RU2116630C1 - Gear determining weight of transport vehicles - Google Patents

Abstract

FIELD: weight measurement equipment. SUBSTANCE: gear is related to weight measuring equipment and is intended to weigh transport vehicles without their stopping on horizontal section of track. Weight-lifting unit of gear is manufactured in the form of hydraulic lifting device that includes supporting frame with pulling device, thrust and power bearings, pressure transducer. Power bearing includes piston with rod and pressure chamber. Measurement unit of gear has multiplexer, analog-to-digital converter, microprocessor, control unit, indicator, matching unit and power supply unit. Gear displays improved operational characteristics thanks to simplicity of its design. EFFECT: improved operational characteristics. 3 dwg

Description

 The invention relates to weighing equipment and can be used to weigh vehicles with stopping them on a horizontal section of the track (on railways, stations, access roads of enterprises).

 Known commodity platform mobile scales company Sauter (Germany), in which a strain gauge sensor is used as a load measuring device. A microprocessor is used to convert the primary signal from the sensor. As a reading device, a digital display is used. It is possible to transfer data on weighing results to an automated control system (ACS).

 Commodity scales of the company Toledo Werk Gmbh (Germany) are known, in which a strain gauge sensor is used as a force measuring device, and hardware logic is used to convert the received primary signal of the sensor.

 A device for controlling the mass of a cargo of a vehicle (ed. St. USSR N 1550328 dated 03.15.90, G 01 G 19/08), in which the mass sensors of the load generate voltage signals, which are then converted using voltage-frequency converters. The device also contains a frequency meter, registers, indicator, interface unit, microprocessor, memory unit, etc.

 A device for axial weighing of moving objects (ed. St. USSR N 1702185 from 12.30.91, G 01 G 19/04), containing two load-bearing units that rely on load cells. The measuring part of the device contains an auto-compensator, a recording device, a distributor key, a delay counter-shaper, and logic elements. The device also contains an identification unit, which includes a measurement counter, AND elements, a decoder, a key, a trigger, an inverter.

 A device is known for wheel-based weighing of objects, containing load-bearing units based on load cells, input units, a key circuit, an analog-to-digital converter, a computing unit, communication buses, a processor, a storage device, an interface, a recording device, a switch-former (ed. St. USSR N 1408234 from 07.07.88, G 01 G 19/04).

 A device for controlling the mass of the load, containing the number of sensors equal to the number of wheels of the vehicle, and the same number of voltage-frequency converters, frequency counter, microprocessor, interface unit, memory unit, restart unit, memory protection unit, signaling devices, scoreboards, registers, indicator , counters pulse shaper, high-frequency generator, key switches, for each mass sensor: frequency divider, modulator, key (ed. St. USSR N 1550328 of 03.15.90, G 01 G 19/08 - prototype).

 Known devices for determining the mass of vehicles are quite complex and cumbersome.

 The aim of the invention is to improve the operating conditions of the device.

 A known jack for rolling stock company EFaG (France), which can be moved by the force of one worker. To install the jack in the working position does not require a special foundation. The jack lifts the carriage of the rolling stock body due to the large supporting part (RZ VINITI "Railway Transport", 1994, N 11, 11B47).

 Known automatic measurement system (ASI) of automobile cargo Volwo BM (Sweden), having a hydraulic drive device with a power mechanism of the piston-cylinder type. ASI contains a pressure sensor, a control system and information processing (RZ VINITI, "Metrology and measuring equipment", 1994, N 10, 10.32.187).

 A device for lifting loads containing a frame with supports and vertical guides in which is placed a lifting lever connected with a hydraulic cylinder (ed. St. USSR N 1673195 from 12.12.87, B 66 F 7/16).

 Known lifting device containing a base, a vertical frame mounted on the base, a lifting cylinder located between the vertical racks of the frame (ed. St. USSR N 1706961 from 31.07.89, B 66 F 7/04).

 The considered lifting devices solve a utilitarian task or are quite complicated, because require special equipment of the weighing platform or railway track.

 To achieve this goal, a lifting unit of the device is proposed, made in the form of a hydraulic lifting device, which includes: a support frame with a clamping device, a thrust bearing fixed to the frame, a power bearing, a pressure sensor, a piston with a rod and a pressure chamber are included in the power bearing . The lifting unit is also equipped with a hydraulic pump, gearbox and electric motor.

 The measuring unit of the device contains a multiplexer, ADC, microprocessor device, control unit, display unit, matching device, power supply.

 The load-lifting unit at the information output of the pressure sensor contains a pressure-voltage converter. The measuring unit at the information input contains an amplifier.

 In FIG. 1 shows a block-kinematic diagram of the device; figure 2 is a graph explaining the operation of the device; figure 3 is a structural diagram of a microprocessor computing device.

 In FIG. 1 shows: wagon wheel 1, frame 2 with a clamping device 3, rail 4, thrust bearing 5, power bearing 6 with piston 7 with rod and pressure chamber 8, pressure sensor 9, hydraulic pump 11, gearbox 12, safety and relief valves 13, an electric motor 14, a pressure-voltage converter 10, a measuring unit 15, which includes an amplifier 16, a multiplexer 17, an ADC 18, a matching device 19, an indication unit 20, a microprocessor device (MVU) 21, a control unit 22, a power supply 23.

 The structure of the MVU 21 (figure 3) includes the first RAM 24, the first ROM 25, the processor 26, the drive 27, the second ROM 28, the second RAM 29, the third ROM 30, bus 31, the registration interface 32, the input / output interface 33.

 The thrust bearing 5 and the power bearing 6 are mounted on the support frame 2 with the possibility of movement under the influence of the clamping device.

 The hydraulic lift is designed to lift the wheel 1 of the car until it comes off the rail 4. The moment of separation is determined by the measuring unit 15.

 The measuring unit 15 provides the analysis of the signal from the measuring sensor 9, the formation of measurement data, summing up the result, correction of the results taking into account the calibration characteristics and destabilizing factors with the conclusion of the results of measuring the weight of railway cars for registration.

 The principle of measuring the weight of the cargo is based on the measurement of pressure by a sensor 9 in the working cavity-chamber 8 of the pressure at the time of separation of the wheel 1 from the rail 4. To determine the mass of the cargo, the mass of the wheels of the car is sequentially determined and the weighing results are summed.

 The support frame 2 provides retention of the thrust bearings from the force of squeezing them out from under the wheel 1 of the horizontal component of the force and serves to secure the blocks included in the hydraulic lift.

 The thrust bearing is mounted on a rail 4 on the left side of the wheel 1.

 Power thrust bearing 6 is mounted on rail 4 on the right side of wheel 1.

 The hydraulic pump 11 consists of a piston pump with a drive and can be driven through a cam mechanism and gearbox 12 both from the DC motor 14 and manually from the handle.

 The output of the pressure sensor 9 through the converters 10 and the amplifier 16 is connected to the input of the multiplexer 17, the output of which through the ADC 18 is connected to the first digital input of the computing device 21, the second control input of which is connected to the output of the control unit 22, the first information output of the computing device 21 is connected to the information the input of the display unit 20, the second control output of the computing device 21 is connected to the control input of the control unit 22, and the third control output of the computing device 21 is connected to the input of the matching device 19, the output of which is the matching output measuring unit 15 outputs the second display unit 20, a matching device key 19, the control unit 22 and the third input of the calculation unit 21 are the inputs supply.

 A hydraulic lift is installed under the wheel 1 on the rail of the railway track. The thrust bearing 5 and the power bearing 6 are mounted on the rail 4 respectively on the left and right side of the wheel 1. Using the clamping device wrapping around the wheel 1, the thrust bearings 5 and 6 are pressed against the wheel 1.

 The device operates as follows. At the moment of turning on the electric motor 14 of the hydraulic pump drive 11, a pressure P is created in the pressure chamber 8 of the power bearing 6, which acts through the piston 7 with the rod on the wheel 1 of the car. The pressure sensor 9 generates pressure signals that are transmitted through the converter 10 and amplifier 16 to the first input of the multiplexer 17, then the ADC 18 is converted to a digital value and, through the data input / output interface 33, is entered into the first random access memory (RAM) 24 of the microprocessor device 21 through tires 31.

 The control unit 22 gives the command "MEASUREMENT", which is fed to the first input of the microprocessor computing device 21, which starts to execute the program embedded in the first read-only memory (ROM) 25. The derivative of the parameters of the pressure sensor 9 (figure 2) is calculated by the processor 26 using the average values. A predetermined number of measurements of the signals of the pressure sensor 9 is carried out, which is displayed on the display unit 20 via the registration interface 32. The measurement results are accumulated in the drive 27 in the form of an array of data, after which the processor 26 calculates the derivative of the accumulated series of values. The derivative is calculated by the processor 26 until its value becomes less than the set threshold level stored in the second ROM 28, after which the control unit 22 issues the command “DISABLING THE ELECTRIC MOTOR” 14, which through the matching device 19 is fed to the input of the electric motor 14. Through a certain time after turning off the electric motor 14 (approximately 2 s), necessary to complete the transient processes in the measuring system, hydraulic system and suspension of the wagon wheel, the indication unit 20 is fixed 9 ix pressure sensor pressure. In the first RAM 24, n pressure values are accumulated, which is averaged.

 According to the calibration characteristic stored in the third ROM 30, determine the value of the weight of the wheel 1 corresponding to the measured pressure at the time of shutdown of the motor 14.

 The control unit 22 issues a “CALCULATION” command to the processor 26. The value of the weight of the wheel 1 is entered in the second RAM 29. The weight of all the wheels of the car is similarly measured, the weight of the wheels is added up and this value is output to the display unit 20.

 Calibration characteristics are calculated as the ratio of the pressure in the hydraulic chamber, taken from the output of the pressure sensor 9 and the ADC signals 18.

 An example of a specific implementation. The pressure sensor 9 is a strain gauge sensor. Power thrust bearing 6 is made in the form of a truncated cylinder. The clamping device of the support frame 2 is a closed design of levers coupled by rods, articulated units and a tightening sleeve. The rotation of the sleeve handle creates a preliminary preload of the bearings 5 and 6.

 The display unit 20 is an eight-digit seven-segment indicator.

 The control unit 22 can be implemented as a control board Micro PC 6012-IMB (Octagon systems - USA) and is a single-board PC XT microcomputer with an additional integrated 12-bit ADC.

 The power supply unit 23 contains voltage converters NPC10-12S05-4 and NFC10-12D12-4 (Computer products), an alarm circuit for lowering the battery voltage, a circuit for disconnecting the power supply when the battery voltage is unacceptably low.

 Key matching device 19 is made in the form of a power transistor switch, through which the supply voltage is supplied to the electric motor 14.

Claims (1)

 A device for determining the weight of the vehicle, comprising a lifting unit with a measurement sensor and a measuring unit, which includes an indication unit, a microprocessor computing device and a control unit, the first input of the microprocessor computing device being connected to the output of the control unit, the first information output to the first input the display unit, and the second output with the first input of the control unit, characterized in that the lifting unit is made in the form of a hydraulic lift, in the remainder of which includes a support frame with a clamping device, a thrust bearing, a power thrust bearing, which is a pressure chamber with a rod, a hydraulic pump, the power and thrust bearings and a coupling device are mounted on the support frame with the possibility of movement, the measurement sensor is made in the form of a pressure sensor, in the unit an amplifier, a multiplexer, an ADC and a power supply are introduced, the input of the pressure sensor connected to the output of the pressure chamber of the power thrust bearing, the output of the pressure sensor through a pressure-voltage converter , the amplifier is connected to the input of the multiplexer, the output of which through the ADC is connected to the second input of the microprocessor computing device, the third input of which is connected to the first input of the matching device, the output of which is the output of the measuring unit and connected to the input of the electric motor, the second inputs of the control unit, display unit and matching devices and the third input of the microprocessor computing device are the power input.

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