Coaxiality detection jig convenient for positioning and clamping shaft workpiece

Abstract

The utility model discloses a shaft workpiece coaxiality detection jig convenient for positioning and clamping, which comprises a base and a supporting assembly arranged on the base and used for supporting a shaft workpiece, the shaft workpiece can rotate circumferentially along the axis of the shaft workpiece under the action of the supporting assembly, and the supporting assembly comprises a support fixedly connected with the base. A support mandrel is fixedly arranged on the support, the support mandrel is provided with a support end for sleeving a shaft workpiece, and the support is connected with the base at an included angle, so that a certain included angle is formed between the support mandrel and the base. According to the utility model, rapid clamping and positioning of the shaft workpiece to be detected can be realized through the supporting mandrel which is arranged in a manner of forming a certain clamp with the base, the shaft workpiece can circumferentially rotate along the axis of the shaft workpiece under the action of the supporting mandrel, then the coaxiality of the shaft workpiece to be detected can be conveniently measured through the detection unit, the operation is convenient, and the detection precision is high. On-line detection can be realized, so that the on-line detection efficiency and the detection accuracy are improved, and the product quality is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of inspection tools, and particularly relates to a coaxiality detection fixture for shaft workpieces which is convenient for positioning and clamping. Background Art

[0002] The coaxiality detection of shaft workpieces (such as lead screws, etc.) is an important process for inspecting the machining quality of shaft workpieces. When detecting the coaxiality of a to-be-detected shaft workpiece, most in the industry adopt the three-coordinate detection method. Although the three-coordinate detection method can accurately detect the to-be-detected shaft workpiece, it has a high cost, and it is necessary to send the to-be-detected shaft workpiece from the production line to the detection room to use the three-coordinate detection equipment for detection. For the detection of a large number of shaft workpieces, the detection efficiency is low.

[0003] In addition, a commonly used method for detecting the coaxiality of shaft workpieces is to use a positioning fixture in cooperation with an inspection tool for coaxiality detection. For example, the Chinese utility model patent (publication number: CN206469820U) provides a roundness detection device, including a main slide rail; a fixing device which is arranged on the main slide rail and is used for fixing a to-be-detected workpiece; a detection device which is arranged on the main slide rail; the fixing device includes a first fixing device and a second fixing device; the first fixing device includes a first fixing body, a rotating rod, and a first center point; the second fixing device includes a second fixing body and a second center point; the first center point and the second center point cooperate to fix the to-be-detected workpiece; the detection device includes a dial indicator and a clamping mechanism; the dial indicator includes an indicating disk for displaying readings and a measuring head which contacts the to-be-detected workpiece. It can not only accurately measure the roundness of shaft workpieces, but also accurately measure stepped shafts with different roundness.

[0004] However, the above-mentioned roundness detection device disclosed in the prior art has the following disadvantages: one is that the structure is relatively complex and the cost is high, which is not suitable for the detection of a large number of shaft workpieces; the other is that in the actual detection process, due to product requirements, some shaft workpieces 100, as shown in the attached Figure 1 figure, have a hollow end 101 at one end and cannot cooperate with the center point to fix the shaft workpiece 100, making it difficult to clamp and position the shaft workpiece 100 during coaxiality detection.

[0005] Therefore, it is necessary to improve the prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a coaxiality detection fixture for shaft workpieces which is convenient for positioning and clamping in view of the defects and deficiencies of the prior art. The fixture has a simple structure and is convenient to operate. It can be used for the coaxiality detection of shaft workpieces with a hollow end at one end. It is convenient to clamp and position the shaft workpieces and improves the detection efficiency.

[0007] To achieve the above object, the present utility model adopts the following technical solutions:

[0008] A coaxiality detection fixture for a shaft workpiece that is convenient for positioning and clamping, comprising a base and a support assembly provided on the base for supporting the shaft workpiece. Under the action of the support assembly, the shaft workpiece can rotate circumferentially along its own axis. The support assembly includes a bracket fixedly connected to the base. A support mandrel is fixedly provided on the bracket. The support mandrel is provided with a support end for the shaft workpiece to be sleeved. The support mandrel is coaxial with the shaft workpiece. The bracket is connected to the base at an angle, so that the support mandrel forms a certain angle with the base. A detection unit for measuring the coaxiality of the outer peripheral wall of the shaft workpiece is provided on the bracket.

[0009] Further, the bracket includes a first connecting arm fixedly connected to the base and a second connecting arm perpendicular to the first connecting arm. The first connecting arm is arranged at an angle with the base. The support mandrel is arranged on the first connecting arm.

[0010] Further, a pressing block assembly for fixing the support mandrel is provided on the second connecting arm.

[0011] Further, the pressing block assembly includes a pull rod, a pull ring and a pressing block respectively arranged at both ends of the pull rod. The pressing block is in abutting cooperation with the outer peripheral wall of the support mandrel. An elastic member is sleeved on the pull rod. The elastic member makes the pressing block always have a movement tendency towards abutting against the outer peripheral wall of the support mandrel.

[0012] Further, an arc-shaped groove is provided at one end of the pressing block that abuts against the support mandrel.

[0013] Further, an arc-shaped protrusion is provided on the side surface of the pressing block close to the shaft workpiece.

[0014] Further, the support mandrel is provided with a clamping end for fixedly connecting with the first connecting arm. An installation groove for inserting the clamping end is provided on the first connecting arm.

[0015] Further, a V-shaped groove is provided on one side of the installation groove facing the base.

[0016] Further, a fastening bolt that abuts against the support mandrel is also provided on the first connecting arm.

[0017] Further, the detection unit includes a dial indicator bracket provided on the second connecting arm and a dial indicator provided on the dial indicator bracket. The needle of the dial indicator abuts against the outer peripheral wall of the shaft workpiece.

[0018] After adopting the above structure, the beneficial effects of the present utility model are as follows: A coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping, including a base and a support assembly disposed on the base for supporting the shaft workpiece. Under the action of the support assembly, the shaft workpiece can rotate circumferentially along its own axis. The support assembly includes a bracket fixedly connected to the base, and a support mandrel is fixedly provided on the bracket. The support mandrel is provided with a support end for the shaft workpiece to be sleeved. The bracket is connected to the base at an angle, so that the support mandrel forms a certain angle with the base. The support mandrel arranged at a certain angle with the base can realize the rapid clamping and positioning of the shaft workpiece to be measured. And under the action of the support mandrel, the shaft workpiece can rotate circumferentially along its own axis. Then, through the detection unit, the coaxiality of the shaft workpiece to be measured can be conveniently measured. The operation is convenient, and on-line detection can be realized, which improves the on-line detection efficiency and detection accuracy, and effectively controls the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present utility model, the drawings required for use in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a three-dimensional schematic diagram of the shaft workpiece of the present utility model;

[0021] Figure 2 is an overall structure schematic diagram of the present utility model (the shaft workpiece is sleeved on the support mandrel);

[0022] Figure 3 is the Figure 2 longitudinal sectional view of the present utility model;

[0023] Figure 4 is the Figure 3 enlarged schematic diagram of the structure at position A of the present utility model;

[0024] Figure 5 is an overall structure schematic diagram of the present utility model (the shaft workpiece is not sleeved on the support mandrel);

[0025] Figure 6 is an exploded schematic diagram of the support assembly and the pressing block assembly of the present utility model;

[0026] Figure 7 is a three-dimensional schematic diagram of the bracket of the present utility model;

[0027] Figure 8 is a three-dimensional schematic diagram of the pressing block assembly of the present utility model.

[0028] Figures 1 to 8 The reference numerals are as follows:

[0029] 1. Base; 2. Support assembly; 21. Bracket; 211. First connecting arm; 2111. Installation groove; 2112. V-shaped groove; 2113. Fastening bolt; 212. Second connecting arm; 22. Support mandrel; 221. Support end; 222. Clamping end; 3. Detection unit; 31. Dial indicator bracket; 32. Dial indicator; 321. Needle; 322. Pressure bar; 4. Press block assembly; 41. Pull rod; 42. Pull ring; 43. Press block; 431. Arc groove; 432. Arc protrusion; 44. Elastic member; 100. Shaft workpiece; 101. Hollow end. Specific embodiments

[0030] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0031] In the description of the present utility model, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0032] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present utility model, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present utility model are only for the purpose of illustration and do not represent the only implementation manner.

[0036] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] Such as Figures 1 to 8As shown in the figure, a coaxiality detection jig for shaft workpieces that is convenient for positioning and clamping includes a base 1 and a support assembly 2 disposed on the base 1 for supporting the shaft workpiece 100. Under the action of the support assembly 2, the shaft workpiece 100 can rotate circumferentially along its own axis. The support assembly 2 includes a bracket 21 fixedly connected to the base 1. A support mandrel 22 is fixedly provided on the bracket 21. The support mandrel 22 is provided with a support end 221 for the shaft workpiece 100 to be sleeved. The support mandrel 22 is coaxial with the shaft workpiece 100. The bracket 21 is connected to the base 1 at an angle so that the support mandrel 22 forms a certain angle with the base 1. A detection unit 3 for measuring the coaxiality of the outer peripheral wall of the shaft workpiece 100 is provided on the bracket 21. The bracket 21 includes a first connecting arm 211 fixedly connected to the base 1 and a second connecting arm 212 perpendicular to the first connecting arm 211. The first connecting arm 211 is disposed at an angle with the base 1. The support mandrel 22 is disposed on the first connecting arm 211.

[0038] Based on the above embodiments, what the present invention aims to solve is to provide a coaxiality detection jig for shaft workpieces that is convenient for positioning and clamping, including a base 1 and a support assembly 2 disposed on the base 1 for supporting the shaft workpiece 100. Under the action of the support assembly 2, the shaft workpiece 100 can rotate circumferentially along its own axis. The support assembly 2 includes a bracket 21 fixedly connected to the base 1. A support mandrel 22 is fixedly provided on the bracket 21. The support mandrel 22 is provided with a support end 221 for the shaft workpiece 100 to be sleeved. The bracket 21 is connected to the base 1 at an angle so that the support mandrel 22 forms a certain angle with the base 1. By setting the support mandrel 22 at a certain angle with the base, rapid clamping and positioning of the shaft workpiece 100 to be measured can be achieved. And under the action of the support mandrel 22, the shaft workpiece 100 can rotate circumferentially along its own axis. Then, the coaxiality of the shaft workpiece 100 to be measured can be conveniently measured through the detection unit 3. The operation is convenient, which improves the online inspection efficiency and detection accuracy and can effectively control the product quality. During specific measurement, press the pressing rod 322 of the dial indicator 32 so that the needle 321 of the dial indicator 32 retracts. Sleeve the hollow end 101 of the shaft workpiece 100 onto the support end 221 of the support mandrel 22. Since the support mandrel 22 forms a certain angle with the base 1, the shaft workpiece 100 can be directly supported and positioned by the support mandrel 22 without other clamping operations. Release the pressing of the pressing rod 322 of the dial indicator 32 so that the needle 321 abuts against the outer peripheral wall of the shaft workpiece 100. Then slowly rotate the shaft workpiece 100 so that the shaft workpiece 100 rotates circumferentially around its own axis for one circle. The value of the coaxiality of the shaft workpiece 100 can be obtained through the reading change of the dial indicator 32.

[0039] In this embodiment, considering ergonomics, the included angle formed by the support mandrel 22 and the base 1 is 30 - 80°. The setting of this included angle should facilitate the clamping and positioning of the shaft workpiece 100, and at the same time facilitate the operation of the measuring personnel to rotate the shaft workpiece 100. In a further embodiment, the angle of this included angle is set to 45°.

[0040] As another preferred solution of the present utility model, a pressing block assembly 4 for fixing the support mandrel 22 is provided on the second connecting arm 212. The pressing block assembly 4 includes a pull rod 41, pull rings 42 respectively arranged at both ends of the pull rod 41, and a pressing block 43. The pressing block 43 is in abutting cooperation with the outer peripheral wall of the support mandrel 22. An elastic member 44 is sleeved on the pull rod 41, and the elastic member 44 makes the pressing block 43 always have a movement tendency towards abutting against the outer peripheral wall of the support mandrel 22. An arc-shaped groove 431 is provided at one end of the pressing block 43 that abuts against the support mandrel 22. An arc-shaped protrusion 432 is provided on the side surface of the pressing block 43 close to the shaft workpiece 100. In this embodiment, as Figure 1 and the same Figure 2 shown, the pressing block 43 abuts against the outer peripheral wall of the support mandrel 22, which plays a role in fixing the support mandrel 22 and preventing the support mandrel 22 from shaking. The design of the arc-shaped groove 431 makes the pressing block 43 fit better with the outer peripheral wall of the support mandrel 22, and better plays a fixing role. The setting of the arc-shaped protrusion 432 reduces the contact area between the end of the shaft workpiece 100 and the surface of the pressing block 43, thereby reducing the friction force when rotating the shaft workpiece 100 and making the rotation of the shaft workpiece 100 smoother.

[0041] As another preferred solution of the present utility model, the support mandrel 22 is provided with a clamping end 222 for fixedly connecting with the first connecting arm 211. An installation groove 2111 for inserting the clamping end 222 is opened on the first connecting arm 211. A V-shaped groove 2112 is provided on one side of the installation groove 2111 facing the base 1. A fastening bolt 2113 that abuts against the support mandrel 22 is further provided on the first connecting arm 211. In this embodiment, as Figure 4 and Figure 6 shown, the support mandrel 22 is installed on the first connecting arm 211 through the clamping end 222, and the clamping end 222 is locked and fixed by the fastening bolt 2113. When different shaft workpieces 100 to be measured need to be measured, at this time, the support mandrel 22 needs to be replaced. Loosen the fastening bolt 2113, then take out the support mandrel 22, replace it with a support mandrel 22 adapted to the inner diameter of the hollow end 101, and then tighten the fastening bolt 2113 to lock and position the clamping end 222 of the support mandrel 22. In this embodiment, as Figure 7 shown, the design of the V-shaped groove 2112 is to facilitate the replacement of the support mandrel 22.

[0042] As another preferred solution of the present utility model, the detection unit 3 includes a dial indicator bracket 31 disposed on the second connecting arm 212 and a dial indicator 32 disposed on the dial indicator bracket 31. The needle 321 of the dial indicator 32 abuts against the outer peripheral wall of the shaft workpiece 100. In this embodiment, as Figure 2 shown, the first connecting arm 211 and the second connecting arm 212 are perpendicularly arranged. The shaft workpiece 100 is connected to the first connecting arm 211, and the dial indicator 32 is connected to the second connecting arm 212. During detection, the needle 321 of the dial indicator 32 abuts against the outer peripheral wall of the shaft workpiece 100. The shaft workpiece 100 is slowly rotated so that the shaft workpiece 100 rotates one circle circumferentially along its own axis. Then, the coaxiality of the shaft workpiece 100 to be measured is measured by the dial indicator 32. In this embodiment, when measuring the coaxiality of shaft workpieces 100 with different outer diameters, it can be achieved by adjusting the position of the dial indicator 32 on the dial indicator bracket 31. In this embodiment, a dial indicator 32 can be used for measurement, or other well-known measuring instruments in the art such as a micrometer can also be used.

[0043] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A coaxiality detection jig for an axial workpiece that is convenient for positioning and clamping, comprising a base (1) and a support assembly (2) disposed on the base (1) for supporting the axial workpiece (100), wherein the axial workpiece (100) can rotate circumferentially along its own axis under the action of the support assembly (2), and characterized in that: The support assembly (2) comprises a support (21) fixedly connected to the base (1); a support mandrel (22) is fixedly arranged on the support (21); the support mandrel (22) is provided with a support end (221) for the shaft workpiece (100) to be sleeved; the support mandrel (22) is coaxial with the shaft workpiece (100); the support (21) is connected to the base (1) at an angle so that the support mandrel (22) and the base (1) form a certain angle; and a detection unit (3) for measuring the coaxiality of the outer peripheral wall of the shaft workpiece (100) is provided on the support (21).

2. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 1 is characterized in that: The bracket (21) comprises a first connecting arm (211) fixedly connected to the base (1) and a second connecting arm (212) arranged perpendicularly to the first connecting arm (211); the first connecting arm (211) and the base (1) are arranged at an angle; and the supporting core shaft (22) is arranged on the first connecting arm (211).

3. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 2 is characterized in that: The second connecting arm (212) is provided with a pressing block assembly (4) for fixing the supporting core shaft (22).

4. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 3 is characterized in that: The pressure block assembly (4) comprises a pull rod (41), pull rings (42) and a pressure block (43) respectively arranged at both ends of the pull rod (41); the pressure block (43) is in abutment with the outer peripheral wall of the support core shaft (22); an elastic member (44) is sleeved on the pull rod (41); the elastic member (44) enables the pressure block (43) to always have a movement tendency towards being in abutment with the outer peripheral wall of the support core shaft (22).

5. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 4 is characterized in that: An arc-shaped groove (431) is provided at one end of the pressing block (43) that abuts against the supporting core shaft (22).

6. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 4 is characterized in that: An arc-shaped protrusion (432) is provided on the side surface of the pressing block (43) close to the shaft workpiece (100).

7. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 2 is characterized in that: The support core shaft (22) is provided with a clamping end (222) for fixedly connecting to the first connecting arm (211), and the first connecting arm (211) is provided with a mounting groove (2111) for inserting the clamping end (222).

8. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 7 is characterized in that: A V-shaped groove (2112) is provided on one side of the installation groove (2111) facing the base (1).

9. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 2 is characterized in that: The first connecting arm (211) is also provided with a fastening bolt (2113) which is arranged to abut against the supporting core shaft (22).

10. The coaxiality detection fixture for shaft workpieces that is convenient for positioning and clamping according to claim 2 is characterized in that: The detection unit (3) comprises a dial gauge bracket (31) arranged on the second connecting arm (212) and a dial gauge (32) arranged on the dial gauge bracket (31), wherein a needle head (321) of the dial gauge (32) is disposed against an outer peripheral wall of the shaft workpiece (100).

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