its structure will not be described in detail.

[0028] The working principle of the utility model is as follows: the ejector clamp mechanism is used to hold and fix one end of a slender shaft-like part, which cooperates with a tool for cutting. When the tool has completed cutting a part of the part, the spindle 1 will start to move toward the middle part of the part, so that the ejector 7 will move relatively and shrink into the inner cavity 2, so that the spindle 1 wraps around the part that has been processed, and then the claws 18 are closed to clamp the part, and the tool starts to cut the unfinished part of the part against the fixture seat 17, and this cycle is repeated until the part is processed.

[0029] 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.

[0030] Although more terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

Claims

1. A thimble fixture mechanism for machining slender shaft parts, comprising a spindle (1), wherein the spindle (1) has a hollow inner cavity (2), and one end of the inner cavity (2) has a mounting hole (3) penetrating the end of the spindle (1), characterized in that: The mounting hole (3) is provided with a pin assembly (4) which can be telescopically moved along the length direction of the inner cavity (2); the spindle (1) is provided with a clamp assembly (5) for fixing parts; the clamp assembly (5) is arranged on one side of the mounting hole (3) of the spindle (1), and the supporting part of the clamp assembly (5) is distributed around the mounting hole (3).

2. The ejector fixture mechanism for machining slender shaft parts according to claim 1, characterized in that: The ejector assembly (4) comprises a transmission cylinder body (6) and an ejector pin (7); the transmission cylinder body (6) is distributed in the inner cavity (2) in the form of an elongated strip, and a through hole (8) is provided on one end of the transmission cylinder body (6) facing the outer mounting hole (3) for the working part of the ejector pin (7) to pass through; the ejector pin (7) can reciprocate in the transmission cylinder body (6) to pass through the through hole (8) or retract into the transmission cylinder body (6).

3. The ejector fixture mechanism for machining slender shaft parts according to claim 2, characterized in that: The ejector pin (7) comprises a needle body (9), the front end of the needle body (9) is a tip portion (10) for holding a workpiece, and the rear end of the ejector pin (7) has a radially protruding sealing ring platform (11) in sealing contact with the inner wall of the transmission cylinder body (6).

4. The ejector fixture mechanism for machining slender shaft parts according to claim 3, characterized in that: A chamber (12) is formed between the sealing ring platform (11) and the end of the transmission cylinder body (6) away from the through hole (8), and the transmission cylinder body (6) is provided with an inlet pipe (13) and an outlet pipe (14) which are connected to the interior of the chamber (12).

5. The ejector fixture mechanism for machining slender shaft parts according to claim 3, characterized in that: The needle body (9) and the sealing ring platform (11) can be integrally formed or detachably connected.

6. The ejector fixture mechanism for machining slender shaft parts according to claim 3, characterized in that: A plurality of evenly distributed sealing grooves (15) are provided on the outer surface of the sealing ring platform (11), and a sealing ring (16) is arranged in each of the sealing grooves (15).

7. The ejector fixture mechanism for machining slender shaft parts according to claim 3, characterized in that: The diameter of the through hole (8) is smaller than the diameter of the sealing ring platform (11).

8. The ejector fixture mechanism for machining slender shaft parts according to claim 1, characterized in that: The clamp assembly (5) comprises a clamp seat (17) and a plurality of claws (18) arranged on the clamp seat (17); the plurality of claws (18) are evenly distributed on the clamp seat (17) in a circumferential direction with the central axis of the mounting hole (3) as the center, and the plurality of claws (18) can be synchronously moved closer to the central axis of the mounting hole (3) or away from the central axis of the mounting hole (3).

9. The ejector fixture mechanism for machining slender shaft parts according to claim 8, characterized in that: The number of the claws (18) is three.

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