Multifunctional performance detection equipment for mobile phone battery and method thereof

Abstract

The invention relates to the field of mobile phone battery detection, in particular to multifunctional performance detection equipment for a mobile phone battery and a method thereof. A multifunctional performance detection device for a mobile phone battery comprises a console, a protective shell and the like. A protective shell is fixedly connected to the control table. The first connecting rope is pressed on the battery body, and the second connecting rope clamps and limits the side surface of the battery body, so that the battery bodies with different shapes in the prior art can be effectively limited and fixed, and the situation that the stability of the battery cannot be kept, the battery body is subsequently pressed, and the battery body is damaged is avoided. The stress limit of the battery cannot be accurately measured, the actual use limitation is large, then the detection column is in contact with the flat cable contact of the battery body, the charging and discharging characteristic test of the fast charging performance and the discharging curve of the battery body and the safety test of overcharging protection, overdischarging protection and the like are achieved, the test process is continuously carried out, the detection efficiency is high, and the reliability is high. And the time required for complete detection of the battery body is effectively saved.

Description

Technical Field

[0001] The present invention relates to the field of mobile phone battery detection, and in particular to a multifunctional performance detection device for mobile phone batteries and a method thereof. Background Art

[0002] During the production and processing of mobile phone batteries, in order to ensure that the mobile phone batteries can work safely, reliably and efficiently, it is generally necessary to test the performance of the mobile phone batteries in multiple aspects, such as capacity, internal resistance, self-discharge rate, charge and discharge characteristics, safety, physical properties, environmental adaptability and electrical characteristics, etc. Comprehensive testing of mobile phone batteries can improve user experience and satisfaction.

[0003] Among them, various tests on mobile phone batteries are generally completed separately in different instruments. It takes a lot of time and energy to conduct a complete test on the mobile phone battery. The compression test is the content of the safety test, which is used to evaluate the safety and structural integrity of the mobile phone battery when subjected to external mechanical pressure. The traditional battery mechanical performance test method cannot effectively fix both the straight-shaped and L-shaped batteries in the existing technology, and cannot ensure the stability of the battery during the test. Therefore, when testing batteries of different shapes, it is impossible to accurately measure the force limit of the battery, and the actual use is greatly limited. Summary of the invention

[0004] In order to overcome the shortcomings of the existing complete battery testing process that takes a lot of time and energy, cannot guarantee the stability of mobile phone batteries during mechanical performance testing, and has great limitations in actual use, the present invention provides a multifunctional performance testing device and method for mobile phone batteries.

[0005] The technical implementation scheme of the present invention is: a multifunctional performance testing equipment for mobile phone batteries, including a control console, a protective shell, a hatch and a fixed frame; the control console is fixedly connected to the protective shell; the protective shell is movably connected to two hatches; the fixed frame is fixedly connected inside the protective shell; it also includes a pressure platform, an electric hydraulic press, a power unit, a motor, a support rod, a first connecting rope and a second connecting rope; the fixed frame is fixedly connected to the pressure platform; the fixed frame is equipped with an electric hydraulic press; the electric hydraulic press runs through the protective shell; the fixed frame is connected to the power unit; the power unit is connected to a number of motors; each motor output shaft is fixedly connected to a support rod; the height of the pressure platform is lower than the rotation center of the support rod; all the support rods are connected to the power unit; a first connecting rope is connected between each of the front and rear adjacent support rods, and the first connecting rope is an elastic rope; a second connecting rope is connected between each of the front and rear adjacent support rods, and the second connecting rope is a rigid rope; the power unit is used to drive the first connecting rope and the second connecting rope to fix the battery body on the pressure platform.

[0006] More preferably, the power unit includes an electric guide rail, an electric slider and a mounting plate; the fixed frame is installed with two electric guide rails distributed front and back; each electric guide rail is slidably connected to two electric sliders distributed left and right; each electric slider is fixedly connected to a mounting plate; each mounting plate is fixedly connected to a motor; and each support rod is rotatably connected to a mounting plate.

[0007] More preferably, it also includes a contact plate, an electric actuator and a detection column; the contact plate is fixedly connected to the telescopic part of the electric hydraulic press; two electric actuators are installed on the contact plate; the telescopic part of each electric actuator is fixedly connected to a detection column; all the detection columns are slidably connected to the contact plate; the detection column is electrically connected to the control console; the detection column is used to contact the power cable of the battery body.

[0008] More preferably, the contact plate is a heat-resistant and corrosion-resistant plate with upwardly turned edges on all sides.

[0009] More preferably, it also includes a duct, a cross pipe and an exhaust pipe; the protective shell is connected to two ducts; the support rods are hollow tubes, and the two rear support rods are each connected to a duct; the front and rear corresponding support rods are connected to a cross pipe; each cross pipe is provided with a number of nozzles; and the rear of the protective shell is connected to an exhaust pipe.

[0010] More preferably, the nozzles on the two transverse tubes are symmetrically arranged.

[0011] More preferably, a fire barrier is provided on the exhaust pipe.

[0012] More preferably, it further comprises a main pipe and a branch pipe; the fixed frame is connected to a plurality of main pipes; each main pipe has a plurality of branch pipes; a plurality of seepage holes are opened on the pressure platform; each branch pipe corresponds to a seepage hole.

[0013] More preferably, a groove is formed on the pressure bearing platform.

[0014] A multifunctional performance testing method for a mobile phone battery, comprising the following specific steps: 1. First, use the first connecting rope and the second connecting rope on the support rod and the electric slider on the same electric guide rail to fix the battery body and limit the position and align it; 2. Apply pressure to the battery body through an electric hydraulic press to perform a compression test on the battery body; 3. After the compression test is completed, move the battery body and use the detection column to contact the battery body wiring contacts, thereby realizing the charge and discharge characteristics test and safety test of the battery body; 4. If the battery body catches fire during the inspection process, nitrogen will be sprayed through the horizontal pipe to extinguish the fire of the battery body, prevent the fire from spreading, and provide safety protection for battery leakage.

[0015] Compared with the prior art, the present invention has the following advantages: 1. By pressing the first connecting rope onto the battery body and the second connecting rope clamping and limiting the side of the battery body, it is achieved that the battery bodies of different shapes in the prior art can be effectively limited and fixed, and it is effectively avoided that the battery bodies of different shapes in the prior art are tested and the stability of the battery cannot be maintained, resulting in the subsequent application of pressure on the battery body by an electric hydraulic press, and the force limit of the battery cannot be accurately measured, which has great limitations in actual use.

[0016] 2. The battery body is driven to slide left and right on the pressure platform through the second connecting rope, and then the detection column is used to contact the wiring contacts of the battery body to realize the charging and discharging characteristic test of the fast charging performance and discharge curve of the battery body, as well as safety tests such as overcharge protection and over-discharge protection. The test process is carried out continuously with high detection efficiency, which effectively saves the time required for complete detection of the battery body.

[0017] 3. By setting a horizontal tube on the support rod, nitrogen is sprayed toward the battery body, and the two horizontal tubes move toward each other, which effectively prevents the fire of the battery body from spreading, extinguishes the fire of the battery body, and prevents the battery body from re-igniting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the protective shell of the present invention; Figure 3 It is a schematic diagram of the installation position of the electric hydraulic press of the present invention; Figure 4 It is a schematic diagram of the installation position of the contact plate of the present invention; Figure 5 This is a schematic diagram of the first connecting rope and the second connecting rope of the present invention limiting and fixing the battery body; Figure 6 This is a schematic diagram of the installation position of the cross pipe of the present invention; Figure 7 It is a schematic diagram of flame retardant of a battery body according to the present invention; Figure 8 It is a schematic diagram of the branch pipe installation position of the present invention.

[0019] The markings of the components in the accompanying drawings are as follows: 001-battery body, 1-console, 2-protective shell, 3-hatch, 4-fixed frame, 5-pressure platform, 6-electric hydraulic press, 7-electric guide rail, 8-electric slide, 9-mounting plate, 10-motor, 11-support rod, 12-first connecting rope, 13-second connecting rope, 14-contact plate, 15-electric actuator, 16-detection column, 101-conduit, 102-cross pipe, 103-exhaust pipe, 10201-nozzle, 201-main pipe, 202-branch pipe, 5001-groove, 5002-seepage hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1: A multifunctional performance testing device for mobile phone batteries, according to Figure 1-Figure 5 As shown, it includes a console 1, a protective shell 2, a hatch 3 and a fixed frame 4; the protective shell 2 is fixedly connected to the console 1; the protective shell 2 is hinged with two symmetrically arranged hatches 3, and the hatches 3 are made of transparent explosion-proof material; a fixed frame 4 is welded inside the protective shell 2; It also includes a pressure platform 5, an electric hydraulic press 6, a power unit, a motor 10, a support rod 11, a first connecting rope 12 and a second connecting rope 13; the fixed frame 4 is bolted to the pressure platform 5; the electric hydraulic press 6 is installed on the upper part of the fixed frame 4; the electric hydraulic press 6 passes through the protective shell 2; the fixed frame 4 is connected to the power unit; the power unit is connected to a number of motors 10; each motor 10 output shaft is fixedly connected to a support rod 11; the height of the pressure platform 5 is lower than the rotation center of the support rod 11; all the support rods 11 are connected to the power unit; a first connecting rope 12 is connected between each of the front and rear adjacent support rods 11, and the first connecting rope 12 is an elastic rope; a second connecting rope 13 is connected between each of the front and rear adjacent support rods 11, and the second connecting rope 13 is a rigid rope; each second connecting rope 13 is located below a first connecting rope 12; the power unit is used to drive the first connecting rope 12 and the second connecting rope 13 to fix the battery body 001 on the pressure platform 5.

[0022] The power unit includes an electric guide rail 7, an electric slider 8 and a mounting plate 9; the fixed frame 4 is equipped with two electric guide rails 7 distributed front and back; each electric guide rail 7 is slidably connected to two electric sliders 8 distributed left and right; each electric slider 8 is fixedly connected to a mounting plate 9; each mounting plate 9 is fixedly connected to a motor 10; each support rod 11 is rotatably connected to a mounting plate 9.

[0023] It also includes a contact plate 14, an electric actuator 15 and a detection column 16; the telescopic part of the electric hydraulic press 6 is fixedly connected to the contact plate 14; the contact plate 14 is equipped with two left-right symmetrical electric actuators 15; the electric actuator 15 is an electric push rod; the telescopic part of each electric actuator 15 is fixedly connected to a detection column 16; all the detection columns 16 are slidably connected to the contact plate 14; the detection column 16 is electrically connected to the control console 1; the detection column 16 is used to contact the power cable of the battery body 001.

[0024] The contact plate 14 is a heat-resistant and corrosion-resistant plate with upwardly turned edges on all sides, and is used to prevent the battery body 001 fragments or electrolyte from being retained on the contact plate 14 when the battery body 001 is damaged.

[0025] A multifunctional performance testing method for a mobile phone battery, comprising the following specific steps: 1. First, use the first connecting rope 12 and the second connecting rope 13 on the support rod 11 and the electric slider 8 on the same electric guide rail 7 to fix and limit the battery body 001; 2. Apply pressure to the battery body 001 through the electric hydraulic press 6 to perform a compression test on the battery body 001; 3. After the compression test is completed, the position of the battery body 001 is moved, and the detection column 16 is used to contact the wiring contact of the battery body 001, thereby realizing the charge and discharge characteristic test and safety test of the battery body 001; 4. If the battery body 001 catches fire during the detection process, nitrogen is sprayed through the cross pipe 102 to extinguish the fire of the battery body 001, prevent the fire from spreading, and provide safety protection for battery leakage.

[0026] The working steps of the above embodiment are: First, the staff takes the battery body 001 to be tested, and then opens the hatch 3. The staff then places the battery body 001 on the pressure platform 5, and makes the wiring contacts of the battery body 001 face upwards. Then the hatch 3 is closed, and then the control console 1 is operated. The test program is set on the console 1 and started. Then, each motor 10 is controlled to start. The two motors 10 on the same electric guide rail 7 rotate in opposite directions, and synchronously drive the support rod 11 and the corresponding parts thereon to rotate. The two support rods 11 on the same electric guide rail 7 are distributed in an eight-shaped shape. At the same time, the two electric sliders 8 on the same electric guide rail 7 are controlled to move in a direction approaching each other, and the corresponding mounting plates 9 and the parts thereon are synchronously driven to move together. When the first connecting rope 12 reaches the top of the battery body 001 and the second connecting rope 13 has not yet reached the top of the battery body 001, the motor 10 is controlled to continue to rotate, and the support rod 11 and the corresponding parts thereon are synchronously driven to rotate, so that the elastic first connecting rope 12 is pressed on the battery body 001, and the battery body 001 is pressed on the pressure platform 5 by the elastic reaction force of the first connecting rope 12 above. Figure 5 As shown, the motor 10 is then controlled to stop, and the two electric sliders 8 on the same electric guide rail 7 are controlled to move in a direction approaching each other, and the corresponding second connecting ropes 13 are synchronously driven to move, wherein the first connecting rope 12 that has been pressed on the battery body 001 slides against the battery body 001, and then the second connecting rope 13 contacts the side of the battery body 001, and at this time, the two rigid second connecting ropes 13 that contact the side of the battery body 001 move in a direction approaching each other, and the two second connecting ropes 13 limit and clamp the battery body 001 to realize the alignment of the battery body 001. In summary, by fixing the upper part and the left and right sides of the battery body 001, the pre-test fixing work of the battery body 001 is completed, and this method can also effectively fix the existing straight plate and L-shaped battery bodies 001, thereby ensuring the stability of the battery body 001 during testing, facilitating the performance testing of the battery body 001 in the prior art, and accurately measuring the force limit of the battery body 001, and having broad prospects for practical application.

[0027] Then, the electric hydraulic press 6 is controlled to start, and the electric hydraulic press 6 extends and squeezes the battery body 001 with a fixed pressure. By controlling the pressure output by the electric hydraulic press 6, the compressive performance of the battery body 001 under different pressures is tested, thereby measuring the force limit of the battery body 001. Then, the electric hydraulic press 6 is controlled to contract, so that the telescopic part of the electric hydraulic press 6 and the corresponding parts thereon move upward. If the battery body 001 is damaged at this time, the damaged battery body 001 is taken out and replaced, and the above operation is repeated to test the battery body 001. If the battery body 001 remains intact after the compression test, the next test is continued. At this time, the battery body 001 is fixed by the support rod 11, the first connecting rope 12 and the second connecting rope 13, so all the electric sliders 8 are controlled to move in the same direction together, and the corresponding mounting plate 9 and the corresponding parts thereon are driven to move synchronously, so that the rigid second connecting rope 13 pushes the battery body 001 slides on the pressure platform 5 until the wiring contact on the battery body 001 reaches the bottom of one of the detection columns 16, and all the electric sliders 8 are controlled to stop moving. Then the electric hydraulic machine 6 is controlled to extend so that the telescopic part of the electric hydraulic machine 6 is attached to the battery body 001, and the electric hydraulic machine 6 is controlled to stop, and then the corresponding electric actuator 15 located above the wiring contact on the battery body 001 is retracted, and the corresponding detection column 16 is simultaneously driven to move downward. The detection column 16 contacts the wiring contact of the battery body 001, and the battery body 001 is tested for fast discharge and fast charging performance, as well as safety tests such as overcharge protection, over-discharge protection and short-circuit protection of the battery body 001 are started. After the test is completed, the electric actuator 15 is controlled to extend so that the detection column 16 is reset, and the electric hydraulic machine 6 is controlled to retract. Finally, the staff can open the hatch 3, take out the battery body 001, and replace the next test sample for testing.

[0028] Second embodiment: Based on the first embodiment, Figure 1-Figure 2 and Figure 6-Figure 8 As shown, it also includes a conduit 101, a transverse pipe 102 and an exhaust pipe 103; the protective shell 2 is connected to two conduits 101 distributed on the left and right; the support rods 11 are hollow tubes, and the two rear support rods 11 are each connected to a conduit 101; the front and rear corresponding support rods 11 are commonly connected to a transverse pipe 102; each transverse pipe 102 is opened with a plurality of nozzles 10201; the rear of the protective shell 2 is connected to the exhaust pipe 103.

[0029] The nozzles 10201 on the two transverse tubes 102 are symmetrically arranged, and are in an inverted figure eight shape when viewed from the front to the back.

[0030] The exhaust pipe 103 is provided with a fireproof screen to intercept dust and impurities in the gas.

[0031] It also includes a main pipe 201 and a branch pipe 202; the fixed frame 4 is connected to a number of main pipes 201 equidistantly distributed front and back; each main pipe 201 has a number of branch pipes 202; a number of seepage holes 5002 are opened on the pressure platform 5; each branch pipe 202 corresponds to a seepage hole 5002.

[0032] A groove 5001 is formed on the pressure platform 5 to prevent the accumulated liquid from leaking out after the battery body 001 is damaged.

[0033] The working steps of the above embodiment are: Considering that the battery body 001 may be crushed during the compression test of the battery body 001, which may cause the battery body 001 to catch fire, the external nitrogen tank is connected to the two conduits 101. When the battery body 001 catches fire during the inspection, the motor 10 is controlled to start so that the support rod 11 returns to the vertical state. Figure 7 As shown, the nitrogen tank is then controlled to be poured into the hollow support rod 11 through the conduit 101, and then the nitrogen is ejected through the nozzle 10201 of the cross tube 102, and at the same time, the two electric sliders 8 on the same electric guide rail 7 are controlled to approach each other and symmetrically arranged nozzles 10201 to spray nitrogen toward the battery body 001, as shown in FIG. Figure 7 As shown, nitrogen is purged from the left and right sides of the battery body 001 to the middle, thereby isolating the air from both sides to the middle of the battery body 001 in sequence, which can not only prevent the fire of the battery body 001 from spreading, but also extinguish the fire of the battery body 001 and prevent the battery body 001 from reigniting. Then the external air circulation machine is connected to the exhaust pipe 103, and the external air circulation machine extracts the air in the protective shell 2 through the exhaust pipe 103 and processes it, which effectively prevents the damaged battery body 001 from burning and producing toxic and harmful gases to stimulate the respiratory system of the staff when replacing the battery body 001. After observing through the transparent hatch 3 that the smoke in the protective shell 2 is all extracted, the hatch 3 is opened, and the staff wears safety protection equipment, takes the battery body 001 on the pressure platform 5 away, and places it in the designated collection box.

[0034] After the battery body 001 is removed, in order to avoid the battery body 001 from leaking liquid from the battery body 001 and being retained on the pressure platform 5 due to the battery body 001 being broken and not fully burned during the above test, a groove 5001 is opened on the pressure platform 5 to effectively prevent the leaked electrolyte from flowing to other positions and causing corrosion of related electrical components. Then the staff first uses a pressure water flow to flush the groove 5001 to try to flush away the remaining leaked liquid, and performs a preliminary flushing of the groove 5001. The waste water flows into the corresponding branch pipe 202 through each seepage hole 5002. Then a neutral cleaning liquid is taken and poured on the groove 5001 to deeply clean the combustion residue and leaked liquid on the groove 5001. Then the cleaning waste liquid also flows into the branch pipe 202 through the seepage hole 5002. Finally, the waste liquid converges to each main pipe 201. Waste liquid collection buckets are set at both ends of the main pipe 201 to collect the cleaning waste liquid and avoid the cleaning waste liquid from polluting the environment.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional performance testing device for a mobile phone battery, comprising a console (1), a protective shell (2), a hatch (3) and a fixed frame (4); the console (1) is fixedly connected to the protective shell (2); the protective shell (2) is movably connected to two hatches (3); the fixed frame (4) is fixedly connected inside the protective shell (2); the characteristics are: It also includes a pressure-bearing platform (5), an electric hydraulic machine (6), a power unit, a motor (10), a support rod (11), a first connecting rope (12) and a second connecting rope (13); the fixed frame (4) is fixedly connected to the pressure-bearing platform (5); the fixed frame (4) is installed with the electric hydraulic machine (6); the electric hydraulic machine (6) passes through the protective shell (2); the fixed frame (4) is connected to the power unit; the power unit is connected to a plurality of motors (10); each motor (10) has an output shaft fixedly connected to a support rod (11); the pressure-bearing platform The height of the support rod (5) is lower than the rotation center of the support rod (11); all the support rods (11) are connected to the power unit; a first connecting rope (12) is connected between each of the front and rear adjacent support rods (11), and the first connecting rope (12) is an elastic rope; a second connecting rope (13) is connected between each of the front and rear adjacent support rods (11), and the second connecting rope (13) is a rigid rope; the power unit is used to drive the first connecting rope (12) and the second connecting rope (13) to fix the battery body (001) on the pressure platform (5).

2. A multifunctional performance testing device for mobile phone batteries according to claim 1, characterized in that: The power unit comprises an electric guide rail (7), an electric slider (8) and a mounting plate (9); the fixed frame (4) is provided with two electric guide rails (7) distributed front and rear; each electric guide rail (7) is slidably connected to two electric sliders (8) distributed left and right; each electric slider (8) is fixedly connected to a mounting plate (9); each mounting plate (9) is fixedly connected to a motor (10); and each support rod (11) is rotatably connected to a mounting plate (9).

3. A multifunctional performance testing device for mobile phone batteries according to claim 1, characterized in that: The invention also comprises a contact plate (14), an electric actuator (15) and a detection column (16); the telescopic part of the electric hydraulic machine (6) is fixedly connected to the contact plate (14); two electric actuators (15) are installed on the contact plate (14); the telescopic part of each electric actuator (15) is fixedly connected to a detection column (16); all the detection columns (16) are slidably connected to the contact plate (14); the detection column (16) is electrically connected to the control console (1); and the detection column (16) is used to contact the power cable of the battery body (001).

4. A multifunctional performance testing device for mobile phone batteries according to claim 3, characterized in that: The contact plate (14) is a heat-resistant and corrosion-resistant plate having upwardly turned edges on all sides.

5. A multifunctional performance testing device for mobile phone batteries according to claim 3, characterized in that: It also includes a conduit (101), a transverse pipe (102) and an exhaust pipe (103); the protective shell (2) is connected to the two conduits (101); the support rods (11) are hollow tubes, and the two rear support rods (11) are each connected to a conduit (101); the front and rear corresponding support rods (11) are connected to a transverse pipe (102); each transverse pipe (102) is provided with a plurality of nozzles (10201); and the rear of the protective shell (2) is connected to the exhaust pipe (103).

6. A multifunctional performance testing device for mobile phone batteries according to claim 5, characterized in that: The nozzles (10201) on the two transverse tubes (102) are symmetrically arranged.

7. A multifunctional performance testing device for mobile phone batteries according to claim 6, characterized in that: A fireproof screen is provided on the exhaust pipe (103).

8. A multifunctional performance testing device for mobile phone batteries according to claim 5, characterized in that: It also includes a main pipe (201) and branch pipes (202); the fixed frame (4) is connected to a plurality of main pipes (201); each main pipe (201) has a plurality of branch pipes (202); a plurality of seepage holes (5002) are opened on the pressure platform (5); and each branch pipe (202) corresponds to a seepage hole (5002).

9. A multifunctional performance testing device for a mobile phone battery according to claim 8, characterized in that: The pressure bearing platform (5) is provided with a groove (5001).

10. A multifunctional performance testing method for a mobile phone battery, applicable to a multifunctional performance testing device for a mobile phone battery as claimed in any one of claims 5 to 9, the specific steps being:

1. First, the battery body (001) is fixed and aligned by using the first connecting rope (12) and the second connecting rope (13) on the support rod (11) and the electric slider (8) on the same electric guide rail (7); 2. applying pressure to the battery body (001) by means of an electric hydraulic press (6) to perform a compression test on the battery body (001); 3. After the compression test is completed, the position of the battery body (001) is moved, and the detection column (16) is used to contact the wiring contact of the battery body (001), thereby realizing the charge and discharge characteristic test and safety test of the battery body (001); 4. If the battery body (001) catches fire during the detection process, nitrogen is sprayed through the horizontal pipe (102) to extinguish the fire of the battery body (001) and prevent the fire from spreading, as well as to provide safety protection for battery leakage treatment.

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