An eccentric shaft inspection tool

Abstract

The present invention provides an eccentric shaft inspection tool for realizing the inspection of the eccentric shaft, wherein the eccentric shaft comprises a first eccentric shaft, a first cam, a second eccentric shaft and a second cam. The inspection tool comprises a base, a first cam sleeve, a first eccentric shaft sleeve, an integrated sleeve, a measuring bar and a height gauge. A first shaft hole matching the first cam is formed on the first cam sleeve; a second shaft hole matching the first eccentric shaft is formed on the first eccentric shaft sleeve, and a predetermined first eccentricity is provided between the second shaft hole and the first shaft hole; a third shaft hole and a fourth shaft hole are formed in the integrated sleeve, the third shaft hole matches the second cam, the fourth shaft hole matches the second eccentric shaft, and a predetermined second eccentricity is provided between the third shaft hole and the fourth shaft hole; the first end of the measuring bar is connected to the integrated sleeve, and the second end is a free end. The present invention has a simple structure, a fast inspection speed and a high inspection accuracy, and it improves inspection efficiency and reduces inspection costs.

Description

Technical Field

[0001] The invention relates to the field of shaft parts production, in particular to an eccentric shaft inspection tool. Background Art

[0002] Eccentric shafts are widely used in mechanical equipment. In mechanical transmission, the conversion of rotary motion into reciprocating linear motion or reciprocating linear motion into rotary motion is generally accomplished using eccentric shafts. Figure 1 to Figure 2 As shown, a typical eccentric shaft 100 is shown, which includes a first eccentric shaft 101, a first cam 102, a second eccentric shaft 103 and a second cam 104. Among them: the end of the eccentric shaft 101 is provided with a central hole, and the outer circle of the second eccentric shaft 103 is formed with a spline.

[0003] The eccentricity and angle accuracy of the eccentric shaft directly affect the performance of the entire equipment, such as Figure 1 to Figure 2 The eccentric shaft 100 in the embodiment must ensure that the eccentricity of the first eccentric shaft 101 relative to the first cam 102 and the eccentricity of the second eccentric shaft 103 relative to the second cam 104 are lower than a predetermined value before leaving the factory, and ensure that the phase angle of the eccentric shaft 100 is lower than a predetermined value. The phase angle can be characterized as the angle between the center line of the first eccentric shaft 101 and the first cam 102 and the center line of the second eccentric shaft 103 and the second cam 104.

[0004] At present, the conventional detection method for the eccentricity and phase angle of the eccentric shaft generally adopts a phase meter for detection. However, for mass production on the corresponding production line, the phase meter detection has the defects of low efficiency and high cost. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an eccentric shaft inspection tool with simple structure, fast inspection speed and high inspection accuracy. The specific technical solution of the present invention is as follows:

[0006] An eccentric shaft inspection tool is used to detect the eccentric shaft, wherein the eccentric shaft comprises a first eccentric shaft, a first cam, a second eccentric shaft and a second cam. The eccentric shaft inspection tool comprises:

[0007] Base;

[0008] a first cam shaft sleeve, the first cam shaft sleeve is connected to the base, and a first shaft hole matching the first cam is formed on the first cam shaft sleeve;

[0009] a first eccentric shaft sleeve, wherein the first eccentric shaft sleeve is connected to the base, a second shaft hole matching the first eccentric shaft is formed on the first eccentric shaft sleeve, and a predetermined first eccentricity is provided between the second shaft hole and the first shaft hole;

[0010] An integrated shaft sleeve, wherein a third shaft hole and a fourth shaft hole are formed in the integrated shaft sleeve, wherein: the third shaft hole matches the second cam, the fourth shaft hole matches the second eccentric shaft, and there is a predetermined second eccentricity between the third shaft hole and the fourth shaft hole;

[0011] a measuring bar, wherein a first end of the measuring bar is connected to the integral sleeve and a second end is a free end;

[0012] An altimeter is connected to the base.

[0013] In some embodiments, the eccentric shaft gauge further includes a zero position correction block connected to the base.

[0014] In some embodiments, the integrated sleeve includes a first connecting plate and a second connecting plate that are detachably connected together, the third axial hole is formed on the first connecting plate, and the fourth axial hole is formed on the second connecting plate.

[0015] In some embodiments, the first eccentric shaft sleeve is slidably connected to the base, and the first eccentric shaft sleeve can move between a remote position away from the first cam sleeve and a close position close to the first cam sleeve.

[0016] In some embodiments, balls are disposed on the inner walls of the first axial hole and the second axial hole.

[0017] In some embodiments, the first end of the measuring strip is screwed to the integrated sleeve via bolts, and the second end of the measuring strip is formed with a flat measuring portion.

[0018] In some embodiments, the altimeter is a dial gauge.

[0019] In some embodiments, the micrometer includes a stand, a head and a needle, the stand is connected to the base, the head is connected to the stand, and the needle is connected to the head and can move up and down in a vertical direction.

[0020] Compared with the eccentric shaft inspection tool in the prior art, the present invention has a simple structure, a fast inspection speed and a high inspection accuracy, thereby improving inspection efficiency and reducing inspection costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for practical use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them,

[0022] Figure 1 It is a structural schematic diagram of an eccentric shaft at a viewing angle;

[0023] Figure 2 It is a structural schematic diagram of an eccentric shaft from another perspective;

[0024] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the top view structure of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the base in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the first cam sleeve in the present invention;

[0028] Figure 7 It is a schematic structural diagram of the first eccentric shaft sleeve in the present invention;

[0029] Figure 8 It is a schematic diagram of the main structure of the combined shaft sleeve and the measuring bar in the present invention;

[0030] Fig. 9 It is a left-side structural schematic diagram of the combined shaft sleeve and measuring bar in the present invention;

[0031] Fig.10 It is a schematic diagram of the top view of the combined shaft sleeve and measuring strip in the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The use of a phase meter to detect a crankshaft has the disadvantages of low detection efficiency and high detection cost. In view of this, the present invention provides an eccentric shaft inspection tool with a simple structure and low cost.

[0034] The present invention is particularly suitable for Figure 1 , Figure 2 The eccentric shaft 100 is detected, and the eccentric shaft 100 includes a first eccentric shaft 101, a first cam 102, a second eccentric shaft 103 and a second cam 104.

[0035] like Figures 3 to 10 As shown, the eccentric shaft inspection tool of the present invention at least comprises a base 1, a first cam shaft sleeve 2, a first eccentric shaft sleeve 3, an integrated sleeve 4, a measuring bar 5 and a height gauge 6. Optionally, the eccentric shaft inspection tool of the present invention further comprises a zero position correction block 7. Specifically:

[0036] The first cam sleeve 2 is connected to the base 1, and a first shaft hole 21 matching the first cam 102 is formed on the first cam sleeve 2. Optionally, the first cam sleeve 2 is fixedly connected to the base 1 via bolts.

[0037] The first eccentric shaft sleeve 3 is connected to the base 1 . A second shaft hole 31 matching the first eccentric shaft 101 is formed on the first eccentric shaft sleeve 3 . A predetermined first eccentricity is provided between the second shaft hole 31 and the first shaft hole 21 .

[0038] A third shaft hole 41 and a fourth shaft hole 42 are formed in the integrated shaft sleeve 4, wherein the third shaft hole 41 matches the second cam 104, the fourth shaft hole 42 matches the second eccentric shaft 103, and there is a predetermined second eccentricity between the third shaft hole 41 and the fourth shaft hole 42.

[0039] One end of the measuring strip 5 is connected to the integral shaft sleeve 4, and the other end is a free end.

[0040] A height gauge 6 is connected to the base 1 and is used to measure the height of the free end of the measuring strip 5 .

[0041] In the present invention, the sizes of the first axial hole 21, the second axial hole 31, the third axial hole 41 and the fourth axial hole 42, the first eccentricity between the second axial hole 31 and the first axial hole 21, and the second eccentricity between the third axial hole 41 and the fourth axial hole 42 are all prefabricated based on the standard qualified parts of the eccentric shaft being tested.

[0042] In other words, if the first cam 102 and the first eccentric shaft 101 of the eccentric shaft being tested can smoothly enter the first shaft hole 21 and the second shaft hole 31, it means that the size of the first cam 102 and the first eccentric shaft 101 and the eccentricity between the two are qualified, otherwise, it is considered unqualified. Similarly, if the second cam 104 and the second eccentric shaft 103 of the eccentric shaft being tested can smoothly enter the third shaft hole 41 and the fourth shaft hole 42, it means that the size of the second cam 104 and the second eccentric shaft 103 and the eccentricity between the two are qualified, otherwise, it is considered unqualified.

[0043] Before testing the eccentric shaft to be tested, the altimeter 6 is first zero-calibrated. Optionally, in order to facilitate the zero-calibration, the present invention further includes a zero-calibration block 7 connected to the base. When the needle of the altimeter 6 just hits the upper end surface of the zero-calibration block 7, the reading of the altimeter 6 is zero.

[0044] Below, we will continue to Figure 3 , Figure 4 For reference, the specific working process of the eccentric shaft inspection fixture of the present invention is described exemplarily:

[0045] Step 1: Insert the first eccentric shaft 101 and the first cam 102 of the eccentric shaft 100 to be tested toward the first shaft hole 21 on the first camshaft sleeve 2. If the first eccentric shaft 101 and the first cam 102 can be inserted into the second shaft hole 31 and the first shaft hole 21 respectively, it means that the size of the first cam 102 and the first eccentric shaft 101 and the eccentricity between the two are qualified, and the process proceeds to step 2. Otherwise, it is considered unqualified and the test of the current eccentric shaft 100 is stopped.

[0046] After the detection in step 1, the eccentric shaft 100 currently being detected is fixed on the first camshaft sleeve 2 and the first eccentric shaft sleeve 3 .

[0047] Step 2: Put the third shaft hole 41 on the integrated shaft sleeve 4 toward the second eccentric shaft 103 of the eccentric shaft 100. If the second eccentric shaft 103 and the second cam 104 can be respectively inserted into the fourth shaft hole 42 and the third shaft hole 41, it means that the size of the second eccentric shaft 103 and the second cam 104 and the eccentricity between the two are qualified, and proceed to step 3. Otherwise, it is considered unqualified and the detection of the current eccentric shaft 100 is stopped.

[0048] After the detection in step 2, the size and eccentricity of the eccentric shaft 100 currently being detected are considered qualified. At this time, the free end of the measuring bar 5 extends out of the position where the height gauge 6 is located.

[0049] Step 3: Move the pointer of the altimeter 6 to the free end of the measuring bar 5 to measure the height of the free end of the measuring bar 5. Based on the height value of the free end of the measuring bar 5, the phase angle value of the eccentric shaft 100 being detected can be obtained.

[0050] Optionally, by adaptively adjusting the height of the zero correction block 7, when the eccentric shaft being tested is a standard part, the free end of the measuring bar 5 is exactly located at the same horizontal plane as the top surface of the zero correction block 7, that is, the reading of the altimeter 6 is zero. Therefore, the larger the absolute value of the reading of the altimeter 6 (that is, the greater the degree to which the free end of the measuring bar 5 deviates from the top surface of the zero correction block 7), the larger the phase angle of the eccentric shaft 100 currently being tested, and vice versa, the smaller the phase angle.

[0051] It is easy to imagine that there is a definite numerical relationship between the reading of the altimeter 6 and the phase angle of the detected eccentric shaft 100, and this numerical relationship can be characterized by a definite quantitative relationship (or functional relationship), that is: based on the current reading of the altimeter 6, the phase angle of the currently detected eccentric shaft 100 can be obtained.

[0052] In order to quickly obtain the phase angle value, in some embodiments, the numerical correspondence between the altimeter reading and the phase angle of the eccentric shaft is pre-filled in a mapping table. After obtaining the altimeter reading, the corresponding phase angle value is quickly obtained by searching the mapping table.

[0053] It can be seen that the present invention converts angle detection into height detection through the measuring bar 5, thereby simplifying the detection difficulty. In addition, a slight change in the phase angle will bring about a significant change in the height value of the free end of the measuring bar 5, that is, the measuring bar 5 amplifies the detection amount, thus greatly improving the detection accuracy of the phase angle.

[0054] Of course, theoretically, the longer the measuring strip 5 is, the higher the measurement accuracy of the phase angle is. However, in order to prevent the measuring strip 5 from being bent due to being too long, in a specific embodiment, the length of the measuring strip 5 needs to be adaptively selected.

[0055] Optional, such as Fig. 9 As shown, the integrated sleeve 4 includes a first connecting plate and a second connecting plate that are detachably connected together, a third shaft hole 41 is formed on the first connecting plate, and a fourth shaft hole 42 is formed on the second connecting plate. The first connecting plate and the second connecting plate are detachably connected together via bolts.

[0056] Optionally, the first eccentric shaft sleeve 3 is slidably connected to the base 1, and the first eccentric shaft sleeve 3 can move between a position away from the first cam sleeve 2 and a position close to the first cam sleeve 2. By slidably connecting the first eccentric shaft sleeve 3 to the base 1, in step 1 of the detection process:

[0057] First, move the first eccentric shaft sleeve 3 to the far position, and then insert the first cam 102 into the first shaft hole 21. If the first cam 102 cannot be inserted, the test is terminated directly and it is considered unqualified. Otherwise, move the first eccentric shaft sleeve 3 to the close position to observe whether the first eccentric shaft 101 can smoothly enter the second shaft hole 31.

[0058] Optional, such as Figure 4 As shown, in order to reduce the friction between the eccentric shaft 100 being detected and the first shaft hole 21 and the second shaft hole 31 , balls are provided on the inner walls of the first shaft hole 21 and the second shaft hole 31 .

[0059] Optional, such as Figure 3 As shown, the altimeter 6 is a micrometer, which includes a table frame 61, a table head 62 and a needle 63. The table frame 61 is connected to the base 1, the table head 62 is connected to the table frame 61, and the needle 63 is connected to the table head 62 and can move up and down in the vertical direction to achieve contact with the free end of the measuring bar 5. Optionally, as Fig.10As shown, the first end of the measuring strip 5 is screwed to the integrated sleeve via bolts, and the second end of the measuring strip 5 is formed with a flat measuring portion.

[0060] The present invention has been described in sufficient detail with certain particularity. It should be understood by those skilled in the art that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present invention should fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the claims, rather than by the above description in the embodiments.

Claims

1. An eccentric shaft inspection tool, which is used to detect an eccentric shaft, wherein the eccentric shaft comprises a first eccentric shaft, a first cam, a second eccentric shaft and a second cam, and is characterized in that: It includes: Base; A first cam shaft sleeve, the first cam shaft sleeve is connected to the base, and a first shaft hole matching the first cam is formed on the first cam shaft sleeve; a first eccentric shaft sleeve, wherein the first eccentric shaft sleeve is connected to the base, a second shaft hole matching the first eccentric shaft is formed on the first eccentric shaft sleeve, and a predetermined first eccentricity is provided between the second shaft hole and the first shaft hole; An integrated shaft sleeve, wherein a third shaft hole and a fourth shaft hole are formed in the integrated shaft sleeve, wherein: the third shaft hole matches the second cam, the fourth shaft hole matches the second eccentric shaft, and there is a predetermined second eccentricity between the third shaft hole and the fourth shaft hole; a measuring bar having a first end connected to the integral sleeve and a second end being a free end; and an altimeter connected to the base; It also includes a zero correction block connected to the base; Balls are arranged on the inner walls of the first shaft hole and the second shaft hole.

2. The eccentric shaft inspection fixture according to claim 1, characterized in that: The integrated shaft sleeve comprises a first connecting plate and a second connecting plate which are detachably connected together, the third axial hole is formed on the first connecting plate, and the fourth axial hole is formed on the second connecting plate.

3. The eccentric shaft inspection fixture according to claim 1, characterized in that: The first eccentric shaft sleeve is slidably connected to the base, and the first eccentric shaft sleeve can move between a remote position away from the first cam sleeve and a close position close to the first cam sleeve.

4. The eccentric shaft inspection fixture according to claim 1, characterized in that: The first end of the measuring strip is screwed onto the integrated sleeve via bolts, and the second end of the measuring strip is formed with a flat measuring portion.

5. The eccentric shaft inspection fixture according to claim 1, characterized in that: The altimeter is a micrometer.

6. The eccentric shaft inspection fixture according to claim 5, characterized in that: The micrometer comprises a meter frame, a meter head and a meter needle, wherein the meter frame is connected to the base, the meter head is connected to the meter frame, and the meter needle is connected to the meter head and can move up and down in a vertical direction.

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