Inner cavity detection core rod with tensioning function

Abstract

The utility model discloses an inner cavity detection core rod with a tensioning function, and relates to the field of automobile part detection, the inner cavity detection core rod comprises a core rod body, a tensioning block, a tensioning seat, a tensioning column and a base, the core rod body is detachably connected to the base, the periphery of the core rod body is sleeved with the tensioning seat and the tensioning column, and the tensioning column is arranged in an inner cavity of the tensioning seat; a plurality of sliding grooves are evenly formed in the outer wall of the tensioning base and communicated with an inner cavity of the tensioning base, a tensioning block is arranged in each sliding groove in a sliding mode, the tensioning blocks and the outer wall of the tensioning column form conical surface fit, and when the tensioning column is pushed upwards, the tensioning blocks slide outwards in the radial direction of the sliding grooves under the action of the conical surfaces, so that the inner cavity wall of the workpiece to be detected is tensioned. According to the utility model, the tensioning block is used for tensioning and attaching to the inner cavity of the cylindrical shell, so that the detection is stable and reliable, meanwhile, inner cavity bottom inclined plane structures such as a bell-shaped shell, a three-column shell and the cylindrical shell of the driving shaft can be stably positioned, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts detection, in particular to an inner cavity detection core rod with a tensioning function. Background Art

[0002] The cylindrical shell is an indispensable key component in the constant velocity universal joint, and its dimensional accuracy has high requirements on drawings. In the prior art, the inner cavity thickness of the cylindrical shell is detected by a cylindrical mandrel that can support the bottom of its inner cavity. The length of the cylindrical mandrel is A. After being placed in the shell, the height B of the shell detection plane is measured with a height gauge. The inner cavity thickness = shell height B-mandrel length A.

[0003] However, the bottom of the inner cavity of the cylindrical shell is an inclined surface, and the use of a cylindrical core rod for positioning is unstable and prone to shaking, making it impossible to accurately measure the thickness of the inner cavity. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and to provide an inner cavity detection core rod with a tightening function, which utilizes a tightening block to tighten and fit the inner cavity of a cylindrical shell to ensure stable and reliable detection. At the same time, it can stably position the inclined surface structures at the bottom of the inner cavity such as a driving shaft bell shell, a three-column shell, and a cylindrical shell, and has a wide range of applications.

[0005] The purpose of the utility model is achieved through the following technical solutions: this inner cavity detection core rod with a tightening function comprises a core rod body, a tightening block, a tightening seat, a tightening column and a base, the core rod body is detachably connected to the base, the tightening seat and the tightening column are sleeved on the outer periphery of the core rod body, and the tightening column is placed in the inner cavity of the tightening seat; a plurality of slide grooves are evenly arranged along the outer wall of the tightening seat, the slide grooves are connected with the inner cavity of the tightening seat, a tightening block is slidably arranged in each slide groove, the tightening block and the outer wall of the tightening column form a conical surface, when the tightening column is pushed upward, the tightening block slides radially outward along the slide groove under the action of the conical surface, thereby tightening the inner cavity wall of the workpiece to be tested.

[0006] As a further technical solution, a first conical surface is arranged on a side of the tension block facing the tension column. The tension column is in a truncated cone shape, and a second conical surface matching the first conical surface is arranged on an outer wall thereof.

[0007] As a further technical solution, the core rod body and the tensioning column are fixed by threaded connection.

[0008] As a further technical solution, a positioning boss is provided at one end of the core rod body away from the base, and the diameter of the positioning boss is consistent with the positioning measurement diameter required on the product drawing of the workpiece to be measured. When the core rod body is placed into the inner cavity of the workpiece to be measured, the positioning boss is positioned on the bottom inclined surface of the inner cavity of the workpiece to be measured.

[0009] As a further technical solution, the number of the tensioning blocks matches that of the sliding slots, and both are three or four.

[0010] As a further technical solution, the workpiece to be measured is a cylindrical shell, a bell-shaped shell or a three-column shell, and the core rod body and the tensioning block are replaced accordingly according to the type and specification of the workpiece to be measured.

[0011] The beneficial effects of the utility model are:

[0012] 1. The conical surface of the tensioning column and the tensioning block is used to tighten the inner wall of the workpiece to be measured, so as to avoid the shaking of the mandrel body during measurement;

[0013] 2. The inner cavity detection mandrel of the tightening function can be made into a universal detection tooling according to the size requirements of the product drawing. By replacing the positioning mandrel or the tightening block, a series of products can be detected, realizing the universalization of tooling, reducing the cost of tooling production, and improving the detection efficiency;

[0014] 3. For the bell-shaped shell, three-column shell, cylindrical shell and other inner cavity bottom inclined structures, the positioning can be stable, the thickness can be measured quickly, and the detection is efficient, accurate and convenient;

[0015] 4. It can be designed into three-claw or four-claw type according to the inner structure of the shell, so as to match the workpiece with six or eight channels to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the utility model (with the tensioning seat hidden).

[0018] Figure 3 It is a schematic cross-sectional structural diagram of the tensioning seat in the utility model.

[0019] Figure 4 It is a cross-sectional structural schematic diagram of the utility model.

[0020] Figure 5 It is a schematic diagram of the structure of the utility model when performing detection.

[0021] Figure 6 for Figure 5 AA section view.

[0022] Figure 7 This is a schematic diagram of the structure of the utility model and the workpiece to be measured after being tightened (with the base hidden).

[0023] Explanation of the accompanying reference numerals: core rod body 1, positioning boss 11, tensioning block 2, first conical surface 21, tensioning seat 3, slide groove 31, through hole 32, tensioning column 4, second conical surface 41, base 5, workpiece to be measured 6, inner cavity bottom inclined surface 61, inner cavity wall 62. DETAILED DESCRIPTION

[0024] The utility model will be described in detail below with reference to the accompanying drawings:

[0025] Example: As attached Figures 1 to 7 As shown, the inner cavity detection core rod with tensioning function includes a core rod body 1, a positioning boss 11, a tensioning block 2, a first conical surface 21, a tensioning seat 3, a slide groove 31, a through hole 32, a tensioning column 4, a second conical surface 41, a base 5, a workpiece to be measured 6, an inner cavity bottom inclined surface 61 and an inner cavity wall 62.

[0026] Reference Figure 1 , 2 4, the mandrel body 1 is detachably connected to the base 5 to play a supporting and fixing role, and the tension seat 3 and the tension column 4 are sequentially sleeved on the outer periphery of the mandrel body 1, and the tension column 4 is placed in the inner cavity of the tension seat 3. Figure 3 As shown, four slide grooves 31 (four in this embodiment, or other numbers) are evenly arranged along the outer wall of the tension seat 3, the slide grooves 31 are connected to the inner cavity of the tension seat 3, and a tension block 2 is slidably arranged in each slide groove 31, as shown in FIG. Figure 4 The tension block 2 is provided with a first conical surface 21 on one side facing the tension column 4. The tension column 4 is in a truncated cone shape. A second conical surface 41 matching the first conical surface 21 is provided on its outer wall, so that the tension block 2 and the outer wall of the tension column 4 form a conical surface match. When the tension column 4 is pushed upward, each tension block 2 slides radially outward along the slide groove 31 under the action of the conical surface, thereby tightening the inner cavity wall 62 of the workpiece 6 to be measured. The state after tightening is shown in FIG. Figure 7 shown.

[0027] Preferably, the core rod body 1 and the tensioning column 4 are fixed by threaded connection, so that the tensioning column 4 can support the tensioning block 2 and the tensioning seat 3 after being tightened.

[0028] Further, such as Figure 4 , 6 As shown, a positioning boss 11 is radially expanded outward at the top end of the core rod body 1 (i.e., the end away from the base 5). Preferably, the diameter of the positioning boss 11 is consistent with the positioning measurement diameter required on the product drawing of the workpiece 6 to be measured. When the core rod body 1 is placed in the inner cavity of the workpiece 6 to be measured, the positioning boss 11 is positioned on the bottom inclined surface 61 of the inner cavity of the workpiece 6 to be measured, so as to prevent the core rod body 1 from shaking during measurement.

[0029] Preferably, in this embodiment, the workpiece 6 to be measured can be a cylindrical shell, a bell shell or a three-column shell (the inclined surface structure at the bottom of the inner cavity can achieve stable positioning), and the mandrel body 1 and the tension block 2 are replaced accordingly according to the type and specification of the workpiece 6 to be measured. For the cylindrical shell, three-column shell or bell shell with six ball channels, it can be designed as a three-claw tension, that is, three slide grooves 31 are opened on the tension seat 3, and three tension blocks 2 are set accordingly. For the cylindrical shell and bell shell with eight ball channels, it can be designed as a four-claw tension, that is, four slide grooves 31 are opened on the tension seat 3, and four tension blocks 2 are set accordingly.

[0030] The inner cavity detection core rod provided in this embodiment can be made into a universal detection tooling according to the size requirements of the product drawing, so that a series of products can be detected by replacing the positioning core rod 1 or the tightening block 2, thereby realizing the universalization of tooling, reducing the tooling production cost and improving the detection efficiency.

[0031] The working process of the utility model is as follows: since the diameter of the positioning boss 11 of the mandrel body 1 is consistent with the positioning measurement diameter (i.e. the diameter of the bottom inclined surface 61 of the inner cavity) required on the product drawing of the cylindrical shell (the workpiece to be tested 6), during the test, the inner cavity detection mandrel is placed in the inner cavity of the cylindrical shell, and the tensioning column 4 is rotated and pushed up to make the tensioning block 2 fit with the inner cavity wall 62 of the cylindrical shell (the fitting effect is as shown in FIG. Figure 7 As shown in the figure, while the cylindrical shell is tightened, the positioning boss 11 is stably positioned on the inclined surface 61 at the bottom of the inner cavity to ensure that the core rod body 1 will not shake left and right.

[0032] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. An inner cavity detection mandrel with a tensioning function, characterized in that: The invention comprises a core rod body (1), a tensioning block (2), a tensioning seat (3), a tensioning column (4) and a base (5); the core rod body (1) is detachably connected to the base (5); the tensioning seat (3) and the tensioning column (4) are sleeved on the outer periphery of the core rod body (1); and the tensioning column (4) is inserted into the inner cavity of the tensioning seat (3); a plurality of slide grooves (31) are evenly arranged along the outer wall of the tensioning seat (3); the slide grooves (31) are connected with the inner cavity of the tensioning seat (3); a tensioning block (2) is slidably arranged in each slide groove (31); the tensioning block (2) and the outer wall of the tensioning column (4) form a conical surface match; when the tensioning column (4) is pushed upward, the tensioning block (2) slides radially outward along the slide groove (31) under the action of the conical surface, thereby tightening the inner cavity wall (62) of the workpiece (6) to be measured.

2. The inner cavity detection mandrel with a tensioning function according to claim 1, characterized in that: The tension block (2) is provided with a first conical surface (21) on one side facing the tension column (4); the tension column (4) is in a truncated cone shape, and a second conical surface (41) matching the first conical surface (21) is provided on its outer wall.

3. The inner cavity detection mandrel with a tensioning function according to claim 1, characterized in that: The core rod body (1) and the tensioning column (4) are fixed via threaded connection.

4. The inner cavity detection mandrel with a tensioning function according to claim 1, characterized in that: A positioning boss (11) is provided at one end of the mandrel body (1) away from the base (5); the diameter of the positioning boss (11) is consistent with the positioning measurement diameter required on the product drawing of the workpiece (6) to be measured; when the mandrel body (1) is placed in the inner cavity of the workpiece (6) to be measured, the positioning boss (11) is positioned on the bottom inclined surface (61) of the inner cavity of the workpiece (6) to be measured.

5. The inner cavity detection mandrel with a tensioning function according to claim 1, characterized in that: The number of the tensioning blocks (2) and the number of the sliding grooves (31) are matched and are both three or four.

6. The inner cavity detection mandrel with a tensioning function according to claim 1, characterized in that: The workpiece (6) to be measured is a cylindrical shell, a bell-shaped shell or a three-column shell, and the core rod body (1) and the tensioning block (2) are replaced accordingly according to the type and specification of the workpiece (6) to be measured.

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