JP2002250283A - Inspection device for compression mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device capable of being applied to a compression mechanism of a swinging rotary compressor and enhancing an inspection efficiency. SOLUTION: The inspection device is the one of a swinging piston type rotary compressor in which a piston 60 is swingably provided on a cylinder 51. The cylinder 51 is relatively rotated between a driving shaft 51 and it. A rotation angle detector 16 detects a relative rotation angle of the driving shaft 52 and the cylinder 51. A torque detector 18 detects a torque valve applied to the driving shaft 52. A wave shape leading out means 43 leads out a torque wave shape indicating a fluctuation of the detected torque against the detected rotation angle. A failure judgment part 35 judges a failure position, in the torque wave shape, based on a wave shape parameter including a peak width, i.e., a width of a peak area where a torque is fluctuated to a predetermined value or more and a peak position in the peak area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for a compression mechanism, and more particularly to a measure for detecting a defective portion.

[0002]

2. Description of the Related Art Heretofore, there has been known a compressor which transmits a driving force generated by an electric mechanism to a compression mechanism via a crankshaft and compresses the refrigerant by the compression mechanism. 2. Description of the Related Art In a manufacturing line of a compressor of this kind, an assembly inspection for inspecting the presence or absence of an assembly defect is performed when the assembly of a compression mechanism is completed. In this assembly inspection, detection of an assembly failure such as entry of foreign matter into the compression mechanism is performed based on a detected torque when the crankshaft of the compression mechanism is rotated.

[0003] As disclosed in Japanese Patent Application Laid-Open No. 1-267377, for example, an inspection device for detecting this assembly failure uses a rotation angle detector and a torque detector, and uses a torque waveform obtained to perform compression. There are those that classify the assembly failure of the mechanism. This inspection device performs Fourier transform of the torque waveform and compares the peak value and peak phase of the obtained output waveform with the regular waveform, thereby classifying assembly failures into crankshaft tightening failures, drive pin peripheral failures, etc. are doing.

[0004]

However, the inspection apparatus disclosed above is intended for a scroll compressor, and has a problem that it is difficult to apply it directly to a compression mechanism of an oscillating piston type rotary compressor. there were. On the other hand, the inspection apparatus is configured to perform comparison with the normal waveform only by the peak value and the peak phase of the output waveform obtained by the Fourier transform. The details of the defect could not be determined. As a result, there is a problem that the inspector cannot easily find the defective portion, it takes a long time for the inspection, and the inspection efficiency cannot be improved.

The present invention has been made in view of the above circumstances, and has as its object to provide an inspection apparatus which can be applied to a compression mechanism of a swinging piston type rotary compressor and improves inspection efficiency. is there.

[0006]

According to the present invention, a defective portion is determined based on waveform parameters including a peak width and a peak position in a peak area.

More specifically, a first solution means is to use a cylinder (51) provided with a piston (60) swingably provided in a swinging piston type compressor and a compression mechanism inspection apparatus as a premise. A rotation means (22) for relatively rotating the drive shaft (52) of the compression mechanism (50) and the relative rotation angle between the cylinder (51) and the drive shaft (52) by the rotation means (22); A rotation angle detection means (16) for detecting, a torque detection means (18) for detecting a torque acting on the drive shaft (52) during the relative rotation by the rotation means (22), and the rotation angle detection means (16) Torque detection means (1
8) A waveform deriving means (43) for deriving a torque waveform indicating the fluctuation of the detected torque, and in the torque waveform derived by the waveform deriving means (43), the width of the peak region in which the torque has fluctuated to a predetermined value or more. Determining means (35) for determining a defective portion based on a waveform parameter including a certain peak width and a peak position in the peak area;

[0008] A second solution is the first solution, wherein the cylinder (51) is provided with a cylinder body (53).
And cylinder heads (56) at both ends of the cylinder body (53)
On the other hand, the determination means (35) determines that one peak region appears during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and that the peak width is less than a predetermined value. And a peripheral surface determining unit (38) that determines that the peripheral surface is defective due to an abnormal sliding surface between the cylinder body (53) and the piston (60).
a).

A third solution is the first solution, wherein the cylinder (51) is a cylinder body (53).
And cylinder heads (56) at both ends of the cylinder body (53)
On the other hand, the determination means (35) determines that one peak region appears during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and that the peak width is equal to or larger than a predetermined value. And a flat end surface determining unit (38b) for determining that the flat end surface is defective due to an abnormal sliding surface between the cylinder head (56) and the piston (60) and deriving a defective position.

A fourth solution is the first solution, wherein the cylinder (51) is a cylinder body (53).
And cylinder heads (56) at both ends of the cylinder body (53)
The piston (60) includes a piston body (62) and a blade (63). The blade (63) is fitted to the cylinder body (53) via a bush (70).
The determining means (30) determines that the first peak area and the second peak area appear during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and the peak width of both peak areas is a predetermined value. That is, the ratio of the peak values of both peak regions is within a predetermined range, the peak position of each peak region is biased toward the leading side of the detected rotation angle, and the bottom position of the detected torque between both peak regions is the second position. When the cylinder body (53) and the bush (70) are biased toward the one peak area and the bottom position between the second peak area and the first peak area during the next rotation is biased toward the second peak area. And a bush determination section (39a) for determining that the bush is defective due to an abnormal sliding surface.

According to a fifth aspect of the present invention, in the first aspect, the cylinder (51) includes a cylinder body (53).
And cylinder heads (56) at both ends of the cylinder body (53)
The piston (60) includes a piston body (62) and a blade (63). The blade (63) is fitted to the cylinder body (53) via a bush (70).
The determining means (30) determines that the first peak area and the second peak area appear during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and the peak width of both peak areas is a predetermined value. That is, the ratio of the peak values of both peak areas is within a predetermined range, the peak position of each peak area is located near the center of each peak area, and the bottom position of the detected torque between both peak areas is Positioned near the center between the regions, the bottom position between the second peak region and the first peak region during the next rotation is located within a predetermined range, and the peak position of each peak region is located within the predetermined range. In this case, there is provided a blade determining unit (39b) that determines that the blade is defective due to an abnormal sliding surface between the blade (63) and the bush (70).

A sixth aspect of the present invention is based on the first aspect, wherein the judging means (35) determines that the drive shaft (52) is provided when the peak area does not appear and the detected torque is equal to or more than a predetermined value. Drive shaft determination unit (36a) that determines that there is a poor fit
It has.

In a seventh aspect of the present invention, in the first aspect, the drive shaft determining section (36) determines that there is no failure if the peak area does not appear and the detected torque is less than a predetermined value. It is provided with a failure absence determination unit (36b) for determination.

In an eighth aspect based on the first aspect, the determining means (35) determines that the foreign matter is defective if the peak area is not reproduced for each rotation. ).

A ninth solution means according to the first solution means, wherein the torque detection means (1) is provided for each predetermined rotation range.
An averaging means (32) for averaging the detected torque of 8) is provided.

In a tenth aspect of the present invention, in the first aspect, a predetermined value for recognizing that the torque detected by the torque detecting means (18) is in a peak region is determined by a value given by an inspector. Level input means (44) is provided for inputting by adding the minimum value of the torque.

An eleventh aspect of the present invention is the first aspect of the invention, wherein the predetermined value for recognizing the peak area is adjusted using a standard deviation indicating a variation in the torque detected by the torque detecting means (18). And a peak area correcting means (45) for correcting the peak width.

A twelfth solution means according to the eleventh solution means, wherein when the peak area correction means (45) performs a correction for enlarging the peak width, if the adjacent peak areas overlap, this adjacent A peak region integrating means (47) for recognizing a matching peak region as one peak region is provided.

According to a thirteenth solution means, in the first solution means, when a peak area over two rotations appears, the peak area distribution means (46) recognizes that the peak area appears only in one of the rotations. ).

According to a fourteenth aspect of the present invention, in the first aspect, when a peak region appears in two or more rotations, it is determined whether or not the peak region is the same region based on the detected rotation angle and the peak value. Same area confirmation means (48)
It has.

Further, a fifteenth solving means includes a result display means (40) for displaying a defective portion determined by the determining means (35) in the first solving means.

A sixteenth aspect of the present invention is the first aspect of the present invention, wherein the rotation determining means adjusts the measured rotation speed based on the torque waveform derived by the waveform deriving means (43) and whether or not the peak area is reproduced. Means (41).

That is, in the first solving means, when the rotating means (22) relatively rotates the cylinder (51) and the drive shaft (52), the piston (60) is driven by the relative rotation of the drive shaft (52). ) Swings in the cylinder (51). The waveform deriving means (43) derives a torque waveform indicating a fluctuation of the detected torque of the torque detecting means (18) with respect to the detected rotation angle of the rotation angle detecting means (16). The determining means (35) determines a defective portion in the torque waveform based on waveform parameters including a peak width, which is a width of a peak region where the torque fluctuates by a predetermined value or more, and a peak position in the peak region. That is,
In the compression mechanism (50) of the oscillating piston compressor, a peak region appears corresponding to the defective portion, so the defective portion is determined based on the waveform parameters including the peak width and the peak position.

Further, in the second solving means, the first solution
In the solving means, if one peak region appears during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and the peak width is less than a predetermined value, the peripheral surface determination unit (38a ) Determines that the peripheral surface is defective due to an abnormal sliding surface between the cylinder body (53) and the piston (60), and derives the defective position. That is, a part of each of the sliding surfaces of the cylinder body (53) and the piston (60) comes into sliding contact with each other. Further, the defective portion of the sliding surface is slid once in one rotation of the relative rotation. In the compression mechanism (50) of the oscillating rotary compressor, the defective position in the circumferential direction corresponds to the detected rotation angle.
Therefore, if there is an abnormality in the sliding surface between the cylinder body (53) and the piston (60), it is determined that the peripheral surface is defective because the narrow peak region appears once during one rotation. In addition, the defective position can be derived.

In the third solution, the first solution
In the solving means, one peak region appears during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), and if the peak width is equal to or more than a predetermined value, the flat end face determination unit (38)
In b), it is determined that the flat end surface is defective, which is an abnormal sliding surface between the cylinder head (56) and the piston (60), and the defective position is derived. That is, on the sliding surface between the cylinder head (56) and the piston (60), the entire piston (60) is in sliding contact with a part of the cylinder head (56). Therefore, when there is an abnormality in the sliding surface between the cylinder head (56) and the piston (60), a peak region wider than that in the case of the peripheral surface defect appears. In addition, it is possible to determine that the flat end face is defective, and to derive the defective position.

In the fourth solution, the first solution
In the solving means, when two peak areas appear during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), the bush determination section (39a) determines that the peak widths of both peak areas are predetermined. Value, the ratio of the peak values of both peak regions is within a predetermined range, the peak position of each peak region is biased toward the leading side of the detected rotation angle, and the bottom position of the detected torque between both peak regions is the second position. When the cylinder body (53) and the bush (70) are biased toward the one peak area and the bottom position between the second peak area and the first peak area during the next rotation is biased toward the second peak area. ) Is judged to be a bush defect which is an abnormal sliding surface. In other words, the bush (70) performs one reciprocating swing motion during one rotation, and the blade (63) performs one reciprocating forward / backward motion with respect to the bush (70). The bush (70) temporarily stops moving at 90 ° and 270 ° with respect to the top dead center position of the piston (60), and then reverses. Further, the blade (63) has the largest movement at around 90 ° and around 270 ° and slides with the bush (70). Therefore, the cylinder body (53) formed by the bush (70) around 90 ° and around 270 °. The pressure on the bush (70) increases to increase the torque, but the torque sharply decreases as the bush (70) stops and reverses. As a result, when there is an abnormality in the sliding surface between the cylinder body (53) and the bush (70), two peak regions appear during one rotation, and the peak width of both peak regions is a predetermined width. The ratio of the peak values of both peak regions is within a predetermined range, the peak position in each peak region is biased toward the leading side of the detected rotation angle, and the bottom position between both peak regions is biased toward the first peak region. , The bottom position between the second peak region and the first peak region during the next rotation is biased toward the second region. Therefore, it is possible to determine a bush failure based on each peak width and the like.

Further, in the fifth solution means, the first solution
In the solving means, when two peak regions appear during one rotation of the relative rotation between the cylinder (51) and the drive shaft (52), the blade determination unit (39b) determines that the peak widths of both peak regions are predetermined. Value, the ratio of the peak values of both peak regions is within a predetermined range, the peak position of each peak region is located near the center of each peak region, and the bottom position of the detected torque between both peak regions is The bottom position between the peak position of the second peak region and the first rotating peak region in the next rotation is located within a predetermined range, and the peak position of each peak region is within the predetermined range. If it is located inside, it is determined that the blade is defective due to an abnormal sliding surface between the blade (63) and the bush (70). That is, the blade (63) is at 90 ° with respect to the top dead center position of the piston (60).
At the positions of 270 ° and 270 °, the movement becomes the largest and slides with the bush (70), while at the positions of 0 ° and 180 °, the movement becomes the smallest and reversely slides with the bush (70). As a result, if there is an abnormality in the sliding surface between the blade (63) and the bush (70), two peak areas appear during one rotation, and each peak width becomes a predetermined value or more. The ratio of the peak values is within a predetermined range, the peak position in each peak region is closer to the center, the bottom position between both peak regions is closer to the center between both peak regions, and the peak position of the second peak region is The bottom position between the next rotating first peak area is located within a predetermined range, and the peak position of each peak area is located within the predetermined range. Therefore, it can be determined that the blade is defective based on the peak width and the like.

In the sixth solution, the first solution
In the solving means, if the peak area does not appear and the detected torque is equal to or more than the predetermined value, the drive shaft determination unit (36)
a) determines that the drive shaft (52) is not properly fitted. That is, when there is an abnormality in the fitting of the drive shaft (52), the peak region does not appear, but the level of the detected torque rises, so that it is possible to determine that the fitting of the drive shaft (52) is poor.

[0029] In the seventh solution means, the first solution
In the solving means, if the detected torque is less than the predetermined value without the peak area appearing, the defect absence determination section (36b)
Judge that there is no defect.

[0030] In the eighth solution, the first solution
If the peak area is not reproduced for each rotation, the foreign matter mixing determination unit (37) determines that there is a foreign matter mixing failure.

Further, in the ninth solution means, the first solution
The averaging means (32) averages the detected torque of the torque detecting means (18) for each predetermined detection rotation range.

In the tenth solution, in the first solution, the torque detected by the torque detecting means (18) is obtained by adding a value arbitrarily given by an inspector and a minimum value of the detected torque. The value is input to the level input means (44).

[0033] In the eleventh solution, the peak area correction means (45) may be different from the first solution.
Using the standard deviation indicating the variation of the detected torque of the torque detecting means (18), a predetermined value for recognizing the peak area is adjusted, and the peak width is corrected. That is, for example, by adjusting the predetermined value to cope with a case where the detected torque starts increasing before reaching the predetermined value or a case where the detected torque continues to decrease even when the detected torque decreases below the predetermined value, Correct peak width.

In the twelfth solution means, in the eleventh solution means, when the peak area correction means (45) performs a correction for enlarging the peak width and the adjacent peak areas overlap each other, the peak is corrected. The region integrating means (47) recognizes adjacent peak regions as one peak region.

In the thirteenth solution means, in the first solution means, when a peak region extending over two rotations appears, the peak region distribution means (46) causes the peak region to appear only in one of the rotations. Recognize that you have done it.

In the fourteenth aspect, in the first aspect, when a peak area appears in two or more rotations, the same area checking means (48) determines the same based on the detected rotation angle and the peak value. It is determined whether or not the area is a peak area.

In the fifteenth solution, the first solution
In the above solution, the result display means (40) displays the defective part determined by the determination means (35).

Further, in the sixteenth solution, the first solution
In the solving means (1), the rotation determining means (41) adjusts the measured rotational speed based on the torque waveform derived by the waveform deriving means (43) and whether or not the peak area is reproduced.

[0039]

Therefore, according to the above-mentioned solution, in the inspection apparatus for the compression mechanism (50) in the oscillating piston compressor, the defective portion is determined based on the waveform parameters including the peak width and the peak position. As a result, it is possible to determine even the details of the defect. As a result, even an unskilled inspector can easily find a defective portion and improve the inspection efficiency.

Further, according to the second and third means, when one peak region appears during one rotation, it is possible to reliably determine that the peripheral surface or the flat end surface is defective.
Further, the defective position in the circumferential direction can be reliably determined based on the peak position.

Further, according to the fourth and fifth solving means, when two peak regions appear during one rotation, it is possible to reliably determine a bush defect or a blade defect.

Further, according to the sixth aspect, when there is no peak region, it is possible to reliably determine a poor fitting of the drive shaft (52) whose detected torque increases regardless of the detected rotation angle. .

Further, according to the seventh solution, it is possible to reliably determine whether there is a defect.

Further, according to the eighth means, it is possible to reliably determine a foreign matter mixing defect in which the peak area is not reproduced for each rotation.

According to the ninth solution, the detected torque is averaged for each predetermined rotation range, so that the influence of disturbance due to a measurement error or the like can be suppressed and the determination accuracy can be improved. Can be done.

According to the tenth aspect, the predetermined value for determining the peak area is determined based on the value given by the inspector. For example, the predetermined value is changed with reference to the torque waveform. The peak area can be determined based on the predetermined value.

According to the eleventh solution, the predetermined value for determining the peak area is adjusted using the standard deviation indicating the variation in the detected torque, so that the predetermined value is automatically and appropriately adjusted. Can be modified. Therefore, the peak region can be appropriately corrected, and the accuracy of determining the peak region can be improved.

Further, according to the twelfth and thirteenth solving means, it is possible to prevent a peak area that appears due to the same cause of failure from being recognized as a separate peak area.

Further, according to the fourteenth solving means, it is possible to reliably determine whether or not the peak area appears due to the same cause of failure.

Further, according to the fifteenth solving means, since the defective part is displayed, the inspector can immediately know the defective part, and the inspection efficiency can be further improved.

Further, according to the sixteenth aspect, the measurement rotational speed can be adjusted to an appropriate value.

[0052]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Inspection device (10) for compression mechanism of this embodiment
Is the cylinder (5) of the compression mechanism (50) as shown in FIG.
1) is configured to be attachable, rotates the cylinder (51), and outputs a control signal while the device main body (11); and a controller (30) that processes the control signal output from the device main body (11). And This inspection device (10)
The compression mechanism that constitutes the oscillating piston type rotary compressor (5
An inspection device (10) for detecting an assembly failure of (0). The compression mechanism (50) includes a crankshaft (5
The driving force is transmitted via 2).

The apparatus main body (11) includes a work receiving table (12) for mounting a cylinder (51), a drive motor (15) for rotating the work receiving table (12), and a rotation angle detector (16). ) And a chuck (1
7) and a torque detector (18). And
The work support (12), the chuck (17), and the torque detector (18) are arranged on the same axis. The work receiving base (12) is formed in a bottomed cylindrical shape, and includes a side plate (13) and a bottom plate (14). At the center of the bottom plate (14), a through-hole (19) for passing the crankshaft (52) of the compression mechanism (50) is provided. The work cradle (12)
The compression mechanism (50) is mounted with the crankshaft (52) arranged so as to extend downward.

The drive motor (15) is arranged so as to be in contact with the side plate (13) of the work pedestal (12), and by rotating the work pedestal (12), the compression mechanism (50).
Is rotated around the crankshaft (52). The drive motor (15) is constituted by, for example, a servomotor. The rotation angle detector (16) is arranged to be in contact with the side plate (13) of the work support (12),
It constitutes a rotation angle detecting means for detecting the rotation angle of the work cradle (12). The rotation angle detector (16) is configured to output a control signal. The rotation angle detector (16)
For example, it is configured to include a rotary encoder, a zero position detection sensor, and a work positioning pin.

The chuck (17) has a key groove (2
0) is a U-shaped member provided with the keyway (2
The lower end of the crankshaft (52) is inserted into 0). The chuck (17) is for fixing the crankshaft (52) so as not to rotate. That is,
Drive motor (15), work holder (12) and chuck (1
By 7), a rotating means (22) for relatively rotating the cylinder (51) and the crankshaft (52) is configured. The chuck (17) is connected to the torque detector (18).
The torque detector (18) is connected to the center of the lower surface of the chuck (17), and constitutes torque detecting means for detecting a torque value of the crankshaft (52). The torque detector (18)
It is configured to output a control signal. The torque detector (18) is fixed to the gantry (21).

The compression mechanism (50) constituting the swinging piston type rotary compressor is configured by disposing a piston (60) in a cylinder (51). The above cylinder (5
1) is a cylindrical cylinder body (5) as shown in FIG.
3) and a disk-shaped cylinder head (56) attached to both end planes (54) of the cylinder body (53). That is, the cylinder (51) is configured such that the cylinder body (53) is sandwiched between the cylinder heads (56).
The crankshaft (52) penetrates the cylinder body (53) and the cylinder head (56). Crankshaft (52)
Is slidably supported by the cylinder head (56).

The piston (60) is connected to the cylinder body (5
As shown in FIGS. 3 and 4, in the hollow portion 3), a part of the inner peripheral surface of the cylinder body (53) is arranged to be in contact with the refrigerating machine oil through an oil film. Piston (60)
Is configured such that a roller (62) as a piston body and a rod-shaped blade (63) are integrally formed. The piston (60) is connected to the cylinder head (5
6) The two flat surfaces (61) that are the end faces are the cylinder head (5
It is disposed so as to be in sliding contact with a part of the inner end face (57) of 6) via the oil film of the refrigerating machine oil.

A compression chamber (65) is formed by the inner end surface (57) of the cylinder head (56), the inner peripheral surface (55) of the cylinder body (53), and the piston (60). An eccentric part (66) formed integrally with the crankshaft (52) is fitted into the center of the roller (62). The roller (62) is slidably supported by the eccentric portion (66), and is configured to revolve via the eccentric portion (66) when the crankshaft (52) rotates. That is, the piston (60) swings so that the outer peripheral surface (64) of the roller (62) is in sliding contact with the inner peripheral surface (55) of the cylinder body (53) via the oil film of the refrigerating machine oil,
Both planes (61) are the inner end faces (57) of the cylinder head (56)
Oscillates while sliding through the oil film of the refrigerating machine oil.

The cylinder body (53) includes a blade (6
A blade hole (69) for inserting 3) is formed. A pair of bushes (70) having a semicircular cross section are arranged in the blade hole (69). And the blade (6
The tip of 3) is inserted between both bushes (70). That is, the blade (63) is fitted to the cylinder body (53) via the bush (70). The blade (63)
Both bushes (70) move forward and backward between the bushes (70) while sliding through the oil film of the refrigerating machine oil, and the bushes (70) are connected to the cylinder body (53) and the refrigerating machine oil in the blade holes (69). It is configured to swing while sliding through the oil film. In the cylinder body (53), the suction port (71) and the discharge port (72) sandwich the blade hole (69).
Are formed. The suction port (71) is for introducing the refrigerant into the cylinder (51), and the discharge port (72)
Is for discharging the compressed refrigerant to the outside of the cylinder (51).

As shown in FIG. 1, the controller (30) receives the control signals output by the rotation angle detector (16) and the torque detector (18). The controller (30)
The waveform input section (31), the waveform recognition section (33), and the reproduction confirmation section (3
4), a failure determination unit (35), a result display unit (40), and a circuit determination unit (41).

The waveform input section (31) is configured to input a detected torque value, while averaging means (32) for executing a filtering process for averaging the detected torque value for each predetermined rotation range. It has. In the filtering process, as shown in FIG. 5, a detected torque value at a certain detected rotation angle Tp is obtained by averaging n detected torque values before and after the detected detected rotation angle Tp (total 2n + 1 detected torque values). Value. However, if filtering is performed,
The waveform is smoothed and the peak value decreases. Therefore, as shown in FIG. 6, a range in which the specified value dy is added to the minimum value of the 2n + 1 detected torque values is set, and the detected torque value at a certain detected rotation angle Tp is equal to or larger than this range, and 2n + 1 When the detected torque value is the maximum value, the filtering process is not executed for the detected torque value at the detected rotation angle Tp.

The waveform input section (31) includes a waveform deriving means (43) for deriving a torque waveform indicating a change in the detected torque value with respect to the detected rotation angle. The waveform input section (3
1) With respect to the detected torque value with respect to the detected rotation angle obtained by rotating multiple times, m detected torque values from the detected rotation angle Ro to the detected rotation angle Rm-1 are stored for each rotation. , The maximum value of the detected torque value th-max and the minimum value for each rotation
Th-min, average value Th-ave, and standard deviation σ are derived, and these values are also stored.

As shown in FIG. 7, the waveform recognizing section (33) includes a level input means (4) to which a flat value Th-flat is input.
4) equipped. The flat value Th-flat input to the level input means (44) is the minimum value Th-mi of the detected torque value.
n and a value obtained by adding an arbitrary constant value to the minimum value Th-min. This arbitrary constant value is a value input by the inspector. Since the detected torque value fluctuates slightly even when the compression mechanism (50) has no assembly failure, a flat value
If it is less than Th-flat, it is recognized that it is within the range of the flat level, and the peak detected by the minute fluctuation is removed.

The waveform recognizing section (33) recognizes, as a peak area, a region where the detected torque value continuously fluctuates more than the flat value Th-flat in the torque waveform indicating the fluctuation of the detected torque value with respect to the detected rotation angle. It is configured as follows.
In the peak region, when the detected torque value gradually increases, the detected rotation angle at which the detected torque value becomes a flat value Th-flat becomes the beginning of the peak region, and when the detected torque value gradually decreases, the detection is performed. Torque value is flat value Th-fla
The detected rotation angle that becomes t is the end of the peak region. As shown in FIG. 8, the rotation angle difference between the end and the start of the peak area is
This is the width of the peak area. Then, the waveform recognition unit (33)
In each peak area, a peak value at which the detected torque value is maximum, and a peak position that is a detected rotation angle corresponding to the peak value are stored. The waveform recognizing unit (33) stores a bottom value at which the detected torque value is the minimum value between the peak regions, and a bottom position as a detected rotation angle corresponding to the bottom value.

The waveform recognition section (33) includes a peak area correcting means (45). In other words, the region where the detected torque value is equal to or greater than the flat value Th-flat is defined as the peak region. The flat value Th-flat is obtained by adding the minimum value Th-min to a constant value arbitrarily set by the inspector. Because there is
In some cases, the start and end of the peak region cannot be accurately estimated. For example, even when the torque waveform is smaller than the flat value Th-flat, the detected torque value may have already started increasing or the detected torque value may have continued decreasing. Therefore, the start and end of the peak region are automatically corrected using the standard deviation indicating the degree of variation of the detected torque value.

The peak area correction means (45) uses the safety value Th-lo representing the safety level of the detected torque value and the caution value Th-hi representing the caution level of the detected torque value to determine the peak area. It is configured to correct. Safety value Th-lo
Is given by subtracting k1 times the standard deviation σ from the average value Th-ave, and the cautionary value Th-hi is obtained by subtracting k times the standard deviation σ from the average value Th-ave.
It is given by adding twice.

As shown in FIG. 9, the peak area correction means (45) is configured to correct the start and end of the peak area when the safety value Th-lo is equal to or less than the flat value Th-flat. . In other words, the peak area correction means (45) performs a correction to reduce the predetermined value for recognizing that the area is in the peak area and to increase the peak width. In the correction of the start end of the peak region, when the safety value Th-lo is equal to or less than the flat value Th-flat, the detected torque is equal to or more than the safety value Th-lo and less than the cautionary value Th-hi. The value is compared with a value p times ahead of the detected torque value. And the detected torque value is p
The smallest detected rotation angle when the value is lower than the previous value is corrected to the beginning of the peak area. For example, if the detected torque value reaches the safety value Th-lo before reaching the flat Th-flat during the increase of the detected torque value and continues to increase thereafter, the detected rotation angle at which the safety value Th-lo is reached is reached. Is the beginning of the peak region. Here, p is an arbitrary value. By making the value of p larger than the value of n, which is one side width of the filtering process, it is possible to make the value less affected by minute fluctuations.

The correction of the end of the peak area is similarly performed. In other words, for each detected torque value that is equal to or greater than the safety value Th-lo and less than the cautionary value Th-hi, the detected torque value is compared with the value of the p-th point, and the detected torque value is the value of the p-th point. The largest detected rotation angle at a higher case is corrected to the end of the peak area. For example, as shown in FIG. 9, when the detected torque value falls below the flat value Th-flat and thereafter does not fall to the safe value Th-lo, and the descent ends, the detected rotation angle at which the descent is completed Is the end of the peak region. Further, when the detected torque value continues to decrease even after it has decreased below the safe value Th-lo, the detected rotation angle that has reached the safe value Th-lo is the end of the peak region. On the other hand, the detected torque value
At Th-hi or more, the end of the peak region is not reached even if the decrease in the detected torque value stops.

When a peak area including the detected rotation angle Ro and the detected rotation angle Rm-1 in the target circumference appears in the target circumference of a plurality of rotations, the waveform recognition unit (33) performs the processing on the peak area. A peak area is allocated to be included in the circumference, included in the previous circumference of the target circumference, or included in the next circumference of the target circumference, and is allocated to the peak area. 46).
In other words, the torque value is detected by performing a plurality of rotations, and the peak region is recognized based on the detected torque value from the detected rotation angle Ro to the detected rotation angle Rm-1 for each rotation. A peak region including the angle Ro or the detection rotation angle Rm-1 may appear. This detected rotation angle Ro or detected rotation angle Rm-1
Is recognized as a peak area also appearing in the previous or next circumference, and thus a peak area that appears due to the same cause is recognized as a separate peak area. Therefore, the peak area distribution means (4
6) recognizes that the peak region appears only in one of the rotations.

Specifically, the peak area distribution means (46)
As shown in FIG. 10 and FIG. 11, when there is a peak region including the detected rotation angle Ro on the target circumference, the detected torque value of the detected rotation angle Ro on the target circumference and the detected rotation angle Rm-1 on the front circumference are determined. Compare the detected torque value with the detected rotation angle.
Only when the detected torque value of Ro is higher, it is recognized that there is a peak area only on the target circumference. In this case, processing is performed so that the detected rotation angle Ro becomes the start end of the peak area in the target circumference. When a peak area including the detected rotation angle Rm-1 in the target circumference exists, the peak area distribution means (46) determines the detected torque value of the detected rotation angle Rm-1 in the target circumference and the detected rotation angle Ro in the next circumference. And when the detected torque value of the detected rotation angle Rm-1 is equal to or larger than the detected torque value of the detected rotation angle Ro in the next rotation, it is recognized that there is a peak region only in the target rotation. In this case, processing is performed so that the detected rotation angle Rm-1 is the end of the peak area in the target circumference.

For example, in FIG. 11 (a), the detected torque value of the detected rotation angle Ro on the target circumference is lower than the detected torque value of the detected rotation angle Rm-1 on the previous circumference, so that there is a peak area on the target circumference. Is not recognized. In this case, in the previous round,
It is recognized that there is a peak area, and the detected rotation angle in the front circumference
The point corresponding to Rm-1 is the end of the peak area. FIG.
In (b), since the detected torque value of the detected rotation angle Ro in the target circumference is the same value as the detected torque value of the detected rotation angle Rm-1 in the previous circumference, it is not recognized that the target circumference has a peak area. In FIG. 11C, since the detected torque value of the detected rotation angle Ro in the target circumference is higher than the detected torque value of the detected rotation angle Rm-1 in the previous circumference, it is recognized that the peak area exists only in the target circumference. In FIG. 11D, since the detected torque value of the detected rotation angle Rm-1 on the target circumference is lower than the detected torque value of the detected rotation angle Ro on the next circumference, it is not recognized that the target circumference has a peak area.

The waveform recognizing unit (33) performs the same processing when the peak area including the detected rotation angles Ro and Rm-1 exists in the target circumference as a result of correcting the peak area. Is configured to recognize the presence or absence of

If the adjacent peak areas overlap when the correction for expanding the peak width is performed, the waveform recognition section (33) recognizes the adjacent peak areas as one peak area. 47). For example, as shown in FIG. 12, when a plurality of peak areas are extracted in the target circumference, the peak area correcting means (45) corrects the start and end of each peak area so that the peak area is enlarged. . The start and end of the K-th peak area and the (K + 1) -th peak area are corrected. When the end of the K-th peak region has a detection rotation angle larger than the start of the (K + 1) -th peak region, the K-th peak region and the (K + 1) -th peak region are corrected by the peak-region integrating means (47). Is recognized as one peak region. The beginning of this peak region is the beginning of the K-th peak region before correction, and the end is the end of the (K + 1) -th peak region before correction.

The reproduction confirmation section (34) is configured to confirm the reproducibility of the extracted peak area. When there are a plurality of extracted peak regions, the reproduction check unit (34) is configured to select up to two peak regions in descending order of peak value for each rotation.

As shown in FIG. 13, the reproduction confirmation section (34) extracts the peak areas in the order of the last circle, one cycle before, two cycles before,..., And detects the peak area in each rotation from the detected rotation angle Ro. It is configured to extract peak areas in the order of the rotation angle Rm-1.

The reproduction confirmation section (34) has the same area confirmation means (48). The same area confirmation means (48)
The first peak area that appears in a certain rotation is recognized as the peak area of the first area. Also,
When the same region confirming means (48) has a peak region having a detected rotation angle overlapping a part of the detected rotation angle with respect to the first region in another rotation, the two peak values are compared, and this peak value is compared. When the magnitude ratio is within a predetermined range, this peak area is also recognized as the peak area of the first area.

The same region confirming means (48) recognizes the peak region as the peak region of the second region when a peak region of the detected rotation angle that does not overlap with the detected rotation angle with respect to the first region appears at all. When a peak region where the detected rotation angles overlap in another rotation appears, it is recognized and compared in the same manner as in the first region. That is, in the first and second regions, there are peak regions corresponding to the measured rotation speed at the maximum. If a peak region in which the detected rotation angles do not overlap in both the first region and the second region appears, this peak region is recognized as a non-periodic region peak region.

The reproduction confirming section (34) is configured to determine that there is no reproducibility in the first region or the second region when there is no peak region corresponding to the measured rotation speed. I have. For example, when three peak areas do not appear in the first area when the measurement is performed by rotating three times, it is determined that the first area has no reproducibility. Second
The determination is made in the same manner for the peak of the region.

The defect judging section (35) is configured to judge a defective portion in the torque waveform based on a waveform parameter including a peak width and a peak position. (36b), a foreign matter mixing determining unit (37), a peripheral surface determining unit (38a), a flat end surface determining unit (38b), a bush determining unit (39a), and a blade determining unit (39b).

The drive shaft determination section (36) is configured to determine, based on the detected torque value, that the crankshaft (52) is not properly fitted when the peak region does not appear. That is, the drive shaft determination unit (36) determines that the crankshaft (52) is not properly fitted when the peak region does not appear and the average value Th-ave of the detected torque values is equal to or greater than the predetermined value. The poor fitting of the crankshaft (52) is a fault in which the fitting between the crankshaft (52) and the cylinder head (56) is abnormal. In the case of poor fitting, the detected torque value increases regardless of the detected rotation angle. FIG. 14 shows an example of the torque waveform when there is no peak region.

The defect absence determination section (36b) is configured to determine that there is no failure when the peak area does not appear and the average value Th-ave of the detected torque values is less than a predetermined value.

The foreign matter intrusion judging section (37) is configured to judge that there is a foreign matter inferior when the reproduction confirmation section (34) does not confirm the reproduction of the peak area. That is, when the reproduction confirmation unit (34) determines that there is no reproducibility in both the first area and the second area, the foreign matter mixing determination unit (37) determines that foreign matter mixing is defective, It is configured to determine the defective position in the circumferential direction based on the peak position of the active region.

The peripheral surface judging section (38a) judges that the peripheral surface is defective when only the first region appears and the peak width is, for example, less than 30 °, and determines the peripheral direction based on the peak position. Is configured to derive a defective position with respect to.

The peripheral surface defect is a defect in which a part of the sliding surface between the cylinder body (53) and the roller (62) is abnormal. That is, the piston (60) swings while part of the inner peripheral surface (54) of the cylinder body (53) and part of the outer peripheral surface (64) of the roller (62) slide through the oil film. If a part of the sliding surface between the cylinder body (53) and the roller (62) is abnormal, a peak region having a small peak width appears. In addition, since a defective portion of the sliding surface is slid once in one rotation, one peak region appears for one rotation.

The flat end face determination section (38b) determines that the flat end face is defective when only the first region appears and the peak width is, for example, 30 ° or more, and determines the flat direction based on the peak position. Is configured to derive a defective position with respect to.

The flat end face defect is a defect in which a part of the sliding surface between the cylinder head (56) and the piston (60) is abnormal. That is, the piston (60) swings while a part of the inner end surface (57) of the cylinder head (56) and the two planes (61) of the piston (60) slidably contact with each other via the oil film. When a part of the sliding surface between the piston (56) and the piston (60) is abnormal, a peak region having a larger peak width than in the case of the peripheral surface defect appears. In addition, since a defective portion of the sliding surface is slid once in one rotation, one peak region appears for one rotation.

FIG. 15 shows an example of a torque waveform determined as a peripheral surface defect. FIGS. 16 and 17 show an example of a torque waveform determined as a flat end face defect.

The bush determination section (39a) is configured to determine whether the bush type condition is satisfied when the first area and the second area appear during one rotation. The bush determination section (39a) determines that the bush is defective when the bush type condition is satisfied. The bush defect is a defect in which the sliding surface between the cylinder body (53) and the bush (70) has an abnormality.

When the first region and the second region appear during one rotation, the blade determination section (39b) is configured to determine whether the blade type condition is satisfied. The blade determining unit (39b) determines that the blade is defective when the blade type condition is satisfied. Blade failure is failure in which the sliding surface between the blade (63) and the bush (70) has an abnormality.

That is, the position of the piston (60) at the top dead center,
That is, since the measurement is performed with the blade (63) most inserted into the bush (70) at 0 °, the bush (70) per unit rotation angle when the rotation angle is 0 ° and 180 °.
The movement of the blade (63) per unit rotation angle is the smallest, and the movement of the blade (63) in the retreating direction is the smallest, and the pressing of the bush (70) against the cylinder body (53) is reduced. When the rotation angles are 90 ° and 270 °, the movement of the bush (70) is temporarily stopped and reversed, while the movement of the blade (63) per unit rotation angle is maximized and the bush (70) Is pressed against the cylinder body (53). Therefore, 90 ° and 270
°, the detected torque value gradually increases, while the movement of the bush (70) stops and reverses to 90 ° and 270 °.
The detected torque value drops sharply at °. In the case of a blade failure, the detected torque value increases near 90 ° and 270 °, while the detected torque value decreases near 0 ° and 180 °.

The case where the above-mentioned bush type condition is satisfied is a case where all of the following conditions are satisfied, as shown in FIGS. The condition is that the width of the peak region is 80 for both the first region and the second region.
° or more. The condition is that the ratio of the peak values in both regions is 50% or more and 100% or less. That is, the ratio of the detected torque value with the smaller peak value to the detected torque value with the larger peak value is 50% or more.
The condition is that the peak position in the peak area is to the right. That is, in both regions, the ratio of the rotation angle difference between the start end and the peak position to the rotation angle difference between the start end and the end of the peak region is 0.8 or more. The condition is that the bottom position between the first region and the second region is to the left between both peak positions. That is, the peak position of the first region and the second position
The ratio of the rotation angle difference between the peak position in the first region and the bottom position in the valley region to the rotation angle difference from the peak position in the region is 0.
2 or less. The condition is that the bottom position on the right side of the second area is closer to the second peak. That is, the difference between the rotation angle difference between the peak position of the second region and the peak position of the first peak region that appears in the next rotation is the rotation angle between the peak position of the second region and the bottom position of the next valley region. The difference ratio is 0.2 or less.

The case where the blade type condition is satisfied is a case where all of the following conditions are satisfied. The condition is that the width of the peak region is 80 ° or more in both the first region and the second region. The condition is that the ratio of the peak values in both regions is 50% or more and 100% or less. That is, the ratio of the detected torque value with the smaller peak value to the detected torque value with the larger peak value is 50%.
That is all. The condition is that the peak position in the peak area is near the center. That is, in both regions, the ratio of the rotation angle difference between the start end of the peak region and the peak position to the rotation angle difference between the start end and the end of the peak region is 0.25 to 0.25.
Within the range of 0.75. The condition is that the bottom position between the first region and the second region is closer to the center between both peak positions. That is, the peak position of the first region and the second position
The ratio of the rotation angle difference between the peak position and the bottom position in the first region to the rotation angle difference from the peak position in the region is 0.25 to
Within the range of 0.75. The condition is that the bottom position on the right side of the second area is around 360 °. That is, the bottom position appearing next to the second region is within a range of 360 ° ± 30 °. The condition is that the peak position of the first region is within the range of 85 ° to 120 ° and the peak position of the second region is within the range of 265 ° to 300 °.

Incidentally, since the second region may exist due to a complex factor, when the bush type condition and the blade type condition are not satisfied, it is determined that there is another defect.

FIG. 21 shows an example of a torque waveform determined to be a bush failure, and FIG. 22 shows an example of a torque waveform determined to be a blade failure. The waveform shown in the figure is
The phase is shifted by about 30 °.
2) It is due to the twisting of itself.

The result display section (40) constitutes a result display means, and is configured to display the fault location determined by the fault determining section (35), the fault position in the circumferential direction, and the torque waveform. I have.

The circling determination section (41) constitutes circulating determining means for adjusting the measured rotational speed based on whether or not the torque waveform and the peak area are reproduced. That is, the orbit determination unit (41) is configured to increase or decrease the measured rotational speed based on the determination result of the defective portion based on the obtained torque waveform or whether or not the peak region is reproduced.

-Operating operation- First, the operation of measuring the load torque of the compressor inspection device (10) will be described. The compression mechanism (50) is placed on the work holder (12) of the inspection device (10), and the crankshaft (52) is inserted into the keyway (20) of the chuck (17). When the work support (12) is rotated by the drive motor (15), the cylinder (51) rotates together with the work support (12) while the crankshaft (5) rotates.
2) does not rotate because it is pinched by the keyway (20) of the chuck (17). As a result, the crankshaft (52) relatively rotates with respect to the cylinder (51).

At this time, the piston (6) of the compression mechanism (50)
0) swings while sliding on the cylinder (51) through the oil film of the refrigerating machine oil, the blade (63) moves forward and backward while sliding on the bush (70), and the bush (70) moves on the cylinder body (53). Swings while sliding on Then, the rotation angle detector (16) detects the rotation angle of the work support (12),
While outputting a detection signal to the controller (30), the torque detector (18) detects a torque value acting on the crankshaft (52) and outputs a detection signal to the controller (30).

In the controller (30), a detection signal is input, a torque waveform is derived, and a maximum value th-max, a minimum value Th-min, and an average value Th-ave of the detected torque value for each rotation are obtained.
And the standard deviation σ are derived and accumulated. Furthermore, the average value
The safety value Th-lo is obtained by subtracting k1 times the standard deviation σ from Th-ave.
Is derived, and k2 times the standard deviation σ is added to the average value Th-ave, and the cautionary value Th-hi is derived and accumulated.
Then, the measurement is completed when the work receiving table (12) rotates by the set number of rotations.

After the above measurement is completed, the controller (3
The control operation (0) will be described with reference to FIG. First, in step ST11, when the measurement is completed,
Proceeding to step ST12, the flat value of the detected torque value Th-fla
When t is input, the process moves to step ST13. Step ST13
Then, a peak region is extracted. That is, for each rotation, a peak area where the detected torque value exceeds the flat value Th-flat is extracted, and when the safety value Th-lo is equal to or less than the flat value Th-flat, the start and end of the peak area are corrected. When there is a peak area including the detected rotation angle Ro or the detected rotation angle Rm-1, whether or not the peak area is included in the target circumference is determined.

Then, the process proceeds to step ST14, where the presence or absence of a peak region is determined. If there is no peak region in all rotations, the process proceeds to step ST15, and the level of the detected torque value is determined. When the average value Th-ave of the detected torque values is equal to or larger than the predetermined value, the process proceeds to step ST16, and it is determined that the fitting of the crankshaft (52) is poor. On the other hand, when the average value Th-ave is less than the predetermined value, the process proceeds to step ST17. Proceed and determine that there is no defect.

On the other hand, when it is determined in step ST14 that a peak region has appeared, the process proceeds to step ST18 to check whether or not the reproducibility of the peak region exists. Specifically,
From the peak areas existing for each rotation, up to two peak areas are selected for each rotation in descending order of peak value. Then, in order of the last lap, the previous lap, and the second lap, confirmation is performed from the smaller one of the detected rotation angles, and the peak area that appears first is recognized as the peak area of the first area, When a non-overlapping peak region appears, this peak region is recognized as the peak region of the second region.

When a peak region having a detected rotation angle overlapping with a part of the detected rotation angle with respect to the first region appears in another rotation, the magnitude ratio of both peak values is compared, and the magnitude ratio is determined. When it is within the predetermined range, this peak area is also recognized as the peak area of the first area. The second region is similarly recognized. If a peak region in which the detected rotation angles do not overlap in both the first region and the second region appears, this peak region is recognized as the peak region of the non-periodic region. Then, the process proceeds to step ST19, where it is determined whether or not reproducibility exists for the first area and the second area. First
In any of the region and the second region, if there is no peak region corresponding to the set number of rotations, it is determined that there is no reproducibility, and the process proceeds to step ST20, where it is determined that there is a foreign matter mixing defect, and A defective position in the circumferential direction is derived based on the peak position of the non-periodic region.

On the other hand, if it is determined that there are peak regions corresponding to the set number of revolutions in the first region or the second region, the process proceeds from step ST19 to step ST21, and it is determined that there is reproducibility. The number of determined areas is determined. That is, it is determined whether the reproducibility exists in both the first area and the second area or in any one of them. And the number of areas is 1
If not, the process proceeds from step ST21 to step ST22, confirms the width of the peak region, and proceeds to step ST23. Steps
In ST23, it is determined whether or not the width of the peak region is less than 30 °. If the width of the peak region is less than 30 °, the process proceeds to Step ST24, where it is determined that the peripheral surface is defective, and the circumferential direction is determined from the peak position. The defect position for is derived. When the width of the peak region is 30 ° or more, the determination in step ST23 is NO, the process proceeds to step ST25, and it is determined that the flat end face is defective, and a defective position in the circumferential direction is derived from the peak position.

If the number of areas determined to have reproducibility is two in step ST21, the process proceeds to step ST26, and it is determined whether or not the bush type condition is satisfied. Specifically, the width of the peak region is 8 for both the first region and the second region.
0 ° or more (condition), the ratio of the peak values of both regions is 50% or more and 100% or less (condition), the peak position in the peak region is rightward (condition), and both regions The bottom position between the two peak areas is closer to the left (condition), and the bottom position on the right side of the second area is closer to the second peak (condition). It is determined whether the bush type condition is satisfied. Then, when the bush type condition is satisfied, the process proceeds to step ST27, and it is determined that the bush is defective.

If it is determined in step ST26 that the bush type condition is not satisfied, the process proceeds to step ST28.
To determine whether the blade type condition is satisfied.
Specifically, the width of the peak region is 80 ° or more in both the first region and the second region (condition), and the ratio of the peak values in both regions is 50% or more and 100% or less (condition). The peak position in the peak region is closer to the center (condition), the bottom position between both regions is closer to the center between both peak regions (condition), and the bottom position on the right side of the second region is near 360 °. (Condition), the peak position of the first region is in the range of 85 ° to 120 °, and the peak position of the second region is 265 ° to 30 °.
It is determined whether or not the blade type condition is satisfied, based on whether or not all the conditions of being within 0 ° (condition) are satisfied. When the blade type condition is satisfied, the process proceeds to step ST29, where it is determined that the blade is defective.
If it is determined in step ST28 that the blade type condition is not satisfied, the process proceeds to step ST30, where it is determined that the other defect.

Then, the process proceeds to a step ST31, wherein the steps ST16, ST17, ST20, ST24,
The defective portion, defective position, and torque waveform determined in steps ST25, ST27, ST29, and ST30 are displayed on the result display section (40), and in step ST32, the measurement rotational speed for the next measurement is determined.

-Effects of Embodiment- According to the present embodiment, in the inspection device for the compression mechanism (50) in the oscillating piston compressor, the defective portion is determined based on the waveform parameters including the peak width and the peak position. Because of this, it is possible to determine even the details of the defect. As a result, even an unskilled inspector can easily find a defective portion and improve the inspection efficiency.

When one peak region appears during one rotation, it is possible to reliably determine that the peripheral surface is defective or the flat end surface is defective. Further, a defective position in the circumferential direction can be derived based on the peak position.

Further, when two peak areas appear during one rotation, it is possible to reliably determine a bush defect or a blade defect.

Further, when there is no peak region, it is possible to reliably determine a poor fitting of the drive shaft (52) whose detected torque increases regardless of the detected rotation angle.

Further, it is possible to reliably determine that there is no defect.

In addition, it is possible to reliably determine a foreign matter mixture defect in which the peak area is not reproduced every rotation.

Further, since the detected torque is averaged for each predetermined rotation range, the influence of disturbance due to a measurement error or the like can be suppressed, and the determination accuracy can be improved.

Further, since the predetermined value for determining the peak area is determined based on the value given by the inspector, for example, the predetermined value can be changed with reference to the torque waveform. The region can be determined.

Further, since the predetermined value for determining the peak area is adjusted using the standard deviation indicating the variation of the detected torque, the predetermined value obtained based on the value given by the inspector is automatically adjusted. Can be modified. Therefore, the peak region can be appropriately corrected, and the accuracy of determining the peak region can be improved.

Further, it is possible to prevent a peak region that appears due to the same cause of failure from being recognized as a separate peak region.

In addition, it is possible to reliably determine whether or not a peak area has appeared due to the same cause of failure.

Further, since the defective part is displayed, the inspector can immediately know the defective part, and the inspection efficiency can be further improved.

Further, the rotation speed can be adjusted to an appropriate value.

<Other Embodiments of the Invention> In the above embodiment, the apparatus main body (11) fixes the cylinder (51) and rotates the crankshaft (52) to rotate the cylinder (51) and the crankshaft ( 52).

Further, the rotation angle detector (16) may be provided with a timer instead of the rotary encoder, and may derive the rotation angle based on the measurement time. The rotation angle detector (16) is replaced by a cylinder (51) instead of a work positioning pin.
A configuration may be employed in which a sensor for recognizing the shape of the cylinder is provided, and the absolute position of the cylinder (51) or the like is derived from the detection value of the sensor.

Further, the rotation determining section (41) may be omitted, and the measurement rotation speed may be fixed to a plurality of rotations of two or more. Further, a configuration may be adopted in which the measurement rotation speed can be set arbitrarily.

The defect judging section (35) includes a drive axis judging section (36a), a defect absence judging section (36b), and a foreign matter mixing judging section (3
7) The configuration may be such that any one of the peripheral surface determining unit (38a), the flat end surface determining unit (38b), the bush determining unit (39a), and the blade determining unit (39) is omitted.

Further, the waveform input section (31) may be configured to omit the averaging means (32).

The waveform recognition section (33) omits any of the level input means (44), the peak area correction means (45), the peak area distribution means (46), and the peak area integration means (47). The configuration may be such that:

Further, the reproduction confirmation section (34) may be configured to omit the same area confirmation means (48).

Further, the configuration may be such that the result display section (40) is omitted.

[Brief description of the drawings]

FIG. 1 is an overall view showing a configuration of a compression mechanism inspection apparatus according to an embodiment.

FIG. 2 is a configuration diagram illustrating a configuration of a compression mechanism.

FIG. 3 is a top view showing a configuration of a cylinder body in which a piston is arranged.

FIG. 4 is a perspective view showing a bush, a piston, and a crankshaft.

FIG. 5 is a characteristic diagram illustrating a filtering process.

FIG. 6 is a characteristic diagram illustrating a filtering process.

FIG. 7 is a characteristic diagram showing a flat value of a detected torque value in a torque waveform.

FIG. 8 is a characteristic diagram showing a peak region in a torque waveform.

FIG. 9 is a characteristic diagram showing a peak region in a torque waveform.

FIG. 10 is a characteristic diagram showing distribution of a front, a target, or a next circumference in a torque waveform.

FIG. 11 is a characteristic diagram showing distribution of a front, a target, or a next circumference in a torque waveform.

FIG. 12 is a characteristic diagram illustrating correction of a peak region in a torque waveform.

FIG. 13 is a characteristic diagram showing recognition of a first region or a second region in a torque waveform.

FIG. 14 is a characteristic diagram illustrating an example of a torque waveform when there is no peak region.

FIG. 15 is a characteristic diagram illustrating an example of a torque waveform when it is determined that the peripheral surface is defective.

FIG. 16 is a characteristic diagram showing an example of a torque waveform when it is determined that the flat end face is defective.

FIG. 17 is a characteristic diagram showing an example of a torque waveform when it is determined that the flat end face is defective.

FIG. 18 is a diagram showing a table of bush type conditions and blade type conditions.

FIG. 19 is a characteristic diagram illustrating determination of a bush type condition in a torque waveform.

FIG. 20 is a characteristic diagram illustrating determination of blade type conditions in a torque waveform.

FIG. 21 is a characteristic diagram illustrating an example of a torque waveform when a bush defect is determined.

FIG. 22 is a characteristic diagram illustrating an example of a torque waveform when it is determined that a blade is defective.

FIG. 23 is a flowchart showing a control operation in the compression mechanism inspection device according to the present embodiment.

[Explanation of symbols]

 (16) Rotation angle detector (18) Torque detector (22) Rotation means (32) Averaging means (34) Reproduction confirmation section (35) Failure determination section (36a) Drive axis determination section (36b) No failure determination section (37) Foreign matter mixing judgment part (38a) Peripheral surface judgment part (38b) Flat end face judgment part (39a) Bush judgment part (39b) Blade judgment part (40) Result display part (41) Circuit determining part (43) Waveform derivation Means (44) Level input means (45) Peak area correction means (46) Peak area distribution means (47) Peak area integration means (48) Same area confirmation means (50) Compression mechanism (51) Cylinder (52) Crank shaft ( 53) Cylinder body (56) Cylinder head (60) Piston (63) Blade (70) Bush

Claims (16)

[Claims] An apparatus for testing a compression mechanism in an oscillating piston compressor comprising a cylinder (51) and a piston (60) slidably provided, wherein the cylinder (51) and a compression mechanism (50) are provided. Rotating means (22) for relatively rotating the drive shaft (52) of the cylinder, the cylinder (51) and the drive shaft (52) by the rotating means (22)
A rotation angle detection means (16) for detecting a relative rotation angle between the rotation means, a torque detection means (18) for detecting a torque acting on the drive shaft (52) during a relative rotation by the rotation means (22), A waveform deriving means (43) for deriving a torque waveform indicating a change in the detected torque of the torque detecting means (18) with respect to the detected rotation angle of the angle detecting means (16); A determination unit (3) for determining a defective portion based on a waveform parameter including a peak width which is a width of a peak region in which the torque fluctuates beyond a predetermined value and a peak position in the peak region.
5) An inspection device for a compression mechanism, comprising: 2. The cylinder (51) according to claim 1, wherein the cylinder (51) includes a cylinder body (53) and cylinder heads (56) at both ends of the cylinder body (53). If one peak region appears during one rotation of the relative rotation between the drive shaft (51) and the drive shaft (52) and the peak width is less than a predetermined value, the sliding between the cylinder body (53) and the piston (60) occurs. An inspection device for a compression mechanism, comprising: a peripheral surface determination unit (38a) that determines a peripheral surface defect as a moving surface abnormality and derives a defective position. 3. The cylinder (51) according to claim 1, wherein the cylinder (51) includes a cylinder body (53) and cylinder heads (56) at both ends of the cylinder body (53). If one peak area appears during one rotation of the relative rotation between the drive shaft (51) and the drive shaft (52), and the peak width is equal to or larger than a predetermined value, the cylinder head (56)
An inspection apparatus for a compression mechanism, comprising: a flat end face determination section (38b) for determining a flat end face failure, which is an abnormal sliding surface between the piston and the piston (60), and deriving a defective position. 4. The cylinder (51) according to claim 1, wherein the cylinder (51) includes a cylinder body (53) and cylinder heads (56) at both ends of the cylinder body (53). ) And blade (6
3), the blade (63) is fitted to the cylinder body (53) via the bush (70), while the determining means (30) is configured to determine the connection between the cylinder (51) and the drive shaft (52). During one rotation of the relative rotation, the first peak region and the second peak region appear, the peak width of both peak regions is equal to or more than a predetermined value, and the ratio of the peak values of both peak regions is within a predetermined range, The peak position of each peak region is biased toward the leading side of the detected rotation angle, the bottom position of the detected torque between both peak regions is biased toward the first peak region, and the second peak region and the next rotational position during the next rotation are shifted. If the bottom position between the first peak area and the second peak area is biased toward the second peak area, a bush determination unit (39a) that determines that the bush is defective due to an abnormal sliding surface between the cylinder body (53) and the bush (70). An inspection device for a compression mechanism, comprising: 5. The cylinder (51) according to claim 1, wherein the cylinder (51) includes a cylinder body (53) and cylinder heads (56) at both ends of the cylinder body (53). ) And blade (6
3), the blade (63) is fitted to the cylinder body (53) via the bush (70), while the determining means (30) is configured to determine the connection between the cylinder (51) and the drive shaft (52). During one rotation of the relative rotation, the first peak region and the second peak region appear, the peak width of both peak regions is equal to or more than a predetermined value, and the ratio of the peak values of both peak regions is within a predetermined range, The peak position of each peak region is located near the center of each peak region, the bottom position of the detected torque between both peak regions is located near the center between both peak regions, and the second peak region and the next rotation If the bottom position between the first peak region and the peak position of each peak region is within the predetermined range, the sliding surface between the blade (63) and the bush (70) is abnormal. Equipped with a blade determination unit (39b) that determines that the blade is defective. Inspection device of the compression mechanism, characterized in that there. 6. The drive shaft determination unit according to claim 1, wherein the determination unit determines that the drive shaft is not properly fitted when the peak region does not appear and the detected torque is equal to or greater than a predetermined value. An inspection device for a compression mechanism, comprising a part (36a). 7. The defect determination unit (36b) according to claim 1, wherein the drive shaft determination unit (36) determines that there is no failure if the peak area does not appear and the detected torque is less than a predetermined value. An inspection device for a compression mechanism, comprising: 8. The method according to claim 1, wherein the judging means includes a foreign matter intrusion judging unit for judging a foreign matter inferiority when the peak area is not reproduced for each rotation. Inspection device for compression mechanism. 9. The inspection apparatus for a compression mechanism according to claim 1, further comprising an averaging means (32) for averaging the detected torque of the torque detection means (18) for each predetermined rotation range. 10. A method according to claim 1, wherein a predetermined value for recognizing that the torque detected by the torque detecting means (18) is in a peak region is obtained by adding a value given by an inspector and a minimum value of the detected torque. An inspection apparatus for a compression mechanism, comprising: a level input means (44) for inputting data. 11. The peak area correction according to claim 1, wherein a predetermined value for recognizing a peak area is adjusted by using a standard deviation indicating a variation in torque detected by the torque detecting means, and a peak width is corrected. Means (4
5) An inspection device for a compression mechanism, comprising: 12. The method according to claim 11, wherein when the peak area correcting means (45) performs the correction for expanding the peak width, if adjacent peak areas overlap, the adjacent peak areas are recognized as one peak area. An inspection apparatus for a compression mechanism, comprising: a peak region integrating means (47) for performing compression. 13. The method according to claim 1, further comprising a peak area distribution unit (46) for recognizing that when a peak area extending over two rotations appears, the peak area appears only in one of the rotations. Inspection device for compression mechanism. 14. An identical region confirming means (48) according to claim 1, wherein when a peak region appears in two or more rotations, the same region confirming means (48) for judging whether or not the peak region is the same region based on the detected rotation angle and the peak value. Inspection apparatus for a compression mechanism. 15. The compression mechanism inspection apparatus according to claim 1, further comprising a result display means (40) for displaying a defective portion determined by the determination means (35). 16. The method according to claim 1, further comprising: a circling determining unit (41) that adjusts a measured rotation speed based on the torque waveform derived by the waveform deriving unit (43) and whether or not a peak region is reproduced. Inspecting device for compression mechanism.