Wedge type tire expanding clamp capable of achieving rapid clamping

Abstract

An inclined wedge type expansion tire clamp capable of achieving rapid clamping comprises a wedge-shaped pin, an expansion tire, a tire core and a control assembly, a mounting hole is formed in the axis position of the expansion tire, a through hole is formed in the expansion tire, the axis of the through hole is perpendicular to the axis of the expansion tire, and the wedge-shaped pin is installed in the through hole and is in sliding connection with the wedge-shaped pin in the axis direction of the through hole; the expander is provided with a stepped shaft on one side of the through hole, the stepped shaft comprises a plurality of shaft sections, the outer diameters of different shaft sections are reduced in the direction far away from the through hole, and a plurality of narrow grooves are uniformly distributed in the circumferential direction of one end of the stepped shaft to form an expanding petal part; the tire core is positioned in the mounting hole; the wedge-shaped pin is provided with a matched inclined surface; the end part of the tire core is in contact with the matched inclined surface; a limiting hole with the inner diameter smaller than that of the mounting hole is formed in the end of the mounting hole, a matching fillet is arranged between a step face between the limiting hole and the mounting hole and the inner wall face of the limiting hole, a matching chamfer is arranged at the end of the tire core, and the matching fillet makes contact with the matching chamfer. The control assembly is used for driving the wedge-shaped pin to move in the axis direction of the through hole. And quick positioning and clamping of a hole positioning machining part are realized.

Description

Technical Field

[0001] The present application belongs to the technical field of mechanical structures and relates to a device for rapid clamping and positioning of mechanical parts during machining. Background Art

[0002] Servo mechanisms and their power units contain a wide variety of components with high precision requirements. Many parts that rely on holes for positioning (such as valve cores, rotors, and housings) require multiple machining operations, resulting in cumbersome and repetitive clamping and positioning processes and low processing efficiency. With the increasing number of units put into production, the design of a fixture with fast clamping and high precision is becoming a trend to achieve high-volume, high-efficiency, and high-precision production.

[0003] For parts positioned by holes, mandrels are typically used for tensioning. However, this method is difficult to remove and can easily scratch the part's inner hole. Consequently, tire expansion clamps are widely used in the machining industry for tensioning and clamping. These clamps utilize the principle of center of mass movement, increasing the clamping force by increasing the length of the clamping arm to clamp the part. Traditional pull-back expansion clamps incorporate a tie rod structure, which is complex. Furthermore, these clamps, along with the part being machined, move backward, resulting in positioning deviations and low precision. Patent 1 (patent number: CN 202721571 U) proposes an inner hole expansion tire for rough turning of rotors, which can effectively avoid scratching parts and has high clamping efficiency, but the tooling structure is relatively complex, and the expansion tire is used for rough processing and cannot complete high-precision processing; Patent 2 (patent number: CN 203621541 U) proposes a tire expansion fixture for lathes, which can effectively reduce the workpiece's own runout, ensure the coaxiality requirements during processing, and is easy to use, but the fixture is large in size, consists of more than 10 parts, and can only be used for lathe structures. Utility Model Content

[0004] The technical problem addressed by this application is to overcome the shortcomings of the prior art by providing a rapidly clamping, angled wedge-shaped tire expansion fixture. This fixture allows for rapid positioning and clamping of parts for hole-based positioning. This optimizes the structure of tire expansion tooling, simplifies the tooling, and improves machining accuracy (especially the axial dimensional accuracy of rotating parts) and efficiency, reducing the labor intensity of the operator. Furthermore, this fixture can be used not only for lathe operations but also for milling, grinding, and bench work, thereby increasing the applicability of tire expansion tooling.

[0005] The technical solutions provided in this application are as follows:

[0006] A rapidly clampable inclined wedge-type tire expansion clamp comprises a wedge-shaped pin, a tire expansion, a tire core, and a control assembly. A mounting hole is provided at the axial position of the tire expansion, a through hole is provided in the middle of the tire expansion, the axis of the through hole being perpendicular to the axis of the tire expansion, the wedge-shaped pin is inserted into the through hole, and the wedge-shaped pin is slidably connected to the wedge pin along the axial direction of the through hole; the end of the tire expansion at one side of the through hole is a stepped shaft, the stepped shaft comprising a plurality of shaft segments with different outer diameters, the outer diameters of the different shaft segments gradually decreasing as they move away from the through hole, and a plurality of narrow grooves are uniformly distributed along the circumference at one end of the stepped shaft of the tire expansion to form an expansion petal portion; The tire core is installed in the mounting hole and is located in the stepped shaft; the side of the wedge pin facing the tire core is a matching bevel, and there is an acute angle between the matching bevel and the wedge pin, and the end of the tire core contacts the matching bevel; the mounting hole is provided with a limiting hole at the end of the expanding petal part, the inner diameter of the limiting hole is smaller than the inner diameter of the mounting hole, and there is a matching fillet between the step surface between the limiting hole and the mounting hole and the inner wall surface of the limiting hole, and the end of the tire core is provided with a matching chamfer, and the matching fillet contacts the matching chamfer; the control component is connected between the wedge pin and the expanding tire, and is used to drive the wedge pin to move along the axial direction of the through hole.

[0007] The included angle between the matching inclined surface and the axis of the wedge pin is 5° to 8°.

[0008] The angle between the generatrix of the matching chamfer and the axis of the tire core is 16° to 24°.

[0009] The tire core has two inclined surfaces at one end away from the matching chamfer. The two inclined surfaces are mirror-symmetrical about the plane passing through the tire core axis. The intersection line between the two inclined surfaces is perpendicular to the axis of the wedge pin. The intersection of the two inclined surfaces is a rounded and smooth transition, and the rounded part between the two inclined surfaces is in contact with the wedge pin line.

[0010] The angle between the inclined surface and the tire core axis is 26° to 34°.

[0011] The control component includes screws, which include a lower end screw and an upper end screw. There is a threaded through hole at the axis position of the wedge pin, and the lower end screw and the upper end screw are respectively threadedly connected to the two ends of the wedge pin through the threaded through hole.

[0012] The tire is equipped with gaskets at both ends of the through hole, and matching holes are provided at both ends of the through hole. The diameter of the matching holes is larger than the diameter of the through hole. The gasket is stepped, and the small diameter section of the stepped gasket transitions with the matching hole. The outer diameter of the large diameter section of the stepped gasket is larger than the diameter of the matching hole, so that the large diameter section of the stepped gasket is located outside the matching hole. There is a through hole in the middle of the gasket for the screw to pass through.

[0013] It meets the processing requirements, has the characteristics of high efficiency, high precision and strong applicability, and the product consistency is good.

[0014] In summary, this application has at least the following beneficial technical effects:

[0015] 1) This fixture improves the efficiency of parts clamping and processing, shortening the processing time;

[0016] 2) The fixture has a simple structure, consisting of only five parts, which reduces the complexity and manufacturing cost of tire expansion fixtures;

[0017] 3) The clamp is easy to operate and can be clamped and disassembled by simply tightening or loosening the screws;

[0018] 4) Compared with traditional tire expansion fixtures, this fixture has higher axial precision of processed parts.

[0019] 5) This fixture improves the versatility of tire expansion fixtures and can be used for multiple types of work such as turning, milling, grinding, and clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a two-dimensional cross-sectional view of the oblique wedge tire expansion assembly drawing;

[0021] Figure 2 This is the assembly diagram of the oblique wedge-type tire expansion (3D);

[0022] Figure 3 Schematic diagram of the structure of the wedge pin;

[0023] Figure 4 Schematic diagram of the structure of the gasket;

[0024] Figure 5 is a schematic diagram of the structure of a screw;

[0025] Figure 6 This is a schematic diagram of the tire expansion structure;

[0026] Figure 7 Schematic diagram of the structure of the tire core.

[0027] Explanation of the accompanying figures: 1. Wedge pin; 2. Gasket; 3. Screw; 4. Tire expansion; 5. Tire core. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] The embodiment of the present application discloses a wedge-type tire expansion clamp that can be quickly clamped. Figure 1 and Figure 2 As shown, the inclined wedge-type tire expansion fixture is assembled from five types of parts, including a wedge pin 1, a gasket 2, a screw 3, a tire expansion 4, and a tire core 5. The inner hole of the part can be tightened and clamped by simply turning the screw.

[0030] like Figure 6As shown, there is a through hole for inserting the wedge pin 1 on the middle shaft section of the tire 4; the end of the tire 4 on one side of the through hole is a chuck part, and the other end of the tire 4 is in the shape of a stepped shaft, which includes multiple shaft sections. Among the two adjacent shaft sections, the shaft section close to the right end of the tire 4 has a smaller outer diameter; one end of the stepped shaft of the tire 4 is uniformly distributed with narrow grooves 120° along the circumferential direction, which is the petal part; a mounting hole is opened at the axial position of the tire 4, and the mounting hole is used to install the tire core 5. A limiting hole is set at the right end of the mounting hole. The inner diameter of the limiting hole is smaller than the inner diameter of the mounting hole. The limiting hole and the mounting hole form a step hole, and there is a matching fillet between the step surface between the limiting hole and the mounting hole and the inner wall surface of the limiting hole.

[0031] like Figure 3 As shown, there is a threaded through hole in the middle of the wedge pin 1, which is used to cooperate with the screw 3; the outer circle of the wedge pin 1 has a matching bevel, and the angle between the matching bevel and the axis of the wedge pin 1 is 5° to 8°.

[0032] like Figure 7 As shown, the tire core 5 is an entire shaft segment, the tire core 5 is installed in the mounting hole of the tire expansion 4, and the tire core 5 and the tire expansion 4 are slidably connected along the axial direction of the tire expansion 4; there is a matching chamfer between the end of the tire core 5 close to the expansion petal part and its own circumferential surface, and there are two inclined surfaces at the left end, and the angle between the inclined surface and the axis of the tire core 5 is 26°~34°. The two inclined surfaces are mirror-symmetrical about the plane passing through the axis of the tire core 5, and the intersection line between the two inclined surfaces is perpendicular to the axis of the wedge pin 1. There is a rounded and smooth transition at the intersection of the two inclined surfaces. The rounded part between the two inclined surfaces is in line contact with the wedge pin 1. Specifically, the angle between the generatrix of the matching chamfer and the axis of the tire core 5 is 16°~24°, and the matching chamfer is in contact with the matching fillet inside the tire expansion 4.

[0033] like Figure 4 As shown, the gasket 2 is stepped, with a through hole in the middle for the screw 3 to pass through; the tire 4 is provided with matching holes at both ends of the through hole, the diameter of the matching hole is larger than the diameter of the through hole, two gaskets 2 are provided, and the two gaskets 2 are respectively installed at both ends of the through hole; the small diameter section of the stepped gasket 2 is transitionally matched with the matching hole, so that the gasket 2 will not naturally separate from the tire 4, the outer diameter of the large diameter section of the stepped gasket 2 is larger than the diameter of the matching hole, and the stepped surface between the large diameter section and the small diameter section of the stepped gasket 2 contacts the outer side of the tire 4 at the end of the matching hole to control the installation position of the gasket 2 and the tire 4.

[0034] like Figure 5 As shown, screw 3 is a screw of the tire expansion clamp. Screw 3 includes a lower screw and an upper screw, both of which pass through gasket 2 and are threadedly connected to wedge pin 1, and the lower screw and the upper screw are respectively threadedly connected to the two ends of wedge pin 1.

[0035] like Figure 1As shown, the tire core 5 is installed from the left end hole of the tire 4, and the 20° chamfered end is pressed against the rounded corner of the inner hole of the tire; the wedge pin 1 is installed from the side through hole of the tire 4, and its 5°~8° matching inclined surface is pressed against the rounded corner of the left end of the tire core 5; two gaskets 2 are respectively pressed against the upper and lower ends of the tire 4 to form a transition fit and will not fall off in the natural state; two screws 3 are respectively passed through the holes of the gaskets 2 from both sides and connected with the internal threads of the wedge pin 1.

[0036] The implementation principles of this application are:

[0037] like Figure 1 As shown, in the initial state of the tire expansion clamp, the wedge pin 1 is located in the center of the hole, the right end of the tire core 5 applies a certain tensioning force to the tire, and the expansion petal part of the tire 4 is partially stretched, with a certain tensioning force.

[0038] Loosen the lower screw and move it downward; then tighten the upper screw. At this time, since the tire core 5 is pressed against the inclined surface, the wedge pin 1 is limited and will not rotate. The upper screw will drive the wedge pin 1 and the lower screw to move upward together, and the tire 4 is tightened with the workpiece to complete the clamping, and then tighten the lower screw.

[0039] Similarly, loosening the upper screw causes the upper screw to move upward; tightening the lower screw will cause the wedge pin 1 and the upper screw to move downward together, releasing the tire 4 from the workpiece and completing the disassembly. In this way, clamping and disassembly can be achieved by simply tightening and loosening the screws.

[0040] The left-hand chuck is held by the machine tool. The inner hole of the part is inserted into the expansion disc, which increases its outer diameter to hold the part. After machining is complete, the outer diameter of the expansion disc is reduced, the part is removed, and the next part is clamped in the same way. The fixture position remains unchanged, ensuring consistent dimensions of the finished parts.

[0041] The clamp can be used not only for turning, but also for milling, grinding, locksmithing and other types of work that can fix the chuck.

[0042] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0043] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A quick-install wedge-type tire expansion clamp, characterized by: The invention comprises a wedge pin (1), a tire expansion device (4), a tire core (5) and a control component. A mounting hole is provided at the axis position of the tire expansion device (4). A through hole is provided in the middle of the tire expansion device (4). The axis of the through hole is perpendicular to the axis of the tire expansion device (4). The wedge pin (1) is inserted into the through hole, and the wedge pin (1) is slidably connected to the wedge pin (1) along the axis direction of the through hole. The end of the tire expansion device (4) on one side of the through hole is a stepped shaft. The stepped shaft includes a plurality of shaft sections with different outer diameters. The outer diameters of the different shaft sections gradually decrease in a direction away from the through hole. One end of the stepped shaft of the tire expansion device (4) is uniformly distributed with a plurality of narrow grooves along the circumferential direction to form a petal portion. The tire core (5) The wedge pin (1) is installed in the mounting hole and is located in the stepped shaft; the side of the wedge pin (1) facing the tire core (5) is a matching bevel, the matching bevel and the wedge pin (1) form an acute angle, and the end of the tire core (5) contacts the matching bevel; the mounting hole is provided with a limiting hole at the end of the expansion part, the inner diameter of the limiting hole is smaller than the inner diameter of the mounting hole, and a matching fillet is provided between the step surface between the limiting hole and the mounting hole and the inner wall surface of the limiting hole, and the end of the tire core (5) is provided with a matching chamfer, and the matching fillet contacts the matching chamfer; the control component is connected between the wedge pin (1) and the expansion tire (4) and is used to drive the wedge pin (1) to move along the axial direction of the through hole.

2. The quick-installable wedge-type tire expansion clamp according to claim 1, characterized in that: The included angle between the matching bevel and the axis of the wedge pin (1) is 5° to 8°.

3. The quick-installable wedge-type tire expansion clamp according to claim 1, characterized in that: The angle between the busbar of the matching chamfer and the axis of the tire core (5) is 16° to 24°.

4. The quick-installable wedge-type tire expansion clamp according to claim 1, characterized in that: The tire core (5) has two inclined surfaces at one end away from the matching chamfer. The two inclined surfaces are mirror-symmetrical about a plane passing through the axis of the tire core (5). The intersection line between the two inclined surfaces is perpendicular to the axis of the wedge pin (1). The intersection of the two inclined surfaces is a rounded and smooth transition. The rounded portion between the two inclined surfaces is in line contact with the wedge pin (1).

5. The quick-installable wedge-type tire expansion clamp according to claim 4, characterized in that: The angle between the inclined surface and the axis of the tire core (5) is 26° to 34°.

6. The quick-installable wedge-type tire expansion clamp according to claim 1, characterized in that: The control assembly includes a screw (3), the screw (3) includes a lower end screw and an upper end screw, a threaded through hole is provided at the axis position of the wedge pin (1), and the lower end screw and the upper end screw are respectively threadedly connected to the two ends of the wedge pin (1) through the threaded through hole.

7. The quick-installable wedge-type tire expansion clamp according to claim 1, characterized in that: The tire (4) is provided with gaskets (2) at both ends of the through hole. The tire (4) is provided with matching holes at both ends of the through hole. The diameter of the matching holes is larger than the diameter of the through hole. The gasket (2) is stepped. The small diameter section of the stepped gasket (2) is transitionally matched with the matching hole. The outer diameter of the large diameter section of the stepped gasket (2) is larger than the diameter of the matching hole so that the large diameter section of the stepped gasket (2) is located outside the matching hole. A through hole is provided in the middle of the gasket (2) for the screw (3) to pass through.

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