TWI509379B - Torque control method and apparatus thereof - Google Patents

Description

Torque control method and torque control device thereof 【0001】

The invention relates to a torque control method for a pneumatic torque tool and a control device thereof, in particular to a control relationship between a predetermined pressure and a torque according to a preset operation and control condition for controlling the output torque. A torque control method and a control device thereof.

【0002】

In the use of torsion tools, all torque tools driven by compressed air, such as pneumatic impact wrenches, pneumatic hydraulic pulse wrenches, pneumatic gear-type wrenches, pneumatic clutch-type screwdrivers, etc. During the test or use, the instability of the working pressure affects the results of the test or use. Conventional pneumatic torque tools typically control the torque by adjusting the compressed air pressure or air flow used to drive the pneumatic torque tool. The compressed air used to drive the pneumatic torque tool will be affected by factors such as the air supply capacity of the air compressor system in the workplace and the torque driving mechanism of the tool and the air consumption of the tool, which makes the output torque difficult to control.

[0003]

Traditional impact torque tools are mostly controlled by adjusting the supply pressure and air flow or by controlling the length of the lock time to achieve output torque. However, due to the instability of the working air pressure during the locking process, the amount of air flow entering the tool is directly affected, and the error of the output torque is extremely large. Even when the tool is equipped with a torque sensing device, the vibration frequency and the amplitude caused by the impact make the signal difficult to analyze so that the output torque cannot be effectively controlled.

[0004]

Conventional hydraulic pulse-type torque tools usually use the adjustment of the working air pressure and the hydraulic pressure in the hydraulic cylinder to control the torque of the output. Although the former has better torque control accuracy, but also because of the instability of the working air pressure during the locking process, it directly affects the size of the gas flow into the tool or because the structural characteristics of the hydraulic cylinder and the internal hydraulic oil are in continuous operation. The resulting temperature rise and other factors limit the adjustment range of the torsion and the accuracy of the torque control.

[0005]

The static torque tool is amplifying the torque with a pneumatic motor plus a mechanism such as a planetary gear and a reaction arm. The control precision is high, but because of the long locking time, not only the slow speed, but also the work efficiency is poor, and the heavy tool is easy to cause fatigue for the operator.

[0006]

The clutch type torque tool is a tool that uses a pneumatic motor plus a planetary gear reduction mechanism and then uses the tension of the spring to tighten the clutch to control the torque. The control accuracy is acceptable. However, when the tool is stopped, the output torque of the tool is greater. The greater the reaction force generated, the difficulty it is to hold the tool for a long time, and even the operator is prone to fatigue or cause occupational injuries such as elbow joint disease. Therefore, for a long time, the industry has made great efforts in research and development, hoping to take advantage of the above various tools, and try to add various types of torque sensing and control devices to improve the control accuracy of the output torque.

【0007】

Torque control devices and methods for torsion tools are numerous, usually by pressure (air pressure, oil pressure), flow rate (gas consumption of the tool), deformation caused by the torsion output shaft, angle or electromagnetic induction coil, etc. The device or the torque control of the clutch with the spring tension, and even the length of the locking time, etc., to try various torque control. But it is always difficult to have a significant effect.

[0008]

In summary, most of the torque tools are used to detect the deformation signal of a deformation sensing device (such as a strain gauge or an electromagnetic induction coil) installed at an appropriate position such as the tool output shaft, or to detect the bolt and the surface of the locked component. Angle displacement (using devices such as gyroscopes), with the lock time or the cylinder flow or intake pressure of the tool drive motor to achieve the purpose of twist control. Among them, the impact of the pulse signal generated by the impact of the pneumatic or hydraulic pulse type pneumatic torque tool, coupled with the fast locking speed, the locking process time is extremely short, making the torque difficult to control. In addition, the sensing signals measured by the various electronic sensing devices installed are transmitted to the built-in or external control device of the tool, and the action of instantly cutting off the power of the air source will inevitably encounter electronic components such as microprocessors. When the signal is transmitted between the mechanical control elements such as solenoid valves, the hysteresis of the reaction speed of the mechanism affects the accuracy of the torque control; in addition, the conditions of the joint and the locked member, such as the material and the surface are thick. Degree, soft and hard bonding, surface lubrication and other conditions; even the operator's locking process, the posture of the tool holding, etc., will directly or indirectly affect the accuracy of the torque control.

【0009】

In view of this, the inventors have been engaged in such torque control products for many years, following the previously obtained "torque sensing and control device with anti-vibration function" (US Bulletin No. US7779704), "Controllable "Tracking device and related method for measuring locking torque and locking force" (Chinese invention patent ZL201210011877.1), "Torque control device for power locking tool and its control program" (Taiwan bulletin number I396609) and "impact pneumatic Torque Control Device for Torque Wrench (Taiwan Bulletin No. I432293), to gain a deeper understanding of the operating characteristics of impact tools such as impact type and hydraulic pulse type, and then verified by data from various experiments, the inventor of the present invention designed a torque The control method and its control device are improved to the lack of the prior art, so as to enhance the effective use of the industry, so that the torsion control and the torsion detection of the pneumatic impact and the pulse type torque wrench which have been plagued by the industry for a long time are difficult to overcome. It is easier and more stable to control the desired accuracy range.

[0010]

According to the object of the present invention, a method for controlling the output torque of a pneumatic torque tool is proposed to be applied to various types of pneumatic torque tools, especially an impact type or pulse type pneumatic torque tool, which can not effectively control the output torque problem, and includes the following Step: Connect the pneumatic pipeline from the pneumatic system to the torque control device, according to the characteristics of the tool and the joint to be locked and the preset operating conditions, to output a stable working pressure to the pneumatic torque tool; the pneumatic torque tool can be operated normally. The highest working air pressure value and the lowest working air pressure value respectively drive the pneumatic torque tool. Before the locking operation, the output torque is verified first, and the maximum torque value and the minimum torque value obtained according to the calibration are respectively corresponding to the highest working air pressure. The value and the minimum working pressure value are used to establish a corresponding relationship between the air pressure and the torque; according to the corresponding relationship between the air pressure and the torque, a target torque value between the maximum torque value and the minimum torque value is input to obtain a corresponding working pressure. And use the working air pressure to drive the pneumatic torque tool for locking operation

[0011]

Preferably, the method further comprises the following steps: using the torque sensing device to measure the output torque value of the tool at the highest and lowest working air pressures that can be normally operated before the locking operation, and transmitting to the torque control. And the pneumatic pressure sensor of the torque control device is used to obtain the change of the air pressure during the verification process, and is stored together with the sensed torque value to the memory unit of the torque control device.

[0012]

Preferably, the method further comprises the steps of: using a torque verification tool to verify the torque value of the joint after the locking operation, and inputting to the torque control device; and simultaneously using the pneumatic pressure sensor of the torque control device, The change of the air pressure during the locking process is obtained, and is stored together with the torque value obtained by the verification to one of the memory units of the torque control device.

[0013]

Preferably, the method further comprises the steps of: repeatedly performing a plurality of torque calibration operations to obtain a maximum torque value, a minimum torque value, a maximum working pressure value and a minimum working pressure value of the complex array; respectively accumulating and averaging the complex array The maximum torque value, the minimum torque value, the highest working air pressure value and the minimum working air pressure value, and the air pressure and the corresponding torque value are established according to the averaged maximum working air pressure value and the minimum working air pressure value and the corresponding maximum torque value and minimum torque value. The relationship curve.

[0014]

Preferably, the method further includes the following steps: after inputting the revised torque value, the corresponding relationship between the air pressure and the torque according to the original target torque value is upward or according to the revised torque value being greater than or less than the original target torque value. Downward offset; according to the revised relationship between air pressure and torque, re-enter the target torque value to obtain a new working pressure, and then use this working air pressure to drive the pneumatic torque tool for locking operation, after locking The locking torque is again verified to determine if the desired control range is reached.

[0015]

Preferably, the method further comprises the steps of: monitoring the pressure drop of the air pressure during the locking creping process; and controlling the cutoff of the air source to the pneumatic torque tool when the pressure drop exceeds the allowable variability range, or alerting through the display unit.

[0016]

According to the purpose of the present invention, a torque control device is mainly proposed, which is mainly connected between a pneumatic system and a pneumatic torque tool. The torque control device comprises a pneumatic pressure monitoring module, a pneumatic pressure regulating module, a solenoid valve, a third pneumatic pressure sensor, a memory unit, a display unit, an output input device, a warning device, a power supply device and a microprocessor. The pneumatic pressure monitoring module controls the air pressure from the pneumatic system into the torque control device, or issues a warning signal when the air pressure from the pneumatic system entering the torque control device exceeds the upper limit. The air pressure adjustment module adjusts the air pressure value output to the pneumatic torque tool. The solenoid valve opens or cuts off the air output to the pneumatic torque tool. The third pneumatic pressure sensor is disposed between the electromagnetic valve and the pneumatic torque tool, and senses the change of the air pressure output to the pneumatic torque tool during the locking creping process. The memory unit stores the air pressure value and the torque value obtained by the pneumatic torque tool under the stable air pressure, wherein the air pressure value includes the highest working air pressure value and the lowest working air pressure value, and the torque value includes the maximum torque corresponding to the highest working air pressure value. The value is the minimum torque value corresponding to the lowest working air pressure value. The microprocessor establishes a corresponding relationship between the air pressure and the torque according to the highest working air pressure value and the minimum working air pressure value and the corresponding maximum torque value and the minimum torque value, and according to the relationship curve, the operator inputs a maximum torque value and a minimum value. When the target torque value between the torque values is obtained, a working air pressure corresponding to the target torque value is obtained, thereby driving the pneumatic torque tool to perform the lockable locking operation. The output input device is used for transmission of various torque set values, deformation sensing values, target torque values, and control related signals in the system. The display unit is used to display the air pressure and torque unit, the target torque value and the corresponding working air pressure, the number of locks, and whether the locking operation is OK or NOK. The warning device is alerted by the signal or sound according to the result of microprocessor calculation and judgment. The power supply device electrically connects the various control elements in the torque control device.

[0017]

Wherein, the air pressure adjusting module, if adopting the automatic voltage regulating module, further comprises a pneumatic proportional control valve, a second pneumatic pressure sensor and a pneumatic pressure control valve, and the second pneumatic pressure sensor is interposed between the air pressure Corresponding relationship between the established air pressure and the output torque between the proportional control valve and the pneumatic pressure control valve, according to the maximum working air pressure and the minimum working air pressure built in the microprocessor and the maximum torque value and the minimum torque value respectively obtained by the calibration. When the operator inputs any target torque value therebetween, the microprocessor automatically controls the air pressure proportional control valve to output the air pressure control valve to the solenoid valve pressure according to the air pressure value sensed by the second air pressure sensor. Automatically adjust to the corresponding working pressure to achieve the function of automatic pressure regulation. Wherein, when the pressure regulating module adopts the manual pressure regulating valve, the third pneumatic pressure sensor disposed between the electromagnetic valve and the pneumatic torque tool is used to detect the pressure drop before and after the tool is started, and according to the display. The working pressure corresponding to the target torque value indicated by the unit is adjusted to the corresponding working pressure by a manual pressure regulating valve.

[0018]

Among them, the microprocessor can detect the feedback pressure difference before and after the torque tool is started, and whether the air pressure at the end of the lock is stable within the allowable variation range, etc., and then pass through the display unit or The warning device prompts the operator. In order to ensure that the tool is under a stable working pressure, the locking operation can be controlled correctly.

[0019]

The microprocessor can automatically adjust the corresponding relationship between the originally established air pressure and the torque according to the revised torque value input by the operator according to the torque verification, and input the target torque again according to the corrected relationship between the air pressure and the torque. Value to obtain a new working pressure, and then use this working pressure to drive the pneumatic torque tool for locking work.

[0020]

The torque control method and the torque control device thereof of the present invention utilize an impact type and a hydraulic pulse type torque tool, "with the same tool under a predetermined operating condition, such as; the same tool air flow rate and the same locking Time, and under the steady and full-monitored pressure conditions, the same stable torque will be output. Before the locking operation, the torque sensing device is used to verify and establish the tool. The relationship between the working air pressure and the output torque value under the operating conditions. After the locking operation is performed, it is verified whether the locking torque is within the preset range, and if necessary, the above-mentioned torque correction operation can be implemented, so as to achieve a more precise locking operation with the locking torque, so that the torque can be made. Torque control of the tool eliminates the need to pursue the manufacturing precision of the torque-controlling mechanism of the torque tool itself or to install each sensing device, and it is easy to use the torque control method and the control device thereof. Locking operations for shock-like or pulsed torsion wrenches are more economical, reliable and effective than any known control technology.

[0056]

1‧‧‧Pneumatic system

2‧‧‧Torque control device

21‧‧‧Intake pressure monitoring module

211‧‧‧Pneumatic pressure limiting valve

212‧‧‧First air pressure sensor

22‧‧‧Pneumatic adjustment module

221‧‧‧Automatic voltage regulator module

2211‧‧‧Pressure proportional control valve

2212‧‧‧Second air pressure sensor

2213‧‧‧Pneumatic pressure control valve

222‧‧‧Manual pressure regulator

23‧‧‧ solenoid valve

24‧‧‧ Third Air Pressure Sensor

25‧‧‧Microprocessor

26‧‧‧Output and input module

27‧‧‧Display unit

28‧‧‧ memory unit

29‧‧‧Warning module

20‧‧‧Power Module

3‧‧‧ pneumatic torque tools

4‧‧‧Torque sensing device

T _H ‧‧‧maximum torque value

T _L ‧‧‧minimum torque value

T _H '‧‧‧ adjusted maximum torque value

T _L '‧‧‧ adjusted minimum torque value

T _X ‧‧‧target torque value

T _XI ‧ ‧ revised torque value

P _H ‧‧‧Maximum working pressure value

P _L ‧‧‧ minimum working pressure value

P _X ‧‧‧ working pressure value corresponding to the target torque value

P _XI ‧‧‧ new working air pressure value corresponding to the target torque value after revision

L _S ‧‧‧ Correspondence curve between air pressure and torque

L _M ‧‧‧Corresponding curve of air pressure and torque after adjustment

S11～S14‧‧‧Steps

S41～S45‧‧‧ flow

[0021]

Figure 1 is a diagram showing the steps of the torque control method of the present invention.

Fig. 2 is an experimental diagram showing the relationship between the air pressure and the sensing signal of the torque control method of the present invention.

Fig. 3 is a schematic diagram showing the relationship between the air pressure and the torque of the torque control method of the present invention.

Figure 4 is a block diagram showing an embodiment of the torque control device of the present invention.

Fig. 5 is a schematic view showing the operation of an embodiment of the torque control device of the present invention.

Fig. 6 is a schematic view showing the adjustment of the relationship between the air pressure and the torque of one embodiment of the torque control device of the present invention.

Figure 7 is a block diagram showing another embodiment of the torque control device of the present invention.

[0022]

In order to facilitate the understanding of the technical features, the contents and the advantages of the present invention and the effects thereof, the present invention will be described in detail with reference to the accompanying drawings, The subject matter is only for the purpose of illustration and explanation. It is not necessarily the true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. , first and foremost.

[0023]

Please refer to FIG. 1 , which is a diagram of the implementation steps of the torque control method of the present invention. As shown in the figure, the torque control method of the present invention comprises the following steps: (S11) connecting the pneumatic pipeline from the pneumatic system to the torque control device, according to the characteristics of the tool and the joint to be locked and the preset operating conditions, the output is stable. Working pressure to pneumatic torque tool; (S12) According to the locking process, the pneumatic torque tool can drive the pneumatic torque tool under the stable air supply condition, and the highest working pressure value and the lowest working air pressure value can be driven respectively. Before the calibration operation of the output torque is performed; (S13) the corresponding relationship between the maximum torque value and the minimum torque value and the corresponding maximum working air pressure value and the lowest working air pressure value are established, and the corresponding relationship between the air pressure and the torque is established; (S14) According to the corresponding relationship between the air pressure and the torque, the target torque value between the maximum torque value and the minimum torque value is input to obtain a corresponding working air pressure, and the pneumatic torque tool is driven by the working air pressure to perform the locking operation.

[0024]

That is to say, according to the characteristics of the pneumatic torque tool and the coupling member, the air flow (impact wrench) of the pneumatic torque tool or the hydraulic pressure of the hydraulic cylinder (oil pressure pulse wrench) is selected and applied to the torque control device. Set operation and control conditions, such as; the allowable range of the pressure drop of each pneumatic pressure sensor, the allowable range of the working pressure at the end of the lock, the qualified range of the target torque value, and the differential pressure of the determination tool or the air play The range and the number of seconds required for the locking operation to start. Then, in the range where the working pressure is stable to enable the tool to operate normally, the highest working air pressure value and the lowest working air pressure value are respectively driven, and the pneumatic torque tool is driven to directly lock the joint member to measure the corresponding torque value by the torque sensing device. And automatically transfer the air pressure change data of the locking process to the torque control device for storage; or drive the pneumatic torque tool to perform the calibration work of the output torque capability of the tool before the locking operation by the torque meter. Obtain the corresponding maximum torque value and minimum torque value. After locking, the torque value of the calibration is input to the torque control device by a torque tester such as a digital torque wrench, and the relationship between the originally established air pressure and the torque value is corrected and stored. . The microprocessor of the torque control device can establish a corresponding relationship between the air pressure and the torque according to the highest working air pressure value and the lowest working air pressure value and the corresponding maximum torque value and minimum torque value respectively. Then, any target torque value between the maximum torque value and the minimum torque value can be input through the torque control device. The microprocessor can calculate a working pressure value corresponding to the target torque value according to the corresponding relationship between the air pressure and the torque value, and then adjust the working air pressure by using an automatic or manual pressure regulating method to drive the pneumatic torque tool to perform the actual operation. Locking work. Among them, the corresponding relationship between air pressure and torque is as shown in Figure 3.

[0025]

Hereinafter, the principle of the present invention will be described first.

[0026]

The moment of inertia is also called the Moment of Inertia, which is the inertia of the object to the rotational motion. Comparing linear motion and rotational motion
F = m*a = m*dv/dt (Formula 1) (linear motion)
Τ=Ι*α = Ι*dω/ dt (Formula 2) (rotational motion)
Among them, T: Torque torque (N*m), Ι: moment of inertia or moment of inertia (Kg * m2) (rotary mechanism plus output shaft plus sleeve), V: speed (m/s), α: angular acceleration (rad /s2), ω: angular velocity (rad/s), comparing (Equation 1) with (Equation 2), it can be found that the two are very similar.
v = rω (Equation 3)
I = mr2 (Equation 4)
Τ= rF = rm*dv/dt== mr 2 dω/ dt=Ι*α

[0027]

(Formula 2) is calculated from (Formula 3) and (Formula 4). In the case of an impact-type pneumatic wrench, when the air motor drives the impact mechanism and the hammer block to rotate one turn (or a half turn), the hammer block stops after the output shaft (Anvil) (angular velocity = 0), dω = ω– 0 = ω . After the rotational kinetic energy deducts the heat energy generated during the collision, almost all of it is converted into the knocking kinetic energy. The impact time dt of the impact mechanism striking the output shaft (Anvil) is inversely proportional to the torsion force. In other words, at the same angular velocity, the shorter the collision time, the greater the torque generated. However, depending on the design of the collision time end-view mechanism, the collision time dt can be regarded as a constant under a certain collision force range.

[0028]

Therefore, (式2)Τ=Ι*α = Ι*dω/dt, the torsion is proportional to the angular acceleration α. For the impact wrench, since the impact angular velocity becomes 0, dω = ω– 0 = ω, so The collision time dt is regarded as a constant C, so that (Equation 2): Τ = Ι * α = Ι * dω / dt can be modified to: Τ = m * ω (rpm) * C.

[0029]

In other words, the torsion force of the impact wrench output shaft and the impact mechanism are proportional to the mass m of the hammer block and the rotational speed ω (rpm). In the case of an impact wrench, the mass m of the impact mechanism and the hammer block is a fixed amount. Before the rotational speed ω (rpm) of the impact mechanism and the hammer block driven by the air motor has not reached the maximum speed, the rotational speed ω (rpm) of the mechanism is proportional to the air pressure and the flow rate (air motor). For an electric motor, the rotational speed ω (rpm) of the mechanism is proportional to the voltage (V) and the current (I) is proportional to P = I * V.

[0030]

It can be seen from the above that the output torque of the pneumatic torsion wrench is proportional to the working air pressure, and the torque of the output can be controlled within a target range as long as the working air pressure during the locking process can be stably controlled within an allowable variation range.

[0031]

The so-called torque control of the torque tool can only control the output torque of the torque tool. Due to the different materials and surface conditions of the various joints, it is possible to obtain different locking torque or clamping force by applying the same torque. I would like to explain: (Formula 5) T = K × D × W, where T: Torque, D: the diameter of the screw or bolt (mm), W: the axial force of the screw or bolt (N), K: Torque coefficient. The torque coefficient K is a key parameter, mainly the friction between the thread and the bearing surface. K=K1+K2+K3, where K1 represents the frictional torque coefficient on the bearing surface of the nut or bolt, which is about 50% of the total torque coefficient K; K2 represents the friction coefficient of the contact surface of the thread, about It accounts for 40% of the total torque coefficient K; K3 represents the torsion coefficient generated by stretching the bolt, which accounts for about 10% of the total torque coefficient K value.

[0032]

In view of this, the torque control method of the present invention, in addition to accurately controlling the torque of the output of the torque tool, allows the user to fine-tune the torque during the torque verification according to the different conditions of the used joint to meet the actual needs.

[0033]

Please refer to FIG. 2, which is an experimental diagram of the relationship between the air pressure and the sensing signal of the torque control method of the present invention. The inventors also used a pulsed torsion wrench measured by a NI pulse analyzer (using NI LABVIEW Signal Express software using the hardware, NI cDAQ-9172), with the same locking force at a fixed tool air consumption. The time and the steady and fully monitored atmospheric pressure conditions, such as 85 pounds per square inch (psi), the pulse pattern observed shows that the amplitude of the display has a stable height (1.3m) and can be In order to determine the height of the amplitude of the pressure, which is equivalent to how much torque. The pulse pattern of another stable lower pressure, such as 35 psi, is observed to show the same stable result (650 μm) or, at 85 to 35 pounds per square inch (psi). Within the range, pressures of 55 and 65 pounds per square foot (psi) are also shown to have a stable amplitude (900 μm and 1.05 m). Among them, the Y-axis measures the strain value (Strain Value) on the NI pulse analyzer and can be converted into a torque value. The X-axis is the strike time (the tool is locked at different pressures but the same strike time). In short, under the fixed tool air consumption and stable working pressure, as long as the highest and lowest working pressure of the application tool can be stably controlled within the preset allowable variation range, the corresponding high and low amplitudes are obtained. The height has a very linear relationship between air pressure and torque, as shown in Figure 2, L _S .

[0034]

According to the above theoretical and experimental data, it is proved that the torque applied by a pneumatic torque tool to a joint member (soft joint or hard joint) has a characteristic; that is, with the same pneumatic torque wrench, in a selected tool Under the same air flow rate, with the same locking time and the same stable working pressure, the same output torque value will be obtained for the soft and hard joints. That is to say, the pneumatic torsion wrench, as long as the above-mentioned torque control device is combined, monitors the pressure drop (%) of the working air pressure during the whole process of locking, so that it maintains a stable variation range, and the output torque can be outputted. Control is within a certain target range. Thus, the inventors believe that as long as the working pressure is monitored at a selected tool air flow rate, with the same locking time, and during the entire locking process, the stable maximum and minimum working pressures can be maintained for locking. After solidification, the maximum and minimum output torque values corresponding to the highest and lowest working air pressure values are respectively measured, and the corresponding relationship between the air pressure and the torque close to linear can be established. In the maximum and minimum torque range, a target torque value can be arbitrarily input. The microprocessor of the torque control device of the present invention immediately calculates the corresponding working air pressure according to the corresponding relationship between the built-in air pressure and the torque to drive the tool. The locking operation is performed, and the air source is cut off at a preset time to stop the pneumatic torque tool. In this way, the torque of the output can be controlled within a preset allowable range without worrying about problems between the control or the sensing elements, the reaction delay due to the signal transmission delay, and the control accuracy. However, due to the influence of many factors, such as the gap between the sleeve and the bolt used, the way the tool is held, and the condition of the combination, the torque value obtained by the calibration and the pressure value are not completely linear. . In practical applications, the linear upper and lower offsets can be regarded as the error value of the control, and finally the satisfactory torque control accuracy can still be obtained.

[0035]

Please refer to FIG. 4, which is a block diagram of an embodiment of the torque control device of the present invention. As shown in the figure, the torque control device 2 of the present invention is mainly installed between a pneumatic system 1 and a pneumatic torque tool 3. Torque control device 2 includes

[0036]

The intake pressure monitoring module 21 can be a pneumatic pressure limiting valve 211, which limits the air pressure input by the pneumatic system 1 to a predetermined pressure range (for example, within 100 psi, depending on the withstand voltage of each pneumatic component in the control device) The condition is selected to protect each of the relevant air pressure elements; or a first air pressure sensor 212, when the detection pressure is too large, the solenoid valve 23 can be closed to stop the air supply, and the relevant air pressure can be protected. The component or the warning module 29 is used to issue a warning signal.

[0037]

The air pressure adjusting module 22 can be an automatic pressure regulating module 221 including a pneumatic proportional control valve 2211, a second pneumatic pressure sensor 2212, and a pneumatic pressure control valve 2213. The automatic pressure regulating module 221 automatically passes the built-in working pressure and the corresponding torque value according to the microprocessor 25, and automatically inputs any target torque value T _X between the maximum and minimum torque values when the operator inputs Adjusting the working air pressure to the working air pressure P _X corresponding to the target torque value T _X ; or a manual pressure regulating valve 222, manually adjusted by the operator according to the air pressure indicated by the display unit to correspond to the target torque value T _X 's working pressure P _X .

[0038]

In detail, the function of the air pressure proportional control valve 2211 is to proportionally (proportional) the input voltage (or current) according to the command of the microprocessor 25 and the pressure sensed by the second pneumatic pressure sensor 2212. The intake pressure from the air pressure system 1 is adjusted to increase the pressure outputted by the air pressure control valve 2213 to the electromagnetic valve 23 in a pressurized or pressure-relieving manner, thereby achieving the purpose of automatic pressure regulation.

[0039]

The third pneumatic pressure sensor 24 is disposed between the electromagnetic valve 23 and the pneumatic torque tool 3 to detect whether the air pressure output to the pneumatic torque tool 3 is maintained within a stable air pressure variation range to ensure the operation of the pneumatic torque tool 3. The air pressure is controlled within a preset tolerance range throughout the locking process. By the operation of the above components, a stable and controllable pneumatic input pneumatic torque tool 3 can be obtained, so that the pneumatic torque tool 3 can output a stable and controllable torque.

[0040]

Please refer to FIG. 5, which is a schematic diagram of the operation of one embodiment of the torque control device of the present invention. The related process is as follows:

[0041]

(S41) The relevant operating conditions are preset according to the characteristics of the tool and the combined sleeve and the joint to be locked. Among them, the preset operating conditions, such as the size of the selected gas flow, the time of the lock cresing, the ratio of the maximum working pressure to the pressure of the system air pressure, the ratio of the actual working pressure to the pressure difference when the air is hit, the end of the lock, the actual work The allowable variation range of the air pressure and the determination range of the pass or fail of the target torque value can be flexibly set according to the conditions of the tool, the joint member, and the locked fastener before the lock operation is officially performed.

[0042]

(S42) The maximum torque value is measured on the torque sensing device by driving the pneumatic torque tool 3 at the highest working air pressure. For example, the "TH setting button" of the input/output module 26 (not shown) is pressed. At this time, the microprocessor 25 controls the air pressure adjusting module 22 to automatically adjust the pressure to the highest temperature that can be stably maintained. After the warning module 29 prompts the adjustment, the pneumatic torque tool 3 is driven to perform the torque verification. The processor 25 drives the pneumatic torque tool 3 with the highest working air pressure value P _H . At the same time, the barometric pressure value of the tool is stored together with the sensed torque value to the memory unit 28 as the maximum torque value T _H .

[0043]

(S43) The minimum torque value is measured on the torque sensing device by driving the pneumatic torque tool 3 at the lowest working pressure. For example, the "TL setting button" of the input/output module 26 (not shown) is pressed. At this time, the microprocessor 25 controls the air pressure adjusting module 22 to automatically adjust the pressure to a preset minimum air pressure. After the warning module 29 prompts the adjustment, the pneumatic torque tool 3 is driven to drive the sleeve to perform the torque verification. The device 25 drives the pneumatic torque tool 3 with a minimum working air pressure value P _L . At the same time, the pressure value of the tool creping is stored together with the sensed torque value to the memory unit 28 as the minimum torque value T _L .

[0044]

(S44) Establish a correspondence curve between air pressure and torque. Since the memory unit 28 has stored the aforementioned highest working air pressure value P _H , the lowest working air pressure value P _{L ,} and the maximum torque value T _H corresponding to the highest working air pressure value P _{H and} the minimum torque value T corresponding to the lowest working air pressure value P _{L L} , so the microprocessor 25 can establish a pole-to-linear linear relationship between air pressure and torque.

[0045]

(S45) Enter a target torque value for the actual locking operation. That is, a target torque value T _X between the maximum torque value T _H and the minimum torque value T _L is input, and the microprocessor 25 of the torque control device 2 of the present invention immediately follows the built-in air pressure and torque. Corresponding to the relationship curve, the corresponding working air pressure is calculated, and the corresponding working air pressure is presented to the display unit 27 and the warning module 29, and the operator manually commands the automatic pressure regulating module 221 by the manual pressure regulating valve 222 or the microprocessor 25, the air pressure was adjusted to a value corresponding to the working pressure of the target torque value T _X P _X. As shown in Figure 3. Therefore, the pneumatic torque tool 3 can be activated to perform the locking operation, and the microprocessor 25 can control the solenoid valve 23 to cut off the air source when the preset time is reached, and the tool is stopped to complete the locking operation of the coupling member.

[0046]

It is worth mentioning that in the processes (S42) and (S43), the torque values of the maximum torque value T _H and the minimum torque value T _L can be obtained by the torque sensing device 4. For example, the torsion sensing device 4 can be a commonly used torque verification tool, such as a digital display torque wrench or a torque meter; or a torque sensor built in or externally attached to the output end of the pneumatic torque tool 3, wired or In a wireless manner, the sensing signal is transmitted to the torque control device 2. The above-mentioned processes (S42) and (S43) can be repeated a plurality of times to obtain a plurality of maximum torque values T _H and minimum torque values T _L and their respective maximum working air pressure values P _H and minimum operations. The air pressure value P _L , at which time the microprocessor 25 accumulates and averages the respective values to utilize the averaged maximum torque value T _H , the minimum torque value T _L , the highest working air pressure value P _H and the lowest working air pressure value P _L To establish a corresponding relationship between air pressure and torque, so as to obtain a more accurate relationship between air pressure and torque.

[0047]

Please refer to FIG. 6 , which is a schematic diagram of the adjustment curve of the relationship between the air pressure and the torque of one embodiment of the torque control device of the present invention. The operator can use his or her customary or more reliable torque check tool to verify the torque after locking. The torque value obtained by the calibration can be compared with the target torque value T _X. The "correction key" of group 26 (not shown in the figure), the torque value of the verification is input and stored in the memory unit 28, and the microprocessor 25 will automatically adjust the air pressure and torque according to the revised torque value T _XI . Correspondence curve L _S (the adjusted relationship between air pressure and torque is L _M ), and display the new controllable torque range (between the adjusted maximum and minimum torque values T _H ', T _L ' Torque range). In simple terms, when the input revised torque value T _{XI is} smaller than the target torque value T _X , the corresponding relationship between the air pressure and the torque will be offset downward (as shown in Fig. 6(a)), and when the revised torque value is When T _{XI is} greater than the target torque value T _X , the correlation curve between air pressure and torque will be offset upward (as shown in Figure 6(b)). After the target torque value is re-entered, a new corresponding working pressure P _XI is obtained on the newly revised relationship curve L _M . After the new working air pressure value PXI drives the pneumatic torque tool 3 to lock, it is necessary to check again to determine whether the correct target torque value is obtained.

[0048]

It is worth mentioning that, during the locking process, if the detected air pressure exceeds the preset allowable variation range, the torque control device 2 immediately uses the warning module 29 to issue an alarm or control the electromagnetic valve 23 to cut off the air supply, and the air pressure is restored to The locked air can only be locked in a stable air pressure range. In addition, the allowable range of variation is related to the accuracy of the torque value during actual locking operations. In short, the greater the allowable variation range, the worse the accuracy of the torque control.

[0049]

Please refer to FIG. 7, which is a block diagram of another embodiment of the torque control device of the present invention. As shown in the figure, for practical use or cost considerations, the torque control device 2 of the present invention can eliminate the aforementioned intake pressure monitoring module 21, and set the air pressure adjusting module 22 as a manual pressure regulating valve 222, and only A third pneumatic pressure sensor 24 is disposed between the solenoid valve 23 and the pneumatic torque tool 3. For example, the microprocessor 25 calculates a corresponding working air pressure based on the input target torque value and the built-in air pressure and torque relationship. After being prompted by the display unit 27, the operator manually adjusts the pressure by the manual pressure regulating valve 222 until the adjustment module 29 prompts the operator to lock with the light or sound.

[0050]

In addition, the actual test verifies that the tool is empty or the lock is actually combined. When the pneumatic pressure sensor detects the start and end of the tool, the sensed pressure drop is obvious according to the different gas consumption of each tool. gap. That is to say, the pressure drop at the time of the air strike is larger than the actual one. Accordingly, the microprocessor 25 can sense the start before and after the start of the maximum or minimum torque check, according to the start of the pneumatic torque tool 3 (at this time, the drive sleeve is not locked for the time being locked) until the automatic stop. The pressure difference between the air pressure and the lock before and after the maximum or minimum torque is checked and stored separately. According to this data, it can be determined that the tool is empty or actually locked during the locking process. For correct judgment and statistics.

[0051]

In summary, the inventor of the present invention breaks through the myth of the torque control method by the traditional torsion tool manufacturer. The structure of the tool and the precision of the manufacturing assembly have no absolute influence on the control of the torque. Generally, satisfactory results can not be achieved by adjusting the amount of gas flow through the tool and controlling the time of the strike, or simple pressure control. Especially for impact or pulse type torque tools, even if a torque sensor is installed, it is difficult to detect due to unstable signals generated by pulses. More difficult is that various types of joints and locked components, regardless of material, Hardness, surface roughness, processing conditions of the spiral joint surface, and the relationship between the joint member and the fastener, due to the use of the gasket material, the structure of the joint surface and the order of bolt locking, etc. In terms of the control accuracy of the tightening force or the clamping force, the influence is much greater than the manufacturing quality or accuracy of the tool itself.

[0052]

The most important feature of the invention is that it fully understands the relationship between the pulse signal and the torque of the impact or pulse type torque tool, grasps the technology of the pulse signal acquisition, and eliminates the interference during the telecommunication transmission, and indeed locks each lock before the locking operation. For the characteristics of the joint and the locked fastener used in the solid work, a torque control device is used to first check and establish a relationship between the highest and lowest working air pressures that the tool can operate normally and the maximum and minimum output torque values respectively corresponding to the tool. Then, within the range of the maximum and minimum torque values, any target torque value is input, and the microprocessor prompts the working pressure corresponding to the target torque value to the display unit, and the operator manually controls the pressure valve or automatically by the microprocessor. After the pressure regulating module automatically adjusts the air pressure, the lockable light can be turned on, that is, the lockable locking operation can be performed. Even if the tool used is equipped with a Torque Transducer, the microprocessor only uses the transmitted sensing signal as a parameter for the torque check. In the twisting operation, it is still based on the relationship between the pre-established working air pressure and the corresponding output torque value, and how much working air pressure is required to drive the tool by the known target torque value, and the whole process is started during the locking operation. The purpose of the torque control can be achieved by monitoring the pressure drop of the air pressure and the air pressure at the end of the lock according to the preset operation and control conditions. In practice, the torque sensor is only used for verification before the official locking operation. It is not recommended that the locking operation be carried out, plug-in or built-in tools, not only can effectively extend the service life of the torque sensor (Torque Transducer), but also greatly reduce the expensive maintenance cost of the electronic control components. In addition, the use of expensive additional torque sensor tools eliminates the need for an impactor or pulsed torque tool that does not effectively control the output torque.

[0053]

The method for torque control and the torque control system thereof provided by the invention can achieve precise torque control under the condition of using the technical features defined by the invention. The torque control method and the torque control device thereof of the present invention emphasize that, under the condition of maintaining a stable working air pressure for a continuous period of locking, the highest and lowest working air pressures and corresponding maximums that can be normally operated by the tool are obtained through pre-verification. Within the relationship with the minimum output torque value, the required target torque value can be arbitrarily input, and the microprocessor can prompt the corresponding working air pressure, and then adjust to the correct air pressure by manual or automatic pressure regulation, and then drive the tool to lock. The control accuracy of the output torque can be adjusted according to the required accuracy, and the user can correct the relationship between the air pressure and the torque according to the actual torque value measured by the calibration. Curve for locking work with twist control.

[0054]

The method of torque control of the present invention and the torque control device thereof, as applied to the torque detecting device, also greatly solve the controversy of the test result. In the traditional torsion test equipment, there is no connection between the air supply line and the torque meter of the pneumatic torque tool during the test, that is, the torque meter is a traditional oil pressure type, and the oil pressure gauge is displayed on the oil pressure gauge. The tester reads the torque value according to the comparison table of the oil pressure and the torque; if the digital torque meter is equipped with the torque sensing component, it is only electrically connected with a display to display the measured torque value. However, often the tools under test, due to the instability of the air supply system, directly affect the test results of the tool output torque. The torque control system of the present invention can easily solve this problem. The tool air source to be tested is passed through the torque control device of the present invention, and during the test creping process, the change of the air pressure is monitored throughout the entire preset test condition range. Through this device, the squeezing pressure signal of the air pressure sensor and the torque signal of the torque sensing component deformation can be simultaneously taken. Make the test results appear correctly and avoid disputes.

[0055]

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

Domestic registration information [please note according to the registration authority, date, number order]

no

Foreign deposit information [please note according to the country, organization, date, number order]

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no

S11~S14‧‧‧Steps

Claims (10)

[Item 1] A torque control method for applying a locking operation of a pneumatic torque tool, comprising the following steps:
The pneumatic system is connected to the pneumatic pipeline to a torque control device, according to the characteristics of the tool and the joint to be locked and the preset operating conditions, to output a stable working pressure to the pneumatic torque tool;
The pneumatic torque tool is driven according to a maximum working air pressure value and a minimum working air pressure value that can be normally operated by the pneumatic torque tool, and the output torque is verified before the locking;
Establishing a corresponding relationship between the air pressure and the torque according to the maximum torque value and the minimum torque value respectively obtained and the corresponding maximum working air pressure value and the minimum working air pressure value; and the corresponding relationship curve between the air pressure and the torque Entering a target torque value between the maximum torque value and the minimum torque value to obtain a corresponding working air pressure value, and driving the pneumatic torque tool to perform the locking operation at the working pressure value for locking operation During the creping process, the working air pressure is controlled within a preset allowable variation range to achieve the purpose of controlling the torque. [Item 2] The torque control method according to claim 1, wherein the outputting torque verification operation further comprises the following steps:
The pneumatic torque tool drives a torque sensing device, and the torque control device senses the pressure signal sensed by the air pressure sensor and the torque sensing device during the locking operation of the calibration operation device. The torque signal is stored together with a memory unit of the torque control device for establishing a corresponding relationship between the air pressure and the torque of the pneumatic torque tool under normal operation. [Item 3] For example, the torque control method described in claim 1 further includes the following steps:
After the pneumatic torque tool directly locks the joint member, a torque check tool is used to obtain the locked or loose torque value, and the torque value is input to the torque control device; and together with the lock operation During the creping process, the change in air pressure drawn by a pneumatic pressure sensor in the torque control device is stored together with a memory unit of the torque control device for establishing the pneumatic torque tool under normal operation. Correspondence curve between air pressure and torque. [Item 4] The torque control method according to claim 2 or 3, further comprising the following steps:
The verification operation of the plurality of output torques may be repeated to obtain the maximum torque value and the minimum torque value corresponding to the maximum working air pressure value of the complex array and the minimum working air pressure value; and accumulating and averaging the The maximum torque value, the minimum torque value, the highest working air pressure value, and the lowest working air pressure value of the complex array, based on the averaged maximum torque value, the minimum torque value, the highest working air pressure value, and the lowest working pressure The value establishes the corresponding relationship between the air pressure and the torque. [Item 5] For example, the torque control method described in claim 1 further includes the following steps:
Enter a revised torque value;
Adjusting the corresponding relationship between the air pressure and the torque according to the revised torque value, and simultaneously displaying the adjusted controllable torque range; and, when re-entering the target torque value, according to the adjusted relationship between the torque and the working pressure, The adjusted working pressure value corresponding to the target torque value is obtained, and the pneumatic torque tool is driven to perform the locking operation. [Item 6] For example, the torque control method described in claim 1 of the patent application further includes the following steps:
During the process of locking or torsion verification, the whole process monitors the change of the pneumatic pressure of the tool; and when the pressure drop exceeds the allowable variation range, an alert is issued via a warning device, or the output is cut off to the pneumatic torque tool. Gas source. [Item 7] A torque control device is connected between a pneumatic air supply system and a pneumatic torque tool, and includes:
An intake pressure monitoring module, which can optionally be provided with a pneumatic pressure limiting valve or a first pneumatic pressure sensor, and when installed as the pneumatic pressure limiting valve, controls the self-pressure system to enter the torque control device Air pressure, when installed as the first air pressure sensor, when the intake air exceeds the upper pressure limit of the torque control device, an alert is provided to protect each relevant air pressure component and the pneumatic torque tool in the torque control device ;
a pressure regulating module, which can optionally be equipped with an automatic pressure regulating module or a manual pressure regulating valve to adjust the pressure value outputted to one of the pneumatic torque tools;
a solenoid valve that opens or cuts off the air pressure output to the pneumatic torque tool;
a third pneumatic pressure sensor is disposed between the electromagnetic valve and the pneumatic torque tool to sense the output air pressure during the locking creping process;
A memory unit stores the pneumatic torque tool in a stable working air pressure range capable of maintaining a normal locking operation, respectively obtaining a maximum torque value and a minimum corresponding to a maximum working air pressure value and a minimum working air pressure value respectively. Torque value and preset operating conditions, wherein the preset operating conditions are the air flow of the tool, the hydraulic cylinder pressure of the hydraulic pulse tool, the number of seconds of the lock cresing, and the maximum working pressure value compared to the pressure of the pneumatic system. The ratio of the pressure drop, the ratio of the actual working air pressure to the air pressure difference, the allowable variation range of the actual working air pressure at the end of the locking, and the determination range of the target torque value; and a microprocessor based on the pneumatic torque Before the tool performs the formal locking operation, the highest working air pressure value, the minimum working air pressure value, the maximum torque value and the minimum torque value of the same specification and type of the binding member and the locked firmware are used to establish a pressure. The corresponding curve with the torque, which is input within the range of the maximum torque value and the minimum torque value when the locking operation is officially performed The target torque value is obtained on the corresponding relationship between the air pressure and the torque, and the corresponding working pressure value is obtained; after the air pressure adjusting module adjusts the air pressure, the pneumatic torque tool is driven according to the working air pressure value, and preset The operating condition monitors the change of air pressure throughout the locking operation, and promptly displays or warns the working condition. After the set locking time is reached, the intake air source is cut through the electromagnetic valve to complete the lock capable of controlling the torque. Tight work. [Item 8] The torque control device of claim 7, wherein the automatic pressure regulating module of the air pressure adjusting module further comprises a second pneumatic pressure sensor, wherein the second pneumatic pressure sensor is disposed on Between the air pressure proportional control valve and the one air pressure control valve, the sensed air pressure value is immediately provided to the microprocessor, and when the operator inputs the target torque value, the air pressure is commanded according to the calculated working air pressure value. The proportional control valve adjusts the output pressure of the pneumatic pressure control valve to the working pressure value for the purpose of automatic pressure regulation. [Item 9] The torque control device according to claim 7, wherein when the air pressure adjusting module is the manual pressure regulating valve, when the operator inputs the target torque value, the corresponding work is prompted according to the display unit. The air pressure value is manually adjusted to the working air pressure value, and the state is ready for the lock over-solid operation. [Item 10] The torque control device of claim 7, wherein the microprocessor corrects and adjusts the corresponding relationship between the air pressure and the torque according to the input revised torque value, and when the operator re-enters the target torque value, According to the adjusted corresponding relationship between the air pressure and the torque, the new corresponding working air pressure value is prompted, and the pneumatic torque tool is driven by the working air pressure value to perform the locking operation.