A high-precision automotive sheet metal part inspection fixture

Abstract

The present invention relates to the technical field of automotive inspection tools, and particularly relates to a high-precision automotive sheet metal part inspection tool, which includes an inspection tool body and a flipping device provided on the inspection tool body; the flipping device includes a flipping base, a swing arm, and a profile block; a receiving cavity is provided inside the swing arm; a piston member is movably provided in the receiving cavity; an oil cavity is formed between the piston member and the receiving cavity; a first lower bushing is provided at the bottom of the swing arm; a lower pump cavity is provided in the first lower bushing; a lower locking pin is telescopically and movably provided in the lower pump cavity; the swing arm is provided with a first upper bushing at the top of the first lower bushing; an upper pump cavity is provided in the first upper bushing; an upper locking pin is telescopically and movably provided in the upper pump cavity; the oil cavity, the upper pump cavity, and the lower pump cavity are communicated. By changing the positioning method between the swing arm and the flipping base from pin positioning to conical surface abutment positioning, the conical surfaces are disengaged during the flipping process of the swing arm, and no wear will occur, thereby improving the accuracy retention ability of the flipping device.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive inspection fixtures, and particularly to a high-precision automotive sheet metal part inspection fixture. Background Art

[0002] An automotive sheet metal inspection fixture is a measuring tool used to check the sizing and positioning dimensions of automotive sheet metal parts; due to the complex structure of automotive sheet metal parts, in order to facilitate the loading and unloading and measurement operations of the sheet metal parts to be measured, a turning mechanism is often used on the inspection fixture to connect the profile block. When loading and unloading the sheet metal parts to be measured, the profile block is turned to the outside of the placement area of the sheet metal parts to be measured to leave a larger operating space for facilitating the loading and unloading of the sheet metal parts to be measured; on the one hand, the X-direction limit of the existing turning mechanism is achieved by the end face of the turning arm abuting against the guide sleeve, and the Y-direction limit is achieved by coaxially inserting the guide sleeve on the support seat and the guide sleeve on the turning arm with a pin; due to the large friction force between the end face of the turning arm and the guide sleeve during the turning process of the turning mechanism, and there is also friction between the hinge hole of the turning arm and the hinge shaft, the above positions of the turning mechanism are prone to accuracy degradation due to wear, resulting in a reduction in the accuracy of the entire sheet metal inspection fixture; on the other hand, since the existing turning mechanism is positioned by coaxially inserting the guide sleeve on the support seat and the guide sleeve on the turning arm with a pin, and the turning arm and the support seat are rigidly connected, when the profile block is impacted by an external force, since the position cannot be changed to form a buffer, it is easy to cause damage or displacement of the profile block, resulting in a reduction in the detection accuracy of the inspection fixture. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-precision automotive sheet metal part inspection fixture for the above deficiencies in the prior art.

[0004] The purpose of the present invention is achieved through the following technical solutions: A high-precision automotive sheet metal part inspection fixture includes an inspection fixture body and a turning device provided on the inspection fixture body;

[0005] The turning device includes a turning seat, a swing arm, and a profile block; the bottom of the swing arm is rotatably provided on the turning seat; the profile block is provided on the top of the swing arm;

[0006] A receiving cavity is provided inside the swing arm; a piston member is hermetically and vertically movably provided inside the receiving cavity; an oil cavity is formed between the bottom of the piston member and the receiving cavity;

[0007] A first lower bushing is provided at the bottom of the swing arm; a lower pump cavity is provided in the first lower bushing; a lower locking pin is telescopically and movably provided in the lower pump cavity; a second lower bushing is provided at the bottom of the turning seat; the lower locking pin is provided with a first lower conical surface; the second lower bushing is provided with a second lower conical surface for abutting against the first lower conical surface;

[0008] The swing arm is provided with a first upper bushing at the top of the first lower bushing; the first upper bushing is provided with an upper pump chamber; the upper pump chamber is provided with a locking pin that can move telescopically; the flipping seat is provided with a second upper bushing; the locking pin is provided with a first upper conical surface; the second upper bushing is provided with a second upper conical surface for abutting against the first upper conical surface.

[0009] The oil chamber, the upper pump chamber and the lower pump chamber are communicated.

[0010] The present invention is further configured such that the number of the locking pins is two; the two locking pins are respectively arranged in the first upper bushing in a sealed and movable manner; the upper pump chamber is formed between the two locking pins; the first upper conical surfaces are provided at the mutually remote ends of the two locking pins; the second upper bushings are provided on both sides of the flipping seat.

[0011] The present invention is further configured such that the number of the lower locking pins is two; the two lower locking pins are respectively arranged in the first lower bushing in a sealed and movable manner; the lower pump chamber is formed between the two lower locking pins; the first lower conical surfaces are provided at the mutually remote ends of the two lower locking pins; the second lower bushings are provided on both sides of the flipping seat.

[0012] The present invention is further configured such that the first lower bushing is rotatably connected to the second lower bushing.

[0013] The present invention is further configured such that a return spring is provided between the bottom of the piston member and the bottom of the accommodating cavity.

[0014] The present invention is further configured such that a piston rod is provided at the top of the piston member; a push rod is movably provided at the top of the piston rod; the push rod is provided with a strip-shaped limiting groove in the height direction; a limiting pin is provided at the top of the piston rod; the limiting pin is movably arranged in the strip-shaped limiting groove; a buffer spring is provided between the bottom of the push rod and the top of the piston member; the stiffness of the buffer spring is greater than the stiffness of the return spring.

[0015] The present invention is further configured such that a fixed plane is provided on one side surface of the top of the push rod; an installation hole is provided in the fixed plane; a knob shaft is rotatably provided in the installation hole; a knob member is connected to the knob shaft after protruding from the swing arm.

[0016] The present invention is further configured such that a ratchet rack is provided on the swing arm in the height direction; a fixed pin is provided on the circumferential surface of the knob member; a fixed boss is provided on the fixed plane; a fixed notch for cooperating with the fixed boss is provided on the side surface of the knob shaft.

[0017] The present invention is further configured such that a limiting through hole is provided on the swing arm in the height direction; the knob shaft is movably arranged in the limiting through hole.

[0018] The present invention is further configured such that the flipping seat is provided with a buffer protection sleeve for cooperating with the locking pin.

[0019] Advantages of the present invention: By changing the positioning method between the swing arm and the flipping seat from pin positioning to conical surface abutment positioning, the conical surfaces are disengaged during the flipping process of the swing arm, without wear, thus improving the accuracy retention ability of the flipping device. Description of the Drawings

[0020] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is a schematic structural diagram of the flipping device of the present invention;

[0023] Figure 3 is a cross-sectional view of the flipping device of the present invention;

[0024] Figure 4 is Figure 3 a partial enlarged view of part A in

[0025] Figure 5 is a cross-sectional view of the flipping device of the present invention from another perspective;

[0026] Figure 6 is Figure 5 a partial enlarged view of part B in

[0027] Figure 7 is a cross-sectional view of the flipping device of the present invention when locked;

[0028] Figure 8 is Figure 7 a partial enlarged view of part C in

[0029] Figure 9 is a schematic structural diagram of the cooperation of the push rod, piston part, knob part and rack of the present invention;

[0030] Figure 10 is a schematic structural diagram of the cooperation of the push rod, piston part, knob part and rack of the present invention from another perspective;

[0031] Wherein: 1. Fixture body; 11. Flipping device; 12. Profiled block; 2. Flipping base; 3. Swing arm; 31. Accommodation cavity; 32. Limiting perforation; 33. Buffer protection sleeve; 4. Piston part; 41. Oil cavity; 42. Return spring; 43. Piston rod; 44. Limiting pin; 5. First lower bushing; 51. Lower pump cavity; 52. Lower locking pin; 53. First lower conical surface; 54. Second lower bushing; 55. Second lower conical surface; 6. First upper bushing; 61. Upper pump cavity; 62. Upper locking pin; 63. First upper conical surface; 64. Second upper bushing; 65. Second upper conical surface; 7. Push rod; 71. Strip-shaped limiting groove; 72. Buffer spring; 8. Fixed plane; 81. Mounting hole; 82. Fixed boss; 91. Knob shaft; 92. Knob part; 93. Ratchet rack; 94. Fixed pin; 95. Fixed notch. Detailed implementation mode

[0032] The present invention will be further described in conjunction with the following embodiments.

[0033] As Figures 1 to 10 can be seen, a high-precision automotive sheet metal part fixture described in this embodiment includes a fixture body 1 and a flipping device 11 provided on the fixture body 1; the flipping device 11 includes a flipping base 2, a swing arm 3 and a profiled block 12; the bottom of the swing arm 3 is rotatably provided on the flipping base 2; the profiled block 12 is provided on the top of the swing arm 3; an accommodation cavity 31 is provided inside the swing arm 3; a piston part 4 is hermetically and vertically movably provided inside the accommodation cavity 31; an oil cavity 41 is formed between the bottom of the piston part 4 and the accommodation cavity 31; a first lower bushing 5 is provided at the bottom of the swing arm 3; a lower pump cavity 51 is provided in the first lower bushing 5; a lower locking pin 52 is telescopically movably provided in the lower pump cavity 51; a second lower bushing 54 is provided at the bottom of the flipping base 2; the lower locking pin 52 is provided with a first lower conical surface 53; the second lower bushing 54 is provided with a second lower conical surface 55 for abutting against the first lower conical surface 53; a first upper bushing 6 is provided on the top of the swing arm 3 at the first lower bushing 5; an upper pump cavity 61 is provided in the first upper bushing 6; an upper locking pin 62 is telescopically movably provided in the upper pump cavity 61; a second upper bushing 64 is provided on the flipping base 2; the upper locking pin 62 is provided with a first upper conical surface 63; the second upper bushing 64 is provided with a second upper conical surface 65 for abutting against the first upper conical surface 63; the oil cavity 41, the upper pump cavity 61 and the lower pump cavity 51 are communicated.

[0034] Specifically, for the high-precision automotive sheet metal part inspection fixture described in this embodiment, lubricating oil is filled between the oil cavity 41, the upper pump cavity 61, and the lower pump cavity 51, and the total amount of the lubricating oil remains consistent. When the swing arm 3 can rotate normally, the piston part 4 is at the top dead center. At this time, the volume of the oil cavity 41 is the largest, resulting in less lubricating oil in the upper pump cavity 61 and the lower pump cavity 51. At this time, under the action of atmospheric pressure, the lower locking pin 52 contracts into the first lower shaft sleeve 5, and the upper locking pin 62 contracts into the first upper shaft sleeve 6. At this time, the swing arm 3 can rotate normally.

[0035] During inspection, after placing the sheet metal part to be measured on the inspection fixture body 1, by rotating the swing arm 3, the swing arm 3 is flipped to the vertical position, and then the piston part 4 is moved downward so that the piston part 4 moves to the bottom dead center. The volume of the oil cavity 41 gradually decreases, and the lubricating oil moves to the upper pump cavity 61 and the lower pump cavity 51, causing the lower locking pin 52 to extend from the first lower shaft sleeve 5 and abut against the second lower shaft sleeve 54, and the upper locking pin 62 to extend from the first upper shaft sleeve 6 and abut against the second upper shaft sleeve 64, thereby fixing the position of the swing arm 3.

[0036] In this embodiment, the positioning method between the swing arm 3 and the flipping seat 2 is changed from pin positioning to conical surface abutment positioning. During the flipping process of the swing arm 3, the conical surfaces are disengaged from contact and no wear will occur, improving the accuracy retention ability of the flipping device 11. At the same time, since the first upper shaft sleeve 6 and the second upper shaft sleeve 64 and the first lower shaft sleeve 5 and the second lower shaft sleeve 54 are positioned by conical surface abutment, even if the rotation between the first lower shaft sleeve 5 and the second lower shaft sleeve 54 wears due to friction, it will not affect the accuracy of the flipping device 11.

[0037] For the high-precision automotive sheet metal part inspection fixture described in this embodiment, the number of the upper locking pins 62 is two; the two upper locking pins 62 are respectively arranged in the first upper shaft sleeve 6 in a sealed and movable manner; the upper pump cavity 61 is formed between the two upper locking pins 62; the first upper conical surfaces 63 are provided at the mutually remote ends of the two upper locking pins 62; the second upper shaft sleeves 64 are provided on both sides of the flipping seat 2. Specifically, the above setting can ensure the stability of the connection between the first upper shaft sleeve 6 and the second upper shaft sleeve 64.

[0038] For the high-precision automotive sheet metal part inspection fixture described in this embodiment, the number of the lower locking pins 52 is two; the two lower locking pins 52 are respectively arranged in the first lower shaft sleeve 5 in a sealed and movable manner; the lower pump cavity 51 is formed between the two lower locking pins 52; the first lower conical surfaces 53 are provided at the mutually remote ends of the two lower locking pins 52; the second lower shaft sleeves 54 are provided on both sides of the flipping seat 2. Specifically, the above setting can ensure the stability of the connection between the first lower shaft sleeve 5 and the second lower shaft sleeve 54.

[0039] A high-precision automotive sheet metal part inspection fixture according to this embodiment, the first lower bushing 5 is rotatably connected to the second lower bushing 54. Through the above arrangement, the swing arm 3 can be rotated on the flipping seat 2.

[0040] A high-precision automotive sheet metal part inspection fixture according to this embodiment, a return spring 42 is provided between the bottom of the piston member 4 and the bottom of the accommodating cavity 31. A high-precision automotive sheet metal part inspection fixture according to this embodiment, a piston rod 43 is provided at the top of the piston member 4; a push rod 7 is movably provided at the top of the piston rod 43; a strip-shaped limiting groove 71 is provided on the push rod 7 in the height direction; a limiting pin 44 is provided at the top of the piston rod 43; the limiting pin 44 is movably arranged in the strip-shaped limiting groove 71; a buffer spring 72 is provided between the bottom of the push rod 7 and the top of the piston member 4; the stiffness of the buffer spring 72 is greater than that of the return spring 42. A high-precision automotive sheet metal part inspection fixture according to this embodiment, the flipping seat 2 is provided with a buffer protection sleeve 33 that cooperates with the upper locking pin 62.

[0041] Specifically, for the high-precision automotive sheet metal part inspection fixture according to this embodiment, during inspection, after placing the sheet metal part to be measured on the inspection fixture body 1, by rotating the swing arm 3, the swing arm 3 is flipped to the vertical position, and then the push rod 7 is pushed downward. Since the stiffness of the buffer spring 72 is greater than that of the return spring 42, the push rod 7 drives the piston rod 43 and the piston member 4 to move downward together until the piston member 4 moves to the lower dead center. The volume of the oil cavity 41 gradually decreases, and the lubricating oil moves to the upper pump cavity 61 and the lower pump cavity 51, so that the lower locking pin 52 extends out of the first lower bushing 5 and abuts against the second lower bushing 54, and the upper locking pin 62 extends out of the first upper bushing 6 and abuts against the second upper bushing 64, thereby fixing the position of the swing arm 3; in addition, the push rod 7 can be continuously pushed downward. Since the piston member 4 has moved to the lower dead center, continuously pushing the push rod 7 downward causes a relative displacement between the push rod 7 and the piston member 4, gradually adjusting the compression amount of the buffer spring 72 to adjust the oil pressure in the upper pump cavity 61 and the lower pump cavity 51, so as to adjust the abutting force between the first upper conical surface 63 and the second upper conical surface 65, and the abutting force between the first lower conical surface 53 and the second lower conical surface 55.

[0042] When the cam surface block 12 is impacted, the swing arm 3 swings back in the opening direction under the external force. Sliding occurs between the first lower conical surface 53 and the second lower conical surface 55, and between the first upper conical surface 63 and the second upper conical surface 65. The upper locking pin 62 and the lower locking pin 52 are respectively pressed inward, the upper pump chamber 61 and the lower pump chamber 51 are reduced, the piston part 4 presses the buffer spring 72 to move upward, and the volume of the oil chamber 41 increases. After the first lower conical surface 53 is separated from the second lower conical surface 55 and the first upper conical surface 63 is separated from the second upper conical surface 65, the swing arm 3 swings backward. When the swing arm 3 swings back until the upper locking pin 62 is aligned with the hole of the buffer protection sleeve 33, the upper locking pin 62 is inserted into the buffer protection sleeve 33 under the elastic force of the buffer spring 72 to prevent the swing arm 3 from further swinging backward and hitting an external object. The buffer protection sleeve 33 is made of a flexible material and can deform to absorb the external impact force.

[0043] In a high-precision automobile sheet metal part inspection tool according to this embodiment, a fixed plane 8 is provided on one side surface of the top of the push rod 7; an installation hole 81 is provided on the fixed plane 8; a knob shaft 91 is rotatably provided in the installation hole 81; a knob part 92 is connected after the knob shaft 91 protrudes out of the swing arm 3. In a high-precision automobile sheet metal part inspection tool according to this embodiment, a ratchet rack 93 is provided on the swing arm 3 in the height direction; a fixing pin 94 is provided on the circumferential surface of the knob part 92; a fixing boss 82 is provided on the fixed plane 8; a fixing notch 95 for cooperating with the fixing boss 82 is provided on the side surface of the knob shaft 91. In a high-precision automobile sheet metal part inspection tool according to this embodiment, a limiting through hole 32 is provided on the swing arm 3 in the height direction; the knob shaft 91 is movably arranged in the limiting through hole 32.

[0044] Specifically, in the high-precision automobile sheet metal part inspection tool according to this embodiment, when the height of the push rod 7 is adjusted, by rotating the knob part 92, the fixing pin 94 is clamped with the ratchet rack 93, and at the same time, the fixing notch 95 abuts against the fixing boss 82, so that the height of the knob part 92 can be fixed. In addition, by providing the limiting through hole 32, the lifting movement of the knob shaft 91 can be limited.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-precision automotive sheet metal part inspection fixture, characterized in that: It includes a fixture body (1) and a flipping device (11) provided on the fixture body (1); The flipping device (11) includes a flipping base (2), a swing arm (3), and a profiled block (12); the bottom of the swing arm (3) is rotatably provided on the flipping base (2); the profiled block (12) is provided on the top of the swing arm (3); A receiving cavity (31) is provided inside the swing arm (3); a piston member (4) is hermetically and vertically movably provided inside the receiving cavity (31); an oil cavity (41) is formed between the bottom of the piston member (4) and the receiving cavity (31); A first lower shaft sleeve (5) is provided at the bottom of the swing arm (3); a lower pump cavity (51) is provided in the first lower shaft sleeve (5); a lower locking pin (52) is telescopically movably provided in the lower pump cavity (51); a second lower shaft sleeve (54) is provided at the bottom of the flipping base (2); the lower locking pin (52) is provided with a first lower conical surface (53); the second lower shaft sleeve (54) is provided with a second lower conical surface (55) for abutting against the first lower conical surface (53); The swing arm (3) is provided with a first upper shaft sleeve (6) at the top of the first lower shaft sleeve (5); an upper pump cavity (61) is provided in the first upper shaft sleeve (6); an upper locking pin (62) is telescopically movably provided in the upper pump cavity (61); the flipping base (2) is provided with a second upper shaft sleeve (64); the upper locking pin (62) is provided with a first upper conical surface (63); the second upper shaft sleeve (64) is provided with a second upper conical surface (65) for abutting against the first upper conical surface (63); The oil cavity (41), the upper pump cavity (61), and the lower pump cavity (51) are communicated.

2. The high-precision automotive sheet metal part inspection fixture according to claim 1, wherein: The number of the upper locking pins (62) is two; the two upper locking pins (62) are respectively hermetically and movably provided in the first upper shaft sleeve (6); the upper pump cavity (61) is formed between the two upper locking pins (62); the mutually remote ends of the two upper locking pins (62) are both provided with the first upper conical surfaces (63); the second upper shaft sleeves (64) are provided on both sides of the flipping base (2).

3. The high-precision automotive sheet metal part inspection fixture according to claim 1, characterized in that: The number of the lower locking pins (52) is two; the two lower locking pins (52) are respectively hermetically and movably provided in the first lower shaft sleeve (5); the lower pump cavity (51) is formed between the two lower locking pins (52); the mutually remote ends of the two lower locking pins (52) are both provided with the first lower conical surfaces (53); the second lower shaft sleeves (54) are provided on both sides of the flipping base (2).

4. The high-precision automotive sheet metal part inspection fixture according to claim 1, wherein: The first lower shaft sleeve (5) is rotatably connected to the second lower shaft sleeve (54).

5. A high-precision automotive sheet metal part inspection fixture according to claim 1, characterized in that: A return spring (42) is provided between the bottom of the piston member (4) and the bottom of the receiving cavity (31).

6. The high-precision automotive sheet metal part inspection fixture according to claim 5, characterized in that: A piston rod (43) is provided at the top of the piston member (4); a push rod (7) is movably provided at the top of the piston rod (43); a strip-shaped limiting groove (71) is provided in the push rod (7) along the height direction; a limiting pin (44) is provided at the top of the piston rod (43); the limiting pin (44) is movably provided in the strip-shaped limiting groove (71); a buffer spring (72) is provided between the bottom of the push rod (7) and the top of the piston member (4); the stiffness of the buffer spring (72) is greater than the stiffness of the return spring (42).

7. The high-precision automobile sheet metal part inspection fixture according to claim 6, characterized in that: One side surface of the top of the push rod (7) is provided with a fixed plane (8); the fixed plane (8) is provided with a mounting hole (81); a knob shaft (91) is rotatably arranged in the mounting hole (81); a knob part (92) is connected after the knob shaft (91) protrudes out of the swing arm (3).

8. The high-precision automotive sheet metal part inspection fixture according to claim 7, wherein: The swing arm (3) is provided with a ratchet rack (93) along the height direction; a fixing pin (94) is arranged on the circumferential surface of the knob part (92); the fixed plane (8) is provided with a fixed boss (82); a fixing notch (95) matched with the fixed boss (82) is formed in the side surface of the knob shaft (91).

9. The high-precision automotive sheet metal part inspection fixture according to claim 7, wherein: The swing arm (3) is provided with a limiting through hole (32) along the height direction; the knob shaft (91) is movably arranged in the limiting through hole (32).

10. A high-precision automotive sheet metal part inspection fixture according to claim 1, characterized in that: The overturning seat (2) is provided with a buffer protection sleeve (33) matched with the upper locking pin (62).

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