CN202928479U - Dimension measuring device - Google Patents

Abstract

The utility model discloses a dimension measuring device. The dimension measuring device comprises a standard comparison device for setting the initial standard dimension of the dimension measuring device, and a micro-difference comparison device for detecting the dimension difference between the actual dimension and the initial standard dimension, wherein the micro-difference comparison device comprises a transverse beam which is horizontally arranged; two cantilevers vertically mounted on the transverse beam, wherein at least one cantilever horizontally slides along the transverse beam and is locked on the transverse beam; two opposite measuring heads respectively connected with the cantilevers, wherein one measuring head slides relative to the cantilever; a measuring instrument in the fixed relative position relationship with the cantilevers and connected with the measuring head capable of sliding relative to the cantilever. The dimension measuring device uses the comparison principle to accurately measure the large-dimension component.

Description

Dimension measuring device

technical field

The utility model relates to the field of size measurement, in particular to a size measurement device for measuring the size of parts. the

Background technique

On some large-scale mechanical equipment, it is often necessary to measure large-sized parts, and the requirements for measurement accuracy are high. For example, large rotating disks, fixed shaft cylinders or bearings installed in wind turbines, the accuracy of dimensional measurement of these key large-scale components directly affects the service life and reliability of the assembled bearings of the entire wind turbine. Therefore, it is very important to ensure the accuracy of dimensional measurement of these critical large-scale components. the

At present, there are two commonly used detection methods. One is to use general measuring tools for direct measurement, such as using inner and outer diameter micrometers. However, due to the large measurement depth and size of the above-mentioned components in the wind turbine, and the high precision requirements, it may take 3 to 5 measurement personnel to complete the measurement with this method, resulting in high labor costs. At the same time, for parts with a measurement size greater than 3m, there is no micrometer of the corresponding specification that can be used for testing, resulting in a small measurement range and failing to meet the measurement accuracy requirements. the

The other is to use an imported measuring device for detection. The measuring device has a high detection accuracy, but this measuring device requires a matching large-scale length measuring machine. The cost of the length measuring machine is relatively high, about 1.2 million, making the measurement The cost is high; in addition, the measuring device is made of carbon fiber material, which needs to be measured under constant temperature conditions, and the temperature compensation calculation for the measurement results is relatively complicated; the measuring depth of the measuring device is limited, and it is difficult for some special Hole and shaft diameters cannot be measured. the

Therefore, it is necessary to provide a novel size measuring device to improve the measurement accuracy and expand the measurement range so as to accurately measure the size of large-sized components. the

Utility model content

Other aspects and/or advantages of the general concept of the present utility model will be partially set forth in the following description, and some of them will be clear from the description, or can be known through the implementation of the general concept of the present utility model. the

The object of the present invention is to provide a dimension measuring device, which has high measurement accuracy and wide measurement range, and can realize accurate measurement of large-sized components. the

Another object of the present invention is to provide a dimension measuring device capable of accurately measuring parts having a deep bore inner diameter or a long outer diameter. the

In order to achieve the above object, the utility model provides a size measuring device, the size measuring device includes a standard calibration device for setting the initial standard size of the size measuring device and a device for detecting the actual size and the initial standard size The differential comparison device of the size difference, wherein, the differential comparison device includes:

beams arranged horizontally;

two cantilever arms, the cantilever arms are vertically mounted on the cross beam, at least one cantilever arm can slide horizontally along the cross beam and can be locked on the cross beam;

Two measuring heads arranged oppositely, the measuring heads are respectively connected to the two cantilevers, and one of the measuring heads can slide relative to the cantilever;

A measuring instrument, the relative positional relationship between the measuring instrument and the cantilever is fixed, and is connected with a measuring head that can slide relative to the cantilever. the

Preferably, the standard alignment device sets an initial standard size through a horizontally arranged gauge block assembly. the

Preferably, the gauge block assembly is placed horizontally on the bottom plate. the

Preferably, the measuring instrument includes a dial indicator or a dial gauge. the

Preferably, the micro-difference comparison device accurately sets the initial standard size through the support block arranged under the beam. the

Preferably, a through groove matching with the gauge block assembly is provided at the bottom of the support block, and the support block is placed directly on both sides of the gauge block assembly. the

Preferably, sliders are respectively connected to the side walls of the two cantilevers, and a second locking device is provided between the two sliders and the corresponding cantilever, so as to selectively lock the sliders fixed to the cantilever. the

Preferably, a first locking device is provided between the cantilever and the beam to selectively fix the cantilever and the beam. the

Preferably, the first locking device includes a cam lever and a rotating shaft disposed inside the cantilever, and a cam on the cam lever is pivotally connected to the rotating shaft and can rotate to realize locking and releasing of the cantilever. the

Preferably, the cantilever includes a hanger connected to the beam and an arm fixedly connected below the hanger, and the first locking device is arranged between the hanger and the beam. the

Preferably, a vertically extending guide groove is provided on the side wall of the arm connected with the slider, and the second locking device includes a fastening bolt and an auxiliary block arranged in the guide groove , A threaded groove is provided on the auxiliary block, and the fastening bolt crosses the slider and interferes in the threaded groove. the

Preferably, two support rods extending horizontally are inserted horizontally at the bottom of the slider. the

Preferably, an auxiliary sleeve is provided between the two measuring heads and the cantilever, and the auxiliary sleeve is fixedly connected to the cantilever; the measuring instrument is arranged on the auxiliary sleeve. the

When using the size measuring device provided by the utility model to measure the size of the measured part, first set the initial standard size of the size measuring device according to the standard design size of the measured part, by adjusting the distance between the two cantilevers The distance between the two measuring heads is the standard design dimension; the measuring instrument is reset to zero; The measuring heads are respectively placed in the appropriate measurement direction of the measured part, and the position of the measuring head connected with the measuring instrument is adjusted so that the two measuring heads are in contact with both sides of the measured part; record the measuring instrument The reading is the difference between the actual size of the tested part and the initial standard size, and finally the deviation is added or subtracted to the standard design size of the tested part, and the final result is the actual precise size of the tested part . the

The size measuring device provided by the utility model adopts the comparison principle to complete the measurement. By setting the initial standard size, that is, the standard design size of the measured part, the two measuring heads and the measuring instrument are used to detect the two The size difference between the actual size of the measured part and the standard design size can be obtained by the variation of the distance between the measuring heads, and then the actual accurate size of the measured part can be obtained; the measurement accuracy of the size measuring device is high, and the Under the condition of selecting a suitable measurement range, it can realize high-precision measurement of the inner and outer diameters of various large-sized parts. Moreover, the measurement depth of the size measuring device can be adjusted by setting the position of the slider, so that the size measuring device according to the present invention can measure the size of a relatively deep aperture. the

Description of drawings

These and/or other aspects and advantages of the present utility model will become clear and easier to understand by describing the embodiments below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic structural view of a size measuring device according to an embodiment of the present utility model;

Fig. 2 is a schematic front view of the cantilever shown in Fig. 1 assembled with the slider;

Fig. 3 is a schematic side view of the cantilever and slider shown in Fig. 2 assembled together;

Fig. 4 is the schematic front view of the pendant of the dimension measuring device shown in Fig. 1;

Fig. 5 is a schematic side view of the pendant of the dimension measuring device shown in Fig. 4;

Fig. 6 is the schematic front view of the arm member of the size measuring device shown in Fig. 1;

Fig. 7 is a schematic side view of the arm of the dimension measuring device shown in Fig. 6;

Fig. 8 is a schematic top view of the arm of the dimension measuring device shown in Fig. 6;

Fig. 9 is a schematic side view of the slider of the dimension measuring device shown in Fig. 1;

Fig. 10 is a top view schematic diagram of the slider of the dimension measuring device shown in Fig. 9;

FIG. 11 is a schematic diagram of the measuring state of the dimension measuring device shown in FIG. 1 . the

Detailed ways

Embodiments of the invention will now be described in detail, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures. the

The utility model provides a size measuring device, which can realize accurate measurement of large-sized components and has a wide measurement range. the

Please refer to FIG. 1 , which is a schematic structural diagram of a dimension measuring device according to an embodiment of the present invention. the

In one embodiment, the size measuring device provided by the utility model includes a standard alignment device for setting the initial standard size of the size measuring device and a micrometer for detecting the difference between the actual size and the initial standard size. For the differential comparison device, the size of the initial standard size mentioned here may be the same as the size of the standard design size of the tested component 23 . the

The standard alignment device can set the initial standard size through the gauge block assembly 3 with high dimensional accuracy. The gauge block assembly 3 can be selected according to the standard design size of the tested component 23 (see FIG. 11 ), that is to say, the length of the gauge block assembly 3 is preferably consistent with the standard design size. The gauge block assembly 3 includes at least one gauge block, that is, the gauge block assembly 3 can be composed of multiple gauge blocks to meet the requirements of the size measuring device for the measurement range. the

In order to place the gauge block assembly 3 more accurately and horizontally, a base plate 1 can be further provided below it, the top surface of the base plate 1 is a plane parallel to the ground, and the gauge block assembly 3 is directly placed on the top surface. the

The micro-difference comparison device includes a horizontal beam 8 on which two cantilevers are vertically connected, and at least one cantilever can slide horizontally along the beam 8 . Preferably, both cantilevers can be made to slide horizontally. Between at least one cantilever and the beam 8 a first locking device is provided for selectively fastening the cantilever to the beam 8 . The selectivity mentioned here means that when the first locking device is in the locked state, the relative positional relationship between the cantilever and the beam 8 is fixed, and when the first locking device is in the unlocked state, the cantilever can move along the The crossbeam 8 slides horizontally, and the fixed relationship between the two is released. Furthermore, when the cantilever moves to a suitable position consistent with the initial standard size on the horizontal beam 8, the first locking device can be manipulated so as to fix the relative positional relationship between the cantilever and the beam 8; when the cantilever needs to be moved again , the cantilever can be moved again only by manipulating the first locking device again to release the fixed connection relationship between the cantilever and the beam 8 . the

Specifically, the first locking device may include a cam lever 7 and a rotating shaft arranged inside the cantilever, a cam is formed at one end of the cam lever 7, and a rod is formed at the other end, the cam is pivotally connected to the rotating shaft, and the cam is arranged between the cantilever and the Between the beams 8, the rod body of the cam rod 7 is located outside the cantilever to facilitate the control of the rotation of the cam. When the protrusion of the cam collides with the crossbeam 8, the cantilever is stuck on the crossbeam 8, and then the positional relationship between the cantilever and the crossbeam 8 is fixed. When the cam lever 7 is rotated at a certain angle so that the protrusion of the cam deviates from the crossbeam 8, the fixed connection between the cantilever and the crossbeam 8 is released, and the cantilever can slide along the crossbeam 8 at this time. the

A measuring head 4 is installed at the lower end of each cantilever. When setting the initial standard size of the size measuring device, the distance between the two measuring heads 4 represents the initial standard size. the

As shown in Figures 2 and 3, the cantilever can further include a pendant 9 directly suspended on the crossbeam 8, and an arm 6 fixedly connected to the pendant 9, which can be fixedly connected by fastening bolts; the first lock A tightening device can be arranged between the beam 8 and at least one hanger 9 . the

Please refer to Fig. 4 and Fig. 5, the opening of the pendant 9 is downward, that is, there is a hanging groove 14 adapted to the structure of the beam 8 at the middle and lower part of the pendant 9, through which the pendant 9 can be directly hung on the beam 8 . A notch 15 for placing the arm 6 further extends below the hanging slot 14 , and the arm 6 is installed in the notch 15 . A first through hole 13 is laterally opened on both sides of the notch 15 to facilitate the fixed connection of the hanging part 9 and the arm part 6 by fastening bolts. Please refer to FIG. 6 and FIG. 7 , the arm member 6 is arranged vertically, and its top end is installed in the notch 15 . Correspondingly, a second through hole 16 matched with the first through hole 13 is opened on the top of the arm member 6 . the

The micro-difference comparison device further includes two sliders 10, and the two sliders 10 are respectively arranged on the vertical side walls of the two cantilevers. During measurement, the slider 10 is placed on the measured component 23 to support the differential comparison device, and the slider 10 can slide up and down relative to the cantilever, so as to adjust the dimension measuring device to adapt to different measurement depths. The vertical distance between the slide block 10 and the corresponding measuring head 4 is the measurement depth. When measuring, the two slide blocks 10 are preferably on the same plane to ensure that the measurement depth of the two measurement heads 4 is the same. As shown in Figures 9 and 10, a groove 20 is provided on the side wall of the slider 10 facing the cantilever, and the width of the groove 20 can be substantially consistent with the width of the cantilever, so that the slider 10 can be installed on the arm 6 on the side wall, and can slide up and down along the cantilever. However, the present invention is not limited thereto, and the slider 10 can slide on the cantilever through various ways such as guide rails and guide posts. In addition, two support grooves 19 cooperating with the support rod 12 can also be opened at the bottom of the slider 10 to better support the differential comparison device during measurement, thereby ensuring the accuracy of the measurement. Since the support rod 12 protrudes, the slide block 10 can interfere with the end faces of parts of different shapes, which expands the scope of use of the dimension measuring device. the

In order to realize that the slider 10 slides freely and stops along the cantilever, a second locking device is provided between the two sliders 10 and the cantilever, so as to selectively fix the slider 10 and the cantilever, by adjusting the slider 10 and the corresponding cantilever The relative positional relationship between them can realize the adjustment of the measurement depth, and at the same time, it can also ensure that the measurement depths of the two measurement heads 4 are the same. When adjusting the measurement depth, first move the two sliders 10 to appropriate positions, at this time, the vertical distance between the slider 10 and the corresponding measurement head 4 is the required measurement depth, and each measurement head The measurement depth of 4 is the same; operate the second locking device again to fix the relative positional relationship between the slider 10 and the corresponding cantilever; if it is necessary to readjust the measurement depth, just re-operate the second locking device to release the slider 10 and the cantilever, the slider 10 can be moved again to adjust the measurement depth. the

Specifically, two slide blocks 10 are arranged on the arm member 6 respectively, like this, offer the guide slot 18 that extends vertically on the side wall of arm member 6, and the second locking device comprises the bolt that runs through slide block 10 transversely 11 and the auxiliary block (not shown in the figure) arranged in the guide groove 18; that is, the through hole 21 matched with the bolt 11 is opened on the slider 10, and the threaded groove matched with the bolt 11 is provided on the auxiliary block , The top end of the bolt 11 is in contact with the threaded groove. In order to prevent the auxiliary block from slipping out of the guide groove 18, the guide groove 18 can be a dovetail groove, etc. slightly larger. When locking, the bolt 11 only needs to be tightened, and the auxiliary block firmly abuts against the innermost groove wall of the guide groove 18, so that the slider 10 can be locked on the arm member 6. the

In addition, in order to achieve more accurate measurement, the differential comparison device can also use the support block 2 arranged under the beam 8 when setting the initial standard size. The crossbeam 8 can be placed directly on the support block 2; two sliders 10 can also be placed on the support block 2 to realize the support of the differential comparison device, and then accurately ensure that the two measuring heads 4 are setting the initial standard dimensions are on the same level. In addition, grooves matching the gauge block assembly 3 may also be provided at the bottom of the support block 2 , and the support block 2 is directly placed on both sides of the gauge block assembly 3 . the

Furthermore, a support block 2 may be provided on which the two sliders 10 are placed, but this way will make the size of the support block 2 relatively large and cause waste of materials. Therefore, the support block 2 can also be directly placed on the gauge block assembly 3, which also contributes to the precise setting of the initial standard size. Specifically, two support blocks 2 can be set, a slide block 10 is respectively placed on each support block 2, and the two support blocks are placed on the two ends of the gauge block assembly 3 respectively, so that each support block 10 can be The size design is relatively small, and it is more flexible to use. the

Measuring heads 4 are connected under the two cantilevers, and one of the measuring heads 4 can slide relative to the cantilever. Before the measurement, the set distance between the two measuring heads 4 is the initial standard size, for example, The setting of the initial standard size can be realized at the two ends of the gauge block assembly 3 through the horizontal interference of the two measuring heads 4 ; during measurement, the two measuring heads 4 are in contact with both sides of the measured component 23 . In addition, the measuring head 4 can be further connected on the arm part 6, and the bottom of the arm part 6 is provided with a mounting hole 17, and the measuring head 4 is connected on the arm part 6 through the mounting hole 17; the size of the mounting hole 17 is the same as that of the measuring head 4 size fits. the

A measuring instrument 5 is connected to the measuring head 4 that can slide relative to the cantilever, and the measuring instrument 5 is fixed relative to the cantilever, that is to say, the measuring instrument 5 can slide relative to the measuring head 4 . the

Specifically, an auxiliary sleeve can be provided between the two measuring heads 4 and the cantilever, the measuring head 4 is nested inside the auxiliary sleeve, the auxiliary sleeve and the cantilever are fixedly connected, and fastening holes can be provided at the bottom of the cantilever 22. Use fastening screws to clamp the auxiliary sleeve in the fastening hole 22. In addition, one of the measuring heads 4 is fixedly connected with the auxiliary sleeve; the other measuring head 4 can slide relative to the auxiliary sleeve, and the measuring instrument 5 can be fixedly connected to the auxiliary sleeve and connected with the measuring head 4 at the same time, so as to use the measuring instrument 5 The sliding distance of the measuring head 4 is detected. the

The measuring instrument 5 has many specific forms, such as a dial indicator and a dial gauge. According to the requirements for measuring accuracy, a measuring instrument 5 with suitable measuring accuracy can be selected. the

According to the above-mentioned description of the utility model, when utilizing the size measuring device to measure the size of the measured part 23, taking the measurement of the outer diameter as an example, the following steps will generally be carried out:

(1) Set the initial standard size of the size measuring device according to the standard design size of the component under test 23 . the

Specifically, step (1) further includes:

(1-1) By selecting a gauge block assembly 3 with a suitable measurement range and placing it horizontally, and placing the gauge block assembly 3 horizontally, multiple gauge blocks with a small measurement range can be selected to form a gauge block assembly 3, so that the gauge block group The length of the piece 3 is the standard design dimension of the tested component 23 or is basically close to it. the

(1-2) Place the support block 2 above the gauge block assembly 3;

(1-3) Place the slider 10 of the differential comparison device on the support block 2, operate the first locking device, release the relative positional relationship between the crossbeam 8 and the cantilever, and make the two cantilevers at the gauge block assembly 3 both sides of

(1-4) Operate the second locking device to release the fixed positional relationship between the slider 10 and the corresponding cantilever, and adjust the relative position between the two cantilevers and the corresponding slider 10 so that the beam 8 is placed horizontally, A vertical setup with two cantilevers in parallel;

(1-5) Adjust the relative position between the two measuring heads 4 by adjusting the position of the cantilever, so that the two measuring heads 4 are in contact with the two ends of the gauge block assembly 3, so that the distance between the two measuring heads 4 It is the standard design size of the component under test 23, that is, the initial standard size of the size measuring device. the

(1-6) Lock the first locking device and the second locking device. the

Among them, the steps (1-2) to (1-5) do not have to be carried out sequentially, but can also be carried out at the same time, as long as the horizontal distance between the two measuring heads 4 can be guaranteed to be the standard design size of the measured component 23 . the

(2) Return the measuring instrument 5 to zero. the

(3) Place the differential comparison device on the tested part 23, and make the direction of the two measuring heads 4 roughly in the measuring direction of the tested part 23, that is, make the two measuring heads 4 approximately in the measured direction In the diameter direction of the measured part 23 or other dimensions to be measured. the

(4) Adjust the position of the slider to set the micro-difference comparison device to correspond to the predetermined measurement depth, and then fine-tune the position of the two measuring heads 4 along the circumferential direction of the measured part 23 as shown in the schematic diagram of the measurement state in Figure 11 so that the connection direction of the two measuring heads 4 is located in the diameter direction of the measured part 23, and finally manually or automatically adjust the sliding measuring head 4 to the best measuring position, so that the measuring direction is the diameter of the measured part direction. the

(5) Record the reading of the measuring instrument 5 at this time. the

At this time, the reading on the measuring instrument 5 is the difference between the actual size of the measured component 23 and the standard design size. Furthermore, if the display result of the measuring instrument 5 is that the size of the measured part 23 is smaller than the standard design size, then the actual precise size of the measured part 23 is the difference between the standard design size and the above-mentioned difference; if the display of the measuring instrument 5 The result is that the size of the tested component 23 is larger than the standard design size, then the actual precise size of the tested component 23 is the sum of the standard design size and the above-mentioned difference. the

When using the size measuring device provided by the utility model to measure the inner diameter, it is only necessary to disassemble the cantilever and the corresponding measuring head 4 from the beam 8, and after turning it over 180°, reinstall it on the beam 8, so that the two The measuring head 4 just needs to face outwards. the

The size measuring device provided by the utility model realizes the accurate measurement of the size of large-sized components, after determining the standard design size of the measured part 23, by measuring the difference between the actual size of the measured part 23 and the standard design size , to obtain the actual precise size of the measured component 23 . In addition, different measurement ranges can be selected through the combination of gauge blocks, which significantly increases the measurement range of the size measuring device, and can realize high-precision measurement of the inner and outer diameters of various large-sized components. Moreover, the measurement depth of the dimension measuring device can be adjusted by setting the position of the slider 10 , so that the dimension measuring device according to the present invention can measure a relatively deep aperture dimension. the

The size measuring device provided by the utility model has been described in detail above. Although some embodiments of the utility model have been shown and described, those skilled in the art should understand that without departing from the scope of the utility model as defined by the claims and their equivalents Under the condition of the principle and spirit of the utility model within the scope, these embodiments can be modified and improved, and these modifications and improvements should also be within the protection scope of the utility model. the

Claims (13)

1. a dimension measuring device, is characterized in that, comprise be used to the standard of the primary standard size of setting described dimension measuring device to meter apparatus and for detection of the elementary errors comparison device of the difference in size of physical size and primary standard size, wherein,

Described elementary errors comparison device comprises:

Crossbeam, the level land setting of described cross beam water;

Two cantilevers, described cantilever are arranged on described crossbeam vertically, and at least one cantilever can and can be locked on crossbeam along described crossbeam horizontal slip;

Two measuring heads that are oppositely arranged, described measuring head is connected on two described cantilevers, and one of them described measuring head can slide with respect to described cantilever;

Measurement instrument, the relative position relation of described measurement instrument and described cantilever is fixed, and is connected with the measuring head that can slide with respect to described cantilever.

2. dimension measuring device according to claim 1, is characterized in that, described standard to meter apparatus by horizontally disposed gauge block module sets primary standard size.

3. dimension measuring device according to claim 2, is characterized in that, is placed on base plate to described gauge block component level.

4. dimension measuring device according to claim 1, is characterized in that, described measurement instrument comprises clock gauge or dial gauge.

5. dimension measuring device according to claim 1, is characterized in that, described elementary errors comparison device is accurately set the primary standard size by the back-up block that is arranged on described crossbeam below.

6. dimension measuring device according to claim 5, is characterized in that, is provided with the groove that matches with described gauge block assembly in the bottom of described back-up block, and described back-up block directly is placed on the both sides of described gauge block assembly.

7. dimension measuring device according to claim 1, it is characterized in that, be connected with respectively slide block on the sidewall of two described cantilevers, be provided with the second locking device between two described slide blocks and corresponding described cantilever, in order to optionally described slide block is fixed on described cantilever.

8. dimension measuring device according to claim 1, is characterized in that, is provided with the first locking device between described cantilever and described crossbeam, optionally to fix described cantilever and described crossbeam.

9. dimension measuring device according to claim 8, it is characterized in that, the rotating shaft that described the first locking device comprises cam lever and is arranged on described cantilever inside, the cam on described cam lever are articulated in described rotating shaft and can rotate realize the locking of cantilever and unclamp.

10. dimension measuring device according to claim 7, is characterized in that, described cantilever comprises the arm spare that is connected to the suspension member on described crossbeam and is fixedly connected on described suspension member below, and described the first locking device is arranged between described suspension member and described crossbeam.

11. dimension measuring device according to claim 10, it is characterized in that, be provided with the gathering sill of vertical extension on the sidewall that is connected with described slide block of described arm spare, described the second locking device comprises fastening bolt and is arranged on the interior auxiliary block of described gathering sill, be provided with thread groove on described auxiliary block, described fastening bolt crosses described slide block and conflicts in described thread groove.

12. dimension measuring device according to claim 7 is characterized in that, is inserted with horizontally extending two support bars at the bottom level of described slide block.

13. dimension measuring device according to claim 1 is characterized in that, is provided with auxiliary sleeve between two described measuring heads and described cantilever, described auxiliary sleeve is fixedly connected with described cantilever; Described measurement instrument is arranged on described auxiliary sleeve.

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