Detection tool telescopic positioning mechanism

Abstract

The utility model discloses a telescopic positioning mechanism for a testing fixture, which comprises a fixed seat and a hollow seat, the hollow seat is supported and fixed through the fixing seat, a sliding rod of a rod-shaped structure is arranged in the hollow seat in a sliding fit mode, a limiting piece is arranged at the tail end of the sliding rod, a spring with an extension trend is arranged between the limiting piece and the hollow seat and externally embedded on the sliding rod, and a hole position perpendicular to the axis of the sliding rod is formed in the upper portion of the hollow seat to form an inserting hole. A three-section type insertion rod is inserted into the insertion hole; a main body of the three-section type inserting rod is a handheld part of a rod-shaped structure, a notch-shaped through hole is formed in the end, away from the handheld part, of the three-section type inserting rod to form a rod penetrating groove hole, the rod penetrating groove hole is externally embedded in the sliding rod, and three sets of parallel stepped planes are arranged on the side, away from the limiting piece, of the rod penetrating groove hole. A convex structure is arranged on the rod section of the sliding rod to form a convex part; positioning heads are arranged on the sides, away from the limiting pieces, of the sliding rods. The device has the beneficial effects that a multi-section telescopic positioning function can be realized without electricity, and the equipment cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of testing fixture positioning, particularly relates to a testing fixture telescopic positioning mechanism. BACKGROUND

[0002] When some workpieces are positioned by testing fixtures, based on the condition that the face where the part positioning hole is located is also the auxiliary reference face according to the drawing, the testing fixture positioning mechanism needs to realize three states.

[0003] First, the positioning pin is inserted into the part positioning hole for positioning, and the flange surface of the positioning pin is in close contact with the part auxiliary reference face.

[0004] Second, the positioning pin is only inserted into the part positioning hole for positioning, without the function of close contact with the reference face.

[0005] Third, retreat to avoid and facilitate the taking and placing of parts; the above use states need to be stable and reliable to ensure accuracy.

[0006] The existing testing fixture positioning equipment (such as the patent file with the publication number CN213875747U) usually needs to rely on electric cylinders, air cylinders or other servo equipment to realize the multi-section telescopic positioning function when realizing the above operation, and the use of the above servo equipment increases the total cost of the testing fixture, so the existing technology needs a testing fixture telescopic positioning mechanism without electric drive. UTILITY MODEL CONTENTS

[0007] The utility model aims to provide a testing fixture telescopic positioning mechanism to solve the technical problem of increasing equipment cost caused by relying on electric control to realize multi-section telescopic positioning function in the above background technology.

[0008] The above technical purpose of the utility model is realized through the following technical scheme:

[0009] The utility model provides a kind of gauge telescopic positioning mechanism, fixed seat, hollow seat;The hollow seat is a hollow block structure, which is supported by the fixed seat, a rod structure is slidably fitted in the hollow seat, a limiting sheet is provided at the end of the slide rod, a spring with elongation tendency is provided between the limiting sheet and the hollow seat and embedded on the slide rod, a hole is formed in the upper part of the hollow seat, perpendicular to the axis of the slide rod, forming a jack, and the jack is loaded with a three-section plug rod;The main body of the three-section plug rod is a bar-shaped hand-held part, a notch-shaped through hole is formed at the end of the three-section plug rod away from the hand-held part, forming a through-hole slot, the through-hole slot is embedded on the slide rod, and three groups of parallel stepped planes are provided on the side of the through-hole slot away from the limiting sheet, from the direction away from the limiting sheet, they are first step surface, second step surface and third step surface, and the first step surface, second step surface and third step surface are connected by inclined surface;An outer convex structure is provided on the rod segment of the slide rod, forming an outer convex part, and the width of the end face of the outer convex part close to the limiting sheet is greater than the width of the through-hole slot;A positioning head is provided on the side of the slide rod away from the limiting sheet.

[0010] Further, in order to make the positioning head have the functions of pin insertion positioning and clamping, the positioning head comprises a positioning pin and an outer convex ring, the positioning pin is a rod structure, one end of the positioning pin close to the slide rod is fixedly connected with the slide rod by an annular or plate-shaped outer convex ring, the outer diameter of the outer convex ring is greater than the outer diameter of the same side end of the slide rod, and the end face of the outer convex ring close to the positioning pin is a flange face.

[0011] Further, in order to improve the sliding smoothness of the slide rod, the slide rod is slidably fitted with the hollow seat through a slide sleeve, and the slide sleeve is embedded and fixed in the hollow seat.

[0012] Further, in order to prevent the slide rod and the positioning head from rotating during work, a common cylindrical hole is provided on the slide sleeve and the hollow seat, a pin is inserted into the cylindrical hole in an interference fit manner to clamp and fix the slide sleeve and the hollow seat, the part of the slide rod and the slide sleeve that are slidably fitted is a sliding part, a rotation-preventing limiting plane is cut at the top of the sliding part, and the inner cross section of the slide sleeve is consistent with the outer cross section of the sliding part.

[0013] Further, in order to improve the switching smoothness between the first step surface, the second step surface, the third step surface and the end face of the outer convex part of the three-section plug rod, the first step surface, the second step surface, the third step surface and the inclined surface connecting them are rounded to form a circular arc transition part.

[0014] Further, in order to further improve the switching smoothness between the first step surface, the second step surface, the third step surface and the end face of the outer convex part of the three-section plug rod, the upper part of the end face of the outer convex part close to the first step surface is rounded to form a rounded part.

[0015] Further, in order to further improve the switching smoothness between the first step surface, the second step surface, the third step surface and the end surface of the outer convex part of the three-section plug rod, the end surface of the outer convex part near the first step surface is provided with at least four groups of wheel grooves, and each group of wheel grooves is rotatably connected with an auxiliary pulley, and the auxiliary pulley is tangent to the first step surface or the second step surface or the third step surface or the inclined surface connecting the first step surface, the second step surface and the third step surface to form a rolling fit.

[0016] Further, in order to improve the angle standardization during the plug-in of the three-section plug rod and improve the extension and retraction accuracy of the slide rod, the hollow seat is provided with a guide sleeve beside the three-section plug rod, the guide sleeve is slidably connected with a guide rail in a strip structure, the guide rail is perpendicular to the axis of the slide rod, and the guide rail is fixed to one of the surfaces of the upper non-third step surface of the three-section plug rod.

[0017] Further, in order to make the outer convex ring have elastic pre-tightening force when clamping the workpiece, the outer convex ring is made of elastic material.

[0018] In summary, the utility model has the following beneficial effects:

[0019] The multi-section extension and positioning function can be realized without electricity, and the equipment cost is reduced: through the establishment of the three-section plug rod, the three-section plug rod is pushed and pulled, the end surface of the outer convex part or the auxiliary pulley thereon is in contact with the second step surface, the third step surface and the first step surface through the inclined surface, and then the three-section extension and retraction operation of pin shaft positioning, clamping and fixing and retreat is realized, without relying on electric control driving, and the equipment cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structure schematic view of the utility model;

[0021] Figure 2 It is the structure schematic view of the three-section plug rod in the utility model;

[0022] Figure 3 It is the partial cut structure schematic view of the utility model;

[0023] Figure 4 It is Figure 3 The structure enlarged view of A in the middle;

[0024] Figure 5 It is the structure schematic view of the slide rod in the utility model;

[0025] Figure 6 It is the structure schematic view of the guide rail in the utility model;

[0026] Figure 7 It is the use structure schematic view of the utility model;

[0027] In the figure, 1, fixed seat; 2, hollow seat; 3, sliding rod; 4, limiting sheet; 5, spring; 6, sliding sleeve; 7, positioning head; 8, three-section plug rod; 9, auxiliary pulley; 10, guide sleeve; 11, guide rail; 13, positioning seat; 14, workpiece; 21, plug hole; 31, main rod; 32, outer convex part; 33, sliding part; 34, round corner part; 35, wheel groove; 61, pin rod; 71, positioning pin; 72, outer convex ring; 73, flange surface; 81, hand holding part; 82, through rod slot hole; 83, first step surface, 84, second step surface; 85, third step surface; 86, circular arc transition part. DETAILED DESCRIPTION

[0028] The utility model will be made further detailed explanation in combination with the drawings.

[0029] Embodiment:

[0030] Please refer to Figures 1-7 The utility model provides technical scheme:

[0031] A gauge telescopic positioning mechanism, fixed seat 1, hollow seat 2;The hollow seat 2 is a hollow block structure, which is supported and fixed by the fixed seat 1, and a rod-shaped structure slidingly fitted in the hollow seat 2 is sliding rod 3, the end of sliding rod 3 is provided with a limiting sheet 4, a spring 5 with elongation tendency is arranged between the limiting sheet 4 and the hollow seat 2 and embedded on the sliding rod 3, a hole perpendicular to the axis of sliding rod 3 is formed in the upper part of the hollow seat 2 to form a plug hole 21, and a three-section plug rod 8 is inserted in the plug hole 21;The main body of the three-section plug rod 8 is a rod-shaped hand holding part 81, a slot-shaped through hole is formed in the end of the three-section plug rod 8 away from the hand holding part 81 to form a through rod slot hole 82, the through rod slot hole 82 is embedded on the sliding rod 3, and three groups of mutually parallel stepped planes are arranged on the side of the through rod slot hole 82 away from the limiting sheet 4, and the first step surface 83, the second step surface 84 and the third step surface 85 are arranged from the direction away from the limiting sheet 4, and the first step surface 83, the second step surface 84 and the third step surface 85 are connected by inclined surfaces;An outer convex structure is arranged on the rod segment of the sliding rod 3 to form an outer convex part 32, and the width of the end face of the outer convex part 32 close to the limiting sheet 4 is greater than the width of the through rod slot hole 82;A positioning head 7 is arranged on the side of the sliding rod 3 away from the limiting sheet 4.

[0032] The positioning head 7 comprises a positioning pin 71 and an outer convex ring 72, the positioning pin 71 is a rod-shaped structure, one end of the positioning pin 71 close to the sliding rod 3 is fixedly connected with the sliding rod 3 by an annular or plate-shaped structure outer convex ring 72, the outer diameter of the outer convex ring 72 is greater than the outer diameter of the same side end of the sliding rod 3, and the end face of the outer convex ring 72 close to the positioning pin 71 is a flange surface 73.

[0033] The sliding rod 3 is slidingly fitted with the hollow seat 2 through a sliding sleeve 6, and the sliding sleeve 6 is embedded and fixed in the hollow seat 2.

[0034] The sliding sleeve 6 and the hollow seat 2 are provided with a common cylindrical opening. A pin 61 is inserted into the cylindrical opening in an interference fit to fix the sliding sleeve 6 and the hollow seat 2. The sliding part 33 is the part that slides between the sliding rod 3 and the sliding sleeve 6. The top of the sliding part 33 is cut with a plane. The inner cross section of the sliding sleeve 6 is the same as the outer cross section of the sliding part 33.

[0035] The first surface 83, the second surface 84, the third surface 85, and the inclined surface connecting them are rounded to form a rounded transition section 86.

[0036] The upper part of the end face of the protruding portion 32 near the first step surface 83 is rounded to form a rounded corner portion 34.

[0037] At least four sets of wheel grooves 35 are provided on both sides of the end face near the first step surface 83 of the protruding part 32. An auxiliary pulley 9 is rotatably fitted in each set of wheel grooves 35. The auxiliary pulley 9 is tangent to the first step surface 83, the second step surface 84, the third step surface 85, or the inclined surface connecting them to form a rolling fit.

[0038] The hollow seat 2 has a guide sleeve 10 on the side of the three-section insertion rod 8. A strip-shaped guide rail 11 is slidably fitted inside the guide sleeve 10. The axis of the guide rail 11 is perpendicular to the axis of the slide rod 3. The guide rail 11 is fixed on one of the surfaces of the three-section insertion rod 8 that are not the third-order surface 85.

[0039] The outer convex ring 72 is made of an elastic material (such as rubber).

[0040] Brief description of usage:

[0041] When using, such as Figure 7 As shown, the workpiece 14 is embedded in the positioning seat 13. This utility model is needed to position and clamp the workpiece 14 in the positioning seat 13 using pins. Because the spring 5 has a tendency to extend, under the action of the spring 5, the slide rod 3, the limiting piece 4, and the positioning head 7 tend to move away from the workpiece 14. This is because the slide rod 3 penetrates the through-hole 82 on the three-section insert rod 8, and because the width of the end face of the protruding part 32 near the limiting piece 4 is greater than the width of the through-hole 82, the three-section insert rod... The two sides of the through-hole 82 on the upper part of the rod limit the path of the slide rod 3 moving away from the workpiece 14. Therefore, the end face of the outer protrusion 32 or the auxiliary pulley 9 on it will be in close contact with the side of the three-section insertion rod 8 that is close to the workpiece 14, namely the first step surface 83, the second step surface 84, and the third step surface 85. When not in use, inserting or removing the three-section insertion rod 8 will make the first step surface 83 on the three-section insertion rod 8 contact the end face of the outer protrusion 32 or the auxiliary pulley 9 on the outer protrusion 32. At this time, the slide rod 3 and the positioning head 7 are farthest from the workpiece 14.

[0042] The utility model uses time is divided into having two purposes:

[0043] Purpose one: only need to carry out pin shaft positioning, need not to clamp positioning.

[0044] At this time, push the three-section plug rod 8 into the hollow seat 2, so that the end face of the outer convex part 32 or the auxiliary pulley 9 thereon enters the second step surface 84 from the first step surface 83 through the inclined surface, and reaches a stable state, because the thickness of the first step surface 83 from the back of the three-section plug rod 8 is less than the thickness of the second step surface 84 from the back of the three-section plug rod 8, so when the end face of the outer convex part 32 or the auxiliary pulley 9 thereon enters the second step surface 84 from the first step surface 83 through the inclined surface, the slide rod 3 and the positioning head 7 thereon will move towards the workpiece 14 side until the positioning pin 71 of the positioning head 7 is inserted into the pin hole of the workpiece 14 and the positioning seat 13 to complete the pin shaft positioning (the positioning of one workpiece 14 can be realized by multiple groups of the utility model working at the same time, Figure 7 The workpiece 14 shown is only a reference, and the shape of the workpiece 14 is not limited.

[0045] Purpose two: while performing pin shaft positioning, the flange surface 73 also needs to be used to clamp and fix the workpiece 14.

[0046] At this time, push the three-section plug rod 8 into the hollow seat 2, so that the end face of the outer convex part 32 or the auxiliary pulley 9 thereon enters the third step surface 85 from the second step surface 84 through the inclined surface, and reaches a stable state, because the thickness of the second step surface 84 from the back of the three-section plug rod 8 is less than the thickness of the third step surface 85 from the back of the three-section plug rod 8, so when the end face of the outer convex part 32 or the auxiliary pulley 9 thereon enters the third step surface 85 from the second step surface 84 through the inclined surface, the slide rod 3 and the positioning head 7 thereon will move towards the workpiece 14 side, the positioning pin 71 inserted into the workpiece 14 will continue to move, until the flange surface 73 on the positioning head 7 is pressed around the pin hole of the workpiece 14, and then the workpiece 14 is pressed in the positioning seat 13.

[0047] Through the fixation of the above two ways, the workpiece 14 in the positioning seat 13 can be inspected, after the inspection is completed, pull out the three-section plug rod 8 upwards until the end face of the outer convex part 32 or the auxiliary pulley 9 thereon enters the first step surface 83 through the inclined surface, and the slide rod 3 completes the retraction movement, the slide rod 3 and the positioning head 7 complete the reset, the positioning pin 71 of the positioning head 7 is completely separated from the pin hole of the workpiece 14 and the positioning seat 13, and the retreat is realized, so that the workpiece 14 can be taken and placed.

[0048] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model. A person skilled in the art can make modifications to the embodiment without creative contribution according to needs after reading the specification, but as long as the modifications are within the scope of the claims of the utility model, the modifications are protected by the Patent Law.

Claims

1. A telescopic positioning mechanism of a testing tool, a fixed seat (1), a hollow seat (2); characterized in that: The hollow seat (2) is a hollow block structure supported by the fixed seat (1), a sliding rod (3) of a rod structure is slidingly fitted in the hollow seat (2), the sliding rod (3) is provided with a limiting sheet (4) at the end thereof, a spring (5) with an elongation tendency is externally embedded on the sliding rod (3) between the limiting sheet (4) and the hollow seat (2), a hole (21) perpendicular to the axis of the sliding rod (3) is formed in the upper part of the hollow seat (2) to form a jack (21), and a three-section plug rod (8) is inserted in the jack (21); the main body of the three-section plug rod (8) is a hand-held part (81) of a rod structure, a slot-shaped through hole is formed in the end of the three-section plug rod (8) away from the hand-held part (81) to form a rod slot (82), the rod slot (82) is externally embedded on the sliding rod (3), three groups of parallel stepped planes are arranged on the side of the rod slot (82) away from the limiting sheet (4), the planes are a first step plane (83), a second step plane (84) and a third step plane (85) from the direction away from the limiting sheet (4), and the first step plane (83), the second step plane (84) and the third step plane (85) are connected by inclined planes; an external convex structure is arranged on the rod segment of the sliding rod (3) to form an external convex part (32), the width of the end face of the external convex part (32) close to the limiting sheet (4) is greater than the width of the rod slot (82), and a positioning head (7) is arranged on the side of the sliding rod (3) away from the limiting sheet (4).

2. A telescopic positioning mechanism for a testing fixture according to claim 1, wherein: The positioning head (7) comprises a positioning pin (71) and an external convex ring (72), the positioning pin (71) is a rod structure, one end of the positioning pin (71) close to the sliding rod (3) is fixedly connected with the sliding rod (3) by an external convex ring (72) of a ring or plate structure, the outer diameter of the external convex ring (72) is greater than the outer diameter of the same side end of the sliding rod (3), and the end face of the external convex ring (72) close to the positioning pin (71) is a flange face (73).

3. A telescoping positioning mechanism for a testing fixture according to claim 1, wherein: The sliding rod (3) is slidingly fitted with the hollow seat (2) through a sliding sleeve (6), and the sliding sleeve (6) is embedded and fixed in the hollow seat (2).

4. A telescopic positioning mechanism for a testing fixture according to claim 3, wherein: A common cylindrical opening is arranged on the sliding sleeve (6) and the hollow seat (2), a pin rod (61) is inserted in the cylindrical opening in an interference fit manner to clamp and fix the sliding sleeve (6) and the hollow seat (2), the sliding part (33) of the sliding rod (3) and the sliding sleeve (6) is slidingly fitted, the top of the sliding part (33) is cut to form an anti-rotation limiting plane, and the inner cross section of the sliding sleeve (6) is consistent with the outer cross section of the sliding part (33).

5. A telescoping positioning mechanism for a testing fixture according to claim 1, wherein: The first step plane (83), the second step plane (84), the third step plane (85) and the inclined planes connecting them are chamfered to form a circular arc transition part (86).

6. A telescopic positioning mechanism for a testing fixture according to claim 5, wherein: The upper part of the end face of the external convex part (32) close to the first step plane (83) is chamfered to form a chamfered part (34).

7. A telescoping positioning mechanism for a testing fixture according to claim 5, wherein: At least four groups of wheel grooves (35) are arranged on both sides of the end face of the external convex part (32) close to the first step plane (83), an auxiliary pulley (9) is rotatably fitted in each group of wheel grooves (35), and the auxiliary pulley (9) is tangent to the first step plane (83), the second step plane (84), the third step plane (85) or the inclined planes connecting them to form rolling fit.

8. A telescoping positioning mechanism for a testing fixture according to claim 1, wherein: The hollow seat (2) is provided with a guide sleeve (10) beside the three-section inserting rod (8), the guide sleeve (10) is slidably fitted with a strip-shaped guide rail (11), the guide rail (11) is perpendicular to the axis line of the slide rod (3); the guide rail (11) is fixed on one of the faces of the upper non-third step face (85) of the three-section inserting rod (8).

9. A telescoping positioning mechanism for a testing fixture according to claim 2, wherein: The outer convex ring (72) is made of elastic material.

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