CN206111743U - Hydraulic pressure fastener and hydraulic pressure fastener's control system - Google Patents

Abstract

The utility model relates to a hydraulic pressure fastener and hydraulic pressure fastener's control system. Hydraulic pressure fastener's control system is still including magenetic exchange valve and ooff valve, the pressure sensor who gathers the inlet pressure of pneumatic cylinder who is used for the connection on the oil circuit of pneumatic cylinder, torque sensor and the controller of gathering hydraulic pressure fastener's output torque, pressure sensor, torque sensor are connected with controller signal, switching -over valve, ooff valve and controller control connection, the transposition of switching -over valve, two stations first through its is to the business turn over direction switching of oil circuit with the piston rod of control pneumatic cylinder pressurizeed output power or release return, the signal control magenetic exchange valve that the controller provided according to pressure sensor, the signal control switch valve that the controller provided according to torque sensor. Realized need not artifically relapseing the start -up operation by the automatic control to the pneumatic cylinder through control system, work efficiency is high.

Description

Control systems for hydraulic fastening devices and hydraulic fastening devices

technical field

The utility model belongs to the technical field of mechanical devices, in particular to a hydraulic fastening device and a control system for the hydraulic fastening device.

Background technique

In the bolt fastening and dismounting operations of some large-scale equipment, the specifications of the bolts are relatively large, and a hydraulic torque wrench combined with a hydraulic control system is usually used to realize the tightening and dismounting of the bolts. The hydraulic torque wrench includes a hydraulic cylinder, a rocker arm and a working head connected to the drive of the rocker arm. The hydraulic cylinder has a piston rod for driving the rocker arm to rotate. When working, press the control button that controls the operation of the hydraulic pump until the oil inlet pressure of the hydraulic cylinder reaches the predetermined pressure, the hydraulic pump drives the piston rod of the hydraulic cylinder to complete a working stroke, and drives the working head through the rocker arm to achieve a limited angle Rotary movement, and then release the control button, the hydraulic system is relieved, and the piston rod returns under the action of the return spring. The hydraulic cylinder works repeatedly for multiple working strokes until the working head cannot rotate under the predetermined pressure, at this time the pre-tightening of the bolts is completed. Each working stroke of the hydraulic cylinder needs to press and release the control button. Therefore, every time a bolt is pre-tightened, the control button must be pressed and released several times to make the bolt reach the pre-tightening torque value. The manual operation is cumbersome and the work efficiency is low.

Utility model content

The purpose of the utility model is to provide a control system of a hydraulic fastening device with simple operation and high working efficiency. The purpose of the utility model is also to provide a hydraulic fastening device.

In order to achieve the above purpose, the technical solution of the control system of the hydraulic fastening device of the present invention is: the control system of the hydraulic fastening device, which is characterized in that it includes an electromagnetic A reversing valve and a switching valve, a pressure sensor for collecting the oil inlet pressure of the hydraulic cylinder, a torque sensor and a controller for collecting the output torque of the hydraulic fastening device, the pressure sensor and the torque sensor are connected to the controller signal, and the electromagnetic switch The directional valve and the switching valve are connected to the controller; the electromagnetic directional valve switches the direction of the oil circuit through the first and second positions of the electromagnetic directional valve to control the piston rod of the hydraulic cylinder to be pressurized to output power or relieve pressure. return; the controller controls the electromagnetic reversing valve according to the signal provided by the pressure sensor: when the oil inlet pressure of the hydraulic cylinder is less than the set value, it is in the first position; The station is switched to the second station; the controller controls the switch valve according to the signal provided by the torque sensor: when the torque is less than the set value, open the oil supply to the hydraulic cylinder, and cut off the oil supply to the hydraulic cylinder when the torque reaches the set value .

The controller includes a relay with a detection feedback unit, the relay includes a pressure relay and an intermediate relay, the pressure relay has a pressure acquisition module for collecting the oil inlet pressure of the hydraulic cylinder, the pressure acquisition module constitutes the pressure sensor, the pressure of the pressure relay The acquisition module is connected to the signal detection feedback unit of the pressure relay, the torque sensor is connected to the signal detection feedback unit of the intermediate relay, the pressure relay is connected to the control of the electromagnetic reversing valve, and the intermediate relay is connected to the control valve of the switching valve.

The electromagnetic reversing valve has two working ports, one oil inlet and one oil return port. The two working ports of the electromagnetic reversing valve are respectively used to connect with the rod cavity and the rodless cavity of the hydraulic cylinder through the oil circuit. The oil inlet of the directional valve is connected with an oil inlet pipeline, and the oil outlet of the electromagnetic directional valve is connected with an oil return pipeline.

In order to achieve the above object, the technical solution of the hydraulic fastening device of the present utility model is: the hydraulic fastening device includes a hydraulic torque wrench and a control system of the hydraulic fastening device, and the hydraulic torque wrench includes a rocker arm and a working gear connected to the rocker arm transmission. The hydraulic torque wrench also includes a hydraulic cylinder. The hydraulic cylinder has a rod chamber and a rodless chamber. The hydraulic cylinder has a piston rod for pushing the rocker arm to rotate. It is characterized in that the control system of the hydraulic fastening device also includes a connection The electromagnetic reversing valve and switch valve on the oil circuit of the hydraulic cylinder, the pressure sensor for collecting the oil inlet pressure of the hydraulic cylinder, the torque sensor and the controller for collecting the output torque of the hydraulic fastening device, the pressure sensor, the torque sensor and the control The reversing valve and the switch valve are connected to the controller for control; the reversing valve switches the direction of the oil passage through the first and second positions of the reversing valve to control the piston rod of the hydraulic cylinder to be loaded. Pressure output power or pressure relief return; the controller controls the electromagnetic reversing valve according to the signal provided by the pressure sensor: when the oil inlet pressure of the hydraulic cylinder is less than the set value, it is in the first position; when the oil inlet pressure of the hydraulic cylinder reaches the set value When the value is set, switch from the first station to the second station; the controller controls the on-off valve according to the signal provided by the torque sensor: when the torque is less than the set value, it opens to supply oil to the hydraulic cylinder; when the torque reaches the set value Cut off the oil supply to the hydraulic cylinder.

The controller includes a relay with a detection feedback unit, the relay includes a pressure relay and an intermediate relay, the pressure relay has a pressure acquisition module for collecting the oil inlet pressure of the hydraulic cylinder, the pressure acquisition module constitutes the pressure sensor, the pressure of the pressure relay The acquisition module is connected to the signal detection feedback unit of the pressure relay, the torque sensor is connected to the signal detection feedback unit of the intermediate relay, the pressure relay is connected to the control of the electromagnetic reversing valve, and the intermediate relay is connected to the control valve of the switching valve.

The electromagnetic reversing valve has two working ports, one oil inlet and one oil return port. The two working ports of the electromagnetic reversing valve are respectively connected with the rod chamber and the rodless chamber of the hydraulic cylinder through the oil circuit. The electromagnetic reversing valve The oil inlet of the valve is connected with an oil inlet pipeline, and the oil outlet of the electromagnetic reversing valve is connected with an oil return pipeline.

A return spring for resetting the piston rod is provided in the rodless chamber of the hydraulic cylinder.

The beneficial effects of the utility model are: when the pressure value of the pressure sensor does not reach the set value, the hydraulic cylinder is in the first station, oil is fed into the rod cavity of the hydraulic cylinder, and the piston rod outputs power to push the working head to rotate. When the pressure value of the pressure sensor reaches the set value, the controller controls the electromagnetic reversing valve to reversing, the electromagnetic reversing valve is switched from the first station to the second station, the rod cavity of the hydraulic cylinder is relieved, and the piston rod returns to the original position. , the hydraulic cylinder completes a working stroke, and at the same time the oil inlet pressure of the hydraulic cylinder drops, the controller controls the solenoid valve to switch from the second station to the first station, and starts the next working stroke, and so on, until the value detected by the torque sensor When the set value is reached, the controller controls the on-off valve to cut off the oil supply to the hydraulic cylinder, and the automatic control of the hydraulic cylinder is realized through the control system, without manually starting the hydraulic cylinder repeatedly. The operation is simple and the work efficiency is high.

Description of drawings

Fig. 1 is the control schematic diagram of the control system of hydraulic fastening device in the utility model;

Fig. 2 is the hydraulic system diagram of the control system of the hydraulic fastening device in the utility model;

Fig. 3 is the electrical system diagram of the control system of the hydraulic fastening device in the utility model;

Fig. 4 is the main circuit diagram of the control system of the hydraulic fastening device in the utility model;

Fig. 5 is a control flowchart of the hydraulic fastening device in the utility model.

In the figure: 1. Fuel tank; 2. Filter; 3. Motor; 4. Hydraulic pump; 5. Pressure gauge; 6. Torque sensor; 7. Hydraulic cylinder; 8. Pressure relay; 9. Electromagnetic reversing valve; 10. Overflow valve; 11, electromagnetic switch valve; 12, piston rod; 13, return spring.

detailed description

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

The specific embodiment of the hydraulic fastening device of the present utility model is shown in Fig. 1 to Fig. 5 . The hydraulic tightening device includes a hydraulic torque wrench and a control system for the hydraulic tightening device. The hydraulic torque wrench includes a rocker arm and a working head connected to the drive of the rocker arm. It also includes a hydraulic cylinder 7. The hydraulic cylinder 7 has a rod chamber and a rodless chamber. It also has a piston rod 12 for pushing the rocker arm of the hydraulic torque wrench to rotate. , There is a return spring 13 for the reset of the piston rod 12 in the rodless chamber. The control system of the hydraulic fastening device includes a hydraulic system and an electrical system.

The schematic diagram of the hydraulic system is shown in Figure 2. The hydraulic system includes a hydraulic pump 4 , a hydraulic cylinder 7 , an oil tank 1 and an electromagnetic reversing valve 9 . The hydraulic pump 4 is an electric hydraulic pump, and the hydraulic pump 4 is driven by the motor 3 . The electromagnetic reversing valve 9 is a two-position four-way electromagnetic reversing valve, and the electromagnetic reversing valve 9 has two working ports, an oil inlet and an oil return port. The two working ports of the electromagnetic reversing valve 9 are respectively connected with the rod chamber and the rodless chamber of the hydraulic cylinder 7 through the oil passage, and the oil inlet of the electromagnetic reversing valve 9 is connected with the hydraulic pump 4 through the oil inlet pipeline. A filter 2 is connected between the hydraulic pump 4 and the oil tank 1 . The oil outlet of the electromagnetic reversing valve 9 is connected with the oil tank 1 through the oil return pipeline. The working port connected to the rod chamber on the electromagnetic reversing valve 9 is connected with the pressure relay 8 for controlling and connecting with the electromagnetic reversing valve 9 on the oil path between the rod chamber. The electromagnetic reversing valve has two positions: when the electromagnetic reversing valve is in the first position, oil enters the rod cavity of the hydraulic cylinder, and the piston rod pushes the rocker to rotate; when the electromagnetic reversing valve is in the second position, the hydraulic cylinder There is rod cavity pressure relief, and piston rod resets under the effect of back-moving spring 13. An electromagnetic switch valve 11, a relief valve 10 and a pressure gauge 5 are connected to the oil inlet pipeline.

The schematic diagram of the electrical system is shown in Figure 3: SB1 in the figure is the stop button; SB2 is the hydraulic pump start button; SB3 is the electromagnetic switch valve control button; SP is the hydraulic pressure relay; is the torque sensor; KM1, KM2 are the contactor coil and its contacts; KM3 is the intermediate relay coil and its contacts; YV1 is the electromagnetic switch valve coil and its contacts; YV2 is the electromagnetic reversing valve coil and its contacts; u1 It is the control circuit voltage; u3 is the power supply voltage of the torque sensor. The pressure relay is a relay with a detection and feedback unit. The pressure relay also has a pressure acquisition module for collecting the oil inlet pressure of the hydraulic cylinder. The pressure acquisition module is connected to the signal of the detection and feedback unit. The relay 8 controls the electromagnetic reversing valve 9 to switch when it is powered on and reset when it is powered off. The working head is provided with a torque sensor 6 for collecting the output torque of the hydraulic fastening device. The intermediate relay is a relay with a detection and feedback unit. The torque sensor 6 is connected to the detection and feedback unit of the intermediate relay 8. The intermediate relay is connected to the switch valve control. When the coil KM3 of the intermediate relay is not energized, the coil YV1 of the electromagnetic switch valve is energized, the electromagnetic switch valve closes the oil return circuit, and opens the circuit for supplying oil to the hydraulic cylinder; the coil KM3 of the intermediate relay is energized to make the intermediate relay The normally closed contact KM3 is disconnected, and then the coil YV1 of the electromagnetic switch valve connected in series with the coil KM3 of the intermediate relay is de-energized, the electromagnetic switch valve is reset, the electromagnetic switch valve opens the oil return circuit, and the pressure of the hydraulic pipeline is zero. Cut off the oil supply to the hydraulic cylinder. In this embodiment, the detection and feedback unit of the pressure relay and the detection and feedback unit of the intermediate relay constitute a controller, respectively controlling the electromagnetic reversing valve through the pressure relay, and controlling the opening and closing of the electromagnetic switching valve through the intermediate relay.

The main circuit diagram of the control system is shown in Figure 4: M in the figure is the motor; KM1 and KM2 are the main contacts of the contactor; R is the fuse; u2 is the main circuit voltage.

The control flow chart of the control system is shown in Figure 5. When the bolts are pre-tightened, the working process of the control system is as follows: first step, press the button SB2, the contactor coil KM2 is energized, the contact coil normally open contact KM2 on the main circuit and the contact coil in the control circuit are normally open The contacts KM2 are all closed; the second step, the motor is started, and the hydraulic pump is energized to run; the third step, at this time, the pressure of the oil inlet pipe of the hydraulic torque wrench (that is, the oil inlet pressure of the hydraulic cylinder) is zero; the fourth step, press the button SB3, the coil YV1 of the electromagnetic switch valve is energized, the electromagnetic switch valve is closed, and it is opened to supply oil to the hydraulic cylinder; step 5, the hydraulic oil enters the rod chamber of the hydraulic cylinder, pushes the piston rod to move, and the pressure of the oil inlet pipe of the hydraulic torque wrench increases The sixth step is to judge whether the pressure of the oil inlet pipe of the hydraulic torque wrench reaches the set value. The seventh step is to connect the pressure relay SP when the pressure of the oil inlet pipe of the hydraulic torque wrench reaches the set value, and the coil YV2 of the electromagnetic reversing valve is energized and Reversing, the electromagnetic reversing valve switches from the first position to the second position; the eighth step, the hydraulic torque wrench oil inlet pipe pressure relief, the hydraulic torque wrench oil inlet pipe pressure drops; the ninth step: the coil YV2 of the electromagnetic reversing valve Power on, the electromagnetic reversing valve resets, and the electromagnetic reversing valve returns to the first station from the second station; the tenth step is to judge the output torque of the hydraulic torque wrench detected by the torque sensor (that is, the output torque of the hydraulic fastening device) Whether it reaches the set value, if it does not reach the set value, repeat the process from the fifth to the eighth step; in the eleventh step, if the torque reaches the set value, the torque sensor outputs a signal; in the twelfth step, the intermediate relay KM3 acts, and the coil When KM3 is energized, the normally closed contact KM3 is disconnected; in the thirteenth step, the coil YV1 of the electromagnetic switch valve is de-energized, the electromagnetic switch valve is reset, and the electromagnetic switch valve cuts off the oil supply to the hydraulic cylinder; in the fourteenth step, the oil inlet pipeline It is connected with the oil tank, and the pressure of the hydraulic pipeline is zero; in the fifteenth step, press the button SB1, and the hydraulic pump stops.

In the utility model, a pressure relay 8 and an electromagnetic reversing valve 9 are added to the oil inlet pipeline of the hydraulic system. When the oil inlet pressure of the hydraulic cylinder 7 reaches the set value P, the switch of the pressure relay 8 is turned on, and the electromagnetic reversing valve 9 coils are powered to start reversing, the oil inlet pipe is relieved, the piston rod 12 returns under the action of the return spring 13, and one working stroke ends. Simultaneously, the pressure switch 8 switch is disconnected because the oil inlet pipe pressure drops, the electromagnetic reversing valve 9 loses power and returns under the effect of the return spring 13, the oil inlet pipe pressure of the hydraulic system rises again, and the next stroke starts again. Repeat this cycle until the driving torque of the hydraulic torque wrench reaches the torque value M set by the torque sensor 6 installed on the drive head, the control signal output by the torque sensor 6 will open the electromagnetic switch valve 11 through the action of the intermediate relay, and the oil inlet pipeline will Relieve the pressure, and the whole working process ends. The entire bolt fastening process does not need to repeatedly press and release the control button to realize the pressurization and unloading of the hydraulic cylinder, which reduces manual repetitive labor and improves work efficiency.

In this embodiment, the pressure acquisition module of the pressure relay constitutes a pressure sensor for collecting the oil inlet pressure of the hydraulic cylinder, while the detection feedback unit of the pressure relay and the detection feedback unit of the intermediate relay constitute a controller. In other embodiments, it can be A pressure sensor is additionally arranged on the oil inlet of the hydraulic cylinder, and the controller can also be a single-chip microcomputer controller or a PLC controller. For example, when the controller is a single-chip controller, the pressure sensor and torque sensor are connected to the signal of the single-chip controller, the electromagnetic reversing valve, the switch valve is connected to the control of the single-chip controller, and the single-chip controller controls the electromagnetic reversing valve according to the signal provided by the pressure sensor: When the oil inlet pressure of the hydraulic cylinder is less than the set value, it is in the first station, and when the oil inlet pressure of the hydraulic cylinder reaches the set value, it is switched from the first station to the second station; the single-chip controller controls according to the signal provided by the torque sensor On-off valve: open to supply oil to the hydraulic cylinder when the torque is less than the set value, and cut off the oil supply to the hydraulic cylinder when the torque reaches the set value.

In the embodiment of the control system of the hydraulic fastening device in the utility model, the structure of the control system of the hydraulic fastening device is the same as the structure of the control system of the hydraulic fastening device in the embodiment of the hydraulic fastening device in the utility model, No more details here.

Claims (7)

1. The control system of the hydraulic fastening device is characterized in that: it includes an electromagnetic reversing valve and a switch valve for connecting to the oil circuit of the hydraulic cylinder of the hydraulic fastening device, a pressure sensor for collecting the oil inlet pressure of the hydraulic cylinder, collecting The torque sensor and the controller of the output torque of the hydraulic fastening device, the pressure sensor and the torque sensor are connected to the controller signal, and the electromagnetic reversing valve and the switching valve are connected to the controller; the electromagnetic reversing valve is connected through its The transposition of the first and second stations switches the direction of entry and exit of the oil circuit to control the piston rod of the hydraulic cylinder to be pressurized to output power or return to the position after pressure relief; the controller controls the electromagnetic reversing valve according to the signal provided by the pressure sensor: It is in the first station when the oil inlet pressure of the hydraulic cylinder is less than the set value, and switches from the first station to the second station when the oil inlet pressure of the hydraulic cylinder reaches the set value; the controller according to the signal provided by the torque sensor Control on-off valve: open to supply oil to the hydraulic cylinder when the torque is less than the set value, and cut off the oil supply to the hydraulic cylinder when the torque reaches the set value. 2. The control system of the hydraulic fastening device according to claim 1, characterized in that: the controller includes a relay with a detection feedback unit, the relay includes a pressure relay and an intermediate relay, and the pressure relay has a function for collecting the hydraulic cylinder. The pressure acquisition module of the oil inlet pressure, the pressure acquisition module constitutes the pressure sensor, the pressure acquisition module of the pressure relay is connected to the detection feedback unit signal of the pressure relay, the torque sensor is connected to the detection feedback unit signal of the intermediate relay, the pressure relay is connected to the electromagnetic converter Directional valve control connection, intermediate relay and switching valve control connection. 3. The control system of the hydraulic fastening device according to claim 1, characterized in that: the electromagnetic reversing valve has two working ports, an oil inlet and an oil return port, and the two working ports of the electromagnetic reversing valve The oil passages are respectively used to connect with the rod chamber and the rodless chamber of the hydraulic cylinder, the oil inlet of the electromagnetic reversing valve is connected with an oil inlet pipeline, and the oil outlet of the electromagnetic reversing valve is connected with an oil return pipeline. 4. Hydraulic tightening device, including hydraulic torque wrench and control system of hydraulic tightening device, hydraulic torque wrench includes rocker arm and working head connected with rocker arm transmission, hydraulic torque wrench also includes hydraulic cylinder, hydraulic cylinder has a rod cavity and a rodless chamber, the hydraulic cylinder has a piston rod used to push the rocker arm to rotate, and it is characterized in that: the control system of the hydraulic fastening device also includes an electromagnetic reversing valve and a switching valve for connecting to the oil circuit of the hydraulic cylinder, collecting The pressure sensor of the oil inlet pressure of the hydraulic cylinder, the torque sensor and the controller for collecting the output torque of the hydraulic fastening device, the pressure sensor and the torque sensor are connected with the controller signal, and the reversing valve, the switching valve and the controller are controlled connection; the reversing valve switches the direction of entry and exit of the oil circuit through the transposition of its first and second stations to control the piston rod of the hydraulic cylinder to be pressurized to output power or return to the position after pressure relief; the controller according to the pressure sensor The provided signal controls the electromagnetic reversing valve: it is in the first position when the oil inlet pressure of the hydraulic cylinder is less than the set value, and switches from the first position to the second position when the oil inlet pressure of the hydraulic cylinder reaches the set value; The above-mentioned controller controls the switch valve according to the signal provided by the torque sensor: when the torque is less than the set value, it opens to supply oil to the hydraulic cylinder, and when the torque reaches the set value, it cuts off the oil supply to the hydraulic cylinder. 5. The hydraulic fastening device according to claim 4, characterized in that: the controller includes a relay with a detection feedback unit, the relay includes a pressure relay and an intermediate relay, and the pressure relay has a function for collecting the oil inlet pressure of the hydraulic cylinder pressure acquisition module, the pressure acquisition module constitutes the pressure sensor, the pressure acquisition module of the pressure relay is connected with the detection feedback unit signal of the pressure relay, the torque sensor is connected with the detection feedback unit signal of the intermediate relay, the pressure relay and the electromagnetic reversing valve control Connection, the intermediate relay is connected with the switch valve control. 6. The hydraulic fastening device according to claim 4, characterized in that: the electromagnetic reversing valve has two working ports, an oil inlet and an oil return port, and the two working ports of the electromagnetic reversing valve pass through the oil circuit They are respectively connected with the rod chamber and the rodless chamber of the hydraulic cylinder, the oil inlet of the electromagnetic reversing valve is connected with an oil inlet pipeline, and the oil outlet of the electromagnetic reversing valve is connected with an oil return pipeline. 7. The hydraulic fastening device according to claim 4, characterized in that: a return spring for restoring the piston rod is provided in the rodless chamber of the hydraulic cylinder.