CN201521570U - Liquid viscous loading system - Google Patents

Abstract

A liquid viscous loading system suitable for applying load moments on rotating shafts at various speeds. It is mainly composed of a hydraulic control system and a liquid viscous loading device connected to the hydraulic control system; the hydraulic control system consists of a motor, a double pump, an electro-hydraulic proportional relief valve, an electromagnetic reversing valve, a filter, a pressure detection element, a pressure gauge and oil tank etc.; the liquid viscous loading device is composed of input shaft, piston, outer friction plate, inner friction plate, return spring, casing, end cover, sealing cover, sealing components, etc.; using the viscosity or shear force of the oil film between the friction plates Transmission of power, by changing the thickness of the oil film to adjust the speed of the loading torque, and through the motor to drive the double pump to connect with the liquid viscous loading device to form a lubricating oil passage, through the electromagnetic reversing valve, proportional relief valve, etc. to control the flow of lubricating oil Pressure and control the size of loading torque; the system has simple structure, stable loading, long service life, convenient operation and good effect.

Description

liquid viscous loading system

technical field

The utility model relates to a loading system, in particular to a liquid viscous loading system suitable for applying load moments on rotating shafts at various speeds.

Background technique

Commonly used torque loading methods mainly include: mechanical loading, hydraulic loading, hydraulic loading, electric loading, hydraulic dynamometer loading, etc. The main characteristics are as follows:

(1) Mechanical loading: Among many mechanical loading methods, the advantages of disc brakes are the most obvious. Disc loading is through the friction between the brake disc and the disc brake lining, so as to obtain the corresponding braking torque. The advantages of disc loading are: compact structure, low cost, mature technology, and easy implementation; the main disadvantages are: ①The brake disc has poor heat dissipation performance; question.

(2) Hydraulic loading: Hydraulic loading is to take throttling or overflow measures on the hydraulic pump to make it discharge oil under a certain pressure, thereby generating braking torque on the belt conveyor connected to it. The braking torque can be adjusted by changing the flow and pressure of oil discharge. The main disadvantages of the hydraulic braking system are: ①This braking method has good low-speed performance, but still needs a set of mechanical brakes to stop; ②The heat energy converted from hydraulic energy needs to be cooled by a separate cooling system; ③There are many control valves , The hydraulic system is complex and difficult to operate and maintain.

(3) Hydraulic loading: The main body of hydraulic loading is a hydraulic brake, and its rotor shaft is connected with the high-speed shaft of the belt conveyor reducer. When the conveyor is running normally, the working chamber of the hydraulic brake is not filled with liquid, and the working chamber is continuously filled with liquid when braking. The rotor and the stator interact with the working fluid to make the reaction force of the rotor rectangular to the belt conveyor. dynamic moment. The main disadvantages of the hydraulic brake system are: ① When the speed drops, the braking torque drops sharply. When it drops to 1/3 of the working speed, the brake basically fails, and a mechanical brake is required to stop the brake, which will cause mechanical shock and damage. The brake lining is worn; ②When braking, the energy absorbed by the transmission medium is converted into heat, which requires a cooling system, and it is not suitable to use hard water in the underground; The braking process takes a long time; ④The brake system is difficult to operate and maintain.

(4) Electric loading: The electric loading device mainly includes electric dynamometer, eddy current dynamometer and magnetic powder loader. Electric loading has the advantages of stable operation, easy control, and high loading accuracy. In particular, using a generator as a loading device can convert mechanical energy into electrical energy and feed it back to the prime mover, realizing energy recovery. However, it belongs to energy-consumption braking, which has high energy consumption, difficult to solve heat dissipation problems, and the electronic control system required for loading is very complicated and expensive.

(5) Hydraulic dynamometer loading: Hydraulic dynamometer loading is gradually eliminated due to its testing and control accuracy, operation, service life, dynamic response time and many other issues.

The above loading methods all have the disadvantages of unstable loading, short service life, inconvenient operation, and complex structure, so it is necessary to improve them.

Contents of the invention

Technical problem: The purpose of this utility model is to overcome the deficiencies in the prior art and provide a liquid viscous loading system with simple system, stable loading, long service life and convenient operation.

Technical solution: The liquid viscous loading system of the utility model is composed of a hydraulic control system connected with the motor and a liquid viscous loading device connected with the hydraulic control system. The hydraulic control system includes a double pump connected with the fuel tank. The left side of the double pump The output end of the pump is equipped with a pressure gauge and an electro-hydraulic proportional overflow valve connected to the oil tank. The left pump of the double pump is connected to the lubricating oil inlet of the liquid viscous loading device through pipeline B; the output end of the right pump of the double pump is respectively equipped with pressure The meter, the pressure detection element and the electro-hydraulic proportional overflow valve connected to the oil tank, the right pump output pipeline of the double pump is equipped with an electromagnetic reversing valve, and the electromagnetic reversing valve is connected to the oil hole of the loading device through pipeline A;

The liquid viscous loading device includes a casing, a left end cover and a sealing cover fixed at both ends of the casing, a right end cover is arranged on the sealing cover, an input shaft is arranged on the left end cover and the sealing cover, and one end of the input shaft passes through the sealing cover and the right end cover, and the input shaft The shaft section on the side of the left end cover is provided with an axial hole communicating with the lubricating oil inlet and a plurality of radial holes communicating with the axial hole. The shaft section is provided with an outer friction plate and an inner friction plate stacked alternately. There is a lubricating oil outlet connected to the oil tank through the pipeline C, and a piston with a groove in contact with the friction plate is arranged on the inner side of the sealing cover, and a reset spring that fits the sealing cover is provided in the groove of the piston, and the sealing cover There are oil holes.

A coarse filter is provided at the entrance of the duplex pump connected to the fuel tank; a fine filter is provided at the right pump outlet of the duplex pump; the outer friction plate is fixed by a pin shaft; the inner friction plate is connected to the The input shaft is connected by spline plugging; the pipeline C connecting the lubricating oil outlet to the oil tank is provided with a coarse filter; the pressure detection element is a pressure sensor, a pressure transmitter, a pressure relay or an electric contact pressure gauge .

Beneficial effects: the viscosity or shearing force of the oil film between the friction plates is used to transmit power, and the magnitude of the loading moment is adjusted by changing the thickness of the oil film. During the working process, the friction plate is always soaked in the coolant, and the heat generated is brought back to the fuel tank by the coolant, so there will be no sparking phenomenon, and it has the function of explosion-proof, and the friction plate transmits power by the shear force of the oil film, which is not easy to be damaged. Long service life; the hydraulic control system is mainly composed of two electro-hydraulic proportional overflow valves and an electromagnetic reversing valve, with few hydraulic components, low failure rate and easy maintenance; The purpose of stable loading can be achieved by controlling the pressure of the flow valve; the system has simple structure, stable loading, long service life, few hydraulic parts, convenient operation and maintenance, good use effect, and wide practicability.

Description of drawings

Fig. 1 is a structural schematic diagram of the liquid viscous loading system of the present invention.

Fig. 2 is a structural diagram of the liquid viscous loading device of the present invention.

In Figure 1: 1. Motor, 2. Fine filter, 3, 8. Electro-hydraulic proportional overflow valve, 4, 13. Pressure gauge, 5. Pressure detection element, 6. Electromagnetic reversing valve, 7. Liquid viscous loading Device 9. Duplex gear pump, 10, 12. Coarse filter, 11. Fuel tank.

In Fig. 2: 7-1. input shaft, 7-2. lubricating oil inlet, 7-3. radial hole, 7-4. outer friction plate, 7-5. inner friction plate, 7-6. pin shaft, 7-7. Shell, 7-8. Lubricating oil outlet, 7-9. Sealing cover II, 7-10. Control oil port, 7-11, 7-13 Sealing assembly, 7-12. Right end cover, 7-14 . Piston, 7-15. Return spring, 7-16. Left end cap.

Detailed ways

An embodiment of the present utility model is further described below in conjunction with accompanying drawing:

As shown in Figure 1, the liquid viscous loading system is mainly composed of a hydraulic control system and a liquid viscous loading device. The composition of the hydraulic control system: the motor 1 is connected to the double pump 9, the inlet of the double pump 9 is connected to the oil tank 11 through the coarse filter 12, and the double The outlet of the left pump of the joint pump 9 is connected with the electro-hydraulic proportional overflow valve 8 and the pressure gauge 13, and the lubricating oil inlet 7-2 of the liquid viscous loading device 7 is connected through the pipeline B, and the lubricating oil outlet 7-8 of the liquid viscous loading device 7 The pipeline C and the coarse filter 10 are connected to the oil tank 11 to form a lubricating passage; the electro-hydraulic proportional overflow valve 8 controls the pressure of the lubricating oil, and the outlet of the right pump of the double pump 9 passes through the fine filter 2 and the electro-hydraulic proportional overflow valve 3 is connected to the pressure gauge 4 and the pressure detection element 5, and then connected to the control oil port 7-10 of the liquid viscous loading device 7 through the electromagnetic reversing valve 6 and the pipeline A. The electromagnetic reversing valve 6 is in the left valve position when the power is off , the system is in the loading state at this time, the electro-hydraulic proportional relief valve 3 can control the magnitude of the loading torque, when the electromagnetic reversing valve 6 is energized, it is in the right valve position, and the system is in the unloading state. A coarse filter 12 is provided. The pressure detecting element 5 is a pressure sensor, a pressure transmitter, a pressure relay or an electric contact pressure gauge.

As shown in Figure 2, the composition of the liquid viscous loading device: the two ends of the shell 7-7 are screwed with a left end cover 7-16 and a sealing cover 7-9, the outer end of the sealing cover 7-9 is provided with a right end cover 7-12, and the input shaft 7-1 is respectively arranged on the left end cover 7-16 and the sealing cover 7-9 through the bearing, and the input shaft 7-1 starts from the inside of the left end cover 7-16, passes through the sealing cover 7-9 and the right end cover 7-12, and the left end There is a lubricating oil inlet 7-2 on the cover 7-16, and a lubricating oil outlet 7-8 is opened on the casing 7-7, which is connected to the oil tank 11 through the pipeline C; the input shaft 7-1 is close to the left end cover 7-16 The shaft section on one side is provided with a shaft center hole communicating with the lubricating oil inlet 7-2 and a plurality of radial holes 7-3 communicating with the shaft center hole. The shaft section is provided with an outer friction plate 7-4 and an inner friction plate 7-5, the outer friction plate 7-4 and the inner friction plate 7-5 are stacked alternately, and the outer friction plate 7-4 is fixed on the left end cover 7-16 and the sealing cover 7-9 through the pin shaft 7-6, or It is fixed by matching with the groove of the inner wall of the shell 7-7. The inner friction plate 7-5 is connected with the spline between the input shaft 7-1, and can also be matched with the chute between the input shaft 7-1. The inner side of the sealing cover 7-9 is provided with a piston 7-14 with a groove in contact with the friction plate, and the groove of the piston 7-14 is provided with a return spring 7-15 fitted with the sealing cover 7-9, Oil through hole 7-10 is arranged on sealing cover 7-9.

Working principle: The double gear pump 9 is driven by the motor 1, the left pump outlet of the double gear pump 9 is connected with the electro-hydraulic proportional overflow valve 8 and the pressure gauge 13, and then connected to the lubricating oil inlet 7 of the liquid viscous loading device through the pipeline B -2, the lubricating oil outlet 7-8 of the liquid viscous loading device is connected to the oil tank 11 through the pipeline C and the coarse filter 10 to form a lubricating oil passage, and the pressure of the lubricating oil is controlled by a proportional valve; double gear pump 9 right pump The outlet is connected to the electro-hydraulic proportional overflow valve 3, pressure gauge 4, and pressure detection element 5 through the fine filter 2, and then connected to the control oil port 7-9 of the liquid viscous loading device through the electromagnetic reversing valve 6 and pipeline A. Control the loading torque to achieve smooth loading.

Claims (7)

1. A liquid viscous loading system, characterized in that: it is composed of a hydraulic control system connected to the motor (1) and a liquid viscous loading device (7) connected to the hydraulic control system; the hydraulic control system includes a fuel tank (11) Connected double pumps (9), the output end of the left pump of the double pump (9) is provided with a pressure gauge (13) and an electro-hydraulic proportional overflow valve (8) connected with the oil tank (11), the double pump ( 9) The left pump is connected to the lubricating oil inlet (7-2) of the liquid viscous loading device (7) through pipeline B; the output end of the right pump of the double pump (9) is respectively equipped with a pressure gauge (4) and a pressure detection element (5 ) and the electro-hydraulic proportional overflow valve (3) connected with the oil tank (11), the double pump (9) is equipped with an electromagnetic reversing valve (6) on the output pipeline of the right pump, and the electromagnetic reversing valve (6) passes through the pipeline A is connected to the oil through hole (7-10) of the liquid viscous loading device (7); The liquid viscous loading device (7) comprises a shell (7-7), a left end cover (7-16) and a sealing cover (7-9) fixed on the two ends of the shell (7-7), and the sealing cover (7-9) is provided with There is a right end cover (7-12), an input shaft (7-1) is arranged on the left end cover (7-16) and the sealing cover (7-9), and one end of the input shaft (7-1) passes through the sealing cover (7- 9) and the right end cover (7-12), the shaft section of the input shaft (7-1) near the left end cover (7-16) has an axis hole communicating with the lubricating oil inlet (7-2) and the shaft center There are a plurality of radial holes (7-3) connected by the holes, and the outer friction plate (7-4) and the inner friction plate (7-5) stacked alternately are arranged on the shaft section, and the outer friction plate (7-7) is provided with There is a lubricating oil outlet (7-8) connected to the oil tank (11) through the pipeline C, a piston (7-14) with a groove in contact with the friction plate is arranged on the inner side of the sealing cover (7-9), and the piston (7-14) -14) is provided with the return spring (7-15) that fits with seal cover (7-9) in the groove, and oil through hole (7-10) is arranged on seal cover (7-9). 2. The liquid viscous loading system according to claim 1, characterized in that: a coarse filter (12) is provided at the inlet of the double pump (9) connected to the oil tank (11). 3. The liquid viscous loading system according to claim 1, characterized in that: the right pump output port of the double pump (9) is provided with a fine filter (2). 4. The liquid viscous loading system according to claim 1, characterized in that: the outer friction plate (7-4) is fixed by a pin shaft (7-6). 5. The liquid viscous loading system according to claim 1, characterized in that: the inner friction plate (7-5) is connected to the input shaft (7-1) by spline insertion. 6. The liquid viscous loading system according to claim 1, characterized in that: a coarse filter (10) is provided on the pipeline C connecting the lubricating oil outlet (7-8) to the oil tank (11). 7. The liquid viscous loading system according to claim 1, characterized in that: the pressure detecting element (5) is a pressure sensor, a pressure transmitter, a pressure relay or an electric contact pressure gauge.

Images