Dual hydraulic pump power take-off mechanism and power take-off method for pure electric off-highway mining dump truck

Abstract

The application discloses a kind of pure electric non-highway mining dump truck double hydraulic pump power take-off mechanism, comprising: power take-off motor and two hydraulic pumps, two hydraulic pumps are connected at the both ends of power take-off motor respectively;The rotating shaft of hydraulic pump is rigidly connected with the rotating shaft of power take-off motor;One of two hydraulic pumps is steering pump, and the other is lifting and disc brake duplex pump.The application also discloses a kind of pure electric non-highway mining dump truck double hydraulic pump power take-off power take-off method.The application solves the technical problem of taking power for two high-power hydraulic pumps at the same time in a small space.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of pure electric mine dump truck, and particularly relates to a pure electric off-highway mine dump truck double hydraulic pump power take-off mechanism and power take-off method. BACKGROUND

[0002] The pure electric mine truck is becoming a necessary transportation tool for building a green mine and has become increasingly popular. However, the pure electric mine truck used in mines at present is a pure electric wide-body dump truck transformed from a truck for highway transportation, and the chassis system is basically the same as the truck for highway transportation. The features are large space, front and rear air brakes for the braking system, single cylinder for the carriage lifting cylinder and installed at the front side of the carriage, and small steering force. The vehicle does not have disc brake hydraulic pumps, and only needs a steering pump and a lifting pump with small power. The steering pump and the lifting pump do not work at the same time, and the power can be taken from the gearbox to meet the use requirements.

[0003] However, with the increasing strictness of safety requirements in mines, more and more large mine users tend to use pure electric off-highway mine rigid dump trucks. The main features of the truck are that the frame is a high-strength alloy steel welded rigid frame, has strong carrying capacity, long service life and better safety, the overall vehicle has a short wheelbase, and is equipped with an oil-cooled disc brake system, a double-cylinder multi-stage carriage lifting system and a full hydraulic steering system.

[0004] In order to increase the escape ability of the pure electric off-highway mine rigid dump truck, the steering power needs to be large. The large steering power requires large power of the steering pump and the disc brake pump (which belongs to a hydraulic pump), and the steering pump and the disc brake pump need to work at the same time. Due to the short wheelbase of the vehicle and the small space inside the frame, many components need to be installed, and there is no space for the steering pump and the disc brake pump (which belong to hydraulic pumps) to configure motors, controllers and frequency converters. If two high-power hydraulic pumps are configured with power sources respectively, corresponding motors, controllers and frequency converters need to be configured for the two high-power hydraulic pumps. In order to adapt to poor road conditions and improve the escape ability of the vehicle, the two high-power hydraulic pumps need to work at the same time. The method of configuring two high-power hydraulic pumps with power sources cannot meet the use requirements of the two high-power hydraulic pumps working at the same time, and cannot solve the technical problem of vehicle escape. Limited by the above conditions, multiple motors cannot be arranged to take power from each hydraulic pump, which limits the performance output of the pure electric off-highway mine rigid dump truck. SUMMARY

[0005] The technical problem solved by the present application is to provide a pure electric off-highway mine dump truck double hydraulic pump power take-off mechanism and power take-off method, which solves the technical problem of taking power from two high-power hydraulic pumps at the same time in a small space.

[0006] To achieve the above purpose, the technical solution used by the present application is as follows:

[0007] The double hydraulic pump power take-off mechanism of the pure electric off-highway mining dump truck comprises a power take-off motor and two hydraulic pumps, the two hydraulic pumps are connected at both ends of the power take-off motor, and the rotating shaft of the hydraulic pump is rigidly connected with the rotating shaft of the power take-off motor.

[0008] Further, one of the two hydraulic pumps is a steering pump, and the other is a lifting and disc brake duplex pump.

[0009] Further, the power take-off motor comprises a motor shell, a motor flange, a motor rotor and a motor stator, the motor shell is provided with a plurality of shell threaded holes at the end, the motor flange is provided with a rotor through hole in the middle, a plurality of flange threaded holes are arranged outside the rotor through hole, and a flange fixing through hole is arranged outside the flange threaded hole; the flange fixing bolt is connected to the shell threaded hole through the flange fixing through hole, and the two motor flanges are connected at both ends of the motor shell; the motor stator is fixed to the inner wall of the motor shell, and the motor rotor is sleeved in the rotor through hole at both ends.

[0010] Further, the motor flange is provided with a plurality of connecting sides at the side, and the connecting side is provided with a plurality of side threaded holes; the fixed plate is provided with a plurality of fixed plate through holes, and the flange connecting bolt is connected to the side threaded hole through the fixed plate through hole.

[0011] Further, the lifting and disc brake duplex pump selects a gear pump, which comprises a duplex pump shell and a duplex pump gear, the duplex pump gear is arranged inside the duplex pump shell, the side of the duplex pump shell is provided with a duplex pump power output port and a duplex pump input port, the end of the duplex pump shell is provided with a duplex pump fixed end plate, the outer side of the duplex pump fixed end plate is provided with a duplex pump fixed through hole, and the middle part is provided with a duplex pump gear through hole; the duplex pump fixing bolt is connected to the flange threaded hole through the duplex pump fixed through hole, and the end of the duplex pump shell is connected to the motor flange; the rotating shaft of the duplex pump gear extends out of the duplex pump gear through hole and is rigidly connected with the motor rotor.

[0012] Further, a plurality of sealing grooves are arranged inside the duplex pump shell, a sealing ring is arranged in the sealing groove, and the rotating shaft of the duplex pump gear is sleeved on the sealing ring; the duplex pump power output port and the duplex pump input port are respectively provided with a duplex pump pipeline connecting flange, and the duplex pump pipeline connecting flange is provided with a pipeline connecting threaded hole.

[0013] Further, the steering pump selects a vane pump, and the structure comprises a steering pump shell, a steering pump rotor, the steering pump rotor is arranged in the steering pump shell; a steering pump input port is arranged on the side of the steering pump shell, a steering pump power output end is arranged on the top, a steering pump fixed end plate is arranged on the end of the steering pump shell, a steering pump fixed through hole is arranged on the outside of the steering pump fixed end plate, and a steering pump rotor through hole is arranged on the middle; a steering pump fixed bolt is connected on the flange threaded hole through the steering pump fixed through hole; one end of the steering pump rotor is installed in the steering pump shell, and the other end is connected with the motor rotor through the steering pump rotor through hole.

[0014] Further, a plurality of sealing grooves are arranged in the steering pump shell, and sealing rings are arranged in the sealing grooves, and the steering pump rotor is sleeved on the sealing rings.

[0015] The power taking method of the pure electric off-highway mine dump truck double hydraulic pump comprises:

[0016] Two hydraulic pumps are connected on the motor flanges at the two ends of the power taking motor, and the two hydraulic pumps are connected with a high-power hydraulic steering system, a double-cylinder multi-stage carriage lifting system and an oil-cooled disc brake system through hydraulic pipelines; one of the two hydraulic pumps is a steering pump, and the other is a lifting and disc brake dual pump;

[0017] When steering and escaping are needed, the two hydraulic pumps take power from the power taking motor at the same time, and the power taking motor provides power for the oil-cooled disc brake system, the double-cylinder multi-stage carriage lifting system and the high-power hydraulic steering system at the same time.

[0018] Preferably, a flange fixing bolt is connected on the shell threaded hole through the flange fixing through hole, and the two motor flanges are connected at the two ends of the motor shell; the steering pump rotor and the dual pump gear are connected at the two ends of the motor rotor through spline connection; the steering pump shell and the dual pump shell are installed on the steering pump rotor and the dual pump gear respectively, the dual pump fixed bolt is connected on the flange threaded hole through the dual pump fixed through hole, and the end of the dual pump shell is connected on the motor flange; the steering pump fixed bolt is connected on the flange threaded hole through the steering pump fixed through hole, and the end of the steering pump shell is connected on the motor flange; the flange connecting bolt is connected on the side threaded hole through the fixed plate through hole, and the fixed plate is connected between the two motor flanges; after the power taking motor and the hydraulic pump are assembled, the power taking motor and the hydraulic pump are hoisted to the mounting position of the vehicle frame by using hoisting equipment, and the assembly bolt is connected on the vehicle frame through the vehicle frame through hole and the fixed plate through hole; the steering pump is connected with the high-power hydraulic steering system through the hydraulic pipeline, and provides power for the high-power hydraulic steering system; the lifting and disc brake dual pump is connected with the double-cylinder multi-stage carriage lifting system and the oil-cooled disc brake system through the hydraulic pipeline respectively, and provides power for the double-cylinder multi-stage carriage lifting system and the oil-cooled disc brake system.

[0019] The technical effects of the present application include:

[0020] 1. The dual hydraulic pump power take-off mechanism of the pure electric off-highway mining dump truck of the present invention can simultaneously meet the power take-off of two high-power hydraulic pumps, avoiding the technical defect that the two high-power hydraulic pumps need to be equipped with separate power sources.

[0021] On pure electric off-highway mining dump trucks, the power take-off motor simultaneously powers the steering pump and the lifting and disc brake dual pump, enabling simultaneous power supply to the oil-cooled disc brake system, the dual-cylinder multi-stage cargo box lifting system, and the high-power hydraulic steering system. This results in higher vehicle safety, more direct power output, and meets the technical requirements for high steering power.

[0022] 2. This invention uses a single power take-off motor to simultaneously power the steering pump, lifting pump, and disc brake pump, effectively utilizing the layout space and solving the technical requirement of using two high-power hydraulic pumps in a confined space. Attached Figure Description

[0023] Figure 1 This is a layout diagram of the dual hydraulic pump power take-off mechanism of the pure electric off-highway mining dump truck in this invention;

[0024] Figure 2 This is a schematic diagram showing the connection between the lifting and disc brake dual pump and the power take-off motor in this invention;

[0025] Figure 3 This is a schematic diagram of the connection between the steering pump and the power take-off motor in this invention. Detailed Implementation

[0026] The following description fully illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce them.

[0027] like Figure 1 The diagram shown is a layout of the dual hydraulic pump power take-off mechanism of the pure electric off-highway mining dump truck in this invention.

[0028] The pure electric off-highway mining dump truck has a dual hydraulic pump power take-off mechanism, which includes a power take-off motor 1 and two hydraulic pumps 2, with the two hydraulic pumps 2 respectively connected to both ends of the power take-off motor 1; the rotating shaft of the hydraulic pump 2 is rigidly connected to the rotating shaft of the power take-off motor 1.

[0029] like Figure 2 The diagram shown is a schematic diagram of the connection between the lifting and disc brake dual pump 22 and the power take-off motor 1 in this invention.

[0030] In the embodiment of the present application, one of the two hydraulic pumps 2 is a steering pump 21, and the other is a lifting and disc brake duplex pump 22. In the present application, the lifting and disc brake duplex pump 22 and the steering pump 21 are respectively installed at the two ends of the motor rotor of the power take-off motor 1. One power take-off motor 1 can be used to simultaneously take power for the lifting and disc brake duplex pump 22 and the steering pump 21, meet the requirement of simultaneous operation of the lifting and disc brake duplex pump 22 and the steering pump 21, improve the space utilization of the frame, reduce the number of motors and motor auxiliary equipment, effectively reduce the cost of the whole vehicle and simplify the vehicle control system, and shorten the vehicle design and development cycle.

[0031] The power take-off motor 1 comprises a motor shell 11, a motor flange 12, a motor rotor and a motor stator. The motor shell 11 is provided with a plurality of shell threaded holes at the end portions. The motor flange 12 is provided with a rotor through hole in the middle portion, a plurality of flange threaded holes outside the rotor through hole, and a flange fixing through hole outside the flange threaded hole. The flange fixing bolt 124 is connected to the shell threaded hole through the flange fixing through hole, and the two motor flanges 12 are connected to the two ends of the motor shell 11, respectively. The motor stator is fixed to the inner wall of the motor shell 11, and the motor rotor is sleeved in the rotor through hole at the two ends.

[0032] The motor shell 11 is provided with a wire sleeve 112 on the outer wall, which is used to lead out the wire. The motor flange 12 is connected with a lifting lug 111, which is used to install and fix the power take-off motor 1.

[0033] The motor flange 12 is provided with a plurality of connecting side edges 121 at the side edges, and the connecting side edges 121 are provided with a plurality of side edge threaded holes 122. The fixed plate 113 is provided with a plurality of fixed plate through holes 114, and the flange connecting bolt 115 is connected to the side edge threaded hole 122 through the fixed plate through hole 114. On the one hand, the fixed plate 113 strengthens the connection strength of the motor flanges 12 on the two sides of the motor shell 11, and on the other hand, the fixed plate through hole 114 can be used to fix the power take-off motor 1 on the frame.

[0034] The lifting and disc brake duplex pump 22 selects a gear pump, and the structure comprises a duplex pump shell 221, a duplex pump gear, the duplex pump gear is arranged inside the duplex pump shell 221, the side of the duplex pump shell 221 is provided with a duplex pump power output port 222 and a duplex pump input port 223, the end of the duplex pump shell 221 is provided with a duplex pump fixed end plate 224, the outer side of the duplex pump fixed end plate 224 is provided with a duplex pump fixed through hole, and the middle part is provided with a duplex pump gear through hole; the duplex pump fixing bolt 227 is connected to the flange threaded hole through the duplex pump fixed through hole, and the end of the duplex pump shell 221 is connected to the motor flange 12; the rotating shaft of the duplex pump gear extends out of the duplex pump gear through hole and is rigidly connected with the motor rotor.

[0035] The double-pump housing 221 is internally provided with a plurality of sealing grooves, and a sealing ring is arranged in the sealing groove. The rotating shaft of the double-pump gear is sleeved on the sealing ring, and a plurality of sealing rings are used for sealing to prevent hydraulic oil in the double-pump housing 221 from leaking.

[0036] The double-pump power output port 222 and the double-pump input port 223 are respectively provided with a double-pump pipeline connecting flange 225. The double-pump pipeline connecting flange 225 is provided with a pipeline connecting threaded hole 226, and the hydraulic pipeline is connected through the double-pump pipeline connecting flange 225. A sealing pad is arranged between the double-pump pipeline connecting flange 225 and the hydraulic oil output pipeline and the hydraulic oil input pipeline to prevent the hydraulic oil in the double-pump housing 221 from leaking.

[0037] As shown in Figure 3 Fig. 4 is a connection schematic diagram of the steering pump 21 and the power take-off motor 1 in the present application.

[0038] The steering pump 21 is a vane pump, and the structure comprises a steering pump housing 211 and a steering pump rotor. The steering pump rotor is arranged inside the steering pump housing 211. The side of the steering pump housing 211 is provided with a steering pump input port 212, and the top is provided with a steering pump power output end 213. The end of the steering pump housing 211 is provided with a steering pump fixed end plate 214. The outer side of the steering pump fixed end plate 214 is provided with a steering pump fixed through hole, and the middle is provided with a steering pump rotor through hole. The steering pump fixing bolt 215 passes through the steering pump fixed through hole and is connected to the flange threaded hole, so that the end of the steering pump housing 211 is connected to the motor flange 12. One end of the steering pump rotor is installed inside the steering pump housing 211, and the other end extends out of the steering pump rotor through hole and is rigidly connected with the motor rotor.

[0039] The steering pump power output end 213 and the steering pump input port 212 are connected to the hydraulic pipeline.

[0040] The steering pump housing 211 is internally provided with a plurality of sealing grooves, and a sealing ring is arranged in the sealing groove. The steering pump rotor is sleeved on the sealing ring, and a plurality of sealing rings are used for sealing to prevent hydraulic oil in the steering pump housing 211 from leaking.

[0041] The power take-off method of the pure electric off-highway mining dump truck double hydraulic pump is as follows:

[0042] Step 1: Connect the two hydraulic pumps 2 to the motor flanges 12 at both ends of the power take-off motor 1. The two hydraulic pumps 2 are connected to the high-power hydraulic steering system, the double-cylinder multi-stage truck cabin lifting system, and the oil-cooled disc brake system through the hydraulic pipeline.

[0043] The flange fixing bolt 124 is connected on the shell threaded hole through the flange fixing through hole, and the two motor flanges 12 are connected on the two ends of the motor shell 11 respectively; the steering pump rotor and the double pump gear are connected on the two ends of the motor rotor through the spline respectively; the steering pump shell 211 and the double pump shell 221 are installed on the steering pump rotor and the double pump gear respectively, the double pump fixing bolt 227 is connected on the flange threaded hole through the double pump fixing through hole, and the end of the double pump shell 221 is connected on the motor flange 12; the steering pump fixing bolt 215 is connected on the flange threaded hole through the steering pump fixing through hole, and the end of the steering pump shell 211 is connected on the motor flange 12; the two hydraulic pumps 2 are connected on the motor flanges 12 on the two ends of the power take-off motor 1, and the assembly of the hydraulic pump 2 and the power take-off motor 1 is completed.

[0044] The flange connecting bolt 115 is connected on the side threaded hole 122 through the fixing plate through hole 114, and the fixing plate 113 is connected between the two motor flanges 12; after the assembly of the power take-off motor 1 and the hydraulic pump 2 is completed, the power take-off motor 1 and the hydraulic pump 2 are hoisted to the mounting position of the vehicle frame by using hoisting equipment, and the assembly bolt is connected on the vehicle frame through the vehicle frame through hole and the fixing plate through hole 114.

[0045] The steering pump 21 is connected with the high-power hydraulic steering system through the hydraulic pipeline, and provides power for the high-power hydraulic steering system; the lifting and disc brake double pump 22 is connected with the double-cylinder multi-stage carriage lifting system and the oil-cooled disc brake system through the hydraulic pipeline respectively, and provides power for the double-cylinder multi-stage carriage lifting system and the oil-cooled disc brake system.

[0046] Step 2: when steering is needed to get out of trouble, the two hydraulic pumps 2 take power from the power take-off motor 1 at the same time, and the power take-off motor 1 provides power for the oil-cooled disc brake system, the double-cylinder multi-stage carriage lifting system and the high-power hydraulic steering system at the same time.

[0047] The output power of the power take-off motor 1 is directly transmitted to the two hydraulic pumps 2, which meets the technical requirement of large steering power.

[0048] The terms used in the present application are illustrative and exemplary, but not limiting terms. Since the present application can be embodied in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above examples are not limited to any of the above details, but should be interpreted broadly within the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pure electric off-highway mining dump truck dual hydraulic pump power take-off method, characterized in that: the power take-off mechanism comprises a power take-off motor and two hydraulic pumps, the two hydraulic pumps are connected at both ends of the power take-off motor, one of the two hydraulic pumps is a steering pump, and the other is a lifting and disc brake duplex pump; the power take-off motor comprises a motor shell, a motor flange, a motor rotor and a motor stator; the motor shell is provided with a plurality of shell threaded holes at the end portion, the motor flange is provided with a rotor through hole in the middle portion, a plurality of flange threaded holes are provided outside the rotor through hole, and a flange fixing through hole is provided outside the flange threaded hole; the flange fixing bolt is connected to the shell threaded hole through the flange fixing through hole, and the two motor flanges are connected at both ends of the motor shell; the motor stator is fixed to the inner wall of the motor shell, and the motor rotor is sleeved at both ends of the rotor through hole; the lifting and disc brake duplex pump selects a gear pump, which comprises a duplex pump shell and a duplex pump gear; the duplex pump gear is arranged inside the duplex pump shell, the side portion of the duplex pump shell is provided with a duplex pump power output port and a duplex pump input port, the end portion of the duplex pump shell is provided with a duplex pump fixed end plate, the outer side of the duplex pump fixed end plate is provided with a duplex pump fixing through hole, and the middle portion is provided with a duplex pump gear through hole; the duplex pump fixing bolt is connected to the flange threaded hole through the duplex pump fixing through hole, and the end portion of the duplex pump shell is connected to the motor flange; the rotating shaft of the duplex pump gear extends out of the duplex pump gear through hole and is rigidly connected with the motor rotor; the steering pump selects a vane pump, which comprises a steering pump shell and a steering pump rotor; the steering pump rotor is arranged inside the steering pump shell; the side portion of the steering pump shell is provided with a steering pump input port, the top portion is provided with a steering pump power output end, the end portion of the steering pump shell is provided with a steering pump fixed end plate, the outer side of the steering pump fixed end plate is provided with a steering pump fixing through hole, and the middle portion is provided with a steering pump rotor through hole; the steering pump fixing bolt is connected to the flange threaded hole through the steering pump fixing through hole; one end of the steering pump rotor is installed inside the steering pump shell, and the other end extends out of the steering pump rotor through hole and is rigidly connected with the motor rotor; the motor flange is provided with a plurality of connecting side edges at the side edge, and the connecting side edge is provided with a plurality of side edge threaded holes; the fixed plate is provided with a plurality of fixed plate through holes, and the flange connecting bolt is connected to the side edge threaded hole through the fixed plate through hole; a plurality of sealing grooves are arranged inside the duplex pump shell, a sealing ring is arranged in the sealing groove, and the rotating shaft of the duplex pump gear is sleeved on the sealing ring; a duplex pump pipeline connecting flange is arranged at the duplex pump power output port and the duplex pump input port, and the duplex pump pipeline connecting flange is provided with a pipeline connecting threaded hole; a plurality of sealing grooves are arranged inside the steering pump shell, a sealing ring is arranged in the sealing groove, and the steering pump rotor is sleeved on the sealing ring; the power take-off method comprises: Two hydraulic pumps are connected to the motor flanges at both ends of the power take-off motor, the flange fixing bolts are connected to the housing threaded holes through the flange fixing holes, and the two motor flanges are connected to the motor housing at both ends; the steering pump rotor and the duplex pump gear are connected to the motor rotor at both ends by means of spline connection; the steering pump housing and the duplex pump housing are installed on the steering pump rotor and the duplex pump gear respectively, the duplex pump fixing bolts are connected to the flange threaded holes through the duplex pump fixing holes, and the end of the duplex pump housing is connected to the motor flange; the steering pump fixing bolts are connected to the flange threaded holes through the steering pump fixing holes, and the end of the steering pump housing is connected to the motor flange; the flange connecting bolts are connected to the side threaded holes through the fixing plate holes, and the fixing plate is connected between the two motor flanges; after the power take-off motor and the hydraulic pump are assembled, the power take-off motor and the hydraulic pump are hoisted to the mounting position of the frame by using hoisting equipment, and the assembly bolts are connected to the frame through the frame holes and the fixing plate holes to connect the power take-off mechanism to the frame; Two hydraulic pumps are connected to the motor flanges at both ends of the power take-off motor, the flange fixing bolts are connected to the housing threaded holes through the flange fixing holes, and the two motor flanges are connected to the motor housing at both ends; the steering pump rotor and the duplex pump gear are connected to the motor rotor at both ends by means of spline connection; the steering pump housing and the duplex pump housing are installed on the steering pump rotor and the duplex pump gear respectively, the duplex pump fixing bolts are connected to the flange threaded holes through the duplex pump fixing holes, and the end of the duplex pump housing is connected to the motor flange; the steering pump fixing bolts are connected to the flange threaded holes through the steering pump fixing holes, and the end of the steering pump housing is connected to the motor flange; the flange connecting bolts are connected to the side threaded holes through the fixing plate holes, and the fixing plate is connected between the two motor flanges; after the power take-off motor and the hydraulic pump are assembled, the power take-off motor and the hydraulic pump are hoisted to the mounting position of the frame by using hoisting equipment, and the assembly bolts are connected to the frame through the frame holes and the fixing plate holes to connect the power take-off mechanism to the frame; Two hydraulic pumps are connected to the motor flanges at both ends of the power take-off motor, the flange fixing bolts are connected to the housing threaded holes through the flange fixing holes, and the two motor flanges are connected to the motor housing at both ends; the steering pump rotor and the duplex pump gear are connected to the motor rotor at both ends by means of spline connection; the steering pump housing and the duplex pump housing are installed on the steering pump rotor and the duplex pump gear respectively, the duplex pump fixing bolts are connected to the flange threaded holes through the duplex pump fixing holes, and the end of the duplex pump housing is connected to the motor flange; the steering pump fixing bolts are connected to the flange threaded holes through the steering pump fixing holes, and the end of the steering pump housing is connected to the motor flange; the flange connecting bolts are connected to the side threaded holes through the fixing plate holes, and the fixing plate is connected between the two motor flanges; after the power take-off motor and the hydraulic pump are assembled, the power take-off motor and the hydraulic pump are hoisted to the mounting position of the frame by using hoisting equipment, and the assembly bolts are connected to the frame through the frame holes and the fixing plate holes to connect the power take-off mechanism to the frame;

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