CN112414257B - Crankshaft blank center hole runout testing fixture - Google Patents
Crankshaft blank center hole runout testing fixture Download PDFInfo
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- CN112414257B CN112414257B CN202110048333.1A CN202110048333A CN112414257B CN 112414257 B CN112414257 B CN 112414257B CN 202110048333 A CN202110048333 A CN 202110048333A CN 112414257 B CN112414257 B CN 112414257B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
Abstract
The invention belongs to the field of crankshaft production detection, and particularly relates to a crankshaft blank center hole run-out detection tool which comprises a dial indicator, a reference seat, a measurement swing arm and a connecting frame, wherein the reference seat comprises a seat body, a positioning head and a first elastic part, the positioning head comprises a guide rod and a spherical top head, and the positioning head can only move left and right; the distances from the hard alloy measuring head of the measuring swing arm and the contact point of the gauge rod to the rotating shaft are equal; the bottom of the connecting frame is fixedly connected with the base body, the measuring swing arm is rotatably arranged at the upper part of the connecting frame through a rotating shaft of the measuring swing arm, and the measuring swing arm has a tendency of anticlockwise rotation under the action of the second elastic piece; the dial indicator is arranged in the middle of the connecting frame, and the head of the gauge rod is abutted to a gauge rod contact of the vertical swing rod leftwards, so that the gauge is simple to operate, quick to check, and favorable for realizing 100% detection, has low requirement on the placing position of a workpiece to be measured, is more flexible to measure the workpiece, and reduces the labor intensity of workers.
Description
Technical Field
The invention belongs to the field of crankshaft production detection, and particularly relates to a crankshaft blank center hole runout detection tool.
Background
The crankshaft product has high precision on the center hole of the blank, and once the center hole has large runout, the machining allowance is uneven and difficult, and the crankshaft product is scrapped due to insufficient machining allowance in severe cases; meanwhile, the center hole is abnormal in jumping, and dynamic balance cannot be scrapped after machining. In order to ensure that the runout of the central hole of the crankshaft blank is within the technical requirement range, the runout condition of the central hole needs to be checked. The traditional central hole jumping detection mode is that a crankshaft blank after a central hole is machined is placed on a deflection instrument to be matched with a dial indicator for detection, the deflection instrument is long in inspection cost, one measurement needs 5 minutes, the detection efficiency is low, all products can only be subjected to sampling measurement to ensure the work efficiency, and 100% detection cannot be achieved.
Disclosure of Invention
The invention aims to provide a crankshaft blank center hole runout checking fixture which is convenient to operate and rapid to detect.
The technical scheme for implementing the purpose is as follows:
a crankshaft blank center hole run-out gauge comprises a dial indicator, a reference seat, a measuring swing arm and a connecting frame,
the reference seat comprises a seat body, a positioning head and a first elastic part, wherein a cavity is arranged in the seat body, a vertical positioning plane is arranged on the left side outside the seat body, a through hole communicated with the cavity is formed in the middle of the positioning plane, the positioning head comprises a guide rod and a spherical top, the guide rod is horizontally arranged, the spherical top is fixedly connected to the center of the left end face of the guide rod, the first elastic part is arranged in the cavity of the seat body, the left end of the guide rod is connected with the elastic part, and the guide rod of the positioning head is arranged in the through hole and is constrained by the inner wall of the through hole so that the positioning head can only move left and right;
the measuring swing arm comprises a transverse swing rod, a vertical swing rod and a rotating shaft, a hard alloy measuring head is arranged at the bottom of the left end of the transverse swing rod downwards, a gauge rod contact is arranged on the right side of the lower end of the vertical swing rod, the right end of the transverse swing rod is fixedly connected with the upper end of the vertical swing rod, the rotating shaft is arranged at the joint of the transverse swing rod and the vertical swing rod and is vertical to the transverse swing rod and the vertical swing rod, and the distances from the hard alloy measuring head and the gauge rod contact to the rotating shaft are equal;
the bottom of the connecting frame is fixedly connected with the base body, the measuring swing arm is rotatably arranged at the upper part of the connecting frame through a rotating shaft of the measuring swing arm, a second elastic piece is arranged between the measuring swing arm and the connecting frame, and the measuring swing arm has a tendency of anticlockwise rotation under the action of the second elastic piece; the dial indicator is arranged in the middle of the connecting frame, and the head of the gauge rod is leftwards abutted to a gauge rod contact of the vertical swing rod;
during measurement, the positioning plane of the base body is tightly attached to the end face of the crankshaft, the spherical top head tightly abuts against the conical surface of the central hole of the crankshaft blank leftwards under the action of the first elastic piece, and the hard alloy measuring head tightly abuts against the outer circular surface of the end of the crankshaft under the action of the second elastic piece.
Furthermore, the first elastic part is a first compression spring, the first compression spring is horizontally arranged in the cavity of the seat body, and the left end and the right end of the first compression spring are respectively connected with the guide rod and the inner wall of the cavity.
Further, the second elastic piece is a torsion spring, and the torsion spring is installed on the rotating shaft.
Preferably, the second elastic member is a tension spring, and the left end and the right end of the tension spring are respectively connected with the vertical swing rod and the connecting frame.
Preferably, the second elastic member is a second compression spring, the vertical swing rod extends upward to form a protrusion, and the left end and the right end of the second compression spring are respectively connected with the protrusion and the connecting frame.
Further, the dial indicator is horizontally arranged in the middle of the connecting frame.
Further, the vertical swing rod and the transverse swing rod are perpendicular to each other.
When the detection tool is used for detecting the runout of the central hole of the crankshaft blank, the crankshaft blank is kept still, the spherical top head tightly abuts against the conical surface of the central hole of the crankshaft blank leftwards, the positioning plane of the base body is ensured to be tightly attached to the end face of the crankshaft, and the hard alloy measuring head of the transverse swing rod tightly abuts against the surface of the excircle of the end of the crankshaft. The checking fixture rotates for a circle by taking the guide rod as a shaft, so that the positioning plane of the base body is always tightly attached to the end face of the crankshaft, the maximum value and the minimum value of the reading are read on the dial indicator, and the difference value between the maximum value and the minimum value is the central hole runout value of the workpiece.
The invention has the following beneficial effects:
1. the method can quickly and simply measure the jump of the central hole of the crankshaft blank, is simple to operate, is beneficial to realizing 100 percent of detection, prevents unqualified products from flowing to customers to cause processing waste products to cause customer complaints, greatly reduces the detection time, improves the detection efficiency, and can effectively reduce the labor intensity of measuring personnel;
2. the checking fixture has the advantages that the radial direction is small, the requirement on the position of a workpiece to be measured is low, the workpiece is measured more flexibly, the workpiece can be placed on a material rack, a material frame and even a machine tool to be measured conveniently, and the workpiece carrying, assembling and disassembling caused by checking the jumping value of the central hole of the crankshaft blank can be effectively reduced.
It should be noted that, based on the above technical solution, those skilled in the art should know that, in the present application, a central hole run-out value is obtained indirectly by measuring a vertical arm swing value, and the accuracy of the central hole run-out value is related to the angles between the dial indicator lever and the vertical swing link, and it is obvious that when the dial indicator lever is perpendicular to the vertical swing arm, the amplitude of the horizontal swing of the vertical swing arm (the amplitude is also small because the run-out value is usually small) is highly consistent with the reading of the dial indicator. It should be further understood that the left, right, upper and lower parts of the present disclosure are referred to by the relative positions for easy description of the related structures, and are not intended to limit the present disclosure, and those skilled in the art can substitute equivalent technologies if they use symmetric transformation to obtain the same functions according to the technical solutions described in the present disclosure, without departing from the scope of the present disclosure.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic view illustrating a usage status of the first embodiment;
FIG. 3 is a schematic structural diagram according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of the present invention.
In the figure, a double arrow indicates the rotation direction of the gauge during measurement; 1. a dial indicator; 1-1, a club head; 2. a reference base; 2-1, a seat body; 2-1-1. cavity; 2-1-2, positioning a plane; 2-2, positioning the head; 2-2-1, a guide rod; 2-2-2. a spherical plug; 2-3. a first compression spring; 3. measuring a swing arm; 3-1, transversely swinging the rod; 3-2, a vertical swing rod; 3-3. a rotating shaft; 4. a connecting frame; 5. a second elastic member; 6. and (4) crankshaft blank.
Detailed Description
The present invention will be described in detail with reference to the following examples, which are not intended to limit the technical scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, the crankshaft blank center hole run-out checking fixture comprises a dial indicator 1, a reference base 2, a measuring swing arm 3 and a connecting frame 4,
the reference seat comprises a seat body 2-1, a positioning head 2-2 and a first compression spring 2-3, wherein a cavity 2-1-1 is arranged inside the seat body, a vertical positioning plane 2-1-2 is arranged on the left side outside the seat body, a through hole communicated with the cavity 2-1-1 is arranged in the middle of the positioning plane 2-1-2, the positioning head 2-2 comprises a guide rod 2-2-1 and a spherical top head 2-2-2, the guide rod 2-2-1 is horizontally arranged, the spherical top head 2-2-2 is fixedly connected to the center of the left end face of the guide rod 2-2-1, in the embodiment, the first compression spring 2-3 is horizontally arranged in the cavity 2-1-1 of the seat body, the left end and the right end of the first compression spring 2-3 are respectively connected with the right end face of the guide rod 2-2-1 and the inner wall of the cavity, a guide rod 2-2-1 of the positioning head is arranged in the through hole and is restricted by the inner wall of the through hole, so that the positioning head 2-2 can only move left and right;
the measuring swing arm 3 comprises a transverse swing rod 3-1, a vertical swing rod 3-2 and a rotating shaft 3-3, a hard alloy measuring head 3-1-1 is arranged at the bottom of the left end of the transverse swing rod 3-1 downwards, a gauge rod contact is arranged on the right side of the lower end of the vertical swing rod 3-2, the transverse swing rod 3-2 and the vertical swing rod 3-2 are mutually vertical, the right end of the transverse swing rod 3-1 is fixedly connected with the upper end of the vertical swing rod 3-2, the rotating shaft 3-3 is arranged at the joint of the transverse swing rod 3-2 and the vertical swing rod 3-2 and is vertical to the transverse swing rod 3-2, and the distances from the hard alloy measuring head 3-1-1 and the gauge rod contact to the rotating shaft 3-3 are equal; in the embodiment, the upper end of the vertical swing rod 3-2 extends upwards to be provided with a protruding part 3-2-1,
the bottom of the connecting frame 4 is fixedly connected with a base body, the measuring swing arm 3 is rotatably arranged at the upper part of the connecting frame 4 through a rotating shaft 3-3 of the measuring swing arm, a second elastic piece 5 is arranged between the protruding part 3-2-1 at the upper part of the vertical swing rod 3-2 and the connecting frame 4, the second elastic piece 5 is a second compression spring, the left end and the right end of the second compression spring are respectively connected with the protruding part 3-2-1 and the connecting frame 4, and the measuring swing arm 3 has the tendency of anticlockwise rotation under the stretching action of the second compression spring; the dial indicator 1 is horizontally arranged in the middle of the connecting frame 4, and the head 1-1 of the indicator rod is leftwards abutted against an indicator rod contact of the vertical swing rod 3-2.
During measurement, referring to fig. 2, when the detection tool is used for detecting the runout of the central hole of the crankshaft blank 6, the crankshaft blank 6 is kept still, under the stretching action of the first compression spring 2-3, the spherical top 2-2-2 tightly abuts against the conical surface of the central hole of the crankshaft blank 6 leftwards, the positioning plane 2-1-2 of the seat body is ensured to be tightly attached to the end face of the crankshaft blank 6, and the hard alloy measuring head 3-1-1 (under the stretching action of the second compression spring) of the transverse swing rod tightly abuts against the outer circle surface of the end of the crankshaft blank 6. And ensuring that the positioning plane 2-1-2 of the seat body is always tightly attached to the end surface of the crankshaft blank 6, rotating the checking fixture for one circle by taking the guide rod 2-2-1 as a shaft, taking the maximum value and the minimum value read by the dial indicator, and taking the difference value between the maximum value and the minimum value as the runout value of the central hole of the crankshaft blank 6.
The detection tool is simple to operate in the measurement process, and has no strict requirement on the posture of the crankshaft blank 6, so that the measurement is quick and efficient, all crankshaft blank products can be completely detected, and the outgoing quality of the products is ensured.
Example two:
referring to fig. 3, the difference of this embodiment from the first embodiment is that a protrusion on the upper portion of the vertical swing link is eliminated, the second elastic member 5 is a tension spring, the tension spring is installed on the lower portion of the vertical swing link, the left and right ends of the tension spring are respectively connected to the vertical swing link 3-2 and the connecting frame 4, the tension of the tension spring causes the measurement swing arm 3 to have a tendency of rotating counterclockwise, and other structures and using methods are the same as those of the first embodiment.
Example three:
referring to fig. 4, the embodiment is different from the second embodiment in that the second elastic member 5 is a torsion spring, the torsion spring is mounted on the rotating shaft 3-3, the restoring force of the torsion spring makes the measuring swing arm 3 generate a counterclockwise rotation tendency, and other structures and using methods are the same as those of the first embodiment.
Claims (7)
1. A crankshaft blank center hole run-out checking fixture comprises a dial indicator and is characterized by further comprising a reference base, a measuring swing arm and a connecting frame,
the reference seat comprises a seat body, a positioning head and a first elastic part, wherein a cavity is arranged in the seat body, a vertical positioning plane is arranged on the left side outside the seat body, a through hole communicated with the cavity is formed in the middle of the positioning plane, the positioning head comprises a guide rod and a spherical top, the guide rod is horizontally arranged, the spherical top is fixedly connected to the center of the left end face of the guide rod, the first elastic part is connected with the guide rod and the inner wall of the cavity and is arranged in the cavity of the seat body, and the guide rod of the positioning head is arranged in the through hole and is restricted by the inner wall of the through hole so that the positioning head can only move left and right;
the measuring swing arm comprises a transverse swing rod, a vertical swing rod and a rotating shaft, a hard alloy measuring head is arranged at the bottom of the left end of the transverse swing rod downwards, a gauge rod contact is arranged on the right side of the lower end of the vertical swing rod, the right end of the transverse swing rod is fixedly connected with the upper end of the vertical swing rod, the rotating shaft is arranged at the joint of the transverse swing rod and the vertical swing rod and is vertical to the transverse swing rod and the vertical swing rod, and the distances from the hard alloy measuring head and the gauge rod contact to the rotating shaft are equal;
the bottom of the connecting frame is fixedly connected with the base body, the measuring swing arm is rotatably arranged at the upper part of the connecting frame through a rotating shaft of the measuring swing arm, a second elastic piece is arranged between the measuring swing arm and the connecting frame, and the measuring swing arm has a tendency of anticlockwise rotation under the action of the second elastic piece; the dial indicator is arranged in the middle of the connecting frame, and the head of the gauge rod is leftwards abutted to a gauge rod contact of the vertical swing rod;
during measurement, the positioning plane of the base body is tightly attached to the end face of the crankshaft, the spherical top head tightly abuts into the conical surface of the central hole of the crankshaft blank leftwards under the action of the first elastic piece, and the hard alloy measuring head tightly abuts against the outer circle surface of the end head of the crankshaft under the action of the second elastic piece.
2. The crankshaft blank central hole run-out gauge as claimed in claim 1, wherein the first elastic member is a first compression spring, the first compression spring is horizontally installed in the cavity of the seat body, and left and right ends of the first compression spring are respectively connected with the guide rod and the inner wall of the cavity.
3. The crankshaft blank central hole runout testing fixture according to claim 1, wherein the second elastic member is a torsion spring, and the torsion spring is mounted on the rotating shaft.
4. The crankshaft blank central hole run-out testing fixture of claim 1, wherein the second elastic member is a tension spring, and the left end and the right end of the tension spring are respectively connected with the vertical swing rod and the connecting frame.
5. The crankshaft blank central hole run-out gauge as claimed in claim 1, wherein the second elastic member is a second compression spring, the vertical swing rod extends upwards to form a protrusion, and the left end and the right end of the second compression spring are respectively connected with the protrusion and the connecting frame.
6. The crankshaft blank central hole runout testing fixture according to claim 1, wherein the dial indicator is horizontally arranged in the middle of the connecting frame.
7. The crankshaft blank central hole runout testing fixture according to any one of claims 1 to 6, wherein the vertical swing link and the transverse swing link are perpendicular to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048333.1A CN112414257B (en) | 2021-01-14 | 2021-01-14 | Crankshaft blank center hole runout testing fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048333.1A CN112414257B (en) | 2021-01-14 | 2021-01-14 | Crankshaft blank center hole runout testing fixture |
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| CN112414257A CN112414257A (en) | 2021-02-26 |
| CN112414257B true CN112414257B (en) | 2022-05-06 |
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| CN112414257A (en) | 2021-02-26 |
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