CN104132607A - Welding deformation detection platform for agricultural machinery chassis frame - Google Patents
Welding deformation detection platform for agricultural machinery chassis frame Download PDFInfo
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- CN104132607A CN104132607A CN201410309622.2A CN201410309622A CN104132607A CN 104132607 A CN104132607 A CN 104132607A CN 201410309622 A CN201410309622 A CN 201410309622A CN 104132607 A CN104132607 A CN 104132607A
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Abstract
本发明涉及一种车架焊接变形检测平台，尤其涉及一种农业机械底盘车架焊接变形检测平台。本发明的目的在于提供一种成本低、工作效率高、操作简便、能够测定农业机械底盘车架焊接变形位置和变形量的农业机械底盘车架焊接变形检测平台，其测量结果精确且直观形象，能够实现车架焊接变形的精确校正。本发明能够实现百分表在横、纵、竖三个方向测量车架的焊接变形量，通过数据线将数显百分表的测量结果实时传入计算机，可以直观的看到车架不同位置的变形量，从而确定校正位置和校正量，减少了工人的工作量，提高了车架焊接变形校正的准确性；造价成本低，操作方便，提高了工作效率，满足企业需要。
The invention relates to a vehicle frame welding deformation detection platform, in particular to an agricultural machinery chassis welding deformation detection platform. The purpose of the present invention is to provide an agricultural machinery chassis frame welding deformation detection platform with low cost, high work efficiency, easy operation, and the ability to measure the welding deformation position and deformation amount of the agricultural machinery chassis frame. The measurement results are accurate and intuitive. Accurate correction of frame welding deformation can be realized. The invention can realize the dial indicator to measure the welding deformation of the vehicle frame in three directions: horizontal, vertical and vertical, and transmit the measurement results of the digital display dial indicator to the computer in real time through the data line, so that different positions of the vehicle frame can be visually seen The deformation amount can be determined to determine the correction position and correction amount, which reduces the workload of workers and improves the accuracy of frame welding deformation correction; the cost is low, the operation is convenient, and the work efficiency is improved to meet the needs of enterprises.
Description
Technical field
The present invention relates to a kind of Frame Welding deformation detection platform, relate in particular to a kind of agricultural machinery chassis frame welding deformation detection platform.
Background technology
Mostly agricultural machinery chassis frame deformation detection is artificial visual inspection at present, or detects vehicle frame welding deformation position and welding deformation amount by bracing wire, tape measure, angle square etc., and detection error is large, precision is low, and workload is large, inefficiency.Rare employing Three-Coordinate Measuring Arm detects agricultural machinery chassis frame welding deformation, and measurement result is not directly perceived, and cost is high, cannot use on a large scale.
Summary of the invention
For above problem, the object of the present invention is to provide that a kind of cost is low, work efficiency is high, easy and simple to handle, the agricultural machinery chassis frame welding deformation detection platform that can measure agricultural machinery chassis frame welding deformation position and deflection, its measurement result accurately and visual pattern, can realize the accurate correction of Frame Welding distortion.
In order to achieve the above object, the invention provides following technical scheme:
An agricultural machinery chassis frame welding deformation detection platform, it comprises mechanical part; Described mechanical part comprises base mechanism, Three Degree Of Freedom feed mechanism and dial gauge installing mechanism, wherein,
In described base mechanism:
Base plate 6 is threadedly connected on base 7, and adjustable frames 20 is threaded in base 7 times, and located lateral piece 24 and longitudinal register piece 23 are threadedly connected on base plate 6;
In described Three Degree Of Freedom feed mechanism:
Longitudinally stepper motor 22 is connected with the leading screw of length feed worktable 3 by shaft coupling; The leading screw of the leading screw of length feed worktable 3 and length feed guide rail 13 is connected with synchronizing belt gear by key respectively; Longitudinally synchronous cog belt 21 one end are placed on the synchronizing belt gear of leading screw of length feed worktable 3, and the other end is placed on the synchronizing belt gear of leading screw of length feed guide rail 13; First longitudinal motion block 401 and second longitudinal motion block 402 all have respectively threaded hole and through hole; The screw set of length feed worktable 3 is in the threaded hole of first longitudinal motion block 401, and the screw set of length feed guide rail 13 is in the threaded hole of second longitudinal motion block 402; The leader casing of length feed worktable 3 is in the through hole of first longitudinal motion block 401, and the leader casing of length feed guide rail 13 is in the through hole of second longitudinal motion block 402; Length feed worktable 3 and length feed guide rail 13 are threaded connection on base plate 6;
Vertical stepper motor 16 is connected with the leading screw of vertical Feed table 14 by shaft coupling; The leading screw of the leading screw of vertical Feed table 14 and vertical feeding guide rail 1 is connected with synchronizing belt gear by key respectively; Vertical synchronous cog belt 12 one end are placed on the synchronizing belt gear of leading screw of vertical Feed table 14, and the other end is placed on the synchronizing belt gear of leading screw of vertical feeding guide rail 1; The first vertical motion block 201 and the second vertical motion block 202 all have respectively threaded hole and through hole; The screw set of vertical Feed table 14 is in the threaded hole of the first vertical motion block 201, and the screw set of vertical feeding guide rail 1 is in the threaded hole of the second vertical motion block 202; The leader casing of vertical Feed table 14 is in the through hole of the first vertical motion block 201, and the leader casing of vertical feeding guide rail 1 is in the through hole of the second vertical motion block 202; Vertical Feed table 14 is threadedly connected on second longitudinal motion block 402, and vertical feeding guide rail 1 is threadedly connected on first longitudinal motion block 401;
Horizontal stepper motor 19 is connected with the leading screw of traverse feed worktable 5 by shaft coupling; Traverse feed worktable 5 is threaded connection on the first vertical motion block 201 and the second vertical motion block 202; Laterally motion block 9 has threaded hole and through hole; The screw set of traverse feed worktable 5 is in the threaded hole of horizontal motion block 9; The leader casing of traverse feed worktable 5 is in the through hole of horizontal motion block 9;
In described dial gauge installing mechanism:
Digital display centimeter mount pad 10 is adsorbed on horizontal motion block 9, and digital display centimeter 11 is fixedly installed on dial gauge mount pad 10.
In described Three Degree Of Freedom feed mechanism, also comprise approach switch 17, described approach switch 17 is threadedly connected on approach switch mount pad 18, and approach switch mount pad 18 is threaded with traverse feed worktable 5, length feed worktable 3 and vertical Feed table 14 respectively.
Described agricultural machinery chassis frame welding deformation detection platform also comprises control section,
In described control section, computing machine 26 is connected with PLC27 by data line 25, PLC27 is by instruction control step motor driver 29, stepper motor driver 29 is controlled horizontal stepper motor 19, longitudinal stepper motor 22 and vertical stepper motor 16, and the measurement result of digital display centimeter 11 is imported computing machine 26 into by data line 25; Wherein, described PLC27 and stepper motor driver 29 are contained in to be controlled in terminal box, by switch 28, is controlled.
Described switch 28 comprises remote control gauge tap and hand push button switch.
Compared with prior art, beneficial effect of the present invention is:
The present invention can realize dial gauge at welding deformation amounts horizontal, vertical, perpendicular three orientation measurement vehicle frames, by data line, import in real time the measurement result of digital display centimeter into computing machine, can see intuitively the deflection of vehicle frame diverse location, thereby determine correction position and correcting value, reduce workman's workload, improved the accuracy that Frame Welding distortion is proofreaied and correct; Cost is low, easy to operate, improved work efficiency, meets enterprise's needs.
Accompanying drawing explanation
Fig. 1 is the structural front view of agricultural machinery chassis frame welding deformation detection platform of the present invention;
Fig. 2 is the structure vertical view of agricultural machinery chassis frame welding deformation detection platform of the present invention;
Fig. 3 is the partial enlarged drawing of Fig. 2 of the present invention;
Fig. 4 is control system schematic diagram of the present invention.
[primary clustering symbol description]
1 vertical feeding guide rail
The vertical motion block of 201 first vertical motion block 202 second
3 length feed worktable
The longitudinal motion block of 401 first longitudinal motion block 402 second
5 traverse feed worktable 6 base plates
7 base 8 vehicle frames
9 horizontal motion block 10 digital display centimeter mount pads
The vertical synchronous cog belt of 11 digital display centimeter 12
The vertical Feed table of 13 length feed guide rail 14
16 vertical stepper motor 17 approach switchs
18 approach switch mount pad 19 horizontal stepper motors
The longitudinal synchronous cog belt of 20 adjustable frames 21
22 longitudinal stepper motor 23 longitudinal register pieces
24 located lateral piece 25 data lines
26 computing machine 27 PLC
28 switch 29 stepper motor drivers
Embodiment
Below, by reference to the accompanying drawings with embodiment, explain in further detail the present invention.
As depicted in figs. 1 and 2, be respectively structural front view and the vertical view of agricultural machinery chassis frame welding deformation detection platform of the present invention, wherein, X, Y, tri-directions of Z represent respectively laterally, longitudinal, vertical direction (vertically); Fig. 3 is the partial enlarged drawing of Fig. 2 of the present invention, and Fig. 4 is control system schematic diagram of the present invention.
Wherein, described agricultural machinery chassis frame welding deformation detection platform comprises mechanical part and control section.Wherein, described mechanical part comprises base mechanism, Three Degree Of Freedom feed mechanism and dial gauge installing mechanism.
In described base mechanism, base 7 is welded by channel-section steel, and base plate 6 is secured by bolts on base 7, and adjustable frames 20 is threaded in base 7 times, and located lateral piece 24 and longitudinal register piece 23 are bolted in the top of base plate 6.
In described Three Degree Of Freedom feed mechanism, longitudinally stepper motor 22 is connected with the leading screw of length feed worktable 3 by shaft coupling, and longitudinally stepper motor 22 rotates, and drives the leading screw of length feed worktable 3 to rotate.The leading screw of the leading screw of length feed worktable 3 and length feed guide rail 13 has synchronizing belt gear by spline joint respectively, longitudinally synchronous cog belt 21 one end are placed on the synchronizing belt gear of leading screw of length feed worktable 3, the other end is placed on the synchronizing belt gear of leading screw of length feed guide rail 13, realizes the transmission of the leading screw of length feed worktable 3 and the leading screw of length feed guide rail 13.First longitudinal motion block 401 and second longitudinal motion block 402 have respectively a threaded hole and two through holes.The screw set of length feed worktable 3 is in the threaded hole of first longitudinal motion block 401, and the screw set of length feed guide rail 13 is in the threaded hole of second longitudinal motion block 402, and realization is threaded.The leading screw of length feed worktable 3 rotates, and by longitudinal synchronous cog belt 21, drives the leading screw of length feed guide rail 13 to rotate, and jointly drives first longitudinal motion block 401 and second longitudinal motion block 402 upper mobile in longitudinal (Y-direction).The leader casing of length feed worktable 3 is in the through hole of first longitudinal motion block 401, and the leader casing of length feed guide rail 13, in the through hole of second longitudinal motion block 402, plays guide effect.Length feed worktable 3 and length feed guide rail 13 are bolted to connection on base plate 6.
Vertical stepper motor 16 is connected with the leading screw of vertical Feed table 14 by shaft coupling, and vertical stepper motor 16 rotates, and drives the leading screw of vertical Feed table 14 to rotate.The leading screw of the leading screw of vertical Feed table 14 and vertical feeding guide rail 1 has synchronizing belt gear by spline joint respectively, vertical synchronous cog belt 12 one end are placed on the synchronizing belt gear of leading screw of vertical Feed table 14, the other end is placed on the synchronizing belt gear of leading screw of vertical feeding guide rail 1, realizes the transmission between the leading screw of vertical Feed table 14 and the leading screw of vertical feeding guide rail 1.The first vertical motion block 201 and the second vertical motion block 202 all have respectively a threaded hole, two through holes.The screw set of vertical Feed table 14 is in the threaded hole of the first vertical motion block 201, and the screw set of vertical feeding guide rail 1 is in the threaded hole of the second vertical motion block 202, and realization is threaded.The leading screw of vertical Feed table 14 rotates, and by vertical synchronous cog belt 12, drives the leading screw of vertical feeding guide rail 1 to rotate, and jointly drives the first vertical motion block 201 and the second vertical motion block 202 in the vertical directions (Z direction) mobile.The leader casing of vertical Feed table 14 is in the through hole of the first vertical motion block 201, and the leader casing of vertical feeding guide rail 1, in the through hole of the second vertical motion block 202, plays guide effect.Vertical Feed table 14 bolts are fixedly connected on second longitudinal motion block 402, and vertical feeding guide rail 1 bolt is fixedly connected on first longitudinal motion block 401.
Horizontal stepper motor 19 is connected with the leading screw of traverse feed worktable 5 by shaft coupling.Horizontal stepper motor 19 rotates, and drives the leading screw of traverse feed worktable 5 to rotate.Traverse feed worktable 5 is bolted to connection on the first vertical motion block 201 and the second vertical motion block 202.Laterally motion block 9 has a threaded hole, two through holes.The screw set of traverse feed worktable 5 is in the threaded hole of horizontal motion block 9, and realization is threaded.The leading screw of traverse feed worktable 5 rotates, and drives horizontal motion block 9 transverse shiftings (directions X).The leader casing of traverse feed worktable 5, in the through hole of horizontal motion block 9, play the guiding role.
Approach switch 17 is threadedly connected on approach switch mount pad 18, and approach switch mount pad 18 is connected with traverse feed worktable 5, length feed worktable 3 and vertical Feed table 14 respectively by bolt.Described approach switch 17 plays safeguard protection effect; while driving motion block motion in case stop-pass crosses that stepper motor rotates, exceed the travel range of worktable, when motion block arrive approach switch 17 detect apart from time; approach switch 17 actions, corresponding stepper motor quits work.
In described dial gauge installing mechanism, digital display centimeter mount pad 10 invests on horizontal motion block 9 by strong magnetic, and digital display centimeter 11 is fixedly installed on dial gauge mount pad 10.
In described control section, computing machine 26 is connected with PLC27 by data line 25, PLC27 is by instruction control step motor driver 29, and then the action of control horizontal stepper motor 19, longitudinal stepper motor 22 and vertical stepper motor 16, drive digital display centimeter 11 in motions horizontal, vertical, perpendicular three directions, thereby realize digital display centimeter 11 at welding deformation amounts horizontal, vertical, perpendicular (X, Y, Z) three orientation measurement vehicle frames 8.Meanwhile, the measurement result of digital display centimeter 11 is imported computing machine in real time by data line 25, and what measurement result can be directly perceived, vivid is presented in computing machine 26.
Wherein, PLC27, stepper motor driver 29 are contained in to be controlled in terminal box, by switch 28, is controlled.The hand push button switch (a-h) of switch 28 is contained in to be controlled in terminal box, and remote control gauge tap (0-7) is held in operator on hand, convenient operation.Switch 28 is controlled actions horizontal, vertical, perpendicular (X, Y, Z) three direction stepper motors, realizes the position feeding of digital display centimeter 11, measures the welding deformation amount of vehicle frame diverse location.And switch 28 comprises remote control gauge tap (0-7) and hand push button switch (a-h).Remote control gauge tap is convenient and simple for operation, and controllable distance is far away, fast response time, and hand push button switch requires closely operation, is convenient to manual control.
The course of work of a kind of agricultural machinery chassis frame of the present invention welding deformation detection platform is as follows:
Adjust the nut location on adjustable frames 20, make base plate 6 levels.Locating piece 23 is threadedly connected on base plate 6, and the crossbeam side of the vehicle frame 8 that will detect is close to located lateral piece 24, longeron side is close to longitudinal register piece 23.
To in computing machine 26, by data line 25, import in PLC27, switch 28 is controlled and is started PLC27, PLC27 sends instruction, by stepper motor driver 29, control positive action and the counteragent of horizontal stepper motor 19, longitudinal stepper motor 22, vertical stepper motor 16 simultaneously, and switch 28 also can be controlled time-out and the recovery of the course of work.
Horizontal stepper motor 19 work, drive traverse feed worktable 5 leading screws to rotate, thereby it are mobile to realize horizontal motion block 9 horizontal (directions X).When digital display centimeter 11 probes are pressed close to the upper surface of frame cross, the probe of digital display centimeter 11 can be beated because of the distortion of frame cross on vertical direction (Z direction) when laterally (directions X) is mobile, thereby measures frame cross at the welding deformation amount of vertical (Z direction).When digital display centimeter 11 probes are pressed close to the side of frame cross, the probe of digital display centimeter 11 can be beated because of the distortion of frame cross in longitudinal (Y-direction) when laterally (directions X) is mobile, thereby measures frame cross at the welding deformation amount of longitudinal (Y-direction).By data line 25, import in real time the measurement result of digital display centimeter into computing machine 26, variation tendency directly perceived on computing machine 26 corresponding softwares, image shows Frame Welding distortion.Workman, according to the measurement result in computing machine 26, determines correction position and correcting value.Approach switch 17, for limiting the stroke of horizontal motion block 9, plays safeguard protection effect.
Longitudinally stepper motor 22 work, drive the leading screw of length feed worktable 3 and length feed guide rail 13 to rotate by longitudinal synchronous cog belt 21, thereby realize first longitudinal motion block 401 and the movement of second longitudinal motion block 402 longitudinal (Y-direction).When digital display centimeter 11 probe is pressed close to the upper surface of longitudinal beam, the probe of digital display centimeter 11 can be beated because of the distortion of longitudinal beam on vertical direction (Z direction) when longitudinally (Y-direction) is mobile, thereby measures longitudinal beam at the welding deformation amount of vertical (Z direction).When digital display centimeter 11 probe is pressed close to the side of longitudinal beam, the probe of digital display centimeter 11 can be beated because of the distortion of longitudinal beam on horizontal (directions X) when longitudinally (Y-direction) is mobile, thereby measures longitudinal beam at the welding deformation amount of horizontal (directions X).By data line 25, import in real time the measurement result of digital display centimeter 11 into computing machine, on computing machine 26 corresponding softwares, intuitively represent the variation tendency of Frame Welding distortion, be convenient to vehicle frame 8 welding deformations to carry out accurate correction.Approach switch 17, for limiting the stroke of longitudinal motion block, plays safeguard protection effect.
Vertical stepper motor 16 work; by vertical synchronous cog belt 12, drive the leading screw of vertical Feed table 14 and vertical feeding guide rail 1 to rotate; thereby it is mobile at vertical direction (Z direction) to realize the first vertical motion block 201 and the second vertical motion block 202; for adjusting digital display centimeter 11 in the position of vertical direction; can measure the welding deformation amount of the upper differing heights agricultural machinery chassis frame of vertical direction (Z direction); approach switch 17, for limiting the stroke of the first vertical motion block 201 and the second vertical motion block 202, plays safeguard protection effect.
Claims (4)
1. an agricultural machinery chassis frame welding deformation detection platform, is characterized in that:
It comprises mechanical part; Described mechanical part comprises base mechanism, Three Degree Of Freedom feed mechanism and dial gauge installing mechanism, wherein,
In described base mechanism:
It is upper that base plate (6) is threadedly connected to base (7), and adjustable frames (20) is threaded under base (7), and located lateral piece (24) and longitudinal register piece (23) are threadedly connected on base plate (6);
In described Three Degree Of Freedom feed mechanism:
Longitudinally stepper motor (22) is connected with the leading screw of length feed worktable (3) by shaft coupling; The leading screw of the leading screw of length feed worktable (3) and length feed guide rail (13) is connected with synchronizing belt gear by key respectively; Longitudinally synchronous cog belt (21) one end is placed on the synchronizing belt gear of leading screw of length feed worktable (3), and the other end is placed on the synchronizing belt gear of leading screw of length feed guide rail (13); First longitudinal motion block (401) and second longitudinal motion block (402) all have respectively threaded hole and through hole; The screw set of length feed worktable (3) is in the threaded hole of first longitudinal motion block (401), and the screw set of length feed guide rail (13) is in the threaded hole of second longitudinal motion block (402); The leader casing of length feed worktable (3) is in the through hole of first longitudinal motion block (401), and the leader casing of length feed guide rail (13) is in the through hole of second longitudinal motion block (402); Length feed worktable (3) and length feed guide rail (13) are threaded connection on base plate (6);
Vertical stepper motor (16) is connected with the leading screw of vertical Feed table (14) by shaft coupling; The leading screw of the leading screw of vertical Feed table (14) and vertical feeding guide rail (1) is connected with synchronizing belt gear by key respectively; Vertical synchronous cog belt (12) one end is placed on the synchronizing belt gear of leading screw of vertical Feed table (14), and the other end is placed on the synchronizing belt gear of leading screw of vertical feeding guide rail (1); The first vertical motion block (201) and the second vertical motion block (202) all have respectively threaded hole and through hole; The screw set of vertical Feed table (14) is in the threaded hole of the first vertical motion block (201), and the screw set of vertical feeding guide rail (1) is in the threaded hole of the second vertical motion block (202); The leader casing of vertical Feed table (14) is in the through hole of the first vertical motion block (201), and the leader casing of vertical feeding guide rail (1) is in the through hole of the second vertical motion block (202); It is upper that vertical Feed table (14) is threadedly connected to second longitudinal motion block (402), and vertical feeding guide rail (1) is threadedly connected on first longitudinal motion block (401);
Horizontal stepper motor (19) is connected with the leading screw of traverse feed worktable (5) by shaft coupling; Traverse feed worktable (5) is threaded connection on the first vertical motion block (201) and the second vertical motion block (202); Laterally motion block (9) has threaded hole and through hole; The screw set of traverse feed worktable (5) is in the threaded hole of horizontal motion block (9); The leader casing of traverse feed worktable (5) is in the through hole of horizontal motion block (9);
In described dial gauge installing mechanism:
It is upper that digital display centimeter mount pad (10) is adsorbed in horizontal motion block (9), and digital display centimeter (11) is fixedly installed on dial gauge mount pad (10).
2. a kind of agricultural machinery chassis frame welding deformation detection platform as claimed in claim 1, is characterized in that:
In described Three Degree Of Freedom feed mechanism, also comprise approach switch (17), it is upper that described approach switch (17) is threadedly connected to approach switch mount pad (18), and approach switch mount pad (18) is threaded with traverse feed worktable (5), length feed worktable (3) and vertical Feed table (14) respectively.
3. a kind of agricultural machinery chassis frame welding deformation detection platform as claimed in claim 1 or 2, is characterized in that:
Described agricultural machinery chassis frame welding deformation detection platform also comprises control section,
In described control section, computing machine (26) is connected with PLC (27) by data line (25), PLC (27) is by instruction control step motor driver (29), stepper motor driver (29) is controlled horizontal stepper motor (19), longitudinal stepper motor (22) and vertical stepper motor (16), and the measurement result of digital display centimeter (11) is imported computing machine (26) into by data line (25); Wherein, described PLC (27) and stepper motor driver (29) are contained in to be controlled in terminal box, by switch (28), is controlled.
4. a kind of agricultural machinery chassis frame welding deformation detection platform as claimed in claim 3, is characterized in that:
Described switch (28) comprises remote control gauge tap and hand push button switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309622.2A CN104132607B (en) | 2014-07-01 | 2014-07-01 | A kind of agricultural machinery chassis frame welding deformation detection platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309622.2A CN104132607B (en) | 2014-07-01 | 2014-07-01 | A kind of agricultural machinery chassis frame welding deformation detection platform |
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| CN104132607A true CN104132607A (en) | 2014-11-05 |
| CN104132607B CN104132607B (en) | 2017-01-04 |
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| CN201410309622.2A Expired - Fee Related CN104132607B (en) | 2014-07-01 | 2014-07-01 | A kind of agricultural machinery chassis frame welding deformation detection platform |
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| CN104925465A (en) * | 2015-05-11 | 2015-09-23 | 池州华钛半导体有限公司 | Automatic feed test platform for semiconductors |
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| CN107378902A (en) * | 2017-06-26 | 2017-11-24 | 中车长春轨道客车股份有限公司 | A kind of high-precision instrumented wheelset chalker |
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| CN111256643A (en) * | 2020-02-17 | 2020-06-09 | 陕西科技大学 | Comprehensive measuring instrument for cylindricity and pitch of big and small head holes of connecting rod |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104925465A (en) * | 2015-05-11 | 2015-09-23 | 池州华钛半导体有限公司 | Automatic feed test platform for semiconductors |
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| CN111256643A (en) * | 2020-02-17 | 2020-06-09 | 陕西科技大学 | Comprehensive measuring instrument for cylindricity and pitch of big and small head holes of connecting rod |
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|---|---|
| CN104132607B (en) | 2017-01-04 |
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