Eccentric clamp for boring long shaft

Abstract

The utility model relates to the technical field of machining, and discloses an eccentric clamp for boring a long shaft, which comprises an eccentric rotating wheel, a taper sleeve and an expansion sleeve, the taper sleeve is fixed on the eccentric rotating wheel, a sleeve body of the taper sleeve extends into an inner hole of the eccentric rotating wheel, the expansion sleeve is sleeved on the circumferential surface of the long shaft, a taper hole is formed inside the taper sleeve, and the taper sleeve is fixed on the eccentric rotating wheel. The expansion sleeve extends into the taper hole and is driven by the tightening structure to gradually go deep into the taper hole, so that the expansion sleeve and the taper sleeve are combined in an expansion mode. According to the eccentric clamp, the long shaft is firmly fixed on the eccentric rotating wheel through the expansion fit of the expansion sleeve and the taper sleeve, the long shaft is assisted to eccentrically rotate around the axis of the eccentric hole, the problems of vibration and deflection caused by insufficient rigidity of a cutter are avoided, boring can be accurately carried out according to the axis requirement of the eccentric hole, the machining precision is greatly improved, and the machining efficiency is improved. And the product quality is effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to an eccentric fixture for boring long shafts. Background Technology

[0002] In mechanical manufacturing, it is often necessary to machine long shaft parts (such as drill collars), among which boring an eccentric hole on one end face of the long shaft is a common process requirement. However, traditional machining methods face many difficulties. When using a rotating tool for boring, the rigidity of the tool is severely tested when it penetrates deep into the long shaft, making it prone to vibration and misalignment. This not only makes it difficult to guarantee machining accuracy but also easily leads to tool damage in actual operation, seriously affecting machining efficiency and product quality. Especially for machining deep, long eccentric holes, the rotating tool method is even more inadequate, making it impossible to accurately bore according to the axis requirements of the eccentric hole.

[0003] Therefore, it is necessary to convert to machining by using the eccentric rotation of the long shaft with the axis of the eccentric hole, because there is an urgent need to develop an eccentric fixture that can accommodate the eccentric rotation of the long shaft. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an eccentric jig that can be used for boring eccentric holes with a long shaft.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An eccentric clamp for boring long shafts includes an eccentric wheel, a tapered sleeve, and an expanding sleeve. The tapered sleeve is fixed on the eccentric wheel and its body extends into the inner hole of the eccentric wheel. The expanding sleeve is fitted on the circumferential surface of the long shaft. A tapered hole is formed inside the tapered sleeve. The expanding sleeve extends into the tapered hole and is driven to gradually penetrate deeper into the tapered hole by a tightening structure, so that the expanding sleeve and the tapered sleeve are tightened together.

[0007] As a further improvement to the above technical solution, the tapered sleeve includes a first ring and a first sleeve body that are coaxially connected to each other, the tapered hole is the inner hole of the first sleeve body, and the diameter of the tapered hole gradually increases with the increase of the hole depth.

[0008] As a further improvement to the above technical solution, the first ring is provided with a plurality of first mounting holes, and one end face of the eccentric wheel is provided with the same number of first mounting holes and the first threaded holes are matched one by one. The fixing screw passes through the first mounting holes and matches the first threaded holes; the expansion sleeve gradually extends into the tapered hole from the tail of the tapered sleeve.

[0009] As a further improvement to the above technical solution, the expansion sleeve includes a second ring and a second sleeve body that are coaxially connected to each other, and multiple elastic cone plates arranged in a circumferential array are formed on the second sleeve body.

[0010] As a further improvement to the above technical solution, the tightening structure includes a plurality of tightening screws, a plurality of second mounting holes formed on the second ring, and a plurality of second threaded holes formed on the other end face of the eccentric wheel. The number of second mounting holes and second threaded holes are the same and they fit one by one. The tightening screws pass through the second mounting holes and fit with the corresponding second threaded holes.

[0011] As a further improvement to the above technical solution, the tapered sleeve and the expanding sleeve are separated from each other by a separation structure.

[0012] As a further improvement to the above technical solution, the separation structure includes a third threaded hole on the second ring, into which a push-open screw facing the eccentric wheel is screwed.

[0013] As a further improvement to the above technical solution, a reference cross-section is provided on the circumferential surface of the eccentric wheel.

[0014] As a further improvement to the above technical solution, multiple installation marking grooves are provided on the end face of the first ring away from the first set body.

[0015] The beneficial effects of this utility model are as follows: Compared with the prior art, the eccentric fixture provided by this utility model firmly fixes the long shaft on the eccentric wheel through the tensioning fit between the expansion sleeve and the tapered sleeve, and assists the long shaft to rotate eccentrically around the axis of the eccentric hole. This avoids the vibration and skew problems caused by insufficient tool rigidity, and can accurately perform boring according to the axis requirements of the eccentric hole, which greatly improves the machining accuracy and effectively ensures product quality. Attached Figure Description

[0016] Figure 1 3D for eccentric clamps Figure 1 .

[0017] Figure 2 3D for eccentric clamps Figure 2 .

[0018] Figure 3 This is a sectional view of an eccentric fixture.

[0019] Figure 4 This is a three-dimensional view of the eccentric rotating wheel.

[0020] Figure 5 This is the front view of the eccentric rotor.

[0021] Figure 6 This is a three-dimensional view of the conical sleeve.

[0022] Figure 7 This is a sectional view of the tapered sleeve.

[0023] Figure 8 A 3D diagram of the price increase / decrease.

[0024] Figure 9 This is a schematic diagram of an eccentric clamp for mounting a long shaft.

[0025] Explanation of main component symbols: 1-Eccentric wheel, 11-Inner hole, 12-Reference section, 2-Conical sleeve, 21-Conical hole, 22-First ring, 23-First sleeve body, 24-First mounting hole, 25-Fixing screw, 26-Mounting mark groove, 3-Expansion sleeve, 31-Second ring, 32-Second sleeve body, 33-Elastic cone, 41-Tightening screw, 42-Second mounting hole, 43-Second threaded hole, 51-Third threaded hole, 52-Push-opening screw, 6-Long shaft, 61-Eccentric hole. Detailed Implementation

[0026] This utility model provides an eccentric fixture for boring long shafts. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes the utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0027] Please see Figures 1 to 9 This utility model provides an eccentric clamp for boring a long shaft 6, including an eccentric wheel 1, a conical sleeve 2, and an expansion sleeve 3. The conical sleeve 2 is fixed on the eccentric wheel 1 and the sleeve body of the conical sleeve 2 extends into the inner hole 11 of the eccentric wheel 1. The expansion sleeve 3 is sleeved on the circumferential surface of the long shaft 6. A conical hole 21 is formed inside the conical sleeve 2. The expansion sleeve 3 extends into the conical hole 21 and is driven to gradually penetrate deeper into the conical hole 21 by a tightening structure, so that the expansion sleeve 3 and the conical sleeve 2 are tightened together.

[0028] First, the expansion sleeve 3 is placed on the circumference of the long shaft 6, at which point the expansion sleeve 3 is located at the middle of the long shaft 6. Next, the conical sleeve 2 is placed on the long shaft 6, and the expansion sleeve 3 extends into the conical hole 21 of the conical sleeve 2. Since the conical sleeve 2 is fixed to the eccentric wheel 1 and its sleeve body extends deep into the inner hole 11 of the eccentric wheel 1, when the expansion sleeve 3 is driven deeper into the conical hole 21 by the tightening structure, the expansion sleeve 3 is subjected to radial compression from the inner wall of the conical hole 21. Because the expansion sleeve 3 has a certain elastic deformation capacity, under the compression, the expansion sleeve 3 expands radially outward, thus tightly fitting against the circumference of the long shaft 6, and simultaneously tightening itself against the inner wall of the conical hole 21 of the conical sleeve 2. At this point, the long shaft 6, through the expansion sleeve 3, the conical sleeve 2, and the eccentric wheel 1, forms a relatively fixed whole. The drive mechanism of the boring machine connects to and drives the eccentric wheel 1 to rotate. Due to the eccentricity of the eccentric wheel 1, the long shaft 6 will rotate eccentrically around the axis of the eccentric hole 61. In conjunction with the boring tool, the eccentric hole 61 of the long shaft 6 is machined. The tailstock of the boring machine stabilizes the tail of the long shaft 6, preventing it from wobbling during rotation and ensuring the stability of the machining process.

[0029] This eccentric fixture securely fixes the long shaft 6 to the eccentric wheel 1 through the tensioning fit between the expansion sleeve 3 and the tapered sleeve 2. It assists the long shaft 6 to rotate eccentrically around the axis of the eccentric hole 61, avoiding vibration and skew problems caused by insufficient tool rigidity. It can accurately perform boring according to the axis requirements of the eccentric hole 61, greatly improving machining accuracy and effectively ensuring product quality.

[0030] For details, see Figure 6 and Figure 7 As shown, the tapered sleeve 2 includes a first ring 22 and a first sleeve body 23 coaxially connected to each other. The tapered hole 21 is the inner hole 11 of the first sleeve body 23, and the diameter of the tapered hole 21 gradually increases with the increase of the hole depth. This design allows the expansion sleeve 3 to be uniformly radially compressed along the direction of the gradually increasing hole diameter when it is driven into the tapered hole 21 by the tightening structure. Since the expansion sleeve 3 is uniformly stressed, it can ensure the positioning accuracy of the long shaft 6 in all directions when it is radially expanded and tightly fitted with the circumference of the long shaft 6, avoiding the displacement of the long shaft 6 due to uneven force, thereby providing a stable and reliable positioning basis for subsequent eccentric rotation machining and greatly improving the machining accuracy of the eccentric boring of the long shaft 6.

[0031] Furthermore, the first ring 22 has multiple first mounting holes 24, and one end face of the eccentric wheel 1 has the same number of first threaded holes as the first mounting holes 24, which are matched one-to-one. The fixing screws 25 pass through the first mounting holes 24 and engage with the first threaded holes. This connection method greatly facilitates the installation of the tapered sleeve 2 and the eccentric wheel 1. In actual assembly, the operator can quickly locate the positions of the first mounting holes 24 and the first threaded holes, and then tighten them using common fixing screws 25. Compared to some complex connection methods, such as welding or using special connectors, this method is not only simple to operate, but the tightening force of the fixing screws 25 can ensure a tight connection between the tapered sleeve 2 and the eccentric wheel 1. During the eccentric rotation of the long shaft 6, it effectively prevents relative displacement between the tapered sleeve 2 and the eccentric wheel 1, ensuring the stability of the entire eccentric fixture structure and thus guaranteeing machining accuracy.

[0032] In this embodiment, see Figures 1 to 3 As shown, the expansion sleeve 3 gradually extends into the tapered hole 21 starting from the tail of the tapered sleeve 2. On one hand, extending from the tail of the tapered sleeve 2 allows the operator to visually observe the insertion process of the expansion sleeve 3, enabling more precise control over its depth and preventing issues with the tensioning effect with the long shaft 6 and the bonding strength with the tapered sleeve 2 due to excessive or insufficient insertion. On the other hand, starting from the tail of the tapered sleeve 2, after the expansion sleeve 3 is initially fitted onto the long shaft 6, the operator can first install and fix the tapered sleeve 2 to the eccentric wheel 1, and then gradually extend the expansion sleeve 3 into the tapered hole 21. This operational sequence better aligns with the actual assembly process in production, improving assembly efficiency, reducing operational errors that may result from an unreasonable assembly sequence, and making the entire eccentric fixture assembly process smoother and more efficient.

[0033] For details, see Figure 8 As shown, the expansion sleeve 3 includes a second ring 31 and a second sleeve body 32 coaxially connected to each other. Multiple elastic conical plates 33 are arranged in a circumferential array on the second sleeve body 32. When the expansion sleeve 3 is inserted into the tapered hole 21 of the tapered sleeve 2 and subjected to compression, these elastic conical plates 33 can independently undergo elastic deformation. Due to their circumferential array distribution, they can apply pressure evenly to the circumferential surface of the long shaft 6 from all directions, thereby ensuring a tighter and more uniform fit between the expansion sleeve 3 and the long shaft 6. Compared to the traditional integral expansion sleeve 3 structure, this elastic conical plate 33 design can better adapt to the minor unevenness on the surface of the long shaft 6, effectively avoiding the jumping or offset of the long shaft 6 during rotation caused by poor local fit, significantly improving the stability of the long shaft 6 during eccentric rotation, and providing a strong guarantee for high-precision eccentric boring machining.

[0034] In this embodiment, see Figure 1As shown, the tightening structure includes multiple tightening screws 41, multiple second mounting holes 42 formed on the second ring 31, and multiple second threaded holes 43 formed on the other end face of the eccentric wheel 1. The number of second mounting holes 42 and second threaded holes 43 are the same and they fit one-to-one. The tightening screws 41 pass through the second mounting holes 42 and fit with the corresponding second threaded holes 43. The tightening structure formed by the multiple tightening screws 41 and the corresponding fitting second mounting holes 42 and second threaded holes 43 can provide a reliable and uniform tightening force for the expansion sleeve 3. When each tightening screw 41 is tightened, they simultaneously apply a pulling force to the second ring 31, thereby causing the expansion sleeve 3 to penetrate evenly into the tapered hole 21 of the tapered sleeve 2. This uniform tightening method ensures that the multiple elastic cones 33 on the expansion sleeve 3 are simultaneously and equally compressed in all directions, thereby forming a uniform clamping force on the circumference of the long shaft 6, effectively avoiding instability during the eccentric rotation of the long shaft 6 due to uneven force, and ensuring high-precision machining requirements.

[0035] In actual production, when the long shaft 6 needs to be disassembled after processing, separating the tapered sleeve 2 and the expansion sleeve 3 is a necessary step. To facilitate the separation and disassembly of the tapered sleeve 2 and the expansion sleeve 3, the tapered sleeve 2 and the expansion sleeve 3 are separated by a separation structure. The separation structure specifically includes a third threaded hole 51 on the second ring 31, into which a push-opening screw 52 facing the eccentric wheel 1 is screwed. The operator only needs to use a tool to rotate the push-opening screw 52. As the screw is pushed towards the eccentric wheel 1, its tip will generate a reaction force on the eccentric wheel 1, thereby pushing the expansion sleeve 3 and the tapered sleeve 2 away from each other. Compared with the traditional method that requires additional tools to pry or pull, this operation method is simpler and more direct, and can quickly separate the expansion sleeve 3 and the tapered sleeve 2, greatly saving disassembly time and improving work efficiency.

[0036] See Figure 4 As shown, a reference section 12 is formed on the circumferential surface of the eccentric wheel, playing a crucial role in the installation of the eccentric fixture onto the boring machine tool. The mounting base or related connecting components of the boring machine tool typically have a matching positioning structure. During installation, the operator can quickly and accurately position the eccentric wheel 1 in the predetermined position based on the reference section 12, ensuring that the eccentric axis of the eccentric wheel 1 is precisely aligned with the drive mechanism of the boring machine tool and the machining axis of the long shaft 6. This precise positioning method avoids abnormal eccentric rotation of the long shaft 6 due to installation deviations, greatly improving the accuracy and efficiency of equipment installation and laying a solid foundation for subsequent stable and high-precision machining.

[0037] Preferred, see Figure 6As shown, the first ring 22 has multiple installation marking grooves 26 on its end face opposite to the first sleeve 23. This provides clear and intuitive installation guidance for operators during the installation of the eccentric clamp. When the tapered sleeve 2 needs to be installed onto the eccentric wheel 1, the operator can quickly locate the corresponding position of the first mounting hole 24 and the first threaded hole on the eccentric wheel 1 using the installation marking grooves 26. Compared to the case without markings, this significantly reduces the time spent finding the corresponding hole position during installation, allowing the installation operation to be completed more quickly and significantly improving the overall installation efficiency of the eccentric clamp, thus helping to improve the company's production pace.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An eccentric fixture for long axis boring, characterized by, The eccentric runner, the taper sleeve and the expansion sleeve are included, the taper sleeve is fixed on the eccentric runner and the sleeve body of the taper sleeve extends into the inner hole of the eccentric runner, the expansion sleeve is sleeved on the peripheral surface of the long shaft, the taper hole is formed in the taper sleeve, the expansion sleeve extends into the taper hole and is driven by the tightening structure to gradually extend into the taper hole, so that the expansion sleeve and the taper sleeve are combined with each other.

2. An eccentric clamp for boring long shafts according to claim 1, characterized in that, The taper sleeve includes the first ring and the first sleeve body which are coaxially connected with each other, the taper hole is the inner hole of the first sleeve body, and the hole diameter of the taper hole gradually increases with the increase of the hole depth.

3. An eccentric clamp for boring long shafts according to claim 2, characterized in that, A plurality of first installation holes are formed in the first ring, a plurality of first threaded holes which are the same in number as the first installation holes and are matched with the first installation holes are formed in one end surface of the eccentric runner, and the fixing screws pass through the first installation holes and are matched with the first threaded holes; and the expansion sleeve gradually extends into the taper hole from the tail of the taper sleeve.

4. The eccentric fixture for boring long shafts according to claim 3, characterized in that, The expansion sleeve includes the second ring and the second sleeve body which are coaxially connected with each other, and a plurality of elastic taper pieces which are arranged in the circumferential array are formed on the second sleeve body.

5. An eccentric clamp for boring long shafts according to claim 4, characterized in that, The tightening structure includes a plurality of tightening screws, a plurality of second installation holes which are formed in the second ring, and a plurality of second threaded holes which are formed in the other end surface of the eccentric runner, the number of the second installation holes is the same as that of the second threaded holes and the second installation holes are matched with the second threaded holes one by one, and the tightening screws pass through the second installation holes and are matched with the corresponding second threaded holes.

6. The eccentric fixture for boring long shafts according to claim 4, characterized in that, The taper sleeve and the expansion sleeve are separated from each other by the separation structure.

7. An eccentric clamp for boring long shafts according to claim 6, characterized in that, The separation structure includes the third threaded hole which is formed in the second ring, and a top opening screw which is screwed into the third threaded hole and faces the eccentric runner.

8. The eccentric fixture for boring long shafts according to claim 1, characterized in that, The reference cut surface is formed in the peripheral surface of the eccentric runner.

9. The eccentric fixture for boring long shafts according to claim 2, characterized in that, A plurality of installation mark grooves are formed in the end surface of the first ring which is away from the first sleeve body.

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