Internal expansion type fixing device for milling top surface of end cover

Abstract

The internal expansion type fixing device for milling the top face of the end cover comprises a bottom plate, a supporting cylinder and an internal expansion assembly, the lower end of the supporting cylinder is connected to the bottom plate, the upper end of the supporting cylinder vertically extends upwards and is used for coaxially sleeving the end cover, and the diameter of an inner cavity of the supporting cylinder is smaller than that of a center hole in the end cover; the axial ejector rod is arranged in the inner cavity and can move up and down, the radial hole is formed in the upper end of the supporting cylinder and extends in the radial direction, the radial ejector rod is arranged in the radial hole in a penetrating mode and can move inside and outside, the upper end of the axial ejector rod is a big-end-down head-removed conical part, and the lower end of the axial ejector rod is spaced from the bottom plate; the radial holes are communicated with the inner cavity and penetrate through the outer wall face of the supporting cylinder, the radial holes are evenly distributed around the axis of the supporting cylinder, the length of the radial ejector rod is larger than that of the radial holes, the inner end of the radial ejector rod abuts against the outer wall face of the head-removed conical part, and when the axial ejector rod moves upwards, the radial ejector rod can be pushed outwards through the outer wall face of the head-removed conical part. Therefore, the inner wall of the end cover is abutted, and internal expansion type fixation is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of fixing jigs, and in particular relates to an internal expansion type fixing device for milling the top surface of an end cover. Background Art

[0002] End caps are common mechanical parts, usually stamped from thin plates. There is an end cap (mobile phone camera protective cover) such as Figure 1 and Figure 2 As shown, the end cover has a diameter of about 13 mm, a height of 3 mm, a wall thickness of 0.15 mm, a ring-shaped top, and a center hole. Due to the large thickness tolerance of the stamping raw material plate, the top surface of the end cover needs to be fine-milled after stamping to make it meet the design dimensions. However, due to process requirements, the outer wall of the end cover cannot be touched after stamping. Therefore, how to fix it for milling becomes a major problem. Utility Model Content

[0003] The purpose of the utility model is to overcome one or more disadvantages in the prior art and to provide an internal expansion type fixing device for milling the top surface of an end cover.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the end cover milling top surface uses an internal expansion type fixing device, comprising:

[0005] Base plate;

[0006] A support tube, the lower end of which is connected to the bottom plate, the upper end of which extends vertically upwards and is used for coaxially sleeved with an end cover, and the inner diameter of the support tube is smaller than the inner diameter of the center hole on the end cover;

[0007] An internal expansion component, which includes an axial push rod, a radial hole and a radial push rod, wherein the axial push rod can be movably arranged in the inner cavity up and down, the upper end of the axial push rod is a truncated cone portion which is smaller at the top and larger at the bottom, the lower end of the axial push rod is spaced apart from the bottom plate, the radial hole is opened at the upper end of the support tube and extends along the radial direction of the support tube, the radial hole is connected with the inner cavity and passes through the outer wall surface of the support tube, there are at least three radial holes and they are evenly distributed around the axis of the support tube, the radial push rod can be movably arranged inwards and outwards in the radial hole, the length of the radial push rod is greater than the length of the radial hole, and the inner end of the radial push rod is tightly pressed against the outer wall surface of the truncated cone portion.

[0008] Preferably, an elastic member is provided between the lower end of the axial push rod and the bottom plate, and the elastic member has a tendency to drive the axial push rod to move upward.

[0009] Further preferably, the lower end surface of the axial push rod is provided with a blind hole extending upward, and the blind hole is used to accommodate the upper end portion of the elastic member.

[0010] Preferably, the inner end of the radial push rod is in line contact with the outer wall surface of the truncated cone portion, and the inner end surface of the radial push rod is an inclined surface extending downward and outward, and the inclination of the inclined surface matches the taper of the truncated cone portion.

[0011] Further preferably, the inner end of the radial push rod is in surface contact with the outer wall surface of the truncated cone portion, and the middle portion of the inclined surface is concave to form an inner concave surface matching the outer wall surface of the truncated cone portion.

[0012] Preferably, the outer end of the radial push rod is in a ball head shape.

[0013] Preferably, the internal expansion fixing device for the milled top surface of the end cover also includes a limit assembly for limiting the inward and outward movement limit positions of the radial push rod, the limit assembly includes a limit hole, a limit groove and a limit pin, the limit hole is opened on the upper end surface of the support tube, the limit hole corresponds to the radial hole and vertically penetrates the limit hole, the limit groove is opened on the radial push rod and is located below the limit hole, the groove width of the limit groove in the radial direction of the support tube is greater than the inner diameter of the limit hole, and the limit pin is embedded in the limit hole and extends into the limit groove.

[0014] Further preferably, the upper end surface of the limit pin is not higher than the upper end surface of the support tube.

[0015] Further preferably, the limiting hole is located on the inner side of the central hole on the cover plate.

[0016] Preferably, there are four radial holes, and the cross-section of the radial holes is circular.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The utility model provides an internal expansion fixing device for the milling top surface of an end cover, comprising a base plate, a support tube, and an internal expansion assembly, wherein the lower end of the support tube is connected to the base plate, and the upper end thereof vertically extends upward for coaxially sleeved with the end cover, and the inner cavity diameter of the support tube is smaller than the diameter of the center hole on the end cover; the inner expansion assembly comprises an axial push rod movably arranged in the inner cavity, a radial hole opened at the upper end of the support tube and extending radially, and a radial push rod movably arranged in the radial hole inwardly and outwardly, the upper end of the axial push rod is a headless cone portion which is smaller at the top and larger at the bottom, and the lower end is spaced apart from the base plate, the radial hole is connected with the inner cavity and passes through the outer wall surface of the support tube, there are at least three radial holes which are evenly distributed around the axis of the support tube, the length of the radial push rod is greater than the length of the radial hole, and the inner end thereof is tightly pressed against the outer wall surface of the headless cone portion, and when the axial push rod moves upward, the radial push rod can be pushed outwardly through the outer wall surface of the headless cone portion, thereby pressing against the inner wall of the end cover to realize internal expansion fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , Figure 2 It is a three-dimensional schematic diagram of the end cover of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of a preferred embodiment of the utility model.

[0021] Figure 4 yes Figure 3 A three-dimensional schematic diagram with the end caps removed.

[0022] Figure 5 yes Figure 4 A three-dimensional schematic diagram after the support tube is hidden.

[0023] Figure 6 yes Figure 3 Schematic top view of .

[0024] Figure 7 yes Figure 6 Schematic diagram of the cross-section in the AA direction. The view angle is adjusted for easy observation.

[0025] Among them: 1. end cover; 2. center hole; 3. top surface; 10. bottom plate; 20. support tube; 21. inner cavity; 30. internal expansion component; 31. axial push rod; 311. headless cone; 312. blind hole; 32. radial hole; 33. radial push rod; 331. inclined surface; 40. elastic part; 50. limit assembly; 51. limit hole; 52. limit groove; 53. limit pin. DETAILED DESCRIPTION

[0026] The utility model provides an internal expansion type fixing device for milling the top surface of an end cover, comprising: a bottom plate 10, a support tube 20, and an internal expansion assembly 30, wherein the bottom plate 10 extends in the horizontal direction; the lower end of the support tube 20 is connected to the bottom plate 10, and the upper end of the support tube 20 extends vertically upward for coaxially sleeved with the end cover 1, and the diameter of the inner cavity 21 of the support tube 20 is smaller than the inner diameter of the center hole 2 on the end cover 1; the internal expansion assembly 30 comprises an axial push rod 31, a radial hole 32 and a radial push rod 33, the axial push rod 31 can be movably arranged in the inner cavity 21 up and down, the upper end of the axial push rod 31 is a headless conical portion 311 with a small upper part and a large lower part, and the lower end of the axial push rod 31 is connected to the bottom plate 1 0, a radial hole 32 is opened at the upper end of the support tube 20 and extends in the radial direction of the support tube 20, the radial hole 32 is connected with the inner cavity 21 of the support tube 20 and passes through the outer wall of the support tube 20, there are four radial holes 32 and they are evenly distributed around the axis of the support tube 20, the cross section of the radial hole 32 is circular, and the radial push rod 33 can be movably arranged in the radial hole 32 inwardly and outwardly, the length of the radial push rod 33 is greater than the length of the radial hole 32, in the initial position, the outer end of the radial push rod 33 is completely retracted into the radial hole 32 (does not protrude from the outer wall of the support tube 20), and the inner end of the radial push rod 33 is tightly pressed against the outer wall of the headless cone 311.

[0027] The advantage of such a configuration is that when the axial push rod 31 moves upward, the radial push rod 33 can be pushed outward through the outer wall of the headless cone portion 311, so that the outer end of the radial push rod 33 is pressed against the inner wall of the end cover 1, achieving internal expansion fixation and facilitating the fine milling of the top surface 3 of the end cover 1.

[0028] In this embodiment, an elastic member 40 is provided between the lower end of the axial push rod 31 and the bottom plate 10 . The elastic member 40 has a tendency to drive the axial push rod 31 to move upward, and the elastic member 40 is a spring.

[0029] To improve stability, further, a blind hole 312 extending upward is provided on the lower end surface of the axial push rod 31 , and the blind hole 312 is used to accommodate the upper end of the elastic member 40 .

[0030] To improve the pushing stability, in the present embodiment, the contact between the inner end of the radial push rod 33 and the outer wall surface of the truncated cone portion 311 is preferably line contact. Specifically, the inner end surface of the radial push rod 33 is an inclined surface 331 extending downward and outward, and the inclination of the inclined surface 331 matches the taper of the truncated cone portion 311.

[0031] In another embodiment, in order to further improve the pushing stability, the inner end of the radial push rod 33 is in surface contact with the outer wall of the truncated cone portion 311. Specifically, based on the present embodiment, the middle part of the inclined surface 331 is concave to form an inner concave surface matching the outer wall of the truncated cone portion 311.

[0032] In this embodiment, the outer end of the radial push rod 33 is in a ball head shape to reduce the contact surface with the inner wall surface of the end cover 1 during internal expansion and fixing.

[0033] In this embodiment, the internal expansion fixing device for the milled top surface of the end cover also includes a limit assembly 50 for limiting the inner and outer movement limit positions of the radial push rod 33. The limit assembly 50 includes a limit hole 51, a limit groove 52 and a limit pin 53. The limit hole 51 is opened on the upper end surface of the support tube 20 and extends downward. The limit hole 51 corresponds to the radial hole 32 and is vertically penetrated. The limit groove 52 is opened on the radial push rod 33 and is located below the limit hole 51. The groove width of the limit groove 52 in the radial direction of the support tube 20 is greater than the inner diameter of the limit hole 51. The limit pin 53 is embedded in the limit hole 51 and extends into the limit groove 52.

[0034] To avoid interference, the upper end surface of the limiting pin 53 is flush with the upper end surface of the supporting tube 20 . Meanwhile, the limiting hole 52 is located on the inner side of the central hole 2 on the cover plate 1 .

[0035] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An internal expansion type fixing device for milling the top surface of an end cover, characterized in that: include: Base plate; A support tube, the lower end of which is connected to the bottom plate, the upper end of which extends vertically upwards and is used for coaxially sleeved with an end cover, and the inner diameter of the support tube is smaller than the inner diameter of the center hole on the end cover; An internal expansion component, which includes an axial push rod, a radial hole and a radial push rod, wherein the axial push rod can be movably arranged in the inner cavity up and down, the upper end of the axial push rod is a truncated cone portion which is smaller at the top and larger at the bottom, the lower end of the axial push rod is spaced apart from the bottom plate, the radial hole is opened at the upper end of the support tube and extends along the radial direction of the support tube, the radial hole is connected with the inner cavity and passes through the outer wall surface of the support tube, there are at least three radial holes and they are evenly distributed around the axis of the support tube, the radial push rod can be movably arranged inwards and outwards in the radial hole, the length of the radial push rod is greater than the length of the radial hole, and the inner end of the radial push rod is tightly pressed against the outer wall surface of the truncated cone portion.

2. The internal expansion type fixing device for milling the top surface of the end cover according to claim 1, characterized in that: An elastic member is provided between the lower end of the axial push rod and the bottom plate, and the elastic member has a tendency to drive the axial push rod to move upward.

3. The internal expansion type fixing device for milling the top surface of the end cover according to claim 2, characterized in that: The lower end surface of the axial push rod is provided with a blind hole extending upward, and the blind hole is used to accommodate the upper end portion of the elastic member.

4. The internal expansion type fixing device for milling the top surface of the end cover according to claim 1, characterized in that: The inner end of the radial push rod is in line contact with the outer wall surface of the headless cone portion, and the inner end surface of the radial push rod is an inclined surface extending downward and outward, and the inclination of the inclined surface matches the taper of the headless cone portion.

5. The internal expansion type fixing device for milling the top surface of the end cover according to claim 4, characterized in that: The inner end of the radial push rod is in surface contact with the outer wall surface of the headless cone portion, and the middle part of the inclined surface is concave to form an inner concave surface matching the outer wall surface of the headless cone portion.

6. The internal expansion type fixing device for milling the top surface of the end cover according to claim 1, characterized in that: The outer end of the radial push rod is in a ball head shape.

7. The internal expansion type fixing device for milling the top surface of the end cover according to claim 1, characterized in that: The internal expansion fixing device for milling the top surface of the end cover also includes a limit assembly for limiting the inner and outer movement limit positions of the radial push rod, the limit assembly includes a limit hole, a limit groove and a limit pin, the limit hole is opened on the upper end surface of the support tube, the limit hole corresponds to the radial hole and vertically penetrates, the limit groove is opened on the radial push rod and is located below the limit hole, the groove width of the limit groove in the radial direction of the support tube is greater than the inner diameter of the limit hole, and the limit pin is embedded in the limit hole and extends into the limit groove.

8. The internal expansion type fixing device for milling the top surface of the end cover according to claim 7, characterized in that: The upper end surface of the limiting pin is not higher than the upper end surface of the supporting tube.

9. The internal expansion type fixing device for milling the top surface of the end cover according to claim 7, characterized in that: The limiting hole is located on the inner side of the central hole on the end cover.

10. The internal expansion type fixing device for milling the top surface of the end cover according to claim 1, characterized in that: There are four radial holes, and the cross-section of the radial holes is circular.

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