CN217155813U - Wheel system load test equipment - Google Patents

Abstract

The utility model discloses a train load test equipment belongs to train load abnormal sound and detects technical field. This train load test equipment includes lifting assembly and contact assembly, and lifting assembly includes linear driving body, and linear driving body's output can be followed vertical direction and gone up and down, and contact assembly rotates to be connected on linear driving body's output, and contact assembly's top is arranged in to the train, and contact assembly's top has the initial condition who supports the test condition of pressing and separate with the test wheel under linear driving body's drive. This train load test equipment can simulate the load operation environment of train to the abnormal sound under the high-speed load operation condition of train is tested, thereby screens out the train that the abnormal sound exceeds standard in advance, and then has avoided unqualified train to install to the robot on, and has avoided the later stage to need to dismantle the train because of unusual seriously from the robot and get off and detect the condition of maintenance and appear.

Description

Wheel system load test equipment

Technical Field

The utility model relates to a train load abnormal sound detects technical field, especially relates to a train load test equipment.

Background

With the rapid development of the logistics field, mobile robots such as AGV robots and wheel robots applied to logistics scenes play more and more important roles, and the research on how to improve the service performance of the mobile robots has wide application prospects and values.

The existing mobile robot needs to carry cargo to move when working, and a speed reducer at a gear train part of the mobile robot can generate abnormal sound when running. If with the train not test direct mount on mobile robot, dismantle the maintenance again after the abnormal sound appears in the load operation, not only waste time and energy, and the process is loaded down with trivial details, increased time cost at very big degree, influenced mobile robot's normal use.

Therefore, how to provide a device capable of simulating the load applied to the wheel train during high-speed operation to perform a load abnormal sound test on the wheel train used on the mobile robot in advance is a technical problem which needs to be solved at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a train load test equipment, this train load test equipment can simulate the load operation environment of train to the abnormal sound under the high-speed load operation condition of train is tested.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a train load test equipment, the train includes actuating mechanism and test wheel, actuating mechanism's output shaft with the test wheel transmission is connected, train load test equipment includes: the lifting assembly comprises a linear driving body, and the output end of the linear driving body can ascend or descend along the vertical direction; the contact assembly is rotatably connected to the output end of the linear driving body, the gear train is arranged above the contact assembly, and the top of the contact assembly is configured to have a test state of being pressed against the test wheel and an initial state of being separated from the test wheel under the driving of the lifting assembly.

Preferably, the lifting assembly further comprises a supporting structure and a mechanical limiting mechanism, the supporting structure is fixedly connected to the output end of the linear driving body, the middle part of the contact assembly is connected to the supporting structure, and the mechanical limiting mechanism is fixedly connected to the supporting structure and provided with a first limiting surface and a second limiting surface which are arranged at an included angle; the contact assembly comprises a V-shaped support, the V-shaped support and the mechanical limiting mechanism are arranged up and down, and the V-shaped outer wall surface of the V-shaped support can be abutted to the first limiting surface or the second limiting surface to limit the rotating angle of the V-shaped support.

Preferably, the mechanical limiting mechanism is a U-shaped frame, a middle inflection point of the V-shaped bracket is arranged in a U-shaped groove of the U-shaped frame, the U-shaped frame comprises a first side plate and a second side plate which are oppositely arranged, the top surface of the first side plate is the first limiting surface, and the top surface of the second side plate is the second limiting surface.

Preferably, the number of the V-shaped supports is two, and the two V-shaped supports are arranged in parallel at intervals; contact module still includes first pivot, second pivot, third pivot and a plurality of rolling element, first pivot is connected two between the first end of V type support, the second pivot is connected two between the second end of V type support, the third pivot is connected two between the middle part inflection point of V type support, the third pivot is connected through spherical bearing rotation and is in bearing structure is last, first pivot with all be provided with at least one in the second pivot the rolling element, the rolling element be used for with the test wheel supports and presses.

Preferably, the rolling elements are support bearings or rollers.

Preferably, the linear driver includes a rotary driving member, a screw nut, and a screw rod, the rotary driving member is connected to the screw nut in a transmission manner and can drive the screw nut to rotate, the screw rod is disposed through a nut hole of the screw nut and constitutes a screw nut pair, the screw rod is configured to be capable of ascending or descending when rotated, and the screw rod is fixedly connected to the support structure.

Preferably, the linear driving body is a cylinder or a linear motor.

Preferably, the linear driving body further comprises a shell, the rotary driving part is located inside the shell, the screw nut is fixedly arranged on the shell, the side portion of the shell is further provided with a detection limiting mechanism, the detection limiting mechanism comprises an upper limit detection mechanism, a zero position detection mechanism and a lower limit detection mechanism which are sequentially arranged from top to bottom at intervals, the side portion of the supporting structure is provided with a detection sheet, and the detection sheet can sequentially pass through the upper limit detection mechanism, the zero position detection mechanism and the lower limit detection mechanism.

Preferably, the supporting structure is further provided with a sliding rail, the sliding rail is arranged along the vertical direction, the shell is provided with a guide block, and the guide block is arranged in a sliding groove of the sliding rail.

As preferred, train load test equipment still includes the frame, the frame has installation cavity and table, the table is located the top of installation cavity, be provided with the through-hole on the table, lift the subassembly with contact module all sets up in the installation cavity, just contact module with the through-hole is just to setting up, the train sets up on the table, just the test wheel with the through-hole is just to setting up.

Preferably, the table plate is detachably connected with a fixing structure, and the driving mechanism is detachably connected with the fixing structure.

The utility model has the advantages that:

the utility model provides a train load test equipment, this train load test equipment include lifting assembly and contact assembly, and lifting assembly includes the straight line driving body, and vertical direction lift can be followed to the output of straight line driving body, and contact assembly rotates the output of connecting at the straight line driving body, and contact assembly's top is arranged in to the train, and contact assembly's top is configured to have the initial condition who supports the test state of pressing and with the test wheel separation with the test wheel under lifting assembly's drive. This train load test equipment can give its load when the train is high-speed to test the abnormal sound condition under the train load operation in advance, reduced the later stage and installed the probability that appears the abnormal sound behind the robot.

Drawings

Fig. 1 is a schematic structural view of a wheel train load testing device provided by an embodiment of the present invention after a front door plate is removed;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic structural diagram of the wheel train load testing device according to the embodiment of the present invention after the protective cover is removed;

FIG. 4 is a schematic diagram of a lifting assembly, a contact assembly and a gear train provided by an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a contact assembly and a wheel train in contact according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the contact assembly and gear train provided by an embodiment of the present invention in a disengaged configuration;

fig. 7 is a schematic structural diagram of a lifting assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a contact assembly provided by an embodiment of the present invention at a certain viewing angle;

fig. 9 is a schematic structural diagram of a contact assembly provided in an embodiment of the present invention from another perspective.

In the figure:

100. a wheel train; 101. a drive motor; 102. a speed reducer; 103. a test wheel;

200. a lifting assembly; 201. a rotation driving member; 202. a lead screw nut; 203. a screw rod; 204. a support structure; 205. a mechanical limiting mechanism; 206. an upper limit detection mechanism; 207. a zero position detection mechanism; 208. a lower limit detection mechanism; 209. detecting a sheet;

300. a contact assembly; 301. a V-shaped bracket; 302. a third rotating shaft; 303. a spherical bearing seat; 304. a rolling body;

400. a frame; 401. a table plate; 402. a mounting cavity; 403. a through hole; 404. a protective cover; 405. a wheel; 406. a fixed block;

500. an electrical component.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 9, the present embodiment provides a wheel train load testing device, which can provide a certain load for a wheel train 100 running at a high speed, so as to simulate a load working condition after the wheel train 100 is installed on a robot, and test an abnormal sound condition of the wheel train 100 in a high-speed load running condition, so as to screen the wheel train 100 with an abnormal sound exceeding the standard in advance, thereby avoiding the installation of an unqualified wheel train 100 on the robot, and avoiding the occurrence of a later condition that the wheel train 100 needs to be detached from the robot for detection and maintenance due to an abnormal severity. Of course, the gear train load test device can also perform a life test and a fatigue test on the gear train 100 in addition to the abnormal sound test.

In the present embodiment, the wheel train 100 includes a driving mechanism and a test wheel 103, in the present embodiment, the driving mechanism includes a driving motor 101 and a speed reducer 102, the driving motor 101 is in transmission connection with the speed reducer 102, and an output shaft of the speed reducer 102 is in transmission connection with the test wheel 103. In this embodiment, the test wheel 103 is a rubberized wheel.

With continued reference to fig. 1-3, the gear train load testing apparatus includes a frame 400, a lifting assembly 200, and a contact assembly 300. Wherein, frame 400 is the installation component and the guard member of this train load test equipment, and in this embodiment, frame 400 is assembled by member and plate and is formed, and specifically, the member is square pipe, and many square pipe concatenations form cube frame 400. On top of the cubic frame 400 is provided a table 401. The four side portions of the cubic frame 400 are respectively provided with a front door panel, a left side panel, a rear door panel, and a right side panel, and the front door panel is openably and closably connected to the front side of the cubic frame 400. The bottom of the cubic frame 400 is provided with a bottom plate on which a plurality of wheels 405 are provided, thereby making the train load testing apparatus easy to move. The cube frame 400 defines a mounting cavity 402 therein, and the lift assembly 200 and the contact assembly 300 are disposed within the mounting cavity 402. The table 401 is provided with a through hole 403, and the contact assembly 300 is disposed opposite to the through hole 403. The wheel train 100 is disposed on the table 401, and the test wheel 103 is disposed opposite to the through hole 403. The contact assembly 300 can be lifted into contact with the test wheel 103 by the lifting assembly 200, thereby applying a certain load to the test wheel 103 rotating at a high speed.

To avoid injury to the worker from the wheel train 100 running at high speed, as shown in fig. 1, a protective cover 404 is provided on the table 401, and the protective cover 404 is provided over the test wheel 103. Further, when the wheel train 100 is tested, the driving motor 101 of the wheel train 100 needs to be fixedly installed on the table board 401, and since the wheel train load testing equipment needs to test a plurality of wheel trains 100, in order to avoid irreversible damage to the table board 401 caused by the fact that the wheel train 100 is repeatedly disassembled and assembled on the table board 401, a fixing structure is detachably connected to the table board 401, the driving motor 101 is detachably connected with the fixing structure, and the fixing structure is used for replacing the table board 401 to bear mechanical damage caused by repeated disassembly and assembly. Alternatively, the fixing structure may be a fixing block 406, and screws are used for detachable connection between the fixing block 406 and the table 401 and between the fixing block 406 and a motor casing of the driving motor 101. Of course, the fixing structure may also be a clamping jaw or other structures capable of fixing the driving motor 101, which is not described herein.

The lifting assembly 200 is used for driving the contact assembly 300 to ascend or descend in a vertical direction, and specifically, as shown in fig. 4 to 7, the lifting assembly 200 includes a linear driving body and a supporting structure 204, in this embodiment, the supporting structure 204 is a gantry. The output end of the linear drive body can be raised or lowered in a vertical direction, and the support structure 204 is fixedly coupled to the output end of the linear drive body and can be raised and lowered in synchronization with the output end of the linear drive body.

In the present embodiment, the linear drive body includes a rotary drive member 201, a lead screw nut 202, and a lead screw 203. The linear driving body is a component for providing a rotational power, and may be a combination of a motor and a gear assembly, or a combination of a motor, a pulley and a belt, which is not particularly limited herein as long as one rotational power can be provided. The output end of the rotation driving component 201 is in transmission connection with the lead screw nut 202 and can drive the lead screw nut 202 to rotate. The lead screw 203 is disposed through a nut hole of the lead screw nut 202 and constitutes a lead screw nut pair, and when the lead screw nut 202 is rotated by a rotary drive, the lead screw 203 can be raised or lowered. Since the top end of the screw 203 is fixedly connected to the support structure 204, the support structure 204 can be raised or lowered along with it. Alternatively, in this embodiment, the linear drive body is an electric cylinder. Of course in other embodiments the linear drive body is a cylinder or a linear motor.

The linear drive body further comprises a housing, the rotary drive member 201 is located inside the housing, and the lead screw nut 202 is fixedly arranged on the housing. Further, the lateral part of casing still is provided with and detects stop gear, detects stop gear including last spacing detection mechanism 206, zero position detection mechanism 207 and the lower spacing detection mechanism 208 that from top to bottom sets up at interval in proper order. Optionally, the upper limit detection mechanism 206, the zero detection mechanism 207 and the lower limit detection mechanism 208 are proximity switches. A detection piece 209 is arranged on the side of the support structure 204, and the detection piece 209 can pass through the upper limit detection mechanism 206, the zero position detection mechanism 207 and the lower limit detection mechanism 208 in sequence.

When the detecting piece 209 is detected by the zero position detecting mechanism 207, the supporting structure 204 is at a zero position, and the gear train load testing device is at an initial position; when the upper limit detection mechanism 206 and the lower limit detection mechanism 208 respectively detect the detection piece 209, the gear train load testing device stops running, so that the lead screw 203 is prevented from exceeding the running range and being damaged. And, through detecting piece 209 and proximity switch's cooperation, can carry out accurate control to the height of lifting of subassembly 200, thereby avoid lifting the height too high pressure that makes between contact assembly 300 and the test wheel 103 and cause mechanical loss to and can realize lifting the accurate of subassembly 200 and reset, thereby make train load test equipment can carry out repeated detection to a plurality of trains 100.

With continued reference to fig. 7, the lifting assembly 200 further includes a mechanical limiting mechanism 205, wherein the mechanical limiting mechanism 205 is fixedly connected to the supporting structure 204 and has a first limiting surface and a second limiting surface arranged at an included angle. As shown in fig. 8 and 9, the contact assembly 300 includes a V-shaped bracket 301, the V-shaped bracket 301 and the mechanical limiting mechanism 205 are disposed up and down, the middle portion of the contact assembly 300 is rotatably connected to the supporting structure 204, and the V-shaped outer wall surface of the V-shaped bracket 301 can abut against the first limiting surface or the second limiting surface to limit the rotation angle of the V-shaped bracket 301. The wheel train 100 is disposed above the contact member 300, and the contact member 300 has a test state (shown in fig. 5) pressed against the test wheel 103 and an initial state (shown in fig. 6) separated from the test wheel 103. The installation deviation can be offset in the cooperation of V type support 301 and mechanical stop gear 205, when guaranteeing that V type support 301 can contact with test wheel 103, has avoided V type support 301 deflection angle too big, has guaranteed the stability of the load that contact assembly 300 can provide for test wheel 103.

In this embodiment, with reference to fig. 7, the mechanical limiting mechanism 205 is a U-shaped frame, the middle inflection point of the V-shaped bracket 301 is disposed in a U-shaped groove of the U-shaped frame, the U-shaped frame includes a first side plate and a second side plate which are disposed oppositely, the first side plate and the second side plate are vertical plates and are parallel to each other, a top surface of the first side plate is inclined to form a first limiting surface, and a top surface of the second side plate is inclined to form a second limiting surface.

Further, as shown in fig. 8 and 9, in the present embodiment, the number of the V-shaped brackets 301 is two, and the two V-shaped brackets 301 are arranged in parallel and spaced apart. The contact assembly 300 further includes a first shaft, a second shaft, a third shaft 302, and a plurality of rolling bodies 304. Specifically, a first rotating shaft is connected between first ends of the two V-shaped brackets 301, a second rotating shaft is connected between second ends of the two V-shaped brackets 301, and a third rotating shaft 302 is connected between middle inflection points of the two V-shaped brackets 301. More specifically, the contact assembly 300 further includes a spherical bearing and a spherical bearing seat 303, the spherical bearing is disposed in the mounting cavity of the spherical bearing seat, the third rotating shaft 302 is disposed through the bearing inner hole of the spherical bearing, and the bottom of the spherical bearing seat 303 is connected to the support structure 204. At least one rolling body 304 is arranged on each of the first rotating shaft and the second rotating shaft, and the rolling bodies 304 are used for abutting against the test wheel 103. In this embodiment, the rolling element 304 is a support bearing, but in other embodiments, the rolling element 304 may be a roller. Optionally, in this embodiment, three support bearings are disposed on each of the first rotating shaft and the second rotating shaft, and a position limitation is implemented between the support bearing located at the edge and the V-shaped bracket 301 on the same side by using a sleeve.

Because spherical bearing seat 303 is installed on the bearing structure 204 of lifting assembly 200, be provided with spherical bearing in the spherical bearing seat 303, and lifting assembly 200 drives bearing structure 204 through the linear driving body and reciprocates, bearing structure 204 drives contact assembly 300 simultaneously and jacks up to train 100, until the bearing in contact assembly 300 contacts the test wheel 103 of train 100, train 100 need keep high-speed rotation simultaneously, the outer lane of bearing rotates simultaneously this moment, the rotatory frictional force of train 100 has been offset when giving train 100 load. And, the setting of spherical bearing and spherical bearing seat 303 can offset the installation deviation, because machining error contact assembly 300 probably can't accurately install the central line position in train 100 to the deviation of distance or angle appears, accessible support bearing goes up and down to offset the deviation when appearing the distance deviation, and when the angular deviation appears, support bearing can't contact train 100 completely, and the lift force that rises through lifting subassembly 200 and produce at this moment makes spherical bearing seat 303 take place passively to deflect, thereby returns contact assembly 300.

Further, the supporting structure 204 is further provided with a slide rail, the slide rail is arranged along the vertical direction, the shell is provided with a guide block, the guide block is arranged in a slide groove of the slide rail, and when the supporting structure 204 ascends or descends, the slide rail can synchronously ascend or descend under the guide of the guide block so as to improve the moving precision. Specifically, two sides of the housing extend out to positions vertically connected to the guide blocks, and the positions are arranged in one-to-one correspondence with the two side columns of the support structure 204. The setting of slide rail and guide block not only can improve bearing structure 204 along the removal precision of vertical direction, and can play the effect to lead screw 203 direction and rectifying, prevents that lead screw 203 direction of motion from appearing the deviation and leading to the electric cylinder to damage.

Further, as shown in fig. 1, an electric element 500 is further disposed on the table 401 of the frame 400, and the electric element 500 includes a plurality of buttons and a controller, and the controller can be triggered by pressing the buttons, so as to control the linear driving body and the proximity switch of the lifting assembly 200.

In this embodiment, the controller may be a centralized controller or a distributed controller, for example, the controller may be a single-chip microcomputer or may be formed by a plurality of distributed single-chip microcomputers, and a control program may be run in the single-chip microcomputers to control the linear driving body and the proximity switch to implement the functions thereof.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A train load testing apparatus, a train (100) comprising a drive mechanism and a test wheel (103), an output shaft of the drive mechanism being in driving connection with the test wheel (103), the train load testing apparatus comprising:

the lifting assembly (200), the lifting assembly (200) comprises a linear driving body, and the output end of the linear driving body can ascend or descend along the vertical direction;

the contact assembly (300) is rotatably connected to the output end of the lifting assembly (200), the wheel train (100) is arranged above the contact assembly (300), and the top of the contact assembly (300) is configured to have a test state of being pressed against the test wheel (103) and an initial state of being separated from the test wheel (103) under the driving of the lifting assembly (200).

2. A train wheel load testing apparatus according to claim 1,

the lifting assembly (200) further comprises a supporting structure (204) and a mechanical limiting mechanism (205), the supporting structure (204) is fixedly connected to the output end of the linear driving body, the middle part of the contact assembly (300) is connected to the supporting structure (204), and the mechanical limiting mechanism (205) is fixedly connected to the supporting structure (204) and is provided with a first limiting surface and a second limiting surface which are arranged in an included angle;

contact module (300) include V type support (301), V type support (301) with mechanical stop gear (205) set up from top to bottom, the V type outer wall face of V type support (301) can with first spacing face or the spacing face butt of second, in order to restrict the turned angle of V type support (301).

3. A train wheel load testing apparatus according to claim 2,

mechanical stop gear (205) are U type frame, the middle part flex point of V type support (301) is arranged in the U-shaped inslot of U type frame, U type frame includes two relative first curb plate and the second curb plate that sets up, the top surface of first curb plate is first spacing face, the top surface of second curb plate is the spacing face of second.

4. A train wheel load testing apparatus according to claim 2,

the number of the V-shaped supports (301) is two, and the two V-shaped supports (301) are arranged in parallel at intervals;

contact module (300) still includes first pivot, second pivot, third pivot (302) and a plurality of rolling element (304), first pivot is connected two between the first end of V type support (301), the second pivot is connected two between the second end of V type support (301), third pivot (302) are connected two between the middle part inflection point of V type support (301), third pivot (302) rotate through spherical bearing and connect in bearing structure (204), first pivot with all be provided with at least one in the second pivot rolling element (304), rolling element (304) be used for with test wheel (103) are supported and are pressed.

5. A train wheel load testing apparatus according to claim 4,

the rolling bodies (304) are support bearings or rollers.

6. A train wheel load testing apparatus according to claim 2,

the linear driving body comprises a rotary driving component (201), a lead screw nut (202) and a lead screw (203), the rotary driving component (201) is in transmission connection with the lead screw nut (202) and can drive the lead screw nut (202) to rotate, the lead screw (203) is arranged through a nut hole of the lead screw nut (202) and forms a lead screw nut pair, the lead screw (203) can ascend or descend when the lead screw nut (202) rotates, and the lead screw (203) is fixedly connected with the supporting structure (204).

7. A train wheel load testing apparatus according to claim 6,

the linear driving body further comprises a shell, the rotary driving part (201) is located inside the shell, the screw nut (202) is fixedly arranged on the shell, the side portion of the shell is further provided with a detection limiting mechanism, the detection limiting mechanism comprises an upper limit detection mechanism (206), a zero position detection mechanism (207) and a lower limit detection mechanism (208) which are sequentially arranged from top to bottom at intervals, the side portion of the supporting structure (204) is provided with a detection sheet (209), and the detection sheet (209) can sequentially pass through the upper limit detection mechanism (206), the zero position detection mechanism (207) and the lower limit detection mechanism (208).

8. A train wheel load testing apparatus according to claim 7,

the supporting structure (204) is further provided with a sliding rail, the sliding rail is arranged along the vertical direction, the shell is provided with a guide block, and the guide block is arranged in a sliding groove of the sliding rail.

9. A train wheel load testing device according to any one of claims 1 to 8,

train load test equipment still includes frame (400), frame (400) have installation cavity (402) and table (401), table (401) are located the top of installation cavity (402), be provided with through-hole (403) on table (401), lift subassembly (200) with contact module (300) all sets up in installation cavity (402), just contact module (300) with through-hole (403) are just to setting up, train (100) set up on table (401), just test wheel (103) with through-hole (403) are just to setting up.

10. A train wheel load testing apparatus according to claim 9,

the table plate (401) is detachably connected with a fixing structure, and the driving mechanism is detachably connected with the fixing structure.

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